Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2006-06-07
2010-02-16
Tso, Edward (Department: 2858)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S271000, C323S282000
Reexamination Certificate
active
07663356
ABSTRACT:
The invention includes a flip-flop circuit that controls a main switching element of a DC-DC converter by switching and an oscillation circuit that is connected to a set terminal of the flip-flop circuit and outputs an oscillation signal that gradually increases and decreases in oscillation frequency in accordance with an increase and decrease in output voltage value of the DC-DC converter when the DC-DC converter is in a transition state between a stop state and a steady operation state. In a process that the output voltage gradually rises and gradually falls, the oscillation frequency of the oscillation signal gradually rises and gradually falls, a time interval at which the main switching element is set into a conductive state is extended. No excess electric power is supplied to the output voltage, and the output voltage can be made to have a smooth ramp waveform.
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patent: 7122995 (2006-10-01), Hasegawa et al.
patent: 7250745 (2007-07-01), Yasukouchi et al.
patent: 2006/0238182 (2006-10-01), Yoshino
patent: 2007/0090818 (2007-04-01), Nishimori
patent: 2007/0139023 (2007-06-01), Hasegawa
patent: 9-154275 (1997-06-01), None
Diao M'Baye
Fujitsu Microelectonics Limited
Fujitsu Patent Center
Tso Edward
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