CN106357169A - PWM modulation circuit and direct-current brushless motor controller - Google Patents
PWM modulation circuit and direct-current brushless motor controller Download PDFInfo
- Publication number
- CN106357169A CN106357169A CN201610917315.1A CN201610917315A CN106357169A CN 106357169 A CN106357169 A CN 106357169A CN 201610917315 A CN201610917315 A CN 201610917315A CN 106357169 A CN106357169 A CN 106357169A
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- comparator
- electrically connected
- reference voltage
- 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.)
- Pending
Links
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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Inverter Devices (AREA)
Abstract
The embodiment of the invention provides a PWM modulation circuit and a direct-current brushless motor controller. The PWM modulation circuit comprises a sawtooth wave generation module for generating a sawtooth wave, and a PWM velocity-regulating signal generation module which is connected with the sawtooth wave generation module to receive sawtooth waves and is used for generating a PWM velocity-regulating signal according to the sawtooth waves, wherein the duty cycle of the PWM velocity-regulating signal is adjustable. In the technical scheme provided by the embodiment, resistors, capacitors, operational amplifiers and other conventional devices with relatively low prices are adopted instead of single chip circuits which have relatively high prices and need programming, so that the manufacture cost of the PWM modulation circuit and the direct-current brushless motor controller can be effectively reduced.
Description
Technical field
The present embodiments relate to electric machines control technology technology, more particularly, to a kind of pwm modulation circuit and brush DC electricity
Machine controller.
Background technology
DC Brushless Motor speed governing is to adjust output by slide rheostat to realize electrodeless tune to motor vsp voltage
Speed, program low cost and reliability is higher.But the continuous lifting with DC motor speed-regulating demand, starts at present on the market
Now adopt the DC brushless motor of pwm dutycycle speed governing, existing host computer cannot meet demand.
At present, the DC brushless motor of pwm dutycycle speed governing commonly uses mode of speed regulation is using single-chip microcomputer and to carry out software volume
Cheng Shixian adjustable duty cycle exports, and the single-chip microcomputer in the program is expensive.Therefore, the defect existing for prior art is, pwm
Alignment circuit and DC brushless motor controller manufacturing cost are higher.
Content of the invention
The embodiment of the present invention proposes a kind of pwm modulation circuit and DC brushless motor controller, reduces pwm modulation with effective
Circuit and the manufacturing cost of DC brushless motor controller.
In a first aspect, embodiments providing a kind of pwm modulation circuit, comprising:
Sawtooth waveforms generation module, for generating sawtooth waveforms；
Pwm speed-regulating signal generation module, is connected with sawtooth waveforms generation module, receives sawtooth waveforms, for giving birth to according to sawtooth waveforms
Become pwm speed-regulating signal, the dutycycle of pwm speed-regulating signal is adjustable.
In above-mentioned pwm modulation circuit, alternatively, pwm speed-regulating signal generation module includes:
First comparator and the first reference voltage circuit, the first reference voltage circuit is used for providing the first reference voltage, the
The first input end of one comparator is electrically connected with the first reference voltage circuit, for receiving the first reference voltage, first comparator
The second input electrically connect with sawtooth waveforms generation module, for receiving sawtooth signal, first comparator is according to the first reference
The change of voltage exports the pwm speed-regulating signal of different duty.
In above-mentioned pwm modulation circuit, alternatively, the first reference voltage circuit includes:
Power supply and the first rheostat, the first end of the first rheostat and power electric connection, the first variable resistance
Second end ground connection of device, the first reference voltage described in the three-polar output of the first rheostat.
In above-mentioned pwm modulation circuit, alternatively, pwm speed-regulating signal generation module also includes: first resistor and the second electricity
Resistance, the first input end of first comparator is positive input terminal, and the first end of first resistor is electrically connected with the outfan of first comparator
Connect, the second end of first resistor is electrically connected with the first input end of first comparator, the first end of second resistance and first resistor
Second end electrical connection, the second end of second resistance is electrically connected with sawtooth waveforms generation module, for receiving sawtooth signal.
In above-mentioned pwm modulation circuit, alternatively, sawtooth waveforms generation module includes:
Second reference voltage circuit, the second comparator and integral operation circuit, the second reference voltage circuit is used for offer the
Two reference voltages, the first input end of the second comparator is electrically connected with the second reference voltage circuit, for receiving second with reference to electricity
Pressure, the second input of the second comparator electrically connect with the outfan of integral operation circuit, the outfan of the second comparator and amassing
Divide the input electrical connection of computing circuit, the outfan of integral operation circuit is electrically connected with pwm speed-regulating signal generation module, output
Described sawtooth waveforms.
In above-mentioned pwm modulation circuit, alternatively, sawtooth waveforms generation module also includes:
3rd resistor and the 4th resistance, the first input end of the second comparator is positive input terminal, the first end of 3rd resistor
Electrically connect with the first input end of the second comparator, the second end of 3rd resistor is electrically connected with the outfan of the second comparator；The
The first end of four resistance is electrically connected with the first end of 3rd resistor, and the second end of the 4th resistance and the second reference voltage circuit are electrically connected
Connect, for receiving the second reference voltage.
In above-mentioned pwm modulation circuit, alternatively, 3rd resistor and/or the 4th resistance are rheostat.
In above-mentioned pwm modulation circuit, alternatively, integral operation circuit includes: anti-phase integrator, anti-phase integrator bag
Include the first amplifier, the first electric capacity and the 5th resistance, the first end of the first electric capacity is electrically connected with the outfan of the first amplifier, the first electricity
The second end holding electrically connects with the inverting input of the first amplifier, the first end of the 5th resistance and the inverting input of the first amplifier
Electrical connection, the second end of the 5th resistance is electrically connected with the outfan of the second comparator, the in-phase input end of the first amplifier and second
Reference voltage circuit electrically connects, for receiving the second reference voltage, the outfan of the first amplifier and pwm speed-regulating signal generation module
Electrical connection, exports described sawtooth waveforms.
In above-mentioned pwm modulation circuit, alternatively, integral operation circuit includes: homophase integrating circuit, homophase integrating circuit bag
Include the second amplifier, the second electric capacity and the 6th resistance, the first end of the second electric capacity is electrically connected with the outfan of the second amplifier, the second electricity
The second end holding electrically connects with the inverting input of the second amplifier, the first end of the 6th resistance and the inverting input of the first amplifier
Electrical connection, the second end of the 6th resistance is electrically connected with the second reference voltage circuit, for receiving the second reference voltage, the second amplifier
In-phase input end electrically connect with the outfan of the second comparator, the outfan of the second amplifier and pwm speed-regulating signal generation module
Electrical connection, exports described sawtooth waveforms.
In above-mentioned pwm modulation circuit, alternatively, integral operation circuit includes: rc integrating circuit, rc integral operation circuit bag
Include the 3rd electric capacity and the 7th resistance, one end ground connection of the 3rd electric capacity, the other end is electrically connected with the first end of the 7th resistance, the 7th electricity
Second end of resistance is electrically connected with the outfan of the second comparator, and the first end of the 7th resistance is electric with pwm speed-regulating signal generation module
Connect, export described sawtooth waveforms.
In above-mentioned pwm modulation circuit, alternatively, the first capacitor's capacity and/or the 5th resistance scalable.
In above-mentioned pwm modulation circuit, alternatively, the second capacitor's capacity and/or the 6th resistance scalable.
In above-mentioned pwm modulation circuit, alternatively, the 3rd capacitor's capacity and/or the 7th resistance scalable.
Second aspect, embodiments provides a kind of DC brushless motor controller, modulates electricity including above-mentioned pwm
Road, also includes current rectifying and wave filtering circuit and Switching Power Supply, and current rectifying and wave filtering circuit is used for for AC rectification filtering becoming unidirectional current, carries
Busbar voltage for DC brushless motor and the voltage of Switching Power Supply, Switching Power Supply and current rectifying and wave filtering circuit and pwm modulation circuit
Connect, for providing DC voltage to pwm modulation circuit.
In technical scheme provided in an embodiment of the present invention, due to not adopting price higher and needing the monolithic programming dynamo-electric
Road is realized, but employs the conventional devices such as the relatively low resistance of price, electric capacity and amplifier, effectively reduce pwm modulation circuit and
The manufacturing cost of DC brushless motor controller.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to institute in embodiment of the present invention description
Need use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only the present invention some enforcement
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be implemented according to the present invention
The content of example and these accompanying drawings obtain other accompanying drawings.
Fig. 1 is the circuit diagram of the pwm modulation circuit that the embodiment of the present invention one provides；
Fig. 2 is the electricity of the pwm modulation circuit that the integral operation circuit that the embodiment of the present invention two provides is anti-phase integrator
Road schematic diagram；
Fig. 3 is the electricity of the pwm modulation circuit that the integral operation circuit that the embodiment of the present invention two provides is homophase integrating circuit
Road schematic diagram；
Fig. 4 is the circuit of the pwm modulation circuit that the integral operation circuit that the embodiment of the present invention two provides is rc integrating circuit
Schematic diagram；
Fig. 5 is the circuit diagram of the pwm modulation circuit that the embodiment of the present invention three provides；
Fig. 6 (a) is the u1o simulation waveform schematic diagram that the embodiment of the present invention three provides；
Fig. 6 (b) is the u2o simulation waveform schematic diagram that the embodiment of the present invention three provides；
Fig. 6 (c) is the u3o simulation waveform schematic diagram that the embodiment of the present invention three provides；
Fig. 7 is the DC brushless motor controller circuit diagram that the embodiment of the present invention four provides.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, in order to just
Part related to the present invention rather than entire infrastructure is illustrate only in description, accompanying drawing.
Embodiment one
Embodiments provide a kind of pwm modulation circuit, refer to Fig. 1, it is that the embodiment of the present invention one provides
A kind of pwm modulation circuit schematic diagram.
Present embodiments provide a kind of pwm modulation circuit, may include that sawtooth waveforms generation module 11, for generating sawtooth
Ripple；Pwm speed-regulating signal generation module 12, is connected with sawtooth waveforms generation module 11, receives sawtooth waveforms, for generating according to sawtooth waveforms
Pwm speed-regulating signal, the dutycycle of pwm speed-regulating signal is adjustable.
Specifically, sawtooth waveforms generation module can be made up of it is also possible to by d/a change-over circuit structure comparator and integrating circuit
Become, can also be made up of other circuit.Pwm speed-regulating signal generation module can be made up of comparator it is also possible to be compared by sluggishness
Device circuit is constituted, and can also be made up of other circuit.
Embodiment two
Embodiments provide three kinds of pwm modulation circuits, refer to Fig. 2, Fig. 3 and Fig. 4, it is the present invention respectively
The circuit diagram of three kinds of different pwm modulation circuits that embodiment two provides.
In above-mentioned pwm modulation circuit, alternatively, pwm speed-regulating signal generation module 12 may include that first comparator 122
With the first reference voltage circuit 121, the first reference voltage circuit 121 is used for providing the first reference voltage, first comparator 122
First input end is electrically connected with the first reference voltage circuit 121, for receiving the first reference voltage, the of first comparator 122
Two inputs are electrically connected with sawtooth waveforms generation module 11, and for receiving sawtooth signal, first comparator 122 is according to the first reference
The change of voltage exports the pwm speed-regulating signal of different duty.
Specifically, first comparator can be made up of amplifier, the first reference voltage circuit can be made up of resistance point
Volt circuit or the bleeder circuit being made up of rheostat.The first input end of first comparator can be in Fig. 2
The inverting input of amplifier u3 in the in-phase input end of amplifier u3 or Fig. 4.In the same manner, the second input of first comparator
End can be in-phase input end or the inverting input of amplifier u3.The in-phase input end of amplifier and inverting input can exchange,
Increased the motility of circuit design, decrease the generation of mistake design simultaneously.
In above-mentioned pwm modulation circuit, alternatively, the first reference voltage circuit 121 includes: power supply and the first rheostat
Rp1, the first end of the first rheostat rp1 and power electric connection, the second end ground connection of the first rheostat rp1, first
First reference voltage described in the three-polar output of rheostat rp1.Can be adjusted by adjusting the first rheostat rp1
The size of one reference voltage, and then reach the effect of adjustment pwm speed-regulating signal dutycycle.Rheostat is conventional device, valency
Lattice are cheap and have multiple encapsulation such as plug-in unit, paster available, the cost reducing pwm modulation circuit and the spirit that increased design
Activity.In above-mentioned pwm modulation circuit, alternatively, as shown in figure 3, pwm speed-regulating signal generation module 12 can also include: first
Resistance r9 and second resistance r8, the first input end of first comparator 122 is positive input terminal, the first end of first resistor r9 and the
The outfan electrical connection of one comparator 122, the second end of first resistor r9 and the first input end of first comparator 122 are electrically connected
Connect, the first end of second resistance r8 is electrically connected with the second end of first resistor, the second end of second resistance r8 is generated with sawtooth waveforms
Module electrically connects, for receiving sawtooth signal.Similarly, the second end of second resistance r8 can also be with the first reference voltage electricity
Road connects, for receiving the first reference voltage.Increased first resistor r9 and second resistance r8 so that comparator circuit introduces
Positive feedback, becomes hysteresis comparator, improves the interference free performance of circuit.
In above-mentioned pwm modulation circuit, alternatively, sawtooth waveforms generation module 11 may include that the second reference voltage circuit
111st, the second comparator 112 and integral operation circuit 113, the second reference voltage circuit 111 is used for providing the second reference voltage, the
The first input end of two comparators 112 is electrically connected with the second reference voltage circuit 111, for receiving the second reference voltage, second
Second input of comparator 112 is electrically connected with the outfan of integral operation circuit 113, the outfan of the second comparator 112 with
Input electrical connection, the outfan of integral operation circuit 113 and the pwm speed-regulating signal generation module 12 of integral operation circuit 113
Electrical connection, exports described sawtooth waveforms.
Specifically, the second reference voltage circuit can be made up of bleeder circuit.Integral operation circuit can be anti-phase integration
Circuit or homophase integrating circuit, can also be rc integrating circuit, can also be that rc integrating circuit is constituted together with amplifier
Integrating circuit and other integrating circuit.
Second comparator can be dissimilar according to above-mentioned integral operation circuit, chooses with phase comparator or anti-phase ratio
Compared with device.
Exemplary, with reference to Fig. 2, Fig. 2 is a kind of integral operation circuit that the present embodiment provides is anti-phase integrator
The circuit diagram of pwm modulation circuit.As seen from Figure 2, the second comparator is same phase comparator, the second comparator 112
Negative input end is electrically connected with the second reference voltage circuit 111, for receiving the second reference voltage, the second comparator 112 just defeated
Enter end to electrically connect with the outfan of anti-phase integrator 113, the outfan of the second comparator 112 and anti-phase integrator 113
Negative input end electrically connects, and the positive input terminal of anti-phase integrator 113 is electrically connected with the second reference voltage circuit 111, for receiving
Second reference voltage, the outfan of anti-phase integrator 113 is electrically connected with pwm speed-regulating signal generation module 12, exports described saw
Tooth ripple.
With reference to Fig. 3, Fig. 3 is that in a kind of pwm modulation circuit that the present embodiment provides, integral operation circuit is same phase integral electricity
The circuit diagram on road.As seen from Figure 3, the second comparator be anti-phase hysteresis comparator, can by amplifier u1, resistance r3 and
Resistance r5 is constituted, and the first end of resistance r3 is electrically connected with the positive input terminal of the second comparator, and second end of resistance r3 and second is compared
Outfan electrical connection compared with device；The first end of resistance r5 is electrically connected with the first end of resistance r3, second end and second of resistance r5
Reference voltage circuit 111 connects, for receiving the second reference voltage.The negative input end of the second comparator 112 is electric with phase integral
The outfan electrical connection on road 113, the outfan of the second comparator 112 is electrically connected with the positive input terminal of homophase integrating circuit 113, with
The negative input end of phase integral circuit 113 is electrically connected with the second reference voltage circuit 111, for receiving the second reference voltage, homophase
The outfan of integrating circuit 113 is electrically connected with pwm speed-regulating signal generation module 12, exports described sawtooth waveforms.
With reference to Fig. 4, Fig. 4 is that in the middle pwm modulation circuit that the present embodiment provides, integral operation circuit is rc integrating circuit
Circuit diagram.As seen from Figure 4, the second comparator is anti-phase comparator, the positive input terminal and second of the second comparator 112
Reference voltage circuit 111 electrically connects, for receiving the second reference voltage, the negative input end of the second comparator 112 and rc integration electricity
The outfan electrical connection on road 113, the outfan of the second comparator 112 is electrically connected with the input of rc integrating circuit 113, and rc integrates
The outfan of circuit 113 is electrically connected with pwm speed-regulating signal generation module 12, exports described sawtooth waveforms.
Second comparator and integral operation circuit are constituted by devices such as amplifier and resistance, and amplifier and resistance are general
Device, price is low to be easy to purchase, and reduces the production cost of pwm modulation circuit.
In above-mentioned pwm modulation circuit, alternatively, as shown in figure 3, sawtooth waveforms generation module 11 also includes: 3rd resistor r3
With the 4th resistance r5, the first input end of the second comparator 112 is positive input terminal, and the first end of 3rd resistor r3 compares with second
The first input end electrical connection of device, the second end of 3rd resistor r3 is electrically connected with the outfan of the second comparator；4th resistance r5
First end electrically connect with the first end of 3rd resistor r3, second end of the 4th resistance r5 and the second reference voltage circuit 111 are even
Connect, for receiving the second reference voltage.Similarly, second end of the 4th resistance r5 can also be defeated with integral operation circuit 113
Go out end electrical connection, the negative input end of the second comparator 112 is electrically connected with the second reference voltage circuit 111, for receiving the second ginseng
Examine voltage.Similarly, aforementioned circuit can also be increased in Fig. 2 and Fig. 4.Increased 3rd resistor r3 and the 4th resistance r5 so that
Comparator circuit introduces positive feedback, becomes hysteresis comparator, improves the interference free performance of circuit.
In above-mentioned pwm modulation circuit, alternatively, 3rd resistor and/or the 4th resistance can be rheostat.3rd electricity
Resistance, the 4th resistance or 3rd resistor and the 4th resistance can be rheostats, just can be adjusted by adjusting rheostat
The frequency of section sawtooth waveforms, increased the frequency-adjustable characteristic of pwm modulation circuit.
In above-mentioned pwm modulation circuit, alternatively, as shown in Fig. 2 integral operation circuit 123 may include that anti-phase integration electricity
Road, anti-phase integrator can include the first amplifier u2, the first electric capacity c1 and the 5th resistance r7, the first end of the first electric capacity c1 with
The outfan electrical connection of the first amplifier u2, second end of the first electric capacity c1 is electrically connected with the inverting input of the first amplifier u2, the
The first end of five resistance r7 is electrically connected with the inverting input of the first amplifier u1, second end of the 5th resistance r7 and the second comparator
112 outfan electrical connection, the in-phase input end of the first amplifier u2 is electrically connected with the second reference voltage circuit 111, for receiving
Second reference voltage, the outfan of the first amplifier u2 is electrically connected with pwm speed-regulating signal generation module 12, exports described sawtooth waveforms.
Integral operation circuit 123 can adopt anti-phase integrator, increased the motility of circuit design.
In above-mentioned pwm modulation circuit, alternatively, as shown in figure 3, integral operation circuit 123 may include that same phase integral electricity
Road, homophase integrating circuit includes the second amplifier u2, the second electric capacity c1 and the 6th resistance r7, the first end and second of the second electric capacity c1
The outfan electrical connection of amplifier u2, second end of the second electric capacity c1 is electrically connected with the inverting input of the second amplifier u2, the 6th electricity
The first end of resistance r7 is electrically connected with the inverting input of the first amplifier u2, and second end of the 6th resistance r7 is electric with the second reference voltage
Road 111 electrically connects, for receiving the second reference voltage, the output of the in-phase input end of the second amplifier u2 and the second comparator 112
End electrical connection, the outfan of the second amplifier u2 is electrically connected with pwm speed-regulating signal generation module 12, exports described sawtooth waveforms.Integration
Computing circuit 123 can adopt homophase integrating circuit, increased the motility of circuit design.
In above-mentioned pwm modulation circuit, alternatively, as shown in figure 4, integral operation circuit 123 may include that rc integration electricity
Road, rc integral operation circuit can include the 3rd electric capacity c1 and the 7th resistance r7, one end ground connection of the 3rd electric capacity c1, the other end with
The first end electrical connection of the 7th resistance r7, second end of the 7th resistance r7 is electrically connected with the outfan of the second comparator 112, and the 7th
The first end of resistance r7 is electrically connected with pwm speed-regulating signal generation module 12, exports described sawtooth waveforms.Integral operation circuit 123 can
Using rc integrating circuit, increased the motility of circuit design.
In above-mentioned pwm modulation circuit, alternatively, the first capacitor's capacity and/or the 5th resistance scalable.First electric capacity
The resistance of capacitance, the resistance of the 5th resistance or the capacitance of the first electric capacity and the 5th resistance can adjust, as variable
Electric capacity or variable resistance.The frequency of sawtooth waveforms just can be adjusted by adjusting variable resistance or variable capacitance, increased pwm modulation
The frequency-adjustable characteristic of circuit.
In above-mentioned pwm modulation circuit, alternatively, the second capacitor's capacity and/or the 6th resistance scalable.Second electric capacity
The resistance of capacitance, the resistance of the 6th resistance or the capacitance of the second electric capacity and the 6th resistance can adjust, as variable
Electric capacity or variable resistance.The frequency of sawtooth waveforms just can be adjusted by adjusting variable resistance or variable capacitance, increased pwm and adjust
The frequency-adjustable characteristic of circuit processed.
In above-mentioned pwm modulation circuit, alternatively, the 3rd capacitor's capacity and/or the 7th resistance scalable.3rd electric capacity
Capacitance, the resistance of the 7th resistance or the capacitance of the 3rd electric capacity and the resistance of the 7th resistance can adjust, as variable
Electric capacity or variable resistance.The frequency of sawtooth waveforms just can be adjusted by adjusting variable resistance or variable capacitance, increased pwm modulation
The frequency-adjustable characteristic of circuit.
Embodiment three
On the basis of foregoing invention embodiment, embodiments provide a kind of pwm modulation circuit, refer to Fig. 5,
It is a kind of pwm modulation circuit schematic diagram that the embodiment of the present invention three provides.Compared with Fig. 2, increased resistance r3, r4, r5 and
r6.Wherein, r3, r5 constitute homophase hysteresis comparator together with the second comparator, and r6 is pull-up resistor.r1、r2、r3、r5、r7、
In c1, any one or more values is variable, to realize adjusting the purpose of output sawtooth wave frequency.Its principle is as follows:
With regard to amplifier u1, can be obtained according to the empty short empty disconnected principle of amplifier:
U1+ ≈ u1-=vref, i1+=i1- ≈ 0 formula (1)
Can be obtained by formula (1):
Can be obtained by formula (2):
Because u1o is the low and high level signal of fixed amplitude, ideally, high level is power supply vcc, and low level is 0,
Can obtain the high and low thresholds voltage of u1 respectively:
Upper threshold:
Lower Threshold:
With regard to amplifier u2, can be obtained according to the empty short empty disconnected principle of amplifier:
U2+ ≈ u2-=vref, i2+=i2- ≈ 0 formula (4)
Can be obtained by formula (4):
If switching on power during t=0, have u1o to be low level signal, then u1o through r7 to c1 charge, make output voltage u2o by
Linear rule increases.When u2o rises to the voltage limit v1 that visits of u1ihWhen so that amplifier u1 output u1o from low level to high level
Saltus step, jumps to v1 under threshold voltage simultaneouslyilValue, hereafter u1o is that high level reversely charges to c1 through r7, and u2o declines, when dropping to
During threshold voltage v1il, amplifier u1 exports u1o and from high level to low transition, thus goes round and begins again, and produces concussion, according to
The high and low thresholds voltage of u1 and formula (5) can calculate the concussion cycle:By adjusting
Any one or more value in r1, r2, r3, r5, r7, c1, it is possible to adjust cycle of oscillation, also just can adjust sawtooth waveforms
Frequency.Increased resistance r4, the vibration that load causes can be reduced, increased pull-up resistor r6, the output that can raise u3o is high
Point is flat, that is, the output high level of pwm modulation circuit.
In order to become apparent from understanding the work process of circuit, build phantom, simulation parameter is as follows, vcc=15v, r1
=6k ω, r2=6k ω, r3=4.7k ω, r4=1k ω, r5=5.1k ω, r6=10k ω, c1=470nf, r7=5.3k ω
It is 10k ω adjustable resistance with rp1 (resistance is set to 4.5k).Shown in the simulation waveform of u1o such as Fig. 6 (a), the simulation waveform of u2o is such as
Shown in Fig. 6 (b), shown in simulation waveform such as Fig. 6 (c) of u3o.
Example IV
Embodiments provide a kind of DC brushless motor controller, refer to Fig. 7, it is the embodiment of the present invention four
A kind of DC brushless motor controller circuit diagram providing.
A kind of DC brushless motor controller, including above-mentioned pwm modulation circuit 1, also includes current rectifying and wave filtering circuit 3 and switch
Power supply 2, current rectifying and wave filtering circuit 3 is used for for AC rectification filtering becoming unidirectional current, provides the busbar voltage of DC brushless motor
With the voltage of Switching Power Supply 2, Switching Power Supply 2 is connected with current rectifying and wave filtering circuit 3 and pwm modulation circuit 1, for modulating electricity to pwm
Road 1 provides DC voltage.
In technical scheme provided in an embodiment of the present invention, due to not adopting price higher and needing the monolithic programming dynamo-electric
Road is realized, but employs the conventional devices such as the relatively low resistance of price, electric capacity and amplifier, effectively reduce pwm modulation circuit and
The manufacturing cost of DC brushless motor controller.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other Equivalent embodiments more can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (14)
1. a kind of pwm modulation circuit is it is characterised in that include:
Sawtooth waveforms generation module, for generating sawtooth waveforms；
Pwm speed-regulating signal generation module, is connected with described sawtooth waveforms generation module, receives described sawtooth waveforms, for according to described
Sawtooth waveforms generates pwm speed-regulating signal, and the dutycycle of described pwm speed-regulating signal is adjustable.
2. circuit according to claim 1 is it is characterised in that described pwm speed-regulating signal generation module includes:
First comparator and the first reference voltage circuit, described first reference voltage circuit is used for providing the first reference voltage, institute
The first input end stating first comparator is electrically connected with described first reference voltage circuit, for receiving described first with reference to electricity
Pressure, the second input of described first comparator is electrically connected with described sawtooth waveforms generation module, for receiving described sawtooth waveforms letter
Number, described first comparator exports the pwm speed-regulating signal of different duty according to the change of described first reference voltage.
3. circuit according to claim 2 is it is characterised in that described first reference voltage circuit includes:
Power supply and the first rheostat, the first end of described first rheostat and power electric connection, described first is variable
Second end ground connection of resistor, first reference voltage described in three-polar output of described first rheostat.
4. circuit according to claim 2 is it is characterised in that described pwm speed-regulating signal generation module also includes: the first electricity
Resistance and second resistance, the first input end of described first comparator is positive input terminal, the first end of described first resistor with described
The outfan electrical connection of first comparator, the second end of described first resistor and the first input end of described first comparator are electrically connected
Connect, the first end of described second resistance is electrically connected with the second end of described first resistor, the second end of described second resistance and institute
State the electrical connection of sawtooth waveforms generation module, for receiving sawtooth signal.
5. circuit according to claim 1 is it is characterised in that described sawtooth waveforms generation module includes:
Second reference voltage circuit, the second comparator and integral operation circuit, described second reference voltage circuit is used for offer the
Two reference voltages, the first input end of described second comparator is electrically connected with described second reference voltage circuit, for receiving
State the second reference voltage, the second input of described second comparator is electrically connected with the outfan of described integral operation circuit, institute
The outfan stating the second comparator is electrically connected with the input of integral operation circuit, the outfan of described integral operation circuit and institute
State the electrical connection of pwm speed-regulating signal generation module, export described sawtooth waveforms.
6. circuit according to claim 5 is it is characterised in that described sawtooth waveforms generation module also includes:
3rd resistor and the 4th resistance, the first input end of described second comparator is positive input terminal, the of described 3rd resistor
One end is electrically connected with the first input end of described second comparator, the second end of described 3rd resistor and described second comparator
Outfan electrically connects；The first end of described 4th resistance is electrically connected with the first end of described 3rd resistor, described 4th resistance
Second end is electrically connected with described second reference voltage circuit, for receiving the second reference voltage.
7. circuit according to claim 6 is it is characterised in that described 3rd resistor and/or the 4th resistance are variable resistance
Device.
8. circuit according to claim 5 is it is characterised in that described integral operation circuit includes: anti-phase integrator, institute
State anti-phase integrator and include the first amplifier, the first electric capacity and the 5th resistance, the first end of described first electric capacity and described first
The outfan electrical connection of amplifier, the second end of described first electric capacity is electrically connected with the inverting input of described first amplifier, described
The first end of the 5th resistance is electrically connected with the inverting input of described first amplifier, the second end of described 5th resistance and described the
The outfan electrical connection of two comparators, the in-phase input end of described first amplifier is electrically connected with described second reference voltage circuit,
For receiving the second reference voltage, the outfan of described first amplifier is electrically connected with described pwm speed-regulating signal generation module, output
Described sawtooth waveforms.
9. circuit according to claim 5 is it is characterised in that described integral operation circuit includes: homophase integrating circuit, institute
State homophase integrating circuit and include the second amplifier, the second electric capacity and the 6th resistance, the first end of described second electric capacity and described second
The outfan electrical connection of amplifier, the second end of described second electric capacity is electrically connected with the inverting input of described second amplifier, described
The first end of the 6th resistance is electrically connected with the inverting input of described first amplifier, the second end of described 6th resistance and described the
Two reference voltage circuits electrical connections, for receiving described second reference voltage, the in-phase input end of described second amplifier with described
The outfan electrical connection of the second comparator, the outfan of described second amplifier is electrically connected with described pwm speed-regulating signal generation module,
Export described sawtooth waveforms.
10. circuit according to claim 5 is it is characterised in that described integral operation circuit includes: rc integrating circuit, institute
State rc integral operation circuit and include the 3rd electric capacity and the 7th resistance, one end ground connection of described 3rd electric capacity, the other end and described the
The first end electrical connection of seven resistance, the second end of described 7th resistance is electrically connected with the outfan of described second comparator, described
The first end of the 7th resistance is electrically connected with described pwm speed-regulating signal generation module, exports described sawtooth waveforms.
11. circuit according to claim 8 are it is characterised in that described first capacitor's capacity and/or the 5th resistance can
Adjust.
12. circuit according to claim 9 are it is characterised in that described second capacitor's capacity and/or the 6th resistance can
Adjust.
13. circuit according to claim 10 are it is characterised in that described 3rd capacitor's capacity and/or the 7th resistance
Scalable.
A kind of 14. DC brushless motor controllers, including according to the arbitrary described pwm modulation circuit of claim 1～13, it is special
Levy and be, also include current rectifying and wave filtering circuit and Switching Power Supply, described current rectifying and wave filtering circuit is used for becoming AC rectification filtering
Unidirectional current, provides the busbar voltage of DC brushless motor and the voltage of described Switching Power Supply, described Switching Power Supply and described rectification
Filter circuit and described pwm modulation circuit connect, for providing DC voltage to described pwm modulation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610917315.1A CN106357169A (en) | 2016-10-20 | 2016-10-20 | PWM modulation circuit and direct-current brushless motor controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610917315.1A CN106357169A (en) | 2016-10-20 | 2016-10-20 | PWM modulation circuit and direct-current brushless motor controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106357169A true CN106357169A (en) | 2017-01-25 |
Family
ID=57863921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610917315.1A Pending CN106357169A (en) | 2016-10-20 | 2016-10-20 | PWM modulation circuit and direct-current brushless motor controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106357169A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107577184A (en) * | 2017-09-09 | 2018-01-12 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of compatible with digital and the interface circuit and its control method for simulating speed governing |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07336801A (en) * | 1994-06-09 | 1995-12-22 | Matsushita Electric Ind Co Ltd | Control and driving apparatus for car |
| CN201197114Y (en) * | 2008-01-31 | 2009-02-18 | 茂达电子股份有限公司 | Pulse width modulation structure with regulation work period |
| CN103298221A (en) * | 2013-07-01 | 2013-09-11 | 湖南工业大学 | Dimming circuit and method of LED (Light Emitting Diode) lighting lamp |
| CN103884445A (en) * | 2014-03-06 | 2014-06-25 | 深圳市汇川技术股份有限公司 | Circuit for detecting temperature of power module of driver |
| CN104459289A (en) * | 2014-12-22 | 2015-03-25 | 青岛歌尔声学科技有限公司 | Detection circuit and detection method based on waveform transformation |
| CN104506172A (en) * | 2014-11-26 | 2015-04-08 | 四川长虹欣锐科技有限公司 | 4-20mA current loop control PWM (Pulse Width Modulation) output circuit |
| CN104668736A (en) * | 2015-02-11 | 2015-06-03 | 上海广为焊接设备有限公司 | Remote control circuit of argon arc welding machine |
| CN105048923A (en) * | 2015-08-27 | 2015-11-11 | 河南省通信电缆有限公司 | Automatic speed regulation control device of slip motor |
| CN105391311A (en) * | 2015-07-10 | 2016-03-09 | 嘉兴百盛光电有限公司 | Circuit for achieving periodic frequency swiping on SG2525 power specialized chip |
| CN205545030U (en) * | 2016-04-14 | 2016-08-31 | 广州能迪能源科技股份有限公司 | Energy -saving's permanent magnet brushless DC motor fan coil |
| CN206533306U (en) * | 2016-10-20 | 2017-09-29 | 珠海格力节能环保制冷技术研究中心有限公司 | PWM circuit and DC brushless motor controller |
-
2016
- 2016-10-20 CN CN201610917315.1A patent/CN106357169A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07336801A (en) * | 1994-06-09 | 1995-12-22 | Matsushita Electric Ind Co Ltd | Control and driving apparatus for car |
| CN201197114Y (en) * | 2008-01-31 | 2009-02-18 | 茂达电子股份有限公司 | Pulse width modulation structure with regulation work period |
| CN103298221A (en) * | 2013-07-01 | 2013-09-11 | 湖南工业大学 | Dimming circuit and method of LED (Light Emitting Diode) lighting lamp |
| CN103884445A (en) * | 2014-03-06 | 2014-06-25 | 深圳市汇川技术股份有限公司 | Circuit for detecting temperature of power module of driver |
| CN104506172A (en) * | 2014-11-26 | 2015-04-08 | 四川长虹欣锐科技有限公司 | 4-20mA current loop control PWM (Pulse Width Modulation) output circuit |
| CN104459289A (en) * | 2014-12-22 | 2015-03-25 | 青岛歌尔声学科技有限公司 | Detection circuit and detection method based on waveform transformation |
| CN104668736A (en) * | 2015-02-11 | 2015-06-03 | 上海广为焊接设备有限公司 | Remote control circuit of argon arc welding machine |
| CN105391311A (en) * | 2015-07-10 | 2016-03-09 | 嘉兴百盛光电有限公司 | Circuit for achieving periodic frequency swiping on SG2525 power specialized chip |
| CN105048923A (en) * | 2015-08-27 | 2015-11-11 | 河南省通信电缆有限公司 | Automatic speed regulation control device of slip motor |
| CN205545030U (en) * | 2016-04-14 | 2016-08-31 | 广州能迪能源科技股份有限公司 | Energy -saving's permanent magnet brushless DC motor fan coil |
| CN206533306U (en) * | 2016-10-20 | 2017-09-29 | 珠海格力节能环保制冷技术研究中心有限公司 | PWM circuit and DC brushless motor controller |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107577184A (en) * | 2017-09-09 | 2018-01-12 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of compatible with digital and the interface circuit and its control method for simulating speed governing |
| CN107577184B (en) * | 2017-09-09 | 2019-07-05 | 珠海格力电器股份有限公司 | A kind of compatible with digital and the interface circuit and its control method of simulation speed regulation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103731022B (en) | Active power factor corrector circuit | |
| CA2845956C (en) | Voltage balancing system and method for multilevel converters | |
| US20170370993A1 (en) | Controllable load systems and methods | |
| CN206313746U (en) | A kind of voltage comparator | |
| JP2012085510A (en) | Charging device for power storage means | |
| CN103701421B (en) | Volume regulating device, volume regulating method and electronic equipment | |
| CN101473524A (en) | Motor control circuit, fan motor, electronic equipment and notebook-sized personal computer | |
| CN109193570A (en) | A kind of threshold variable hardware protection circuit of protection | |
| CN105937863A (en) | Communication circuit and method of electronic detonator | |
| CN106357169A (en) | PWM modulation circuit and direct-current brushless motor controller | |
| CN206533306U (en) | PWM circuit and DC brushless motor controller | |
| CN104883102B (en) | Stepper motor driving circuit | |
| CN206226795U (en) | Error amplification device and the drive circuit comprising the error amplification device | |
| CN102045019B (en) | Control structure and control method of coiled voltage stabilizer | |
| CN203645636U (en) | Volume adjusting device and electronic apparatus | |
| CN105099239A (en) | Inverter, automobile power supply device, and automobile apparatus | |
| CN101206490A (en) | Three-phase ac voltage stabilizer | |
| CN114142552A (en) | Constant-power charging circuit, electronic equipment and system | |
| CN102299683A (en) | Unipolar sinusoidal modulation wave generating circuit | |
| CN206002820U (en) | Aperture drive circuit, aperture drive system and video camera | |
| CN106026716A (en) | Water pump voltage control device and system | |
| CN210608972U (en) | Low-voltage three-phase brushless direct current motor control circuit | |
| CN202798549U (en) | Speed modulating interface circuit of motor hardware controller | |
| CN106571793A (en) | Pulse width modulation circuit based on TL494 chip | |
| CN201312308Y (en) | High-efficiency two-wire system power modulation bus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170125 |