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Charging Power Failure Alarm Circuit

2015-01-06 08:50  
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Charging Power Failure Alarm Circuit
The above picture is charging power failure alarm circuit.When there is AC 220V voltage,VD1, VD2 and R1, R2 generate opposite phase,VT1 stops and H lamp does not spark.When AC is cut,battery voltage is used as power supply,VT1 is added to offset voltage via VD4 and R3.At the moment,VT1 conducts,lamp H sparks,which stands by that AC power is in power failure condition.The AC is turned on,VS2 conducts and power charges the battery.if the charging is finished,C1 is charged and provides gate triggering signal for VS1 and VS1 conducts and VS2 stops at the time.If the circuit is off,VT1 conducts lamp H sends out warning signal.