一种高效率混合型全桥DC/DC转换器的设计

Design of a high efficiency hybrid full bridge DC/DC converter

为了降低损耗,提高DC/DC转换器的效率以及工作范围,提出了一种高效率的混合型全桥DC/DC转换器。其由移相全桥串联谐振转换器和带有倍压电路的有源钳位升压转换器组合而成,并使用电路结构简单的混合控制方案。在正常输入范围内,所提出的转换器作为相移全桥串联谐振转换器工作,通过在所有开关和整流二极管上应用软开关,并降低传导损耗,从而提高转换效率。当输入低于正常输入范围时,转换器作为有源钳位升压转换器工作,增强了工作范围。由于混合操作,所提出的转换器在正常输入范围下以比常规转换器更大的相移值进行工作。因此,所提出的转换器能够在较宽的工作范围内提供高功率转换效率。最后建立了一个1 k W的原理样机,来验证所提出转换器的有效性。

In order to reduce the loss and improve the efficiency and working range of the DC/DC converter, a high efficiency hybrid full bridge DC/DC converter is proposed. It is composed of a phase-shifted full-bridge series resonant converter and an active clamped boost converter with a voltage doubler circuit, and uses a hybrid control scheme with a simple circuit structure. In the normal input range, the proposed converter works as a phase-shifted full-bridge series resonant converter, which improves the conversion efficiency by applying soft switching on all switches and rectifier diodes and reducing the conduction loss. When the input is lower than the normal input range, the converter operates as an active clamp boost converter, which increases the operating range. Due to the hybrid operation, the proposed converter operates with a larger phase shift value than a conventional converter at the normal input range. Therefore, the proposed converter can provide high power conversion efficiency over a wide operating range. A 1 k W prototype is built to verify the theoretical analysis and effectiveness of the proposed converter.