Single-Stage Single-Switch PFC Flyback Converter Using a Synchronous Rectifier
Single-Stage Single-Switch PFC Flyback Converter Using a Synchronous Rectifier
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DOI：
10.1109/tie.2007.911908
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发表时间：
2008-03
影响因子：
7.7
通讯作者：
Jong-Jae Lee;Jung-Min Kwon;Eung-Ho Kim;W. Choi;B. Kwon
中科院分区：
文献类型：
--
作者：
Jong-Jae Lee;Jung-Min Kwon;Eung-Ho Kim;W. Choi;B. Kwon
为了提高功率因数和效率，提出了一种带同步整流器的单级单开关功率因数校正（PFC）反激变换器。该变换器采用可变开关频率控制器，在连续导通模式和断续导通模式（DCM）的边界处，以较低的导通开关损耗连续工作。该PFC电路在通用线路电压中提供相对较低的直流电压，并符合标准IEC 61000-3-2 D类限值。此外，提出了一种新的驱动电路作为电压驱动同步整流器，以实现高效率。特别是，由于驱动信号是根据电压极性产生的，因此SR驱动电路可以很容易地用于DCM应用。对该反激变换器中的PFC电路和SR驱动电路进行了详细的分析，并对其进行了优化。在30~70 kHz可变开关频率下，对19 V/90 W转换器进行了实验，验证了该转换器的性能。
A single-stage single-switch power factor correction (PFC) flyback converter with a synchronous rectifier (SR) is proposed for improving power factor and efficiency. Using a variable switching-frequency controller, this converter is continuously operated with a reduced turn-on switching loss at the boundary of the continuous conduction mode and discontinuous conduction mode (DCM). The proposed PFC circuit provides relatively low dc-link voltage in the universal line voltage, and also complies with Standard IEC 61000-3-2 Class D limits. In addition, a new driving circuit as the voltage driven-synchronous rectifier is proposed to achieve high efficiency. In particular, since a driving signal is generated according to the voltage polarity, the SR driving circuit can easily be used in DCM applications. The proposed PFC circuit and SR driving circuit in the flyback converter with the reduced switching loss are analyzed in detail and optimized for high performance. Experimental results for a 19 V/90 W adapter at the variable switching-frequency of 30~70 kHz were obtained to show the performance of the proposed converter.