A novel single-stage LED driver for energy-saving streetlight applications with interleaved power-factorcorrection

ABSTRACT

This paper proposes a novel single-stage light-emitting diode (LED) driver with interleaved power-factor corrections (PFC) suitable for energy-saving streetlight applications. The presented circuit combines an interleaved boost PFC converter with a half-bridge-type series-resonant converter cascaded with a full-bridge rectifier into a single-stage power-conversion topology. Two inductors in the interleaved boost PFC converter sub-circuit are designed to operate in discontinuous-conduction mode (DCM) in order to achieve input-current shaping, and the half-bridge-type series-resonant converter cascaded with a full-bridge rectifier is designed to obtain zero-voltage switching (ZVS) on two power switches to reduce their switching losses. The proposed driver features high power factor, low total-harmonic distortion (THD) of input current, and high circuit efficiency, all of which results in energy savings. A prototype driver is developed and implemented to supply a 165W-rated LED streetlight module with utility-line input voltages ranging from 210 V to 230 V. In addition, satisfactory experimental results have demonstrated the feasibility of the proposed LED driver.

KEYWORDS:

• Converters
• driver
• light-emitting diode
• streetlight

Additional information

Funding

The authors would like to convey their appreciation for grant support from the Ministry of Science and Technology (MOST) of Taiwan, R. O. C., under its grant with reference numbers MOST 105-2221-E-214-028 and MOST 106-2221-E-214-030.