DIGITAL NOISE REDUCTION FOR MOTOR

PROBLEM TO BE SOLVED: To provide a system and a method for reducing fan noise by controlling a drive current to a fan motor. SOLUTION: In one embodiment, the system approximates a linear drive while using a number of transistors in parallel and sequentially activating the transistors. In another emb...

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Bibliographic Details
Main Authors COLLINS MARK E, MARSHALL SUMNER B III
Format Patent
LanguageEnglish
Published 15.03.2007
Subjects
CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS
CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
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Summary:PROBLEM TO BE SOLVED: To provide a system and a method for reducing fan noise by controlling a drive current to a fan motor. SOLUTION: In one embodiment, the system approximates a linear drive while using a number of transistors in parallel and sequentially activating the transistors. In another embodiment, a certain scheme is used to activate and deactivate transistors in discrete steps, thereby achieving the benefits of the linear controller topology. COPYRIGHT: (C)2007,JPO&INPIT
Bibliography:Application Number: JP20060171618