恒定导通时间电容电流控制Buck变换器研究

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摘要由于输出电容电压相位滞后电感电流相位,当输出电容等效串联电阻(ESR)较小时,恒定导通时间V²(V²-COT)控制Buck变换器将工作在不稳定状态。针对该问题,提出开关变换器的恒定导通时间电容电流(CC-COT)控制技术,并阐述了其工作原理。通过基于描述函数法建立的小信号模型和Routh-Hurwiz判据,研究CC-COT控制Buck变换器的稳定性。研究结果表明,CC-COT控制技术具有快速瞬态响应速度,且不存在因输出电容ESR较小而引起的不稳定现象。

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	张希
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关键词 ：电容电流, 恒定导通时间V²控制, 等效串联电阻, 稳定性, 瞬态响应

Abstract：For the constant on-time V² (V²-COT) controlled buck converter,when the output capacitor with small equivalent series resistance (ESR) is used,it will operate in the unstable state because the output voltage phase lags behind the inductor current phase.To solve the problem,a constant on-time capacitor current (CC-COT) control technique for switching converter is proposed and its operational principle is elaborated.Based on the small signal model established by describing function method,the stability of CC-COT controlled buck converter is studied by using the Routh-Hurwitz criterion.The study results show that the CC-COT control technique has fast transient response characteristic and can eliminate the instability caused by the small ESR of the output capacitor.

Key words： Capacitor current constant on-time V² (V²-COT) control equivalent series resistance (ESR) stability transient response

收稿日期: 2015-01-05 出版日期: 2015-12-18

PACS:

TM315

基金资助:国家自然科学基金(51177140、61371033)资助项目。

通讯作者: 沙金女,1987年生,博士研究生,研究方向为开关变换器拓扑及控制方法。

作者简介: 张希男,1985年生,博士研究生,研究方向为开关功率变换器控制技术及其动力学

引用本文:

张希, 沙金, 徐杨军, 许建平, 陈兴. 恒定导通时间电容电流控制Buck变换器研究[J]. 电工技术学报, 2015, 30(23): 18-23. Zhang Xi, Sha Jin, Xu Yangjun, Xu Jianping, Chen Xing. Research on the Constant On-time Capacitor Current Control of Buck Converters. Transactions of China Electrotechnical Society, 2015, 30(23): 18-23.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I23/18

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