本文从理论上分析了影响开关电源效率的各种因素，并给出了提高效率的途径和方法。

This paper analyses kinds of reason that affect efficiency of serial switch supply from theory, and gives the way to increase the efficiency of serial switch supply.

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有鉴于此，论文重点围绕高效率开关电源控制芯片的开发，尤其是轻载条件下提高开关电源效率的技术开展研究。

Therefore, the thesis emphasized on the design of high efficient switch power supply controller, especially the improvement of the efficiency under light load condition.

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本文介绍一种新型的直流开关电源，该电源是一种直流电压输入，三种直流电压输出，并能够达到相当高的效率。

A new type of DC switch power which is possessed a DC voltage input and three DC voltage output, and is able to reach higher efficiency has been introduced in this paper.

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