US 2012/0068650 A1Published application

Driving device of brushless dc motor for fan and driving method thereof

AssigneeDelta Electronics, Inc.

InventorsYen-Hung WU, Tsung-Jung Hsieh

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Abstract

A driving device of a brushless DC motor for a fan includes a protection circuit, a storage circuit, a control circuit and a bridge circuit. The protection circuit is electrically connected with an auxiliary power. The storage circuit electrically connected with the protection circuit receives the auxiliary power. The control circuit is electrically connected with the protection circuit and the storage circuit. The bridge circuit electrically connected with the control circuit has a first switching unit, a second switching unit, a third switching unit and a fourth switching unit. The first and second switching units 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.

Claims12

Dependent claims

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.

3 more elements

A driving method of a brushless DC motor for a fan being used in conjunction with a driving device, wherein the driving device has a protection circuit, a storage circuit, a control circuit and a bridge circuit, the protection circuit is electrically connected with an auxiliary power, the storage circuit is electrically connected with the protection circuit, the control circuit is electrically connected with the protection circuit and the storage circuit and receives a first control signal, a second control signal, a third control signal and a fourth control signal, the bridge circuit is electrically connected with the control circuit, and the bridge circuit has 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, the driving method comprising:

respectively turning on the second switching unit and the fourth switching unit according to the second control signal and the fourth control signal in a first operation period, such that the storage circuit receives and stores the auxiliary power in the first operation period, and enters one of a second operation period and a third operation period;
respectively turning on the first switching unit and the fourth switching unit according to the first control signal and the fourth control signal in the second operation period, and entering the third operation period;
and
respectively turning on the second switching unit and the third switching unit according to the second control signal and the third control signal in the third operation period, and entering the second operation period.

1 more element

Dependencies are inferred from the claim text.