An igbt series crimping package unit and a DC circuit breaker using the package unit

Abstract

The invention provides an IGBT series crimping packaging unit and a DC circuit breaker with same. The IGBT series crimping packaging unit comprises a supporting frame and an IGBT valve string. The end of the IGBT valve string on the supporting frame is provided with a crimping stress cone. The supporting frame comprises a first flange plate which is next to the end of the crimping stress cone. The first flange plate is in threaded connection with a pressure adapter which forms a lead screw nut mechanism with the first flange plate. The pressure adapter is provided with a through hole for passing of a pushing rod of the crimping stress cone. The pressure adapter has a crimping end which matches the crimping stress cone. The IGBT series crimping packaging unit and the DC circuit breaker are advantageous in that the pressure adapter is in threaded fit with the first flange plate, thereby realizing precise inward movement of the IGBT series crimping packaging unit on the first flange plate through rotation of the pressure adapter until a clearance is precisely filled, thereby ensuring total consistency between an applied pressure and a kept pressure, realizing precise control on a crimping force, ensuring high crimping effect and improving crimping quality.

Description

technical field [0001] The invention relates to an IGBT series crimping packaging unit and a DC circuit breaker using the packaging unit. Background technique [0002] Insulated gate bipolar transistor (IGBT) is a nearly ideal semiconductor high-power switching device. It has the characteristics of large input impedance, low driving power, low switching loss, high voltage and high current, etc. It integrates the gate voltage characteristics of MOSFET and the low The characteristics of on-resistance are integrated into one body, and it is widely used, especially in many fields such as wind power converters, photovoltaic inverters, and motor frequency converters. [0003] At present, IGBT series crimping packaging units have been widely used in the field of flexible DC power transmission technology. There are also various crimping packaging methods for crimping IGBTs. The more mature crimping packaging methods mainly include vertical and horizontal. , the different crimping p...

AI Technical Summary

Problems solved by technology

[0005] This IGBT press-fit unit structure leads to a problem during press-fit, because the adjustment gasket that matches the size of the gap is selected to fill it, and the IGBT press-fit unit has very strict requirements for the press-fit force, and the pressure is too high It will damage the IGBT. If the pressure is too low, it will cause inconsistent pressure equalization and affect the performance of the press-fit unit. If the adjustment gasket is slightly larger, it will increase the press-fit force if the gasket is inserted. On the contrary, it will reduce the press-fitting force, and it is very difficult to find an adjusting gasket with the right size, so the press-fitting force that needs to be maintained cannot be precisely controlled, resulting in low press-fit quality and unsatisfactory press-fit effect

In addition, since one end of the valve string is provided with a disc spring, when the disc spring is deformed and compressed during use, the adjusting gasket plugged to the other end may become loose and fall out of the valve string, resulting in the failure of the entire IGBT. The series crimp package unit cannot be used normally

[0006] In addition, in order to achieve high potential isolation between the support frame and the IGBT in the IGBT press-fit unit, an insulating isolation plate is set outside the press-fit stress cone, which increases the components of the press-fit unit, resulting in a complex structure

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