A design of low cost gate drive using a single power supply for a threephased inverter

Abstract

This paper presents a design of low cost gate drive using a single power supply for driving
MOSFETs of a three-phased inverter. A gate drive circuit consists of an optocoupler which is used for
isolating signal. A pair of complementary transistor is biased in common collector circuit and is used
to drive the MOSFETs. In the circuit of the supply, a diode is used as short circuit protection and a
capacitor is used to collect energy for supplying power to a gate drive circuit. The experimental result
showed that the inverter could work with both resistive and inductive loads. Applying this principle in
the three-phased inverter, six power supplies could be reduced to one power supply. Therefore, the
inverter is cheaper , smaller and easier to assemble.