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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...
In this paper, interleaved LLC half-bridge resonant converters are designed and implemented. In order to increase output power, two LLC resonant converters are parallel-connected. The gate driver signals of two LLC converters are interleaved by 90° to reduce output-current ripple. Besides, switch losses on power devices can be reduced by zero voltage switching (ZVS) and zero current switching (ZCS)...
In this paper, an AC-DC flyback converter with low power loss during low load condition is designed and implemented. A power loss model and breakdown of the quasi-resonant flyback converter is not only derived, but also analyzed with mathematic analysis software, MathCAD®. A new efficiency oriented burst mode control method is proposed to improve the system efficiency under standby condition. A laboratory...
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