一种单级无桥式高功率因数无电解电容AC-DC LED驱动器

doi:10.19595/j.cnki.1000-6753.tces.180831

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Abstract The bulky electrolytic capacitor used to compensate the difference of pulsating power needs to restrict the driver lifetime. The full bridge rectification structure causes the conduction loss to increase, and the existing drivers adopting Pulse Frequency Modulation (PFM) is bound to arouse heavy electromagnetic interference (EMI). Therefore, the Series Resonant Converter (SRC) based LED driver is proposed for attenuating the low frequency ripple delivered from the Power Factor Correction (PFC) to LEDs, thereby reducing the capacitance for energy storage of off-line LED drivers. The Switching Controlled Capacitor (SCC) is used to replace the fixed capacitor, and the constant frequency operation (CFO) is realized by changing the equivalent capacitance. In addition, the sharing of SCC and half-bridge switching unit not only increases the circuit power density, but also eliminates the full-bridge rectifier diode. Finally, the superior performance of the proposed LED driver is verified by PSIM simulation and a 2-channel LED prototype with an output power of 80W.

Key words： LED driver constant-frequency operation series resonant converter power factor correction (PFC) switching controlled capacitor (SCC)

Received: 14 May 2018 Published: 02 September 2019

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	Liang Guozhuang
	Tian Hanlei
	Wang Ziyuan
	Ren Xiaoning

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Liang Guozhuang,Tian Hanlei,Wang Ziyuan等. A Single-Stage Bridgeless, Electrolytic Capacitor-Free AC-DC LED Driver with High Power Factor[J]. Transactions of China Electrotechnical Society, 2019, 34(16): 3396-3407.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180831 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I16/3396

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