Fan system and brake control circuit thereof
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United States of America Patent
Stats
-
Oct 30, 2012
Grant Date -
Jul 28, 2011
app pub date -
Jan 27, 2010
filing date -
Jan 27, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A fan system including a motor with a coil, a storage unit, a driver, and a buffer circuit is provided. The coil module has a first connection terminal and a second connection terminal. The storage unit electrically couples with a voltage source, stores electrical energy when the voltage source is available, and releases the stored electrical energy to carry out a brake operation when the voltage source is unavailable. The driver electrically couples with the first and second connection terminals of the coil module to control a direction of an inductor current passing through the coil module. The buffer circuit electrically couples with the coil module. In the brake operation, the buffer circuit operates to form a transient potential between the first and second connection terminals of the coil module and to consume electrical energy of the inductor current, for gradually stopping the motor in a buffering time period.
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