555 simple refrigerator protection circuit

Published:2011/8/2 1:16:00 Author:Ecco | Keyword: 555, simple , refrigerator, protection | From:SeekIC

The circuit is shown in Figure 13-5, the protection is mainly used for power delay protection to avoid the compressor from frequent start, and mechanical damage from the non-equilibrium state. When it stops, the voltage on C1 discharges through D1 immediately. When it gets power again, because the voltage on C1 is not mutation, 555 is in the reseting state; until C1 is charged to td = 1.1R1C1, which is about 6 minutes, 2 foot level is below the 1/3 VDD, 555 is set, the SCR then is connected, refrigerator is running.



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