18V Monitoring circuit diagram

Published:2011/3/24 20:10:00 Author:Ecco | Keyword: Monitoring circuit | From:SeekIC

When ±18 V battery is discharged but cut to reserved low voltage, the Zener diode will be out of control, Q1's becoming is being positive-skew state, and the light-emitted diode needs to replace battery or refresh to them at this time. When the voltage of battery is normal, the Zener diode is placed in back bias state, the Q1 closes, and the light-emitted diode doesn't work and only consumes the current less than 1 mA.



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