Reducing commutating noise in power MOSFET based circuit - using three half bridge circuits each having two pairs of MOSFET devices in parallel, and coupled by diodes, for three=phase inverter function

摘要

The method involves using a 3 phase pulse inverter circuit which has an intermediate rectified voltage (UD) input. The inverter unit is formed by 3 half bridges (A,B,C) and is used to supply an inductive load (6), e.g. motor or transformer. Each half bridge circuit is formed from pairs of MOSFET transistors (1,2,1',2') that have each pair formed as series arrangements that are in parallel with each other. Each half bridge circuit is coupled via diodes (3,4). Phase outputs (RST) are taken from the centre points. ADVANTAGE - Avoids commutation losses in pulsed MOSFET inverter circuitry.