CN115371239A - Four-way valve control circuit and its control method and air conditioner - Google Patents

Abstract

The invention discloses a four-way valve control circuit, a control method thereof and an air conditioner, wherein the four-way valve control circuit comprises: the operational amplifier unit is used for collecting alternating voltage sampling signals; the control unit is connected with the output end of the operational amplifier unit and used for determining a zero crossing point moment according to the alternating voltage sampling signal and sending a switch control signal according to the zero crossing point moment; and the output end of the switch unit is suitable for being connected with a power grid and an electromagnetic coil of the four-way valve, and the input end of the switch unit is connected with the control unit and used for executing switching action according to the switching control signal so as to control the conduction direction of the four-way valve. The control circuit can meet the working requirements under different input alternating voltages, improves the universality of the circuit, and has simple circuit structure and easy realization.

Description

Four-way valve control circuit and its control method and air conditioner

technical field

The invention relates to the technical field of air conditioners, in particular to a four-way valve control circuit, a control method thereof and an air conditioner.

Background technique

The four-way valve is usually used to switch the refrigerant flow direction of the refrigeration system. For example, the four-way valve is used to make the refrigerant flow from the outdoor heat exchanger to the indoor heat exchanger during cooling, and the four-way valve is used to switch the flow direction during heating to make the refrigerant flow from the indoor heat exchanger. Flow to the outdoor heat exchanger, so as to realize the cooling and heating functions of the air conditioner.

In the related art, the control circuit of the bistable four-way valve includes a rectifier bridge, a power relay, a reversing relay, a current limiting resistor and related control circuits that drive the aforementioned two groups of relays, which converts alternating current into direct current through the rectifier bridge, and passes The reversing relay changes the current direction through the core iron, and the power relay acts as a master switch to control the current on and off of the core iron. However, there are many electrical components in the control circuit and the connection structure is complicated, occupying a large PCB area and high cost. .

In addition, the current value that the four-way valve coil can withstand should be within a reasonable range. The coil resistance is the same, but the current generated by different voltage inputs will be different. If it continues to work with a large current value for a long time, the coil will be damaged, and If the current value is too small, the coil cannot convert enough electromagnetic force to act. However, the existing four-way valve control circuit cannot distinguish the input voltage. When encountering different input voltages such as 110V and 220V, in order to ensure the safety of the coil and ensure the normal operation of the solenoid valve, it is necessary to design different four-way valve coils and current-limiting resistors. Circuit versatility is poor.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to propose a four-way valve control circuit, which can meet the working requirements under different input AC voltages, improve the versatility of the circuit, and the circuit structure is simple and easy to implement.

The second object of the present invention is to provide a control method for a four-way valve control circuit.

The third object of the present invention is to provide an air conditioner.

In order to solve the above problems, the embodiment of the first aspect of the present invention provides a four-way valve control circuit, including: an operational amplifier unit, the input end of the operational amplifier unit is suitable for connecting to the power grid, and is used to collect AC voltage sampling signals; the control unit , the control unit is connected to the output terminal of the operational amplifier unit, and is used to determine the zero-crossing time according to the AC voltage sampling signal and send a switch control signal according to the zero-crossing time; the switching unit, the output of the switching unit The end is suitable for connecting the power grid and the electromagnetic coil of the four-way valve, and the input end of the switch unit is connected to the control unit for performing switching actions according to the switch control signal to control the conduction of the four-way valve Direction: a power supply unit, the power supply unit is suitable for connecting to the power grid, and is used for supplying power to the control unit and the operational amplifier unit.

According to the four-way valve control circuit of the embodiment of the present invention, the operational amplifier unit is used to collect the AC voltage sampling signal, and the control unit identifies the zero-crossing time and the effective value of the voltage to output the switch control signal, and the four-way valve is controlled by the switch unit as a switch The direction of the current in the electromagnetic coil can be controlled to control the conduction direction of the four-way valve, without the need to set up a rectifier bridge, power relay, reversing relay and related control circuits, etc., reducing the use of electrical components, and the circuit structure is simple ,Easy to implement.

In some embodiments, the operational amplifier unit includes: a first resistor, the first end of which is suitable for connecting to the live wire of the grid; an operational amplifier, the positive input end of which is connected to the first terminal of the operational amplifier. The second end of a resistor is connected, the power input end of the operational amplifier is connected to the power supply unit, the output end of the operational amplifier is connected to the control unit, and the ground terminal of the operational amplifier is grounded; the second resistor, The first terminal of the second resistor is connected to the output terminal of the operational amplifier; the third resistor, the first terminal of the third resistor is connected to the negative input terminal of the operational amplifier, the second terminal of the second resistor terminal connection, and the second terminal of the third resistor is adapted to be connected to the neutral line of the power grid.

In some embodiments, the switch unit includes: a solid state relay, the first end of the solid state relay is connected to the control unit, the second end of the solid state relay is grounded, and the third end of the solid state relay is suitable for The live wire of the power grid is connected, and the fourth terminal of the solid state relay is connected with the electromagnetic coil of the four-way valve.

In some embodiments, it also includes: an energy storage unit, the energy storage unit is connected in parallel with the electromagnetic coil of the four-way valve, and the first end of the energy storage unit is connected with the output end of the switch unit; A current limiting unit, the first terminal of the current limiting unit is connected to the neutral line of the grid, and the second terminal of the current limiting unit is connected to the second terminal of the energy storage unit.

In some embodiments, the control unit is further configured to determine a voltage effective value according to the AC voltage sampling signal, determine a target conduction time according to the voltage effective value, and control the four The conduction time of the through valve.

The embodiment of the second aspect of the present invention provides a control method of a four-way valve control circuit, which is used to control the four-way valve control circuit described in the above embodiment. The control method includes: acquiring an AC voltage sampling signal; The zero-crossing time is determined by the voltage sampling signal; a switch control signal is sent according to the zero-crossing time to control the conduction direction of the four-way valve.

According to the control method of the four-way valve control circuit of the embodiment of the present invention, the AC voltage sampling signal is used to identify the zero-crossing moment to output the switch control signal, and the switch unit is used as a switch to control the current direction in the electromagnetic coil of the four-way valve, that is The control of the conduction direction of the four-way valve can be realized without setting a rectifier bridge, a power relay, a reversing relay and related control circuits, etc., reducing the use of electrical components, and the circuit structure is simple and easy to implement.

In some embodiments, the four-way valve control circuit is used in an air conditioner. Sending a switch control signal according to the zero-crossing time to control the conduction direction of the four-way valve includes: obtaining the target operation mode of the air conditioner; The target operation mode and the zero-crossing moment send switch control signals to control the conduction direction of the four-way valve.

In some embodiments, the switch control signal includes a turn-on control signal and a turn-off control signal, and the switch control signal is sent according to the target operation mode and the zero-crossing moment to control the turn-on direction of the four-way valve, including :

Determining that the target operation mode is cooling mode; sending a conduction control signal when the zero-crossing time is the positive half-cycle zero-crossing time, so that the conduction direction of the four-way valve is forward conduction; at the zero-crossing point When the time is the zero crossing time of the negative half cycle, the shutdown control signal is sent;

Alternatively, it is determined that the target operation mode is the heating mode; when the zero-crossing time is the negative half-cycle zero-crossing time, a conduction control signal is sent, so that the conduction direction of the four-way valve is reverse conduction; The above-mentioned zero-crossing time is when the zero-crossing time of the positive half cycle is sent to shut down the control signal.

In some embodiments, before sending the switch control signal according to the target operation mode and the zero-crossing time to control the conduction direction of the four-way valve, it also includes: obtaining the last operation mode of the air conditioner; When the target operation mode is consistent with the last operation mode, the control on the four-way valve is stopped, so that the four-way valve maintains the current conduction direction.

In some embodiments, the control method further includes: determining a voltage effective value according to the AC voltage sampling signal; determining a target conduction duration according to the voltage effective value; controlling the four-way valve according to the target conduction duration of conduction time.

The embodiment of the third aspect of the present invention provides an air conditioner, including: including a refrigerant circulation circuit, so that the refrigerant circulates in the circuit composed of a compressor, a condenser, an expansion valve, an evaporator, and a four-way valve; the four-way valve, The four-way valve includes an electromagnetic coil; the four-way valve control circuit described in the above embodiment, the four-way valve control circuit is connected to the electromagnetic coil; at least one processor; A memory; wherein, the memory stores a computer program that can be executed by at least one of the processors, and at least one of the processors executes the computer program to implement the control method of the four-way valve control circuit described in the above embodiment .

According to the air conditioner of the embodiment of the present invention, the processor executes the control method of the four-way valve control circuit provided in the above embodiment, and can dynamically adjust the conduction time of the four-way valve according to different AC voltages input by the power grid to meet different input requirements. The working requirement under AC voltage improves the versatility of the circuit.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the schematic diagram of four-way valve control circuit in the prior art;

2 is a schematic diagram of a four-way valve control circuit according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of a four-way valve according to an embodiment of the present invention when it is engaged;

Fig. 4 is a schematic diagram of signals when controlling the forward conduction of the four-way valve according to an embodiment of the present invention;

5 is a schematic diagram of a four-way valve control circuit according to another embodiment of the present invention;

Fig. 6 is a schematic diagram of the release of the four-way valve according to an embodiment of the present invention;

Fig. 7 is a schematic diagram of signals when controlling the reverse conduction of the four-way valve according to an embodiment of the present invention;

Fig. 8 is a schematic structural view of an air conditioner according to an embodiment of the present invention;

9 is a flowchart of a control method of a four-way valve control circuit according to an embodiment of the present invention;

10 is a flowchart of a control method of a four-way valve control circuit according to another embodiment of the present invention;

11 is a flowchart of a control method of a four-way valve control circuit according to another embodiment of the present invention;

Fig. 12 is a schematic structural view of an air conditioner according to another embodiment of the present invention.

Reference signs:

Four-way valve control circuit 10; air conditioner 20;

operational amplifier unit 1; control unit 2; switch unit 3; power supply unit 4; energy storage unit 5; current limiting unit 6;

Four-way valve 7; memory 8; processor 9.

Detailed ways

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary, and embodiments of the present invention are described in detail below.

In the related art, for the control circuit of the four-way valve, as shown in FIG. 1 , one end of the relay K11 is connected to the live line L of the power supply, the other end is connected to the rectifier bridge V11 , and the neutral line N of the power supply is connected to the rectifier bridge V11 . Relay K12 is a two-group switching relay, its contact 4 is connected to the common cathode output of the rectifier bridge V11, the contact 7 is connected to the common anode output of the rectifier bridge V11, the contact 3 is connected to the current limiting resistor R11, and the contact 5 is connected to the limiting resistor R11. The current limiting resistor R11 and R12 are respectively connected to the two ends of the four-way valve coil L11, and the contacts 6 and 8 are respectively connected to the two ends of the four-way valve coil L11; the relays K11 and K12 are respectively controlled by the chip signal control. The control chip controls the relay K11 through the triode V12. When the control chip outputs a low level, the contact of the relay K11 is disconnected. When the control chip outputs a high level, the contact of the relay K11 is closed; the control chip controls the relay K12 through the triode V13. When the control chip gives a low-level control signal, the contact 4 of the relay K12 is connected to the contact 3, and the contact 7 is connected to the contact 6. When the control chip gives a high-level control signal, the contact of the relay K12 Point 4 is connected to contact 5, and contact 7 is connected to contact 8. However, the above-mentioned control circuit has many electrical components and a complicated connection structure, occupies a large area of the PCB, and has a high cost. In addition, it is impossible to distinguish the input voltage of the power grid. When encountering different input voltages such as 110V and 220V, in order to ensure To ensure the safety of the coil and ensure the normal operation of the solenoid valve, it is necessary to design different four-way valve coils and current limiting resistors, and the circuit versatility is poor.

In order to solve the above problems, the following describes the four-way valve control circuit provided by the embodiment of the present invention with reference to FIG. 1. The control circuit can meet the working requirements under different input AC voltages, improve the versatility of the circuit, and the circuit structure is simple and easy to implement. .

As shown in FIG. 2 , the four-way valve control circuit 10 provided by the embodiment of the present invention includes an operational amplifier unit 1 , a control unit 2 , a switch unit 3 and a power supply unit 4 .

Among them, the input terminal of the operational amplifier unit 1 is suitable for connecting to the power grid for collecting AC voltage sampling signals; the control unit 2 is connected with the output terminal of the operational amplifier unit 1 for determining the zero-crossing time according to the AC voltage sampling signal, and according to the The switch control signal is sent at zero time; the output end of the switch unit 3 is suitable for connecting the power grid and the electromagnetic coil of the four-way valve, and the input end of the switch unit 3 is connected to the control unit for performing switching actions according to the switch control signal to control the four-way valve conduction direction; the power supply unit 4 is suitable for connecting to the power grid, and is used to supply power for the control unit 2 and the operational amplifier unit 1 .

In the embodiment, the four-way valve is mainly used in heat pump air conditioners. There are mainly four pipes connected in structure, and its function is to change the indoor heat exchange in the air conditioner by changing the flow direction of the refrigerant in the air conditioning system. The functions of the outdoor heat exchanger and the outdoor heat exchanger realize the switching of cooling, heating or defrosting modes.

As shown in FIG. 3 , the four-way valve mainly includes an electromagnetic coil M, a pilot valve 12 and a main valve 13 . Wherein, the electromagnetic coil M includes a coil part 14 and a permanent magnet 15, and the pilot valve 12 includes a valve core 16 and a return spring 17. By changing the direction of the current passing through the coil part 14, the attraction and disengagement of the valve core 16 and the permanent magnet 15 are controlled. At the same time, the return spring 17 is used to ensure the positioning of the valve core 16 after it breaks away from the permanent magnet 15 . Specifically, for the four-way valve, due to the application of the permanent magnet 15, there is a polarized magnetic flux generated by the permanent magnet in the solenoid valve body. When the working magnetic flux is generated in the coil part 14 due to the input current signal, the working magnetic flux Superimposed with the polarized magnetic flux to enhance the suction, it will overcome the resistance of the return spring 17 and attract the valve core 16, thereby changing the position of the valve, making the four-way valve conduct forward, and even if the input current signal is cut off at this time , under the action of the permanent magnet 15, the spool 16 will remain in the suction position. Obviously, if the signal current is turned on in the original direction at this time, it will not have any effect on the spool 16 . And if the spool 16 is released, the direction of the current in the coil part 14 must be changed, thus the working magnetic flux and the polarized magnetic flux are offset, the suction force is reduced, and the spool 16 returns to the original position under the elastic force of the return spring 17 , making the four-way valve reverse conduction.

And, the four-way valve has the characteristics of high sensitivity, high stability and short action time. Its shortest working time, that is, the pulse width is only about 50ms. Therefore, the power consumption is extremely low. In addition, since the electromagnetic coil of the four-way valve does not need to work in a long-term energized state, it does not need to consume electric energy for a long time when the air conditioner is working.

For the operational amplifier unit 1, it is an amplifying circuit structure with a special coupling circuit and feedback, and its output signal is the result of mathematical operations such as addition, subtraction, or differentiation and integration of the input signal; for the switch unit 3, when working, If a certain control signal is added to its input end, the switch state of the output end can be controlled.

Based on the working principle of the above-mentioned four-way valve, operational amplifier unit 1 and switch unit 3, as shown in FIG. N is connected to output the voltage required by the back-end load, such as 5V, to supply power for the operational amplifier unit 1 and the control unit 2 . And, the input end of op-amp unit 1 is also connected to live line L, zero line N of power grid, and the output end of op-amp unit 1 is connected with control unit 2, so as to output AC voltage sampling signal to control unit 2; Control unit 2 according to The AC voltage sampling signal is used to calculate the zero-crossing moment of the AC voltage input by the power grid; the input end of the switch unit 3 is connected to the control unit 2, and its output end is not only connected to the live line L of the power grid, but also to the electromagnetic coil M of the four-way valve. One end is connected, and the other end of the electromagnetic coil M of the four-way valve is connected to the neutral line N of the power grid, so that a working circuit can be formed between the live line L, the output end of the switch unit 3, the electromagnetic coil M and the neutral line N . Therefore, based on the above-mentioned connection method, when the control unit 2 outputs a high-level signal such as 5V, the input end of the switch unit 3 is turned on, thereby controlling the turn-on of the output end of the switch unit 3, thereby closing the above-mentioned working loop; When the unit 2 outputs a low-level signal such as 0V, the input terminal of the switch unit 3 is cut off, thereby controlling the output terminal of the switch unit 3 to be disconnected, thereby disconnecting the above-mentioned working loop.

Exemplarily, the four-way valve control circuit 10 is applied to an air conditioner. When the air conditioner starts to work, the AC voltage input from the power grid passes through the operational amplifier unit 1 to detect the zero-crossing point of the AC voltage and obtain the input to the control unit 2. The AC voltage sampling signal, that is, the AC voltage sampling signal includes the information of the zero-crossing moment. Among them, the zero-crossing moment when the AC voltage changes from negative to positive can be called the zero-crossing moment of the positive half cycle, and the zero-crossing point when the AC voltage changes from positive to negative is called It is the zero-crossing time of the negative half cycle. Furthermore, the control unit 2 waits to judge the control command of the four-way valve to determine whether the valve core needs to be engaged or released. For example, when the user controls the air conditioner to perform cooling mode, the valve core needs to be controlled to engage. When the heater is in heating mode, it is necessary to control the release of the spool.

When the control unit 2 determines to control the spool pull-in of the four-way valve, after the control unit 2 detects the AC voltage sampling signal provided by the op-amp unit 1, it controls the input end of the switch unit 3 to conduct with the zero-crossing time of the positive half cycle as the reference. and turn off the switch unit 3 at the zero-crossing point of the negative half cycle, so that the control unit 2 only sends the positive polarity pulse of the positive half cycle of the AC voltage sine wave to the electromagnetic coil M of the four-way valve through the switch unit 3, so that the four-way The pulsating direct current of positive polarity obtained in the electromagnetic coil M of the valve impels the spool 16 of the four-way valve to move towards the closing direction. For example, as shown in Figure 2, the current direction in the electromagnetic coil after obtaining positive pulsating direct current in the electromagnetic coil M of the four-way valve; displacement, so that port a of the four-way valve communicates with port b, and port c communicates with port d; at the same time, as shown in Figure 4, the spool 16 of the four-way valve is attracted to the permanent magnet 14 in the positive half cycle of the AC voltage sampling signal , thereby achieving the purpose of controlling the conduction direction of the four-way valve to be forward conduction.

In addition, the control unit 2 is also used to determine the effective value of the voltage according to the AC voltage sampling signal, determine the target conduction time according to the effective value of the voltage, and control the conduction time of the four-way valve according to the target conduction time.

Specifically, the AC voltage sampling signal provided by the operational amplifier unit 1 also includes information on the effective value of the voltage, and the control unit 2 controls the input terminal of the switch unit 3 in the positive half cycle according to the difference in the effective value of the voltage detected by the operational amplifier unit 1. The conduction time of forward conduction at zero time is preset, as shown in Table 1, to ensure that the electromagnetic coil M can convert enough electromagnetic force without damage, so that the spool of the four-way valve can move in place. It can be understood that, when the other conditions of the electromagnetic coil M of the four-way valve remain unchanged, the higher the applied voltage of the electromagnetic coil M, the higher the current flowing through the electromagnetic coil M, and therefore the greater the electromagnetic force, thus It can quickly drive the spool of the four-way valve to move in place, so the required conduction time is shorter, and at the same time, the shorter the conduction time, the total power consumption of the electromagnetic coil M of the four-way valve can also be reduced, ensuring that the four-way valve The safety of the electromagnetic coil M. For example, as shown in Table 1, the higher the effective value of the voltage, the shorter the conduction time of the four-way valve. When the effective value of the voltage is 220V, the corresponding target conduction time is 2.5S, and when the effective value of the voltage is 110V , the corresponding target conduction duration is 6S. After the above-mentioned target conduction time is reached, the control action of the four-way valve control circuit 10 is completed, and the four-way valve is under the action of the permanent magnet 15, and the spool 16 will still remain in the pull-in position, so the switch unit 3 remains in the cut-off state , no longer supplies power to solenoid M of the four-way valve.

It should be noted that for voltages not listed in Table 1, linear interpolation can be performed with reference to the voltages listed in Table 1.

Table 1

RMS voltage A On time A＞275V 1.5S 220V＜A≤275V 2S 191V＜A≤220V 2.5S 164V＜A≤191V 3S 137V＜A≤164V 3.5S 110V＜A≤137V 4S A≤110V 6S

When the control unit 2 determines to control the release of the spool of the four-way valve, the control unit 2 controls the conduction of the input terminal of the switch unit 3 based on the zero-crossing time of the negative half cycle after detecting the AC voltage sampling signal provided by the operational amplifier unit 1. , and turn off the switch unit 3 when the positive half cycle crosses zero, thus, the control unit 2 only sends the negative polarity pulse of the negative half cycle of the AC voltage sine wave to the electromagnetic coil M of the four-way valve through the switch unit 2, so that the four-way valve The pulsating direct current of negative polarity obtained in the electromagnetic coil M of the four-way valve prompts the spool 16 of the four-way valve to move toward the release direction. For example, as shown in Figure 5, it is the current direction in the electromagnetic coil after the pulsating direct current of negative polarity is obtained in the electromagnetic coil M of the four-way valve; displacement, so that port a of the four-way valve communicates with port d, and port c communicates with port b; at the same time, as shown in Figure 7, the spool 16 of the four-way valve is released in the negative half cycle of the AC voltage sampling signal, thereby realizing control The conduction direction of the four-way valve is for the purpose of reverse conduction.

At the same time, similar to the principle of positive conduction, negative conduction also needs to pass a certain conduction time before stopping the power supply to the electromagnetic coil M of the four-way valve, so as to ensure that the spool of the four-way valve can move in place and determine the negative conduction. The target conduction period is the same as the above-mentioned period required for the forward conduction, and will not be repeated here. After the above-mentioned target conduction time, the control action of the four-way valve control circuit 10 is completed, and the valve core 16 of the four-way valve will remain in the release position under the action of the return spring 17. Therefore, the switch unit 3 remains in the cut-off state, no need Then supply power to the electromagnetic coil M of the four-way valve.

Thus, the present application uses the operational amplifier unit 1 to judge the forward phase and reverse phase of the AC voltage input by the power grid, and sends the judgment result as an AC voltage sampling signal to the control unit 2, so that the electromagnetic coil M of the four-way valve When forward conduction is required, the control unit 2 controls the switch unit 3 to conduct at the positive phase of the AC voltage sampling signal, that is, at the moment when the positive half-cycle zero crosses, so that the four-way valve conducts in the forward direction, and in the negative phase of the AC voltage sampling signal. When the phase is negative, that is, when the negative half cycle is zero, it is not conducting; and, when the electromagnetic coil M of the four-way valve needs reverse conduction, the control unit 2 controls the switch unit 3 in the negative phase of the AC voltage sampling signal, that is, the negative half cycle passes It is turned on at the zero moment, so that the four-way valve is reversed, and it is not turned on at the positive phase of the AC voltage sampling signal, that is, the zero moment of the positive half cycle. Therefore, there is no need to install a rectifier bridge, a power relay, a reversing relay, and related control circuits, etc., reducing the use of electrical components, and the circuit structure is simple and easy to implement. In addition, this application also uses the AC voltage sampling signal collected by the operational amplifier unit 1 to calculate the effective value of the voltage, and determines the target conduction time according to the effective value of the voltage, so as to control the conduction time of the four-way valve, that is, it can be input according to the power grid. Different AC voltages can be used to dynamically adjust the conduction time of the four-way valve to meet the working requirements under different input AC voltages, thereby further ensuring the safety of the four-way valve and the normal operation of the four-way valve, and ensuring the performance of the four-way valve.

According to the four-way valve control circuit 10 of the embodiment of the present invention, the operational amplifier unit 1 is used to collect the AC voltage sampling signal, and the control unit 2 identifies the zero-crossing time and the effective value of the voltage to output the switch control signal, and the switch unit 3 is used as a switch to By controlling the current direction in the electromagnetic coil of the four-way valve, the conduction direction of the four-way valve can be controlled, without the need to install a rectifier bridge, power relay, reversing relay and related control circuits, etc., reducing the use of electrical components , the circuit structure is simple and easy to implement, and the control unit 2 also uses the effective value of the voltage to determine the target conduction time, that is to say, the four-way valve control circuit 10 can use the effective value of the voltage to distinguish the AC voltage input by the power grid, thereby providing To ensure the normal operation of the four-way valve, the conduction time of the four-way valve can be dynamically adjusted according to the different AC voltages input by the power grid, so as to meet the working requirements under different input AC voltages and improve the versatility of the circuit.

In some embodiments, as shown in FIG. 2 or 5 , the operational amplifier unit 1 includes a first resistor R1 , an operational amplifier N1 , a second resistor R2 and a third resistor R3 .

Wherein, the first end of the first resistor R1 is suitable for connecting to the fire wire L of the power grid; the positive input end of the operational amplifier N1 is connected with the second end of the first resistor R1, and the power input end of the operational amplifier N1 is connected with the power supply unit 4, and the operation The output terminal of the amplifier N1 is connected to the control unit 2, the ground terminal of the operational amplifier N1 is grounded; the first terminal of the second resistor R2 is connected to the output terminal of the operational amplifier N1; the first terminal of the third resistor R3 is connected to the negative terminal of the operational amplifier N1 The input end is connected to the second end of the second resistor R2, and the second end of the third resistor R3 is adapted to be connected to the neutral line N of the grid. Therefore, when controlling the four-way valve, the AC voltage input from the power grid enters the positive input terminal of the operational amplifier N1 from the live wire L through the first resistor R1 for step-down and current limiting, and the AC voltage input from the grid passes through the third resistor from the neutral wire N R3 enters the negative input terminal of the operational amplifier N1 after stepping down and limiting the current. The second resistor R2 is connected between the negative input terminal and the output terminal of the operational amplifier N1, and is used to determine the operational amplifier together with the first resistor R1 and the third resistor R3. The amplification or reduction ratio of N1 realizes the acquisition of the AC voltage sampling signal.

Specifically, assuming that the AC voltage between the live wire L and the neutral wire N of the power grid is Vac, and the AC voltage sampling signal output by the operational amplifier N1 is Vad, then Vad=Vac(R2/R3). In an embodiment, R1=R2 can be designed.

In some embodiments, as shown in Fig. 2 or 5, the switch unit 3 includes a solid state relay B1.

For example, referring to Figure 2 or 5, the solid state relay B1 adopts an optocoupler relay, the first end of the optocoupler relay B1 is connected to the control unit 2, the second end of the optocoupler relay B1 is grounded, and the third end of the optocoupler relay B1 is suitable for Connect to the live wire L of the grid, and the fourth end of the optocoupler relay B1 is connected to the electromagnetic coil M of the four-way valve. Thus, when the control unit 2 outputs a high-level signal, the light-emitting diode of the optocoupler relay B1 is turned on, thereby controlling the conduction of the load end of the optocoupler relay B1, and then the live wire L, the load end of the optocoupler relay B1, and the electromagnetic The working loop formed by the coil M and the neutral line N is closed; when the control unit 2 outputs a low-level signal, the light-emitting diode of the optocoupler relay B1 is turned off, thereby controlling the disconnection of the load end of the optocoupler relay B1, thereby making the above working loop disconnected. Open, so as to realize the control of the current direction in the electromagnetic coil M of the four-way valve by using the switch unit 3 as a switch, and realize the control of the conduction direction of the four-way valve.

Specifically, as shown in Fig. 2, when the control unit 2 is controlling the spool pull-in of the four-way valve, the control unit 2 controls the zero-crossing time of the positive half cycle based on the AC voltage sampling signal provided by the operational amplifier N1. The light-emitting diode of the optocoupler relay B1 is turned on, that is, the anode A of the light-emitting diode of the optocoupler relay B1 sends a high-level signal such as 5V, because the anode A of the light-emitting diode gets a voltage of 5V, and the cathode K is connected to the reference ground voltage of 0V, so it emits light A voltage drop occurs at both ends of the diode and a current flows; and the optocoupler relay B1 is turned off at the zero crossing point of the negative half cycle, that is, the signal output by the control unit 2 to the anode A of the light-emitting diode of the optocoupler relay B1 is low level 0V.

And, as shown in FIG. 5, when the control unit 2 is controlling the release of the spool of the four-way valve, the control unit 2 controls the optocoupler based on the zero-crossing time of the negative half cycle after detecting the AC voltage sampling signal provided by the operational amplifier N1. The light-emitting diode of relay B1 is turned on, that is, a high-level signal is sent to the anode A of the light-emitting diode of the optocoupler relay B1. Because the anode A of the light-emitting diode gets a voltage of 5V, and the cathode K is connected to the reference ground voltage of 0V, so the two ends of the light-emitting diode generate The voltage drops and a current flows; and the optocoupler relay B1 is turned off at the moment of zero crossing in the positive half cycle, that is, the signal output by the control unit 2 to the anode A of the light-emitting diode of the optocoupler relay B1 is low level 0V. Thus, through the above process, the switch unit 3 is used as a switch to control the direction of the current in the electromagnetic coil M of the four-way valve, so as to realize the control of the conduction direction of the four-way valve.

In some embodiments, as shown in FIG. 2 or 5 , the four-way valve control circuit 10 further includes an energy storage unit 5 and a current limiting unit 6 .

Wherein, the energy storage unit 5 is connected in parallel with the electromagnetic coil M of the four-way valve, and the first end of the energy storage unit 5 is connected with the output end of the switch unit 3; the first end of the current limiting unit 6 is connected with the neutral line N of the grid , the second end of the current limiting unit 6 is connected to the second end of the energy storage unit 5 .

Specifically, as shown in Figure 4 or Figure 7, since the electromagnetic coil M of the four-way valve only has current passing in one half cycle of the AC voltage, and no current passes in the other half cycle, it may cause a four-way The spool of the valve is shaken and unstable when it moves. In order to solve this problem, the application also sets an energy storage unit 5 in the four-way valve control circuit 10, such as the capacitor C1 shown in Figure 2 or Figure 5, the energy storage unit 5 is connected in parallel with the electromagnetic coil M of the four-way valve, and stores The energy unit 5 can play the role of energy storage and smoothing filter. That is to say, the energy storage unit 5 performs energy storage and charging when the positive pulse direct current or the negative pulse direct current is turned on. The unit 5 starts to discharge to supply power to the electromagnetic coil M of the four-way valve, and after the load end of the switch unit 3 is turned off, the energy storage unit 5 can continue to discharge to supply power to the electromagnetic coil M of the four-way valve, thus In the other half cycle of the alternating current, the electromagnetic coil M of the four-way valve can still maintain a positive or negative current, thereby ensuring a smoother and more stable switching process.

In addition, as shown in FIG. 2 or FIG. 5, when the output terminal of the switch unit 3 is turned on, the working loop formed by the live line L, the output terminal of the switch unit 3, the electromagnetic coil M and the neutral line N, but considering the The resistance value is small. In order to avoid the problem of damage to the electromagnetic coil caused by the excessive input current of the power grid, this application adds a current limiting unit 6 between the electromagnetic coil M and the neutral line N, such as the resistor shown in Figure 2 or Figure 5 R7 thus plays the role of current limiting protection for the electromagnetic coil M.

The embodiment of the second aspect of the present invention provides an air conditioner. As shown in FIG. 8 , the air conditioner 20 includes a four-way valve 7 and a four-way valve control circuit 10 .

The air conditioner performs functions such as cooling/heating cycle or dehumidification through the compressor, condenser, expansion valve and evaporator, which can realize the adjustment of the indoor environment and improve the comfort of the indoor environment. A refrigeration cycle includes a series of processes such as those involving compression, condensation, expansion, and evaporation, and supplies refrigerant to air that has been conditioned and heat-exchanged.

The compressor compresses refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve, and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can realize the cooling effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. Throughout the cycle, the air conditioner can condition the environment of the interior space.

Refrigerant circulation circuit, which makes the refrigerant circulate in the circuit composed of compressor, condenser, expansion valve, evaporator and four-way valve.

In the embodiment, the four-way valve 7 includes an electromagnetic coil; the four-way valve control circuit 10 is connected with the electromagnetic coil.

According to the air conditioner 20 of the embodiment of the present invention, the four-way valve control circuit 10 provided by the above embodiment can meet the working requirements under different input AC voltages, improve the versatility of the circuit, and the circuit structure is simple and easy to implement.

The embodiment of the third aspect of the present invention provides a control method of a four-way valve control circuit. The control method is used to control the four-way valve control circuit provided in the above embodiment. As shown in FIG. 9, the control method includes at least steps S1- Step S3.

Step S1, acquiring an AC voltage sampling signal.

In the embodiment, as shown in FIG. 2 , the AC voltage output by the power grid enters the operational amplifier unit 1 through the live wire L and the neutral wire N, and after being amplified or reduced by the operational amplifier unit 1, the AC voltage sampling signal is output to be sent to the control unit. 2.

Step S2, determining the zero-crossing time according to the AC voltage sampling signal.

Step S3, sending a switch control signal according to the zero-crossing time to control the conduction direction of the four-way valve.

In the embodiment, as shown in FIG. 2 or FIG. 3 , controlling the switch unit 3 to be turned on or off at different zero-crossing moments can effectively change the direction of the current in the electromagnetic coil M, and the different directions of the current will prompt the four-way valve to switch on or off. The direction of conduction is different, so the operational amplifier unit 1 is used to collect the AC voltage sampling signal, and the control unit 2 identifies the zero-crossing time and the effective value of the voltage to output the switch control signal, and the switch unit 3 is used as a switch to control the four-way valve. The current direction in the electromagnetic coil, so that when the four-way valve is forward-conducting, the control unit can identify the zero-crossing moment to control the switch unit 3 to conduct, so as to allow the positive phase current in the electromagnetic coil to pass, so that the four-way valve is forward On the contrary, when the four-way valve is conducting in the positive direction, the control unit can identify the zero-crossing moment to control the switch unit 3 to conduct, so as to allow the current of the negative phase in the electromagnetic coil to pass through, so that The four-way valve conducts in the reverse direction, while the forward phase is cut off. Therefore, the control unit 2 can realize the control of the conduction direction of the four-way valve by identifying the zero-crossing moment. The circuit structure is simple and the control method is easy to implement.

According to the control method of the four-way valve control circuit of the embodiment of the present invention, the AC voltage sampling signal is used to identify the zero-crossing moment to output the switch control signal, and the switch unit is used as a switch to control the current direction in the electromagnetic coil of the four-way valve, that is The control of the conduction direction of the four-way valve can be realized without setting a rectifier bridge, a power relay, a reversing relay and related control circuits, etc., reducing the use of electrical components, and the circuit structure is simple and easy to implement.

In some embodiments, the above-mentioned four-way valve control circuit is used in an air conditioner. When controlling the four-way valve, the present application judges whether the control action on the four-way valve is a pull-in action or a closing action by obtaining the target operating mode of the air conditioner. It is a release action, and then send a switch control signal according to the target operation mode and the zero-crossing time to control the conduction direction of the four-way valve, so as to realize the control of the flow direction of the refrigerant in the air conditioner, and realize the cooling mode, heating mode or defrosting mode function switching.

Wherein, the target operation mode can be understood as the mode to be operated after the air conditioner starts to work this time.

In some embodiments, the control method of the present application further includes determining the voltage effective value according to the AC voltage sampling signal; determining the target conduction duration according to the voltage effective value; and controlling the conduction duration of the four-way valve according to the target conduction duration.

Specifically, when the other conditions of the electromagnetic coil of the four-way valve remain unchanged, the higher the applied voltage of the electromagnetic coil, the higher the current flowing through the electromagnetic coil, and the greater the electromagnetic force, so that the four-way valve can be quickly driven The spool of the valve moves in place, so the required conduction time is shorter, so based on the above principle, the corresponding conduction time can be set in advance according to different voltage effective values, as shown in Table 1. Therefore, in order to ensure the safety and normal operation of the electromagnetic coil, the conduction period of the four-way valve is controlled by the target conduction period determined by the effective value of the voltage, that is, the effective value of the voltage is used to distinguish the AC voltage input by the grid, so that the four-way The one-way valve completes the pull-in or release action within the target conduction time to ensure the performance of the four-way valve, and can dynamically adjust the conduction time of the four-way valve according to the different AC voltages input by the power grid to meet the needs of different input AC voltages. Work requirements, improve the versatility of the circuit.

In some embodiments, the switch control signal includes a turn-on control signal and a turn-off control signal.

If it is determined that the target operation mode is the cooling mode, it means that the control action on the four-way valve is a pull-in action, and then the following steps are performed.

The first conduction step is to send a conduction control signal when the zero-crossing time is the positive half-cycle zero-crossing time, so that the conduction direction of the four-way valve is positive conduction; the first shut-off step is a negative half-cycle at the zero-crossing time Send a shut-off control signal at the time of zero crossing; repeat the first conduction step and the first shut-off step until the conduction time of the four-way valve reaches the target conduction time, it means that the spool of the four-way valve has moved in place, That is, under the action of the permanent magnet of the four-way valve, the spool will remain in the suction position, so the switch unit remains in the cut-off state, and there is no need to supply power to the electromagnetic coil of the four-way valve.

Alternatively, if it is determined that the target operation mode is the heating mode, it means that the control action on the four-way valve is a release action, and then the following steps are performed.

In the second conduction step, the conduction control signal is sent at the zero-crossing time of the negative half-cycle, so that the conduction direction of the four-way valve is reverse conduction; the second shut-off step is the positive half-cycle at the zero-crossing time Send a shut-off control signal at the moment of zero crossing; repeat the second conduction step and the second shut-off step until the conduction time of the four-way valve reaches the target conduction time, it means that the spool of the four-way valve has moved in place, That is, under the action of the return spring of the four-way valve, the spool will still remain at the release position, so the switch unit remains in the cut-off state, and there is no need to supply power to the electromagnetic coil of the four-way valve.

The control process of the four-way valve will be illustrated below with reference to FIG. 10 , and the specific steps are as follows.

Step S5, determining the voltage effective value according to the AC voltage sampling signal.

Step S6, determining the zero-crossing time according to the AC voltage sampling signal.

Step S7, determining the target conduction time according to the effective value of the voltage.

Step S8, determining the target operating mode of the air conditioner.

Step S9, judging whether to control the four-way valve to engage or release according to the target operation mode. If the four-way valve is controlled to engage, then step S10 is performed; if the four-way valve is controlled to be released, then step S11 is performed.

Step S10, turning on the solid state relay at the time of zero crossing in the positive half cycle; turning off the solid state relay at the time of zero crossing in the negative half cycle.

Step S11, turning on the solid state relay at the time of zero crossing in the negative half cycle; turning off the solid state relay at the time of zero crossing in the positive half cycle.

Step S12, judging whether the target conduction time is reached. If yes, execute step S13; if not, execute step S10 or step S11.

In step S13, the control action of the electromagnetic coil of a four-way valve is completed, and the solid state relay is turned off.

In some embodiments, before sending the switch control signal according to the target operation mode and the zero-crossing time to control the conduction direction of the four-way valve, the control method further includes obtaining the last operation mode of the air conditioner; Stop the control of the four-way valve when the last operating mode is consistent, so that the four-way valve maintains the current conduction direction, so that there is no need to control the conduction direction and conduction time of the four-way valve, saving energy consumption.

Wherein, the last operation mode is the operation mode when the air conditioner was started to work last time.

Specifically, in order to further save the energy consumption of the four-way valve, in the above control method, the present application judges the last operation mode and the currently designated operation mode, that is, the target operation mode, so as to determine the difference between the target operation mode and the last operation mode. At the same time, the spool that can control the four-way valve does not need to move, so that the four-way valve maintains the current conduction direction. On the contrary, when the target operation mode is different from the previous operation mode, the spool that controls the four-way valve needs to move. , so that the four-way valve switches the conduction direction.

For example, if the last operating mode of the air conditioner was the cooling mode, and the target operating mode this time is also the cooling mode, then it can be judged that the spool of the four-way valve does not need to move; and if the target operating mode this time is heating mode, it is judged that the spool of the four-way valve needs to move. Among them, when the spool of the four-way valve does not need to move, the input end of the control unit to the switch unit is low level, the input end is cut off, and the output end of the switch unit, that is, the load end, is disconnected, so that the electromagnetic of the four-way valve There is no current flowing in the coil, the electromagnetic coil does not work, and the spool of the four-way valve remains in its original state; when the spool of the four-way valve needs to move, it is judged according to the target operation mode whether the four-way valve needs to be engaged or released. And then execute subsequent control actions.

In an embodiment, the defrosting mode of the air conditioner can be considered as the heating mode.

The control process of the four-way valve will be illustrated below with reference to FIG. 11 , and the specific steps are as follows.

Step S14, determining the voltage effective value according to the AC voltage sampling signal.

Step S15, determining the zero-crossing time according to the AC voltage sampling signal.

Step S16, determining the target conduction time according to the effective value of the voltage.

Step S17, judging whether the target operation mode of the air conditioner is consistent with the last operation mode, so as to determine whether the four-way valve needs to be activated. If they are consistent, execute step S14; if not, execute step S18.

Step S18, obtaining the target operating mode of the air conditioner.

Step S19, judging whether to control the four-way valve to engage or release according to the target operation mode. If the four-way valve is controlled to engage, then step S20 is performed; if the four-way valve is controlled to be released, then step S21 is performed.

Step S20, turning on the solid state relay at the zero crossing time of the positive half cycle; turning off the solid state relay at the zero crossing time of the negative half cycle.

Step S21, turning on the solid state relay at the time of zero crossing in the negative half cycle; turning off the solid state relay at the time of zero crossing in the positive half cycle.

Step S22, judging whether the target conduction time is reached. If yes, execute step S13; if not, execute step S20 or step S21.

In step S23, the control action of the electromagnetic coil of a four-way valve is completed, and the solid state relay is turned off.

The embodiment of the fourth aspect of the present invention provides an air conditioner. As shown in FIG. 12 , the air conditioner 20 includes at least one processor 9 and a memory 8 communicatively connected with the at least one processor 9 .

Wherein, the memory 8 stores a computer program that can be executed by at least one processor 9, and at least one processor 9 executes the computer program to implement the control method of the four-way valve control circuit provided by the above embodiment.

According to the air conditioner 20 of the embodiment of the present invention, the processor 8 executes the control method of the four-way valve control circuit provided in the above-mentioned embodiment, and can dynamically adjust the conduction duration of the four-way valve according to different AC voltages input by the grid to meet The working requirements under different input AC voltages improve the versatility of the circuit.

In the description of this specification, any process or method description in a flow diagram or otherwise described herein may be understood as representing a program comprising one or more steps of executable instructions for implementing a custom logic function or process modules, segments or portions of code, and the scope of the preferred embodiments of the invention includes further implementations, which may not be in the order shown or discussed, including substantially concurrently or in reverse order depending on the functions involved , to perform functions, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

The logic and/or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium, For use with instruction execution systems, devices, or devices (such as computer-based systems, systems including processors, or other systems that can fetch instructions from instruction execution systems, devices, or devices and execute instructions), or in conjunction with these instruction execution systems, devices or equipment used. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use in or in conjunction with an instruction execution system, device or device. More specific examples (non-exhaustive list) of computer-readable media include the following: electrical connection with one or more wires (electronic device), portable computer disk case (magnetic device), random access memory (RAM), Read Only Memory (ROM), Erasable and Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, since the program can be read, for example, by optically scanning the paper or other medium, followed by editing, interpretation or other suitable processing if necessary. The program is processed electronically and stored in computer memory.

It should be understood that various parts of the present invention can be realized by hardware, software, firmware or their combination. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented by any one or a combination of the following techniques known in the art: a discrete Logic circuits, ASICs with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. During execution, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. A four-way valve control circuit, characterized in that, comprising: An operational amplifier unit, the input terminal of the operational amplifier unit is suitable for connecting to the power grid for collecting AC voltage sampling signals; A control unit, the control unit is connected to the output terminal of the operational amplifier unit, and is used to determine the zero-crossing time according to the AC voltage sampling signal, and send a switch control signal according to the zero-crossing time; A switch unit, the output end of the switch unit is suitable for connecting the power grid and the electromagnetic coil of the four-way valve, the input end of the switch unit is connected to the control unit, and is used to perform switching actions according to the switch control signal, so as to controlling the conduction direction of the four-way valve; A power supply unit, the power supply unit is adapted to be connected to a power grid, and is used for supplying power to the control unit and the operational amplifier unit. 2. The four-way valve control circuit according to claim 1, characterized in that, The operational amplifier unit includes: a first resistor, the first end of the first resistor is adapted to be connected to the live wire of the power grid; An operational amplifier, the positive input terminal of the operational amplifier is connected to the second end of the first resistor, the power input terminal of the operational amplifier is connected to the power supply unit, and the output terminal of the operational amplifier is connected to the control unit connected, the ground terminal of the operational amplifier is grounded; a second resistor, the first end of the second resistor is connected to the output end of the operational amplifier; A third resistor, the first end of the third resistor is connected to the negative input end of the operational amplifier and the second end of the second resistor, and the second end of the third resistor is suitable for connecting to the power grid zero line; The switch unit includes: A solid state relay, the first end of the solid state relay is connected to the control unit, the second end of the solid state relay is grounded, the third end of the solid state relay is suitable for connecting the live wire of the grid, and the solid state relay The fourth end is connected with the electromagnetic coil of the four-way valve. 3. The four-way valve control circuit according to claim 1 or 2, further comprising: an energy storage unit, the energy storage unit is connected in parallel with the electromagnetic coil of the four-way valve, and the first end of the energy storage unit is connected to the output end of the switch unit; A current limiting unit, the first terminal of the current limiting unit is connected to the neutral line of the grid, and the second terminal of the current limiting unit is connected to the second terminal of the energy storage unit. 4. The four-way valve control circuit according to claim 3, wherein the control unit is further configured to determine a voltage effective value according to the AC voltage sampling signal, and determine a target conduction according to the voltage effective value The duration is to control the conduction duration of the four-way valve according to the target conduction duration. 5. A control method for a four-way valve control circuit, characterized in that it is used to control the four-way valve control circuit according to any one of claims 1-4, the control method comprising: Obtain AC voltage sampling signal; determining the zero-crossing moment according to the AC voltage sampling signal; A switch control signal is sent according to the zero-crossing time to control the conduction direction of the four-way valve. 6. The control method of the four-way valve control circuit according to claim 5, characterized in that the four-way valve control circuit is used in an air conditioner, and a switch control signal is sent according to the zero-crossing time to control the four-way valve conduction direction, including: Obtain the target operating mode of the air conditioner; A switch control signal is sent according to the target operation mode and the zero-crossing time to control the conduction direction of the four-way valve. 7. The control method of the four-way valve control circuit according to claim 6, characterized in that, the switch control signal includes a conduction control signal and a close control signal, according to the target operation mode and the zero-crossing time Send a switch control signal to control the conduction direction of the four-way valve, including: determining that the target operation mode is a cooling mode; Sending a conduction control signal when the zero-crossing moment is the positive half-cycle zero-crossing moment, so that the conduction direction of the four-way valve is forward conduction; Sending a shutdown control signal when the zero-crossing moment is a negative half-cycle zero-crossing moment; Or, determine that the target operation mode is a heating mode; Sending a conduction control signal when the zero-crossing moment is the negative half-cycle zero-crossing moment, so that the conduction direction of the four-way valve is reverse conduction; The shutdown control signal is sent when the zero-crossing time is the zero-crossing time of the positive half cycle. 8. The control method of the four-way valve control circuit according to claim 6, characterized in that before sending a switch control signal according to the target operating mode and the zero-crossing time to control the conduction direction of the four-way valve ,Also includes: Obtain the last operating mode of the air conditioner; When the target operation mode is consistent with the last operation mode, the control on the four-way valve is stopped, so that the four-way valve maintains the current conduction direction. 9. The control method of the four-way valve control circuit according to any one of claims 5-8, wherein the control method further comprises: determining an effective voltage value according to the AC voltage sampling signal; determining the target conduction time according to the effective value of the voltage; The conduction period of the four-way valve is controlled according to the target conduction period. 10. An air conditioner, characterized in that it comprises: Refrigerant circulation circuit, which makes the refrigerant circulate in the circuit composed of compressor, condenser, expansion valve, evaporator and four-way valve; the four-way valve includes a solenoid; and The four-way valve control circuit according to any one of claims 1-5, wherein the four-way valve control circuit is connected to the electromagnetic coil; and, at least one processor; a memory communicatively coupled to at least one of said processors; Wherein, the memory stores a computer program that can be executed by at least one of the processors, and at least one of the processors executes the computer program to implement the four-way valve control circuit according to any one of claims 6-9 control method.

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