科研之友
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摘要
In this paper, a step-up active-clamp SEPIC converter with bi-transformer is presented for battery sourcing application. Two transformers are used in the conventional SEPIC converter and connected in series at secondary side to achieve high voltage conversion ratio. Active-clamp circuit including one auxiliary switch and one clamp capacitor is connected in parallel with the main switch to allow the resonant behavior by the output capacitances of switches and transformer leakage inductance during the transition interval. Thus the ZVS turn-on of switches can be achieved. The switching losses and thermal stresses of the semiconductors are reduced. The interleaved operation in output side reduces the ripple current and the output capacitance. Based on the circuit configuration, the voltage stresses of secondary diodes are clamped to V(o) such that no snubber circuit is needed on the rectifier diodes. The circuit configuration, operation principle and design consideration of the converter are discussed in detail. Finally, experiments, based on a laboratory prototype with 48V input and 200V/2A output, are provided to verify the theoretical analysis and the effectiveness of the proposed converter.
- 出版日期2011-4
