Unipolar series resonant converter

Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter

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363 40, 363 98, 363132, H02M 5458, H02M 75387

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active

054125570

ABSTRACT:
A high efficiency static series resonant converter and method for converting power between two electric AC and/or DC circuits includes a resonant tank coupled to a link current synthesizer for generating a train of unipolar link current pulses with controllable duration zero and nonzero current segments. A blocking switch deactivates oscillation of the resonant tank in initiating each link current pulse, which is subsequently clamped by a buffer inductor. Each pulse is terminated by natural commutation through resonant oscillation. The pulses are substantially squarewave and have a high duty cycle leading to minimal peak current values. Minimal switching losses are incurred by switching at substantially zero voltage and zero current. Other features include blackout ride-through capability, bi-directional four quadrant operation, unbalanced load operation, voltage step-up without transformers, and input and output switch assemblies constructed from unidirectional switches, such as low-cost and robust single thyristors.

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Murai et al., "Pulse-Split Concept in Series Resonant DC Link Power Conversion for Induction Motor Drives," Conference Proceedings of the Industrial Application Society Meeting of 1991, pp. 776-781, (1991).

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