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For many LED applications, the dimming control is required in saving the energy consumptions. However, the wide-range dimming cannot be achieved due to the minimum on-time and switching frequency at low dimming level. In this paper, a buck-type wide-range dimmable LED driver is designed and implemented. According to the different percentage of dimming, the buck converter can operate in QR mode, frequency...
In this paper, the design and implementation of a non-electrolytic capacitor LED driver is proposed. The proposed driver includes a Boost PFC converter as first-stage and a LLC Resonant Converter as second-stage. With feedforward control, the output current ripple can be reduced without electrolytic capacitor, the lifetime of the driver will be increased. In this paper, the operating principles of...
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