Load driving device and portable apparatus utilizing such...

Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source

Reexamination Certificate

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C315S18500S, C372S038040

Reexamination Certificate

active

07944189

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.

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