Anti-surge circuit, refrigerator and electrical equipment

Abstract

The utility model relates to the technical field of circuit surge processing, and provides an anti-surge circuit, a refrigerator and electrical equipment. The input end of the electromagnetic interference filtering module is connected with the power supply connecting module, and the output end of the electromagnetic interference filtering module is used for being connected with a load; the discharging module is connected with the output end of the electromagnetic interference filtering module, the discharging module is grounded, and the discharging module is used for releasing voltage larger than a threshold value to the ground. By means of the structure that the output end of the electromagnetic interference filtering module is connected with the discharging module, under the condition that the electromagnetic interference filtering module is arranged, surge voltage can be released to the ground after electromagnetic interference filtering is carried out, the situation that the surge voltage is subjected to resonance amplification, and consequently circuit devices at the rear end are damaged is avoided, and improvement of the reliability of the circuit is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit surge processing, in particular to an anti-surge circuit, a refrigerator and electrical equipment. Background Art

[0002] In the prior art, in order to prevent power surge from damaging the circuit, a discharge circuit is usually provided at the connection of the power supply to discharge the surge voltage to the ground, thereby reducing the impact of the surge voltage and protecting the circuit components.

[0003] However, in the case of an EMI (Electron magnetic Interference) filtering circuit, even after a portion of the surge voltage is released, since the surge voltage frequency is uncertain and usually contains multiple frequency components, the residual surge voltage will be amplified when the frequency of the residual surge voltage meets the resonance condition of the LC circuit in the EMI filtering circuit. As a result, there is a problem that the amplified residual surge voltage may cause damage to the back-end circuit devices, affecting the reliability of the circuit.

[0004] Therefore, when an EMI filter circuit is provided, how to prevent surges from causing damage to the back-end circuit components is an issue that needs to be solved urgently. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model proposes an anti-surge circuit to prevent surges from damaging the circuit components at the rear end when an EMI filter circuit is provided.

[0006] The utility model also provides a refrigerator and electrical equipment.

[0007] According to the first aspect of the utility model, the surge protection circuit includes: a power supply connection module; an electromagnetic interference filter module, the input end of the electromagnetic interference filter module is connected to the power supply connection module, and the output end of the electromagnetic interference filter module is used to connect to a load; a discharge module, connected to the output end of the electromagnetic interference filter module, the discharge module is grounded, and the discharge module is used to release a voltage greater than a threshold to the ground.

[0008] According to an embodiment of the utility model, the discharge module includes a first discharge tube and a varistor, the varistor is connected to the output end of the electromagnetic interference filter module, one end of the first discharge tube is connected to the varistor, and the other end of the first discharge tube is grounded.

[0009] According to one embodiment of the utility model, the varistor includes a first varistor and a second varistor, one end of the first varistor is connected to the first output end of the electromagnetic interference filtering module, one end of the second varistor is connected to the second output end of the electromagnetic interference filtering module, and one end of the first discharge tube is respectively connected to the other end of the first varistor and the other end of the second varistor.

[0010] According to one embodiment of the utility model, the electromagnetic interference filtering module includes a common-mode inductor and a surge discharge module, the input end of the common-mode inductor is connected to the power supply connection module, the output end of the common-mode inductor is connected to the discharge module, and the surge discharge module is connected to the common-mode inductor. The surge discharge module is used to conduct the input end of the common-mode inductor and the output end of the common-mode inductor when the voltage of the common-mode inductor is greater than a threshold value.

[0011] According to an embodiment of the utility model, the common-mode inductor includes a coupled first coil and a second coil, the surge discharge module includes a second discharge tube and a third discharge tube, one end of the first coil and one end of the second coil are both connected to the power supply connection module, the other end of the first coil and the other end of the second coil are both connected to the discharge module, the second discharge tube is connected in parallel with the first coil, and the third discharge tube is connected in parallel with the second coil.

[0012] According to an embodiment of the utility model, the electromagnetic interference filtering module also includes a first differential mode capacitor, a second differential mode capacitor, a first common mode capacitor, a second common mode capacitor and a grounding resistor, one end of the first differential mode capacitor is connected to the first input end of the common mode inductor, the other end of the first differential mode capacitor is connected to the second input end of the common mode inductor, one end of the second differential mode capacitor is connected to the first output end of the common mode inductor, the other end of the second differential mode capacitor is connected to the second output end of the common mode inductor, one end of the first common mode capacitor is connected to the first output end of the common mode inductor, one end of the second common mode capacitor is connected to the second output end of the common mode inductor, the other end of the first common mode capacitor and the other end of the second common mode capacitor are both connected to one end of the grounding resistor, and the other end of the grounding resistor is grounded.

[0013] According to one embodiment of the utility model, the power supply connection module includes a power connection terminal, a fuse and a differential mode varistor, the first connection end of the power connection terminal is connected to one end of the fuse, the other end of the fuse is respectively connected to one end of the differential mode varistor and the first input end of the electromagnetic interference filtering module, and the second connection end of the power connection terminal is respectively connected to the other end of the differential mode varistor and the second input end of the electromagnetic interference filtering module.

[0014] According to an embodiment of the utility model, it also includes an energy release module connected to the electromagnetic interference filter module, and the energy release module is used to release the energy stored in the electromagnetic interference filter module when the power is off.

[0015] According to the refrigerator of the second aspect embodiment of the utility model, it includes a body, the body is provided with the above-mentioned surge protection circuit, the body is also provided with a rectifier circuit, an inverter circuit and a compressor load module, the output end of the electromagnetic interference filter module is connected to the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the input end of the inverter circuit, and the output end of the inverter circuit is connected to the compressor load module.

[0016] The electrical device according to the third aspect of the embodiments of the present utility model comprises a device body, and the device body is provided with the above-mentioned surge protection circuit.

[0017] The above one or more technical solutions in the embodiment of the utility model have at least one of the following technical effects: the power supply connection module is connected to the power supply to obtain electric energy, and the electromagnetic interference filter module filters the electric energy output by the power supply connection module to filter out electromagnetic interference and reduce the influence of electromagnetic interference on the voltage. Under normal circumstances, the voltage output by the electromagnetic interference filter module is transmitted to the circuit components of the rear-end load, and when the voltage output by the electromagnetic interference filter module is greater than the threshold of the discharge module, that is, when a surge voltage occurs, the discharge module releases the surge voltage to the ground to avoid the surge voltage being transmitted to the rear-end circuit components. In this way, by connecting the structure of the discharge module to the output end of the electromagnetic interference filter module, it is possible to release the surge voltage to the ground after the electromagnetic interference filtering when the electromagnetic interference filter module is provided, so as to avoid the surge voltage being resonantly amplified to cause damage to the rear-end circuit components, which is conducive to improving the reliability of the circuit.

[0018] Furthermore, by connecting the surge discharge module to the common-mode inductor, when the voltage of the common-mode inductor is greater than the threshold, that is, when a surge voltage occurs, the surge discharge module turns on the input and output ends of the common-mode inductor, which is equivalent to short-circuiting the two ends of the common-mode inductor, thereby preventing the LC oscillation between the common-mode inductor and other capacitors from further amplifying the surge voltage and preventing the formation of a larger surge voltage. The subsequent surge voltage is released to the ground through the discharge module. In this way, the structure of connecting the surge discharge module to the common-mode inductor can avoid the situation of resonant amplification of the surge voltage, which is conducive to improving safety. At the same time, the surge discharge module is also conducive to protecting the common-mode inductor, avoiding excessive voltage leading to excessive current, which causes magnetic saturation problems in the common-mode inductor, and is conducive to improving reliability.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a circuit diagram of one embodiment of the surge protection circuit provided by the embodiment of the utility model.

[0022] Figure 2 It is a structural block diagram of one embodiment of the refrigerator provided by the utility model.

[0023] Figure 3 It is a circuit diagram of an inverter circuit and a compressor load module of one embodiment of a refrigerator provided by the utility model.

[0024] Reference numerals:

[0025] 100, power supply connection module; 200, electromagnetic interference filter module; 110, power connection terminal; 120, fuse; 130, differential mode varistor; 210, common mode inductor; 300, discharge module; 310, first discharge tube; 320, varistor unit; 321, first varistor; 322, second varistor; 400, surge discharge module; 410, second discharge tube; 420, third discharge tube; 500, energy release module; 600, rectifier circuit; 700, inverter circuit; 800, compressor load module. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0027] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0029] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] In the prior art, the discharge circuit is set at the power input. Even after the discharge circuit processes the surge voltage generated by the power supply, the residual surge voltage will be amplified through the LC resonance of the EMI filter circuit, thereby affecting the normal operation of the back-end circuit components and even damaging the circuit components. For ease of understanding, an example is given to illustrate: assuming that the discharge circuit can filter out the surge voltage greater than 3.6KV, but the residual surge voltage less than 3.6KV, such as the residual surge voltage of 3.5KV, reaches 6KV after resonance amplification, which may exceed the withstand voltage of the back-end components and cause the components to burn out, or breakdown occurs when the insulation distance is insufficient, posing a safety hazard.

[0032] refer to Figure 1 The utility model provides an anti-surge circuit, including: a power supply connection module 100; an electromagnetic interference filter module 200, the input end of the electromagnetic interference filter module 200 is connected to the power supply connection module 100, and the output end of the electromagnetic interference filter module 200 is used to connect to the load; a discharge module 300, connected to the output end of the electromagnetic interference filter module 200, the discharge module 300 is grounded, and the discharge module 300 is used to release a voltage greater than a threshold to the ground.

[0033] The power supply connection module 100 is connected to the power supply to obtain electric energy, and the electromagnetic interference filter module 200 filters the electric energy output by the power supply connection module 100 to filter out electromagnetic interference and reduce the influence of electromagnetic interference on the voltage. Under normal circumstances, the voltage output by the electromagnetic interference filter module 200 is transmitted to the circuit components of the rear-end load, and when the voltage output by the electromagnetic interference filter module 200 is greater than the threshold of the discharge module 300, that is, when a surge voltage occurs, the discharge module 300 releases the surge voltage to the ground to prevent the surge voltage from being transmitted to the rear-end circuit components. In this way, by connecting the discharge module 300 to the output end of the electromagnetic interference filter module 200, it is possible to release the surge voltage to the ground after electromagnetic interference filtering in the case where the electromagnetic interference filter module 200 is provided, so as to prevent the surge voltage from being resonantly amplified and causing damage to the rear-end circuit components, which is conducive to improving the reliability of the circuit.

[0034] The power supply connection module 100 can be connected to a power supply such as a mains power supply or a generator to obtain electrical energy.

[0035] It can be understood that a circuit usually needs two connection terminals to form a loop. Therefore, the power supply connection module has at least two input terminals, which correspond to the live wire and the neutral wire when the input is AC power. In some embodiments, a ground wire input terminal may also be provided. The power supply connection module has two output terminals. The electromagnetic interference filtering module 200 has two input terminals and two output terminals accordingly, and the discharge module 300 has two connection terminals.

[0036] refer to Figure 1 In some embodiments of the surge protection circuit of the utility model, the discharge module 300 includes a first discharge tube 310 and a pressure-sensitive unit 320, the pressure-sensitive unit 320 is connected to the output end of the electromagnetic interference filter module 200, one end of the first discharge tube 310 is connected to the pressure-sensitive unit 320, and the other end of the first discharge tube 310 is grounded.

[0037] When a surge voltage occurs, the resistance of the varistor 320 decreases and the first discharge tube 310 is turned on, so that the voltage at the output end of the electromagnetic interference filter module 200 is released to the ground. When the voltage at the output end of the electromagnetic interference filter module 200 decreases to a value lower than the threshold of the varistor 320, that is, after the surge voltage is released, the resistance of the varistor 320 increases, so that the voltage applied to the first discharge tube 310 decreases, and the first discharge tube 310 is turned off. In this way, through the structure of the varistor 320 and the first discharge tube 310, the surge voltage can be automatically released to the ground when a surge voltage occurs, without the need for voltage detection and judgment processing, which is conducive to improving the reliability of the circuit and is convenient for implementation and application.

[0038] It should be noted that after the first discharge tube 310 is triggered to turn on when the voltage is greater than its threshold, the first discharge tube 310 only needs a relatively low voltage to maintain the on state. For this, the pressure-sensitive unit 320 is connected in series with the first discharge tube 310 to divide the voltage. After the surge voltage is released to reduce the voltage, the resistance of the pressure-sensitive unit 320 increases, so that the voltage of the first discharge tube 310 is reduced and then cut off and restored, so as to avoid the first discharge tube 310 being in the on state all the time. The structure of the first discharge tube 310 and the pressure-sensitive unit 320 can adapt to the high-voltage working environment. Usually, the on-voltage of the first discharge tube 310 is greater than the trigger voltage of the pressure-sensitive unit 320. Therefore, the voltage threshold for triggering the release of electric energy to the ground is mainly determined by the on-voltage of the first discharge tube 310. A suitable type of discharge tube can be selected as the first discharge tube 310 according to actual application requirements to set the voltage threshold of discharge.

[0039] In some embodiments of the present invention, the discharge module 300 may also be an implementation method including a voltage detection circuit and a switch tube, which are connected to the output end of the electromagnetic interference filter module 200 through the voltage detection circuit and the switch tube. When the voltage detection circuit detects that the output end voltage of the electromagnetic interference filter module 200 is greater than a threshold value, the switch tube is turned on to release the surge voltage to the ground; the discharge module 300 may also be an implementation method including a transient suppression diode and other devices that can release electrical energy to the ground when the voltage is greater than a threshold value.

[0040] refer to Figure 1In some embodiments of the surge protection circuit of the utility model, the varistor 320 includes a first varistor 321 and a second varistor 322, one end of the first varistor 321 is connected to the first output end of the electromagnetic interference filter module 200, one end of the second varistor 322 is connected to the second output end of the electromagnetic interference filter module 200, and one end of the first discharge tube 310 is respectively connected to the other end of the first varistor 321 and the other end of the second varistor 322.

[0041] When the output terminal voltage of the electromagnetic interference filter module 200 is an AC voltage, the first discharge tube 310 is connected to the first output terminal of the electromagnetic interference filter module 200 through the first varistor 321 and is connected to the second output terminal of the electromagnetic interference filter module 200 through the second varistor 322, so that when the output voltage of one of the first output terminal and the second output terminal of the electromagnetic interference filter module 200 is greater than the threshold, it will trigger the release of electric energy to the ground, which is beneficial to improving the reliability of the circuit.

[0042] In some embodiments of the present invention, when the output voltage of the electromagnetic interference filter module 200 is a DC voltage, the varistor unit 320 may also include an implementation of a single varistor, and the first discharge tube 310 is connected to the positive output terminal of the electromagnetic interference filter module 200 through the varistor; in a low-voltage application environment, the varistor unit 320 may also be an implementation including a transient suppression diode.

[0043] refer to Figure 1 In some embodiments of the surge protection circuit of the utility model, a surge discharge module 400 is also included. The electromagnetic interference filtering module 200 includes a common-mode inductor 210. The input end of the common-mode inductor 210 is connected to the power supply connection module 100, and the output end of the common-mode inductor 210 is connected to the discharge module 300. The surge discharge module 400 is connected to the common-mode inductor 210. The surge discharge module 400 is used to conduct the input end of the common-mode inductor 210 and the output end of the common-mode inductor 210 when the voltage of the common-mode inductor 210 is greater than a threshold value.

[0044] The common-mode inductor 210 can suppress the common-mode electromagnetic interference and realize the function of EMI filtering. The surge discharge module 400 is connected to the common-mode inductor 210. When the voltage of the common-mode inductor 210 is greater than the threshold, that is, when a surge voltage occurs, the surge discharge module 400 turns on the input and output ends of the common-mode inductor 210, which is equivalent to short-circuiting the two ends of the common-mode inductor 210. This can prevent the common-mode inductor 210 and other capacitors from further amplifying the surge voltage due to LC oscillation, and prevent the formation of a larger surge voltage. The subsequent surge voltage is released to the ground through the discharge module 300. In this way, the structure in which the surge discharge module 400 is connected to the common-mode inductor 210 can avoid the situation of resonant amplification of the surge voltage, which is conducive to improving safety. At the same time, the surge discharge module 400 is also conducive to protecting the common-mode inductor 210, avoiding excessive voltage and excessive current, which causes the common-mode inductor 210 to have magnetic saturation problems, which is conducive to improving reliability.

[0045] It can be understood that the threshold of the discharge module 300 and the threshold of the surge relief module 400 may be the same or different.

[0046] refer to Figure 1 In some embodiments of the surge protection circuit of the utility model, the common mode inductor 210 includes a coupled first coil and a second coil, the surge discharge module 400 includes a second discharge tube 410 and a third discharge tube 420, one end of the first coil and one end of the second coil are both connected to the power supply connection module 100, the other end of the first coil and the other end of the second coil are both connected to the discharge module 300, the second discharge tube 410 is connected in parallel with the first coil, and the third discharge tube 420 is connected in parallel with the second coil.

[0047] The second discharge tube 410 and the third discharge tube 420 are respectively connected in parallel with the first coil and the second coil of the common mode inductor 210, so that when the voltage at both ends of the first coil is greater than the conduction voltage of the second discharge tube 410 and the voltage at both ends of the second coil is greater than the conduction voltage of the third discharge tube 420, the second discharge tube 410 and the third discharge tube 420 are turned on, so as to achieve the function of short-circuiting both ends of the first coil and short-circuiting both ends of the second coil. The structure is simple and easy to implement.

[0048] It is understandable that when the surge discharge module 400 is triggered, the discharge module 300 is also triggered to release the surge voltage to the ground.

[0049] In some embodiments of the present invention, in a low voltage environment, the surge relief module 400 may also be implemented by including a transient suppression diode.

[0050] refer to Figure 1In some embodiments of the surge protection circuit of the utility model, the electromagnetic interference filtering module 200 also includes a first differential mode capacitor CX61, a second differential mode capacitor CX62, a first common mode capacitor CY62, a second common mode capacitor CY61 and a grounding resistor R64, one end of the first differential mode capacitor CX61 is connected to the first input end of the common mode inductor 210, the other end of the first differential mode capacitor CX61 is connected to the second input end of the common mode inductor 210, one end of the second differential mode capacitor CX62 is connected to the first output end of the common mode inductor 210, the other end of the second differential mode capacitor CX62 is connected to the second output end of the common mode inductor 210, one end of the first common mode capacitor CY62 is connected to the first output end of the common mode inductor 210, one end of the second common mode capacitor CY61 is connected to the second output end of the common mode inductor 210, the other end of the first common mode capacitor CY62 and the other end of the second common mode capacitor CY61 are both connected to one end of the grounding resistor R64, and the other end of the grounding resistor R64 is grounded.

[0051] The first differential mode capacitor CX61 is located before the input end of the common mode inductor 210 to filter the differential mode electromagnetic interference, and the second differential mode capacitor CX62 is located after the output end of the common mode inductor 210 to filter the differential mode electromagnetic interference. After the common mode inductor 210 filters the common mode electromagnetic interference, the first common mode capacitor CY62 and the second common mode capacitor CY61 further filter the common mode electromagnetic interference. In this way, both the differential mode electromagnetic interference and the common mode electromagnetic interference are filtered twice, which is beneficial to reduce the influence of the differential mode electromagnetic interference and the common mode electromagnetic interference on the circuit components of the rear end load and improve the reliability of the circuit.

[0052] It can be understood that the first input terminal and the first output terminal of the common-mode inductor 210 correspond to the two ends of the first coil, and the second input terminal and the second output terminal of the common-mode inductor 210 correspond to the two ends of the second coil.

[0053] refer to Figure 1 In some embodiments of the surge protection circuit of the utility model, the power supply connection module 100 includes a power supply connection terminal 110, a fuse 120 and a differential mode varistor 130, the first connection end of the power supply connection terminal 110 is connected to one end of the fuse 120, the other end of the fuse 120 is respectively connected to one end of the differential mode varistor 130 and the first input end of the electromagnetic interference filtering module 200, and the second connection end of the power supply connection terminal 110 is respectively connected to the other end of the differential mode varistor 130 and the second input end of the electromagnetic interference filtering module 200.

[0054] The power connection terminal 110 is connected to a power supply, such as a mains, a generator, a battery, etc. The fuse 120 can be blown when the current is too large to prevent safety problems caused by the excessive current. The differential mode varistor 130 plays the role of overvoltage protection to prevent excessive input voltage caused by thunder and other situations. The fuse 120 and the differential mode varistor 130 can protect the back-end circuit components and improve the safety of the circuit.

[0055] In some embodiments of the present invention, the power supply connection module 100 may also include implementations of devices such as a resettable fuse and a transient voltage suppressor diode.

[0056] refer to Figure 1 In some embodiments of the surge protection circuit of the present invention, an energy release module 500 is further included which is connected to the electromagnetic interference filter module 200. The energy release module 500 is used to release the energy stored in the electromagnetic interference filter module 200 when power is off.

[0057] Since the electromagnetic interference filter module 200 includes energy storage devices such as inductors and capacitors, by setting up an energy release module 500, the energy storage devices in the electromagnetic interference filter module 200 can release the stored energy through the energy release module 500 after power failure, thereby preventing the circuit from being in a charged state after power failure, which is beneficial to improving the safety of the circuit.

[0058] In some embodiments of the present invention, the energy release module 500 may include at least one implementation of an energy release resistor, which is connected to the input or output end of the electromagnetic interference filter module 200 so that the electromagnetic interference filter module 200 and the energy release resistor form a loop after power failure, and the energy release resistor consumes electrical energy.

[0059] refer to Figure 1 In some embodiments of the present invention, there are three energy release resistors, namely resistor R61, resistor R62 and resistor R63. Resistors R61, R62 and R63 are connected in series to form a series circuit. One end of the series circuit is connected to the first input end of the electromagnetic interference filter module 200, and the other end of the series circuit is connected to the second input end of the electromagnetic interference filter module 200.

[0060] refer to Figure 2 and Figure 3 The utility model also provides a refrigerator, including a body, the body is provided with the above-mentioned surge protection circuit, the body is also provided with a rectifier circuit 600, an inverter circuit 700 and a compressor load module 800, the output end of the electromagnetic interference filter module 200 is connected to the input end of the rectifier circuit 600, the output end of the rectifier circuit 600 is connected to the input end of the inverter circuit 700, and the output end of the inverter circuit 700 is connected to the compressor load module 800.

[0061] The anti-surge circuit provided by the utility model is arranged in the body of the refrigerator, and the electromagnetic interference filter module 200 can reduce the influence of electromagnetic interference on the rectifier circuit 600, the inverter circuit 700 and the compressor load module 800, so that the circuit working state is more stable. At the same time, by connecting the discharge module 300 to the output end of the electromagnetic interference filter module 200, the surge voltage can be released to the ground after the electromagnetic interference filtering when the electromagnetic interference filter module 200 is arranged, so as to avoid the surge voltage being resonantly amplified to cause damage to the circuit components at the rear end and the breakdown problem caused by the excessive voltage, which is conducive to improving the reliability and safety of the refrigerator.

[0062] The utility model also provides electrical equipment, comprising an equipment body, wherein the equipment body is provided with the above-mentioned anti-surge circuit.

[0063] The electrical equipment is provided with the anti-surge circuit provided by the utility model in the equipment body, and electric energy is obtained through the anti-surge circuit and transmitted to the load, wherein the electromagnetic interference filtering module 200 can reduce the influence of electromagnetic interference on the circuit components of the rear-end load, making the circuit working state more stable. At the same time, by connecting the discharge module 300 to the output end of the electromagnetic interference filtering module 200, when the electromagnetic interference filtering module 200 is provided, the surge voltage can be released to the ground after the electromagnetic interference filtering, so as to avoid the surge voltage being resonantly amplified to cause damage to the rear-end circuit components and the breakdown problem caused by excessive voltage, which is beneficial to improving the reliability and safety of the electrical equipment.

[0064] The electrical equipment may specifically be air conditioners, washing machines and other electrical equipment.

[0065] Finally, it should be noted that the above implementation modes are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. Anti-surge circuit, characterized in that, include: Power supply connection module; An electromagnetic interference filtering module, wherein the input end of the electromagnetic interference filtering module is connected to the power supply connection module, and the output end of the electromagnetic interference filtering module is used to be connected to a load; A discharge module is connected to the output end of the electromagnetic interference filter module, the discharge module is grounded, and is used to release a voltage greater than a threshold to the ground.

2. The surge protection circuit according to claim 1, characterized in that: The discharge module includes a first discharge tube and a pressure-sensitive unit. The pressure-sensitive unit is connected to the output end of the electromagnetic interference filter module. One end of the first discharge tube is connected to the pressure-sensitive unit, and the other end of the first discharge tube is grounded.

3. The surge protection circuit according to claim 2, characterized in that: The varistor includes a first varistor and a second varistor, one end of the first varistor is connected to the first output end of the electromagnetic interference filtering module, one end of the second varistor is connected to the second output end of the electromagnetic interference filtering module, and one end of the first discharge tube is respectively connected to the other end of the first varistor and the other end of the second varistor.

4. The surge protection circuit according to claim 1, characterized in that: It also includes a surge discharge module, the electromagnetic interference filtering module includes a common-mode inductor, the input end of the common-mode inductor is connected to the power supply connection module, the output end of the common-mode inductor is connected to the discharge module, and the surge discharge module is connected to the common-mode inductor. The surge discharge module is used to conduct the input end of the common-mode inductor and the output end of the common-mode inductor when the voltage of the common-mode inductor is greater than a threshold.

5. The surge protection circuit according to claim 4, characterized in that: The common mode inductor includes a coupled first coil and a second coil, the surge discharge module includes a second discharge tube and a third discharge tube, one end of the first coil and one end of the second coil are both connected to the power supply connection module, the other end of the first coil and the other end of the second coil are both connected to the discharge module, the second discharge tube is connected in parallel with the first coil, and the third discharge tube is connected in parallel with the second coil.

6. The surge protection circuit according to claim 4, characterized in that: The electromagnetic interference filtering module also includes a first differential mode capacitor, a second differential mode capacitor, a first common mode capacitor, a second common mode capacitor and a grounding resistor, one end of the first differential mode capacitor is connected to the first input end of the common mode inductor, the other end of the first differential mode capacitor is connected to the second input end of the common mode inductor, one end of the second differential mode capacitor is connected to the first output end of the common mode inductor, the other end of the second differential mode capacitor is connected to the second output end of the common mode inductor, one end of the first common mode capacitor is connected to the first output end of the common mode inductor, one end of the second common mode capacitor is connected to the second output end of the common mode inductor, the other end of the first common mode capacitor and the other end of the second common mode capacitor are both connected to one end of the grounding resistor, and the other end of the grounding resistor is grounded.

7. The surge protection circuit according to claim 1, characterized in that: The power supply connection module includes a power connection terminal, a fuse and a differential mode varistor, the first connection end of the power connection terminal is connected to one end of the fuse, the other end of the fuse is respectively connected to one end of the differential mode varistor and the first input end of the electromagnetic interference filtering module, and the second connection end of the power connection terminal is respectively connected to the other end of the differential mode varistor and the second input end of the electromagnetic interference filtering module.

8. The surge protection circuit according to claim 1, characterized in that: It also includes an energy release module connected to the electromagnetic interference filter module, and the energy release module is used to release the energy stored in the electromagnetic interference filter module when power is off.

9. A refrigerator, characterized in that: The invention comprises a body, wherein the body is provided with the surge protection circuit as claimed in any one of claims 1 to 8, and the body is also provided with a rectifier circuit, an inverter circuit and a compressor load module, wherein the output end of the electromagnetic interference filter module is connected to the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the input end of the inverter circuit, and the output end of the inverter circuit is connected to the compressor load module.

10. Electrical equipment, characterized in that: The device comprises a device body, wherein the device body is provided with the surge protection circuit according to any one of claims 1 to 8.

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