Zero-voltage switching quasi-resonant converters

Details Zero-voltage switching quasi-resonant converters Zero-voltage switching quasi-resonant converters

1986-06-20

1988-01-19

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323235, G05F 140

Patent

active

047206683

ABSTRACT:
A quasi-resonant converter is disclosed as comprising a power source, a load and a resonant switch circuit for periodically connecting the power source to the load. The resonant switch circuit includes a switch for connecting the power source to the load and for disconnecting the power source from the load, and a resonant circuit comprised of a resonant capacitor and a resonant inductor. The switch is operated at a switching frequency in excess of 1 MHz and in the order of 10 to 20 MHz or greater. The resonant circuit is connected to the switch to impose thereon a voltage waveform as developed across the resonant capacitor. The resonant capacitor and the resonant inductor have respective impedances selected to shape the voltage waveform such that a zero-voltage condition is imposed upon the switch when it is disposed to its on state, whereby the parasitic capacitive losses associated with the switch are eliminated.

REFERENCES:
patent: 4016461 (1977-04-01), Roland
patent: 4168477 (1979-09-01), Burchall
patent: 4323845 (1982-04-01), Leach
patent: 4417197 (1983-11-01), Schwarz
patent: 4546421 (1985-10-01), Bello et al.
patent: 4585986 (1986-04-01), Dyer
patent: 4592763 (1986-06-01), Dietz et al.
patent: 4620271 (1986-10-01), Musil

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