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555 motor integrated protection warning device circuit

2015-02-03 23:17  
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555 motor integrated protection warning device circuit
As shown in the figure 10-12, this device is made as the core of 555. It fully uses the characteristic of time base circuit's trigger set, reset and control, such as the characteristic of 555's 4 foot's reset preferentially, it is used as the input terminal of check of leak current; when it comes overload, phase failure, short trouble, it adopts 6 foot's high impedance threshold characteristic as the overcurrent protection reset terminal; it uses 5 foot's control characteristic as overcurrent protection regulation; it uses 2 foot's high impedance terigger characteristic and 7 foot's discharge characteristic as the terigger control which is needed by delay automatical recovery; it adopts 555's high driving force(can reach 200mA) to drive SCR directly. Using a 555 circuit can achieve integrated protection control.