Back-up electrical systems
First Claim
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1. A back-up power system powerable from a primary energy source, comprisingmeans for energizing, at a first frequency, an electrical device from said primary energy source;
- means for sensing any interruption of power from said primary energy source; and
means for energizing, at a second frequency different from said first frequency, said device, immediately following said interruption, from an alternative energy source after conversion to an alternative energy state.
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Abstract
A back-up power system which can accommodate a standard electrical device that is operable from an alternating current power source when alternating current is available, but is operable by a direct-current to direct-current converter when alternating current is unavailable, the converter being powered by replaceable low voltage battery charged by the alternating current source, with the loss of alternating current being sensed to cause the disconnection of the alternating current source and connection to the low-voltage replaceable battery.
97 Citations
20 Claims
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1. A back-up power system powerable from a primary energy source, comprising
means for energizing, at a first frequency, an electrical device from said primary energy source; -
means for sensing any interruption of power from said primary energy source; and means for energizing, at a second frequency different from said first frequency, said device, immediately following said interruption, from an alternative energy source after conversion to an alternative energy state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Apparatus comprising
a conductive path having one end connectable to a primary energy source and an opposite end connected to a secondary energy source; - and
a switch having open and closed positions inserted into said path, said switch being shunted by an impedance element; whereby connection of said path to said primary source, with said switch open permits energy to flow to said secondary source.
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20. The method of providing a back-up power system, comprising the steps of:
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(a) connecting a device to a primary energy source; (b) sensing any interruption of power from said source; and (c) immediately energizing said device from an alternative direct current energy source after conversion to an alternative direct current state when said interruption of power from said primary energy source is sensed and maintaining said alternative energy input during said interruption of power.
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Specification