Fan motor driving apparatus and method, cooling system including the same, and electronic equipment
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United States of America Patent
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Nov 8, 2016
Grant Date -
Apr 28, 2016
app pub date -
Oct 20, 2015
filing date -
Oct 22, 2014
priority date (Note) -
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Abstract
A motor driving apparatus comprises an H bridge circuit having outputs coupled with a motor coil of a single-phase motor, a hall comparator configured to generate a hall detection signal indicating a position of a rotor of the motor, an electric angle generator configured to generate a pulse signal indicating that the motor rotates by a predetermined electric angle, a current monitoring circuit configured to asserts a zero current detection signal upon detecting a reversed direction of a coil current; a transition trigger circuit configured to assert a transition pulse when a count value of the first counter matches an lead angle set value; a logic circuit configured to transition the H bridge circuit according to a predetermined sequence of states; and a lead angle controller configured to adjust the lead angle set value based on a timing of assertion of the zero current detection signal.
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