Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2011-08-23
2011-08-23
Choi, Jacob Y (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S2090SC, C315S225000, C363S060000
Reexamination Certificate
active
08004213
ABSTRACT:
The power supply of the present invention is composed of: a charge pump circuit (54) that periodically turns on and off a plurality of charge-transfer switches (Q1to Q4) according to clock signals (c1and c2), thereby charges and discharges a charge storage capacitor (C1) and thus produces the desired output voltage (Vo) from an input voltage (Vi) to supply it to a load (LED); an output current detection circuit57for detecting an output current Io (a reference current (Im) thereof in FIG.1) to the load; and means (a frequency conversion circuit52in FIG.1) that varies the frequency of the clock signals c1and c2based on the result of the detection of the output current Io. With this configuration, it is possible to achieve high electric power efficiency irrespective of the magnitude of a load.
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Choi Jacob Y
Fish & Richardson P.C.
Rohm & Co., Ltd.
Vu Jimmy T
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