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. 30, 2005
Filed:
Sep. 15, 2004
Applicant:
Mamoru Kitamura, Tokyo, JP;
Inventor:
Mamoru Kitamura, Tokyo, JP;
Assignee:
Niigata Seimitsu Co., Ltd., Niigata, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03F003/38 ; H03F003/217 ;
U.S. Cl.
CPC ...
Abstract
A transformer, which converts input current into voltage output, is arranged between a power switch, which amplifies and outputs audio signals based on the power source voltage VDD supplied to MOS transistors Qto Q, and a speaker. Through appropriately determining the turns ratio (Ns/Np), without causing the power source voltage VDD of the power switchto be large, large voltage Vs is made to occur at both ends of the speakerfrom such small power source voltage VDD. Through this, large output power can be obtained.