Abstract:

In order to provide electrical equipment with high stability, high reliability and constant current, this article has designed a constant current source for high power semiconductor laser system. the design used a low-sensitivity power amplifier tubes with a redundant parallel to improve reliability of the system, used high precision reference voltage source and current series negative feedback based on adder sampling to inerease the system stability. The power tube loss was analyzed Power triode 2N3055 was used and through wind tunnel type integration radiator to carry on the uniform temperature gradient radiation to the power triode, thus realized the constant current system power loss to be balanced. The experimental result indicated that the system can ensure higher reliability and lower than 0.982‰ (output current 50 A ) stability, at the same time, output 0~50 A continuously adjustable high-current, output power up to 350 W, and achieve a successful power loss balanced.

Key words: constant current source, power transistor, adder sampling, radiator