CN106224276B - A kind of speed adjusting module pulse width modulation closed control circuit - Google Patents
A kind of speed adjusting module pulse width modulation closed control circuit Download PDFInfo
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- CN106224276B CN106224276B CN201610740624.6A CN201610740624A CN106224276B CN 106224276 B CN106224276 B CN 106224276B CN 201610740624 A CN201610740624 A CN 201610740624A CN 106224276 B CN106224276 B CN 106224276B
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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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Abstract
The present invention provides a kind of speed adjusting module pulse widths to modulate closed control circuit, and speed adjusting module pulse width modulation closed control circuit includes: load, and the first end of load is connected to power supply VBAT, and second end is grounded by alignment circuit；Control circuit, control circuit output pulse width modulation (PWM) signal；The low-pass filter circuit being connect with control circuit output end, for pulse width modulation (PWM) signal to be converted to direct current signal and is exported；Differential amplifier circuit, differential amplifier circuit carries out amplifier to load both end voltage, and exports amplified signal；Amplified signal is compared by comparison circuit, comparison circuit with direct current signal, exports difference signal；Oscillator adjusts the duty ratio of the pwm signal of the output end output of oscillator according to difference signal；Alignment circuit, the output end of alignment circuit and the second end of load connect.The present invention carries out pulse width modulation control to speed adjusting module, keeps blower both end voltage still stable in mains voltage variations, stability contorting wind speed.
Description
Technical field
The present invention relates to technical field of circuit design, in particular to a kind of speed adjusting module pulse width modulation closed-loop control electricity
Road.
Background technique
Existing automotive air-conditioning system blower carries out fan speed regulation using speed adjusting module.Speed adjusting module generally uses pulse width
It modulates (PWM, Pulse Width Modulation) signal and carries out opened loop control.
The circuit diagram of existing speed adjusting module control circuit is referring to Fig. 1, wherein Q is speed adjusting module, control load blower.Control
Circuit output pulse width modulated pwm signal processed controls the on-off of triode U, and then controls the switch of speed adjusting module.Control electricity
Road to control the voltage at blower both ends, and then reaches control blower wind by the duty ratio of adjusting pulse width modulation (PWM) signal
The purpose of speed.The circuit of the prior art controls rotation speed of fan by the duty cycle adjustment of pulse width modulation (PWM), when power supply electricity
When buckling, blower wind speed also the unstable phenomenon of wind speed can occur with variation.
Summary of the invention
Technical problems to be solved of the embodiment of the present invention are to provide a kind of speed adjusting module pulse width modulation closed-loop control electricity
Road carries out pulse width modulation (PWM) control to speed adjusting module to realize, keeps wind speed still stable in voltage change.
In order to solve the above technical problems, the embodiment of the invention provides a kind of speed adjusting module pulse widths to modulate closed-loop control
Circuit, comprising:
Load, the first end of the load are connected to power supply VBAT, and second end is grounded by alignment circuit；
Control circuit, the control circuit output pulse width modulation (PWM) signal；
The low-pass filter circuit connecting with the control circuit output end is used for the pulse width modulation (PWM) signal
It is converted to direct current signal and exports；
Differential amplifier circuit, the non-inverting input terminal of the differential amplifier circuit are connected to power supply VBAT, the differential amplification
The inverting input terminal of circuit is connected to the second end of load, and the differential amplifier circuit carries out sampling to load both end voltage and puts
Greatly, and amplified signal is exported；
Comparison circuit, the homophase input of the comparison circuit terminate the direct current signal of the low-pass filter circuit output, institute
The anti-phase input for stating comparison circuit terminates the amplified signal of the differential amplifier circuit output；The comparison circuit is by the amplification
Signal is compared with the direct current signal, exports difference signal；
Oscillator, the voltage controling end of the oscillator connects the difference signal of the comparison circuit output, for according to institute
State difference signal adjust the oscillator output end output pwm signal duty ratio；
Alignment circuit, the input terminal of the alignment circuit are connect with the output end of the oscillator, the alignment circuit
Output end and the second end of load connect.
Further, the low-pass filter circuit includes: the 7th resistance and first capacitor, wherein the 7th resistance
First end is connected to the output end of the control circuit, and second end is electric with the non-inverting input terminal of the comparison circuit and first respectively
The first end of appearance connects, the second end ground connection of the first capacitor.
Further, the non-inverting input terminal of the differential amplifier circuit is connected to power supply VBAT via second resistance.
Further, the differential amplifier circuit includes: first resistor, 3rd resistor, the 4th resistance and the first amplifier,
Wherein, the first end of the second resistance is connect with the power supply VBAT, and the second end of the second resistance is respectively with described
The non-inverting input terminal of one amplifier is connected with the first end of 3rd resistor, and the first end of the 3rd resistor is also put with described first
The non-inverting input terminal connection of big device, the second end ground connection of the 3rd resistor, the first end of the first resistor respectively with it is described
The inverting input terminal of first amplifier is connected with the first end of the 4th resistance, and the second end of the first resistor and the load connect
It connecing, the first end of the 4th resistance is also connect with the inverting input terminal of first amplifier, and the second of the 4th resistance
End is connect with the output end of first amplifier, and first amplifier further includes first end and second end, and described first puts
The first end of big device is connect with the power supply VBAT, the second end ground connection of first amplifier.
Further, the inverting input terminal of the comparison circuit connects the differential amplifier circuit output via the 5th resistance
Amplified signal.
Further, the comparison circuit includes: the 6th resistance and the second amplifier, wherein the of the 5th resistance
One end is connect with the output end of the differential amplifier circuit, the second end of the 5th resistance and the reverse phase of second amplifier
Input terminal connection, the non-inverting input terminal of second amplifier are connect with the output end of the low-pass filter circuit, and described second
Amplifier further includes first end and second end, and the first end is connect with the power supply VBAT, second end ground connection, and described the
The first end of six resistance is connect with the output end of second amplifier, second end and the oscillator of the 6th resistance
Voltage controling end connection.
Further, further includes: the 7th resistance, the 8th resistance, the 9th resistance, the second capacitor and third capacitor, wherein institute
The 4th pin and the 8th pin for stating oscillator are connect with the first end of the power supply VBAT and the 7th resistance respectively, the oscillation
7th pin of device is connect with the first end of the second end of the 7th resistance and the 8th resistance respectively, and the of the 7th resistance
One end is also connect with the power supply VBAT, and the second end of the 7th resistance is also connect with the first end of the 8th resistance, institute
The 6th pin for stating oscillator connects with the first end of the second end of the 8th resistance, the output end of comparison circuit and the second capacitor respectively
Connect, the second pin of the oscillator respectively with the second end of the 8th resistance, the output end of comparison circuit and the second capacitor
One end connection, the first end of second capacitor are connect with the second end of the 8th resistance, the second end of second capacitor
It is connect respectively with the first pin of the second end of the third capacitor and the oscillator, the second termination of second capacitor
Ground, the first end of the third capacitor are connect with the 5th pin of the oscillator, the second end of the third capacitor also with institute
State the first pin connection of oscillator, the second end ground connection of the third capacitor, the first end and the vibration of the 9th resistance
The third pin connection of device is swung, the second end of the 9th resistance is connect with the input terminal of the alignment circuit.
Further, the alignment circuit includes: speed adjusting module, the tenth resistance and the 4th capacitor, wherein the speed regulation mould
The first end of block is connect with the oscillator, and the second end of the speed adjusting module is electric with the second end of the load and the tenth respectively
The first end of resistance connects, the third end ground connection of the speed adjusting module, the first end of the tenth resistance also with the load the
The connection of two ends, the second end of the tenth resistance respectively with the inverting input terminal of the differential amplifier circuit and the 4th capacitor the
One end connection, the first end of the 4th capacitor are also connect with the inverting input terminal of the differential amplifier circuit, the 4th electricity
The second end of appearance is grounded.
Further, the 5th resistance and the 6th resistance are current-limiting resistance.
Compared with prior art, a kind of speed adjusting module pulse width modulation closed-loop control electricity provided in an embodiment of the present invention
Road at least has the advantages that the speed adjusting module pulse width modulation closed control circuit of the embodiment of the present invention uses and closes
Ring carries out pulse width modulation (PWM) control to speed adjusting module, keeps blower both end voltage still stable in mains voltage variations, thus
Stability contorting wind speed.
Detailed description of the invention
Fig. 1 is the circuit diagram of speed adjusting module control circuit in the prior art；
Fig. 2 is that the speed adjusting module pulse width of the embodiment of the present invention modulates the circuit diagram of closed control circuit.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.In the following description, such as specific configuration is provided and the specific detail of component is only
In order to help comprehensive understanding the embodiment of the present invention.It therefore, it will be apparent to those skilled in the art that can be to reality described herein
Example is applied to make various changes and modifications without departing from scope and spirit of the present invention.In addition, for clarity and brevity, it is omitted pair
The description of known function and construction.
It should be understood that " one embodiment " or " embodiment " that specification is mentioned in the whole text mean it is related with embodiment
A particular feature, structure, or characteristic is included at least one embodiment of the present invention.Therefore, occur everywhere in the whole instruction
" in one embodiment " or " in one embodiment " not necessarily refer to identical embodiment.In addition, these specific features, knot
Structure or characteristic can combine in any suitable manner in one or more embodiments.
Referring to fig. 2, the embodiment of the invention provides a kind of speed adjusting module pulse widths to modulate closed control circuit, comprising:
Load, the first end of the load are connected to power supply VBAT, and second end is grounded by alignment circuit；
Control circuit, the control circuit output pulse width modulation (PWM) signal；
The low-pass filter circuit connecting with the control circuit output end is used for the pulse width modulation (PWM) signal
It is converted to direct current signal and exports；
Differential amplifier circuit, the non-inverting input terminal of the differential amplifier circuit are connected to power supply VBAT, the differential amplification
The inverting input terminal of circuit is connected to the second end of load, and the differential amplifier circuit carries out sampling to load both end voltage and puts
Greatly, and amplified signal is exported；
Comparison circuit, the homophase input of the comparison circuit terminate the direct current signal of the low-pass filter circuit output, institute
The anti-phase input for stating comparison circuit terminates the amplified signal of the differential amplifier circuit output；The comparison circuit is by the amplification
Signal is compared with the direct current signal, exports difference signal；
Oscillator U1, the voltage controling end of the oscillator U1 connect the difference signal of the comparison circuit output, are used for root
The duty ratio of the pwm signal of the output end output of the oscillator U1 is adjusted according to the difference signal；
Alignment circuit, the input terminal of the alignment circuit are connect with the output end of the oscillator U1, the alignment circuit
Output end and load second end connect.
The low-pass filter circuit includes: the 7th resistance R7 and first capacitor C1, wherein the first of the 7th resistance R7
End is connected to the output end of the control circuit, second end respectively with the non-inverting input terminal of the comparison circuit and first capacitor C1
First end connection, the first capacitor C1 second end ground connection.
The non-inverting input terminal of the differential amplifier circuit is connected to power supply VBAT via second resistance R2.
The differential amplifier circuit includes: first resistor R1,3rd resistor R3, the 4th resistance R4 and the first amplifier A1,
Wherein, the first end of the second resistance R2 is connect with the power supply VBAT, the second end of the second resistance R2 respectively with institute
The non-inverting input terminal for stating the first amplifier A1 is connected with the first end of 3rd resistor R3, the first end of the 3rd resistor R3 also with
The non-inverting input terminal of the first amplifier A1 connects, the second end ground connection of the 3rd resistor R3, the first resistor R1's
First end is connect with the first end of the inverting input terminal of the first amplifier A1 and the 4th resistance R4 respectively, the first resistor
The second end of R1 and the load connect, anti-phase input of the first end of the 4th resistance R4 also with the first amplifier A1
End connection, the second end of the 4th resistance R4 are connect with the output end of the first amplifier A1, the first amplifier A1
It further include first end and second end, the first end of the first amplifier A1 is connect with the power supply VBAT, first amplification
The second end of device A1 is grounded.
The inverting input terminal of the comparison circuit is believed via the amplification that the 5th resistance R5 connects the differential amplifier circuit output
Number.
The comparison circuit includes: the 6th resistance R6 and the second amplifier A2, wherein the first end of the 5th resistance R5
It is connect with the output end of the differential amplifier circuit, the reverse phase of the second end of the 5th resistance R5 and the second amplifier A2
Input terminal connection, the non-inverting input terminal of the second amplifier A2 connect with the output end of the low-pass filter circuit, and described the
Two amplifier A2 further include first end and second end, and the first end is connect with the power supply VBAT, the second end ground connection, institute
The first end for stating the 6th resistance R6 is connect with the output end of the second amplifier A2, the second end of the 6th resistance R6 and institute
State the voltage controling end connection of oscillator U1.
The speed adjusting module pulse width modulates closed control circuit further include: the 7th resistance R7, the 8th resistance R8, the 9th
Resistance R9, the second capacitor C2 and third capacitor C3, wherein the 4th pin (pin 4 i.e. in figure) of the oscillator U1 and
Eight pins (pin 8 i.e. in figure) are connect with the first end of the power supply VBAT and the 7th resistance R7 respectively, the oscillator U1
The 7th pin (pin 7 i.e. in figure) connect respectively with the second end of the 7th resistance R7 and the first end of the 8th resistance R8
Connect, the first end of the 7th resistance R7 is also connect with the power supply VBAT, the second end of the 7th resistance R7 also with it is described
The first end of 8th resistance R8 connects, the 6th pin (pin 6 i.e. in figure) of the oscillator U1 respectively with the 8th resistance R8
Second end, comparison circuit output end and the second capacitor C2 first end connection, the second pin of the oscillator U1 (schemes
In pin 2) connected respectively with the first end of the second end of the 8th resistance R8, the output end of comparison circuit and the second capacitor C2,
The first end of the second capacitor C2 is connect with the second end of the 8th resistance R8, the second end difference of the second capacitor C2
It is connect with the first pin (pin 1 i.e. in figure) of the second end of the third capacitor C3 and the oscillator U1, described second
The second end of capacitor C2 is grounded, the first end of the third capacitor C3 and the 5th pin (i.e. the drawing in figure of the oscillator U1
Foot 5) it connects, the second end of the third capacitor C3 is also connect with the first pin of the oscillator U1 (pin 1 i.e. in figure),
The second end of the third capacitor C3 is grounded, and the third pin of the first end of the 9th resistance R9 and the oscillator U1 are (i.e.
Pin 3 in figure) it connects, the second end of the 9th resistance R9 is connect with the input terminal of the alignment circuit.
The alignment circuit includes: speed adjusting module Q1, the tenth resistance R10 and the 4th capacitor C4, wherein the speed adjusting module
The first end of Q1 is connect with the oscillator U1, the second end of the speed adjusting module Q1 respectively with the second end of the load and
The first end of ten resistance R10 connects, the third end ground connection of the speed adjusting module Q1, the first end of the tenth resistance R10 also with
The second end of the load connects, the second end of the tenth resistance R10 anti-phase input with the differential amplifier circuit respectively
End is connected with the first end of the 4th capacitor C4, and the first end of the 4th capacitor C4 is also defeated with the reverse phase of the differential amplifier circuit
Enter end connection, the second end ground connection of the 4th capacitor C4.
The 5th resistance R5 and the 6th resistance R6 is current-limiting resistance.
As shown in Fig. 2, the embodiment of the present invention can use two operational amplifiers: the first amplifier A1, the second amplifier
A2 and oscillator U1 are as main logic unit.Q1 is speed adjusting module, control load, and load is wind in one implementation of the present invention
Machine, it is following using blower as object factory, by adjusting speed adjusting module Q1, and then blower both end voltage is controlled, controls blower
Revolving speed.
Control circuit output pulse width modulation (PWM) signal, the 7th resistance R7, first capacitor C1 form low-pass filtering electricity
Pulse width modulation (PWM) signal is converted into direct current signal by road.It can be defeated by changing pulse width modulation (PWM) duty ratio
Different DC level out, this DC level also will be as the reference voltage signals in following contrast circuits.
The homophase input of first amplifier A1 terminates supply voltage, and inverting input terminal is given a dinner for a visitor from afar machine by first resistor R1, the
One amplifier A1, first resistor R1,3rd resistor R3, the 4th resistance R4 formed differential amplifier circuit, to blower both end voltage into
Row amplifier.Amplified signal enters the comparison circuit being made of the second amplifier A2, the benchmark formed with control circuit
Voltage signal, i.e., above-mentioned direct current signal are compared.5th resistance R5 is current-limiting resistance.By the second amplifier A2 relatively after it is defeated
Difference signal out changes oscillator by the voltage controling end of the 6th resistance R6 output control oscillator U1 for current-limiting resistance
The duty ratio of the pulse width modulation (PWM) signal of U1 output end third pin (pin 3 i.e. in figure).
Wherein, oscillator U1 can be 555 oscillator of integrated form, and the embodiment of the present invention can be connect using its typical circuit
Method only controls voltage in its 6th pin of input terminal (pin 6 i.e. in figure), second pin (pin 2 i.e. in figure) access,
The duty ratio of output signal can be changed by changing control voltage.
When load blower both end voltage is excessively high, the first amplifier A1 output voltage is got higher, then the second amplifier A2 is exported
It is lower, oscillator U1 output duty cycle is lower, and blower both end voltage is lower；When load blower both end voltage is too low, first is put
Big device A1 output voltage is lower, then the second amplifier A2 output is got higher, and oscillator U1 output duty cycle is got higher, blower both end voltage
It gets higher.To achieve the purpose that automatically control blower both end voltage, stablize blower both end voltage, so that it is steady to control blower wind speed
It is fixed.
To sum up, the speed adjusting module pulse width modulation closed control circuit of the embodiment of the present invention is using closed loop to speed adjusting module
Pulse width modulation (PWM) control is carried out, keeps blower both end voltage still stable in mains voltage variations, thus stability contorting wind
Speed.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of speed adjusting module pulse width modulates closed control circuit characterized by comprising
Load, the first end of the load are connected to power supply VBAT, and second end is grounded by alignment circuit；
Control circuit, the control circuit output pulse width modulation (PWM) signal；
The low-pass filter circuit being connect with the control circuit output end, for converting the pulse width modulation (PWM) signal
For direct current signal and export；
Differential amplifier circuit, the non-inverting input terminal of the differential amplifier circuit are connected to power supply VBAT, the differential amplifier circuit
Inverting input terminal be connected to the second end of load, the differential amplifier circuit carries out amplifier to load both end voltage, and
Export amplified signal；
Comparison circuit, the homophase input of the comparison circuit terminate the direct current signal of the low-pass filter circuit output, the ratio
Compared with the amplified signal that the anti-phase input of circuit terminates the differential amplifier circuit output；The comparison circuit is by the amplified signal
It is compared with the direct current signal, exports difference signal；
Oscillator, the voltage controling end of the oscillator connects the difference signal of the comparison circuit output, for according to the difference
Value signal adjusts the duty ratio of the pwm signal of the output end output of the oscillator；
Alignment circuit, the input terminal of the alignment circuit are connect with the output end of the oscillator, the output of the alignment circuit
It holds and is connect with the second end of load；
Wherein, the alignment circuit includes a speed adjusting module, and the first end of the speed adjusting module is connect with the oscillator, described
The second end of speed adjusting module is connect with the second end of the load, the third end ground connection of the speed adjusting module；
The alignment circuit further include: the tenth resistance (R10) and the 4th capacitor (C4), wherein the second end of the speed adjusting module
Also connect with the first end of the tenth resistance (R10), the first end of the tenth resistance (R10) also with the load second
End connection, the second end of the tenth resistance (R10) respectively with the inverting input terminal of the differential amplifier circuit and the 4th capacitor
(C4) first end connection, the first end of the 4th capacitor (C4) also connect with the inverting input terminal of the differential amplifier circuit
It connects, the second end ground connection of the 4th capacitor (C4)；
Wherein, the speed adjusting module is metal-oxide-semiconductor.
2. speed adjusting module pulse width according to claim 1 modulates closed control circuit, which is characterized in that
The low-pass filter circuit includes: the 7th resistance (R7) and first capacitor (C1), wherein the of the 7th resistance (R7)
One end is connected to the output end of the control circuit, second end respectively with the non-inverting input terminal and first capacitor of the comparison circuit
(C1) first end connection, the second end ground connection of the first capacitor (C1).
3. speed adjusting module pulse width according to claim 1 modulates closed control circuit, which is characterized in that the difference
The non-inverting input terminal of amplifying circuit is connected to power supply VBAT via second resistance (R2).
4. speed adjusting module pulse width according to claim 3 modulates closed control circuit, which is characterized in that
The differential amplifier circuit includes: first resistor (R1), 3rd resistor (R3), the 4th resistance (R4) and the first amplifier
(A1), wherein the first end of the second resistance (R2) is connect with the power supply VBAT, the second end of the second resistance (R2)
It is connect respectively with the first end of the non-inverting input terminal of first amplifier (A1) and 3rd resistor (R3), the 3rd resistor
(R3) first end is also connect with the non-inverting input terminal of first amplifier (A1), the second termination of the 3rd resistor (R3)
Ground, the first end of the first resistor (R1) respectively with the inverting input terminal and the 4th resistance (R4) of first amplifier (A1)
First end connection, the second end of the first resistor (R1) and load connection, the first end of the 4th resistance (R4)
It is also connect with the inverting input terminal of first amplifier (A1), the second end of the 4th resistance (R4) and first amplification
The output end of device (A1) connects, and first amplifier (A1) further includes first end and second end, first amplifier (A1)
First end connect with the power supply VBAT, the second end of first amplifier (A1) ground connection.
5. speed adjusting module pulse width according to claim 1 modulates closed control circuit, which is characterized in that the comparison
The inverting input terminal of circuit connects the amplified signal of the differential amplifier circuit output via the 5th resistance (R5).
6. speed adjusting module pulse width according to claim 5 modulates closed control circuit, which is characterized in that
The comparison circuit includes: the 6th resistance (R6) and the second amplifier (A2), wherein the first of the 5th resistance (R5)
End is connect with the output end of the differential amplifier circuit, the second end of the 5th resistance (R5) and second amplifier (A2)
Inverting input terminal connection, the output end of the non-inverting input terminal of second amplifier (A2) and the low-pass filter circuit connects
It connecing, second amplifier (A2) further includes first end and second end, and the first end is connect with the power supply VBAT, and described
Two ends ground connection, the first end of the 6th resistance (R6) are connect with the output end of second amplifier (A2), the 6th electricity
The second end of resistance (R6) is connect with the voltage controling end of the oscillator.
7. speed adjusting module pulse width according to claim 1 modulates closed control circuit, which is characterized in that
Further include: the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9), the second capacitor (C2) and third capacitor (C3),
Wherein, the 4th pin of the oscillator and the 8th pin connect with the first end of the power supply VBAT and the 7th resistance (R7) respectively
It connects, the 7th pin of the oscillator connects with the second end of the 7th resistance (R7) and the first end of the 8th resistance (R8) respectively
Connect, the first end of the 7th resistance (R7) is also connect with the power supply VBAT, the second end of the 7th resistance (R7) also with
The first end of 8th resistance (R8) connects, the 6th pin of the oscillator respectively with the second end of the 8th resistance (R8),
The first end of the output end of comparison circuit and the second capacitor (C2) connection, the second pin of the oscillator respectively with the 8th resistance
(R8) connection of the first end of the output end of second end, comparison circuit and the second capacitor (C2), the of second capacitor (C2)
One end is connect with the second end of the 8th resistance (R8), the second end of second capacitor (C2) respectively with the third capacitor
(C3) second end is connected with the first pin of the oscillator, the second end ground connection of second capacitor (C2), the third
The first end of capacitor (C3) is connect with the 5th pin of the oscillator, the second end of the third capacitor (C3) also with the vibration
Swing the first pin connection of device, the second end ground connection of the third capacitor (C3), the first end of the 9th resistance (R9) and institute
The third pin connection of oscillator is stated, the second end of the 9th resistance (R9) is connect with the input terminal of the alignment circuit.
8. speed adjusting module pulse width according to claim 6 modulates closed control circuit, which is characterized in that the described 5th
Resistance (R5) and the 6th resistance (R6) are current-limiting resistance.
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| CN207229434U (en) * | 2017-05-09 | 2018-04-13 | 广州市浩洋电子股份有限公司 | A kind of fan rotary speed control system |
| CN112874260A (en) * | 2021-01-22 | 2021-06-01 | 湖北开特汽车电子电器系统股份有限公司 | Speed regulation method, storage medium, device and system of automobile air conditioner blower |
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| TWI498485B (en) * | 2013-03-18 | 2015-09-01 | Hon Hai Prec Ind Co Ltd | Fan driving circuit |
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| KR970010558B1 (en) * | 1993-12-29 | 1997-06-28 | 만도기계 주식회사 | Car air blower motor speed control circuit |
| CN201846296U (en) * | 2010-04-01 | 2011-05-25 | 台达电子工业股份有限公司 | Fan driving circuit capable of regulating speed automatically and power supplying circuit |
| CN101985946A (en) * | 2010-10-22 | 2011-03-16 | 北京星网锐捷网络技术有限公司 | Fan speed-regulation control circuit as well as control method and electronic device thereof |
| CN102996470A (en) * | 2012-10-23 | 2013-03-27 | 深圳市汇川技术股份有限公司 | AC (alternating current) fan fault detection circuit |
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| Publication number | Publication date |
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| CN106224276A (en) | 2016-12-14 |
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