CN114389509B - Fan motor controller - Google Patents
Fan motor controller Download PDFInfo
- Publication number
- CN114389509B CN114389509B CN202011127530.4A CN202011127530A CN114389509B CN 114389509 B CN114389509 B CN 114389509B CN 202011127530 A CN202011127530 A CN 202011127530A CN 114389509 B CN114389509 B CN 114389509B
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- CN
- China
- Prior art keywords
- frequency
- fan
- fan motor
- motor controller
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/24—Controlling the direction, e.g. clockwise or counterclockwise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
A fan motor controller has a pulse width modulation signal, a switching circuit, a control unit and a frequency judging unit. The switch circuit is coupled to a fan motor for providing a driving current to the fan motor. The control unit generates a control signal to the switch circuit for controlling the switch circuit. The frequency judging unit receives the pulse width modulation signal to generate a judging signal to the control unit. The pulse width modulation signal is used for adjusting the rotating speed of a fan. The pulse width modulated signal has a frequency. The fan motor controller switches the forward and reverse rotation of the fan according to the frequency and a judgment rule.
Description
Technical Field
The present invention relates to a fan motor controller, and more particularly, to a fan motor controller capable of switching the forward and reverse rotation of a fan by a pulse width modulation signal.
Background
Fig. 1 is a schematic diagram of a conventional fan motor controller 10. The fan motor controller 10 receives a voltage signal VCC, a voltage signal GND, a PWM signal PWM, a rotational speed signal FG and a rotational direction signal FR for controlling the operation of the fan motor. The voltage signal VCC and the voltage signal GND are used for providing power to the fan motor controller 10. The pulse width modulation signal PWM is used to adjust the rotation speed of the fan. The rotation speed signal FG is used for providing the rotation speed of the fan for system interpretation. When the system wants to switch the fan in the forward and reverse direction, the rotation direction signal FR needs to be increased. Thus, this prior art approach increases the cost of the fan and creates difficulties in matching the system to the fan motor controller 10.
Disclosure of Invention
In view of the foregoing, it is an objective of the present invention to provide a fan motor controller capable of switching a fan forward/reverse rotation function by a pulse width modulation signal.
According to the present invention, the fan motor controller is provided. The fan motor controller receives a voltage signal VCC, a voltage signal GND, the PWM signal and a rotational speed signal for controlling the operation of a fan motor. The pulse width modulation signal is used for adjusting the rotating speed of the fan. The fan has an original rotational direction. The fan motor controller is provided with a switch circuit, a control unit and a frequency judging unit. The switch circuit is coupled to the fan motor for providing a driving current to the fan motor. The control unit generates a control signal to the switch circuit for controlling the switch circuit. The pulse width modulated signal has a frequency. The fan motor controller can switch the forward and reverse rotation functions of the fan according to the frequency. The frequency judging unit receives the pulse width modulation signal to obtain the frequency of the pulse width modulation signal. In addition, the frequency judging unit generates a judging signal to the control unit according to the frequency to inform the control unit whether to change the rotation direction of the fan to run or not. When the judging signal is at a low level, the control unit enables the fan to run in the original rotation direction. When the judging signal is at a high level, the control unit enables the fan to run in a rotation direction different from the original rotation direction. According to different judging rules, at least four specific embodiments can be as follows:
1. when the frequency is greater than a first frequency, the frequency judging unit enables the judging signal to be at the high level and the control unit enables the fan to run in a rotation direction different from the original rotation direction. 2. When the frequency is smaller than a second frequency, the frequency judging unit enables the judging signal to be at the high level and the control unit enables the fan to run in a rotation direction different from the original rotation direction. 3. When the frequency is greater than a third frequency and the frequency is less than a fourth frequency, the frequency judging unit makes the judging signal be at the high level and the control unit makes the fan run in a rotation direction different from the original rotation direction, wherein the fourth frequency is greater than the third frequency. 4. When the frequency is smaller than a fifth frequency or the frequency is larger than a sixth frequency, the frequency judging unit makes the judging signal be at the high level and the control unit makes the fan run in a rotation direction different from the original rotation direction, wherein the sixth frequency is larger than the fifth frequency.
Drawings
Fig. 1 is a schematic diagram of a conventional fan motor controller.
Fig. 2 is a schematic diagram of a fan motor controller according to an embodiment of the invention.
Fig. 3 is a circuit diagram of a fan motor controller according to an embodiment of the invention.
Reference numerals illustrate: 10-fan motor controller; 20-a fan motor controller; VCC-voltage signal; GND-voltage signal; FG-rotational speed signal; FR-rotation direction signal; an M-fan motor; 200-a switching circuit; 210-a control unit; 220-a frequency judgment unit; PWM-pulse width modulation signals; vc-control signal; vd-judgment signal.
Detailed Description
The objects, features, and advantages of the present invention will become more apparent from the following description. Preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.
Fig. 2 is a schematic diagram of a fan motor controller 20 according to an embodiment of the invention. The fan motor controller 20 receives a voltage signal VCC, a voltage signal GND, a pulse width modulation signal PWM and a rotational speed signal FG for controlling the operation of a fan motor M. The voltage signal VCC and the voltage signal GND are used for providing power to the fan motor controller 20. The PWM signal is used for adjusting the rotating speed of a fan. The rotation speed signal FG is used to provide the rotation speed of the fan for a system to interpret. The fan has an original rotational direction.
Fig. 3 is a circuit diagram of a fan motor controller 20 according to an embodiment of the invention. The fan motor controller 20 has a switching circuit 200, a control unit 210 and a frequency determination unit 220. The switch circuit 200 is coupled to the fan motor M for providing a driving current to the fan motor M. The control unit 210 generates a control signal Vc to the switching circuit 200 for controlling the switching circuit 200. The PWM signal PWM has a Duty Cycle (Duty Cycle) and a frequency. When the duty cycle approaches 1, the fan motor controller 20 may drive the fan to run at full speed. The fan motor controller 20 may adjust the rotational speed of the fan according to the duty cycle. The fan motor controller 20 according to an embodiment of the present invention can achieve the function of switching the forward and reverse rotation of the fan according to the frequency. The frequency determining unit 220 receives the PWM signal PWM to obtain the frequency of the PWM signal PWM. In addition, the frequency determining unit 220 generates a determining signal Vd to the control unit 210 according to the frequency F to inform the control unit 210 whether to change the rotation direction of the fan for operation. When the determination signal Vd is at a low level, the control unit 210 makes the fan operate in the original rotation direction. When the determination signal Vd is at a high level, the control unit 210 makes the fan operate in a rotation direction different from the original rotation direction. For example, if the original rotation direction of the fan is forward rotation and the determination signal Vd is high, the control unit 210 makes the fan operate in reverse rotation. If the original rotation direction of the fan is reverse rotation and the determination signal Vd is high, the control unit 210 makes the fan rotate in a forward direction. According to different judging rules, at least four specific embodiments can be as follows:
1. when the frequency is smaller than a first frequency, the frequency determining unit 220 makes the determining signal Vd be at a low level and the control unit 210 makes the fan operate in the original rotation direction. When the frequency is greater than the first frequency, the frequency judging unit 220 makes the judging signal Vd high and the control unit 210 makes the fan operate in a rotation direction different from the original rotation direction. 2. When the frequency is greater than a second frequency, the frequency determining unit 220 makes the determining signal Vd be at a low level and the control unit 210 makes the fan operate in the original rotation direction. When the frequency is smaller than the second frequency, the frequency judging unit 220 makes the judging signal Vd be at a high level and the control unit 210 makes the fan operate in a rotation direction different from the original rotation direction. According to an embodiment of the present invention, the first frequency and the second frequency can be independently determined without correlation therebetween, so that the first frequency can be the same or different from the second frequency depending on the actual requirements. 3. When the frequency is smaller than a third frequency or the frequency is larger than a fourth frequency, the frequency determining unit 220 makes the determination signal Vd be at a low level and the control unit 210 makes the fan operate in the original rotation direction, wherein the fourth frequency is larger than the third frequency. When the frequency is greater than the third frequency and the frequency is less than the fourth frequency, the frequency judging unit 220 makes the judging signal Vd be at a high level and the control unit 210 makes the fan operate in a rotation direction different from the original rotation direction. 4. When the frequency is greater than a fifth frequency and the frequency is less than a sixth frequency, the frequency determining unit 220 makes the determination signal Vd be at a low level and the control unit 210 makes the fan operate in the original rotation direction, wherein the sixth frequency is greater than the fifth frequency. When the frequency is smaller than the fifth frequency or the frequency is larger than the sixth frequency, the frequency judging unit 220 makes the judging signal Vd be at a high level and the control unit 210 makes the fan operate in a rotation direction different from the original rotation direction.
The fan motor controller 20 according to an embodiment of the present invention can be applied to a three-phase fan motor. The fan motor controller 20 has a pulse width modulation signal PWM, a switching circuit 200, a control unit 210, and a frequency determination unit 220. The switching circuit 200 is coupled to the fan motor M for providing a driving current to the fan motor M. The control unit 210 generates a control signal Vc to the switching circuit 200 for controlling the switching circuit 200. The frequency determining unit 220 receives the PWM signal PWM to generate a determining signal Vd to the control unit 210. The pulse width modulation signal PWM is used to adjust the rotation speed of the fan. The PWM signal PWM has a frequency. The fan motor controller 20 switches the fan to rotate forward and backward according to the frequency and a judgment rule. The fan motor controller 20 of an embodiment of the present invention does not need a rotation direction signal FR, thereby reducing the cost of the fan and making it easier to match the system with the fan motor controller 20.
While the invention has been described by way of examples of preferred embodiments, it should be understood that: the invention is not limited to the embodiments disclosed herein. On the contrary, the invention is intended to cover various modifications and similar arrangements that are apparent to those skilled in the art. Accordingly, the scope of protection is to be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (11)
1. A fan motor controller, comprising:
a pulse width modulation signal for adjusting a rotation speed of a fan, wherein the pulse width modulation signal has a frequency, and the fan has an original rotation direction;
a switch circuit for providing a driving current to a fan motor; and
and a control unit for generating a control signal to the switching circuit for controlling the switching circuit, wherein the fan motor controller determines whether the fan is operated in a rotation direction different from the original rotation direction according to the frequency.
2. The fan motor controller of claim 1 further comprising a frequency determination unit that receives the pwm signal to generate a determination signal to the control unit, wherein the control unit causes the fan to operate in the original rotational direction or in a rotational direction different from the original rotational direction based on a high/low level of the determination signal.
3. The fan motor controller of claim 1 wherein the fan motor controller is applied to a three-phase fan motor.
4. The fan motor controller of claim 1, wherein the fan is operated in the rotational direction different from the original rotational direction when the frequency is greater than a first frequency.
5. The fan motor controller of claim 4, wherein the fan is operated in the original rotational direction when the frequency is less than the first frequency.
6. The fan motor controller of claim 1 wherein the fan is operated in a rotational direction different from the original rotational direction when the frequency is less than a second frequency.
7. The fan motor controller of claim 6 wherein when the frequency is greater than the second frequency, the fan is turned in the original direction of rotation.
8. The fan motor controller of claim 1, wherein when the frequency is greater than a third frequency and the frequency is less than a fourth frequency, the fan is operated in the direction of rotation different from the original direction of rotation, the fourth frequency being greater than the third frequency.
9. The fan motor controller of claim 8, wherein when the frequency is less than the third frequency or the frequency is greater than the fourth frequency, the fan is de-energized in the original rotational direction.
10. The fan motor controller of claim 1, wherein the fan is operated in the rotational direction different from the original rotational direction when the frequency is less than a fifth frequency or the frequency is greater than a sixth frequency, the sixth frequency being greater than the fifth frequency.
11. The fan motor controller of claim 10, wherein when the frequency is greater than the fifth frequency and the frequency is less than the sixth frequency, the fan is de-energized in the original rotational direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011127530.4A CN114389509B (en) | 2020-10-20 | 2020-10-20 | Fan motor controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011127530.4A CN114389509B (en) | 2020-10-20 | 2020-10-20 | Fan motor controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114389509A CN114389509A (en) | 2022-04-22 |
| CN114389509B true CN114389509B (en) | 2023-08-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011127530.4A Active CN114389509B (en) | 2020-10-20 | 2020-10-20 | Fan motor controller |
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| Country | Link |
|---|---|
| CN (1) | CN114389509B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2662531Y (en) * | 2003-07-31 | 2004-12-08 | 台达电子工业股份有限公司 | Rotary speed control circuit for fan motor |
| CN102142802A (en) * | 2011-03-22 | 2011-08-03 | 北京航天控制仪器研究所 | Servo driving system of linear direct-current brushless motor |
| CN102904524A (en) * | 2011-07-26 | 2013-01-30 | 建准电机工业股份有限公司 | Motor control method |
| CN205864299U (en) * | 2016-08-02 | 2017-01-04 | 晋锋科技股份有限公司 | Rotating speed aligning gear in the radiator fan motor of electronic installation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10317861B2 (en) * | 2015-09-04 | 2019-06-11 | Asia Vital Components Co., Ltd. | Switch drive circuit capable of saving timers of fan processor |
-
2020
- 2020-10-20 CN CN202011127530.4A patent/CN114389509B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2662531Y (en) * | 2003-07-31 | 2004-12-08 | 台达电子工业股份有限公司 | Rotary speed control circuit for fan motor |
| CN102142802A (en) * | 2011-03-22 | 2011-08-03 | 北京航天控制仪器研究所 | Servo driving system of linear direct-current brushless motor |
| CN102904524A (en) * | 2011-07-26 | 2013-01-30 | 建准电机工业股份有限公司 | Motor control method |
| CN205864299U (en) * | 2016-08-02 | 2017-01-04 | 晋锋科技股份有限公司 | Rotating speed aligning gear in the radiator fan motor of electronic installation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114389509A (en) | 2022-04-22 |
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