Final accommodation device for power-source drop

Details Final accommodation device for power-source drop Final accommodation device for power-source drop

1998-06-12

2000-12-12

Hajec, Donald

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Systems controlled by data bearing records

Credit or identification card systems

235384, G06K 500

Patent

active

061586560

ABSTRACT:
A method and apparatus for enabling a processor to execute processing routine even if a power-source voltage drop occurs during processing. When an ignition key switch 102 is closed, voltage VB is supplied from a vehicle-mounted battery B1 to a comparator AMP of a CPU 108 and to a power-source stabilizer circuit 201 of a regulator 200. Also, capacitors C1 and C2 are charged with a load from the vehicle-mounted battery B1. Even if the power-source line is momentarily interrupted while in this state, the capacitor C1 has already been charged, and so the transition of the drop in voltage VB is gradual compared with a case wherein the capacitor C1 is absent. Additionally, because the capacitor C2 has already been charged, voltage VCC supplied to the CPU 108 from the regulator 200 is held at a fixed value for a certain interval. Because of this, the drop in voltage VCC is delayed and the power source is switched from the vehicle-mounted battery B1 to a battery B2, thereby allowing the CPU 108 to continue to perform uninterrupted data processing.

REFERENCES:
patent: 4307455 (1981-12-01), Juhasz et al.
patent: 5105074 (1992-04-01), Nara
patent: 5310999 (1994-05-01), Claus et al.
patent: 5351187 (1994-09-01), Hassett
patent: 5519871 (1996-05-01), Shimoda
patent: 5557738 (1996-09-01), Townsley et al.
patent: 5933812 (1999-08-01), Meyer et al.
Paul Horowitz and Winfield Hill, "The Art of Electronics" Cambridge University Press, 1980, p. 199.

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