The protector circuit is shown in the figure. The 220V AC power supply is stepped down by the capacitor C1. The VD1 half-wave rectification and VDW voltage regulation are supplied to the time base circuit 555 as the working power supply. The power is turned on for about 5 minutes, and the 3-pin output terminal of the time base circuit changes from the low level to the high level. Flat, two-way thyristor VS conduction work, powering the refrigerator. At this time, the LED is lit, indicating that the power supply is normal.
The circuit is easy to install due to the use of fewer components, and as long as the connection is correct, it generally works without debugging.
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