CN103196212B - Brushless electric machine air-conditioning system indoor motor control circuit - Google Patents
Brushless electric machine air-conditioning system indoor motor control circuit Download PDFInfo
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- CN103196212B CN103196212B CN201310136592.5A CN201310136592A CN103196212B CN 103196212 B CN103196212 B CN 103196212B CN 201310136592 A CN201310136592 A CN 201310136592A CN 103196212 B CN103196212 B CN 103196212B
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Abstract
The invention discloses a kind of brushless electric machine air-conditioning system indoor motor control circuit, comprise microcontroller U4, indoor DC fan motor rotating-speed control circuit, indoor motor speed electric cut-out circuit and temperature sensing circuit; Described indoor DC fan motor rotating-speed control circuit is all connected with described microcontroller with temperature sensing circuit; Described indoor motor speed electric cuts off circuit and is connected with described indoor DC fan motor rotating-speed control circuit.Indoor motor speed electric cuts off circuit and comprises the first dividing potential drop shaping circuit, the first DC voltage testing circuit and Vsp1 voltage cut-out circuit.Brushless electric machine air-conditioning system indoor motor control circuit of the present invention, have can to any speed regulating control of indoor fan motor, better heating effect can be obtained, improve the advantages such as the safety in operation of indoor motor and reliability.
Description
Technical field
The present invention relates to a kind of brushless electric machine air-conditioning system indoor motor control circuit.
Background technology
The heating capacity of constant speed air-conditioning and the noise problem of alternating current generator annoying technical staff in the industry always, make the behaviour in service of fixed speed air conditioner not fully up to expectations.Existing fixed speed air conditioner, it is indoor, outdoor fan motor adopts AC induction motor mostly, and outdoor motor mostly is one grade of rotating speed control, although the rotating speed that stable can be had under the rated power supply of 220V, 50Hz, but along with the change of voltage, also will there is fluctuation on a large scale in its rotating speed, when causing line voltage height, outdoor motor noise is excessive; And when line voltage is low, outdoor motor rotating speed is too low, radiating effect is poor.Although minority high energy efficiency fixed speed air conditioner blower fan have employed DC brushless motor, often only outdoor fan motor adopts DC brushless motor, and it controls very simple, only provides a fixing driving voltage to direct current generator.Cause the electromagnetic sound of common fixed speed air conditioner heating effect and alternating current generator to be difficult to solve always, even if the high energy efficiency constant speed air-conditioning of above-mentioned employing DC brushless motor is also only promote to some extent in the overall efficiency of constant speed air-conditioning, and it is not fully up to expectations in heating effect, particularly high and low temperature heating effect, under high temperature heats situation, owing to have employed the method control system load opening outer blower fan, cause heating capacity to fluctuate very large, heating effect is undesirable, and waste of energy is very big.The speed of indoor motor can not realize stepless speed regulation, and heating effect is not good.And indoor motor does not arrange cut-out circuit, easily damage is caused to motor when power-off.
Summary of the invention
The present invention is for avoiding the weak point that exists in above-mentioned prior art, providing a kind of brushless electric machine air-conditioning system indoor motor control circuit, with to any speed regulating control of indoor fan motor, obtain better heating effect.
The present invention be technical solution problem by the following technical solutions.
Brushless electric machine air-conditioning system indoor motor control circuit, its design feature is, comprises microcontroller U4, indoor DC fan motor rotating-speed control circuit, indoor motor speed electric cut-out circuit and temperature sensing circuit; Described indoor DC fan motor rotating-speed control circuit is all connected with described microcontroller with temperature sensing circuit; Described indoor motor speed electric cuts off circuit and is connected with described indoor DC fan motor rotating-speed control circuit.
The design feature of brushless electric machine air-conditioning system indoor motor control circuit of the present invention is also:
Described indoor DC fan motor rotating-speed control circuit comprises resistance R1 ~ R6, electric capacity EC1 ~ EC2, electric capacity C1, phase inverter U3, photoelectrical coupler U1, photoelectrical coupler U2 and voltage-stabiliser tube Z1, the PWM output port of described microcontroller U4 is connected with the input of photoelectrical coupler U1 with resistance R4 by phase inverter U3 successively, an output of described photoelectrical coupler U1 connects+15V power supply by resistance R3, another output of described photoelectrical coupler U1 is connected to the rotational speed regulation Vsp1 mouth of indoor DC fan motor, described electric capacity C1, electric capacity EC1, the link be in parallel between resistance R1 and voltage-stabiliser tube Z1 after connecting is connected between the rotational speed regulation Vsp1 mouth of indoor DC fan motor and photoelectrical coupler U1, described electric capacity C1, electric capacity EC1, another link ground connection be in parallel between resistance R1 and voltage-stabiliser tube Z1 after connecting, the speed feedback mouth FG1 of described indoor DC fan motor is connected with an input of described photoelectrical coupler U2, and another input of described photoelectrical coupler U2 connects+15V power supply by resistance R2, an output of described photoelectrical coupler U2 is connected with microcontroller U4 by resistance R5, described resistance R6 and electric capacity EC2 be in parallel connect after one end be connected between resistance R5 and microcontroller U4, the other end ground connection after described resistance R6 and electric capacity EC2 are in parallel and are connected.
Described indoor motor speed electric cuts off circuit and comprises the first dividing potential drop shaping circuit, the first DC voltage testing circuit and Vsp1 voltage cut-out circuit; First dividing potential drop shaping circuit is made up of resistance R21, resistance R22 and electric capacity EC8; First DC voltage testing circuit comprises voltage-stabiliser tube Z3, resistance R23 and triode Q2; Vsp1 voltage cuts off circuit and comprises resistance R24 ~ R26, switch triode Q3, and wherein switch triode Q3 cuts off the executive component of circuit as Vsp1 voltage.
Described temperature sensing circuit comprises thermistor RT1, divider resistance R33 and commutation capacitor EC10; One end of described thermistor RT1 connects+5V power supply, and the other end of described thermistor RT1 connects microcontroller U4; Described divider resistance R33 and commutation capacitor EC10 be in parallel connect after one end be connected between described thermistor RT1 and microcontroller U4, the other end ground connection after described divider resistance R33 and commutation capacitor EC10 are in parallel and are connected.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1) brushless electric machine air-conditioning system indoor motor control circuit of the present invention, owing to have employed DC brushless motor to indoor fan motor, and is provided with rotating-speed control circuit, and by closed-loop control, make motor speed control stable and not influence by voltage, noise is little; High temperature heats, under low-temperature heating operating mode, the heating effect of air-conditioner is better.
2) brushless electric machine air-conditioning system indoor motor control circuit of the present invention; circuit is cut off owing to being provided with indoor motor speed electric Vsp1; apply in motor Vdm1 and Vcc1 voltage after making Vsp1 voltage; cut off prior to motor Vdm1 and Vcc1 voltage; solve common air-conditioning DC motor control circuit simple; the flimsy disadvantage of motor, can protect indoor motor better, improves safety in operation and the reliability of indoor motor.
4) brushless electric machine air-conditioning system indoor motor control circuit of the present invention, air-conditioning system is had noise is low, heating effect is good advantage, working stability is reliable, widening of the produce market that is highly advantageous to.
Brushless electric machine air-conditioning system indoor motor control circuit of the present invention, have employed DC brushless motor, to any speed regulating control of indoor fan motor, can obtain better heating effect; Can also protect indoor fan motor when power-off, improve safety in operation and the reliability of indoor motor.
Accompanying drawing explanation
Fig. 1 is the structural representation of DC brushless motor air-conditioning system of the present invention.
Fig. 2 is indoor DC fan motor rotating-speed control circuit schematic diagram of the present invention.
Fig. 3 is outdoor DC fan motor rotating-speed control circuit schematic diagram A(first circuit unit of air-conditioning system of the present invention).
Fig. 4 is the outdoor DC fan motor rotating-speed control circuit schematic diagram B(second circuit unit of air-conditioning system of the present invention).
Fig. 5 is the outdoor direct current generator fixed rotating speed of air-conditioning system of the present invention and adjustable rotating speed commutation circuit schematic diagram.
Fig. 6 is that the indoor motor speed electric Vsp1 of air-conditioning system of the present invention cuts off circuit theory diagrams.
Fig. 7 is that the outdoor motor speed electric Vsp2 of air-conditioning system of the present invention cuts off circuit theory diagrams.
Fig. 8 is the temperature sensing circuit schematic diagram of the indoor coil of air-conditioning system of the present invention.
Fig. 9 is the overall control circuit schematic diagram of air-conditioning system of the present invention.
Figure 10 is the conversion chart of the outdoor motor temperature-rotation speed relation of air-conditioning system of the present invention.
Label in Fig. 1 ~ Figure 10: 1 compressor, 2 outdoor unit heat exchangers, 3 aerofoil fans, 4 indoor set heat exchangers, 5 first capillaries, 6 axial-flow fans, 7 cross valves, 8 electric heaters, 9 gas-liquid separators, 10 check valves, 11 first stop valves, 12 second stop valves, 13 second capillaries.
Below by way of detailed description of the invention, and the invention will be further described by reference to the accompanying drawings.
Detailed description of the invention
See Fig. 9, brushless electric machine air-conditioning system indoor motor control circuit, is characterized in that, comprises microcontroller U4, indoor DC fan motor rotating-speed control circuit, indoor motor speed electric cut-out circuit and temperature sensing circuit; Described indoor DC fan motor rotating-speed control circuit is all connected with described microcontroller with temperature sensing circuit; Described indoor motor speed electric cuts off circuit and is connected with described indoor DC fan motor rotating-speed control circuit.
DC brushless motor air-conditioning system comprises indoor set, off-premises station and control circuit, its control circuit, comprises microcontroller U4, brushless electric machine air-conditioning system indoor motor control circuit of the present invention, outdoor DC fan motor rotating-speed control circuit, outdoor direct current generator fixed rotating speed and adjustable rotating speed commutation circuit, outdoor motor speed electric and cuts off the circuit such as circuit.The schematic diagram of indoor set and off-premises station as shown in Figure 1.Described indoor set comprises indoor set heat exchanger 4, electric heater 8 and axial-flow fan 6; One end of described indoor set heat exchanger 4 is connected with the first stop valve 11, and the other end of described indoor set heat exchanger 4 is connected with the second stop valve 12;
Described off-premises station comprises outdoor unit heat exchanger 2, compressor 1, aerofoil fan 3, first capillary 5, cross valve 7, gas-liquid separator 9 and check valve 10; Described compressor 1 is connected with the first port of described cross valve 7, second port of described cross valve 7 is connected with described first stop valve 11,3rd port of described cross valve 7 is connected with described gas-liquid separator 9,4th port of described cross valve 7 is connected with one end of described outdoor unit heat exchanger 2, the other end of described outdoor unit heat exchanger 2 is connected with one end of described first capillary 5, the other end of described first capillary 5 is connected with one end of described check valve 10, and the other end of described check valve 10 is connected with described second stop valve 12; The side of described outdoor unit heat exchanger 2 is provided with aerofoil fan 3; The motor of described axial-flow fan 6 and the motor of described aerofoil fan 3 are brshless DC motor; The motor of the motor of the axial-flow fan 6 of described indoor set and the aerofoil fan 3 of described off-premises station is controlled by two pieces of control panels respectively.
Described off-premises station also comprises the second capillary 13; Described check valve 10 is in parallel with the second capillary 13 and is connected.If Fig. 1 is a kind of air-conditioning system applying DC brushless motor of the present utility model, be made up of indoor set, off-premises station, refrigeration system and corresponding control circuit.During refrigeration, the low pressure in refrigeration system, low-temperature refrigerant steam are sucked by compressor 1, drain into outdoor unit heat exchanger 2 after the compressed superheated steam for high pressure, high temperature; The outdoor air that simultaneously outside fan 3 sucks flows through outdoor unit heat exchanger 2, takes away cold-producing medium liberated heat, makes high pressure, the refrigerant vapour of high temperature is condensed into highly pressurised liquid.Highly pressurised liquid flows into indoor set heat exchanger 4 through the first capillary 5 step-down cooling, and evaporates under corresponding low pressure, draws ambient heat; Carry out heat exchange between the fin that simultaneously indoor fan 6 makes room air constantly enter indoor set heat exchanger 4, and the gas turned cold after heat release is sent to indoor.So, indoor-outdoor air constantly circulates, and reaches the object reducing temperature.When heating, the compression condensation heat of refrigeration system is utilized to carry out heating indoor air, low pressure, low-temperature refrigerant liquid evaporation endothermic in evaporimeter, and high-temperature high-pressure refrigerant gas exothermic condensation in condenser.Changed the loop direction of cold-producing medium by cross valve 7 when heat pump heats, condenser when heating is become as the indoor set heat exchanger of evaporimeter when making original refrigeration work, originally become evaporimeter when heating as the outdoor unit heat exchanger of condenser during refrigeration work, such refrigeration system is in outdoor heat absorption, indoor heat release, realizes the object heated.Electric heater 8 is for as assisted heating device.
Indoor, outdoor fan all adopts DC brushless motor, is controlled respectively by two pieces of control panels, and by closed-loop control, make motor speed control stable and not influence by voltage, noise is little; High temperature heats, under low-temperature heating operating mode, the heating effect of air-conditioner is better.Outdoor motor adopts independent control circuit, and the fixed rotating speed of outdoor motor and adjustable rotating speed can arbitrarily be switched, again can when closed loop rotation speed control loop damages, and outdoor fan continues normal work.
Have employed DC brushless motor, to any speed regulating control of indoor fan motor, better heating effect can be obtained; Indoor motor speed electric cuts off circuit and can protect indoor fan motor when power-off, improves safety in operation and the reliability of indoor motor.
Described indoor DC fan motor rotating-speed control circuit comprises resistance R1 ~ R6, electric capacity EC1 ~ EC2, electric capacity C1, phase inverter U3, photoelectrical coupler U1, photoelectrical coupler U2 and voltage-stabiliser tube Z1, the PWM output port of described microcontroller U4 is connected with the input of photoelectrical coupler U1 with resistance R4 by phase inverter U3 successively, an output of described photoelectrical coupler U1 connects+15V power supply by resistance R3, another output of described photoelectrical coupler U1 is connected to the rotational speed regulation Vsp1 mouth of indoor DC fan motor, described electric capacity C1, electric capacity EC1, the link be in parallel between resistance R1 and voltage-stabiliser tube Z1 after connecting is connected between the rotational speed regulation Vsp1 mouth of indoor DC fan motor and photoelectrical coupler U1, described electric capacity C1, electric capacity EC1, another link ground connection be in parallel between resistance R1 and voltage-stabiliser tube Z1 after connecting, the speed feedback mouth FG1 of described indoor DC fan motor is connected with an input of described photoelectrical coupler U2, and another input of described photoelectrical coupler U2 connects+15V power supply by resistance R2, an output of described photoelectrical coupler U2 is connected with microcontroller U4 by resistance R5, described resistance R6 and electric capacity EC2 be in parallel connect after one end be connected between resistance R5 and microcontroller U4, the other end ground connection after described resistance R6 and electric capacity EC2 are in parallel and are connected.Be connected by plug connector CN1 between described indoor DC fan motor MOTOR1 and described indoor DC fan motor rotating-speed control circuit, described CN1 includes the splicing ears such as Vdm1, GND1, Vcc1, Vsp1 and FG1.
As shown in Figure 2, indoor DC fan motor rotating-speed control circuit, is made up of speed feedback circuit and motor-drive circuit.The element composition such as speed feedback electricity routing resistance R2, R5, R6, photoelectrical coupler U2 and electric capacity EC2.Motor-drive circuit comprises the element compositions such as R1, R3, R4, photoelectrical coupler U1, electric capacity EC1, electric capacity C1, phase inverter U3 and voltage-stabiliser tube Z1.
Described speed feedback circuit is using the built-in Hall element of indoor DC fan motor as motor speed detection signal, sampled to photoelectrical coupler U2 input by the FG1 mouth of the plug connector CN1 of indoor DC fan motor, export through photoelectrical coupler U2, form signal transformation circuit via resistance R5, R6, electric capacity EC2 and be input to microcontroller U4.Using phase inverter U3 and photoelectrical coupler U1 as the executive component controlling motor speed.Microcontroller U4, according to the tach signal detected, adjusts the output to the pulse signal frequency of phase inverter U3 in real time.The pulse that photoelectrical coupler U1 exports via the signal transformation circuit of resistance R1, electric capacity EC1, C1 composition, forms stable motor driven voltage Vsp1, is applied on indoor motor MOTOR1 again.
The PWM output port of microcontroller U4 first exports the pwm pulse waveform of a little dutycycle, through phase inverter U3, exported by photoelectrical coupler U1, the DC voltage forming certain amplitude after resistance R1, electric capacity EC1, C1 shaping filter is added to the rotational speed regulation Vsp1 mouth of indoor motor MOTOR1, and arranges voltage-stabiliser tube Z1 to prevent Vsp1 overtension damage motor at Vsp1 mouth.When after indoor fan motor running, the Hall element HALL of electric machine built-in exports 12 pulses/turn, send into speed feedback mouth FG1, again through photoelectrical coupler U2 isolation and amplifier, square wave is shaped as by resistance R5, R6, electric capacity EC2, send into microcontroller U4 external interrupt mouth, microcontroller U4 counts the pulse sent into, thus realizes the measurement to wind speed.And compare to the umber of pulse of the corresponding rotating speed of microcontroller U4 inner setting, the dutycycle of adjustment PWM ripple.Can the magnitude of voltage of control Vsp1 mouth by the change of dutycycle, thus the rotating speed of motor M OTOR1 in control room.
Described indoor motor speed electric cuts off circuit and comprises the first dividing potential drop shaping circuit, the first DC voltage testing circuit and Vsp1 voltage cut-out circuit; First dividing potential drop shaping circuit is made up of resistance R21, resistance R22 and electric capacity EC8; First DC voltage testing circuit comprises voltage-stabiliser tube Z3, resistance R23 and triode Q2; Vsp1 voltage cuts off circuit and comprises resistance R24 ~ R26, switch triode Q3, and wherein switch triode Q3 cuts off the executive component of circuit as Vsp1 voltage.
Fig. 6 is that indoor motor MOTOR1 speed electric Vsp1 cuts off circuit, forms the first dividing potential drop shaping circuit, via voltage-stabiliser tube Z3, triode Q2 conduct+310V voltage detector component by resistance R21, R22 and electric capacity EC8.The executive component of circuit is cut off using switch triode Q3 as Vsp1 voltage.During prominent chance power-off, before Vdm1 and the Vcc1 voltage of motor M OTOR1 cuts off, first cut off Vsp1 voltage, to protect indoor direct current generator MOTOR1 not damaged.
Described temperature sensing circuit comprises thermistor RT1, divider resistance R33 and commutation capacitor EC10; One end of described thermistor RT1 connects+5V power supply, and the other end of described thermistor RT1 connects microcontroller U4; Described divider resistance R33 and commutation capacitor EC10 be in parallel connect after one end be connected between described thermistor RT1 and microcontroller U4, the other end ground connection after described divider resistance R33 and commutation capacitor EC10 are in parallel and are connected.
Fig. 8 is temperature sensing circuit, arranges the coil temperature sensor RT1 of indoor machine evaporation, using the temperature detection signal of described coil temperature sensor RT1 as the changeover control signal of outdoor motor different rotating speeds shelves.
Fig. 2 and Fig. 6 constitutes complete indoor motor MOTOR1 control circuit, and the A node in Fig. 2 is connected with the A node in Fig. 6.In air-conditioning normally runs, during the situation of meeting power-off of dashing forward, due to the characteristic of Switching Power Supply, the Vcc1 voltage of indoor motor MOTOR1 and the Vc voltage of microcontroller U4 all can keep just disappearing for several seconds, and the Vdm1 voltage of indoor motor MOTOR1 can slowly decline, in these several seconds, decline due to Vdm1 causes the rotating speed of indoor motor MOTOR1 to decline, thus the umber of pulse of the feedback of indoor motor MOTOR1 reduces to make microcontroller U4 detect, microcontroller U4 can strengthen the dutycycle exporting PWM ripple, Vsp1 voltage is caused to raise, abnormal duty very likely causes the driver module of direct current generator MOTOR1 inside to damage.And cut off circuit by arranging motor M OTOR1 speed electric Vsp1, can effective head it off.When Vdm1 voltage+310V is normal, resistance R21, R22 and electric capacity EC8 form dividing potential drop shaping circuit, and make voltage-stabiliser tube Z3, triode Q2 conducting, triode Q3 ends, and does not affect Vsp1 voltage, does not affect the normal work of motor.And in power-off, when+310V voltage drop to a certain extent time, during the voltage stabilizing value of the voltage that resistance R22 gets lower than voltage-stabiliser tube Z3, triode Q2 ends, triode Q3 saturation conduction, before the Vcc1 voltage of motor M OTOR1 and the Vc voltage dead electricity of microcontroller U4, Vsp1 mouth voltage is because of triode Q3 saturation conduction, voltage drop to 0V, thus ensures that direct current generator MOTOR1 is not damaged.
DC brushless motor Air-condition system control circuit, comprises microcontroller U4, brushless electric machine air-conditioning system indoor motor control circuit of the present invention, outdoor DC fan motor rotating-speed control circuit, outdoor direct current generator fixed rotating speed and adjustable rotating speed commutation circuit, outdoor motor speed electric and cuts off the circuit such as circuit.Described indoor DC fan motor rotating-speed control circuit, outdoor DC fan motor rotating-speed control circuit are all connected with described microcontroller with temperature sensing circuit; Described indoor motor speed electric cuts off circuit and is connected with described indoor DC fan motor rotating-speed control circuit, and described outdoor motor speed electric cuts off circuit and is all connected with described outdoor DC fan motor rotating-speed control circuit with adjustable rotating speed commutation circuit with outdoor direct current generator fixed rotating speed;
Described outdoor DC fan motor rotating-speed control circuit comprises the first circuit unit and second circuit unit, and described first circuit unit comprises plug connector CN2, and described second circuit unit comprises plug connector CN4;
The circuit board of described DC brushless motor Air-condition system control circuit is divided into outdoor control panel and indoor control panel; First circuit unit of described microcontroller U4, indoor DC fan motor rotating-speed control circuit, outdoor DC fan motor rotating-speed control circuit, indoor motor speed electric cut off circuit and temperature sensing circuit is arranged on described indoor control panel, and the second circuit unit of described outdoor DC fan motor rotating-speed control circuit, outdoor direct current generator fixed rotating speed and adjustable rotating speed commutation circuit and outdoor motor speed electric cut off circuit and be arranged on described outdoor control panel; Be connected with plug connector CN4 by plug connector CN2 between described outdoor control panel and indoor control panel.
As the integrated circuit figure that Fig. 9 is control circuit, the circuit diagram of Fig. 9 combines the circuit diagram of Fig. 2 ~ Fig. 8, and the circuit board of this control circuit is separated into two pieces of control panels: one piece of indoor control panel and one piece of outdoor control panel.Indoor, outdoor fan motor are all adopted to DC brushless motor, and be provided with rotating-speed control circuit.When system only needs outdoor motor adopt direct current generator and only need a fixed rotating speed, in original control system, increase such one piece of outdoor control panel again, without the need to doing any change to former control system, and have employed adjustable resistance ZW1 due to outdoor motor fixed partial pressure resistance, make it be applicable to the system of any rotation speed requirements.And when after the indoor control panel added so outdoor control panel in the present invention and respective gut, the control of closed loop rotating speed can be carried out to outdoor motor.Because the fixed rotating speed of outdoor motor control circuit and adjustable rotating speed can arbitrarily switch, again can when closed loop rotation speed control loop damage, outdoor fan continues normal work.Solve the predicament of the corresponding a kind of new motor of common fixed speed air conditioner system requirements, applicability and the composability of the control circuit that this invent are strengthened greatly, greatly shorten product development cycle, raising heating effect and job stability and reliability.
First circuit unit of described outdoor DC fan motor rotating-speed control circuit also comprises photoelectrical coupler U5, photoelectrical coupler U6, resistance R7 ~ R9, phase inverter U3 and electric capacity EC3; The output of described photoelectrical coupler U5 is connected with the terminal Vsp of described plug connector CN2, and the input of described photoelectrical coupler U5 is connected on the PWM output port of microcontroller U4 by resistance R7 and phase inverter U3 successively; Two inputs of described photoelectrical coupler U6 are connected with terminal OUT-with the terminal FG of described plug connector CN2 respectively, and the output of described photoelectrical coupler U6 is connected with microcontroller U4 by resistance R8; Described resistance R9 and electric capacity EC3 be in parallel connect after one end be connected between resistance R8 and microcontroller U4, the other end ground connection after described resistance R9 and electric capacity EC3 are in parallel and are connected;
The second circuit unit of described outdoor DC fan motor rotating-speed control circuit also comprises resistance R11 ~ R16, electric capacity EC4, electric capacity C2, photoelectrical coupler U7, photoelectrical coupler U8 and voltage-stabiliser tube Z2, and the second circuit unit of described outdoor DC fan motor rotating-speed control circuit is connected with described outdoor DC fan motor MOTOR2 by plug connector CN3; The terminal Vsp of described plug connector CN4 is connected with the input of photoelectrical coupler U7 by resistance R16, an output of described photoelectrical coupler U7 connects+15V power supply by resistance R14, and another output of described photoelectrical coupler U7 is connected to the rotational speed regulation Vsp2 mouth of outdoor DC fan motor; Described electric capacity C2, electric capacity EC4, the link after connecting that is in parallel between resistance R11 and voltage-stabiliser tube Z2 are connected between the rotational speed regulation Vsp2 mouth of indoor DC fan motor and photoelectrical coupler U7, another link ground connection after described electric capacity C2, electric capacity EC4, the connection that is in parallel between resistance R11 and voltage-stabiliser tube Z2; The speed feedback mouth FG1 of described indoor DC fan motor is connected with an input of photoelectrical coupler U8 by resistance R13, and another input of described photoelectrical coupler U8 connects+15V power supply; One end of described resistance R12 connects+15V power supply, and the other end of described resistance R12 is connected between the speed feedback mouth FG1 of described indoor DC fan motor and described resistance R13; An output of described photoelectrical coupler U8 connects+15V power supply by resistance R15, and another output of described photoelectrical coupler U8 is connected with the terminal FG of described plug connector CN4.
As Fig. 3, Fig. 4 are respectively two circuit units of outdoor DC fan motor rotating-speed control circuit, these two circuit units together constitute outdoor motor rotating-speed control circuit, its basic control principle is identical with the general principle of above-mentioned indoor DC fan motor rotating-speed control circuit, and circuit structure is also similar.Better applicability is obtained in order to make the present invention, and outdoor motor control circuit is divided into indoor (i.e. the first circuit unit, shown in Fig. 3), outdoor (i.e. second circuit unit, shown in Fig. 4) two parts, after the respective terminal of the plug connector of two circuit units is connected by wire, can the connection of realizing circuit.
The plug connector CN2 of described first circuit unit and described second circuit unit comprise plug connector CN4 and include 4 terminals: Vsp, FG, OUT-and IN-.The terminal of the same names of these two plug connectors is connected by wire, connector CN2 with CN4 can be connected, thus outdoor control panel can be connected with indoor control panel.Outdoor DC fan motor rotating-speed control circuit, using can photoelectrical coupler U6, U8 of Isolation input output as the sampling element of outdoor motor tach signal, using can photoelectrical coupler U5, U7 of Isolation input output as the performer of rotating speed controlling outdoor motor MOTOR2.
Described plug connector CN3 also comprises terminal Vdm2 and terminal GND2; Described terminal Vdm2 is connected with+310V power supply with fuse F1 by diode D1 successively, and described terminal GND2 is connected with+310V power supply with resistance R10 by LED 1 successively.Outdoor motor MOTOR2 can be shown by LED 1 whether to switch on power, by fuse F1, protection be implemented to outdoor motor MOTOR2.
Described outdoor direct current generator fixed rotating speed and adjustable rotating speed commutation circuit comprise fixed partial pressure circuit and fixed partial pressure point deenergizing; Described fixed partial pressure circuit comprises resistance R17, adjustable resistance ZW1, electric capacity EC6 and PNP type triode Q1; A described fixed partial pressure point deenergizing comprises photoelectrical coupler U9; Described triode Q1 connects+15V power supply by resistance R17, is somebody's turn to do an electrochemical capacitor EC5 in parallel between+15V power supply and triode Q1 base stage; One end after described adjustable resistance ZW1 and electric capacity EC6 is connected in parallel is connected between resistance R17 and triode Q1, the other end ground connection after described adjustable resistance ZW1 and electric capacity EC6 is connected in parallel.
Fig. 5 is outdoor direct current generator fixed rotating speed and adjustable rotating speed commutation circuit, is made up of fixed partial pressure circuit and a fixed partial pressure point deenergizing.Described fixed partial pressure electricity routing resistance R17, adjustable resistance ZW1, electric capacity EC6, PNP type triode Q1 composition; The executive component of deenergizing is divided using photoelectrical coupler U9 as fixed partial pressure.An electrochemical capacitor EC5 in parallel between+15V power end and triode Q1 base stage, make when switching on power, the motor driven voltage that fixed partial pressure circuit is exported slowly is applied on outdoor motor MOTOR2, to avoid damaging motor.
Described outdoor motor speed electric cuts off circuit and comprises the second dividing potential drop shaping circuit, the second DC voltage testing circuit and Vsp2 voltage cut-out circuit; Second dividing potential drop shaping circuit is made up of resistance R27, resistance R28 and electric capacity EC9; Second DC voltage testing circuit comprises voltage-stabiliser tube Z4, resistance R29 and triode Q4; Vsp2 voltage cuts off circuit and comprises resistance R30 ~ R32, switch triode Q5, and wherein switch triode Q5 cuts off the executive component of circuit as Vsp2 voltage.
Fig. 7 is that outdoor motor MOTOR2 speed electric Vsp2 cuts off circuit, and its basic control principle is with indoor DC fan motor rotating-speed control circuit.Via voltage-stabiliser tube Z4, triode Q4 conduct+310V voltage detector component.The executive component of circuit is cut off using switch triode Q5 as Vsp2 voltage.During prominent chance power-off, before Vdm2 and the Vcc2 voltage of outdoor motor MOTOR2 cuts off, first cut off Vsp2 voltage, to protect outdoor direct current generator MOTOR2 not damaged.
Fig. 3, Fig. 4, Fig. 5, Fig. 7 constitute the control circuit of complete outdoor motor MOTOR2, and wherein the power supply of outdoor control panel is controlled by the outer blower fan signal control relay of indoor control panel, docks with common electric-controlled plate to facilitate.CN4 in CN2 and Fig. 4 in Fig. 3 has corresponding terminal, two parts circuit diagram can be linked together after being connected by corresponding terminal, and in figure, two Node B are connected, and three node C are connected, and form complete circuit diagram, as shown in Figure 9.
After outdoor control panel powers on, when the connector CN2 of indoor control panel is not connected with the connector CN4 on outdoor control panel, then the bleeder circuit output voltage that forms via resistance R17, adjustable resistance ZW1, electric capacity EC6 of+15V voltage is to the emitter-base bandgap grading of PNP type triode Q1, the base stage of triode Q1 is by resistance R18, R19 and electric capacity EC7 ground connection, PN junction positively biased, triode Q1 conducting, the voltage that bleeder circuit is got is added to the Vsp2 mouth of outdoor motor MOTOR2, and motor M OTOR2 is operated by a fixed rotating speed.+ 15V is slowly charged to electric capacity EC5 by resistance R18, R19; make triode Q1 slowly conducting; the voltage being applied to Vsp2 mouth slowly increases; thus motor M OTOR2 is slowly at the uniform velocity started; the setting of electric capacity EC5; Vdm2 and Vcc2 voltage in motor M OTOR2 after making Vsp2 voltage applies, and meets the control overflow of direct current generator, can available protecting direct current generator MOTOR2 not damaged.The setting of adjustable resistance ZW1, can make outdoor control panel adapt to the rotating speed of arbitrary system requirements, and need not redesign control panel and motor.
After the connector CN2 of indoor control panel is connected connection with the connector CN4 on outdoor control panel, the pwm pulse waveform of the PWM mouth output of microcontroller U4, the 2nd pin (shown in Fig. 3) of photoelectrical coupler U5 is connected to through phase inverter U3, R7, optocoupler U5 the 3rd pin exports and is connected to shown in U9(Fig. 5 through R16) the 1st pin, export from U9 the 3rd pin, charge to electric capacity EC7, make the base voltage of triode Q1 higher than emitter voltage, PN junction is reverse-biased, triode Q1 ends, and has cut off the Vsp2 fixed partial pressure circuit of outdoor motor MOTOR2.
Simultaneously, the pwm pulse waveform of the PWM mouth output of microcontroller U4, through phase inverter U3, R7 is connected to the 2nd pin (shown in Fig. 3) of photoelectrical coupler U5, optocoupler U5 the 3rd pin exports and is connected to shown in U7(Fig. 4 through R16) the 1st pin, export from U7 the 3rd pin, resistance R11, electric capacity EC4, shown in C2(Fig. 4) DC voltage that forms certain amplitude after shaping filter is added to the rotational speed regulation Vsp2 mouth of outdoor motor MOTOR2, and at Vsp2 mouth, voltage-stabiliser tube Z2 is set to prevent Vsp2 overtension damage motor, after outdoor fan motor MOTOR2 operates, the built-in Hall element HALL of motor M OTOR2 exports 12 pulses/turn, send into speed feedback mouth FG2, again through shown in photoelectrical coupler U8(Fig. 4), shown in U6(Fig. 3) isolation and amplifier, by resistance R8, R9, shown in electric capacity EC3(Fig. 3) be shaped as square wave, send into microcontroller U4 external interrupt mouth, microcontroller U4 counts the pulse sent into, carry out the measurement of the rotating speed of outdoor fan motor MOTOR2, thus the measurement realized the wind speed of outdoor fan.The umber of pulse of the rotating speed of outdoor fan motor MOTOR2 to the corresponding rotating speed of microcontroller U4 inner setting is compared, the dutycycle of adjustment PWM ripple.Can the magnitude of voltage of control Vsp2 mouth by the change of dutycycle, thus the rotating speed of control room external fan motor M OTOR2.Shown in Fig. 7, electric machine speed regulation voltage Vsp2 cuts off circuit, during power-off, before Vdm2 and the Vcc2 voltage of motor cuts off, first cuts off Vsp2 voltage, to protect direct current generator MOTOR2 not damaged.
According to Fig. 8, by arranging coil temperature sensor on indoor set heat exchanger, 5V voltage by NTC thermistor and R33 dividing potential drop, EC10 shaping, voltage stabilizing, the change of NTC thermistor RT1 resistance is converted to voltage change, exports the AD mouth of d. c. voltage signal to microcontroller U4.Microcontroller U4, by the AD conversion to this voltage, the change gathering perception indoor heat exchanger temperature, in air-conditioning heating situation, when heat exchange temperature changes, according to the temperature-rotating speed transformational relation table of Figure 10, controls the rotating speed of outdoor motor.When temperature is raised, when being more than or equal to T3, outdoor fan rotating speed lowers one grade, and to SP3, when being more than or equal to T5, outdoor fan rotating speed lowers one grade again, and to SP2, when being more than or equal to T6, outdoor fan rotating speed is adjusted to SP1; Upon a drop in temperature, when being less than T4, outdoor fan rotating speed raises one grade, and to SP2, when being less than T2, outdoor fan rotating speed raises one grade again, and to SP3, when being less than T1, outdoor fan rotating speed is adjusted to SP4.
In temperature ramp de, if when being more than or equal to T7, for preventing compressor because of high load capacity " chaser ", then turn off the power supply of outdoor control panel, once after turning off the power supply of outdoor control panel, it is the time declined to system loading one, then when needing control temperature to drop to be less than or equal to T1, allow outdoor control panel again again electric, repeat above-mentioned blast velocity control process.
In concrete enforcement, more gear outdoor motor rotating speed can also be set again, according to variations in temperature, when low-temperature heating, promote rotating speed, when high temperature, reduce rotating speed.To reach when promoting low-temperature heating total effectively heats the time, promotes the object of heating capacity when high temperature heats.
In Split wall-mounted type air conditioner KFRd-32GW/051-N1, KFRd-32GW/052-N1, KFRd-32GW/053-N1, KFRd-32GW/054-N1(1 level efficiency, when EER=3.6) type being tested, indoor display adopts LED module, LED two kinds of display modes respectively.Experimentally, refrigeration system uses original KFRd-32GW/054-E1(2 level efficiency, EER=3.4) system, do not do to change.During normal work, outdoor motor MOTOR2 rotating speed is arranged on 820 revs/min, indoor fan MOTOR1, outdoor fan MOTOR2 all adopt DC brushless motor, adopt indoor, outdoor two pieces of control panels, outdoor control panel is powered by the outer blower fan control relay of indoor control panel, outdoor motor MOTOR2 carries out closed-loop control by indoor control panel, after damaging for preventing closed-loop control circuit, air-conditioning cisco unity malfunction, adjust the adjustable resistance ZW1 in fixed partial pressure circuit, reach certain Vsp2 voltage, make fixed rotating speed be 820 revs/min.
In heating operations, when temperature is raised, when being more than or equal to 44 DEG C, outdoor fan rotating speed lowers one grade, to 720 revs/min; When being more than or equal to 46 DEG C, outdoor fan MOTOR2 rotating speed lowers one grade again, to 500 revs/min; When being more than or equal to 46 DEG C, outdoor fan MOTOR2 rotating speed is adjusted to 300 revs/min; Upon a drop in temperature, when being less than 45 DEG C, outdoor fan MOTOR2 rotating speed raises one grade, to 500 revs/min; When being less than 43 DEG C, outdoor fan MOTOR2 rotating speed raises one grade again, to 700 revs/min; When being less than 41 DEG C, outdoor fan MOTOR2 rotating speed is adjusted to 820 revs/min.
In temperature ramp de, if when being more than or equal to 50 DEG C, for preventing compressor because of high load capacity " chaser ", then turn off the power supply of outdoor control panel, once after turning off the power supply of outdoor control panel, it is the time declined to system loading one, then when needing control temperature to drop to be less than or equal to 41 DEG C, allow outdoor control panel again again electric, repeat above-mentioned blast velocity control process.
Test proves, on the basis of former KFRd-32GW/054-E1 system, directly trapped energy theory is risen to more than 3.6, and when maximum heating capacity is heated high load capacity by original average heating capacity 3200W(, outer blower fan frequent start-stop, causes heating capacity to fluctuate) bring up to 4600W.COP when high temperature heats is by originally significantly improve winter heating's performance and environmental suitability.Product cost with do not adopt the KFRd-32GW/05-N1 type cost of direct current generator suitable, but reduce the volume of outer machine, decrease the consumption such as copper, aluminium, all have very large improvement at packaging, cost of transportation, noise, aspect of performance.Marketing, respond well.
The invention is not restricted to the above description to embodiment, the content that those skilled in the art disclose according to the present invention, the improvement that basis of the present invention need not be carried out through creative work and amendment all should within protection scope of the present invention.
Claims (3)
1. brushless electric machine air-conditioning system indoor motor control circuit, is characterized in that, comprises microcontroller U4, indoor DC fan motor rotating-speed control circuit, indoor motor speed electric cut-out circuit and temperature sensing circuit; Described indoor DC fan motor rotating-speed control circuit is all connected with described microcontroller with temperature sensing circuit; Described indoor motor speed electric cuts off circuit and is connected with described indoor DC fan motor rotating-speed control circuit;
Described indoor DC fan motor rotating-speed control circuit comprises resistance R1 ~ R6, electric capacity EC1 ~ EC2, electric capacity C1, phase inverter U3, photoelectrical coupler U1, photoelectrical coupler U2 and voltage-stabiliser tube Z1, the PWM output port of described microcontroller U4 is connected with the input of photoelectrical coupler U1 with resistance R4 by phase inverter U3 successively, an output of described photoelectrical coupler U1 connects+15V power supply by resistance R3, another output of described photoelectrical coupler U1 is connected to the rotational speed regulation Vsp1 mouth of indoor DC fan motor, described electric capacity C1, electric capacity EC1, the link be in parallel between resistance R1 and voltage-stabiliser tube Z1 after connecting is connected between the rotational speed regulation Vsp1 mouth of indoor DC fan motor and photoelectrical coupler U1, described electric capacity C1, electric capacity EC1, another link ground connection be in parallel between resistance R1 and voltage-stabiliser tube Z1 after connecting, the speed feedback mouth FG1 of described indoor DC fan motor is connected with an input of described photoelectrical coupler U2, and another input of described photoelectrical coupler U2 connects+15V power supply by resistance R2, an output of described photoelectrical coupler U2 is connected with microcontroller U4 by resistance R5, described resistance R6 and electric capacity EC2 be in parallel connect after one end be connected between resistance R5 and microcontroller U4, the other end ground connection after described resistance R6 and electric capacity EC2 are in parallel and are connected.
2. brushless electric machine air-conditioning system indoor motor control circuit according to claim 1, is characterized in that, described indoor motor speed electric cuts off circuit and comprises the first dividing potential drop shaping circuit, the first DC voltage testing circuit and Vsp1 voltage cut-out circuit; First dividing potential drop shaping circuit is made up of resistance R21, resistance R22 and electric capacity EC8; First DC voltage testing circuit comprises voltage-stabiliser tube Z3, resistance R23 and triode Q2; Vsp1 voltage cuts off circuit and comprises resistance R24 ~ R26, switch triode Q3, and wherein switch triode Q3 cuts off the executive component of circuit as Vsp1 voltage.
3. brushless electric machine air-conditioning system indoor motor control circuit according to claim 1 and 2, it is characterized in that, described temperature sensing circuit comprises thermistor RT1, divider resistance R33 and commutation capacitor EC10; One end of described thermistor RT1 connects+5V power supply, and the other end of described thermistor RT1 connects microcontroller U4; Described divider resistance R33 and commutation capacitor EC10 be in parallel connect after one end be connected between described thermistor RT1 and microcontroller U4, the other end ground connection after described divider resistance R33 and commutation capacitor EC10 are in parallel and are connected.
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| CN105024597A (en) * | 2014-04-21 | 2015-11-04 | 深圳创动科技有限公司 | Direct current fan voltage control circuit |
| CN105024592B (en) * | 2014-04-25 | 2017-11-10 | 中山大洋电机股份有限公司 | A kind of BLDC electrical faults State Feedback Approach and application BLDC motors, air-conditioning system |
| CN104154604B (en) * | 2014-08-20 | 2017-01-18 | 中国扬子集团滁州扬子空调器有限公司 | Outdoor unit control circuit of variable frequency air conditioner |
| CN105159330A (en) * | 2015-09-01 | 2015-12-16 | 东北师范大学 | Automatic adjusting apparatus of high-voltage polar plate interval |
| CN105841281B (en) * | 2016-05-20 | 2019-07-16 | 海信（山东）空调有限公司 | A kind of wind induction apparatus and fresh air system |
| CN108494314B (en) * | 2018-04-20 | 2020-04-21 | 珠海格力电器股份有限公司 | Motor control method, motor control circuit and motor |
| CN110247593B (en) * | 2019-07-05 | 2021-01-19 | 珠海格力电器股份有限公司 | Method for detecting rotating speeds of multiple direct current fans |
| CN110454946B (en) * | 2019-08-13 | 2021-04-06 | 江苏群达智能科技有限公司 | Fan speed regulation method for universal variable frequency air conditioner control panel |
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Address after: 239000 No. 585, Shanghai Road, Chengdong Industrial Park, Chuzhou economic and Technological Development Zone, Anhui Patentee after: Anhui Yangzi Air Conditioning Co., Ltd Address before: 239000 No. 585, Shanghai Road, Chengdong Industrial Park, Chuzhou economic and Technological Development Zone, Anhui Patentee before: CHINA YANGZI GROUP CHUZHOU YANGZI AIR CONDITIONER Co.,Ltd. |