Disposable IC memory card having an embedded battery

Details Disposable IC memory card having an embedded battery Disposable IC memory card having an embedded battery

1988-12-05

1991-09-10

Gossage, Glenn

Static information storage and retrieval

Powering

Data preservation

365 52, 3072964, 3072966, 235492, G11C 514

Patent

active

050479881

ABSTRACT:
A battery circuit including an embdedded battery is incorporated in a disposable integrated circuit (IC) memory card having a memory. The battery voltage is higher than a predetermined holding voltage needed for retaining stored data in the memory. The battery circuit includes an inductor-capacitor (LC) circuit; a switching circuit for connecting and disconnecting the battery and the inductor; and a level-detection/control circuit for detecting the voltage applied to the power input terminal of the memory and alternately connecting and disconnecting the switching circuit so that the voltage across the memory is maintained at or slightly above the predetermined holding voltage. Electrical power is intermittently supplied from the battery while an excess of electrical energy supplied from the battery is temporarily accumulated in the inductor. The voltage across the memory is maintained at the predetermined holding voltage, thereby remarkably reducing the rate at which the battery energy is consumed.

REFERENCES:
patent: 3325725 (1967-06-01), Nylander
patent: 4044268 (1977-08-01), Hammel et al.
patent: 4857756 (1989-08-01), Haneda
Groves, Jr. et al., "Battery Back-Up with Defined Input Level", IBM Tech. Disc. Bull., vol. 26, No. 8, Jan. 1984, pp. 4136-4138.
"IC Memory Card Guideline", Nippon Denshi Kogyo Shinko Kyokai (pub. Sep. 1986), pp. 1-33.

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