Charging machine switch tube grounding structure and vehicle-mounted charging machine
By designing a shorter switch tube grounding path in the vehicle charger and setting a buffer section, the power loss problem caused by the long switch tube grounding path is solved, and the effect of reducing losses and protecting components is achieved.
Patent Information
- Application Number
- CN202510583439.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-07
- Publication Date
- 2025-07-29
AI Technical Summary
In the prior art, the grounding path of the switch tube in the on-board charging module is too long, resulting in large power loss.
A grounding structure of the charger switch tube is designed. By directly connecting the bottom end of the switch tube to the casing, a shorter electrical path is formed by using a grounding device, and a buffering part is provided in the grounding path to buffer mechanical stress. The grounding device is a sheet metal component and the buffering part is a detour bent part.
It effectively reduces the power loss of the grounding path and avoids damage to the substrate and other components by the buffering part.
Smart Images
Figure CN120389255A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of electrical appliance grounding, and particularly relates to a grounding structure for a switch tube of a charger and a vehicle-mounted charger. Background Art
[0002] The switch tubes in a vehicle-mounted charging module are usually integrated on a substrate. To ground the switch tubes, the current technical solution is: connecting them to the grounding end of the PBC circuit board through a long bus bar, thereby forming a grounding path for the switch tubes to achieve grounding. Although the grounding of the switch tubes can be achieved, in the actual use process, the bus bar will heat up, resulting in losses. Therefore, the longer the grounding bus bar path, the more losses will be generated. Thus, a grounding structure that can both achieve the grounding of the switch tubes and reduce the losses due to the bus bar path is needed. Summary of the Invention
[0003] To solve the problem of large power losses caused by the long grounding path of the switch tubes, the present invention proposes a grounding structure for a switch tube of a charger, which can connect the bottom end of the switch tube to the chassis nearby, thereby reducing the grounding path and power losses.
[0004] The technical solution adopted by the present invention is to design a grounding structure for a switch tube of a charger, including at least one switch tube disposed on a substrate. The substrate is a vertical substrate, and a grounding device is provided on the substrate. The grounding device includes a first connection end for electrically connecting to the grounding end of the switch tube and a second connection end for electrically connecting to the chassis of the charger. A buffer portion is provided between the first connection end and the second connection end, and the grounding device forms an electrical path between the switch tube and the chassis.
[0005] In some embodiments, the grounding device is a sheet metal part, and the buffer portion is a tortuous bending portion on the sheet metal part.
[0006] In some embodiments, a first bus bar is provided on the substrate, and the grounding device is electrically connected to the grounding end of the switch tube through the first bus bar or other electrical paths.
[0007] In some embodiments, a screw hole for connecting to the chassis is provided at the second connection end of the grounding device.
[0008] In some embodiments, at least two grounding devices are provided on the substrate, and different grounding devices are electrically connected through a second bus bar provided on the substrate.
[0009] In some embodiments, the second bus bar includes a plurality of spaced-apart bus bar segments.
[0010] In some embodiments, a spare grounding device is further provided on the substrate, and the spare grounding device is electrically connected to the grounding device through a third bus bar.
[0011] In some embodiments, the second bus bar and the third bus bar are fixed along the side of the substrate.
[0012] A vehicle-mounted charger includes a housing and the grounding structure of the charger switch tube, and the second connection end is connected to the housing.
[0013] In some embodiments, a circuit board is further included. The grounding device includes a connection pin for connecting to the grounding end of the charger circuit board, and the connection pin is connected to the circuit board.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] The present invention provides a grounding device. One end of the grounding device is connected to the housing of the vehicle-mounted charger, and the other end is connected to the grounded end of the aggregated switch tubes, forming a grounding path of "switch tube - bus bar - grounding device - housing" to achieve the grounding of the switch tube. Compared with the grounding path of the prior art, the grounding path of the present invention is shorter, which can effectively reduce the loss of the grounding path. The grounding device of the present invention is a sheet metal part, and the middle part of the sheet metal part has a circuitous bending part to form a buffer part. The buffer part can buffer stress and avoid damage to the substrate and other components caused by mechanical stress. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings. For the purpose of showing details and facilitating the understanding of its principle, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them:
[0017] Figure 1 is a perspective schematic diagram of the grounding device.
[0018] Figure 2 is a side view schematic diagram of the grounding device.
[0019] Figure 3 is Figure 2 a right view schematic diagram of
[0020] Figure 4 is Figure 2 a top view schematic diagram of
[0021] Figure 5 is a schematic diagram of Embodiment 1.
[0022] Figure 6 is a schematic diagram of Embodiment 2.
[0023] Figure 7 It is a schematic diagram of the third embodiment.
[0024] Figure 8 It is a schematic diagram of the grounding structure of the switching tube of the charger in the third embodiment provided on the charger.
[0025] Figure 9 is Figure 8 The cross-sectional schematic diagram at the grounding device of.
[0026] In the figure, 1a is the first busbar; 1b is the second busbar; 1c is the third busbar; 2 is the connection pin; 3 is the grounding device; 3a is the first connection end; 3b is the second connection end; 3c is the buffer part; 3d is the screw hole; 6 is the first standby grounding device; 4 is the housing; 5 is the substrate. Detailed implementation mode
[0027] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments, and the following embodiments do not limit the invention involved in the claims. In addition, all combinations of the features described in the embodiments are not necessarily essential to the solution of the invention.
[0028] The principle and structure of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0029] Embodiment 1
[0030] The switching tube in the on-vehicle charger is one of the key components in the power electronics system and is usually used to achieve power conversion and regulation. In the on-vehicle charger, the main function of the switching tube is to control the on-off of the current, so as to achieve efficient DC or AC conversion. The grounding of the switching tube plays a crucial role in the power electronics circuit. Especially in the high-frequency switching circuit, a reasonable grounding design can improve the stability of the system, reduce noise, and reduce electromagnetic interference, etc. However, since the busbar will heat up and cause losses during actual use, the longer the grounding busbar path, the more losses will be generated. Therefore, there is currently a need for a grounding structure that can both achieve the grounding of the switching tube and reduce the losses caused by the busbar path.
[0031] As Figure 5 shown, a grounding structure of a charger switching tube, the switching tube Q is arranged on the substrate 5. The substrate 5 can be an aluminum substrate, a ceramic substrate or other substrates, and is mainly used for the heat dissipation of the switching tube. The substrate in this embodiment is a vertical aluminum substrate. The grounding device 3 is arranged on the substrate, as Figure 1 , 2As shown in Figures 3 and 4, the substrate is a vertical substrate, perpendicular to or at a certain angle to the bottom of the charger housing. The grounding device 3 includes a first connection end 3a for electrically connecting to the ground terminal of the switch tube Q, and a second connection end 3b for electrically connecting to the charger housing. A buffer portion 3c is provided between the first connection end 3a and the second connection end 3b. The grounding device 3 forms an electrical path between the switch tube Q and the housing 4, thereby forming a grounding path, thereby achieving grounding of the switch tube Q. Compared with the grounding path of the prior art, the grounding path of the present invention is shorter, which can effectively reduce grounding path losses.
[0032] Tolerances are inevitable during the installation process, so stress is generated when connecting the second connection end 3b to the housing 4. The buffer portion 3c buffers this stress, preventing mechanical stress from damaging the base plate 5 and other components. The grounding device 3 is a sheet metal component, and the buffer portion 3c is a curved bend located on the sheet metal component. The second connection end 3b is provided with a screw hole 3d for connecting to the housing 4, facilitating screw connection. The first connection end of the grounding device 3 is welded to the base plate 5.
[0033] The substrate is provided with a first bus bar 1a, and the grounding device is electrically connected to the ground terminal of the switch tube via the first bus bar 1a. The grounding device can also be electrically connected to the ground terminal of the switch tube via other electrical paths, such as conductive wires or conductive coatings.
[0034] In this embodiment, the aluminum substrate patch is equipped with eight switching transistors, namely Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8. These eight switching transistors are located on both sides of the first bus bar 1a, that is, four of these switching transistors are arranged in an upper and lower arrangement on each side of the first bus bar 1a. The first backup grounding device 6 and the first bus bar 1a are both fixed to a substrate 5. The housing is, for example, the housing 4 of a charger.
[0035] The first connection end 3a of the grounding device 3 is connected to one end of the first busbar 1a; the second connection end 3b of the grounding device 3 is connected to the housing 4. The grounding end of the switching tube is connected to the first busbar 1a. The switching tube Q, the busbar 1a, and the first connection end 3a of the grounding device 3 are all welded to the substrate 5. This establishes an electrical connection from the switching tube to the first busbar 1a to the grounding device 3 to the housing 4, thereby forming a grounding path.
[0036] The installation method is as follows: Step 1: Weld the first connection end 3a to the substrate 5 at one end of the first bus bar 1a to achieve the connection between the grounding device 3 and the first bus bar 1a;
[0037] Step 2: Place the substrate 5 welded with the grounding device 3 at the corresponding position on the chassis 4, so that the screw holes on the second connection end 3b correspond to the preset screw holes on the chassis 4;
[0038] Step 3: Screw the second connection end 3b to the chassis 4 to realize the connection between the grounding device 3 and the chassis 4.
[0039] During the installation process, tolerances are inevitably present. Therefore, stress will be generated when connecting the second connection end 3b to the chassis 4. The buffer portion 3c can buffer the stress and prevent mechanical stress from damaging the substrate 5 and other components.
[0040] Embodiment 2
[0041] As Figure 6 shown, at least two of the grounding devices are provided on the substrate. In this embodiment, there are two grounding devices. Different grounding devices are electrically connected through the second bus bar 1b provided on the substrate 5. The two grounding devices are connected to the chassis 4 at two different positions respectively, so as to prevent the switch tube from not being grounded due to the failure of one grounding device 3. For the convenience of description, the grounding device farther from the first bus bar 1a is defined as the first standby grounding device 6. In this embodiment, a grounding device 3 and a first standby grounding device 6 are provided on the substrate 5, and the second bus bar 1b welded on the substrate is used. The second bus bar 1b includes a plurality of bus bar segments arranged at intervals, such as Figure 6 the bus bar segments 1b1, 1b2, 1b3, and 1b4 shown in
[0042] to form a first standby grounding path. Of course, the second bus bar 1b can also be an integral strip structure.
[0043] The first standby grounding device 6 is welded to one end of the second bus bar 1b to realize the electrical connection of "switch tube - first bus bar 1a - second bus bar 1b - first standby grounding device 6 - chassis", thereby forming a first standby grounding path.
[0044] Since the first standby grounding path is longer than the first grounding path, the conductivity of the first standby grounding path is weaker than that of the first grounding path. Therefore, when the grounding device 3 can normally realize the grounding function, the first standby grounding path hardly undertakes the grounding function. Only when the grounding device 3 is abnormal will the first standby grounding path undertake the grounding function.
[0045] Embodiment 3
[0046] As Figure 7 、8 As shown in Fig. 9, it further includes a second standby grounding device, and the second standby grounding device is electrically connected to the first standby grounding device 6 through a third bus bar 1c. The second standby grounding device, the grounding device 3, the first standby grounding device 6, the first bus bar 1a, the second bus bar 1b, and the third bus bar 1c are all fixed on the same substrate 5. The second standby grounding device includes a connection pin 2 for connecting to the grounding end of the charger circuit board.
[0047] The third bus bar 1c and the connection pin 2 are soldered on the substrate 5. One end of the third bus bar 1c is soldered to one end of the second bus bar 1b (specifically, the bus bar section 1b4), and the other end of the third bus bar 1c is connected to the connection pin 2. The connection pin 2 is also used to connect to the PCB circuit board. The electrical connection of "switch tube - first bus bar 1a - second bus bar 1b - third bus bar 1c - connection pin - circuit board" is realized, thereby forming a second standby grounding path.
[0048] Since the second standby grounding path is longer than the first grounding path and the first standby grounding path, the conductivity of the second standby grounding path is weaker than that of the first grounding path and the first standby grounding path. Therefore, when the grounding device 3 or the first standby grounding device 6 can normally achieve the grounding function, the second standby grounding path hardly undertakes the grounding function. Only when both the grounding device 3 and the standby grounding device 6 are abnormal, the second standby grounding path will undertake the grounding function.
[0049] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A grounding structure for a switching tube of a charger, including at least one switching tube disposed on a substrate (5), characterized in that, The substrate (5) is a vertical substrate, and a grounding device (3) is arranged on the substrate (5). The grounding device (3) includes a first connection end (3a) for electrically connecting to the grounding end of the switching tube and a second connection end (3b) for electrically connecting to the charger housing (4). A buffer portion (3c) is provided between the first connection end (3a) and the second connection end (3b). The grounding device (3) forms an electrical path between the switching tube and the housing (4).
2. The grounding structure of the charger switch tube according to claim 1, wherein, The grounding device (3) is a sheet metal part, and the buffer portion (3c) is a circuitous bending portion located on the sheet metal part.
3. The grounding structure of the switching tube of the charger according to claim 1, wherein, The grounding device (3) is electrically connected to the grounding end of the switching tube through a first bus bar (1a) or other electrical paths.
4. The grounding structure of the switching tube of the charger according to claim 1, wherein A screw hole (3d) for connecting the housing (4) is provided at the second connection end (3b) of the grounding device (3).
5. The grounding structure of the charger switch tube according to claim 1, wherein, At least two grounding devices (3) are arranged on the substrate (5), and different grounding devices (3) are electrically connected through a second bus bar (1b) arranged on the substrate (5).
6. The grounding structure of the charging machine switching tube according to claim 5, characterized in that The second bus bar (1b) includes a plurality of spaced bus bar segments.
7. The grounding structure of the switching tube of the charger according to claim 6, characterized in that, A spare grounding device (3) is further arranged on the substrate (5), and the spare grounding device (3) is electrically connected to the grounding device (3) through a third bus bar (1c).
8. The grounding structure of the charging machine switching tube according to claim 7, characterized in that, The second bus bar (1b) and the third bus bar (1c) are fixed along the side of the substrate (5).
9. A vehicle-mounted charger, characterized in that, It includes a housing (4) and a charger switching tube grounding structure according to any one of claims 1 to 8, and the second connection end (3b) is connected to the housing (4).
10. The on-vehicle charger according to claim 9, wherein, It further includes a circuit board. The grounding device (3) includes a connection pin (2) for connecting to the grounding end of the charger circuit board, and the connection pin (2) is connected to the circuit board.