Surge voltage suppression circuit, control method, air conditioner and storage medium

Abstract

The invention relates to the technical field of filtering, particularly provides a surge voltage suppression circuit, a control method, an air conditioner and a storage medium, and aims at solving the technical problem that an existing method is low in safety. In order to achieve the purpose, the surge voltage suppression circuit comprises a power supply input end, a filtering unit and N relay control units, the input end of the filtering unit is connected with the power input end; the output end of the filtering unit is connected with the output end of the first relay control unit; the input end of the ith relay control unit is connected with the output end of the (i-1) th relay control unit, the output end of the ith relay control unit is connected with the input end of the (i + 1) th relay control unit, i is larger than or equal to 2 and smaller than or equal to N, and N is a positive integer larger than or equal to 2. The N relay control units are connected behind the filtering unit, so that a multi-stage protection structure is formed, the surge pressure borne by a single relay is reduced, the service life of each relay is prolonged, and the stability and the safety of the whole circuit are improved.

Description

Technical Field

[0001] The present invention relates to the field of filtering technology, and specifically provides a surge voltage suppression circuit, a control method, an air conditioner and a storage medium. Background Art

[0002] A surge (also called a power surge) is a phenomenon in which voltage or current changes greatly in a short period of time, which may cause damage to air conditioning equipment.

[0003] As an important part of air conditioning equipment, the motherboard needs to take measures to protect itself from surge damage. Air conditioning may experience surges in the actual working environment, such as sudden power outages, power switch operations, lightning strikes, etc. Under this real instantaneous high-voltage electrical shock, the response, stability and reliability of air conditioning equipment are particularly critical.

[0004] The existing method generally uses safety capacitors to solve surges, but if the capacity of the safety capacitor is too large, it will easily lead to excessive leakage current. Leakage current refers to the current flowing between the power line and the ground line. This current not only increases energy consumption, but may also pose a threat to personal safety. Summary of the invention

[0005] In order to overcome the above defects, the present application is proposed to provide a solution or at least partially solve the technical problem of low safety of the existing method. The present application provides a surge voltage suppression circuit, a control method, an air conditioner and a storage medium.

[0006] In a first aspect, the present application provides a surge voltage suppression circuit, the surge voltage suppression circuit comprising a power input terminal, a filter unit, and N relay control units;

[0007] The input end of the filter unit is connected to the power input end, and the output end of the filter unit is connected to the output end of the first relay control unit;

[0008] The input end of the i-th relay control unit is connected to the output end of the i-1-th relay control unit, and the output end of the i-th relay control unit is connected to the input end of the i+1-th relay control unit, where 2≤i≤N, and N is a positive integer greater than or equal to 2.

[0009] In one embodiment of the present application, the first relay control unit includes a first relay, a second relay, a first differential mode capacitor, a first common mode capacitor, and a second common mode capacitor;

[0010] The input end of the first relay is connected to the first output end of the filter unit, the output end of the first relay is the first output end of the first relay control unit, and the output end of the first relay is simultaneously connected to the first end of the first differential mode capacitor and the first end of the second common mode capacitor;

[0011] The input end of the second relay is connected to the second output end of the filtering unit, the output end of the second relay is the second output end of the first relay control unit, the output end of the second relay is simultaneously connected to the second end of the first differential mode capacitor and the first end of the first common mode capacitor, and the second end of the first common mode capacitor and the second end of the second common mode capacitor are both grounded.

[0012] In one embodiment of the present application, the i-th relay control unit includes a third relay, a fourth relay, a second differential mode capacitor, a third common mode capacitor and a fourth common mode capacitor;

[0013] The input end of the third relay is connected to the first output end of the (i-1)th relay control unit, the output end of the third relay is the first output end of the (i)th relay control unit, and the output end of the third relay is simultaneously connected to the first end of the second differential mode capacitor and the first end of the fourth common mode capacitor;

[0014] The input end of the fourth relay is connected to the second output end of the i-1 relay control unit, the output end of the fourth relay is the second output end of the i-th relay control unit, the output end of the fourth relay is simultaneously connected to the second end of the second differential mode capacitor and the first end of the third common mode capacitor, and the second end of the third common mode capacitor and the second end of the fourth common mode capacitor are both grounded.

[0015] In one embodiment of the present application, the power input terminal includes a live line input terminal and a neutral line input terminal; the filtering unit includes an inductor, a third differential mode capacitor, a fifth common mode capacitor and a sixth common mode capacitor;

[0016] The first end of the inductor is connected to the live line input end, the second end of the inductor is connected to the neutral line input end, the third end of the inductor is the first output end of the filtering unit, and the third end of the inductor is simultaneously connected to the first end of the third differential mode capacitor and the first end of the sixth common mode capacitor; the fourth end of the inductor is the second output end of the filtering unit, and the fourth end of the inductor is simultaneously connected to the second end of the third differential mode capacitor and the first end of the fifth common mode capacitor, and the second end of the fifth common mode capacitor and the second end of the sixth common mode capacitor are both grounded.

[0017] In one embodiment of the present application, the filtering circuit further includes a fourth common-mode capacitor connected between the live line input terminal and the neutral line input terminal.

[0018] In a second aspect, a method for controlling the aforementioned surge voltage suppression circuit is provided, the method comprising:

[0019] Get the power supply voltage;

[0020] When the power supply voltage is greater than a first preset voltage, selectively turning on the first relay and the second relay;

[0021] When the power supply voltage is greater than a second preset voltage, the first relay, the second relay, the third relay and the fourth relay are selectively turned on, wherein the first preset voltage is less than the second preset voltage.

[0022] In one embodiment of the present application, the power supply voltage includes a first voltage, a second voltage and a third voltage, wherein the first voltage is a voltage between a live wire and a neutral wire, the second voltage is a voltage between a live wire and a ground wire, and the third voltage is a voltage between a neutral wire and a ground wire;

[0023] The selectively opening the first relay and the second relay comprises:

[0024] When the first voltage is greater than the first preset voltage, turning on the first relay and the second relay;

[0025] When the second voltage is greater than the first preset voltage, turning on the first relay;

[0026] When the third voltage is greater than the first preset voltage, turning on the second relay;

[0027] When the first voltage, the second voltage, and the third voltage are all greater than the first preset voltage, the first relay and the second relay are turned on.

[0028] In one embodiment of the present application, the power supply voltage includes a first voltage, a second voltage and a third voltage, wherein the first voltage is a voltage between a live wire and a neutral wire, the second voltage is a voltage between a live wire and a ground wire, and the third voltage is a voltage between a neutral wire and a ground wire;

[0029] The selectively opening the first relay, the second relay, the third relay and the fourth relay comprises:

[0030] When the first voltage is greater than the second preset voltage, turning on the first relay, the second relay, the third relay and the fourth relay in the first relay control unit;

[0031] When the second voltage is greater than the second preset voltage, turning on the first relay and the third relay in the first relay control unit;

[0032] When the third voltage is greater than the second preset voltage, turning on the second relay and a fourth relay in the first relay control unit;

[0033] When the first voltage, the second voltage and the third voltage are all greater than the second preset voltage, the first relay, the second relay, the third relay in the first relay control unit and the fourth relay are turned on.

[0034] In a third aspect, an air conditioner is provided, the air conditioner comprising the aforementioned surge voltage suppression circuit.

[0035] In a fourth aspect, a computer-readable storage medium is provided, wherein a plurality of program codes are stored in the computer-readable storage medium, wherein the program codes are suitable for being loaded and run by a processor to execute any of the aforementioned control methods for a surge voltage suppression circuit.

[0036] The above one or more technical solutions of this application have at least one or more of the following Beneficial effects:

[0037] The surge voltage suppression circuit provided in the present application includes a power input terminal, a filter unit and N relay control units, wherein the input terminal of the filter unit is connected to the power input terminal, and the output terminal of the filter unit is connected to the output terminal of the first relay control unit; the input terminal of the i-th relay control unit is connected to the output terminal of the i-1th relay control unit, and the output terminal of the i-th relay control unit is connected to the input terminal of the i+1th relay control unit, wherein 2≤i≤N, and N is a positive integer greater than or equal to 2. By connecting N relay control units after the filter unit, a multi-level protection structure is formed, which reduces the surge pressure borne by a single relay, prolongs the service life of each relay, and thus improves the stability and safety of the entire circuit; by controlling the on and off of each relay control unit, the surge energy can be absorbed and dispersed step by step, thereby providing more effective protection. In addition, the protection level can be adjusted according to specific application requirements, so that the circuit is suitable for systems of different scales and complexities. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The disclosure of the present application will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. In addition, similar numbers in the drawings are used to represent similar components, among which:

[0039] Figure 1 It is a structural schematic diagram of an existing surge voltage suppression circuit;

[0040] Figure 2 It is a main structural diagram of a surge voltage suppression circuit in one embodiment of the present application;

[0041] Figure 3 is a schematic diagram of the structure of a surge voltage suppression circuit in one embodiment of the present application;

[0042] Figure 4 It is a schematic diagram of the specific structure of a surge voltage suppression circuit in one embodiment of the present application;

[0043] Figure 5 It is a main flow chart of a control method of a surge voltage suppression circuit in one embodiment of the present application;

[0044] Figure 6 It is a complete flow chart of a control method of a surge voltage suppression circuit in one embodiment of the present application;

[0045] Figure 7 It is a main structural diagram of a control device for a surge voltage suppression circuit in one embodiment of the present application. DETAILED DESCRIPTION

[0046] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0047] In the description of the present application, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, memory, and may also include software parts, such as program code, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store program code, such as a disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B" and may include only A, only B or A and B. The singular terms "one" and "the" may also include plural forms.

[0048] At present, the traditional method generally uses safety capacitors to solve surges, but if the capacity of the safety capacitor is too large, it is easy to cause excessive leakage current. Leakage current refers to the current flowing between the power line and the ground line. This current not only increases energy consumption, but may also pose a threat to personal safety. For example, Figure 1 It can be used as an example of an existing surge suppression circuit, in which the safety capacitors include differential mode capacitors (X1 and X2) and common mode capacitors (Y1 and Y2).

[0049] See attached Figure 2 , Figure 2 Schematic diagram of the connection of a surge voltage suppression circuit according to an embodiment of the present application.

[0050] like Figure 2 As shown, the surge voltage suppression circuit in the embodiment of the present application mainly includes a power input terminal (L1 and N1), a filter unit 10 and N relay control units; the input terminal of the filter unit 10 is connected to the power input terminal (L1 and N1), and the output terminal of the filter unit 10 is connected to the output terminal of the first relay control unit 20; the input terminal of the i-th relay control unit is connected to the output terminal of the i-1-th relay control unit, and the output terminal of the i-th relay control unit is connected to the input terminal of the i+1-th relay control unit, where 2≤i≤N, and N is a positive integer greater than or equal to 2.

[0051] like Figure 2 As shown, the output terminals (L2 and N2) of the Nth relay control unit can be connected to the main board of a device (eg, an air conditioner).

[0052] By connecting N relay control units after the filter unit, a multi-level protection structure is formed, which reduces the surge pressure on a single relay and prolongs the service life of each relay, thereby improving the stability and safety of the entire circuit; by controlling the on and off of each relay control unit, the surge energy can be absorbed and dispersed step by step, thereby providing more effective protection. In addition, the protection level can be adjusted according to specific application requirements, making the circuit suitable for systems of different scales and complexities.

[0053] For example, Figure 3 As shown, 2 relay control units can be used as examples of the N relay control units.

[0054] The subsequent embodiments will describe in detail the surge voltage suppression circuit of the present application using two relay control units as an example of N relay control units. It should be noted that the two relay control units should not be used as an example of the surge voltage suppression circuit in the present application.

[0055] In a specific embodiment of the present application, the first relay control unit includes a first relay, a second relay, a first differential mode capacitor, a first common mode capacitor and a second common mode capacitor; the input end of the first relay is connected to the first output end of the filtering unit, the output end of the first relay is the first output end of the first relay control unit, and the output end of the first relay is simultaneously connected to the first end of the first differential mode capacitor and the first end of the second common mode capacitor; the input end of the second relay is connected to the second output end of the filtering unit, the output end of the second relay is the second output end of the first relay control unit, the output end of the second relay is simultaneously connected to the second end of the first differential mode capacitor and the first end of the first common mode capacitor, and the second end of the first common mode capacitor and the second end of the second common mode capacitor are both grounded.

[0056] Specifically, if Figure 4 As shown, the first relay control unit 20 includes a first relay FU1, a second relay FU2, a first differential mode capacitor X3, a first common mode capacitor Y3 and a second common mode capacitor Y4; the input end of the first relay FU1 is connected to the first output end of the filter unit 10, the output end of the first relay FU1 is the first output end of the first relay control unit 20, and the output end of the first relay FU1 is simultaneously connected to the first end of the first differential mode capacitor X3 and the first end of the second common mode capacitor Y4.

[0057] The input end of the second relay FU2 is connected to the second output end of the filter unit 10, the output end of the second relay FU2 is the second output end of the first relay control unit 20, the output end of the second relay FU2 is simultaneously connected to the second end of the first differential mode capacitor X3 and the first end of the first common mode capacitor Y3, and the second end of the first common mode capacitor X3 and the second end of the second common mode capacitor Y4 are both grounded PE.

[0058] In a specific embodiment of the present application, the i-th relay control unit includes a third relay, a fourth relay, a second differential mode capacitor, a third common mode capacitor and a fourth common mode capacitor; the input end of the third relay is connected to the first output end of the i-1th relay control unit, the output end of the third relay is the first output end of the i-th relay control unit, and the output end of the third relay is simultaneously connected to the first end of the second differential mode capacitor and the first end of the fourth common mode capacitor; the input end of the fourth relay is connected to the second output end of the i-1 relay control unit, the output end of the fourth relay is the second output end of the i-th relay control unit, the output end of the fourth relay is simultaneously connected to the second end of the second differential mode capacitor and the first end of the third common mode capacitor, and the second end of the third common mode capacitor and the second end of the fourth common mode capacitor are both grounded.

[0059] Specifically, if Figure 4 As shown, the second relay control unit 30 includes a third relay FU3, a fourth relay FU4, a second differential mode capacitor X4, a third common mode capacitor Y5 and a fourth common mode capacitor Y6; the input end of the third relay FU3 is connected to the first output end of the first relay control unit 20, the output end of the third relay FU3 is the first output end of the second relay control unit 30, and the output end of the third relay FU3 is simultaneously connected to the first end of the second differential mode capacitor X4 and the first end of the fourth common mode capacitor Y6.

[0060] The input end of the fourth relay FU4 is connected to the second output end of the first relay control unit 20, the output end of the fourth relay FU4 is the second output end of the second relay control unit 30, the output end of the fourth relay FU4 is simultaneously connected to the second end of the second differential mode capacitor X4 and the first end of the third common mode capacitor Y5, and the second end of the third common mode capacitor Y5 and the second end of the fourth common mode capacitor Y6 are both grounded.

[0061] In a specific embodiment of the present application, the power input end includes a live wire input end L1 and a neutral wire input end L2; the filtering unit 10 includes an inductor L, a third differential mode capacitor X2, a fifth common mode capacitor Y1 and a sixth common mode capacitor Y2; the first end of the inductor L is connected to the live wire input end L1, the second end of the inductor L is connected to the neutral line input end N1, the third end of the inductor L is the first output end of the filtering unit 10, and the third end of the inductor 10 is simultaneously connected to the first end of the third differential mode capacitor X2 and the first end of the sixth common mode capacitor Y2; the fourth end of the inductor L is the second output end of the filtering unit 10, the fourth end of the inductor L is simultaneously connected to the second end of the third differential mode capacitor X2 and the first end of the fifth common mode capacitor Y1, and the second end of the fifth common mode capacitor Y1 and the second end of the sixth common mode capacitor Y2 are both grounded PE.

[0062] In a specific implementation of the present application, the filter circuit 10 further includes a fourth common-mode capacitor X1 , and the fourth common-mode capacitor X1 is connected between the live line input terminal L1 and the neutral line input terminal N1 .

[0063] Specifically, the differential mode capacitor in the present application is used to suppress differential mode interference, and the common mode capacitor is used to block the passage of DC voltage while allowing AC current to pass through, so as to suppress common mode interference.

[0064] It should be noted that if the common-mode capacitor is too large, it will lead to too much leakage current, causing safety hazards. It is generally required that the common-mode capacitor undergo a 1500V voltage withstand test and the leakage current be less than 15mA (milliamperes).

[0065] The differential mode capacitor must have a sufficient withstand voltage rating to withstand the maximum voltage that may occur. For example, for a 220V power system, the withstand voltage of the capacitor usually needs to be 400V or above. The capacity of the differential mode capacitor needs to be selected according to the specific application requirements. Generally speaking, the larger the capacity, the better the surge suppression effect, but too large a capacity will cause the leakage current to increase, affecting the safety and energy consumption of the equipment. The selected differential mode capacitor needs to control the leakage current within a safe range. Excessive leakage current will not only increase energy consumption, but may also cause the equipment to overheat and even pose a safety hazard.

[0066] See attached Figure 5 , Figure 5 It is a flowchart diagram of main steps of a method for controlling a surge voltage suppression circuit according to an embodiment of the present application.

[0067] like Figure 5 As shown, the control method of the surge voltage suppression circuit in the embodiment of the present application mainly includes the following steps S10 to S30.

[0068] Step S10: Obtain the power supply voltage.

[0069] Specifically, the power supply voltage includes a voltage between the live wire L1 and the neutral wire N1 , a voltage between the live wire L1 and the ground wire PE, and a voltage between the neutral wire N1 and the ground wire PE.

[0070] Step S20: When the power supply voltage is greater than the first preset voltage, selectively turning on the first relay and the second relay.

[0071] The first preset voltage is a voltage value obtained in advance according to experiments, and can be adaptively adjusted according to actual usage scenarios. For example, 2000V, 2050V, 2100V, etc. can be used as examples of the first preset voltage.

[0072] Step S30: When the power supply voltage is greater than a second preset voltage, selectively turning on the first relay, the second relay, the third relay and the fourth relay, wherein the first preset voltage is less than the second preset voltage.

[0073] The second preset voltage is a voltage value obtained in advance according to experiments, and can be adaptively adjusted according to the actual usage scenario. For example, when N=2, 6000V, 6050V, 6100V, etc. can be used as examples of the second preset voltage; when N=3, 9000V, 9050V, 9100V, etc. can be used as examples of the second preset voltage, and when N is a number greater than 3, the same applies.

[0074] Based on the above steps S10-S30, first obtain the power supply voltage; when the power supply voltage is greater than the first preset voltage, selectively turn on the first relay and the second relay; when the power supply voltage is greater than the second preset voltage, selectively turn on the first relay, the second relay, the third relay and the fourth relay, wherein the first preset voltage is less than the second preset voltage, to ensure that when the power supply voltage rises abnormally, the excessive voltage can be cut off or diverted in time, thereby protecting the back-end equipment from damage and improving the overall safety of the system. In this way, by setting different preset voltage thresholds, a hierarchical protection mechanism is implemented, which means that as the power supply voltage increases, more protection measures will be activated, thereby providing a higher level of protection. In addition, the state of the relay can be dynamically adjusted according to the actual change of the power supply voltage. When the power supply voltage exceeds a certain preset value, the corresponding relay will be turned on, thereby responding to potential surge voltages in a timely manner, improving the reliability and safety of the circuit.

[0075] Subsequently, two relay control units will be used as an example of N control units to explain in detail the control method of the surge voltage suppression circuit of the present application. It should be noted that the two relay control units should not be used as a limitation on the control method of the present application.

[0076] The above steps S10 to S30 are further explained below.

[0077] For step S10, a voltage sensor may be used to monitor the power supply voltage, and the voltage sensor may convert a voltage signal into an electrical signal that can be read by the system. Alternatively, the power supply voltage may be scaled down by a voltage detection circuit, such as a voltage divider resistor network, and then the scaled down voltage signal may be converted into a digital signal by an analog-to-digital converter (ADC).

[0078] The above is a further description of step S10 , and the following is a further description of step S20 .

[0079] Specifically, the power supply voltage includes a first voltage, a second voltage and a third voltage, wherein the first voltage is the voltage between the live wire L1 and the neutral wire N1, the second voltage is the voltage between the live wire L1 and the ground wire PE, and the third voltage is the voltage between the neutral wire N1 and the ground wire PE.

[0080] In a specific embodiment of the present application, selectively turning on the first relay and the second relay includes: turning on the first relay and the second relay when the first voltage is greater than the first preset voltage; turning on the first relay when the second voltage is greater than the first preset voltage; turning on the second relay when the third voltage is greater than the first preset voltage; turning on the first relay and the second relay when the first voltage, the second voltage and the third voltage are all greater than the first preset voltage.

[0081] Specifically, when it is detected that the voltage between the live wire (L1) and the neutral wire (N1) exceeds a pre-set first preset voltage value, the first relay and the second relay are turned on at the same time. At this time, in the case of excessive power supply voltage or surge, the differential mode capacitor X3, common mode inductor Y3, and common mode capacitor Y4 are used to shunt the excessive voltage to protect the back-end circuit or the mainboard.

[0082] When it is detected that the voltage between the live wire (L1) and the ground wire (PE) exceeds a preset first voltage value, the first relay is turned on. At this time, due to overvoltage or leakage between the live wire L1 and the ground wire PE, turning on the first relay helps to guide the current to prevent equipment damage or ensure personnel safety.

[0083] When it is detected that the voltage between the neutral line (N1) and the ground line (PE) exceeds a preset first voltage value, the second relay is turned on. At this time, due to overvoltage or leakage between the neutral line and the ground line, the second relay is turned on to protect the safety of the circuit and equipment.

[0084] When it is detected that the voltages between the live wire L1 and the neutral wire N1, between the live wire L1 and the ground wire PE, and between the neutral wire N1 and the ground wire PE all exceed a preset threshold, the first relay and the second relay may be turned on simultaneously.

[0085] The voltage between the live wire and the neutral wire, the live wire and the ground wire, and the neutral wire and the ground wire is monitored in real time by a voltage sensor or a voltage detection circuit, and the detected voltage is compared with a preset threshold value. According to the comparison result, it is decided whether to turn on the corresponding relay. If the voltage between the live wire and the neutral wire exceeds the first preset value, the first relay and the second relay are turned on at the same time, which can effectively disperse the voltage and prevent equipment damage caused by overload. If the voltage between the live wire and the ground wire exceeds the first preset value, the first relay is turned on. If the voltage between the neutral wire and the ground wire exceeds the first preset value, the second relay is turned on. By using different relays in combination, multi-layer protection can be provided to ensure that the circuit is safe and reliable even when the power supply voltage is too high.

[0086] The above is a further description of step S20 , and the following is a further description of step S30 .

[0087] In a specific embodiment of the present application, the power supply voltage includes a first voltage, a second voltage and a third voltage, wherein the first voltage is the voltage between the live wire and the neutral wire, the second voltage is the voltage between the live wire and the ground wire, and the third voltage is the voltage between the neutral wire and the ground wire; the selective opening of the first relay, the second relay, the third relay and the fourth relay includes: when the first voltage is greater than the second preset voltage, opening the first relay, the second relay, the third relay and the fourth relay; when the second voltage is greater than the second preset voltage, opening the first relay and the third relay; when the third voltage is greater than the second preset voltage, opening the second relay and the fourth relay; when the first voltage, the second voltage and the third voltage are all greater than the second preset voltage, opening the first relay, the second relay, the third relay and the fourth relay.

[0088] Specifically, taking two relay control units as an example, when the first voltage is greater than the second preset voltage, the first relay, the second relay, the third relay in the second relay control unit, and the fourth relay are turned on at the same time, thereby dividing the excessive voltage between the live wire and the neutral wire to protect the circuit and equipment. When the second voltage is greater than the second preset voltage, the first relay and the third relay in the second relay control unit are turned on, thereby dividing the excessive voltage between the live wire and the ground wire to protect the circuit and equipment. When the third voltage is greater than the second preset voltage, the second relay and the fourth relay in the second relay control unit are turned on, thereby dividing the excessive voltage between the neutral wire and the ground wire to protect the circuit and equipment.

[0089] Figure 6 1 is a complete structural diagram of a control method for a surge voltage suppression circuit in one embodiment of the present application. Figure 6 As shown, taking an air conditioner as an example, the control method of the surge voltage suppression circuit can be specifically implemented through the following steps S1-S7.

[0090] Step S1: collecting the instantaneous voltages of the live wire L1, the neutral wire N1 and the ground wire PE of the air conditioner.

[0091] Step S2: Send the collected three-way voltage to the main controller MCU of the air conditioner.

[0092] Step S3: The main controller sends different instructions to the corresponding relays according to the instantaneous voltage.

[0093] Step S4: The corresponding relays are energized to connect different safety capacitors.

[0094] Specifically, the specific control logic can be:

[0095] When it is detected that the voltage between the live wire L1 and the neutral wire N1 is higher than the first preset voltage, the MCU sends a command to the relay FU1 and the relay FU2 to close the relay FU1 and the relay FU2.

[0096] When it is detected that the voltage between L1 and PE is higher than the first preset voltage, the MCU sends a command to the relay FU1 to close the relay FU1.

[0097] When it is detected that the voltage between N1 and PE is higher than the first preset voltage, the MCU sends a command to the relay FU2 to close the relay FU2.

[0098] When it is detected that the three voltages between L1 and N1, L1 and PE, and N1 and PE are all higher than the first voltage preset value, the MCU sends instructions to the relay FU1 and the relay FU2 to close the relay FU1 and the relay FU2.

[0099] When it is detected that the voltage between L1 and N1 is higher than the second voltage preset value, the MCU sends instructions to the relays FU1, FU2, FU3 and FU4 to close the relays FU1, FU2, FU3 and FU4.

[0100] When it is detected that the voltage between L1 and PE is higher than the second voltage preset value, the MCU sends a command to the relay FU1 and the relay FU3 to close the relay FU1 and the relay FU3.

[0101] When it is detected that the voltage between N1 and PE is higher than the second voltage preset value, the MCU sends a command to the relay FU2 and the relay FU4 to close the relay FU2 and the relay FU4.

[0102] When it is detected that the three voltages between L1 and N1, L1 and PE, and N1 and PE are all higher than the second voltage preset value, the MCU sends instructions to relay FU1, relay FU2, relay FU3 and relay FU4 to close relay FU1, relay FU2, relay FU3 and relay FU4.

[0103] By controlling the connected safety capacitors, the capacitors can be connected under different voltage instantaneous impacts, thereby ensuring the reliability and safety of the air conditioner, and ensuring the air conditioner's ability to resist surge impacts and leakage current safety.

[0104] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effect of the present application, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present application.

[0105] Furthermore, the present application also provides a control device for a surge voltage suppression circuit.

[0106] See attached Figure 7 , Figure 7 It is a main structural block diagram of a control device for a surge voltage suppression circuit according to an embodiment of the present application.

[0107] like Figure 7 As shown, the control device of the surge voltage suppression circuit in the embodiment of the present application mainly includes an acquisition module 11, a first control module 12 and a second control module 13. In some embodiments, one or more of the acquisition module 11, the first control module 12 and the second control module 13 can be combined into one module.

[0108] In some embodiments, the acquisition module 11 may be configured to acquire a power supply voltage.

[0109] The first control module 12 may be configured to selectively turn on the first relay and the second relay in the first relay control unit when the power supply voltage is greater than a first preset voltage.

[0110] The second control module 13 may be configured to selectively turn on the first relay, the second relay, the third relay and the fourth relay when the power supply voltage is greater than a second preset voltage, wherein the first preset voltage is less than the second preset voltage.

[0111] In one implementation, the description of the specific implementation functions can refer to steps S10-S30.

[0112] The control device of the surge voltage suppression circuit is used to perform Figure 5 The control method embodiment of the surge voltage suppression circuit shown in the figure has similar technical principles, technical problems solved and technical effects produced. Technicians in this technical field can clearly understand that for the convenience and conciseness of description, the specific working process and related instructions of the control device of the surge voltage suppression circuit can refer to the contents described in the embodiment of the control method of the surge voltage suppression circuit, which will not be repeated here.

[0113] Further, it should be understood that since the setting of each module is only for illustrating the functional units of the device of the present application, the physical devices corresponding to these modules may be the processor itself, or a part of the software in the processor, a part of the hardware, or a part of the combination of software and hardware. Therefore, the number of each module in the figure is only schematic.

[0114] It is understood by those skilled in the art that each module in the device can be adaptively split or merged. Such splitting or merging of specific modules will not cause the technical solution to deviate from the principle of the present application, and therefore, the technical solutions after splitting or merging will fall within the protection scope of the present application.

[0115] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above-mentioned embodiment of the present application can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium, etc. that can carry the computer program code.

[0116] Furthermore, the present application also provides an air conditioner, which may include the aforementioned surge voltage suppression circuit.

[0117] Furthermore, the present application also provides a computer-readable storage medium. In a computer-readable storage medium embodiment according to the present application, the computer-readable storage medium can be configured to store a program for executing the control method of the surge voltage suppression circuit of the above-mentioned method embodiment, and the program can be loaded and run by the processor to implement the control method of the above-mentioned surge voltage suppression circuit. For ease of explanation, only the parts related to the embodiment of the present application are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present application. The computer-readable storage medium can be a memory device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present application is a non-temporary computer-readable storage medium.

[0118] So far, the technical solutions of the present application have been described in conjunction with the specific implementations shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific implementations. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A surge voltage suppression circuit, characterized in that: The surge voltage suppression circuit includes a power input terminal, a filter unit and N relay control units; The input end of the filter unit is connected to the power input end, and the output end of the filter unit is connected to the output end of the first relay control unit; the input end of the i-th relay control unit is connected to the output end of the i-1th relay control unit, and the output end of the i-th relay control unit is connected to the input end of the i+1th relay control unit, where 2≤i≤N, and N is a positive integer greater than or equal to 2.

2. The surge voltage suppression circuit according to claim 1, characterized in that: The first relay control unit includes a first relay, a second relay, a first differential mode capacitor, a first common mode capacitor, and a second common mode capacitor; The input end of the first relay is connected to the first output end of the filter unit, the output end of the first relay is the first output end of the first relay control unit, and the output end of the first relay is simultaneously connected to the first end of the first differential mode capacitor and the first end of the second common mode capacitor; The input end of the second relay is connected to the second output end of the filtering unit, the output end of the second relay is the second output end of the first relay control unit, the output end of the second relay is simultaneously connected to the second end of the first differential mode capacitor and the first end of the first common mode capacitor, and the second end of the first common mode capacitor and the second end of the second common mode capacitor are both grounded.

3. The surge voltage suppression circuit according to claim 1, characterized in that: The i-th relay control unit includes a third relay, a fourth relay, a second differential mode capacitor, a third common mode capacitor and a fourth common mode capacitor; The input end of the third relay is connected to the first output end of the (i-1)th relay control unit, the output end of the third relay is the first output end of the (i)th relay control unit, and the output end of the third relay is simultaneously connected to the first end of the second differential mode capacitor and the first end of the fourth common mode capacitor; The input end of the fourth relay is connected to the second output end of the i-1 relay control unit, the output end of the fourth relay is the second output end of the i-th relay control unit, the output end of the fourth relay is simultaneously connected to the second end of the second differential mode capacitor and the first end of the third common mode capacitor, and the second end of the third common mode capacitor and the second end of the fourth common mode capacitor are both grounded.

4. The surge voltage suppression circuit according to claim 1, characterized in that: The power input terminal includes a live line input terminal and a neutral line input terminal; the filtering unit includes an inductor, a third differential mode capacitor, a fifth common mode capacitor and a sixth common mode capacitor; The first end of the inductor is connected to the live line input end, the second end of the inductor is connected to the neutral line input end, the third end of the inductor is the first output end of the filtering unit, and the third end of the inductor is simultaneously connected to the first end of the third differential mode capacitor and the first end of the sixth common mode capacitor; the fourth end of the inductor is the second output end of the filtering unit, and the fourth end of the inductor is simultaneously connected to the second end of the third differential mode capacitor and the first end of the fifth common mode capacitor, and the second end of the fifth common mode capacitor and the second end of the sixth common mode capacitor are both grounded.

5. The surge voltage suppression circuit according to claim 4, characterized in that: The filtering circuit further includes a fourth common-mode capacitor connected between the live line input terminal and the neutral line input terminal.

6. A control method for a surge voltage suppression circuit according to any one of claims 1 to 5, characterized in that: The method comprises: Get the power supply voltage; When the power supply voltage is greater than a first preset voltage, selectively turning on the first relay and the second relay; When the power supply voltage is greater than a second preset voltage, the first relay, the second relay, the third relay and the fourth relay are selectively turned on, wherein the first preset voltage is less than the second preset voltage.

7. The control method according to claim 6, characterized in that: The power supply voltage includes a first voltage, a second voltage and a third voltage, wherein the first voltage is a voltage between a live wire and a neutral wire, the second voltage is a voltage between a live wire and a ground wire, and the third voltage is a voltage between a neutral wire and a ground wire; The selectively opening the first relay and the second relay comprises: When the first voltage is greater than the first preset voltage, turning on the first relay and the second relay; When the second voltage is greater than the first preset voltage, turning on the first relay; When the third voltage is greater than the first preset voltage, turning on the second relay; When the first voltage, the second voltage, and the third voltage are all greater than the first preset voltage, the first relay and the second relay are turned on.

8. The control method according to claim 6, characterized in that: The power supply voltage includes a first voltage, a second voltage and a third voltage, wherein the first voltage is a voltage between a live wire and a neutral wire, the second voltage is a voltage between a live wire and a ground wire, and the third voltage is a voltage between a neutral wire and a ground wire; The selectively opening the first relay, the second relay, the third relay and the fourth relay comprises: When the first voltage is greater than the second preset voltage, turning on the first relay, the second relay, the third relay and the fourth relay; When the second voltage is greater than the second preset voltage, turning on the first relay and the third relay; When the third voltage is greater than the second preset voltage, turning on the second relay and the fourth relay; When the first voltage, the second voltage and the third voltage are all greater than the second preset voltage, the first relay, the second relay, the third relay and the fourth relay are turned on.

9. An air conditioner, characterized in that: The air conditioner comprises the surge voltage suppression circuit according to any one of claims 1 to 5.

10. A computer-readable storage medium storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by a processor to execute the control method according to any one of claims 6 to 8.

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