Abstract
In this article, a non-isolated resonant light-emitting diode (LED) driver based on the LCLC resonant network is presented. The adopted LCLC network can provide load-independent current for LED string, also, the soft switching range and the semiconductor devices RMS current can be optimized within the entire range of the input and output voltage using the LCLC network parameters. A single auxiliary switch is employed for regulating the output current within a wide input voltage range using PWM control. In addition, the employed auxiliary switch can provide PWM dimming and open-load protection features. Detailed theoretical analysis including the operating modes and soft switching conditions of the proposed LED driver is presented, and the impact of the auxiliary switch snubber capacitor on the load-independent output current characteristic is analyzed. To verify the analysis and effectiveness of the proposed topology operation, a 40 W laboratory prototype with the input voltage range of 80 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$-$</tex-math></inline-formula> 230 V is designed and implemented which delivers 0.5 A current to a high-brightness light-emitting diode (HB-LED) string.
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