Air conditioner and air conditioner outdoor unit control circuit thereof

Abstract

The utility model relates to an air conditioner and an air conditioner outdoor unit control circuit thereof, and the circuit comprises a temperature measuring unit which is used for measuring the outdoor environment temperature and outputting an environment temperature signal; the input end of the bidirectional switch unit is connected with the temperature measuring unit, the input end and the output end of the bidirectional switch unit are in forward conduction when the control end of the bidirectional switch unit receives the forward conduction signal, and the input end and the output end of the bidirectional switch unit are in reverse conduction when the voltage of the environment temperature signal is suddenly reduced due to the sudden drop of the outdoor environment temperature; the signal temporary storage unit is connected with the output end of the bidirectional switch unit and is used for temporarily storing an environment temperature signal output when the input end and the output end of the bidirectional switch unit are positively conducted; and the control unit is connected with the signal temporary storage unit and is used for outputting the forward conduction signal, receiving the temporarily stored environment temperature signal and controlling the fan to work. The control unit can control the rotating speed of the fan more accurately, and the power consumption of the air conditioner is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an air conditioner and a control circuit of an air conditioner outdoor unit thereof. Background Art

[0002] In the related art, the fan speed in the outdoor unit of the air conditioner is not only related to the load of the air conditioner, but also to the outdoor ambient temperature where the fan is located. However, the outdoor ambient temperature is usually measured by a temperature sensor installed on the outdoor unit. However, when the air conditioner switches from a cold machine to a hot machine, the temperature of the outdoor unit will rise with the heat generated by the electromechanical components, so that the temperature sensor's detection of the outdoor ambient temperature is usually higher than the actual ambient temperature, causing the fan to increase its speed in order to improve the heat dissipation performance, thereby increasing the power consumption of the air conditioner. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an air conditioner and an air conditioner outdoor unit control circuit thereof.

[0004] The technical solution adopted by the utility model to solve the technical problem is: constructing an air conditioner outdoor unit control circuit for controlling the operation of a fan in the air conditioner outdoor unit according to the outdoor ambient temperature, the air conditioner outdoor unit control circuit comprising:

[0005] A temperature measuring unit, used to measure the outdoor ambient temperature and output an ambient temperature signal;

[0006] A bidirectional switch unit, whose input end is connected to the temperature measurement unit, whose control end forward conducts the input end and the output end when receiving the forward conduction signal, and reverse conducts the input end and the output end when the voltage of the ambient temperature signal drops suddenly due to the sudden drop of the outdoor ambient temperature;

[0007] a signal temporary storage unit connected to the output end of the bidirectional switch unit and used for temporarily storing the ambient temperature signal output when the input end and the output end of the bidirectional switch unit are forwardly connected; and

[0008] The control unit is connected to the signal temporary storage unit, and is used to output the forward conduction signal, receive the temporarily stored ambient temperature signal, and control the operation of the fan.

[0009] Preferably, the bidirectional switch unit includes an NMOS tube Q1 including a body diode; the gate of the NMOS tube Q1 is connected to the control unit to receive the forward conduction signal, the drain of the NMOS tube Q1 is connected to the temperature measurement unit to receive the ambient temperature signal, and the source of the NMOS tube Q1 is connected to the signal storage unit to input the ambient temperature signal to the signal storage unit when it is turned on.

[0010] Preferably, the bidirectional switch unit includes a switch tube and a diode;

[0011] The control end of the switch tube is connected to the control unit to receive the forward conduction signal, the input end of the switch tube is connected to the cathode of the diode and then connected to the temperature measurement unit to receive the ambient temperature signal, and the output end of the switch tube is connected to the anode of the diode and then connected to the signal storage unit to input the ambient temperature signal to the signal storage unit when the switch tube is turned on.

[0012] Preferably, the signal temporary storage unit includes:

[0013] an energy storage unit connected to the output end of the bidirectional switch unit, and used to charge and store energy when the input end and the output end of the bidirectional switch unit are forwardly conducted, so as to delay the voltage drop speed of the output end of the bidirectional switch unit after the input end and the output end of the bidirectional switch unit are turned off; and

[0014] A voltage follower is connected between the energy storage unit and the control unit, and is used to increase the discharge impedance of the energy storage unit after the input end and the output end of the bidirectional switch unit are turned off.

[0015] Preferably, the energy storage unit comprises a third capacitor C3; and the output end of the bidirectional switch unit is connected to the ground via the third capacitor C3.

[0016] Preferably, the voltage follower includes a second operational amplifier U2 and a fourth capacitor C4; the positive phase input terminal of the second operational amplifier U2 is connected to the energy storage unit, the negative phase input terminal of the second operational amplifier U2 is connected to the output terminal of the second operational amplifier U2, the output terminal of the second operational amplifier U2 is also connected to the control unit, and the output terminal of the second operational amplifier U2 is connected to the ground via the fourth capacitor C4.

[0017] Preferably, the temperature measurement unit includes a first resistor R1, a second resistor R2 and a thermistor CT1; the first ends of the first resistor R1 and the second resistor R2 are connected to a DC voltage, the second ends of the first resistor R1 and the second resistor R2 are connected to ground via the thermistor CT1, and the connection node between the second resistor R2 and the thermistor CT1 is connected to the input end of the bidirectional switch unit.

[0018] Preferably, the air conditioner outdoor unit control circuit further includes:

[0019] The signal amplifying unit is connected between the temperature measuring unit and the bidirectional switch unit, and is used to amplify the ambient temperature signal output by the temperature measuring unit, and input the amplified ambient temperature signal to the input end of the bidirectional switch unit.

[0020] Preferably, the signal amplifying unit includes a first operational amplifier U1, a fourth resistor R4, a fifth resistor R5 and a second capacitor C2; the positive phase input terminal of the first operational amplifier U1 is connected to the temperature measurement unit, the negative phase input terminal of the first operational amplifier U1 is connected to the ground via the fourth resistor R4 in one path and to the output terminal of the first operational amplifier U1 via the fifth resistor R5 in another path, and the output terminal of the first operational amplifier U1 is connected to the input terminal of the bidirectional switch unit and is connected to the ground via the second capacitor C2.

[0021] The utility model also constructs an air conditioner, which comprises the above-mentioned air conditioner outdoor unit control circuit.

[0022] The implementation of the utility model has the following beneficial effects: it helps the control unit obtain a measured temperature that is closer to the actual outdoor ambient temperature, so that the control unit can more accurately control the fan speed, avoiding an inflated fan speed caused by an inflated measured value of the outdoor ambient temperature, thereby reducing the power consumption of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0024] Figure 1 It is a circuit structure block diagram of the air conditioner outdoor unit control circuit in some embodiments of the utility model;

[0025] Figure 2 is a circuit schematic diagram of a temperature measurement unit in some embodiments of the utility model;

[0026] Figure 3 It is a circuit schematic diagram of a bidirectional switch unit and a signal temporary storage unit in some embodiments of the utility model;

[0027] Figure 4 is a circuit schematic diagram of a bidirectional switch unit in some other embodiments of the utility model;

[0028] Figure 5 It is a circuit schematic diagram of the signal amplification unit in some embodiments of the utility model. DETAILED DESCRIPTION

[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0030] like Figure 1As shown, the utility model provides an air conditioner outdoor unit control circuit. The air conditioner outdoor unit control circuit is applied to an air conditioner, wherein the air conditioner includes an air conditioner outdoor unit, and the air conditioner outdoor unit includes a fan and a fan drive circuit for controlling the operation of the fan (including controlling the start and stop and speed of the fan). The circuit can more accurately control the operation of the fan in the air conditioner outdoor unit according to the outdoor ambient temperature, and can avoid the increase of air conditioner power consumption due to the false high fan speed. Figure 1 The air conditioner outdoor unit control circuit includes a temperature measurement unit 1, a bidirectional switch unit 2, a signal temporary storage unit 3 and a control unit 4.

[0031] The temperature measurement unit 1 is used to measure the outdoor ambient temperature and output an ambient temperature signal that can represent the outdoor ambient temperature.

[0032] In some embodiments, Figure 2 As shown, the temperature measurement unit 1 may include a first resistor R1, a second resistor R2, a thermistor CT1 and a first capacitor C1. A first end of the first resistor R1 and a first end of the second resistor R2 are connected to a DC voltage, a node after the second end of the first resistor R1 and the second end of the second resistor R2 are connected to the ground through the thermistor CT1 in one path and to the ground through the first capacitor C1 in another path, and a connection node between the second resistor R2 and the thermistor CT1 is connected to an input end of the bidirectional switch unit 2 to input the ambient temperature signal to the bidirectional switch unit 2.

[0033] In this embodiment, the thermistor CT1 can be a PTC thermistor, and the first resistor R1, the second resistor R2 and the thermistor CT1 form a voltage divider circuit for dividing the DC voltage. The thermistor CT1 is set in an outdoor environment, so that the thermistor CT1 will increase with the increase of the outdoor ambient temperature, that is, the voltage value of the ambient temperature signal will increase with the increase of the outdoor ambient temperature. Among them, the first capacitor C1 plays a role in filtering the ambient temperature signal, which can improve the reliability of the ambient temperature signal. In addition, the DC voltage can be provided by an existing DC source or a voltage conversion circuit, which is not limited here.

[0034] The input end of the bidirectional switch unit 2 is connected to the temperature measuring unit 1. When the control end of the bidirectional switch unit 2 receives a forward conduction signal, the input end of the bidirectional switch unit 2 and the output end of the bidirectional switch unit 2 are forward conducted to output the ambient temperature signal through the output end of the bidirectional switch unit 2. When the ambient temperature signal drops sharply due to a sudden drop in outdoor ambient temperature and the voltage drops sharply, the input end of the bidirectional switch unit 2 and the output end of the bidirectional switch unit 2 are reverse conducted. Specifically, when the bidirectional switch unit 2 receives the forward conduction signal output by the control unit 4, the input and output ends of the bidirectional switch unit 2 are forwardly conducted, that is, the ambient temperature signal flows in from the input end of the bidirectional switch unit 2, and flows out from the output end of the bidirectional switch unit 2 to the signal temporary storage unit 3; and when the outdoor ambient temperature changes suddenly, such as sudden rain or a sudden drop in cold air, the outdoor ambient temperature will drop suddenly. Taking the thermistor CT1 as a PTC thermistor as an example, the voltage value of the ambient temperature signal output by the temperature measurement unit 1 will drop sharply as the outdoor ambient temperature drops suddenly. At this time, the input and output ends of the bidirectional switch unit 2 are reversely conducted, that is, the ambient temperature signal temporarily stored by the signal temporary storage unit 3 will flow in from the output end of the bidirectional switch unit 2, and flow out from the input end of the bidirectional switch unit 2, so that the voltage of the temporarily stored ambient temperature signal immediately decreases as the outdoor ambient temperature drops suddenly, thereby avoiding the control unit 4 from controlling the fan speed with the temporarily stored and high ambient temperature signal.

[0035] In some embodiments, Figure 3 As shown, the bidirectional switch unit 2 includes a seventh resistor, an NMOS transistor Q1 including a body diode, and a ninth resistor R9. The gate of the NMOS transistor Q1 is connected to the control unit 4 as the control end of the bidirectional switch unit 2 to receive the forward conduction signal S1, the gate of the NMOS transistor Q1 is also connected to the ground via the ninth resistor R9, the drain of the NMOS transistor Q1 is connected to the temperature measurement unit 1 via the seventh resistor R7 as the input end of the bidirectional switch unit 2 to receive the ambient temperature signal output by the temperature measurement unit 1, and the source of the NMOS transistor Q1 is connected to the signal temporary storage unit 3 as the output end of the bidirectional switch unit 2 to input the ambient temperature signal to the signal temporary storage unit 3 when it is turned on.

[0036] In the present embodiment, when the gate of the NMOS tube Q1 receives the forward conduction signal S1 (high level), the NMOS tube Q1 is turned on, so that the ambient temperature signal can be input into the signal temporary storage unit 3. When the outdoor ambient temperature drops suddenly, due to the sudden drop in the voltage value of the ambient temperature signal, the drain voltage of the NMOS tube Q1 is significantly smaller than the source voltage of the NMOS tube Q1, so that the body diode in the NMOS tube Q1 is turned on. At this time, the ambient temperature signal temporarily stored in the signal temporary storage unit 3 is quickly released, and the voltage drops to a voltage value slightly higher than the ambient temperature signal input to the drain of the NMOS tube Q1, thereby avoiding the outdoor ambient temperature being measured to be falsely high. Furthermore, considering that the conduction voltage drop of the body diode is relatively high, in order to obtain the outdoor ambient temperature more accurately, when the control unit 4 detects that the voltage of the acquired ambient temperature signal suddenly drops, it can output a forward conduction signal S1 to the gate of the NMOS tube Q1, and utilize the advantage of the lower forward conduction voltage drop of the NMOS tube Q1. In this way, the ambient temperature signal to be temporarily stored in the signal temporary storage unit 3 can be updated to reduce the voltage difference between the temporarily stored ambient temperature signal and the ambient temperature signal input to the gate of the NMOS tube Q1, thereby minimizing the problem of falsely high outdoor ambient temperature measurement.

[0037] In other embodiments, Figure 4 As shown, the bidirectional switch unit 2 may further include a switch tube Q2 and a diode D1. The control end of the switch tube Q2 is connected to the control unit 4 to receive the forward conduction signal S1, the input end of the switch tube Q2 is connected to the cathode of the diode D1 and then connected to the temperature measurement unit 1 to receive the ambient temperature signal, and the output end of the switch tube Q2 is connected to the anode of the diode D1 and then connected to the signal temporary storage unit 3 to input the ambient temperature signal to the signal temporary storage unit 3 when the switch tube Q2 is turned on.

[0038] It can be understood that the circuit composed of the switch tube Q2 and the diode D1 in this embodiment can directly replace Figure 3 The NMOS transistor Q1 having a body diode in the embodiment has the advantage that the body diode can be replaced by a diode D1 having a lower on-state voltage drop, thereby reducing the measurement error of the ambient temperature signal.

[0039] The signal temporary storage unit 3 is connected to the output end of the bidirectional switch unit 2, and the signal temporary storage unit 3 is used to temporarily store the ambient temperature signal output when the input end and the output end of the bidirectional switch unit 2 are forwardly conducted. Specifically, when the input end and the output end of the bidirectional switch unit 2 are turned off, the signal temporary storage unit 3 will continue to output the temporarily stored ambient temperature signal to the control unit 4. It should be noted that during the period when the input end and the output end of the bidirectional switch unit 2 are turned off, unless the voltage of the ambient temperature signal output by the temperature measurement unit 1 drops sharply, the ambient temperature signal temporarily stored by the signal temporary storage unit 3 cannot be affected by the ambient temperature signal output by the temperature measurement unit 1, that is, when the air conditioner is just started, the signal temporary storage unit 3 temporarily stores the outdoor ambient temperature (or ambient temperature signal) when the air conditioner is just started, which is closest to the actual outdoor ambient temperature. Therefore, the control unit 4 uses the ambient temperature signal to control the speed of the fan with greater accuracy.

[0040] In some embodiments, Figure 3 As shown, the signal temporary storage unit 3 includes an energy storage unit and a voltage follower.

[0041] The energy storage unit is connected to the output end of the bidirectional switch unit 2. The energy storage unit is used to charge and store energy when the input and output ends of the bidirectional switch unit 2 are forward-conducted, so as to slow down the voltage drop speed of the output end of the bidirectional switch unit 2 after the input and output ends of the bidirectional switch unit 2 are turned off.

[0042] In some embodiments, Figure 3 As shown, the energy storage unit may include a third capacitor C3. The output end of the bidirectional switch unit 2 is connected to the ground via the third capacitor C3. In this embodiment, when the input end and the output end of the bidirectional switch unit 2 are forward-conducted, the ambient temperature signal output from the bidirectional switch unit 2 will quickly charge the third capacitor C3 until it is charged to a value close to the ambient temperature signal voltage. After the input end and the output end of the bidirectional switch unit 2 are turned off, under the action of the third capacitor C3, the voltage drop speed of the ambient temperature signal output from the output end of the bidirectional switch unit 2 is slowed down, thereby achieving a temporary storage effect. In addition, it should be noted that the seventh resistor R7 in the bidirectional switch unit 2 plays a current limiting role, which can prevent the charging current input to the third capacitor C3 from being too large.

[0043] The voltage follower is connected between the energy storage unit and the control unit 4, and is used to increase the discharge impedance of the energy storage unit after the input and output ends of the bidirectional switch unit 2 are turned off. It can be understood that the voltage follower has a very high input impedance, which can further delay the discharge efficiency of the energy storage unit and make the temporary storage time of the ambient temperature signal longer (generally up to half an hour).

[0044] In some embodiments, Figure 3As shown, the voltage follower may include a second operational amplifier U2, an eighth resistor R8, a tenth resistor R10 and a fourth capacitor C4. The positive phase input terminal of the second operational amplifier U2 is connected to the energy storage unit via the eighth resistor R8, the negative phase input terminal of the second operational amplifier U2 is connected to the output terminal of the second operational amplifier U2 via the tenth resistor R10, the output terminal of the second operational amplifier U2 is also connected to the control unit 4, and the output terminal of the second operational amplifier U2 is connected to the ground via the fourth capacitor C4.

[0045] In this embodiment, the eighth resistor R8 can further increase the input impedance of the non-inverting input terminal of the second operational amplifier U2, and can further slow down the discharge speed of the energy storage unit (i.e., the third capacitor C3). The tenth resistor R10 can improve the accuracy of the voltage outputted from the output terminal of the voltage follower (i.e., the voltage of the temporarily stored ambient temperature signal Outdoor_T). The fourth capacitor C4 plays a filtering role, and can improve the stability of the temporarily stored ambient temperature signal Outdoor_T.

[0046] The control unit 4 is connected to the signal temporary storage unit 3, and the control unit 4 is used to output the forward conduction signal S1 and receive the temporarily stored ambient temperature signal Outdoor_T and control the operation of the fan (including controlling the speed of the fan). Specifically, the control unit 4 can be an existing control circuit set in the outdoor unit of the air conditioner, which is not limited here. In addition, considering that the outdoor ambient temperature will not only change with the weather, but also with time, in order to obtain a more accurate ambient temperature signal, the forward conduction signal S1 can be configured as a periodic signal, such as the control unit 4 outputs a forward conduction signal S1 lasting three seconds every half an hour, and the control unit 4 can also compensate for the subsequently obtained ambient temperature signal based on the temporarily stored ambient temperature signal obtained after the forward conduction signal S1 is output for the first and second times after the air conditioner is started for the first time.

[0047] In some embodiments, Figure 1 As shown, the air conditioner outdoor unit control circuit also includes a signal amplifying unit 5. The signal amplifying unit 5 is connected between the temperature measuring unit 1 and the bidirectional switch unit 2, and can amplify the ambient temperature signal output by the temperature measuring unit 1, and input the amplified ambient temperature signal to the input end of the bidirectional switch unit 2. In this embodiment, the signal amplifying unit 5 is used to amplify the ambient temperature signal on the one hand to improve the accuracy of the ambient temperature signal in representing the outdoor ambient temperature, and on the other hand to improve the driving ability of the ambient temperature signal to ensure that the ambient temperature signal has sufficient driving force, so that the energy storage unit is charged to a voltage value close to the ambient temperature signal, that is, the ambient temperature signal temporarily stored in the signal temporary storage unit 3 can be prevented from being distorted.

[0048] In some embodiments, Figure 5As shown, the signal amplification unit 5 may include a first operational amplifier U1, a fourth resistor R4, a fifth resistor R5, and a second capacitor C2. The positive phase input terminal of the first operational amplifier U1 is connected to the temperature measurement unit 1, the negative phase input terminal of the first operational amplifier U1 is connected to the ground through the fourth resistor R4, and the other is connected to the output terminal of the first operational amplifier U1 through the fifth resistor R5, and the output terminal of the first operational amplifier U1 is connected to the input terminal of the bidirectional switch unit 2 and connected to the ground through the second capacitor C2.

[0049] In this embodiment, the first operational amplifier U1, the fourth resistor R4 and the fifth resistor R5 form a common-mode amplifier circuit, which can amplify the voltage value of the ambient temperature signal output by the temperature measurement unit 1, and the second capacitor C2 plays a filtering role, which can improve the reliability of the amplified ambient temperature signal.

[0050] The utility model also provides an air conditioner, comprising the air conditioner outdoor unit control circuit provided by the embodiment of the utility model.

[0051] It can be understood that the utility model measures the outdoor ambient temperature through the temperature measuring unit and outputs the ambient temperature signal, and then when the control unit outputs the forward conduction signal, the ambient temperature signal is input into the signal storage unit through the bidirectional switch unit, so as to use the signal storage unit to temporarily store the ambient temperature signal, thereby avoiding the situation where the ambient temperature signal causes the measured value to be falsely high due to the heat of the air-conditioning outdoor unit, and when the ambient temperature signal voltage drops suddenly due to the sudden drop in the outdoor ambient temperature, the input and output ends of the bidirectional switch unit will reverse conduct, avoiding the ambient temperature signal from remaining in a falsely high state. Furthermore, the utility model helps the control unit to obtain a measured temperature that is closer to the actual outdoor ambient temperature, so that the control unit can control the fan speed more accurately, avoiding the fan speed being falsely high due to the falsely high measured value of the outdoor ambient temperature, thereby reducing the power consumption of the air conditioner.

[0052] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. An air conditioner outdoor unit control circuit, used to control the operation of a fan in the air conditioner outdoor unit according to the outdoor ambient temperature, characterized in that: The air conditioner outdoor unit control circuit comprises: A temperature measuring unit (1), used for measuring the outdoor ambient temperature and outputting an ambient temperature signal; A bidirectional switch unit (2), whose input end is connected to the temperature measurement unit (1), whose control end forward conducts the input end and the output end when receiving a forward conduction signal, and reverse conducts the input end and the output end when the voltage of the ambient temperature signal drops suddenly due to a sudden drop in the outdoor ambient temperature; A signal temporary storage unit (3) connected to the output end of the bidirectional switch unit (2) and used for temporarily storing an ambient temperature signal output when the input end and the output end of the bidirectional switch unit (2) are forwardly connected; and The control unit (4) is connected to the signal temporary storage unit (3) and is used to output the forward conduction signal, receive the temporarily stored ambient temperature signal, and control the operation of the fan.

2. The air conditioner outdoor unit control circuit according to claim 1, characterized in that: The bidirectional switch unit (2) comprises an NMOS tube Q1 including a body diode; the gate of the NMOS tube Q1 is connected to the control unit (4) to receive the forward conduction signal, the drain of the NMOS tube Q1 is connected to the temperature measurement unit (1) to receive the ambient temperature signal, and the source of the NMOS tube Q1 is connected to the signal temporary storage unit (3) to input the ambient temperature signal to the signal temporary storage unit (3) when conducting.

3. The air conditioner outdoor unit control circuit according to claim 1, characterized in that: The bidirectional switch unit (2) comprises a switch tube and a diode; The control end of the switch tube is connected to the control unit (4) to receive the forward conduction signal, the input end of the switch tube is connected to the cathode of the diode and then connected to the temperature measurement unit (1) to receive the ambient temperature signal, and the output end of the switch tube is connected to the anode of the diode and then connected to the signal temporary storage unit (3) to input the ambient temperature signal to the signal temporary storage unit (3) when the switch tube is turned on.

4. The air conditioner outdoor unit control circuit according to claim 1, characterized in that: The signal temporary storage unit (3) comprises: an energy storage unit connected to the output end of the bidirectional switch unit (2) and used to charge and store energy when the input end and the output end of the bidirectional switch unit (2) are forwardly conducted, so as to slow down the voltage drop speed of the output end of the bidirectional switch unit (2) after the input end and the output end of the bidirectional switch unit (2) are turned off; and A voltage follower is connected between the energy storage unit and the control unit (4) and is used to increase the discharge impedance of the energy storage unit after the input end and the output end of the bidirectional switch unit (2) are turned off.

5. The air conditioner outdoor unit control circuit according to claim 4, characterized in that: The energy storage unit comprises a third capacitor C3; the output end of the bidirectional switch unit (2) is connected to the ground via the third capacitor C3.

6. The air conditioner outdoor unit control circuit according to claim 4, characterized in that: The voltage follower comprises a second operational amplifier U2 and a fourth capacitor C4; the positive phase input terminal of the second operational amplifier U2 is connected to the energy storage unit, the negative phase input terminal of the second operational amplifier U2 is connected to the output terminal of the second operational amplifier U2, the output terminal of the second operational amplifier U2 is also connected to the control unit (4), and the output terminal of the second operational amplifier U2 is connected to the ground via the fourth capacitor C4.

7. The air conditioner outdoor unit control circuit according to claim 1, characterized in that: The temperature measurement unit (1) comprises a first resistor R1, a second resistor R2 and a thermistor CT1; the first ends of the first resistor R1 and the second resistor R2 are connected to a DC voltage, the second ends of the first resistor R1 and the second resistor R2 are connected to ground via the thermistor CT1, and the connection node between the second resistor R2 and the thermistor CT1 is connected to the input end of the bidirectional switch unit (2).

8. The air conditioner outdoor unit control circuit according to any one of claims 1 to 7, characterized in that: The air conditioner outdoor unit control circuit also includes: A signal amplifying unit (5) is connected between the temperature measuring unit (1) and the bidirectional switch unit (2) and is used to amplify the ambient temperature signal output by the temperature measuring unit (1) and input the amplified ambient temperature signal to an input end of the bidirectional switch unit (2).

9. The air conditioner outdoor unit control circuit according to claim 8, characterized in that: The signal amplifying unit (5) comprises a first operational amplifier U1, a fourth resistor R4, a fifth resistor R5, and a second capacitor C2; a positive phase input terminal of the first operational amplifier U1 is connected to the temperature measuring unit (1); a negative phase input terminal of the first operational amplifier U1 is connected to the ground via the fourth resistor R4 in one path and to the output terminal of the first operational amplifier U1 via the fifth resistor R5 in another path; and an output terminal of the first operational amplifier U1 is connected to the input terminal of the bidirectional switch unit (2) and is connected to the ground via the second capacitor C2.

10. An air conditioner, characterized in that: It comprises the air conditioner outdoor unit control circuit as described in any one of claims 1 to 9.

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