Design and Experimental Verification of 400-WClass LED Driver with Cooperative Control Method for Two-Parallel Connected DC/DC Converters

Tomoharu Yada,Tsuyoshi Hanamoto,Toshihiko Tanaka,Hiroaki Yamada,Masayuki Okamoto,Yuta Katamoto

doi:10.3390/en11092237

Abstract

This paper deals with a design and experimental verification of 400-W class light-emitting diode (LED) driver with cooperative control method for two-parallel connected DC/DC converters. In the cooperative control method, one DC/DC converter is selected to supply the output current for the LED, based on the reference value of the LED current. Thus, the proposed cooperative-control strategy achieves wide dimming range operation. The discontinuous current conduction mode (DCM) operation improves the total harmonic distortion (THD) value on the AC side of the LED driver. The standard of Electrical Applications and Materials Safety Act in Japan has defined the flicker frequency and minimum optical output. The smoothing capacitors are designed by considering the power flow and LED current ripple for satisfying the standard. A prototype LED driver is constructed and tested. Experimental results demonstrate that a wide dimming operation range from 1 to 100% is achieved with a THD value less than 10% on the AC side, by the proposed control strategy. The authors compare the power conversion efficiency between Si- and SiC-metal-oxide-semiconductor field-effect transistors (MOSFETs) based LED driver. The maximum power conversion efficiency by using SiC-MOSFETs based LED driver is 91.4%. Finally, the variable switching frequency method is proposed for improving the power conversion efficiency for a low LED current region.

Highlights

The 21st Conference of the Parties (COP21) of the United Nations Framework Convention on Climate Change, in December 2015, offered to set in motion an ambitious cycle of improved climate and clean energy action [1]
This paper deals with a design and experimental verification of 400-W class light-emitting diode (LED) driver with a cooperative control method for two-parallel connected DC/DC converters
Experimental results demonstrate that a wide dimming operation, from 1% to 100%, can be achieved with a total harmonic distortion (THD) value less than 10% on the AC side, by the proposed control strategy

Summary

Introduction

The 21st Conference of the Parties (COP21) of the United Nations Framework Convention on Climate Change, in December 2015, offered to set in motion an ambitious cycle of improved climate and clean energy action [1]. The energy efficiencies of the industries, buildings and transport facilities must be increased. In the field of lighting fixtures, light-emitting diodes (LEDs) are widely used to reduce energy consumption. Since the adoption of the Minamata Convention on Mercury in October 2013 [2], LED floodlights have been superseding the mercury lamps. LEDs offer many advantages such as high luminance efficiency, long operating life and high-speed response for many applications [3]. Two-stage topology is the most popular topology for LED drivers above 100 W because

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Conclusion