CN102891641A - Motor driving device capable of adjusting rotating speed slope of motor - Google Patents
Motor driving device capable of adjusting rotating speed slope of motor Download PDFInfo
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- CN102891641A CN102891641A CN2011102039055A CN201110203905A CN102891641A CN 102891641 A CN102891641 A CN 102891641A CN 2011102039055 A CN2011102039055 A CN 2011102039055A CN 201110203905 A CN201110203905 A CN 201110203905A CN 102891641 A CN102891641 A CN 102891641A
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Abstract
The invention relates to a PWM (pulse-width modulation)control signal of which the input is changed by means of a PWM modulation module, so that a motor can be applied at different rotating speeds under the same PWM control signals, and the application flexibility of the motor is further increased. In addition, the PWM modulation module consists of a PWM modulation direction control circuit, a PWM modulation vector circuit and a PWM modulation signal generation circuit. Obviously, the PWM modulation module is connected with the PWM control signal input by an external system and an external adjustment device, and is set by the adjustment device to change the vector magnitude of the PWM control signal and the modulation direction so as to adjust the pulse cycle of the PWM control signal.
Description
Technical field
The invention relates to a kind of motor drive, particularly relevant for a kind of drive unit with adjustment motor rotary speed slope, it is the pwm signal that is changed input by the PWM modulating module that can adjust pwm pulse, so that motor is under identical PWM input signal, can reach the application of different rotating speeds, further increase thus the flexibility ratio of motor applications; In addition, motor drive of the present invention can use at single-phase motor and three-phase motor.
Background technology
The mode that conventional P WM control motor drives is exactly that the duty (rotating speed) of the PWM of input is what, and relatively required motor is exported duty what are exactly, shown in Figure 1A; For example: when pulse period of PWM (Duty Cycle) when being 50%, then motor can be exported 50% rotating speed.So, will present a kind of curve of linearity at the control curve of motor rotary speed, as shown in Figure 1B.
Yet, when the user wants to change the rotating speed of motor according to actual operating state; For example: when the temperature of the CPU (CPU) in individual desktop PC or the NB motherboard raises, in order to reach the temperature of energy fast reducing CPU, it can require to change the pwm pulse cycle (Duty Cycle) of input, or the coil design of change motor, so that motor can at identical pwm pulse under the cycle, have higher motor rotary speed output; But in a process matched well designed system, above-mentioned dual mode has it to implement operational difficulty place.For example: (be digital signal processor when wanting along with the practical operation situation changes controller; DSP) pwm pulse of input must change the control mode of whole system during the cycle; And if will change the coil of motor the time, then must change motor.
For being driven, pwm motor can have the function that changes motor rotary speed, the present invention is directed to this application, in the pwm motor drive unit, to have increased a PWM modulating module circuit (PWM-modulation block) to reach the slope of adjusting motor rotary speed, to increase adjustable pattern in the application of PWM control.To increase the pwm motor drive unit to the applying flexible degree of motor rotary speed control.
Summary of the invention
A main purpose of the present invention is providing a PWM modulating module, and the PWM modulating module is adjusted the pwm control signal of input thus, in order to reach the function of the slope of adjusting the motor output speed.
Another main purpose of the present invention is providing a PWM modulating module, the PWM modulating module is adjusted the pwm control signal of input thus, so that have the motor drive of this PWM modulating module, it can be according to different motor output demands, adjust the motor rotary speed slope, reach different settings.
According to above-mentioned purpose, the present invention at first provides a kind of motor drive of the PWM of having modulating module, it is by a single-phase motor 30, a motor output unit 100 that is connected with single-phase motor 30, a Hall voltage device 200, a Hall element 31 that is configured on this single-phase motor 30, and this Hall element 31 is connected with this Hall voltage device 200, and a PWM modulating module 300 forms, wherein PWM modulating module 300 comprises: a PWM modulation directional control circuit 310 (MDC), its input is connected with an outside adjusting device 400, and provide first voltage by outside adjusting device 400, its another input is connected with a reference voltage, with the first voltage and reference voltage relatively after, export an electric potential signal; A PWM modulation vector circuitry 320, its first input end is connected with the first voltage that outside adjusting device 400 provides, and the first voltage transitions become output after the first electric current, its second input is connected with the electric potential signal that PWM modulation directional control circuit 310 (MDC) is exported, pwm control signal 20 is done positive edge trigger or bear edge and trigger modulation vector voltage after processing to produce one, export after again modulation vector voltage transitions being become one second electric current, its 3rd input then is connected with a pwm control signal 20; And a PWM modulating signal produces circuit 330 (MSG), its first input end is connected with the first electric current and the second electric current, its second input is connected with the electric potential signal that PWM modulation directional control circuit 310 (MDC) is exported, its the 3rd input then is connected with a pwm control signal 20, with the modulating signal (MSG) of exporting a pulse; Wherein when modulating signal (MSG) when negative edge triggers, be after the first electric current is deducted the second electric current, convert the modulating signal (MSG) of pulse to, and export modulating signal (MSG) to motor output unit 100; When modulating signal (MSG) when positive edge triggers, be after the first electric current is added the second electric current, convert the modulating signal (MSG) of pulse to, and export modulating signal (MSG) to motor output unit 100.
The present invention then provides a kind of motor drive of the PWM of having modulating module, it comprises a three-phase motor 50, a three-phase motor driver element 500 that is connected with three-phase motor 50, and a PWM modulating module 300 forms, wherein this PWM modulating module 300 comprises: a PWM modulation directional control circuit 310 (MDC), its input is connected with an outside adjusting device 400, and provide the first voltage by outside adjusting device 400, its another input is connected with a reference voltage, with the first voltage and reference voltage relatively after, export an electric potential signal; A PWM modulation vector circuitry 320, its first input end is connected with the first voltage that outside adjusting device 400 provides, and the first voltage transitions become output after one first electric current, its second input is connected with the electric potential signal that PWM modulation directional control circuit 310 (MDC) is exported, pwm control signal 20 is done positive edge trigger or bear edge and trigger modulation vector voltage after processing to produce one, export after again modulation vector voltage transitions being become one second electric current, its 3rd input then is connected with a pwm control signal 20; And a PWM modulating signal produces circuit 330 (MSG), its first input end is connected with the first electric current and the second electric current, its second input is connected with the electric potential signal that PWM modulation directional control circuit 310 (MDC) is exported, its the 3rd input then is connected with a pwm control signal 20, with the modulating signal (MSG) of exporting a pulse; Wherein when modulating signal (MSG) when negative edge triggers, be after the first electric current is deducted the second electric current, convert the modulating signal (MSG) of pulse to, and export modulating signal (MSG) to this three-phase motor driver element 500; When this modulating signal (MSG) when positive edge triggers, be after the first electric current is added the second electric current, convert the modulating signal (MSG) of this pulse to, and export modulating signal (MSG) to this three-phase motor driver element 500.And three-phase motor driver element 500 is comprised of a back electromotive force detector 510, a phase rotated circuit 530 and a motor drive circuit 550, wherein back electromotive force circuit for detecting 510 is connected with three-phase motor 50, in order to detect three phase places (U, V, W) of this three-phase motor 50, again these three phase places are delivered in this phase rotated circuit 530, to convert corresponding driving voltage to, export this driving voltage to motor drive circuit 550 again, and then drive external motors 50.
Description of drawings
For being illustrated more clearly in the present invention, below enumerate preferred embodiment and cooperate accompanying drawing to be described in detail as follows, wherein:
Figure 1A is the mode schematic diagram that conventional P WM control motor drives;
Figure 1B is the curve synoptic diagram that conventional P WM control motor drives;
Fig. 2 A is the schematic diagram of motor drive of the present invention;
Fig. 2 B is the circuit diagram of the outside adjusting device among Fig. 2 A of the present invention;
Fig. 3 is the circuit diagram of PWM modulating module of the present invention;
Fig. 4 A is that modulating signal of the present invention (MSG) is to be the schematic diagram of electronegative potential in control signal (MDC);
Fig. 4 B is that modulating signal of the present invention (MSG) is to be the schematic diagram of high potential in control signal (MDC);
Fig. 5 is motor revolution of the present invention and drive cycle curve synoptic diagram; And
Fig. 6 is the schematic diagram of the motor drive of three-phase motor of the present invention.
Embodiment
The present invention is mainly disclosing a kind of motor drive, particularly relevant for a kind of drive unit with adjustment motor rotary speed slope, it is the pwm signal that is changed input by the PWM modulating module that can adjust pwm pulse, so that motor is under identical PWM input signal, can reach the application of different rotating speeds, further increase thus the flexibility ratio of motor applications.In addition, for clearly demonstrating the operating process of motor driving module of the present invention, in following declarative procedure, be to be illustrated take single-phase motor as embodiment; Yet application of the present invention is not confined to the application of single-phase motor, and it also can use in the application of multi-phase motor.Simultaneously, the single-phase motor that motor driving module of the present invention will drive or multi-phase motor are all identical with present employed motor, so in following explanation, not to single-phase motor or the type of drive of multi-phase motor elaborates.In following explanation, main in detail exposure PWM modulating module of the present invention.
At first, please refer to Fig. 2 A and 2B, is the schematic diagram for motor drive of the present invention, and wherein Fig. 2 A is the function block schematic diagram of motor drive of the present invention; And Fig. 2 B is the schematic diagram of the modulation circuit among Fig. 2 A.Shown in Fig. 2 A, motor drive 10 of the present invention comprises an output unit 100 that is connected with single-phase motor 30, one and the Hall element 31 on the single-phase motor 30, a Hall voltage device 200 that provides Hall element 31 to carry out detecting is provided, and one has the PWM modulating module 300 of adjusting the motor rotary speed slope; Wherein PWM modulating module 300 is by a PWM modulation directional control circuit 310 (PWM Modulation Direction Control Circuit; MDC), PWM modulation vector circuitry 320 (PWM Modulation Vector Transfer Circuit; MVT) and PWM modulating signal produce circuit 330 (PWMmodulation signalgeneration Circuit; MSG) form.Clearly, PWM modulating module 300 of the present invention is connected with pwm control signal 20 and the outside adjusting device 400 by the external system input, and via the setting to adjusting device 400, change the vector magnitude of pwm control signal 20 and the direction of modulation, to reach the pulse period (Duty Cycle) of adjusting pwm control signal 20.Only do explanation with single-phase motor at this example, three-phase motor drives, equally applicable the present invention.Simultaneously, because Hall voltage device 200 main applications of the present invention are carried out the required voltage of detecting except purposes provides Hall element 31, also need further to be used to provide the bias voltage of outside adjusting device 400; Therefore, Hall voltage device 200 of the present invention can option and installment in motor drive 10 of the present invention, or by the external voltage source of Hall voltage device 200 by motor drive 10 of the present invention provided, the present invention is not limited the configuration of this motor drive 10.
Please refer to Fig. 2 B, PWM modulating module 300 of the present invention is connected with pwm control signal 20 and the outside adjusting device 400 by the external system input; Wherein, external system can be a digital signal processor (DSP), in order to the pwm control signal 20 of exporting a system; For example: the digital signal processor in individual desktop PC or the NB motherboard; This pwm control signal 20 can be connected with PWM modulation vector circuitry 320 and the PWM modulating signal generation circuit 330 in the PWM modulating module 300.In addition, outside adjusting device 400 can be that a bleeder circuit forms, one end of this outside adjusting device 400 is connected with Hall voltage device 200, and its other end then is connected with PWM modulation directional control circuit 310 and PWM modulation vector circuitry 320 in the PWM modulating module 300.And in the present embodiment, outside adjusting device 400 can be one by the formed bleeder circuits of a plurality of electricity groups, in order to provide a voltage to PWM modulating module 300.Therefore, the present invention can reach the function of the pulse period (Duty Cycle) of adjusting pwm control signal 20 by the setting to outside adjusting device 400.
Then, please refer to Fig. 3, is the circuit diagram of PWM modulating module of the present invention.As shown in Figure 3, PWM modulating module 300 is comprised of a PWM modulation directional control circuit 310, a PWM modulation vector circuitry 320 and a PWM modulating signal generation circuit 330.Wherein PWM modulation directional control circuit 310 mainly is comprised of a comparator 315, and an end of comparator 315 is and a built in potential V
RefConnect, the other end of comparator 315 then be with outside adjusting device 400 in series resistance R
1And R
2Connect, wherein, resistance R
1An end be connected and resistance R with Hall voltage device 200
2An end be connected with earth point (GND); By series resistance R
1And R
2Connect the partial pressure potential (VMS) that produces.This partial pressure potential meeting and built in potential V
RefCompare, when partial pressure potential during greater than built in potential, then PWM modulation directional control circuit 310 can be via the MDC signal of an electronegative potential of comparator 315 outputs; Otherwise when partial pressure potential during less than built in potential, then PWM modulation directional control circuit 310 can be via the MDC signal of a high potential of comparator 315 outputs.In addition, the voltage quasi position of above-mentioned partial pressure potential also has another function, exactly with the size that decides PWM modulation amount, as voltage quasi position and built in potential V
RefDifference less, formed PWM modulation amount is just less, on the contrary as voltage quasi position and built in potential V
RefDifference larger, formed PWM modulation amount is just larger.Refer again to Fig. 3 explanation, PWM modulation vector circuitry 320 is comprised of three voltage current adapters (V toI conveter) and a positive and negative edge trigger selector 3240; Wherein, in the present embodiment, each voltage- current converter 3210,3220,3230 is formed (current mirroring circuit is not shown among the figure) by different current mirror (Current Mirror) circuit; Positive and negative edge trigger selector 3240 then is to produce a slight positive and negative edge start pulse signal by a time delay filter (time delay filter), add some simple logical circuits and control four switches of S1-S4, after converting different modulation vector voltage in order to pwm control signal 20 that will input to according to different pwm pulses, convert respectively modulation vector voltage to I via the 3rd V to I transducer 3230 again
F1And I
F2Electric current, and pass to the PWM modulating signal and produce current control circuit 3310 in the circuit 330, wherein I
F1And I
F2Current value identical.
The first voltage-current converter 3210 its inputs are to be connected with the voltage of a built in potential, voltage transitions is become one first fixed current (I
Vref); The input of second voltage-current converter 3220 then be with outside adjusting device 400 in R
1And R
2The formed partial pressure potential of series resistance connects, with converting partial pressure potential (VMS) to second fixed current (I
Vms).Afterwards, the first fixed current (I that is produced by the first voltage-current converter 3210 and voltage-current converter 3220
Vref) and the second fixed current (I
Vms) can be via a differential circuit 3250, and thus a differential circuit 3250 with the first fixed current (I
Vref) and the second fixed current (I
Vms) do the action of subtracting each other after, first an electric current (I of generation
Diff); Afterwards, this first electric current (I
Diff) be the present invention with deciding an initial vector of vector magnitude; This first electric current (I
Diff) electric current be sent to respectively the PWM modulating signal and produce current control circuit 3310 in the circuit 330, the I that is about to indicate
AAnd I
BElectric current is delivered to current control circuit 3310, wherein I
AWith I
BCurrent value identical.
Then, current control circuit 3310 is again with the control signal (MDC) of pwm control signal 20, PWM modulation directional control circuit 310, the I that modulation vector voltage signal converts to
F1And I
F2The I that electric current and initial vector produce
AAnd I
BElectric current carries out after the computing, and it (is by a capacitor C that the electric current after the computing is delivered to current-voltage conversion circuit 3320
2And process in reverser-Inverter); Namely with the vector value after current control circuit 3310 computings, again via the capacitor C in the current-voltage conversion circuit 3320
2Value converts MSG voltage modulation signal to, at last this MSG voltage modulation signal is converted to digital signal via reverser after, output to motor output unit 100, remove to control motor running.
In addition, the control signal (MDC) of the pwm control signal 20 of input and PWM modulation directional control circuit 310 also can be input to the positive and negative edge trigger selector 3240 in the PWM modulation vector circuitry 320 together; Wherein, PWM modulation vector circuitry 320 provides the purpose of control signal, mainly is that the pwm control signal 20 with input deals with, being that positive edge triggers or bears the edge triggering with deciding pwm signal; As shown in Figure 3, when control signal (MDC) is electronegative potential, then can selectively with switch S 2 conductings, simultaneously switch S 1 be closed; And after the control signal (MDC) of electronegative potential is processed through positive and negative edge trigger selector 3240, can choose negative edge to trigger; At this moment, then can selectively switch S 3 be understood conductings, simultaneously switch S 4 can be closed.Because when switch S 3 triggered at negative edge, it only was converted to the moment ability conducting of electronegative potential at the pwm control signal 20 of input by high potential, its main purpose is in order to capacitor C
1Voltage move built in potential to, with as capacitor C
1Initial value; In addition, switch S 2 maintains in control signal under the state of electronegative potential, then is the conducting that continues, at this moment capacitor C
1On voltage, the electric current that can connect by switch S 2 is done the action of constant-current discharge; The time of discharge then is that the pwm control signal 20 by input equals the electronegative potential time and decides.Along with pulse period (duty cycle) of pwm control signal 20 of input becomes greatly gradually, clearly, its capacitor C
1The time of discharge will shorten, so that be retained in capacitor C
1On modulation vector voltage (MVT) will gradually uprise; Then, this capacitor C
1On modulation vector voltage through behind tertiary voltage-current converter 3230, to produce second electric current; This second electric current can be along with capacitor C
1On voltage raise and become gradually large; Afterwards, PWM modulation vector circuitry 320 can be delivered to this second electric current respectively the current control circuit 3310 in the PWM modulating signal generation circuit 330, is about to I
F1And I
F2Deliver to the PWM modulating signal and produce circuit 330, with the compensate for displacement amount as modulating signal, wherein, I
F1And I
F2Current value identical.Clearly, the compensation vector electric current I exported of PWM modulation vector circuitry 320
F1And I
F2Can gradually become large.
Please continue with reference to figure 3, when control signal (MDC) is high potential, can selectively with switch S 1 conducting, simultaneously switch S 2 be closed; And after the control signal (MDC) of high potential is processed through positive and negative edge trigger selector 3240, can choose positive edge to trigger; At this moment, then can selectively switch S 3 can be closed and simultaneously can conductings with switch S 4; Similarly, when switch S 4 when positive edge triggers, it only is converted to the just conducting of moment of high potential at the pwm control signal 20 of input by electronegative potential, its main purpose is capacitor C
1On voltage move 0 current potential (being earth point GND) to, with as capacitor C
1Initial value.In addition, switch S 1 maintains under the state of high potential in control signal (MDC), then is the conducting that continues, at this moment capacitor C
1On voltage, the electric current that can be connected by switch S 1 is done the action of constant-current charge, then is that pwm control signal 20 by input equals the high potential time and decides.Along with pulse period of pwm control signal 20 of input becomes greatly capacitor C gradually
1The time of charging will be elongated, so that stay capacitor C
1On voltage will gradually uprise, through behind tertiary voltage-current converter 3230, to produce second electric current; This second electric current can be along with capacitor C
1On voltage raise and become gradually large; Afterwards, PWM modulation vector circuitry 320 can be delivered to this second electric current respectively the current control circuit 3310 in the PWM modulating signal generation circuit 330, is about to I
F1And I
F2Deliver to the PWM modulating signal and produce circuit 330, with the compensate for displacement amount as the PWM modulating signal, wherein, I
F1And I
F2Current value identical.Clearly, the compensation vector electric current I of the modulation vector exported of PWM modulation vector circuitry 320
F1And I
F2Can gradually become large.
Follow, refer again to Fig. 3, the first electric current, the second electric current, current control circuit 3310 and current-voltage conversion circuit 3320 that the PWM modulating signal produces circuit 330 mainly to be provided by PWM modulation vector circuitry 320 are formed; Wherein, the first electric current produces in the circuit 330 at the PWM modulating signal and forms respectively electric current I
AAnd electric current I
B, the second electric current then can produce in the circuit 330 at the PWM modulating signal and form respectively electric current I
F2And electric current I
F1In addition, the input of current control circuit 3310 is connected with pwm control signal 20, and the output of current control circuit 3310 then is connected to the capacitor C in the current-voltage conversion circuit 3320
2After, again through behind the inverter, export a MSG voltage modulation signal.
PWM modulating signal such as Fig. 3 produces shown in the circuit 330 electric current I
F2And electric current I
AElectric current is the action of doing addition; And electric current I
F1And electric current I
BElectric current then is to do to subtract each other action; In addition, the control signal (MDC) that PWM modulation directional control circuit 310 is exported to PWM modulating signal produces in the circuit 330, and it is that to be selected by the first transistor M1 and the formed switch of transistor seconds M2 be to carry out I
F2+ I
AI is still carried out in action
F1-I
BAction.In an embodiment of the present invention, the control signal (MDC) of exporting when PWM modulation directional control circuit 310 then selects to carry out I when being electronegative potential
F1-I
BAction; Otherwise the control signal (MDC) of exporting when PWM modulation directional control circuit 310 then is to select to carry out I when being high potential
F2+ I
AAction; Hereby be described in detail as follows.
Extend explanation such as precedent, the control signal (MDC) of exporting when PWM modulation directional control circuit 310 is (such as the MDC=L waveform among Fig. 4 A) when being electronegative potential, electric current I
F1Can be sent to the PWM modulating signal by PWM modulation vector circuitry 320 and produce circuit 330 and do the action of subtracting each other with electric current I B, and electric current I
F1Can become along with the pulse period of pwm control signal 20 conductings of inputting and become greatly and gradually large (such as the PWM Signal waveform among Fig. 4 A).In addition, when the pulse period of pwm control signal 20 conductings of inputting is very little, electric current I
F1Also can be very little, so work as electric current I
F1Cut electric current I
BCan obtain a negative value, at this moment, namely represent capacitor C
2On voltage can not be discharged; Behind a current-voltage conversion circuit 3320, the modulating signal (such as the first half section of the MSG waveform among Fig. 4 A) that can to obtain a perseverance be electronegative potential; Then, after the pulse period of pwm control signal 20 conductings of inputting becomes greatly gradually, electric current I
F1Also can gradually become large; So work as electric current I
F1Greater than electric current I
BThe time, so that electric current I
F1Subtract electric current I
BWill on the occasion of, clearly, this moment capacitor C
2On electric current will be via electric current I
F1Discharge, after a current-voltage conversion circuit 3320, can in MSG voltage modulation signal, a small-pulse effect can occur, and this pulse meeting is along with electric current I
F1Slowly become large, and so that the wave impulse on the MSG voltage modulation signal will become large gradually; When the PWM of the pwm control signal 20 of inputting was 100%, its output also can be 100% conducting, shown in the second half section of the MSG voltage modulation signal waveform among Fig. 4 A.
Otherwise the control signal (MDC) of exporting when PWM modulation directional control circuit 310 is (such as the MDC=H waveform among Fig. 4 B), then electric current I when being high potential
F2Can be sent to the PWM modulating signal by PWM modulation vector circuitry 320 and produce circuit 330, and and electric current I
ADo the action of addition, and electric current I
F2Can become large along with the pulse period of pwm control signal 20 conductings of inputting and become large (such as the PWM Signal waveform among Fig. 4 B).Similarly, when the pulse period of pwm control signal 20 conductings of inputting is very little, electric current I
F2Also can be very little, so work as electric current I
F2Add electric current I
ACan obtain one on the occasion of, namely represent capacitor C this moment
2On voltage can be recharged, but because electric current I
F2Also very little, so the charging current of this moment is with electric current I
ABe main; After passing through current-voltage conversion circuit 3320, can obtain a modulating signal (such as the first half section of the MSG waveform among Fig. 4 B), this MSG voltage modulation signal is that the pwm control signal 20 of input adds that modulation vector voltage (MVT) forms again; Then, after the pulse period of pwm control signal 20 conductings of inputting becomes greatly gradually, electric current I
F2Also can gradually become large; So work as electric current I
F2Much larger than electric current I
AThe time, electric current I
F2+ electric current I
AWill be with electric current I
F2Be main, electric current I gradually
ASide-play amount will diminish.At this moment, capacitor C
2On voltage will be via electric current I
F2+ I
ACharge, from again through after the current-voltage conversion circuit 3320, obtain the pulse signal of MSG voltage modulation signal output, shown in the second half section of the MSG waveform among Fig. 4 B.
After MSG voltage modulation signal inputs to output unit 100, namely can provide current to coil on the motor 30 by the pulse period driver output circuit 110 of modulating signal (MSG) and output circuit 130, rotate with CD-ROM drive motor 30.At this moment, the drive cycle curve of motor 30 rotating speeds (RMS) and modulating signal (MSG) as shown in Figure 5, and each bar control curve among Fig. 5 can change according to the size of the partial pressure potential of outside.For example: when partial pressure potential=1.0V, the drive cycle curve of its motor rotary speed and modulating signal such as the 1st curve among Fig. 5; When partial pressure potential=0.4V, the drive cycle curve of its motor rotary speed and modulating signal such as the 2nd curve among Fig. 5; When partial pressure potential=1.4V, the drive cycle curve of its motor rotary speed and modulating signal such as the 3rd curve among Fig. 5.Clearly, in the present embodiment, when partial pressure potential was turned down, the drive cycle slope of a curve of motor rotary speed and modulating signal can diminish, so motor rotary speed can reduce; And when partial pressure potential was heightened, the drive cycle slope of a curve of motor rotary speed and modulating signal can become greatly, so motor rotary speed can raise.Therefore, the present invention can comply with the different radiating requirements of its system that depends on (for example: individual desktop PC or NB motherboard), and the size of the partial pressure potential that sets via outside adjusting device 400, adjust the motor rotary speed slope, so can increase the applying flexible degree to motor rotary speed control.Want lay special stress at this, above-mentioned one of for the disclosed embodiment of the present invention, so being restriction, it is not designed to when lower when partial pressure potential, then the drive cycle slope of a curve enforcement aspect that can diminish; In other words, the disclosed content according to the present invention, also can select partial pressure potential is designed to higher, and the enforcement aspect that the drive cycle slope of a curve can diminish; To this, the present invention is not limited.
Then, please refer to Fig. 6, it is the schematic diagram of the drive unit of three-phase motor of the present invention.As shown in Figure 6, three-phase motor driver element 500 of the present invention is comprised of back electromotive force detector 510, phase rotated circuit 530, motor drive circuit 550 and a voltage supply device 200 ' institute; Wherein back electromotive force circuit for detecting 510 is connected with three-phase motor 50, to detect three phase places (U, V, W) of three-phase motor 50; Afterwards, three phase places of three-phase motor 50 are delivered in the phase rotated circuit 530, become corresponding driving voltage with three phase transition with three-phase motor 50; Again driving voltage is exported to motor drive circuit 550, and then drive external motors 50; In addition, in an embodiment of the present invention, this three-phase motor 50 also can be a kind of three-phase motor 50 of non-inductive element; More than structure about three-phase motor identical with traditional three-phase motor, so its detailed operating process namely repeats no more.
Major technique of the present invention is to provide a PWM modulating module 300, and the size of the partial pressure potential that is set by an outside adjusting device 400 is so that PWM modulating module 300 is adjusted the pwm control signal 20 of input according to the size of this partial pressure potential; Wherein, an end of outside adjusting device 400 is to be connected with voltage supply device 200 ', to produce the size of partial pressure potential; And according to the size of this partial pressure potential so that the different modulating signal (MSG) of PWM modulating module 300 outputs, so that the modulating signal that PWM modulating module 300 is exported (MSG) is delivered to the phase rotated circuit 530 in the three-phase motor driver element 500, so that the motor drive circuit 550 of three-phase motor, it can adjust the motor rotary speed slope according to modulating signal (MSG), reaches different settings.Clearly, circuit structure, the control signal of PWM modulating module 300 in the present embodiment and the motor revolution that produces and drive cycle curve are all with aforementioned identical to the description among Fig. 3 to Fig. 5, so repeat no more its detailed operating process.
It more than is the explanation for preferred embodiment of the present invention, for illustrating purpose of the present invention, and be not intended to limit accurate application form of the present invention, therefore not violating within the present invention illustrated spirit and scope, all contained by the above or by embodiments of the invention.Therefore, technological thought of the present invention will be decided by claim scope of the present invention and equalization thereof.
Claims (10)
1. motor drive with PWM modulating module, this motor drive be by a motor, a motor output unit that is connected with this motor, and a PWM modulating module forms, wherein this PWM modulating module comprises:
One PWM modulation directional control circuit is in order to export an electric potential signal;
One PWM modulation vector circuitry is with the electric potential signal of this PWM modulation directional control circuit and be connected with a pwm control signal, in order to a pwm control signal is converted to the vectorial voltage of modulation; And
One PWM modulating signal produces circuit, is connected with electric potential signal and the pwm control signal of this PWM modulation directional control circuit, to export a voltage modulation signal; Wherein
This voltage modulation signal becomes this current-voltage conversion circuit via result and a current-voltage conversion circuit of the computing of current control circuit institute with the current conversion after the computing, and exports this current-voltage conversion circuit to this motor output unit.
2. the motor drive with PWM modulating module as claimed in claim 1, wherein this electric potential signal of exporting of this PWM modulation directional control circuit compares this first voltage and reference voltage via a comparator.
3. the motor drive with PWM modulating module as claimed in claim 1, wherein should the outside adjusting device by the formed bleeder circuit of a plurality of resistance, and a end that should the outside adjusting device is connected with a voltage device, to produce this first voltage.
4. the motor drive with PWM modulating module as claimed in claim 1, wherein this PWM modulation vector circuitry is comprised of three voltage-current converters, a differential circuit and a time delayed filtering device at least.
5. the motor drive with PWM modulating module as claimed in claim 4, wherein an input of this first voltage-current converter is connected with this reference voltage, this reference voltage is converted to one first fixed current, the input of this second voltage-current converter then is connected with this first voltage and converts the second fixed current to, this first fixed current and this second fixed current are passed through this differential circuit, after producing this first electric current, export.
6. the motor drive with PWM modulating module as claimed in claim 4, wherein an input of this tertiary voltage-current converter is connected with this modulation vector voltage, and exports after the vectorial voltage transitions of this modulation become one second electric current.
7. the motor drive with PWM modulating module as claimed in claim 6, wherein these three voltage-current converters form by current mirroring circuit.
8. the motor drive with PWM modulating module as claimed in claim 1, wherein this current control circuit carries out negative edge triggering according to this electric potential signal that this PWM modulation directional control circuit is exported via a first transistor and the formed switch of a transistor seconds, so that this first electric current deducts the second electric current, or when carrying out positive edge and triggering, so that this first electric current adds the second electric current.
9. motor drive with PWM modulating module, this motor drive comprises a three-phase motor, a three-phase motor driver element that is connected with this three-phase motor, and a PWM modulating module forms, wherein this PWM modulating module comprises:
One PWM modulation directional control circuit, one input end is connected with an outside adjusting device, and provides one first voltage by this outside adjusting device, and its another input is connected with a reference voltage, with this first voltage and this reference voltage relatively after, export an electric potential signal;
One PWM modulation vector circuitry, its first input end is connected with this first voltage that this outside adjusting device provides, and this first voltage transitions become output after one first electric current, its second input is connected with the electric potential signal that this PWM modulation directional control circuit is exported, its the 3rd input then is connected with a pwm control signal, in order to a pwm control signal is converted to modulation vector voltage, export after again this modulation vector voltage transitions being become one second electric current; And
One PWM modulating signal produces circuit, its first input end is connected with this first electric current and this second electric current, its second input is connected with the electric potential signal that this PWM modulation directional control circuit is exported, and its 3rd input then is connected with a pwm control signal, to export a voltage modulation signal; Wherein
This voltage modulation signal becomes this current-voltage conversion circuit via result and a current-voltage conversion circuit of the computing of current control circuit institute with the current conversion after the computing, and exports this current-voltage conversion circuit to this three-phase motor driver element.
10. the motor drive with PWM modulating module as claimed in claim 9, wherein this three-phase motor driver element is comprised of a back electromotive force detector, a phase rotated circuit and a motor drive circuit, this back electromotive force circuit for detecting is connected with this three-phase motor, in order to detect three phase places of this three-phase motor, again these three phase places are delivered in this phase rotated circuit, to convert corresponding driving voltage to, export this driving voltage to motor drive circuit again, and then drive external motors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110203905.5A CN102891641B (en) | 2011-07-20 | 2011-07-20 | Motor driving device capable of adjusting rotating speed slope of motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110203905.5A CN102891641B (en) | 2011-07-20 | 2011-07-20 | Motor driving device capable of adjusting rotating speed slope of motor |
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| CN102891641B CN102891641B (en) | 2015-01-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571811A (en) * | 2015-10-09 | 2017-04-19 | 张伟林 | Synchronous-compensation-type three-phase motor synchronous control circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080018295A1 (en) * | 2004-01-27 | 2008-01-24 | Rohm Co., Ltd. | Motor Drive Control Circuit and Motor Apparatus Using The Same |
| CN101895246A (en) * | 2010-06-08 | 2010-11-24 | 上海新进半导体制造有限公司 | Control pulse generating circuit and regulating system and method of direct current brushless motor speed |
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2011
- 2011-07-20 CN CN201110203905.5A patent/CN102891641B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080018295A1 (en) * | 2004-01-27 | 2008-01-24 | Rohm Co., Ltd. | Motor Drive Control Circuit and Motor Apparatus Using The Same |
| CN101895246A (en) * | 2010-06-08 | 2010-11-24 | 上海新进半导体制造有限公司 | Control pulse generating circuit and regulating system and method of direct current brushless motor speed |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571811A (en) * | 2015-10-09 | 2017-04-19 | 张伟林 | Synchronous-compensation-type three-phase motor synchronous control circuit |
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| CN102891641B (en) | 2015-01-21 |
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