Power Supply Failure Detector

The only power failure device with plug detection.

Power supply failure detector.

The present invention is characterized by being provided with. Most of the power supply failure alarm circuits need a separate power supply for themselves. Working of power supply failure alarm. 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.

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. 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 front end of the design is a simple ac230v mains presence sensor built around one popular photocoupler pc817b oc1. After soldering the components as per circuit diagram connect the power supply and turn it on.

Will alarm for 72 hours straight with the supplied lithium battery. 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. But the alarm circuit presented here needs no additional supply source. If your plug becomes unplugged from the power fail alarm itself this is detected electrically and the alarm sounds.

A reference voltage storage unit 29 which in the off state of a power supply switch.