Power efficiency improvement of a multi-oscillated current resonant type DC-DC converter

INTELEC 2009 - 31st International Telecommunications Energy Conference Pub Date : 2009-12-11 DOI:10.1109/INTLEC.2009.5351853

Tadahiko Sato, H. Matsuo, H. Ota, Y. Ishizuka, N. Higashi

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引用次数: 2

Abstract

This paper deals with an improvement of a power efficiency of a multi-oscillated current resonant type DC-DC converter. The current resonant type converter employs generally the pulse frequency modulation and its magnetizing inductance is set relatively low. For this reason, the magnetizing current through the converter causes a power loss under a light load. In order to solve this problem, a multi-oscillated current resonant type DC-DC converter has been proposed, and revealed the advantage of its control method which can reduce power loss under light load and keep low switching noise. In this topology, output power is controlled by duty ratio and operating frequency is determined by resonant condition. In this paper, an analysis of power loss by focusing on switching devices in this converter to improve power efficiency was given. As a result, it was confirmed that the loss of diodes in secondary side occupies main loss. Adopting the synchronous rectifier in the secondary side, the maximum power efficiency is improved to 96.3%, and the average efficiency, which is averaged efficiency at 25%, 50%, 75% and 100% of the rated load, reached 95.5%.

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多振荡电流谐振型DC-DC变换器的功率效率改进

本文研究了一种多振荡电流谐振型DC-DC变换器的功率效率改进方法。电流谐振型变换器一般采用脉冲调频，其磁化电感设置较低。因此，在轻负载下，通过变换器的磁化电流会造成功率损失。为了解决这一问题，提出了一种多振荡电流谐振型DC-DC变换器，并揭示了其控制方法的优点，该方法可以降低轻载下的功率损耗，同时保持低开关噪声。在该拓扑中，输出功率由占空比控制，工作频率由谐振条件决定。本文着重分析了该变换器中开关器件的功率损耗，以提高变换器的功率效率。结果表明，二次侧二极管损耗占主要损耗。二次侧采用同步整流器，最大功率效率提高到96.3%，在额定负荷25%、50%、75%、100%时的平均效率达到95.5%。

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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INTELEC 2009 - 31st International Telecommunications Energy Conference

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