A constant-current power supply inverter applied to a test system for the magnetic performance of the core

Aiming at testing the magnetic performance of the core,a digital signal processor(DSP)-based constant-current power supply in-verter was designed.First,normal methods and common features were analyzed to control buck converter and power supply inverter.The bus voltage of the system was reduced by synchronous Buck converter,whose output voltage was kept constant by PI controller when the load changed suddenly.Then the induction current of the power supply inverter was controlled by PID controller,whose output was modulated by unipolar sine pulse width modulation(SPWM).The experiment results show that the system has good static,dynamic performance and stabil-ity,which satisfies the design requirement.