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The power failure protection circuit of 555

2016-09-18 00:44  
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The power failure protection circuit of 555
It's a taboo for fridge to get power in intermittence, especially off and on in short times. To avoid the compressor is on and off repeatedly and to protect it from damage, it is proper to use this circuit to protect it temporarily. This circuit consists of step-down rectifier circuits, 555 relaying circuit and controllable trigger circuits, see as Figure 13-22. AC step-down rectifier circuit consists of C1,R1,bridge rectifier D1~D4 and C2, the rectified current becomes a CD voltage of VDD=10V after being stabilized by R2 and DW, then it becomes a continuing working voltage.