Limit Operating Frequency of Peak Current-Mode Control DC-DC Converter Considering Turn-Off Delay Time

2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia) Pub Date : 2018-10-22 DOI:10.23919/IPEC.2018.8507512

Ryo Ute, Kazuya Fujiwara, J. Imaoka, M. Shoyama

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引用次数: 1

Abstract

The aim of this paper is to present the mechanism of the frequency dividing operation and the limit operating frequency in the peak current-mode control DC-DC converter considering the turn-off delay time. The peak current mode control has the higher stability and the responsiveness than the conventional voltage mode control. However, if the switching frequency is increased ignoring the turn-off delay time, it would become the frequency dividing operation that the switching frequency operates lower than the clock frequency at the certain frequency. In this operation, there is a problem that the switching loss increases and the high frequency switching drive is hindered. In this paper, we clarified the mechanism of the dividing frequency operation and derived the relationship between the turn-off delay time and the limit operating frequency. Also, we derived the relationship when the slope compensation is applied as well. As experimental results, when there is the turn-off delay time, it was confirmed that the limit operating frequency of the DC-DC converter was limited to lower as the duty ratio was lower and the slope ratio of the slope compensation is close to 1.0.

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考虑关断延迟时间的峰值电流型控制DC-DC变换器极限工作频率

本文的目的是给出考虑关断延迟时间的峰值电流型控制DC-DC变换器的分频工作机理和极限工作频率。与传统的电压模式控制相比，峰值电流模式控制具有更高的稳定性和响应性。但是，如果忽略关断延迟时间而提高开关频率，则在某一频率下开关频率低于时钟频率的分频操作。在这种操作中，存在着开关损耗增大，阻碍高频开关驱动的问题。本文阐明了分频工作的机理，推导出了关断延时时间与极限工作频率的关系。此外，我们还推导了在进行斜率补偿时的关系。实验结果表明，当存在关断延迟时间时，由于占空比较低，且斜率补偿的斜率比接近1.0，因此DC-DC变换器的极限工作频率被限制在较低。

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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2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)

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