IC card with improved power supply switching circuitry

Details IC card with improved power supply switching circuitry IC card with improved power supply switching circuitry

1990-11-29

1992-08-11

Trafton, David

Registers

Records

Conductive

307 25, 307 30, 307 66, G06K 1906

Patent

active

051381427

ABSTRACT:
An IC card has its internal load divided into a plurality of load circuits through which substantially equal currents flow. A power supply switching circuit is provided for each of the load circuits. The switching circuits switch the power supply for the IC card between an internal power supply and an external power supply to avoid excessive voltage losses when the current for the internal load flows through a single switching circuit.

REFERENCES:
patent: 3949238 (1976-04-01), Brookes
patent: 4001550 (1977-01-01), Schatz
patent: 4658151 (1987-04-01), Wyser et al.
patent: 4659942 (1987-04-01), Volp
patent: 4670661 (1987-06-01), Ishikawa
patent: 4810864 (1989-03-01), Takahashi
patent: 5047988 (1991-09-01), Mizuta
Muller et al., "Lithium-Power-Module: Speicherinhalte am Leben erhalten", Elektronik, vol. 35, No. 9, May 1986, pp. 66-72, translation supplied.

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