Conventional MOSFET isolation driving circuit has problems of small variation frequency range

low duty ratio and severe waveform distortion. In this paper

based on the application of MOSFET switching tube in pulsed electron beam welding power source

a MOSFET driving circuit with wide frequency and duty cycle is designed to overcome the defects of the traditional transformer isolation drive circuit. In the circuit

a carrier modulation method is adopted to transmit signals and a pulse transformer is adopted to achieve voltage isolation. The operating principle and parameter design of driving circuit are analyzed in detail. The completed driving circuit can isolate up to 60 kV high voltage from the control circuit. The rising time and falling time of driving signal are respectively 0.3 μs and 1.8 μs. Moreover

the waveform quality of driving signal is free from the influence of duty ratio

and the pulse signal with 0～100% duty ratio can transmit in the designed driving circuit. The driving circuit can meet the requirements of transmission of 0～20 kHz PWM signal and isolation of pulsed electron beam welding power supply

which lays a foundation for the wide application of MOSFET power switch tubes in high voltage and high power fields.