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《电子制作》97年第11期上的《用单向可控硅代替双向可控一法》文章后,觉得文中把两只单向可控硅的控制极G连接在一起代替双向可控硅的G使用是不妥的。因为交流电压过零后略为升高就能使其中的一只可控硅的阴极与控制极间的反向漏电流增大到足以触发另一只可控硅导通,于是两只可控硅不断地轮流导通而不能关断,使电路夫去开关控制作用。正确的接法应如图1。当K闭合,则VS1、VS2轮流导通;K关断,则 VS1、VS2因无触发电流I_G而自然关断。此电路很
“Electronic Production” 97, No. 11 on the “one-way SCR instead of two-way control of a law,” the article, I feel the text of the two unidirectional thyristor G connected together instead of two-way thyristor The use of G is not proper. Because the ac voltage zero after a slight increase can make one of the SCR and cathode reverse leakage current between the control electrode is increased enough to trigger another thyristor conduction, so two SCR Continuously turn on and off can not turn off, so that the circuit husband to the switch control. The correct connection should be as shown in Figure 1. When K is closed, VS1 and VS2 are turned on in turns; when K is off, VS1 and VS2 naturally turn off due to non-triggering current I_G. This circuit is very