An Integrated Electronic Lighting Driver Circuit for Powering a Deep Ultraviolet LED Sterilization and Germicidal Lamp

Deep ultraviolet light-emitting diode (LED) sterilization and germicidal lamps with short-wave characteristics, can be used to replace the traditional ultraviolet mercury lamps, is a new type of light source can be applied to air purification and surface disinfection, as well as household disinfection and sterilization. This paper develops a novel electronic lighting driver circuit, which integrates a Zeta converter with a half-bridge LLC resonant converter, for powering a deep ultraviolet LED sterilization and germicidal lamp. The coupled inductor inside the Zeta converter sub-circuit is designed to operate in the discontinuous conduction mode, which naturally achieves the effect of power factor correction. In addition, two power switches have zero-voltage switching (ZVS) characteristics and two output diodes have zero-current switching (ZCS) characteristics in the proposed driver circuit. Therefore, the proposed circuit with soft-switching capability is suitable for deep ultraviolet LED sterilization and germicidal lamp driving at higher power levels. In this paper, a 48W (24V/2A) deep ultraviolet LED electronic lighting prototype driver circuit for a sterilization and germicidal lamp has been developed. The results of the prototype circuit show that, at an AC input voltage of 110 volts RMS, the proposed electronic lighting prototype driver circuit has high efficiency (>90%), high power factor (>0.9), and low total harmonic distortion factor (THD<4%).