Switching device and power conversion equipment
By increasing the cross-sectional area of the copper busbar connection, the problem of increased size of switching devices and power conversion equipment due to current carrying capacity requirements was solved, achieving miniaturization and cost reduction, and improving current carrying and heat dissipation efficiency.
Patent Information
- Application Number
- CN202422495580.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-10-15
AI Technical Summary
The increased current carrying capacity requirements of existing switching devices and power conversion equipment have led to larger copper busbars and switching devices, affecting miniaturization design and increasing processing costs.
By increasing the cross-sectional area of the copper busbar's connection part, the current carrying capacity of the copper busbar and its contact area with the circuit board are improved, reducing the need to redesign other components, thus achieving miniaturization and reducing processing costs.
This design enables miniaturization of switching devices and power conversion equipment, improves current carrying efficiency and heat dissipation efficiency, and reduces processing costs.
Smart Images
Figure CN223567501U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electronics, and particularly relates to a switching device and a power conversion device. BACKGROUND
[0002] The existing power conversion device can stop working when a leakage phenomenon occurs by accessing the switching device, so as to avoid the occurrence of an electrical accident. The copper bar of the switching device is arranged on the circuit board. With the increasing requirement for the current-carrying capacity of the power conversion device, the copper bar of the existing switching device is arranged larger and larger to improve the current-carrying capacity of the copper bar, which leads to the increasing size of the switching device, and is not conducive to the miniaturization design of the switching device and the power conversion device. CONTENT OF THE UTILITY MODEL
[0003] The present application provides a switching device and a power conversion device, and aims to solve the problem that the switching device and the power conversion device are not convenient for miniaturization design with the increasing requirement for the current-carrying capacity of the power conversion device.
[0004] In a first aspect, an embodiment of the present application provides a power conversion device. The power conversion device comprises a circuit board, a power device and a switching device. In a first direction, the power device is arranged on one side of the circuit board, and the first direction is the thickness direction of the circuit board. The switching device comprises a magnetic core, a plurality of copper bars, a secondary winding and a switching device. In the first direction, the magnetic core is located on one side of the circuit board. Each copper bar is used to connect one phase of a power grid to transmit power of the power conversion device to the power grid. Each copper bar comprises a main body part, an intermediate part and a connecting part, the main body part and the connecting part are connected through the intermediate part, the main body part serves as a primary winding and passes through the magnetic core along a second direction, and the connecting part extends along the first direction and is in contact with and fixed to the circuit board. The first direction and the second direction are perpendicular to each other. The secondary winding is wound on the magnetic core. The switching device is electrically connected to the power device, the secondary winding and the connecting part of each copper bar. The switching device is used to disconnect the power device and the power grid when the induced current of the secondary winding is greater than or equal to a threshold value. Wherein, the cross-sectional area of the connecting part is greater than the cross-sectional area of the main body part, wherein the cross section of the connecting part is perpendicular to the first direction, and the cross section of the main body part is perpendicular to the second direction.
[0005] In the implementation scheme, the current output by the power device can be transmitted to the power grid through the switching device and the plurality of copper bars. According to the principle of electromagnetic induction, the secondary winding can generate a magnetic flux and an output induced current according to the current transmitted on the plurality of copper bars, the induced current is transmitted to the switching device, and the switching device determines whether to turn on or off according to the size of the induced current. When the power conversion device has a leakage phenomenon, there is an excessive residual current in the current transmitted on the plurality of copper bars, which causes the magnetic flux generated by the current transmitted on the plurality of copper bars to be too large, and the induced current output by the secondary winding to be greater than or equal to a threshold value, so that the switching device is disconnected to stop the power conversion device from working, thereby effectively preventing electrical accidents and improving the safety of the power conversion device. The cross-sectional area of the connecting portion is greater than the cross-sectional area of the main portion. By increasing the cross-sectional area of the connecting portion, not only the current-carrying capacity of the connecting portion is improved, but also the current-carrying capacity of the copper bar is improved. Moreover, the contact area between the connecting portion and the circuit board is increased, which is conducive to reducing the contact resistance between the copper bar and the circuit board and improving the current-carrying efficiency of the copper bar and the circuit board, thereby meeting the high requirements for the current-carrying capacity of the power conversion device.
[0006] Compared with the prior art, such a design can improve the current-carrying capacity of the copper bar by only increasing the cross-sectional area of the connecting portion. This not only avoids increasing the cross-sectional area of the main portion to increase the size of the magnetic core, but also facilitates the miniaturization design of the switching device and the power conversion device. Moreover, the structure is simple and easy to manufacture, the application scenarios are wide, and the processing cost of the switching device and the power conversion device is reduced. In addition, such a design is also conducive to increasing the contact area between the copper bar and the external environment, improving the heat dissipation efficiency of the copper bar, and improving the heat dissipation efficiency of the power conversion device.
[0007] In a possible implementation, the connecting portion includes a mating end face in contact with the circuit board, and the mating end face is laminated with a surface of the circuit board in the first direction.
[0008] In the implementation scheme, the mating end face is laminated with the surface of the circuit board in the first direction, which is conducive to increasing the contact area between the connecting portion and the circuit board, reducing the contact resistance between the copper bar and the circuit board, improving the current-carrying efficiency of the copper bar and the circuit board, and improving the current-carrying capacity of the power conversion device.
[0009] In a possible implementation, the circuit board is further provided with a plug-in hole, and one end of the mating end face facing the circuit board is provided with a plug-in protrusion which is inserted into the plug-in hole in the first direction.
[0010] In the implementation scheme, the connecting portion and the circuit board are in contact and fixedly connected through the insertion of the plug-in protrusion and the plug-in hole, the structure is simple and stable, and the design is easy, which is conducive to reducing the processing cost of the power conversion device.
[0011] In a possible implementation, the cross-sectional area of the insertion protrusion is smaller than the cross-sectional area of the connecting portion, and the cross-sectional area of the insertion protrusion is perpendicular to the first direction.
[0012] In the implementation, the cross-sectional area of the insertion protrusion is smaller than the cross-sectional area of the connecting portion, which is conducive to reducing the size of the insertion hole, improving the strength of the circuit board, and improving the structural stability of the power conversion device.
[0013] In a possible implementation, the cross-sectional area of the insertion protrusion is greater than the cross-sectional area of the main body portion, and the cross-sectional area of the insertion protrusion is perpendicular to the first direction.
[0014] In the implementation, the cross-sectional area of the insertion protrusion is greater than the cross-sectional area of the main body portion, which is conducive to improving the current-carrying capacity of the insertion protrusion, improving the current-carrying capacity of the copper bar, increasing the contact area between the insertion protrusion and the circuit board, reducing the contact resistance between the insertion protrusion and the circuit board, improving the current-carrying efficiency of the copper bar and the circuit board, and improving the current-carrying capacity of the power conversion device.
[0015] In a possible implementation, the circuit board further comprises an insertion hole extending along the first direction, and the connecting portion is at least partially inserted into the insertion hole and in contact with the hole wall of the insertion hole.
[0016] In the implementation, the connecting portion is at least partially inserted into the insertion hole and in contact with the hole wall of the insertion hole, which is conducive to increasing the contact area between the connecting portion and the circuit board, reducing the contact resistance between the connecting portion and the circuit board, improving the current-carrying efficiency of the copper bar and the circuit board, and improving the current-carrying capacity of the power conversion device.
[0017] In a possible implementation, the connecting portion comprises a connecting sub-portion and a connecting sleeve, the connecting sub-portion is fixedly connected to one end of the intermediate portion, and the connecting sleeve is sleeved outside the connecting sub-portion.
[0018] In the implementation, the connecting portion comprises a connecting sub-portion and a connecting sleeve, the connecting sub-portion is fixedly connected to one end of the intermediate portion, and the connecting sleeve is sleeved outside the connecting sub-portion, which can control the cross-sectional area of the connecting portion, the current-carrying capacity of the copper bar, and the contact resistance between the copper bar and the circuit board by replacing connecting sleeves of different sizes, so as to meet the requirements of the current-carrying capacity of the power conversion device, reduce the difficulty of adjusting the cross-sectional area of the connecting portion, facilitate adjustment of the cross-sectional area of the connecting portion according to the requirements of the current-carrying capacity of the power conversion device, and reduce the processing cost of the switching device and the power conversion device.
[0019] In a possible implementation, the switch device further includes a housing, the housing includes a first housing part; the first housing part has a through hole in the second direction, the main body part is accommodated in the through hole, the magnetic core surrounds the through hole and is entirely accommodated in the first housing part, the secondary winding is entirely accommodated in the first housing part, and the switching device part is partially accommodated in the first housing part; and the connecting part is located outside the housing.
[0020] In the implementation, the magnetic core, the switching device and the copper bar are assembled together through the housing, which is conducive to improving the structural stability of the switch device. The main body part is accommodated in the through hole, and the connecting part is located outside the housing, which can avoid the adjustment of the cross-sectional area of the connecting part, thereby avoiding the redesign of the housing, reducing the difficulty of adjusting the cross-sectional area of the connecting part, facilitating the adjustment of the cross-sectional area of the connecting part according to the current-carrying capacity requirement of the power conversion device, and reducing the processing cost of the switch device and the power conversion device.
[0021] In a possible implementation, the housing further includes a second housing part, the second housing part is used for accommodating at least part of the intermediate part; the second housing part has a plurality of openings, and each intermediate part is connected to the connecting part through a corresponding opening.
[0022] In the implementation, the second housing part accommodates the intermediate part, and the second housing part can support the intermediate part, which is conducive to improving the stability of the installation of the copper bar and the housing and improving the structural stability of the switch device.
[0023] In a possible implementation, in the first direction, at least one of the plurality of openings is located on a surface of the second housing part facing the circuit board, one end of the intermediate part is exposed outside the second housing part from the opening, and the connecting part is located on a side of the second housing part facing the circuit board.
[0024] In the implementation, the connecting part is located on the side of the second housing part facing the circuit board, which ensures that the area occupied by the copper bar on the circuit board is located within the area occupied by the second housing part on the circuit board, thereby improving the space utilization of the switch device and facilitating the miniaturization design of the power conversion device.
[0025] In a possible implementation, at least one of the plurality of openings is located on a surface of the second housing part parallel to the first direction, and one end of the intermediate part is connected to the connecting part by penetrating the second housing part from the opening.
[0026] In the implementation, the connecting part is located on a side of the second housing part in a direction perpendicular to the first direction, the connecting part is located around the housing, and the projection of the connecting part on the circuit board is not blocked by the housing, which is conducive to increasing the length of the connecting part, increasing the contact area of the connecting part with the external environment, increasing the contact area of the copper bar with the external environment, and improving the heat dissipation efficiency of the copper bar.
[0027] In a possible implementation, the cross-sectional area of the intermediate portion outside at least part of the second shell portion is greater than or equal to the cross-sectional area of the main body portion.
[0028] In the above implementation, the design that the cross-sectional area of the intermediate portion outside at least part of the second shell portion is greater than or equal to the cross-sectional area of the main body portion further increases the flow capacity of the copper bar, further increases the contact area of the copper bar with the external environment, and is beneficial to improving the heat dissipation efficiency of the copper bar and the power conversion device. Moreover, the shell does not need to be redesigned, which is beneficial to reducing the processing cost of the switch device and the power conversion device.
[0029] In a possible implementation, the connection portions of the plurality of copper bars are spaced apart from each other by at least a first distance.
[0030] In the above implementation, the first distance is a safety distance, and the connection portions of the plurality of copper bars are spaced apart from each other by at least the first distance, so as to ensure that the plurality of copper bars can meet the safety regulations, to avoid electrical accidents, and is beneficial to improving the use safety of the switch device and the power conversion device.
[0031] In a second aspect, the embodiments of the present application further provide a switch device for being mounted on a circuit board. The switch device comprises a magnetic core, a plurality of copper bars, a secondary winding, and a switching device. In a first direction, the magnetic core is located on one side of the circuit board, and the first direction is the thickness direction of the circuit board. Each copper bar comprises a main body portion, an intermediate portion, and a connection portion. The main body portion and the connection portion are connected through the intermediate portion. The main body portion serves as a primary winding and passes through the magnetic core in a second direction. The connection portion extends in the first direction and is in contact with and fixed to the circuit board. The first direction and the second direction are perpendicular to each other.
[0032] The secondary winding is wound on the magnetic core. The switching device is electrically connected to the secondary winding and the connection portion of each copper bar. The cross-sectional area of the connection portion is greater than the cross-sectional area of the main body portion. The cross-sectional area of the connection portion is perpendicular to the first direction, and the cross-sectional area of the main body portion is perpendicular to the second direction.
[0033] In the above implementation, the switch device is applied to the power conversion device, and the current output by the power device of the power conversion device can be transmitted to the power grid through the switch device and the plurality of copper bars. According to the principle of electromagnetic induction, the secondary winding can generate the magnetic flux and the output induced current according to the current transmitted on the plurality of copper bars, and the switch device can be turned on or off according to the size of the induced current. When the power conversion device has a leakage phenomenon, there is an excessive residual current in the current transmitted on the plurality of copper bars, which causes the magnetic flux generated by the current transmitted on the plurality of copper bars to be too large, and the induced current output by the secondary winding to be greater than or equal to a threshold value. The switch device will be disconnected to stop the power conversion device from working, thereby effectively preventing electrical accidents and improving the safety of the power conversion device. The design that the cross-sectional area of the connecting portion is greater than the cross-sectional area of the main body portion increases the cross-sectional area of the connecting portion, thereby improving the current-carrying capacity of the connecting portion and the copper bar, and increasing the contact area of the connecting portion and the circuit board, which is conducive to reducing the contact resistance between the copper bar and the circuit board and improving the current-carrying efficiency of the copper bar and the circuit board, thereby meeting the high requirements for the current-carrying capacity of the power conversion device.
[0034] Compared with the prior art, such a design can improve the current-carrying capacity of the copper bar by only increasing the cross-sectional area of the connecting portion, which can avoid increasing the size of the magnetic core due to the increase of the cross-sectional area of the main body portion, is conducive to the miniaturization design of the switch device and the power conversion device, and has a wide application scenario, which is conducive to reducing the processing cost of the switch device and the power conversion device. In addition, such a design is also conducive to increasing the contact area of the copper bar and the external environment, improving the heat dissipation efficiency of the copper bar, and improving the heat dissipation efficiency of the power conversion device. BRIEF DESCRIPTION OF DRAWINGS
[0035] In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings needed to be used in the embodiments or the background art of the present application will be described below.
[0036] Figure 1 is a structural block diagram of a power conversion device, a photovoltaic module and a power grid provided by the embodiment of the present application;
[0037] Figure 2 is Figure 1 is a perspective structural schematic diagram of the power conversion device shown in
[0038] Figure 3 is Figure 2 is an electrical principle schematic diagram of the power conversion device, the photovoltaic module and the power grid shown in
[0039] Figure 4 isFigure 2 A-A line of the power conversion device shown in the structural schematic view along the line;
[0040] Figure 5 is Figure 2 A-A line of the switching device of the power conversion device shown in the structural schematic view along the line;
[0041] Figure 6 is Figure 5 B-B line of the switching device shown in the structural schematic view along the line;
[0042] Figure 7 is Figure 5 C-C line of the switching device shown in the structural schematic view along the line;
[0043] Figure 8 is Figure 5 The switching device shown in the structural schematic view under another embodiment;
[0044] Figure 9 is Figure 2 D-D line of the power conversion device shown in the structural schematic view along the line;
[0045] Figure 10 is Figure 2 The power conversion device shown in the structural schematic view of the circuit board;
[0046] Figure 11 is another power conversion device provided by the embodiment of the application;
[0047] Figure 12 is another power conversion device provided by the embodiment of the application;
[0048] Figure 13 is Figure 12 The power conversion device shown in the enlarged view of the XI I I part;
[0049] Figure 14 is another power conversion device provided by the embodiment of the application. DETAILED DESCRIPTION
[0050] The embodiment of the application provides a switching device and a power conversion device. The switching device is applied to the power conversion device. The power conversion device is an electronic device which can convert a certain current into other type current. The switching device can be disconnected or connected to control whether the power conversion device works.
[0051] The embodiment of the application is described below with reference to the drawings in the embodiment of the application.
[0052] Please refer to Figure 1 ,Figure 1 is a structural block diagram of a power conversion device 100 cooperating with a photovoltaic module 200 and a power grid 300 provided by an embodiment of the present application.
[0053] As shown in Figure 1 , the power conversion device 100 is a photovoltaic inverter in an example. In other embodiments, the power conversion device 100 can also be a rectifier, a transformer, a current transformer, or other inverters, etc. electronic devices for power conversion. The power conversion device 100 is used to convert the direct current output by the photovoltaic module 200 into alternating current and supply the power grid 300. In other embodiments, the power conversion device 100 can also be used to convert the direct current output by the photovoltaic module 200 into alternating current and supply the load device. The load device can be electronic devices that use alternating current, including but not limited to motors, fans, air conditioners, etc. In other embodiments, the power conversion device 100 can also be applied to electric drive controllers. For example, the power conversion device 100 can convert the direct current output by the battery into alternating current to supply the motor.
[0054] The power conversion device will have a leakage phenomenon due to insulation damage or device failure, and in this case, excessive residual current will occur in the power conversion device, which will cause an electrical accident. The existing power conversion device can stop working when a leakage phenomenon occurs by connecting a switching device to avoid electrical accidents. Among them, the copper bar of the switching device is mounted on the circuit board to connect the circuit of the power conversion device to realize the flow. With the increasing power of the power conversion device, the flow capacity of various devices in the power conversion device is also increasing, and the copper bar of the switching device is also increasing to improve the flow capacity; but in order to adapt to the size of the copper bar, other devices of the switching device need to be redesigned to be large, which not only leads to the increasing size of the switching device, which is not conducive to the miniaturization design of the switching device and the miniaturization design of the power conversion device, but also leads to high processing cost of the switching device and high processing cost of the power conversion device.
[0055] To solve the above problems, the embodiments of the present application increase the size of the end of the copper bar, which improves the flow capacity of the copper bar and avoids increasing the size of the switching device, which is conducive to the miniaturization design of the switching device and the miniaturization design of the power conversion device, and avoids redesigning other devices of the switching device, which is conducive to reducing the processing cost of the switching device.
[0056] Please refer to Figure 2 , Figure 3 and Figure 4 , and in combination with Figure 1 , Figure 2 is Figure 1 the perspective structural schematic diagram of the power conversion device 100. Figure 3 is Figure 2An electrical schematic diagram of the power conversion device 100 cooperating with the photovoltaic module 200 and the power grid 300 is shown. Figure 4 Figure 2 A structural schematic diagram of the power conversion device 100 along the A-A line is shown.
[0057] As shown in Figure 2 Figure 3 Figure 4 The power conversion device 100 includes the circuit board 1, the power device 2 and the switching device 3. The power device 2 and the switching device 3 are both mounted on the circuit board 1. Specifically, in the Z-axis direction, the power device 2 and the switching device 3 are mounted on one side of the circuit board 1. In other embodiments, the power device 2 and the switching device 3 can also be mounted on both sides of the circuit board 1.
[0058] For the convenience of description, the present application defines any three directions as a first direction (i.e. the Z-axis direction shown in the figure), a second direction (i.e. the Y-axis direction shown in the figure) and a third direction (i.e. the X-axis direction shown in the figure), the first direction (i.e. the Z-axis direction shown in the figure) is the thickness direction of the circuit board 1, and the first direction (i.e. the Z-axis direction shown in the figure), the second direction (i.e. the Y-axis direction shown in the figure) and the third direction (i.e. the X-axis direction shown in the figure) are perpendicular to each other. In the present embodiment, the second direction (i.e. the Y-axis direction shown in the figure) is the width direction of the circuit board 1, and the third direction (i.e. the X-axis direction shown in the figure) is the length direction of the circuit board 1. In other embodiments, the second direction (i.e. the Y-axis direction shown in the figure) can also be the length direction of the circuit board 1, and the third direction (i.e. the X-axis direction shown in the figure) can also be the width direction of the circuit board 1.
[0059] The switching device 3 includes the magnetic core 20, the plurality of copper bars 30, the secondary winding 40 and the switching device 50, and further includes the shell 10. In the Z-axis direction (i.e. the first direction), the shell 10, the magnetic core 20, the plurality of copper bars 30, the secondary winding 40 and the switching device 50 are all located on one side of the circuit board 1. Specifically, in the Z-axis direction, the shell 10, the magnetic core 20, the plurality of copper bars 30, the secondary winding 40 and the switching device 50 are all located on the side of the circuit board 1 facing the power device 2. In other embodiments, in the Z-axis direction, the shell 10, the magnetic core 20, the plurality of copper bars 30, the secondary winding 40 and the switching device 50 can also be located on the side of the circuit board 1 away from the power device 2. The magnetic core 20, the plurality of copper bars 30 and the switching device 50 are all mounted on the shell 10. The magnetic core 20 is a ring-shaped magnetic core, which can specifically be a rectangular ring, a circular ring or other special-shaped ring. Among them, the axis of the magnetic core 20 is parallel to the Y-axis direction.
[0060] Each of the copper bars 30 is used to connect one phase of the power grid 300 to transmit power of the power conversion device 100 to the power grid 300. Specifically, each of the copper bars 30 is mounted on the circuit board 1, and each of the copper bars 30 is connected to one phase of the power grid 300 through the circuit board 1. For example, the plurality of copper bars 30 includes a first copper bar 30a, a second copper bar 30b and a third copper bar 30c which are connected to three phases of the power grid 300 respectively. In other embodiments, the number of the copper bars 30 can also be 2 or other numbers. The plurality of copper bars 30 are arranged at intervals to achieve insulation.
[0061] It should be noted that the copper bars 30 mentioned in the embodiments of the present application mainly refer to conductive connecting components with large current-carrying capacity, and are not limited to specific structural forms, which can be cylindrical, rectangular or other shapes.
[0062] Each of the copper bars 30 includes a main body part 31, an intermediate part 32 and a connecting part 33, and the main body part 31 and the connecting part 33 are connected through the intermediate part 32. Specifically, in the Y-axis direction, the connecting part 33 is located on one side of the main body part 31, one end of the intermediate part 32 is fixedly connected to one end of the main body part 31, and the other end is fixedly connected to the connecting part 33. The main body part 31 serves as the primary winding and passes through the magnetic core 20 along the Y-axis direction (i.e. the second direction), and the connecting part 33 extends along the Z-axis direction (i.e. the first direction) and contacts and is fixed to the circuit board 1. Among them, the main body part 31 and the intermediate part 32 are mounted in the shell 10, and the connecting part 33 is located outside the shell 10. For example, the number of the intermediate part 32 and the connecting part 33 is 2. In the Y-axis direction, the two connecting parts 33 are located on both sides of the main body part 31, and the two connecting parts 33 are fixedly connected to the main body part 31 through the two intermediate parts 32 respectively.
[0063] The secondary winding 40 is wound on the magnetic core 20. The secondary winding 40 can couple output induced current according to the current transmitted on the main body part 31 of the plurality of copper bars 30. By detecting whether the size of the induced current exceeds the threshold value, it can be confirmed whether the current transmitted on the main body part 31 of the plurality of copper bars 30 exceeds the threshold value.
[0064] The switching device 50 is electrically connected to the power device 2, the secondary winding 40 and the connecting part 33 of each of the copper bars 30. Specifically, the switching device 50 is connected to both ends of the secondary winding 40, the switching device 50 is mounted on the circuit board 1, and the switching device 50 is electrically connected to the power device 2 and the connecting part 33 of each of the copper bars 30 through the circuit board 1. The power device 2 is connected to the power grid 300 through the switching device 50 and the plurality of copper bars 30. The switching device 50 is used to disconnect the power device 2 and the power grid 300 when the induced current of the secondary winding 40 is greater than or equal to the threshold value.
[0065] The direct current outputted by the photovoltaic module 200 is transmitted to the power device 2. The power device 2 is used to convert the direct current into alternating current. The alternating current outputted by the power device 2 is transmitted to the power grid 300 through the switching device 50 and the plurality of copper bars 30, so as to supply the power grid 300. According to the electromagnetic induction principle, the secondary winding 40 can generate magnetic flux and output induced current according to the current transmitted on the plurality of copper bars 30. The induced current is transmitted to the switching device 50. When the leakage phenomenon occurs in the power conversion device 100, there is excessive residual current in the current transmitted on the plurality of copper bars 30, which causes the magnetic flux generated by the current transmitted on the plurality of copper bars 30 to be excessive, and the induced current outputted by the secondary winding 40 to the switching device 50 to be excessive. The switching device 50 can be disconnected so that the power conversion device 100 stops working, thereby effectively preventing the occurrence of electrical accidents and improving the use safety of the power conversion device 100.
[0066] The cross-sectional area of the connecting portion 33 is greater than the cross-sectional area of the main body portion 31. The cross section of the connecting portion 33 is perpendicular to the Z-axis direction (i.e., the first direction), and the cross section of the main body portion 31 is perpendicular to the Y-axis direction (i.e., the second direction). The power conversion device 100 provided by the embodiments of the present application improves the current-carrying capacity of the copper bar 30 by only increasing the cross-sectional area of the connecting portion 33 of the copper bar 30, which can avoid the problem that the size of the shell 10 and the magnetic core 20 needs to be redesigned to correspond to the increase in the overall size of the copper bar 30 in the prior art, which is conducive to the miniaturization design of the switching device 3 and the reduction of the processing cost of the switching device 3. Moreover, increasing the contact area of the connecting portion 33 with the circuit board 1 can reduce the contact resistance between the connecting portion 33 and the circuit board 1, which is conducive to improving the current-carrying efficiency between the connecting portion 33 and the circuit board 1. In addition, such a design also increases the contact area of the connecting portion 33 with the external environment and the contact area of the copper bar 30 with the external environment, which is conducive to improving the heat dissipation efficiency of the copper bar 30.
[0067] Based on the above-mentioned concept of only increasing the cross-sectional area of the connecting portion 33 to improve the current-carrying capacity of the copper bar 30 and the current-carrying efficiency of the copper bar 30 with the circuit board 1, as long as the connecting portion 33 can be in contact with the circuit board 1 for current-carrying, the cooperation relationship between the connecting portion 33 and the circuit board 1 can be various. For example, the connecting portion 33 can be inserted into the circuit board 1, or it can be located outside the circuit board 1 and in contact with the surface of the circuit board 1, which is not limited in the present application. The following examples are described in multiple embodiments.
[0068] Please refer to Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 , and in combination with Figure 2 ,Figure 5 is Figure 2 is a structural schematic view of the switching device 3 of the power conversion device 100 shown in Figure 6 is Figure 5 is a structural schematic view of the switching device 3 along the B-B line shown in Figure 7 is Figure 5 is a structural schematic view of the switching device 3 along the C-C line shown in Figure 8 is Figure 5 is a structural schematic view of the switching device 3 in another embodiment. Figure 9 is Figure 2 is a structural schematic view of the power conversion device 100 along the D-D line shown in Figure 10 is Figure 2 is a three-dimensional structural schematic view of the circuit board 1 of the power conversion device 100 shown in
[0069] As shown in Figure 2 and Figure 5 shown in the embodiments shown in Figure 2 and Figure 5 shown in the embodiments shown in Figure 2 , Figure 5 and Figure 6 shown in the embodiments shown in Figure 2 , Figure 5 and Figure 6 shown in the embodiments shown in
[0070] In this embodiment, the first housing part 11 comprises a receiving cavity 11a which is enclosed outside the through hole 110. Specifically, the first housing part 11 comprises two first fitting parts 111, a second fitting part 112 and a third fitting part 113. In the Y-axis direction, the second fitting part 112 is fixedly connected between the two first fitting parts 111; the third fitting part 113 is fixedly connected between the two first fitting parts 111 and is enclosed around the second fitting part 112 and is arranged in a spaced manner with the second fitting part 112. The two first fitting parts 111, the second fitting part 112 and the third fitting part 113 jointly enclose the receiving cavity 11a. The through hole 110 penetrates the second fitting part 112 in the Y-axis direction. The number of the through holes 110 is multiple. For example, the multiple through holes 110 comprise a first through hole 110a, a second through hole 110b and a third through hole 110c. The main body part 31 of the first copper bar 30a corresponds to the first through hole 110a, the main body part 31 of the second copper bar 30b corresponds to the second through hole 110b, and the main body part 31 of the third copper bar 30c corresponds to the third through hole 110c. In other embodiments, the number of the through holes 110 can also be one or two. The magnetic core 20 and the secondary winding 40 are all received in the receiving cavity 11a; wherein the magnetic core 20 is sleeved outside the second fitting part 112. The switching device 50 is partially received in the receiving cavity 11a and partially penetrates the third fitting part 113 and is arranged on the circuit board 1.
[0071] In some embodiments, the housing 10 further comprises a second housing part 12 for receiving at least part of the intermediate part 32; the second housing part 12 has multiple openings 120, and each intermediate part 32 is connected with the connecting part 33 through a corresponding opening 120. The connecting part 33 is located outside the first housing part 11 and the second housing part 12. By receiving the intermediate part 32 through the second housing part 12, the second housing part 12 can play a supporting role for the intermediate part 32, which is conducive to improving the stability of the installation of the copper bar 30 and the housing 10 and is conducive to improving the structural stability of the switching device 3.
[0072] Further, in the Y-axis direction (i.e. in the first direction, at least one of the multiple openings 120 is located on the surface of the second housing part 12 facing the circuit board 1, one end of the intermediate part 32 is exposed outside the second housing part 12 from the opening 120, and the connecting part 33 is located on the side of the second housing part 12 facing the circuit board 1; and / or, at least one of the multiple openings 120 is located on the surface of the second housing part 12 parallel to the Z-axis direction (i.e. the first direction), one end of the intermediate part 32 penetrates out of the second housing part 12 from the opening 120 and is connected with the connecting part 33. Parallel can allow a small deviation.
[0073] As shown in Figure 2 , Figure 6 and Figure 7 , in Figure 2 ,Figure 6 and Figure 7 In the embodiment shown, the second housing part 12 is fixedly connected with the first housing part 11. Specifically, the second housing part 12 is sleeved on the outside of the first housing part 11 along the Z-axis direction. The second housing part 12 comprises a first surface 121, a second surface 122 and a third surface 123. In the X-axis direction, the first surface 121 and the second surface 122 are oppositely and separately arranged, and the third surface 123 is fixedly connected between the first surface 121 and the second surface 122. In the X-axis direction, the first surface 121 and the second surface 122 are both away from the first housing part 11 and parallel to the Z-axis direction (i.e. the first direction). In the Z-axis direction, the third surface 123 faces the circuit board 1.
[0074] The plurality of openings 120 comprises a first opening 120a, a second opening 120b and a third opening 120c. The first opening 120a is located on the third surface 123, the second opening 120b is located on the first surface 121, and the third opening 120c is located on the second surface 122. The middle part 32 of the first copper bar 30a corresponds to the first opening 120a, the middle part 32 of the second copper bar 30b corresponds to the second opening 120b, and the middle part 32 of the third copper bar 30c corresponds to the third opening 120c.
[0075] Specifically, the second housing part 12 is provided with a first matching groove 124a. In the Y-axis direction, the first matching groove 124a is located on one side of the first through hole 110a and communicates with the first through hole 110a, and extends to the third surface 123 along the Z-axis direction. The first opening 120a is the opening of the first matching groove 124a. The middle part 32 of the first copper bar 30a is entirely accommodated in the first matching groove 124a, and one end of the middle part 32 of the first copper bar 30a away from the main part 31 is exposed outside the second housing part 12 from the third surface 123 through the first opening 120a. The connecting part 33 of the first copper bar 30a is located on one side of the second housing part 12 facing the circuit board 1. The design that the connecting part 33 is located on one side of the second housing part 12 facing the circuit board 1 ensures that the area occupied by the copper bar 30 (i.e. the first copper bar 30a) on the circuit board 1 is located within the area occupied by the second housing part 12 on the circuit board 1, which is beneficial to improve the space utilization of the switch device 3 and facilitate the miniaturization design of the power conversion equipment 100. In some other embodiments, the middle part 32 of the first copper bar 30a can also be partially accommodated in the first matching groove 124a, and one end of the middle part 32 of the first copper bar 30a away from the main part 31 can pass through the second housing part 12 from the third surface 123 through the first opening 120a.
[0076] Exemplarily, the number of the first openings 120a is 2. In the Y-axis direction, the 2 first openings 120a are located on both sides of the first housing part 11. The 2 middle parts 32 of the first copper bar 30a correspond to the 2 first openings 120a respectively, and the 2 connecting parts 33 of the first copper bar 30a are located on the side of the second housing part 12 facing the circuit board 1. Among them, the middle part 32 of the first copper bar 30a is a bending section, which is fixedly connected with the main body part 31 and extends along the Y-axis direction and then bends to extend along the Z-axis direction. The shape of the middle part 32 of the first copper bar 30a can be various, for example, the middle part 32 of the first copper bar 30a can be a wave shape or a circular arc section, etc.
[0077] The second housing part 12 is also provided with a second matching groove 124b, which is located on one side of the through hole 110 and communicates with the through hole 110 in the Y-axis direction, and extends to the first surface 121 along the Z-axis direction. The second opening 120b is the opening of the second matching groove 124b. The middle part 32 of the second copper bar 30b includes a first section 321 and a second section 322, the first section 321 is fixedly connected with one end of the main body part 31, and the second section 322 is fixedly connected with the first section 321 and the connecting part 33. The first section 321 of the second copper bar 30b is accommodated in the second matching groove 124b, and the second section 322 of the second copper bar 30b is located outside the second matching groove 124b (i.e. the second housing part 12). Among them, the end of the middle part 32 of the second copper bar 30b away from the main body part 31 passes out of the second housing part 12 from the first surface 121 through the second opening 120b. The connecting part 33 of the second copper bar 30b is located on the side of the second housing part 12 away from the second surface 122. In this way, the connecting part 33 is located on one side of the second housing part 12 in the X-axis direction (i.e. the direction perpendicular to the first direction), the connecting part 33 is located around the housing 10, the projection of the connecting part 33 on the circuit board 1 is not blocked by the housing 10, which is conducive to increasing the length of the connecting part 33, increasing the contact area of the connecting part 33 with the external environment, increasing the contact area of the copper bar 30 (i.e. the second copper bar 30b) with the external environment, and improving the heat dissipation efficiency of the copper bar 30. In other embodiments, the connecting part 33 can also be located on one side of the second housing part 12 in the Y-axis direction.
[0078] Exemplarily, the number of the second openings 120b is 2. In the Y-axis direction, the 2 second openings 120b are located on both sides of the first housing part 11. The 2 middle parts 32 of the second copper bar 30b correspond to the 2 second openings 120b respectively, and the 2 connecting parts 33 of the second copper bar 30b are located on the side of the second housing part 12 away from the second surface 122. The 2 middle parts 32 of the third copper bar 30c correspond to the 2 third openings 120c, and the 2 connecting parts 33 of the third copper bar 30c are located on the side of the second housing part 12 away from the first surface 121.
[0079] The first section 321 of the second copper bar 30b is a bent section. The first section 321 is fixedly connected with the main body 31 and extends along the Y-axis direction and then is bent to extend along the X-axis direction. The second section 322 of the second copper bar 30b includes a first sub-section 3221 and a second sub-section 3222. The first sub-section 3221 extends along the X-axis direction and is fixedly connected with the end of the first section 321 away from the main body 31. The second sub-section 3222 is a bent section. The second sub-section 3222 is fixedly connected with the end of the first sub-section 3221 away from the first section 321 and is bent to be fixedly connected with the connecting portion 33 along the Z-axis direction. The shape of the intermediate portion 32 of the second copper bar 30b can be various, for example, the first section 321 of the second copper bar 30b can be a wave-shaped section or a circular arc section, etc. The second sub-section 3222 of the second copper bar 30b can be omitted. The connecting portion 33 is fixedly connected with the end of the first sub-section 3221 away from the first section 321. The shape of the intermediate portion 32 of the copper bar 30 is not limited in the present application. The cooperation relationship between the intermediate portion 32 of the third copper bar 30c and the third opening 120c can refer to the related description of the cooperation relationship between the intermediate portion 32 of the second copper bar 30b and the second opening 120b, and will not be described in detail.
[0080] As shown in Figure 2 , Figure 5 and Figure 8 , in some embodiments, the cross-sectional area of the at least part of the intermediate portion 32 located outside the second housing portion 12 is greater than or equal to the cross-sectional area of the main body 31. The design that the cross-sectional area of the at least part of the intermediate portion 32 located outside the second housing portion 12 is greater than or equal to the cross-sectional area of the main body 31 further increases the flow capacity of the copper bar 30, further increases the contact area between the copper bar 30 and the external environment, and is beneficial to improve the heat dissipation efficiency of the copper bar 30 and the power conversion device 100. Moreover, the housing 10 does not need to be redesigned, which is beneficial to reduce the processing cost of the switch device 3 and the power conversion device 100.
[0081] As shown in Figure 2 and Figure 5 , in Figure 2 and Figure 5In the embodiment shown, the cross-sectional area of the second section 322 of the second copper bar 30b is equal to the cross-sectional area of the main body 31. Specifically, the cross-sectional area of the first sub-section 3221 of the second copper bar 30b and the cross-sectional area of the second sub-section 3222 of the second copper bar 30b are both equal to the cross-sectional area of the main body 31. The cross-section of the first sub-section 3221 is perpendicular to the Y-axis direction, and the cross-section of the second sub-section 3222 is perpendicular to the extension direction of the second sub-section 3222. In other embodiments, the cross-sectional area of the first sub-section 3221 of the second copper bar 30b or the cross-sectional area of the second sub-section 3222 of the second copper bar 30b can be less than or greater than the cross-sectional area of the main body 31. The intermediate portion 32 of the third copper bar 30c can be described with reference to the second copper bar 30b, and will not be described again.
[0082] As shown in FIG. 1, Figure 8 As shown in FIG. 1, Figure 8 In the embodiment shown, the cross-sectional area of the second section 322 of the second copper bar 30b is greater than the cross-sectional area of the main body 31. Specifically, the cross-sectional area of the first sub-section 3221 of the second copper bar 30b and the cross-sectional area of the second sub-section 3222 of the second copper bar 30b are both equal to the cross-sectional area of the main body 31. The third copper bar 30c can be described with reference to the second copper bar 30b, and will not be described again. In other embodiments, the cross-sectional area of the first sub-section 3221 of the second copper bar 30b and the cross-sectional area of the second sub-section 3222 of the second copper bar 30b can not be equal. The cross-sectional area of the first sub-section 3221 of the second copper bar 30b or the cross-sectional area of the second sub-section 3222 of the second copper bar 30b can be less than or equal to the cross-sectional area of the main body 31.
[0083] As shown in FIG. 1, Figure 2 , Figure 9 and Figure 10 As shown in FIG. 1, Figure 2 , Figure 9 and Figure 10 In the embodiment shown, the circuit board 1 further comprises a plug hole 101 extending along the Z-axis direction (i.e., the first direction), and the connecting portion 33 is at least partially inserted into the plug hole 101 and in contact with the hole wall of the plug hole 101. For example, the connecting portion 33 is partially inserted into the plug hole 101 and in contact with the hole wall of the plug hole 101.
[0084] In this embodiment, the circuit board 1 comprises a first surface 102 and a second surface 103, the first surface 102 and the second surface 103 are oppositely arranged in the direction of the Z axis. The plug-in hole 101 extends from the first surface 102 to the second surface 103 in the direction of the Y axis. The number of plug-in holes 101 is multiple, and the multiple plug-in holes 101 correspond to all the connecting parts 33 in the multiple copper bars 30 one by one. Specifically, there are 6 connecting parts 33 in the multiple copper bars 30, and the number of plug-in holes 101 is 6. It can be understood that the number of plug-in holes 101 is different according to the number of copper bars 30. For example, each copper bar 30 has 2 connecting parts 33, each copper bar 30 corresponds to 2 plug-in holes 101, and the number of plug-in holes 101 can also be 4, 8 or more.
[0085] For example, the connecting part 33 is a cylindrical body. The plug-in hole 101 is a circular hole. The connecting part 33 comprises a matching end surface 331 and a matching peripheral surface 332. The matching peripheral surface 332 is fixedly connected with the matching end surface 331. In the direction of the Z axis, the matching end surface 331 faces away from the middle part 32. The matching end surface 331 is perpendicular to the direction of the Z axis. The plug-in hole 101 comprises a bottom wall 1011 and a side wall 1012, and the side wall 1012 is fixedly connected with the bottom wall 1011. Among them, the matching end surface 331 of the connecting part 33 is laminated and in contact with the bottom wall 1011. Specifically, the matching end surface 331 of the connecting part 33 is in contact with and fixedly connected with the bottom wall 1011. The matching peripheral surface 332 of the connecting part 33 is in contact with and fixedly connected with the side wall 1012. In other embodiments, the connecting part 33 can also be a rectangular cylindrical body, and the plug-in hole 101 corresponds to a rectangular hole. The shape of the connecting part 33 and the plug-in hole 101 can be various shapes, which are not limited in the present application.
[0086] The design that the connecting part 33 is at least partially inserted into the plug-in hole 101 and in contact with the hole wall of the plug-in hole 101 is beneficial to increase the contact area of the connecting part 33 and the circuit board 1, reduce the contact resistance of the connecting part 33 and the circuit board 1, improve the current flow efficiency of the copper bar 30 and the circuit board 1, and improve the current flow capacity of the power conversion device 100.
[0087] In some embodiments, the connecting parts 33 of the multiple copper bars 30 are spaced apart from each other by at least a first distance. The first distance is a safety distance, and the connecting parts 33 of the multiple copper bars 30 are spaced apart from each other by at least the first distance to ensure that the multiple copper bars 30 can meet the safety regulations to avoid electrical accidents, and to improve the safety of the switch device 3 and the power conversion device 100.
[0088] In Figure 2In the illustrated embodiment, in the Y-axis direction, the two connecting portions 33 of each copper busbar 30 are arranged sequentially and spaced apart with a first distance. In the X-axis direction, one connecting portion 33 of the second copper busbar 30b, one connecting portion 33 of the first copper busbar 30a, and one connecting portion 33 of the third copper busbar 30c are arranged sequentially and spaced apart with a second distance, and another connecting portion 33 of the second copper busbar 30b, another connecting portion 33 of the first copper busbar 30a, and another connecting portion 33 of the third copper busbar 30c are arranged sequentially and spaced apart with a second distance, the second distance being greater than the first distance. In some other embodiments, one connecting portion 33 of the second copper busbar 30b, one connecting portion 33 of the first copper busbar 30a, and one connecting portion 33 of the third copper busbar 30c may also be arranged sequentially and spaced apart with a first distance. The distance between the connecting part 33 of the second copper busbar 30b and the connecting part 33 of the first copper busbar 30a, and the distance between the connecting part 33 of the first copper busbar 30a and the connecting part 33 of the third copper busbar 30c may also be unequal.
[0089] like Figure 2 , Figure 5 and Figure 10 As shown, in Figure 2 , Figure 5 and Figure 10 In the illustrated embodiment, the switching device 50 includes a body 51 and a connecting terminal 52. The connecting terminal 52 is disposed on one side of the body 51 in the Z-axis direction. The body 51 is housed within a first housing portion 11, and the connecting terminal 52 passes through the first housing portion 11 and is mounted on the circuit board 1. Specifically, the body 51 is housed within a receiving cavity 11a. The connecting terminal 52 passes through the receiving cavity 11a and through a third mating portion 113 of the first housing portion 11 to be mounted on the circuit board 1.
[0090] Furthermore, the circuit board 1 also includes mounting holes 104. The mounting holes 104 extend along the Z-axis direction. Specifically, the mounting holes 104 extend from the first surface 102 towards the second surface 103 along the Z-axis direction. The connection terminals 52 of the switching device 50 are at least partially inserted into the mounting holes 104 and contact the hole walls of the mounting holes 104. Exemplarily, both the number of connection terminals 52 and the number of mounting holes 104 are multiple. Specifically, both the number of connection terminals 52 and the number of mounting holes 104 are six. Each of the multiple connection terminals 52 corresponds one-to-one with a multiple of the mounting holes 104. In some other embodiments, the number of connection terminals 52 and the number of mounting holes 104 may also be one, two, or more. The design that the connection terminal 52 is at least partially inserted into the mounting hole 104 and contacts the hole wall of the mounting hole 104 is beneficial to increasing the contact area between the connection terminal 52 and the circuit board 1, reducing the contact resistance between the connection terminal 52 and the circuit board 1, improving the current carrying efficiency between the switching device 50 and the circuit board 1, and improving the current carrying capacity of the power conversion device 100.
[0091] As shown in Figure 2 and Figure 5 shown in the embodiments shown in Figure 2 and Figure 5 , the current output by the power device 2 can be transmitted to the power grid 300 through the switching device 50 and the plurality of copper bars 30. Among them, according to the principle of electromagnetic induction, the secondary winding 40 can generate magnetic flux and output induced current according to the current transmitted on the plurality of copper bars 30, and the induced current is transmitted to the switching device 50. The switching device 50 judges whether to turn on or off according to the size of the induced current. When the power conversion device 100 has a leakage phenomenon, there is an excessive residual current in the current transmitted on the plurality of copper bars 30, which causes the magnetic flux generated by the current transmitted on the plurality of copper bars 30 to be too large, and the induced current output by the secondary winding 40 is greater than or equal to the threshold value. The switching device 50 will be disconnected so that the power conversion device 100 stops working, thereby effectively preventing electrical accidents from occurring and improving the use safety of the power conversion device 100. The design that the cross-sectional area of the connecting portion 33 is greater than the cross-sectional area of the main body portion 31 increases the cross-sectional area of the connecting portion 33, not only improves the current-carrying capacity of the connecting portion 33 and improves the current-carrying capacity of the copper bar 30, but also increases the contact area of the connecting portion 33 and the circuit board 1, which is beneficial to reduce the contact resistance between the copper bar 30 and the circuit board 1, and is beneficial to improve the current-carrying efficiency of the copper bar 30 and the circuit board 1, and meets the high requirements for the current-carrying capacity of the power conversion device 100.
[0092] Compared with the prior art, such a design can improve the current-carrying capacity of the copper bar 30 by only increasing the cross-sectional area of the connecting portion 33, which not only avoids increasing the cross-sectional area of the main body portion 31 to increase the size of the magnetic core 20, is beneficial to the miniaturization design of the switching device 3, and is beneficial to the miniaturization design of the power conversion device 100; and moreover, without changing other devices, the structure is simple and easy to manufacture, the application scenarios are wide, and the processing cost of the switching device 3 and the power conversion device 100 is reduced. In addition, such a design is also beneficial to increasing the contact area of the copper bar 30 and the external environment, which is beneficial to improving the heat dissipation efficiency of the copper bar 30 and the power conversion device 100.
[0093] The above embodiment specifically describes the scene that the connecting portion 33 is inserted into the circuit board 1, and next, the scene that the connecting portion 33 is located outside the circuit board 1 and in contact with the surface of the circuit board 1 is specifically described.
[0094] Please refer to Figure 11 , and in combination with Figure 9 , Figure 11 is another structure diagram of the power conversion device 100 provided by the embodiment of the application.
[0095] As shown in Figure 9 andFigure 11 As shown in the embodiment, Figure 11 The embodiment shown is similar in structure to the embodiment shown in Figure 9 The difference between the two is that the mounting relationship of the connecting portion 33 with the circuit board 1 is different. Specifically, in the embodiment shown, Figure 11 In the embodiment shown, the circuit board 1 is not provided with the insertion hole 101. The connecting portion 33 is located outside the circuit board 1. The connecting portion 33 includes a mating end face 331 in contact with the circuit board 1, and the mating end face 331 is laminated with the surface of the circuit board 1 in the first direction (i.e., the Z-axis direction). Specifically, the mating end face 331 is fixedly laminated with the first face 102 of the circuit board 1. When the connecting portion 33 is located outside the circuit board 1, the design that the mating end face 331 is laminated with the surface of the circuit board 1 in the Z-axis direction (i.e., the first direction) is conducive to increasing the contact area of the connecting portion 33 with the circuit board 1, reducing the contact resistance of the copper bar 30 with the circuit board 1, improving the current-carrying efficiency of the copper bar 30 with the circuit board 1, and improving the current-carrying capacity of the power conversion device 100.
[0096] Please refer to Figure 12 and Figure 13 , in combination with Figure 9 and Figure 11 , Figure 12 is another structural schematic diagram of a power conversion device 100 provided by the embodiment. Figure 13 is Figure 12 is an enlarged view of the XI I I part of the power conversion device 100 shown.
[0097] As shown in Figure 11 , Figure 12 and Figure 13 , Figure 12 The embodiment shown is similar in structure to the embodiment shown in Figure 11 The difference between the two is that the mounting relationship of the connecting portion 33 with the circuit board 1 is different. Specifically, in the embodiment shown, Figure 12 In the embodiment shown, the circuit board 1 is also provided with the insertion hole 101. In the Z-axis direction, the one end of the mating end face 331 towards the circuit board 1 is provided with an insertion protrusion 34, which is inserted into the insertion hole 101 along the Z-axis direction (i.e., the first direction), and the insertion protrusion 34 is in contact with the hole wall of the insertion hole 101. Through the insertion of the insertion protrusion 34 and the insertion hole 101, the connecting portion 33 is in contact with and fixedly connected with the circuit board 1. Through the insertion of the insertion protrusion 34 and the insertion hole 101, the connecting portion 33 is in contact with and fixedly connected with the circuit board 1, which is simple and stable in structure, and is easy to design, and is conducive to reducing the processing cost of the power conversion device 100.
[0098] For example, the insertion protrusion 34 is a cylinder, and the insertion hole 101 is a circular hole. The structure of the insertion hole 101 can refer to Figure 9The embodiment shown in the description will not be described again. Among them, the insertion hole 101 includes a bottom wall 1011 and a side wall 1012. The insertion protrusion 34 is in contact with and fixedly connected to the bottom wall 1011 and the side wall 1012 of the insertion hole 101. It can be understood that in this case, the matching end face 331 can only be in contact with the first surface 102 of the circuit board 1, that is, the matching end face 331 can not be directly fixedly connected to the first surface 102.
[0099] In Figure 12 In the embodiment shown in the description, the cross-sectional area of the insertion protrusion 34 is smaller than the cross-sectional area of the connecting portion 33, and the cross-section of the insertion protrusion 34 is perpendicular to the Z-axis direction (i.e. the first direction). The cross-sectional area of the insertion protrusion 34 is smaller than the cross-sectional area of the connecting portion 33, which is beneficial to reduce the size of the insertion hole 101, improve the strength of the circuit board 1, and improve the structural stability of the power conversion device 100.
[0100] Further, the cross-sectional area of the insertion protrusion 34 is greater than the cross-sectional area of the main body portion 31. The design that the cross-sectional area of the insertion protrusion 34 is greater than the cross-sectional area of the main body portion 31 is beneficial to improve the current-carrying capacity of the insertion protrusion 34, the copper bar 30, and the contact area between the insertion protrusion 34 and the circuit board 1, reduce the contact resistance between the insertion protrusion 34 and the circuit board 1, improve the current-carrying efficiency of the copper bar 30 and the circuit board 1, and improve the current-carrying capacity of the power conversion device 100.
[0101] Please refer to Figure 14 , and combine Figure 11 , Figure 14 is another structural schematic diagram of a power conversion device 100 provided by the embodiment of the present application.
[0102] As Figure 11 and Figure 14 shown, Figure 14 The embodiment shown in the description is similar in structure to the embodiment shown in Figure 11 The difference between the two is that the connecting portion 33 in the above embodiment is an integral structure, while in the embodiment shown in Figure 14 The connecting portion 33 can include a connecting sub-portion 333 and a connecting sleeve 334 in the embodiment shown in the description. The connecting sub-portion 333 is fixedly connected to one end of the intermediate portion 32, and the connecting sleeve 334 is sleeved outside the connecting sub-portion 333. Both the connecting sub-portion 333 and the connecting sleeve 334 are in contact with and fixedly connected to the circuit board 1. Specifically, both the connecting sub-portion 333 and the connecting sleeve 334 are in contact with and fixedly connected to the first surface 102. That is, the connecting portion 33 can increase the cross-section by sleeving the connecting sleeve 334 outside the connecting sub-portion 333. Specifically, the connecting sleeve 334 is consistent with the material of the connecting sub-portion 333.
[0103] The connecting part 33 comprises a connecting sub-part 333 and a connecting sleeve 334. The connecting sub-part 333 is fixedly connected with one end of the intermediate part 32. The connecting sleeve 334 is sleeved outside the connecting sub-part 333. By replacing the connecting sleeve 334 with different sizes, the cross-sectional area of the connecting part 33 can be controlled, the current-carrying capacity of the copper bar 30 and the contact resistance between the copper bar 30 and the circuit board 1 can be controlled, so as to meet the requirement of the current-carrying capacity of the power conversion device 100, and the difficulty of adjusting the cross-sectional area of the connecting part 33 is reduced. The cross-sectional area of the connecting part 33 is adjusted according to the requirement of the current-carrying capacity of the power conversion device 100, which is beneficial to reducing the processing cost of the switch device 3 and the power conversion device 100.
[0104] It can be understood that Figure 14 The design of the connecting part 33 comprising the connecting sub-part 333 and the connecting sleeve 334 in the illustrated embodiment can be applied to Figures 2-13 any one of the embodiments illustrated.
Claims
1. A power conversion device, characterized by, The power conversion device comprises: a circuit board; a power device, in a first direction, the power device is arranged on one side of the circuit board, the first direction is the thickness direction of the circuit board; and a switching device, the switching device comprises a magnetic core, a plurality of copper bars, a secondary winding and a switching device; in the first direction, the magnetic core is located on one side of the circuit board; each of the copper bars is used to connect one phase of a power grid to transmit power of the power conversion device to the power grid; wherein each of the copper bars comprises a main body part, an intermediate part and a connecting part, the main body part and the connecting part are connected through the intermediate part, the main body part passes through the magnetic core as a primary winding along a second direction, and the connecting part extends along the first direction and is in contact with and fixedly connected to the circuit board; the first direction and the second direction are perpendicular to each other; the secondary winding is wound on the magnetic core; the switching device is electrically connected to the power device, the secondary winding and the connecting part of each of the copper bars, and the switching device is used to disconnect the power device from the power grid when an induced current of the secondary winding is greater than or equal to a threshold value; wherein the cross-sectional area of the connecting part is greater than the cross-sectional area of the main body part, wherein the cross section of the connecting part is perpendicular to the first direction, and the cross section of the main body part is perpendicular to the second direction.
2. The power conversion device of claim 1, wherein, The connecting part comprises a matching end face in contact with the circuit board, and the matching end face is laminated with a surface of the circuit board in the first direction.
3. The power conversion device of claim 2, wherein, The circuit board is further provided with a plug-in hole, and the matching end face is provided with a plug-in protrusion facing one end of the circuit board, and the plug-in protrusion is inserted into the plug-in hole along the first direction.
4. The power conversion device of claim 3, wherein, The cross-sectional area of the plug-in protrusion is greater than the cross-sectional area of the main body part.
5. The power conversion device of claim 1, wherein, The circuit board is further provided with a plug-in hole, and the plug-in hole extends along the first direction, and the connecting part is at least partially inserted into the plug-in hole and in contact with a hole wall of the plug-in hole.
6. The power conversion device of claim 1, wherein, The connecting part comprises a connecting sub-part and a connecting sleeve, the connecting sub-part is fixedly connected to one end of the intermediate part, and the connecting sleeve is sleeved on the outside of the connecting sub-part.
7. The power conversion device according to any one of claims 1 to 6, characterized by, The switching device further comprises a housing, and the housing comprises a first housing part; the first housing part has a through hole along the second direction, the main body part is received in the through hole, the magnetic core surrounds the through hole and is entirely received in the first housing part, and the switching device is partially received in the first housing part; and the connecting part is located outside the housing.
8. The power conversion device of claim 7, wherein, The housing further comprises a second housing part, and the second housing part is used to receive at least part of the intermediate part; the second housing part has a plurality of openings, and each of the intermediate parts passes through a corresponding opening to be connected to the connecting part.
9. The power conversion device of claim 8, wherein, In the first direction, at least one of the plurality of openings is located on a surface of the second housing part facing the circuit board, one end of the intermediate part is exposed outside the second housing part from the opening, and the connecting part is located on one side of the second housing part facing the circuit board.
10. The power conversion device of claim 8, wherein, At least one of the plurality of openings is located on a surface of the second housing part parallel to the first direction, and one end of the intermediate part penetrates the second housing part from the opening and is connected to the connecting part.
11. Power conversion device according to any of claims 8 to 10, characterized in that The cross-sectional area of at least part of the intermediate part located outside the second housing part is greater than or equal to the cross-sectional area of the main part.
12. The power conversion device according to any one of claims 1 to 6, characterized by The connecting parts of the plurality of copper bars are spaced apart from each other by at least a first distance.
13. A switching device for mounting on a circuit board, characterized by The switch device comprises a magnetic core, a plurality of copper bars, a secondary winding and a switching device; in a first direction, the magnetic core is located on one side of the circuit board, and the first direction is the thickness direction of the circuit board; wherein each of the copper bars comprises a main part, an intermediate part and a connecting part, the main part and the connecting part are connected through the intermediate part, the main part serves as a primary winding and penetrates the magnetic core along a second direction, and the connecting part extends along the first direction and is in contact with and fixed to the circuit board; the first direction and the second direction are perpendicular to each other; The secondary winding is wound on the magnetic core; the switching device is electrically connected to the secondary winding and the connecting part of each copper bar; wherein the cross-sectional area of the connecting part is greater than the cross-sectional area of the main part, wherein the cross-sectional area of the connecting part is perpendicular to the first direction, and the cross-sectional area of the main part is perpendicular to the second direction.