Control apparatus for starting a direct current brushless motor and method thereof
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United States of America Patent
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Apr 24, 2012
Grant Date -
Jul 16, 2009
app pub date -
Dec 29, 2008
filing date -
Jan 15, 2008
priority date (Note) -
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Abstract
An apparatus for starting a direct current brushless motor and a method thereof are provided. The direct current brushless motor comprises a plurality of windings. The control apparatus comprises a sense amplifier, a differential circuit, and a control circuit. The sense amplifier is configured to detect a first back electro-motive force of a non-electrified first winding. The differential circuit is configured to calculate a differential value of the first back electro-motive force. The control circuit is configured to provide a current to two of the windings and to switch the current to another two of the windings to start the direct current brushless motor.
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