Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2008-02-28
2009-06-23
Patel, Rajnikant B (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S272000
Reexamination Certificate
active
07550955
ABSTRACT:
A disclosed power supply circuit (1) for receiving an input voltage at an input terminal (VDD), converting the input voltage to an output voltage and outputting the output voltage to a load (10) connected to an output terminal (OUT), comprises: a power supply circuit unit (2) for converting the input voltage to a predetermined constant voltage and outputting the converted voltage to the output terminal, the power supply circuit unit operating in accordance with a first control signal (CE); an output current detecting circuit unit (3) for detecting a current output (iout) from the power supply circuit unit, and outputting a second control signal when the detected current is smaller than a predetermined value i1; and an output voltage detecting circuit unit (4) for detecting a voltage output (Vout) from the power supply circuit unit, and operating while the output current detecting circuit unit outputs the second control signal, the output voltage detecting circuit unit stopping operation of the power supply circuit unit with the first control signal when the detected voltage exceeds a predetermined value Vdet1; whereby the output supply voltage detecting circuit unit makes the power supply circuit unit operate when the detected voltage becomes equal to or lower than a predetermined value Vdet2that is lower than the predetermined value Vdet1, and thereby the power supply circuit unit performs intermittent operations.
REFERENCES:
patent: 5191278 (1993-03-01), Carpenter
patent: 5625275 (1997-04-01), Tanikawa et al.
patent: 6812682 (2004-11-01), Hachiya
patent: 7049879 (2006-05-01), Osamura et al.
patent: 2734551 (1998-09-01), None
Dickstein & Shapiro LLP
Patel Rajnikant B
Ricoh & Company, Ltd.
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