DEVICE AND METHOD FOR EARLY DETECTION OF POWER FAILURE IN AN EXTERNAL POWER SUPPLY

摘要

An external power supply converts AC power to DC Power for a device. The external power supply and the device comprise circuits that provide early AC input failure detection so that the device can take measures such as to safe keep data as long as the external power supply continues to provide DC power to the device.

主权项

1. A method of electric power failure detection for transmission to an electronic device wherein said method is implemented by an external power supply, the electronic device being configured to receive Direct Current power from said external power supply external power supply comprising an Alternating Current input for connection to a mains electricity network and said external power supply comprising a Direct Current output for connection to said electronic device via Direct Current power conducting leads, the method comprising:
detecting absence of supply of mains power on said Alternating Current input of said external power supply; transmitting, to said electronic device, information representative of said absence of supply of mains power on said Alternating Current input when said absence of supply of mains power on said Alternating Current input of said external power supply is detected.