Four-Channel Buck-Type LED Driver with Automatic Current Sharing and Soft Switching

A buck-type LED driver together with automatic current sharing and high step-down voltage conversion ratio but without complex control is proposed. The proposed can not only achieve zero switching (ZVS) turn-on by adding one resonant coupled inductor, which resonates parasitic capacitors of active switches, also obtain lower gain better efficiency. In this paper, the operating principles design considerations converter are discussed in detail. addition, number strings be extended to more than four channels. Finally, theoretical analysis performance verified simulations experiments using a field-programmable logic gate array (FPGA) named EP3C5E144C8N as circuit kernel.