可控硅感性负载交流调压设计与瞬态分析

对于双向可控硅控制大功率感性负载的交流调压装置,大功率感性负载的瞬态尖峰电压容易导致可控硅误导通,输出电压波形不对称导致无用功率增加而损坏负载的问题。通过对交流调压电路建模,分阶段分析电路特性,设计了一种过零移相触发调压电路,并改进电路结构参数,避免直接工作在大导通角状态下相位对电压的影响,大大减小瞬态突变电压干扰,消除了误导通情况。实验结果证明,此电路很好的实现了感性负载交流调压功能,控制输出精度高,电路性能稳定且抗干扰能力,证实了设计与分析的有效性。

Design and transient analysis of AC voltage regulation with TRIAC inductive load

For the AC voltage regulator with TRIAC control high-power inductive load, the transient spike voltage of the high-power inductive load leads to the TRIAC mis-conducting easily, and the asymmetry of the output voltage waveform causes the increased useless power and damage the load. By modeling the AC voltage regulation circuit and analyzing the circuit characteristics in stages, a zero-crossing phase-shifting voltage regulator circuit is designed. The circuit structure parameters are optimized, which avoids the influence of phase on voltage under direct conduction state, greatly reduces transient abrupt voltage interference, and eliminates false conduction. The experimental results show that the circuit achieves the inductive load AC voltage regulation function, high control output precision, stable circuit performance and anti-interference ability, which proves the effectiveness of design and analysis.