Design of SCR three-phase AC-voltage regulator based on STM32 MCU

This paper introduces a novel design of three-phase AC-voltage regulation trigger circuitry using silicon controlled rectifier(SCR),and presents its application in an energy-saving design of oil extractor control system.The design employs photoelectric isolation technique and the inter-phase of three-phase power supply itself,only three groups of triggering signals are required to control the six thyristors' conducting angles.The generation of high-precision triggering signals and PID control regulator functions are realized by programming the multiple high-performance timers and the AD interface of a STM32 microprocessor.Experiments and in-field tests have shown the feasibility of the proposed scheme.