Invention Application
WO2008019122A3 STARTUP AND SHUTDOWN CLICK NOISE ELIMINATION FOR CLASS D AMPLIFIER
审中-公开
启动和关闭点击噪音消除类D放大器
- Patent Title: STARTUP AND SHUTDOWN CLICK NOISE ELIMINATION FOR CLASS D AMPLIFIER
- Patent Title (中): 启动和关闭点击噪音消除类D放大器
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Application No.: PCT/US2007017460Application Date: 2007-08-06
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Publication No.: WO2008019122A3Publication Date: 2008-12-18
- Inventor: STRYDOM JOHAN TJEERD , HONDA JUN
- Applicant: INT RECTIFIER CORP , STRYDOM JOHAN TJEERD , HONDA JUN
- Assignee: INT RECTIFIER CORP,STRYDOM JOHAN TJEERD,HONDA JUN
- Current Assignee: INT RECTIFIER CORP,STRYDOM JOHAN TJEERD,HONDA JUN
- Priority: US82146006 2006-08-04; US83358707 2007-08-03
- Main IPC: H03F3/217
- IPC: H03F3/217
Abstract:
A method of minimizing an audible click noise from a speaker in a Class D audio power amplifier upon shutdown or startup of a switching stage having two switches series connected at a node, the speaker being connected to the node via an output filter comprising an inductor and a capacitor, the switches being controlled by a controller. The method including the steps of determining a timing interval at the node to transition a peak voltage of the capacitor, the capacitor voltage being a speaker voltage; and eliminating the audible transient voltage excursion across the speaker that causes a click noise during the timing interval, wherein at startup ON and OFF times of the switches are incrementally increased from zero to a normal mode and at shutdown the ON OFF times of the switches are incrementally decreased from the normal mode to zero.
Information query
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