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.

Date of Patent:
Jun. 27, 2006

Filed:

Mar. 30, 2005
Applicants:

Toshinori Inagawa, Saitama, JP;

Motohiro Shimizu, Saitama, JP;

Kenji Kamimura, Saitama, JP;

Inventors:

Toshinori Inagawa, Saitama, JP;

Motohiro Shimizu, Saitama, JP;

Kenji Kamimura, Saitama, JP;

Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F 1/56 (2006.01); H02M 3/06 (2006.01);
U.S. Cl.
CPC ...
Abstract

An N-channel MOS transistor is used to configure a DC—DC converter having good characteristics without providing a particular voltage circuit which outputs a voltage higher than an input voltage. An N-channel MOS transistorand a choke coilare connected in series between a negative side of a direct-current power supply and a negative side of the output capacitor. A PWM circuitapplies pulse signals to a gate of the MOS transistorbased on the input voltage divided by the capacitorsand. The pulse signal of the PWM circuitis formed by the voltage corresponding to the output voltage of the output capacitor, and the pulse signal is inputted to the gate of the N-channel MOS transistorthrough a photocoupler


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