Adaptive Voltage Control for Bidirectional Converter in Flicker-Free Electrolytic Capacitor-Less AC-DC LED Driver

作者：He, Jiexiu^*; Ruan, Xinbo; Zhang, Li

来源：IEEE Transactions on Industrial Electronics, 2017, 64(1): 320-324.

DOI：10.1109/TIE.2016.2608767

• Adaptive control
• bidirectional converter
• light-emitting diode (LED)
• LED driver
• power factor correction (PFC)

In this paper, an electrolytic capacitor-less ac-dc light-emitting diode (LED) driver, consisting of a power factor correction (PFC) converter and a buck/boost bidirectional converter, is investigated. The buck/boost bidirectional converter is connected in parallel with the output of the PFC converter and serves to absorb the second harmonic current in the PFC output current, leaving only a dc component to drive the LEDs. This paper proposes an adaptive voltage control scheme for the storage capacitor in the buck/boost bidirectional converter to make the storage capacitor voltage adaptively decrease as the load becomes lighter. Hence, the power losses of the buck/boost bidirectional converter could be reduced at light load. Experimental results are provided to verify the effectiveness of the proposed control scheme.

• 出版日期2017-1
• 单位南京航空航天大学