CN106253769B - DC fan motor control circuit and the control method for applying it - Google Patents
DC fan motor control circuit and the control method for applying it Download PDFInfo
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- CN106253769B CN106253769B CN201610645580.9A CN201610645580A CN106253769B CN 106253769 B CN106253769 B CN 106253769B CN 201610645580 A CN201610645580 A CN 201610645580A CN 106253769 B CN106253769 B CN 106253769B
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- duty ratio
- fan motor
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- pulse width
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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
- H02P7/285—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 controlling armature supply only
- H02P7/29—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 controlling armature supply only using pulse modulation
Abstract
The invention discloses a kind of DC fan motor control circuit and using its control method.Wherein, control circuit includes temperature detecting module, for detecting temperature relevant to the working speed of the DC fan motor, and formation temperature signal；Main control unit is connect with the temperature detecting module, the temperature signal exported for receiving the temperature detecting module, and the pulse width modulating signal of duty ratio is answered according to the temperature signal output phase；Voltage control module is electrically connected with the DC fan motor, for controlling the voltage of the DC fan motor according to the pulse width modulating signal duty ratio.It introduces pulse width modulating signal, and the duty ratio for controlling pulse width modulating signal changes according to the variation of temperature, to carry out high-precision adjusting by revolving speed of the pulse width modulating signal to DC fan motor.
Description
Technical field
The present invention relates to motor control technology field more particularly to a kind of DC fan motor control circuits and its controlling party
Method.
Background technique
DC fan motor control is simple, it is only necessary to which providing a certain size DC voltage can start.Frequently as end
It is widely used in many industries such as industrial automation, refrigeration.Such as controller radiator fan, the common control of this kind of motor
Mode include be powered starting control model, temperature switch control model and press gear speed regulating control mode.Wherein, be powered starting
It is simplest control mode, i.e., after starting controller, the DC voltage of a constant amplitude is just passed through to fan motor, makes motor
With constant rotational speed operating.It is to increase a switch on the basis of being powered starting for temperature switch control mode, according to
The turn-on and turn-off of temp control switch, when the temperature is too low, switch disconnect, and fan motor does not start, when temperature reaches setting
It when value, closes the switch, provides the DC voltage of a constant amplitude, starting fan to fan motor.Further, it is adjusted the speed by gear
Control model is that fan control system is divided into several different gears according to temperature, and each gear is corresponding to be provided to motor
The DC voltage of different amplitudes turns fan with difference in different temperatures section to control fan running in different revolving speeds
Speed operating.It can be to a certain extent according to operating condition to motor speed although being controlled by gear motor running speed
It being adjusted, but it is that one kind has a grade control, the levels of precision of motor speed control places one's entire reliance upon the division of temperature range,
Motor speed control accuracy is inadequate.
Summary of the invention
Based on this, it is necessary to provide a kind of higher DC fan motor control circuit of motor speed control accuracy and answer
With the control method of its DC fan motor.
A kind of DC fan motor control circuit that purpose provides, the control circuit include: to realize the present invention
Temperature detecting module for detecting temperature relevant to the working speed of the DC fan motor, and forms temperature
Spend signal；
Main control unit is connect with the temperature detecting module, for receiving the temperature letter of the temperature detecting module output
Number, and answer according to the temperature signal output phase pulse width modulating signal of duty ratio；
Voltage control module is electrically connected with the DC fan motor, for being accounted for according to the pulse width modulating signal
Voltage of the sky than controlling the DC fan motor.
It in one of the embodiments, include field-effect tube, the grid of the field-effect tube in the voltage control module
The main control unit is connected, the pulse width modulating signal that the main control unit is exported is as input signal, the field-effect
The drain electrode of pipe is suitable for being connected in series the DC fan motor, the source electrode ground connection of the field-effect tube.
The circuit in one of the embodiments, further include:
With the DC fan motor the load current detection module that connect of load motor in a device, for examining
Survey the load current of the load motor；
The load speed detection module connecting with the load motor, the load for detecting the load motor turn
Speed；And
The load current detection module and the load speed detection module are connect with the main control unit, the master
Unit is controlled according to the temperature signal, and/or, the load current and the load speed output phase answer the pulse of duty ratio wide
Spend modulated signal.
The main control unit answers the pulse of duty ratio wide according to the temperature signal output phase in one of the embodiments,
When spending modulated signal, the arteries and veins to be exported is calculated according to the size of the temperature in the temperature signal and the difference between preset temperature
The first duty ratio of bandwidth modulation signals is rushed, and exports the pulse width modulating signal of the first duty ratio；
The main control unit answers the pulse width tune of duty ratio according to the load current and the load speed output phase
When signal processed, the pulse width tune to be exported is calculated according to the size of the product between the load current and the load speed
Second duty ratio of signal processed, and export the pulse width modulating signal of the second duty ratio.
The main control unit exports the pulse width modulation letter by light-coupled isolation module in one of the embodiments,
Number give the voltage control module.
A kind of control method of DC fan motor based on the same inventive concept, the control method include following step
It is rapid:
Obtain temperature relevant to the working speed of the DC fan motor；
It is used to control the first duty of the pulse width modulating signal of the DC fan motor according to the temperature computation
Than；
The working speed of the DC fan motor is controlled using the pulse width modulating signal of first duty ratio.
The pulse for being used to control the DC fan motor according to the temperature computation in one of the embodiments,
First duty ratio of bandwidth modulation signals, comprising the following steps:
Calculate the difference between the temperature and preset temperature value；
The first duty ratio of the pulse width modulating signal of the DC fan motor is calculated according to the difference.
In one of the embodiments, using linear equation mode according to the difference between the temperature and preset temperature value
Calculate the first duty ratio for controlling the pulse width modulating signal of the DC fan motor, the temperature and preset temperature
Difference between value is a variable of the linear equation, and first duty ratio is another change of the linear equation
Amount.
It is further comprising the steps of in one of the embodiments:
Obtain the load current of load motor；
Obtain the load speed of load motor；
The pulse width for controlling the DC fan motor is calculated according to the load current and the load speed
Second duty ratio of modulated signal；
The working speed of the DC fan motor is controlled using the pulse width modulating signal of second duty ratio.
First duty ratio and second duty ratio are all larger than duty ratio minimum in one of the embodiments,
And respectively less than duty ratio peak.
It is described described for controlling according to the load current and load speed calculating in one of the embodiments,
Second duty ratio of the pulse width modulating signal of DC fan motor, comprising the following steps:
Calculate the product between the load current and the load speed；
The second duty ratio of the pulse width modulating signal is calculated according to the product；And
Second duty ratio increases with the increase of the product.
The beneficial effect comprise that a kind of DC fan motor control circuit provided by the invention, passes through temperature
Detection module detects temperature relevant to DC fan motor control, and the main control unit of control circuit is according to the temperature detected
The pwm signal with corresponding duty ratio is exported, finally by the duty ratio in voltage control module according to pwm signal to DC fan
The working speed of motor is controlled.Since the duty ratio of pulse width modulating signal can carry out essence according to temperature reference factor
It really adjusts, therefore, high-precision adjusting can be carried out by revolving speed of the pulse width modulating signal to DC fan motor.It is relatively traditional
To detecting that temperature carries out interval division in technology, and the control mode that DC fan motor is run under different stalls is controlled,
It realizes the stepless control controlled DC fan motor.
Detailed description of the invention
Fig. 1 is the control circuit structural representation of the DC fan motor of an embodiment；
Fig. 2 is the control circuit structural representation of the DC fan motor of another embodiment；
Fig. 3 is the control method flow chart of the DC fan motor of an embodiment；
Fig. 4 is the implementation procedure schematic diagram controlled according to controller internal temperature DC fan motor；
Fig. 5 is the implementation procedure schematic diagram controlled according to load current and load speed DC fan motor.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to of the invention
The specific embodiment of DC fan motor control circuit, the control method of DC fan motor and control device is illustrated.
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Referring to Fig. 1, the DC fan motor control circuit of one of embodiment, including temperature detecting module 001, master control
Unit 002 and voltage control module 003.
The temperature detecting module 001 for detecting temperature relevant to the working speed of DC fan motor, and is formed
Temperature signal.The temperature relevant to the working speed of DC fan motor includes being provided with inside the device of DC fan
Temperature and environment temperature etc..Specific temperature detected is different according to DC fan working environment and purposes and difference.
Such as controller, setting mainly plays heat spreading function in control DC fan therein, at this point, temperature detecting module
Need to detect the temperature inside controller.Specifically, the load motor operation power in controller is bigger, inside controller
Temperature can be higher, correspondingly, the DC fan for playing heat spreading function needs to run at higher rotational speeds, i.e., temperature is higher, according to
The operating power of the testing result of temperature detecting module, DC fan motor can be bigger.
Similar, when DC fan, which is applied to industrial motor, to radiate, temperature detecting module needs to detect industrial electro
Temperature around motivation is controlled according to running speed of the temperature detected to DC fan motor.General industry is electronic
Temperature around machine is higher, and the revolving speed of DC fan motor is higher.
And the temperature inspection when DC fan is applied to be used as refrigerating fan in the equipment such as refrigerator, air-conditioning, in control circuit
Surveying module can detecte the reference temperature of the temperature and outdoor environment temperature of refrigerator inside as control DC fan motor revolving speed
When degree namely DC fan are as refrigerating fan, the temperature relevant to the working speed of DC fan motor can be outer
Boundary's environment temperature.
It and may include one or two temperatures above sensors and relevant connection electricity in the temperature detecting module
Road.In product setting assembling process, where sensor is installed to DC fan on the predeterminated position of device.And each sensing
Device passes through connecting line and connect with main control unit, and the temperature signal that will test is transferred to main control unit 002.
Referring to Fig. 1, main control unit 002 in control circuit is connect with temperature detecting module 001.It can receive temperature
Detection module 001 export temperature signal, and according to temperature signal output phase answer duty ratio pulse width modulate (PWM,
Pulse Width Modulation) signal.And the temperature that the temperature sensor in temperature detecting module detects is higher, output
Pulse width modulating signal duty ratio it is bigger.But the duty of the pulse width modulating signal of specific main control unit output
Than that can be calculated according to preset calculation formula and calculation method.The mode that duty ratio is controlled according to temperature linearity such as can be used
Pulse-width modulated signal is exported.When including more than two temperature sensors in temperature detecting module, to different positions
When setting carry out temperature detection, and obtaining multiple temperature signals, main control unit 002 can be according to the calculation procedure that prestores by multiple temperature
Signal carries out comprehensive analysis, and obtains the pulse width modulating signal of corresponding duty ratio.
Chip microcontroller can be used for the main control unit 002 in the control circuit of the present embodiment, and it is defeated according to temperature signal
The function of pulse width modulating signal out.
Further, the final control to DC fan motor of the present embodiment is realized by voltage control module 003.It is described
Voltage control module is connect with DC fan motor, receives the pulse width modulating signal that main control unit 002 exports, and according to arteries and veins
The voltage for rushing the width control DC fan motor both ends of bandwidth modulation signals, reaches control DC fan motor and DC fan
The purpose of revolving speed.
The DC fan motor control circuit of the present embodiment, the temperature that main control unit 002 is detected according to temperature detecting module
The pulse width modulating signal of signal production different duty.And DC fan motor is controlled by pulse width modulating signal
The voltage at both ends achievees the purpose that control rotating speed of DC fan.It is using pulse width modulating signal to DC fan
The revolving speed of motor is controlled, due to the duty ratio of pulse width modulating signal can according to need or according to reference data into
Row is accurate to be adjusted, and therefore, can carry out high-precision adjusting by revolving speed of the pulse width modulating signal to DC fan motor.Relatively
To detecting that temperature carries out interval division in traditional technology, and the controlling party that DC fan motor is run under different stalls is controlled
Formula realizes the stepless control controlled DC fan motor, and motor speed transformation is gentle, and external condition followability is more preferably.It keeps away
Exempt from that DC fan motor is unnecessary to run at high speed (when external temperature is lower, operation at higher voltages), it is energy saving.
Specifically, circuit structure realization shown in FIG. 1 can be used in voltage control module 003 in one of the embodiments,.
It uses a field-effect tube MOSFET to control as voltage of the switching tube to DC fan motor both ends.As shown in Figure 1,
The grid of field-effect tube MOSFET connects main control unit 002, and the pulse width modulating signal that main control unit 002 is exported is as defeated
Enter signal, the grid voltage of field-effect tube MOSFET is controlled.The drain electrode connection DC fan electricity of field-effect tube MOSFET
Machine, source electrode ground connection, so that field-effect tube MOSFET and DC fan motor be made to be connected in series.So after connection, main control unit
Driving signal of the pulse width modulating signal of output as field-effect tube, when controlling the turn-on and turn-off of field-effect tube MOSFET
Between, so that the voltage at DC fan motor both ends be adjusted.
In addition, the stability in order to guarantee circuit, as shown in Figure 1, main control unit 002 and voltage control module 003 it
Between be provided with light-coupled isolation module 004, the pwm signal that main control unit 002 exports passes through light-coupled isolation module 004MOSFET conduct
The driving signal of field-effect tube, and then control the turn-on and turn-off time of field-effect tube MOSFET.Specifically, as shown in Figure 1, straight
Flow fan motor one end connects 48V DC power supply, and the other end is connect with FET drain, the light in light-coupled isolation module 004
Sensing unit is connected between DC power supply and the grid of field-effect tube MOSFET.
In addition to the temperature detecting module 001 in previous embodiment, as shown in Fig. 2, in the direct current wind of wherein one embodiment
It fans in circuit for controlling motor, is additionally provided with load current detection module 005 and load speed detection module 006, load current inspection
It surveys module and load speed detection module is connect with main control unit 002.Wherein, the load current detection module 005 with it is straight
Flow fan motor load motor connection in a device, for where detecting DC fan or DC fan motor
The load current of load motor in device.Load speed detection module 006 also with DC fan motor in a device
Load motor connection, for detecting the load speed of load motor.
It should be noted that for the load motor load speed detection can directly by the circuit of tachometric survey,
Device is realized, is such as measured by load speed of the Hall sensor to load motor, it is related to revolving speed can also to lead to detection
Parameter obtain the load speed of load motor.The load speed is that the load of load speed detection module detection is electronic
The current actual rotation speed of machine.
In the control circuit of the present embodiment, be arranged load current detection module 005 and load speed detection module 006 it
Afterwards, main control unit 002 can be calculated when the duty ratio for carrying out pulse width modulating signal is calculated according to temperature signal,
It can also determine that the pulse width of output modulates letter in conjunction with the load current and load speed of load motor, comprehensive three parameters
Number duty ratio.Or main control unit 002 can also be answered only according to the load current and load speed output phase of load motor
The pulse width modulating signal of duty ratio.
As an embodiment, main control unit 002 answers the pulse width tune of duty ratio according to temperature signal output phase
When signal processed, a preset temperature value can be stored in the memory module in main control unit 002 in advance, main control unit is carrying out
When the duty ratio of pwm signal calculates, corresponding temperature is extracted from the temperature signal received, and calculate the temperature extracted
The size of difference between degree and preset temperature, the size calculating pulse to be exported further according to the difference of calculated temperature are wide
The first duty ratio of modulated signal is spent, and exports the pulse width modulating signal of the first duty ratio.And in the difference according to temperature
Size carry out pwm signal the first duty ratio calculate when, the mode of linear equation (linear equation in two unknowns) can be used, by temperature
Difference as a variable, the first duty ratio is as another variable, to calculate corresponding PWM according to the difference of temperature
First duty ratio of signal.At this point, the first duty ratio of pwm signal increases with the increase of the difference of temperature.
Correspondingly, main control unit 002 answers the pulse width of duty ratio to modulate according to load current and load speed output phase
When signal, the of the pwm signal to be exported can also be calculated according to the size of the product between load current and load speed
Two duty ratios, and export the pulse width modulating signal of the second duty ratio.And linear equation (linear equation in two unknowns) can also be used
Mode, by wind using the product of load current and load speed as a variable, using the second duty ratio of pwm signal as one
A variable, to calculate the second duty ratio of pwm signal according to the product of load current and load speed.At this point, pwm signal
Second duty ratio increases with the increase of the product of load current and load speed.
Based on above-mentioned DC fan motor control circuit, the present invention also provides a kind of controlling parties of DC fan motor
Method.It controls the operation of DC fan motor using the DC fan motor control circuit of aforementioned any embodiment.Such as
Shown in Fig. 3, the control method of one of embodiment the DC fan motor in controller is controlled the following steps are included:
S100 obtains temperature relevant to the working speed of DC fan motor.
As previously mentioned, the acquisition of temperature can be realized by the temperature sensor in temperature detecting module.As obtained in controller
The reference temperature for taking the temperature inside controller to control as DC fan motor.
S200 is used to control the first duty ratio of the pulse width modulating signal of DC fan motor according to temperature computation.
The relationship between temperature detected in the first duty ratio and temperature detecting module in this step can be public according to calculating
Formula is calculated.Linear equation in two unknowns between temperature and the first duty ratio or binary quadratic equation can such as be constructed according to temperature
Degree solves the first duty ratio.And general first duty ratio increases with the raising of temperature.
S300 utilizes the working speed of the pulse width modulating signal control DC fan motor of the first duty ratio.
As a kind of control mode, the first duty ratio is bigger, and the operating voltage at DC fan motor both ends is bigger, direct current wind
The working speed for fanning motor is also faster.
The control method of the DC fan motor of the present embodiment introduces pulse width modulating signal to DC fan motor
Working speed is controlled, and so as to be accurately controlled the duty ratio of pulse width modulating signal by the temperature detected, is reached
To the purpose of the working speed of accurate control DC fan motor.Keep the revolving speed control accuracy of DC fan motor higher.And
Control mode is simple.
As an embodiment, the calculating in step S200 for the first duty ratio, the temperature that calculating can be detected
Difference between degree and preset temperature value is as reference variable, the first difference between calculating temperature and preset temperature value, then root
The first duty ratio of the pulse width modulating signal to be exported is calculated according to the difference.Such as controller, as shown in figure 4, setting
The temperature that controller can be operated normally without auxiliary heat dissipation (it is auxiliary heat dissipation that DC fan, which opens heat dissipation), i.e. preset temperature value
For T2.It is T1, the difference between the temperature T1 and preset temperature value T2 of detection that temperature detecting module, which detects the temperature inside controller,
Value is △ T, if △ T > 0, the first duty ratio of pwm signal is calculated according to the size of difference, and in the pwm signal
The lower starting DC fan motor of control is run under certain working speed.And work as T≤0 △, then it is started without direct current wind at this time
Fan radiates, and controlling the first duty ratio at this time is 0, and DC fan does not start.
Wherein, as an embodiment, when △ T > 0, control to the first duty ratio, using the side of linear equation
Formula calculates the pulse width for controlling DC fan motor according to the difference △ T between temperature and preset temperature value and modulates letter
Number the first duty ratio.Certainly, the difference between temperature and preset temperature value is a variable of linear equation, the first duty ratio
For another variable of linear equation, so as to calculate the first duty ratio according to difference △ T.First duty ratio and temperature
One-to-one relationship when difference △ T, each different temperature gap △ T have first duty ratio.And different
The voltage at DC fan motor both ends is different under the pulse width modulating signal of first duty ratio, and motor working speed is different.From
And in the present embodiment, it is possible to realize the stepless speed regulation of DC fan motor according to different detection temperature, control precision is higher.
It is further comprising the steps of in the control method of the DC fan motor of another embodiment:
S101 obtains the load current of load motor.
S102 obtains the load speed of load motor.
It should be noted that there is no strict sequence between step S101 and step S102, can first carry out any one
It is a, it can also carry out simultaneously.The control method of the present embodiment and the control method of previous embodiment can be written in a manner of program
Into the main control unit of control circuit.The starting of DC fan motor and working voltage are controlled by step by main control unit
System.
S200 ' calculates the pulse width for controlling DC fan motor according to load current and load speed and modulates letter
Number the second duty ratio.
As an embodiment, this step can be divided into step performed below: firstly, computational load electric current and load turn
Then product between speed calculates the second duty ratio of pulse width modulating signal further according to product.And general second duty ratio
Increase with the increase of product.
S300 ' controls the working speed of the DC fan motor using the pulse width modulating signal of the second duty ratio.
Specifically, the step is that the pulse of main control unit the second duty ratio of output is wide in conjunction with DC fan motor control circuit above-mentioned
Spend modulated signal to the concatenated field-effect tube of DC fan, the turn-on and turn-off time of field-effect tube is controlled, to reach control
The purpose of the working speed of DC fan motor processed.
The control method of the present embodiment introduces the load current and load speed of load motor, thus even if temperature
Detection module breaks down, also can be electronic by loading when cannot detect controller internal temperature or other associated temperatures
The working condition of machine controls the operation of DC fan motor.
One specific embodiment is as shown in figure 5, obtain the load of the load current I and load motor of load motor
Revolving speed V, the product I*V between computational load electric current I and load speed V, judge whether product I*V is greater than default product value ξ, such as
Fruit is that the second duty ratio of pwm signal is then calculated according to product, starting DC fan motor operation, and DC fan motor
Running speed is corresponding with the second duty ratio of pwm signal；If it is not, then determining that load motor does not run or run power mistake
Low not need to carry out the auxiliary operation such as radiate, at this point, the duty ratio of control pwm signal is 0, DC fan does not start.
Similar, as an embodiment, the duty ratio of the form calculus pwm signal of linear equation can also be used,
Second duty ratio of pwm signal linearly increases with the increase of the product between load current I and load speed V.
It should also be noted that, in other embodiments, what main control unit can also be detected with combination temperature detection module
Temperature, three factors of load speed that the load current and load speed module that load current detection module detects detect
The duty ratio of the pwm signal of output is calculated.The mode that quaternary linear function can such as be directlyed adopt, using each factor as
One variable directly solves duty ratio.
To prevent the brownout motor at DC fan motor both ends from can not start, in one of the embodiments, to
The minimum value of one duty ratio and the second duty ratio is defined, when the duty ratio of pwm signal reaches duty ratio minimum, control
The duty ratio of pwm signal is no longer reduced with the reduction of temperature, load current and load speed, but directly output duty cycle is
0 pwm signal keeps output duty cycle for the pwm signal of duty ratio minimum value, i.e. the first duty ratio and the second duty ratio
It is all larger than or is equal to duty ratio minimum value.Correspondingly, the duty ratio of pwm signal is excessively high in order to prevent burns DC fan electricity
Machine also limits the duty ratio upper limit of output pwm signal, limit the first duty ratio and the second duty ratio be respectively less than or
Equal to duty ratio peak.When output duty cycle reaches largest duty cycle value, the duty ratio of pwm signal is controlled no longer with temperature
Degree, load current and load speed increase and increase, it is constant to keep it in largest duty cycle value.Wherein duty ratio peak
It can be calculated according to physical circuit parameter with duty ratio minimum, control circuit and specific DC fan motor determine it
Afterwards, the feasible section of the duty ratio of pwm signal [duty ratio minimum, duty ratio peak] is i.e. it has been determined that control unit will control
The duty ratio of pwm signal changes in this section, is realized by the variation of duty ratio to DC fan motor working speed
Adjustment.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. a kind of DC fan motor control circuit, which is characterized in that the control circuit includes:
Temperature detecting module, for detecting temperature relevant to the working speed of the DC fan motor, and formation temperature is believed
Number；
Main control unit is connect with the temperature detecting module, for receiving the temperature signal of the temperature detecting module output, and
The pulse width modulating signal of duty ratio is answered according to the temperature signal output phase；
Voltage control module is electrically connected with the DC fan motor, for according to the pulse width modulating signal duty ratio
Control the voltage of the DC fan motor；
With the DC fan motor the load current detection module that connect of load motor in a device, for detecting
State the load current of load motor；
The load speed detection module being connect with the load motor, for detecting the load speed of the load motor；
And
The load current detection module and the load speed detection module are connect with the main control unit, the master control list
Member answers the pulse width of duty ratio to modulate letter according to the temperature signal or the load current and the load speed output phase
Number；
The main control unit answers the pulse width of duty ratio to modulate letter according to the load current and the load speed output phase
Number when, according to the size of the product between the load current and the load speed calculate to be exported pulse width modulation letter
Number the second duty ratio, and export the second duty ratio pulse width modulating signal.
2. DC fan motor control circuit according to claim 1, which is characterized in that wrapped in the voltage control module
Field-effect tube is included, the grid of the field-effect tube connects the main control unit, the pulse width tune that the main control unit is exported
For signal processed as input signal, the drain electrode of the field-effect tube is suitable for being connected in series the DC fan motor, the field effect
Should pipe source electrode ground connection.
3. a kind of DC fan motor control circuit, which is characterized in that the control circuit includes:
Temperature detecting module, for detecting temperature relevant to the working speed of the DC fan motor, and formation temperature is believed
Number；
Main control unit is connect with the temperature detecting module, for receiving the temperature signal of the temperature detecting module output, and
The pulse width modulating signal of duty ratio is answered according to the temperature signal output phase；
Voltage control module is electrically connected with the DC fan motor, for according to the pulse width modulating signal duty ratio
Control the voltage of the DC fan motor；
With the DC fan motor the load current detection module that connect of load motor in a device, for detecting
State the load current of load motor；
The load speed detection module being connect with the load motor, for detecting the load speed of the load motor；
And
The load current detection module and the load speed detection module are connect with the main control unit, the master control list
Member answers the pulse width of duty ratio to modulate letter according to the temperature signal and the load current and the load speed output phase
Number.
4. DC fan motor control circuit according to claim 1, which is characterized in that the main control unit is according to
When temperature signal output phase answers the pulse width modulating signal of duty ratio, according to the temperature and preset temperature in the temperature signal
Between difference size calculate the pulse width modulating signal to be exported the first duty ratio, and export the first duty ratio arteries and veins
Rush bandwidth modulation signals.
5. DC fan motor control circuit according to claim 1, which is characterized in that the main control unit passes through optocoupler
Isolation module exports the pulse width modulating signal to the voltage control module.
6. a kind of control method of DC fan motor, which is characterized in that the control method the following steps are included:
Obtain temperature relevant to the working speed of the DC fan motor；
It is used to control the first duty ratio of the pulse width modulating signal of the DC fan motor according to the temperature computation；
The working speed of the DC fan motor is controlled using the pulse width modulating signal of first duty ratio；
Obtain the load current of load motor；
Obtain the load speed of load motor；
Calculate the product between the load current and the load speed；
The second duty ratio of the pulse width modulating signal is calculated according to the product；And
Second duty ratio increases with the increase of the product；
The working speed of the DC fan motor is controlled using the pulse width modulating signal of second duty ratio.
7. control method according to claim 6, which is characterized in that described described for controlling according to the temperature computation
First duty ratio of the pulse width modulating signal of DC fan motor, comprising the following steps:
Calculate the difference between the temperature and preset temperature value；
The first duty ratio of the pulse width modulating signal of the DC fan motor is calculated according to the difference.
8. control method according to claim 7, which is characterized in that using linear equation mode according to the temperature and in advance
If the difference between temperature value calculates the first duty ratio for controlling the pulse width modulating signal of the DC fan motor,
Difference between the temperature and preset temperature value is a variable of the linear equation, and first duty ratio is the line
Another variable of property equation.
9. control method according to claim 6, which is characterized in that first duty ratio and second duty ratio are equal
Greater than duty ratio minimum, and respectively less than duty ratio peak.
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