WO2018149031A1 - Circuit de protection de compresseur et climatiseur - Google Patents

Circuit de protection de compresseur et climatiseur Download PDF

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Publication number
WO2018149031A1
WO2018149031A1 PCT/CN2017/082510 CN2017082510W WO2018149031A1 WO 2018149031 A1 WO2018149031 A1 WO 2018149031A1 CN 2017082510 W CN2017082510 W CN 2017082510W WO 2018149031 A1 WO2018149031 A1 WO 2018149031A1
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WO
WIPO (PCT)
Prior art keywords
module
resistor
compressor
output
voltage
Prior art date
Application number
PCT/CN2017/082510
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English (en)
Chinese (zh)
Inventor
鲍殿生
Original Assignee
广东美的制冷设备有限公司
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Application filed by 广东美的制冷设备有限公司 filed Critical 广东美的制冷设备有限公司
Publication of WO2018149031A1 publication Critical patent/WO2018149031A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption

Definitions

  • the present invention relates to the field of compressor protection circuits, and more particularly to a compressor protection circuit and an air conditioner.
  • the driving scheme of the outdoor compressor of the inverter air conditioner is usually obtained by rectifying and filtering the AC power source to obtain the DC bus power supply, and the DC bus power source is subjected to the power factor correction processing by the power factor correction circuit, and then the power is supplied to the intelligent power module, and finally The intelligent power module directly drives the compressor to work.
  • the MCU in the inverter air conditioner outputs a driving signal to enable the intelligent power module to drive the compressor according to the corresponding phase current.
  • the prior art provides a compressor current protection circuit for inputting the phase current of the compressor to the first comparator by converting the magnitude of the current used into a sampled voltage signal. And comparing with the reference voltage value, when the compressor over-current causes the sampling voltage signal to rise, causing the first comparator output to flip to output a protection signal to control the output of the intelligent power module to be turned off, so that when the phase current of the compressor is too large The intelligent power module is turned off its phase current output to protect the compressor.
  • the following problems will be encountered: since the increase of the compressor current is a continuously changing time process, there is a fluctuation time when the voltage sampling signal approaches the reference voltage value, that is, the magnitude of the sampled voltage value is the same as the reference voltage. Or a critical value of the small difference, the sampled voltage value fluctuates around the reference voltage value for a period of time, so that the output state of the first comparator is unstable during this time period, thereby causing the protection state of the intelligent power module to be unstable; Or because there is an interference signal on the phase current of the compressor, the sampled voltage value is lower or higher than the reference voltage value in a short time, which also causes the protection state of the intelligent power module to be unstable, and the protection state of the intelligent power module is not Stabilization will cause the intelligent power module to drive the compressor uncontrollable, and there is a problem that the intelligent power module is damaged.
  • the main object of the present invention is to provide a compressor protection circuit and an air conditioner, which aims to solve the problem that the protection power state is unstable during the compressor overcurrent protection circuit, and the intelligent power module drives the compressor uncontrollable to cause damage of the intelligent power module.
  • the present invention provides a compressor protection circuit including a current sampling module, a voltage comparison module, a reference voltage module, a shaping module, an MCU, and an intelligent power module;
  • the driving signal output by the MCU outputs a phase current to drive the compressor to operate;
  • the reference voltage module generates a reference voltage output to the first input end of the voltage comparison module;
  • the current sampling module performs a phase current of the compressor Sampling and outputting a corresponding sampled voltage signal to a second input of the voltage comparison module;
  • the voltage comparison module comparing the sampled voltage signal with the reference voltage signal, and wherein the sampled voltage signal is greater than
  • the output protection signal is shaped to the smart power module by the shaping module;
  • the intelligent power module turns off the output phase current according to the protection signal to stop the compressor operation, and simultaneously outputs the fault protection signal to enable the Said MCU stops outputting said drive signal;
  • said compressor protects Circuit further comprises:
  • the input end is connected to the output end of the voltage comparison module, and the output end is connected to the first input end of the voltage comparison module; when the voltage comparison module is in the compressor phase current is excessively greater than the preset value output protection During the signal, the protection signal output by the voltage comparison module is fed back to the first input end of the voltage comparison module, so that the voltage value of the first input end of the voltage comparison module is lowered.
  • the voltage comparison module includes a first comparator
  • the first input end of the voltage comparison module is connected to the non-inverting input end of the first comparator, and the second input end of the voltage comparison module is connected to the reverse phase input end of the first comparator.
  • the feedback module includes a first resistor
  • One end of the first resistor is an input end of the feedback module, and the other end of the first resistor is an output end of the feedback module.
  • the feedback module includes a first diode
  • the cathode of the first diode is an input end of the feedback module, and the anode of the first diode is an output end of the feedback module.
  • the feedback module includes a second resistor and a second diode
  • a cathode of the second diode is an input end of the feedback module, an anode of the second diode is connected to one end of the second resistor, and another end of the second resistor is a feedback module Output.
  • the shaping module comprises a third resistor and a first NPN transistor
  • the base of the first NPN transistor is extremely at the input end of the shaping module, the emitter of the first NPN transistor is grounded, and the common electrode of the collector of the first NPN transistor and the third resistor For the output end of the shaping module, the other end of the third resistor is connected to a DC power source.
  • the shaping module comprises a fourth resistor, a second NPN transistor and a third NPN transistor;
  • the base of the second NPN transistor is substantially the input end of the shaping module, the emitter of the second NPN transistor is connected to the base of the third NPN transistor, and the collector of the second NPN transistor is The common junction of the collector of the third NPN transistor and the end of the fourth resistor is an output end of the shaping module, the other end of the fourth resistor is connected to a DC power source, and the emitter of the third NPN transistor is grounded.
  • the shaping module comprises a fifth resistor, a fourth NPN transistor and a fifth PNP transistor;
  • the base of the fourth NPN transistor is substantially the input end of the shaping module, the collector of the fourth NPN transistor is connected to the base of the fifth PNP transistor, and the emitter of the fifth PNP transistor is The common junction of one end of the fifth resistor is an output end of the shaping module, the other end of the fifth resistor is connected to a DC power source, and an emitter of the fourth NPN transistor is grounded.
  • the shaping module comprises a sixth resistor and a sixth PNP transistor;
  • the base of the sixth PNP type transistor is substantially the input end of the shaping module, the emitter of the sixth PNP type transistor is connected to a DC power source, the collector of the sixth PNP type transistor is at one end of the sixth resistor
  • the common junction is the output end of the shaping module, and the other end of the sixth resistor is connected to the ground.
  • the compressor protection circuit further includes a temperature protection module, an input end of the temperature protection module is connected to the smart power module, and an output end of the temperature protection module is connected to a second input end of the voltage comparison module;
  • the smart power module When the temperature of the smart power module is too high, the smart power module outputs a temperature protection signal to the second input end of the voltage comparison module through the temperature protection module, so that the voltage comparison module outputs a protection signal to the smart power module.
  • the smart power module turns off the output phase current according to the protection signal to stop the compressor operation.
  • the temperature protection module includes a sixth resistor, a seventh resistor, and a third diode;
  • One end of the sixth resistor is an input end of the temperature protection module, and the other end of the sixth resistor and one end of the seventh resistor are connected to an anode of the third diode, the third The cathode of the diode is the output of the temperature protection module, and the other end of the seventh resistor is grounded.
  • the voltage comparison module further includes an eighth resistor, one end of the eighth resistor is connected to the output end of the first comparator, and the other end is connected to a DC power source.
  • the shaping module further comprises a ninth resistor, one end of the ninth resistor is connected to the base of the first NPN transistor, and the other end is connected to the DC power source.
  • the present invention also provides an air conditioner including the compressor protection circuit.
  • the compressor protection circuit provided by the invention adds a feedback module by having a current sampling module, a reference voltage module, a voltage comparison module, a shaping module, an MCU and an intelligent power module, because the feedback module is connected to the reference voltage input end of the voltage comparison module and The output makes the voltage comparison module's protection and recovery reference voltage values different. It solves that the output state of the voltage comparison module is unstable due to the fluctuation of the input voltage of the voltage comparison module and the reference voltage value, which leads to the instability of the protection state of the intelligent power module, which causes the intelligent power module to drive the compressor uncontrollable, and finally leads to intelligence. The problem of power module damage.
  • FIG. 1 is a schematic structural view of a module of a first embodiment of a compressor protection circuit of the present invention
  • FIG. 2 is a circuit structural diagram of a second embodiment of a compressor protection circuit of the present invention.
  • FIG. 3 is a circuit structural diagram of a third embodiment of a compressor protection circuit of the present invention.
  • FIG. 4 is a circuit structural diagram of a fourth embodiment of a compressor protection circuit of the present invention.
  • Figure 5 is a circuit configuration diagram of a fifth embodiment of a compressor protection circuit of the present invention.
  • Figure 6 is a circuit diagram showing another circuit of the fifth embodiment of the compressor protection circuit of the present invention.
  • Figure 7 is a circuit diagram showing another circuit of the fifth embodiment of the compressor protection circuit of the present invention.
  • Figure 8 is a circuit structural view of a sixth embodiment of a compressor protection circuit of the present invention.
  • Figure 9 is a block diagram showing another circuit of the sixth embodiment of the compressor protection circuit of the present invention.
  • FIG. 10 is a schematic structural view of a module of a seventh embodiment of a compressor protection circuit of the present invention.
  • Figure 11 is a circuit structural view showing a seventh embodiment of the compressor protection circuit of the present invention.
  • Figure 12 is a block diagram showing another circuit of the seventh embodiment of the compressor protection circuit of the present invention.
  • FIG. 1 is a block diagram of a compressor protection circuit according to a first embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are described in detail as follows:
  • the compressor protection circuit provided by the embodiment of the present invention includes a current sampling module 10, a voltage comparison module 20, a reference voltage module 30, a shaping module 80, an MCU 50, and an intelligent power module 70.
  • the intelligent power module 70 outputs a phase according to a driving signal output by the MCU 50.
  • the current is driven to drive the compressor;
  • the reference voltage module 30 generates a reference voltage output to the first input of the voltage comparison module 20;
  • the current sampling module 10 samples the phase current of the compressor and outputs a corresponding sampled voltage signal to the voltage comparison module 20
  • the voltage comparison module 20 compares the sampling voltage signal with the reference voltage signal, and when the sampling voltage signal is greater than the reference voltage signal, outputs the protection signal to the intelligent power module 70 via the shaping module 80; the intelligent power module 70 according to the protection
  • the signal turns off the output phase current to stop the compressor operation, and simultaneously outputs a fault protection signal to stop the MCU 50 from outputting the driving signal;
  • the compressor protection circuit further includes:
  • the feedback module 40 has an input end connected to the output end of the voltage comparison module 20, and an output end connected to the first input end of the voltage comparison module 20; when the voltage comparison module 20 outputs a protection signal when the compressor phase current is excessively greater than a preset value The protection signal output by the voltage comparison module 20 is fed back to the first input end of the voltage comparison module 20, so that the voltage value of the first input terminal of the voltage comparison module 20 is lowered.
  • the compressor protection circuit provided by the embodiment of the present invention adds the feedback module 40 by having the current sampling module 10, the voltage comparison module 20, the reference voltage module 30, the shaping module 80, the MCU 50, and the intelligent power module 60, because the feedback module 30 is connected to the voltage. Comparing the first input end and the output end of the module 20, the first input end is connected to the output end of the reference voltage module 30, and is fed back to the first input of the voltage comparison module 20 through the feedback module 30 when the voltage comparison module 20 outputs the protection signal. End, the voltage value of the first input terminal of the voltage comparison module 20 is lowered, thereby changing the reference voltage value output by the reference voltage module 30 to the voltage comparison module 20, so that the protection and recovery reference voltage values of the voltage comparison module are different, and the solution is solved.
  • the output state of the voltage comparison module is unstable, which leads to the unstable protection state of the intelligent power module, which causes the intelligent power module to drive the compressor uncontrollable, and finally leads to intelligent power.
  • the problem of module damage is because the input terminal of the voltage comparison module has fluctuations close to the reference voltage value.
  • FIG. 2 is a structural diagram of a circuit of a compressor protection circuit according to a second embodiment of the present invention.
  • the module structure diagram of the compressor protection circuit according to the first embodiment of the present invention is only shown for convenience of description.
  • the relevant parts of the embodiments of the present invention are specifically as follows:
  • the current sampling module 10 is mainly composed of a resistor RS1.
  • One end of the resistor RS1 is connected to the intelligent power module 60 to drive the lower arm switching tubes U, V, and W of the compressor 70 to the three-phase emitter output pins Iu, Iv, and Iw.
  • the pin output current is the three-phase current of the IPM module driving the compressor 70.
  • the connection point is simultaneously connected to the input end of the voltage comparison module 20.
  • the other end of the resistor RS1 is connected to the same potential, and the resistance RS1 is generally small.
  • a power resistor such as a milliohm-grade ceramic resistor, is used by the IPM module to drive the three-phase current of the compressor 70 to generate a voltage across the resistor RS1 to generate a sampled voltage signal.
  • the first comparator 21 of the voltage comparison module 20 is the first comparator IC1, the first input terminal of the voltage comparison module 20 is connected to the non-inverting input terminal of the first comparator IC1, and the second input terminal of the voltage comparison module 20 is connected to the first comparison. Inverting input of IC1.
  • the shaping module 80 includes a third resistor R4 and a first NPN transistor Q1;
  • the base of the first NPN transistor Q1 is the input end of the shaping module 80, the emitter of the first NPN transistor Q1 is grounded, and the common junction of the collector of the first NPN transistor Q1 and the third resistor R4 is the shaping module 22 At the output end, the other end of the third resistor R4 is connected to a DC power source.
  • the shaping module 80 may further include a tenth resistor R11.
  • One end of the tenth resistor R11 is connected to the base of the first NPN transistor Q1, and the other end of the tenth resistor R11 is grounded, that is, the tenth resistor R11 is connected across the first NPN transistor.
  • the first NPN transistor Q1 can be reliably turned off when the first comparator IC1 outputs a low level.
  • the shaping module 80 may further include an eleventh resistor R10. One end of the eleventh resistor R10 is connected to the base of the first NPN transistor Q1, and the other end is an input end of the shaping module 80 to replace the first NPN transistor.
  • the base of Q1 serves as the input of the shaping module 80.
  • the reference voltage module 30 is connected to the same input end of the first comparator IC1, the reference voltage module 30 provides a reference voltage for the voltage comparison module 20, and the reference voltage module 30 is composed of a twelfth resistor R2 and a thirteenth resistor R6, wherein the tenth One end of the two resistors R2 is connected to the DC power supply, the other end is connected to the thirteenth resistor R6, and the other end of the thirteenth resistor R6 is grounded, and the reference voltage signal is output from the connection point of the twelfth resistor R2 and the thirteenth resistor R6 and is connected to The non-inverting input terminal of the first comparator IC1;
  • the feedback module 40 includes a first resistor R1. One end of the first resistor R1 is an input end of the feedback module 40, and the other end of the first resistor R1 is an output end of the feedback module 40.
  • the intelligent power module 60 is an existing intelligent power module 60 including a controller and upper and lower arm switch tubes (ie, IPM, Intelligent) Power Module), where Iu, Iv, Iw are the U, V, W three-phase emitter output pins of the lower arm switch tube, and Cin is the fault and protection signal detection pin. When this pin has a high level signal, it is faulty. And the protection signal is valid, the intelligent power module 60 internally turns off the U, V, W three-phase pin output to close the load, where the U, V, W three-phase output pins are connected to the compressor 70, where the compressor 70 It is an inverter compressor; the F0 pin is a fault signal output pin.
  • IPM Intelligent Power Module
  • the F0 pin When the fault of the Cin pin and the protection signal are valid, the F0 pin outputs a valid fault signal;
  • the UP, VP, WP, UN, VN, and WN are upper and lower arm switch tube drive signal input pins, and the six drive signals are input to the smart power module 60 to cause the smart power module 60 to drive the compressor 70 to operate.
  • the MCU 50 is a signal processing chip, and includes a software algorithm program for driving the intelligent power module 60 to operate, so that the load compressor 70 operates according to the driving signal output by the MCU 50, wherein the output control pin is connected to the Cin pin of the intelligent power module 60, and the IPM module is fault detected.
  • the pin is connected to the F0 pin of the smart power module 60.
  • the three-phase current of the compressor 70 is normal.
  • the U, V, W three-phase emitter output pins Iu, Iv, Iw current of the lower arm switch tube of the intelligent power module 60 The voltage on the RS is smaller than the reference voltage of the first comparator IC1 from the non-inverting input terminal.
  • the first comparator IC1 outputs a high level, and the first NPN transistor Q1 is turned on to output a low level to the Cin of the intelligent power module 60.
  • the smart power module works normally.
  • the reference voltage output by the reference voltage module 30 is the value of the ground voltage on the thirteenth resistor R6 after the twelfth resistor R2 is connected in series with the thirteenth resistor R6.
  • the comparator IC1 When the voltage on the resistor RS1 is greater than the reference voltage of the non-inverting input terminal of the first comparator IC1, the first time The comparator IC1 outputs a low level signal, that is, a compressor 70 phase current overshoot signal, and the low level signal is fed back to the non-inverting input terminal of the first comparator IC1 via the first resistor R1 of the feedback module 40, that is, the reference voltage module 30
  • the output terminal is connected to the first resistor IC1 and the first resistor R1 is connected to the first resistor R1.
  • the twelfth resistor R6 has a small resistance value, so the voltage value of the grounding voltage of the thirteenth resistor R6 and the first resistor R1 is lower than the voltage value of the single thirteenth resistor R6 when the original compressor is normally operated, that is, when it is compressed When the phase current of the machine increases, causing the first comparator IC1 to output a low level signal, the voltage value of the first input terminal of the voltage comparison module 20 is lowered.
  • the low level signal output by the first comparator IC1 causes the first NPN transistor Q1 to turn off the output high level to the Cin pin of the smart power module 60, and the intelligent power module 60 turns off the power according to the effective fault and protection signal.
  • Phase current output to control compressor 70 shutdown while at intelligent power module 60 The fault signal output pin F0 correspondingly outputs a level pulse fault signal to the MCU 50, and the MCU 50 stops outputting the 6 drive signals to the smart power module 60 according to the detected fault signal.
  • the increase in the voltage on the resistor RS1 is a continuous time course during which the voltage value is increased. It is not completely linearly increasing. It is a process in which the upper and lower fluctuations increase.
  • the voltage value is close to the reference voltage of the non-inverting input terminal of the first comparator IC1, if the reference voltage is constant, the fluctuation of the voltage value will be short.
  • the output state of the first comparator IC1 changes with the fluctuation of the input terminal, and the state of the output of the first comparator IC1 is unstable, resulting in the Cin pin of the smart power module 60 not being Stable, that is, the protection state of the intelligent power module 60 is unstable, so that the intelligent power module drives the compressor to be uncontrollable, and there may be an intelligent power module 60 that causes the phase current to be output to the compressor when the smart power module 60 or the compressor is faulty. Overcurrent damage.
  • the feedback module 40 of the present invention when the first comparator IC1 outputs a low level due to excessive phase current, the reference module of the first comparator IC1 is lowered by the feedback module 40, so that the first comparator IC1 is required.
  • the sampled voltage value on the resistor RS1 needs to be lower than the value of the reference voltage to be protected, that is, the voltage value of the protection and recovery of the first comparator IC1 is different, and the restored voltage is lower than the protected voltage value. Therefore, the above-mentioned frequent change of the output state of the first comparator IC1 due to the fluctuation of the sampled voltage value is avoided, and the protection state of the smart power module 60 is unstable, and the overcurrent damage is avoided.
  • a level pulse fault signal is output correspondingly, and a high level signal is output through the output control pin to the Cin pin of the smart power module 60, so that The intelligent power module 60 is in a continuous fault protection state, and the intelligent power module 60 continuously turns off its phase current output to control the compressor 70 to shut down.
  • This can further enable the intelligent power module 60 to not interfere with the output of the intelligent power module 60 by the MCU 50 during the fault protection, and the smart power module 60 falsely turns on the output current of the compressor due to interference on the compressor phase current, resulting in intelligent power. Module 60 is further damaged.
  • the phase current output by the smart power module 60 is lowered such that the sampled voltage value on the resistor RS1 is lowered below the voltage value recovered by the first comparator IC1, so that the first The comparator IC1 outputs a high level flip, so that the first NPN transistor Q1 is turned on and outputs a low level, and the MCU50 output control pin outputs a low level, so that the Cin pin of the smart power module 60 is at a low level, and the fault occurs.
  • the protection state is restored, and the MCU 50 outputs a drive signal to control the smart power module 60 to output a phase current to drive the compressor 70 to operate normally.
  • the first resistor R1 of the feedback module 40 reduces the reference voltage value decrease when the phase current outputted by the smart power module 60 is increased such that the first comparator IC1 is turned over to form a first comparator IC1 to protect and restore voltage inconsistency.
  • the phase current terminal outputted by the intelligent power module 60 may have strong interference, causing the voltage on the resistor RS1 to fluctuate, causing the first comparator IC1 to flip protection.
  • the reference voltage is unchanged, the state in which the output of the first comparator IC1 is unstable may cause the Cin pin of the smart power module 60 to be unstable, and finally cause the overcurrent damage of the smart power module 60, and the present invention is utilized.
  • the feedback module 40 is configured to prevent the first comparator IC1 from being inconsistent with the protection voltage, and the restored voltage is lower than the protection voltage value. By reasonably selecting the recovery voltage value, the first comparator IC1 can be turned over and protected when such interference occurs. And the protection can be restored when the interference is eliminated, thereby increasing the anti-interference ability of the compressor protection circuit. It makes the circuit more reliable.
  • the shaping module 80 may further include a fourth diode D1.
  • the anode of the fourth diode D1 is connected to the common contact of the collector of the first NPN transistor Q1 and the third resistor R4, and the fourth diode
  • the cathode of the tube D1 serves as an output of the shaping module 80 for its output isolation.
  • the MCU50 output control pin can also be connected to the Cin pin of the smart power module 60 through the fifth diode D2, which also serves as an output isolation.
  • the compressor protection circuit provided by the embodiment of the present invention adds the feedback module 40 by having the current sampling module 10, the voltage comparison module 20, the reference voltage module 30, the shaping module 80, the MCU 50, and the intelligent power module 60, because the feedback module 30 is connected to the voltage. Comparing the first input end and the output end of the module 20, the first input end is connected to the output end of the reference voltage module 30, and is fed back to the first input of the voltage comparison module 20 through the feedback module 30 when the voltage comparison module 20 outputs the protection signal. End, the voltage value of the first input terminal of the voltage comparison module 20 is lowered, thus changing the reference voltage value output by the reference voltage module 30 to the voltage comparison module 20, so that the voltage value of the voltage comparison module 20 is different from the protection and recovery, and is restored.
  • the voltage is lower than the voltage value of the protection, thus avoiding the interference of the sampling signal output by the current sampling module 10 or the fluctuation of the output voltage of the voltage comparison module 20 caused by the fluctuation of the reference voltage value, thereby causing the protection of the intelligent power module 60.
  • Unstable state causes intelligent power module to drive compressor uncontrollable final guide The problem of damage to the intelligent power module improves the operational reliability of the entire compressor protection circuit.
  • FIG. 3 is a circuit configuration diagram of a third embodiment of a compressor protection circuit according to the present invention.
  • the first embodiment of the compressor protection circuit according to the present invention is different from the compressor protection circuit of FIG. 2 in that the feedback module is different from the feedback module. 40, other modules are the same as shown in FIG. 2, and therefore will not be described again.
  • the feedback module 40 includes a first diode D3; the cathode of the first diode D3 is an input end of the feedback module, and the anode of the first diode D3 is an output end of the feedback module.
  • the circuit structure of the feedback module 30 of FIG. 3 is different in that the first diode D3 is replaced with the first resistor R1.
  • the resistor The voltage on the RS is smaller than the reference voltage of the first comparator IC1 from the non-inverting input terminal.
  • the first comparator IC1 outputs a high level, at which time the first diode D1 is turned off; when the phase current output by the smart power module 60 is increased.
  • the voltage on the resistor RS1 increases correspondingly, the first comparator IC1 is turned over to output a low level.
  • the first diode D3 is turned off, and the first comparator IC1 is pulled from the reference voltage of the non-inverting input terminal.
  • the first diode D3 is a silicon tube
  • its turn-on voltage is 0.7V.
  • the first comparator IC1 is pulled down from the reference voltage of the non-inverting input terminal to 0.7V, and the voltage is turned over by the first comparator IC1.
  • the former reference voltage value is low, and therefore the first comparator IC1 protects and restores the voltage inconsistency due to the conduction of the first diode D3, and other functions are not described again in the second embodiment.
  • FIG. 4 is a circuit configuration diagram of a compressor protection circuit according to a fourth embodiment of the present invention.
  • the first embodiment of the compressor protection circuit according to the present invention is different from the compressor protection circuit of FIG. 2 in that the feedback module is different from the feedback module. 40, other modules are the same as shown in FIG. 2, and therefore will not be described again.
  • the feedback module 40 includes a second resistor R3 and a second diode D4; a cathode of the second diode D4 is an input end of the feedback module 40, an anode of the second diode D4 is connected to one end of the second resistor R3, and a second The other end of the resistor R3 is the output of the feedback module 40.
  • the resistor The voltage on the RS is smaller than the reference voltage of the first comparator IC1 from the non-inverting input terminal.
  • the first comparator IC1 outputs a high level, and the second diode D4 is turned off; when the phase current output by the smart power module 60 is increased.
  • the voltage on the resistor RS1 increases correspondingly, the first comparator IC1 is turned over to output a low level.
  • the second diode D4 is turned off, and the first comparator IC1 is pulled from the reference voltage of the non-inverting input terminal.
  • the second diode D4 is a silicon tube
  • its turn-on voltage is 0.7V
  • the second resistor R3 the second resistor R3
  • the first comparator IC1 is pulled down from the non-inverting input terminal to a voltage slightly higher than 0.7V. a voltage value that is lower than a reference voltage value before the first comparator IC1 is turned over, so that the first comparator IC1 protects and restores the voltage from being inconsistent due to the conduction of the second diode D4, and the other functions are the same as the second implementation.
  • the examples will not be described again.
  • FIG. 5 is a circuit configuration diagram of a fifth embodiment of a compressor protection circuit according to the present invention.
  • the first embodiment of the compressor protection circuit according to the present invention is different from the compressor protection circuit of FIG. 80, other modules are the same as shown in FIG. 2, and therefore will not be described again.
  • the shaping module 80 includes a fourth resistor R3, a second NPN transistor Q2, and a third two NPN transistor Q3;
  • the base of the second NPN transistor is the input end of the shaping module 80, the emitter of the second NPN transistor Q2 is connected to the base of the third two NPN transistor Q3, the collector of the second NPN transistor Q2 and the third NPN transistor
  • the collector of Q3 and the common junction of one end of the fourth resistor are the output ends of the shaping module, the other end of the fourth resistor is connected to the DC power source, and the emitter of the third NPN transistor Q3 is grounded.
  • the present embodiment uses a composite tube composed of a second NPN transistor Q2 and a third two NPN transistor Q3 instead of the first NPN transistor Q1 of FIG. 2, and the working principle is the same, and will not be described again.
  • the shaping module 80 may further include a fourteenth resistor R7, a fifteenth resistor R16, and a sixth diode D5, and functions as the tenth resistor R11, the eleventh resistor R10, and the fourth diode D1 in FIG.
  • the shaping module 80 can also have other circuit structures, as shown in FIG. 6, its shaping module 80 includes a fifth resistor R12, a fourth NPN transistor Q4 and a fifth PNP transistor Q5;
  • the base of the fourth NPN transistor Q4 is at the input end of the shaping module 80, the collector of the fourth NPN transistor Q4 is connected to the base of the fifth PNP transistor Q5, and the emitter of the fifth PNP transistor Q5 is connected to the end of the fifth resistor.
  • the common contact is the output end of the shaping module 80, the other end of the fifth resistor is connected to the DC power source, and the emitter of the third NPN transistor Q4 is grounded.
  • the present embodiment uses a composite tube composed of a fourth NPN transistor Q4 and a fifth PNP transistor Q5 instead of the first NPN transistor Q1 of FIG. 2, and the working principle is the same, and will not be described again.
  • the module 80 may further include a fifteenth resistor R8, a sixteenth resistor R17 and a seventh diode D6, and functions as the tenth resistor R11, the eleventh resistor R10 and the fourth diode D1 in FIG.
  • FIG. 1 Another circuit structure of the shaping module 80 is shown in FIG. 1
  • the shaping module 80 includes a sixth resistor R10 and a sixth PNP transistor Q6;
  • the base of the sixth PNP type transistor Q6 is the input end of the shaping module 80, the emitter of the sixth PNP type transistor Q6 is connected to the DC power source, and the common point of the collector of the sixth PNP type transistor Q6 and the sixth resistor is the shaping module 80. At the output end, the other end of the sixth resistor is connected to the ground.
  • the first comparator IC1 When the smart power module 60 and the compressor 70 are working normally, the first comparator IC1 outputs a high level such that the sixth PNP-type transistor Q6 is turned off to output a low level to the Cin pin of the smart power module 60; when the smart power module 60 outputs When the phase current increases, the first comparator IC1 inverts and outputs a low level, so that the sixth PNP type transistor Q6 is turned on to output a high level to the Cin pin of the smart power module 60.
  • the shaping module 80 may further include a seventeenth resistor R20 and an eighth diode D7 having the same function as the eleventh resistor R10 and the fourth diode D1 of FIG.
  • FIG. 8 is a circuit structural diagram of a sixth embodiment of a compressor protection circuit according to the present invention.
  • the first embodiment of the compressor protection circuit according to the present invention is different from the compressor protection circuit of FIG. 2 in voltage comparison.
  • the module 20 further includes an eighth resistor R18. One end of the eighth resistor is connected to the output of the voltage comparison module 20, and the other end is connected to the DC power source VCC.
  • the second comparator IC2 in FIG. 8 may be different from the first comparator IC1 model in FIG. 2.
  • the second comparator IC2 may use an internal output transistor open collector output type comparator, which cannot directly output a high level by itself. It needs to be pulled up to the VCC output high level through the eighth resistor R18; and the output of the first comparator IC1 has no pull-up resistor similar to the eighth resistor R18, and the first comparator IC1 must adopt the internal output transistor push-pull Output type, which must be able to output a high level by itself.
  • the second comparator IC2 can also adopt an internal output transistor push-pull output type comparator, so that the comparator can be adapted to a wider range of comparator types by the pull-up eighth resistor R18.
  • the shaping module 80 further includes a ninth resistor R19.
  • One end of the ninth resistor R19 is connected to the base of the first NPN transistor, and the other end is connected to a DC power source.
  • the ninth resistor R19 can also perform a pull-up function on the output end of the voltage comparison module 20.
  • the adaptation type of the third comparator IC3 of the voltage comparison module 20 is made wider.
  • the compressor protection circuit further includes a temperature protection module 90 and a temperature protection module.
  • the input end of 90 is connected to the intelligent power module 60, and the output end of the temperature protection module 90 is connected to the second input end of the voltage comparison module 20;
  • the smart power module 60 When the temperature of the smart power module 60 is too high, the smart power module 60 outputs a temperature protection signal to the second input end of the voltage comparison module 20 through the temperature protection module 90, so that the voltage comparison module 20 outputs the protection signal to the smart power module 60, and the smart The power mode 60 blocks the output phase current according to the protection signal to stop the compressor 70 from operating.
  • FIG. 11 is a circuit configuration diagram of the temperature protection module 90 of the present invention, the temperature protection module 90 includes a sixth resistor R14, a seventh resistor R15, and a third diode D8;
  • One end of the sixth resistor R14 is an input end of the temperature protection module 90, the other end of the sixth resistor R14 is connected to one end of the seventh resistor R15 to the anode of the third diode D8, and the cathode of the third diode D8 is At the output of the temperature protection module 90, the other end of the seventh resistor R15 is grounded.
  • the intelligent power module 60 used in the embodiment of the present invention is an intelligent power module with a temperature signal output function, which detects the internal temperature of the intelligent power module 60, and outputs a signal reflecting the temperature through the TO pin of the intelligent power module 60 in FIG. If the different internal voltages of the smart power module 60 are reflected by different voltage values, when the operating current of the compressor is too high, the phase current output by the smart power module 60 is too large, and the temperature rise of the body of the smart power module 60 increases rapidly. At this time, if the effective protection is not obtained, the module is easily damaged.
  • the voltage signal of the TO power output of the intelligent power module 60 reflects the temperature and generates a voltage value of a suitable voltage range through the voltage dividing circuit constituting the sixth resistor R14 and the seventh resistor R15, and outputs the voltage value to the voltage comparison module 20 through the third diode D8.
  • the interference signal is generated on the Iw to the inverting input terminal of the first comparator IC1, and finally causes the TO pin of the intelligent power module 60 to be damaged; when the temperature of the smart power module 60 is too high, the output voltage signal of the TO pin is raised, and finally
  • the first comparator IC1 outputs a low-level signal, that is, the compressor 70 phase current excessive signal, and other working principles and figures The same is shown in 2, so it will not be described again.
  • the change of the voltage signal value of the TO pin output reflecting the temperature also has a process, and is also a process of increasing the fluctuation, in which the voltage signal value is close to the non-inverting input of IC1.
  • the terminal reference voltage value is similar to the compressor phase current over-protection process in the second embodiment, if the reference voltage is constant, the state of the output of the first comparator IC1 is also unstable, and the feedback module of the present invention is added.
  • the first comparator IC1 inverts the output protection signal
  • the feedback voltage of the non-inverting input terminal of the IC1 is lowered by the feedback module, so that only the temperature of the body of the next smart power module 60 is lowered, so that the TO pin outputs a voltage signal value reflecting the temperature.
  • the first comparator IC1 can flip the recovery protection signal. Therefore, the addition of the feedback module 40 also overcomes the temperature rise of the smart power module 60, causing the state of the output of the first comparator IC1 to be unstable. Finally, the protection state of the smart power module 60 is unstable, causing damage thereto, so that the smart power module 60 is more protected. reliable.
  • FIG. 12 is a structural diagram of an application circuit related to the complete compressor control of the compressor protection circuit of the present invention based on FIG. 11, and its working principle is as follows:
  • Diode D9-D12 constitutes the rectifier circuit of the AC input terminal, rectifies the AC input voltage and converts it into DC ripple voltage.
  • L, D13 and C2 form a passive PFC circuit, and correct the DC ripple voltage output by the rectifier circuit.
  • C3 is The large-capacity high-voltage filter capacitor smoothly filters the DC ripple voltage into a stable DC voltage, and provides the DC power supply for the intelligent power module IC3.
  • the intelligent power module IC3 outputs U, V, W three-phase current-driven inverter compressors. M work.
  • the intelligent power module IC3 includes an upper bridge IGBT composed of S1, S3, and S5 (Insulated Gate Bipolar) Transistor) switch tube and S2, S4, S6 lower arm IGBT switch tube and controller; the controller is HVIC (High Voltage Integrated Circuit) high voltage integrated circuit and LVIC (Low Voltage Integrated) Circuit) is a low-voltage integrated circuit, HVIC is used to drive the upper bridge IGBT switch tube, LVIC is used to drive the lower bridge IGBT switch tube and includes related control and status signal pins, including fault signal output pin F0, fault and protection signal The detection pin Cin, the intelligent power module internal temperature detection signal output pin TO, and the U, V, W three-phase emitter output pins Iu, Iv, Iw of the lower arm switch tube.
  • HVIC High Voltage Integrated Circuit
  • LVIC Low Voltage Integrated Circuit
  • MCU IC4 is a signal processing chip, which contains the software algorithm program for driving the intelligent power module IC3 and its state detection, the status detection related program of the inverter compressor M, etc.; the P3-P7 six pins of the MCU are respectively connected to the intelligent power module IC5.
  • the Wn, Vn, Un, Wp, Vp, and Up input pins are connected to the LVIC and HVIC to drive the IGBT switch of the upper and lower arms through the LVIC and HVIC.
  • the other part of the circuit and the circuit including the current sampling module, the voltage comparison module, the shaping module, the reference voltage module, and the feedback module shown in FIG. 11 have the same working principle as that of FIG. 11 and will not be further described herein.
  • the present invention also provides an air conditioner, including the above-mentioned compressor protection circuit, and the air conditioner thereof is an inverter air conditioner.
  • an air conditioner including the above-mentioned compressor protection circuit, and the air conditioner thereof is an inverter air conditioner.

Landscapes

  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

L'invention concerne un circuit de protection de compresseur et un climatiseur. Le circuit de protection de compresseur est pourvu d'un module d'échantillonnage de courant (10), d'un module de tension de référence (30), d'un module de comparaison de tension (20), d'un module de mise en forme (80), d'une MCU (50), d'un module de puissance intelligent (60), et de plus, d'un module de rétroaction (40). Comme le module de rétroaction (40) est connecté à une extrémité d'entrée de tension de référence et à une extrémité de sortie du module de comparaison de tension (20), les valeurs de tension de référence de protection et de récupération du module de comparaison de tension (20) sont différentes. La présente invention résout le problème de détérioration du module de puissance intelligent (60) provoquée par la plongée non contrôlable d'un compresseur par le module de puissance intelligent (60) en raison d'un état de protection instable du module de puissance intelligent (60) parce que l'état de sortie du module de comparaison de tension (20) est instable en raison d'une fluctuation proche d'une valeur de tension de référence à l'extrémité d'entrée du module de comparaison de tension (20).
PCT/CN2017/082510 2017-02-20 2017-04-28 Circuit de protection de compresseur et climatiseur WO2018149031A1 (fr)

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CN107577269A (zh) * 2017-10-11 2018-01-12 荣成市华诚橡胶有限公司 一种橡胶传送带的功率调节系统
CN107526035A (zh) * 2017-10-11 2017-12-29 荣成市华诚橡胶有限公司 一种橡胶传送带的过负荷预警装置
CN109888721A (zh) * 2019-04-10 2019-06-14 珠海格力电器股份有限公司 压缩机驱动保护电路、压缩机系统及空调机组
CN110176451A (zh) * 2019-05-13 2019-08-27 珠海格力电器股份有限公司 功率模块及其封装方法
CN110350485B (zh) * 2019-07-12 2021-07-30 四川虹美智能科技有限公司 一种电流保护模块、系统及方法
CN110412341B (zh) * 2019-08-09 2020-09-01 珠海格力电器股份有限公司 Ipm过流检测电路
CN111707918B (zh) * 2020-06-22 2023-09-08 卧龙电气驱动集团股份有限公司 一种空调风机用电机控制系统自集成驱动检测方法及装置

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