Study on new control strategy for reducing impact current of three-phase rectification circuit

Taking into account the shortcomings of traditional three-phase full-wave rectifier method, a new method which achieves the trigger control of the three-phase Silicon Controlled Rectifier (SCR) half-controlled bridge by means of the PIC Single Chip Microcomputer (SCM) is presented. In this method, SCM is used to detect zero-crossing point of the voltage and control the one-phase SCR delay trigger. The structure and operating principle of the hardware are introduced and the simulation results are given. The structure of the software for the control strategy is also introduced. The experimental result is given. The simulation and experiment show that the purpose to reduce the impact current of the three-phase rectification circuit is realized. The method has simple hardware structure, simple software structure and small size. It also can be extended to other high power rectifier filter circuits.