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The powersaver circuit of 555 fridge

2015-01-28 03:12  
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The powersaver circuit of 555 fridge
Customers often pay attention to the reduced power consumption of the fridge while its functions are not effected. The circuit shown in Figure 13-3 is applied in all types of two-door fridges, under the condition of not changing its internal control circuits, it can cut off the defrost heating wire in the fridge and save the power.The circuit consists of step-down rectifier circuit, test switch and oscillating control circuit,etc. 555,R2,R4 and C3 form the controllable oscillator, and the oscillator is under the control of the switch tube VT1. When VT1 is conducting, the 4-pin of 555 is in a low LEV and it stops oscillating.