Clamp capable of quickly adjusting average current of three levels connected in parallel

Abstract

The utility model relates to a clamp capable of quickly adjusting the average current of three levels connected in parallel, which comprises a clamp body used for adjusting an external inductance wire, the clamp body is composed of a base and a vertical pillar arranged above the base, the vertical pillar is provided with at least one hoop matched with the diameter of the vertical pillar, and the hoop is provided with a clamping groove. One end of each hoop is fixedly provided with a horizontal vernier positioning ruler perpendicular to the vertical supporting column, the outer side of the other end of each hoop is sleeved with an adjusting mechanism, the adjusting mechanisms are used for achieving fixing and moving of the hoops, and the hoops in the moving state are used for adjusting the height and the horizontal angle of the horizontal vernier positioning rulers. The horizontal vernier positioning ruler is sleeved with a sliding block, the sliding block can slide left and right on the horizontal vernier positioning ruler, and a groove is formed in the top face of the sliding block and used for fixing an inductance wire. The utility model discloses.

Description

Technical Field

[0001] The utility model belongs to the technical field of IGBT module debugging and testing, and relates to a fixture capable of quickly adjusting the average current of three parallel-connected electrodes. Background Art

[0002] Currently, three-level topologies are increasingly being adopted in industries such as energy storage, photovoltaics, and SVG. System current sharing is designed based on the product characteristics of each manufacturer. However, during the laboratory verification and R&D stage, adjusting the current sharing for different parallel platforms is quite laborious. The adjustment process cannot be quantified, making it difficult to review previous tests, which brings problems to the verification of various problems encountered during testing.

[0003] If there is a strong magnetic field near the IGBT module, the module current sharing will be affected. If two modules are connected in parallel and installed side by side, if the inductor of the AC output bus is close to one module and far away from the other, the current sharing performance will be affected. The above reason is that when a large current flows through the inductor, it generates a magnetic field, which has an extrusion or attraction effect on other conducting currents in the magnetic field. Therefore, during testing, it is necessary to pay attention to the placement of the inductor to avoid magnetic field interference.

[0004] Therefore, the key to adjusting the parallel current sharing lies in the external inductor of the platform. Adjusting the relative height of the inductor and the test platform, the horizontal position and the bending shape of the inductor will affect the current sharing effect. Figure 1 This is the current waveform during the primary current sharing debugging of a four-parallel three-level platform. As can be seen from the figure, the current of channel 2 is only 170A, while the current of the remaining channels is around 400A, indicating poor current sharing.

[0005] Therefore, a fixture is designed to quickly adjust the average current of three parallel electrodes. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a fixture that can quickly adjust the average current of three parallel devices with simple and reasonable structure, stable operation, practicality and convenience, and greatly improve the efficiency of current equalization regulation.

[0007] The utility model is realized through the following technical solutions: a clamp capable of quickly adjusting the average current of three parallel electrodes, comprising a clamp body for adjusting an external inductor line, the clamp body consisting of a base and a vertical pillar arranged above the base, the vertical pillar being provided with at least one clamp matching the diameter of the vertical pillar, a horizontal vernier locating ruler perpendicular to the vertical pillar being fixed at one end of each clamp, an adjustment mechanism being sleeved on the outer side of the other end, the adjustment mechanism being used to achieve the fixation and movement of the clamp, thereby adjusting the height and horizontal angle of the horizontal vernier locating ruler, a slider being sleeved on the horizontal vernier locating ruler, the slider being able to slide left and right on the horizontal vernier locating ruler, and a groove being provided on the top surface of the slider for fixing the inductor line.

[0008] Preferably, the horizontal vernier positioning ruler is provided with a scale for facilitating left and right position adjustment of the slider.

[0009] Preferably, a height mark is provided on the vertical support, and after adjusting the tightness of the clamp by the adjustment mechanism, the height of the horizontal vernier positioning ruler can be adjusted conveniently in conjunction with the height mark.

[0010] Preferably, an opening is provided at one end of the clamp, in which a horizontal vernier positioning ruler is fixed by bolts and nuts, and a through hole with a thread is provided on the opposite side of the opening, in which an adjustment mechanism is provided, and the tightness of the clamp is adjusted by the adjustment mechanism.

[0011] Preferably, the adjustment mechanism is an adjusting knob, and a protruding positioning column with a thread is provided at one end of the adjusting knob, and the positioning column is inserted into the through hole. When the positioning column is pressed against the side of the vertical pillar under the action of the adjusting knob, the clamp is fixed. When the positioning column is away from the side of the vertical pillar under the action of the adjusting knob, the clamp can move up and down on the vertical pillar and rotate 360 ​​degrees horizontally, so as to facilitate the adjustment of the height and direction of the horizontal vernier positioning ruler.

[0012] Preferably, the base is a cylindrical fixed base or a clamping fixed base.

[0013] The beneficial effects of the utility model are as follows:

[0014] During repeated tests, the experimenters found that by comparing the adjustment of the inductor line position to the three-coordinate system XYZ, with two X axes extending from the Z axis, and only adjusting the positions of the two X axes after fixing the YZ coordinate axis positions, the platform current sharing can be quickly adjusted, which greatly saves the debugging process. For this purpose, the fixture of the utility model is designed to greatly improve the efficiency of current sharing adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is the current waveform of the primary current sharing debugging of a four-parallel three-level platform.

[0016] Figure 2 It is a structural diagram of the present utility model.

[0017] Figure 3 This is a diagram of the usage state of the utility model.

[0018] Figure 4 It is a structural schematic diagram of the holding hoop in the utility model.

[0019] Figure 5 This is the current sharing test waveform of debugging 1 of the present invention.

[0020] Figure 6 This is the debugging 2 current sharing test waveform of the present invention.

[0021] Figure 7 This is the current sharing test waveform after debugging of the utility model is completed. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to more clearly understand the purpose, technical solutions and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0023] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inside", "outside", "horizontal", and "vertical" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0024] The present invention will be described in detail below with reference to the accompanying drawings: Figure 2-3 As shown, a fixture capable of quickly adjusting the average current of three parallel electrodes includes a fixture body for adjusting an external inductor line, the fixture body consisting of a base 1 and a vertical support 2 (serving as the Z-axis) arranged above the base 1, at least one clamp 3 matching the diameter of the vertical support 2 is mounted on the vertical support 2, a horizontal vernier locator 4 (serving as the X-axis) perpendicular to the vertical support 2 is fixed at one end of each clamp 3, and an adjustment mechanism is sleeved on the outer side of the other end thereof, which is used to achieve the fixation and movement of the clamp 3, thereby adjusting the height and horizontal angle of the horizontal vernier locator 4, a slider 5 is sleeved on the horizontal vernier locator 4, the slider 5 can slide left and right on the horizontal vernier locator 4, and a groove 6 is provided on the top surface of the slider 5 for fixing the inductor line 7.

[0025] The horizontal vernier positioning ruler 4 is provided with a scale 8 for facilitating left and right position adjustment of the slider 5 .

[0026] The vertical support 3 is provided with a height mark 9. After adjusting the tightness of the clamp 3 by the adjustment mechanism, the height of the horizontal vernier positioning ruler 4 can be adjusted in conjunction with the height mark 9.

[0027] like Figure 4 As shown, an opening 10 is provided at one end of the clamp 3, and a horizontal vernier positioning ruler 4 is fixed in the opening 10 by a bolt 12 and a nut 11. A through hole 13 with a thread is provided on the opposite side of the opening 10, and an adjustment mechanism is provided in the through hole 13 to adjust the tightness of the clamp 3 by the adjustment mechanism.

[0028] The adjustment mechanism is an adjustment knob 14, and a protruding positioning column 15 with a thread is provided at one end of the adjustment knob 14. The positioning column 15 is inserted into the through hole 13. When the positioning column 15 is pressed against the vertical pillar 2 sideways under the action of the adjustment knob, the clamp 3 is fixed. When the positioning column 15 is moved away from the vertical pillar sideways under the action of the adjustment knob, the clamp 3 can move up and down on the vertical pillar 2 and rotate 360 ​​degrees horizontally, which is convenient for adjusting the height and direction of the horizontal vernier positioning ruler 4.

[0029] The base 1 is a cylindrical fixed base or a clamping fixed base.

[0030] This fast-adjustable current-sharing fixture consists of several components: a base, a vertical support (Z-axis), and a horizontal vernier scale (X-axis). The fixture base can be configured as a fixed, adjustable base, or a clampable desktop fixture, depending on actual testing requirements, ensuring proper operation of the entire fixture. The slider of the horizontal vernier scale has a groove (cage) for securing the inductor, allowing for relative definition of the inductor's position along the X-axis. The horizontal vernier scale can be moved up and down on the vertical support and rotated 360°. The vertical support also has a scale for relative definition of the inductor's position along the Z-axis.

[0031] The use of the fixture in this utility model can greatly improve the efficiency of current equalization regulation. After 3 to 4 adjustments, the current equalization can reach the ideal state. After the fixture of this utility model is installed as a whole, it is tested. Figure 5 To debug waveform 1, check on the waveform which module has the smallest output current, and then move the horizontal cursor to the module by an appropriate distance. After moving, test the waveform, refer to Figure 6 Debug 2 waveform to check the effect of current sharing. The waveform adjustment does not achieve the ideal effect. It is necessary to adjust the inductor line closer to the module with small current. Repeat 1~2 times to achieve the ideal current sharing effect. Figure 7 The current sharing waveform is shown.

[0032] The specific embodiments described herein are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, any equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this utility model shall be covered by the claims of this utility model.

Claims

1. A fixture for quickly adjusting the average current of three parallel electrodes, comprising a fixture body for adjusting an external inductor line, characterized in that: The clamp body is composed of a base (1) and a vertical support (2) arranged above the base (1); at least one clamp (3) matching the diameter of the vertical support (2) is installed on the vertical support (2); a horizontal vernier positioning ruler (4) perpendicular to the vertical support (2) is fixed at one end of each clamp (3); an adjustment mechanism is sleeved on the outer side of the other end thereof, and the adjustment mechanism is used to achieve the fixation and movement of the clamp (3), thereby adjusting the height and horizontal angle of the horizontal vernier positioning ruler (4); a slider (5) is sleeved on the horizontal vernier positioning ruler (4), and the slider (5) can slide left and right on the horizontal vernier positioning ruler (4), and a groove (6) is provided on the top surface of the slider (5) for fixing the inductor line (7).

2. The fixture capable of quickly adjusting the average current of three parallel electrodes according to claim 1, characterized in that: The horizontal vernier positioning ruler (4) is provided with a scale (8) for facilitating left and right position adjustment of the slider (5).

3. The fixture capable of quickly adjusting the average current of three parallel electrodes according to claim 1 or 2, characterized in that: The vertical support (3) is provided with a height mark (9), and after adjusting the tightness of the clamp (3) by the adjustment mechanism, the height of the horizontal vernier positioning ruler (4) can be adjusted in conjunction with the height mark (9).

4. The fixture capable of quickly adjusting the average current of three parallel electrodes according to claim 3, characterized in that: An opening (10) is provided at one end of the clamp (3), and a horizontal vernier positioning ruler (4) is fixed in the opening (10) by means of a bolt (12) and a nut (11). A through hole (13) with a thread is provided on the opposite side of the opening (10), and an adjustment mechanism is provided in the through hole (13), and the tightness of the clamp (3) is adjusted by the adjustment mechanism.

5. The fixture capable of quickly adjusting the average current of three parallel electrodes according to claim 4, characterized in that: The adjusting mechanism is an adjusting knob (14), and a protruding positioning column (15) with a thread is provided at one end of the adjusting knob (14). The positioning column (15) is inserted into the through hole (13). When the positioning column (15) is pressed against the vertical pillar (2) sideways under the action of the adjusting knob, the hoop (3) is fixed. When the positioning column (15) is moved away from the vertical pillar sideways under the action of the adjusting knob, the hoop (3) can move up and down on the vertical pillar (2) and rotate 360 ​​degrees horizontally, so as to facilitate the height and direction adjustment of the horizontal vernier positioning ruler (4).

6. The fixture capable of quickly adjusting the average current of three parallel electrodes according to claim 1, characterized in that: The base (1) is a cylindrical fixed base or a clamping fixed base.

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