Refrigeration equipment

Abstract

The utility model discloses refrigeration equipment, which comprises a variable frequency compressor, a power supply module and a control module, the driving circuit comprises a Y capacitor module and an inversion unit, the output end of the inversion unit is connected with the three-phase power supply terminal, one end of the Y capacitor module is coupled to the input end of the inversion unit, and the other end of the Y capacitor module is connected with the shell of the inverter compressor, so that a variable frequency interference signal backflow loop from the inversion unit and the shell of the inverter compressor to the Y capacitor module is formed. Compared with traditional refrigeration equipment, the frequency conversion interference backflow area can be reduced, and interference leakage is reduced.

Description

Technical Field

[0001] The utility model relates to the field of air conditioners, and particularly to a refrigeration device. Background Art

[0002] In electronic devices, Y capacitors are usually used to suppress electromagnetic interference (EMI), and their grounding methods are crucial for the normal operation and safety of the devices. Taking a refrigerator as an example, the grounding wire of the Y capacitor on the refrigerator inverter board is customarily routed out along the same path as the live wire and neutral wire in the power cord, and then connected to the refrigerator bottom plate. Moreover, the inverter output wire is connected to the compressor. There is an interfering signal current flowing through the grounding wire of the Y capacitor, thus forming an interfering signal return loop.

[0003] However, the area of the return loop of the current refrigerator drive circuit is very large. A larger return loop area means that the magnetic field change generated when the current changes is also larger, which may lead to stronger electromagnetic field radiation, thus interfering with the normal operation of other electronic devices, affecting the device performance, and affecting the normal operation of the compressor. Summary of the Utility Model

[0004] An embodiment of the utility model provides a refrigeration device, which can reduce the return area of the inverter interference and reduce the interference leakage.

[0005] In a first aspect, an embodiment of the utility model provides a refrigeration device, comprising:

[0006] A variable-frequency compressor, comprising three-phase power terminals;

[0007] A drive circuit, comprising a Y capacitor module and an inverter unit. The output end of the inverter unit is connected to the three-phase power terminals. One end of the Y capacitor module is coupled to the input end of the inverter unit, and the other end of the Y capacitor module is connected to the housing of the variable-frequency compressor to form a variable-frequency interference signal return loop from the inverter unit, the housing of the variable-frequency compressor to the Y capacitor module.

[0008] In some embodiments, the refrigeration device further comprises an outlet terminal, which is arranged on the circuit board of the drive circuit, and the inverter unit is connected to the variable-frequency compressor through the outlet terminal.

[0009] In some embodiments, the outlet terminal comprises a power terminal, and the power terminal is connected to the output end of the inverter unit and the three-phase power terminals through three terminals.

[0010] In some embodiments, the drive circuit further comprises a common-mode inductor and a rectifier bridge. The common-mode inductor, the rectifier bridge and the inverter unit are connected in sequence, and the Y capacitor module is coupled at the connection of the common-mode inductor and the rectifier bridge.

[0011] In some embodiments, the common mode inductor includes a first winding and a second winding, and the Y-capacitor module includes a first Y-capacitor, a second Y-capacitor, and a Y-capacitor ground wire; one end of the first Y-capacitor is connected to the connection point between the first winding and the rectifier bridge, and the other end is connected to the housing of the variable frequency compressor through the Y-capacitor ground wire. One end of the second Y-capacitor is connected to the connection point between the second winding and the rectifier bridge, and the other end is connected to the housing of the variable frequency compressor through the Y-capacitor ground wire.

[0012] In some embodiments, the Y-capacitor module further includes a Y-capacitor terminal. The Y-capacitor terminal is disposed on the circuit board of the drive circuit. Both the first Y-capacitor and the second Y-capacitor are connected to the Y-capacitor ground wire through the Y-capacitor terminal, and the Y-capacitor terminal and the Y-capacitor ground wire are fixed through a terminal fastener.

[0013] In some embodiments, the refrigeration device further includes a power cord and a device bottom plate. The ground wire of the power cord is connected to the device bottom plate, and the neutral wire and the live wire of the power cord are connected to the drive circuit through the common mode inductor.

[0014] In some embodiments, the refrigeration device further includes an incoming line terminal. The incoming line terminal is disposed on the circuit board of the drive circuit, and the incoming line terminal is connected to the neutral wire and the live wire of the power cord through two terminals.

[0015] In some embodiments, the variable frequency compressor includes a grounding terminal, and the grounding terminal is connected to the device bottom plate through a ground wire.

[0016] In some embodiments, one end of the first winding is connected to the live wire of the power cord, and the other end is connected to an input terminal of the rectifier bridge. One end of the second winding is connected to the neutral wire of the power cord, and the other end is connected to another input terminal of the rectifier bridge.

[0017] The refrigeration device according to the embodiment of the present utility model has at least the following beneficial effects: The refrigeration device of the present utility model includes a variable-frequency compressor and a drive circuit. The drive circuit includes a Y-capacitor module and an inverter unit. The output terminal of the inverter unit is connected to the three-phase power supply terminals of the variable-frequency compressor. One end of the Y-capacitor module is coupled to the input terminal of the inverter unit, and the other end of the Y-capacitor module is connected to the outer shell of the variable-frequency compressor, so as to form a variable-frequency interference signal return loop from the inverter unit, the outer shell of the variable-frequency compressor to the Y-capacitor module. Through the connection relationship between the variable-frequency compressor and each component in the drive circuit in the embodiment of the present application, a variable-frequency interference signal return loop of inverter unit - outer shell of variable-frequency compressor - Y-capacitor module - inverter unit can be formed, so as to reduce the return area of variable-frequency interference, further reduce interference leakage, and improve the rectification effect of electromagnetic interference.

[0018] Other features and advantages of the present utility model will be described in the following description. And, some of them will become obvious from the description, or be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a refrigeration device provided by an embodiment of the present utility model;

[0020] Figure 2 is a schematic diagram of a variable-frequency interference signal return loop provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model, and are not used to limit the present utility model. In addition, the features, operations or characteristics described in the description can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the various sequences in the description and the drawings are only for clearly describing a certain embodiment, and do not mean that they are necessary sequences, unless it is stated that a certain sequence must be followed.

[0022] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0023] The serial numbers assigned to the components in this article itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in the present utility model, unless otherwise specified, both include direct and indirect connection (coupling).

[0024] In an electronic device, Y capacitors are usually used to suppress electromagnetic interference (EMI), and their grounding method is crucial for the normal operation and safety of the device. Taking a refrigerator as an example, the grounding wire of the Y capacitor on the refrigerator inverter board is customarily routed out along the same path as the live wire and neutral wire in the power cord, and then connected to the refrigerator bottom plate, and the variable frequency output wire is connected to the compressor. The grounding wire of the Y capacitor has an interfering signal current flowing through it, thus forming an interfering signal return loop.

[0025] However, the area of the return loop of the current refrigerator drive circuit is very large. A larger return loop area means that the magnetic field change generated when the current changes is also larger, which may cause stronger electromagnetic field radiation, thereby interfering with the normal operation of other electronic devices, affecting the device performance, and affecting the normal operation of the compressor.

[0026] Based on this, the refrigeration device of the present utility model includes a variable frequency compressor and a drive circuit. The drive circuit includes a Y capacitor module and an inverter unit, and the output end of the inverter unit is connected to the three-phase power terminals of the variable frequency compressor. One end of the Y capacitor module is coupled to the input end of the inverter unit, and the other end of the Y capacitor module is connected to the housing of the variable frequency compressor, so as to be able to form a variable frequency interference signal return loop from the inverter unit, the housing of the variable frequency compressor to the Y capacitor module. Through the connection relationship of each component in the variable frequency compressor and the drive circuit in the embodiments of the present application, a variable frequency interference signal return loop of inverter unit - housing of variable frequency compressor - Y capacitor module - inverter unit can be formed, thereby being able to reduce the return area of variable frequency interference, further being able to reduce interference leakage, and improving the rectification effect of electromagnetic interference.

[0027] The refrigeration device will be described below with reference to the accompanying drawings:

[0028] Refer to Figure 1 as shown Figure 1 which is a schematic diagram of the architecture of a refrigeration device provided by an embodiment of the present utility model.

[0029] In some embodiments, the refrigeration device includes a variable-frequency compressor 100 and a drive circuit 200. Among them, the variable-frequency compressor 100 includes three-phase power terminals 110, such that the refrigeration device can be connected to the variable-frequency compressor 100 by connecting three-phase power lines, and through appropriate design and installation of the three-phase power terminals 110, the safety of the electrical connection can be ensured, preventing short circuits or electrical failures.

[0030] Referring to Figure 2 shown, Figure 2 is a schematic diagram of the variable-frequency interference signal return loop provided by an embodiment of the present utility model.

[0031] In some embodiments, the drive circuit 200 includes a Y-capacitor module and an inverter unit 210. The output end of the inverter unit 210 is connected to the three-phase power terminals 110. One end of the Y-capacitor module is coupled to the input end of the inverter unit 210, and the other end of the Y-capacitor module is connected to the housing of the variable-frequency compressor 100 to form a variable-frequency interference signal return loop from the inverter unit 210, the housing of the variable-frequency compressor 100 to the Y-capacitor module. Specifically, a variable-frequency interference signal return loop of the inverter unit 210 - the housing of the variable-frequency compressor 100 - the Y-capacitor module - the inverter unit 210 as shown in Figure 2 is formed, that is, the loop formed by the arrow direction in Figure 2 is formed. Compared with the area of the variable-frequency interference signal return loop formed in the related art, the area of the variable-frequency interference signal return loop formed in the embodiments of the present application is smaller, not easily radiating and leaking externally, and by reducing the area of the variable-frequency interference signal return loop, the radiation of electromagnetic waves can be reduced, the interference to surrounding electronic devices can be reduced, and further the electromagnetic interference rectification effect can be improved.

[0032] It can be understood that the refrigeration device in the embodiments of the present application can be refrigeration devices such as refrigerators, air conditioners, and freezers. The embodiments of the present application take the refrigeration device as a refrigerator as an example for illustration, and the inverter unit 210 can be a source inverter bridge. The source inverter bridge is usually used to convert direct current into alternating current, and the inverter bridge can provide electrical isolation to improve the safety of the system.

[0033] It should be noted that the Y-capacitor module in the embodiments of the present application is a type of safety capacitor module. Through the Y-capacitor module, the high-frequency noise on the power line can be short-circuited, thereby reducing the radiation interference of the power line to the outside, and providing safety isolation to prevent direct electrical connection between the main circuit and the secondary circuit.

[0034] In some embodiments, the refrigeration device further includes an outgoing line terminal 500. The outgoing line terminal 500 is disposed on the circuit board of the drive circuit 200. The inverter unit 210 is connected to the variable-frequency compressor 100 through the outgoing line terminal 500. Specifically, the inverter unit 210 is connected to the variable-frequency compressor 100 through the outgoing line terminal 500 and the three-phase power supply terminal 110.

[0035] It should be noted that the inverter unit 210 in the embodiments of the present application can be connected to the variable-frequency compressor 100 through a three-phase power line (UVW). At this time, the three-phase power supply terminal 110 can be a UVW terminal. Specifically, the U phase, V phase, and W phase in the three-phase power line respectively represent a voltage phase in the three-phase power, and the U phase, V phase, and W phase work together to form a three-phase power system.

[0036] In some embodiments, the drive circuit 200 further includes a common-mode inductor and a rectifier bridge 330. The common-mode inductor, the rectifier bridge 330, and the inverter unit 210 are connected in sequence, that is, the rectifier bridge 330 is respectively connected to the common-mode inductor and the inverter unit 210, and the Y-capacitor module is coupled at the connection between the common-mode inductor and the rectifier bridge 330, so as to be able to suppress electromagnetic interference through the Y-capacitor, provide safety protection, and reduce high-frequency noise in the drive circuit 200.

[0037] In some embodiments, the common-mode inductor includes a first winding 310 and a second winding 320. The Y-capacitor module includes a first Y-capacitor 410, a second Y-capacitor 420, and a Y-capacitor ground wire. One end of the first Y-capacitor 410 is connected to the connection point between the first winding 310 and the rectifier bridge 330, and the other end is connected to the housing of the variable-frequency compressor 100 through the Y-capacitor ground wire. One end of the second Y-capacitor 420 is connected to the connection point between the second winding 320 and the rectifier bridge 330, and the other end is connected to the housing of the variable-frequency compressor 100 through the Y-capacitor ground wire, so as to be able to suppress high-frequency noise on the high-frequency interference signal return loop through the first Y-capacitor 410 and the second Y-capacitor 420.

[0038] It should be noted that one end of the first Y-capacitor 410 and the second Y-capacitor 420 in the embodiments of the present application is connected to the same Y-capacitor ground wire, and the first Y-capacitor 410 is connected to the branch where the first winding 310 and the rectifier bridge 330 are provided, and the second Y-capacitor 420 is connected to the branch where the second winding 320 and the rectifier bridge 330 are provided.

[0039] In some embodiments, the outgoing line terminal 500 includes a power supply terminal 510. The power supply terminal 510 is connected to the output end of the inverter unit 210 and the three-phase power supply terminal 110 through three terminals, that is, the output end of the inverter unit 210 can be connected to the three-phase power supply terminal 110 through the three terminals in the power supply terminal 510, further enabling the connection between the inverter unit 210 and the variable-frequency compressor 100.

[0040] In some embodiments, the Y-capacitor module further includes a Y-capacitor terminal 520, which is disposed on the circuit board of the drive circuit 200. Both the first Y-capacitor 410 and the second Y-capacitor 420 are connected to the Y-capacitor ground wire through the Y-capacitor terminal 520, enabling the first Y-capacitor 410 and the second Y-capacitor 420 to be connected to the Y-capacitor ground wire. Moreover, the Y-capacitor terminal 520 and the Y-capacitor ground wire are fixed by a terminal fastener, thereby fixing the Y-capacitor ground wire and the Y-capacitor terminal 520. The terminal fastener can ensure a firm and reliable connection between the Y-capacitor and the Y-capacitor terminal 520, reducing poor contact caused by vibration or temperature changes.

[0041] It can be understood that using the terminal fastener in the embodiments of the present application can facilitate the replacement or maintenance of the Y-capacitor without the need for re-welding or complex disassembly. Additionally, it can prevent the Y-capacitor module from shifting or falling off due to vibration or external forces during the operation of the refrigeration equipment, thus avoiding short circuits or electrical failures.

[0042] In some embodiments, the variable-frequency compressor 100 further includes a Y-capacitor ground terminal 120, which is disposed on the outer shell of the variable-frequency compressor 100. The Y-capacitor ground wire is connected to the outer shell of the variable-frequency compressor 100 through the Y-capacitor ground terminal 120.

[0043] It should be noted that the variable-frequency compressor 100 in the embodiments of the present application further includes a stator winding 610. In the variable-frequency compressor 100, the stator winding 610 generates a rotating magnetic field through the flow of current. Due to factors such as the circuit board wiring and the gaps between components in the variable-frequency compressor 100, distributed capacitance is naturally generated, thereby reducing high-frequency noise on the power line or signal line, suppressing electromagnetic interference, and being able to absorb the spikes generated by voltage mutations in the circuit to protect the variable-frequency compressor 100 from voltage surges.

[0044] It is worth noting that the Y-capacitor terminal 520 and the power terminal 510 in the embodiments of the present application can be disposed at the same position on the circuit board of the drive circuit 200, that is, both the power terminal 510 and the Y-capacitor terminal 520 can be disposed on the outgoing line terminal 500. Figure 1 and Figure 2 Taking the power terminal 510 and the Y-capacitor terminal 520 being disposed on the outgoing line terminal 500 as an example for illustration. At this time, the Y-capacitor ground wire of the Y-capacitor module and the output terminal of the inverter unit 210 are out of the same terminal, that is, both the Y-capacitor ground wire and the output terminal of the inverter unit 210 are out through the outgoing line terminal 500, which is equivalent to the Y-capacitor ground wire and the variable-frequency output terminal of the inverter unit 210 being out of the same path and being connected to the three-phase power terminal 110 of the variable-frequency compressor 100 and the Y-capacitor ground terminal 120 of the variable-frequency compressor 100 through the same wire harness.

[0045] When the power terminal 510 and the Y-capacitor connection terminal 520 are arranged on the outgoing line terminal 500, the connection wire harness of the whole refrigeration device is smoother, and during the processing on the production line, the number of times of screwing the screws can be reduced, and the processing efficiency of the refrigeration device can be improved.

[0046] In addition, the Y-capacitor connection terminal 520 and the power terminal 510 in the embodiment of the present application can also be arranged at different positions on the circuit board of the drive circuit 200, that is, the power terminal 510 and the Y-capacitor connection terminal 520 are arranged separately, and the Y-capacitor grounding wire of the Y-capacitor module and the output end of the inverter unit 210 are led out through different terminals and are respectively connected to the three-phase power terminals 110 of the variable-frequency compressor 100 and the Y-capacitor grounding terminal 120 of the variable-frequency compressor 100.

[0047] In some embodiments, taking the case where both the power terminal 510 and the Y-capacitor connection terminal 520 are arranged on the outgoing line terminal 500 as an example, at this time, the inverter unit 210 is connected to the variable-frequency compressor 100 through the power terminal 510 and the three-phase power terminals 110 in the outgoing line terminal 500, and the Y-capacitor module is sequentially connected to the shell of the compressor through the Y-capacitor connection terminal 520, the Y-capacitor grounding wire and the Y-capacitor grounding terminal 120 in the outgoing line terminal 500. Among them, the main path of the interference path is: inverter unit 210 - power terminal 510 in the outgoing line terminal 500 - three-phase power terminals 110 - stator winding 610 of the variable-frequency compressor 100 - distributed capacitance in the variable-frequency compressor 100 - shell of the variable-frequency compressor 100 - Y-capacitor grounding terminal 120 - Y-capacitor grounding wire - Y-capacitor connection terminal 520 - first Y-capacitor 410 and second Y-capacitor 420 - inverter unit 210. At this time, the area of the variable-frequency interference signal return loop is very small, and it is not easy to radiate and leak to the outside. And by reducing the area of the variable-frequency interference signal return loop, the radiation of electromagnetic waves can be reduced, the interference to surrounding electronic devices can be reduced, and further the electromagnetic interference rectification effect can be improved.

[0048] It can be understood that taking the refrigeration device as a refrigerator as an example, the variable-frequency interference signal in the related art generally goes from the source inverter bridge to the inner stator winding of the compressor, then through the distributed capacitance in the compressor to the shell of the compressor, then through the compressor grounding wire to the refrigerator bottom plate, and finally through the Y-capacitor connecting wire and the Y-capacitor back to the source inverter bridge, forming a large return loop. This leads to a very large area of the variable-frequency interference signal return loop. The large area of the variable-frequency interference signal return loop will increase the radiation ability of electromagnetic waves, make the interference signal easier to spread outward, be easy to radiate and leak to the outside, and lead to greater difficulty in rectifying electromagnetic interference.

[0049] Among them, the large area of the variable-frequency interference signal return loop may affect the electronic control unit and other sensitive electronic components inside the refrigerator, resulting in unstable performance or failures.

[0050] In some embodiments, the refrigeration device further includes a power cord 710 and a device bottom plate 720. The ground wire of the power cord 710 is connected to the device bottom plate 720, and the neutral wire and the live wire of the power cord 710 are connected to the drive circuit 200 through a common-mode inductor. And the refrigeration device further includes an incoming line terminal 730. The incoming line terminal 730 is arranged on the circuit board of the drive circuit 200. The incoming line terminal 730 is connected to the neutral wire and the live wire of the power cord 710 through two terminals. Specifically, the incoming line terminal 730 in the embodiment of the present application includes a first terminal and a second terminal. The live wire of the power cord 710 is connected to the first winding 310 of the common-mode inductor through the first terminal of the incoming line terminal 730, and the neutral wire of the power cord 710 is connected to the second winding 320 of the common-mode inductor through the second terminal of the incoming line terminal 730.

[0051] In some embodiments, one end of the first winding 310 is connected to the live wire of the power cord 710, and the other end is connected to an input terminal of the rectifier bridge 330. One end of the second winding 320 is connected to the neutral wire of the power cord 710, and the other end is connected to another input terminal of the rectifier bridge 330. And the ground wire of the Y capacitor in the embodiment of the present application is connected to the shell of the variable-frequency compressor 100. At this time, the neutral wire and the live wire of the power cord 710 are far from the ground wire of the Y capacitor, so as to avoid the coupling interference of the ground wire of the Y capacitor to the power cord 710 and improve the rectification effect of electromagnetic interference.

[0052] It should be noted that the ground wire of the Y capacitor conducts an interference signal current. In the related art, the ground wire of the Y capacitor in the Y capacitor module is close to the neutral wire and the live wire in the power cord 710, and it is easy to couple the interference signal to the neutral wire and the live wire, resulting in the failure of the filter. However, the ground wire of the Y capacitor in the embodiment of the present application is far from the neutral wire and the live wire of the power cord 710, so as to avoid the coupling of the interference signal current on the ground wire of the Y capacitor to the power cord 710.

[0053] In some embodiments, the variable-frequency compressor 100 includes a grounding terminal 130. The grounding terminal is connected to the device bottom plate 720 through a ground wire, so as to prevent the voltage rise during an electrical fault and reduce the risk of electric shock.

[0054] The features disclosed in the product embodiments provided by the present utility model can be arbitrarily combined without conflict to obtain new product embodiments.

[0055] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed to multiple network nodes. Exemplarily, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined, or integrated into another system, or some features may be ignored or not executed. Additionally, the couplings, direct couplings, or communication connections between the components shown or discussed may be through some interfaces, and the indirect couplings or communication connections of devices or units may be electrical, mechanical, or other forms. One can select some or all of the modules according to actual needs to achieve the purpose of the solution of this embodiment.

[0056] Those of ordinary skill in the art can understand that the system disclosed above can be implemented as software, firmware, hardware, and their appropriate combinations. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit.

[0057] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A refrigeration device, characterized in that, Comprising: A variable-frequency compressor, including three-phase power supply terminals; A drive circuit, including a Y-capacitor module and an inverter unit. The output end of the inverter unit is connected to the three-phase power supply terminals. One end of the Y-capacitor module is coupled to the input end of the inverter unit, and the other end of the Y-capacitor module is connected to the housing of the variable-frequency compressor to form a variable-frequency interference signal return loop from the inverter unit, the housing of the variable-frequency compressor to the Y-capacitor module.

2. The refrigeration device according to claim 1, characterized in that, The refrigeration device further includes an outgoing line terminal, which is arranged on the circuit board of the drive circuit. The inverter unit is connected to the variable-frequency compressor through the outgoing line terminal.

3. The refrigeration device according to claim 2, characterized in that, The outgoing line terminal includes a power supply terminal, and the power supply terminal is connected to the output end of the inverter unit and the three-phase power supply terminals through three terminals.

4. The refrigeration device according to claim 1, characterized in that The drive circuit further includes a common-mode inductor and a rectifier bridge. The common-mode inductor, the rectifier bridge and the inverter unit are connected in sequence. The Y-capacitor module is coupled at the connection point between the common-mode inductor and the rectifier bridge.

5. The refrigeration device according to claim 4, characterized in that, The common-mode inductor includes a first winding and a second winding. The Y-capacitor module includes a first Y-capacitor, a second Y-capacitor and a Y-capacitor ground wire. One end of the first Y-capacitor is connected to the connection point between the first winding and the rectifier bridge, and the other end is connected to the housing of the variable-frequency compressor through the Y-capacitor ground wire. One end of the second Y-capacitor is connected to the connection point between the second winding and the rectifier bridge, and the other end is connected to the housing of the variable-frequency compressor through the Y-capacitor ground wire.

6. The refrigeration device according to claim 5, characterized in that, The Y-capacitor module further includes a Y-capacitor wiring terminal, which is arranged on the circuit board of the drive circuit. Both the first Y-capacitor and the second Y-capacitor are connected to the Y-capacitor ground wire through the Y-capacitor wiring terminal, and the Y-capacitor wiring terminal and the Y-capacitor ground wire are fixed through a terminal fastener.

7. The refrigeration device according to claim 5, characterized in that, The refrigeration device further includes a power cord and a device bottom plate. The ground wire of the power cord is connected to the device bottom plate, and the neutral wire and the live wire of the power cord are connected to the drive circuit through the common-mode inductor.

8. The refrigeration device according to claim 7, characterized in that, The refrigeration device further includes an incoming line terminal, which is arranged on the circuit board of the drive circuit. The incoming line terminal is connected to the neutral wire and the live wire of the power cord through two terminals.

9. The refrigeration device according to claim 7, wherein, The variable-frequency compressor includes a grounding terminal, and the grounding terminal is connected to the device bottom plate through a grounding wire.

10. The refrigeration device according to claim 7, characterized in that, One end of the first winding is connected to the live wire of the power cord, and the other end is connected to an input end of the rectifier bridge. One end of the second winding is connected to the neutral wire of the power cord, and the other end is connected to the other input end of the rectifier bridge.

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