DC-DC converter circuit for high input-to-output voltage conversion

摘要

The present invention provides a series of DC-DC converter circuit designs, and DC-DC converters based on such circuit design, that provide high input-to-output voltage conversion. The converters include a resonant tank and a means for interrupting the tank current to produce a near zero-loss “hold” state wherein zero current and/or zero voltage switching is provided, while providing control over the amount of power transfer. A resonant DC-DC converter for high voltage step-up ratio in accordance with the circuit design includes: (a) a low voltage DC-AC converter, (b) a resonant tank, (c) a high voltage AC-DC converter, (d) a (i) common ground on an input and an output without use of a transformer and/or (ii) a single high voltage controllable switch within the resonant tank.

主权项

1. A resonant dc-dc converter, comprising:
(a) a low voltage full-bridge or half-bridge dc-ac converter coupled to an input dc voltage at an input terminal of the dc-dc converter; (b) a resonant tank coupled to the dc-ac converter; (c) a high voltage ac-dc rectifier coupled to the resonant tank, and having an output terminal of the dc-dc converter; and (d) a controllable switch within the resonant tank, said controllable switch being controllable to periodically alternate between a first state and a second state and to periodically discontinue tank oscillation in the resonant tank by causing the converter to enter a hold state while the controllable switch is in the first state, and thereby periodically suspending power transfer by the dc-dc converter to control a rate of power transfer from the input terminal to an output terminal; wherein the hold state is caused by operating the controllable switch in a non-conducting state.