Contactless inductive data-transmission system

Details Contactless inductive data-transmission system Contactless inductive data-transmission system

1991-08-23

1994-09-06

Peng, John K.

Communications: electrical

Continuously variable indicating

With particular transmitter

3408253, 34082554, 34082563, 455 41, G08C 1902

Patent

active

053452313

ABSTRACT:
A contactless inductive data transmission system provides bidirectional signal transfer between a sending-and-receiving station and one or more batteryless transponders. A high-frequency signal from the sending-and-receiving station is pulse width modulated for data transmission to a transponder and provides a system clock, which is extracted in both the sending-and-receiving station and in the transponder for synchronization, and provides the electrical power for operation of the transponder. The pulse width modulated signal is demodulated in the transponder for triggering a response wherein a modulating signal is applied by load modulation to the pulse width modulated high-frequency signal to form an information-carrying load modulated high-frequency signal, which is demodulated in the sending-and-receiving station.

REFERENCES:
patent: 3877028 (1975-04-01), Thomas
patent: 4519002 (1985-05-01), Amano
patent: 4742470 (1988-05-01), Juengel
patent: 4796028 (1989-01-01), MacKenthun et al.
patent: 4857893 (1989-08-01), Carroll
patent: 5041826 (1991-08-01), Milheiser

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