Soft-Switching and Four-Channel Current-Balancing LED Driver with Wide Input Voltage Range
In order to cope with LED applications of different input voltage levels,a four-channel LED driver with a wide range of input voltage is proposed.The driver integrates a Buck-Boost structure into a full-bridge network,and operates in different modes through dif-ferent combinations of switches,resulting in a wide gain.The passive current balancing method is used to achieve 4 LED outputs to share the current.Due to the operating characteristics of the driver,the switches can realize the ZVS(zero-voltage-switch)under the full range without the addition of a lossless snubber circuit.The modulation strategy,operation and performance of the driver are analyzed in detail.Finally,a 69 W experimental prototype is built,and the experimental results show that the input voltage range of the driver is 17 V-216 V,the current sharing error is less than 3.7%,and the maximum efficiency is up to 97.8%.
LED driverwide input voltage rangesoft switchingcurrent balancing
国家科技期刊平台
NSTL
万方数据
