A dynamic on-resistance test circuit and method for a bidirectional power device

By constructing a multi-mode test circuit and utilizing a bidirectional stress module and high-precision detection technology, the problem of dynamic on-resistance testing of bidirectional devices under AC operating conditions was solved, achieving high-precision online measurement and signal extraction, and expanding the applicability of the test platform.

CN122193848APending Publication Date: 2026-06-12UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Filing Date
2026-03-24
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing dynamic on-resistance testing circuits cannot accurately simulate the electrical stress of bidirectional devices under AC operating conditions, and are difficult to accurately distinguish weak on-resistance signals under high voltage, resulting in distorted measurement results.

Method used

A multi-mode test circuit is constructed by employing a configurable bidirectional stress module, a filter energy storage module, and a bidirectional high-precision detection module, combined with dual active isolation and Schottky clamping technology, to achieve high-precision online measurement.

Benefits of technology

It enables high-precision dynamic on-resistance testing under real stress conditions, which can reproduce the voltage stress and current freewheeling process of devices in AC applications, expands the applicability of the test platform, effectively extracts weak signals, and improves the accuracy of measurement.

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Abstract

The application discloses a kind of dynamic on-resistance test circuit and method of bidirectional power device, belong to power device test technical field.The circuit includes power supply, configurable bidirectional stress, filter energy storage, bidirectional high-precision detection, load and control module.Configurable bidirectional stress module uses general bridge architecture, supports alternating current freewheeling and series load test by flexible configuration.In alternating current freewheeling test, it cooperates filter energy storage module to simulate alternating current field stress and provides freewheeling;In series load test, alternating polarity direct current voltage is applied to the cross-connection device to be measured by full-bridge switching.In bidirectional high-precision detection module, double active isolation switch and bidirectional schottky diode clamping network are used to realize physical isolation in high-voltage blocking period and accurate collection of weak voltage drop in on period.The application realizes high-precision online measurement under the condition of simulating actual working condition or alternating polarity steady-state on condition, and provides a reliable means for device performance evaluation.
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