ABSTRACT An efficient ripple-free light-emitting diode (LED) driver circuit is proposed with zero-voltage switching (ZVS) and dimming control. The proposed driver circuit utilizes a full-bridge configuration. The LED lamp current is the sum of two inductor currents which are out of phase. This makes the LED lamp current ripple free. Larger portion of lamp power is supplied by the dc voltage source connected in series with LED lamp. Small amount of power is processed by bridge circuit. Devices of the bridge circuit conduct only ripple current of the load inductor and a small current of an inductor which helps in ZVS. Hence, both conduction and switching losses are reduced. In addition, LED lamp current can be regulated at required operating current. The dimming feature is attained by on-off control method. This proposed configuration also helps in reducing components count. An experimental prototype of 87 W has been developed and tested at full load and different dimming levels. Experimental results validate simulation results.

中文翻译：

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用于街道照明应用的具有零电压开关的高效无纹波 LED 驱动器

摘要 提出了一种具有零电压开关 (ZVS) 和调光控制的高效无纹波发光二极管 (LED) 驱动器电路。建议的驱动器电路采用全桥配置。LED 灯电流是两个异相电感电流之和。这使得 LED 灯电流纹波无。大部分灯功率由与 LED 灯串联的直流电压源提供。小功率由桥接电路处理。桥式电路的器件仅传导负载电感器的纹波电流和有助于 ZVS 的电感器的小电流。因此，传导和开关损耗都降低了。此外，LED 灯电流可以调节到所需的工作电流。调光功能是通过开关控制方法实现的。这种建议的配置还有助于减少组件数量。一个 87 W 的实验原型已经在满载和不同的调光水平下开发和测试。实验结果验证了仿真结果。