CN103312260B - There is the motor drive of minimum speed and maximum speed setting - Google Patents
There is the motor drive of minimum speed and maximum speed setting Download PDFInfo
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- CN103312260B CN103312260B CN201210064776.0A CN201210064776A CN103312260B CN 103312260 B CN103312260 B CN 103312260B CN 201210064776 A CN201210064776 A CN 201210064776A CN 103312260 B CN103312260 B CN 103312260B
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Abstract
The invention discloses a kind of motor drive.This motor drive to after the setting of motor rotary speed, makes motor may operate in minimum speed or maximum speed by different external circuits; Motor operated in minimum speed time, for avoiding when the pulse period of PWM drive singal is less than motor minimum work moment (torque), cause motor to stop operating, control mode keeps the requirement of minimum heat radiation and takes into account energy-conservation effectiveness whereby; Motor operated in maximum speed time, can under identical motor load, reach the highest rotating speed application, to reach the demand of heat radiation.In addition, when motor operated at minimum speed or maximum speed time, be not subject to the impact of the PWM drive singal that external system provides completely; Further increase the flexibility ratio of motor applications whereby.
Description
Technical field
The invention relates to a kind of drive unit of motor, relate to a kind of motor drive with minimum speed and maximum speed setting especially, it adjusts the electric current of input by an external circuit, export to produce a fixing speed setting, synchronous computing is done again by pwm pulse signal, make motor operated when minimum speed and maximum speed setting, can not change along with PWM input signal makes, further increase the flexibility ratio of motor applications whereby; In addition, motor drive of the present invention can be used in single-phase motor and three-phase motor.
Background technology
In recent years, personal computer (Personal Computer, PC), pocket computer (PortableComputer/Note-Boob, or the rapid development of work station (Work Station) NB), the running speed of compute chip is made to increase rapidly, such as: CPU (Central ProcessorUnit, CPU), digital signal processor (Digital Signal Processor, DSP).Therefore, along with the increase of chip arithmetic speed, also make frequency gets higher, cause chip to produce a large amount of heat.But high heat can cause following problem: cause chip computing abnormal, or have an impact to peripheral circuits.Therefore, the heat sinking function of chip becomes extremely important technology.
First, as shown in Figure 1, general in the mode driven with pwm motor, all in a linear fashion along with the supply power cycle (duty cycle) of PWM increases the rotating speed of motor sequentially, therefore, it cannot reach the function of minimum speed setting and (or) setting the most at a high speed according to the demand of reality.Such as, under identical motor load, in order to reach minimum cooling requirements and reduce motor reset produced noise, noise time, usually power cycle is supplied at PWM low to (such as: 20%duty cycle) after certain value, namely can wish that motor can be fixed on a rotating speed, and want not change rotating speed along with PWM supplies power cycle change; Meanwhile, also not when the output that PWM supplies power cycle is less than motor minimum work moment (torque), motor is caused to stop operating; Control mode keeps the requirement of minimum heat radiation whereby.Clearly, now motor drive just needs the function of minimum speed setting, maintains the minimum work moment of motor.
In addition, under same motor load, if when being applied in different radiating modules, the for example radiating module of display adapter, heat-sinking capability needed for it does not need to require high as CPU radiating module, in order to reach heat radiation and energy-conservation balance point, the radiating module that most likely redesign one is new.But, if when motor drive can provide the setting of a maximum speed, then under identical motor load, just the application of its highest rotating speed can be set, to reach the demand of heat radiation, and take into account energy-conservation effectiveness, further increase the flexibility ratio of motor applications whereby.
Summary of the invention
According to the restriction situation of mode in practical operation that the pwm motor existing for prior art drives, a main purpose of the present invention is providing a kind of motor drive with minimum speed setting, by an external circuit to after the setting of motor rotary speed, motor is made to may operate in minimum speed, when the pulse period of PWM drive singal is less than motor minimum work moment (torque), motor is caused to stop operating for avoiding; Control mode keeps the requirement of minimum heat radiation whereby.
Another main purpose of the present invention is to provide a kind of motor drive with maximum speed setting, by an external circuit to after the setting of motor rotary speed, makes motor may operate in maximum speed; Therefore, when motor drive can provide the setting of a maximum speed, under identical motor load, the highest rotating speed application can be reached, to reach the demand of heat radiation.
A main purpose more of the present invention is to provide a kind of motor drive with minimum speed and maximum speed setting, by an external circuit to after the setting of motor rotary speed, makes motor may operate in minimum speed or maximum speed; Motor operated in minimum speed time, for avoiding when the pulse period of PWM drive singal is less than motor minimum work moment (torque), cause motor to stop operating, control mode keeps the requirement of minimum heat radiation and takes into account energy-conservation effectiveness whereby; Motor operated in maximum speed time, can under identical motor load, reach the highest rotating speed application, to reach the demand of heat radiation.
Of the present invention also have a main purpose to be to provide a kind of motor drive with minimum speed and maximum speed setting, by at least one external circuit to after the setting of motor rotary speed, make motor operated when minimum speed or maximum speed, be not subject to the impact of the PWM drive singal that external system provides completely; Further increase the flexibility ratio of motor applications whereby.
According to above-mentioned projects, the invention provides a kind of motor rotary speed setting device, comprise: a pwm signal generation circuit, its input is connected with PWM drive singal, and exports a pulse signal (P_PWM) synchronous with the triggering signal of PWM drive singal by output; A speed and current initialization circuit, its input is connected with a circuit, controls speed and current initialization circuit export an electric current by Circuit tuning; A tach signal produces circuit, and the electric current that its input exports with speed and current initialization circuit is connected, and exports by output one is changed into electronegative potential pulse signal (P_MINR/P_MAXR) by high potential; A RS latch circuit, the pulse signal (P_PWM) that the triggering signal of the PWM drive singal that its first input end and pwm signal generation circuit export is synchronous connects, its second input and tach signal produce the pulse signal (P_MINR/P_MAXR) that circuit exports and are connected, and the pulse signal (VMINR/VMAXR) of first fixed cycle is exported by the first output, the pulse signal (V of second fixed cycle is exported by the second output
sET) produce the second input of circuit to tach signal; And a gate, its first input end is connected with PWM drive singal, the pulse signal (VMINR/VMAXR) of the first fixed cycle that its second input exports with the first output of RS latch circuit is connected, to export the control signal of a motor rotary speed.
The invention provides another kind of motor drive, formed by a motor rotary speed setting device and an output unit, and output unit is connected with the output of motor rotary speed setting device, wherein, motor rotary speed setting device comprises: a pwm signal generation circuit, its input is connected with PWM drive singal, and exports a pulse signal (P_PWM) synchronous with the triggering signal of PWM drive singal by output; A speed and current initialization circuit, its input is connected with a circuit, controls speed and current initialization circuit export an electric current by Circuit tuning; A tach signal produces circuit, and the electric current that its input exports with speed and current initialization circuit is connected, and exports a pulse signal (P_MINR/P_MAXR) by output; A RS latch circuit, the pulse signal (P_PWM) that the triggering signal of the PWM drive singal that its first input end and pwm signal generation circuit export is synchronous connects, its second input and tach signal produce the pulse signal (P_MINR/P_MAXR) that circuit exports and are connected, and the pulse signal (VMINR/VMAXR) of first fixed cycle is exported by the first output, the pulse signal (V of second fixed cycle is exported by the second output
sET) produce the second input of circuit to tach signal; And a gate, its first input end is connected with PWM drive singal, the pulse signal (VMINR/VMAXR) of the first fixed cycle that its second input exports with the first output of RS latch circuit is connected, to export the control signal of a motor rotary speed.
The present invention then reoffers a kind of motor drive, formed by a motor rotary speed setting device and an output unit, and output unit is connected with the output of motor rotary speed setting device, wherein, motor rotary speed setting device comprises: a pwm signal generation circuit, its input is connected with a PWM drive singal, and exports a pulse signal (P_PWM) synchronous with the triggering signal of PWM drive singal by output; One minimum speed setting device, the pulse signal (P_PWM) that the triggering signal of the PWM drive singal that its first input end and pwm signal generation circuit export is synchronous connects, its second input is connected with the first circuit, and exports the pulse signal (VMINR) of first fixed cycle; One maximum speed setting device, the pulse signal (P_PWM) that the triggering signal of this PWM drive singal that its first input end and pwm signal generation circuit export is synchronous connects, its second input is connected with second circuit, and exports the pulse signal (VMAXR) of second fixed cycle; One OR gate, the pulse signal (P_PWM) that the triggering signal of the PWM drive singal that its first input end and pwm signal generation circuit export is synchronous connects, its second input is connected with the pulse signal (VMINR) of the first fixed cycle, and exports first control signal (PWM_MIN) by output; One AND gate, its first input end is connected with the first control signal (PWM_MIN), its second input is connected with the pulse signal (VMAXR) of the second fixed cycle, and exports second control signal (PWM_MIN_MAX) to output unit by output.
Accompanying drawing explanation
Fig. 1 is that the PWM drive singal of prior art is to the schematic diagram of motor rotary speed;
Fig. 2 is the circuit box schematic diagram with the motor drive of minimum speed setting device of the present invention;
Fig. 3 is the waveform schematic diagram of each circuit of Fig. 2 of the present invention;
Fig. 4 is that the pwm pulse signal in the motor drive with minimum speed setting device of the present invention produces circuit diagram;
Fig. 5 is the minimum/maximum currents initialization circuit schematic diagram in the motor drive with minimum speed setting device of the present invention;
Fig. 6 be of the present invention have in the motor drive of minimum speed setting device minimum/maximum speed produce circuit diagram;
Fig. 7 is that PWM drive singal of the present invention is to the schematic diagram of motor rotary speed;
Fig. 8 is the circuit box schematic diagram with the motor drive of maximum speed setting device of the present invention;
Fig. 9 is the waveform schematic diagram of each circuit of Fig. 8 of the present invention;
Figure 10 is the circuit box schematic diagram with the motor drive of minimum-maximum speed setting device of the present invention; And
Figure 11 is the waveform schematic diagram of each circuit of Figure 10 of the present invention.
[main element symbol description]
10/11/12-motor drive;
20-Hall element;
21/22-resistance;
30-PWM drive singal;
40-motor;
110-Hall bias voltage;
130-control unit;
200-output unit;
300/620-minimum speed setting device;
310/510/610PWM-signal generating circuit;
3110/3120/3130/3140/3150-inverter;
3160-capacitor;
3170-NAND gate;
320/520-speed and current initialization circuit;
3210/3220/3330-transistor;
3230/3240-current mirroring circuit;
330/530-tach signal produces circuit;
3310-comparator;
3320-capacitor;
R4/R5/R6-resistance;
340/540RS-latch circuit;
350/360/560/640-OR gate;
550/650-AND gate;
400/410-external circuit;
500/630-maximum speed setting device;
600-is minimum-maximum speed setting device.
Embodiment
The present invention mainly discloses a kind of motor drive with minimum speed and maximum speed setting, by an external circuit to after the setting of motor rotary speed, makes motor may operate in minimum speed and maximum speed.Due to the present invention be increase in general motor drive a kind of minimum speed setting and (or) a maximum speed initialization circuit reach; Therefore for the motor control circuit (at least comprising: magnetic hysteresis device, anti-deadlock judgment means and counting device etc.) in motor drive and motor output unit circuit etc., be that the associated components that uses with prior art is identical, therefore the detailed circuit of motor control circuit and motor output unit be not shown in figure.In addition, the accompanying drawing in following literary composition, also not according to the actual complete drafting of relative dimensions, its effect is only expressing the schematic diagram relevant with feature of the present invention.
First, please refer to Fig. 2, is the schematic diagram with the motor drive embodiment of minimum speed initialization circuit of the present invention.As shown in Figure 2, motor drive 10 of the present invention comprises Hall bias voltage 110, output unit 200 and minimum speed setting device 300 etc.After motor drive 10 is started, the PWM drive singal (PWM_IN) 30 of a high potential can be provided by the system of motor drive 10 outside, the PWM drive singal (PWM_IN) 30 (as shown in the PWM_IN drive signal waveform of Fig. 3) of this high potential can after the process of minimum speed setting device 300, produce a PWM minimum speed signal (as shown in the PWM_MIN minimum speed control signal waveform of Fig. 3) and output to control unit 130, then controlling output unit 200 by control unit 130 and rotate with CD-ROM drive motor 40.After motor 40 starts rotation, the commutation signal during rotation of motor 40 can be delivered to the magnetic hysteresis device (not being shown in Fig. 2) of motor drive 10 by the Hall element 20 be arranged on motor 40, for judging whether lasting the rotating of motor 40.Then, the 1st terminal of Hall element 20 is connected with the power line being applied with Hall bias voltage 110 via resistance 21, and its 2nd terminal is via resistance 22 ground connection.Clearly, the voltage of hall signal that the 1st output of Hall element 20 and the 2nd output export changes along with the position of motor 40 rotor.
Please continue to please refer to Fig. 2 and Fig. 3, wherein Fig. 3 is the signal schematic representation in the minimum speed setting device of Fig. 2.Minimum speed setting device 300 of the present invention is by a pwm signal generation circuit (PWM signal pulse generator circuit) 310, a speed and current initialization circuit (rotationspeed current setting circuit) 320, in the present embodiment, this speed and current initialization circuit is called minimum speed current setting circuit (MINR current setting circuit), a tach signal produces circuit (rotation speed generator circuit) 330, in the present embodiment, this speed and current initialization circuit is called that minimum speed produces circuit (MINR rotation speed generator circuit), a RS latch circuit 340 and an OR gate (OR Gate) 350 formed.
As shown in Figure 2, after the PWM drive singal 30 (as shown in the PWM_IN drive signal waveform in Fig. 3) of the high potential provided when external system enters to minimum speed initialization circuit 300, it is entered by the input of pwm signal generation circuit 310, then exports a P_PWM signal (as shown in the P_PWM signal waveform in Fig. 3) by the output of pwm signal generation circuit 310; Then, the input of minimum speed current setting circuit 320 is connected with an external circuits 400 (such as: this external circuits 400 can be the resistance that can change according to system requirements), and via adjustment external circuits 400 with produce one setting electric current after, export this setting electric current to input that minimum speed produces circuit 330, then export a P_MINR signal (as shown in the P_MINR signal waveform in Fig. 3) by the output of minimum speed generation circuit 330; Afterwards, the P_MINR signal that the P_PWM signal produced by pwm signal generation circuit 310 and minimum speed generation circuit 330 produce is delivered in RS latch circuit 340 together, make RS latch circuit 340 produce the VMINR pulse signal (as shown in the VMINR pulse signal waveform in Fig. 3) of a fixed cycle, this VMINR pulse signal is minimum speed setting voltage; Finally, after VMINR pulse signal can carry out the computing of OR with PWM drive singal 30 (PWM_IN) again, producing a PWM_MIN signal (as shown in the PWM_MIN minimum speed control signal waveform in Fig. 3) and output to control unit 130, rotating so as to controlling motor 40; Wherein, when the pulse period of PWM drive singal 30 (PWM_IN) is less than the pulse period of VMINR signal, after carrying out the computing of OR by VMINR pulse signal and PWM drive singal 30 (PWM_IN), export a PWM_MIN signal by OR gate 350 to carry out CD-ROM drive motor 40 and rotate, PWM_MIN signal is now the control signal of minimum speed, namely carrys out CD-ROM drive motor 40 with VMINR pulse signal and rotates; When the pulse period of PWM drive singal 30 (PWM_IN) is greater than the pulse period of VMINR signal, after carrying out the computing of OR by VMINR pulse signal and PWM drive singal, a PWM_MIN signal is exported by OR gate 350, now, namely the rotation of motor 40 controls rotating speed by PWM drive singal 30 (PWM_IN).
Clearly, as the input of minimum speed current setting circuit 320 and the variable resistor (R of an external circuits 400
mSR) after connection, via suitably adjusting variable resistor R
mSRresistance value after, the leading portion rotating speed of PWM_MIN signal controlling motor rotary speed can be made (to be namely less than the interval of VMINR pulse period when the pulse period of PWM drive singal 30; About 10 ~ 30%) control (as shown in the PWM_MIN minimum speed control signal waveform of Fig. 3) of the PWM drive singal 30 do not provided by external system, but the rotating speed controlling motor according to VMINR pulse signal; After having crossed this interval, motor rotary speed then can accelerate to 100% with the control of PWM drive singal 30 (PWM_IN).If after external circuits 400 being formed open circuit (when being adjusted to infinity by variable resistor), then can make motor rotary speed completely by the control of PWM drive singal 30 (PWM_IN).
Then, the operating process describing the minimum speed setting device 300 of the present embodiment in detail is as follows.
First, please refer to Fig. 4, is the pwm signal generation circuit schematic diagram in the present embodiment.As shown in Figure 4, after the PWM drive singal 30 (PWM_IN) of the high potential provided when external system enters to minimum speed setting device 300, PWM drive singal 30 (PWM_IN) first after the first inverter 3110 in pwm signal generation circuit 310 and the second inverter 3120, can be input to the first input end of NAND gate 3170; Then, PWM drive singal 30 (PWM_IN) is again after the 3rd inverter 3130, a delay can be produced after capacitor 3160 is charged, again after the 4th inverter 3140 and the 5th inverter 3150, the signal another processed is input to the second input of NAND gate 3170, produces P_PWM signal afterwards by NAND gate 3170; Wherein P_PWM signal be one and PWM drive singal 30 (PWM_IN) positive edge triggering signal or the marginal small-pulse effect triggering signal synchronous along triggering signal (as shown in the P_PWM signal waveform in Fig. 3).Afterwards, this P_PWM signal can be input to the first input end of RS latch unit 340.
Please refer to Fig. 5, is the minimum speed current setting circuit schematic diagram in the present embodiment.As shown in Figure 5, its input of minimum speed current setting circuit 320 is connected with an external circuits 400; In the present embodiment, this external circuits 400 is a resistance (R
mSR).Dividing point V can be learnt by the circuit of Fig. 5
aafter the electric potential shifting (level-shift) that the first transistor 3210 and transistor seconds 3220 produce, an I can be obtained
mSRelectric current, wherein I
mSRelectric current can by dividing point V
adivided by resistance (R
mSR) and obtain, i.e. I
mSR=V
a/ R
mSR.Then, the I produced
mSRelectric current through a current mirroring circuit (be made up of transistor 3230 and transistor 3240), finally can be sent to minimum speed and produces circuit 330.
Please refer to Fig. 6, is that the minimum speed in the present embodiment produces circuit diagram.As shown in Figure 6, as the I that minimum speed current setting circuit 320 produces
mSRafter electric current enters to minimum speed generation circuit 330, I
mSRthe action that electric current can charge to electric capacity C2.It can thus be appreciated that it is via resistance (R that minimum speed produces circuit 320
mSR) set the I produced
mSRelectric current decides, and determines the size of minimum speed setting according to this.
Minimum speed produces circuit 330, is connected to dividing potential drop that resistance R4, resistance R5 and resistance R6 produce to set capacitor 3320 (C by the first input end point of a comparator 3310
2) charging potential, then by I
mSRelectric current is to capacitor 3320 (C
2) charging voltage that obtains is connected to the second input of comparator 3310; Work as V
sETwhen being a high potential, transistor 3330 can be switched on (ON), so I
mSRelectric current can by transistor 3330 conducting to earth point, now I
mSRcan't to capacitor 3320 (C
2) charging; And work as V
sETwhen becoming electronegative potential by high potential, transistor 3330 can not be switched on (i.e. OFF), now I
mSRelectric current will start capacitor 3320 (C
2) doing the action of charging, the waveform of its charging is as the Cap schematic diagram of Fig. 3 figure; Until capacitor 3320 (C
2) charging voltage be greater than the branch pressure voltage that resistance R4, resistance R5 and resistance R6 produce after, now comparator 3310 can export the pulse signal of a P_MINR; In Fig. 3 of the present embodiment, this P_MINR pulse signal can produce one is changed into electronegative potential pulse signal by high potential; But this P_MINR pulse signal also can be one and change into the pulse signal (not being shown in Fig. 3) of high potential by electronegative potential, to this, can be suitable in the present embodiment.
Afterwards, P_MINR signal is input to the second input of RS latch circuit 340, and P_PWM signal NAND gate 3170 produced is input to the first input end of RS latch circuit 340, after making P_MINR signal and P_PWM signal carry out computing, produced the VMINR pulse signal of a fixed cycle by the first output of RS latch circuit 340.In addition, second output end signal of RS latch circuit 340 can by P_PWM signal after an inverter, anti-phase P_PWM signal is delivered to OR gate 360 and does an OR computing with the VMINR pulse signal of the 3rd defeated end of RS latch circuit 340, to export the pulse signal V of another fixed cycle
sET, wherein V
sETthe phase place of pulse signal be contrary with VMINR pulse signal; And V
sETpulse signal is used to determine transistor 3330 whether conducting; Such as, V is worked as
sETpulse signal when being a high potential, transistor 3330 conducting can be made, and instantaneously by capacitor 3320 (C
2) on tension discharge to the current potential of earth point (GND); Until when P_PWM signal next time changes to electronegative potential by high potential, just by transistor 3330 closedown again (i.e. OFF), capacitor 3320 (C can be made
2) start charging.Simultaneously, PWM drive singal 30 also can be input to the first input end of OR gate 350, and after the VMINR pulse signal exported by RS latch circuit 340 inputs to the second input point of OR gate 350, namely OR gate 350 can export the signal (as shown in the PWM_MIN signal waveform in Fig. 3) of PWM_MIN, this PWM_MIN signal is the minimum speed setting signal produced after the minimum current set by PWM drive singal 30 (PWM_IN) and adjustment external circuits 400, this output signal delivers to motor driving control circuit 200, just can control the rotating speed of motor 40, when the pulse period of PWM drive singal 30 (PWM_IN) is less than the VMINR pulse signal that RS latch circuit 340 exports, by VMINR pulse signal and PWM drive singal 30 (PWM_IN) by after the action computing of OR gate 350, namely can export a pulse signal identical with VMINR pulse signal and rotate with minimum speed to control motor 40, clearly, the pulse period of this PWM drive singal 30 (PWM_IN) is less than the interval of VMINR pulse signal, before PWM_MIN signal, the interval of 10 ~ 30% (can according to different system demand, do the minimum speed adjustment of 10% ~ 30%), as Fig. 7 do the adjustment of minimum speed between the minimum speed setting district that indicates.And when the pulse period of PWM drive singal 30 (PWM_IN) is greater than the VMINR pulse signal that RS latch circuit 340 exports, by VMINR pulse signal and PWM drive singal 30 (PWM_IN) by after the action computing of OR gate 350, a signal identical with PWM drive singal 30 (PWM_IN) namely can be exported to control the rotation of motor 40; Clearly, after the pulse period of PWM drive singal 30 (PWM_IN) is greater than the interval of the VMINR pulse signal that RS latch circuit 340 exports, motor rotary speed then can accelerate to 100% with the control of PWM drive singal 30 (PWM_IN).
According to above-mentioned explanation, have in the motor drive of minimum speed initialization circuit of the present invention, as the input of minimum speed current setting circuit 320 and the variable resistor (R of an external circuits 400
mSR) after connection, via suitably adjusting variable resistor R
mSRresistance value after, the leading portion rotating speed of PWM_MIN signal controlling motor rotary speed can be made (to be namely less than the interval of VMINR pulse signal when the pulse period of PWM drive singal 30; Interval about 10 ~ 30% of PWM_MIN signal leading portion) control of PWM drive singal 30 (PWM_IN) that do not provide by external system, but the rotating speed (leading portion about 10 ~ 30% as the PWM_MIN signal of Fig. 3 is interval shown) of motor is controlled according to VMINR pulse signal; After having crossed this interval, motor rotary speed then can accelerate to 100% with the control of PWM drive singal 30 (PWM_IN).If after external circuits 400 being formed open circuit (when being adjusted to infinity by variable resistor), minimum speed current setting circuit 320 is made to produce I
mSRthe output of electric current, therefore cannot produce the capacitor 3320 (C in circuit 330 to minimum speed
2) charge, therefore make motor rotary speed completely by the control of PWM drive singal 30.
According to the motor drive with minimum speed initialization circuit of the present invention, by at least one external circuit to after the setting of motor rotary speed, can avoid, when the pulse period of PWM drive singal 30 is less than motor minimum work moment (torque), causing motor to stop operating; Control mode keeps the requirement of minimum heat radiation whereby.In addition, when motor operated at minimum speed time, be not subject to the impact of the PWM drive singal that external system provides completely; Further increase the flexibility ratio of motor applications whereby.
Please continue to please refer to Fig. 8 and Fig. 9, wherein Fig. 8 is the schematic diagram with the motor drive embodiment of maximum speed setting device of the present invention, and Fig. 9 is the signal schematic representation in the maximum speed setting device of Fig. 8.Motor drive 11 of the present invention comprises Hall bias voltage 110, output unit 200 and maximum speed setting device 500 etc. and formed; Clearly, difference between the embodiment of Fig. 8 and the embodiment of Fig. 2 is only: be configuration maximum speed setting device 500 in the motor drive 11 of Fig. 8 embodiment, and the output of maximum speed setting device 500 is the control signal PWM_MAX (and be configuration minimum speed setting device 300, and the most the output of slow-speed of revolution setting device 300 is the control signal PWM_MIN being exported a minimum speed by an OR gate 350) being exported a maximum speed by an AND gate 550 in the motor drive 10 of Fig. 2; In other words, the embodiment of Fig. 8 only uses different gates to produce control signal at the output of maximum speed setting device 500 and minimum speed setting device 300 from the embodiment of Fig. 2; Therefore the circuit structure of other parts of the embodiment of Fig. 8 and Fig. 2 and operating principle are identical, repeat no more.
Maximum speed setting device 500 in motor drive 11 of the present invention is by a pwm signal generation circuit (PWM signal pulse generator circuit) 510, a speed and current initialization circuit (rotation speed current setting circuit) 520, in the present embodiment, this speed and current initialization circuit is called maximum speed current setting circuit (MAXR current setting circuit), a rotating speed produces circuit (rotation speed generator circuit) 530, in the present embodiment, this rotating speed produces circuit and is called that maximum speed produces circuit (MAXR rotation speed generatorcircuit), a RS latch circuit 540 and an AND gate (AND Gate) 550 formed.
As shown in Figure 8, after the PWM drive singal 30 (as shown in the PWM_IN drive signal waveform in Fig. 9) of the high potential provided when external system enters to maximum speed setting device 500, it is entered by the input of pwm signal generation circuit 510, then exports a P_PWM signal (as shown in the P_PWM signal waveform in Fig. 9) by the output of pwm signal generation circuit 510; Then, the input of maximum speed current setting circuit 520 is connected with an external circuits 400 (such as: this external circuits 400 can be a resistance), and via adjustment external circuits 400 with produce one setting electric current after, export this setting electric current to input that maximum speed produces circuit 530, then export a P_MAXR signal (as shown in the P_MAXR signal waveform in Fig. 9) by the output of maximum speed generation circuit 530; Afterwards, the P_MAXR signal that the P_PWM signal produced by pwm signal generation circuit 510 and maximum speed generation circuit 530 produce is delivered in RS latch circuit 540 together, make RS latch circuit 540 produce the VMAXR pulse signal (as shown in the VMAXR pulse signal waveform in Fig. 9) of a fixed cycle, this VMAXR pulse signal is maximum speed setting voltage; Finally, after VMAXR pulse signal can carry out the computing of AND with PWM drive singal 30 again, producing a PWM_MAX signal (as shown in the PWM_MAX maximum speed control signal waveform in Fig. 9) and output to control unit 130, rotating so as to controlling motor 40; Wherein, when the pulse period of PWM drive singal 30 (PWM_IN) is less than VMAXR pulse signal, after carrying out the computing of AND by VMAXR pulse signal and PWM drive singal 30, export a PWM_MAX signal by AND gate 550 to carry out CD-ROM drive motor 40 and rotate, and PWM_MAX signal is now namely identical with PWM drive singal 30 (PWM_IN), and output to control unit 130, then control output unit 200 by control unit 130 and carry out CD-ROM drive motor 40 and rotate; Clearly, when the pulse period of PWM drive singal 30 (PWM_IN) is less than VMAXR pulse signal, motor rotary speed is the control by PWM drive singal 30 (PWM_IN); When the pulse period of PWM drive singal 30 (PWM_IN) is greater than VMAXR pulse signal, after carrying out the computing of AND by VMAXR pulse signal and PWM drive singal 30 (PWM_IN), export a PWM_MAX signal by AND gate 550, and this PWM_MAX signal is identical with V-MAXR pulse signal; That is, when the pulse period of PWM drive singal 30 (PWM_IN) is greater than the V-MAXR pulse signal that RS latch circuit 540 exports, motor rotary speed is the control by V-MAXR pulse signal.
Clearly, as the input of maximum speed current setting circuit 520 and the variable resistor (R of an external circuits 400
mSR) after connection, can according to the demand of system application, via suitably adjusting variable resistor R
mSRresistance value after, the back segment rotating speed of PWM_MAX signal controlling motor rotary speed can be made (to be namely greater than VMAXR pulse signal when the pulse period of PWM drive singal 30; Back segment 70% ~ 100% about PWM_MAX signal) control (as shown in the PWM_MAX maximum speed control signal waveform of Fig. 9) of PWM drive singal 30 that do not provide by external system, but the rotating speed of motor is controlled according to VMAXR pulse signal; Before this interval, motor rotary speed is the control by PWM drive singal 30 (PWM_IN).If after external circuits 400 being formed open circuit (when being adjusted to infinity by variable resistor), then can make motor rotary speed completely by the control of PWM drive singal 30.
Then, the operating process describing the maximum speed setting device 500 of the present embodiment in detail is as follows; Wherein, it is emphasized that in the embodiment of this maximum speed setting device 500, the circuit diagram of its pwm signal generation circuit 510 is identical with Fig. 4, therefore when the circuit diagram of pwm signal generation circuit 510 is described, is illustrate with the component symbol of Fig. 4; The circuit diagram of maximum speed current setting circuit 520 is identical with Fig. 5, therefore when the circuit diagram of maximum speed current setting circuit 520 is described, is illustrate with the component symbol of Fig. 5; The circuit diagram that maximum speed produces circuit 530 is identical with Fig. 6, therefore when illustrating that maximum speed produces the circuit diagram of circuit 530, is illustrate with the component symbol of Fig. 6; RS latch circuit 540 is identical with the RS latch circuit 340 in Fig. 2, therefore when the circuit diagram of RS latch circuit 540 is described, be illustrate with the component symbol of RS latch circuit 340, and OR gate 560 is identical with the OR gate 360 in Fig. 2.
First, please refer to Fig. 4, is the pwm signal generation circuit schematic diagram in the present embodiment.As shown in Figure 4, after the PWM drive singal 30 (PWM_IN) of the high potential provided when external system enters to maximum speed setting device 500, PWM drive singal 30 first after the first inverter 3110 in pwm signal generation circuit 510 and the second inverter 3120, can be input to the first input end of NAND gate 3170; Then, PWM drive singal 30 is again after the 3rd inverter 3130, a delay can be produced after capacitor 3160 is charged, again after the 4th inverter 3140 and the 5th inverter 3150, the signal another processed is input to the second input of NAND gate 3170, produces P_PWM signal afterwards by NAND gate 3170; Wherein P_PWM signal is one and PWM positive edge triggering signal or the marginal small-pulse effect signal synchronous along triggering signal (as shown in the P_PWM signal waveform in Fig. 9).Afterwards, this P_PWM signal can be input to the first input end of RS latch unit 540.
Please refer to Fig. 5, is the maximum speed current setting circuit schematic diagram in the present embodiment.As shown in Figure 5, its input of maximum speed current setting circuit 520 is connected with an external circuits 400; In the present embodiment, this external circuits 400 is a resistance (R
mSR).Dividing point V can be learnt by the circuit of Fig. 5
aafter the electric potential shifting (level-shift) that the first transistor 3210 and transistor seconds 3220 produce, an I can be obtained
mSRelectric current, wherein I
mSRelectric current can by dividing point V
adivided by resistance (R
mSR) and obtain, i.e. I
mSR=V
a/ R
mSR.Then, the I produced
mSRelectric current through a current mirroring circuit (be made up of transistor 3230 and transistor 3240), finally can be sent to maximum speed and produces circuit 530.
Please refer to Fig. 6, is that the maximum speed in the present embodiment produces circuit diagram.As shown in Figure 6, as the I that maximum speed current setting circuit 520 produces
mSRafter electric current enters to maximum speed generation circuit 530, I
mSRthe action that electric current can charge to electric capacity C2.It can thus be appreciated that it is via resistance (R that maximum speed produces circuit 520
mSR) set the I produced
mSRelectric current decides, and determines the size of maximum speed setting according to this.
Maximum speed produces circuit 530, is connected to dividing potential drop that resistance R4, resistance R5 and resistance R6 produce to set capacitor 3320 (C by the first input end point of a comparator 3310
2) charging potential, then by I
mSRelectric current is to capacitor 3320 (C
2) charging voltage that obtains is connected to the second input of comparator 3310; Work as V
sETwhen being a high potential, transistor 3330 can be switched on (ON), so I
mSRelectric current can be directed at earth point by transistor 3330, now I
mSRcan't to capacitor 3320 (C
2) charging; And work as V
sETwhen becoming electronegative potential by high potential, transistor 3330 can not be switched on (i.e. OFF), now I
mSRelectric current will start capacitor 3320 (C
2) doing the action of charging, the waveform of its charging is as the Cap schematic diagram of Fig. 9; Until capacitor 3320 (C
2) charging voltage be greater than the branch pressure voltage that resistance R4, resistance R5 and resistance R6 produce after, now comparator 3310 can export a P_MAXR signal, and this P_MAXR signal can produce one is changed into electronegative potential pulse (as shown in the P_MAXR signal waveform in Fig. 9) by high potential; But this P_MAXR signal also can be one and change into the pulse signal (not being shown in Fig. 9) of high potential by electronegative potential, to this, can be suitable in the present embodiment.Clearly, due to outer meeting resistance (R
mSR) 400 set point and Fig. 2 in outer meeting resistance (R
mSR) 400 set points are not identical, therefore make I
mSRsize of current is not identical yet, therefore the capacitor 3320 (C of Fig. 9
2) charge waveforms Cap schematic diagram and Fig. 3 in capacitor 3320 (C
2) charge waveforms Cap schematic diagram not identical.
Afterwards, P_MINR signal is input to the second input of RS latch circuit 540, and P_PWM signal NAND gate 3170 produced is input to the first input end of RS latch circuit 540, after making P_MINR signal and P_PWM signal carry out computing, produced the VMINR pulse signal of a fixed cycle by the first output of RS latch circuit 540.In addition, second output end signal of RS latch circuit 540 can by P_PWM signal after an inverter, anti-phase P_PWM signal is delivered to OR gate 560 and does an OR computing with the VMAXR signal of the 3rd defeated end of RS latch circuit 540, to export the pulse signal V of another fixed cycle
sET, wherein V
sETthe phase place of pulse signal be contrary with VMINR pulse signal; And V
sETsignal is used to determine transistor 3330 whether conducting; Such as, V is worked as
sETsignal when being a high potential, transistor 3330 conducting can be made, and instantaneously by capacitor 3320 (C
2) on tension discharge to the current potential of earth point (GND); Until when P_PWM signal next time changes to electronegative potential by high potential, just by transistor 3330 closedown again (i.e. OFF), capacitor 3320 (C can be made
2) start charging.Clearly, due to the capacitor 3320 (C of Fig. 9
2) charge waveforms Cap schematic diagram and Fig. 3 in capacitor 3320 (C
2) charge waveforms Cap schematic diagram not identical, make the V of Fig. 9
sETsignal and the V of Fig. 3
sETsignal not identical yet.
Simultaneously, PWM drive singal 30 (PWM_IN) also can be input to the first input end of AND gate 550, and after the VMAXR pulse signal exported by RS latch circuit 540 inputs to the second input point of AND gate 550, namely AND gate 550 can export the signal (as shown in the PWM_MAX maximum speed control signal waveform in Fig. 9) of PWM_MAX, this PWM_MAX signal is the maximum speed setting signal produced after the maximum current set by PWM drive singal 30 (PWM_IN) and adjustment external circuits 400, this output signal delivers to motor driving control circuit 200, just can control the rotating speed of motor 40, clearly, because the pulse signal waveform figure of the VMINR in pulse signal waveform figure and Fig. 3 of the VMAXR of Fig. 9 is not identical, make the maximum speed control signal of the PWM_MAX of Fig. 9 also not identical with the minimum speed control signal of the PWM_MIN of Fig. 3.Such as, when the pulse period of PWM drive singal 30 (PWM_IN) is less than the VMAXR pulse signal that RS latch circuit 540 exports, after passing through the action computing of AND gate 550 by VMAXR pulse signal and PWM drive singal 30, the PWM_MAX signal that it exports is identical with PWM drive singal 30 (PWM_IN), that is, when the pulse period of PWM drive singal 30 (PWM_IN) is less than the VMAXR pulse signal that RS latch circuit 540 exports, motor rotary speed is the control by PWM drive singal 30 (PWM_IN).And when the pulse period of PWM drive singal 30 (PWM_IN) is greater than the VMAXR pulse signal that RS latch circuit 540 exports, by VMAXR pulse signal and PWM drive singal 30 (PWM_IN) by after the action computing of AND gate 550, the PWM_MAX signal that it exports is identical with VMAXR pulse signal, that is, when the pulse period of PWM drive singal 30 (PWM_IN) is greater than the VMAXR pulse signal that RS latch circuit 540 exports, motor rotary speed is the control by VMAXR pulse signal; Clearly, the interval of the VMAXR pulse signal that RS latch circuit 540 exports is greater than in the pulse period of PWM drive singal 30 (PWM_IN), after PWM_MAX signal 70% ~ 100% interval, namely as Fig. 7 do the adjustment of maximum speed between the maximum speed setting district that indicates.
According to above-mentioned explanation, have in the motor drive of maximum speed initialization circuit of the present invention, as the input of maximum speed current setting circuit 520 and the variable resistor (R of an external circuits 400
mSR) after connection, via suitably adjusting variable resistor R
mSRresistance value after, the back segment rotating speed of PWM_MAX signal controlling motor rotary speed can be made (to be namely greater than the interval of VMAXR pulse signal when the pulse period of PWM drive singal 30; Interval about 70% ~ 100% of PWM_MAX signal back segment) control of PWM drive singal 30 that do not provide by external system, but the rotating speed (as shown in PWM_MAX maximum speed control signal back segment about 70% ~ 100% interval of Fig. 9, can adjust according to the no demand of system) of motor is controlled according to VMAXR pulse signal; Before this interval, motor rotary speed is the control by PWM drive singal 30.If after external circuits 400 being formed open circuit (when being adjusted to infinity by variable resistor), maximum speed current setting circuit 520 is made to produce I
mSRthe output of electric current, therefore cannot produce the capacitor 3320 (C in circuit 530 to maximum speed
2) charge, therefore make motor rotary speed completely by the control of PWM drive singal 30.
According to the motor drive with maximum speed initialization circuit of the present invention, by at least one external circuit to after the setting of motor rotary speed, therefore when motor drive can provide the setting of a maximum speed, can under identical motor load, reach the highest rotating speed application, to reach the demand of heat radiation.In addition, when motor operated at maximum speed time, be not subject to the impact of the PWM drive singal that external system provides completely; Further increase the flexibility ratio of motor applications whereby.
Then, please continue to please refer to Figure 10 and Figure 11, wherein Figure 10 is the schematic diagram with the motor drive embodiment of minimum-maximum speed setting device of the present invention, and Figure 11 be Figure 10 minimum-maximum speed setting device in signal schematic representation.The motor drive 12 with minimum-maximum speed setting device of the present invention comprises Hall bias voltage 110, output unit 200 and minimum-maximum speed setting device 600 etc. and formed; Clearly, simultaneously the embodiment of Figure 10 is configured in the motor drive 12 of the present embodiment by minimum speed setting device 300 embodiment of the maximum speed setting device 500 of Fig. 8 and Fig. 2, make in motor drive 12 formed one minimum-(therefore in follow-up explanation, the symbol that each built-up circuit in maximum speed setting device uses is identical with Fig. 8 for maximum speed setting device 600; And the symbol that each built-up circuit in minimum speed setting device uses is identical with Fig. 2); Therefore, the motor drive 12 of the present embodiment can provide a leading portion to be to control motor rotary speed according to VMINR pulse signal, and be to control the control signal (as shown in the PWM_MIN_MAX speed controling signal waveform of Figure 11) of motor rotary speed according to VMAXR pulse signal at back segment, and the interval between PWM_MIN_MAX speed controling signal leading portion and back segment, be then controlled by PWM drive singal 30 (PWM_IN).Certainly, by the circuit design of this motor drive 12, also can select to provide one according to VMINR pulse signal to control the rotating speed of motor, or provide one according to VMAXR pulse signal to control the rotating speed of motor.
According to above-mentioned, the minimum speed setting device 620 in motor drive 12 produces circuit (MINR rotation speed generator circuit) 330, RS latch circuit 340 by a pwm signal generation circuit (PWM signal pulse generator circuit) 310, minimum speed current setting circuit (MINR current setting circuit) 320, minimum speed and an OR gate (OR Gate) 640 formed; And the maximum speed setting device 630 in motor drive 12 produces circuit (MAXR rotation speed generator circuit) 530, RS latch circuit 540 by a pwm signal generation circuit (PWM signal pulsegenerator circuit) 510, maximum speed current setting circuit (MAXR current settingcircuit) 520, maximum speed and an AND gate (AND Gate) 650 formed.In addition, in a preferred embodiment, can select the common circuit in minimum speed setting device 620 and maximum speed setting device 630, namely pwm signal generation circuit shifts out from minimum speed setting device 620 and maximum speed setting device 630, and provide P_PWM signal required in minimum speed setting device 620 and maximum speed setting device 630 by a pwm signal generation circuit 610, as shown in Figure 10; So, circuit element can be saved further.Clearly, the embodiment of Figure 10 and its same circuits structure of embodiment of Fig. 8 and Fig. 2 and operating principle are repeated no more.
After the PWM drive singal 30 (as shown in the PWM_IN signal waveform in Figure 11) of the high potential provided when external system is entered by the input of pwm signal generation circuit 610, then export a P_PWM signal (as shown in the P_PWM signal waveform in Figure 11) by the output of pwm signal generation circuit 610; Then, the input of minimum speed setting device 620 is connected with an external circuits 400 (such as: this external circuits 400 can be a resistance), and via adjustment external circuits 400 with produce one setting electric current after, export a VMINR pulse signal (as shown in the VMINR signal waveform in Figure 11) by minimum speed setting device 620, this VMINR pulse signal is minimum speed setting voltage; Being noted that via adjusting external circuits 400 with the process making minimum speed setting device 620 export a VMINR pulse signal at this, being identical with the minimum speed setting device 300 in the embodiment of Fig. 2, therefore repeating no more.
When the pulse period of PWM drive singal 30 (PWM_IN) is less than the V-MINR pulse signal that minimum speed setting device 620 exports, after VMINR pulse signal and PWM drive singal 30 (PWM_IN) computing by OR gate 640, namely can export a VMINR pulse signal to control rotating with minimum speed of motor 40; Clearly, the pulse period of this PWM drive singal 30 (PWM_IN) is less than the interval of VMINR pulse signal, is the interval (as shown in the PWM_MIN minimum speed control signal waveform of Figure 11) at PWM drive singal 30 (PWM_IN) front 10 ~ 30%; And after the pulse period of PWM drive singal 30 (PWM_IN) is greater than VMINR, this VMINR pulse signal and PWM drive singal 30 (PWM_IN), by after the action computing of OR gate 640, namely can export a pulse signal identical with PWM drive singal 30 (PWM_IN) to control motor 40; Clearly, after the pulse period of PWM drive singal 30 (PWM_IN) is greater than the interval of VMINR pulse signal, motor rotary speed then can be subject to the control of PWM drive singal 30 (PWM_IN).
After the PWM drive singal 30 (as shown in the PWM_IN signal waveform in Figure 11) of the high potential provided when external system is entered by the input of pwm signal generation circuit 610, then export a P_PWM signal (as shown in the P_PWM signal waveform in Figure 11) by the output of pwm signal generation circuit 610; Then, the input of maximum speed setting device 630 is connected with an external circuits 410 (such as: this external circuits 410 can be a resistance), and via adjustment external circuits 410 with produce one setting electric current after, export a VMAXR pulse signal (as shown in the VMAXR pulse signal waveform in Figure 11) by maximum speed setting device 630, this VMAXR pulse signal is maximum speed setting voltage; Being noted that via adjusting external circuits 410 with the process making maximum speed setting device 630 export a VMAXR pulse signal at this, being identical with the maximum speed setting device 500 in the embodiment of Fig. 8, therefore repeating no more.
Then, again as shown in Figure 10, maximum speed setting device 630 can by it export the input that a VMAXR pulse signal inputs to AND gate 650, another input of AND gate 650 is then that the PWM_MIN signal exported with OR gate 640 is connected.
When the pulse period of PWM drive singal 30 (PWM_IN) is less than VMINR pulse signal, front 10 ~ 30% intervals of the PWM_MIN signal that OR gate 640 exports are identical with VMINR pulse signal; In other words, the signal that now OR gate 640 exports is VMINR pulse signal.
The VMAXR pulse signal that it can export by the PWM_MIN pulse signal exported when OR gate 640 and maximum speed setting device 630 is after the computing of AND gate 650, a PWM_MIN_MAX signal can be exported, and front 10% ~ 30% of this PWM_MIN_MAX signal (can according to system requirements, adjustment external circuit 400) be identical with VMINR pulse signal, namely this PWM_MIN_MAX signal can output to control unit 130, then controls output unit 200 by control unit 130 and carry out CD-ROM drive motor 40 and rotate; In other words, when the pulse period of PWM drive singal 30 (PWM_IN) is less than VMINR signal, the motor 40 in motor drive 12 of the present invention is controlled by VMINR pulse signal; Same, the interval being controlled motor 40 by VMINR pulse signal before PWM_MIN_MAX signal 10 ~ 30% interval (as shown in the PWM_MIN_MAX speed controling signal of Figure 11).
When the pulse period of PWM drive singal 30 (PWM_IN) is greater than VMINR pulse signal, the PWM_MIN signal that OR gate 640 exports can be identical with PWM drive singal 30 (PWM_IN); In other words, the signal that now OR gate 640 exports is PWM drive singal 30 (PWM_IN).The VMAXR pulse signal that it can export by the PWM drive singal 30 (PWM_IN) exported when OR gate 640 and maximum speed setting device 630, after the computing of AND gate 650, can export a PWM_MIN_MAX signal.When the pulse period of PWM_MIN is less than VMAXR signal, the PWM_MIN_MAX signal that AND gate 650 exports is identical with the pulse signal of PWM_MIN, when the pulse period of PWM_MIN is greater than VMAXR signal, the PWM_MIN_MAX signal that AND gate 650 exports is identical with VMAXR pulse signal, namely this PWM_MIN_MAX signal can output to control unit 130, then controls output unit 200 by control unit 130 and carry out CD-ROM drive motor 40 and rotate, in other words, when the pulse period of PWM drive singal 30 (PWM_IN) is less than VMINR pulse signal, front 10% ~ 30% of PWM_MIN_MAX signal (can according to system requirements, adjustment external circuit 400) be identical with VMINR pulse signal, when the pulse period of PWM drive singal 30 (PWM_IN) is greater than VMINR and is less than VMAXR, the output of PWM_MIN_MAX signal is identical with the signal of PWM_IN, when the pulse period of PWM drive singal 30 (PWM_IN) is greater than VMAXR pulse signal, 70% ~ 100% of PWM_MIN_MAX signal back segment (can according to system requirements, adjustment external circuit 410) be identical with VMAXR pulse signal, motor 40 in motor drive 12 of the present invention is controlled (as shown in the PWM_MIN_MAX speed controling signal waveform of Figure 11) by PWM_MIN_MAX pulse signal.And the curve exported can comprise minimum-maximum speed setting, as shown in the speed curves of Fig. 7.
Have in the motor drive of minimum-maximum speed setting device of the present invention, if after external circuits 400 being formed open circuit (when being adjusted to infinity by variable resistor), make minimum speed setting device 620 can not produce the output of setting electric current, therefore namely minimum speed setting device 620 can not produce VMINR pulse signal, makes motor rotary speed completely by the control of PWM drive singal 30 (PWM_IN); Until (be namely greater than the interval of VMAXR pulse signal when the pulse period of PWM drive singal 30 after the pulse period of PWM drive singal 30 (PWM_IN) is greater than VMAXR pulse signal; Interval about 70% ~ 100% of PWM_MIN_MAX signal back segment), now, the control of the PWM drive singal 30 that the motor drive with minimum-maximum speed setting device of the present invention does not provide by external system, but the rotating speed of motor is controlled according to VMAXR signal, therefore the controlling functions of its reality is identical with the motor drive of the maximum speed setting device of Fig. 8.
Have in the motor drive of minimum-maximum speed setting device of the present invention, if after external circuits 410 being formed open circuit (when being adjusted to infinity by variable resistor), make maximum speed setting device 630 can not produce the output of setting electric current, therefore namely maximum speed setting device 630 can not produce VMAXR pulse signal.(interval of VMAXR pulse signal is less than when the pulse period of PWM drive singal 30 when the pulse period of PWM drive singal 30 (PWM_IN) is less than VMINR pulse signal; Interval about 10 ~ 30% of PWM_MIN_MAX signal leading portion), now, the control of the PWM drive singal 30 (PWM_IN) that the motor drive with minimum-maximum speed setting device of the present invention does not provide by external system, but the rotating speed of motor is controlled according to VMINR pulse signal, therefore the controlling functions of its reality is identical with the motor drive of the minimum speed setting device of Fig. 2.
According to the motor drive with minimum-maximum speed setting provided by the present invention, by different external circuits to after the setting of motor rotary speed, motor is made to may operate in minimum speed or maximum speed; In motor operated at minimum speed time, for avoiding when the pulse period of PWM drive singal 30 (PWM_IN) is less than motor minimum work moment (torque), cause motor to stop operating, control mode keeps the requirement of minimum heat radiation and takes into account energy-conservation effectiveness whereby; Motor operated in maximum speed time, can under identical motor load, reach the highest rotating speed application, to reach the demand of heat radiation.In addition, when motor operated at minimum speed or maximum speed time, be not subject to the impact of the PWM drive singal that external system provides completely; Further increase the flexibility ratio of motor applications whereby.
Finally, motor rotary speed setting device disclosed in this invention or motor drive, semiconductor process techniques all can be used to form a chip, therefore after motor rotary speed setting device disclosed by the invention or motor drive manufacture chip, the PWM drive singal 30 that the external system disclosed in above-described embodiment can be provided and external circuit are connected to the connecting pin (pins) of chip, and can be connected with a motor via other connecting pins, to control the rotating speed of motor.In addition, output unit 200 in motor drive disclosed in this invention, it can be configured to a kind of single-phase motor or a kind of three-phase motor, and namely motor drive 10/11/12 of the present invention all can control the rotating speed of single-phase motor or three-phase motor; Because single-phase motor or the structure of three-phase motor have been prior art, therefore repeat no more the operation that it is detailed.
As previously mentioned, the present invention has described the preferred embodiment of motor drive in detail, and its main purpose is for illustrating embodiments of the invention, and to make one of ordinary skill in the art be implemented, it is not intended to limit accurate application form of the present invention.Therefore those skilled in the art are by above-mentioned instruction, suggestion or learnt and revise to a certain degree to be possible by embodiments of the invention.Therefore, technological thought of the present invention will be decided by claim and equivalents thereof.
Claims (13)
1. a motor rotary speed setting device, comprising:
One pwm signal generation circuit, its input is connected with a PWM drive singal, and exports a pulse signal synchronous with the triggering signal of this PWM drive singal by output;
One speed and current initialization circuit, its input is connected with a circuit, controls this speed and current initialization circuit export an electric current by adjusting this circuit;
One tach signal produces circuit, and this electric current that its input exports with this speed and current initialization circuit is connected, and exports a pulse signal by output;
One RS latch circuit, the pulse signal that the triggering signal of this PWM drive singal that one first input end and this pwm signal generation circuit export is synchronous connects, one second input and this tach signal produce the pulse signal that circuit exports and are connected, and the pulse signal of first fixed cycle is exported by one first output, the pulse signal being exported second fixed cycle by one second output produces the second input of circuit to this tach signal, wherein, the pulse signal of this second fixed cycle is contrary with the phase place of the pulse signal of this first fixed cycle; And
One gate, one first input end is connected with this PWM drive singal, and one second input is connected with the pulse signal of this first fixed cycle that the first output of this RS latch circuit exports, to export the control signal of a motor rotary speed.
2. motor rotary speed setting device according to claim 1, wherein this gate is an OR gate.
3. motor rotary speed setting device according to claim 1, wherein this gate is an AND gate.
4. motor rotary speed setting device according to claim 1, wherein this circuit is a variable resistor.
5. a motor drive, formed by a motor rotary speed setting device and an output unit, and this output unit is connected with the output of this motor rotary speed setting device, wherein, this motor rotary speed setting device comprises:
One pwm signal generation circuit, its input is connected with a PWM drive singal, and exports a pulse signal synchronous with the triggering signal of this PWM drive singal by output;
One speed and current initialization circuit, its input is connected with a circuit, controls this speed and current initialization circuit export an electric current by adjusting this circuit;
One tach signal produces circuit, and this electric current that its input exports with this speed and current initialization circuit is connected, and exports a pulse signal by output;
One RS latch circuit, the pulse signal that the triggering signal of this PWM drive singal that one first input end and this pwm signal generation circuit export is synchronous connects, one second input and this tach signal produce the pulse signal that circuit exports and are connected, and the pulse signal of first fixed cycle is exported by one first output, the pulse signal being exported second fixed cycle by one second output produces the second input of circuit to this tach signal, wherein, the pulse signal of this second fixed cycle is contrary with the phase place of the pulse signal of this first fixed cycle; And
One gate, one first input end is connected with this PWM drive singal, and one second input is connected with the pulse signal of this first fixed cycle that the first output of this RS latch circuit exports, to export the control signal of a motor rotary speed.
6. motor drive according to claim 5, wherein this gate is an OR gate.
7. motor drive according to claim 5, wherein this gate is an AND gate.
8. motor rotary speed setting device according to claim 5, wherein this circuit is a variable resistor.
9. a motor drive, formed by a motor rotary speed setting device and an output unit, and this output unit is connected with the output of this motor rotary speed setting device, wherein, this motor rotary speed setting device comprises:
One pwm signal generation circuit, its input is connected with a PWM drive singal, and exports a pulse signal synchronous with the triggering signal of this PWM drive singal by output;
One minimum speed setting device, the pulse signal that the triggering signal of this PWM drive singal that one first input end and this pwm signal generation circuit export is synchronous connects, one second input is connected with one first circuit, and exports the pulse signal of first fixed cycle;
One maximum speed setting device, the pulse signal that the triggering signal of this PWM drive singal that one first input end and this pwm signal generation circuit export is synchronous connects, one second input is connected with a second circuit, and exports the pulse signal of second fixed cycle;
One OR gate, the pulse signal that the triggering signal of this PWM drive singal that one first input end and this pwm signal generation circuit export is synchronous connects, one second input is connected with the pulse signal of this first fixed cycle, and exports first control signal by output;
One AND gate, one first input end is connected with this first control signal, and one second input is connected with the pulse signal of this second fixed cycle, and exports one second by output and control signal to this output unit.
10. motor drive according to claim 9, wherein this minimum speed setting device comprises:
One speed and current initialization circuit, its input is connected with this first circuit, controls this speed and current initialization circuit export an electric current by adjusting this first circuit;
One tach signal produces circuit, and this electric current that its input exports with this speed and current initialization circuit is connected, and exports a pulse signal by output;
One RS latch circuit, the pulse signal that the triggering signal of this PWM drive singal that one first input end and this pwm signal generation circuit export is synchronous connects, one second input and this tach signal produce the pulse signal that circuit exports and are connected, and the pulse signal of this first fixed cycle is exported by one first output, the pulse signal being exported the 3rd fixed cycle again by one second output produces the second input of circuit to this tach signal, wherein, the pulse signal of the 3rd fixed cycle is contrary with the phase place of the pulse signal of this first fixed cycle; And
An OR gate, one first input end is connected with this PWM drive singal, and one second input is connected with the pulse signal of this first fixed cycle that the first output of this RS latch circuit exports, to export this first control signal.
11. motor drives according to claim 9, wherein this maximum speed setting device comprises:
One speed and current initialization circuit, its input is connected with this second circuit, controls this speed and current initialization circuit export an electric current by adjusting this second circuit;
One tach signal produces circuit, and this electric current that its input exports with this speed and current initialization circuit is connected, and exports a pulse signal by output;
One RS latch circuit, the pulse signal that the triggering signal of this PWM drive singal that one first input end and this pwm signal generation circuit export is synchronous connects, one second input and this tach signal produce the pulse signal that circuit exports and are connected, and the pulse signal of this second fixed cycle is exported by one first output, the pulse signal being exported the 4th fixed cycle again by one second output produces the second input of circuit to this tach signal, wherein, the pulse signal of the 4th fixed cycle is contrary with the phase place of the pulse signal of this second fixed cycle.
12. motor drives according to claim 10, wherein this first circuit is a variable resistor.
13. motor drives according to claim 11, wherein this second circuit is a variable resistor.
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| JPS60109785A (en) * | 1983-11-18 | 1985-06-15 | Hitachi Ltd | Speed control circuit of ac motor |
| CN101189788A (en) * | 2005-07-12 | 2008-05-28 | 罗姆股份有限公司 | Motor driving apparatus and electric appliance using same |
| CN101997476A (en) * | 2009-08-24 | 2011-03-30 | 晶致半导体股份有限公司 | Motor driving device and method |
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