Circuit for improving the switching speed of a power electronic switching chip and applications thereof

A circuit for improving the switching speed of a power electronic switching chip, which comprises a power electronic switching chip and a simulated saturation conduction high voltage function setting circuit, wherein the simulated saturation conduction high voltage function setting circuit is connected with the power electronic switching chip to form a high-speed power electronic switching module;

• the simulated saturation conduction high voltage function setting circuit greatly increases the voltage of the “saturation” conduction of the power electronic switching chip and correspondingly greatly reduces the carrier density in the base region of the power transistor of the power electronic switching chip, thereby improving the switching speed of power electronic switching chip;
• the simulated saturation conduction high voltage function setting circuit includes NPN power transistor of power electronic switching chips, simulated saturation voltage setting voltage unit, clamping diode, load resistor Rf, drive pulse current limiting resistor Ri, supply voltage, drive pulse input terminal, drive pulse output end, simulated saturation voltage clamp terminal;
• the anode of the simulated saturation voltage setting voltage unit is connected to the base of the NPN type power transistor, which is the drive pulse output end, the cathode of the simulated saturation voltage setting voltage unit is connected with the anode of the clamping diode and the driving pulse input terminal, the cathode of the clamping diode is connected to the collector of NPN type power transistor via simulated saturation voltage clamping terminal, the conduction pulse is input to the drive pulse input terminal through the current limiting resistor via the pulse input terminal, and is connected to the base of the NPN type power transistor via the simulated saturation voltage setting voltage unit. In this way, the NPN power tube of the power electronic switching chip is conduced in the simulated saturation state of high conduction voltage.