The design of complementary v.m.o.s.f.e.t. power inverters for supplying inductive loads

Although n-channel v.m.o.s.f.e.t.s have been commercially available for some years, reliable complementary p-channel devices with reasonably high-power ratings have only recently begun to appear on the market. Consequently there is as yet very little literature available on the design of power output circuits based on complementary v.m.o.s.f.e.t. topologies. This paper discusses the problems of topology selection and design of complementary v.m.o.s.f.e.t. power d.c. to a.c. inverters for supplying inductive loads. Special problems encountered in switching off devices supplying inductive loads are considered in the inverter context and the need for using driver stages with low output resistance due to the coupling effect of Miller capacitance is also explained.