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首页> 外文期刊>Power Electronics, IET >Implementation of a parallel zero-voltage switching DC-DC converter with fewer active switches
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Implementation of a parallel zero-voltage switching DC-DC converter with fewer active switches

机译：用更少的有源开关实现并联零电压开关DC-DC转换器

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摘要

A parallel soft-switching DC-DC converter with fewer switch count is presented to achieve zero-voltage switching (ZVS), load current sharing and partially output ripple current cancellation. Two buck-type converters are connected in parallel to achieve load current sharing. Only two MOSFETs are used in the proposed converter instead of four switches in a conventional parallel ZVS forward converter. Therefore the proposed converter has fewer active switches. Current-doubler rectifiers are used in the output side in order to achieve partially ripple current cancellation. Therefore the current ripple on output capacitor is decreased and the size of the output choke and output capacitor are reduced. An active snubber is connected between two power transformers to absorb the energy stored in the leakage and magnetising inductances of transformers, to limit voltage stresses across switches, and to achieve ZVS turn-on for all switches. The ZVS turn-on is implemented in the transition interval of two complementary switches such that the switching losses and thermal stresses on semiconductors are reduced. Operation principle, circuit analysis and design example are discussed in detail. Finally, experimental results for a 360-W (12-V/30-A) prototype were presented to verify the effectiveness of the proposed converter.
机译：提出了一种具有较少开关数量的并联软开关DC-DC转换器，以实现零电压开关（ZVS），负载电流共享和部分输出纹波电流消除。两个降压型转换器并联连接以实现负载电流共享。建议的转换器中仅使用两个MOSFET，而不是传统的并行ZVS正向转换器中使用四个开关。因此，所提出的转换器具有较少的有源开关。在输出侧使用倍增整流器，以实现部分纹波电流消除。因此，减小了输出电容器上的电流纹波，并且减小了输出扼流圈和输出电容器的尺寸。一个有源缓冲器连接在两个电源变压器之间，以吸收存储在变压器的泄漏和励磁电感中的能量，以限制开关两端的电压应力，并实现所有开关的ZVS导通。在两个互补开关的过渡间隔内实现ZVS导通，从而降低了开关损耗和半导体上的热应力。详细讨论了工作原理，电路分析和设计实例。最后，给出了360W（12-V / 30-A）原型的实验结果，以验证所提出转换器的有效性。

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