Based Simulation Of The Dsp Ac Constant Current Source

With the rapid development of power electronics and the increasing requirement for the performance of equipment control system in every walk of life, the demands to electric pwer are increasing and its position at electronic equipment is becoming more and more important. Consequently, the further research to electric power has much meaning and practicality value.The SPWM algorithm used in present inverse modulation was discussed in our study, and the algorithm was simulated by Simulink kit in Matlab. This paper presents the Implementation of AC Constant Current Source based on DSP. Using the algorithm of modulation, a numeration of sine function, realtime sampling cycle, voltage amplitude generate realtime SPWM waves, then accessing Intelligent Power Module (IPM) after amplifying the PWM wave to sample current signal with fiber optic current sensor, and importing the AD module to regulate in order to provide the control for output current and intelligent control system of constant current. The solution's structure was simple and the basic function interfaces are complete, easy to extend. This scheme reflects the high-frequency, digitalization, modularized of inverter power source. The designed power supply was applied to the protection relay test system.