Electricity: power supply or regulation systems – Including a transformer or an inductor – With compensation
Patent
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.
Carney Scott Nelson
Hall Thomas Glenn
Kuffner Stephen Leigh
Coffing James A.
Egan Wayne J.
Motorola Inc.
Riley Shawn
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