Control circuit, circuit board of magnetic latching relay and air conditioner

Abstract

The application discloses a control circuit of a magnetic latching relay, a circuit board and an air conditioner. The control circuit of the magnetic latching relay comprises a magnetic latching relay, a control module and an abnormality detection module. The magnetic latching relay comprises a coil connection end. The output end of the control module is connected to the coil connection end. The input end of the abnormality detection module is connected to the coil connection end. The output end of the abnormality detection module is connected to the input end of the control module. In response to a voltage signal generated by the coil connection end when the magnetic latching relay is abnormally reset, the abnormality detection module outputs an abnormal disconnection signal to the control module. According to the technical scheme of the embodiment of the application, the abnormal disconnection of the magnetic latching relay can be detected and the abnormal disconnection signal can be output, so that the reliability of the circuit is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioner circuit, and particularly relates to a control circuit of a magnetic latching relay, a circuit board and an air conditioner. BACKGROUND

[0002] The magnetic latching relay can realize power-off after relay control, and the relay can continue to maintain the state after control. However, if the magnetic latching relay is abnormally disconnected during use, the power supply of the circuit will be disconnected, which causes the circuit to be unable to work. For example, if the outdoor unit of an air conditioner is controlled by the magnetic latching relay to supply power, and the outdoor unit is suddenly abnormally reset during operation, the outdoor unit will be disconnected and unable to work, thereby reducing the reliability of the circuit. SUMMARY

[0003] The present application aims to at least solve one of the problems in the prior art, and provides a control circuit of a magnetic latching relay, a circuit board and an air conditioner, which can detect abnormal disconnection of the magnetic latching relay and output an abnormal disconnection signal, thereby improving the reliability of the circuit.

[0004] In a first aspect, an embodiment of the present application provides a control circuit of a magnetic latching relay, comprising a magnetic latching relay, a control module and an abnormality detection module, wherein:

[0005] The magnetic latching relay comprises a coil connection end;

[0006] The output end of the control module is connected to the coil connection end;

[0007] The input end of the abnormality detection module is connected to the coil connection end, and the output end of the abnormality detection module is connected to the input end of the control module; in response to a voltage signal generated by the coil connection end when the magnetic latching relay is abnormally reset, the abnormality detection module outputs an abnormal disconnection signal to the control module.

[0008] The control circuit of the magnetic latching relay provided by the embodiment of the present application has at least the following beneficial effects: when the magnetic latching relay needs to be switched, the output end of the control module outputs a control signal to the coil connection end, so that the magnetic latching relay is switched to a reset state or a set state; the input end of the abnormality detection module is connected to the coil connection end, which can continuously detect the voltage of the coil connection end; when the magnetic latching relay is abnormally reset, the coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay, so that the coil connection end generates a voltage signal, and the abnormality detection module outputs an abnormal disconnection signal to the control module in response to the voltage signal, so that the control module can control the magnetic latching relay to be re-closed according to the abnormal disconnection signal, thereby improving the reliability of the circuit.

[0009] In the control circuit of the magnetic latching relay, the abnormality detection module comprises a detection amplification module and a comparison module; the detection amplification module comprises a first operational amplifier for amplifying the voltage signal generated at the coil connection end, and the input end of the first operational amplifier is connected to the coil connection end; the comparison module comprises a second operational amplifier, the output end of the first operational amplifier is connected to the non-inverting input end of the second operational amplifier, the inverting input end of the second operational amplifier is connected to a reference voltage, and the output end of the second operational amplifier is connected to the input end of the control module.

[0010] In the embodiment, the detection amplification module is arranged to detect and amplify the voltage signal generated at the coil connection end. When the magnetic latching relay is abnormally reset, the coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay, so that the coil connection end generates a voltage signal output. After the detection amplification module detects the voltage signal, the voltage signal is amplified by the first operational amplifier and transmitted to the second operational amplifier. The second operational amplifier compares the output voltage of the first operational amplifier with the reference voltage. When the output voltage of the first operational amplifier is greater than the reference voltage, the second operational amplifier outputs an abnormal disconnection signal and transmits it to the control module. The control module can output a control signal to the coil connection end again according to the abnormal disconnection signal received by the input end, so as to control the magnetic latching relay to be closed again. In this way, the magnetic latching relay can be restored to a normal operating state when it is abnormally operated.

[0011] In the control circuit of the magnetic latching relay, the detection amplification module further comprises a first resistor, a second resistor, a third resistor and a fourth resistor. One end of the coil connection end is connected to the inverting input end of the first operational amplifier through the first resistor, the other end of the coil connection end is connected to the non-inverting input end of the first operational amplifier through the second resistor, the non-inverting input end of the first operational amplifier is grounded through the third resistor, and the inverting input end of the first operational amplifier is connected to the output end of the first operational amplifier through the fourth resistor.

[0012] In the embodiment, the first operational amplifier is a differential operational amplifier. By arranging the first resistor, the second resistor, the third resistor, the fourth resistor and the first operational amplifier, the voltage signal generated at the coil connection end can be differentially sampled and amplified, so that the gain effect is high.

[0013] In the control circuit of the magnetic latching relay, the detection amplification module further comprises a first capacitor connected in parallel with the third resistor and a second capacitor connected in parallel with the fourth resistor.

[0014] In the embodiment, the first capacitor is connected in parallel with the third resistor, and the second capacitor is connected in parallel with the fourth resistor. By arranging the first capacitor and the second capacitor, high-frequency interference signals can be filtered out, the accuracy of the voltage detection signal is ensured, the control module is prevented from malfunctioning, the control circuit of the magnetic latching relay has good anti-interference ability, and the working reliability of the control circuit is enhanced.

[0015] In the control circuit of the magnetic latching relay, the abnormality detection module further comprises a first filter module, the first filter module comprises a fifth resistor and a third capacitor, one end of the fifth resistor is connected to the output end of the first operational amplifier, the other end of the fifth resistor is connected to one end of the third capacitor and the non-inverting input end of the second operational amplifier, and the other end of the third capacitor is grounded.

[0016] In the embodiment, by arranging the first filter module, high-frequency interference signals can be filtered out, the second operational amplifier can accurately detect the voltage signal, the reliability of the abnormal opening signal output by the second operational amplifier is ensured, the control module is prevented from malfunctioning, the anti-interference ability of the control circuit of the magnetic latching relay is enhanced, and the working reliability of the control circuit is improved.

[0017] In the control circuit of the magnetic latching relay, the comparison module further comprises a sixth resistor, a seventh resistor and a fourth capacitor, one end of the sixth resistor is connected to the first DC power supply end, the other end of the sixth resistor is connected to the inverting input end of the second operational amplifier, one end of the seventh resistor and one end of the fourth capacitor, the other end of the seventh resistor and the other end of the fourth capacitor are grounded.

[0018] In the embodiment, the sixth resistor and the seventh resistor are both voltage dividing resistors, the DC voltage of the first DC power supply end is divided by the sixth resistor and the seventh resistor to output a reference voltage to the inverting input end of the second operational amplifier, voltage detection is simple and convenient, meanwhile, the output voltage of the first operational amplifier is transmitted to the non-inverting input end of the second operational amplifier, the second operational amplifier can compare the size of the output voltage of the first operational amplifier and the reference voltage, when the magnetic latching relay is abnormally reset, the output voltage of the first operational amplifier is greater than the reference voltage, the second operational amplifier outputs an abnormal opening signal and transmits the abnormal opening signal to the control module, the control module can control the magnetic latching relay to be re-closed according to the abnormal opening signal, the reliability of the circuit is improved, by arranging the fourth capacitor, the fourth capacitor is connected in parallel with the seventh resistor, high-frequency interference signals can be filtered out, and the accuracy of the signal input to the second operational amplifier is ensured.

[0019] In the control circuit of the magnetic latching relay, the abnormality detection module further comprises a second filter module, the second filter module comprises an eighth resistor and a fifth capacitor, an output end of the second operational amplifier is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to one end of the fifth capacitor and an input end of the control module, and the other end of the fifth capacitor is grounded.

[0020] In the embodiment, the second filter module is arranged, the high-frequency interference signal can be filtered out, the control module can accurately detect the abnormal opening signal, the control module can be prevented from malfunctioning, the anti-interference capability of the control circuit of the magnetic latching relay is enhanced, and the working reliability of the control circuit is improved.

[0021] In the control circuit of the magnetic latching relay, the magnetic latching relay is a double-coil magnetic latching relay, the coil connection end comprises a common pin, a reset pin and a set pin, the control module comprises a second DC power supply end, a first switch tube and a second switch tube, the common pin is connected to the second DC power supply end and a noninverting input end of the first operational amplifier, the reset pin is connected to one switch pin of the first switch tube, the set pin is connected to one switch pin of the second switch tube and a noninverting input end of the first operational amplifier, and the other switch pin of the first switch tube and the other switch pin of the second switch tube are grounded.

[0022] In the embodiment, the magnetic latching relay is a double-coil magnetic latching relay, when the first switch tube is turned on, the voltage of the second DC power supply end can be loaded on the reset coil of the magnetic latching relay, so that the magnetic latching relay is reset, and when the second switch tube is turned on, the voltage of the second DC power supply end can be loaded on the closing coil of the magnetic latching relay, so that the magnetic latching relay is closed.

[0023] In the control circuit of the magnetic latching relay, the control circuit further comprises a first diode and a second diode, the reset pin is connected to a positive electrode of the first diode, the set pin is connected to a positive electrode of the second diode, and negative electrodes of the first diode and the second diode are connected to the second DC power supply end.

[0024] In the embodiment, by setting the first diode, connecting the positive pole of the first diode to the reset pin of the magnetic latching relay, a freewheeling circuit can be provided for the reset coil of the magnetic latching relay, preventing the current of the reset coil from impacting the first switch tube after the first switch tube is suddenly turned off, and the first switch tube can be protected, by setting the second diode, connecting the positive pole of the second diode to the set pin of the magnetic latching relay, a freewheeling circuit can be provided for the closing coil of the magnetic latching relay, preventing the current of the closing coil from impacting the second switch tube after the second switch tube is suddenly turned off, and the second switch tube can be protected, and the stability and reliability of the control circuit of the magnetic latching relay can be improved.

[0025] In the control circuit of the magnetic latching relay, the magnetic latching relay is a single-coil magnetic latching relay, the control module includes a second DC power supply end, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube, the second DC power supply end is connected to one switch pin of the third switch tube and one switch pin of the fourth switch tube respectively, one switch pin of the fifth switch tube and one switch pin of the sixth switch tube are grounded, the other switch pin of the third switch tube and the other switch pin of the fifth switch tube are connected to one end of the coil connection end, and the other switch pin of the fourth switch tube and the other switch pin of the sixth switch tube are connected to the other end of the coil connection end.

[0026] In the embodiment, the magnetic latching relay is a single-coil magnetic latching relay, which is closed when a forward current is passed through, and is disconnected when a reverse current is passed through. The other switch pin of the third switch tube and the other switch pin of the fifth switch tube are also connected to the inverting input end of the first operational amplifier, and the other switch pin of the fourth switch tube and the other switch pin of the sixth switch tube are also connected to the non-inverting input end of the first operational amplifier. It can be understood that the two ends of the coil connection end are connected to the inverting input end and the non-inverting input end of the first operational amplifier respectively, and the coil of the single-coil magnetic latching relay can be detected.

[0027] In a second aspect, the embodiment of the present application provides a circuit board comprising the control circuit according to the first aspect.

[0028] According to the circuit board provided by the embodiment of the present application, at least the following beneficial effects are achieved: when the magnetic latching relay needs to switch states, the output end of the control module outputs a control signal to the coil connection end, so that the magnetic latching relay switches to a reset state or a set state; the input end of the abnormality detection module is connected to the coil connection end, and the voltage of the coil connection end can be continuously detected; when the magnetic latching relay abnormally resets, the coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay, so that a voltage signal is generated at the coil connection end, and the abnormality detection module outputs an abnormal opening signal to the control module in response to the voltage signal, so that the control module can control the magnetic latching relay to re-close according to the abnormal opening signal, thereby improving the reliability of the circuit.

[0029] In a third aspect, the embodiment of the present application provides an air conditioner, which comprises the control circuit according to the first aspect or the circuit board according to the second aspect.

[0030] According to the air conditioner provided by the embodiment of the present application, at least the following beneficial effects are achieved: when the magnetic latching relay needs to switch states, the output end of the control module outputs a control signal to the coil connection end, so that the magnetic latching relay switches to a reset state or a set state; the input end of the abnormality detection module is connected to the coil connection end, and the voltage of the coil connection end can be continuously detected; when the magnetic latching relay abnormally resets, the coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay, so that a voltage signal is generated at the coil connection end, and the abnormality detection module outputs an abnormal opening signal to the control module in response to the voltage signal, so that the control module can control the magnetic latching relay to re-close according to the abnormal opening signal, thereby improving the reliability of the circuit.

[0031] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by means of the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0033] The present application will be further described below with reference to the accompanying drawings and embodiments;

[0034] Figure 1 FIG. 1 is a structural schematic diagram of a control circuit of a magnetic latching relay provided by an embodiment of the present application;

[0035] Figure 2is a structural schematic diagram of a control circuit of a magnetic latching relay provided in Embodiment Two of the present application;

[0036] Figure 3 is a structural schematic diagram of a control circuit of a magnetic latching relay provided in Embodiment Three of the present application. DETAILED DESCRIPTION

[0037] This part will describe the specific embodiments of the present application in detail, and the preferred embodiments of the present application are shown in the accompanying drawings, which serve to supplement the description in the text part of the specification and enable people to intuitively and visually understand each technical feature and the overall technical scheme of the present application, but cannot be understood as a limitation on the protection scope of the present application.

[0038] In the description of the embodiments of the present application, one or more is meant to be one or more, more than two is meant to be two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number, "at least one" means one or more, "at least one of the following" and the like means any combination of these items, including any combination of single or multiple items. If there is a description of "first", "second", etc., it is only used to distinguish technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0039] It should be noted that the terms such as setting, installing and connecting in the embodiments of the present application should be understood broadly, and the skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of the present application in combination with the specific content of the technical scheme. For example, the term "connection" can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium.

[0040] It should be noted that the technical features involved in each embodiment of the present application described below can be combined with each other as long as there is no conflict between them.

[0041] The magnetic latching relay is a new type of relay developed in recent years, which is also an automatic switch. Like other electromagnetic relays, it plays a role in automatically connecting and cutting off the circuit, but the difference is that the normally closed or normally open state of the magnetic latching relay completely depends on the action of a permanent magnet, and the switching state of the magnetic latching relay is triggered by a pulse electrical signal of a certain width to complete the switching.

[0042] In the related art, the magnetic latching relay can be used to realize the power-off after the relay control, and the relay can continue to maintain the state after the control. However, if the magnetic latching relay is abnormally disconnected during use, the circuit power supply will be disconnected, causing the circuit to fail to work. For example, if the outdoor unit of an air conditioner is controlled by a magnetic latching relay, and the outdoor unit is suddenly abnormally reset during operation, the outdoor unit will be disconnected and unable to work, thereby reducing the reliability of the circuit.

[0043] Based on the above, the embodiment of the present application provides a control circuit of a magnetic latching relay, a circuit board and an air conditioner. The control circuit of the magnetic latching relay comprises a magnetic latching relay, a control module and an abnormality detection module. The magnetic latching relay comprises a coil connection end. The output end of the control module is connected to the coil connection end. The input end of the abnormality detection module is connected to the coil connection end, and the output end of the abnormality detection module is connected to the input end of the control module. In response to the voltage signal generated by the coil connection end when the magnetic latching relay is abnormally reset, the abnormality detection module outputs an abnormal disconnection signal to the control module. According to the technical solution of the embodiment of the present application, when the magnetic latching relay needs to switch states, the output end of the control module outputs a control signal to the coil connection end, so that the magnetic latching relay switches to a reset state or a set state. The input end of the abnormality detection module is connected to the coil connection end, which can continuously detect the voltage of the coil connection end. When the magnetic latching relay is abnormally reset, the coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay, so that the coil connection end generates a voltage signal. The abnormality detection module outputs an abnormal disconnection signal to the control module in response to the voltage signal, so that the control module can control the magnetic latching relay to re-close according to the abnormal disconnection signal, which is beneficial to improve the reliability of the circuit.

[0044] The embodiment of the present application will be further described below with reference to the accompanying drawings.

[0045] As Figure 1 shown, the first aspect embodiment of the present application provides a control circuit of a magnetic latching relay, comprising a magnetic latching relay K1, a control module 200 and an abnormality detection module 300. The magnetic latching relay K1 comprises a coil connection end 100. The output end of the control module 200 is connected to the coil connection end 100. The input end of the abnormality detection module 300 is connected to the coil connection end 100, and the output end of the abnormality detection module 300 is connected to the input end of the control module 200. In response to the voltage signal generated by the coil connection end 100 when the magnetic latching relay K1 is abnormally reset, the abnormality detection module 300 outputs an abnormal disconnection signal to the control module 200.

[0046] It should be noted that by connecting the output end of the control module 200 to the coil connection end 100, the control module 200 outputs a control signal to the coil connection end 100 when controlling the magnetic latching relay K1 to switch states, so that the magnetic latching relay K1 can be switched to different states, and the state of the magnetic latching relay K1 can include a reset state and a set state. The reset state can be understood as the magnetic latching relay K1 being in a contact open state, and the set state can be understood as the magnetic latching relay K1 being in a contact closed state.

[0047] The control circuit of the magnetic latching relay provided by the above-mentioned first aspect embodiment, when the magnetic latching relay K1 needs to switch states, the output end of the control module 200 outputs a control signal to the coil connection end 100, so that the magnetic latching relay K1 switches to a reset state or a set state; the input end of the abnormality detection module 300 is connected to the coil connection end 100, which can continuously detect the voltage of the coil connection end 100; when the magnetic latching relay K1 abnormally resets, the coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay K1, causing the coil connection end 100 to generate a voltage signal, and the abnormality detection module 300 outputs an abnormal disconnection signal to the control module 200 in response to the voltage signal, so that the control module 200 can control the magnetic latching relay K1 to re-close according to the abnormal disconnection signal, which is beneficial to improve the reliability of the circuit.

[0048] It can be understood that for the case that the magnetic latching relay K1 abnormally disconnects during use, causing the circuit power supply to disconnect, the control circuit of the magnetic latching relay of the embodiment of the application sets the abnormality detection module 300, connects the abnormality detection module 300 between the coil connection end 100 of the magnetic latching relay K1 and the input end of the control module 200, and can detect the state of the magnetic latching relay K1 in real time during normal operation of the circuit. If the magnetic latching relay K1 is abnormally reset due to external force during use, i.e. switches from a set state to a reset state, the coil connection end 100 will output a voltage signal, and the abnormality detection module 300 will output an abnormal disconnection signal after detecting the voltage signal, so that the control module 200 can control the magnetic latching relay K1 to return to the set state, i.e. return to the normal operating state. The control circuit of the embodiment of the application can detect the abnormal disconnection of the magnetic latching relay K1 and output an abnormal disconnection signal, thereby solving the problem of abnormal disconnection of the magnetic latching relay K1 during use, causing the circuit power supply to disconnect, so that the load can work normally, and the working reliability of the circuit is improved.

[0049] As Figures 1 to 3As shown in the control circuit of the above magnetic latching relay, the abnormality detection module 300 comprises a detection amplification module 310 and a comparison module 320; the detection amplification module 310 comprises a first operational amplifier IC4A for amplifying the voltage signal generated by the coil connection end 100, and the input end of the first operational amplifier IC4A is connected to the coil connection end 100; the comparison module 320 comprises a second operational amplifier IC4B, the output end of the first operational amplifier IC4A is connected to the non-inverting input end of the second operational amplifier IC4B, the inverting input end of the second operational amplifier IC4B is connected to a reference voltage, and the output end of the second operational amplifier IC4B is connected to the input end of the control module 200.

[0050] In the embodiment, the detection amplification module 310 is arranged to detect and amplify the voltage signal generated by the coil connection end 100. When the magnetic latching relay K1 is abnormally reset, the coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay K1, so that the coil connection end 100 generates a voltage signal output. After the detection amplification module 310 detects the voltage signal, the voltage signal is amplified by the first operational amplifier IC4A and transmitted to the second operational amplifier IC4B. The second operational amplifier IC4B compares the output voltage of the first operational amplifier IC4A with the reference voltage. When the output voltage of the first operational amplifier IC4A is greater than the reference voltage, the second operational amplifier IC4B outputs an abnormal disconnection signal and transmits it to the control module 200. The control module 200 can output a control signal to the coil connection end 100 according to the abnormal disconnection signal received by the input end, so as to control the magnetic latching relay K1 to be re-closed. Thus, the magnetic latching relay K1 can be restored to the normal operating state when it is abnormally operated. It can be understood that the output end of the second operational amplifier IC4B serves as the output end of the abnormality detection module 300, and outputs the abnormal disconnection signal to the control module 200.

[0051] The voltage signal generated by the coil connection end 100 is sampled in real time, and the voltage signal is amplified by the first operational amplifier IC4A and then transmitted to the second operational amplifier IC4B for comparison, so as to ensure the reliability of voltage detection.

[0052] In an embodiment, the abnormal disconnection signal is a high-level signal. When the output voltage of the first operational amplifier IC4A is greater than the reference voltage, the second operational amplifier IC4B outputs a high-level signal to the control module 200. After the control module 200 receives the high-level signal, the control module 200 can control the magnetic latching relay K1 to be quickly closed again, so as to avoid the influence of the disconnection of the magnetic latching relay K1 on the normal operation of the circuit.

[0053] As Figures 1 to 3As shown in the control circuit of the above magnetic latching relay, the detection amplification module 310 further comprises a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, one end of the coil connection end 100 is connected to the inverting input end of the first operational amplifier IC4A through the first resistor R1, the other end of the coil connection end 100 is connected to the non-inverting input end of the first operational amplifier IC4A through the second resistor R2, the non-inverting input end of the first operational amplifier IC4A is grounded through the third resistor R3, and the inverting input end of the first operational amplifier IC4A is connected to the output end of the first operational amplifier IC4A through the fourth resistor R4.

[0054] In the embodiment, the first operational amplifier IC4A is a differential operational amplifier, and by setting the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the first operational amplifier IC4A, the voltage signal generated by the coil connection end 100 can be differentially sampled and amplified, and the first operational amplifier IC4A has a high gain effect.

[0055] In an embodiment, the resistance value of the first resistor R1 is equal to the resistance value of the second resistor R2, and the resistance value of the third resistor R3 is equal to the resistance value of the fourth resistor R4, and at this time, the amplification multiple of the first operational amplifier IC4A can be obtained according to the following formula:

[0056] A=R1 / R4;

[0057] Wherein, A is the amplification multiple of the first operational amplifier, R1 is the first resistor, and R4 is the fourth resistor.

[0058] It should be noted that the magnetic latching relay K1 of the above embodiment can be a double-coil magnetic latching relay or a single-coil magnetic latching relay. When the magnetic latching relay K1 is a double-coil magnetic latching relay, one end and the other end of the coil connection end 100 refer to the two ends of the closed coil. It can be understood that by connecting the two ends of the closed coil to the inverting input end of the first operational amplifier IC4A through the first resistor R1 and to the non-inverting input end of the first operational amplifier IC4A through the second resistor R2, the closed coil of the double-coil magnetic latching relay can be detected. When the magnetic latching relay K1 abnormally resets, the closed coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay K1, thereby generating a voltage signal at the two ends of the closed coil, i.e., generating a voltage signal at the coil connection end 100. The first operational amplifier IC4A amplifies and transmits the voltage signal to the second operational amplifier IC4B. The second operational amplifier IC4B compares the signal and outputs an abnormal disconnection signal to the control module 200, so that the control module 200 can re-control the closed coil to act to restore to the set state. When the magnetic latching relay K1 is a single-coil magnetic latching relay, one end and the other end of the coil connection end 100 refer to the two ends of the single coil. Similarly, by connecting the two ends of the single coil to the inverting input end of the first operational amplifier IC4A through the first resistor R1 and to the non-inverting input end of the first operational amplifier IC4A through the second resistor R2, the coil of the single-coil magnetic latching relay can be detected.

[0059] As shown in Figure 2 and Figure 3 In the control circuit of the above magnetic latching relay, the detection amplification module 310 further includes a first capacitor C1 connected in parallel with the third resistor R3 and a second capacitor C2 connected in parallel with the fourth resistor R4.

[0060] In this embodiment, the first capacitor C1 is connected in parallel with the third resistor R3, and the second capacitor C2 is connected in parallel with the fourth resistor R4. By setting the first capacitor C1 and the second capacitor C2, high-frequency interference signals can be filtered out, the accuracy of the voltage detection signal is ensured, the false action of the control module 200 is avoided, the control circuit of the magnetic latching relay has good anti-interference ability, and the working reliability of the control circuit is enhanced.

[0061] As shown in Figure 2 and Figure 3 In the control circuit of the above magnetic latching relay, the abnormality detection module 300 further includes a first filter module 330. The first filter module 330 includes a fifth resistor R5 and a third capacitor C3. The output end of the first operational amplifier IC4A is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to one end of the third capacitor C3 and the non-inverting input end of the second operational amplifier IC4B. The other end of the third capacitor C3 is grounded.

[0062] In this embodiment, by setting the first filtering module 330, high-frequency interference signals can be filtered out, enabling the second operational amplifier IC4B to accurately detect voltage signals, ensuring the reliability of the abnormal disconnection signal output by the second operational amplifier IC4B, avoiding malfunction of the control module 200, enhancing the anti-interference capability of the control circuit of the magnetic latching relay, and improving the working reliability of the control circuit.

[0063] It should be noted that, since the control circuit of the magnetic latching relay may be affected by other components during operation, interference signals can easily couple to the line between the output terminal of the first operational amplifier IC4A and the non-inverting input terminal of the second operational amplifier IC4B. By setting the first filter module 330, the influence of interference signals can be greatly reduced, ensuring the accuracy of the detection signal input to the second operational amplifier IC4B.

[0064] like Figure 2 and Figure 3 As shown, in the control circuit of the magnetic latching relay, the comparison module 320 further includes a sixth resistor R6, a seventh resistor R7, and a fourth capacitor C4. One end of the sixth resistor R6 is connected to the first DC power supply terminal 400, and the other end of the sixth resistor R6 is connected to the inverting input terminal of the second operational amplifier IC4B, one end of the seventh resistor R7, and one end of the fourth capacitor C4. The other ends of the seventh resistor R7 and the other ends of the fourth capacitor C4 are grounded.

[0065] It should be noted that the control circuit of the magnetic latching relay also includes a first DC power supply terminal 400, which is used to provide DC voltage. The sixth resistor R6 and the seventh resistor R7 are connected in series, and the connection point of the sixth resistor R6 and the seventh resistor R7 is connected to the inverting input terminal of the second operational amplifier IC4B.

[0066] In this embodiment, both the sixth resistor R6 and the seventh resistor R7 are voltage divider resistors. The DC voltage at the first DC power supply terminal 400 is divided by the sixth resistor R6 and the seventh resistor R7 to output a reference voltage to the inverting input terminal of the second operational amplifier IC4B. Voltage detection is simple and convenient. At the same time, the output voltage of the first operational amplifier IC4A is transmitted to the non-inverting input terminal of the second operational amplifier IC4B. The second operational amplifier IC4B can compare the output voltage of the first operational amplifier IC4A with the reference voltage. When the magnetic latching relay K1 is abnormally reset, the output voltage of the first operational amplifier IC4A is greater than the reference voltage. The second operational amplifier IC4B outputs an abnormal disconnection signal and transmits it to the control module 200. The control module 200 can control the magnetic latching relay K1 to reclose according to the abnormal disconnection signal, which helps to improve the reliability of the circuit. By setting the fourth capacitor C4, which is connected in parallel with the seventh resistor R7, it can filter out high-frequency interference signals, which helps to ensure the accuracy of the signal input to the second operational amplifier IC4B.

[0067] In an embodiment, the abnormal disconnection signal is a high level signal, in the case that the magnetic latching relay K1 is abnormally reset, the output voltage of the first operational amplifier IC4A is transmitted to the non-inverting input terminal of the second operational amplifier IC4B through the fifth resistor R5, the direct current voltage of the first direct current power supply end 400 is divided by the sixth resistor R6 and the seventh resistor R7 to obtain a reference voltage and is transmitted to the inverting input terminal of the second operational amplifier IC4B, when the output voltage of the first operational amplifier IC4A is greater than the reference voltage, the second operational amplifier IC4B outputs a high level signal to the control module 200, after the control module 200 receives the high level signal, the magnetic latching relay K1 can be controlled to be re-closed, so as to avoid the influence on the normal work of the circuit caused by the disconnection of the magnetic latching relay K1.

[0068] In an embodiment, the first direct current power supply end 400 can provide a +12V direct current voltage, which meets the voltage comparison requirement of the second operational amplifier IC4B, it should be noted that the voltage provided by the first direct current power supply end 400 can be set according to the actual situation, and the embodiment of the present application does not make specific limitation.

[0069] As shown in FIGS. 1, 2 and 3, the control circuit of the magnetic latching relay further comprises an abnormal detection module 300 and a control module 200. Figure 2 and Figure 3 As shown in FIGS. 1, 2 and 3, the control circuit of the magnetic latching relay further comprises an abnormal detection module 300 and a control module 200.

[0070] In the embodiment, by setting the second filter module 340, the high frequency interference signal can be filtered out, so that the control module 200 can accurately detect the abnormal disconnection signal, the misoperation of the control module 200 can be avoided, the anti-interference ability of the control circuit of the magnetic latching relay is enhanced, and the working reliability of the control circuit is improved.

[0071] It should be noted that the control circuit of the magnetic latching relay may be affected by other components during the working process, and the interference signal is easy to be coupled to the line between the output end of the second operational amplifier IC4B and the input end of the control module 200, by setting the second filter module 340, the influence of the interference signal can be greatly reduced.

[0072] It can be understood that when there is an interference signal between the line between the second operational amplifier IC4B and the control module 200, the second filter module 340 can play a time delay role, since the interference signal usually has a short duration, it will not be input into the control module 200, so as to avoid the misoperation of the control module 200 caused by the interference signal in the line.

[0073] Specifically, the second filter module 340 includes an eighth resistor R8 and a fifth capacitor C5, when there is an interference signal in the line, the fifth capacitor C5 is discharged through the eighth resistor R8, and during the duration of the interference signal, if the fifth capacitor C5 is not discharged, the interference signal will not be input to the control module 200, avoiding the case that the short-term existing interference signal is input to the control module 200 and causes misoperation.

[0074] It can be understood that the magnetic latching relay K1 can be a double-coil magnetic latching relay or a single-coil magnetic latching relay, and the embodiments of the double-coil magnetic latching relay and the single-coil magnetic latching relay will be introduced below.

[0075] As shown in FIGS. 1, 2 and 3, the control circuit of the magnetic latching relay includes a control module 200 and a magnetic latching relay K1. Figure 1 and Figure 2 As shown in FIGS. 1, 2 and 3, the control circuit of the magnetic latching relay includes a control module 200 and a magnetic latching relay K1.

[0076] In this embodiment, the magnetic latching relay K1 is a double-coil magnetic latching relay, one coil of the double-coil magnetic latching relay is a closed coil, i.e., the coil between the common pin and the set pin, the closed coil is responsible for closing the contacts of the magnetic latching relay K1, and can make the magnetic latching relay K1 in the set state; the other coil of the double-coil magnetic latching relay is a reset coil, i.e., the coil between the common pin and the reset pin, the reset coil is responsible for opening the contacts of the magnetic latching relay K1, and can make the magnetic latching relay K1 in the reset state. The second DC power supply end 210 is used to provide a DC voltage to ensure the normal operation of the control module 200 and the magnetic latching relay K1.

[0077] The non-inverting input terminal of the first operational amplifier IC4A is connected to the set pin, and the inverting input terminal of the first operational amplifier IC4A is connected to the common pin. It can be understood that the two ends of the closing coil are connected to the non-inverting input terminal and the inverting input terminal of the first operational amplifier IC4A, respectively, so as to realize detection of the closing coil of the double-coil magnetic latching relay. By arranging the first switch tube Q1, when the first switch tube Q1 is turned on, the voltage of the second DC power supply end 210 can be loaded on the reset coil of the magnetic latching relay K1, so as to reset the magnetic latching relay K1. By arranging the second switch tube Q2, when the second switch tube Q2 is turned on, the voltage of the second DC power supply end 210 can be loaded on the closing coil of the magnetic latching relay K1, so as to close the magnetic latching relay K1.

[0078] When the magnetic latching relay K1 is abnormally reset, the closing coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay K1, so as to generate a voltage signal at the two ends of the closing coil, that is, to generate a voltage signal at the coil connection end 100. After the voltage signal is amplified and processed by the first operational amplifier IC4A, it is transmitted to the second operational amplifier IC4B. The second operational amplifier IC4B compares the output voltage of the first operational amplifier IC4A with the reference voltage. When the output voltage of the first operational amplifier IC4A is greater than the reference voltage, the second operational amplifier IC4B outputs an abnormal disconnection signal to the control module 200. The control module 200 can control the second switch tube Q2 to be turned on, so as to realize closing control of the magnetic latching relay K1, and to ensure that the magnetic latching relay K1 returns to the normal operating state when it is abnormally operated.

[0079] Specifically, the 4-pin, 5-pin and 3-pin of the magnetic latching relay K1 are the common pin, the reset pin and the set pin, respectively. After the control module 200 controls the second switch tube Q2 to be turned on, the 4-pin and the 3-pin at the two ends of the closing coil of the magnetic latching relay K1 bear a forward voltage. Since the first operational amplifier IC4A realizes reverse amplification of the voltage, the first operational amplifier IC4A will not amplify the closing voltage of the magnetic latching relay K1 and output it to the subsequent stage when the magnetic latching relay K1 is in the set state, so as to avoid interference with the normal operation of the control circuit. It can be understood that only when the magnetic latching relay K1 is abnormally reset, the first operational amplifier IC4A will amplify the voltage signal generated at the coil connection end 100 of the magnetic latching relay K1 and transmit it to the subsequent stage, so as to ensure the stability and working reliability of the control circuit of the magnetic latching relay.

[0080] As Figure 2As shown in the control circuit of the magnetic latching relay, the control module 200 further comprises a reset control end 230 and a set control end 220. The reset control end 230 is connected to the control pin of the first switch tube Q1 and can control the conduction of the first switch tube Q1 when a reset signal is received, so as to realize the reset of the magnetic latching relay K1. The set control end 220 is connected to the control pin of the second switch tube Q2 and can control the conduction of the second switch tube Q2 when a set signal is received, so as to realize the set of the magnetic latching relay K1. By setting the set control end 220 and the reset control end 230, the reset and set of the magnetic latching relay K1 can be controlled according to actual needs, so as to realize the efficient control of the control circuit.

[0081] In an embodiment, the control module 200 further comprises a controller, and the reset control end 230 and the set control end 220 are arranged in the controller. The controller can realize the reset control of the magnetic latching relay K1 through the reset control end 230, and in addition, the controller can realize the set control of the magnetic latching relay K1 through the set control end 220.

[0082] In an embodiment, the abnormal disconnection signal is a high-level signal. When the magnetic latching relay K1 is abnormally reset, the second operational amplifier IC4B outputs a high-level signal to the control module 200, and the control module 200 controls the conduction of the second switch tube Q2 through the set control end 220, so as to make the magnetic latching relay K1 close again.

[0083] As shown in the control circuit of the magnetic latching relay, Figure 2 As shown in the control circuit of the magnetic latching relay, the first switch tube Q1 and the second switch tube Q2 are both NPN triodes.

[0084] In the embodiment, the control pin of the first switch tube Q1 is the base, one of the switch pins of the first switch tube Q1 is the collector, and the other switch pin is the emitter. The control pin of the second switch tube Q2 is the base, one of the switch pins of the second switch tube Q2 is the collector, and the other switch pin is the emitter. Specifically, the collector of the first switch tube Q1 is connected to the reset pin of the magnetic latching relay K1, the collector of the second switch tube Q2 is connected to the set pin of the magnetic latching relay K1, and the emitter of the first switch tube Q1 and the emitter of the second switch tube Q2 are grounded. Since the first switch tube Q1 is an NPN triode, when the first switch tube Q1 is conducted, the reset control of the magnetic latching relay K1 can be realized. Similarly, since the second switch tube Q2 is an NPN triode, when the second switch tube Q2 is conducted, the set control of the magnetic latching relay K1 can be realized.

[0085] In an embodiment, the second DC power supply end 210 can provide a +12V DC voltage to ensure normal operation of the control module 200 and the magnetic latching relay K1. It should be noted that the voltage provided by the second DC power supply end 210 can be set according to actual conditions, and the embodiments of the present application do not make specific limitations.

[0086] In an embodiment, the first DC power supply end 400 and the second DC power supply end 210 can be the same power supply end, and the embodiments of the present application do not make specific limitations.

[0087] As shown in the control circuit of the magnetic latching relay, Figure 2 the first diode D1 and the second diode D2 are further included, the reset pin is connected to the positive electrode of the first diode D1, the set pin is connected to the positive electrode of the second diode D2, and the negative electrode of the first diode D1 and the negative electrode of the second diode D2 are both connected to the second DC power supply end 210.

[0088] In the present embodiment, by connecting the positive electrode of the first diode D1 to the reset pin of the magnetic latching relay K1, a freewheeling circuit is provided for the reset coil of the magnetic latching relay K1, which prevents the current of the reset coil from causing impact on the first switch tube Q1 after the first switch tube Q1 is suddenly turned off, thereby playing a role in protecting the first switch tube Q1. By connecting the positive electrode of the second diode D2 to the set pin of the magnetic latching relay K1, a freewheeling circuit is provided for the closing coil of the magnetic latching relay K1, which prevents the current of the closing coil from causing impact on the second switch tube Q2 after the second switch tube Q2 is suddenly turned off, thereby playing a role in protecting the second switch tube Q2. This is conducive to improving the stability and reliability of the control circuit of the magnetic latching relay.

[0089] As shown in the control circuit of the magnetic latching relay, Figure 3 the magnetic latching relay K1 is a single-coil magnetic latching relay, the control module 200 includes a second DC power supply end 210, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, and a sixth switch tube Q6, the second DC power supply end 210 is connected to one switch pin of the third switch tube Q3 and one switch pin of the fourth switch tube Q4, one switch pin of the fifth switch tube Q5 and one switch pin of the sixth switch tube Q6 are both grounded, the other switch pin of the third switch tube Q3 and the other switch pin of the fifth switch tube Q5 are both connected to one end of the coil connection end 100, and the other switch pin of the fourth switch tube Q4 and the other switch pin of the sixth switch tube Q6 are both connected to the other end of the coil connection end 100.

[0090] In the embodiment, the magnetic latching relay K1 is a single-coil magnetic latching relay, which is closed when a forward current is applied and is opened when a reverse current is applied. The second DC power supply end 210 is used to provide a DC voltage to ensure normal operation of the control module 200 and the magnetic latching relay K1.

[0091] Specifically, the other switch pin of the third switch tube Q3 and the other switch pin of the fifth switch tube Q5 are further connected to the inverting input terminal of the first operational amplifier IC4A, and the other switch pin of the fourth switch tube Q4 and the other switch pin of the sixth switch tube Q6 are further connected to the non-inverting input terminal of the first operational amplifier IC4A. It can be understood that the two ends of the coil connection end 100 are connected to the inverting input terminal and the non-inverting input terminal of the first operational amplifier IC4A, respectively, so that the coil of the single-coil magnetic latching relay can be detected.

[0092] It should be noted that when the third switch tube Q3 and the sixth switch tube Q6 are turned on, the voltage of the second DC power supply end 210 can be loaded on the magnetic latching relay K1 in a forward direction, so that the set control of the magnetic latching relay K1 is realized, and the contacts of the magnetic latching relay K1 are closed; when the fourth switch tube Q4 and the fifth switch tube Q5 are turned on, the voltage of the second DC power supply end 210 can be loaded on the magnetic latching relay K1 in a reverse direction, so that the reset control of the magnetic latching relay K1 is realized, and the contacts of the magnetic latching relay K1 are opened.

[0093] In an embodiment, the abnormal opening signal is a high-level signal, when the magnetic latching relay K1 is abnormally reset, the second operational amplifier IC4B outputs a high-level signal to the control module 200, and the control module 200 controls the third switch tube Q3 and the sixth switch tube Q6 to be turned on, so that the magnetic latching relay K1 is quickly closed again.

[0094] In the control circuit of the magnetic latching relay, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 are all NPN type triodes.

[0095] In the embodiment, the control pins of the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 are bases, one switch pin of the third switch tube Q3 and one switch pin of the fourth switch tube Q4 are collectors, the other switch pin of the third switch tube Q3 and the other switch pin of the fourth switch tube Q4 are emitters, one switch pin of the fifth switch tube Q5 and one switch pin of the sixth switch tube Q6 are emitters, the other switch pin of the fifth switch tube Q5 and the other switch pin of the sixth switch tube Q6 are collectors, specifically, the second DC power supply end 210 is connected to the collector of the third switch tube Q3 and the collector of the fourth switch tube Q4 respectively, the emitter of the fifth switch tube Q5 and the emitter of the sixth switch tube Q6 are grounded, the emitter of the third switch tube Q3 and the collector of the fifth switch tube Q5 are connected to one end of the coil connection end 100, the emitter of the fourth switch tube Q4 and the collector of the sixth switch tube Q6 are connected to the other end of the coil connection end 100, and meanwhile, the emitter of the fourth switch tube Q4 and the collector of the sixth switch tube Q6 are also connected to the non-inverting input end of the first operational amplifier IC4A, by allowing the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 to be NPN triodes, the reset control and the closing control of the magnetic latching relay K1 can be realized.

[0096] Those skilled in the art can understand that, Figures 1 to 3 The control circuit of the magnetic latching relay shown in the figure does not constitute a limitation on the embodiments of the present application, and can include more or fewer components than shown, or combine certain components, or different component arrangements.

[0097] The second aspect embodiment of the present application provides a circuit board comprising the control circuit of the first aspect embodiment.

[0098] According to the circuit board provided by the embodiments of the present application, when the magnetic latching relay K1 needs to be switched, the output end of the control module 200 outputs a control signal to the coil connection end 100, so that the magnetic latching relay K1 is switched to a reset state or a set state; the input end of the abnormality detection module 300 is connected to the coil connection end 100, which can continuously detect the voltage of the coil connection end 100; when the magnetic latching relay K1 abnormally resets, the coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay K1, so that the coil connection end 100 generates a voltage signal, and the abnormality detection module 300 outputs an abnormal disconnection signal to the control module 200 in response to the voltage signal, so that the control module 200 can control the magnetic latching relay K1 to be re-closed according to the abnormal disconnection signal, which is beneficial to improve the reliability of the circuit.

[0099] The third aspect embodiment of the present application provides an air conditioner comprising the control circuit of the first aspect embodiment or comprising the circuit board of the second aspect embodiment.

[0100] According to the air conditioner provided by the embodiment of the present application, when the magnetic latching relay K1 needs to be switched, the output end of the control module 200 outputs a control signal to the coil connection end 100, so that the magnetic latching relay K1 is switched to the reset state or the set state; the input end of the abnormality detection module 300 is connected to the coil connection end 100, and the voltage of the coil connection end 100 can be continuously detected; when the magnetic latching relay K1 is abnormally reset, the coil cuts the magnetic field due to the movement of the magnet inside the magnetic latching relay K1, so that the coil connection end 100 generates a voltage signal, and the abnormality detection module 300 outputs an abnormal opening signal to the control module 200 in response to the voltage signal, so that the control module 200 can control the magnetic latching relay K1 to be re-closed according to the abnormal opening signal, which is beneficial to improve the reliability of the circuit and the stability and reliability of the air conditioner.

[0101] It can be understood that the air conditioner in the embodiment of the present application can be a central air conditioner, a wall-mounted air conditioner, a stand-type air conditioner or other types of air conditioners.

[0102] In the description of the embodiments of the present application, the description of the terms "one embodiment", "another embodiment", "certain embodiments", "in the above embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are contained in at least two embodiments or embodiments of the present disclosure. In the present disclosure, the illustrative description of the above terms does not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or embodiments in a suitable manner.

[0103] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A control circuit for a magnetic latching relay, characterized by The application relates to a magnetic latching relay, which comprises a coil connection end, a control module, an abnormality detection module, a detection amplification module and a comparison module. The output end of the control module is connected to the coil connection end. The input end of the abnormality detection module is connected to the coil connection end, and the output end of the abnormality detection module is connected to the input end of the control module. The abnormality detection module outputs an abnormal opening signal to the control module in response to a voltage signal generated by the coil connection end when the magnetic latching relay is abnormally reset. The detection amplification module comprises a first operational amplifier for amplifying the voltage signal generated by the coil connection end. The comparison module comprises a second operational amplifier.

2. The control circuit of claim 1, wherein, The output end of the first operational amplifier is connected to the non-inverting input end of the second operational amplifier.

3. The control circuit of claim 1, wherein, The inverting input end of the second operational amplifier is connected to a reference voltage.

4. The control circuit of claim 1, wherein, The output end of the second operational amplifier is connected to the input end of the control module.

5. The control circuit of claim 1, wherein, The detection amplification module further comprises a first resistor, a second resistor, a third resistor and a fourth resistor. One end of the coil connection end is connected to the inverting input end of the first operational amplifier through the first resistor. The other end of the coil connection end is connected to the non-inverting input end of the first operational amplifier through the second resistor. The non-inverting input end of the first operational amplifier is grounded through the third resistor. The inverting input end of the first operational amplifier is connected to the output end of the first operational amplifier through the fourth resistor. The control module re-outputs a control signal to the coil connection end according to the abnormal opening signal received by the input end, so as to control the magnetic latching relay to be re-closed. The detection amplification module further comprises a first capacitor connected in parallel with the third resistor and a second capacitor connected in parallel with the fourth resistor. The abnormality detection module further comprises a first filter module. The first filter module comprises a fifth resistor and a third capacitor. The output end of the first operational amplifier is connected to one end of the fifth resistor. The other end of the fifth resistor is connected to one end of the third capacitor and the non-inverting input end of the second operational amplifier. The other end of the third capacitor is grounded. The comparison module further comprises a sixth resistor, a seventh resistor and a fourth capacitor. One end of the sixth resistor is connected to a first direct current power supply end. The other end of the sixth resistor is connected to the inverting input end of the second operational amplifier, one end of the seventh resistor and one end of the fourth capacitor. The other end of the seventh resistor and the other end of the fourth capacitor are grounded. The abnormality detection module further comprises a second filter module. The second filter module comprises an eighth resistor and a fifth capacitor. The output end of the second operational amplifier is connected to one end of the eighth resistor. The other end of the eighth resistor is connected to one end of the fifth capacitor and the input end of the control module. The other end of the fifth capacitor is grounded.

6. The control circuit of claim 1, wherein, The magnetic latching relay is a double-coil magnetic latching relay, the coil connection end includes a common pin, a reset pin and a set pin, the control module includes a second DC power supply end, a first switch tube and a second switch tube, the common pin is connected to the second DC power supply end and the inverting input end of the first operational amplifier, the reset pin is connected to one switch pin of the first switch tube, the set pin is connected to one switch pin of the second switch tube and the non-inverting input end of the first operational amplifier, the other switch pin of the first switch tube and the other switch pin of the second switch tube are grounded.

7. The control circuit of claim 6, wherein, Further comprising a first diode and a second diode, the reset pin is connected to the positive electrode of the first diode, the set pin is connected to the positive electrode of the second diode, the negative electrode of the first diode and the negative electrode of the second diode are both connected to the second DC power supply end.

8. The control circuit of claim 1, wherein, The magnetic latching relay is a single-coil magnetic latching relay, the control module includes a second DC power supply end, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube, the second DC power supply end is connected to one switch pin of the third switch tube and one switch pin of the fourth switch tube respectively, one switch pin of the fifth switch tube and one switch pin of the sixth switch tube are both grounded, the other switch pin of the third switch tube and the other switch pin of the fifth switch tube are both connected to one end of the coil connection end, the other switch pin of the fourth switch tube and the other switch pin of the sixth switch tube are both connected to the other end of the coil connection end.

9. A wiring board, characterized by The control circuit of any one of claims 1 to 8.

10. An air conditioner characterized by comprising: The control circuit of any one of claims 1 to 8 or the circuit board of claim 9.

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