Dual Active Bridge DC-DC Converter based Wide Dimming Range LED Driver With High-Speed Turn-Off for High-Brightness LED Floodlight

抄録

This article proposes a dual active bridge (DAB) converter based wide dimming range LED driver with high-speed turn-off for high-brightness LED floodlight. In conventional LED drivers, the LED current does not turn off immediately due to the transient response of LED on-resistance and output smoothing capacitor. Furthermore, due to the constraint of minimum on-interval of MOSFET, the low LED current region is limited. DAB converter is a bidirectional DC-DC converter configured by two full-bridge converters and a transformer. The LED current feedback control is used for wide-range dimming control, and the LED voltage feedback control is used to achieve quick turn-off of the LED floodlight. Experimental results demonstrate that the proposed system is effective for LED drivers.