| 引用本文: | 吴松荣,许建平,龚华彬,周国华,王金平.双频率控制开关变换器低频波动现象抑制方法[J].电力自动化设备,2014,34(1): |
| WU Songrong,XU Jianping,GONG Huabin,ZHOU Guohua,WANG Jinping.Low-frequency oscillation suppression of bi-frequency controlled switching converter[J].Electric Power Automation Equipment,2014,34(1): |
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| 摘要: |
| 针对传统双频率控制技术应用于电感电流连续导电模式开关变换器时存在的电感电流和输出电压低频波动问题，在介绍该技术控制原理的基础上，建立了输出电容储能迭代模型，利用该模型揭示了一个开关周期内电感储能变化量不为零是产生低频波动现象的根本原因。为解决此问题，通过将电感电流信息引入反馈控制环路，提出并研究了峰值电流型固定关断时间双频率控制技术，分析了该技术的工作原理和低频波动现象抑制机理。通过与传统双频率控制技术进行仿真和实验对比研究，结果表明峰值电流型固定关断时间双频率控制方法能够有效抑制低频波动现象的发生。 |
| 关键词: 变换器 双频率控制 低频波动 峰值电流型 固定关断时间 |
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| 基金项目:国家自然科学基金资助项目（51177140）；中央高校基本科研业务费专项资金资助项目（SWJTU11CX032） |
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| Low-frequency oscillation suppression of bi-frequency controlled switching converter |
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WU Songrong1, XU Jianping1, GONG Huabin1, ZHOU Guohua1, WANG Jinping2
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1.School of Electrical Engineering，Southwest Jiaotong University，Chengdu 610031，China;2.School of Electrical Engineering and Automation，Hefei University of Technology，Hefei 230009，China
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| Abstract: |
| Aiming at the low-frequency oscillation of inductor current and output voltage existing in traditional bi-frequency controlled switching converter operating in continuous conduction mode，the principle of bi-frequency technology is introduced and the energy iterative model of output capacitor is established，which reveals that，it is the non-zero total energy stored in inductor covering a complete switching period that causes the low-frequency oscillation. To solve the problem，the inductor current is fed into the control loop and the constant off-time bi-frequency control in peak-current mode is proposed，which is investigated in the operating principle and oscillation suppression. Simulative and experimental results show that，compared with the traditional bi-frequency control，the proposed method suppresses the low-frequency oscillation more effectively. |
| Key words: electric converters bi-frequency control low-frequency oscillation peak current mode constant off-time |
