Forward and reverse drive control circuit for single-phase brushless DC fan motor
A technology for driving a control circuit and a DC fan, applied in the direction of rotation direction control, starting devices, etc., can solve the problems of reducing the heat dissipation capacity, accumulating large dust, and the single-phase fan motor cannot realize reverse start and reverse rotation, etc. Improve reliability, avoid the accumulation of dust, and maintain smooth effect of forward and reverse switching process
Active Publication Date: 2018-09-25
EUTECH MICROELECTRONICS
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Problems solved by technology
However, due to the asymmetrical structure of the single-phase brushless DC fan motor 90, the static frictional resistance prevents the single-phase fan motor from being unable to achieve reverse start and reverse rotation. If it runs in a fixed direction, a large amount of dust will accumulate in some fixed positions of the chassis after a long time, reducing the heat dissipation capacity
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[0036] The technical means adopted by the present invention to achieve the intended invention purpose are further described below in conjunction with the drawings and preferred embodiments of the present invention.
[0037] figure 1 It is the forward and reverse drive control circuit 1 of the single-phase brushless DC fan motor proposed by the present invention. The forward and reverse drive control circuit 1 includes a direction-changing soft switching circuit 20, a gating circuit 21, a switch circuit 11, and a logic control circuit 22. , a power driving circuit 30 , a starting circuit 40 , a command determination circuit 50 , a control clock 60 and a single-phase brushless DC fan motor 80 . The starting circuit 40 includes a forward rotation angle detection unit 41 and a forward rotation time detection unit 42 . The forward and reverse command control terminal DR provides forward and reverse commands; the first position sensor signals H1+ and H1- are the position informati...
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The invention relates to a forward and backward rotation driving control circuit for a single-phase brushless DC fan motor. The control circuit comprises a backward rotation start circuit, a forward and backward rotation control clock, a forward and backward rotation changeover switch circuit, a forward and backward rotation instruction determining circuit, a power driving circuit, a direction change switching circuit, a gating circuit and a logic control circuit. Via the driving control circuit, the single-phase brushless DC fan motor can rotate in forward and backward directions freely, dust accumulation in certain fixed positions after long-time work of equipment and apparatuses is avoided, and electronic equipment and apparatuses are cleaned automatically. Compared with a traditional sensor-free forward and backward rotation control scheme for the three-phase brushless DC fan motor, the technical scheme of the invention is lower in cost.
Description
technical field [0001] The invention relates to a forward and reverse drive control circuit, in particular to a forward and reverse drive control circuit for a single-phase brushless DC fan motor. Background technique [0002] Brushless DC motors have been widely used in cooling fan motors of various electronic devices. Under normal circumstances, as long as the fan motor is controlled to rotate forward to reach a certain speed, the heat dissipation effect can be achieved. But once the motor runs in a fixed positive direction for a long time, a lot of dust will accumulate in some corners of electronic equipment and instruments. For example, in desktop computers, there are usually three-phase DC brushless cooling fans or single-phase DC brushless cooling fans. [0003] Taking the three-phase DC brushless cooling fan as an example, Figure 8 A schematic structural diagram of a sensorless three-phase brushless DC fan motor 70 is given, which is fully symmetrical in structure,...
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IPC IPC(8): H02P6/30H02P6/22
Inventor 孙江
Owner EUTECH MICROELECTRONICS