Power tube pressing block with temperature sensing function

Abstract

The utility model discloses a power tube pressing block with a temperature sensing function, which comprises a plastic shell, the inner wall of the plastic shell is provided with a pressing block contacted with the surface of a power tube, the pressing block is configured to have good heat conduction performance, the surface of the pressing block is provided with a temperature sensor, and the end part of the temperature sensor is connected with a temperature sensing signal line. According to the utility model, the structure is simple, the temperature sensor and the pressing block are combined into a whole, the temperature of the power tube is directly sensed, the temperature is more direct and accurate, the installation is simple, the cost and expense of a system are saved, the installation process is reduced, and the time is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics and power semiconductors, in particular to a power tube pressing block with a temperature sensing function. Background Art

[0002] In the existing method, the tube pressing block is only responsible for pressing the tube, and the thermistor is usually placed on the aluminum profile radiator, a certain distance away from the tube pressing block. When the thermistor and the tube pressing block are placed separately, there are disadvantages such as complex process, high installation cost, and poor temperature sensing effect.

[0003] Many manufacturers have considered the design of power tube blocks, and the following two patent documents have been retrieved:

[0004] In the patent "CN210778549U-A fixed pressure block for a MOS tube", a spring steel sheet is provided on the outer shell, a ring is installed on the top of the outer shell, a limit groove is provided on the top of the outer shell, and limit plates are installed on both sides of the ring in a symmetrical manner relative to the vertical center plane of the ring, and the limit plates are in sliding contact with the inner wall of the limit groove. The utility model adopts a split design, and the finished product is a three-in-one combination installation, with simple process, low cost, simple quality control, good insulation of the plastic shell, high strength of the spring steel sheet, which can make the MOS tube and the radiator highly fit, thereby ensuring good heat dissipation of the MOS tube, and can effectively avoid failure of the pressure block due to high temperature of the product, and has the characteristics of simple processing technology, low cost, and easy mass production. The steel sheet has high strength and good toughness, and is suitable for long-term use under high temperature.

[0005] Patent "CN202268341U-A component for fixing transistors" discloses a component for fixing transistors, including a transistor pressing plate and a printed circuit board. The transistor pressing plate is provided with a number of countersunk holes for connecting with the transistors through elastic pins. The transistor pressing plate is also provided with a number of hooks protruding therefrom. The printed circuit board is provided with a slot, and the transistor pressing plate is connected to the printed circuit board through the hooks. The component structure design of the utility model avoids the cumbersome installation and disassembly of screws, and can ensure a stable connection when the transistor is installed.

[0006] These two inventions only solve the problem of clamping the tube block, but do not explain the temperature sensing of the tube, which has certain defects. Therefore, a power tube block with temperature sensing function is proposed. Utility Model Content

[0007] The purpose of the utility model is to provide a power tube pressing block with temperature sensing function to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a power tube pressing block with temperature sensing function, comprising a plastic shell, the inner wall of the plastic shell is provided with a pressing block in contact with the surface of the power tube, the pressing block is configured to have good thermal conductivity, and a temperature sensor is provided on the surface of the pressing block, and the end of the temperature sensor is connected to a temperature sensing signal line.

[0009] As a further solution of the utility model: the power tube is welded on the surface of the PCB board, and a heat sink is provided on the end surface of the power tube away from the PCB board.

[0010] As a further solution of the utility model: a power tube is welded on the surface of the PCB board, and the plastic shell includes an upper plastic shell arranged between the PCB board and the power tube, and both sides of the inner wall of the upper plastic shell cavity are provided with clamping blocks for fixing the pressing block inside the cavity.

[0011] As a further solution of the utility model: a sleeve extending vertically upward is formed on the upper surface of the upper plastic shell, and the end of the sleeve passes through the PCB board, the sleeve includes a hollow cavity, which is symmetrically arranged on the sleeve and passes through a through hole in the upper plastic shell, and the through hole is configured to allow the temperature sensing signal line to be led out.

[0012] As a further solution of the utility model: two power tubes are welded on the surface of the PCB board, the plastic shell includes an upper plastic shell and a lower plastic shell, the upper plastic shell is arranged between the PCB board and the power tube, and a pressing block is provided inside the upper plastic shell, which contacts the surfaces of the two power tubes respectively, and a lower plastic shell is provided between the two power tubes to limit the pressing block in the upper plastic shell, and temperature sensors are installed on the surface of the pressing block at the positions of the two power tubes.

[0013] As a further solution of the utility model: a screw hole is opened in the middle of the pressing block, and the end of the screw passes through the upper plastic shell, the pressing block and the lower plastic shell.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the utility model has a novel structure, and directly senses the temperature of the power tube by combining the temperature sensor with the pressing block. The temperature is more direct and accurate, and the installation is simple, which saves the cost and expense of the system, reduces the installation process, and saves time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the first embodiment of the overall structure of the utility model;

[0016] Figure 2 For this utility model Figure 1 A side view schematic diagram of

[0017] Figure 3 For this utility model Figure 1Schematic diagram of the briquetting structure;

[0018] Figure 4 It is a schematic diagram of a second embodiment of the overall structure of the utility model;

[0019] Figure 5 For this utility model Figure 4 Schematic diagram of the interior of the upper plastic shell;

[0020] Figure 6 For this utility model Figure 4 Schematic diagram of the upper plastic shell structure;

[0021] Figure 7 For this utility model Figure 4 Schematic diagram of the briquetting;

[0022] Figure 8 This is a schematic diagram of the position distribution of the PCB board and the heat sink of the utility model;

[0023] In the figure: 1. Plastic shell; 2. Temperature sensor; 3. Power tube; 4. Press block. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-8 In an embodiment of the utility model, a power tube pressing block with a temperature sensing function comprises a plastic shell 1, an inner wall of the plastic shell 1 is provided with a pressing block 4 in contact with the surface of the power tube 3, the pressing block 4 is configured to have good thermal conductivity, and a temperature sensor 2 is provided on the surface of the pressing block 4, and a temperature sensing signal line is connected to the end of the temperature sensor 2. The signal line of the temperature sensor 2 can be not only a line but also a terminal with a very small spacing. The principle is similar and will not be repeated. Before installation, the temperature sensor 2 is fixed to the back of the pressing block 4 with high-temperature glue, and the front of the pressing block 4 is in contact with the power tube 3. The pressing block 4 not only has good elasticity but also has good heat transfer effect, so that the temperature of the surface of the power tube 3 can be well conducted to the temperature sensor 2 through the pressing block 4. Secondly, the pressing block 4 and the temperature sensor 2 are installed together, giving the pressing block 4 a temperature sensing function while achieving a high degree of integration in structure. The power tube 3 is welded on the surface of the PCB board, and a heat sink is provided on the end face of the power tube 3 away from the PCB board.

[0026] Embodiment 1

[0027] See also Figure 1-3In one embodiment, in this embodiment, preferably, a power tube 3 is welded on the surface of the PCB board, and the plastic shell 1 includes an upper plastic shell arranged between the PCB board and the power tube 3. Both sides of the inner wall of the upper plastic shell cavity are provided with blocks for fixing the pressing block 4 inside the cavity. The position of the pressing block 4 can be fixed by setting the two blocks, which is convenient for subsequent disassembly and assembly.

[0028] See also Figure 1-3 In one embodiment, in this embodiment, preferably, a sleeve extending vertically upward is formed on the upper surface of the upper plastic shell, and the end of the sleeve passes through the PCB board, the sleeve includes a hollow cavity, a through hole symmetrically arranged on the sleeve and passing through the upper plastic shell, and the through hole is configured for the temperature sensing signal line to lead out, so that the temperature is conveniently transmitted to the front of the PCB board and sent to the CPU, and the through hole is specifically a small hole with a thermistor.

[0029] Embodiment 2

[0030] See also Figure 4-7 In one embodiment, in this embodiment, preferably, two power tubes 3 are welded on the surface of the PCB board, and the plastic shell 1 includes an upper plastic shell and a lower plastic shell. The upper plastic shell is arranged between the PCB board and the power tube 3, and a pressing block 4 is arranged inside the upper plastic shell to contact the surfaces of the two power tubes 3 respectively. A lower plastic shell is arranged between the two power tubes 3 to limit the pressing block 4 in the upper plastic shell. Temperature sensors 2 are installed on the surface of the pressing block 4 at the positions of the two power tubes 3. A screw hole is opened in the middle of the pressing block 4, and the end of the screw passes through the upper plastic shell, the pressing block 4 and the lower plastic shell. Through the arrangement of a pressing block 4, two power tubes 3 can be press-fitted at the same time. Secondly, the lower plastic shell can resist the middle part of the lower end surface of the metal spring 4, and play a certain supporting role. The signal of the temperature sensor 2 is introduced into the upper end of the PCB board, which is convenient for monitoring the temperature of the power tube 3 under the PCB board.

[0031] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0032] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A power tube compact with temperature sensing function, comprising a plastic shell (1), characterized in that: The inner wall of the plastic shell (1) is provided with a pressing block (4) in contact with the surface of the power tube (3); the pressing block (4) is configured to have good thermal conductivity, and a temperature sensor (2) is provided on the surface of the pressing block (4); the end of the temperature sensor (2) is connected to a temperature sensing signal line.

2. The power tube compact with temperature sensing function according to claim 1, characterized in that: The power tube (3) is welded on the surface of the PCB board, and a heat sink is provided on the end surface of the power tube (3) away from the PCB board.

3. The power tube compact with temperature sensing function according to claim 2, characterized in that: A power tube (3) is welded on the surface of the PCB board, and the plastic shell (1) comprises an upper plastic shell arranged between the PCB board and the power tube (3), and clamping blocks for fixing the pressing block (4) inside the cavity are provided on both sides of the inner wall of the upper plastic shell cavity.

4. The power tube compact with temperature sensing function according to claim 3, characterized in that: A sleeve extending vertically upward is formed on the upper surface of the upper plastic shell, and the end of the sleeve passes through the PCB board. The sleeve includes a hollow cavity, which is symmetrically arranged on the sleeve and passes through a through hole in the upper plastic shell, and the through hole is configured to allow the temperature sensing signal line to be led out.

5. The power tube compact with temperature sensing function according to claim 2, characterized in that: Two power tubes (3) are welded on the surface of the PCB board, the plastic shell (1) comprises an upper plastic shell and a lower plastic shell, the upper plastic shell is arranged between the PCB board and the power tube (3), and a pressing block (4) is arranged inside the upper plastic shell and contacts the surfaces of the two power tubes (3) respectively, a lower plastic shell is arranged between the two power tubes (3) and restricts the pressing block (4) within the upper plastic shell, and temperature sensors (2) are installed on the surface of the pressing block (4) at the positions of the two power tubes (3).

6. The power tube compact with temperature sensing function according to claim 5, characterized in that: A screw hole is provided in the middle of the pressing block (4), and the end of the screw passes through the upper plastic shell, the pressing block (4) and the lower plastic shell.

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