Brick type DC/DC power module built-in electromagnetic screen and installing method thereof

Abstract

The invention discloses a brick type DC / DC power module built-in electromagnetic screen. The screen is composed of an aluminum base heat dissipation board, a bonding sheet, a flexible circuit board and a power board. The invention further discloses an installing method of the brick type DC / DC power module built-in electromagnetic screen. The bonding sheet is used for bonding the flexible circuit board on the aluminum base heat dissipation board in a press fit mode. Meanwhile, a copper-covering region on the flexible circuit board and a corresponding electrical part on the power board are welded together in the mode that reflow soldering is performed through low-temperature soldering paste, so that an effect of equal potential electromagnetic shielding is achieved. Electromagnetic disturbance on the external world by an internal conversion circuit of a DC / DC power module can be effectively reduced, meanwhile, the high-intensity electrical insulation requirement ( larger than or equal to 3KVAC / 1min) between the electrical part inside the power module and the aluminum base heat dissipation board can be met, and the brick type DC / DC power module built-in electromagnetic screen has the advantages of being simple in structure, small in thickness, good in heat conduction performance, high in insulation intensity, easy to operate and the like.

Description

technical field [0001] The invention belongs to an electromagnetic shielding device, in particular to an electromagnetic shielding device that can be built in a DC / DC power supply module, and can be used to improve the electromagnetic compatibility performance of a brick-type DC / DC power supply module. The invention also relates to a method of mounting the aforementioned device. Background technique [0002] At present, modular DC / DC power supply modules have been widely used in military and industrial fields due to their significant advantages such as high power density, small size, reliable performance, convenient use, and effective shortening of related product development and verification cycles. Its working principle is to convert DC voltage into AC voltage through PWM chopping, transmit through transformer isolation, and then obtain the required DC voltage through rectification and filtering. The internal MOSFETs that function as switches and rectifiers work in high-...

AI Technical Summary

Problems solved by technology

Measure 1) Since the soft switching circuit has the weakness of patent protection and relatively low efficiency value in the field of DC / DC power supply modules, it is no longer the preferred solution; Measure 2) adopts the shielding measures of all metal shells, which will bring about a significant increase in cost. The insulation is not easy to handle during use, which leads to problems such as inconvenient use, and it is used on a small number of products; measure 3) will bring about problems such as increased application costs, increased equipment volume, and inconvenient use.

Images