Frequency converter cooling fin grounding structure and frequency converter

Abstract

The utility model discloses a frequency converter radiating fin grounding structure and a frequency converter, the grounding structure comprises a radiating fin and a PCB, the PCB is provided with a connecting piece, and the connecting piece is connected with an input power supply cathode pin on the PCB; wherein the radiating fin is connected with a connecting piece on the PCB, so that the radiating fin is grounded. The negative electrode of the vehicle-mounted power supply is connected with the ground, namely the radiator is connected with the ground through the negative electrode of the power supply, so that a shielding effect can be achieved, electromagnetic interference generated in the compressor frequency converter can be prevented from spreading outwards, an EMC test result can be effectively improved, the structure is simple, installation is convenient in actual production, and additional connecting wires are not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converters, in particular to a frequency converter heat sink grounding structure and a frequency converter. Background Art

[0002] With the development of automobile electrification, more and more cars may be equipped with car refrigerators. When the car refrigerator is running, the matching refrigerator compressor inverter driver is required to drive the compressor to operate. When the inverter driver is running, the internal power tube will switch quickly, and strong electromagnetic interference will be emitted when the power tube switches, causing harm to other external electronic devices. With the development of technology, the EMC electromagnetic compatibility standards for automotive electronic equipment are becoming more and more stringent. If the EMC electromagnetic compatibility of the product does not meet the corresponding standards, the product cannot be put on the market, and the product needs to be rectified for EMC. Only after the rectification is qualified can it be put on the market.

[0003] The vehicle refrigerator compressor inverter has a built-in power drive circuit. When the circuit is running, it will generate losses and cause heat. Generally, an aluminum heat sink needs to be placed on the outer shell to dissipate heat from the inverter heating element. If the heat sink is connected to the negative pole of the power supply, since the negative pole of the vehicle power supply is connected to the ground, that is, the heat sink is connected to the ground through the negative pole of the power supply, it can play a shielding role and prevent the electromagnetic interference generated inside the compressor inverter from propagating outward, resulting in EMC test failure. However, the current heat sink grounding structure mostly requires additional wiring and has a complex structure. Utility Model Content

[0004] In order to overcome the above technical defects, the utility model provides a frequency converter heat sink grounding structure and a frequency converter.

[0005] In order to solve the above problems, the utility model is implemented according to the following technical solutions:

[0006] In a first aspect, a grounding structure of a heat sink of an inverter is provided, the grounding structure comprising:

[0007] Heat sink;

[0008] A PCB board, wherein the PCB board has a connector, and the connector is connected to the negative pin of the input power supply on the PCB circuit board;

[0009] The heat sink is connected to the connector on the PCB board, so that the heat sink is grounded.

[0010] In combination with the first aspect, preferably, the connecting member is a protruding structure on a PCB board.

[0011] In combination with the first aspect, preferably, the connecting member is a metal sheet, one side of the metal sheet is a connecting ear, the other side of the metal sheet is provided with a connecting hole, and the connecting ear of the metal sheet is welded on the PCB board.

[0012] In combination with the first aspect, preferably, the heat sink is provided with a threaded hole corresponding to the position of the connecting hole of the metal sheet, and a metal screw passes through the threaded hole on the heat sink and the connecting hole on the metal sheet to connect the heat sink to the metal sheet.

[0013] In a second aspect, a frequency converter is provided, wherein the frequency converter comprises any one of the above-mentioned frequency converter heat sink grounding structures.

[0014] In combination with the second aspect, preferably, the frequency converter further includes:

[0015] A frequency converter housing, wherein the frequency converter housing is provided with a receiving cavity having an open end;

[0016] The heat sink is connected to the open end of the inverter housing, the heat sink shields the accommodating cavity of the inverter housing, and the PCB board is located in the accommodating cavity of the inverter housing.

[0017] Compared with the prior art, the inverter heat sink grounding structure and the inverter described in the utility model have the following beneficial effects:

[0018] A frequency converter heat sink grounding structure, the grounding structure comprises: a heat sink and a PCB board, the PCB board has a connector, the connector is connected to the negative pin of the input power supply on the PCB circuit board; wherein the heat sink is connected to the connector on the PCB board, thereby realizing the heat sink grounding. Since the negative pole of the vehicle power supply is connected to the earth, that is, the radiator is connected to the earth through the negative pole of the power supply, it can play a shielding role, preventing the electromagnetic interference generated inside the compressor inverter from propagating outward, and can effectively improve the EMC test results, and the structure is simple, easy to install in actual production, and no additional wiring is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a connection diagram of a grounding structure of a frequency converter heat sink of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of a PCB of a frequency converter heat sink grounding structure of the utility model;

[0022] In the figure: 10- heat sink; 11- threaded hole;

[0023] 20-PCB board; 21-connecting piece; 211 connecting ear; 212-connecting hole;

[0024] 30-screw; 40-inverter housing. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] like Figure 1-Figure 2 As shown, a preferred implementation of a frequency converter heat sink grounding structure described in the utility model.

[0027] The vehicle refrigerator compressor inverter has a built-in power drive circuit. When the circuit is running, it will generate losses and cause heat. Generally, an aluminum heat sink needs to be placed on the shell to dissipate heat from the inverter heating element. If the heat sink is connected to the negative pole of the power supply, since the negative pole of the vehicle power supply is connected to the ground, that is, the heat sink is connected to the ground through the negative pole of the power supply, it can play a shielding role and prevent the electromagnetic interference generated inside the compressor inverter from propagating outward, resulting in EMC test failure.

[0028] The utility model provides a frequency converter heat sink grounding structure, the grounding structure includes: a heat sink 10 and a PCB board 20, the PCB board 20 has a connector 21, the connector 21 is connected to the negative pin of the input power supply on the PCB board 20; wherein the heat sink 10 is connected to the connector 21 on the PCB board 20, so as to achieve the grounding of the heat sink 10. Since the negative pole of the vehicle power supply is connected to the earth, that is, the radiator is connected to the earth through the negative pole of the power supply, it can play a shielding role, prevent the electromagnetic interference generated inside the compressor inverter from propagating outward, and can effectively improve the EMC test results, and the structure is simple, easy to install in actual production, and no additional wiring is required.

[0029] Preferably, the connector 21 is a protruding structure on the PCB board 20. A protruding structure is provided on the PCB board to directly contact the heat sink 10, so that the heat sink 10 can be grounded.

[0030] Preferably, the connecting member 21 is a metal sheet, such as Figure 2 As shown, one side of the metal sheet is a connecting ear 211 , and the other side of the metal sheet is provided with a connecting hole 212 . The connecting ear 211 of the metal sheet is welded on the PCB board 20 .

[0031] Furthermore, the heat sink 10 is provided with a threaded hole 11 corresponding to the position of the metal sheet connecting hole 212, and a metal screw 30 passes through the threaded hole 11 on the heat sink 10 and the connecting hole 212 on the metal sheet to connect the heat sink 10 to the metal sheet.

[0032] like Figure 1 As shown, it is a connection schematic diagram of a metal sheet as the connecting member 21, the metal screw 30 passes through the threaded hole 11 of the heat sink 10 and is connected to the metal sheet. Optionally, the screw can be replaced by a metal bolt. After the connection, a nut can be screwed on the screw to fix the heat sink 10 and the metal sheet. After the grounding structure is connected, it is placed in the inverter housing 40. The grounding of the heat sink 10 plays a shielding role, preventing the electromagnetic interference generated inside the compressor inverter from propagating outward, which can effectively improve the EMC test results, and the structure is simple, easy to install in actual production, and no additional wiring is required.

[0033] The utility model also provides a frequency converter, and the frequency converter comprises the above-mentioned frequency converter heat sink grounding structure.

[0034] Preferably, the frequency converter further comprises: a frequency converter housing 40, wherein the frequency converter housing 40 is provided with a receiving cavity having an open end;

[0035] The heat sink 10 is connected to the open end of the inverter housing 40 , the heat sink 10 shields the accommodating cavity of the inverter housing 40 , and the PCB board 20 is located in the accommodating cavity of the inverter housing 40 .

[0036] The working principle of the inverter heat sink grounding structure described in the utility model is: an inverter heat sink grounding structure, the grounding structure includes: a heat sink and a PCB board, the PCB board has a connecting piece, the connecting piece is connected to the negative pin of the input power supply on the PCB circuit board; wherein, the heat sink is connected to the connecting piece on the PCB board, thereby realizing the grounding of the heat sink.

[0037] For other structures of the inverter heat sink grounding structure described in this embodiment, refer to the prior art.

[0038] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A frequency converter heat sink grounding structure, characterized in that: The grounding structure comprises: Heat sink (10); A PCB board (20), wherein the PCB board (20) has a connecting piece (21), and the connecting piece (21) is connected to a negative pin of an input power supply on the PCB circuit board; The heat sink (10) is connected to a connector (21) on the PCB board (20), thereby achieving grounding of the heat sink (10).

2. The inverter heat sink grounding structure according to claim 1, characterized in that: The connecting piece (21) is a protruding structure on the PCB board (20).

3. The inverter heat sink grounding structure according to claim 1, characterized in that: The connecting piece (21) is a metal sheet, one side of the metal sheet is a connecting ear (211), the other side of the metal sheet is provided with a connecting hole (212), and the connecting ear (211) of the metal sheet is welded on the PCB board (20).

4. The inverter heat sink grounding structure according to claim 3, characterized in that: The heat sink (10) is provided with a threaded hole (11) corresponding to the position of the connecting hole (212) on the metal sheet, and a metal screw (30) passes through the threaded hole (11) on the heat sink (10) and the connecting hole (212) on the metal sheet to connect the heat sink (10) to the metal sheet.

5. A frequency converter, characterized in that: The frequency converter comprises: An inverter heat sink grounding structure as described in any one of claims 1 to 4.

6. A frequency converter according to claim 5, characterized in that: The frequency converter also includes: A frequency converter housing (40), wherein the frequency converter housing (40) is provided with a receiving cavity having an open end; The heat sink (10) is connected to the open end of the inverter housing (40), the heat sink (10) shields the accommodating cavity of the inverter housing (40), and the PCB board (20) is located in the accommodating cavity of the inverter housing (40).

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