Design of dual gate driver for IGBT by using pulse transformers without saturation effect

In this paper a dual gate driver for IGBT capable of driving top and bottom switches of an inverter leg is proposed. This dual gate driver uses forward converter topology to provide necessary gate current to charge IGBT gate capacitance CGE along with isolation between control circuitry and power circuit. This gate driver will operate from 10% to 90% of duty cycle. The driver output is a two level signal which is positive during on period and negative during off period of the IGBT. To reduce the size of pulse transformer a gated oscillator of 1 MHz pulses of fixed duty cycle 50% and gated by PWM pulses of duty cycle range is used, this paper presents a new topology of two pulse transformers working at 1MHz with 50% duty cycle which complement each other and whose output pulses are added together to get the required pulses to drive IGBT´s.