引用本文: | 刘雪山,许建平,王 楠.临界连续模式单电感双输出Buck功率因数校正变换器[J].电力自动化设备,2015,35(5): |
| LIU Xueshan,XU Jianping,WANG Nan.SIDO Buck PFC converter operating in critical continuous conduction mode[J].Electric Power Automation Equipment,2015,35(5): |
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摘要: |
提出了一种临界连续模式(CRM)单电感双输出(SIDO)Buck功率因数校正(PFC)变换器及其控制策略,并分析了其工作特性。通过对电感的分时复用控制,实现了2个输出支路的独立控制。在输入电压接近各输出支路电压情况下,控制器限制了开关管的最小关断时间,解决了工作于CRM时电感在输入电流过零点附近难以分时复用控制的问题,并抑制了电感在输入电流过零点附近的复用频率。相对于传统两级结构的多路输出PFC变换器,CRM SIDO Buck PFC变换器减少了控制器与电感的数量,降低了变换器的体积与成本,并提高了变换器的效率。实验结果验证了所提变换器高效率、高功率因数以及2个输出支路的高输出精度控制特性。 |
关键词: Buck 变换器 功率因数校正 单电感双输出 临界连续模式 单级结构 分时复用控制 |
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基金项目:国家自然科学基金资助项目(51177140,61371033);中央高校基本科研业务费专项资金资助项目(2682013ZT20);高等学校博士学科点专项科研基金资助项目(20130184120011) |
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SIDO Buck PFC converter operating in critical continuous conduction mode |
LIU Xueshan, XU Jianping, WANG Nan
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Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle,Ministry of Education,School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China
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Abstract: |
A kind of SIDO(Single-Inductor Dual-Output) Buck PFC(Power Factor Correction) converter operating in CRM(CRitical continuous conduction Mode) is proposed with the control strategy and its operating characteristics are analyzed. The time-sharing multiplexing of the single inductor is controlled to achieve the independent regulation of two output circuits. The minimum turn-off time of power switch is limited by the controller when the input voltage is close to the voltage of each output branch for facilitating the time-sharing multiplexing control and reducing the multiplexing frequency when the inductor is operating in CRM and the input current is near the zero-crossing point. Compared with the conventional two-stage multi-output PFC converter,this SIDO PFC converter has less controller and inductor,resulting in smaller size,lower cost and higher efficiency. Experimental results show the excellent control performance of the proposed converter:high efficiency,high power factor and high output accuracy. |
Key words: Buck electric converters power factor correction single-inductor dual-output critical continuous conduction mode single stage time-sharing multiplexing control |