| 摘要 |
A high efficiency static series resonant converter (22, 100, 200, 300) and method for converting power between two electric AC and/or DC circuits (24, 25; 124, 125; 224, 25; 24, 325) includes a resonant tank (60, 160) coupled to a link current synthesizer (70) for generating a train of unipolar link current pulses (Fig. 7) with controllable duration zero and nonzero current segments. A blocking switch (80) deactivates oscillation of the resonant tank (60, 160) in initiating each link current pulse, which is subsequently clamped by a buffer inductor (95). 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 (40, 50; 40, 150; 240, 50; 340, 50) constructed from unidirectional switches, such as low-cost and robust single thyristors.
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