The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 2010
Filed:
Jun. 07, 2006
Koichi Inatomi, Kasugai, JP;
Koichi Inatomi, Kasugai, JP;
Fujitsu Microelectonics Limited, Tokyo, JP;
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.