Registers – Coded record sensors – Particular sensor structure
Patent
1986-04-14
1989-01-10
Cardillo, Raymond F.
Registers
Coded record sensors
Particular sensor structure
235492, 235493, 363 97, 363 26, 323901, 364483, G06K 708, G06K 1906
Patent
active
047975415
ABSTRACT:
A power transfer arrangement provides regulated power transfer from a station to a contactless portable data card without the need for regulation circuitry on the card itself. The station includes a primary coil for magnetically coupling power to a secondary coil, located on the card, when the data card is brought into close association with the station. The arrangment includes a microprocessor, a power amplifier including the primary coil, a variable voltage source and apparatus for measuring current flow in the primary coil. When the portable data card is not in close association with the station, the microprocessor causes the variable voltage source to provide a sequence of stepped voltages. Quiescent current flow is measured at each step and stored in memory. When the portable data card is brought into close association with the station, the microprocessor causes the variable voltage source to provide a sequence of stepped voltages. Active current flow is measured at each step and stored in memory. Power delivered to the data card is calculated as the difference between active and quiescent currents--multiplied by the magnitude of the variable voltage source. The sequence of active current measurements continues until the calculated value of power delivered to the data card exceeds a predetermined threshold power, at which time the data card is receiving a precise, predetermined amount of power.
REFERENCES:
patent: 4032830 (1977-06-01), Buonavita
patent: 4277837 (1981-07-01), Stuckert
patent: 4463353 (1984-07-01), Kuzara
patent: 4480178 (1984-10-01), Miller et al.
patent: 4578758 (1986-03-01), Muller
patent: 4605844 (1986-08-01), Haggan
patent: 4650981 (1987-03-01), Foletta
patent: 4674618 (1987-06-01), Eglise et al.
patent: 4675516 (1987-06-01), Guion
patent: 4692604 (1987-09-01), Billings
IEEE Transactions on Biomedical Engineering, vol. BME-27, No. 8, 8/80, W. Ko et al., "RF-Powered Cage System . . . " pp. 460-467.
"Smart Credit Cards: The Answer to Cashless Shopping", IEEE Spectrum, S. B. Weinstein, 2/84, pp. 43-49.
"Smart Cards" Scientific American, R. McIvor, 11/85, pp. 152-159.
Billings Robert L.
Bowers Mark A.
Meier Frankie G.
American Telephone and Telegraph Company--AT&T Information Syste
Cardillo Raymond F.
Morra Michael A.
Weinhardt Robert A.
LandOfFree
Power regulator for a contactless credit card system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power regulator for a contactless credit card system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power regulator for a contactless credit card system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2108790