Analysis and design of high-current constant-current driver for laser diode bar

Abstract

High power laser diode bar is formed from P-N junctions and powered by injected electric current. In order to drive it, it is essential to have low voltage, high and steady injected current for a power supply. So a constant-current converter with low ripple is necessary. In this paper, a two- channel interleaving buck converter with synchronous rectification and peak current mode PWM control is designed to drive the laser diode bar. The Operating Principle of the converter will be introduced. The mathematical mode of the converter in peak current mode will be analyzed and built. The prototype of the converter will also be designed and discussed in this paper.