Method and apparatus for preventing loss of data from volatile m

Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source

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H02J 900

Patent

active

043814573

ABSTRACT:
Normal line voltage, such as 115 volts AC available on a standard home or office receptacle (or single or three phase 230 volts AC), is surge protected and filtered prior to monitoring for voltage deviations outside of a voltage "window" such as 105-125 volts AC. Deviations outside of this voltage "window", are sensed and a deviation output signal is generated. The filtered AC supply and an auxiliary AC supply are selectively connected to the user equipment through a power distribution panel, with the selection being determined by the deviation output signal. By the method and apparatus of the invention, the computer equipment is supplied with primary input power from the utility company or the like as long as the voltage remains within this adjustable voltage window of 105-125 volts AC. If the line voltage moves outside of this "window", due to drift, brown-out, drop-out (complete voltage failure), or a surge creating an overvoltage condition, there is a transference of the power supplied to the computer equipment from the normal AC supply to an auxillary AC supply to maintain the contents of RAM and allow the program to continue running. Visual and audible indicators are actuated upon the occurrence of the deviation output signal to notify the user of the equipment that primary power has been disconnected and data should be transferred from volatile memory to non-volatile memory to prevent data loss. If the failure is temporary, the device automatically recovers and switches back to primary AC power when the filtered line voltage is within its "window".

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patent: 4315162 (1982-02-01), Ferguson

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