黑白电视机在许多家庭早已弃置不用或报废,但里面的电源变压器通常是好的,可以再利用。利用黑白电视机电源变压器,笔者设计并制作了电冰箱保护器或简易全自动调压器。 一、电路特点 采用桥式整流的黑白电视机电源变压器的次级通常是单绕组(18伏左右),对应的电冰箱保护器或简易全自动调压器的电路原理如图1所示。 采用全波整流的黑白电视电源变压器的次级通常是双绕组(一般为双18伏),对应的电冰箱保护器或简易全自动调压器的电路原理如图2所示。 图1和图2大同小异,相同点如下: Black and white TVs have long been abandoned or scrapped in many homes, but the power transformers inside are usually good and can be reused. Use of black and white TV power transformer, the author designed and produced a refrigerator protector or simple automatic regulator. First, the circuit characteristics of the bridge rectifier black and white TV power transformer secondary usually single winding (18 V or so), the corresponding refrigerator protector or simple automatic voltage regulator circuit shown in Figure 1. Full-wave rectified black and white TV power transformer secondary usually double winding (usually double 18 volts), the corresponding refrigerator protector or simple automatic voltage regulator circuit shown in Figure 2. Figure 1 and Figure 2 are similar, the same as follows: