Switch ringing suppression circuit based on gate driver and control method thereof

Abstract

The invention discloses a switch ringing suppression circuit based on a gate driver and a control method thereof, and belongs to the field of power electronic devices and control. The circuit comprises a driving circuit, an ADC sampling circuit and a main control unit, wherein the driving circuit comprises a programmable digital voltage source and a current expanding circuit, and the main controlunit comprises a data detector, a driving waveform generator and a power switch controller. A driving waveform generator in the main control unit outputs signals and transmits the signals to the programmable digital voltage source, the power switch controller outputs signals and transmits the signals to the current expanding circuit, and the data detector receives and processes the data sent by the sampling circuit. The sampling circuit measures the current flowing through the measured power switch tube and is connected with the collector / drain of the measured power switch tube. According to the invention, the ringing phenomenon of the power switch tube is suppressed by adjusting the driving waveform, and for different types of power switch tubes or different load conditions, the voltage value of ringing suppression only needs to be adjusted through a program. The ringing phenomenon is suppressed without changing the structure of the converter, and the reliability of the converter is improved.

Description

technical field [0001] The invention relates to a switch ringing suppression circuit based on a gate driver and a control method thereof, belonging to the field of power electronic devices and control. Background technique [0002] The dominant position in the power electronic converter is the voltage-type converter, which is characterized by the constant voltage polarity of the DC side and the bidirectional conduction of the current. The voltage-type converter usually uses an asymmetric turn-off power device and a diode of the same capacity in antiparallel connection to form the switching valve of the converter. The reverse recovery characteristics of the diode and the parasitic parameters in the converter circuit will cause The ringing phenomenon produces electromagnetic interference problems, affects high-speed signals in equipment, and seriously reduces the reliability of power devices and converters. [0003] The essence of the ringing phenomenon is a damped oscillatio...

AI Technical Summary

Problems solved by technology

However, if the capacitance of the RLC absorption circuit is too large, it will cause the power device to heat up and cause thermal breakdown. If the capacitance is too small, the absorption capacity for ringing is insufficient.

Compact line layout can reduce the parasitic inductance of the bus, but it will also cause heat accumulation of the converter under long-term operation

Adding resistance in the drive loop slows down the rise time of the signal, resulting in an increase in the dead time of the half-bridge circuit, increasing additional losses, and reducing the efficiency of the converter

In addition, the above three methods require custom design for each different power transistor, increasing development cost and design time

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