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555 motor phase failure overload protector circuit

2015-02-01 00:09  
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555 motor phase failure overload protector circuit
Once current can be induced into twice voltage by LZ current sensor, after rectificated and filtered, it is used as 555's voltage supply source. The DW2 steady voltage is 5.5V, it is used as the reference voltage of 555's 2 foot and 6 foot, Due to overload, LZ's twice voltage increases to 16V, when 555's 2 foot voltage is lower than 1/3 VDD, 555 is set, J0 pulls in, the contactor CJ is power failure, motor stops running, it is protected. The adjustable delay action circuit is made of RP1 and C2, on the condition of large current or long starting time when the motor works, it will avoid power failure due to the protection. When the motor operates normal, VT1 cuts off. When the motor stops running, D2 is low level, VT1 turns on, C2 is discharged, it can prevent error actions when the motor works again.