Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2007-06-26
2007-06-26
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
10879315
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.
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Khan, et al., “Power Electronics In Automotive Electrical Systems”, 1999 IEEE, pp. 29-38.
Hogan & Hartson LLP
Nguyen Matthew V.
Rohm & Co., Ltd.
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