Motor driving circuit, cooling device and electronic apparatus including the same
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United States of America Patent
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Oct 24, 2017
Issued Date -
N/A
app pub date -
Jul 7, 2015
filing date -
Jul 9, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A circuit for driving a fan motor includes: a control input interface circuit configured to generate a first digital value indicating an input duty ratio; a duty calculation unit configured to generate a duty command value linearly increasing with a slope with respect to the first digital value; a digital pulse width modulator configured to generate a control pulse having an output duty ratio corresponding to the duty command value; an output circuit configured to drive a fan motor based on the control pulse; a lock protection circuit configured to switch between an enable state and a disable state and to stop supply of power to the fan motor when lock of the fan motor is detected in the enable state; and a torque-off determination unit configured to switch the lock protection circuit to the disable state in a torque-off state.
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