具有负载无关软开关能力的PWM全桥变换器

APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058) Pub Date : 2000-02-06 DOI:10.1109/APEC.2000.826087

G. Moschopoulos, P. Jain

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引用次数: 29

摘要

虽然零电压开关(ZVS)脉宽调制(PWM)全桥(FB)变换器可以在软开关和固定频率控制下工作，但在轻负载条件下失去了其ZVS能力。本文研究了附加到标准ZVS- pwm - fb转换器底部开关的辅助电路的使用，作为扩展ZVS范围的一种手段。辅助电路，每个由一个有源开关和无源元件组成，只在开关周期的一小部分工作，并且处理很少的功率。本文详细阐述了这类改进型ZVS-PWM-FB变换器的基本工作原理，并给出了其设计的一般指导原则。推导了设计过程，并在实例转换器上进行了演示。实验样机的结果证明了该变换器的可行性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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A PWM full-bridge converter with load independent soft-switching capability

Although the zero-voltage switched (ZVS) pulsewidth modulated (PWM) full-bridge (FB) converter can operate with soft-switching and fixed frequency control it loses its ZVS capability under light-load conditions. This paper examines the use of auxiliary circuits attached to the bottom switches of the standard ZVS-PWM-FB converter as a means of extending the ZVS range. The auxiliary circuits, each consisting of an active switch and passive components, operate for only a small portion of the switching cycle, and handle very little power. The basic operating principles of these type of modified ZVS-PWM-FB converters are explained in detail in the paper, and general guidelines for their design are given. A design procedure is derived and demonstrated on an example converter. The feasibility of this converter is shown with results obtained from an experimental prototype.

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APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058)

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