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This study presents a four-phase interleaved buck converter with low voltage stress and high step-down conversion ratio. The proposed converter provides an extended duty cycle and low voltage stress for switches and diodes, in high step-down applications. This makes it possible to use switches with lower voltage rating and thus reduce both switching and conduction losses to improve the overall efficiency. Extremely low output current ripple and continuous input current are two other advantages of the proposed converter. Also, the output current can be shared between interleaved modules without using additional current sharing control technique due to charge balance of input and blocking capacitors. All these benefits are obtained without adding any active auxiliary component or using transformers. The experimental results from a prototype of the proposed converter designed for 400-24 V, operating at 0.5 kW, verify the theoretical analysis.

An interleaved zero-voltage-transition (ZVT) pulse-width modulation (PWM) buck converter is proposed in this study. The proposed converter consists of two identical buck converters connected in parallel and an auxiliary circuit. The auxiliary circuit has only one active switch. Zero-voltage switching condition for main switches and also, zerocurrent switching condition for the auxiliary circuit semiconductor components are achieved. Principle of operation and analysis of the proposed converter is provided. Moreover, the extension of the proposed idea to interleaved buckboost, interleaved flyback and interleaved forward converters are presented. A 160 W prototype of the proposed ZVT PWM buck converter is implemented and the results are presented to verify the validity of theoretical analysis.

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This study presents a family of zero voltage transition (ZVT) interleaved converters which utilises a simple auxiliary cell. The ZVT cell has only a single auxiliary switch for multi-phase interleaved converters. In the proposed converters, all semiconductor devices operate under fully soft switching condition. The main switches turn on and turn off under zero voltage switching (ZVS) condition while the auxiliary switch turns on and turns off under zero current switching (ZCS) condition. Besides, all the converter main and auxiliary diodes turn off under ZCS condition which alleviates the diodes reverse recovery problem. The ZVT cell imposes no extra current and voltage stresses on the semiconductor devices. The effectiveness of the proposed method is evaluated by a 100 kHz, 200 W two-phase interleaved boost converter and the theoretical analysis and design procedure are discussed in detail. Furthermore, the results of an implemented laboratory prototype are provided which are consistent with the theoretical analysis.

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