Fixing device for testing MOS (Metal Oxide Semiconductor) tube

Abstract

The utility model relates to the technical field of MOS tube testing equipment, in particular to a fixing device for testing an MOS tube, which mainly comprises a testing base and a fixing mechanism arranged on the testing base, the fixing mechanism comprises two groups of fixing units arranged around a mounting groove, and the fixing units are arranged on the testing base. And the two groups of fixing units are respectively used for limiting the freedom degrees of longitudinal movement and transverse movement of the MOS tube. When the device is used, the MOS tube is placed in the mounting groove and is in contact with a circuit board, the two groups of power devices are respectively used, the power devices drive the two contact plates to approach the MOS tube and clamp the MOS tube, and after the two groups of power devices operate in place, the MOS tube is fixed in the mounting groove. Through the above structure, a pressure fixing mode from top to bottom is not used any more, pressure is applied from four directions of the MOS tube, one contact point in the prior art is changed into four contact points, and the probability of stress concentration is reduced as much as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of MOS tube testing equipment, in particular to a fixing device for MOS tube testing. Background Art

[0002] MOS tube (Metal Oxide Semiconductor Field Effect Transistor) is a common semiconductor device, often used for amplification, switching and other circuit applications. The methods for testing MOS tubes include static parameter testing and dynamic parameter testing.

[0003] Static parameter testing includes measuring the drain current, gate voltage, drain-source voltage and other parameters of the MOS tube. These parameters can be obtained by connecting the MOS tube to the test circuit and then measuring it with a digital multimeter or oscilloscope. Dynamic parameter testing includes measuring the switching speed, frequency response and capacitance of the MOS tube. These parameters can be obtained by connecting the MOS tube to the test circuit and then measuring it with a signal generator and an oscilloscope.

[0004] In the test of MOS tubes, a test base of the MOS tube and related instruments for receiving MOS tube signals are often used, such as CN219609130U. The upper cover is provided with a pressure regulating component, and the pressure regulating component is used to provide pressure to the MOS tube, and apply pressure to the MOS tube from top to bottom to achieve the purpose of fixing. However, in this fixing method, the pressure regulating component applies pressure from top to bottom and does not completely cover the top of the MOS tube, which may cause stress concentration, affect the MOS tube, and cause inaccurate test results. Utility Model Content

[0005] The utility model aims to provide a fixing device for testing a MOS tube, so as to solve the problem in the prior art that stress concentration may be caused and the MOS tube may be affected.

[0006] The embodiments of the present invention are implemented by the following technical solutions:

[0007] A fixing device for testing a MOS tube comprises a test base and a fixing mechanism arranged on the test base, wherein a mounting groove is arranged in the middle of the test base, and a circuit board for contacting the MOS tube is arranged in the mounting groove;

[0008] The fixing mechanism includes two groups of fixing units arranged around the mounting groove, and the two groups of fixing units are respectively used to limit the longitudinal movement and lateral movement freedom of the MOS tube. The fixing unit is arranged inside the test base, and includes a power device and two contact plates. The power device is used to drive the two contact plates to move in a direction close to or away from the mounting groove.

[0009] In one embodiment of the utility model, the power device includes an internal threaded sleeve, a bolt and two sets of multi-link mechanisms, the internal threaded sleeve is fixed on the test base and is located above the mounting groove, the bolt is threadedly connected to the internal threaded sleeve, one end of the multi-link mechanism is rotatably connected to the bottom of the bolt, and the other end is connected to the contact plate.

[0010] In one embodiment of the utility model, the two groups of multi-link mechanisms include a first link and a second link, the first link is hinged to the second link, the other end of the first link is hinged to the bottom of the bolt, the other end of the second link is connected to the contact plate, and moves within the test base along the horizontal direction of the test base.

[0011] In an embodiment of the present invention, the test base is further provided with a movable groove, and the hinge point between the first connecting rod and the second connecting rod is located in the movable groove and moves.

[0012] In an embodiment of the present invention, telescopic parts are respectively provided at both ends of the contact plate.

[0013] In one embodiment of the utility model, a pressure sensor is arranged inside the contact plate, and also includes an early warning device, which is electrically connected to the pressure sensor and is used to receive a signal from the pressure sensor to remind the user whether the current pressure is too high.

[0014] In one embodiment of the present utility model, the early warning device includes a processor, a warning light and a control circuit for controlling the warning light to light up or go out, and the processor is electrically connected to the control circuit and the pressure sensor.

[0015] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0016] The above structure provided by the utility model mainly includes a test base and a fixing mechanism arranged on the test base, and the fixing mechanism includes two sets of fixing units arranged around the mounting groove, and the two sets of fixing units are respectively used to limit the longitudinal movement and lateral movement freedom of the MOS tube. Through the above structure, the pressure fixing method from top to bottom is no longer used, but pressure is applied from four directions of the MOS tube, from one contact point in the prior art to four contact points, which reduces the probability of stress concentration as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the top view structure of the utility model;

[0019] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0020] Figure 3 For this utility model Figure 2 Schematic diagram of the left view structure.

[0021] Icon: 1-test base, 2-circuit board, 3-mounting slot, 4-first connecting rod, 5-telescopic part, 6-contact plate, 7-bolt, 8-internal thread sleeve, 9-second connecting rod. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Please refer to Figure 1-Figure 3 A fixture for testing a MOS tube includes a test base 1 and a fixing mechanism arranged on the test base 1. The test base 1 is a conventional square block fixing base, which is mainly used to carry the MOS tube and related fixing devices and testing devices.

[0024] A mounting groove 3 is provided in the middle of the test base 1, which is concave toward the test base 1 and is used to place the MOS tube. A circuit board 2 is provided at the bottom of the mounting groove 3. The circuit board 2 is a conventional MOS tube test contact circuit board 2 for transmitting signals.

[0025] Specifically, the fixing mechanism includes two groups of fixing units arranged around the mounting groove 3, the two groups of fixing units are arranged vertically and crosswise, and the two groups of fixing units are respectively used to limit the longitudinal movement and lateral movement freedom of the MOS tube. The fixing unit is arranged inside the test base 1, including a power device and two contact plates 6, and the power device is used to drive the two contact plates 6 to move in a direction close to or away from the mounting groove 3.

[0026] The above structure provided by the utility model mainly includes a test base 1 and a fixing mechanism arranged on the test base 1, and the fixing mechanism includes two sets of fixing units arranged around the mounting groove 3, and the two sets of fixing units are respectively used to limit the longitudinal movement and lateral movement freedom of the MOS tube. When in use, the MOS tube is placed in the mounting groove 3, and after it is in contact with the circuit board 2, two sets of power devices are used respectively, and the power devices drive the two contact plates 6 to approach the MOS tube and clamp it. After the two sets of power devices are in place, the MOS tube is fixed in the mounting groove 3. Through the above structure, the pressure fixing method from top to bottom is no longer used, but pressure is applied from four directions of the MOS tube, from one contact point in the prior art to four contact points, which reduces the probability of stress concentration as much as possible.

[0027] An exemplary embodiment of the utility model, the power device includes an internal threaded sleeve 8, a bolt 7 and two sets of multi-link mechanisms, the internal threaded sleeve 8 is fixed on the test base 1 and is located above the mounting groove 3, the bolt 7 is threadedly connected to the internal threaded sleeve 8, one end of the multi-link mechanism is rotatably connected to the bottom of the bolt 7, and the other end is connected to the contact plate 6.

[0028] Specifically, the two sets of multi-link mechanisms include a first link 4 and a second link 9, the first link 4 is hinged to the second link 9, the other end of the first link 4 is hinged to the bottom of the bolt 7, the other end of the second link 9 is connected to the contact plate 6, and moves inside the test base 1 along the horizontal direction of the test base 1.

[0029] When in use, the bolt 7 is rotated, and the bolt 7 moves upward or downward in the internal threaded sleeve 8, thereby driving one end of the first connecting rod 4 to move up and down. Since the second connecting rod 9 is restricted in the test base 1, it will move in the horizontal direction under the drive of the first connecting rod 4, thereby pushing the contact plate 6 to move.

[0030] In addition, the test base 1 is also provided with a movable groove, and the hinge point between the first connecting rod 4 and the second connecting rod 9 is located in the movable groove and moves.

[0031] In an exemplary embodiment of the present invention, since different MOS tubes may have different lengths, in order to achieve the purpose of the contact plate 6 completely covering one side of the MOS tube as much as possible, telescopic parts 5 are respectively provided at both ends of the contact plate 6, and the telescopic parts 5 can be two plate-like structures of conventional shell telescoping.

[0032] In an exemplary embodiment of the present utility model, in order to enable the user to more intuitively see whether the clamping force used by the user is appropriate, a pressure sensor is provided inside the contact plate 6, and also includes an early warning device, which is electrically connected to the pressure sensor, and is used to receive a signal from the pressure sensor to remind the user whether the current pressure is too high. The early warning device includes a processor, a prompt light, and a control circuit for controlling the prompt light to light up or go out, and the processor is electrically connected to the control circuit and the pressure sensor.

[0033] A pressure threshold is set in the processor. When the rotating bolt 7 drives the second connecting rod 9 to move, the pressure sensor transmits the pressure signal to the processor. Once the pressure value reaches the pressure threshold, the processor connects the control circuit of the warning light to turn on the warning light, thereby achieving the purpose of early warning.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fixture for testing a MOS tube, characterized in that: It comprises a test base (1) and a fixing mechanism arranged on the test base (1); a mounting groove (3) is arranged in the middle of the test base (1); a circuit board (2) for contacting a MOS tube is arranged in the mounting groove (3); The fixing mechanism comprises two groups of fixing units arranged around the mounting groove (3), the two groups of fixing units being used to limit the longitudinal movement and lateral movement freedom of the MOS tube respectively, the fixing units being arranged inside the test base (1), comprising a power device and two contact plates (6), the power device being used to drive the two contact plates (6) to move in a direction approaching or away from the mounting groove (3).

2. A fixture for testing a MOS tube according to claim 1, characterized in that: The power device comprises an internal threaded sleeve (8), a bolt (7) and two sets of multi-link mechanisms, wherein the internal threaded sleeve (8) is fixed on the test base (1) and is located above the mounting groove (3), the bolt (7) is threadedly connected to the internal threaded sleeve (8), one end of the multi-link mechanism is rotatably connected to the bottom of the bolt (7), and the other end is connected to the contact plate (6).

3. A fixture for testing a MOS tube according to claim 2, characterized in that: The two sets of multi-link mechanisms include a first link (4) and a second link (9), wherein the first link (4) is hinged to the second link (9), the other end of the first link (4) is hinged to the bottom of the bolt (7), and the other end of the second link (9) is connected to the contact plate (6) and moves inside the test base (1) along the horizontal direction of the test base (1).

4. A fixture for testing a MOS tube according to claim 3, characterized in that: The test base (1) is also provided with a movable groove, and the hinge point between the first connecting rod (4) and the second connecting rod (9) is located in the movable groove and moves.

5. A fixture for testing a MOS tube according to claim 1, characterized in that: Telescopic parts (5) are respectively provided at both ends of the contact plate (6).

6. A fixture for testing a MOS tube according to claim 1, characterized in that: The contact plate (6) is provided with a pressure sensor inside and also includes an early warning device, the early warning device is electrically connected to the pressure sensor, and the early warning device is used to receive a signal from the pressure sensor to remind a user whether the current pressure is too high.

7. A fixture for testing a MOS tube according to claim 6, characterized in that: The early warning device comprises a processor, a warning light and a control circuit for controlling the warning light to light up or go out. The processor is electrically connected to the control circuit and the pressure sensor.

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