CN100495898C - A brushless motor controller having overload switching and adjusting function - Google Patents
A brushless motor controller having overload switching and adjusting function Download PDFInfo
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- CN100495898C CN100495898C CNB2003101220848A CN200310122084A CN100495898C CN 100495898 C CN100495898 C CN 100495898C CN B2003101220848 A CNB2003101220848 A CN B2003101220848A CN 200310122084 A CN200310122084 A CN 200310122084A CN 100495898 C CN100495898 C CN 100495898C
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Abstract
A brushless motor controller with overload switching and adjustable function contains overload judging circuit for comparing sampled signal with overload threshold value then output overload or normal load signal, torque instruction switch for strobe output normal torque or overload torque instruction, current limiting protective circuit for comparing sampled signal with current limiting threshold value and output current limiting signal when the sampled signal is greater than current limiting protective threshold value, pulse width modulation signal generating circuit connected with torque instruction switch and current limiting protective circuit for responding the strobe output torque instruction signal to output pulse width modulation signal and responding current limiting signal to reduce duty ratio of pulse width modulation signal.
Description
Technical field
The present invention relates to brushless motor control device, particularly a kind ofly drive the control device of dc brushless motor in pulse-width modulation (PWM) mode, it has overload and switches and regulatory function.
Background technology
Advantages such as dc brushless motor (being designated hereinafter simply as motor) is non-maintaining because of having, low noise, efficient height and good speed adjustment features are applied to fields such as Industry Control, computer peripheral equipment, household electrical appliance and electric motor car increasingly extensively.The overload of motor in running is general phenomenon comparatively; its reason mainly is to be caused by the phase shortage driving of the starting that powers on, power-supply fluctuation, various forms of overload operation and motor or the short circuit of its winding, all has pair motor to transship usually in the control system and differentiates and the circuit of protecting.
For the speed and the metastable system that loads, overload current can be handled as limiting value and can be obtained good effect.But for speed and load system's (for example Industry Control and motor vehicle etc.) of variation significantly will take place at any time, go through electric current from normal operation at motor and begin increase stage and entering at last the process of limiting condition, it is overload current that current of electric increases from normal operating current, until the electric current that reaches capacity, wherein, the frequency of the size of overload current, the length of holding time and generation is not quite similar because of the difference of system and occasion.
But the function of current limliting or overcurrent protection judging circuit is fairly simple at present; be difficult to distinguish these three kinds of different states of limiting current that normal current, short overload electric current and fault cause; and will can not offer pulse-width modulation circuit for the overload torque instruction of regulating continuously again in when overload, therefore can't be in the gratifying threshold value of selection between the safe operation of motor and the potentiality performance.
Summary of the invention
The purpose of this invention is to provide a kind of brushless motor control device with overload switching and regulatory function.
A kind of brushless motor control device with overload switching and regulatory function comprises:
The overload judging circuit, its sampled signal and the overload threshold value that will take from the load compares, if sampled signal greater than the overload threshold value, output motor overload signal then, otherwise export the normal load signal;
The torque instruction diverter switch that links to each other with the overload judging circuit if receive the motor overload signal, then makes the output of overload torque command signal gating, otherwise makes the output of normal torque command signal gating;
Current-limiting protection circuit, its sampled signal and the current limliting threshold value that will take from the load compares, and at sampled signal output current limiting signal during greater than the current-limiting protection threshold value; And
The pulse-width modulation signal generating circuit that links to each other with current-limiting protection circuit with the torque instruction diverter switch; with the output pulse width modulation signal, and response current limliting signal is to reduce the duty ratio of pulse-width signal through the torque instruction signal of torque instruction diverter switch gating output in its response.
Reasonablely be, in above-mentioned brushless motor control device, described overload judging circuit comprises current sampling resistor and voltage comparator, wherein, one of them input of voltage comparator is connected to load through current sampling resistor, another input input overload threshold voltage.
Reasonablely be; in above-mentioned brushless motor control device; described current-limiting protection circuit comprises variable resistor voltage divider and voltage comparator; one of them input one side of voltage comparator is through the variable resistor ground connection of variable resistor voltage divider; also be connected to load through sampling resistor on the other hand, another input links to each other with the current-limiting protection threshold voltage.
Reasonablely be, in above-mentioned brushless motor control device, described pulse-width modulation signal generating circuit comprises saw-toothed wave generator and pulse width modulator, and the pulse signal input terminal of pulse width modulator links to each other with saw-toothed wave generator, and the reference signal input links to each other with described matrix instruction diverter switch.
Reasonable is that in above-mentioned brushless motor control device, described torque instruction diverter switch comprises:
First electronic switch, its control end links to each other with the output of overload judging circuit, and input links to each other with normal torque command signal end, and output links to each other with the reference signal input;
Second electronic switch, its control end links to each other through the output of inverter with the overload judging circuit, and input links to each other with overload torque command signal end, and output links to each other with the reference signal input.
Perhaps, in above-mentioned brushless motor control device, described torque instruction diverter switch comprises:
First diode, its negative pole links to each other with normal torque command signal end, and positive pole links to each other with the reference signal input and is connected to DC power supply through resistance;
Second diode, its negative pole links to each other with the output of overload torque command signal end with the overload judging circuit, and positive pole links to each other with the reference signal input.
Reasonablely be; in above-mentioned brushless motor control device, the output of described current-limiting protection circuit links to each other with the reference signal input through the 3rd diode, wherein; the negative pole of the 3rd diode links to each other with the output of current-limiting protection circuit, and positive pole links to each other with the reference signal input.
Reasonablely be; in above-mentioned brushless electric machine control circuit; described pulse-width modulation signal generating circuit further comprises one two input NAND gate circuit; one of them input links to each other with the output of operational amplifier, and another input links to each other with the output of current-limiting protection circuit through the R-S trigger.
Brushless motor control device of the present invention is divided into place of safety, three zones of overload region and protection zone according to the output combination of motor overload signal and current-limiting protection signal with motor status; utilize the torque instruction diverter switch to change the reference voltage of pulse-width modulation circuit; and when motor enters the overload operating state, realize Electric Machine Control, therefore the means that the NOL normal overload below the protection zone is discerned, switched and regulates to motor are provided by the mode of regulating " overload torque " command voltage.
Description of drawings
By below in conjunction with the description of accompanying drawing to preferred embodiment of the present invention, can further understand purpose of the present invention, feature and advantage, wherein:
Fig. 1 is the schematic block circuit diagram of brushless motor control device of the present invention.
Fig. 2 is the circuit diagram according to first embodiment of the invention.
Fig. 3 is the circuit diagram according to second embodiment of the invention.
Fig. 4 is the circuit diagram according to third embodiment of the invention.
Embodiment
Fig. 1 is the schematic block circuit diagram of brushless motor control device of the present invention.As shown in Figure 1, brushless motor control device of the present invention comprises overload judging circuit 1, torque instruction diverter switch 2, current-limiting protection circuit 3 and pulse-width modulation signal generating circuit 4, wherein, overload judging circuit 1 compares and judges whether motor is in overload by taking from sampled signal in the load and overload threshold value, if sampled signal is greater than the overload threshold value, output motor overload signal then, otherwise output normal load signal; Torque instruction diverter switch 2 links to each other with overload judging circuit 1, therefore can be under the control of the output signal of overload judging circuit 1, gating is exported corresponding torque instruction signal, particularly, if receive the motor overload signal, then the torque instruction diverter switch makes the output of overload torque command signal gating, otherwise makes the output of normal torque command signal gating; Current-limiting protection circuit 3 compares judging whether motor enters the current-limiting protection state by taking from sampled signal in the load and current-limiting protection threshold value, and at sampled signal values output current limiting signal during greater than the current limliting threshold value; Pulse-width modulation signal generating circuit 4 links to each other with torque instruction diverter switch 2; torque instruction signal according to the output of torque instruction diverter switch gating is exported the pulse-width signal with suitable duty ratio; in addition; pulse-width modulation signal generating circuit 4 also links to each other with current-limiting protection circuit 3, reduces the duty ratio of pulse-width signal when receiving the current limliting signal.
In brushless motor control device of the present invention, motor status is divided into following three zones:
The place of safety: in this zone, current of electric is simultaneously less than current-limiting protection thresholding and overload threshold.
Overload region: in this zone, current of electric is less than the current-limiting protection thresholding but greater than overload threshold.
The protection zone: in this zone, current of electric surmounts the current-limiting protection thresholding.
Corresponding therewith, control device takes different strategies that motor is controlled.In the place of safety, control device makes pulse-width modulation signal generating circuit 4 generate pulse-width signal according to the normal torque command signal; In overload region, need this moment to reduce the requirement that duty recently satisfies the load overload, so control device makes pulse-width modulation signal generating circuit 4 generate pulse-width signal according to the overload torque command signal; In the protection zone, if continue to improve this moment or the duty ratio of keeping pulse-width signal will cause electrical fault, so control device makes pulse-width modulation signal generating circuit 4 reduce the duty ratio of pulse-width signal according to the current-limiting protection signal.This shows that compare with two Region control modes of prior art, control mode of the present invention is more flexible and accurate, it can carry out suitable control to motor according to the factors such as the frequency of the size of overload current, the length of holding time and generation.
Below by accompanying drawing preferred embodiment of the present invention is described.
First embodiment
Fig. 2 is the circuit diagram according to first embodiment of the invention.In Fig. 2, overload judging circuit 1 comprises current sampling resistor Rs, voltage comparator U2, resistance R 1 and capacitor C 1, wherein, the inverting input of voltage comparator U2 is connected to current sampling resistor Rs and load through resistance R 1, and in-phase input end is connected to overload threshold voltage.
Pulse-width modulation signal generating circuit 4 comprises saw-toothed wave generator 41, pulse width modulator U1 and NAND gate circuit U6C, the inverting input of pulse width modulator U1 links to each other with saw-toothed wave generator 41, in-phase input end (being the reference signal input) links to each other with U3B with electronic switch U3A, variation along with the in-phase end input signal, the U1 output has output pulse-width modulation (PWM) signal of different duty, this signal exports two inputs of U6C simultaneously to, and exports on the output of U6C.
Torque instruction diverter switch 2 comprises the first electronic switch U3A, the second electronic switch U3B and inverter U5A, wherein, the control end of U3A links to each other with the output of U2, input links to each other with normal torque command signal end, and output links to each other with the reference signal input of U1, the control end of U3B links to each other with the output of U2 through inverter U5A, and input links to each other with overload torque command signal end, and output links to each other with the reference signal input of U1.
Current-limiting protection circuit 3 comprises variable resistor voltage divider, voltage comparator U4 and the diode D1 that is made up of resistance R 2 and variable resistor R3.The inverting input of voltage comparator U4 is connected to load through variable resistor R3 ground connection and through R1 and R2, and in-phase input end links to each other with the current-limiting protection threshold voltage.In the present embodiment; for the purpose of simplifying circuit; the in-phase input end of voltage comparator connects altogether in overload comparison circuit and the current-limiting protection circuit; therefore the benchmark comparative voltage is identical; but relation owing to resistance R 2 in the variable resistor voltage divider and R3; make the input voltage amplitude of voltage comparator U4 less than the input voltage amplitude of voltage comparator U2, thereby make the current-limiting protection threshold voltage be higher than overload threshold voltage.The output of voltage comparator U4 is connected to the in-phase input end of U1 through diode D1, the negative pole of diode D1 links to each other with the output of U4, positive pole links to each other with the in-phase input end of U1, therefore when voltage comparator U4 produces low level current limliting signal, the benchmark input voltage of U1 will be clamped to low level by diode in the pulse-width modulation signal generating circuit, thereby with the duty ratio restriction of pwm pulse or drop to safe zone.
When current of electric increases, the voltage at current sampling resistor Rs two ends raises and causes U2 inverting input voltage to raise, when it surpasses overload threshold voltage, voltage comparator U2 state output terminal reverses and produces low level overload signal, this moment, the first electronic switch U3A disconnected under the control of low level overload signal because of control end, and the second electronic switch U3B is closed under the control of high level signal because of control end, and the reference signal of input U1 promptly switches to the overload torque command signal by the normal torque command signal.Otherwise, when current of electric reduces, the voltage reduction at current sampling resistor Rs two ends causes U2 inverting input voltage to reduce, when it is lower than overload threshold voltage, voltage comparator U2 state output terminal reverses and produces high level signal, this moment, the first electronic switch U3A was closed under the control of high level overload signal because of control end, and the second electronic switch U3B disconnects under the control of low level signal because of control end, and the reference signal of input U1 promptly switches to the normal torque command signal by the overload torque command signal.
When current of electric further increases the voltage during greater than the current limliting threshold voltage that causes the U4 inverting input; voltage comparator U4 reverses and produces low level current-limiting protection signal; this moment U1 reference signal input signal by diode D1 clamp to low level; thereby force the pwm signal duty ratio to descend, avoid motor to break down.
In the present embodiment, the signal voltage on the sampling resistor Rs through the filtering of resistance R 1 and capacitor C 1 with interference in the filtered signal or burr.In the variable resistor voltage divider, can change the voltage of input U4 inverting input by the resistance of adjusting R3, thereby improve the adaptability of control device for different system.
Second embodiment
Fig. 3 is the circuit diagram according to second embodiment of the invention.Compare with first embodiment shown in Figure 2, its difference be pulse-width signal generative circuit 4 and with the connected mode of current-limiting protection circuit 3.
As shown in Figure 3; in pulse-width signal generative circuit 4; two inputs of NAND gate circuit U6C are connected to the output of pulse width modulator U1 no longer altogether; but only having an input to be attached thereto, another input then links to each other through the output of R-S trigger with current-limiting protection circuit 3 voltage comparator U4.
The R-S trigger is made of two NAND gate circuit U6A, U6B, resistance R 4, R5 and capacitor C 2, one of them input of U6A links to each other with the output of U4, another input links to each other with the output of U6B, one of them input of U6B links to each other with the output of U6A, resistance R 4 and capacitor C 2 ground connection of another input through being connected in parallel, the output of U6B also is connected to the input of U6C.Resistance R 4, R5 and capacitor C 2 constitute electrify restoration circuit, and wherein R4 and capacitor C 2 are connected in parallel between resistance R 5 and the ground connection, and the other end of resistance R 5 links to each other with power Vcc, therefore can provide reset level to U6B when powering on.
Because the structural difference of foregoing circuit, so the current-limiting protection working method of present embodiment and first embodiment are different.Particularly; when current of electric further increases the voltage during greater than the current limliting threshold voltage that causes the U4 inverting input; voltage comparator U4 counter-rotating also produces low level current-limiting protection signal; flip and flop generator will be triggered this moment; triggering signal is sent to one of them input of pulse-width signal generative circuit U6C; forbid the modulating pulse of gate output pulse width by NAND operation, be reduced to zero, make motor obtain effectively protection thereby reach the pwm signal duty ratio.
Except above-mentioned difference, present embodiment all is identical with first embodiment, therefore repeats no more.
The 3rd embodiment
Fig. 4 is the circuit diagram according to third embodiment of the invention.Compare with first embodiment shown in Figure 2, its difference is the structure difference of torque instruction diverter switch.
As shown in Figure 4, torque instruction diverter switch 2 comprises diode D1, D2 and resistance R 4, R5, the negative pole of diode D2 links to each other with normal torque command signal end, positive pole links to each other with the reference signal input of U1 and is connected to DC power supply Vcc through resistance R 4, the negative pole of diode D3 links to each other with overload torque command signal end and links to each other through the output of resistance R 5 with the voltage comparator U2 of overload judging circuit, and positive pole links to each other with the reference signal input of U1.Compare with first embodiment, present embodiment adopts diode D2 and D3 to replace electronic switch U3A and U3B.
Because the structural difference of foregoing circuit, so the torque instruction switching mode of present embodiment and first embodiment are different.Particularly, when current of electric increases, the voltage at current sampling resistor Rs two ends raises and causes U2 inverting input voltage to raise, when it surpasses overload threshold voltage, voltage comparator U2 counter-rotating also produces low level overload signal, this moment, diode D3 was with conducting, as this moment the overload torque command voltage less than the normal torque command voltage, then pulse-width modulation signal generating circuit 4 just is considered as it effectively, that is, the reference signal of input U1 promptly switches to the overload torque command signal by the normal torque command signal.Otherwise, when current of electric reduces, the voltage reduction at current sampling resistor Rs two ends causes U2 inverting input voltage to reduce, when it is lower than overload threshold voltage, voltage comparator U2 counter-rotating also produces high level signal, this moment, diode D3 was in anti-cut-off state partially, and the reference signal of input U1 promptly switches to the normal torque command signal by the overload torque command signal.
Except above-mentioned difference, present embodiment all is identical with first embodiment, therefore repeats no more.
Claims (8)
1, a kind of brushless motor control device with overload switching and regulatory function is characterized in that, comprising:
The overload judging circuit, its sampled signal and the overload threshold value that will take from the load compares, if sampled signal greater than the overload threshold value, output motor overload signal then, otherwise export the normal load signal;
The torque instruction diverter switch that links to each other with the overload judging circuit if receive the motor overload signal, then makes the output of overload torque command signal gating, otherwise makes the output of normal torque command signal gating;
Current-limiting protection circuit, its sampled signal and the current-limiting protection threshold value that will take from the load compares, and at sampled signal output current limiting signal during greater than the current-limiting protection threshold value; And
The pulse-width modulation signal generating circuit that links to each other with current-limiting protection circuit with the torque instruction diverter switch; with the output pulse width modulation signal, and response current limliting signal is to reduce the duty ratio of pulse-width signal through the torque instruction signal of torque instruction diverter switch gating output in its response.
2, brushless motor control device as claimed in claim 1, it is characterized in that described overload judging circuit comprises current sampling resistor and voltage comparator, wherein, one of them input of voltage comparator is connected to load through current sampling resistor, another input input overload threshold voltage.
3, brushless motor control device as claimed in claim 2; it is characterized in that; described current-limiting protection circuit comprises variable resistor voltage divider and voltage comparator; one of them input of voltage comparator is on the one hand through variable resistor voltage divider ground connection; also be connected to load through sampling resistor on the other hand, another input links to each other with the current-limiting protection threshold voltage.
4, brushless motor control device as claimed in claim 3, it is characterized in that, described pulse-width modulation signal generating circuit comprises saw-toothed wave generator and pulse width modulator, the pulse signal input terminal of pulse width modulator links to each other with saw-toothed wave generator, and the reference signal input is connected with described torque instruction diverter switch.
5, brushless motor control device as claimed in claim 4 is characterized in that, described torque instruction diverter switch comprises:
First electronic switch, its control end links to each other with the output of overload judging circuit, and input links to each other with normal torque command signal end, and output links to each other with the reference signal input;
Second electronic switch, its control end links to each other through the output of inverter with the overload judging circuit, and input links to each other with overload torque command signal end, and output links to each other with the reference signal input.
6, brushless motor control device as claimed in claim 4 is characterized in that, described torque instruction diverter switch comprises:
First diode, its negative pole links to each other with normal torque command signal end, and positive pole links to each other with the reference signal input and is connected to DC power supply through resistance;
Second diode, its negative pole links to each other with the output of overload torque command signal end with the overload judging circuit, and positive pole links to each other with the reference signal input.
7, as claim 5 or 6 described brushless motor control devices; it is characterized in that; the output of described current-limiting protection circuit links to each other with the reference signal input through the 3rd diode; wherein; the negative pole of the 3rd diode links to each other with the output of current-limiting protection circuit, and positive pole links to each other with the reference signal input.
8, brushless electric machine control circuit as claimed in claim 4; it is characterized in that; described pulse-width modulation signal generating circuit further comprises one two input NAND gate circuit; one of them input links to each other with the output of pulse width modulator, and another input links to each other with the output of current-limiting protection circuit through the R-S trigger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101220848A CN100495898C (en) | 2003-12-30 | 2003-12-30 | A brushless motor controller having overload switching and adjusting function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101220848A CN100495898C (en) | 2003-12-30 | 2003-12-30 | A brushless motor controller having overload switching and adjusting function |
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| CN1635702A CN1635702A (en) | 2005-07-06 |
| CN100495898C true CN100495898C (en) | 2009-06-03 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407781A (en) * | 2010-09-20 | 2012-04-11 | 大嘉科技股份有限公司 | Power supply method and device for electric vehicle with energy-saving function |
| GB201021458D0 (en) | 2010-12-17 | 2011-02-02 | Tf3 Ltd | Hair styling device |
| CN105262061B (en) * | 2015-11-24 | 2018-09-07 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of the protection circuit and control device of brshless DC motor |
| CN105553355B (en) * | 2016-02-18 | 2018-06-19 | 无锡利尔欣电子有限公司 | A kind of electric vehicle driving brshless DC motor current limliting value adjusting device and method |
| CN106300267A (en) * | 2016-08-29 | 2017-01-04 | 珠海格力电器股份有限公司 | Motor overload protection device and method and motor system |
| DE102016121747B4 (en) * | 2016-11-14 | 2021-09-16 | Torqeedo Gmbh | Device for specifying the speed level of an electric drive in a boat |
| CN106878585B (en) * | 2017-01-19 | 2024-02-06 | 杭州瑞盟科技股份有限公司 | High-definition HD/full-definition FHD selectable video filter driver |
| CN107962297B (en) * | 2017-11-01 | 2019-12-03 | 厦门盈趣科技股份有限公司 | The more motor load equilibrium assignment system and methods of laser engraving machine |
| CN110247615B (en) * | 2018-03-09 | 2024-04-12 | 深圳市蓝海华腾技术股份有限公司 | Wave-by-wave current limiting control system and method based on DSP chip and motor controller |
| CN113141144B (en) * | 2021-03-25 | 2023-03-28 | 联合汽车电子有限公司 | Motor drive circuit |
| CN116279772B (en) * | 2023-05-22 | 2023-07-25 | 常州通宝光电股份有限公司 | Automobile EPS torque overload protection circuit and protection method |
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