CN102983762B - Power supply of electrical equipment - Google Patents
Power supply of electrical equipment Download PDFInfo
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- CN102983762B CN102983762B CN201210548507.1A CN201210548507A CN102983762B CN 102983762 B CN102983762 B CN 102983762B CN 201210548507 A CN201210548507 A CN 201210548507A CN 102983762 B CN102983762 B CN 102983762B
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Abstract
The invention discloses a power supply of electrical equipment, which comprises an alternating current input circuit, an electromagnetic interference filter circuit, a boosting rectification filter circuit, a direct current chopping pulse width modulation circuit, a transformer circuit, a synchronous rectification filter circuit, and a two-way direct current voltage stabilization output circuit, wherein the alternating current input circuit is connected with an external alternating current power supply; the electromagnetic interference filter circuit is connected with the alternating current input circuit; the boosting rectification filter circuit is connected with the electromagnetic interference filter circuit; the direct current chopping pulse width modulation circuit is connected with the boosting rectification filter circuit; the transformer circuit is connected with the direct current chopping pulse width modulation circuit; the synchronous rectification filter circuit is connected with the transformer circuit; and the two-way direct current voltage stabilization output circuit is connected with the synchronous rectification filter circuit. According to the power supply of the electrical equipment, as the two-way direct current voltage stabilization output circuit is adopted, output voltage is not affected by load easily, the stability and reliability are higher, the rectification efficiency can be improved with the adoption of the synchronous rectification circuit, the greater power output can be supported, the power can be stably supplied for various loads, and the normal operation of loads such as the electrical equipment can be ensured.
Description
Technical field
The present invention relates to power technique fields, particularly relate to a kind of electric equipment power supply.
Background technology
In recent years, along with the raising day by day of people's living standard, the domestic electric appliances such as television set, video camera, camera are more and more universal in people's daily life and life, and various electric equipment has become people and to have lived indispensable part.
For various electric equipment, usually need to be connected with power supply, for current power circuit, usually adopt secondary side feedback adjustable type SSR circuit structure and former limit feedback regulation formula PSR circuit structure.
Wherein, for secondary side feedback adjustable type SSR circuit structure, it needs to adopt more electronic unit, production cost is higher, and Electro Magnetic Compatibility is bad, need the complicated electromagnetic interference EMI filter circuit of design to carry out supporting filtering, therefore the market competitiveness is poor, has influence on extensively popularizing commercially.
And for former limit feedback regulation formula PSR circuit structure, there is the more weak problem of load capacity in it, be only applicable to the small-power type voltage-stabilized power supply circuit of below 10W at present, and the less stable of output voltage, easily there is marked change along with load variations in output voltage, has had a strong impact on the serviceability of power supply.
Therefore, at present in the urgent need to developing a kind of electric equipment power supply, its output voltage is not easy the impact being subject to load, have higher stability and reliability, and support that relatively high power exports, only need to have to adopt less electronic unit, therefore, production cost is lower, and Electro Magnetic Compatibility is good, be conducive to for various load provides stable power-supplying, ensure the normal operation of electric equipment even load.
Summary of the invention
In view of this, the object of this invention is to provide a kind of electric equipment power supply, its output voltage is not easy the impact being subject to load, have higher stability and reliability, and support that relatively high power exports, only need to have to adopt less electronic unit, therefore, production cost is lower, Electro Magnetic Compatibility is good, be conducive to for various load provides stable power-supplying, ensure the normal operation of electric equipment even load, be of great practical significance.
For this reason, the invention provides a kind of electric equipment power supply, it is characterized in that, comprising:
Ac input circuit, is connected with external ac power source, receives the alternating voltage that external ac power source exports, then exports to electromagnetic interference filter circuit;
Electromagnetic interference filter circuit, is connected with ac input circuit, for the alternating voltage filtering electromagnetic interference exported ac input circuit, is specially conducted interference and the radiated interference of filtering electromagnetic interference, then exports to boosting current rectifying and wave filtering circuit;
Boosting current rectifying and wave filtering circuit, be connected with electromagnetic interference filter circuit, the alternating voltage for exporting electromagnetic interference filter circuit boosts and rectification, forms direct voltage, then exports to DC chopped-wave pulse-width modulation circuit after the filtering;
DC chopped-wave pulse-width modulation circuit, is connected with boosting current rectifying and wave filtering circuit, carries out pulse width modulation, form the direct voltage of predeterminated frequency scope, then export to transformer for the direct voltage exported by boosting current rectifying and wave filtering circuit;
Transforming circuit, is connected with DC chopped-wave pulse-width modulation circuit, carries out step-down process, then export to synchronous rectification filter circuit for the direct voltage exported DC chopped-wave pulse-width modulation circuit;
Synchronous rectification filter circuit, is connected with transforming circuit, carries out synchronous filtering, then export to two-way direct current voltage stabilization output for the direct voltage exported transforming circuit;
Two-way direct current voltage stabilization output, is connected with synchronous rectification filter circuit, for after the road direct voltage receiving the output of synchronous rectification filter circuit, is converted to two-way pre-set constant voltage, then exports to the electric equipment of outside need electricity consumption.
Wherein, described ac input circuit includes the first voltage input end Vin1; a described first voltage input end Vin1 and piezo-resistance VA1 is in parallel, and the line between described first voltage input end Vin1 and piezo-resistance VA1 has an over-current protection device.
Wherein, described over-current protection device is fuse.
Wherein, described electromagnetic interference filter circuit comprises a filter LF1, the first voltage input end Vin1 in the input A1 of described filter LF1 and described ac input circuit is in parallel, and the input A1 of described filter LF1 is also in parallel with an electric capacity C1, the series arm that is made up of resistance R100, resistance R200 and resistance R300 respectively;
An output B1 and electric capacity C2 of described filter LF1 is in parallel.
Wherein, described boosting current rectifying and wave filtering circuit comprises a rectifier bridge DB1, the output B1 of described rectifier bridge DB1 and described electromagnetic interference filter circuit median filter LF1 is in parallel, described rectifier bridge DB1 is connected with the first voltage output end Vout1, and described first voltage output end Vout1 is also by electrochemical capacitor C100 ground connection.
Wherein, described DC chopped-wave pulse-width modulation circuit comprises the first integrated circuit (IC) 1, and described first integrated circuit (IC) 1 comprises stitch 1 ~ 7;
In described first integrated circuit (IC) 1, described stitch 1 connects with resistance R5, electric capacity C6 respectively, and described resistance R5 passes through resistance R6 ground connection, described electric capacity C6 ground connection;
Connecting resistance R11 and resistance R12, described resistance R12 are by resistance R13 ground connection respectively for described stitch 2, and described resistance R11 is connected with tertiary voltage output end vo ut3 by resistance R10;
Described stitch 3 is connecting resistance R4 and electric capacity C5 respectively, described electric capacity C5 ground connection, and described resistance R4 is by electric capacity C4 ground connection;
Described stitch 4 is connecting resistance R9 and electric capacity C7 respectively, described electric capacity C7 ground connection, described resistance R9 is connecting resistance R8 and resistance R7 successively, described resistance R7 connects with the negative pole of diode D2, the positive pole of described diode D2 connects with one end of tertiary voltage output end vo ut3, the other end ground connection of described tertiary voltage output end vo ut3;
Described stitch 5 ground connection, described stitch 6 is vacant;
Described stitch 7 connects the positive pole of diode D1 and one end of the second voltage output end Vout2 respectively, the negative pole connecting resistance R3 and electric capacity C3 respectively of described diode D1, described resistance R3 is connected with the second voltage input end Vin2 by resistance R2, described second voltage input end Vin2 is connected with the first voltage output end Vout1, and described second voltage input end Vin2 connects with the other end of electric capacity C3, the second voltage output end Vout2 respectively.
Wherein, described transforming circuit comprises an isolating transformer TM1, the primary voltage input L1 of described isolating transformer TM1 connects with the second voltage output end Vout2, and the primary voltage input L2 of described isolating transformer TM1 connects with tertiary voltage output end vo ut3;
The earth terminal of described isolating transformer TM1 secondary voltage output L3 is connected by an electric capacity C200 with the earth terminal of primary voltage input L1.
Wherein, described synchronous rectification filter circuit includes the second integrated circuit (IC) 2, and described second integrated circuit (IC) 2 comprises stitch 1 ~ 8;
In described second integrated circuit (IC) 2, described stitch 1,2,4,7 ground connection, the grid G of described stitch 3 connecting resistance R22 and power field effect pipe MOSFET Q successively, the drain D of described power field effect pipe MOSFET Q meets the other end, the resistance R23 and electric capacity C20 of described isolating transformer TM1 secondary voltage output L3 respectively, described electric capacity C20 is connecting resistance R20 and resistance R21, described resistance R20 and resistance R21 ground connection respectively; The source S of described power field effect pipe MOSFET Q connects with resistance R20 and resistance R21 respectively;
Described stitch 5 is connecting resistance R23 and resistance R24 respectively, described resistance R24 ground connection;
Described stitch 6 is connecting resistance R25 and resistance R26 respectively, described resistance R26 ground connection;
Described stitch 8 meets inductance L 10, electrochemical capacitor C22, resistance R25 and electric capacity C21 respectively, described electric capacity C21 ground connection, described electrochemical capacitor C22 ground connection, described inductance L 10 connects with the 4th voltage output end Vout4 of described synchronous rectification filter circuit, and described 4th voltage output end Vout4 is by an electrochemical capacitor C23 ground connection.
Wherein, described two-way direct current voltage stabilization output comprises the 3rd integrated circuit (IC) 3, and described 3rd integrated circuit (IC) 3 comprises stitch 1 ~ 8;
In described 3rd integrated circuit (IC) 3, described stitch 1 meets inductance L 20, resistance R250 respectively, and described inductance L 20 is connected with the 5th voltage output end Vout5;
Described stitch 2 is connected with resistance R250 by electric capacity C102;
Described stitch 3 is connecting resistance R260 and resistance R270 respectively, and described resistance R260 connects with tertiary voltage input Vin3, described resistance R270 ground connection;
Described stitch 4 meets electric capacity C101, electric capacity C30 respectively, electric capacity C8, electric capacity C9 and tertiary voltage input Vin3, described tertiary voltage input Vin3 connects with the 4th voltage output end Vout4, described electric capacity C101 is by an electric capacity C201 ground connection, described electric capacity C30 passes through an electric capacity C40 ground connection, described electric capacity C8 and C9 ground connection;
Described stitch 5 ground connection, described stitch 6 respectively connecting resistance R230 and resistance R240, described resistance R230 is connected with the 6th voltage output end Vout6 with after electric capacity C220 parallel connection, described resistance R240 ground connection;
Described stitch 7 connects with inductance L 30, and described inductance L 30 connects with the node between described resistance R230 and the 6th voltage output end Vout6;
Described stitch 8 meets the 5th voltage output end Vout5, electric capacity C16 and electric capacity C17 respectively, and described electric capacity C16 and electric capacity C17 is ground connection respectively.
Wherein, described 5th voltage output end Vout5 connects with electric capacity C14, electric capacity C15 respectively, and described electric capacity C14 and electric capacity C15 is ground connection respectively;
Described 6th voltage output end Vout6 connects with electric capacity C24, electric capacity C25 respectively, and described electric capacity C24 and electric capacity C25 is ground connection respectively.
From above technical scheme provided by the invention, compared with prior art, the invention provides a kind of electric equipment power supply, it is owing to have employed two-way direct current voltage stabilization output, therefore output voltage is not easy the impact being subject to load, have higher stability and reliability, and by adopting circuit of synchronous rectification, rectification efficiency can be improved, thus support that relatively high power exports, be conducive to for various load provides stable power-supplying, ensure the normal operation of electric equipment even load, be of great practical significance.
In addition, for electric equipment power supply provided by the invention, adopt less electronic unit because its needs have, therefore, production cost is lower, and Electro Magnetic Compatibility is good, is conducive to producing widely universal.
Accompanying drawing explanation
Fig. 1 is the block diagram of a kind of electric equipment power supply provided by the invention;
Fig. 2 is the connecting circuit figure of ac input circuit, electromagnetic interference filter circuit and boosting current rectifying and wave filtering circuit in a kind of electric equipment power supply provided by the invention;
Fig. 3 is the circuit diagram of DC chopped-wave pulse-width modulation circuit in a kind of electric equipment power supply provided by the invention;
Fig. 4 is the connecting circuit figure of transforming circuit and synchronous rectification filter circuit in a kind of electric equipment power supply provided by the invention;
Fig. 5 is the circuit diagram of two-way direct current voltage stabilization output in a kind of electric equipment power supply provided by the invention.
Embodiment
In order to make those skilled in the art person understand the present invention program better, below in conjunction with drawings and embodiments, the present invention is described in further detail.
See Fig. 1, the invention provides a kind of electric equipment power supply, comprise ac input circuit 101, electromagnetic interference filter circuit 102, boosting current rectifying and wave filtering circuit 103, DC chopped-wave pulse-width modulation circuit 104, transforming circuit 105, synchronous rectification filter circuit 106 and two-way direct current voltage stabilization output 107, wherein:
Ac input circuit 101, is connected with external ac power source, receives the alternating voltage that external ac power source exports, then exports to electromagnetic interference filter circuit 102;
Electromagnetic interference filter circuit 102, be connected with ac input circuit 101, for the alternating voltage filtering electromagnetic interference exported ac input circuit 101, be specially conducted interference and the radiated interference of filtering electromagnetic interference, then export to boosting current rectifying and wave filtering circuit 103;
Boosting current rectifying and wave filtering circuit 103, is connected with electromagnetic interference filter circuit 102, boosts and rectification for the alternating voltage exported electromagnetic interference filter circuit 102, forms direct voltage, then exports to DC chopped-wave pulse-width modulation circuit 104 after the filtering;
DC chopped-wave pulse-width modulation circuit 104, is connected with boosting current rectifying and wave filtering circuit 103, carries out pulse width modulation, form the direct voltage of predeterminated frequency scope, then export to transformer 105 for the direct voltage exported by boosting current rectifying and wave filtering circuit 103;
Transforming circuit 105, is connected with DC chopped-wave pulse-width modulation circuit 104, carries out step-down process, then export to synchronous rectification filter circuit 106 for the direct voltage exported DC chopped-wave pulse-width modulation circuit 104;
Synchronous rectification filter circuit 106, is connected with transforming circuit 105, carries out synchronous filtering, then export to two-way direct current voltage stabilization output 107 for the direct voltage exported transforming circuit 105;
Two-way direct current voltage stabilization output 107, be connected with synchronous rectification filter circuit 106, for after the road direct voltage receiving synchronous rectification filter circuit 106 output, be converted to two-way pre-set constant voltage, then export to the electric equipment of outside need electricity consumption.
In order to have a clear understanding of each circuit of the invention described above, the following describes the concrete structure of each circuit.
See Fig. 2, in the present invention, described ac input circuit 101 includes the first voltage input end Vin1(specifically can show as a power supply terminal), a described first voltage input end Vin1 and piezo-resistance VA1 is in parallel, and the line between described first voltage input end Vin1 and piezo-resistance VA1 has a fuse F1.
It should be noted that; described piezo-resistance VA1 is lightning discharge protective device, English name Varistor, is made up of the diode of two docking; its effect is subject to the electric discharge of thunderbolt transient switching, to reach the object of protection backend load at the first voltage input end Vin1.
In the present invention, the first voltage input end Vin1 for inputting outside alternating voltage, such as can size be 85V ~ 265V, frequency is the alternating voltage of 47Hz ~ 63Hz.
In the present invention, what described fuse F1 played in circuit act as overcurrent protection effect, and in specific implementation, fuse can also be replaced by other over-current protection device.
In the present invention, the two ends of described first voltage input end Vin1 are fixed with rivet EY1, rivet EY2 respectively, and described rivet EY1, rivet EY2 for fixed weight or the larger components and parts of volume, increase the firm welding of component on circuit boards.
For electromagnetic interference filter circuit 102, it should be noted that, the conducted interference of electromagnetic interference to refer to by conducting medium the signal coupling (interference) on an electric network to another electric network.Radiated interference refer to interference source by space its signal coupling (interference) to another electric network.In high speed integrated circuit plate PCB, the pin of high-frequency signal line, integrated circuit, all kinds of connectors etc. all may become the radiated interference source with antenna performance, can emitting electromagnetic wave affect the normal work of other subsystems in other system or native system.
See Fig. 2, in the present invention, described electromagnetic interference filter circuit 102 comprises a filter LF1, the first voltage input end Vin1 in the input A1 of described filter LF1 and described ac input circuit 101 is in parallel, and the input A1 of described filter LF1 is also in parallel with an electric capacity C1, the series arm that is made up of resistance R100, resistance R200 and resistance R300 respectively;
An output B1 and electric capacity C2 of described filter LF1 is in parallel.
In the present invention, in specific implementation, boosting current rectifying and wave filtering circuit 103 can just sine wave AC voltage convert same frequency to, the direct voltage with regulation ripple.
See Fig. 2, in the present invention, described boosting current rectifying and wave filtering circuit 103 comprises a rectifier bridge DB1, the output B1 of described rectifier bridge DB1 and described electromagnetic interference filter circuit 102 median filter LF1 is in parallel, described rectifier bridge DB1 is connected with the first voltage output end Vout1, and described first voltage output end Vout1 is also by electrochemical capacitor C100 ground connection.
In the present invention, be also fixed with rivet EY3, rivet EY4 in described boosting current rectifying and wave filtering circuit 103, described rivet EY3, rivet EY4 for fixed weight or the larger components and parts of volume, increase the firm welding of component on circuit boards.
It should be noted that, for DC chopped-wave pulse-width modulation circuit 104, direct voltage conversion can be carried out and namely use as dc-dc, simultaneously, can pulse width modulation (PWM) be carried out, be exactly control wave one-period in, high level time accounts for the ratio (duty ratio) in whole cycle.
See Fig. 3, in the present invention, described DC chopped-wave pulse-width modulation circuit 104 comprises the first integrated circuit (IC) 1, and described first integrated circuit (IC) 1 comprises stitch 1 ~ 7;
Wherein, described stitch 1 connects with resistance R5, electric capacity C6 respectively, and described resistance R5 passes through resistance R6 ground connection, described electric capacity C6 ground connection;
Connecting resistance R11 and resistance R12, described resistance R12 are by resistance R13 ground connection respectively for described stitch 2, and described resistance R11 is connected with tertiary voltage output end vo ut3 by resistance R10;
Described stitch 3 is connecting resistance R4 and electric capacity C5 respectively, described electric capacity C5 ground connection, and described resistance R4 is by electric capacity C4 ground connection;
Described stitch 4 is connecting resistance R9 and electric capacity C7 respectively, described electric capacity C7 ground connection, described resistance R9 is connecting resistance R8 and resistance R7 successively, described resistance R7 connects with the negative pole of diode D2, the positive pole of described diode D2 connects with one end of tertiary voltage output end vo ut3, the other end ground connection of described tertiary voltage output end vo ut3;
Described stitch 5 ground connection, described stitch 6 is vacant;
Described stitch 7 connects the positive pole of diode D1 and one end of the second voltage output end Vout2 respectively, the negative pole connecting resistance R3 and electric capacity C3 respectively of described diode D1, described resistance R3 is connected with the second voltage input end Vin2 by resistance R2, described second voltage input end Vin2 is connected with the first voltage output end Vout1, and described second voltage input end Vin2 connects with the other end of electric capacity C3, the second voltage output end Vout2 respectively.
It should be noted that, in described first integrated circuit (IC) 1, described stitch 1 is control terminal PD(Program Pin), this terminal has double action, and one is the current limit for integrated circuit (IC) 1, and two is postpone its turn-off time when IC1 turns off;
Described stitch 2 is feedback terminal FB(Feedback Pin), for detecting output voltage change.This terminal is connected in elementary auxiliary winding L 2 by sampling resistor R10, R11, R12, R13.According to induced electromotive force principle, when secondary output voltage changes, the rate of change of secondary voltage should become transformer turn ratio relation with the voltage change ratio in elementary auxiliary winding L 2.Therefore namely FB pin detects the change on auxiliary winding limit L2 is the change detecting secondary output voltage;
Described stitch 3 compensates terminal CP(Compensation pin), the external RC circuit be made up of R4, C4, C5 of this terminal, forms a control loop compensating network;
Described stitch 4 starts terminal BP(Bypass pin), this connecting terminals is connected to elementary auxiliary winding L 2 for integrated circuit (IC) 1 provides starting resistor.This terminal also external shunt capacitance C7 simultaneously, is used for selecting the starting state of integrated circuit (IC) 1 after running into fault.Auto-restart can be arranged reset automatically or Latch lock-out state;
Stitch 5 is source terminal S(Source pin), i.e. the source S of built-in switch pipe MOSFET;
Stitch 6 is vacant terminal NC(NC pin), for increasing the insulation clearance between stitch 5 and stitch 7, prevent electrion;
Stitch 7 is drain terminal D(Drain pin), i.e. the drain D of built-in switch pipe MOSFET.
In the present invention, see Fig. 4, described transforming circuit 105 can comprise an isolating transformer TM1, and described isolating transformer TM1 is the transformer of electric insulation between former secondary coiling.
See Fig. 4, described transforming circuit comprises an isolating transformer TM1, the primary voltage input L1 of described isolating transformer TM1 connects with the second voltage output end Vout2, and the primary voltage input L2 of described isolating transformer TM1 connects with tertiary voltage output end vo ut3;
The earth terminal of described isolating transformer TM1 secondary voltage output L3 is connected by an electric capacity C200 with the earth terminal of primary voltage input L1.
In the present invention, it should be noted that, described synchronous rectification filter circuit 106 adopts the power MOSFET that on state resistance is extremely low, replaces existing rectifier diode, to reduce the technology of rectifier loss.It can improve the efficiency of DC chopped-wave pulse-width modulation circuit 104 greatly, and there is not the dead zone voltage caused by Schottky barrier voltage.Power MOSFET belongs to voltage-controlled device, and its voltage-current characteristic when conducting is linear.When making rectifier with power MOSFET, require that the voltage-phase of grid G must keep synchronous with the phase place of the voltage be rectified and just can complete rectification function, therefore be referred to as synchronous rectification.
See Fig. 4, for described synchronous rectification filter circuit 106, it includes the second integrated circuit (IC) 2, and described second integrated circuit (IC) 2 comprises stitch 1 ~ 8;
Wherein, described stitch 1,2,4,6 ground connection, the grid G of described stitch 3 connecting resistance R22 and power field effect pipe MOSFET Q successively, the drain D of described power field effect pipe MOSFET Q meets the other end, the resistance R23 and electric capacity C20 of described isolating transformer TM1 secondary voltage output L3 respectively, described electric capacity C20 is connecting resistance R20 and resistance R21, described resistance R20 and resistance R21 ground connection respectively; The source S of described power field effect pipe MOSFET Q connects with resistance R20 and resistance R21 respectively;
Described stitch 8 is connecting resistance R23 and resistance R24 respectively, described resistance R24 ground connection;
Described stitch 7 is connecting resistance R25 and resistance R26 respectively, described resistance R26 ground connection;
Described stitch 5 meets inductance L 10, electrochemical capacitor C22, resistance R25 and electric capacity C21 respectively, described electric capacity C21 ground connection, described electrochemical capacitor C22 ground connection, described inductance L 10 connects with the 4th voltage output end Vout4 of described synchronous rectification filter circuit 106, and described 4th voltage output end Vout4 is by an electrochemical capacitor C23 ground connection.
It should be noted that, in described second integrated circuit (IC) 2, described stitch 1,2,6 is signal ground terminal AGND(Analog-Ground pin), integrated circuit (IC) 2 small-signal partial earthing terminal;
Stitch 4 is earth terminal GND(Ground pin), the high-power partial earthing terminal of IC2, is directly connected with built-in MOSFET source S.During board design, after all small-signal partial earthings gather, be connected with this terminal single-point.High-power and earth terminal that is small-signal are separated, the impact of interference on integrated circuit stability can be reduced;
Described stitch 3 is gate drive signal terminal GATE, is connected to the drive singal of power MOSFET grid G;
Stitch 5 starts power supply terminal VDD, for integrated circuit (IC) 2 provides starting resistor;
Stitch 7 is reset detection terminal RES(Reset pin), detect output voltage Vout4, to realize the reset control linear measuring ability of integrated circuit (IC) 2 by divider resistance R25, R26;
Stitch 8 is winding voltage detection terminal LPC, the voltage when detection power MOSFET conducting on secondary winding.
In the present invention, the two ends of the secondary voltage output L3 of described isolating transformer TM1 are fixed with rivet EY5, rivet EY6 respectively, described rivet EY5, rivet EY6 for fixed weight or the larger components and parts of volume, increase the firm welding of component on circuit boards.
See Fig. 5, described two-way direct current voltage stabilization output 107 comprises the 3rd integrated circuit (IC) 3, and described 3rd integrated circuit (IC) 3 comprises stitch 1 ~ 8;
Wherein, described stitch 1 meets inductance L 20, resistance R250 respectively, and described inductance L 20 is connected with the 5th voltage output end Vout5;
Described stitch 2 is connected with resistance R250 by electric capacity C102;
Described stitch 3 is connecting resistance R260 and resistance R270 respectively, and described resistance R260 connects with tertiary voltage input Vin3, described resistance R270 ground connection;
Described stitch 4 meets electric capacity C101, electric capacity C30 respectively, electric capacity C8, electric capacity C9 and tertiary voltage input Vin3, described tertiary voltage input Vin3 connects with the 4th voltage output end Vout4, described electric capacity C101 is by an electric capacity C201 ground connection, described electric capacity C30 passes through an electric capacity C40 ground connection, described electric capacity C8 and C9 ground connection;
Described stitch 5 ground connection, described stitch 6 respectively connecting resistance R230 and resistance R240, described resistance R230 is connected with the 6th voltage output end Vout6 with after electric capacity C220 parallel connection, described resistance R240 ground connection;
Described stitch 7 connects with inductance L 30, and described inductance L 30 connects with the node between described resistance R230 and the 6th voltage output end Vout6;
Described stitch 8 meets the 5th voltage output end Vout5, electric capacity C16 and electric capacity C17 respectively, and described electric capacity C16 and electric capacity C17 is ground connection respectively;
Described 5th voltage output end Vout5 connects with electric capacity C14, electric capacity C15 respectively, and described electric capacity C14 and electric capacity C15 is ground connection respectively;
Described 6th voltage output end Vout6 connects with electric capacity C24, electric capacity C25 respectively, and described electric capacity C24 and electric capacity C25 is ground connection respectively.
It should be noted that, in described 3rd integrated circuit (IC) 3, described stitch 1 is a reduced output voltage terminal SW, connects and composes Buck reduction voltage circuit with inductance L 20, obtains a voltage Vout5 higher in two-way output;
Described stitch 2 is step-down drive terminal BST, is connected with SW terminal by electric capacity C102.The driving voltage of a step-down MOSFET grid G in exporting as two-way;
Described stitch 3 is enable terminals of enable terminal EN, integrated circuit (IC) 3.This terminal voltage activates higher than 2.8V integrated circuit (IC) 3, and voltage is closed lower than 1.5V integrated circuit (IC) 3 and stopped;
Described stitch 4 starts power supply terminal Vin, for the startup of integrated circuit (IC) 3 provides voltage;
Described stitch 5 is earth terminal GND '
Described stitch 6 is feedback terminal FBL, is connected to a voltage Vout6 lower in two-way output, forms the feedback loop of over all Integration IC circuit 3 by sampling resistor R230, R240;
Described stitch 7 is secondary reduced output voltage terminal SWL, connects and composes Buck reduction voltage circuit with inductance L 30, obtains a voltage Vout6 lower in two-way output;
Described stitch 8 is secondary step-down input terminal Vout, and a voltage Vout5 higher in exporting with two-way is connected, in integrated circuit (IC) 3 inside using the input voltage of the voltage Vout5 of a reduced output voltage as secondary reduced output voltage Vout6.
Specific embodiment:
For the present invention, with external communication input 220V/50Hz sine voltage, it is that example illustrates operation principle of the present invention that synchronous rectification exports A+14V, doubleway output A+5V/A+3.3V.
External communication input voltage signal is by after electromagnetic interference filter circuit, and be still 220V/50Hz sine voltage, waveform and amplitude frequency all do not change, just filtering conducted interference and radiated interference.After the full-bridge rectification of high-voltage rectifier, be converted to the direct voltage only having forward wave, after the flat ripple effect of electrochemical capacitor C100 in Fig. 2, become the direct voltage with 100Hz ripple of about 310V.The first integrated circuit (IC) 1 in Fig. 3 is main formation DC chopped-wave and pulse-width modulation circuit, after this circuit, transformer is elementary by the high-frequency direct-current voltage of an acquisition 20KHz ~ 80KHz, in transforming circuit, the turn ratio of isolation voltage device TM1 converts again, exports the A+14V direct voltage with 20KHz ~ 80KHz ripple after secondary synchronization rectifying and wave-filtering.The present invention is owing to being open loop transmission system, and this A+14V voltage can along with the increase of load or reduction, and amplitude change rate is larger.Using the input Vin of this+14V voltage the 3rd integrated circuit (IC) 3 in two-way direct current voltage stabilization output 107, final acquisition stable VD A+5V and A+3.3V.
Known based on technique scheme, compared with existing power circuit, the present invention has a circuit of synchronous rectification 106 and a two-way direct current voltage stabilization output 107.In transforming circuit 105, the secondary voltage output L3 of isolating transformer TM1 is connected to the voltage input end of circuit of synchronous rectification 106, and the voltage output end (i.e. the 4th voltage output end Vout4) of circuit of synchronous rectification 106 is as the voltage input end (i.e. tertiary voltage input Vout3) of two-way direct current voltage stabilization output 107.
Known by testing, circuit of synchronous rectification of the present invention, compares traditional diode, and rectification efficiency improves 2 ~ 3%.Traditional PSR electric source topology only can be applied to the small-sized stabilized voltage power supply that power is less than 10W, the present invention, after increase circuit of synchronous rectification, can be applied to the power power-supply of about 100W.
The present invention, by increasing two-way direct current voltage stabilization output, can solve traditional PS R output voltage and float larger problem with loading rate, improve the stability of system.The input Vin voltage of this two-way direct current voltage stabilization output is the wide input range of a few volt to tens volt, and it exports is then can be the stable constant voltage of self-defined setting.When load increases, although there is larger change in the output voltage of circuit of synchronous rectification, but still can meet the voltage input requirements of the 3rd integrated circuit (IC) in two-way direct current voltage stabilization output, therefore do not affect the last voltage of two-way direct current voltage stabilization output to export, mainboard master chip even load and other electric equipments still can obtain required stable power-supplying.
In the present invention, the electric equipment of described outside need electricity consumption can be any one electric equipment, such as, can be television set, notebook computer etc.
In sum, compared with prior art, a kind of electric equipment power supply provided by the invention, it is owing to have employed two-way direct current voltage stabilization output, therefore output voltage is not easy the impact being subject to load, have higher stability and reliability, and by adopt circuit of synchronous rectification, can rectification efficiency be improved, thus support that relatively high power exports, be conducive to for various load provides stable power-supplying, ensure the normal operation of electric equipment even load, be of great practical significance.
In addition, for electric equipment power supply provided by the invention, adopt less electronic unit because its needs have, therefore, production cost is lower, and Electro Magnetic Compatibility is good, is conducive to producing widely universal.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. an electric equipment power supply, is characterized in that, comprising:
Ac input circuit, is connected with external ac power source, receives the alternating voltage that external ac power source exports, then exports to electromagnetic interference filter circuit;
Electromagnetic interference filter circuit, is connected with ac input circuit, for the alternating voltage filtering electromagnetic interference exported ac input circuit, is specially conducted interference and the radiated interference of filtering electromagnetic interference, then exports to boosting current rectifying and wave filtering circuit;
Boosting current rectifying and wave filtering circuit, be connected with electromagnetic interference filter circuit, the alternating voltage for exporting electromagnetic interference filter circuit boosts and rectification, forms direct voltage, and then exports to DC chopped-wave pulse-width modulation circuit after filtering;
DC chopped-wave pulse-width modulation circuit, is connected with boosting current rectifying and wave filtering circuit, carries out pulse width modulation, form the direct voltage of predeterminated frequency scope, then export to transforming circuit for the direct voltage exported by boosting current rectifying and wave filtering circuit;
Transforming circuit, is connected with DC chopped-wave pulse-width modulation circuit, carries out step-down process, then export to synchronous rectification filter circuit for the direct voltage exported DC chopped-wave pulse-width modulation circuit;
Synchronous rectification filter circuit, is connected with transforming circuit, carries out synchronous filtering, then export to two-way direct current voltage stabilization output for the direct voltage exported transforming circuit;
Two-way direct current voltage stabilization output, is connected with synchronous rectification filter circuit, for after the road direct voltage receiving the output of synchronous rectification filter circuit, is converted to two-way pre-set constant voltage, then exports to the electric equipment of outside need electricity consumption; Described two-way direct current voltage stabilization output includes integrated circuit (IC) 3, and described integrated circuit (IC) 3 comprises:
A reduced output voltage terminal SW, for the formation of a Buck reduction voltage circuit, obtains an output voltage higher in two-way output to voltage output end Vout5;
Secondary reduced output voltage terminal SWL, for the formation of quadratic B uck reduction voltage circuit, obtains an output voltage lower in two output voltage to voltage output end Vout6.
2. power supply as claimed in claim 1; it is characterized in that; described ac input circuit includes voltage input end Vin1; a described voltage input end Vin1 and piezo-resistance VA1 is in parallel, and the line between described voltage input end Vin1 and piezo-resistance VA1 has an over-current protection device.
3. power supply as claimed in claim 2, it is characterized in that, described over-current protection device is fuse.
4. power supply as claimed in claim 2 or claim 3, it is characterized in that, described electromagnetic interference filter circuit comprises a filter LF1, voltage input end Vin1 in the input A1 of described filter LF1 and described ac input circuit is in parallel, and the input A1 of described filter LF1 is also in parallel with an electric capacity C1, the series arm that is made up of resistance R100, resistance R200 and resistance R300 respectively; An output B1 and electric capacity C2 of described filter LF1 is in parallel.
5. power supply as claimed in claim 4, it is characterized in that, described boosting current rectifying and wave filtering circuit comprises a rectifier bridge DB1, the input of described rectifier bridge DB1 and the output B1 of described electromagnetic interference filter circuit median filter LF1 are in parallel, the output of described rectifier bridge DB1 is connected with voltage output end Vout1, and described voltage output end Vout1 is also by electrochemical capacitor C100 ground connection.
6. power supply as claimed in claim 5, it is characterized in that, described DC chopped-wave pulse-width modulation circuit comprises integrated circuit (IC) 1, and described integrated circuit (IC) 1 comprises stitch 1 ~ 7;
In described integrated circuit (IC) 1, described stitch 1 connects with resistance R5, electric capacity C6 respectively, and described resistance R5 passes through resistance R6 ground connection, described electric capacity C6 ground connection; Connecting resistance R11 and resistance R12, described resistance R12 are by resistance R13 ground connection respectively for described stitch 2, and described resistance R11 is connected with the ungrounded end of voltage output end Vout3 by resistance R10; Described stitch 3 is connecting resistance R4 and electric capacity C5 respectively, described electric capacity C5 ground connection, and described resistance R4 is by electric capacity C4 ground connection;
Described stitch 4 is connecting resistance R9 and electric capacity C7 respectively, described electric capacity C7 ground connection, described resistance R9 is connecting resistance R8 and resistance R7 successively, described resistance R7 connects with the negative pole of diode D2, the positive pole of described diode D2 connects with one end of voltage output end Vout3, the other end ground connection of described voltage output end Vout3; Described stitch 5 ground connection, described stitch 6 is vacant; Described stitch 7 connects the positive pole of diode D1 and one end of voltage output end Vout2 respectively, the negative pole connecting resistance R3 and electric capacity C3 respectively of described diode D1, described resistance R3 is connected with voltage input end Vin2 by resistance R2, described voltage input end Vin2 is connected with voltage output end Vout1, and described voltage input end Vin2 connects with the other end of electric capacity C3, voltage output end Vout2 respectively;
Wherein, stitch 1 is control terminal PD, postpones the turn-off time for the current limit of integrated circuit (IC) 1 and when integrated circuit (IC) 1 turns off; Stitch 2 is feedback terminal FB, for detecting the secondary output voltage change of described transforming circuit; Stitch 3 compensates terminal CP, by connecting the RC circuit be made up of resistance R4, electric capacity C4, electric capacity C5, forms a control loop compensating network; Stitch 4 starts terminal BP, for providing starting resistor for integrated circuit (IC) 1 and selecting the starting state of integrated circuit (IC) 1 after running into fault; Stitch 5 is source terminal S, i.e. the source S of this integrated circuit (IC) 1 built-in switch pipe MOSFET; Stitch 6 is vacant terminal NC, for increasing the insulation clearance between stitch 5 and stitch 7, prevents electrion; Stitch 7 is drain terminal D, i.e. the drain D of this integrated circuit (IC) 1 built-in switch pipe MOSFET.
7. power supply as claimed in claim 6, it is characterized in that, described transforming circuit comprises an isolating transformer TM1, the primary voltage input L1 of described isolating transformer TM1 connects with the ungrounded end of voltage output end Vout2, and the primary voltage input L2 of described isolating transformer TM1 connects with the ungrounded end of voltage output end Vout3;
The earth terminal of described isolating transformer TM1 secondary voltage output L3 is connected by an electric capacity C200 with the earth terminal of primary voltage input L1.
8. power supply as claimed in claim 7, it is characterized in that, described synchronous rectification filter circuit includes integrated circuit (IC) 2, and described integrated circuit (IC) 2 comprises stitch 1 ~ 8;
In described integrated circuit (IC) 2, described stitch 1,2,6 is signal ground terminal AGND, i.e. integrated circuit (IC) 2 small-signal partial earthing terminal; Stitch 4 is earth terminal GND, i.e. the high-power partial earthing terminal of integrated circuit (IC) 2, is directly connected with the built-in MOSFET source S of this integrated circuit (IC) 2, described stitch 1,2,4,6 ground connection; Stitch 3 is gate drive signal terminal GATE, described stitch 3 connects the grid G of power field effect pipe MOSFETQ by resistance R22, the drain D of described power field effect pipe MOSFETQ meets the other end, the resistance R23 and electric capacity C20 of described isolating transformer TM1 secondary voltage output L3 respectively, described electric capacity C20 is connecting resistance R20 and resistance R21, described resistance R20 and resistance R21 ground connection respectively; The source S of described power field effect pipe MOSFETQ connects with resistance R20 and resistance R21 respectively;
Described stitch 8 is winding voltage detection terminal LPC, when detection power field effect transistor MOSFETQ conducting described transforming circuit secondary winding on voltage, respectively connecting resistance R23 and resistance R24, described resistance R24 ground connection;
Described stitch 7 is reset detection terminal RES, respectively connecting resistance R25 and resistance R26, and described resistance R26 ground connection detects output voltage Vout4, to realize the reset control linear measuring ability of integrated circuit (IC) 2 by divider resistance R25, R26;
Described stitch 5 starts power supply terminal VDD, for integrated circuit (IC) 2 provides starting resistor, meet inductance L 10, electrochemical capacitor C22, resistance R25 and electric capacity C21 respectively, described electric capacity C21 ground connection, described electrochemical capacitor C22 ground connection, described inductance L 10 connects with the voltage output end Vout4 of described synchronous rectification filter circuit, and described voltage output end Vout4 is by an electrochemical capacitor C23 ground connection.
9. power supply as claimed in claim 8, it is characterized in that, described two-way direct current voltage stabilization output comprises integrated circuit (IC) 3, and described integrated circuit (IC) 3 comprises stitch 1 ~ 8;
In described integrated circuit (IC) 3, described stitch 1 meets inductance L 20, resistance R250 respectively, and described inductance L 20 is connected with voltage output end Vout5;
Described stitch 2 is connected with resistance R250 by electric capacity C102;
Described stitch 3 is connecting resistance R260 and resistance R270 respectively, and described resistance R260 connects with voltage input end Vin3, described resistance R270 ground connection;
Described stitch 4 meets electric capacity C101, electric capacity C30 respectively, electric capacity C8, electric capacity C9 and voltage input end Vin3, described voltage input end Vin3 connects with the voltage output end Vout4 of described synchronous rectification filter circuit, described electric capacity C101 is by an electric capacity C201 ground connection, described electric capacity C30 passes through an electric capacity C40 ground connection, described electric capacity C8 and C9 ground connection;
Described stitch 5 ground connection, described stitch 6 respectively connecting resistance R230 and resistance R240, described resistance R230 is connected with voltage output end Vout6 with after electric capacity C220 parallel connection, described resistance R240 ground connection; Described stitch 7 connects with inductance L 30, and the node between described inductance L 30 with described resistance R230 and voltage output end Vout6 connects;
Described stitch 8 meets voltage output end Vout5, electric capacity C16 and electric capacity C17 respectively, and described electric capacity C16 and electric capacity C17 is ground connection respectively;
Wherein, described stitch 1 is a reduced output voltage terminal SW, forms a Buck reduction voltage circuit with inductance L 20, obtains an output voltage higher in two-way output to voltage output end Vout5;
Described stitch 2 is step-down drive terminal BST, is connected successively by electric capacity C102 and resistance 250 with a reduced output voltage terminal SW, the driving voltage of a step-down MOSFET grid G in exporting as two-way;
Described stitch 3 is enable terminal EN, and this terminal voltage activates higher than integrated circuit (IC) during a magnitude of voltage 3, close stopping lower than integrated circuit (IC) during a magnitude of voltage 3;
Described stitch 4 starts power supply terminal Vin, for the startup of integrated circuit (IC) 3 provides voltage;
Described stitch 5 is earth terminal GND;
Described stitch 6 is feedback terminal FBL, is connected to a voltage output end Vout6 lower in two output voltage by sampling resistor R230, R240, forms the feedback loop of over all Integration IC circuit 3;
Described stitch 7 is secondary reduced output voltage terminal SWL, connects and composes quadratic B uck reduction voltage circuit with inductance L 30, obtains an output voltage lower in two output voltage to voltage output end Vout6;
Described stitch 8 is secondary step-down input terminal Vout, be connected with a voltage output end Vout5 higher in two output voltage, in integrated circuit (IC) 3 inside using reduced output voltage to the voltage of voltage output end Vout5 as the input voltage of secondary reduced output voltage end Vout6.
10. power supply as claimed in claim 9, it is characterized in that, described voltage output end Vout5 connects with electric capacity C14, electric capacity C15 respectively, and described electric capacity C14 and electric capacity C15 is ground connection respectively; Described voltage output end Vout6 connects with electric capacity C24, electric capacity C25 respectively, and described electric capacity C24 and electric capacity C25 is ground connection respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210548507.1A CN102983762B (en) | 2012-12-18 | 2012-12-18 | Power supply of electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210548507.1A CN102983762B (en) | 2012-12-18 | 2012-12-18 | Power supply of electrical equipment |
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| CN102983762B true CN102983762B (en) | 2015-05-13 |
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| CN106911255B (en) * | 2015-12-22 | 2020-02-14 | 天津三星电子有限公司 | Power adapter |
| CN117674612A (en) * | 2024-02-01 | 2024-03-08 | 深圳市力生美半导体股份有限公司 | Power supply circuit and switching power supply |
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| CN101350557A (en) * | 2007-07-18 | 2009-01-21 | 华为技术有限公司 | Apparatus for adjusting power supply |
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