A Single-Stage High-Power-Factor LED Driver based on Interleaved ZCDS Class-E Rectifier

A single-stage high-power-factor light-emitting diode (LED) driver with the interleaved zero-current and zero-derivative switching (ZCDS) Class-E resonant rectifier is presented. Power-factor correction (PFC) is obtained by using the output characteristics of the ZCDS Class-E resonant rectifier, which is placed between the bridge-rectifier and the direct current (DC)-link capacitor. By using a interleaved ZCDS Class- E rectifier, the peak and ripple values of the line current are also reduced, allowing for a reduced filter-inductor volume of an electromagnetic interference (EMI) filter, the conduction angle of the bridge-rectifier diode current is increased and low line harmonic distortion and power-factor near unity were naturally achieved. Moreover, low-cost standard-recovery diodes can be employed as a bridge-rectifier. A prototype LED driver, operating at a 55-kHz switching frequency and a 220-Vrms, 50-Hz line voltage, was utilized to drive a 150-W street-lighting lamp. Proposed experimental results verify theoretical analysis.