Patent ID: 8456119

Claim:
A driving device of a brushless DC motor for a fan, the driving device comprising: a protection circuit electrically connected with an auxiliary power; a storage circuit electrically connected with the protection circuit; a control circuit electrically connected with the protection circuit and the storage circuit for receiving a first control signal, a second control signal, a third control signal and a fourth control signal; and a bridge circuit electrically connected with the control circuit and having a first switching unit, a second switching unit, a third switching unit and a fourth switching unit, wherein the first switching unit and the second switching unit are coupled with one end of a motor coil, the third switching unit and the fourth switching unit are coupled with the other end of the motor coil, the first switching unit is electrically connected with the third switching unit, and the second switching unit is electrically connected with the fourth switching unit, wherein the control circuit turns on the second switching unit and the fourth switching unit in a first operation period, turns on the first switching unit and the fourth switching unit in a second operation period, and turns on the second switching unit and the third switching unit in a third operation period, and the storage circuit receives the auxiliary power in the first operation period.