Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2008-03-04
2008-03-04
Lee, Benjamin C. (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S010340, C340S007320, C323S207000
Reexamination Certificate
active
11103062
ABSTRACT:
A power processing interface for a radio frequency identification system is provided. The power processing interface includes a resonance circuit for inducing a first signal transmitted from a terminal as an AC voltage, a first rectifier circuit electrically connected to the resonance circuit for converting the AC voltage into a DC voltage, a filter circuit electrically connected to the first rectifier circuit for generating an operating voltage in response to the DC voltage, a voltage-detecting circuit electrically connected to the filter circuit and the first rectifier circuit for detecting the magnitude of the operating voltage, a second rectifier circuit electrically connected to the resonance circuit, and a voltage-clamping modulation circuit electrically connected to the first rectifier circuit, the voltage-detecting circuit and the second rectifier circuit for controlling the conduction of the second rectifier circuit in response to the output of the voltage-detecting circuit so as to bypass the excessive current, and for providing a minimum voltage to the radio frequency identification system during the modulation process so as to keep the radio frequency identification system in a normal operation.
REFERENCES:
patent: 6011488 (2000-01-01), Busser
patent: 6167236 (2000-12-01), Kaiser et al.
patent: 6894616 (2005-05-01), Forster
patent: 7148661 (2006-12-01), Trainer et al.
patent: 7158091 (2007-01-01), Pillai et al.
patent: 2005/0242790 (2005-11-01), Kofler
Chen Chi-Bing
Hsu Chi-Ho
Shen Chun-Lin
Wang Minkun
Holtek Semiconductor Inc.
Lau Hoi C.
Volpe and Koenig P.C.
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