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:
Dec. 19, 2000
Filed:
Jun. 16, 1999
Masami Takai, Tokyo, JP;
Yasuhiro Sugimoto, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Yasuhiro Sugimoto, Tokyo, JP;
Abstract
A hysteresis comparator circuit and a waveform generating circuit reduce a power consumption of a DC/DC converter so as to improve a power consumption efficiency when the DC/DC converter is operated with a relatively small load. The hysteresis comparator circuit is connected to a reference voltage source providing a reference voltage. A hysteresis comparator compares an input voltage with one of a first threshold voltage and a second threshold voltage. A hysteresis voltage generating circuit selectively generates one of the first and second threshold voltages by controlling a state of electric charge stored in each of the capacitors. An electric charge stored in the capacitors is provided from the reference voltage source.