CN109687778A - Low-voltage, high-current BLDC winding back emf zero passage detection method - Google Patents
Low-voltage, high-current BLDC winding back emf zero passage detection method Download PDFInfo
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- CN109687778A CN109687778A CN201811617023.1A CN201811617023A CN109687778A CN 109687778 A CN109687778 A CN 109687778A CN 201811617023 A CN201811617023 A CN 201811617023A CN 109687778 A CN109687778 A CN 109687778A
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- voltage
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- crossing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
Abstract
The invention discloses a kind of low-voltage, high-current BLDC winding back emf zero passage detection methods.The present invention designs sample circuit first: the sample mode of traditional electric resistance partial pressure power-up capacitor filter is changed to directly sample using electric resistance partial pressure, and without the mode of capacitor filtering.Then design sample mode: modification PWM multi-carrier modulation scheme realizes the intermediate point sampling back-emf voltage be connected in PWM using triangular wave carrier, realizes accurate sampling.It finally carries out back-emf zero passage detection: being to be compared by comparing the back-emf voltage of detection phase with the virtual center point voltage of calculating, therefore, it is determined that the generation of zero crossing；When wherein every phase enters the opposite potential zero-crossing examination, increases a time delay process, execute zero-crossing examination again after the completion of time delay process.The present invention, in back-emf zero-crossing examination, can improve sampling accuracy rate, reduce the erroneous judgement of zero crossing in low-voltage, high-current BLDC motor, to more adapt to the characteristic of low-voltage, high-current.
Description
Technical field
The present invention relates to BLDC motor sensorless strategy fields, and in particular to a kind of low-voltage, high-current BLDC motor is without biography
Sensor controls back-emf zero passage detection method.
Background technique
Existing BLDC motor sensorless strategy is all by detecting back-emf zero crossing, and be then delayed 30 ° of electrical angles
Carry out commutation control.Used zero-crossing examination method be by detect three-phase output voltage signal, after capacitor filtering,
It is sampled by the channel AD of single-chip microcontroller, and calculates virtual center point voltage, carried out with the voltage of back-emf zero passage detection phase
Compare, to judge zero passage point moment.This method is higher in traditional voltage, and the little application of electric current has stronger
Versatility；But certain limitation has been embodied for the application of low-voltage and high-current.
Low-voltage, high-current BLDC electric motor resistance, inductance value are comparatively small；The control of PWM chopper control is carried out in the two-phase of conducting
When, it is zero that switching tube, which turns off line voltage, and line current reduces, and since inductance value is smaller, current changing rate di/dt is larger and is negative
Value, the backward voltage generated by curent change is larger, which causes the back-emf voltage for detecting phase to fall in detection phase
It falls.It is busbar voltage that line voltage, which is connected, in switching tube, and electric current in phase is connected and increases, and current changing rate di/dt is positive, generation it is reversed
The main resistance value electric current of voltage rises, and detects back-emf voltage of the voltage in phase containing only the phase magnetic linkage.It is open-minded due to PWM copped wave
Shutdown causes the period for detecting opposite potential voltage to fall recovery, and common BLDC motor can be straight by lesser capacitor filtering
Connect sampling；And low-voltage, high-current BLDC, since inductance value is lower, Voltage Drop speed is quickly and amplitude is larger, can not be by smaller
Capacitor filters out.Filter capacitor capacitance is larger and to will lead to detection voltage magnitude inaccurate, and causes biggish phase delay, this will lead
The back-emf zero passage detection time is caused to be not allowed, commutation failure.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of low-voltage, high-current BLDC winding back emf zero passage detection sides
Method.
The technical solution adopted for solving the technical problem of the present invention are as follows:
It designs sample circuit: the sample mode of traditional electric resistance partial pressure power-up capacitor filter is changed to directly adopt using electric resistance partial pressure
Sample, and without the mode of capacitor filtering.
Design sample mode: modification PWM multi-carrier modulation scheme realizes the intermediate point be connected in PWM using triangular wave carrier
Back-emf voltage is sampled, realizes accurate sampling.
Back-emf zero passage detection: is carried out by comparing the back-emf voltage of detection phase and the virtual center point voltage of calculating
Compare, therefore, it is determined that the generation of zero crossing；When wherein every phase enters the opposite potential zero-crossing examination, increase a time delay ring
Section, executes zero-crossing examination after the completion of time delay process again.
Beneficial effects of the present invention: the present invention, in back-emf zero-crossing examination, can be mentioned in low-voltage, high-current BLDC motor
Height sampling accuracy rate, reduces the erroneous judgement of zero crossing, to more adapt to the characteristic of low-voltage, high-current.
Specific embodiment
The present invention is being applied to low-voltage, high-current BLDC for currently back-emf zero-crossing examination is controlled without sensor BLDC
When on motor, there is a situation where zero-crossing examination difficulty, propose a kind of practical and effective back-emf zero-crossing examination method.
The invention mainly comprises sample circuit design, the method for sampling and back-emf zero-crossing examination algorithm.
Sample circuit design: the sample circuit that this method uses, compared to adopting for traditional electric resistance partial pressure power-up capacitor filter
Sample loading mode is changed to directly sample using electric resistance partial pressure, and without the mode of capacitor filtering.Low-voltage, high-current BLDC motor due to
The characteristic of itself causes the periodic voltage drop-out time in detection phase to account for relatively high, directly can not be led Voltage Drop with capacitor
The back-EMF determination of cause is interfered to filtering out.It, will be anti-using lesser filter capacitor also due to the periodic charge and discharge of capacitor
Potential voltage sampled point it is round and smooth fall, lead to sampling distortion, therefore this method uses direct resistance sampling.
The method of sampling: generally opening a little and turning off in PWM copped wave of traditional BLDC winding back emf voltage sample moment
Point, PWM open a little ringing noise due to switching tube, and voltage uses filter capacitor it is possible that larger fluctuation, in anti-electricity
When gesture voltage restores, capacitor charging needs the time, and sampling error is larger, general less use；Point sampling is turned off in PWM, commonly
BLDC motor di/dt it is smaller, therefore back-emf Voltage Drop speed is slow, and amplitude is small, keeps by the filtering of capacitor, can be calibrated
True sampling back-emf voltage.And low-voltage, high-current motor di/dt is big, back-emf voltage falls rapidly, turns off point sampling in PWM
Equally have large error.This method is led to realize in PWM using modification PWM multi-carrier modulation scheme, using triangular wave carrier
Logical intermediate point sampling back-emf voltage realizes accurate sampling.
Back-emf zero passage detection algorithm: traditional back-emf zero-crossing examination is the back-emf electricity by comparing detection phase
It presses and is compared with the virtual center point voltage calculated, therefore, it is determined that the generation of zero crossing.Low-voltage, high-current BLDC back-emf mistake
Zero point detection, it is identical as conventional method in detection method.But low-voltage, high-current BLDC motor is due to its low pressure and high current
Characteristic makes it have its particularity during zero-crossing examination.When bridge carries out commutation on BLDC motor, conducting mutually becomes to detect
Phase, since the electric current of motor not can be carried out mutation, at this time detect phase down tube carry out afterflow, detect phase level be clamped at it is low
Level.When bridge similarly being descended to carry out commutation, the upper tube for detecting phase carries out afterflow, and the level for detecting phase is clamped at high level.Low pressure
High current BLDC motor leads to that change of current speed is slow, electric current then needs greatly the longer time to carry out in commutation process since voltage is low
The change of current causes its whole commutation time long, commutation deadline point is easy to cause to be later than back-emf voltage detecting time point.At this
The back-emf voltage detected in the case of kind is not virtual voltage, but must trigger commutation, and so as to cause accidentally commutation, detection is lost
It loses.The present invention proposes a kind of method for increasing a window filter, solution on the basis of traditional back-emf zero passage detection method
Certainly lead to the method for commutation failure by above-mentioned reason.Specific practice is increased when every phase enters the opposite potential zero-crossing examination
Add a time delay process (adjusting with specific reference to time of afterflow), execute zero-crossing examination again after the completion of time delay process, thus will
The test point that may cause accidentally commutation filters out except detection window.
Claims (1)
1. low-voltage, high-current BLDC winding back emf zero passage detection method, it is characterised in that method includes the following steps:
It designs sample circuit: the sample mode of traditional electric resistance partial pressure power-up capacitor filter is changed to directly adopt using electric resistance partial pressure
Sample, and without the mode of capacitor filtering；
Design sample mode: modification PWM multi-carrier modulation scheme realizes the intermediate point sampling be connected in PWM using triangular wave carrier
Back-emf voltage realizes accurate sampling；
Back-emf zero passage detection: is compared by comparing the back-emf voltage of detection phase and the virtual center point voltage of calculating
Compared with therefore, it is determined that the generation of zero crossing；When wherein every phase enters the opposite potential zero-crossing examination, increase a time delay process,
Zero-crossing examination is executed again after the completion of time delay process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811617023.1A CN109687778A (en) | 2018-12-28 | 2018-12-28 | Low-voltage, high-current BLDC winding back emf zero passage detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811617023.1A CN109687778A (en) | 2018-12-28 | 2018-12-28 | Low-voltage, high-current BLDC winding back emf zero passage detection method |
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| CN109687778A true CN109687778A (en) | 2019-04-26 |
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| CN201811617023.1A Pending CN109687778A (en) | 2018-12-28 | 2018-12-28 | Low-voltage, high-current BLDC winding back emf zero passage detection method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110535378A (en) * | 2019-08-27 | 2019-12-03 | 江苏科技大学 | Brshless DC motor high-precision changes facies-controlled method and system |
| CN112350624A (en) * | 2019-08-07 | 2021-02-09 | 茂达电子股份有限公司 | Motor driving system and method |
| CN113224986A (en) * | 2021-05-17 | 2021-08-06 | 深圳市航顺芯片技术研发有限公司 | DC brushless motor and control method of DC brushless motor |
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Application publication date: 20190426 |