CN107859647B - Frequency modulation speed regulation interface circuit, fan speed regulation system and speed regulation method - Google Patents
Frequency modulation speed regulation interface circuit, fan speed regulation system and speed regulation method Download PDFInfo
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- CN107859647B CN107859647B CN201711023876.8A CN201711023876A CN107859647B CN 107859647 B CN107859647 B CN 107859647B CN 201711023876 A CN201711023876 A CN 201711023876A CN 107859647 B CN107859647 B CN 107859647B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000003287 optical effect Effects 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Control Of Electric Motors In General (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The embodiment of the invention discloses a frequency modulation and speed regulation interface circuit, a fan speed regulation system and a speed regulation method, wherein the frequency modulation and speed regulation interface circuit is connected between a user input device and a micro control unit, the user input device inputs a speed regulation value to the micro control unit through the frequency modulation and speed regulation interface circuit, the frequency modulation and speed regulation interface circuit comprises an interface and a pull-up resistor, and the interface comprises an input interface connected with the user input device and an output interface connected with the micro control unit; one end of the pull-up resistor is connected with the input interface and a circuit power supply, and the other end of the pull-up resistor is connected with the output interface and used for transmitting the pulse signal from the user input device to the micro control unit from the output interface, so that the micro control unit matches the corresponding speed regulation value according to the frequency of the pulse signal to adjust the rotating speed of the fan. The embodiment of the invention can avoid the influence of temperature, realize high-precision fan speed regulation and ensure that the output speed of the fan meets the target speed required by a user.
Description
Technical Field
The embodiment of the invention relates to the technical field of electricity, in particular to a frequency modulation and speed regulation interface circuit, a fan speed regulation system and a speed regulation method.
Background
As is well known, some production processes need to be performed under a certain air pressure and air volume, so that the fan equipment is widely applied to aspects of dust removal, ventilation, air blowing and the like. The fan realizes ventilation and blowing functions mainly by driving the impeller to operate through the motor.
So far, the speed regulation interface circuit is an essential important part in the fan application industry. In the prior art, a general speed regulation interface circuit is generally a voltage regulation and speed regulation interface circuit and a duty ratio regulation and speed regulation interface circuit, and a micro control unit inside a fan regulates the output of speed by detecting the change of duty ratio or level. However, the above general speed regulation methods all have the defect that the high-precision requirement of the user on the speed regulation cannot be met, and the general speed regulation methods are generally isolated through the digital optical coupler, when the temperature changes, the rising edge and the falling edge of the digital optical coupler in the speed regulation interface circuit can change, so that the speeds of the same input value of the user expressed at different temperatures are different, and the output speed of the fan is finally influenced to be inconsistent with the target speed of the user.
Disclosure of Invention
The embodiment of the invention provides a frequency modulation speed regulation interface circuit, a fan speed regulation system and a speed regulation method, which are used for avoiding the influence of temperature and realizing high-precision fan speed regulation.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a frequency and speed adjustment interface circuit, which is connected between a user input device and a micro control unit, where the user input device inputs a speed adjustment value to the micro control unit through the frequency and speed adjustment interface circuit, the frequency and speed adjustment interface circuit includes an interface and a pull-up resistor, and the interface includes an input interface connected with the user input device and an output interface connected with the micro control unit;
one end of the pull-up resistor is connected with the input interface and a circuit power supply, and the other end of the pull-up resistor is connected with the output interface and used for transmitting a pulse signal from a user input device from the output interface to the micro control unit, so that the micro control unit matches a corresponding speed regulation value according to the frequency of the pulse signal to adjust the rotating speed of the fan.
In a second aspect, an embodiment of the present invention provides a fan, including a micro control unit, and further including the frequency modulation and speed regulation interface circuit of the first aspect;
the frequency and speed regulating interface circuit is connected with the micro control unit and is used for processing pulse signals from a user input device and transmitting the processed pulse signals to the micro control unit;
and the micro control unit is used for determining the frequency of the processed pulse signal and matching a corresponding speed regulating value according to the frequency so as to adjust the rotating speed of the fan.
In a third aspect, an embodiment of the present invention provides a fan speed control system, including a user input device, and further including the fan described in the second aspect.
In a fourth aspect, an embodiment of the present invention provides a fan speed control method, which is implemented by using the fan speed control system provided in the third aspect, and the method includes:
the method comprises the steps that a user input device obtains an input speed regulation numerical value and forms a pulse signal corresponding to the speed regulation numerical value;
the frequency and speed regulation interface circuit processes the pulse signal and transmits the processed pulse signal to the micro control unit;
and the micro control unit determines the frequency of the processed pulse signal and matches a corresponding speed regulating value according to the frequency so as to regulate the rotating speed of the fan.
According to the frequency modulation and speed regulation interface circuit, the fan speed regulation system and the speed regulation method provided by the embodiment of the invention, the micro control unit can detect the frequency of the pulse signal at the detection point by providing the detection point of the frequency of the pulse signal, match the speed regulation value corresponding to the frequency and regulate the rotating speed of the fan, so that the influence of temperature is avoided, good speed regulation precision can be shown at different temperatures in the whole fan speed regulation process, high-precision fan speed regulation is realized, and the output speed of the fan can be ensured to meet the target speed required by a user.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an fm interface circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fan according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a fan speed control system according to a third embodiment of the present invention;
fig. 4 is a schematic flow chart of a fan speed regulation method according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of an fm interface circuit according to an embodiment of the present invention. As shown in fig. 1, the embodiment of the present invention provides a frequency modulation and speed regulation interface circuit, which sets a rotation speed by using different frequency changes of a pulse signal, and provides a detection point of a pulse signal frequency, so that a micro control unit can detect the frequency of the pulse signal at the detection point, match a speed regulation value corresponding to the frequency, and adjust the rotation speed of a fan, thereby solving the problem of unstable speed regulation accuracy of the fan at different temperatures.
The frequency and speed regulation interface circuit is connected between a user input device and the micro control unit, the user input device inputs a speed regulation value to the micro control unit through the frequency and speed regulation interface circuit, the frequency and speed regulation interface circuit comprises an interface and a pull-up resistor, and the interface comprises an input interface connected with the user input device and an output interface connected with the micro control unit;
one end of the pull-up resistor 12 is connected with the input interface 11 and a circuit power supply, and the other end is connected with the output interface 13, and is used for transmitting a pulse signal from a user input device from the output interface 13 to the micro control unit, so that the micro control unit matches a corresponding speed regulation value according to the frequency of the pulse signal, and the rotating speed of the fan is adjusted.
The user input device and the fm interface circuit are connected by wired communication. The user input device refers to an input device provided for a user, and the user can input original data into the fan system through the input device through the frequency modulation and speed regulation interface so as to realize information exchange with a micro control unit in the fan system. Typical input devices include: a keyboard, a mouse, a handwriting input board, a voice input device, or the like.
In one embodiment, preferably, a digital optical coupler 14 is disposed at a power input end of the fm interface circuit, and in the fm interface circuit, an input end of the digital optical coupler 14 is connected in series with a current-limiting resistor 15 and connected to the input interface, and an output end of the digital optical coupler is connected to a control loop of the fm interface circuit, so as to perform an isolation function, so that there is no electrical direct connection between the two isolated circuits, thereby preventing interference caused by the electrical connection, especially between the low-voltage control circuit and an external high-voltage circuit. In addition, the digital optical coupler 14 is also used for converting the pulse signal into a pulse signal which meets the voltage requirement of the micro-control unit.
Specifically, the input end of the digital optical coupler is connected with a light emitter (an infrared Light Emitting Diode (LED)), the output end of the digital optical coupler is connected with a light receiver (a photosensitive semiconductor tube), when the input end has an electric signal, the light emitter emits light, the light receiver is conducted after receiving an optical signal, photocurrent is generated, and the photocurrent flows out from the output end. The light emitter of the digital optical coupler comprises two input pins (an anode and a cathode), wherein one input pin (the anode) is connected with the input interface, and the other input pin (the cathode) is grounded; the light receiver also includes two output pins (collector and emitter), one output pin (collector) is connected to a circuit power supply and pull-up resistor, and the other output pin (emitter) is connected in series with a resistor to ground. The input pin (anode) and the output pin (emitter) of the digital optical coupler use different places, and mutual interference can be avoided by isolation. The pull-up resistor is used for limiting the current of the branch and improving the driving capability of the I/O port of the micro control unit. And a circuit power supply connected to the output end of the digital optical coupler adopts 3.3VDC, so that an output signal of the digital optical coupler is a level signal meeting the voltage requirement of the micro-control unit.
It should be noted that, in this embodiment, the fm speed control interface circuit is further configured with other electronic components and their matching circuits, such as a band-stop triode, a capacitor, a resistor, etc., which are used to eliminate errors and improve response speed.
According to the frequency-modulation speed-regulation interface circuit provided by the embodiment of the invention, the micro control unit can detect the frequency of the pulse signal at the detection point by providing the detection point of the frequency of the pulse signal, match the speed-regulation numerical value corresponding to the frequency and regulate the rotating speed of the fan, so that the influence of temperature is avoided, good speed-regulation precision can be shown at different temperatures in the whole speed-regulation process of the fan, high-precision speed regulation of the fan is realized, and the output speed of the fan can be ensured to meet the target speed required by a user.
Example two
Referring to fig. 2, an embodiment of the present invention provides a fan, including a micro control unit 22, and further including a frequency modulation and speed regulation interface circuit 21 provided in the first embodiment;
the frequency and speed regulating interface circuit 21 is connected with the micro control unit 22 and is used for processing a pulse signal from a user input device and transmitting the processed pulse signal to the micro control unit 22;
and the micro control unit 22 is used for determining the frequency of the processed pulse signal and matching a corresponding speed regulating value according to the frequency so as to regulate the rotating speed of the fan.
On the basis of the above technical solution, preferably, the fan provided by this embodiment further includes a motor.
The micro control unit is connected with the motor, and after the micro control unit obtains a speed regulation value required by a user according to the frequency of the pulse signal, the micro control unit generates a control instruction so as to control the work of the motor to meet the requirement of the user.
According to the fan provided by the embodiment of the invention, the rotating speed is set by adopting different frequency changes of the pulse signal, the detection point of the frequency of the pulse signal is provided, so that the micro-control unit can detect the frequency of the pulse signal at the detection point, match the speed regulation value corresponding to the frequency and adjust the rotating speed of the fan, the influence of temperature is avoided, good speed regulation precision can be shown at different temperatures in the whole speed regulation process of the fan, high-precision speed regulation of the fan is realized, and the output speed of the fan can be ensured to meet the target speed required by a user.
EXAMPLE III
Referring to fig. 3, an embodiment of the present invention provides a fan speed control system, which includes a user input device 31 and a fan 32 provided in the second embodiment.
Preferably, the fan speed regulating system further comprises an external power supply;
and the external power supply is connected with the fan speed regulating system and is used for providing electric energy for the whole system.
It should be noted that the external power supply may be a 220V household ac or dc battery pack, which is determined according to actual requirements.
According to the fan speed regulating system provided by the embodiment of the invention, the rotating speed is set by adopting different frequency changes of the pulse signals, the micro control unit can detect the frequency of the pulse signals at the detecting point by providing the detecting point of the frequency of the pulse signals, the speed regulating value corresponding to the frequency is matched, and the rotating speed of the fan is regulated, so that the influence of temperature is avoided, good speed regulating precision can be shown at different temperatures in the whole fan speed regulating process, high-precision fan speed regulation is realized, and the output speed of the fan can be ensured to meet the target speed required by a user.
Example four
Fig. 4 is a schematic flow chart of a fan speed control method according to a fourth embodiment of the present invention. The method is executed by the fan speed regulating system provided by the embodiment of the invention, and comprises the following steps:
s401, the user input device obtains an input speed regulation numerical value and forms a pulse signal corresponding to the speed regulation numerical value.
The range of the throttle value input by the user is 10kHz to 100 kHz.
And S402, the frequency modulation and speed regulation interface circuit processes the pulse signal and transmits the processed pulse signal to a micro control unit.
It should be noted that the processing of the pulse signal by the fm speed control circuit refers to the isolation and level conversion of the digital optical coupler, and the voltage of the processed pulse signal is pulled up to 3.3V, which conforms to the operating voltage of the MCU, but the frequency and pulse width information are not changed.
And S403, the micro control unit determines the frequency of the processed pulse signal and matches a corresponding speed regulation value according to the frequency so as to adjust the rotating speed of the fan.
It should be noted that the memory in the fan system stores a preset frequency and speed regulation value comparison table. When a user inputs a speed regulation value through the user input device, the processed pulse signal with different frequencies is finally provided for the micro control unit to receive, and the micro control unit can determine the speed regulation value matched with the frequency of the processed pulse signal by calling the frequency and speed regulation value comparison table.
According to the fan speed regulation method provided by the embodiment of the invention, the rotating speed is set by adopting different frequency changes of the pulse signal, the detection point of the frequency of the pulse signal is provided, so that the micro control unit can detect the frequency of the pulse signal at the detection point, match the speed regulation value corresponding to the frequency and adjust the rotating speed of the fan, the aim of avoiding the influence of temperature on the digital optical coupler can be achieved, good speed regulation precision can be shown at different temperatures in the whole fan speed regulation process, high-precision fan speed regulation is realized, and the output speed of the fan can be ensured to meet the target speed required by a user.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (4)
1. The utility model provides a frequency modulation speed governing interface circuit, connects between user input device and little the control unit, user input device passes through frequency modulation speed governing interface circuit is right little the control unit carries out the input of speed governing numerical value, frequency modulation speed governing interface circuit includes interface and pull-up resistance, the interface include with the input interface that user input device connects, and with the output interface that little the control unit is connected, its characterized in that:
one end of the pull-up resistor is connected with the input interface and a circuit power supply, and the other end of the pull-up resistor is connected with the output interface and used for transmitting a pulse signal from a user input device from the output interface to the micro control unit, so that the micro control unit matches a corresponding speed regulation value according to the frequency of the pulse signal to regulate the rotating speed of the fan;
the power input end of the frequency and speed regulation interface circuit is provided with a digital optical coupler, in the frequency and speed regulation interface circuit, the input end of the digital optical coupler is connected with a current limiting resistor in series and connected with the input interface, and the output end of the digital optical coupler is connected with a control loop of the frequency and speed regulation interface circuit.
2. A blower comprising a micro control unit, further comprising a fm speed interface circuit as claimed in claim 1;
the frequency and speed regulating interface circuit is connected with the micro control unit and is used for processing pulse signals from a user input device and transmitting the processed pulse signals to the micro control unit;
and the micro control unit is used for determining the frequency of the processed pulse signal and matching a corresponding speed regulating value according to the frequency so as to adjust the rotating speed of the fan.
3. A fan governor system including a user input device and further including a fan as recited in claim 2.
4. A fan speed control method implemented using the fan speed control system of claim 3, the method comprising:
the method comprises the steps that a user input device obtains an input speed regulation numerical value and forms a pulse signal corresponding to the speed regulation numerical value;
the frequency and speed regulation interface circuit processes the pulse signal and transmits the processed pulse signal to the micro control unit;
and the micro control unit determines the frequency of the processed pulse signal and matches a corresponding speed regulating value according to the frequency so as to regulate the rotating speed of the fan.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711023876.8A CN107859647B (en) | 2017-10-27 | 2017-10-27 | Frequency modulation speed regulation interface circuit, fan speed regulation system and speed regulation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711023876.8A CN107859647B (en) | 2017-10-27 | 2017-10-27 | Frequency modulation speed regulation interface circuit, fan speed regulation system and speed regulation method |
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| CN107859647A CN107859647A (en) | 2018-03-30 |
| CN107859647B true CN107859647B (en) | 2020-01-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116045473A (en) * | 2022-12-22 | 2023-05-02 | 珠海格力电器股份有限公司 | Air conditioner control method and device, air conditioner and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201490966U (en) * | 2009-05-11 | 2010-05-26 | 中国人民解放军总后勤部建筑工程研究所 | Speed-adjusting inversion control device for power generating set |
| CN102003400A (en) * | 2010-12-28 | 2011-04-06 | 易事特电力系统技术有限公司 | Direct current fan speed regulation and fault sensing circuit |
| CN102185555A (en) * | 2010-12-28 | 2011-09-14 | 上海智大电子有限公司 | Digitalized alternating-current voltage and speed regulation device |
| CN203027198U (en) * | 2013-01-02 | 2013-06-26 | 宁波齐心电子有限公司 | Optocoupler-isolated practical voltage regulating and speed regulating circuit |
| CN203146378U (en) * | 2012-11-30 | 2013-08-21 | 杭州顿力电器有限公司 | Isolated property speed regulation circuit for outer rotor electronic control type air blowers |
-
2017
- 2017-10-27 CN CN201711023876.8A patent/CN107859647B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201490966U (en) * | 2009-05-11 | 2010-05-26 | 中国人民解放军总后勤部建筑工程研究所 | Speed-adjusting inversion control device for power generating set |
| CN102003400A (en) * | 2010-12-28 | 2011-04-06 | 易事特电力系统技术有限公司 | Direct current fan speed regulation and fault sensing circuit |
| CN102185555A (en) * | 2010-12-28 | 2011-09-14 | 上海智大电子有限公司 | Digitalized alternating-current voltage and speed regulation device |
| CN203146378U (en) * | 2012-11-30 | 2013-08-21 | 杭州顿力电器有限公司 | Isolated property speed regulation circuit for outer rotor electronic control type air blowers |
| CN203027198U (en) * | 2013-01-02 | 2013-06-26 | 宁波齐心电子有限公司 | Optocoupler-isolated practical voltage regulating and speed regulating circuit |
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Effective date of registration: 20240529 Address after: 201300 buildings 19, 21, 24, 26, 27, 28, 29, 30, 32 and 33, No. 399, Xuanzhong Road, Nanhui Industrial Park, Pudong New Area, Shanghai Patentee after: EBM papst motor (Shanghai) Co.,Ltd. Country or region after: China Address before: 200131, No. 418 Huajing Road, Waigaoqiao, Pudong New Area, Shanghai Patentee before: EBM-PAPST VENTILATOR (SHANGHAI) Co.,Ltd. Country or region before: China |
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Address after: No. 1, 2, and 9, Lane 196, Yuntong Road, Pudong New Area, Shanghai, 201299 Patentee after: EBM papst motor (Shanghai) Co.,Ltd. Country or region after: China Address before: 201300 buildings 19, 21, 24, 26, 27, 28, 29, 30, 32 and 33, No. 399, Xuanzhong Road, Nanhui Industrial Park, Pudong New Area, Shanghai Patentee before: EBM papst motor (Shanghai) Co.,Ltd. Country or region before: China |