| 摘要 |
<p>An external DC (direct current) power supply (10) is provided for supplying backup DC power to a supported device having an AC input connector. The power supply includes an AC (alternating current) voltage source. A voltage rectifier (22) is coupled to the AC voltage source for rectifying the AC voltage source. An energy storage device (32, 138) coupled in parallel to the voltage rectifier provides a predetermined DC voltage threshold level. A connector (16) of the external DC power supply (10) applies a power output of the parallel combination of the voltage rectifier (22) and the energy storage device (32, 138) to the AC input connector (18) of the supported device (20B). The external DC power supply (10) is capable of reliably, effectively and efficiently supplying backup power to the AC power input of a supported system (20B) without requiring any special wiring or modification of the supported system using only the AC input plug for connection to the supported system. <IMAGE></p> |
