Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1983-04-04
1984-10-30
Pitts, Harold I.
Registers
Systems controlled by data bearing records
Credit or identification card systems
235487, 363 82, G06K 500
Patent
active
044801785
ABSTRACT:
A circuit for maximizing power transfer from a station to an interactive memory card via a capacitive interface. A reader system in the station generates an ac signal which provides operating power that is transferred to the card through the capacitive interface formed when the card is placed against a window on the station. The ac signal from the station is directed through a series resonant circuit to the card. The capacitive interface between the station and card make up the capacitive element of the resonance circuit while the series combination of the secondary of a transformer and an electrically variable inductor form the inductive element. Use of the variable inductor allows the station to tune the circuit to resonance and cancel the capacitive element, thereby maintaining maximum power transfer to the card.
REFERENCES:
patent: 2302893 (1942-11-01), Roberts
patent: 2838658 (1958-06-01), Vogel et al.
patent: 4419723 (1983-12-01), Wilson
Electronic Design 6, Mar. 15, 1977, "Revisiting the Cross-Field Inductor, " by T. A. O. Gross, pp. 82-85.
Miller, II Robert R.
Small Charles
Stothoff John H.
AT&T Information Systems
Pitts Harold I.
Williamson S. R.
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