Method and apparatus for improved transition from pulse width modulation to linear control
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United States of America Patent
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Jul 1, 2003
Issued Date -
N/A
app pub date -
Jan 30, 2001
filing date -
Oct 23, 1997
priority date (Note) -
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Abstract
A method and a circuit for switching a motor controller from pulse width modulation to linear control for a brush-less, sensor-less, poly-phase DC motor. The method includes steps of operating a drive circuit for a poly-phase direct current motor in a pulse width modulation mode and determining that a zero crossing will occur within a predetermined interval. The method also includes steps of enabling a bias current to a transconductance operational amplifier and changing an operating state of the drive circuit from the pulse width modulation mode to a linear mode. The method further includes steps of determining that the zero crossing has occurred, disabling the bias current to the transconductance operational amplifier and changing the operating state of the drive circuit from the linear mode to the pulse width modulation mode.
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