Electroless surge suppression circuit, refrigerator and electrical appliance

Abstract

The utility model relates to the technical field of surge suppression circuit provides electrolysis -free surge suppression circuit, refrigerator and electrical equipment, wherein the circuit includes: filter module, filter module's input end is used for with power supply connection, first surge suppression module is connected with filter module's output, rectification output module includes rectification unit and film capacitor, film capacitor is connected in parallel with rectification unit's output, rectification unit's input end is connected with first surge suppression module, rectification unit's output is used for with load connection, wherein, first surge suppression module is used for when the output voltage of filter module is greater than threshold value, reduces resistance to absorb energy. Rectification output module adopts the structure of film capacitor, and film capacitor brings long life, stability and so on advantage, through first surge suppression module promotes the suppression ability to differential mode voltage surge, avoids the condition that film capacitor bears the voltage is too high and leads to damage to occur, strengthens the overall reliability and safety of circuit.

Description

Technical Field

[0001] This utility model relates to the field of surge suppression circuit technology, and in particular to electrolytic-free surge suppression circuits, refrigerators, and electrical appliances. Background Technology

[0002] In the field of motor control, electrolytic capacitor-free control technology simplifies the design of motor drive systems by reducing or completely eliminating reliance on electrolytic capacitors.

[0003] In the power supply circuits of electrical equipment, circuits based on film capacitors can reduce circuit size, improve service life and reliability, and their small capacitance value increases the coupling between the mains and bus terminals, thus improving the power factor. However, electrical equipment commonly uses mains power or other power supplies, and voltage surges are unavoidable due to interference and fluctuations. Because film capacitors have small capacitance values ​​and low equivalent internal resistance, their ability to suppress differential-mode voltage surges is poor. Therefore, in circuits using film capacitors, there is a problem of differential-mode voltage surges causing excessively high voltages that can damage the film capacitors with low voltage withstand capability. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in related technologies. To this end, this invention proposes an electrolytic-free surge suppression circuit, which improves voltage surge suppression capability in a thin-film capacitor-based circuit.

[0005] This utility model also proposes a refrigerator and electrical appliances.

[0006] According to a first aspect embodiment of the present invention, the electrolytic-free surge suppression circuit includes: A filtering module, wherein the input terminal of the filtering module is used to connect to the power supply; The first surge suppression module is connected to the output terminal of the filter module; The rectifier output module includes a rectifier unit and a thin-film capacitor. The input terminal of the rectifier unit is connected to the first surge suppression module. The thin-film capacitor is connected in parallel with the output terminal of the rectifier unit. The output terminal of the rectifier unit is used to connect to the load. The first surge suppression module is used to reduce the resistance to absorb energy when the output voltage of the filter module is greater than a threshold.

[0007] The electrolytic-free surge suppression circuit according to this utility model embodiment has at least the following beneficial effects: the filter module obtains the voltage from the power supply and filters it to stabilize the voltage. After rectification by the rectifier unit in the rectifier output module and filtering and stabilizing by the film capacitor, a suitable voltage for the load is formed to meet the load's power demand. The first surge suppression module, based on the voltage of the filter module, and when the voltage of the filter module exceeds a threshold, reduces its own resistance, thereby increasing the current flowing through it, achieving the function of absorbing energy, limiting the voltage peak rise, achieving voltage clamping, and preventing voltage surges from being transmitted to the output of the subsequent rectifier unit. This helps to reduce the voltage of the film capacitor in the rectifier output module, avoiding damage to the film capacitor due to excessive voltage, while ensuring a stable and safe voltage output to the load, avoiding damage to differential voltage withstand devices. Therefore, based on the structure of the thin film capacitor used in the rectifier output module, the first surge suppression module improves the ability to suppress differential mode voltage surges, which is based on the advantages of thin film capacitors such as long life and high stability. This avoids the situation where the voltage of the thin film capacitor is too high, thereby reducing the circuit size while enhancing the overall reliability and safety of the circuit.

[0008] According to one embodiment of the present invention, the first surge suppression module includes a first varistor and a negative temperature coefficient thermistor. One end of the first varistor is connected to the first output terminal of the filter module and one end of the negative temperature coefficient thermistor, respectively. The other end of the negative temperature coefficient thermistor is connected to the first input terminal of the rectifier unit, and the other end of the first varistor is connected to the second output terminal of the filter module and the second input terminal of the rectifier unit, respectively.

[0009] According to one embodiment of the present invention, a second surge suppression module is included. The second surge suppression module is connected to the output terminal of the rectifier unit. The second surge suppression module is used to absorb energy when the output voltage of the rectifier unit is greater than a threshold.

[0010] According to one embodiment of the present invention, the second surge suppression module includes a transient suppression diode, which is connected in parallel with the output terminal of the rectifier unit.

[0011] According to one embodiment of the present invention, the filtering module includes a common-mode inductor, a first safety capacitor, and a second safety capacitor. The input terminal of the common-mode inductor is connected to the power supply. The first safety capacitor is connected in parallel with the input terminal of the common-mode inductor. The output terminal of the common-mode inductor is connected to the first surge suppression module. The second safety capacitor is connected in parallel with the output terminal of the common-mode inductor.

[0012] According to one embodiment of the present invention, the filtering module further includes a first capacitor, a second capacitor, a third capacitor, and a grounding resistor. One end of the first capacitor is connected to the first output terminal of the common-mode inductor, one end of the second safety capacitor, and the first surge suppression module. The other end of the first capacitor is connected to one end of the second capacitor, one end of the third capacitor, and one end of the grounding resistor. The other end of the second capacitor is connected to the second output terminal of the common-mode inductor, the other end of the second safety capacitor, and the first surge suppression module. The other end of the third capacitor is connected to the output terminal of the rectifier unit. The other end of the grounding resistor is grounded.

[0013] According to one embodiment of the present invention, a discharge module is further included, which is connected to the filter module and is used to release the energy stored in the filter module when the power is off.

[0014] According to one embodiment of the present invention, it further includes a fuse and a second varistor. One end of the fuse is connected to one end of the second varistor and the first input terminal of the filter module, respectively. The other end of the second varistor is connected to the second input terminal of the filter module. The other end of the fuse and the other end of the second varistor are used to connect to the power supply.

[0015] A refrigerator according to a second aspect of the present invention includes a body, the body being provided with the aforementioned electrolytic surge suppression circuit, the body also being provided with a frequency converter drive circuit and a compressor load module, the output terminal of the rectifier output module being connected to the input terminal of the frequency converter drive circuit, and the output terminal of the frequency converter drive circuit being connected to the compressor load module.

[0016] An electrical device according to a third aspect of the present invention includes a device body, wherein the device body is provided with the above-mentioned electrolytic surge suppression circuit.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This is a circuit diagram of one embodiment of the electrolytic-free surge suppression circuit provided in this utility model.

[0020] Figure 2 This is a schematic diagram of the structural frame of one embodiment of the refrigerator provided in this utility model.

[0021] Figure label: 100: Filtering module; 200: First surge suppression module; 300: Rectifier output module; 310: Rectifier unit; 320: Thin film capacitor; 400: Second surge suppression module; 500: Discharge module; 600: Fuse; 700: Second varistor; 800: Variable frequency drive circuit; 900: Compressor load module. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0025] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0027] refer to Figure 1 This utility model provides an electrolysis-free surge suppression circuit, comprising: A filter module 100, the input terminal of which is used to connect to a power supply; The first surge suppression module 200 is connected to the output terminal of the filter module 100; The rectifier output module 300 includes a rectifier unit 310 and a thin film capacitor 320. The input terminal of the rectifier unit 310 is connected to the first surge suppression module 200. The thin film capacitor 320 is connected in parallel with the output terminal of the rectifier unit 310. The output terminal of the rectifier unit 310 is used to connect to the load. The first surge suppression module 200 is used to reduce the resistance to absorb energy when the output voltage of the filter module 100 is greater than a threshold.

[0028] The filter module 100 obtains the voltage from the power supply and filters it to stabilize the voltage. After rectification by the rectifier unit 310 in the rectifier output module 300 and filtering and stabilizing by the film capacitor 320, a suitable voltage for the load is formed to meet the load's power requirements. The first surge suppression module 200, based on the voltage from the filter module 100, reduces its own resistance when the voltage of the filter module 100 exceeds a threshold, thereby increasing the current flowing through it. This absorbs energy, limits the voltage peak rise, and achieves voltage clamping, preventing voltage surges from being transmitted to the output of the subsequent rectifier unit 310. This helps reduce the voltage of the film capacitor 320 in the rectifier output module 300, preventing damage to the film capacitor 320 due to excessive voltage. Simultaneously, it ensures a stable and safe voltage output to the load, avoiding damage to differential voltage withstand devices.

[0029] Therefore, based on the structure of the thin film capacitor 320 used in the rectifier output module 300, the first surge suppression module 200 improves the ability to suppress differential mode voltage surges, which is based on the advantages of the thin film capacitor 320 such as long life and high stability. This avoids the situation where the voltage of the thin film capacitor 320 is too high, thereby reducing the circuit size while enhancing the overall reliability and safety of the circuit.

[0030] The use of a 320 film capacitor structure significantly improves lifespan and reliability compared to electrolytic capacitors. In applications where lifespan and stability requirements are high, such as household appliances like refrigerators, this reduces the likelihood of circuit repairs and replacements, thus enhancing the durability of the appliances.

[0031] In some embodiments of the present invention, reference is made to Figure 1 The rectifier unit 310 may include an embodiment of a rectifier bridge BR1 based on diodes. In some embodiments, the rectifier unit 310 may also include an embodiment of an active rectifier circuit or other circuit with rectification function based on switching transistors.

[0032] In some embodiments of this utility model, an inverter can be connected after the rectifier output module 300 to further process the voltage and current of the power supply before supplying power to the load.

[0033] refer to Figure 1In some embodiments of the electrolytic-free surge suppression circuit provided by this utility model, the first surge suppression module 200 includes a first varistor ZR3 and a negative temperature coefficient thermistor NTC1. One end of the first varistor ZR3 is connected to the first output terminal of the filter module 100 and one end of the negative temperature coefficient thermistor NTC1, respectively. The other end of the negative temperature coefficient thermistor NTC1 is connected to the first input terminal of the rectifier unit 310, and the other end of the first varistor ZR3 is connected to the second output terminal of the filter module 100 and the second input terminal of the rectifier unit 310, respectively.

[0034] When the voltage of the filter module 100 exceeds the threshold due to differential-mode voltage surges, the first varistor ZR3 absorbs the surge energy and limits the rise of the voltage peak due to the reduced resistance of its varistor characteristic. Simultaneously, the first varistor ZR3 also suppresses the LC resonant voltage that may occur in the filter module 100, clamping the voltage within its withstand range. The resistance of the negative temperature coefficient thermistor NTC1 decreases with increasing temperature. Connected between the first varistor ZR3 and the first input terminal of the rectifier output module 300, NTC1 acts as a decoupling agent, forcing the first varistor ZR3 to trigger first and absorb part of the differential-mode voltage surge energy when a surge occurs. Thus, through the structure of the first varistor ZR3 and the negative temperature coefficient thermistor NTC1, surge energy is effectively absorbed, thereby reducing the voltage of the film capacitor 320 and preventing damage due to excessive voltage across the film capacitor 320 caused by the surge, achieving the effect of surge suppression.

[0035] refer to Figure 1 In some embodiments of the electrolysis-free surge suppression circuit provided by this utility model, a second surge suppression module 400 is also included. The second surge suppression module 400 is connected to the output terminal of the rectifier unit 310. The second surge suppression module 400 is used to absorb energy when the output voltage of the rectifier unit 310 is greater than a threshold.

[0036] When the output voltage of the rectifier unit 310 exceeds the threshold due to residual differential mode voltage surge or other interference, the second surge suppression module 400 absorbs the excess energy, thereby limiting the magnitude of the output voltage and preventing the film capacitor 320 connected in parallel with the output terminal of the rectifier unit 310 from experiencing excessive voltage, thus avoiding damage to the film capacitor 320. In this way, the second surge suppression module 400 further enhances the circuit's ability to suppress voltage surges, helping to ensure that the voltage across the film capacitor 320 remains within its withstand voltage range, protecting the film capacitor 320 from damage, and enhancing the overall reliability and safety of the circuit.

[0037] It should be noted that the first surge suppression module 200 performs primary suppression of differential mode surges on the input side of the rectifier unit 310, while the second surge suppression module 400 performs secondary suppression of residual surges on the output side of the rectifier unit 310, forming a two-level protection system, which helps to ensure that surge energy is effectively absorbed on both the input and output sides of the rectifier unit 310.

[0038] refer to Figure 1 In some embodiments of the electrolytic-free surge suppression circuit provided by this utility model, the second surge suppression module 400 includes a transient suppression diode TVS1, which is connected in parallel with the output terminal of the rectifier unit 310.

[0039] When the output voltage of the rectifier output module 300 exceeds the breakdown voltage (i.e., the voltage exceeds the threshold voltage), the transient voltage suppressor diode TVS1 quickly breaks down to discharge surge energy, clamping the voltage to a safe level. This protects the film capacitor 320 from excessive voltage and also protects the downstream load circuit, thereby further improving the voltage surge suppression effect.

[0040] refer to Figure 1 In some embodiments of the electrolytic-free surge suppression circuit provided by this utility model, the filter module 100 includes a common-mode inductor L2, a first safety capacitor CX2, and a second safety capacitor CX1. The input terminal of the common-mode inductor L2 is connected to the power supply. The first safety capacitor CX2 is connected in parallel with the input terminal of the common-mode inductor L2. The output terminal of the common-mode inductor L2 is connected to the first surge suppression module 200. The second safety capacitor CX1 is connected in parallel with the output terminal of the common-mode inductor L2.

[0041] The input terminal of the common-mode inductor L2 is connected to the power supply to suppress common-mode interference noise. The first safety capacitor CX2 is connected in parallel with the input terminal of the common-mode inductor L2 to filter and absorb the input differential-mode interference noise. The second safety capacitor CX1 is connected in parallel with the output terminal of the common-mode inductor L2 to further filter and suppress the differential-mode interference noise at the output terminal.

[0042] Therefore, by forming a Π-type filter through the common-mode inductor L2, the first safety capacitor CX2, and the second safety capacitor CX1, common-mode interference noise and differential-mode interference noise can be suppressed, enhancing the stability of the input voltage and the ability to suppress interference noise. At the same time, it also has a certain suppression effect on differential-mode surges, reducing the surge transmission to the first surge suppression module 200, thereby assisting the first surge suppression module 200 to more effectively suppress voltage surges, ensuring that the rectifier output module 300 provides a stable and safe voltage output to the load, and avoiding damage to the differential voltage withstand device.

[0043] refer to Figure 1In some embodiments of the electrolytic-free surge suppression circuit provided by this utility model, the filter module 100 further includes a first capacitor C2, a second capacitor C3, a third capacitor C1, and a grounding resistor RE1. One end of the first capacitor C2 is connected to the first output terminal of the common-mode inductor L2, one end of the second safety capacitor CX1, and the first surge suppression module 200. The other end of the first capacitor C2 is connected to one end of the second capacitor C3, one end of the third capacitor C1, and one end of the grounding resistor RE1. The other end of the second capacitor C3 is connected to the second output terminal of the common-mode inductor L2, the other end of the second safety capacitor CX1, and the first surge suppression module 200. The other end of the third capacitor C1 is connected to the output terminal of the rectifier unit 310. The other end of the grounding resistor RE1 is grounded.

[0044] The first capacitor C2 and the second capacitor C3 are connected between the output terminal of the common-mode inductor L2 and the first surge suppression module 200, respectively. A grounding resistor RE1 is connected between the common point of the capacitors and ground, providing a safe discharge path. This allows the first capacitor C2 and the second capacitor C3 to simultaneously filter out both differential-mode and common-mode interference noise to ground, further suppressing differential-mode interference noise, suppressing common-mode interference noise, and stabilizing voltage fluctuations. The third capacitor C1 is connected to the output terminal of the rectifier output module 300 and is also grounded through the grounding resistor RE1 to filter out differential-mode interference noise present in the rectifier output module 300 and suppress residual surges. Thus, the filtering effect is further improved through the first capacitor C2, the second capacitor C3, the third capacitor C1, and the grounding resistor RE1, which helps to make the voltage more stable.

[0045] refer to Figure 1 In some embodiments of the electrolytic surge suppression circuit provided by this utility model, a discharge module 500 is also included. The discharge module 500 is connected to the filter module 100 and is used to release the energy stored in the filter module 100 when the power is off.

[0046] Since the filter module 100 includes energy storage devices such as inductors and capacitors, by setting up a discharge module 500, the energy storage devices of the filter module 100 can release the stored energy through the discharge module 500 after the power is turned off, thus preventing the circuit from remaining in a charged state after the power is turned off, which is beneficial to improving the safety of the circuit.

[0047] The discharge module 500 can also release the stored energy of the film capacitor 320 after power is cut off.

[0048] In some embodiments of this utility model, the discharge module 500 may include at least one energy-releasing resistor, which is connected to the input or output terminal of the filter module 100 so that the filter module 100 and the energy-releasing resistor form a circuit after power failure, and the energy-releasing resistor consumes electrical energy.

[0049] refer to Figure 1 In some embodiments of this utility model, there are three energy-releasing resistors, namely resistor R5, resistor R9 and resistor R15. Resistors R5, R9 and R15 are connected in series to form a series circuit. One end of the series circuit is connected to the first input terminal of the filter module 100, and the other end of the series circuit is connected to the second input terminal of the filter module 100.

[0050] refer to Figure 1 In some embodiments of the electrolytic-free surge suppression circuit provided by this utility model, a fuse 600 and a second varistor 700 are also included. One end of the fuse 600 is connected to one end of the second varistor 700 and the first input terminal of the filter module 100, respectively. The other end of the second varistor 700 is connected to the second input terminal of the filter module 100. The other end of the fuse 600 and the other end of the second varistor 700 are used to connect to the power supply.

[0051] When the voltage of the power supply is too high, exceeding the threshold of the second varistor 700, the resistance of the second varistor 700 decreases, causing the current flowing through the fuse 600 to increase, thereby causing the fuse 600 to melt and disconnect from the power supply. This prevents excessive input voltage caused by lightning strikes or other events, protecting downstream circuit components and improving circuit safety.

[0052] refer to Figure 1 and Figure 2 The present invention also provides a refrigerator, including a body, wherein the body is provided with the above-mentioned electrolytic surge suppression circuit, the body is also provided with a frequency converter drive circuit 800 and a compressor load module 900, the output terminal of the rectifier output module 300 is connected to the input terminal of the frequency converter drive circuit 800, and the output terminal of the frequency converter drive circuit 800 is connected to the compressor load module 900.

[0053] The refrigerator body is equipped with the electrolytic surge suppression circuit provided by this utility model. The filter module 100 obtains the voltage of the power supply and filters it to stabilize the voltage. After rectification by the rectifier unit 310 in the rectifier output module 300 and filtering and stabilizing by the film capacitor 320, it is output to the frequency conversion drive circuit 800, thereby driving the compressor load module 900 to work.

[0054] The first surge suppression module 200, based on the voltage of the filter module 100, reduces its own resistance when the voltage of the filter module 100 exceeds a threshold, thereby increasing the current flowing through itself. This absorbs energy, limits the rise of the voltage peak, and achieves voltage clamping, preventing the voltage surge from being transmitted to the output of the subsequent rectifier unit 310. This also helps to reduce the voltage of the film capacitor 320 in the rectifier output module 300, preventing the film capacitor 320 from being damaged due to excessive voltage. At the same time, it ensures a stable and safe voltage output to the load, avoiding damage to the differential voltage withstand device.

[0055] Therefore, based on the structure of the thin film capacitor 320 used in the rectifier output module 300, the first surge suppression module 200 improves the ability to suppress differential mode voltage surges, which is based on the advantages of the thin film capacitor 320 such as long life and high stability. This avoids the situation where the voltage of the thin film capacitor 320 is too high, thereby reducing the circuit size while enhancing the overall reliability and safety of the circuit.

[0056] This utility model also provides an electrical device, including a device body, wherein the device body is provided with the above-mentioned electrolysis-free surge suppression circuit.

[0057] The refrigerator body incorporates the electrolytic-free surge suppression circuit provided by this invention. The voltage from the power supply is obtained through a filter module 100 and filtered to stabilize the voltage. After rectification by the rectifier unit 310 in the rectifier output module 300 and further regulated by the film capacitor 320, a suitable voltage for the load is formed to meet the load's power requirements. The first surge suppression module 200, based on the voltage from the filter module 100, reduces its own resistance when the voltage exceeds a threshold, thereby increasing the current flowing through it. This absorbs energy, limits the voltage peak rise, and achieves voltage clamping, preventing the voltage surge from being transmitted to the output of the subsequent rectifier unit 310. This also helps reduce the voltage of the film capacitor 320 in the rectifier output module 300, preventing damage to the film capacitor 320 due to excessive voltage. Simultaneously, it ensures a stable and safe voltage output to the load, avoiding damage to differential voltage withstand devices. Therefore, based on the structure of the thin film capacitor 320 used in the rectifier output module 300, the first surge suppression module 200 improves the ability to suppress differential mode voltage surges, which is based on the advantages of the thin film capacitor 320 such as long life and high stability. This avoids the situation where the voltage of the thin film capacitor 320 is too high, thereby reducing the circuit size while enhancing the overall reliability and safety of the circuit.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions 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 covered within the scope of the claims of the present invention.

Claims

1. A surge suppression circuit without electrolysis, characterized in that, include: A filter module (100), the input terminal of which is used to connect to a power supply; The first surge suppression module (200) is connected to the output terminal of the filter module (100); The rectifier output module (300) includes a rectifier unit (310) and a thin film capacitor (320). The input terminal of the rectifier unit (310) is connected to the first surge suppression module (200). The thin film capacitor (320) is connected in parallel with the output terminal of the rectifier unit (310). The output terminal of the rectifier unit (310) is used to connect to the load. The first surge suppression module (200) is used to reduce the resistance to absorb energy when the output voltage of the filter module (100) is greater than a threshold.

2. The electrolysis-free surge suppression circuit according to claim 1, characterized in that, The first surge suppression module (200) includes a first varistor and a negative temperature coefficient thermistor. One end of the first varistor is connected to the first output terminal of the filter module (100) and one end of the negative temperature coefficient thermistor, respectively. The other end of the negative temperature coefficient thermistor is connected to the first input terminal of the rectifier unit (310), and the other end of the first varistor is connected to the second output terminal of the filter module (100) and the second input terminal of the rectifier unit (310), respectively.

3. The electrolysis-free surge suppression circuit according to claim 1, characterized in that, It also includes a second surge suppression module (400), which is connected to the output terminal of the rectifier unit (310). The second surge suppression module (400) is used to absorb energy when the output voltage of the rectifier unit (310) is greater than a threshold.

4. The electrolysis-free surge suppression circuit according to claim 3, characterized in that, The second surge suppression module (400) includes a transient suppression diode, which is connected in parallel with the output terminal of the rectifier unit (310).

5. The electrolysis-free surge suppression circuit according to claim 1, characterized in that, The filtering module (100) includes a common-mode inductor, a first safety capacitor, and a second safety capacitor. The input terminal of the common-mode inductor is connected to the power supply. The first safety capacitor is connected in parallel with the input terminal of the common-mode inductor. The output terminal of the common-mode inductor is connected to the first surge suppression module (200). The second safety capacitor is connected in parallel with the output terminal of the common-mode inductor.

6. The electrolysis-free surge suppression circuit according to claim 5, characterized in that, The filtering module (100) further includes a first capacitor, a second capacitor, a third capacitor, and a grounding resistor. One end of the first capacitor is connected to the first output terminal of the common-mode inductor, one end of the second safety capacitor, and the first surge suppression module (200). The other end of the first capacitor is connected to one end of the second capacitor, one end of the third capacitor, and one end of the grounding resistor. The other end of the second capacitor is connected to the second output terminal of the common-mode inductor, the other end of the second safety capacitor, and the first surge suppression module (200). The other end of the third capacitor is connected to the output terminal of the rectifier unit (310). The other end of the grounding resistor is grounded.

7. The electrolysis-free surge suppression circuit according to claim 1, characterized in that, It also includes a discharge module (500), which is connected to the filter module (100). The discharge module (500) is used to release the energy stored in the filter module (100) when the power is off.

8. The electrolysis-free surge suppression circuit according to claim 1, characterized in that, It also includes a fuse (600) and a second varistor (700). One end of the fuse (600) is connected to one end of the second varistor (700) and the first input terminal of the filter module (100). The other end of the second varistor (700) is connected to the second input terminal of the filter module (100). The other end of the fuse (600) and the other end of the second varistor (700) are used to connect to the power supply.

9. A refrigerator, characterized in that, The device includes a body, which is provided with an electrolytic surge suppression circuit as described in any one of claims 1 to 8. The body is also provided with a variable frequency drive circuit (800) and a compressor load module (900). The output terminal of the rectifier output module (300) is connected to the input terminal of the variable frequency drive circuit (800), and the output terminal of the variable frequency drive circuit (800) is connected to the compressor load module (900).

10. Electrical equipment, characterized in that, The device includes a device body, which is provided with an electrolytic-free surge suppression circuit as described in any one of claims 1 to 8.

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