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:
Sep. 13, 2005
Filed:
Jan. 16, 2004
Tomohisa Okuno, Tenri, JP;
Tomohisa Okuno, Tenri, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A voltage conversion circuit alternately controls ON/OFF of a PMOS transistor and an NMOS transistor that are provided in series between high voltage power source lines, and outputs a low voltage obtained by causing a filter circuit to smooth an output voltage of each transistor. Further, the voltage conversion circuit uses the output voltage of the filter circuit as a power source of an output pulse signal generating circuit for driving the two transistors. Further, the voltage conversion circuit causes a start-up signal generating circuit to generate a start-up signal for forcing the PMOS transistor to turn ON during a predetermined period on start-up, and causes a switch control circuit to select the start-up signal instead of the pulse signal from the output pulse signal generating circuit, thereby realizing sure start-up.