Power Supply Failure Detector

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.

Power supply failure detector.

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. Working of power supply failure alarm. But the alarm circuit presented here needs no additional supply source. The front end of the design is a simple ac230v mains presence sensor built around one popular photocoupler pc817b oc1.

Then to check the system turn off the power supply and you will see buzzer start beeping as soon as you turn off the power. The present invention is characterized by being provided with. Will alarm for 72 hours straight with the supplied lithium battery. A selectable snooze alarm feature will cause the alarm to come back every 30 minutes until power is restored.

Most of the power supply failure alarm circuits need a separate power supply for themselves. 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. 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. A reference voltage storage unit 29 which in the off state of a power supply switch.

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.