CN105634350B - The control circuit of DC brushless motor - Google Patents
The control circuit of DC brushless motor Download PDFInfo
- Publication number
- CN105634350B CN105634350B CN201610178484.8A CN201610178484A CN105634350B CN 105634350 B CN105634350 B CN 105634350B CN 201610178484 A CN201610178484 A CN 201610178484A CN 105634350 B CN105634350 B CN 105634350B
- Authority
- CN
- China
- Prior art keywords
- triode
- resistance
- coupled
- voltage
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005669 field effect Effects 0.000 claims abstract description 53
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
The present invention provides a kind of control circuit for DC brushless motor, including：Field effect transistor switch pipe, source electrode are coupled to the first end of power voltage terminal and resistance, and grid is coupled to the second end of the resistance, and drain electrode is coupled to the DC brushless motor to provide it control voltage；First triode, base stage are coupled to the input terminal of control signal, and emitter is grounded via coupling resistance, and collector is coupled to the second end of the resistance；Second triode, emitter are connect with the emitter of first triode, and collector is coupled to the power voltage terminal；And sample circuit, it inputs the control voltage for being coupled to the drain electrode of the field effect transistor switch pipe to sample control circuit output, output is coupled to the base stage of second triode to form the feedback closed loop of the control voltage, so as to which the size for making output control voltage locks the size of the control signal for the base stage for being input to first triode with predetermined multiplying power.
Description
Technical field
The present invention relates to Motor Control Field more particularly to the control circuits of DC brushless motor.
Background technology
Fig. 1 shows the schematic diagram of the brush DC aerofoil fan control circuit of the prior art.The control circuit uses field
Effect pipe Q16 is as output control element.When field-effect tube Q16 cut-offs, triode Q21 conductings, supply voltage+24V_1 leads to
It crosses Q21, R140~R148 and is loaded into fan both ends (P209-1, P209-3), fan work electric current is on resistance R140~R148
Generate pressure drop so that the voltage at fan both ends declines, and achievees the purpose that decompression speed.When field-effect tube Q16 is connected, due to
Q16 conduction voltage drops are about in the level of 0.05V, so supply voltage+24V_1 almost all is loaded into fan both ends, reach at a high speed
Speed governing purpose.
Fig. 2 shows the schematic diagrams of another brush DC aerofoil fan control circuit of the prior art.The circuit employs
Field-effect tube Q13, pliotron Q27 are as output control element；Q13 is connected in series with Q27.Field-effect tube Q13 is used as and " opens
Close " control pipe, only when Q13 is connected, fan both ends (P413-1, P413-3) is possible to obtain operating voltage.Three pole of power
The function of pipe Q27 is to control the speed of fan, and circuit state is " emitter follower "；When port QA11-1 applies " low electricity
It is flat ", then port QA11-5 opens a way, and Q13 cut-offs, fan stops；When port QA11-1 applies " high level ", then port QA11-5 is led
It is logical, Q13 conductings, fan running.Under conditions of Q13 conductings, when port QA11-3 applies " low level ", then port QA11-4 is opened
Road, supply voltage 24V_M are loaded into fan both ends by Q13, Q27, and fan work is in " high speed " state.In the item of Q13 conductings
Under part, when port QA11-3 applies " high level ", then port QA11-4 is connected, zener diode CR12 reverse breakdowns, Q27-B electricity
Pressure determines that the value is about 11V, and Q27-E pole tensions are about 10.3V at this time so that fan work is " low by CR12 (Vz=11V)
Speed " state.
The shortcomings that above two control circuit, first consists in circuit state and there was only 3：Stopping, Half Speed and high speed, and need
Two-way control port realizes these three states.Secondly, by taking control circuit shown in FIG. 1 as an example, the Q16 in direct high-speed starting
In have peak value be more than 3A dash current, as shown in Figure 3；By taking control circuit shown in Fig. 2 as an example, output voltage is in " high speed "
When, the triode Q27 for being operated in " emitter follower " state is unable to reach saturation conduction, i.e. supply voltage 24V_M can not be complete
Portion is applied to the both ends of fan.
Therefore, a kind of improved control program is desired.
Invention content
A brief summary of one or more aspects is given below to provide to the basic comprehension in terms of these.This general introduction is not
The extensive overview of all aspects contemplated, and be both not intended to identify critical or decisive element in all aspects also non-
Attempt to define the range in terms of any or all.Its unique purpose is to provide the one of one or more aspects in simplified form
A little concepts are with the sequence for more detailed description given later.
The object of the present invention is to provide a kind of control circuits of DC brushless motor.
According to an aspect of the present invention, a kind of control circuit for DC brushless motor is provided, including：
Field effect transistor switch pipe, the source electrode of the field effect transistor switch pipe are coupled to the first of power voltage terminal and resistance
End, grid are coupled to the second end of the resistance, and drain electrode is coupled to the DC brushless motor to provide it control voltage, should
The rotating speed of DC brushless motor with the control voltage size linear change；
First triode, the base stage of first triode are coupled to the input terminal of control signal, and emitter is via coupling electricity
Resistance ground connection, collector is coupled to the second end of the resistance, to control the field-effect via the voltage drop on the resistance
The turn-on deadline state of switching tube；
Second triode, the emitter of second triode are connect with the emitter of first triode with via the coupling
Resistance eutral grounding, collector are coupled to the power voltage terminal；And
Sample circuit, it is defeated to sample the control circuit that the input of the sample circuit is coupled to the drain electrode of the field effect transistor switch pipe
The control voltage gone out, output is coupled to the base stage of second triode to form the feedback closed loop of the control voltage, so as to make
The size of output control voltage is input to the size of the control signal of the base stage of first triode with the locking of predetermined multiplying power, with
It realizes and the continuously linear of the rotating speed of the DC brushless motor is controlled.
In one example, first triode and second triode be integrated as difference triode it is discrete
Element.
In one example, which includes the first divider resistance and the second divider resistance of series connection, first partial pressure
The first end of resistance is coupled to the drain electrode of the field effect transistor switch pipe, second end and the second partial pressure electricity as the input of sample circuit
The first end of resistance, which is connected, is coupled to the base stage of second triode using the output as sample circuit, and the of second divider resistance
Two ends are grounded, and the intrinsic standoff ratio of wherein first divider resistance and second divider resistance is determined by the predetermined multiplying power.
In one example, the predetermined multiplying power is more than or equal to the rated value of supply voltage and the maximum value of the control signal
Than.
In one example, the both ends of first divider resistance are parallel with ripple voltage inhibition capacitance.
In one example, the magnitude relationship of the resistance and the coupling resistance is configured such that leads in first triode
The voltage drop that the electric current of the resistance generates on the resistance is flowed through under logical state to be enough to lead the field effect transistor switch pipe
It is logical.
In one example, the collector of first triode is coupled to the second end of the resistance by current-limiting resistance,
The pressure drop that the magnitude relationship of the current-limiting resistance and the resistance is configured such that on the resistance is opened no more than the field-effect
Close maximum allowable source-gate voltage of pipe.
In one example, the base stage of first triode couples the input terminal of the control signal by RC integrating circuit,
In the RC integrating circuit include being coupled in integrating resistor between the base stage of first triode and the input terminal of the control signal
And it is coupled in the integrating capacitor between the base stage of first triode and ground terminal.
In one example, the field effect transistor switch pipe for P-channel field-effect transistor (PEFT) switching tube and first triode and this second
Triode is NPN triode.
In one example, the DC brushless motor be for the motor of brush DC aerofoil fan, the control circuit by with
It is controlled in the rotating speed of the brush DC aerofoil fan.
On the one hand scheme according to the present invention is realized in the continuously linear control of motor rather than traditional scheme
There are open and close and middling speed third gear.In addition, the solution of the present invention only needs single ended input, control circuit resource is saved.And
And the solution of the present invention eliminates the influence of the large inrush current of switch tube, ensure that circuit works more stable and reliablely.
Description of the drawings
After the detailed description of embodiment of the disclosure is read in conjunction with the following drawings, it better understood when the present invention's
Features described above and advantage.In the accompanying drawings, each component is not necessarily drawn to scale, and with similar correlation properties or feature
Component may have same or similar reference numeral.
Fig. 1 shows the schematic diagram of the brush DC aerofoil fan control circuit of the prior art；
Fig. 2 shows the schematic diagrams of another brush DC aerofoil fan control circuit of the prior art；
Fig. 3 shows the reality of dash current of the control circuit according to prior art Fig. 1 schemes in direct high-speed starting
Border test chart；
Fig. 4 shows the schematic diagram of the control circuit of DC brushless motor according to an aspect of the present invention；
Fig. 5 shows control circuit according to an embodiment of the invention inrush current and startup in Vin=1.0V
The actual test figure of time；
Fig. 6 shows control circuit according to an embodiment of the invention inrush current and startup in Vin=2.0V
The actual test figure of time；And
Fig. 7 shows control circuit according to an embodiment of the invention inrush current and startup in Vin=3.3V
The actual test figure of time.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.It is note that below in conjunction with attached drawing and specifically real
The aspects for applying example description is only exemplary, and is understood not to carry out any restrictions to protection scope of the present invention.
Fig. 4 shows the schematic diagram of the control circuit of DC brushless motor M according to an aspect of the present invention.As typical case
Application, DC brushless motor here can be the fan electromotor of the brush DC aerofoil fan applied to printer field.
As shown in the figure, DC brushless motor (hereinafter referred motor) M can have there are three port, port 3 is grounded, and port 2 is defeated
Go out abnormal operation alarm signal, port 1 receives the control voltage exported from control circuit.The rotating speed of motor M can be with control
The size of voltage processed is directly proportional, therefore, can be by realizing the control of motor M rotating speeds to controlling the control of the size of voltage.
In integrated circuit, the amplitude of cmos circuit control output Vin is generally no greater than 3.3V, however using for motor M is electric
It presses range that can be more than 20V, therefore, it is necessary to introduce additional+24V supply voltages VCC to provide the control voltage of motor M, and leads to
The control signal Vin of cmos circuit output is crossed to control the control voltage that can finally be provided to motor M.
As shown in figure 4, the control signal Vin input terminals of A points circuit in order to control, the output terminal of B points circuit in order to control.
As shown in figure 4, control circuit includes difference triode QA1 and field effect transistor switch pipe Q1.Field effect transistor switch pipe Q1's
Source electrode is coupled to the first end of power voltage terminal VCC and resistance R3, and grid is coupled to the second end of resistance R3, leakage
Pole is coupled to the port 1 of DC brushless motor to provide it control voltage as the output terminal of entire control circuit.As schemed
Show, field effect transistor switch pipe Q1 here can be P-channel field-effect transistor (PEFT) switching tube.
Field effect transistor switch pipe Q1 plays the role of switch between output terminal B and power voltage terminal VCC, works as field effect transistor switch
When pipe Q1 ends, the voltage of output terminal B is 0, then motor M stops.With being gradually turned on for field effect transistor switch pipe Q1, output terminal B
Voltage gradually increase, until field effect transistor switch pipe Q1 saturation conductions, the voltage of output terminal B no better than supply voltage VCC, from
And make motor M full-speed operations.
The turn-on deadline situation of field effect transistor switch pipe Q1 across the source of source electrode and grid-gate voltage drop by determining that i.e. coupling is electric
The pressure drop hindered on R3 determines.The size of load current depending on field effect transistor switch pipe Q1 makes field effect transistor switch pipe Q1 that institute be connected
The source needed-gate voltage is dropped generally in 2-2.5V or so.
As shown in the figure, difference triode QA1 is made of two symmetrically arranged triodes, it is for convenience, left in figure
The triode of side is referred to as the first triode, and the triode on right side is referred to as the second triode.Resistance R3 and the one or three pole
Pipe is connected, i.e., the emitter of the first triode is grounded via coupling resistance R4, and collector is coupled to resistance via resistance R2
The second end of R3, base stage are coupled to the input terminal Vin of control signal.Discrete difference triode is used herein, it is true
On can also use two independent triodes.The work between two triodes can only be made using discrete difference triode
Make environment such as temperature more closely, so as to better stability.
The emitter of the emitter of second triode and the first triode connects together to be grounded via coupling resistance R4, current collection
Pole is coupled to power voltage terminal VCC.
Control circuit further includes the sample circuit being made of the first divider resistance R5 and the second divider resistance R6.Sample circuit
Input terminal be coupled to the drain electrode of field effect transistor switch pipe Q1 namely the output terminal B of control circuit exports with sampling control circuit
Control voltage.The output of sample circuit is coupled to the base stage of the second triode to form the feedback closed loop of control voltage.With this side
Formula so that the size of output control voltage is input to the big of the control signal of the base stage of the first triode with the locking of predetermined multiplying power
It is small.
Specifically, the first divider resistance R5 and the second divider resistance R6 be connected in series the output terminal B of control circuit with
Between ground terminal GND, so as to play the role of partial pressure, wherein input of the first end of the first divider resistance R5 as sample circuit
It is coupled to the drain electrode of field effect transistor switch pipe Q1, second end is connected with the first end of the second divider resistance R6 using as sample circuit
Output is coupled to the base stage of the second triode, the second end ground connection of the second divider resistance.
In Fig. 4 under shown circuit configuration, due to the second divider resistance R6 first ends voltage close loop feed back to
The base stage of two triodes, the voltage of the second divider resistance R6 first ends are locked to the voltage of the base stage of the first triode, change
Yan Zhi passes through closed-loop control so that and the voltage of the second divider resistance R6 first ends follows the voltage of the first transistor base always,
As explained below.
In addition, since the voltage of output terminal B and the voltage of the second divider resistance R6 first ends are (that is, feed back to the two or three pole
The voltage of the base stage of pipe) there is fixed intrinsic standoff ratio, so control circuit output terminal is exported to the control voltage of motor M and first
The base voltage (i.e. Vin) of triode keeps scheduled multiplying power relationship, for example, exporting to the control voltage of motor M and the one or three
The multiplying power of the base voltage of pole pipe is equal to (R5+R6)/R6, it is seen that the multiplying power is related with the intrinsic standoff ratio of bleeder circuit.
From the foregoing, it will be observed that by continuously linear adjusting the Vin for being input to the first transistor base, control circuit can be realized
The control voltage swing of final output continuously adjusts, and is adjusted so as to fulfill the continuously linear of motor M rotating speeds.
The principle of closed loop feedback control described above is introduced briefly below.
Signal input Vin is controlled from CMOS control outputs, so generally less than 3.3V.If wishing, motor M stops, defeated
Enter Vin and be less than 0.3V, the first triode is in cut-off state at this time, and no electric current flows through on resistance R3 at this time, therefore presses
0 is reduced to, field effect transistor switch pipe Q1 ends at this time, and the control voltage output of output terminal B is 0, and motor M stops.
If wishing, motor M is operated, and firstly the need of the first triode ON is made, that is, Vin is allowed to be more than leading for the first triode
Logical threshold value.Generally in order to remove the unstable state of the first triode, when opening the first triode, the starting voltage of Vin will
Conduction threshold than the first triode is larger, such as using 0.8V as starting voltage.I.e. to motor M is made to work, then input is big
In the control signal Vin of 0.8V, and the rotating speed of motor M is controlled by adjusting the size of Vin.
When Vin is starting voltage 0.8V, the first triode is begun to turn on, and generates electric current on resistance R4 and R3, the electric current
Pressure drop is generated on resistance R3.The magnitude relationship of resistance R3 and coupling resistance R4 can be configured such that the one or three
The voltage drop that the electric current of resistance R3 generates on resistance R3 is flowed through under pole pipe conducting state to be enough to make field effect transistor switch
Pipe Q1 is connected.
For example, the load current depending on field effect transistor switch pipe Q1, source-grid voltage when being linearly connected is reduced to 2~2.5V.
The field effect transistor switch pipe Q1 of model as shown in Figure 4 can be turned it on when source-grid voltage drop is up to 2V.With the R4=shown in Fig. 4
Minimum current on 4.7k, R3 is about 20uA, therefore R3 is 100k ohm, you can reaches the turn-on condition of switching tube Q1.
Once field effect transistor switch pipe Q1 is begun to turn on, then the voltage raising of output terminal B points, correspondingly the second transistor base
On voltage raising so that the second triode ON.Due to flowing through the electric current of resistance R4 by the first triode and the second triode
The two shunts, so, as the second triode ON degree becomes larger, the electric current for flowing through R3 reduces to inhibit field effect transistor switch pipe Q1
Conducting.
Voltage on second transistor base can't finally be more than the voltage of the first transistor base although increase,
Because the conducting degree of field effect transistor switch pipe Q1 can be caused further to weaken so as in turn again by second if further increase
The voltage of transistor base is pulled back, and the final voltage for causing the second transistor base is equal with the voltage of the first transistor base,
Realize the locking of the voltage of the second transistor base to the voltage of the first transistor base.Again due to output terminal B outputs
The voltage of control voltage and the second transistor base has scheduled multiplying power relationship, it is achieved that the control of control circuit final output
The linear linkage of voltage and Vin processed.By the variation for controlling Vin, you can control to LINEAR CONTINUOUS the change of the control voltage of motor M
Change.
Usually, the maximum of rated value and control signal Vin that above-mentioned predetermined multiplying power can be more than or equal to supply voltage VCC
The ratio of value.By supply voltage VCC for for 24V, Vin maximums, then can be by setting the intrinsic standoff ratio of R5 and R6 will up to 3.3V
The predetermined multiplying power is set as 24/3=8.Such as R5=33k ohm, R6=4.7k ohm in Fig. 4.I.e. when Vin linearly increases 3V
When, the control voltage of output terminal B points is also linearly increased close to 24V.
When Vin is gradually increased to be more than 3V again, such as 3.1V, since supply voltage VCC is 24V, output terminal B's
Voltage is not above 24V, so the voltage of the second transistor base will not be higher than 3V, so that the second triode can not be after
Continuous to balance the electric current increased in the first triode, until the first triode saturation conduction, field effect transistor switch pipe Q1 also lead by saturation
Logical, as a result the voltage of output terminal B is locked on 24V, realizes the full speed running of motor M.
Usually, in order to ensure field effect transistor switch pipe Q1 does not damage ring by excessive voltage, the maximum of source-grid voltage drop can be provided
Permissible value.In this case, it is possible to a current limliting is set between the collector of the first triode and the second end of resistance R3
Resistance R2, to limit the pressure drop on R3.Such as to the pressure drop on R3 is made to be no more than 12V, then it is also 100k ohm that can enable R2.
In addition, C2 can be connected in parallel with a capacitor at the first divider resistance R5 both ends.Capacitance C2 increases the anti-of AC compounent
Present the voltage ripple so as to inhibit output terminal.
As previously described, start moment in conventional control circuit, the impact larger to field effect transistor switch pipe Q1 can be generated
Electric current.This is because a shunt capacitance C3 (as shown in Figure 4) in parallel is often understood at motor M both ends, to meet motor stabilizing
The technology requirement of operation.Since the terminal voltage of capacitance C3 rises rapidly, a great charging current is generated, to field-effect
Switching tube Q1 generates impact.
In order to inhibit this shock effect, RC integrating circuit can be set between the base stage of Vin and the first triode, even if
Vin is input to the base stage of the first triode via RC integrating circuit.Specifically, RC integrating circuit include being coupled in the one or three pole
Integrating resistor R1 between the base stage of pipe and the input terminal Vin for controlling signal and base stage and the ground connection for being coupled in the first triode
Hold the integrating capacitor C1 between GND.
Due to the effect of integrating circuit, the voltage of the first transistor base is made slowly to increase, so that being exported when starting
The conducting of field effect transistor switch pipe Q1 is slow enough.The slow degree is by depending on the value of integrating resistor R1 and integrating circuit C1
Time constant controls.In general, this slowing down for response speed of switch can be ignored using effect, it will not be apparent
Feel the delay of motor M operatings, but the influence for dash current can but substantially reduce.
Another effect of RC integrating circuit is that can receive pulse width modulates (PWM) signal as Vin, because of RC
Integrating circuit can detect the DC component of PWM.
Brush DC aerofoil fan control circuit is a base control circuit in duplicator printer product, below with
Brush DC aerofoil fan is briefly explained as a specific embodiment of motor M.
Brush DC aerofoil fan control circuit is a base control circuit in duplicator printer product.Fan control
The principle of system is to reduce the running speed of fan, to reduce " noise ", section as much as possible under the premise of " heat dissipation " requirement is met
The energy is saved, extends the service life of fan.
The basic demand of fan control circuitry is：1) reliable operation；2) meet items of the fan manufacturer to control circuit
Technology requirement；3) there is " good control performance "；4) less circuit control resource is occupied；5) relatively low component cost.
The present embodiment has met above-mentioned requirements well.
Without " inrush current " in output semiconductor switch element Q1.R-C integrations are formed using resistance R1 and capacitance C1
Device so that the conducting that field-effect tube Q1 is exported during startup is slow enough, and impact is formed in capacitance C3 (100 μ F) so as to inhibit
Electric current.
Using " difference triode " QA1, the temperature for improving the present embodiment circuit is stablized as amplification, sampling feedback element
Property.
Work as input voltage vin<During 0.3V, the Q1 cut-offs of output field-effect tube, output voltage=0V, fan stops, entire electric
Road complete switches off, No leakage electric current, meets " shutdown " conditions dictate of perfect switch.
Work as input voltage vin>During 3.1V, field-effect tube Q1 saturation conductions are exported, according to the electric parameter of Q1, electric conduction
It hinders in 500m Ω hereinafter, pressure drop when thus calculating Q1 in saturation conduction is in the level of 0.1V, meets the " closed " of perfect switch
Conditions dictate.
Since this control circuit only used single input terminal, meet the characteristic for occupying minimum circuit control resource.
Work as 0.8V<Vin<During 3.0V, circuit is in pipe collector on the left of linear speed regulating section, " difference triode " QA1
Current value range (determines) between 20~25 μ A by the Vgs parameters of Q1, VR3=2~2.5V, Q1 are operated in linear zone, fan speed
Degree is continuously adjustable.
In the case where having used RC integrating circuit, pwm signal can be used to be inputted as control, such as in the present embodiment
In, the pulse frequency selected value of PWM：F=2kHz.Following table 1 shows that under different input conditions actual test obtains
As a result, wherein supply voltage VCC=24.6V.
Table 1
Wherein：
PWM (%)：With the duty ratio input value of pulse width modulation, pulse amplitude 3.3V, unit：%；
Vin(V)：With the equivalent one that D/A analog quantitys or pwm pulse width modulation mode input, unit：Volt；
Vout(V)：The voltage at fan both ends, unit：Volt；
Ip(mA)：Peak point current in fet switch Q1, unit：Milliampere；
Irms(mA)：Real effective electric current in fet switch Q1, unit：Milliampere；
REV(rpm)：The rotating speed of fan, unit：Rev/min.
As can be seen from the above table by the way that the LINEAR CONTINUOUS of signal is controlled to input, effect is adjusted to the continuously linear of rotation speed of the fan
Fruit.
Following table 2 shows that input starts voltage, starting current and the actual test result for starting time relationship.
Table 2
| Vin(V) | I inrush(mA) | T start(mS) |
| 1.00 | 90 | 320 |
| 2.00 | 172 | 230 |
| 3.30 | 250 | 190 |
Wherein：
Vin(V)：With the equivalent one that D/A analog quantitys or pwm pulse width modulation mode input, unit：Volt；
I inrush(mA)：The dash current of field-effect tube Q1, unit are flowed through during starting fan：Milliampere；
T start(mS)：Start the time；Unit：Millisecond.
Therefore, it can be seen that dash current greatly reduces, but for fan delayed impact for actual use
It is negligible.
Fig. 5, Fig. 6 and Fig. 7 show actual test knot of the inrush current with starting the time under different startup voltages
Fruit.
Scheme according to the present invention is realized first in the LINEAR CONTINUOUS adjusting of motor speed rather than traditional scheme
Only open and close and middling speed third gear.In addition, the solution of the present invention only needs single ended input, control circuit money is saved
Source.And the solution of the present invention eliminates the influence of the large inrush current of switch tube, ensure that circuit more stable and reliable ground work
Make.
Offer is for so that any person skilled in the art all can make or use this public affairs to the previous description of the disclosure
It opens.The various modifications of the disclosure all will be apparent, and as defined herein general for a person skilled in the art
Suitable principle can be applied to spirit or scope of other variants without departing from the disclosure.The disclosure is not intended to be limited as a result,
Due to example described herein and design, but should be awarded and principle disclosed herein and novel features phase one
The widest scope of cause.
Claims (10)
1. a kind of control circuit for DC brushless motor, including：
Field effect transistor switch pipe, the source electrode of the field effect transistor switch pipe are coupled to the first end of power voltage terminal and resistance,
Grid is coupled to the second end of the resistance, and drain electrode is coupled to the DC brushless motor to provide it control voltage,
The rotating speed of the DC brushless motor is with the size linear change for controlling voltage；
First triode, the base stage of first triode are coupled to the input terminal of control signal, and emitter is via coupling resistance
Ground connection, collector are coupled to the second end of the resistance, to control the field via the voltage drop on the resistance
The turn-on deadline state of effect switch pipe；
Second triode, the emitter of second triode are connect with the emitter of first triode with via the coupling
Resistance eutral grounding is closed, collector is coupled to the power voltage terminal；And
Sample circuit, the input of the sample circuit are coupled to the drain electrode of the field effect transistor switch pipe to sample the control circuit
The control voltage of output, output are coupled to the base stage of second triode and are closed with forming the feedback of the control voltage
Ring, so as to make it is described control voltage size with predetermined multiplying power locking be input to first triode base stage control signal
Size, to realize that the continuously linear to the rotating speed of the DC brushless motor controls.
2. control circuit as described in claim 1, which is characterized in that first triode and second triode are to make
The discrete component integrated for difference triode.
3. control circuit as described in claim 1, which is characterized in that the sample circuit includes the first divider resistance of series connection
With the second divider resistance, the first end of first divider resistance is coupled to the field effect transistor switch as the input of sample circuit
The drain electrode of pipe, second end is connected with the first end of second divider resistance is coupled to described using the output as sample circuit
The base stage of two triodes, the second end ground connection of second divider resistance, wherein first divider resistance and second point described
The intrinsic standoff ratio of piezoresistance is determined by the predetermined multiplying power.
4. control circuit as claimed in claim 3, which is characterized in that the predetermined multiplying power is more than or equal to the specified of supply voltage
The ratio of value and the maximum value of the control signal.
5. control circuit as claimed in claim 3, which is characterized in that the both ends of first divider resistance are parallel with voltage wave
Line inhibits capacitance.
6. control circuit as described in claim 1, which is characterized in that the size of the resistance and the coupling resistance is closed
System is configured such that flows through the electric current of the resistance on the resistance under the first triode ON state
The voltage drop of generation is enough the field effect transistor switch pipe is connected.
7. control circuit as described in claim 1, which is characterized in that the collector of first triode passes through current-limiting resistance
It is coupled to the second end of the resistance, the magnitude relationship of the current-limiting resistance and the resistance is configured such that described
Pressure drop on resistance is no more than maximum allowable source-gate voltage of the field effect transistor switch pipe.
8. control circuit as described in claim 1, which is characterized in that the base stage of first triode passes through RC integrating circuit
The input terminal of the control signal is coupled, wherein the RC integrating circuit include being coupled in base stage and the institute of first triode
It states the integrating resistor between the input terminal of control signal and is coupled between base stage and the ground terminal of first triode
Integrating capacitor.
9. control circuit as described in claim 1, which is characterized in that the field effect transistor switch pipe is switched for P-channel field-effect transistor (PEFT)
Pipe and first triode and second triode are NPN triode.
10. control circuit as described in claim 1, which is characterized in that the DC brushless motor is for brush DC axis
The motor of flow fan, the control circuit are used for the rotation speed of the fan control of the brush DC aerofoil fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610178484.8A CN105634350B (en) | 2016-03-25 | 2016-03-25 | The control circuit of DC brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610178484.8A CN105634350B (en) | 2016-03-25 | 2016-03-25 | The control circuit of DC brushless motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105634350A CN105634350A (en) | 2016-06-01 |
| CN105634350B true CN105634350B (en) | 2018-06-08 |
Family
ID=56048979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610178484.8A Expired - Fee Related CN105634350B (en) | 2016-03-25 | 2016-03-25 | The control circuit of DC brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105634350B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260594B (en) * | 2020-10-30 | 2022-04-08 | 珠海格力电器股份有限公司 | Brush direct current motor, drive control circuit thereof and air conditioner |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395955C (en) * | 2005-07-29 | 2008-06-18 | 鸿富锦精密工业（深圳）有限公司 | DC fan starting circuit |
| CN100471030C (en) * | 2006-03-01 | 2009-03-18 | 元山科技工业股份有限公司 | Brushless DC motor controlling circuit |
| CN204316393U (en) * | 2014-11-22 | 2015-05-06 | 成都智利达科技有限公司 | A kind of Direct Current Governor System based on double-closed-loop control |
| CN104393801B (en) * | 2014-11-24 | 2017-07-14 | 苏州科爱佳自动化科技有限公司 | A kind of brshless DC motor arrangements for speed regulation and speed regulating method |
| CN105142073A (en) * | 2015-09-23 | 2015-12-09 | 成都乐维斯科技有限公司 | Easily-manufactured audio power amplifier circuit with simple structure |
| CN205509906U (en) * | 2016-03-25 | 2016-08-24 | 上海富士施乐有限公司 | DC Brushless motor's control circuit |
-
2016
- 2016-03-25 CN CN201610178484.8A patent/CN105634350B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN105634350A (en) | 2016-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5933573A (en) | Method of controlling an electric motor and apparatus for carrying out the method | |
| KR100488528B1 (en) | Power supply device for motor | |
| US4472666A (en) | Brushless DC motor | |
| CN100377491C (en) | DC fan self-starting circuit | |
| JP2547553B2 (en) | Power supply current limiting device for DC motor and electric motor equipped with such limiting device | |
| US6943514B1 (en) | Motor control circuit for supplying a controllable driving current | |
| US7586276B2 (en) | Electronically commutated motor and method for controlling the same | |
| WO2018006769A1 (en) | Hysteresis power supply circuit | |
| US4055794A (en) | Base drive regulator | |
| CN102013802A (en) | BOOST circuit with short circuit protection function | |
| JPS61139299A (en) | Motor driving circuit | |
| CA2333290C (en) | Electronically commutated motor | |
| CN105634350B (en) | The control circuit of DC brushless motor | |
| CN205509906U (en) | DC Brushless motor's control circuit | |
| TWI483519B (en) | Control circuit for dynamically adjusting off time of power switch in power converter | |
| CN106788005A (en) | Delaying current control device | |
| CN110071679B (en) | Motor control circuit | |
| CN102570805A (en) | Buck converter | |
| CN206712693U (en) | Delaying current control device | |
| CN220286016U (en) | Fan control circuit, circuit board, fan and electronic equipment | |
| JP2847010B2 (en) | Transistor output circuit | |
| JP2002136108A (en) | Voltage-boosting circuit | |
| JP2000092830A (en) | Power supply circuit | |
| JPH0556633A (en) | Voltage stabilizer | |
| JPH0239196B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 200245, No. 46 South Valley Road, Minhang Economic Development Zone, Shanghai, Minhang District Patentee after: Fuji film business equipment (Shanghai) Co.,Ltd. Address before: 200245, No. 46 South Valley Road, Minhang Economic Development Zone, Shanghai, Minhang District Patentee before: FUJI XEROX(SHANGHAI) Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180608 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |