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在此提出一个新型的用于三相可控整流桥的通用微机控制电路,由此控制器展现的操作性能要优于先前的电路。在快速响应及恒开环增益的条件下其触发角在0到180°的范围内得到平滑的控制,甚至在变流器由小功率频率未调交流系统供电情况下亦然。通过一个高效的控制软件PLL(锁相环路)得以实现线路与VCO(电压控制振荡器)的同步。电源阻抗引起的对同步信号的延迟影响由该控制电路完整地补偿,补偿线路的实施亦在此文表明。以8086微型计算机力基础建立的控制线路硬件和软件的实施在此进行讨论,并且提供了试验结果。
Here, a new type of general microcomputer control circuit for three-phase thyristor controlled rectifier bridge is proposed, whereby the controller exhibits superior operating performance over the previous circuit. With fast response and constant open-loop gain, the firing angle is smoothly controlled from 0 to 180 °, even when the converter is powered by a low-power, frequency-insensitive AC system. Synchronization of the line with the VCO (Voltage Controlled Oscillator) can be achieved with an efficient control software PLL (Phase Locked Loop). The delay effect on the synchronization signal caused by the power supply impedance is completely compensated by the control circuit, and the implementation of the compensation circuit is also indicated herein. The implementation of control line hardware and software based on the 8086 microcomputer force basis is discussed here and the results of the experiments are provided.