The analysis and evaluation for the leakage inductance effects of two front-end Dc/Dc converters with capacitive output filter

Chen Zhao, Xinke Wu, Z. Qian
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引用次数: 8

Abstract

Nowadays, with the rapid development of the consumer electronics, the power density of the power supply adapter is going to be much higher. To reduce the voltage stress on secondary-side rectifiers and the secondary-side conduction loss, the capacitive output filter is widely used, in the half-bridge LLC resonant converter and in the soft-switched phase-shift full-bridge converter with primary-side energy storage inductor for instance. However, compared with the inductance output filter, the capacitive output filter usually leads to relative large output current ripple, which makes the secondary-side leakage inductance of transformer suffer from the considerable volt-second balance. Thus, the practical voltage stress on the secondary-side rectifier should be considered more carefully. This paper shows the detailed analysis and evaluation for the leakage inductance effects of two front-end Dc/Dc converters with capacitive output filters. Some design considerations are also given for the engineers.
两种带电容输出滤波器的前端Dc/Dc变换器漏感效应分析与评价
在消费类电子产品快速发展的今天,对电源适配器的功率密度提出了更高的要求。为了减小二次侧整流器的电压应力和二次侧导通损耗,电容输出滤波器在半桥LLC谐振变换器和带一次侧储能电感的软开关移相全桥变换器中得到了广泛的应用。然而,与电感输出滤波器相比,电容输出滤波器通常会导致较大的输出电流纹波,这使得变压器的二次侧漏感遭受相当大的伏秒平衡。因此,应更仔细地考虑二次侧整流器的实际电压应力。本文对两种带电容输出滤波器的前端Dc/Dc变换器的漏感效应进行了详细的分析和评价。本文还给出了一些设计上的注意事项。
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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