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我们在缆道上使用可控硅调速测深时,发现有些可控硅受高温影响时,极间漏电流急骤增大,可控硅会间歇导通使电机产生震荡,影响测深精度。我们在控制极上加一个负偏压,比较好的防止了因温升引起的误触发,也有效的防止其它干扰,保证了测深精度。其原理是:一只可控硅我们可以把它看成是PNP与NPN两只晶体管的互联如图1。若接入电路,可控硅便串联于电源与负载之中,如图2。
When we use silicon controlled speed domestication sounding on the cableway, we find that when some silicon controlled devices are affected by high temperature, the leakage current between poles increases sharply, and the thyristors will intermittently conduct to make the motor oscillate intermittently, which will affect the sounding accuracy. We add a negative bias in the control pole, better to prevent false triggers caused by temperature rise, but also effectively prevent other interference, to ensure the sounding accuracy. The principle is: a SCR we can think of it as PNP and NPN transistor interconnection in Figure 1. If access to the circuit, SCR is connected in series with the power and load, as shown in Figure 2.