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:
Aug. 08, 2006
Filed:
Aug. 19, 2004
Masashi Kameda, Mie, JP;
Kazuhisa Shibata, Mie, JP;
Hiroshi Nakanishi, Mie, JP;
Shinichi Terakami, Mie, JP;
Toshihide Eguchi, Mie, JP;
Masashi Kameda, Mie, JP;
Kazuhisa Shibata, Mie, JP;
Hiroshi Nakanishi, Mie, JP;
Shinichi Terakami, Mie, JP;
Toshihide Eguchi, Mie, JP;
Noritake Co., Ltd., Aichi, JP;
Noritake Itron Corporation, Mie, JP;
Abstract
A power supply circuit for a vacuum fluorescent display includes a boosting coil, input terminal, switching transistor, PWM control circuit, boosting circuit, first filament terminal, and second filament terminal. The boosting coil is provided in a current path to generate an induced voltage in accordance with a change in current flowing therein. The input terminal receives a DC voltage to be applied to one terminal of the boosting coil. The switching transistor is provided between the other terminal of the boosting coil and a ground line. The PWM control circuit periodically turns on/off the switching transistor. The boosting circuit generates a boosted voltage on the basis of an induced voltage generated at the other terminal of the boosting coil when the switching transistor is switched from ON to OFF. The first terminal is connected to the node between the other terminal of the boosting coil and the switching transistor. A DC voltage lower than the induced voltage generated at the other terminal of the boosting coil is applied to the second terminal.