Composite shielding device for driving circuit

Abstract

The invention relates to a shielding and isolating technology between an IGBT (Insulated Gate Bipolar Translator) and a driving unit, in particular to a composite shielding device for the driving circuit. According to the composite shielding device, the technical problems that electromagnetic interference between the IGBT and the driving unit cannot be completely shielded and high-voltage interference cannot be isolated at present are solved. The composite shielding device for the driving circuit comprises a layer of metal shielding plate, two layers of insulating plates and an insulating protective film for performing pressing seal on the three layers of plates to form a whole; the metal shielding plate is produced by processing a 6061 aluminum-alloy sheet with the thickness of 1 to 1.5mm; insulating layers with the thickness of 1 to 1.5mm, which are made by processing insulating materials GPO-3, are tightly adhered to two sides of the metal shielding plate; a metal shielding layer and two insulating layers are enabled to form a whole by using the high-voltage-resisting insulating protective film in a pressing seal manner; a driving plate mounting hole is formed in the composite shielding plate; metal parts on the upper side, the lower side, the left side and the right side of the metal layer outwards extend in sections; mounting holes are formed in the corresponding extending parts. According to the composite shielding device disclosed by the invention, the interference of an alternating magnetic field on a low-voltage signal of the driving plate can be reduced, the working reliability of the IGBT is improved, and electrical voltage-resisting insulating conditions of 10,000V can be met.

Description

technical field [0001] The invention relates to a shielding insulation isolation technology between an IGBT and a driving unit, in particular to a composite shielding device for a driving circuit. Background technique [0002] With the continuous improvement of current and voltage levels, IGBT has become a rational working device in the converter device in the AC drive locomotive environment, and the opening and closing of high-voltage and high-current IGBT is the key to complete the function conversion of the power unit. The drive unit is used to control the IGBT switch and protect the IGBT, so the drive circuit has an important influence on the entire converter. The traction control unit Traction Control Unit (hereinafter referred to as TCU) sends a control signal to the drive circuit (drive board), and the drive circuit sends a signal to control the IGBT switch. The IGBT working status is transmitted to the TCU through the feedback signal of the drive board, and the fault...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the technical problem that the electromagnetic interference between the IGBT and the driving unit cannot be completely shielded and the high-voltage interference cannot be isolated, the present invention provides a driving circuit composite shielding device

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