Health monitoring method and system for power switch tube of full-bridge converter

Abstract

The invention belongs to the technical field of monitoring in an electric energy conversion device, and discloses a health monitoring method and system for a power switch tube of a full-bridge converter, and the method comprises the steps: 1, synchronously sampling voltages VL at two ends of an inductor L and switching signals s1-s4 of switch tubes Q1-Q4; 2, separating ringing signals respectively corresponding to the switching tubes Q1 to Q4 in the sampling signal VL according to the s1 to s4; 3, respectively calculating corresponding ringing frequencies according to the separated ringing signals of the corresponding switch tubes Q1 to Q4; and 4, according to the ringing frequencies corresponding to the switching tubes Q1 to Q4, health assessment is carried out on the switching tubes Q1 to Q4. The method provided by the invention does not affect the normal work of the converter, can accurately monitor the ringing frequency of the power switch tube in the full-bridge converter, and provides a basis for life prediction of the switch tube.

Description

technical field [0001] The invention belongs to the technical field of monitoring in electric energy conversion devices, in particular to a method and system for health monitoring of a power switch tube of a full-bridge converter. Background technique [0002] System fault prediction and health management (Prognostics and Health Management, PHM) is a comprehensive fault detection, isolation and prediction and health management technology. By monitoring the fault characteristic parameters of the system and using various reasoning algorithms to estimate the health status of the system itself, it can monitor and effectively predict the faults of the system as early as possible before the occurrence of system faults, accurately locate the degradation or fault parts, and combine various information resources Given the maintenance plan, so as to realize the condition-based maintenance and autonomous support of the system, it is of great significance to reduce maintenance costs, en...

AI Technical Summary

Problems solved by technology

Because the power switch tube is in a high-power and strongly nonlinear working state, there are few reports on the method of monitoring its junction capacitance

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