对双向可控硅进行移相触发,可用专用的集成电路芯片,但此类芯片不易购得。用常见分立元件及通用运放也可组装成性能极好的移相触发电路。本文介绍的正是这样一种触发电路,它经长期使用,证明其稳定可靠,性能可与专用触发电路相媲美。 工作原理 这一触发电路如图1所示。电路中R1～R4,A1构成过零脉冲生成电路,过零脉冲的宽度取决于R3与R4的阻值比及R1与R2的阻值比。A1的反相输入端输入波形是全波整 Bidirectional thyristor phase shift trigger can be used a dedicated integrated circuit chip, but such chips are not easy to buy. With common discrete components and common operational amplifier can also be assembled into excellent performance phase-shift trigger circuit. This article describes is such a trigger circuit, which after long-term use, to prove its stability, performance and special trigger circuit comparable. The working principle of this trigger circuit shown in Figure 1. Circuit R1 ~ R4, A1 constitute a zero-crossing pulse generating circuit, the width of the zero-crossing pulse depends on the resistance ratio of R3 and R4 and R1 and R2 resistance ratio. The inverting input of A1 is full-wave