Design of a new-style and high-stability LD drive power supply

This paper describes the design of a new-style and high-stability semiconductor laser diode(LD) linear drive power supply, which is able to drive 100 mW to 1.8 W laser diodes and the output current can be continuously adjustable from 0 A to 2.5 A. The current stability obtained in the LD driver circuit is superior to 0.3⁰/₀₀. In the design we have innovative ideas of the soft-start circuit, the current-limiting circuit with special rated-current setting function, the surge ripple prevention and filter circuit,especially enhance the stability and security of the power drive system. Such design will be found wide applications in the fields of teaching, scientific research and production.