A Single-stage Bridgeless Cuk Resonant LED Driver using Silicon Carbide Power Device

In application of small and medium power LED lighting, the traditional two-stage LED driver exists in large size, two sets of control circuits and traditional Cuk PFC circuit rectifier bridge conduction loss and other issues. A single-stage LED driver without electrolytic capacitor integrated by a bridgeless Cuk PFC circuit and a DC-DC LLC circuit using silicon carbide power device is proposed, which reduces conduction loss, MOS tube ZVS, and a set of control circuits. Finally, a $200{\mathrm{\ W}}$ experimental prototype was designed on the basis of the simulation. In the input voltage range of $185 \sim 265\text{Vrms}$, the PF values of the prototype were obtained to be higher than 0.990, and the THDs were obtained to be less than 15%. at the input voltage of $185\text{Vrms}$, the PFs and THDs were obtained to be respectively 0.994 and $11.4{\mathrm{\% }}$. Under full load conditions, the prototype efficiency was obtained up to $92.39{\mathrm{\% }}$ at $205{\mathrm{\ V}}r{\mathrm{\ ms}}$ input. The effectiveness of the proposed driver is verified by simulation and experimental results.