Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2007-05-18
2009-06-02
Nguyen, Matthew V (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C315S18500S, C372S038040
Reexamination Certificate
active
07541785
ABSTRACT:
A load such as an LED and a constant-current source are connected in series with each other between the node of a dc-dc conversion type power supply circuit providing an output voltage and the ground. The constant-current source provides a constant current Io, the magnitude of which can be adjusted. The power supply circuit controls the output voltage such that the voltage drop across the constant-current source serving as a detection voltage becomes equal to a reference voltage. Thus, the load current can be varied within a predetermined range while avoiding the power loss due to an increase in the load current, thereby always permitting efficient operation of the load.
REFERENCES:
patent: 5966395 (1999-10-01), Ikeda
patent: 6204646 (2001-03-01), Hiramatsu et al.
patent: 6229833 (2001-05-01), Noda et al.
patent: 6400102 (2002-06-01), Ghanem
patent: 6577512 (2003-06-01), Tripathi et al.
patent: 6587490 (2003-07-01), Crawford
patent: 6697402 (2004-02-01), Crawford
patent: 7010007 (2006-03-01), Kobayashi
patent: 7071630 (2006-07-01), York
patent: 7265504 (2007-09-01), Grant
patent: 2003/0062881 (2003-04-01), Crawford
patent: 2005/0128168 (2005-06-01), D'Angelo
patent: 2005/0168419 (2005-08-01), Shimizu
patent: 0 567 280 (1993-10-01), None
patent: 61-254070 (1986-11-01), None
patent: 11-038049 (1999-02-01), None
patent: 2001215913 (2001-08-01), None
patent: 2001-313423 (2001-11-01), None
Khan, et al., “Power Electronics In Automotive Electrical Systems”, 1999 IEEE, pp. 29-38.
English translation of Chinese office action for corresponding Chinese application 200410062174.7 lists the reference above.
Hogan & Hartson LLP
Nguyen Matthew V
Rohm & Co., Ltd.
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