Zero-voltage-switched multi-resonant converters including the bu

Details Zero-voltage-switched multi-resonant converters including the bu Zero-voltage-switched multi-resonant converters including the bu

1988-04-11

1989-08-15

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323235, 363 16, 363 40, 363127, G05F 156

Patent

active

048578223

ABSTRACT:
A multi-resonant-switching network that operates under switching conditions that are favorable to both the active switch and the diode that constitute the switch. In a zero-current multi-resonant switch, the resonant circuit is formed in a T-network with resonant inductors in series with the switching devices. In a zero-voltage multi-resonant switch, the resonant circuit is formed in a .pi.-network with resonant capacitors connected in parallel with the switch. In this way, the two networks are dual. During operation of a multi-resonant converter, a multi-resonant switches forms three different resonant circuits depending on whether the active switch and diode are open or closed. This results in operation of the converter with three different resonant stages in one cycle of operation. In practicing the present invention, certain rules are applied to derive a ZVS-MRC from a PWM converter. In particular, one resonant capacitor is placed in parallel with the active switch, which may be either uni-directional or bi-directional, another resonant capacitor is placed in parallel with the rectifying diode, and an inductor is inserted in the loop containing the switch and the diode. This loop can also contain voltage sources and filter or blocking capacitors. Improvement in the operation of ZVS-MRCs is obtained with synchronous rectification which is achieved by replacing rectifying diodes in a DC/DC converter with active devices, called synchronous rectifiers.

REFERENCES:
patent: 4399499 (1983-08-01), Butcher et al.
patent: 4449174 (1984-05-01), Ziesse
patent: 4605999 (1986-08-01), Bowman et al.
patent: 4716514 (1987-12-01), Patel
patent: 4720667 (1988-01-01), Lee et al.
patent: 4720668 (1988-01-01), Lee et al.

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