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:
Jul. 31, 2007
Filed:
Oct. 27, 2004
Katsuyuki Yasukouchi, Kasugai, JP;
Hidenobu Ito, Kasugai, JP;
Katsuyuki Yasukouchi, Kasugai, JP;
Hidenobu Ito, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a DC-DC converter of synchronous rectifying system, a control circuit of DC-DC converter capable of improving the control voltage value of output voltage at light load and enhancing the power conversion efficiency, and its control method are presented. An inverting input terminal of comparator COMPof which non-inverting input terminal is connected to a grounding potential is connected to one terminal of choke coil Lby way of terminal (X). An output terminal (N) of comparator COMPis connected to a delay circuit DL, and an output terminal (N) of delay circuit DL is connected to AND gate circuit AND. The delay circuit DL is a circuit for delaying the transition from high level to low level of input terminal (N). Excessive power supplied more than demanded by the load at light load is returned to choke coil L. Elevation of output voltage VOUT due to excess power accumulated in output capacitor Ccan be suppressed.