| 摘要 |
<p>A brushless DC motor driver has a DC-AC converter circuit, a detection circuit, a comparison circuit and a control circuit. The DC-AC converter circuit has switching elements. The detection circuit is configured to detect an electric current flowing through a motor coil of a brushless DC motor. The comparison circuit is configured to, if the electric current reaches or exceeds an over-current threshold, generate an over-current detection signal. The control circuit is configured to unenergize the switching elements for a first breaking time if the detection circuit generates the over-current detection signal in a start phase. The control circuit is also configured to unenergize the switching elements for a second breaking time longer than the first breaking time if the detection circuit generates the over-current detection signal in a steady phase.</p> |
