Single-Stage PFC Charge-Pump Bridgeless Converters for LED Driver Applications
Zito Palhano da Fonseca, Claudinor B. Nascimento, Alceu André Badin
Abstract
This article presents the analysis and design of a single-stage charge-pump (CP) bridgeless converter for light-emitting diode (LED) applications. The proposed topology is based on a boost bridgeless converter operating in a discontinuous conduction mode, which is associated with the CP concept. The proposed electronic lighting system employs a reduced component count, and the CP concept is used to reduce the LED current ripple. A high power factor is demonstrated to be an inherent property of the proposed topology, and no input current control is necessary. The operating principle of the proposed converter, which includes two operating modes in a steady state, is presented and analyzed. We also present a prototype operating with a switching frequency of 75 kHz, an input voltage range of 90–160 V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RMS</sub> , and an output power of 60 W with a power factor of 0.989, the total harmonic distortion of 14.15%, and the efficiency of up to 95.4%. Additionally, all individual harmonic magnitudes of the input current meet the IEC 61000-3-2 class-C standard limits.