Power source device for bubble memory unit

Details Power source device for bubble memory unit Power source device for bubble memory unit

1980-07-17

1982-04-27

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

365229, G11C 1908, H04B 1700

Patent

active

043274226

ABSTRACT:
A power source device for a bubble memory unit, wherein there is supplied a first DC voltage E.sub.c which is applied to control circuitry for controlling the reading and writing of data, a second DC voltage signal E.sub.d which is applied to drive circuitry for driving a bubble memory element, and a memory signal M.sub.e which enables data to be written in or read from the bubble memory element, the signals E.sub.c, E.sub.d and M.sub.e being made to rise and fall according to a prescribed sequence as a commercial power supply is connected and disconnected. The power source device includes first and second DC power source circuits, a comparator circuit for comparing the magnitude of the first DC voltage E.sub.c with a reference level V.sub.M having a value greater than an allowable lower limit value, and a delay circuit. The second DC power source circuit is actuated following a prescribed time delay which begins when the value of signal E.sub.c surpasses the reference level V.sub.M at the time that the commercial power supply is connected, and the memory enable signal M.sub.e is produced after the second DC power source circuit has been actuated. The memory enable signal M.sub.e is made to vanish when the magnitude of signal E.sub.c drops below the reference potential V.sub.m at the time that the commercial power supply is disconnected, the second DC power source circuit being rendered non-operational following a prescribed time delay.

REFERENCES:
patent: 3980935 (1976-09-01), Worst
IBM Technical Disclosure Bulletin-vol. 18, No. 12, May 1976, pp. 4147-4149.

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