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超霸SV828KR录像机设有一个220V/110V的电压转换电路(见附图),用一个6V继电器担任转换工作。继电器的常闭触点接变压器的220V绕组,常开触点接变压器的110V绕组。当电源电压为220V时,继电器不动作;电源电压为110V时,继电器吸合,市电输入变压器的110V绕组,使次级绕组输出电压保持不变。在晚上用电高峰期时,用户家中的电压下降至
Speedmaster SV828KR VTR has a 220V / 110V voltage conversion circuit (see photo), with a 6V relay as the conversion work. The normally closed contacts of the relay are connected to the 220V winding of the transformer, and the normally open contact is connected to the 110V winding of the transformer. When the power supply voltage is 220V, the relay does not operate; when the power supply voltage is 110V, the relay is engaged, and the 110V winding of the mains input transformer keeps the output voltage of the secondary winding unchanged. At peak hours during the night, the voltage in the user’s home dropped to