Switching device temperature measurement structure and vehicle-mounted charger

Abstract

The utility model provides a switch device temperature measurement structure and a vehicle-mounted charger, and the structure comprises a fixed support which is provided with a through hole, at least one switch device which is electrically connected with a circuit board and is disposed at one side of the fixed support, and at least one temperature measurement device which is electrically connected with the circuit board and is disposed at the other side of the fixed support. The sensing end of the temperature measuring device extends into the through hole and is in contact with the switching device; according to the utility model, the temperature measuring device is arranged on the fixed support on which the switching device is fixed, and the temperature measuring device is in direct contact with the switching device through the through hole of the fixed support, so that the temperature measuring device can obtain the temperature of the switching device in real time, the thermal resistance is small, the conduction is fast, and the real-time performance and accuracy of the temperature measurement of the switching device are improved; therefore, by accurately monitoring the temperature of the switching device in real time, when the temperature of the switching device is too high, measures such as power derating or over-temperature protection are taken in time to protect the switching device and the vehicle-mounted power supply.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobiles, and more specifically, relates to a temperature measuring structure for a switching device and an on-vehicle charger. Background Art

[0002] With the requirements of energy conservation, emission reduction and control of air pollution, new energy vehicles are gradually being commercially used in the market, and electric vehicles are the main force of new energy vehicles. Electric vehicles are divided into pure electric vehicles and hybrid vehicles. Among them, the on-vehicle power supply is an important part of electric vehicles. The on-vehicle power supply includes, but is not limited to, an on-vehicle charger (On-Board Charger, abbreviated as OBC), a direct current-direct current converter (Direct Current-Direct Current, abbreviated as DC-DC converter), a product integrating an on-vehicle charger and a DC-DC converter, and the switching device is an important part of the on-vehicle charger and the DC-DC converter. When the on-vehicle power supply is working, a large amount of heat will be generated by the switching device. If the heat cannot be quickly dissipated during operation and the temperature of the switching device is too high, it will have an adverse impact on the use and life of the on-vehicle power supply.

[0003] The existing on-vehicle power supply measures the temperature of the switching device through a temperature measuring device. If the temperature is too high, measures such as power derating or over-temperature protection are taken to protect the switching device and the on-vehicle charger. However, the temperature measuring device used to measure the temperature of the switching device in the existing on-vehicle power supply is arranged on the circuit board, and there is a certain distance between the temperature measuring device and the switching device tube. A part of the heat generated when the switching device works is conducted to the temperature measuring device through air, and another part is conducted to the temperature measuring device through the pins of the switching device and the circuit board. Since the heat generated by the switching device is conducted through air and the pins and circuit board of the switching device, the thermal resistance is large and the time is long, resulting in untimely measurement of the temperature by the temperature measuring device and low real-time performance of temperature monitoring. At the same time, the heating elements near the temperature measuring device in the on-vehicle power supply will also conduct heat through air, resulting in inaccurate measurement of the temperature by the temperature measuring device and low accuracy.

[0004] Therefore, how to design a structure that can accurately measure the temperature of the switching device in real time and take measures such as power derating or over-temperature protection for the on-vehicle power supply according to the temperature of the switching device is a technical problem urgently to be solved in the industry. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a temperature measuring structure for a switching device and an on-vehicle charger to solve the problem in the prior art that the temperature of the switching device cannot be measured accurately in real time.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The present utility model provides a temperature measuring structure for a switching device, comprising: a fixed bracket with a through hole formed therein, at least one switching device electrically connected to a circuit board and disposed on one side of the fixed bracket, and at least one temperature measuring device electrically connected to the circuit board and disposed on the other side of the fixed bracket, wherein an induction end of the temperature measuring device extends into the through hole to contact the switching device.

[0008] Further, the fixed bracket includes side plates and an upper top plate, the side plates are formed with the through hole, the switching device and the temperature measuring device are mounted on two sides of the side plates, and both sides of the upper top plate are respectively provided with pin slots for fixing the switching device and pin holes for fixing the temperature measuring device.

[0009] Further, the upper top plate includes a first upper top plate formed with the pin slots and a second upper top plate formed with the pin holes, the first upper top plate is disposed at the top of one side of the side plate where the switching device is mounted, and the second upper top plate is disposed at the top of the other side of the side plate where the temperature measuring device is mounted.

[0010] Further, pins of the temperature measuring device extend toward the second upper top plate after being bent multiple times and pass through the pin holes.

[0011] Further, an edge shape of one end of the second upper top plate where the pin holes are formed is arc-shaped.

[0012] Further, an isolation groove is formed at the top of one end of the second upper top plate where the pin holes are formed.

[0013] Further, positioning feet are provided at both ends of the fixed bracket for positioning the fixed bracket in a housing of a vehicle-mounted charger.

[0014] The present utility model further provides a vehicle-mounted charger, comprising: the circuit board, a housing with an open end, a flow channel side wall disposed in the housing and enclosing a coolant flow channel with the housing, a pressing member, and the temperature measuring structure for the switching device as described above disposed in the housing;

[0015] The circuit board is located at the open end of the housing, and the pressing member abuts one side of the fixed bracket in the temperature measuring structure for the switching device where the switching device is disposed against the flow channel side wall.

[0016] Further, the pressing member includes a pressing and fixing portion, a pressing and abutting portion, and a pressing connection portion for connecting the pressing and fixing portion and the pressing and abutting portion. The pressing and fixing portion is fixedly connected to the housing by screws. The pressing and abutting portion includes a first bent portion bent toward the fixed bracket and a second bent portion bent away from the fixed bracket. The connection portion between the first bent portion and the second bent portion abuts against the fixed bracket.

[0017] Further, an insulating member is provided between the pressing member and the temperature measuring device. The insulating member includes an insulating fixing portion and an insulating bent portion. The insulating fixing portion is pressed against the fixed bracket through the connection portion between the first bent portion and the second bent portion. The insulating bent portion is located between the temperature measuring device and the first bent portion.

[0018] The beneficial effects of the switch device temperature measuring structure and the on-vehicle charger provided by the present utility model are as follows: Compared with the prior art, by arranging a temperature measuring device on the fixed bracket where the switch device is fixed, the temperature measuring device is in direct contact with the switch device through the through hole of the fixed bracket, enabling the temperature measuring device to obtain the temperature of the switch device in real time, with small thermal resistance and fast conduction, improving the real-time performance and accuracy of the temperature measurement of the switch device. Thus, by monitoring the temperature of the switch device in real time and accurately, measures such as power derating or over-temperature protection can be taken in a timely manner when the temperature of the switch device is too high to protect the switch device and the on-vehicle power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is an exploded schematic view of the switch device temperature measuring structure provided by the embodiment of the present utility model;

[0021] Figure 2 is a schematic structural view of the switch device temperature measuring structure provided by the embodiment of the present utility model;

[0022] Figure 3 is a top view of the switch device temperature measuring structure provided by the embodiment of the present utility model;

[0023] Figure 4 is a cross-sectional schematic view of the switch device temperature measuring structure provided by the embodiment of the present utility model;

[0024] Among them, the main reference signs in the drawings are as follows:

[0025] 1. Fixed bracket; 11. Upper top plate; 111. Pin slot; 112. Pin hole; 113. First upper top plate; 114. Second upper top plate; 115. Isolation slot; 12. Side plate; 121. Through hole; 13. Positioning foot; 2. Switch device; 3. Temperature measuring device; 4. Pressing member; 41. First bending portion; 42. Second bending portion; 421. Pressure regulating hole; 43. Pressing connection portion; 44. Pressing fixing portion; 441. Connection hole; 442. Positioning hole; 45. Screw; 5. Insulating member. Detailed implementation manner

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] The on-vehicle charger provided by the present utility model includes a housing, a circuit board, a flow channel side wall and a switch device temperature measuring structure. Among them, as Figure 1 and Figure 2 shown, the switch device temperature measuring structure includes a fixed bracket 1 integrated with a switch device 2 and a temperature measuring device 3.

[0028] It should be noted that the top of the housing is set as an open end, and the circuit board is located at the open end of the housing. The flow channel side wall is arranged inside the housing and encloses a coolant flow channel with the housing. The fixed bracket 1 is arranged inside the housing, and the fixed bracket 1 is arranged on one side of the flow channel side wall. The switch device 2 and the temperature measuring device 3 are respectively electrically connected to the circuit board. The coolant flowing in the coolant flow channel of the present utility model can be cooling water or other cooling media. The switch device 2 can be, but is not limited to, a MOS tube, and the temperature measuring device 3 can be, but is not limited to, an NTC resistor.

[0029] As Figure 1 and Figure 2 shown, the fixed bracket 1 is provided with a through hole 121. The switch device 2 is arranged on one side of the fixed bracket 1, and the temperature measuring device 3 is arranged on the other side of the fixed bracket 1. At the same time, the sensing end of the temperature measuring device 3 extends into the through hole 121 to contact the switch device 2.

[0030] The present utility model provides a fixed bracket 1 integrated with a switch device 2 and a temperature measuring device 3. The temperature measuring device 3 is in direct contact with the switch device 2 through the through hole 121 of the fixed bracket 1, so that the temperature measuring device 3 can obtain the temperature of the switch device 2 in real time. The thermal resistance is small and the conduction is fast, which improves the real-time performance and accuracy of the temperature measurement of the switch device 2. Therefore, by monitoring the temperature of the switch device 2 in real time and accurately, measures such as power derating or over-temperature protection can be taken in time when the temperature of the switch device 2 is too high to protect the switch device 2 and the on-vehicle power supply.

[0031] In a preferred embodiment, as Figure 1 and Figure 2 shown, the fixing bracket 1 includes a side plate 12 and an upper top plate 11. The side plate 12 is provided with a through hole 121. The switching device 2 and the temperature measuring device 3 are installed on both sides of the side plate 12. The upper top plate 11 is perpendicularly connected to the side plate 12. On both sides of the upper top plate 11, there are respectively a pin slot 111 for fixing the pins of the switching device 2 and a pin hole 112 for fixing the pins of the temperature measuring device 3.

[0032] The upper top plate 11 includes a first upper top plate 113 provided with a pin slot 111 and a second upper top plate 114 provided with a pin hole 112. The first upper top plate 113 is arranged on the top of the side of the side plate 12 where the switching device 2 is installed, and the second upper top plate 114 is arranged on the top of the other side of the side plate 12 where the temperature measuring device 3 is installed. The pins of the switching device 2 pass through the pin slot 111 of the first upper top plate 113 to be electrically connected to the circuit board, and the pins of the temperature measuring device 3 pass through the pin hole 112 of the second upper top plate 114 to be electrically connected to the circuit board.

[0033] By providing a pin slot 111 for placing the pins of the switching device 2 on the first upper top plate 113, the positioning of the switching device 2 is achieved when the pins of the switching device 2 are soldered to the circuit board, and by providing a pin hole 112 for placing the pins of the temperature measuring device 3 on the second upper top plate 114, the positioning of the temperature measuring device 3 is achieved when the pins of the temperature measuring device 3 are soldered to the circuit board.

[0034] To achieve the positioning of the fixing bracket 1, the bottom of the side plate 12 is provided with positioning feet 13 for positioning the fixing bracket 1 when it is placed in the housing. The number of the positioning feet 13 can be set to two, and the two positioning feet 13 are arranged at both ends of the bottom of the side plate 12.

[0035] In a preferred embodiment, as Figure 1 and Figure 2 shown, the fixing bracket 1 is pressed against one side of the side wall of the flow channel by a pressing member 4. The pressing member 4 includes a pressing and fixing portion 44, a pressing and abutting portion, and a pressing connection portion 43 for connecting the pressing and fixing portion 44 and the pressing and abutting portion. The pressing and fixing portion 44 is fixedly connected to the housing by a screw 45. The pressing and abutting portion includes a first bending portion 41 bent towards the direction close to the fixing bracket 1 and a second bending portion 42 bent towards the direction away from the fixing bracket 1. The connection portion between the first bending portion 41 and the second bending portion 42 abuts against the fixing bracket 1, so as to tightly press the side of the fixing bracket 1 where the switching device 2 is located against the side wall of the flow channel, thereby making the switching device 2 fit against the side wall of the flow channel and improving the heat dissipation effect of the switching device 2. Of course, in other embodiments, it can be set that the fixing bracket 1 is fixed on the side wall of the flow channel by an adhesive connection method, and the pressing member 4 can be omitted.

[0036] The pressing and fixing portion 44, the pressing and abutting portion, and the pressing and connecting portion 43 of the pressing member 4 are integrally formed, that is, the first bending portion 41, the second bending portion 42, the pressing and connecting portion 43, and the pressing and fixing portion 44 are integrally formed. The material of the pressing member 4 is selected as an elastic material, and the elastic force of the pressing member 4 causes the switching device 2 and the fixing bracket 1 to be pressed against the side wall of the flow channel. The material of the fixing bracket 1 is selected as an insulating material such as plastic to insulate the switching device 2 from the pressing member 4. At the same time, the fixing bracket 1 can also protect the switching device 2 to prevent the pressing member 4 from directly contacting the switching device 2 and prevent the pressing member 4 from damaging the switching device 2.

[0037] The bending radian sizes of the first bending portion 41 and the second bending portion 42 can be reasonably designed according to actual pressing force requirements. In addition, a pressure regulating hole 421 is provided in the first bending portion 41 and / or the second bending portion 42. The pressure regulating hole 421 is used to control the pressing force of the pressing member 4 against the fixing bracket 1, and the shape of the regulating hole can be circular, elliptical, rectangular, or triangular. As an example, as Figure 1 shown, the first bending portion 41 is provided with an elliptical pressure regulating hole 421, and the second bending portion 42 is provided with a pressure regulating hole 421 in an inverted triangular shape. By providing the pressure regulating holes 421 in the first bending portion 41 and the second bending portion 42, the pressing force of the pressing member 4 against the fixing bracket 1 can be controlled, so that while the fixing bracket 1 is tightly attached to the side wall of the flow channel, the fixing bracket 1 will not be damaged due to excessive pressing force.

[0038] The pressing and fixing portion 44 is provided with a connection hole 441 and a positioning hole 442. The connection hole 441 is used for the screw 45 to pass through, so that the pressing member 4 is fixedly connected to the housing through the screw 45, and then the pressing member 4 is installed in the housing. The positioning hole 442 is used for a positioning pin provided in the housing to pass through to position the pressing member 4 when the pressing member 4 is arranged in the housing.

[0039] The number of the pressing and abutting portions can be set to multiple, and the multiple pressing and abutting portions are arranged at intervals, so as to improve the elastic deformation ability of the pressing member 4 and also adapt to the uneven surface of the fixing bracket 1.

[0040] Correspondingly, one side of the fixing bracket 1 is provided with a plurality of elastic bearing positions corresponding to the plurality of pressing and abutting portions. When the elastic bearing positions are pressed by the corresponding pressing and abutting portions, they are deformed, so that the pressing and abutting portions are closely attached to the fixing bracket 1, and the switching device 2 and the fixing bracket 1 are better pressed against the side wall of the flow channel. In addition, heat dissipation grids are provided in the elastic bearing positions to improve the heat dissipation performance. A plurality of process holes are provided at the edge near the bottom of one side of the fixing bracket 1.

[0041] As an example, as Figure 1 and Figure 2As shown, the pressing member 4 includes a pressing and fixing portion 44, four pressing and abutting portions, and a pressing connection portion 43 for connecting the four pressing and abutting portions to a pressing and fixing portion 44. The pressing and fixing portion 44 is provided with three connecting holes 441 arranged at intervals and two positioning holes 442 arranged at intervals.

[0042] In a preferred embodiment, as Figure 1 and Figure 2 shown, an insulating member 5 is provided between the pressing member 4 and the temperature measuring device 3. The insulating member 5 includes an insulating fixing portion and an insulating bending portion connected to the insulating fixing portion. The insulating fixing portion is pressed against the fixing bracket 1 through the connection portion of the first bending portion 41 and the second bending portion 42, and the insulating bending portion is located between the temperature measuring device 3 and the first bending portion 41.

[0043] It can be understood that according to the safety regulations requirements, the distance between the temperature measuring device 3 and the pressing member 4 should be greater than 3.2 mm. However, the pressing member 4 needs to be fixed in the middle position of the fixing bracket 1 to better fix the switching device 2. In order to measure the temperature of the switching device 2, the temperature measuring device 3 must partially overlap with the heat generating part (such as the wafer position) of the switching device 2. Therefore, the distance between the temperature measuring device 3 and the pressing member 4 is only 1.83 mm. In order not to interfere with the normal operation of the temperature measuring device 3, an insulating member 5 is provided between the temperature measuring device 3 and the pressing member 4. The insulating fixing portion of the insulating member 5 is fixed by the connection portion of the first bending portion 41 and the second bending portion 42 in the pressing member 4, and the insulating bending portion of the insulating member 5 is bent in a direction away from the fixing bracket 1, playing a role in isolating the pressing member 4 and the temperature measuring device 3.

[0044] The on-vehicle charger provided by the present utility model further includes a control unit, which monitors the temperature of the switching device 2 by being attached to the switching device 2 through the temperature measuring device 3. The temperature measurement is timely and accurate. Thus, by monitoring the temperature of the switching device 2 in real time, when the temperature of the switching device 2 is too high, the control unit takes measures such as power derating or over-temperature protection in time to protect the switching device 2 and the vehicle-mounted power supply.

[0045] The present utility model does not limit the number of the switching device 2 and the temperature measuring device 3, and can be reasonably selected according to actual application requirements. Now, several specific examples are provided for illustration:

[0046] In one example, only one switching device 2 is provided on one side of the fixing bracket 1, and only one temperature measuring device 3 is provided on the other side of the fixing bracket 1, and the switching device 2 is in direct contact with the temperature measuring device 3 through the through hole 121 of the fixing bracket 1. The temperature of the switching device 2 is monitored in real time and accurately by the temperature measuring device 3, and when the temperature of the switching device 2 is too high, measures such as power derating or over-temperature protection are taken in time to protect the switching device 2 and the vehicle-mounted power supply.

[0047] In another example, six switching devices 2 are arranged side by side on one side of the fixing bracket 1, and six temperature measuring devices 3 are arranged side by side on the other side of the fixing bracket 1. The six switching devices 2 and the six temperature measuring devices 3 correspond to each other one by one, and each switching device 2 is in direct contact with the corresponding temperature measuring device 3 through the through hole 121 of the fixing bracket 1. The temperature of the corresponding switching device 2 is monitored in real time and accurately by the temperature measuring device 3. When the temperature of any one of the switching devices 2 is too high, measures such as power derating or over-temperature protection are taken in a timely manner to protect the six switching devices 2 and the vehicle-mounted power supply.

[0048] In yet another example, six switching devices 2 are arranged side by side on one side of the fixing bracket 1, and only one temperature measuring device 3 is provided on the other side of the fixing bracket 1. This temperature measuring device 3 is in direct contact with one of the six switching devices 2 through the through hole 121 of the fixing bracket 1. It should be understood that the six switching devices 2 work synchronously, and the temperatures of the six switching devices 2 are relatively close. By measuring the temperature of one of the switching devices 2, when the temperature of this switching device 2 is too high, measures such as power derating or over-temperature protection are taken in a timely manner to protect the six switching devices 2 and the vehicle-mounted power supply.

[0049] For the convenience of understanding, the following takes an example in which there is one switching device 2 and one temperature measuring device 3 provided on the fixing bracket 1 to elaborate:

[0050] As Figure 1 and Figure 4 shown, a through hole 121 penetrating through itself is provided inside the side plate 12. One side surface of the side plate 12 is closely attached to one side surface of the switching device 2. The length of the through hole 121 is less than the length of the sensing end of the temperature measuring device 3, so that a part of the sensing end of the temperature measuring device 3 extends into the through hole 121, and the other part is exposed outside, which is convenient for installing the temperature measuring device 3.

[0051] In addition, a thermal conductive adhesive is provided inside the through hole 121. The thermal conductive adhesive fills the gap part inside the through hole 121 except for the body of the temperature measuring device 3, so that the switching device 2 and the sensing end of the temperature measuring device 3 are attached and connected through the thermal conductive adhesive. The material of the thermal conductive adhesive can adopt epoxy resin material.

[0052] As Figure 1 shown, the pins of the temperature measuring device 3 are arranged in a way of being bent multiple times. After being bent multiple times, the pins of the temperature measuring device 3 extend towards the second upper top plate 114 and pass through the pin holes 112. It can be understood that in order to ensure the electrical safety distance between the pins of the temperature measuring device 3 and the pins of the temperature measuring device 3, and at the same time ensure that the pin holes 112 processed on the second upper top plate 114 have a certain strength, it is required that the distance between the pin holes 112 and the edge of the second upper top plate 114 is greater than 3 mm. However, if the second upper top plate 114 is extended, it will affect the fixing screw 45. Therefore, as Figure 1 shown, the pins of the temperature measuring device 3 are bent three times, and the pins of this temperature measuring device 3 are integrally formed.

[0053] As Figure 1 and Figure 3 shown, at one end of the second upper top plate 114 provided with the pin holes 112, an isolation groove 115 is formed at the top, and the depth of the isolation groove 115 is greater than or equal to 0.5 mm. The provision of the isolation groove 115 creates a gap between the second upper top plate 114 and the circuit board, which is conducive to heat dissipation. At the same time, the distance between the pin holes 112 and the edge of the second upper top plate 114 should be greater than 3 mm, which not only ensures a certain strength but also facilitates the machining of the pin holes 112. The pin grooves 111 on the first upper top can also create a gap between the first upper top plate 113 and the circuit board, which is conducive to heat dissipation.

[0054] As Figure 3 shown, the edge shape of one end of the second upper top plate 114 provided with the pin holes 112 is arc-shaped. This design is to avoid the installation path of the screw 45 to prevent hindering the fixing screw 45. According to the design specification requirements, the outer diameter of the screw 45 is 8 mm, and the avoidance range diameter is 12 mm.

[0055] In the utility model, a temperature measuring device is arranged on the fixing bracket fixing the switching device. The temperature measuring device is in direct contact with the switching device through the through hole of the fixing bracket, and the temperature measuring device and the switching device are bonded and connected through a heat-conducting adhesive. The temperature measuring device can obtain the temperature of the switching device in real time, with small thermal resistance and fast conduction, improving the real-time performance and accuracy of measurement. Thus, through the temperature of the switching device monitored in real time, measures such as power derating or over-temperature protection are taken in a timely manner when the temperature of the switching device is too high to protect the switching device and the vehicle-mounted power supply.

[0056] The present utility model comprehensively considers the design of the positioning structure of the temperature measuring device body (i.e., the sensing end) and the pin positioning structure, the design of the pin bending structure, the design of fixing the temperature measuring device body in the fixing bracket, the design of the insulating part, the assembly design of the temperature measuring device, the positioning of the fixing bracket in the on-vehicle charger, and the fixing of the fixing bracket. Among them, the design of the positioning structure of the temperature measuring device body and the pin positioning structure solves the positioning problem of the temperature measuring device on the fixing bracket; the design of the pin bending structure and the insulating part ensure the safe and standard distance between electrical devices in a relatively limited space, and at the same time avoid the assembly of the screws for fixing the pressing part, ensuring sufficient assembly distance when installing the screws; in the design of fixing the temperature measuring device body in the fixing bracket, the thermal conductive adhesive uses an epoxy resin material consistent with the material of the temperature measuring device body. While firmly attaching the body to the surface of the switching device, it also effectively increases the contact area between the temperature measuring device body and the switching device, enhancing heat conduction; the assembly design of the temperature measuring device makes the installation of the temperature measuring device simple and convenient. Its body is directly adhered to the surface of the switching device to directly monitor the temperature of the switching device, which is more accurate than the existing indirect temperature measurement scheme. The positioning of the fixing bracket is achieved by combining two positioning feet and a positioning surface with the positioning structure of the on-vehicle charger, limiting itself beside the temperature measurement area, which enables the heat conduction area of the switching device to effectively fit the temperature measurement area, and the temperature measuring device is in direct contact with the switching device to obtain the temperature of the switching device in real time; the fixing of the fixing bracket is realized through the pressing part and the screw. By designing the structure of the pressing part and the positioning structure on the housing, after locking the screw, the pressing part can effectively fix the fixing bracket, and the pressing force is neither too large to crush the switching device nor too small to cause the switching device to loosen under external vibration and impact.

[0057] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A temperature measurement structure for a switching device, characterized in that, Comprising: A fixed bracket (1) provided with a through hole (121), at least one switching device (2) electrically connected to a circuit board and disposed on one side of the fixed bracket (1), and at least one temperature measuring device (3) electrically connected to the circuit board and disposed on the other side of the fixed bracket (1), wherein the sensing end of the temperature measuring device (3) extends into the through hole (121) to contact the switching device (2).

2. The temperature measurement structure of the switching device according to claim 1, characterized in that, The fixed bracket (1) includes a side plate (12) and an upper top plate (11). The side plate (12) is provided with the through hole (121). The switching device (2) and the temperature measuring device (3) are installed on both sides of the side plate (12). Both sides of the upper top plate (11) are respectively provided with pin grooves (111) for fixing the switching device (2) and pin holes (112) for fixing the temperature measuring device (3).

3. The temperature measurement structure of the switching device according to claim 2, characterized in that, The upper top plate (11) includes a first upper top plate (113) provided with the pin grooves (111) and a second upper top plate (114) provided with the pin holes (112). The first upper top plate (113) is disposed on the top of the side plate (12) on the side where the switching device (2) is installed, and the second upper top plate (114) is disposed on the top of the side plate (12) on the other side where the temperature measuring device (3) is installed.

4. The temperature measurement structure of the switching device according to claim 3, characterized in that, The pins of the temperature measuring device (3) extend toward the second upper top plate (114) after being bent multiple times and pass through the pin holes (112).

5. The temperature measurement structure of the switching device according to claim 3, wherein, One end edge of the second upper top plate (114) where the pin holes (112) are provided has an arc shape.

6. The temperature measurement structure of the switching device according to claim 3, characterized in that, One end top of the second upper top plate (114) where the pin holes (112) are provided is provided with an isolation groove (115).

7. The temperature measurement structure of the switching device according to claim 1, characterized in that, Both ends of the fixed bracket (1) are provided with positioning feet (13) for positioning the fixed bracket (1) when it is disposed in the housing of the on-vehicle charger.

8. A vehicle-mounted charger, characterized in that, Comprising: A circuit board, a housing having an open end, a flow channel side wall disposed in the housing and enclosing a coolant flow channel with the housing, a pressing member (4), and a switching device temperature measuring structure as described in any one of claims 1-7 disposed in the housing; The circuit board is located at the open end of the housing, and the pressing member (4) abuts one side of the fixed bracket (1) in the switching device temperature measuring structure where the switching device (2) is provided against the flow channel side wall.

9. The on-vehicle charger according to claim 8, wherein, The pressing member (4) includes a pressing and fixing portion (44), a pressing and abutting portion, and a pressing connection portion (43) for connecting the pressing and fixing portion (44) and the pressing and abutting portion. The pressing and fixing portion (44) is fixedly connected to the housing by screws (45). The pressing and abutting portion includes a first bent portion (41) bent toward the direction close to the fixed bracket (1) and a second bent portion (42) bent toward the direction away from the fixed bracket (1). The connection portion between the first bent portion (41) and the second bent portion (42) abuts against the fixed bracket (1).

10. The on-vehicle charger according to claim 9, wherein, An insulating member (5) is provided between the pressing member (4) and the temperature measuring device (3). The insulating member (5) includes an insulating fixing portion and an insulating bending portion. The insulating fixing portion is pressed against the fixing bracket (1) through the connection portion of the first bending portion (41) and the second bending portion (42). The insulating bending portion is located between the temperature measuring device (3) and the first bending portion (41).

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