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:
Apr. 06, 2010
Filed:
Feb. 28, 2008
Shiah Siew Wong, Singapore, SG;
Wee Sien Hong, Singapore, SG;
Chee Kuan Leong, Singapore, SG;
Narciso Repollo Semira, Singapore, SG;
Shiah Siew Wong, Singapore, SG;
Wee Sien Hong, Singapore, SG;
Chee Kuan Leong, Singapore, SG;
Narciso Repollo Semira, Singapore, SG;
Panasonic Corporation, Osaka, JP;
Panasonic Semiconductor Asia Pte. Ltd., Singapore, SG;
Abstract
A class D amplifier with output DC offset protection is disclosed. The DC offset protection receives a PWM input signals from the outputs and investigates the PWM output signals whether there is a large DC voltage difference is being reflected on the speaker load. If so, shutdown signal SD will be sent by the DC offset protection to the PWM control logic and gate driver, thus, shutting down the output of the class D system and preventing disastrous condition from being develop across the speaker.