Design and analysis of an integrated LC3–Valley fill passive LED driver

Abstract

ABSTRACTHigh Brightness Light Emitting Diodes (HBLEDs) replace conventional lamps due to energy savings. LC3 parallel resonance principle is used to reduce the total harmonic distortion (THD) for passive LED drivers. The Valley fill concept is applied to reduce the output voltage ripple of LED driver. This paper presents the design and analysis of an integrated LC3–Valley fill passive LED driver suitable for HBLEDs. Valley fill approach is added with LC3 characteristics to further enhance the performance of the LC3-based LED driver. The proposed LED driver achieves high input power factor, low THD with reduced ripple in the output voltage. The integrated passive LED driver consists of inductors, capacitors and diodes only without using any semiconductor-based switching devices and control circuitry. A 70 W driver circuit using single-phase, 230 V, 50 Hz, ac supply is implemented to verify the theoretical analysis. Performance comparison of the integrated LC3–Valley fill passive LED driver is carried out with the existing passive LED driver topologies. An energy efficiency exceeding 95% is obtained.