Inverter

Abstract

The invention provides an inverter, and belongs to the technical field of power conversion. The inverter comprises a bottom shell, a circuit board assembly, a wave absorbing plate, a plurality of connecting terminals, a flexible conductive strip and a cover plate. The bottom shell comprises a containing cavity and a partition rib, and the partition rib is located in the containing cavity and divides the containing cavity into a main cavity body and a sub-cavity body. The circuit board assembly comprises a circuit board, an IGBT module and a connection module. The main cavity is used for accommodating the IGBT module, and the wave absorbing plate is attached to the cavity wall of the main cavity and is used for absorbing electromagnetic waves radiated by the IGBT module. The sub-chamber is used for accommodating the connecting module, and the connecting terminal penetrates through the chamber wall of the sub-chamber and is used for being connected between the connecting module and external equipment. The surface, facing the separating ribs, of the circuit board comprises a bright copper area, the bright copper area is opposite to the separating ribs, and the flexible conductive strips are arranged between the bright copper area and the separating ribs. According to the technical scheme provided by the invention, the electromagnetic waves are blocked and absorbed on the external radiation path of the IGBT module, and the electromagnetic interference of the inverter is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power conversion, and in particular to an inverter. Background Art

[0002] The inverter is used to convert direct current into alternating current. The inverter contains an insulated gate bipolar transistor (IGBT) module, which can achieve AC-DC conversion through high-frequency switching.

[0003] During the high-frequency switching process of the IGBT module, the IGBT module will radiate electromagnetic waves. If the electromagnetic waves leak out from the inverter housing, they will cause electromagnetic interference to other electronic devices. Therefore, how to reduce the electromagnetic interference (EMI) of the inverter is a key technical issue. Summary of the invention

[0004] The present disclosure provides an inverter with low EMI. The technical solution of the inverter is as follows.

[0005] The present disclosure provides an inverter. The inverter includes a bottom shell, a circuit board assembly, an absorbing sheet, a connecting terminal, a flexible conductive strip and a cover plate. The bottom shell includes a receiving cavity and a partition rib. The partition rib is located in the receiving cavity and divides the receiving cavity into a main cavity and at least one sub-cavity. The cover plate and the bottom shell enclose the receiving cavity. The circuit board assembly includes a circuit board, an insulated gate bipolar transistor (IGBT) module and a connecting module. The main cavity is used to accommodate the IGBT module. The absorbing sheet is attached to the cavity wall of the main cavity to absorb electromagnetic waves radiated by the IGBT module. The sub-cavity is used to accommodate the connecting module. The connecting terminal passes through the cavity wall of the sub-cavity and is used to connect between the connecting module and an external device. The surface of the circuit board facing the partition rib includes a bright copper area. The bright copper area is opposite to the partition rib, and the flexible conductive strip is arranged between the bright copper area and the partition rib. Among them, the cavity wall of the sub-cavity includes a perforation for the connecting terminal to pass through. The absorbing sheet is made of absorbing material.

[0006] The technical solution provided by the present disclosure is that, firstly, an absorbing plate is attached to the cavity wall of the main cavity, and the absorbing plate can absorb the electromagnetic waves radiated by the IGBT module, thereby reducing the electromagnetic waves radiated from the IGBT module to the outside of the inverter. Secondly, by setting the sub-cavity and the main cavity to be separated by the partition ribs, the electromagnetic waves in the main cavity will be blocked by the partition ribs and cannot easily enter the sub-cavity, and then the electromagnetic waves are not easy to radiate through the perforations of the sub-cavity and the gaps between the connecting terminals. In addition, by setting a flexible conductive strip to be arranged between the bright copper area and the partition ribs of the circuit board, the flexible conductive strip can fill the gap between the bright copper area and the partition ribs, and be electrically connected to the bright copper area and the partition ribs respectively. In this way, the electromagnetic waves radiated from the main cavity to the sub-cavity through the gap can be reduced, thereby reducing the electromagnetic waves leaking through the gap. In addition, the setting of the flexible conductive strip also improves the airtightness of the main chamber, so that the electromagnetic waves radiated from the IGBT module to the main chamber will not leak out easily, but will be reflected multiple times in the main chamber. During the multiple reflection process, the electromagnetic waves will be more fully absorbed by the absorbing plate.

[0007] It can be seen that the technical solution provided by the present disclosure blocks and absorbs electromagnetic waves on the path of the external radiation of the IGBT module, reducing the electromagnetic interference of the inverter. In addition, since the path of the external radiation of the IGBT module is optimized, the technical solution provided by the present disclosure is more applicable and can be designed preventively, reducing the possibility of subsequent re-modification of the internal circuit of the inverter and reducing costs.

[0008] In a possible implementation, the partition ribs include a first partition rib and a second partition rib. The sub-chamber includes a first sub-chamber and a second sub-chamber. The first partition rib separates the main chamber and the first sub-chamber, and the second partition rib separates the main chamber and the second sub-chamber. The connection module includes a direct current (DC) module and an alternating current (AC) module. The connection terminal includes a DC terminal and an AC terminal. The first sub-chamber is used to accommodate the DC module. The DC terminal passes through the cavity wall of the first sub-chamber and is used to connect between the DC module and the DC power supply. The second sub-chamber is used to accommodate the AC module. The AC terminal passes through the cavity wall of the second sub-chamber and is used to connect between the AC module and the AC load. The bright copper area includes a first bright copper area and a second bright copper area, and the first bright copper area and the second bright copper area are opposite to the first partition rib and the second partition rib, respectively. The flexible conductive strip is arranged between the first bright copper area and the first partition rib, and between the second bright copper area and the second partition rib.

[0009] The DC module may include a lightning arrester, capacitors and inductors for filtering, and corresponding DC switches, while the AC module may include a lightning arrester, capacitors and inductors for filtering, and corresponding AC switches.

[0010] The technical solution provided by the present disclosure reduces the electromagnetic waves leaking through the gap between the outer wall of the DC terminal and the inner wall of the perforation and the gap between the outer wall of the AC terminal and the inner wall of the perforation through the above-mentioned arrangement, thereby reducing the electromagnetic interference of the inverter. In addition, the first partition rib and the second partition rib can also prevent the electrolyte of the bus capacitor in the main chamber from flowing into the first sub-chamber and the second sub-chamber after the inverter is struck by lightning, thereby reducing the possibility of arcing caused by the AC module and the DC module being short-circuited by the electrolyte, thereby improving the reliability of the inverter. Furthermore, by separating the two sub-chambers, the volume of the main chamber is reduced, which is conducive to the absorber absorbing the electromagnetic waves radiated by the IGBT module.

[0011] In a possible implementation, the partition rib also includes a third partition rib, and the sub-chamber also includes a third sub-chamber. The third partition rib separates the main chamber and the third sub-chamber. The inverter also includes a communication terminal. The communication terminal passes through the cavity wall of the third sub-chamber and is used to connect between the circuit board assembly and the external device. The bright copper area also includes a third bright copper area. The third bright copper area is opposite to the third partition rib, and the flexible conductive strip is also arranged between the third bright copper area and the third partition rib. In this way, the electromagnetic waves leaked through the gap between the outer wall of the communication terminal and the inner wall of the perforation are reduced, and the electromagnetic interference of the inverter is further reduced.

[0012] In a possible implementation, the circuit board assembly further includes a communication connector, the third sub-chamber is used to accommodate the communication connector, and the communication connector is used to dock with the communication terminal.

[0013] In a possible implementation, the inverter further includes a heat conductor, the main chamber is further used to accommodate the heat conductor, and the heat conductor is used to fit with the IGBT module. The absorbing sheet includes a first absorbing sheet and a second absorbing sheet, and along a first direction, the first absorbing sheet is arranged between the heat conductor and the first rib, and the second absorbing sheet is arranged between the heat conductor and the second rib. The first direction is perpendicular to the bottom shell wall through which the connection terminal passes.

[0014] In the technical solution provided by the present disclosure, the first absorbing plate is located on the radiation path from the IGBT module to the first sub-chamber, and the second absorbing plate is located on the radiation path from the IGBT module to the second sub-chamber. The first absorbing plate and the second absorbing plate can better absorb electromagnetic waves, reduce the electromagnetic waves entering the first sub-chamber and the second sub-chamber, and further reduce the electromagnetic interference of the inverter.

[0015] In a possible implementation, the absorbing sheet further includes a third absorbing sheet, and the third absorbing sheet is arranged between the first partition rib and the second partition rib along the second direction. The second direction is perpendicular to the first direction. In this way, the third absorbing sheet can absorb electromagnetic waves radiated to the first sub-chamber and the second sub-chamber on one side of the second direction, further reducing electromagnetic interference of the inverter.

[0016] In a possible implementation, the circuit board assembly also includes a control module. The main chamber is also used to accommodate the control module, and the control module includes a micro control unit. Along the first direction, at least a portion of the third absorbing plate is arranged between the micro control unit and the bottom shell wall through which the connecting terminal passes. Among them, the micro control unit will also radiate electromagnetic waves during operation, and the third absorbing plate can also absorb the electromagnetic waves radiated by the micro control unit, further reducing the electromagnetic interference of the inverter.

[0017] In a possible implementation, the flexible conductive strip is a nickel-carbon rubber strip, wherein the nickel-carbon rubber strip has electrical conductivity and good wear resistance.

[0018] In a possible implementation, the flexible conductive strip is attached to the surface of the partition rib facing the circuit board, so as to facilitate the positioning of the flexible conductive strip and facilitate the assembly of the inverter.

[0019] In a possible implementation, the cavity wall of the sub-chamber includes a perforation, and the connection terminal passes through the perforation. The inverter also includes a flexible conductive sheet, which is attached to the bottom shell and blocks the gap between the outer wall of the connection terminal and the hole wall of the perforation. In this way, the airtightness of the sub-chamber is improved, and the amount of electromagnetic waves in the sub-chamber leaking through the gap between the outer wall of the connection terminal and the hole wall of the perforation can be reduced, further reducing the electromagnetic interference of the inverter.

[0020] In a possible implementation, the flexible conductive sheet includes a through hole. The through hole is opposite to the perforation, and the aperture of the through hole is smaller than the aperture of the perforation. The connecting terminal passes through the through hole and the perforation, and the hole wall of the through hole fits with the outer wall of the connecting terminal. In this way, the flexible conductive sheet can easily block the entire gap.

[0021] In a possible implementation, the flexible conductive sheet is attached to the cavity wall of the sub-chamber, so that the flexible conductive sheet is not exposed and does not affect the appearance of the inverter.

[0022] In a possible implementation, the connection terminal includes a flange. The flange is located outside the bottom shell, and the outer diameter of the flange is larger than the aperture of the perforation. The flexible conductive sheet is arranged between the flange and the outer surface of the bottom shell. The flange can shield the flexible conductive sheet, and the flexible conductive sheet can also act as a gasket.

[0023] In one possible implementation, the inverter further includes a communication terminal. The cavity wall of the main chamber includes a perforation. The communication terminal passes through the perforation and is used to connect between the circuit board assembly and the external device. The inverter further includes a flexible conductive sheet, which is attached to the bottom shell and blocks the gap between the outer wall of the communication terminal and the hole wall of the perforation. In this way, the airtightness of the main chamber is improved, and the amount of electromagnetic waves in the main chamber that leak through the gap between the outer wall of the communication terminal and the hole wall of the perforation can be reduced. At the same time, it is more conducive to the absorbing sheet to absorb the electromagnetic waves radiated by the IGBT module in the main chamber, further reducing the electromagnetic interference of the inverter.

[0024] In a possible implementation manner, the flexible conductive sheet is conductive cotton. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of an inverter provided by an embodiment of the present disclosure;

[0026] Figure 2 is an exploded view of an inverter provided by an embodiment of the present disclosure;

[0027] Figure 3 is a schematic diagram of a bottom shell provided by an embodiment of the present disclosure;

[0028] Figure 4 is a schematic diagram of a circuit board assembly provided by an embodiment of the present disclosure;

[0029] Figure 5 is an exploded view of another inverter provided by an embodiment of the present disclosure;

[0030] Figure 6 is a schematic diagram of another bottom shell provided by an embodiment of the present disclosure;

[0031] Figure 7 is a schematic diagram of another circuit board assembly provided by an embodiment of the present disclosure;

[0032] Figure 8 is a schematic diagram of an attachment position of an absorbing sheet provided in an embodiment of the present disclosure;

[0033] Fig. 9 is a schematic diagram of the internal structure of an inverter provided by an embodiment of the present disclosure;

[0034] Fig.10 is a schematic diagram of the internal structure of another inverter provided by an embodiment of the present disclosure;

[0035] Fig.11 is a partial cross-sectional view of an inverter provided by an embodiment of the present disclosure;

[0036] Fig.12 is an exploded view of an inverter provided by an embodiment of the present disclosure;

[0037] Fig.13 is an exploded view of an inverter provided by an embodiment of the present disclosure;

[0038] Fig.14 is a partial cross-sectional view of an inverter provided by an embodiment of the present disclosure;

[0039] Fig.15 It is a partial cross-sectional view of an inverter provided by an embodiment of the present disclosure.

[0040] Legend

[0041] 1. bottom shell, 10. accommodating chamber, 100. gap, 101. main chamber, 102. first sub-chamber, 103. second sub-chamber, 104. third sub-chamber, 11. partition ribs, 111. first partition ribs, 112. second partition ribs, 113. third partition ribs, 12. perforation;

[0042] 2. Circuit board assembly, 21. Circuit board, 211. Bright copper area, 2111. First bright copper area, 2112. Second bright copper area, 2113. Third bright copper area, 22. IGBT module, 23. Connection module, 24. Control module, 241. Micro control unit, 201. DC module, 202. AC module, 203. Communication connector;

[0043] 3. absorbing plate, 31. first absorbing plate, 32. second absorbing plate, 33. third absorbing plate;

[0044] 4. Connecting terminal, 41. Terminal body, 42. Locking piece, 400. Flange, 401. DC terminal, 402. AC terminal, 403. Communication terminal;

[0045] 5. Flexible conductive strip;

[0046] 6. Cover plate;

[0047] 7. flexible conductive sheet, 71. through hole;

[0048] 8. Heat conducting parts;

[0049] A, first direction, B, second direction. DETAILED DESCRIPTION

[0050] Inverters, which can convert direct current into alternating current, are widely used in power supply systems. Inverters need to meet the electromagnetic compatibility (EMC) standard before they can be put into use on the market. EMC is mainly divided into electromagnetic susceptibility (EMS) and electromagnetic interference (EMI). EMS refers to the sensitivity of the inverter to electromagnetic interference from other electronic devices. EMI refers to the electromagnetic waves generated by the inverter during its own operation, which are emitted externally and cause interference to other electronic devices.

[0051] Among them, EMI includes conduction emission (CE) and radiated emission (RE). CE is the electromagnetic energy propagating outward along the power line and signal line, thus affecting other electronic devices. RE is the electromagnetic energy emitting outward in the form of electromagnetic waves, causing interference to other electronic devices. Currently, because RE interferes with the outside in the form of electromagnetic energy and is difficult to observe, there has been a lack of effective technical means to reduce RE.

[0052] The radiation source inside the inverter is mainly the insulated gate bipolar transistor (IGBT) module. The IGBT module can achieve AC / DC conversion through high-frequency switching, and also generates electromagnetic waves during the switching process.

[0053] Figure 1 FIG. 1 shows a schematic diagram of an inverter. Figure 1As shown, the inverter includes a bottom shell 1 and a cover plate 6, and the bottom shell 1 and the cover plate 6 form an almost closed chamber, and the IGBT module is located in the chamber. The inverter also includes a connection terminal 4 for connecting to an external device, for example, a DC terminal 401, an AC terminal 402 and a communication terminal 403. The connection terminal 4 passes through the shell wall of the bottom shell 1, and one end is connected to the electrical device inside the inverter, and the other end is used to connect to an external device. For example, the DC terminal 401 is used to connect to a DC power supply, and the AC terminal 402 is used to connect to an AC load. The inverter introduces DC power through the DC terminal 401, and the IGBT module converts the DC power into AC power and outputs it through the AC terminal 402. Since the connection terminal 4 needs to pass through the shell wall of the bottom shell 1, a perforation for the connection terminal 4 to pass through needs to be set on the bottom shell 1. In order to facilitate the connection terminal 4 to pass through the perforation, the aperture of the perforation is larger than the outer diameter of the connection terminal 4. This makes a gap between the connection terminal 4 and the hole wall of the perforation. The electromagnetic waves generated by the IGBT module will leak out through the gap, causing the inverter's RE to be larger, thereby interfering with other electronic equipment.

[0054] Currently, if it is found that the RE of the inverter does not meet the requirements, it is generally optimized by replacing the IGBT module, reducing the switching frequency, etc. However, on the one hand, this optimization method has limited improvement effect. On the other hand, it is impossible to carry out preventive design in advance. Once it is found that the RE does not meet the requirements, it is necessary to change the design and replace the IGBT module and the corresponding matching circuit, which is very complicated, time-consuming and costly.

[0055] In view of the above technical problems, an embodiment of the present disclosure provides an inverter. Figure 2 shows an exploded view of the inverter, Figure 3 Schematic diagram of the bottom shell 1 is shown. Figure 1 and Figure 2 As shown, the inverter includes a bottom shell 1, a circuit board assembly 2, an absorber 3, a connecting terminal 4, a flexible conductive strip 5 and a cover 6. Figure 2 and Figure 3 As shown, the bottom shell 1 includes a receiving chamber 10 and a partition rib 11. The partition rib 11 is located in the receiving chamber 10 and divides the receiving chamber 10 into a main chamber 101 and at least one sub-chamber (such as a first sub-chamber 102 and a second sub-chamber 103). The cover plate 6 and the bottom shell 1 are enclosed to form the receiving chamber 10. Figure 4 A schematic diagram of a circuit board assembly 2 is shown, Figure 4As shown, the circuit board assembly 2 includes a circuit board 21, an IGBT module 22 and a connection module 23. The circuit board 21 may be a printed circuit board (PCB). The connection module 23 may be a direct current (DC) module 201, an alternating current (AC) module 202 or a communication connector 203.

[0056] Combination Figure 2-Figure 4 As shown, the main chamber 101 is used to accommodate the IGBT module 22. The absorbing sheet 3 is attached to the wall of the main chamber 101 to absorb the electromagnetic waves radiated by the IGBT module 22, thereby reducing the electromagnetic waves radiated by the IGBT module 22 to the outside of the inverter.

[0057] The sub-chamber is used to accommodate the connection module 23. The cavity wall of the sub-chamber includes a through hole 12, and the connection terminal 4 passes through the through hole 12, and one end is connected to the connection module 23, and the other end is used to connect to an external device. Since the sub-chamber and the main chamber 101 are separated by the partition 11, the electromagnetic waves radiated from the IGBT module 22 to the main chamber 101 will be blocked by the partition 11 and cannot easily enter the sub-chamber, and thus, it is not easy to radiate out through the gap 100 between the through hole 12 of the sub-chamber and the connection terminal 4. Among them, the gap 100 is as follows: Fig.11 shown.

[0058] like Figure 2 and Figure 4 As shown, the surface of the circuit board 21 facing the partition rib 11 includes a bright copper area (or conductive plating) 211, and the bright copper area 211 is opposite to the partition rib 11. The flexible conductive strip 5 is arranged between the bright copper area 211 and the partition rib 11. In this way, the flexible conductive strip 5 can fill the gap between the bright copper area 211 and the partition rib 11, and is electrically connected to the bright copper area 211 and the partition rib 11 respectively, thereby reducing the amount of electromagnetic waves radiated from the main chamber 101 to the sub-chamber through the gap, and further reducing the electromagnetic waves leaked through the gap 100 between the perforation 12 and the connecting terminal 4. Among them, the electromagnetic waves blocked by the flexible conductive strip 5 and the partition rib 11 will be drained to the ground. On the other hand, the provision of the flexible conductive strip 5 improves the airtightness of the main chamber 101, so that the electromagnetic waves radiated by the IGBT module 22 will not leak out easily, but will be reflected multiple times in the main chamber 101. During the multiple reflections, the electromagnetic waves will be more fully absorbed by the absorbing plate 3.

[0059] It can be seen that the technical solution provided by the embodiment of the present disclosure blocks, absorbs and directs electromagnetic waves to the ground on the path of the external radiation of the IGBT module 22, thereby reducing the RE of the inverter and making the inverter meet the RE certification requirements. In addition, since the path of the external radiation of the IGBT module 22 is optimized rather than the improvement of the radiation source, the technical solution provided by the embodiment of the present disclosure is more applicable and can be designed preventively, reducing the possibility of subsequent re-modification of the internal circuit of the inverter and reducing time costs.

[0060] The wave absorbing sheet 3 can be a sheet-like structure made of any material with wave absorbing ability. The flexible conductive strip 5 is a strip-like structure with certain flexibility and conductivity. In some examples, the flexible conductive strip 5 is conductive cotton or a nickel-carbon rubber strip. The nickel-carbon rubber strip has good wear resistance.

[0061] In some examples, the flexible conductive strip 5 is pre-attached to the surface of the rib 11 facing the circuit board 21. This facilitates positioning of the flexible conductive strip 5 during assembly of the inverter. In addition, the absorbing sheet 3 can also be attached to the inner wall of the bottom shell 1.

[0062] Next, the technical solution provided by the embodiment of the present disclosure is described in combination with the specific types of the connection module 23 and the connection terminal 4 .

[0063] In some examples, such as Figure 4 As shown, the connection module 23 includes a DC module 201 and an AC module 202. Figure 2 As shown, the connection terminal 4 includes a DC terminal 401 and an AC terminal 402. One end of the DC terminal 401 is connected to the DC module 201, and the other end is used to connect to a DC power supply. One end of the AC terminal 402 is connected to the AC module 202, and the other end is used to connect to an AC load, such as a power grid. In this way, the DC module 201 introduces DC power through the DC terminal 401, and after filtering and other processing on the DC power, outputs it to the IGBT module 22. The IGBT module 22 converts the DC power into AC power, and outputs the AC power to the AC module 202. After the AC module 202 filters and other processing on the AC power, it outputs it to the AC load through the AC terminal 402.

[0064] Among them, the DC module 201 may include a lightning arrester, a DC connector, capacitors and inductors for filtering, and corresponding DC switches. The DC terminal 401 is docked with the DC connector in the DC module 201, and the various electrical components of the DC module 201 are connected through the DC connector. In other examples, the DC module 201 may not include a DC connector, but a bright copper area is set on the circuit board 21, the DC terminal 401 has a copper bar (not shown in the figure), the copper bar of the DC terminal 401 is attached to the bright copper area, and the electrical connection with the various electrical components in the DC module 201 is achieved through the bright copper area.

[0065] The AC module 202 may include a lightning arrester, an AC connector, capacitors and inductors for filtering, and corresponding AC switches, etc. The AC terminal 402 is connected to the AC connector in the AC module 202, and the various electrical components of the AC module 202 are connected through the AC connector. In other examples, the AC module 202 may not include an AC connector, but a bright copper area is set on the circuit board 21, and the AC terminal 402 has a copper busbar (not shown in the figure). The copper busbar of the AC terminal 402 is attached to the bright copper area, and the electrical connection with the various electrical components in the AC module 202 is achieved through the bright copper area.

[0066] like Figure 2 and Figure 3 As shown, the partition rib 11 includes a first partition rib 111 and a second partition rib 112. The sub-chamber includes a first sub-chamber 102 and a second sub-chamber 103. The first partition rib 111 separates the main chamber 101 and the first sub-chamber 102, and the second partition rib 112 separates the main chamber 101 and the second sub-chamber 103.

[0067] like Figure 2 and Figure 4 As shown, the first sub-chamber 102 is used to accommodate the DC module 201, and the DC terminal 401 passes through the wall of the first sub-chamber 102. The second sub-chamber 103 is used to accommodate the AC module 202, and the AC terminal 402 passes through the wall of the second sub-chamber 103. Among them, the main chamber 101 is also used to accommodate the bus capacitor. After the inverter is struck by lightning, the bus capacitor may release electrolyte. The first partition rib 111 and the second partition rib 112 can also block the electrolyte in the main chamber 101 from entering the first sub-chamber 102 and the second sub-chamber 103, thereby preventing the electrolyte from short-circuiting the DC module 201 and the AC module 202, thereby improving the reliability of the inverter.

[0068] like Figure 2 and Figure 4As shown, the bright copper area 211 includes a first bright copper area 2111 and a second bright copper area 2112. The first bright copper area 2111 and the second bright copper area 2112 are opposite to the first partition rib 111 and the second partition rib 112, respectively. There are at least two flexible conductive strips 5, and the flexible conductive strips 5 are arranged between the first bright copper area 2111 and the first partition rib 111, and between the second bright copper area 2112 and the second partition rib 112. In this way, the flexible conductive strip 5 can fill the gap between the first bright copper area 2111 and the first partition rib 111, and the gap between the second bright copper area 2112 and the second partition rib 112, thereby reducing the electromagnetic waves entering the first sub-chamber 102 and the second sub-chamber 103, and further reducing the electromagnetic waves leaking through the perforations 12 on the first sub-chamber 102 and the second sub-chamber 103. In addition, by setting two sub-chambers, the volume of the main chamber 101 is reduced, which is more conducive to the absorption of electromagnetic waves radiated by the IGBT module 22 by the absorbing plate 3.

[0069] In addition to the DC terminal 401 and the AC terminal 402, Figure 2 As shown, the connection terminal 4 also includes a communication terminal 403, which is used to connect to an external device so that the inverter can communicate with the external device. Correspondingly, the connection module 23 also includes a communication connector 203 for connecting to the communication terminal 403. The communication connector 203 can be located in the main chamber 101 or in the sub-chamber. The following describes these two situations respectively.

[0070] In some examples, such as Figure 2-Figure 4 As shown, the main chamber 101 is also used to accommodate the communication connector 203. The cavity wall of the main chamber 101 includes a through hole 12. The communication terminal 403 passes through the through hole 12.

[0071] Figure 5 An exploded view of an inverter having three ribs 11 is shown. Figure 6 A schematic diagram of a bottom shell 1 having three partition ribs 11 is shown. Figure 7 Schematic diagram of another circuit board assembly 2 is shown. In other examples, such as Figure 5-Figure 7 As shown, the partition rib 11 also includes a third partition rib 113. The sub-chamber also includes a third sub-chamber 104. The third partition rib 113 separates the main chamber 101 and the third sub-chamber 104. The third sub-chamber 104 is used to accommodate the communication connector 203, and the communication terminal 403 passes through the through hole 12 of the third sub-chamber 104. In this way, the third partition rib 113 can block the electromagnetic waves in the main chamber from radiating to the third sub-chamber 104, thereby reducing the electromagnetic waves leaking through the through hole 12 of the third sub-chamber 104.

[0072] like Figure 5 and Figure 7As shown, the bright copper area 211 also includes a third bright copper area 2113, and the third bright copper area 2113 is opposite to the third partition rib 113. The flexible conductive strip 5 is also arranged between the third bright copper area 2113 and the third partition rib 113. In this way, the flexible conductive strip 5 fills the gap between the third bright copper area 2113 and the third partition rib 113, which can reduce the electromagnetic waves entering the third sub-chamber 104, and further reduce the electromagnetic waves leaking through the through hole 12 of the third sub-chamber 104.

[0073] In other examples, the inverter includes multiple communication connectors 203, and some of the communication connectors 203 are accommodated in the main chamber 101, and other communication connectors 203 are accommodated in the sub-chamber. Multiple communication connectors 203 can be docked with a communication terminal 403, and communication with external devices can be achieved through the communication terminal 403.

[0074] It should be noted that if Figure 4 and Figure 7 As shown, the inverter further includes a control module 24, which can also be called a central processing unit (CPU) subsystem. The control module 24 is disposed in the main chamber 101. The control module 24 is docked with the communication connector 203, and further, the control module 24 can communicate with an external device through the communication connector 203 and the communication terminal 403.

[0075] Of course, in other examples, the inverter may not include the communication connector 203, and a bright copper area for connecting the communication terminal 403 may be provided on the circuit board 21, and the communication terminal 403 may be directly electrically connected to the control module 24 through the bright copper area.

[0076] In addition, the control module 24 includes a micro control unit (MCU) 241 , which also radiates electromagnetic waves during operation. The MCU 241 is housed in the main chamber 101 , and the absorbing sheet 3 can also absorb the electromagnetic waves radiated by the MCU 241 .

[0077] Next, the attachment position of the absorbing sheet 3 in the main chamber 101 is described as an example.

[0078] Figure 8 Schematic diagram of the internal structure of the bottom shell 1 is shown. In some examples, such as Figure 8 As shown, the inverter further includes a heat conductor 8, and the main chamber 101 is also used to accommodate the heat conductor 8, and the heat conductor 8 is used to fit with the IGBT module 22. The heat conductor 8 can transfer the heat generated by the IGBT module 22 to the heat sink to achieve heat dissipation of the IGBT module 22. The heat sink can be located on the outer surface of the bottom of the bottom case 1. The heat conductor 8 can include one or more ceramic sheets.

[0079] The absorbing plate 3 includes a first absorbing plate 31 and a second absorbing plate 32. Along the first direction A (the first direction A is perpendicular to the bottom shell wall through which the connecting terminal 4 passes), the first absorbing plate 31 is arranged between the heat conducting member 8 and the first partition rib 111, and the second absorbing plate 32 is arranged between the heat conducting member 8 and the second partition rib 112. That is, the first absorbing plate 31 is located on the radiation path from the IGBT module 22 to the first sub-chamber 102, and the second absorbing plate 32 is located on the radiation path from the IGBT module 22 to the second sub-chamber 103, then the first absorbing plate 31 and the second absorbing plate 32 can better absorb electromagnetic waves to reduce the electromagnetic waves entering the first sub-chamber 102 and the second sub-chamber 103.

[0080] In some examples, such as Figure 8 As shown, there are two heat conducting members 8, and the two heat conducting members 8 are respectively opposite to the first isolation rib 111 and the second isolation rib 112. The first absorbing plate 31 is located between one heat conducting member 8 and the first isolation rib 111, and the second absorbing plate 32 is located between another heat conducting member 8 and the second isolation rib 112. Each heat conducting member 8 may include one or more ceramic sheets.

[0081] In some examples, such as Figure 8 As shown, the absorbing sheet 3 further includes a third absorbing sheet 33, which is arranged between the first rib 111 and the second rib 112 along the second direction B (perpendicular to the first direction A). In this way, the third absorbing sheet 33 can absorb electromagnetic waves radiated to the first sub-chamber 102 and the second sub-chamber 103 on one side of the second direction B, further reducing the electromagnetic interference of the inverter.

[0082] In some examples, such as Figure 8 As shown, along the first direction A, at least a portion of the third absorbing plate 33 is disposed between the micro control unit 241 (the portion marked by the dotted line frame) and the bottom shell wall through which the connecting terminal 4 passes. In this way, the third absorbing plate 33 can absorb electromagnetic waves radiated by the micro control unit 241.

[0083] It should be noted that the inverter provided in the embodiment of the present disclosure may include any one or more of the first absorbing plate 31, the second absorbing plate 32 and the third absorbing plate 33. In other examples, the first absorbing plate 31, the second absorbing plate 32 and the third absorbing plate 33 may also be connected to form one absorbing plate, and the positions of different parts of the absorbing plate are the same as those of the first absorbing plate 31, the second absorbing plate 32 and the third absorbing plate 33.

[0084] Fig. 9 and Fig.10 A schematic diagram showing the internal structure of an inverter, in some examples, such as Fig. 9 and Fig.10As shown, the inverter further includes a flexible conductive sheet 7 , and the flexible conductive sheet 7 is attached to the bottom shell 1 . Fig.11 A cross-sectional view of the inverter at the through hole 12 is shown. Fig.11 As shown, the flexible conductive sheet 7 blocks the gap 100 between the outer wall of the connecting terminal 4 and the hole wall of the through hole 12. In this way, the electromagnetic waves radiated to the sub-chamber will be blocked by the flexible conductive sheet 7, thereby reducing the amount of electromagnetic waves leaking through the gap 100, thereby further reducing the radiation interference of the inverter. The flexible conductive sheet 7 can be conductive cotton.

[0085] Next, the implementation method of sealing the gap 100 with the flexible conductive sheet 7 is described by way of example.

[0086] In some examples, such as Figure 11-13 As shown, the flexible conductive sheet 7 includes a through hole 71, and the through hole 71 is opposite to the through hole 12. The aperture of the through hole 71 is smaller than the aperture of the through hole 12. The connecting terminal 4 passes through the through hole 71 and the through hole 12, and the hole wall of the through hole 71 fits with the outer wall of the connecting terminal 4. In this way, the flexible conductive sheet 7 can close the entire gap 100.

[0087] In some examples, the diameter of the through hole 71 is smaller than the outer diameter of the portion of the connecting terminal 4 passing through the through hole 12. In this way, the tightness of the hole wall of the through hole 71 and the outer wall of the connecting terminal 4 can be improved. In addition, since the flexible conductive sheet 7 is flexible, it will not affect the connecting terminal 4 passing through the through hole 12.

[0088] The flexible conductive sheet 7 may include one through hole 71 (such as the flexible conductive sheet 7 corresponding to the AC terminal 402 and the communication terminal 403 ), or may include multiple through holes 71 (such as the flexible conductive sheet 7 corresponding to the DC terminal 401 ).

[0089] In some examples, such as Fig.12 and Fig.13 As shown, the flexible conductive sheet 7 includes a plurality of through holes 71, and the plurality of connecting terminals 4 respectively pass through the plurality of through holes 71. Fig.12 and Fig.13 As shown, the multiple connection terminals are multiple DC terminals 401. The multiple DC terminals 401 can be divided into multiple pairs, each pair including a positive DC terminal 401 and a negative DC terminal 401. Different pairs of DC terminals 401 can be used to connect different external devices.

[0090] The embodiment of the present disclosure does not limit the attachment position of the flexible conductive sheet 7. In some examples, such as Figure 9-11 As shown, the flexible conductive sheet 7 is attached to the wall of the sub-chamber or the main chamber 101. That is, the flexible conductive sheet 7 is located inside the bottom shell 1, so that the flexible conductive sheet 7 is not exposed and will not affect the appearance of the inverter.

[0091] In other examples, such as Figure 12-14 As shown, the flexible conductive sheet 7 is located on the outer surface of the bottom shell 1 .

[0092] For example, Figure 12-14 As shown, the connection terminal 4 includes a flange 400, which is located outside the bottom shell 1, and the outer diameter of the flange 400 is larger than the aperture of the through hole 12. The flexible conductive sheet 7 is clamped between the flange 400 and the outer surface of the bottom shell 1. In this way, under the shielding of the flange 400, the flexible conductive sheet 7 is not exposed, which reduces the impact on the appearance of the inverter. In addition, the flexible conductive sheet 7 can also act as a gasket.

[0093] In other examples, such as Fig.15 As shown, the flexible conductive sheet 7 can be disposed on both the inner side and the outer side of the bottom shell 1, so that the sealing effect of the flexible conductive sheet 7 on the gap 100 can be improved, and the electromagnetic interference of the inverter can be further reduced.

[0094] like Fig. 9 and Fig.10 As shown, the connection terminal 4 of the inverter can be fixed in two ways. The first fixing method is that the connection terminal 4 (such as the AC terminal 402 and the communication terminal 403) is provided with a flange 400, and the flange 400 is against the outer surface of the bottom shell 1. The flange 400 is provided with a plurality of mounting holes (not shown in the figure) along the circumference, and a plurality of screws pass through the plurality of mounting holes respectively and are screwed on the shell wall of the bottom shell 1. Correspondingly, if the flexible conductive sheet 7 is clamped between the flange 400 and the outer surface of the bottom shell 1, the flexible conductive sheet 7 can also be provided with mounting holes for screw penetration. The second fixing method is that the connection terminal 4 (such as the DC terminal 401) includes a terminal body 41 and a locking member 42 (such as a nut), one end of the terminal body 41 penetrates into the interior of the bottom shell 1, and the locking member 42 is located inside the bottom shell 1 and connected to one end of the terminal body 41, thereby realizing the fixing of the connection terminal 4 in the bottom shell 1.

[0095] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be the common meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Similar words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. "Multiple" refers to two or more, unless otherwise clearly defined.

[0096] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An inverter, characterized in that: The inverter comprises a bottom shell (1), a circuit board assembly (2), an absorber (3), a connecting terminal (4), a flexible conductive strip (5) and a cover plate (6); The bottom shell (1) comprises a receiving chamber (10) and a partition rib (11), wherein the partition rib (11) is located in the receiving chamber (10) and divides the receiving chamber (10) into a main chamber (101) and at least one sub-chamber; The cover plate (6) and the bottom shell (1) are combined to form the accommodating cavity (10); The circuit board assembly (2) comprises a circuit board (21), an IGBT module (22) and a connection module (23); The main chamber (101) is used to accommodate the IGBT module (22); the absorbing plate (3) is attached to the cavity wall of the main chamber (101) and is used to absorb electromagnetic waves radiated by the IGBT module (22); The sub-chamber is used to accommodate the connection module (23); the connection terminal (4) passes through the cavity wall of the sub-chamber and is used to connect between the connection module (23) and an external device; The surface of the circuit board (21) facing the partition rib (11) comprises a bright copper area (211), the bright copper area (211) is opposite to the partition rib (11), and the flexible conductive strip (5) is arranged between the bright copper area (211) and the partition rib (11).

2. The inverter according to claim 1, characterized in that: The partition rib (11) comprises a first partition rib (111) and a second partition rib (112); the at least one sub-chamber comprises a first sub-chamber (102) and a second sub-chamber (103); wherein the first partition rib (111) separates the main chamber (101) and the first sub-chamber (102); and the second partition rib (112) separates the main chamber (101) and the second sub-chamber (103); The connection module (23) comprises a DC module (201) and an AC module (202), and the connection terminal (4) comprises a DC terminal (401) and an AC terminal (402); The first sub-chamber (102) is used to accommodate the DC module (201), and the DC terminal (401) passes through the cavity wall of the first sub-chamber (102) and is used to connect between the DC module (201) and a DC power source; The second sub-chamber (103) is used to accommodate the AC module (202), and the AC terminal (402) passes through the cavity wall of the second sub-chamber (103) and is used to connect between the AC module (202) and the AC load; The bright copper area (211) comprises a first bright copper area (2111) and a second bright copper area (2112); the first bright copper area (2111) and the second bright copper area (2112) are respectively opposite to the first partition rib (111) and the second partition rib (112); the flexible conductive strip (5) is arranged between the first bright copper area (2111) and the first partition rib (111), and between the second bright copper area (2112) and the second partition rib (112).

3. The inverter according to claim 2, characterized in that: The partition rib (11) further includes a third partition rib (113), and the at least one sub-chamber further includes a third sub-chamber (104), wherein the third partition rib (113) separates the main chamber (101) and the third sub-chamber (104); The inverter further comprises a communication terminal (403), wherein the communication terminal (403) passes through the cavity wall of the third sub-chamber (104) and is used for connecting between the circuit board assembly (2) and an external device; The bright copper area (211) further comprises a third bright copper area (2113), the third bright copper area (2113) is opposite to the third barrier rib (113), and the flexible conductive strip (5) is further arranged between the third bright copper area (2113) and the third barrier rib (113).

4. The inverter according to claim 3, characterized in that: The circuit board assembly (2) further comprises a communication connector (203), the third sub-chamber (104) is used to accommodate the communication connector (203), and the communication connector (203) is used to dock with the communication terminal (403).

5. The inverter according to any one of claims 2 to 4, characterized in that: The inverter further comprises a heat conducting member (8), the main chamber (101) is further used to accommodate the heat conducting member (8), and the heat conducting member (8) is used to be bonded to the IGBT module (22); The absorbing sheet (3) comprises a first absorbing sheet (31) and a second absorbing sheet (32); along a first direction (A), the first absorbing sheet (31) is arranged between the heat conducting member (8) and the first barrier rib (111), and the second absorbing sheet (32) is arranged between the heat conducting member (8) and the second barrier rib (112); Wherein, the first direction (A) is perpendicular to the bottom shell wall through which the connecting terminal (4) passes.

6. The inverter according to claim 5, characterized in that: The absorbing sheet (3) further comprises a third absorbing sheet (33), and along the second direction (B), the third absorbing sheet (33) is arranged between the first partition rib (111) and the second partition rib (112); Wherein, the second direction (B) is perpendicular to the first direction (A).

7. The inverter according to claim 6, characterized in that: The circuit board assembly (2) further comprises a control module (24); the main chamber (101) is further used to accommodate the control module (24); the control module (24) comprises a micro control unit (241); Along the first direction (A), at least a portion of the third wave absorbing plate (33) is arranged between the micro control unit (241) and the bottom shell wall through which the connecting terminal (4) passes.

8. The inverter according to any one of claims 1 to 7, characterized in that: The flexible conductive strip (5) is a nickel-carbon rubber strip.

9. The inverter according to any one of claims 1 to 8, characterized in that: The flexible conductive strip (5) is adhered to a side of the partition rib (11) facing the circuit board (21).

10. The inverter according to any one of claims 1 to 9, characterized in that: The cavity wall of the sub-chamber comprises a through hole (12), and the through hole (12) is used for allowing the connecting terminal (4) to pass through; The inverter further comprises a flexible conductive sheet (7), wherein the flexible conductive sheet (7) is attached to the bottom shell (1) and blocks a gap (100) between an outer wall of the connection terminal (4) and a hole wall of the through hole (12).

11. The inverter according to claim 10, characterized in that: The flexible conductive sheet (7) comprises a through hole (71), the through hole (71) is opposite to the through hole (12), and the aperture of the through hole (71) is smaller than the aperture of the through hole (12); The connecting terminal (4) passes through the through hole (71) and the through hole (12), and the hole wall of the through hole (71) is in contact with the outer wall of the connecting terminal (4).

12. The inverter according to claim 10 or 11, characterized in that: The flexible conductive sheet (7) is attached to the cavity wall of the sub-chamber.

13. The inverter according to claim 11 or 12, characterized in that: The connecting terminal (4) comprises a flange (400), the flange (400) is located outside the bottom shell (1), and the outer diameter of the flange (400) is larger than the hole diameter of the through hole (12); The flexible conductive sheet (7) is arranged between the flange (400) and the outer surface of the bottom shell (1).

14. The inverter according to claim 1 or 2, characterized in that: The inverter further comprises a communication terminal (403); The main chamber (101) comprises a through hole (12), and the communication terminal (403) passes through the through hole (12) for connection between the circuit board assembly (2) and an external device; The inverter further comprises a flexible conductive sheet (7), wherein the flexible conductive sheet (7) is attached to the bottom shell (1) and blocks a gap (100) between an outer wall of the communication terminal (403) and a hole wall of the through hole (12).

15. The inverter according to any one of claims 10 to 14, characterized in that: The flexible conductive sheet (7) is conductive cotton.

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