Insulated gate type field effect transistor detection circuit of open-loop push-pull converter

Abstract

The invention provides an insulated gate type field effect transistor detection circuit of an open-loop push-pull converter. The detection circuit comprises a voltage division changed voltage detection signal group, the voltage division changed voltage detection signal group comprises a diode connected to the drain of an MOS tube of a winding A of the push-pull converter, a divider resistor of thediode, another diode connected to the gate of an MOS tube of a winding B of the push-pull converter, and a divider resistor of the other diode; and the voltage improved signal is connected with the negative end of a comparator, the positive end of the comparator is connected with a reference voltage signal, and the output end of the comparator is connected with a master control unit. The detection circuit has the advantages that PCB occupation is smaller compared with two current transformers, the reliability is high, the detection speed is high, the resistant voltage division circuit can beused to further reduce the cost, and the detection circuit is suitable for the high-reliability pre-stage push-pull converter of a large power inverter.

Description

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AI Technical Summary

Benefits of technology

This patented technology improves on existing designs by reducing size while maintaining their performance at higher levels compared to traditional methods like multiple coils or resistive voltage division circuits (RV).

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the efficiency and effectiveness of power converters (power supply systems) that use switches like transistors instead of resistive elements. Specifically, there has been no effective way to accurately diagnose if any issues exist during operation due to excessively large currents caused by faults such as those involving external wires connected to certain components within these circuits.

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