Apparatus and method for delivering power to a contactless porta

Details Apparatus and method for delivering power to a contactless porta Apparatus and method for delivering power to a contactless porta

1997-12-17

1999-05-18

Riley, Shawn

Electricity: power supply or regulation systems

Including a transformer or an inductor

With compensation

34087039, H01F27/42

Patent

active

059053720

ABSTRACT:
A terminal device powers a portable data device by transmitting in two modes of operation. In a first mode of operation, the terminal transmits to the portable data device a power signal at a first level and a data signal using a first modulation format and a first bit rate. In a second mode of operation, the terminal transmits to the portable data terminal a power signal at a second level and a data signal using a second modulation format and a second bit rate. The terminal determines a requirement to change modes of operation, and changes modes in response to changing power requirements of the portable data device.

REFERENCES:
patent: 4797541 (1989-01-01), Billings et al.
patent: 5325046 (1994-06-01), Young et al.
patent: 5396538 (1995-03-01), Hong
patent: 5455575 (1995-10-01), Schuermann
patent: 5495241 (1996-02-01), Donig et al.

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