Method, device, medium and equipment for online detection of power semiconductor switching loss

Abstract

This application belongs to the field of power electronics technology, specifically disclosing a method, apparatus, medium, and device for online detection of switching losses in power semiconductors. The method includes: constructing a detection link and injecting a dual-frequency carrier signal to acquire the high-frequency response voltage across a parasitic inductor in real time; decoupling the acquired high-frequency response voltage; locating the voltage and current change rates within the switching operation range of the power semiconductor based on the decoupled high-frequency response signal, and calibrating the parasitic inductor online under the current operating condition; calculating the switching losses of the power semiconductor based on the located voltage and current change rates within the switching operation range and the calibrated parasitic inductor; repeating the above steps, continuously iterating and updating the loss data to detect the health status of the power semiconductor. This application enables high-precision online detection of switching losses in power semiconductors.

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