Patent ID: 7164214

Claim:
An uninterruptible power supply circuit for selectively connecting a direct current source to equipment which is to be operated by the direct current source, comprising: a first switch for selectively connecting the direct current source to first equipment having operative components which can be electrically disconnected without a loss of function; a second switch for selectively connecting the direct current source to second equipment having operative components which can exhibit a loss of function when electrically disconnected; a battery, separate from the direct current source and electrically coupled with the second equipment, wherein the battery provides direct current for operating the second equipment when the second equipment is disconnected from the direct current source; and a processor electrically coupled with the first switch and with the second switch, wherein the processor activates and deactivates the first switch and the second switch to selectively connect the direct current source with the first equipment and with the second equipment and to disconnect the direct current source from the first equipment and from the second equipment after a prescribed period of time has been counted, so that the second equipment remains connected to the battery after the second equipment has been disconnected from the direct current source.