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

A technology of power switch tube and full-bridge converter, which is applied in the direction of converting AC power input to DC power output, converting DC power input to DC power output, control/regulation system, etc.

Active Publication Date: 2021-06-08
NANTONG UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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

Method used

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

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Embodiment Construction

[0030] The present invention provides a method for monitoring the health of a power switch tube of a full-bridge converter. In order to make the object, technical solution and effect of the present invention clearer and clearer, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific implementations described here are only used to explain the present invention, not to limit the present invention.

[0031] Such as figure 1 As shown, the present invention discloses a method for health monitoring of a power switch tube of a full-bridge converter, comprising the following steps:

[0032] Step A), synchronously sampling the voltage signal V across the inductor L L and switch tube Q 1 ~Q 4 The switch signal s 1 ~s 4 ;

[0033] Step B), according to the switch signal s 1 ~s 4 Separation step A) the voltage signal V obtained by sampling L Corresponding to the switching tube Q 1 ~...

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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...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M3/158G01R31/26
CPCG01R31/2621H02M3/158H02M7/5387
Inventor 任磊段冰莹田民吴锐张雷秦岭
Owner NANTONG UNIVERSITY
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