Electricity: power supply or regulation systems – In shunt with source or load
Patent
1996-07-18
1998-03-24
Hecker, Stuart N.
Electricity: power supply or regulation systems
In shunt with source or load
342 44, G05F 110, G01S 1374
Patent
active
057316910
ABSTRACT:
In a transponder, power supply circuitry is connected to an antenna and a response circuit. DC power to be fed to the response circuit is generated out of an electromagnetic wave come in through the antenna. A rectifier diode has an n type and a p type semiconductor region and is adjusted such that a reverse resistance against a reverse current directed from the n type region toward the p type region is lower than a forward resistance against a forward current directed from the latter region to the former region. A voltage output from the antenna on the receipt of the electromagnetic wave is applied to the rectifier diode, thereby causing a reverse current to flow to the diode. The resulting DC voltage is used to feed power to the response circuit. Even when the electromagnetic wave received from an interrogator is weak, sufficient power can be surely fed to the response circuit.
REFERENCES:
patent: 4044303 (1977-08-01), Reindel
patent: 4087791 (1978-05-01), Lemberger
patent: 4786907 (1988-11-01), Koelle
patent: 4912471 (1990-03-01), Tyburski et al.
patent: 5247305 (1993-09-01), Hirata et al.
patent: 5287113 (1994-02-01), Meier
patent: 5305008 (1994-04-01), Turner et al.
A. G. Milnes, "Semiconductor Devices & Integrated Electronics", published 1980, Van Norstrand Reinhold, New York, pp. 178-179.
Hecker Stuart N.
OKI Electric Industry Co., Ltd.
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