基于STM32的晶闸管三相调压电路的设计

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SCR三相调压触发电路已有不少设计与应用，文中提出了一种简化的基于STM32的调压触发电路设计方案，并完成了系统的软硬件设计。该设计主要采用了光电隔离并利用三相电源自身的相间换流特性，只用三组触发信号就可以达到控制六只晶闸管导通角的作用。软件部分采用了STM32芯片多个高性能定时器及周边AD接口，完成了高精度触发信号发生、PID控制调压等功能。通过实验表明该系统简便可靠，达到了设计要求。

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 funetions 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.