Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2006-10-31
2006-10-31
Easthom, Karl (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S901000
Reexamination Certificate
active
07129679
ABSTRACT:
The voltage booster type switching power supply circuit is provided with a drive circuit for controlling a switching element, a start/stop circuit for turning the drive circuit on and off according to a brightness control signal for adjusting a brightness of a light source of a liquid crystal display device, an output voltage detection circuit for detecting whether the output voltage is greater than a predetermined voltage and feeding out a result as a comparison result signal, and a soft-start circuit that does not operate when the comparison result signal is active on the rising edge of the brightness control signal, and that operates so as to increase the output voltage gradually when the comparison result signal is inactive on the rising edge of the brightness control signal.
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Inaba Katsumi
Kanamori Atsushi
Satoh Tsutomu
Warita Hirohisa
Behm Harry R
Birch & Stewart Kolasch & Birch, LLP
Easthom Karl
Sharp Kabushiki Kaisha
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