Driving control circuit for vehicle-mounted refrigerator compressor

Abstract

The utility model provides a drive control circuit for a vehicle-mounted refrigerator compressor, which is characterized in that the drive control circuit comprises a power supply input circuit, an auxiliary power supply circuit and a single-chip microcomputer master control circuit, the single-chip microcomputer master control circuit is electrically connected with a motor drive circuit, the motor drive circuit is electrically connected with a motor current detection circuit, and the motor current detection circuit is electrically connected with the auxiliary power supply circuit. A voltage limiting protection circuit used for protecting the motor driving circuit is arranged between the power input circuit and the single-chip microcomputer main control circuit, the single-chip microcomputer main control circuit is further electrically connected with a fan speed regulation circuit, and the fan speed regulation circuit is electrically connected with a fan current detection circuit. According to the utility model, the input of the vehicle-mounted power supply can be stabilized, the anti-EMS effect is good, the electromagnetic interference generated by the circuit can be reduced, and the electronic components of the circuit board can be prevented from being damaged when the cooling fan is short-circuited.

Description

Technical field

[0001] The utility model relates to the field of drive control of vehicle-mounted refrigerators, in particular to a drive control circuit for a compressor of a vehicle-mounted refrigerator. [Background Technology]

[0002] Because car refrigerators are powered by both the engine and a battery, the power supply is easily affected by the engine, resulting in unstable voltage and current. Furthermore, the refrigerator's drive circuit is susceptible to electromagnetic interference from the vehicle's electronic control system, generating spikes that can damage the refrigerator's driver circuit board. Furthermore, to avoid affecting the vehicle's electronic control system, the refrigerator's drive circuit itself must not generate significant electromagnetic interference to comply with EMS standards. Furthermore, in existing car refrigerator designs, the compressor's cooling fan is exposed to the outside world, making it susceptible to water ingress and damage. In existing drive circuit structures, a short circuit in the cooling fan can damage the entire driver circuit board, making replacement and repair complex. [Utility Model Content]

[0003] In order to solve the defects of the existing vehicle refrigerator drive control circuit, maintain the stability of the vehicle input power supply, enhance the anti-EMS effect, and avoid damage to the cooling fan affecting the entire drive circuit board, the utility model provides a drive control circuit for the vehicle refrigerator compressor.

[0004] The utility model is realized through the following technical solutions:

[0005] A drive control circuit for a vehicle refrigerator compressor is characterized in that it includes a power input circuit, an auxiliary power circuit and a single-chip microcomputer main control circuit, the single-chip microcomputer main control circuit is electrically connected to a motor drive circuit for efficiently driving the compressor motor and reducing heat, the motor drive circuit is electrically connected to a motor current detection circuit for detecting the compressor motor current and feeding back a signal to the single-chip microcomputer main control circuit to detect abnormal conditions, a voltage limiting protection circuit for protecting the motor drive circuit is provided between the power input circuit and the single-chip microcomputer main control circuit, the single-chip microcomputer main control circuit is also electrically connected to a fan speed control circuit for driving and adjusting a cooling fan, the fan speed control circuit is electrically connected to a fan current detection circuit for detecting the cooling fan current and feeding back a signal to the single-chip microcomputer main control circuit to prevent damage to the external cooling fan and affecting the entire circuit board.

[0006] The driving control circuit for the vehicle refrigerator compressor as described above is characterized in that: the power input circuit includes an RC filter circuit and an anti-reverse connection circuit, the RC filter circuit includes a negative input port X1 for connecting to the vehicle power supply, a positive input port X2 and a ground port X3, a fuse F1 is connected in series on the positive input port X2, a capacitor C34 and a resistor R15 are connected in series, a capacitor C4 and a resistor R11 are connected in series and are connected in parallel with a bidirectional breakdown diode D2 and a common-mode inductor L2 between the negative input port X1 and the positive input port X2, a capacitor C5 and a resistor R15 are connected in series, and a bidirectional breakdown diode D2 and a common-mode inductor L2 are connected in parallel between the negative input port X1 and the positive input port X2. 2 are connected in series and then in parallel at the output end of the common-mode inductor L2; the reverse connection prevention circuit includes a MOS transistor Q1, the drain D of the MOS transistor Q1 is electrically connected to the negative input port X1, a voltage regulator diode DW1 and a resistor R13 are connected in parallel between the gate G and the source S of the MOS transistor Q1, the gate G of the MOS transistor Q1 is connected in series with a resistor R8 and then electrically connected to the positive input port X2, a polarity capacitor CE5 and a polarity capacitor CE7 are connected in parallel between the negative input port X1 and the positive input port X2, the negative electrode of the polarity capacitor CE5 is grounded, and the positive electrode is the output terminal Vin of the power input circuit.

[0007] The driving control circuit for the vehicle refrigerator compressor as described above is characterized in that: the auxiliary power supply circuit includes a constant voltage chip U1, pin 1 of the constant voltage chip U1 is connected in series with a magnetic bead RL1 and electrically connected to the output terminal Vin of the power input circuit, the positive electrode of the polarity capacitor CE3 is electrically connected to the output terminal Vin of the power input circuit and the negative electrode is grounded, the capacitor C33 is connected in parallel with the polarity capacitor CE3, pins 4, 5, 6, 7 and 8 of the constant voltage chip U1 are grounded, and pin 2 of the constant voltage chip U1 is The output end is connected in series with the inductor L1 and then electrically connected to pin 2 of the output port XS2. Pin 1 of the output port XS2 is grounded. The capacitor C1 and the resistor R3 are connected in series and then connected in parallel between pin 2 of the constant voltage chip U1 and the ground end. The positive pole of the voltage regulator diode D1 is grounded and the negative pole is electrically connected to pin 2 of the constant voltage chip U1. The resistors R1 and R2 are connected in series and then connected in parallel with the polarity capacitor CE4 and the capacitor C2 between pins 1 and pin 2 of the output port XS2. Pin 3 of the constant voltage chip U1 is electrically connected between the resistors R1 and R2.

[0008] The drive control circuit for a vehicle refrigerator compressor as described above is characterized in that: the power input circuit is electrically connected to an input voltage detection circuit for detecting the vehicle power voltage, the input voltage detection circuit includes a sampling resistor R32, one end of a capacitor C17 and a resistor R36 are connected in parallel across the sampling resistor R32 and the other end is grounded, one end of the sampling resistor R32 is connected in series with a resistor R27 and then electrically connected to the output terminal Vin of the power input circuit, the other end of the sampling resistor R32 is a signal output terminal Vin-ad and is electrically connected to the main control circuit of the single-chip microcomputer, and the positive electrode of the diode D13 is electrically connected to the signal output terminal Vin-ad, and the negative electrode is electrically connected to the output terminal of the auxiliary power circuit.

[0009] The driving control circuit for the vehicle refrigerator compressor as described above is characterized in that: the single-chip microcomputer main control circuit includes a single-chip microcomputer chip U2 and a burning interface J2, and the pin 1 of the single-chip microcomputer chip U2 is electrically connected to the output end of the auxiliary power supply circuit after being connected in series with a resistor R61 and a light-emitting diode LED1, and the pins of the single-chip microcomputer chip U2 are electrically connected to the motor drive circuit, the motor current detection circuit, the fan speed regulation circuit, and the fan current detection circuit respectively; the voltage limiting protection circuit includes a voltage dividing resistor R6, a transistor Q15 and a voltage stabilizing diode DW2, the collector C of the transistor Q15 is electrically connected to the output end of the power input circuit, the voltage dividing resistor R6 is connected in parallel between the base B and the emitter E of the transistor Q15, the base B of the transistor Q15 is connected in series with a capacitor C3 and then grounded, and the voltage stabilizing diode DW2 is connected in parallel with the base B of the transistor Q15. The diode DW2 is connected in parallel with the capacitor C3, the emitter E of the transistor Q15 is electrically connected to the pin 27 of the microcontroller chip U2 and to the positive electrode of the polarity capacitor CE1, the negative electrode of the polarity capacitor CE1 is grounded, the capacitor C28 is connected in parallel with the polarity capacitor CE1, the Schottky diodes D9, D11, and D12 are connected in parallel with the positive electrode electrically connected to the emitter E of the transistor Q15, and the negative electrode is connected in series with the resistors R45, R46, and R47 respectively, and then electrically connected to the pin 30, pin 26, and pin 23 of the microcontroller chip U2, one end of the bootstrap capacitors C23, C24, and C25 are connected in parallel with the resistors R45, R46, and R47 respectively, and the other end of the bootstrap capacitors C23, C24, and C25 and the pins 28, pin 24, and pin 21 of the microcontroller chip U2 are electrically connected to the U, V, and W pins of the motor terminal respectively.

[0010] The drive control circuit for a vehicle refrigerator compressor as described above is characterized in that: the motor drive circuit includes MOS transistors Q3 and MOS transistors Q9 corresponding to the U pin of the motor terminal, MOS transistors Q5 and MOS transistors Q11 corresponding to the V pin, and MOS transistors Q7 and MOS transistors Q13 corresponding to the W pin, the source electrodes S of the MOS transistors Q3, MOS transistors Q5, and MOS transistors Q7 are electrically connected to the output end of the power input circuit, the drain electrodes D of the MOS transistors Q9, MOS transistors Q11, and MOS transistors Q13 are connected in series with a capacitor C35, are electrically connected to the output end of the power input circuit, and are electrically connected to the motor current detection circuit, the drain electrode D of the MOS transistor Q3 is electrically connected to the source electrode S of the MOS transistor Q9 and is electrically connected to the U pin of the motor terminal, the gate electrode G of the MOS transistor Q3 is electrically connected to the cathode of the diode D3, the anode electrode of the diode D3 is connected in series with a resistor R17, and is electrically connected to the main control circuit of the single-chip microcomputer, and the capacitor C12 and the resistor R23 are connected in parallel to the MOS transistors Q3 and Q5. A filter structure and a discharge circuit for reducing EMS interference are formed between the gate G and drain D of Q3. The base B of the transistor Q2 is electrically connected to the positive electrode of the diode D3. The collector C is connected in series with a resistor R62 and then electrically connected to one end of the capacitor C12. The emitter E is electrically connected to the other end of the capacitor C12. The circuit structure of the MOS transistor Q9 is identical to that of the MOS transistor Q3. The circuit structure corresponding to the motor connection terminals V and W in the motor drive circuit is identical to the circuit structure of the U pin. The motor current detection circuit includes shunt resistors RE1 and RE2. The shunt resistors RE1 and RE2 are connected in parallel with the capacitor C21. The two ends of the shunt resistor RE1 are connected in series with resistors R40 and R42, respectively, and then electrically connected to the main control circuit of the single-chip microcomputer. One end of the shunt resistor RE2 is grounded, and the other end is electrically connected to one end of the resistor R41 and the motor drive circuit. The other end of the resistor R41 is connected in series with the capacitor C22 and then grounded, and is electrically connected to the motor and the motor drive circuit.

[0011] The driving control circuit for the vehicle refrigerator compressor as described above is characterized in that: the fan speed control circuit includes a MOS tube Q14 and a fan terminal XS4, the pin 1 of the fan terminal XS4 is connected in series with a magnetic bead RL2 and then electrically connected to the output end of the power input circuit and the positive electrode of the polarity capacitor CE2, the negative electrode of the polarity capacitor CE2 is grounded, the resistor R44 and the capacitor C26 are connected in series and then in parallel between the pins 1 and pin 2 of the fan terminal XS4, the negative electrode of the Schottky diode D10 and the positive electrode of the polarity capacitor CE6 are connected to the fan terminal XS 4 is electrically connected to pin 1, the positive electrode of the polarity capacitor CE6 is electrically connected to pin 2 of the fan terminal XS4, the positive electrode of the Schottky diode D10 and the pin 2 of the fan terminal XS4 are connected in series with the inductor L3 and then electrically connected to the source S of the MOS tube Q14, the gate G of the MOS tube Q14 is connected in series with the resistor R50 and then electrically connected to the main control circuit of the single-chip microcomputer, and is connected in series with the resistor R51 and then grounded, the drain D of the MOS tube Q14 is connected in series with the resistor R52 and then grounded and the drain D is electrically connected to the fan current detection circuit, and the two ends of the inductor L3 are respectively connected to the resistors R48 and R51. One end of the sampling resistor R49 is electrically connected, the other end of the resistor R48 is connected in series with the capacitor C30 and then grounded, the other end of the sampling resistor R49 is connected in series with the resistor R53 and then grounded, and is connected in series with the resistor R54 and then electrically connected to one end of the capacitor C31 and the main control circuit of the single-chip microcomputer, and the other end of the capacitor C31 is grounded; the fan current detection circuit includes an operational amplifier U3, the pin 8 of the operational amplifier U3 is electrically connected to the output end of the auxiliary power supply circuit and is connected in series with the resistor R55 and then electrically connected to the pin 3, the pin 1 of the operational amplifier U3 is connected to the resistor R57 and the resistor R58 One end of the fan speed control circuit is electrically connected to the output end of the auxiliary power supply circuit, the other end of the resistor R57 is electrically connected to the output end of the auxiliary power supply circuit, the other end of the resistor R58 is electrically connected to one end of the capacitor C29 and the main control circuit of the single-chip microcomputer, the other end of the capacitor C29 and the pin 4 of the operational amplifier U3 are grounded, the pin 2 of the operational amplifier U3 is electrically connected to the resistor R56 and one end of the capacitor C32, the other end of the resistor R56 is electrically connected to the drain D of the MOS tube Q14 in the fan speed control circuit, the other end of the capacitor C32 is grounded, and the pin 3 of the operational amplifier U3 is connected in series with the resistor R59 and then grounded.

[0012] The drive control circuit for a vehicle refrigerator compressor as described above is characterized in that: the single-chip microcomputer main control circuit is electrically connected to a refrigerator temperature detection circuit, and the refrigerator temperature detection circuit includes a terminal XS3 for connecting a temperature sensor, and pin 1 of the terminal XS3 is connected in series with a resistor R4 and then electrically connected to the output end of the auxiliary power supply circuit, one end of the resistor R5 is electrically connected to pin 1 of the terminal XS3, and the other end is electrically connected to the single-chip microcomputer main control circuit and one end of the capacitor C6, and the other end of the capacitor C6 and the pin 2 of the terminal XS3 are grounded.

[0013] The driving control circuit for the vehicle refrigerator compressor as described above is characterized in that: the single-chip microcomputer main control circuit is also electrically connected to a motor temperature detection circuit, and the motor temperature detection circuit includes a thermistor NTC1, one end of the thermistor NTC1 is connected in series with a resistor R26 and a resistor R31, and then electrically connected to the output end of the auxiliary power supply circuit and the single-chip microcomputer main control circuit, the other end of the thermistor NTC1 is grounded, and one end of the capacitor C16 is electrically connected to the resistor R31 and the other end is grounded.

[0014] The driving control circuit for the vehicle refrigerator compressor as described above is characterized in that: the driving control circuit is also provided with an external connection port for connecting to the vehicle refrigerator operation panel, the external connection port includes a wiring terminal XS1, pins 1 and 2 of the wiring terminal XS1 are respectively connected in series with resistors R10 and R9 and then electrically connected to the single-chip microcomputer main control circuit, pin 3 of the wiring terminal XS1 is grounded, pin 4 is electrically connected to the output end of the auxiliary power supply circuit, and pin 5 is electrically connected to the output end of the power input circuit.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. The utility model is used for the drive control circuit of the vehicle refrigerator compressor. The power input circuit adopts the RC filter circuit to filter the vehicle power supply. The existing filter circuits mostly adopt single-capacitor filter circuit and multi-capacitor series filter circuit. When the power generated by the engine fluctuates or the high voltage spike generated by the input power breaks down the capacitor, the single-capacitor filter circuit will cause a short circuit to damage the vehicle power system and battery. The multi-capacitor series filter circuit will cause the capacitance value to decrease after the capacitors are connected in series, affecting the filtering effect. The RC filter circuit has a resistor as a load, which can avoid short circuit and has a better filtering effect. Therefore, compared with the single-capacitor filter circuit and the multi-capacitor series filter circuit, it has better stability and safety. In addition, the RC filter circuit adopts a common-mode inductor, which can effectively filter out the power peak at the input end, maintain stable output of voltage and current, and reduce the influence of external EMS. At the same time, the RC filter circuit combined with the anti-reverse connection circuit can effectively protect the circuit board of the entire drive control circuit and prevent the reverse connection of the power supply from burning electronic components.

[0017] 2. The utility model is used for the drive control circuit of the vehicle refrigerator compressor. In the motor drive circuit, each MOS tube is provided with a filter capacitor and a discharge circuit connected in parallel with the filter capacitor, which can enhance the anti-EMS effect of the drive control circuit and reduce the electromagnetic interference generated by the motor drive circuit itself. In addition, each MOS tube is also provided with a triode discharge circuit connected to the filter capacitor for accelerating the shutdown speed of the MOS tube, which can effectively improve the operating speed of the motor and reduce the heat generation of the motor.

[0018] 3. The drive control circuit of the vehicle refrigerator compressor is provided with a fan current detection circuit. When the cooling fan is damaged and short-circuited, the fan current detection circuit detects that the circuit current exceeds the threshold value, and the single-chip microcomputer main control circuit controls the MOS tube Q14 to disconnect the loop, and the current passes through the voltage-dividing resistors R49 and R53 and is grounded, which will not affect other parts of the drive control circuit. At the same time, the single-chip microcomputer main control circuit controls the motor drive circuit to stop running and issues an alarm through the fault indicator LED1. When repairing, it is only necessary to replace the cooling fan.

Brief Description of the Drawings

[0019] Figure 1 It is the structural block diagram of the drive control circuit;

[0020] Figure 2 This is the circuit schematic diagram of the power input circuit;

[0021] Figure 3 This is the circuit schematic diagram of the auxiliary power supply circuit;

[0022] Figure 4 This is the circuit schematic diagram of the single chip microcomputer main control circuit and the voltage limiting protection circuit;

[0023] Figure 5 This is the circuit schematic diagram of the input voltage detection circuit;

[0024] Figure 6 This is the circuit schematic diagram of the motor drive circuit and the motor current detection circuit;

[0025] Figure 7 This is the circuit schematic diagram of the fan speed control circuit and the fan current detection circuit;

[0026] Figure 8 This is the circuit schematic diagram of the refrigerator temperature detection circuit;

[0027] Figure 9 This is the circuit schematic diagram of the motor temperature detection circuit

[0028] Figure 10 This is the circuit schematic diagram of the external connection port.

[0029] In the figure: 1 is the power input circuit; 2 is the RC filter circuit; 3 is the anti-reverse connection circuit; 4 is the auxiliary power circuit; 5 is the microcontroller main control circuit; 6 is the voltage limiting protection circuit; 7 is the motor drive circuit; 8 is the motor current detection circuit; 9 is the fan speed regulation circuit; 10 is the fan current detection circuit; 11 is the input voltage detection circuit; 12 is the refrigerator temperature detection circuit; 13 is the motor temperature detection circuit; 14 is the external connection port. [Specific implementation method]

[0030] The technical features of the present invention are further described in detail below with reference to the accompanying drawings so that those skilled in the art can understand them.

[0031] A drive control circuit for a vehicle refrigerator compressor, such as Figures 1 to 10 As shown, it includes a power input circuit 1, an auxiliary power circuit 4 and a single-chip main control circuit 5. The single-chip main control circuit 5 is electrically connected to a motor drive circuit 7 for efficiently driving the compressor motor and reducing heat. The motor drive circuit 7 is electrically connected to a motor current detection circuit 8 for detecting the compressor motor current and feeding back a signal to the single-chip main control circuit 5 to detect abnormal conditions. A voltage limiting protection circuit 6 for protecting the motor drive circuit 7 is provided between the power input circuit 1 and the single-chip main control circuit 5. The voltage limiting protection circuit 6 can prevent power surges from breaking down and damaging the MOS tube in the motor drive circuit 7. The single-chip main control circuit 5 is also electrically connected There is a fan speed control circuit 9 for driving and adjusting the cooling fan. The fan speed control circuit 9 is electrically connected to a fan current detection circuit 10 for detecting the cooling fan current and feeding back a signal to the single-chip main control circuit 5 to prevent damage to the external cooling fan from affecting the entire circuit board. When the cooling fan is damaged and a short circuit occurs, the fan current detection circuit 10 detects that the circuit current exceeds the threshold, the single-chip main control circuit 5 control loop is disconnected, and the current is grounded through other loops, which will not affect other parts of the drive control circuit. At the same time, the single-chip main control circuit 5 controls the motor drive circuit 7 to stop running and issues an alarm through the fault indicator LED1. During maintenance, only the cooling fan needs to be replaced.

[0032] Specifically, such as Figure 2As shown, the power input circuit 1 includes an RC filter circuit 2 and an anti-reverse connection circuit 3. The RC filter circuit 2 includes a negative input port X1 for connecting to the vehicle power supply, a positive input port X2 and a ground port X3. A fuse F1 is connected in series on the positive input port X2. The fuse F1 is used to ensure the final safety of the vehicle power supply and the drive control circuit to prevent excessive transient current in abnormal conditions and damage to electronic components. Capacitor C34 and resistor R15 are connected in series, capacitor C4 and resistor R11 are connected in series and are connected in parallel with a bidirectional breakdown diode D2 and a common-mode inductor L2 at the negative input. The anti-reverse connection circuit 3 includes a MOS transistor Q1, a drain D of the MOS transistor Q1 electrically connected to the negative input port X1, a voltage regulator diode DW1 and a resistor R13 connected in parallel between the gate G and the source S of the MOS transistor Q1, the gate G of the MOS transistor Q1 connected in series with a resistor R8 and then electrically connected to the positive input port X2, a polarity capacitor CE5 and a polarity capacitor CE7 connected in parallel between the negative input port X1 and the positive input port X2, and a polarity capacitor CE The negative pole of 5 is grounded, and the positive pole is the output terminal Vin of the power input circuit 1. When the positive and negative electrodes of the power supply are correctly connected, the MOS tube Q1 is turned on and the circuit is normal. When the positive and negative electrodes of the power supply are reversed, the MOS tube Q1 is turned off, the power circuit is disconnected, and the output terminal Vin is 0V. The existing filter circuit mostly adopts a single capacitor filter circuit and a multi-capacitor series filter circuit. When the power generated by the engine fluctuates or the high voltage spike generated by the input power breaks down the capacitor, the single capacitor filter circuit will cause a short circuit to damage the vehicle power system and the battery. The multi-capacitor series filter circuit will cause a short circuit after the capacitors are connected in series. This causes the capacitance to decrease, affecting the filtering effect. The RC filter circuit 2 has a resistor as a load, which can avoid short circuits and has a better filtering effect. Therefore, compared with the single-capacitor filter circuit and the multi-capacitor series filter circuit, it has better stability and safety. In addition, the RC filter circuit 2 adopts a common-mode inductor L2, which can effectively filter out the power peak at the input end, maintain stable output of voltage and current, and reduce the influence of external EMS; at the same time, the RC filter circuit 2 combined with the anti-reverse connection circuit 3 can effectively protect the circuit board of the entire drive control circuit and prevent the reverse connection of the power supply from burning electronic components.

[0033] In addition, if Figure 3As shown, the auxiliary power supply circuit 4 includes a constant voltage chip U1, and the pin 1 of the constant voltage chip U1 is connected in series with the magnetic bead RL1 and then electrically connected to the output terminal Vin of the power input circuit 1. The positive electrode of the polar capacitor CE3 is electrically connected to the output terminal Vin of the power input circuit 1 and the negative electrode is grounded. The capacitor C33 is connected in parallel with the polar capacitor CE3. The pins 4, 5, 6, 7, and 8 of the constant voltage chip U1 are grounded. The pin 2 of the constant voltage chip U1 is the output terminal and is connected in series with the inductor L1. It is electrically connected to pin 2 of the output port XS2, pin 1 of the output port XS2 is grounded, capacitor C1 and resistor R3 are connected in series and in parallel between pin 2 of the constant voltage chip U1 and the ground end, the positive pole of the voltage regulator diode D1 is grounded, and the negative pole is electrically connected to pin 2 of the constant voltage chip U1, resistors R1 and R2 are connected in series and in parallel with polarity capacitor CE4 and capacitor C2 between pin 1 and pin 2 of the output port XS2, and pin 3 of the constant voltage chip U1 is electrically connected between resistors R1 and R2.

[0034] Specifically, such as Figure 5 As shown, the power input circuit 1 is electrically connected to an input voltage detection circuit 11 for detecting the vehicle power voltage. The input voltage detection circuit 11 includes a sampling resistor R32. One end of a capacitor C17 and a resistor R36 are connected in parallel to both ends of the sampling resistor R32 and the other end is grounded. One end of the sampling resistor R32 is connected in series with a resistor R27 and then electrically connected to the output terminal Vin of the power input circuit 1. The other end of the sampling resistor R32 is a signal output terminal Vin-ad and is electrically connected to the single-chip microcomputer main control circuit 5. The positive electrode of the diode D13 is electrically connected to the signal output terminal Vin-ad, and the negative electrode is electrically connected to the output terminal of the auxiliary power circuit 4. The input voltage detection circuit 11 is used to detect the voltage of the vehicle power supply. When the voltage is lower than a set threshold, the drive control circuit does not operate and the compressor of the vehicle refrigerator does not work, thereby preventing the low voltage of the vehicle battery from affecting normal use of the vehicle.

[0035] Specifically, such as Figure 4As shown, the single-chip microcomputer main control circuit 5 includes a single-chip microcomputer chip U2 and a burning interface J2. Pin 1 of the single-chip microcomputer chip U2 is connected in series with a resistor R61 and a light-emitting diode LED1 and then electrically connected to the output end of the auxiliary power supply circuit 4. The pins of the single-chip microcomputer chip U2 are respectively electrically connected to the motor drive circuit 7, the motor current detection circuit 8, the fan speed control circuit 9, and the fan current detection circuit 10; the voltage limiting protection circuit 6 includes a voltage divider resistor R6, a transistor Q15 and a voltage regulator diode DW2 The collector C of the transistor Q15 is electrically connected to the output end of the power input circuit 1, the voltage dividing resistor R6 is connected in parallel between the base B and the emitter E of the transistor Q15, the base B of the transistor Q15 is connected in series with the capacitor C3 and then grounded, the voltage stabilizing diode DW2 is connected in parallel with the capacitor C3, the emitter E of the transistor Q15 is electrically connected to the pin 27 of the microcontroller chip U2 and is electrically connected to the positive electrode of the polarity capacitor CE1, the negative electrode of the polarity capacitor CE1 is grounded, the capacitor C28 is connected in parallel with the polarity capacitor CE1, the Schottky diodes D9 and D 11. D12 is connected in parallel and its positive electrode is electrically connected to the emitter E of the transistor Q15, and its negative electrode is connected in series with resistors R45, R46, and R47 respectively, and then electrically connected to pins 30, 26, and 23 of the microcontroller chip U2. One end of the bootstrap capacitors C23, C24, and C25 is connected in parallel with the resistors R45, R46, and R47 respectively. The other end of the bootstrap capacitors C23, C24, and C25 and pins 28 and 24 of the microcontroller chip U2 are electrically connected to the U, V, and W pins of the motor terminal respectively. Pins 28, 24, and 21 of chip U2 are used to detect the phase information of the motor operation to feedback and adjust the control signal of the motor drive circuit 7. When the power supply connected to the voltage limiting protection circuit 6 generates a high-voltage spike, the voltage-stabilizing diode DW2 is broken down and turned on, directly connected to ground, the base B voltage of the transistor Q15 is pulled down, the transistor Q15 is disconnected, and the motor drive circuit 7 stops running. When the spike is eliminated, the voltage-stabilizing diode DW2 returns to normal, the transistor Q15 is turned on, and the circuit continues to operate normally.

[0036] In addition, if Figure 6As shown, the motor drive circuit 7 includes MOS transistors Q3 and MOS transistors Q9 corresponding to the U pin of the motor terminal, MOS transistors Q5 and MOS transistors Q11 corresponding to the V pin, and MOS transistors Q7 and MOS transistors Q13 corresponding to the W pin. The source electrodes S of the MOS transistors Q3, MOS transistors Q5, and MOS transistors Q7 are electrically connected to the output end of the power input circuit 1. The drain electrodes D of the MOS transistors Q9, MOS transistors Q11, and MOS transistors Q13 are connected in series with a capacitor C35 and are electrically connected to the output end of the power input circuit 1 and to the motor current detection circuit 1. The detection circuit 8 is electrically connected, the drain D of the MOS transistor Q3 is electrically connected to the source S of the MOS transistor Q9 and is electrically connected to the U pin of the motor terminal, the gate G of the MOS transistor Q3 is electrically connected to the cathode of the diode D3, the anode of the diode D3 is connected in series with the resistor R17 and then electrically connected to the microcontroller main control circuit 5, the capacitor C12 and the resistor R23 are connected in parallel between the gate G and the drain D of the MOS transistor Q3 to form a filtering structure and a discharge circuit for reducing EMS interference, the base B of the transistor Q2 is electrically connected to the anode of the diode D3, and the collector C is connected in series with the resistor R62 The emitter collector E is electrically connected to one end of the capacitor C12, and the emitter collector E is electrically connected to the other end of the capacitor C12. The circuit structure of the MOS transistor Q9 is the same as that of the MOS transistor Q3. The circuit structure of the motor drive circuit 7 corresponding to the motor connection terminals V pin and W pin is the same as that of the U pin. Taking the MOS transistor Q3 and the transistor Q2 as an example, when the single-chip microcomputer main control circuit 5 outputs a shutdown level signal to the MOS transistor Q3, the transistor Q2 is turned on, and the two ends of the capacitor C12 form two discharge gates through the resistor R23, the resistor R62 and the transistor Q2 respectively. A discharge circuit is formed, thereby quickly lowering the voltage of the gate G of the MOS tube Q3, so that the MOS tube Q3 is quickly turned off. In the motor drive circuit 7, each MOS tube is provided with a filter capacitor and a discharge circuit connected in parallel with the filter capacitor, which can enhance the anti-EMS effect of the drive control circuit and reduce the electromagnetic interference generated by the motor drive circuit 7 itself. In addition, each MOS tube is also provided with a triode discharge circuit connected to the filter capacitor for accelerating the shutdown speed of the MOS tube, which can effectively improve the operating speed of the motor and reduce the heat generation of the motor.

[0037] The motor current detection circuit 8 includes shunt resistors RE1 and RE2. The shunt resistors RE1 and RE2 are connected in parallel with the capacitor C21. The two ends of the shunt resistor RE1 are respectively connected in series with resistors R40 and R42 and then electrically connected to the single-chip main control circuit 5. One end of the shunt resistor RE2 is grounded, and the other end is electrically connected to one end of the resistor R41 and the motor drive circuit 7. The other end of the resistor R41 is connected in series with the capacitor C22 and then grounded and electrically connected to the motor and the motor drive circuit 7. The motor current detection circuit 8 provides feedback on whether the motor is operating normally by detecting the magnitude of the motor current. When the motor encounters a large resistance during operation and the current increases to exceed the set threshold, the single-chip main control circuit 5 will control the motor drive circuit 7 and the compressor to stop running and restart after a period of time. If the startup fails multiple times, an alarm will be issued through the fault light LED1.

[0038] Specifically, such as Figure 7 As shown, the fan speed control circuit 9 includes a MOS transistor Q14 and a fan terminal XS4. Pin 1 of the fan terminal XS4 is connected in series with a magnetic bead RL2 and then electrically connected to the output end of the power input circuit 1 and the positive electrode of the polarity capacitor CE2. The magnetic bead RL2 can enhance the anti-EMS effect of the fan speed control circuit 9. The negative electrode of the polarity capacitor CE2 is grounded. The resistor R44 and the capacitor C26 are connected in series and then connected in parallel between pins 1 and pin 2 of the fan terminal XS4. The negative electrode of the Schottky diode D10 and the positive electrode of the polarity capacitor CE6 are electrically connected to pin 1 of the fan terminal XS4. The positive electrode of the polarity capacitor CE6 is electrically connected to pin 2 of the fan terminal XS4. The positive electrode of the Schottky diode D10 and pin 2 of the fan terminal XS4 are connected in series with an inductor L3 and then electrically connected to the source S of the MOS transistor Q14. The gate G of the MOS transistor Q14 is connected in series with a resistor R50. The inductor L3 is electrically connected to the single-chip microcomputer main control circuit 5, connected in series with a resistor R51, and then grounded. A terminal FANPWM at one end of the resistor R50 is used to input a PWM signal, and adjusts the operating power of the cooling fan by controlling the off frequency of the MOS transistor Q14. The drain D of the MOS transistor Q14 is connected in series with a resistor R52, then grounded, and the drain D is electrically connected to the fan current detection circuit 10. Two ends of the inductor L3 are electrically connected to a resistor R48 and one end of a sampling resistor R49, respectively. The other end of the resistor R48 is connected in series with a capacitor C30 and then grounded. The other end of the sampling resistor R49 is connected in series with a resistor R53, then grounded, and then electrically connected in series with a resistor R54, one end of the capacitor C31 and the single-chip microcomputer main control circuit 5. The other end of the capacitor C31 is grounded. The terminal FANV electrically connected to the single-chip microcomputer main control circuit 5 is used to output a voltage detection signal to determine whether the cooling fan is installed normally and whether the cooling fan is broken or damaged.

[0039] The fan current detection circuit 10 includes an operational amplifier U3, wherein pin 8 of the operational amplifier U3 is electrically connected to the output end of the auxiliary power supply circuit 4 and is electrically connected to pin 3 after being connected in series with a resistor R55. Pin 1 of the operational amplifier U3 is electrically connected to one end of resistors R57 and R58, the other end of the resistor R57 is electrically connected to the output end of the auxiliary power supply circuit 4, the other end of the resistor R58 is electrically connected to one end of a capacitor C29 and the single-chip main control circuit 5, a terminal FANI is used to output a current detection signal, and the other end of the capacitor C29 and pin 4 of the operational amplifier U3 are grounded. Pin 2 of the operational amplifier U3 is electrically connected to one end of the resistor R56 and the capacitor C32. The other end of the resistor R56 is electrically connected to the drain D of the MOS tube Q14 in the fan speed control circuit 9. The other end of the capacitor C32 is grounded. Pin 3 of the operational amplifier U3 is connected in series with the resistor R59 and then to ground. When the cooling fan is damaged and a short circuit occurs, the fan current detection circuit 10 detects that the circuit current exceeds the threshold. The single-chip microcomputer main control circuit 5 controls the loop where the MOS tube Q14 is located to be disconnected, and the current passes through the voltage-dividing resistors R49 and R53 and is then grounded, which will not affect other parts of the drive control circuit.

[0040] Specifically, such as Figure 8 As shown, the single-chip microcomputer main control circuit 5 is electrically connected to a refrigerator temperature detection circuit 12, and the refrigerator temperature detection circuit 12 includes a terminal XS3 for connecting a temperature sensor. Pin 1 of the terminal XS3 is connected in series with a resistor R4 and then electrically connected to the output end of the auxiliary power supply circuit 4. One end of the resistor R5 is electrically connected to pin 1 of the terminal XS3, and the other end is electrically connected to the single-chip microcomputer main control circuit 5 and one end of the capacitor C6. The other end of the capacitor C6 and the pin 2 of the terminal XS3 are grounded; the refrigerator temperature detection circuit 12 provides feedback to the single-chip microcomputer main control circuit 5 by detecting the internal temperature of the vehicle-mounted refrigerator, so that the motor drive circuit 7 is automatically started or stopped under the control of the single-chip microcomputer main control circuit 5, so as to control and adjust the working time and operating power of the compressor.

[0041] In addition, if Figure 9As shown, the single-chip main control circuit 5 is also electrically connected to a motor temperature detection circuit 13, and the motor temperature detection circuit 13 includes a thermistor NTC1. One end of the thermistor NTC1 is electrically connected to the output end of the auxiliary power supply circuit 4 and the single-chip main control circuit 5 after being connected in series with resistors R26 and R31. The other end of the thermistor NTC1 is grounded. One end of the capacitor C16 is electrically connected to the resistor R31 and the other end is grounded. The motor temperature detection circuit 13 can detect the temperature of the compressor during operation. The operating power of the cooling fan can be adjusted through feedback from the single-chip main control circuit 5 and the fan speed control circuit 9 to dissipate heat from the compressor in a timely manner. In addition, the motor temperature detection circuit 13 can prevent the compressor from overheating and extend the service life of the compressor.

[0042] In addition, if Figure 10 As shown, the drive control circuit is also provided with an external connection port 14 for connecting to the vehicle refrigerator operation panel, and the external connection port 14 includes a wiring terminal XS1, and pins 1 and 2 of the wiring terminal XS1 are respectively connected in series with resistors R10 and R9 and then electrically connected to the single-chip main control circuit 5, pin 3 of the wiring terminal XS1 is grounded, pin 4 is electrically connected to the output end of the auxiliary power supply circuit 4, and pin 5 is electrically connected to the output end of the power input circuit 1. The external connection port 14 can output a stable power supply to the outside, and at the same time communicate information with the single-chip main control circuit 5 through pins 1 and 2, so as to facilitate the electrical connection of modules such as the lighting system, display screen, and operation panel of the vehicle refrigerator.

[0043] The embodiments described in the present invention are merely descriptions of the preferred implementation methods of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should fall within the scope of protection of the present invention.

Claims

1. A drive control circuit for a vehicle refrigerator compressor, characterized in that: The invention comprises a power input circuit (1), an auxiliary power circuit (4) and a single-chip microcomputer main control circuit (5); the single-chip microcomputer main control circuit (5) is electrically connected to a motor drive circuit (7) for efficiently driving a compressor motor and reducing heat generation; the motor drive circuit (7) is electrically connected to a motor current detection circuit (8) for detecting the compressor motor current and feeding back a signal to the single-chip microcomputer main control circuit (5) to detect abnormal conditions; a voltage limiting protection circuit (6) for protecting the motor drive circuit (7) is provided between the power input circuit (1) and the single-chip microcomputer main control circuit (5); the single-chip microcomputer main control circuit (5) is also electrically connected to a fan speed control circuit (9) for driving and regulating a cooling fan; the fan speed control circuit (9) is electrically connected to a fan current detection circuit (10) for detecting the cooling fan current and feeding back a signal to the single-chip microcomputer main control circuit (5) to prevent the external cooling fan from damaging and affecting the entire circuit board.

2. The driving control circuit for a vehicle refrigerator compressor according to claim 1, characterized in that: The power input circuit (1) includes an RC filter circuit (2) and an anti-reverse connection circuit (3). The RC filter circuit (2) includes a negative input port X1 for connecting to a vehicle power supply, a positive input port X2, and a ground port X3. A fuse F1 is connected in series on the positive input port X2. A capacitor C34 and a resistor R15 are connected in series. A capacitor C4 and a resistor R11 are connected in series and are connected in parallel with a bidirectional breakdown diode D2 and a common-mode inductor L2 between the negative input port X1 and the positive input port X2. A capacitor C5 and a resistor R12 are connected in series and then connected in parallel with the common-mode inductor L2. The output end of L2; the anti-reverse connection circuit (3) includes a MOS tube Q1, the drain D of the MOS tube Q1 is electrically connected to the negative input port X1, the voltage stabilizing diode DW1 and the resistor R13 are connected in parallel between the gate G and the source S of the MOS tube Q1, the gate G of the MOS tube Q1 is connected in series with the resistor R8 and then electrically connected to the positive input port X2, the polarity capacitor CE5 and the polarity capacitor CE7 are connected in parallel between the negative input port X1 and the positive input port X2, the negative electrode of the polarity capacitor CE5 is grounded, and the positive electrode is the output end Vin of the power input circuit (1).

3. The driving control circuit for a vehicle refrigerator compressor according to claim 2, characterized in that: The auxiliary power supply circuit (4) includes a constant voltage chip U1, wherein pin 1 of the constant voltage chip U1 is connected in series with a magnetic bead RL1 and then electrically connected to the output terminal Vin of the power input circuit (1), the positive electrode of the polar capacitor CE3 is electrically connected to the output terminal Vin of the power input circuit (1) and the negative electrode is grounded, the capacitor C33 is connected in parallel with the polar capacitor CE3, the pins 4, 5, 6, 7 and 8 of the constant voltage chip U1 are grounded, and the pin 2 of the constant voltage chip U1 is the output terminal and is connected in series with the inductor L 1 is electrically connected to pin 2 of the output port XS2, pin 1 of the output port XS2 is grounded, capacitor C1 and resistor R3 are connected in series and then connected in parallel between pin 2 of the constant voltage chip U1 and the ground terminal, the positive electrode of the voltage regulator diode D1 is grounded, and the negative electrode is electrically connected to pin 2 of the constant voltage chip U1, resistors R1 and R2 are connected in series and then connected in parallel with polarity capacitor CE4 and capacitor C2 between pins 1 and pin 2 of the output port XS2, and pin 3 of the constant voltage chip U1 is electrically connected between resistors R1 and R2.

4. The driving control circuit for a vehicle refrigerator compressor according to claim 3, characterized in that: The power input circuit (1) is electrically connected to an input voltage detection circuit (11) for detecting the vehicle power supply voltage. The input voltage detection circuit (11) includes a sampling resistor R32, a capacitor C17, and one end of a resistor R36 are connected in parallel to both ends of the sampling resistor R32 and the other end is grounded. One end of the sampling resistor R32 is connected in series with a resistor R27 and then electrically connected to the output end Vin of the power input circuit (1). The other end of the sampling resistor R32 is a signal output end Vin-ad and is electrically connected to the single-chip computer main control circuit (5). The positive electrode of the diode D13 is electrically connected to the signal output end Vin-ad, and the negative electrode is electrically connected to the output end of the auxiliary power circuit (4).

5. The driving control circuit for a vehicle refrigerator compressor according to claim 1, characterized in that: The single-chip microcomputer main control circuit (5) includes a single-chip microcomputer chip U2 and a burning interface J2. Pin 1 of the single-chip microcomputer chip U2 is connected in series with a resistor R61 and a light-emitting diode LED1 and then electrically connected to the output end of the auxiliary power supply circuit (4). The pins of the single-chip microcomputer chip U2 are respectively electrically connected to the motor drive circuit (7), the motor current detection circuit (8), the fan speed control circuit (9), and the fan current detection circuit (10). The voltage limiting protection circuit (6) includes a voltage dividing resistor R6, a transistor Q15, and a voltage stabilizing diode DW2. The collector C of the transistor Q15 is electrically connected to the output end of the power input circuit (1). The voltage dividing resistor R6 is connected in parallel between the base B and the emitter E of the transistor Q15. The base B of the transistor Q15 is connected in series with a capacitor C3 and then grounded. The voltage stabilizing diode DW2 is connected in series with the capacitor C3. Tube DW2 is connected in parallel with capacitor C3, the emitter collector E of transistor Q15 is electrically connected to pin 27 of microcontroller chip U2 and to the positive electrode of polarity capacitor CE1, the negative electrode of polarity capacitor CE1 is grounded, capacitor C28 is connected in parallel with polarity capacitor CE1, Schottky diodes D9, D11, and D12 are connected in parallel with the positive electrode electrically connected to the emitter collector E of transistor Q15, and the negative electrode is connected in series with resistors R45, R46, and R47 respectively, and then electrically connected to pin 30, pin 26, and pin 23 of microcontroller chip U2, one end of bootstrap capacitors C23, C24, and C25 are connected in parallel with resistors R45, R46, and R47 respectively, and the other end of bootstrap capacitors C23, C24, and C25 and pin 28, pin 24, and pin 21 of microcontroller chip U2 are electrically connected to U, V, and W pins of the motor terminal respectively.

6. The driving control circuit for a vehicle refrigerator compressor according to claim 1, characterized in that: The motor drive circuit (7) includes MOS transistors Q3 and Q9 corresponding to the U pin of the motor connection terminal, MOS transistors Q5 and Q11 corresponding to the V pin, and MOS transistors Q7 and Q13 corresponding to the W pin. The source electrodes S of the MOS transistors Q3, Q5, and Q7 are electrically connected to the output end of the power input circuit (1). The drain electrodes D of the MOS transistors Q9, Q11, and Q13 are connected in series with a capacitor C35 and then electrically connected to the output end of the power input circuit (1) and the motor current detection circuit (8). The drain electrode D of the MOS transistor Q3 is electrically connected to the source electrode S of the MOS transistor Q9 and is also electrically connected to the U pin of the motor connection terminal. The gate electrode G of the MOS transistor Q3 is electrically connected to the negative electrode of the diode D3. The positive electrode of the diode D3 is connected in series with a resistor R17 and then electrically connected to the single-chip computer main control circuit (5). The capacitor C12 and the resistor R23 are connected in parallel between the gate electrode G and the drain electrode D of the MOS transistor Q3 to form The filter structure and discharge circuit for reducing EMS interference are as follows: the base B of the transistor Q2 is electrically connected to the positive electrode of the diode D3; the collector C is connected in series with the resistor R62 and then electrically connected to one end of the capacitor C12; the emitter E is electrically connected to the other end of the capacitor C12; the circuit structure of the MOS transistor Q9 is the same as that of the MOS transistor Q3; the circuit structure of the motor connection terminals V and W in the motor drive circuit (7) is the same as that of the U pin; the motor current detection circuit (8) includes shunt resistors RE1 and RE2; the shunt resistors RE1 and RE2 are connected in parallel with the capacitor C21; the two ends of the shunt resistor RE1 are connected in series with the resistor R40 and the resistor R42 respectively and then electrically connected to the single-chip computer main control circuit (5); one end of the shunt resistor RE2 is grounded and the other end is electrically connected to one end of the resistor R41 and the motor drive circuit (7); the other end of the resistor R41 is connected in series with the capacitor C22 and then grounded and electrically connected to the motor and the motor drive circuit (7).

7. The driving control circuit for a vehicle refrigerator compressor according to claim 1, characterized in that: The fan speed control circuit (9) includes a MOS tube Q14 and a fan terminal XS4. Pin 1 of the fan terminal XS4 is connected in series with a magnetic bead RL2 and then electrically connected to the output end of the power input circuit (1) and the positive electrode of the polarity capacitor CE2. The negative electrode of the polarity capacitor CE2 is grounded. A resistor R44 and a capacitor C26 are connected in series and then in parallel between pins 1 and 2 of the fan terminal XS4. The negative electrode of the Schottky diode D10 and the positive electrode of the polarity capacitor CE6 are electrically connected to pin 1 of the fan terminal XS4. The positive electrode of the polarity capacitor CE6 is electrically connected to the fan terminal XS4. Pin 2 of the terminal XS4 is electrically connected, the positive electrode of the Schottky diode D10 and the pin 2 of the fan terminal XS4 are connected in series with the inductor L3 and then electrically connected to the source S of the MOS tube Q14, the gate G of the MOS tube Q14 is connected in series with the resistor R50 and then electrically connected to the single chip main control circuit (5), and then connected in series with the resistor R51 and then grounded, the drain D of the MOS tube Q14 is connected in series with the resistor R52 and then grounded, and the drain D is electrically connected to the fan current detection circuit (10), the two ends of the inductor L3 are respectively electrically connected to the resistor R48 and one end of the sampling resistor R49, and the resistor R51 is connected in series with the gate G of the MOS tube Q14. The other end of R48 is connected in series with capacitor C30 and then grounded, the other end of the sampling resistor R49 is connected in series with resistor R53 and then grounded, and connected in series with resistor R54 and then electrically connected to one end of capacitor C31 and the single chip main control circuit (5), and the other end of capacitor C31 is grounded; the fan current detection circuit (10) includes an operational amplifier U3, pin 8 of the operational amplifier U3 is electrically connected to the output end of the auxiliary power supply circuit (4) and connected in series with resistor R55 and then electrically connected to pin 3, and pin 1 of the operational amplifier U3 is electrically connected to one end of resistors R57 and R58. The other end of the resistor R57 is electrically connected to the output end of the auxiliary power supply circuit (4), the other end of the resistor R58 is electrically connected to one end of the capacitor C29 and the single-chip main control circuit (5), the other end of the capacitor C29 and the pin 4 of the operational amplifier U3 are grounded, the pin 2 of the operational amplifier U3 is electrically connected to the resistor R56 and one end of the capacitor C32, the other end of the resistor R56 is electrically connected to the drain D of the MOS tube Q14 in the fan speed control circuit (9), the other end of the capacitor C32 is grounded, and the pin 3 of the operational amplifier U3 is connected in series with the resistor R59 and then grounded.

8. The driving control circuit for a vehicle refrigerator compressor according to claim 1, characterized in that: The single-chip main control circuit (5) is electrically connected to a refrigerator temperature detection circuit (12), and the refrigerator temperature detection circuit (12) includes a terminal XS3 for connecting a temperature sensor, a pin 1 of the terminal XS3 is connected in series with a resistor R4 and then electrically connected to the output end of the auxiliary power supply circuit (4), one end of the resistor R5 is electrically connected to the pin 1 of the terminal XS3, and the other end is electrically connected to the single-chip main control circuit (5) and one end of a capacitor C6, and the other end of the capacitor C6 and the pin 2 of the terminal XS3 are grounded.

9. The driving control circuit for a vehicle refrigerator compressor according to claim 1, characterized in that: The single-chip main control circuit (5) is also electrically connected to a motor temperature detection circuit (13), and the motor temperature detection circuit (13) includes a thermistor NTC1. One end of the thermistor NTC1 is connected in series with a resistor R26 and a resistor R31, and then electrically connected to the output end of the auxiliary power supply circuit (4) and the single-chip main control circuit (5). The other end of the thermistor NTC1 is grounded. One end of the capacitor C16 is electrically connected to the resistor R31, and the other end is grounded.

10. The driving control circuit for a vehicle refrigerator compressor according to claim 1, characterized in that: The drive control circuit is further provided with an external connection port (14) for connecting to an operation panel of the vehicle refrigerator. The external connection port (14) includes a connection terminal XS1. Pins 1 and 2 of the connection terminal XS1 are respectively connected in series with a resistor R10 and a resistor R9 and then electrically connected to the single-chip computer main control circuit (5). Pin 3 of the connection terminal XS1 is grounded, pin 4 is electrically connected to the output end of the auxiliary power supply circuit (4), and pin 5 is electrically connected to the output end of the power input circuit (1).

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