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用555集成电路制作的多功能保护电路如图所示。IC1⑥脚为高电平,当检测电压Vi上升时,只要IC1②脚的电平略大于1/3VCC,③脚便输出低电平,IC2的④脚强制复位,IC2不振荡,双向可控硅不导通,完成过电压保护。当检测电压Vi下降时,④脚的电位下降到低电平(实测为0.59V以下),③脚便输出低电平,IC2停振,双向可控硅截止,实现欠电压保护。IC2为占空比可调的方波信号发生器。调节电位器W3,可使C1的充放电可调。SCR选用耐压为400V的产品,其额定电流容量根据实际需要而定。用555时基电路制作保护器有以下特点:(1)在制作电源时(为了减少体积,采用电容降压方法),可在5～18V之间选择,给业余制作带来很大的方便。(2)驱动负载能力强。(3)
The 555 integrated circuit with multi-function protection circuit shown. IC1 ⑥ pin is high, when the detection voltage Vi rises, as long as the level of IC1 ② pin is slightly larger than 1 / 3VCC, ③ pin output low, IC2 pin forced reset, IC2 is not oscillating, triac not Conduction, over-voltage protection. When the detection voltage Vi decreases, the voltage at pin 4 drops to a low level (measured as 0.59V or less), pin 3 outputs a low level, and IC2 stops oscillating and the triac turns off, undervoltage protection is achieved. IC2 is a square wave signal generator with adjustable duty cycle. Adjustment potentiometer W3, C1 can charge and discharge adjustable. SCR selection pressure 400V products, the rated current capacity according to actual needs. With 555 time base circuit protection device has the following characteristics: (1) in the production of power (in order to reduce the volume, the use of capacitor buck method), can choose between 5 ~ 18V, to amateur great convenience. (2) strong ability to drive the load. (3)