Method and device for measuring parasitic inductance of direct-current support capacitor and readable storage medium

Abstract

The invention provides a direct-current support capacitor parasitic inductance measuring method and device and a readable storage medium, and relates to the field of direct-current support capacitors, and the method comprises the steps: calculating first parasitic inductance of an output port of an insulated gate bipolar transistor in a loop through a finite element algorithm; calculating second parasitic inductance of the copper bar through a finite element algorithm; and calculating third parasitic inductance of the direct current support capacitor according to the first parasitic inductance and the second parasitic inductance. According to the method for measuring the parasitic inductance of the direct-current support capacitor, the parasitic inductance of the direct-current support capacitor is measured before product production through short circuit of the direct-current support capacitor by the copper bar, so that the copper bar design of a film capacitor can be effectively guided, the loop inductance of an insulated gate bipolar transistor (IGBT) can be controlled, and the design target can be accurately achieved; the copper bar design is improved according to the design target, and parasitic inductance optimization is carried out.

Description

technical field [0001] The invention relates to the field of DC support capacitors, in particular to a method, device and readable storage medium for measuring the parasitic inductance of DC support capacitors. Background technique [0002] Such as figure 1 As shown, current motor controllers mostly use DC support capacitors, also known as DC-link capacitors, which function before the inverter to provide a stable voltage source, the required pulse input current, and filter electromagnetic interference EMI. Due to the stray inductance of the IGBT main circuit busbar, when the IGBT is turned off, the collector-emitter current will drop rapidly. The characteristic of the inductance is that the current cannot be transient and will An induced electromotive force is generated to form a peak voltage. The direction of these peak voltages is consistent with the direction of the DC bus voltage and the voltage direction of the DC-link capacitor. Superimposing on the bus will cause th...

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Problems solved by technology

[0004] The embodiment of the present invention provides a method, device and readable storage medium for measuring the parasitic inductance of the DC support capacitor, which are used to solve the problem that most of the methods for extracting the parasitic inductance of the DC support capacitor in the prior art are to perform double-pulse test calculation after the sample comes out, It can only be used as a means of design verification and has no role in guiding design

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