CN114421833A - Control device for two-wire DC fan - Google Patents
Control device for two-wire DC fan Download PDFInfo
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- CN114421833A CN114421833A CN202210319136.3A CN202210319136A CN114421833A CN 114421833 A CN114421833 A CN 114421833A CN 202210319136 A CN202210319136 A CN 202210319136A CN 114421833 A CN114421833 A CN 114421833A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- 230000033228 biological regulation Effects 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 230000001276 controlling effect Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 10
- 230000017525 heat dissipation Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
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- 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
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
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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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- 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
- F04D27/006—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by influencing fluid temperatures
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Abstract
The application provides a controlling means of two line direct current fans for control two line direct current fans's rotational speed, include: a first interface and a second interface; the controller is used for acquiring the temperature of the working environment of the two-wire direct current fan speed regulating device and outputting a corresponding fan rotating speed gear control logic value according to the temperature; the first level conversion module receives a fan rotating speed gear control logic value and converts the fan rotating speed gear control logic value into an amplitude signal; the gear output latching module receives the amplitude signal and outputs and latches a corresponding fan working gear value; the speed regulation execution module is used for receiving the working gear value of the fan and controlling the rotating speed of the fan; the speed regulation execution module comprises at least two switch circuits which are connected in parallel, the input ends of the switch circuits are electrically connected with the power supply unit, the output ends of the switch circuits are electrically connected with the electrical interfaces of the two-wire direct current fans, the voltage drops of the switch circuits are different, and one of the switch circuits is selected to be conducted according to the work gear value of the fan.
Description
Technical Field
The application relates to the field of heat dissipation, concretely relates to control device of two-wire direct current fan.
Background
The current two-wire direct current fan is a device which converts direct current electric energy into electromagnetic energy and then converts the electromagnetic energy into mechanical energy to drive a fan blade to rotate. When the fan with the structure is used, direct-current voltage is usually adopted for power supply, the voltage is 9V, 12V, 24V and the like, the working current is about 100mA, and the size is selectable from 3.5 to 12 CM. The heat dissipation block is embedded on the surface of an IC chip or fixed on a flange of a special structure through screws, and wind circulation heat dissipation is performed on the component.
The existing two-wire direct current fan is widely applied to various scenes with different heat dissipation requirements due to the characteristics of small power, various sizes, silence and high cost performance. The operation and stop of the fan are generally controlled according to the temperature change of the heat dissipation part.
However, since the external electrical interface of the fan only has two connections (i.e., a power line and a ground line) and no speed control line, it can only be operated or not operated by turning on or off the power supply.
The general speed regulation method of the existing direct current cooling fan is that a temperature control resistor is connected in series in a motor of the cooling fan, when the temperature changes, the temperature control resistor changes accordingly, the resistance value of the fan motor connected in series with the temperature control resistor changes, the working voltage of the fan motor changes after the resistance value changes, and the rotating speed of the motor changes after the voltage changes, so that the rotating speed of the fan can be regulated.
However, although the speed can be adjusted by this design, the change of the rotation speed of the fan becomes very sensitive along with the change of the resistance value of the temperature control resistor, and the fan is in a state of switching the rotation speed frequently for a long time, which is not favorable for the service life of the fan.
Disclosure of Invention
The purpose of the application is to provide a technical scheme, and solve the problem that a two-wire direct current fan is in a high-frequency switching rotating speed state for a long time in the prior art.
In view of the above technical problem, the present application provides a control device for a two-wire dc fan, for controlling the rotation speed of the two-wire dc fan, the device including:
the first interface is used for being detachably connected with the power supply unit;
a second interface comprising two circuit connections for detachable connection with the electrical interface of the two-wire DC fan;
the controller is used for acquiring the temperature of the working environment of the two-wire direct current fan speed regulating device and outputting a corresponding fan rotating speed gear control logic value according to the temperature;
the first level conversion module is used for receiving the fan rotating speed gear control logic value and converting the fan rotating speed gear control logic value into an amplitude signal;
the gear output latching module is used for receiving the amplitude signal output by the first level conversion module, outputting a corresponding fan working gear value according to the amplitude signal and latching the fan working gear value;
the speed regulation execution module is used for receiving the fan working gear value and controlling the rotating speed of the fan according to the fan working gear value;
the speed regulation execution module comprises at least two switch circuits which are connected in parallel, the input ends of the switch circuits are commonly and electrically connected with the power supply unit, the output ends of the switch circuits are commonly and electrically connected with the electrical interfaces of the two-wire direct current fans, the voltage drops of the switch circuits are different, and one of the switch circuits is selected to be conducted according to the work gear value of the fan.
Further, the first level shift module includes a first level shift circuit, and the first level shift circuit is configured to receive the fan speed gear control logic value sent by the controller, and convert the fan speed gear control logic value into an amplitude signal that can be recognized by the gear output latch module.
Further, the fan speed gear control logic value comprises a high level and a low level, and the first level conversion module converts the high level into an amplitude signal which can be identified by the gear output latch module.
Further, the controller comprises a GPIO interface, and the GPIO interface is used for outputting the fan rotating speed gear control logic value;
the high level in the fan rotating speed gear control logic value is 3.3V, and a 3.3V high level signal in the fan rotating speed gear control logic value is converted into a 12V amplitude signal through the first level conversion module.
Further, the control device further includes:
the gear detection module comprises a second level conversion unit and is used for receiving the fan working gear value output by the gear output latching module, converting the fan working gear value into a gear reading signal through the second level conversion unit, feeding the gear reading signal back to the controller, and identifying the current fan working gear value by the controller according to the gear reading signal.
Furthermore, the gear output latch module comprises output ends, the number of the output ends of the gear output latch module corresponds to the number of the switch circuits, and the output end of each gear output latch module is respectively connected with the control end of each switch circuit;
the output end of each gear output latch module respectively outputs a high level or a low level to form the working gear value of the fan, and when the output end of any gear output latch module outputs a high level, the switch circuit corresponding to the output end of the gear output latch module is started.
Furthermore, the second level shift unit includes second level shift circuits, the number of the second level shift circuits corresponds to the number of the output ends of the gear output latch module, and the input ends of the second level shift circuits are respectively connected with the output ends of the gear output latch module;
the second level conversion circuit is used for converting a high level and a low level which form the value of the working gear of the fan into voltage signals which can be identified by the controller, and the voltage signals output by the second level conversion circuits form the gear reading signal.
Further, the controller comprises a GPIO interface, and the second level conversion circuit converts the high level and the low level that constitute the fan operating range value into voltage signals that can be received by the GPIO interface, and feeds back the range reading signal to the controller through the GPIO interface.
Furthermore, the speed regulation execution module comprises three switch circuits connected in parallel, wherein each switch circuit comprises a switch tube, and the control end of each switch tube is electrically connected with the output end of the gear output latch module;
the input end of each switching tube is connected with the power supply unit through diodes with different numbers;
and the output ends of the switching tubes are connected with the second interface together.
Furthermore, at least two temperature intervals are arranged in the controller, and the number of the temperature intervals corresponds to the number of the switching circuits in the speed regulation execution module;
when the controller detects that the temperature of the working environment of the two-wire direct current fan speed regulating device is in any temperature range, the controller outputs a corresponding fan rotating speed gear control logic value, and the speed regulating execution module controls the rotating speed of the two-wire direct current fan to be in a corresponding gear.
The control device reads a temperature value of a fan working environment through a controller, converts a temperature range into a fan rotating speed gear control logic value, transmits the fan rotating speed gear control logic value to a gear output latch module after passing through a level conversion module, and allows a fan working gear value output by the gear output latch module to enter a speed regulation execution module.
Drawings
Fig. 1 is a schematic diagram of a control apparatus of a two-wire dc fan according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a first level shift module provided in the present application;
FIG. 3 is a schematic diagram of a gear output latch module provided herein;
FIG. 4 is a schematic diagram of a throttle actuator module provided herein;
FIG. 5 is a schematic diagram of the connection between the gear output latch module and the speed adjustment execution module provided in the present application;
FIG. 6 is a schematic diagram of a control apparatus for a two-wire DC fan according to another embodiment of the present application;
FIG. 7 is a schematic diagram of a gear detection module provided herein.
Detailed Description
The present invention will be described in detail with reference to the specific embodiments shown in the drawings, which are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the specific embodiments are included in the scope of the present invention.
With the increase of integration of electronic, communication and electrical devices, the power consumption of the devices is also increasing, and at the same time, the heat generation of the devices is also increasing. Thus, heat dissipation and cooling of the device become an important concern. At present, air cooling is still the main mode for cooling equipment. The two-wire direct current fan is widely applied to various different heat dissipation requirement scenes due to the characteristics of small power, various sizes, silence and high cost performance.
However, since the external electrical interface of the two-wire dc fan only has two connections, i.e., a power line and a ground line, and no speed control line, it is only possible to control the operation or non-operation thereof by turning on or off the power supply. However, most of the ways of turning on or off the power are enabled by the temperature variation value of the temperature sensor, and when the temperature variation is sensitive, the fan is frequently started and stopped. For example, when the temperature rises to a certain threshold, the fan starts to operate, and when the temperature falls to a certain threshold, the fan stops operating.
Therefore, this method cannot achieve a stable and reliable operation state within a certain range of the temperature curve. For example, this method cannot realize that the low power consumption mode is adopted when the temperature of the fan working environment is low, and the fan rotates at a low speed; and when the temperature is high, a high power consumption mode is adopted, and the fan works at full speed at the moment. In addition, the working mode of the fan without speed regulation control can also have certain influence on the service life of the fan.
The control device of the two-wire direct current fan aims at solving the problem that a plurality of devices adopting the two-wire direct current fan cannot realize speed regulation or are in a high-frequency switching rotating speed state for a long time at present. The control device can be connected between the two-wire direct current fan and the power supply unit in series, so that the rotating speed of the two-wire direct current fan can be controlled, and the problem that the fan is in a high-frequency rotating speed switching state is solved.
As shown in fig. 1, the present application provides a control apparatus for a two-wire dc fan, the apparatus comprising: the controller comprises a first interface, a second interface, a controller 100, a first level conversion module 200, a gear output latch module 300 and a speed regulation execution module 400.
The first interface is used for being detachably connected with the power supply unit. And the second interface comprises two circuit connecting wires which are detachably connected with the electrical interface of the two-wire direct current fan.
And the controller 100 is used for acquiring the temperature of the working environment of the two-wire direct current fan speed regulating device and outputting a corresponding fan rotating speed gear control logic value according to the temperature.
The first level conversion module 200 is configured to receive the fan speed gear control logic value, and convert the fan speed gear control logic value into an amplitude signal.
And a gear output latch module 300, configured to receive the amplitude signal output by the first level shift module 200, output a corresponding fan operating gear value according to the amplitude signal, and latch the fan operating gear value.
And the speed regulation execution module 400 is used for receiving the fan working gear value and controlling the fan rotating speed according to the fan working gear value. The speed-adjusting execution module 400 includes at least two switch circuits connected in parallel, the input terminals of the switch circuits are electrically connected to the power supply unit, the output terminals of the switch circuits are electrically connected to the electrical interfaces of the two-wire dc fans, and the voltage drops of the switch circuits are different, and one of the switch circuits is selected to be turned on according to the operating gear value of the fan.
As shown in fig. 2, as an alternative implementation manner, the first level shift module 200 includes a first level shift circuit, and the first level shift circuit is configured to receive a fan speed step control logic value sent by the controller 100, and convert the fan speed step control logic value into an amplitude signal that can be recognized by the step output latch module 300.
The fan speed gear control logic value includes a high level and a low level, and the first level shift module 200 converts the high level into an amplitude signal that can be recognized by the gear output latch module 300.
The controller 100 includes a GPIO interface, and outputs the fan speed and gear control logic value through the GPIO interface. The high level in the fan speed gear control logic value is 3.3V, and a 3.3V high level signal in the fan speed gear control logic value is converted into a 12V amplitude signal through the first level conversion module 200.
Specifically, as shown in fig. 2, an embodiment of a first level shift module 200 provided in the present application is illustrated. The first level shift module 200 includes an input terminal connected to the GPIO output terminal of the controller 100. As an alternative implementation manner, the high level voltage output by the GPIO output terminal of the controller 100 is 3.3V, and the high level signal of 3.3V in the fan speed gear control logic value is converted into an amplitude signal of 12V by the first level conversion circuit.
The first level shift module 200 further includes a micro switch and an RC circuit, wherein one end of the micro switch is connected to the GPIO port of the controller 100 as the input end of the first level shift module 200. The GPIO port of the controller 100 is connected to the first level shifter module 200 through a micro switch and an RC circuit. As an alternative implementation, a diode may be connected in series between the GPIO port of the controller 100 and the micro-switch in order to prevent current conduction.
As an optional implementation manner, the gear output latch module 300 includes output ends, the number of the output ends of the gear output latch module 300 corresponds to the number of the switch circuits, and the output ends of the gear output latch modules 300 are respectively connected to the control ends of the switch circuits;
the output end of each gear output latch module 300 outputs a high level or a low level to form the operating gear value of the fan, and when the output end of any gear output latch module 300 outputs a high level, the switch circuit corresponding to the output end of the gear output latch module 300 is activated.
As shown in fig. 3, one implementation of the range output latch module 300 provided by the present application is shown. As an alternative implementation, the present application utilizes a decimal count pulse divider to implement the function of the gear output latch module 300.
The decimal count pulse distributor includes 10 decode inputs, a clock signal input, and a count reset REST input. The Schmitt trigger at the clock signal input end has a pulse shaping function. The counter reset REST terminal can clear the counter to be in a 0 state, when the REST terminal is in a low level, the decimal counting pulse distributor counts on the rising edge of the clock, otherwise, the counting function is invalid. When the REST end is in a high level, the decimal counting pulse distributor is cleared.
As an alternative implementation manner, the fan speed gear control logic value output by the controller 100 is processed by the first level conversion module 200 to become an amplitude signal that can be recognized by the decimal counting pulse distributor, and the amplitude signal is input as a clock pulse to the clock signal input end of the decimal counting pulse distributor. According to the clock pulse corresponding to the amplitude signal, the decimal counting pulse distributor selects a decoding output end to output a decoding result, and the decoding result can be used as an expression form of the value of the fan operating gear.
The decimal count pulse distributor has 10 decoding output ends, and as an optional implementation manner, 3 decoding output ends are selected as the output ends of the gear output latch module 300 in the present application.
As shown in fig. 4, an implementation of the throttle execution module 400 provided by the present application is shown. As shown in fig. 4, the speed-adjusting executing module 400 includes three parallel switch circuits, wherein each switch circuit includes a switch tube, and a control end of each switch tube is electrically connected to an output end of the gear-output latching module 300. The input end of each switching tube is connected with the power supply unit through diodes with different numbers. And the output ends of the switching tubes are connected with the second interface together.
As shown in fig. 5, it shows a schematic diagram of the connection between the gear output latch module 300 and the speed regulation executing module 400 provided by the present application. In the embodiments provided herein, the present application selects 3 decoded outputs of the decimal count pulse divider as the outputs of the shift output latch module 300. The three decoding output ends are respectively connected with the control end of a switch tube. According to the decoding result of the decimal counting pulse distributor, the output of one decoding output end in the 3 decoding output ends is high level, and the output of the other two decoding output ends is low level. At this time, the switch tube corresponding to the decoding output end outputting the high level is conducted.
The three parallel switch circuits in the speed-adjusting execution module 400 represent three gears of the fan during operation. Because the switching tubes in each switching circuit are connected to the power supply unit through different numbers of diodes, the voltage provided by the power supply unit may be different at the final output voltage of the speed-adjusting execution module 400 after different switching circuits are selected due to the voltage division effect of the diodes. The output voltage of the speed-regulating execution module 400 is used for driving the two-wire direct current fan to work, and the rotation speed of the fan can be directly influenced by different output voltages. Therefore, the control device of the two-wire direct current fan can effectively control the rotating speed of the two-wire direct current fan. Meanwhile, since the number of diodes on each switching circuit is fixed, the output voltage of each switching circuit can be kept stable. Compared with the existing counting method using the temperature-sensitive resistor and the fan which are connected in series, the fan can keep stable rotating speed under each gear, so that the rotating speed of the fan is not in a high-frequency switching state, and the service life of the fan is prolonged.
Fig. 6 is a schematic diagram showing a control apparatus of a two-wire dc fan according to another embodiment of the present application. As an optional implementation manner, the control apparatus of the two-wire dc fan provided in this embodiment further includes a gear detection module 500. The gear detection module 500 includes a second level conversion unit 501, configured to receive the fan operating gear value output by the gear output latch module 300, convert the fan operating gear value into a gear reading signal through the second level conversion unit 501, feed back the gear reading signal to the controller 100, and identify the current fan operating gear value according to the gear reading signal by the controller 100.
As an optional implementation manner, the second level shift unit 501 includes second level shift circuits, the number of the second level shift circuits corresponds to the number of the output ends of the gear output latch module 300, and the input ends of the second level shift circuits are respectively connected to the output ends of the gear output latch module 300;
the second level shift circuits are configured to convert a high level and a low level, which constitute the fan operating range value, into voltage signals that can be recognized by the controller 100, and the voltage signals output from the respective second level shift circuits constitute the range reading signal.
As shown in fig. 7, a schematic diagram of a gear position detection module 500 provided by the present application is shown. The second level shift unit 501 provided by the present application includes three second level shift circuits, and the number of the second level shift circuits corresponds to the output end of the gear output latch module 300.
As an alternative implementation manner, respective input ends of the second level shift unit 501 are respectively connected to output ends of the gear output latch module 300. Specifically, each input terminal of the second level conversion unit 501 is connected to each decoding output terminal of the decimal count pulse distributor. The high level and the low level which form the fan operating range value are converted into voltage signals which can be received by the GPIO interface of the controller 100 through the second level conversion circuit, and the voltage signals output by the second level conversion circuits form range reading signals. The gear reading signal is fed back to the controller 100 through the GPIO interface, so that the rotation speed of which gear the two-wire direct current fan is currently at is sensed.
As an optional implementation manner, at least two temperature intervals are provided in the controller 100, and the number of the temperature intervals corresponds to the number of the switching circuits in the speed regulation execution module 400.
When the controller 100 detects that the temperature of the working environment of the two-wire direct current fan speed regulating device is in any temperature range, the controller 100 outputs a corresponding fan rotating speed gear control logic value, and the speed regulating execution module 400 controls the rotating speed of the two-wire direct current fan to be in a corresponding gear.
According to the above description, the control device of the two-wire dc fan provided in the present application reads the temperature value of the fan working environment through the controller 100, converts the temperature range into the fan speed gear control logic value, outputs the fan speed gear control logic value through the GPIO port of the controller 100, and transmits the fan speed gear control logic value to the gear output latch module 300 after passing through the level conversion module, where the fan working gear value output by the gear output latch module 300 enters the speed regulation execution module 400, and the speed of the fan is regulated through the speed regulation execution module 400.
To sum up, the control device of the two-wire dc fan provided by the present application can control the speed-adjusting execution module 400 according to the requirement through the controller 100, so as to realize real-time adjustment of the rotating speed of the fan. And, through the controlling means that this application provided, two-wire direct current fan does not receive the too sensitive change of temperature controller and frequently switches the rotational speed, has positive influence to the life of fan.
Furthermore, the control device provided by the application can also sense and store the current rotating speed gear of the fan. So that the controller 100 may intervene to adjust the fan speed.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that the following descriptions are provided for illustration and example only and not for the purpose of limiting the invention as defined by the appended claims: rather, the invention is intended to cover alternatives, modifications, substitutions, combinations and simplifications which may be equally effective without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A control apparatus for a two wire dc fan for controlling the rotational speed of the two wire dc fan, the apparatus comprising:
the first interface is used for being detachably connected with the power supply unit;
a second interface comprising two circuit connections for detachable connection with the electrical interface of the two-wire DC fan;
the controller is used for acquiring the temperature of the working environment of the two-wire direct current fan speed regulating device and outputting a corresponding fan rotating speed gear control logic value according to the temperature;
the first level conversion module is used for receiving the fan rotating speed gear control logic value and converting the fan rotating speed gear control logic value into an amplitude signal;
the gear output latching module is used for receiving the amplitude signal output by the first level conversion module, outputting a corresponding fan working gear value according to the amplitude signal and latching the fan working gear value;
the speed regulation execution module is used for receiving the fan working gear value and controlling the rotating speed of the fan according to the fan working gear value;
the speed regulation execution module comprises at least two switch circuits which are connected in parallel, the input ends of the switch circuits are commonly and electrically connected with the power supply unit, the output ends of the switch circuits are commonly and electrically connected with the electrical interfaces of the two-wire direct current fans, the voltage drops of the switch circuits are different, and one of the switch circuits is selected to be conducted according to the work gear value of the fan.
2. The control device of a two-wire DC fan according to claim 1,
the first level conversion module comprises a first level conversion circuit, and the first level conversion circuit is used for receiving a fan rotating speed gear control logic value sent by the controller and converting the fan rotating speed gear control logic value into an amplitude signal which can be identified by the gear output latch module.
3. The control device of a two-wire DC fan according to claim 2,
the fan rotating speed gear control logic value comprises a high level and a low level, and the first level conversion module converts the high level into an amplitude signal which can be identified by the gear output latch module.
4. The control device for a two-wire dc fan according to claim 3, wherein the controller includes a GPIO interface through which the fan speed step control logic value is output;
the high level in the fan rotating speed gear control logic value is 3.3V, and a 3.3V high level signal in the fan rotating speed gear control logic value is converted into a 12V amplitude signal through the first level conversion module.
5. The control device for a two wire dc fan according to claim 1, further comprising:
the gear detection module comprises a second level conversion unit and is used for receiving the fan working gear value output by the gear output latching module, converting the fan working gear value into a gear reading signal through the second level conversion unit, feeding the gear reading signal back to the controller, and identifying the current fan working gear value by the controller according to the gear reading signal.
6. The control device of a two-wire DC fan according to claim 5,
the gear output latching modules comprise output ends, the number of the output ends of the gear output latching modules corresponds to the number of the switching circuits, and the output ends of the gear output latching modules are respectively connected with the control ends of the switching circuits;
the output end of each gear output latch module respectively outputs a high level or a low level to form the working gear value of the fan, and when the output end of any gear output latch module outputs a high level, the switch circuit corresponding to the output end of the gear output latch module is started.
7. The control device of a two-wire DC fan according to claim 6,
the second level conversion unit comprises second level conversion circuits, the number of the second level conversion circuits corresponds to the number of the output ends of the gear output latch module, and the input ends of the second level conversion circuits are respectively connected with the output ends of the gear output latch module;
the second level conversion circuit is used for converting a high level and a low level which form the value of the working gear of the fan into voltage signals which can be identified by the controller, and the voltage signals output by the second level conversion circuits form the gear reading signal.
8. The control device of a two-wire DC fan according to claim 7,
the controller comprises a GPIO interface, the second level conversion circuit converts the high level and the low level which form the fan work gear value into voltage signals which can be received by the GPIO interface, and the gear reading signals are fed back to the controller through the GPIO interface.
9. The control device of a two-wire DC fan according to claim 6,
the speed regulation execution module comprises three switch circuits which are connected in parallel, wherein each switch circuit comprises a switch tube, and the control end of each switch tube is electrically connected with the output end of the gear output latch module;
the input end of each switching tube is connected with the power supply unit through diodes with different numbers;
and the output ends of the switching tubes are connected with the second interface together.
10. The control device of a two-wire DC fan according to claim 1,
the controller is provided with at least two temperature intervals, and the number of the temperature intervals corresponds to the number of the switching circuits in the speed regulation execution module;
when the controller detects that the temperature of the working environment of the two-wire direct current fan speed regulating device is in any temperature range, the controller outputs a corresponding fan rotating speed gear control logic value, and the speed regulating execution module controls the rotating speed of the two-wire direct current fan to be in a corresponding gear.
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| CN202210319136.3A CN114421833A (en) | 2022-03-29 | 2022-03-29 | Control device for two-wire DC fan |
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| CN202210319136.3A CN114421833A (en) | 2022-03-29 | 2022-03-29 | Control device for two-wire DC fan |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20220429 |