Monitoring method of IGBT collector overvoltage double protection

Abstract

The invention relates to a monitoring method of IGBT collector overvoltage double protection. An IGBT collector overvoltage double protection circuit, which comprises an IGBT, a microcontroller, an IGBT driving circuit, a resistor R1 and a resistor R2. An output end of the IGBT driving circuit is connected to a grid G of the IGBT. The collector C of the IGBT is connected to an input end of the microcontroller after voltage divider of the tandem voltage divider resistors R1 and R2. The output end of the microcontroller is connected to the input end of the IGBT driving circuit. The microcontroller comprises comparators CMP1 and CMP2, a first IGBT control circuit and a second IGBT control circuit, negative input ends of the comparators CMP1 and CMP2 are respectively connected with reference voltages, and output ends are respectively connected with the first IGBT control circuit and the second IGBT control circuit, wherein when the comparator CMP1 outputs a high electrical level, the microcontroller generates an interrupt handling program INT1 by the handling of the first IGBT control circuit; and when the comparator CMP2 outputs a high electrical level, the IGBT is turned off by the handling of the second IGBT control circuit, and the microcontroller generates an interrupt handling program INT2. By adopting the method, the IGBT collector voltage can be monitored in real time.

Description

technical field [0001] The invention is a monitoring method for dual protection of IGBT collector overvoltage, in particular a method for protecting IGBT and preventing IGBT overvoltage damage when the IGBT collector voltage of an electromagnetic cooker power control device exceeds its rated operating voltage. The invention relates to an innovative technology of an IGBT protection and monitoring method for an induction cooker power control device. Background technique [0002] At present, the insulated gate bipolar transistor (IGBT) of the power control device of the induction cooker is equipped with an overvoltage protection circuit. When the protection circuit detects the overvoltage of the IGBT collector C, the IGBT turn-on time is automatically reduced, but the IGBT turn-on time cannot be reduced too much. , otherwise the power of the induction cooker fluctuates too much, so in order to stabilize the power of the induction cooker, the reduced value of the IGBT turn-on ti...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to consider the above problems and provide a real-time monitoring of the IGBT collector voltage, which can effectively solve the technical problems in the prior art that the IGBT overvoltage protection is not timely and cause IGBT damage, and improve the safety of the induction cooker. Monitoring method for double protection of IGBT collector overvoltage with safe and reliable performance

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