Static information storage and retrieval – Powering – Data preservation
Patent
1996-04-29
1997-11-11
Nelms, David C.
Static information storage and retrieval
Powering
Data preservation
365228, G11C 11412
Patent
active
056871295
ABSTRACT:
A circuit for supplying power to an IC memory card by using primary and secondary batteries as a data preserving power means for the memory IC according to the present invention, includes: primary and secondary batteries; a secondary battery charging circuit for charging the secondary battery; and a primary and secondary battery backup circuit for connecting the primary and secondary batteries to the memory IC when an external power source is disconnected; a serial-parallel switching means for connecting the primary and secondary batteries in series or in parallel; a voltage detecting means for comparing a power voltage of the memory IC with a reference voltage to generate a voltage detection signal upon finding the power voltage dropped to below the reference voltage; and a switching control means for receiving the voltage detection signal of the voltage detecting means to control the serial-parallel switching means so as to connect the primary and secondary batteries in series or in parallel.
REFERENCES:
patent: 5047988 (1991-09-01), Mizuta et al.
patent: 5058075 (1991-10-01), Mizuta et al.
patent: 5212664 (1993-05-01), Shinohara
patent: 5384748 (1995-01-01), Sanemitsu
Le Vu A.
LG Semicon Co. Ltd.
Nelms David C.
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