CN102983762A - Power supply of electrical equipment - Google Patents
Power supply of electrical equipment Download PDFInfo
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- CN102983762A CN102983762A CN2012105485071A CN201210548507A CN102983762A CN 102983762 A CN102983762 A CN 102983762A CN 2012105485071 A CN2012105485071 A CN 2012105485071A CN 201210548507 A CN201210548507 A CN 201210548507A CN 102983762 A CN102983762 A CN 102983762A
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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 day by day raising 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 equipments have become people's indispensable part of living.
For various electric equipments, usually need to be connected with power supply, for present power circuit, usually adopt secondary feedback regulation formula SSR circuit structure and former limit feedback regulation formula PSR circuit structure.
Wherein, for secondary feedback regulation formula SSR circuit structure, it need 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, so the market competitiveness is poor, has influence on extensively popularizing on market.
And for former limit feedback regulation formula PSR circuit structure, there is the weak problem of load capacity in it, be only applicable at present the following small-power type voltage-stabilized power supply circuit of 10W, and the less stable of output voltage, marked change occurs in output voltage easily along with load variations, 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 to be subject to the impact of load, have higher stability and reliability, and support relatively high power output, only need to have and adopt less electronic unit, therefore, production cost is lower, and Electro Magnetic Compatibility is good, be conducive to for various loads provide stable power-supplying, guarantee the normal operation of electric equipment even load.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of electric equipment power supply, its output voltage is not easy to be subject to the impact of load, have higher stability and reliability, and support relatively high power output, only need to have and adopt less electronic unit, therefore, production cost is lower, Electro Magnetic Compatibility is good, be conducive to for various loads provide stable power-supplying, guarantee 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 of external ac power source output, then exports to electromagnetic interference filter circuit;
Electromagnetic interference filter circuit is connected with ac input circuit, for the alternating voltage filtering electromagnetic interference that ac input circuit is exported, is specially conducted interference and the radiated interference of filtering electromagnetic interference, then exports to the current rectifying and wave filtering circuit that boosts;
The current rectifying and wave filtering circuit that boosts is connected with electromagnetic interference filter circuit, is used for the alternating voltage of electromagnetic interference filter circuit output is boosted and rectification, forms direct voltage, then exports to the DC chopped-wave pulse-width modulation circuit after filtering;
The DC chopped-wave pulse-width modulation circuit is connected with the current rectifying and wave filtering circuit that boosts, and the direct voltage of exporting for the current rectifying and wave filtering circuit that will boost carries out pulse width modulation, forms the direct voltage of predeterminated frequency scope, then exports to transformer;
Transforming circuit is connected with the DC chopped-wave pulse-width modulation circuit, is used for the direct voltage of DC chopped-wave pulse-width modulation circuit output is carried out the step-down processing, then exports to the synchronous rectification filter circuit;
The synchronous rectification filter circuit is connected with transforming circuit, is used for the direct voltage of transforming circuit output is carried out synchronous filtering, then exports to the two-way DC voltage-stabilizing output circuit;
The two-way DC voltage-stabilizing output circuit is connected with the synchronous rectification filter circuit, is used for behind the road direct voltage that receives the output of synchronous rectification filter circuit, is converted to the default constant voltage of two-way, then exports to the electric equipment of outside need electricity consumption.
Wherein, described ac input circuit includes the first voltage input end Vin1; described the first voltage input end Vin1 and a piezo-resistance VA1 are in parallel, and have an over-current protection device on the line between described the first voltage input end Vin1 and the piezo-resistance VA1.
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 the described ac input circuit is in parallel, and the input A1 of described filter LF1 also is in parallel with a capacitor C 1, the series arm that is comprised of resistance R 100, resistance R 200 and resistance R 300 respectively;
The output B1 of described filter LF1 and a capacitor C 2 are in parallel.
Wherein, the described current rectifying and wave filtering circuit that boosts 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 the 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 the first integrated circuit (IC) 1 comprises stitch 1 ~ 7;
In described the first integrated circuit (IC) 1, described stitch 1 joins with resistance R 5, capacitor C 6 respectively, and described resistance R 5 is by resistance R 6 ground connection, described capacitor C 6 ground connection;
Described stitch 2 is connecting resistance R11 and resistance R 12 respectively, and described resistance R 12 is by resistance R 13 ground connection, and described resistance R 11 is joined with tertiary voltage output end vo ut3 by resistance R 10;
Described stitch 3 is connecting resistance R4 and capacitor C 5 respectively, described capacitor C 5 ground connection, and described resistance R 4 is by capacitor C 4 ground connection;
Described stitch 4 is connecting resistance R9 and capacitor C 7 respectively, described capacitor C 7 ground connection, described resistance R 9 is connecting resistance R8 and resistance R 7 successively, the negative pole of described resistance R 7 and diode D2 joins, the end of the positive pole of described diode D2 and tertiary voltage output end vo ut3 joins, 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 respectively the positive pole of diode D1 and the end of second voltage output end vo ut2, the negative pole of described diode D1 is connecting resistance R3 and capacitor C 3 respectively, described resistance R 3 is joined with second voltage input Vin2 by resistance R 2, described second voltage input Vin2 is connected with the first voltage output end Vout1, and described second voltage input Vin2 joins with the other end of capacitor C 3, second voltage output end vo ut2 respectively.
Wherein, described transforming circuit comprises an isolating transformer TM1, the primary voltage input L1 of described isolating transformer TM1 and second voltage output end vo ut2 join, and the primary voltage input L2 of described isolating transformer TM1 and tertiary voltage output end vo ut3 join;
The earth terminal of described isolating transformer TM1 secondary voltage output L3 and the earth terminal of primary voltage input L1 join by a capacitor C 200.
Wherein, described synchronous rectification filter circuit includes the second integrated circuit (IC) 2, and described the second integrated circuit (IC) 2 comprises stitch 1 ~ 8;
In described the second integrated circuit (IC) 2, described stitch 1,2,4,7 ground connection, described stitch 3 is the grid G of connecting resistance R22 and power field effect pipe MOSFET Q successively, the drain D of described power field effect pipe MOSFET Q connects respectively the other end, resistance R 23 and the capacitor C 20 of described isolating transformer TM1 secondary voltage output L3, described capacitor C 20 is connecting resistance R20 and resistance R 21 respectively, described resistance R 20 and resistance R 21 ground connection; The source S of described power field effect pipe MOSFET Q is joined with resistance R 20 and resistance R 21 respectively;
Described stitch 5 is connecting resistance R23 and resistance R 24 respectively, described resistance R 24 ground connection;
Described stitch 6 is connecting resistance R25 and resistance R 26 respectively, described resistance R 26 ground connection;
Described stitch 8 connects respectively inductance L 10, electrochemical capacitor C22, resistance R 25 and capacitor C 21, described capacitor C 21 ground connection, described electrochemical capacitor C22 ground connection, the 4th voltage output end Vout4 of described inductance L 10 and described synchronous rectification filter circuit joins, and described the 4th voltage output end Vout4 is by an electrochemical capacitor C23 ground connection.
Wherein, described two-way DC voltage-stabilizing output circuit comprises the 3rd integrated circuit (IC) 3, and described the 3rd integrated circuit (IC) 3 comprises stitch 1 ~ 8;
In described the 3rd integrated circuit (IC) 3, described stitch 1 connects respectively inductance L 20, resistance R 250, and described inductance L 20 is connected with the 5th voltage output end Vout5;
Described stitch 2 joins by capacitor C 102 and resistance R 250;
Described stitch 3 is connecting resistance R260 and resistance R 270 respectively, and described resistance R 260 is joined described resistance R 270 ground connection with tertiary voltage input Vin3;
Described stitch 4 connects respectively capacitor C 101, capacitor C 30, capacitor C 8, capacitor C 9 and tertiary voltage input Vin3, described tertiary voltage input Vin3 and the 4th voltage output end Vout4 join, described capacitor C 101 is by capacitor C 201 ground connection, described capacitor C 30 is by capacitor C 40 ground connection, described capacitor C 8 and C9 ground connection;
Described stitch 5 ground connection, described stitch 6 is connecting resistance R230 and resistance R 240 respectively, and described resistance R 230 is connected described resistance R 240 ground connection with capacitor C 220 parallel connections are rear with the 6th voltage output end Vout6;
Described stitch 7 joins with inductance L 30, and the node between described inductance L 30 and described resistance R 230 and the 6th voltage output end Vout6 joins;
Described stitch 8 connects respectively the 5th voltage output end Vout5, capacitor C 16 and capacitor C 17, and described capacitor C 16 and capacitor C 17 be ground connection respectively.
Wherein, described the 5th voltage output end Vout5 joins with capacitor C 14, capacitor C 15 respectively, and described capacitor C 14 and capacitor C 15 be ground connection respectively;
Described the 6th voltage output end Vout6 joins with capacitor C 24, capacitor C 25 respectively, and described capacitor C 24 and capacitor C 25 be ground connection respectively.
By above technical scheme provided by the invention as seen, compared with prior art, the invention provides a kind of electric equipment power supply, it is owing to adopted the two-way DC voltage-stabilizing output circuit, therefore output voltage is not easy to be subject to the impact of load, have higher stability and reliability, and by adopting circuit of synchronous rectification, can improve rectification efficiency, thereby support relatively high power output, be conducive to for various loads provide stable power-supplying, guarantee 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 produce widely universal.
Description of drawings
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 the current rectifying and wave filtering circuit that boosts 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 DC voltage-stabilizing output circuit in a kind of electric equipment power supply provided by the invention.
Embodiment
In order to make those skilled in the art person understand better the present invention program, the present invention is described in further detail below in conjunction with drawings and embodiments.
Referring to Fig. 1, the invention provides a kind of electric equipment power supply, comprise ac input circuit 101, electromagnetic interference filter circuit 102, the current rectifying and wave filtering circuit 103 that boosts, DC chopped-wave pulse-width modulation circuit 104, transforming circuit 105, synchronous rectification filter circuit 106 and two-way DC voltage-stabilizing output circuit 107, wherein:
Electromagnetic interference filter circuit 102, be connected with ac input circuit 101, for the alternating voltage filtering electromagnetic interference that ac input circuit 101 is exported, be specially conducted interference and the radiated interference of filtering electromagnetic interference, then export to the current rectifying and wave filtering circuit 103 that boosts;
The current rectifying and wave filtering circuit 103 that boosts is connected with electromagnetic interference filter circuit 102, is used for the alternating voltage of electromagnetic interference filter circuit 102 outputs is boosted and rectification, forms direct voltage, then exports to DC chopped-wave pulse-width modulation circuit 104 after filtering;
DC chopped-wave pulse-width modulation circuit 104 is connected with the current rectifying and wave filtering circuit 103 that boosts, and the direct voltage of exporting for the current rectifying and wave filtering circuit 103 that will boost carries out pulse width modulation, forms the direct voltage of predeterminated frequency scope, then exports to transformer 105;
Transforming circuit 105 is connected with DC chopped-wave pulse-width modulation circuit 104, is used for the direct voltage of DC chopped-wave pulse-width modulation circuit 104 outputs is carried out the step-down processing, then exports to synchronous rectification filter circuit 106;
Synchronous rectification filter circuit 106 is connected with transforming circuit 105, is used for the direct voltage of transforming circuit 105 outputs is carried out synchronous filtering, then exports to two-way DC voltage-stabilizing output circuit 107;
Two-way DC voltage-stabilizing output circuit 107, be connected with synchronous rectification filter circuit 106, be used for behind the road direct voltage that receives 106 outputs of synchronous rectification filter circuit, be converted to the default constant voltage of two-way, then export to the electric equipment of outside need electricity consumption.
For clear each circuit of understanding the invention described above, the following describes the concrete structure of each circuit.
Referring to 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), described the first voltage input end Vin1 and a piezo-resistance VA1 are in parallel, and have a fuse F1 on the line between described the first voltage input end Vin1 and the piezo-resistance VA1.
Need to prove; described piezo-resistance VA1 is the lightning discharge protective device, and English name Varistor is made of the diode of two docking; its effect is in the first voltage input end Vin1 be subject to being struck by lightning transient switching discharge, to reach the purpose of protection rear end load.
In the present invention, the first voltage input end Vin1 is used for the outside alternating voltage of input, can size be the alternating voltage of 47Hz ~ 63Hz for 85V ~ 265V, frequency for example.
In the present invention, the overcurrent protection effect that act as that described fuse F1 plays in circuit, on the specific implementation, fuse can also be replaced by other over-current protection device.
In the present invention, the two ends of described the first voltage input end Vin1 are fixed with respectively rivet EY1, rivet EY2, and described rivet EY1, rivet EY2 are used for fixed weight or the larger components and parts of volume at circuit board, increase the firm welding of component.
For electromagnetic interference filter circuit 102, need to prove that the conducted interference of electromagnetic interference refers to by conducting medium the signal coupling (interference) on the electric network be arrived another electric network.Radiated interference refers to that interference source arrives another electric network to its signal coupling (interference) by the space.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, and the energy emitting electromagnetic wave also affects other system or the normal operation of interior other subsystems of native system.
Referring to 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 the described ac input circuit 101 is in parallel, and the input A1 of described filter LF1 also is in parallel with a capacitor C 1, the series arm that is comprised of resistance R 100, resistance R 200 and resistance R 300 respectively;
The output B1 of described filter LF1 and a capacitor C 2 are in parallel.
In the present invention, on the specific implementation, boost current rectifying and wave filtering circuit 103 just sine wave AC voltage convert direct voltage same frequency, that have the regulation ripple to.
Referring to Fig. 2, in the present invention, the described current rectifying and wave filtering circuit 103 that boosts 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 the first voltage output end Vout1 is also by electrochemical capacitor C100 ground connection.
In the present invention, also be fixed with rivet EY3, rivet EY4 in the described current rectifying and wave filtering circuit 103 that boosts, described rivet EY3, rivet EY4 are used for fixed weight or the larger components and parts of volume at circuit board, increase the firm welding of component.
Need to prove, for DC chopped-wave pulse-width modulation circuit 104, can carry out the direct voltage conversion and namely use as the DC-DC transducer, simultaneously, can carry out pulse width modulation (PWM), be exactly in the one-period of control wave, and high level time accounts for the ratio (duty ratio) in whole cycle.
Referring to Fig. 3, in the present invention, described DC chopped-wave pulse-width modulation circuit 104 comprises the first integrated circuit (IC) 1, and described the first integrated circuit (IC) 1 comprises stitch 1 ~ 7;
Wherein, described stitch 1 joins with resistance R 5, capacitor C 6 respectively, and described resistance R 5 is by resistance R 6 ground connection, described capacitor C 6 ground connection;
Described stitch 2 is connecting resistance R11 and resistance R 12 respectively, and described resistance R 12 is by resistance R 13 ground connection, and described resistance R 11 is joined with tertiary voltage output end vo ut3 by resistance R 10;
Described stitch 3 is connecting resistance R4 and capacitor C 5 respectively, described capacitor C 5 ground connection, and described resistance R 4 is by capacitor C 4 ground connection;
Described stitch 4 is connecting resistance R9 and capacitor C 7 respectively, described capacitor C 7 ground connection, described resistance R 9 is connecting resistance R8 and resistance R 7 successively, the negative pole of described resistance R 7 and diode D2 joins, the end of the positive pole of described diode D2 and tertiary voltage output end vo ut3 joins, 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 respectively the positive pole of diode D1 and the end of second voltage output end vo ut2, the negative pole of described diode D1 is connecting resistance R3 and capacitor C 3 respectively, described resistance R 3 is joined with second voltage input Vin2 by resistance R 2, described second voltage input Vin2 is connected with the first voltage output end Vout1, and described second voltage input Vin2 joins with the other end of capacitor C 3, second voltage output end vo ut2 respectively.
Need to prove that in described the first integrated circuit (IC) 1, described stitch 1 is control terminal PD(Program Pin), this terminal has double action, and the one, for the current limit of integrated circuit (IC) 1, the 2nd, when turn-offing, IC1 postpones its turn-off time;
Described stitch 2 is feedback terminal FB(Feedback Pin), change for detection of output voltage.This terminal is connected on the elementary auxiliary winding L 2 by sampling resistor R10, R11, R12, R13.According to the induced electromotive force principle, when secondary output voltage changed, the rate of change of secondary voltage should become with the voltage change ratio on the elementary auxiliary winding L 2 transformer turn ratio example relation.Therefore FB pin detects the variation that the variation of assisting on the L2 of winding limit namely is the detection secondary output voltage;
Described stitch 3 is compensation terminal CP(Compensation pin), the external RC circuit that is comprised of R4, C4, C5 of this terminal consists of a control loop compensating network;
Described stitch 4 is to start terminal BP(Bypass pin), this connecting terminals is connected to elementary auxiliary winding L 2 and provides starting resistor for integrated circuit (IC) 1.This terminal external shunt capacitance C7 also is used for selecting the starting state of integrated circuit (IC) 1 after running into fault simultaneously.Can arrange that Auto-restart resets automatically or the 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), be used for increasing the insulation spacing between stitch 5 and the 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, referring to Fig. 4, described transforming circuit 105 can comprise an isolating transformer TM1, and described isolating transformer TM1 is to be the transformer of electric insulation between the former secondary coiling.
Referring to Fig. 4, described transforming circuit comprises an isolating transformer TM1, the primary voltage input L1 of described isolating transformer TM1 and second voltage output end vo ut2 join, and the primary voltage input L2 of described isolating transformer TM1 and tertiary voltage output end vo ut3 join;
The earth terminal of described isolating transformer TM1 secondary voltage output L3 and the earth terminal of primary voltage input L1 join by a capacitor C 200.
In the present invention, need to prove that described synchronous rectification filter circuit 106 adopts the extremely low power MOSFET of on state resistance, replaces existing rectifier diode, to reduce the technology of rectifier loss.It can improve the efficient of DC chopped-wave pulse-width modulation circuit 104 greatly, and does not have the dead band voltage that is 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 the voltage-phase of grid G just can finish rectification function synchronously with the phase preserving of the voltage that is rectified, so be referred to as synchronous rectification.
Referring to Fig. 4, for described synchronous rectification filter circuit 106, it includes the second integrated circuit (IC) 2, and described the second integrated circuit (IC) 2 comprises stitch 1 ~ 8;
Wherein, described stitch 1,2,4,6 ground connection, described stitch 3 is the grid G of connecting resistance R22 and power field effect pipe MOSFET Q successively, the drain D of described power field effect pipe MOSFET Q connects respectively the other end, resistance R 23 and the capacitor C 20 of described isolating transformer TM1 secondary voltage output L3, described capacitor C 20 is connecting resistance R20 and resistance R 21 respectively, described resistance R 20 and resistance R 21 ground connection; The source S of described power field effect pipe MOSFET Q is joined with resistance R 20 and resistance R 21 respectively;
Described stitch 8 is connecting resistance R23 and resistance R 24 respectively, described resistance R 24 ground connection;
Described stitch 7 is connecting resistance R25 and resistance R 26 respectively, described resistance R 26 ground connection;
Described stitch 5 connects respectively inductance L 10, electrochemical capacitor C22, resistance R 25 and capacitor C 21, described capacitor C 21 ground connection, described electrochemical capacitor C22 ground connection, the 4th voltage output end Vout4 of described inductance L 10 and described synchronous rectification filter circuit 106 joins, and described the 4th voltage output end Vout4 is by an electrochemical capacitor C23 ground connection.
Need to prove, in described the second integrated circuit (IC) 2, described stitch 1, the 2, the 6th, signal ground terminal AGND(Analog-Ground pin), integrated circuit (IC) 2 small-signal partial earthing terminals;
Stitch 4 is earth terminal GND(Ground pin), the high-power partial earthing terminal of IC2 directly links to each other with built-in MOSFET source S.During board design, after all small-signal partial earthings gather, link to each other with this terminal single-point.High-power and earth terminal small-signal is separated, can reduce disturbance on the impact of integrated circuit stability;
Described stitch 3 is gate drive signal terminal GATE, is connected to the driving signal of power MOSFET grid G;
Stitch 5 is to start power supply terminal VDD, for integrated circuit (IC) 2 provides starting resistor;
Stitch 7 is reset detection terminal RES(Reset pin), detect output voltage V out4 by divider resistance R25, R26, to realize the linear measuring ability of control that resets of integrated circuit (IC) 2;
Stitch 8 is winding voltage detection terminal LPC, the voltage during for detection of the power MOSFET conducting on the secondary winding.
In the present invention, the two ends of the secondary voltage output L3 of described isolating transformer TM1 are fixed with respectively rivet EY5, rivet EY6, described rivet EY5, rivet EY6 are used for fixed weight or the larger components and parts of volume at circuit board, increase the firm welding of component.
Referring to Fig. 5, described two-way DC voltage-stabilizing output circuit 107 comprises the 3rd integrated circuit (IC) 3, and described the 3rd integrated circuit (IC) 3 comprises stitch 1 ~ 8;
Wherein, described stitch 1 connects respectively inductance L 20, resistance R 250, and described inductance L 20 is connected with the 5th voltage output end Vout5;
Described stitch 2 joins by capacitor C 102 and resistance R 250;
Described stitch 3 is connecting resistance R260 and resistance R 270 respectively, and described resistance R 260 is joined described resistance R 270 ground connection with tertiary voltage input Vin3;
Described stitch 4 connects respectively capacitor C 101, capacitor C 30, capacitor C 8, capacitor C 9 and tertiary voltage input Vin3, described tertiary voltage input Vin3 and the 4th voltage output end Vout4 join, described capacitor C 101 is by capacitor C 201 ground connection, described capacitor C 30 is by capacitor C 40 ground connection, described capacitor C 8 and C9 ground connection;
Described stitch 5 ground connection, described stitch 6 is connecting resistance R230 and resistance R 240 respectively, and described resistance R 230 is connected described resistance R 240 ground connection with capacitor C 220 parallel connections are rear with the 6th voltage output end Vout6;
Described stitch 7 joins with inductance L 30, and the node between described inductance L 30 and described resistance R 230 and the 6th voltage output end Vout6 joins;
Described stitch 8 connects respectively the 5th voltage output end Vout5, capacitor C 16 and capacitor C 17, and described capacitor C 16 and capacitor C 17 be ground connection respectively;
Described the 5th voltage output end Vout5 joins with capacitor C 14, capacitor C 15 respectively, and described capacitor C 14 and capacitor C 15 be ground connection respectively;
Described the 6th voltage output end Vout6 joins with capacitor C 24, capacitor C 25 respectively, and described capacitor C 24 and capacitor C 25 be ground connection respectively.
Need to prove that in described the 3rd integrated circuit (IC) 3, described stitch 1 is a reduced output voltage terminal SW, connects and composes the Buck reduction voltage circuit with inductance L 20, obtain a higher voltage Vout5 in the two-way output;
Described stitch 2 is step-down drive terminal BST, is connected with the SW terminal by capacitor C 102.Driving voltage as a step-down MOSFET grid G in the two-way output;
Described stitch 3 is to enable terminal EN, integrated circuit (IC) 3 enable terminal.This terminal voltage is higher than 2.8V integrated circuit (IC) 3 and activates, and voltage is lower than 1.5V integrated circuit (IC) 3 and closes and stop;
Described stitch 4 is to start 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 in a lower voltage Vout6 in the two-way output by sampling resistor R230, R240, consists of the feedback loop of over all Integration IC circuit 3;
Described stitch 7 is secondary reduced output voltage terminal SWL, connects and composes the Buck reduction voltage circuit with inductance L 30, obtains a lower voltage Vout6 in the two-way output;
Described stitch 8 is secondary step-down input terminal Vout, be connected with a voltage Vout5 higher in the two-way output, in integrated circuit (IC) 3 inside with the voltage Vout5 of the reduced output voltage input voltage as secondary reduced output voltage Vout6.
Specific embodiment:
For the present invention, with external communication input 220V/50Hz sine voltage, synchronous rectification output A+14V, doubleway output A+5V/A+3.3V is that example illustrates operation principle of the present invention.
The external communication input voltage signal still is the 220V/50Hz sine voltage by after the electromagnetic interference filter circuit, and waveform and amplitude frequency all do not change, just filtering conducted interference and radiated interference.Through after the full-bridge rectification of high-voltage rectifier, be converted to the direct voltage that only has forward wave, after the flat ripple effect through electrochemical capacitor C100 among Fig. 2, become the direct voltage with 100Hz ripple about 310V.The first integrated circuit (IC) 1 among Fig. 3 is main consist of DC chopped-wave and pulse-width modulation circuit, the elementary high-frequency direct-current voltage that will obtain a 20KHz ~ 80KHz through transformer behind this circuit, pass through the turn ratio conversion of isolation voltage device TM1 in the transforming circuit, output has the A+14V direct voltage of 20KHz ~ 80KHz ripple behind the secondary synchronization rectifying and wave-filtering again.The present invention is owing to be the open loop transmission system, and this A+14V voltage can or reduce along with the increase of load, and amplitude change rate is larger.With this+14V voltage is as the input Vin of the 3rd integrated circuit (IC) 3 in the two-way DC voltage-stabilizing output circuit 107, finally obtains stable VD A+5V and A+3.3V.
Based on technique scheme as can be known, compare with existing power circuit, the present invention has a circuit of synchronous rectification 106 and a two-way DC voltage-stabilizing output circuit 107.The secondary voltage output L3 of isolating transformer TM1 is connected to the voltage input end of circuit of synchronous rectification 106 in the transforming circuit 105, and the voltage output end of circuit of synchronous rectification 106 (i.e. the 4th voltage output end Vout4) is as the voltage input end (being tertiary voltage input Vout3) of two-way DC voltage-stabilizing output circuit 107.
By test as can be known, circuit of synchronous rectification of the present invention is compared traditional diode, and rectification efficiency improves 2 ~ 3%.Traditional PSR electric source topology only can be applied to power less than the small-sized stabilized voltage power supply of 10W, the present invention can be applied to the power power-supply about 100W after increasing circuit of synchronous rectification.
The present invention is by increasing the two-way DC voltage-stabilizing output circuit, can solve traditional PS R output voltage with the loading rate larger problem that floats, and improves Systems balanth.The input Vin voltage of this two-way DC voltage-stabilizing output circuit is the wide input range of a few volt to tens volts, and its output then is to be the stable constant voltage of self-defined setting.When load increases, although larger variation occurs in the output voltage of circuit of synchronous rectification, but still can satisfy the voltage input requirements of the 3rd integrated circuit (IC) in the two-way DC voltage-stabilizing output circuit, therefore do not affect the last Voltage-output of two-way DC voltage-stabilizing output circuit, 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 thinking 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 adopted the two-way DC voltage-stabilizing output circuit, therefore output voltage is not easy to be subject to the impact of load, have higher stability and reliability, and by adopting circuit of synchronous rectification, can improve rectification efficiency, thereby support relatively high power output, be conducive to for various loads provide stable power-supplying, guarantee 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 produce widely universal.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle 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 of external ac power source output, then exports to electromagnetic interference filter circuit;
Electromagnetic interference filter circuit is connected with ac input circuit, for the alternating voltage filtering electromagnetic interference that ac input circuit is exported, is specially conducted interference and the radiated interference of filtering electromagnetic interference, then exports to the current rectifying and wave filtering circuit that boosts;
The current rectifying and wave filtering circuit that boosts is connected with electromagnetic interference filter circuit, is used for the alternating voltage of electromagnetic interference filter circuit output is boosted and rectification, forms direct voltage, then exports to the DC chopped-wave pulse-width modulation circuit after filtering;
The DC chopped-wave pulse-width modulation circuit is connected with the current rectifying and wave filtering circuit that boosts, and the direct voltage of exporting for the current rectifying and wave filtering circuit that will boost carries out pulse width modulation, forms the direct voltage of predeterminated frequency scope, then exports to transformer;
Transforming circuit is connected with the DC chopped-wave pulse-width modulation circuit, is used for the direct voltage of DC chopped-wave pulse-width modulation circuit output is carried out the step-down processing, then exports to the synchronous rectification filter circuit;
The synchronous rectification filter circuit is connected with transforming circuit, is used for the direct voltage of transforming circuit output is carried out synchronous filtering, then exports to the two-way DC voltage-stabilizing output circuit;
The two-way DC voltage-stabilizing output circuit is connected with the synchronous rectification filter circuit, is used for behind the road direct voltage that receives the output of synchronous rectification filter circuit, is converted to the default constant voltage of two-way, then exports to the electric equipment of outside need electricity consumption.
2. power supply as claimed in claim 1; it is characterized in that; described ac input circuit includes the first voltage input end Vin1; described the first voltage input end Vin1 and a piezo-resistance VA1 are in parallel, and have an over-current protection device on the line between described the first voltage input end Vin1 and the piezo-resistance VA1.
3. power supply as claimed in claim 2 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, the first voltage input end Vin1 in the input A1 of described filter LF1 and the described ac input circuit is in parallel, and the input A1 of described filter LF1 also is in parallel with a capacitor C 1, the series arm that is comprised of resistance R 100, resistance R 200 and resistance R 300 respectively;
The output B1 of described filter LF1 and a capacitor C 2 are in parallel.
5. power supply as claimed in claim 4, it is characterized in that, the described current rectifying and wave filtering circuit that boosts 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 the first voltage output end Vout1 is also by electrochemical capacitor C100 ground connection.
6. power supply as claimed in claim 5 is characterized in that, described DC chopped-wave pulse-width modulation circuit comprises the first integrated circuit (IC) 1, and described the first integrated circuit (IC) 1 comprises stitch 1 ~ 7;
In described the first integrated circuit (IC) 1, described stitch 1 joins with resistance R 5, capacitor C 6 respectively, and described resistance R 5 is by resistance R 6 ground connection, described capacitor C 6 ground connection;
Described stitch 2 is connecting resistance R11 and resistance R 12 respectively, and described resistance R 12 is by resistance R 13 ground connection, and described resistance R 11 is joined with tertiary voltage output end vo ut3 by resistance R 10;
Described stitch 3 is connecting resistance R4 and capacitor C 5 respectively, described capacitor C 5 ground connection, and described resistance R 4 is by capacitor C 4 ground connection;
Described stitch 4 is connecting resistance R9 and capacitor C 7 respectively, described capacitor C 7 ground connection, described resistance R 9 is connecting resistance R8 and resistance R 7 successively, the negative pole of described resistance R 7 and diode D2 joins, the end of the positive pole of described diode D2 and tertiary voltage output end vo ut3 joins, 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 respectively the positive pole of diode D1 and the end of second voltage output end vo ut2, the negative pole of described diode D1 is connecting resistance R3 and capacitor C 3 respectively, described resistance R 3 is joined with second voltage input Vin2 by resistance R 2, described second voltage input Vin2 is connected with the first voltage output end Vout1, and described second voltage input Vin2 joins with the other end of capacitor C 3, second voltage output end vo ut2 respectively.
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 and second voltage output end vo ut2 join, and the primary voltage input L2 of described isolating transformer TM1 and tertiary voltage output end vo ut3 join;
The earth terminal of described isolating transformer TM1 secondary voltage output L3 and the earth terminal of primary voltage input L1 join by a capacitor C 200.
8. power supply as claimed in claim 7 is characterized in that, described synchronous rectification filter circuit includes the second integrated circuit (IC) 2, and described the second integrated circuit (IC) 2 comprises stitch 1 ~ 8;
In described the second integrated circuit (IC) 2, described stitch 1,2,4,6 ground connection, described stitch 3 is the grid G of connecting resistance R22 and power field effect pipe MOSFET Q successively, the drain D of described power field effect pipe MOSFET Q connects respectively the other end, resistance R 23 and the capacitor C 20 of described isolating transformer TM1 secondary voltage output L3, described capacitor C 20 is connecting resistance R20 and resistance R 21 respectively, described resistance R 20 and resistance R 21 ground connection; The source S of described power field effect pipe MOSFET Q is joined with resistance R 20 and resistance R 21 respectively;
Described stitch 8 is connecting resistance R23 and resistance R 24 respectively, described resistance R 24 ground connection;
Described stitch 7 is connecting resistance R25 and resistance R 26 respectively, described resistance R 26 ground connection;
Described stitch 5 connects respectively inductance L 10, electrochemical capacitor C22, resistance R 25 and capacitor C 21, described capacitor C 21 ground connection, described electrochemical capacitor C22 ground connection, the 4th voltage output end Vout4 of described inductance L 10 and described synchronous rectification filter circuit joins, and described the 4th voltage output end Vout4 is by an electrochemical capacitor C23 ground connection.
9. power supply as claimed in claim 8 is characterized in that, described two-way DC voltage-stabilizing output circuit comprises the 3rd integrated circuit (IC) 3, and described the 3rd integrated circuit (IC) 3 comprises stitch 1 ~ 8;
In described the 3rd integrated circuit (IC) 3, described stitch 1 connects respectively inductance L 20, resistance R 250, and described inductance L 20 is connected with the 5th voltage output end Vout5;
Described stitch 2 joins by capacitor C 102 and resistance R 250;
Described stitch 3 is connecting resistance R260 and resistance R 270 respectively, and described resistance R 260 is joined described resistance R 270 ground connection with tertiary voltage input Vin3;
Described stitch 4 connects respectively capacitor C 101, capacitor C 30, capacitor C 8, capacitor C 9 and tertiary voltage input Vin3, described tertiary voltage input Vin3 and the 4th voltage output end Vout4 join, described capacitor C 101 is by capacitor C 201 ground connection, described capacitor C 30 is by capacitor C 40 ground connection, described capacitor C 8 and C9 ground connection;
Described stitch 5 ground connection, described stitch 6 is connecting resistance R230 and resistance R 240 respectively, and described resistance R 230 is connected described resistance R 240 ground connection with capacitor C 220 parallel connections are rear with the 6th voltage output end Vout6;
Described stitch 7 joins with inductance L 30, and the node between described inductance L 30 and described resistance R 230 and the 6th voltage output end Vout6 joins;
Described stitch 8 connects respectively the 5th voltage output end Vout5, capacitor C 16 and capacitor C 17, and described capacitor C 16 and capacitor C 17 be ground connection respectively.
10. power supply as claimed in claim 9 is characterized in that, described the 5th voltage output end Vout5 joins with capacitor C 14, capacitor C 15 respectively, and described capacitor C 14 and capacitor C 15 be ground connection respectively;
Described the 6th voltage output end Vout6 joins with capacitor C 24, capacitor C 25 respectively, and described capacitor C 24 and capacitor C 25 be ground connection respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210548507.1A CN102983762B (en) | 2012-12-18 | 2012-12-18 | Power supply of electrical equipment |
Applications Claiming Priority (1)
| 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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| CN102983762A true CN102983762A (en) | 2013-03-20 |
| CN102983762B CN102983762B (en) | 2015-05-13 |
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| CN201210548507.1A Expired - Fee Related CN102983762B (en) | 2012-12-18 | 2012-12-18 | Power supply of electrical equipment |
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| 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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|---|---|
| CN102983762B (en) | 2015-05-13 |
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