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在农村或少数城镇,普遍存在交流供电电压不稳和偏低现象,使家用电器不能正常工作。本文介绍一种给黑白电视机加装的自动调压切换电路,能在输入交流电压降低至110V时,电视机还能正常工作。该自动调压切换电路的原理及改接示意见图1所示。在交流输入电压正常时,电路上A、B两点的直流电压高于12.6V。DW_1的击穿电压为12V,故击穿导通,V_1亦导通,V_2截止,无电流通过继电器K,故不吸
In rural areas or in a few cities and towns, there is a widespread phenomenon that the AC power supply voltage is unstable and low so that the household appliances can not work normally. This article describes a black and white TV installed automatic voltage regulation switching circuit, the input AC voltage can be reduced to 110V, the TV can work properly. The principle of the automatic voltage regulator switching circuit and the modified connection shown in Figure 1. When the AC input voltage is normal, the DC voltage of A and B at the circuit is higher than 12.6V. DW_1 breakdown voltage is 12V, so breakdown conduction, V_1 also conduction, V_2 deadline, no current through the relay K, it is not suction