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The small and contactless fridge time delay protector circui

2016-09-24 16:41  
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The small and contactless fridge time delay protector circuit
The small and contactless fridge time delay protector The contactless fridge has a few elements, and it's low-cost, small-size and without debugging, of which the dual-way SCR replaces the relay.Working principle The protector circuit is shown in the figure. The 220V AC current is stepped down by capacitor C1, half-rectified by VD1, regulated by VDW, and then sent to the time-based circuit 555 as the working power supply, the time of getting through is 5 min, the output terminal of 3-pin of the time-based circuit is shifted from low LEV to high LEV, the dual-way SCR VS is conducting and getting into work, which powers the fridge. At the moment, the LED is glowing, which means the power supply is normal.