LED driver based on novel ripple cancellation technique for flicker‐free operation and reduced power processing

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Abstract
Light‐emitting‐diode (LED) drivers are required to maintain the power quality of both the AC input and DC output side. The regulation prevents adverse impacts on the grid and maintains the nominal operating condition of LEDs. Without significant filtering, the input power from a single‐phase AC source can result in low‐frequency flickers that raise health issues. This study proposes a LED driver topology to achieve low harmonics at the AC side and maintain flicker‐free operation to drive LEDs. A novel ripple‐cancelling scheme is developed to minimise redundant power processing and reduce circuit complexity to achieve high‐conversion efficiency. The new topology supports a simple control strategy to operate the driver effectively. Experimental evaluation demonstrates the system performance and verifies the novelty and contribution.

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