Direct-current chopping power module

Abstract

The invention relates to a direct-current chopping power module which comprises a shell and a main circuit board. The main circuit board comprises a substrate, semiconductor chips, devices, at least two electrode terminals and control terminals, the semiconductor chips and the devices are connected onto the substrate, the main circuit board is fixed with the shell through sealant, at least two electrode terminals are arranged on two sides of the substrate respectively, each electrode terminal comprises a support and an electrode leading plate, the supports are arranged inside the shell and vertically 'M'-shaped, a base plane of each support is fixedly connected with the substrate, the electrode leading plates penetrate out of a shell top plate and are arranged on the top surface of the shell, each control terminal comprises at least one fixed seat and more than two leading pins, at least two positioning columns and more than two driving circuit board seats are arranged on an outer portion of the shell top plate, and at least one limiting clamping pin is arranged on two sides on the outer portion of the shell top plate respectively. The direct-current chopping power module is modified in the electrode terminals, the control terminals and the shell, more rational in structure, good in shock resistance and capable of improving working reliability.

Description

technical field [0001] The invention relates to a DC chopper power module and belongs to the technical field of power module manufacturing. Background technique [0002] DC chopper power modules are used in computer hardware circuits, controllers of various switching power supplies, and electric vehicle controllers. output. Existing DC chopper power modules mainly include semiconductor chips, capacitors, diodes and other devices, electrode terminals, control terminals and substrates. They are all welded on the base plate to form a main circuit board, and the circuit connection is realized through various circuit components to form a DC chopper circuit, and the main circuit board is sealed and fixed on the shell by potting glue. However, when the DC chopper power module with the above structure is used to supply power to the DC motors of electric vehicles and electric motorcycles, due to the impact force generated by the vibration of the vehicle and electric motorcycles on ...

AI Technical Summary

Problems solved by technology

However, when the DC chopper power module with the above structure is used to supply power to the DC motors of electric vehicles and electric motorcycles, due to the impact force generated by the vibration of the vehicle and electric motorcycles on the DC chopper power module, although the components, Semiconductor chips, electrode terminals, and control terminals are soldered and then fixed with sealant, but it will still cause impact, especially the electric-level terminals need to be connected to other equipment, and the vibration will have a greater impact on the electrode terminals

At present, the electrode terminals all adopt the vertical groove base structure, and the bottom of the vertical groove is bent inward and welded to the substrate. Although the vertical groove structure can be used to release the stress caused by the welding of the bottom of the electrode lead-out plate when it is bent, the electrode terminal The vertical tank base structure cannot effectively absorb the impact caused by vehicle vibration, and the working environment of the DC chopper power module is cycled between -40°C and 125°C, so after a period of time, it will accelerate the electrode terminal welding. , thereby affecting the lifetime of the overall power device

Furthermore, the lead pins on the control terminals are respectively welded on the substrate. Since the lead pins are only limited by the shell, the vibration when the wheel is running will affect the reliability of the connection, so there is a single lead pin that falls off. problems, so that the reliability of the DC chopper power module is not high

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