Power Supply Failure Detector

It employs an electrolytic capacitor to store adequate charge to feed power to the alarm circuit which sounds an alarm for a reasonable duration when the mains supply fails.

Power supply failure detector.

The front end of the design is a simple ac230v mains presence sensor built around one popular photocoupler pc817b oc1. Will alarm for 72 hours straight with the supplied lithium battery. A reference voltage storage unit 29 which in the off state of a power supply switch. Working of power supply failure alarm.

It is very helpful to indicate the loss of power supply to some power critical instruments such as a lifecare device installed in a hospital. The only power failure device with plug detection. A selectable snooze alarm feature will cause the alarm to come back every 30 minutes until power is restored. Provided are a power failure detection method a power failure detector a lighting device and a power supply device which enable power failure detection regardless of the state of a power supply switch without requiring interior wiring work.

If your plug becomes unplugged from the power fail alarm itself this is detected electrically and the alarm sounds. After soldering the components as per circuit diagram connect the power supply and turn it on. But the alarm circuit presented here needs no additional supply source. This minuscule power failure alarm circuit is a power supply monitoring device that will set off a piezo speaker when the ac mains mains supply cuts off.

The circuit also includes a standard on rechargeable 6f22 9 v battery bat in power supply and a low voltage slide switch s1 as the master power on off switch.