Patent ID: 9344017
Filing Date: 2016-05-17
CPC Classification: H02P

Claim Text:
1. A driving circuit for a single-phase brushless DC fan, which is used for driving a motor containing a first coil and a second coil, each of which comprises a first terminal and a second terminal, the driving circuit comprising: a switching unit coupled with the first coil and the second coil; an operation unit coupled with the switching unit, the first coil and the second coil; and a control unit generating a switching signal, wherein the switching unit receives the switching signal for driving the motor, and the control unit detects a rotation speed of the motor, wherein, when the rotation speed of the motor is greater than a predetermined rotation speed, the control unit outputs a first operation signal to the operation unit so that the first terminal of the first coil is coupled to the first terminal of the second coil and the second terminal of the first coil is coupled to the second terminal of the second coil, and when the rotation speed of the motor is less than or equal to the predetermined rotational speed, the control unit outputs a second operation signal to the operation unit so that the operation unit couples the second terminal of the first coil to the first terminal of the second coil.