Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2008-03-25
2008-03-25
Berhane, Adolf (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
Reexamination Certificate
active
07348765
ABSTRACT:
This patent specification describes a DC-DC converter which includes a switch configured to control an output voltage, a driver circuit configured to drive the switch, a flip-flop configured to control the driver circuit, an error amplifier configured to compare a feedback voltage of the output voltage with a reference voltage, a detector configured to sense an output current, a control voltage generator configured to generate a control voltage being ramped and a PWM comparator configured to compare the control voltage with an output voltage of the error amplifier and output a reset signal to the flip-flop. Ramping speed of the control voltage is changed in accordance with an external-control voltage input at an external-control terminal.
REFERENCES:
patent: 6346798 (2002-02-01), Passoni et al.
patent: 7098639 (2006-08-01), Natsume et al.
patent: 7098640 (2006-08-01), Brown
patent: 7170273 (2007-01-01), Sase et al.
patent: 3459470 (2003-08-01), None
patent: 2004-260509 (2004-09-01), None
Berhane Adolf
Cooper & Dunham LLP
Ricoh & Company, Ltd.
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