DRIVE CIRCUIT FOR A BRUSHLESS MOTOR (as amended)
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United States of America Patent
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Issued Date -
Jan 28, 2016
app pub date -
Mar 10, 2014
filing date -
Mar 8, 2013
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Abstract
A drive circuit for a brushless motor comprising power lines for carrying an AC voltage, an inverter, and a controller. Each leg of the inverter is connected to a winding of the motor and comprises one or more bi-directional switches. The controller can output control signals that cause a pair of switches to conduct in one direction during the positive half-cycle of the AC voltage, and to conduct in the opposite direction during the negative half-cycle of the AC voltage. Alternatively, The controller can output control signals that cause a first pair of switches to conduct during the positive half-cycle of the AC voltage and a second pair of switches to conduct during the negative half-cycle of the AC voltage such that the winding is excited in the same direction irrespective of the polarity of the AC voltage.
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