Non-contact antenna sensor for monitoring power electronic switching device

By sensing the electromagnetic field changes of power electronic switching devices through a loop antenna and capturing the current change rate di/dt information, the problems of low integration, high cost and insufficient safety of existing non-contact sensors are solved, and efficient and safe status monitoring of power electronic switching devices is realized.

CN121763041APending Publication Date: 2026-03-31TONGJI UNIV
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Patent Information

Application Number
CN202610260495.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-04
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Existing non-contact sensors suffer from low integration, poor installation flexibility, high cost, and insufficient security when monitoring power electronic switching devices, making it difficult to meet the development needs of high frequency and high power density.

Method used

A non-contact antenna sensor is used to sense the electromagnetic field changes of power electronic switching devices during switching transients through a loop antenna. The current change rate di/dt information is captured by an oscillation circuit and a detection circuit to achieve state assessment without needing to be inserted into the commutation circuit or in contact with the system under test.

Benefits of technology

It enables low-cost, highly integrated, and convenient status monitoring of power electronic switching devices without compromising system safety, avoiding voltage overshoot caused by parasitic inductance in the commutation circuit, and improving the safety and reliability of monitoring.

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Abstract

The invention discloses a non-contact antenna sensor for monitoring a power electronic switching device. The non-contact antenna sensor comprises an annular antenna, an oscillating circuit and a detection circuit, the change of the current i of the tested power electronic switching device in the switching transient process causes the change of the surrounding magnetic field B, thereby causing the change of the planar magnetic flux phi of the loop antenna, and enabling the two ends of the loop antenna to generate induced electromotive force e. The oscillating circuit outputs oscillating voltage Vosc under the action of the induced electromotive force e; the detection circuit extracts the initial peak value Vp of the oscillation voltage Vosc and maintains the output voltage Vo of the oscillation voltage Vosc at the initial peak value Vp state for a preset time; under the conditions that a commutation loop is not inserted and no contact is generated with a tested system, information of the current change rate of the power electronic switching device at the switching moment is captured, so that state evaluation is carried out on the power electronic switching device, and the device has the advantages of low cost, light size, high integration level, convenience in use and the like.
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