基于单片机脉冲触发器电路设计

Circuit design of pulse trigger based on microcomputer

由于工程上应用交流电子开关柜控制交流电动机其主电路采用晶闸管模块,单片机产生六个脉冲其相位依次相差60°,而晶闸管必须成对脉冲才能够导通构成回路,为此要进行脉冲的补充。设计了一款基于单片机的脉冲触发器。该触发器利用PSD4000系列芯片的逻辑功能来进行脉冲的补充,通过调制电路对脉冲进行调制。该脉冲触发器系统运行稳定且成本低廉。

For engineering applications for AC electronic switchgear control AC motors main circuit thyristor SCR module,microcomputer produce six pulses per pulse phase difference of 60° turn,the thyristor must be paired pulses to be able to conduction constitute a loop for to do this must supplement pulses. This paper presents the design of a trigger pulse based on MCU. The use of flip- flop logic function PSD4000 chips carry out the pulse supplemented and modulation circuit to modulating the pulses. The system of designed pulse triggers is stable,low cost.