A direct current power supply device which generates an alarm signal when a power failure occurs in an alternating current power supply connected as an input to the device. A power failure detector circuit is connected at the input of the device and signals the failure of the AC power supply. In order...http://www.google.es/patents/US5105182?utm_source=gb-gplus-sharePatente US5105182 - Direct current power supply device having an alarm provided for power failure under varying load conditions
Direct current power supply device having an alarm provided for power ...
