CN1567698A

CN1567698A - Motor-drive circuit having frequency setting and correcting function and method thereof

Info

Publication number: CN1567698A
Application number: CN 03148672
Authority: CN
Inventors: 许家彰; 陈彦仲
Original assignee: Prolific Technology Inc
Current assignee: Prolific Technology Inc
Priority date: 2003-06-17
Filing date: 2003-06-17
Publication date: 2005-01-19
Anticipated expiration: 2023-06-17
Also published as: CN100367654C

Abstract

The invention is a frequency setting and correcting electric machine driving circuit and method, and the driving circuit at least contains: a speed control device able to receive detecting signal and speed frequency signal at the same time, forming a pulse width modulation signal able to modulate driving duty ratio in a mode of regulating pulse width, transmitting the modulation signal to a driving time sequence controller to generate a time sequence control signal so as to control the output time sequence of power driving signal of a driving device and at the same time using a detecting device to detect the motor to generate a correcting detection signal and immediately feeding the correcting detection signal back to the speed control device to form a close loop control, and then automatically correcting and setting the speed frequency of the motor.

Description

Tool frequency setting and correcting electric machine driving circuit and method thereof

Invention field

The present invention relates to a kind of drive circuit of motor, particularly relate to a kind of have frequency setting and correcting electric machine driving circuit and method thereof.

Background technology

Along with the high development of Information technology and the application popularization of computer industry, for example products such as mobile computer, scanner, power supply unit and precision electronic device extensively are used.Generally speaking, in order to make the maximum usefulness of above-mentioned electronic product performance, it is very important that heat transmits fast, because when heat accumulation can't dissipate in real time in product inside, will make the electronic building brick can't operate as normal, even make whole electronic system work as machine.Usually, use brushless d.c. motor fan as the device that transmits heat, so that the various electronic building bricks of internal system can normal operation under the temperature environment of the best.

See also 1A-1B figure, it represents the drive circuit and the method flow diagram thereof of traditional brushless d.c. motor respectively.In step 106, the Distribution of Magnetic Field of at first utilizing Hall element (Hall Sensor) detection rotor magnet 104 is to form induced signal.In step 108, use controller 100 to receive induced signal then to produce not correcting controlling signal.Then in step 110, driver 102 carries out driving power with control signal and amplifies, and the switch current direction is to change the polarity in coil-induced magnetic field.In step 112, utilize coil-induced magnetic field at last, use driving rotor magnet 104 and carry out the running of specific direction the magnetic force that rotor magnet 104 is produced.

So the driving method of traditional brushless d.c. motor is the type of drive of open loop (Open Loop), that is controller can only be exported not calibrated control signal by uniaxially, send uncorrected control signal to driver 102 again so that motor running, so motor rotary speed is determined by the driving force and the motor load of motor driver.Driver can't be controlled motor rotary speed by traditional driving method.It can only rely on the motor mechanical parameter and control motor rotary speed.

Secondly, when traditional brushless d.c. motor operation is turned round, though fix just beginning in a period of time the rotating speed of motor, but after one period service time, motor will lose the specification speed-frequency of original the best, cause motor rotary speed to produce the bad phenomenon of drift, and for example air quantity is stable inadequately, cause motor to produce serious noise, vibration, and then influence the operation of whole system.

Because traditional brushless d.c. motor forms structural defective easily when making production, problems such as for example mechanism's rigging error, coil shape variation, pad distortion and bearing lubrication deficiency, so that cause the motor of same batch but to have the different situation of rotating speed specification to take place, thereby must eliminate the product of a large amount of off-gauges, directly improved the whole manufacturing cost of product.

On the other hand, in the traditional computer host computer system, the running of brushless d.c. motor must see through main frame indirectly and carry out the detection of speed-frequency, then utilize measured speed-frequency to carry out complicated correction program again, could obtain specification speed-frequency accurately, change speech, brushless d.c. motor itself does not have the function that direct detection is proofreaied and correct, even computer host system will seriously increase the burden of computer host system virtually when if the speed-frequency that must detect motor frequently could obtain real motor rotary speed.

Therefore, traditional brushless d.c. motor is easy to generate the problem of specification speed-frequency generation drift change when manipulating, so that system is normally operated.Even when manufacturing because structural error causes rotating speed off-gauge situation.

Summary of the invention

In view of the problems of above-mentioned traditional brushless d.c. motor in manufacturing and use.Therefore, main purpose of the present invention makes the running of motor maintain fixing speed-frequency all the time for utilizing a kind of motor drive circuit, reaches motor stator function frequently, has solved motor in the long-term problem of using the back that the speed-frequency drift takes place.

Another object of the present invention cooperates a frequency generator for utilizing motor drive circuit, formation has the drive circuit that can set the speed-frequency function, make manufacturer can produce the motor of speed-frequency unanimity and same batch easily, be beneficial to the QC flow process.The more important thing is under the condition of using identical coil turn, only need to set the parameter of the generator of adjusting frequency, can produce the motor of different rotating speeds specification demand, significantly to simplify the processing procedure that coiling forms coil.

According to above-mentioned purpose, the present invention proposes a kind of have frequency setting and correcting electric machine driving circuit and method thereof, and motor drive circuit comprises at least:

(1) speed control unit, utilize detection signal input and tach signal input simultaneously, import detection signal and tach signal respectively to form phase signal, form by the mode of pulse width modulation and can modulate the pulse width modulation signal of driving time than (Duty Ratio), wherein the pulse width modulation signal is corresponding to the phase signal between detection signal and tach signal, and the pulse width modulation signal is in real time corresponding to the actual speed frequency of motor.

(2) drive unit, first power take-off and second power take-off are coupled respectively to motor winding, drive unit has plurality of transistors to produce the power drive signal, and utilize checkout gear to produce the correct detection signal, and will proofread and correct detection signal and feed back (Feedback) immediately to speed control unit, the control of formation closed-loop path is with the speed-frequency of automatic correcting motor.

(3) drive time schedule controller, be coupled respectively to the modulating signal output and the signal input part of speed control unit, drive time schedule controller received pulse width modulation signal, and utilize a plurality of switch modules to produce timing control signal, with the output timing of power controlling drive signal, avoid the drive unit short circuit simultaneously.

In addition, drive circuit also comprises:

(1) lock detect circuit is linked to the driving time schedule controller, and lock detect circuit is used to detect the blocking of motor rotor, and when rotor was locked, motor can shut down operation to reduce the consumption of power supply.

(2) the locking time schedule controller is linked to lock detect circuit, and the locking time schedule controller is used to modulate lock detect circuit, by adjusting the power drive signal, with a continuous ground actuating motor.And

(3) frequency processing device is coupled respectively to detection signal input and lock detect circuit, and the frequency processing device receives detection signal, and utilizes detection signal to carry out frequency and convert.

When operating, at first import detection signal and tach signal, wherein this detection signal produces with checkout gear.Then utilize speed control unit to receive detection signal and tach signal simultaneously forming phase signal, and form the pulse width modulation signal that to modulate the driving time ratio in the mode of pulse width modulation.Use drive unit to produce the power drive signal afterwards,, wherein use to drive time schedule controller received pulse width modulation signal, produce the output timing of timing control signal power controlling drive signal with speed-frequency from dynamic(al) correction or setting motor.At last, detect the actual speed frequency of motor in real time with this checkout gear, and produce the correct detection signal, and will proofread and correct detection signal and feed back (Feedback) immediately, to form closed-loop path control to speed control unit.

Specifically, according to one aspect of the present invention, provide the motor drive circuit of a kind of tool from dynamic(al) correction speed-frequency function, this drive circuit comprises at least:

A signal input part and a modulating signal output, utilize detection signal input and tach signal input simultaneously, import this detection signal and this tach signal respectively to form a phase signal, mode by pulse width modulation forms the pulse width modulation signal that can modulate the driving time ratio, wherein this pulse width modulation signal is corresponding to this phase signal between this detection signal and this tach signal, and this pulse width modulation signal is in real time corresponding to the actual speed frequency of motor;

One drive unit, have one first power take-off, one second power take-off and a signal input part, wherein this first power take-off and this second power take-off are coupled respectively to motor winding, this drive unit has plurality of transistors to produce a power drive signal, and utilize this checkout gear to produce a correct detection signal, and this correct detection signal is fed back to this speed control unit immediately, form closed-loop path control, with the speed-frequency of automatic correcting motor;

One drives time schedule controller, be coupled respectively to this modulating signal output of this speed control unit and this signal input part of this drive unit, this driving time schedule controller receives this pulse width modulation signal, and utilize a plurality of switch modules to produce a timing control signal, to control the output timing of this power drive signal, avoid the drive unit short circuit simultaneously;

One lock detect circuit is linked to this driving time schedule controller, and this lock detect circuit is used to detect the blocking of motor rotor, and when rotor was locked, motor can shut down operation to reduce the consumption of power supply; And

One locking time schedule controller is linked to this lock detect circuit, and this locking time schedule controller is used to modulate this lock detect circuit, by adjusting continuous ground actuating motor between this power drive signal.

According to another aspect of the present invention, the motor drive circuit of a kind of tool from dynamic(al) correction speed-frequency function is provided, this drive circuit comprises at least:

One speed control unit, has a detection signal input, an one tach signal input and a modulating signal output, utilize this detection signal input and this tach signal input simultaneously, import this detection signal and this tach signal respectively to form a phase signal, mode by pulse width modulation forms the pulse width modulation signal that can modulate the driving time ratio, wherein this pulse width modulation signal is corresponding to this phase signal between this detection signal and this tach signal, and this pulse width modulation signal is in real time corresponding to the actual speed frequency of motor;

One drive unit, have one first power take-off, one second power take-off and a signal input part, wherein this first power take-off and this second power take-off are coupled respectively to motor winding, this drive unit has plurality of transistors to produce a power drive signal, and utilize this checkout gear to produce a correct detection signal, and this correct detection signal is fed back to this speed control unit immediately, form closed-loop path control, with the speed-frequency of automatic correcting motor; And

One drives time schedule controller, be coupled respectively to this modulating signal output and this signal input part of this speed control unit, this driving time schedule controller receives this pulse width modulation signal, and utilize a plurality of switch modules to produce a timing control signal, to control the output timing of this power drive signal, avoid the drive unit short circuit simultaneously.

According to another aspect of the present invention, a kind of motor drive circuit of tool automatic setting speed-frequency function is provided, this drive circuit comprises at least:

One frequency generator cooperates and utilizes oscillator to make this frequency generator produce a speed-frequency setting signal, and this frequency generator has:

One resistor has one first end and one second end, and this first end is linked to power supply, and this second end is used to export this speed-frequency setting signal; And

One capacitor has one the 3rd end and one the 4th end, and the 3rd end is linked to this second end, the 4th end ground connection;

One speed control unit, have a detection signal input, a speed-frequency set input and a modulating signal output, this speed-frequency set input is coupled to this second end of this resistor, utilize this detection signal input and this speed-frequency setting signal input simultaneously, import this detection signal and this speed-frequency setting signal respectively, with the rotating speed specification frequency of automatic setting motor;

One drive unit, have one first power take-off, one second power take-off and a signal input part, wherein this first power take-off and this second power take-off are coupled respectively to motor winding, and this drive unit has plurality of transistors to produce a power drive signal; And

One drives time schedule controller, be coupled respectively to this modulating signal output and this signal input part of this speed control unit, and utilize a plurality of switch modules to produce a timing control signal, to control the output timing of this power drive signal, avoid the drive unit short circuit simultaneously.

According to another aspect of the present invention, a kind of method of speed-frequency of automatic correcting motor drive circuit is provided, this method comprises the following step:

Import a detection signal and a tach signal, wherein this detection signal produces with a checkout gear;

Utilize a speed control unit to receive this detection signal and this tach signal simultaneously to form a phase signal, and form the pulse width modulation signal that can modulate the driving time ratio in the mode of pulse width modulation, wherein this pulse width modulation signal is corresponding to this phase signal between this detection signal and this tach signal;

Use a drive unit to produce a power drive signal, speed-frequency with automatic correcting motor, wherein use a driving time schedule controller to receive this pulse width modulation signal, produce the output timing that a timing control signal is controlled this power drive signal, to avoid the drive unit short circuit; And

Detect the actual speed frequency of motor in real time with this checkout gear, and produce a correct detection signal, and this correct detection signal is fed back to this speed control unit immediately, to form closed-loop path control.

According to another aspect of the present invention, a kind of method of speed-frequency of automatic setting motor drive circuit is provided, this method comprises the following step:

Form a speed-frequency setting signal and a detection signal, utilize a frequency generator to form this speed-frequency setting signal, and a transducer produces this detection signal;

Utilize a speed control unit to receive this detection signal and this speed-frequency setting signal simultaneously, to form a phase signal, and form the pulse width modulation signal that can modulate the driving time ratio in the mode of pulse width modulation, wherein this pulse width modulation signal is corresponding to this phase signal between this detection signal and this speed-frequency setting signal; And

Use a drive unit to produce a power drive signal, speed-frequency with the automatic setting motor, wherein use a driving time schedule controller to receive this pulse width modulation signal, produce the output timing that a timing control signal is controlled this power drive signal, to avoid the drive unit short circuit.

In a word, the present invention discloses tool frequency setting and correcting electric machine driving circuit and method thereof, produce the actual speed frequency of a speed-frequency setting signal with setting and correcting motor, structural failure when making in order to compensated motor, and use back motor speed frequency drift error.Hereat, the present invention effectively promotes the fine ratio of product of motor, can guarantee that more motor operates running under constant rotational speed, prevents that the speed-frequency of motor from producing drift, avoids motor to produce noise, vibration, and then the operational stability of maintenance system.

Description of drawings

Figure 1A is the drive circuit calcspar of traditional brushless d.c. motor;

Figure 1B is the driving method flow chart of traditional brushless d.c. motor;

Fig. 2 A is a motor drive circuit calcspar of the present invention;

Fig. 2 B is the method flow diagram of motor drive circuit of the present invention;

Fig. 3 A is a speed control unit of the present invention;

Fig. 3 B is the sequential chart of speed control unit of the present invention;

Fig. 3 C is the application circuit of level generator of the present invention;

Fig. 3 D is the application circuit of sawtooth generator of the present invention;

4A-4C figure is first embodiment of drive unit of the present invention;

4D-4E figure is second embodiment of drive unit of the present invention;

Fig. 5 is a locking time schedule controller of the present invention; And

Fig. 6 is the embodiment of the speed-frequency of automatic setting motor drive circuit of the present invention.

The implication of each Reference numeral in the accompanying drawing is described as follows:

100 controllers, 102 controllers

104 rotor magnets, 102 controllers

200 speed control units, 202 drive units

204 drive time schedule controller 206 lock detect circuits

208 locking time schedule controllers, 210 frequency processing devices

212 tach signal inputs, 214 detection signal inputs

216 first power take-offs, 218 second power take-offs

220 signal input parts, 222 pulse width modulation signal output parts

300 first comparators, 302 level generators

304 sawtooth generators, 306 second comparators

308 first outputs, 310 second outputs

312 level output ends, 314 sawtooth waveforms outputs

320 the first transistors, 322 transistor secondses

324 resistors, 326 capacitors

340 resistors, 342 capacitors

344 transistors

400 the first transistors, 402 transistor secondses

404 the 3rd transistors 406 the 4th transistor

408 unicoils, 410 first comparators

412 second comparators, 414 inverters

416 comparators, 418 transistors

420 first coils, 422 second coils

424 the first transistors, 426 transistor secondses

428 first coils, 430 second coils

432 the first transistors, 434 transistor secondses

600 frequency generators, 602 resistors

604 capacitors, 606 speed-frequency setting signal outputs

Embodiment

The disappearance that the present invention is directed to prior art provides total solution.Now with figures support combinations in detail, tool frequency setting and correcting electric machine driving circuit and method thereof are described in detail.Motor drive circuit of the present invention is mainly used in the brushless d.c. motor, also is applicable to the motor of the different coil numbers of poles of control simultaneously, for example the motor of four utmost points, sextupole, the ends of the earth, 12 utmost points or higher number of poles.Generally speaking, the coil number of poles is directly proportional with the shaft horsepower of motor, that is the high more shaft horsepower of number of poles is big more.Specific, motor drive circuit can be applicable to unicoil brushless d.c. motor, and twin coil brushless d.c. motor.

At first see also Fig. 2 A, it represents motor drive circuit calcspar of the present invention.Motor drive circuit comprises speed control unit 200, drive unit 202 at least, drives time schedule controller 204, lock detect circuit 206, locking time schedule controller 208 and frequency processing device 210.Speed control unit 200 has detection signal input 214, tach signal input 212 and pulse width modulation signal output part 222, utilize detection signal input 214 and tach signal input 212 simultaneously, import detection signal (Hin) and tach signal (SC) respectively to form phase signal, form by the mode of pulse width modulation again and can modulate the pulse width modulation signal (PWM) of driving time than (Duty Ratio), wherein the pulse width modulation signal is corresponding to the phase signal between detection signal and tach signal, and the pulse width modulation signal can be in real time corresponding to the actual speed frequency of motor.

Consult 3A-3B figure, it represents speed control unit of the present invention and sequential chart thereof respectively.In the preferred embodiment of the present invention, speed control unit 200 comprises first comparator 300, level generator 302, sawtooth generator 304 and second comparator 306.In the sequential chart of speed control unit 200, (A) be the output waveform of detection signal (Hin), show the actual speed of motor; (B) be the output waveform of tach signal (SC), show the specification rotating speed or the speed-frequency setting of motor; (C) be the output waveform of sawtooth signal (Vsaw) and level signal (Vref); (D) be the output waveform of pulse width modulation signal (PWM), corresponding to the phase difference of detection signal and tach signal.

Specifically, first comparator 300 has detection signal input 214, tach signal input 212, first output 308 and second output 310, first comparator 300 utilizes detection signal input 214 and tach signal input 212 to import detection signal and tach signal respectively to form phase signal simultaneously, wherein detection signal is corresponding to the actual speed frequency of motor, tach signal is corresponding to the specification speed-frequency or the foreign frequency of motor, and checkout gear (end indicates) is installed on motor interior or the motor circuit external plate.In addition, checkout gear for example can be Hall (Hall) transducer or other magnetic field detection assembly, first comparator 300 can be or door (OR Gate), NOR gate (NOR Gate), with door (AND Gate), a NAND gate (NAND Gate), phase-locked loop (PLL), counter (Counter) with and any of combination.

Consult Fig. 3 C, the application circuit of its expression level generator of the present invention.In preferred embodiment, level generator 302 comprises the first transistor 320, transistor seconds 322, resistor 324 and capacitor 326 at least.The first transistor 320 has source electrode, grid and drain electrode, and source electrode is connected to power supply, and grid is connected to first output 308.Transistor seconds 322 has source electrode, grid and drain electrode, and source electrode is connected to the drain electrode of the first transistor, and grounded drain, grid are linked to second output 310.Resistor 324 has first end and second end, and first end is connected to the drain electrode of the first transistor, and second end is a level output end 312, forms level signal to utilize phase signal.Capacitor 326 has first end and second end, and first end is linked to level output end 312, the second end ground connection.Wherein the first transistor 320 for example can be field-effect transistor or bipolarity junction transistor with transistor seconds 322.

Consult Fig. 3 D, the application circuit of its expression sawtooth generator of the present invention.In the preferred embodiment of the present invention, sawtooth generator comprises resistor 340, capacitor 342 and transistor 344 at least.First end of resistor 340 is coupled to power supply (Vcc), and second end is coupled to sawtooth waveforms output 314.First end of capacitor 342 is coupled to sawtooth waveforms output 314, the second end ground connection (GND).Transistor 344 is coupled between sawtooth waveforms output 314 and the earth terminal GND, and has control end.

See also Fig. 3 A.Second comparator 306 has level input 312, reference input 314 and pulse width modulation signal output part 222, level input 312 is linked to level output end 312 and sawtooth waveforms output 314 respectively with reference input 314, second comparator 306 receives sawtooth signal and level signal simultaneously, mode by pulse width modulation, be benchmark with the level signal and sawtooth waveforms carried out modulation, to form the pulse width modulation signal that to modulate the driving time ratio.

Consult 4A-4C figure, first embodiment of its expression drive unit of the present invention.The drive unit 202 of Fig. 2 A has first power take-off 216, second power take-off 218 and signal input part 220, wherein first power take-off 216 and second power take-off are coupled respectively to motor winding, and signal input part 220 is coupled to driving time schedule controller 204, drive unit 202 has plurality of transistors with tight living power drive signal, and utilize checkout gear to produce rotating speed after the correct detection input is proofreaied and correct, and will proofread and correct detection signal and feed back (Feedback) immediately to speed control unit 200, form closed-loop path (Close Loop) control, with the speed-frequency of automatic correcting motor.

In one embodiment of the invention, shown in Fig. 4 A, has unicoil 408, and unicoil 408 has first end and second end, and drive unit 202 comprises the first transistor 400, transistor seconds 402, the 3rd transistor 404 and the 4th transistor 406 at least, has source electrode, grid and drain electrode respectively.In the first transistor 400, source electrode is connected to power supply VCC, and drain electrode is first power take-off 216 and first end that is linked to unicoil 408, and grid is connected to and drives time schedule controller 204.In the transistor seconds 402, source electrode is connected to earth terminal GND, and drain electrode is first end that second power take-off 216 is linked to unicoil 408, and grid is connected to the driving time schedule controller.Principal character is the not conducting simultaneously of the first transistor 400 and transistor seconds 402.

Secondly, in the 3rd transistor 404, source electrode is linked to earth terminal GND, and drain electrode is second end that second power take-off 218 is linked to unicoil 408, and gate coupled is to driving time schedule controller 204.In the 4th transistor 406, source electrode is connected to power supply VCC, drain electrode is second power take-off 218 and is coupled to monocoil second end, and grid is connected to and drives time schedule controller 204, and principal character is the 3rd transistor 404 and the not conducting simultaneously of the 4th transistor 406.

In the another embodiment of the present invention, shown in Fig. 4 B.Motor has unicoil 408, and unicoil 408 has first end and second end is connected to first power take-off 216 and second power take-off 218 respectively, and drive unit 202 comprises first comparator 410, second comparator 412 and an inverter 414 at least, have two inputs and an output respectively, wherein the voltage of the negative input end of inverter 414 is VDD/2, and positive input terminal is level signal (Vref).Supply voltage among this embodiment is a fixed value, has lower power consumption.

In the another embodiment of the present invention, shown in Fig. 4 C.Motor has unicoil 408, and unicoil 408 has first end and second end is connected to first output 216 and second output 218 respectively, and drive unit 202 comprises four transistors 418 at least, have source electrode, grid and drain electrode respectively, the negative input end that first end of unicoil 408 and second end are connected to four comparators 416 respectively uses as feedback.

Consult Fig. 4 D, second embodiment of drive unit of the present invention.Motor has first coil 420 and second coil 422, and an end of first coil 420 and second coil 422 is coupled to power supply VCC simultaneously, the other end of first coil 420 and second coil 422 then is coupled respectively to first power take-off 216 and second power take-off 218, drive unit 202 comprises the first transistor 424 and transistor seconds 426 at least, has source electrode, grid and drain electrode respectively.In the first transistor 424, source electrode is connected to earth terminal GND, and drain electrode is the other end that second power take-off 218 is linked to first coil 420, and grid is connected to and drives time schedule controller 204.Transistor seconds 426, source electrode are connected to earth terminal GND, and drain electrode is the other end that second power take-off 218 is connected to second coil 422, and grid is connected to and drives time schedule controller 204.

In one embodiment of the invention, shown in Fig. 4 E.Motor has first coil 428 and second coil 430, and an end of first coil 428 and second coil 430 is coupled to power supply VCC simultaneously, drive unit 202 comprises the first transistor 432 and transistor seconds 434 at least, has source electrode, grid and drain electrode respectively.Among this embodiment, be used for the voltage of drive motor can and change, so can make rotor produce more smooth-going rotation during the number of poles of switching motor, vibrate to avoid motor along with the change of the height of load.

Please consult Fig. 2 A again, drive pulse width modulation signal output part 222 and drive unit 202 that time schedule controller 204 is coupled respectively to speed control unit 200.When operating, drive time schedule controller 204 received pulse width modulation signals, and utilize a plurality of switch modules to produce timing control signal,, avoid the drive unit short circuit simultaneously with the output timing of power controlling drive signal.

Consult Fig. 5, the sequential chart of its expression lock detect circuit of the present invention.Lock detect circuit 206 is linked to and drives time schedule controller 204, lock detect circuit 206 is used to detect the blocking that motor rotor is subjected to external force, when rotor is locked, produce locking detection signal (HL), motor can shut down operation to reduce the consumption of power supply.Drive time schedule controller 204 and be linked to lock detect circuit 206, be used to modulate lock detect circuit 206, by adjusting the driving time ratio, to produce a power drive signal (SL), with a continuous ground actuating motor, preferable startup/dwelling period time (T) is than being about 0.125: 0.875.

Frequency processing device 210 is coupled respectively to detection signal input 214 and lock detect circuit 206, and frequency processing device 210 receives detection signal, and utilizes detection signal to carry out frequency and convert.During practical application, because the difference of motor winding number of poles, so the detection signal that receives must remove a numeral, for example 1,1.5,2,2.5,3 and 3.5 etc., correctly to meet the rotational frequency of motor.In addition, when motor stopped operating, frequency processing device 210 will be exported a high potential (Pull High) signal, to show that motor is in the state that shuts down.

Consult Fig. 6, the embodiment of the speed-frequency of its expression automatic setting motor drive circuit of the present invention.The speed-frequency setting signal of motor can be provided by the frequency generator 600 of outside, and the RC peripheral circuit that for example utilizes resistance and electric capacity to form produces a stable frequency and sets as speed-frequency.In the preferred embodiment of the present invention, utilize frequency generator 600 to cooperate oscillator (not indicating) to form a speed-frequency setting signal, frequency generator 600 comprises resistor 602 and capacitor 604 at least, wherein first end of resistor 602 is linked to power supply, second end of resistor 602 and first end of capacitor 604 join, and second end of resistor 602 is speed-frequency setting signal output 606, and the second end ground connection of capacitor 604.

Particularly when making the motor of different rotating speeds specification, can utilize the stator coil of identical coil turn structure, see through frequency generator 600 and set the rotating speed specifications, have identical but the motor that the rotating speed specification is different of coil turn to produce.Owing to do not need extra parameter setting to produce the different stator coil of coil turn, so to the very big effect of simplification generation of the whole manufacturing process of motor.

Consult Fig. 2 B, the method flow diagram of its expression motor drive circuit of the present invention.When operating, in step 250, at first import detection signal and tach signal, wherein this detection signal produces with checkout gear.In step 252, then utilize speed control unit to receive detection signal and tach signal simultaneously forming phase signal, and form the pulse width modulation signal that to modulate the driving time ratio in the mode of pulse width modulation.In step 254, use drive unit to produce the power drive signal afterwards, with the speed-frequency of automatic correcting motor, wherein use to drive time schedule controller received pulse width modulation signal, produce the output timing of timing control signal power controlling drive signal.At last, in step 256, detect the actual speed frequency of motor in real time with this checkout gear, and produce the correct detection signal, and will proofread and correct detection signal and feed back (Feedback) immediately, to form closed-loop path control to speed control unit.

In step 258, use locking time schedule controller control lock detect circuit, if motor is an operating condition, then direct execution in step 252, if motor is a blocking, then produce timing control signal, see through step 254 a continuous ground actuating motor again, reach the function that reduces electrical source consumption with the locking time schedule controller.In step 256, utilize the frequency processing device to receive detection signal to implement frequency conversion step.

In sum, the present invention discloses tool frequency setting and correcting electric machine driving circuit and method thereof, produce the actual speed frequency of a speed-frequency setting signal with setting and correcting motor, structural failure when making in order to compensated motor, and use back motor speed frequency drift error.Hereat, the present invention effectively promotes the fine ratio of product of motor, can guarantee that more motor operates running under constant rotational speed, prevents that the speed-frequency of motor from producing drift, avoids motor to produce noise, vibration, and then the operational stability of maintenance system.

The present invention with preferred embodiment as above; only be used for helping to understand enforcement of the present invention; non-in order to limit spirit of the present invention; and those of ordinary skills are after comprehension spirit of the present invention; in not breaking away from spiritual scope of the present invention; when the variation that can do a little change retouching and be equal to is replaced, its scope of patent protection is when deciding with accompanying claims and equivalent thereof.

Claims

1. a tool is from the motor drive circuit of dynamic(al) correction speed-frequency function, and this drive circuit comprises at least:

2. tool as claimed in claim 1 is from the motor drive circuit of dynamic(al) correction speed-frequency function, and wherein this speed control unit comprises at least:

One first comparator, has this detection signal input, this tach signal input, one first output and one second output, this first comparator utilizes this detection signal input and this tach signal input simultaneously, import this detection signal and this tach signal respectively to form this phase signal, wherein this detection signal is corresponding to the actual speed frequency of motor, this tach signal is corresponding to the specification speed-frequency of motor, and utilize a checkout gear to obtain this detection signal, wherein this checkout gear is installed on motor interior or motor outside;

One level generator, have a first input end, one second input and a level output end, this first input end and this second input are coupled respectively to this first output and this second output, and this level generator optionally receives and handle this phase signal to produce a level signal;

One sawtooth generator has a sawtooth waveforms output, and this sawtooth generator is used to produce a sawtooth signal; And

One second comparator, have a level input, a reference input and a modulating signal output, this level input and this reference input are linked to this level output end and this sawtooth waveforms output respectively, this second comparator receives this sawtooth signal and this level signal simultaneously, mode by pulse width modulation, be benchmark and this sawtooth waveforms carried out modulation with this level signal, to form this pulse width modulation signal that to modulate the driving time ratio.

3. tool as claimed in claim 2 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein this first comparator be selected from or gate logic arithmetic unit, NOR gate logical-arithmetic unit, with one of gate logic arithmetic unit, NAND gate logical-arithmetic unit and aforementioned logical-arithmetic unit combination in any group.

4. tool as claimed in claim 2 is from the motor drive circuit of dynamic(al) correction speed-frequency function, and wherein this first comparator is phase-locked loop (PLL).

5. tool as claimed in claim 2 is from the motor drive circuit of dynamic(al) correction speed-frequency function, and wherein this first comparator is a counter.

6. tool as claimed in claim 2 is from the motor drive circuit of dynamic(al) correction speed-frequency function, and wherein this checkout gear comprises Hall element or field resistance at least.

7. tool as claimed in claim 2 is from the motor drive circuit of dynamic(al) correction speed-frequency function, and wherein this level generator comprises at least:

One the first transistor has one first source electrode, a first grid and one first drain electrode, and this first source electrode is linked to power supply, and this first grid is linked to this first output;

One transistor seconds has one second source electrode, a second grid and one second drain electrode, and this second source electrode is linked to this first drain electrode, and this second grounded drain, this second grid are linked to this second output;

One resistor has one first end and one second end, and this first end is linked to this first drain electrode, and this second end is this level output end, forms this level signal to utilize this phase signal; And

One capacitor has one first end and one second end, and this first end is linked to this level output end, this two ends ground connection.

8. tool as claimed in claim 7 is from the motor drive circuit of dynamic(al) correction speed-frequency function, and wherein this first transistor is one of field-effect transistor or bipolarity junction transistor.

9. tool as claimed in claim 7 is from the motor drive circuit of dynamic(al) correction speed-frequency function, and wherein this transistor seconds is one of field-effect transistor or bipolarity junction transistor.

10. tool as claimed in claim 2 is from the motor drive circuit of dynamic(al) correction speed-frequency function, and wherein this sawtooth generator comprises at least:

One resistor has one first end and one second end, and this first end is coupled to power supply, and this second end is linked to this sawtooth waveforms output; And

One capacitor has one first end and one second end, and this first end is coupled to this sawtooth waveforms output, this second end ground connection; And

One transistor is coupled between this sawtooth waveforms output and the earth terminal, and has control end.

11. tool as claimed in claim 1 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein motor is for having unicoil, and unicoil has first end and second end, and this drive unit comprises at least:

One the first transistor, have one first source electrode, a first grid and one first drain electrode, this first source electrode is linked to power supply, and this first drain electrode is first power take-off and is coupled to monocoil first end that this first grid is linked to this driving time schedule controller;

One transistor seconds, have one second source electrode, a second grid and one second drain electrode, this second source-coupled is to earth terminal, this second drain electrode is linked to monocoil first end for this second power take-off, this second grid is linked to this driving time schedule controller, wherein not conducting simultaneously of this first transistor and this transistor seconds;

One the 3rd transistor, have one the 3rd source electrode, one the 3rd grid and one the 3rd drain electrode, the 3rd source-coupled is to earth terminal, and the 3rd drain electrode is linked to monocoil second end for this second power take-off, and the 3rd grid is linked to this driving time schedule controller; And

One the 4th transistor, have one the 4th source electrode, one the 4th grid and one the 4th drain electrode, the 4th source electrode is linked to power supply, the 4th drain electrode is coupled to monocoil second end for this second power take-off, the 4th grid is linked to this driving time schedule controller, wherein not conducting simultaneously of the 3rd transistor and the 4th transistor.

12. tool as claimed in claim 1 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein motor has first coil and second coil, and an end of first coil and second coil is coupled to this power supply simultaneously, and this drive unit comprises at least:

One the first transistor has one first source electrode, a first grid and one first drain electrode, and this first source electrode is linked to earth terminal, and this first drain electrode is first power take-off and the other end that is linked to first coil, and this first grid is linked to the driving time schedule controller; And

One transistor seconds has one second source electrode, a second grid and one second drain electrode, and this second source electrode is linked to earth terminal, and this second drain electrode is the other end that second power take-off is linked to second coil, and this second grid is linked to the driving time schedule controller.

13. tool as claimed in claim 1 from the motor drive circuit of dynamic(al) correction speed-frequency function, also comprises a frequency generator, cooperates oscillator to produce a speed-frequency setting signal, this frequency generator comprises at least:

One capacitor has one the 3rd end and one the 4th end, and the 3rd end is linked to this second end, the 4th end ground connection.

14. tool as claimed in claim 1 is from the motor drive circuit of dynamic(al) correction speed-frequency function, also comprise a frequency processing device, be coupled respectively to this detection signal input and this lock detect circuit, this frequency processing device receives this detection signal, and utilizes this detection signal to carry out frequency and convert.

15. a tool is from the motor drive circuit of dynamic(al) correction speed-frequency function, this drive circuit comprises at least:

16. tool as claimed in claim 15 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein this speed control unit comprises at least:

One second comparator, have a first input end, one second input and a modulating signal output, this first input end and this second input are linked to this sawtooth waveforms output and this level output end respectively, this second comparator receives this sawtooth signal and this level signal simultaneously, mode by pulse width modulation, be benchmark and this sawtooth signal carried out modulation with this level signal, to form this pulse width modulation signal that to modulate the driving time ratio.

17. tool as claimed in claim 16 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein this first comparator be selected from or gate logic arithmetic unit, NOR gate logical-arithmetic unit, with gate logic arithmetic unit, NAND gate logical-arithmetic unit and aforementioned logical-arithmetic unit combination in any in one of group.

18. tool as claimed in claim 16 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein this first comparator is phase-locked loop (PLL).

19. tool as claimed in claim 16 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein this first comparator is a counter.

20. tool as claimed in claim 16 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein this checkout gear comprises Hall element or field resistance at least.

21. tool as claimed in claim 16 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein this level generator comprises at least:

22. tool as claimed in claim 21 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein this first transistor is one of field-effect transistor or bipolarity junction transistor.

23. tool as claimed in claim 21 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein this transistor seconds is one of field-effect transistor or bipolarity junction transistor.

24. tool as claimed in claim 16 is from the motor drive circuit of dynamic(al) correction speed-frequency function, wherein this sawtooth generator comprises at least:

One capacitor has one the 3rd end and one the 4th end, and the 3rd end is coupled to this sawtooth waveforms output, the 4th end ground connection; And

25. the motor drive circuit of a tool automatic setting speed-frequency function, this drive circuit comprises at least:

26. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 25, wherein this speed control unit comprises at least:

One first comparator, have this detection signal input, this speed-frequency set input, one first output and one second output, this first comparator utilizes this detection signal input and this speed-frequency set input simultaneously, importing this detection signal and this speed-frequency respectively sets, wherein this detection signal is corresponding to the actual speed frequency of motor, this speed-frequency is set the specification speed-frequency corresponding to motor, and utilize a checkout gear to obtain this detection signal, wherein this checkout gear is installed on motor interior or motor outside;

One level generator has a first input end, one second input and a level output end, and this first input end and this second input are coupled respectively to this first output and this second output, and this level generator is used to produce a level signal;

One second comparator, have a first input end, one second input and a modulating signal output, this first input end and this second input are linked to this sawtooth waveforms output and this level output end respectively, this second comparator receives this sawtooth signal and this level signal simultaneously, mode by pulse width modulation, be benchmark and this sawtooth waveforms carried out modulation with this level signal, to form this pulse width modulation signal that to modulate the driving time ratio.

27. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 26, wherein this first comparator be selected from or gate logic arithmetic unit, NOR gate logical-arithmetic unit, with gate logic arithmetic unit, NAND gate logical-arithmetic unit and aforementioned logical-arithmetic unit combination in any in one of group.

28. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 26, wherein this first comparator is phase-locked loop (PLL).

29. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 26, wherein this first comparator is a counter.

30. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 26, wherein this checkout gear comprises Hall element or field resistance at least.

31. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 26, wherein this level generator comprises at least:

32. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 31, wherein this first transistor is one of field-effect transistor or bipolarity junction transistor.

33. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 31, wherein this transistor seconds is one of field-effect transistor or bipolarity junction transistor.

34. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 26, wherein this sawtooth generator comprises at least:

35. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 25, wherein motor is a unicoil, and unicoil has first end and second end, and this drive unit comprises at least:

One the first transistor, have one first source electrode, a first grid and one first drain electrode, this first source electrode is linked to this power supply supply, and this first drain electrode is first power take-off and is coupled to monocoil first end that this first grid is linked to this driving time schedule controller;

One transistor seconds, have one second source electrode, a second grid and one second drain electrode, this second source-coupled is to earth terminal, and this second drain electrode is for this first power take-off and be coupled to this monocoil this first end, and this second grid is linked to this driving time schedule controller;

One the 3rd transistor, have one the 3rd source electrode, one the 3rd grid and one the 3rd drain electrode, the 3rd source-coupled is to earth terminal, the 3rd drain electrode is for this second power take-off and be coupled to this monocoil this second end, the 3rd grid is linked to this driving time schedule controller, and wherein the conducting simultaneously of this first transistor and the 3rd transistor is to produce first drive current; And

One the 4th transistor, have one the 4th source electrode, one the 4th grid and one the 4th drain electrode, the 4th source electrode is linked to this power supply supply, the 4th drain electrode is for this second power take-off and be coupled to monocoil second end, the 4th grid is linked to this driving time schedule controller, wherein the conducting simultaneously of this transistor seconds and the 4th transistor is to produce one second drive current, and this first drive current and this second drive current do not produce simultaneously, and this first drive current and this second drive current correspond respectively to the rotation direction of motor.

36. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 25, wherein motor has first coil and second coil, and an end of first coil and second coil is coupled to this power supply supply simultaneously, and this drive unit comprises at least:

One the first transistor, have one first source electrode, a first grid and one first drain electrode, this first source electrode is linked to this earth terminal, and this first drain electrode is this first power take-off and this second end that is coupled to this first coil, and this first grid is linked to the driving time schedule controller; And

One transistor seconds, have one second source electrode, a second grid and one second drain electrode, this second source electrode is linked to this earth terminal, and this second drain electrode is this second power take-off and this second end that is coupled to this second coil, and this second grid is linked to the driving time schedule controller.

37. the motor drive circuit of tool automatic setting speed-frequency function as claimed in claim 25 also comprises:

One lock detect circuit is linked to this driving time schedule controller, and this lock detect circuit is used to detect the blocking that motor rotor is subjected to external force, and when rotor was locked, motor can shut down operation to reduce the consumption of power supply;

One locking time schedule controller is linked to this lock detect circuit, and this locking time schedule controller is used to modulate this lock detect circuit, by adjusting this power drive signal, with a continuous ground actuating motor; And

One frequency processing device is coupled respectively to this detection signal input and this lock detect circuit, and this frequency processing device receives this detection signal, and utilizes this detection signal to carry out frequency and convert.

38. the method for the speed-frequency of an automatic correcting motor drive circuit, this method comprises the following step:

39. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 38, wherein the method for operation of this speed control unit comprises the following step at least:

Utilize one first comparator side by side to receive this detection signal and this tach signal, to form this phase signal, wherein this detection signal is corresponding to the actual speed frequency of motor, this tach signal is corresponding to the specification speed-frequency of motor, and this checkout gear is installed on motor interior or motor outside;

Utilize a level generator optionally to receive and handle this phase signal, to produce a level signal;

Utilize a sawtooth generator to produce a sawtooth signal; And

Utilize one second comparator to receive this sawtooth signal and this level signal simultaneously, by the mode of pulse width modulation, be benchmark and this sawtooth waveforms carried out modulation, to form this pulse width modulation signal that to modulate the driving time ratio with this level signal.

40. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 39, wherein this first comparator be selected from or gate logic arithmetic unit, NOR gate logical-arithmetic unit, with gate logic arithmetic unit, NAND gate logical-arithmetic unit and aforementioned logical-arithmetic unit combination in any in one of group.

41. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 39, wherein this first comparator is phase-locked loop (PLL).

42. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 39, wherein this first comparator is a counter.

43. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 39, wherein this checkout gear comprises Hall element or field resistance at least.

44. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 38, this drive unit that wherein produces in the step of this power drive signal comprises the first transistor, transistor seconds, the 3rd transistor and the 4th transistor at least.

45. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 44, wherein not conducting simultaneously of this first transistor and this transistor seconds.

46. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 44, wherein not conducting simultaneously of the 3rd transistor and the 4th transistor.

47. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 38, wherein motor is the twin coil pattern.

48. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 38, also comprise the blocking that detects motor, use a locking time schedule controller to control a lock detect circuit,, reach the function that reduces electrical source consumption with a continuous ground actuating motor.

49. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 38 also comprises and carries out a frequency conversion step, utilizes a frequency processing device to receive this detection signal to implement this frequency conversion step.

50. the method for the speed-frequency of automatic correcting motor drive circuit as claimed in claim 49, wherein be somebody's turn to do in the step of the blocking that detects motor rotor, this frequency processing device is exported a high potential signal, to show that motor is in the state that shuts down.

51. the method for the speed-frequency of an automatic setting motor drive circuit, this method comprises the following step:

52. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 51, this frequency generator that wherein produces this speed-frequency setting signal comprises at least:

53. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 51, also comprise real-time generation one correct detection signals step, utilize this checkout gear to detect the actual speed frequency of motor, and this correct detection signal is fed back to this speed control unit immediately, to form closed-loop path control.

54. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 51, wherein the method for operation of this speed control unit comprises the following step at least:

Utilize one first comparator side by side to receive this detection signal and this speed-frequency setting signal, to form this phase signal, wherein this detection signal is corresponding to the actual speed frequency of motor, this speed-frequency setting signal is corresponding to the specification speed-frequency of motor, and utilize a checkout gear to obtain this detection signal, wherein this checkout gear is installed on motor interior or motor outside;

Utilize a level generator optionally to receive and handle this phase signal to produce a level signal;

Utilize a sawtooth generator to produce a sawtooth signal; And

55. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 52, wherein this first comparator be selected from or gate logic arithmetic unit, NOR gate logical-arithmetic unit, with gate logic arithmetic unit, NAND gate logical-arithmetic unit and aforementioned logical-arithmetic unit combination in any in one of group.

56. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 52, wherein this first comparator is phase-locked loop (PLL).

57. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 52, wherein this first comparator is a counter.

58. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 52, wherein this checkout gear comprises Hall element or field resistance at least.

59. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 51, this drive unit that wherein forms in the step of this power drive signal comprises the first transistor, transistor seconds, the 3rd transistor and the 4th transistor at least.

60. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 57, wherein not conducting simultaneously of this first transistor and this transistor seconds.

61. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 57, wherein not conducting simultaneously of the 3rd transistor and the 4th transistor.

62. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 51, wherein motor is the twin coil pattern.

63. the method for the speed-frequency of automatic setting motor drive circuit as claimed in claim 51 also comprises and utilizes this detection signal to carry out the step that frequency converts, and receives this detection signal line frequency of going forward side by side with a frequency processing device and converts.