Power source device for bubble memory unit

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

1981-07-10

1984-05-29

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

363 21, G11C 1908, H02M 3335

Patent

active

044519028

ABSTRACT:
In a power source device for a bubble memory unit consisting of a bubble memory part and a control part, a controlling supply voltage to be applied to both the bubble memory part and the control part is produced by a power source circuit based on a pulse width modulation system. The power source circuit is provided with a circuit which can expand the signal pulse width in excess of its upper-limit value during the ordinary voltage control. When the controlling supply voltage has become lower than a predetermined value, the pulse width is expanded so that the refresh operation may be perfectly executed when the power source device for the bubble memory unit is turned off.

REFERENCES:
patent: 3873846 (1975-03-01), Morio et al.
patent: 4172277 (1979-10-01), Pinson
patent: 4236196 (1980-11-01), Koizumi et al.
patent: 4253136 (1981-02-01), Nanko
patent: 4327422 (1982-04-01), Imazeki et al.
patent: 4330816 (1982-05-01), Imazeki et al.

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