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. 06, 1999
Filed:
Oct. 31, 1997
Kenichi Kokubo, Ota, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
In a power amplifier apparatus, a positive output signal of left front output amplifier (2LF), a negative output signal of left rear output amplifier (3LR), a negative output signal of right front output amplifier (3RF), and a positive output signal of right rear output amplifier (4RR) are applied to an adder (9), which selects the signal showing the highest level out of the four signals and generates a voltage corresponding to the selected signal. Switching power source (10) is adapted to operate according to the output signal of the adder (9) and produces a power source voltage to each of the high efficiency amplifiers. The positive output signal of the left front output amplifier and that of the right rear output amplifier are identical and substantially in-phase, whereas the negative output signal of the left rear output amplifier and that of the right front output amplifier are identical and substantially in-phase. Thus, a power source voltage is generated for each of the high efficiency amplifiers while providing fewer adders than the number of loads.