| 一种新型的CCM PFC软开关技术研究 |
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| 引用本文： | 柴玉华,苑志刚,刘伟丽.一种新型的CCM PFC软开关技术研究[J].电测与仪表,2012,49(2):90-92. |
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| 作者姓名： | 柴玉华 苑志刚 刘伟丽 |
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| 作者单位： | 东北农业大学工程学院 |
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| 摘 要： | 为降低电源设备对电网的谐波污染,功率因数校正技术已被广泛应用于电力电子设备中,且绝大多数PFC采用Boost电路。在中等及以上功率等级时PFC常采用电流连续模式,而功率二极管由于存在反向恢复特性,开关管的开通损耗被大大增加,电磁干扰加重。本文提出了一种新的无源无损缓冲电路,其能够抑制二极管的反向恢复特性,减小开关管的开通损耗。新电路的加入未引入开关管额外的电压应力,电路结构简单,软开关实现范围大,500 W实验样机验证了PFC效率能被大大提高。
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| 关 键 词： | 功率因数校正 Boost电路 电流连续模式 软开关 |
Research on CCM PFC Soft Switching Technology |
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| CHAI Yu-hu,YUAN Zhi-gang,LIU Wei-li.Research on CCM PFC Soft Switching Technology[J].Electrical Measurement & Instrumentation,2012,49(2):90-92. |
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| Authors: | CHAI Yu-hu YUAN Zhi-gang LIU Wei-li |
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| Affiliation: | (College of Engineering,Northeast Agricultural University,Harbin 150030,China) |
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| Abstract: | Power factor correction technology has been widely used in power electronic applications to reduce the harmonic pollution on power grids.Boost converter is the most popular alternative.In the medium or greater power ratings,the continuous current mode is adopted usually.However,the reverse recovery characteristic of power diode enlarges the switch turning-on loss and the electromagnetic interference is aggravated also.In this paper,a novel passive lossless snubber is proposed.It could solve the above issues.The adding of this snubber does not introduce the extra voltage stress to the switch.It has simple circuit structure and soft switching conditions are satisfied easily.The 500W prototype validates that the efficiency of PFC is improved greatly. |
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| Keywords: | power factor correction Boost converter current continuous mode soft switching |
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