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To improve the efficiency performance for the dc-dc converter used in extra wide input range applications, a novel resonant converter with a combinatorial LLC+C tank is proposed in this paper. The proposed resonant tank has a hybrid operational mode, which can operates as LLC resonant tank for high line input or as LLCC resonant tank for the low line input, realized by the topology shift through the...
A bidirectional DC-DC converter (BDC) with a new CLLC-type resonant tank, which features zero-voltage switching (ZVS) for the input inverting choppers and zero-current switching (ZCS) for the output rectifier switches, regardless of the direction of the power flow, is proposed in this paper. Possessing the very optimal ZVS +ZCS soft-switching feature, this proposed converter will have a minimized...
In this paper, A novel ZVZCS active clamped dual switch flyback converter was proposed, whose main switches and auxiliary switch all realize zero-voltage turning-on, and the rectifier diode on the secondary side also achieves ZCS. It overcomes the demerit of high voltage stress on the main switch in conventional flyback converter; meanwhile the duty circle can extend to more than 50% by slope compensation...
To overcome the complicated strategy and circuit implementation issue for control of the conventional ZCS converter to derive the driving signal for the auxiliary switch, a novel ZCT cell which greatly simplifiers the control strategy by directly extending the duty duration to be the whole off-time of the primary switch is proposed in this paper, where the control circuit is implemented only by a...
In this paper, a novel ZCZVS asymmetrical dual switch forward converter with a ZCS cell is proposed. The proposed active clamp circuit helps primary switches to realize zero-voltage switching and to expend the duty cycle, while the proposed ZCS cell helps to realize zero-current switching on primary switches and the rectifier diode. All the primary semiconductor devices turn on and off under soft...
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