Research On High-precision & High-stability Current Source

The difference between high-stability power supply and ordinary power supply is its high stability what is better than 100PPM. Some parameters about high-stability power supply are introduced. All kinds of factors are stated systematically which affect the stability of power supply by way of Transmission-function.Soft-Switching technique is a hotspot of power electronic research. It's the key technique in the high frequency and high-density converter. This paper proposes a phase-shift ZVZCS full bridge converter and analyses it's principle of operation. On the analyses of several typical circuit topologies, a ZVZCS full bridge PWM converter using a saturable inductor is introduced. This paper presents the method of component parameter design. The combining scheme of analog and digital control technology has many advantages in improving the high-precision, anti-interference ability and flexibility, general and intelligent level. The combination of soft-Switching technique and digital control scheme is a trend of modern high-precision & high-stability power supply.The advances of this paper lay on:(1) A High-precision & High-stability Current Source using phase-shift control ZVZCS full bridge PWM method is designed.(2) With the network control system, the converter can be debugged, controlled and monitored easily.The experiment results show: The control system's hardware structure is simple, highly integrated and easy to implement; The control system's software works properly and fulfill all functions; Main circuit's parameter is right, reasonable and achieve all design require; The Current Source can implement zero voltage and zero current soft switching in a large load range and has a high efficiency. The system has high enough precision and high enough stability.