CN106872766A - A kind of phase-shift compensation method of single resistor current sampling - Google Patents
A kind of phase-shift compensation method of single resistor current sampling Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention discloses a kind of phase-shift compensation method of single resistor current sampling, including S20), judge that whether T1+T2, more than 2*Tmin, in this way, performs step S31), if not being, execution step S32)；S31), judge that whether T1, more than or equal to Tmin, in this way, performs step S41), if not being, step S41 is performed after mutually compensating middle phase shift)；S32), judge that whether T1, more than or equal to Tmin, in this way, performs step S42), if not being, to performing step S42 after maximum phase phase-shift compensation)；S41), judge that whether T2, more than or equal to Tmin, in this way, performs step S51), if not being, step S51 is performed after mutually compensating middle phase shift)；S42), judge that whether T2, more than or equal to Tmin, in this way, performs step S52), if not being, step S52 is performed after mutually compensating minimum phase shift)；S51), in the both sides sampling of maximum phase and minimum phase；S52), in the homonymy sampling of maximum phase and interphase；Present invention ensure that meet it is more than minimum current sampling time Tmin all the time, so as to sampling blind area is completely eliminated.
Description
Technical field
The present invention relates to single resistor current sampling field, and in particular to a kind of phase-shift compensation side of single resistor current sampling
Method.
Background technology
The operation principle of single resistor current Sampling techniques is calculated by appropriate using the sampling resistor for being installed in dc bus
Method realizes that motor three-phase current is sampled.The technology saves sampling channel all the way compared with traditional two resistance samplings technology, can enter
The cost and volume of one step reduction electric machine controller.But there is controller MCU less than minimum electricity in single resistor current Sampling techniques
Flow the situation in sampling time Tmin, it is therefore desirable to which phase-shift compensation is carried out to dutycycle.
It is existing more on single resistance sampling to ensure that controller MCU meets the condition more than minimal sampling time Tmin
The technology of phase-shift compensation method is disclosed.Chinese invention patent such as Publication No. CN104579106A discloses a kind of single resistance and adopts
Sample phase-shift compensation method, the method gathers bus current by the sampling resistor set on frequency conversion three-phase inverting circuit bus,
When sampling time is shorter, the pwm signal to largest duty cycle phase or minimum phase carries out phase-shift compensation, makes voltage duty cycle without change
Change.Traditional scheme is thus overcome when the sampling time is shorter, change in duty cycle causes the inaccurate problem of control.But
Under the extreme operating condition of high speed operation of motor, prior art has phase shift anyway cannot be met when being sampled more than minimum current
Between Tmin conditions sampling blind area, cause current sample forbidden.
And for example the Chinese invention patent of Publication No. CN105450094A discloses a kind of current sample method and air-conditioning sets
Standby, by judging whether sample rate current is effective current, if it is determined that n-th is sampled, corresponding sample rate current is invalid, by (n-1)th time
The sample rate current that the current estimation value of the sample rate current of sampling is sampled as n-th；For another example Publication No. CN106208826A
Chinese invention patent also discloses that a kind of ovennodulation control method without three-phase current sensor for permagnetic synchronous motor, carries
Go out in single resistance sampling, change reference voltage, three-phase is moved；Algorithm is not only complicated, and equally exists motor at a high speed
Under the extreme operating condition of operation, there is phase shift anyway cannot meet sampling more than minimum current sampling time Tmin conditions
Blind area, causes current sample to be forbidden.
Therefore need to seek a kind of phase-shift compensation method of single resistor current sampling to ensure the controller MCU sampling times
All the time meet and be more than minimum current sampling time Tmin, so as to single resistor current sampling blind area is completely eliminated.
The content of the invention
In view of this, it is an object of the invention to propose a kind of phase-shift compensation method of single resistor current sampling, by closing
Suitable algorithm flexibly effectively moves dutycycle, it is ensured that the controller MCU sampling times met more than the minimum current sampling time all the time
Tmin, so as to single resistor current sampling blind area is completely eliminated, on this basis, the present invention is also proposed according to using unilateral or bilateral
Sample mode, on the basis of further ensuring that the single resistor current sampling blind area of elimination, and furthermore achieved that flexibly sampling, fit
It is wide with scope；Algorithm of the invention is simply easily implemented simultaneously, can be used for the various motor controls such as air-conditioning, refrigerator, electric bicycle
In system.
The technical solution adopted by the present invention is as follows：
A kind of phase-shift compensation method of single resistor current sampling, described method comprises the following steps：
S10 T1 and T2), are determined according to Ta, Tb and Tc, wherein, T1 is that the first sampled point coordinates the time, and T2 is the second sampling
Point cooperation time, Ta is the corresponding duty cycle time of largest duty cycle in a, b, c three-phase PWM signal, and Tb is a, b, c three-phase
The corresponding duty cycle time of dutycycle interphase in pwm signal, Tc be a, b, c three-phase PWM signal in dutycycle minimum it is corresponding
Duty cycle time；
S20 whether T1+T2), is judged more than 2*Tmin, if it is, performing step S31), if it is not, performing step
S32), wherein, Tmin be the minimum current sampling time；
S31 whether T1), is judged more than or equal to Tmin, if it is, performing step S41), if it is not, being accounted for described
Sky performs step S41 after carrying out phase-shift compensation than interphase)；
S32 whether T1), is judged more than or equal to Tmin, if it is, performing step S42), if it is not, being accounted for described
Sky performs step S42 after mutually carrying out phase-shift compensation than maximum)；
S41 whether T2), is judged more than or equal to Tmin, if it is, performing step S51), if it is not, being accounted for described
Sky performs step S51 after carrying out phase-shift compensation than interphase)；
S42 whether T2), is judged more than or equal to Tmin, if it is, performing step S52), if it is not, being accounted for described
Sky performs step S52 after mutually carrying out phase-shift compensation than minimum)；
S51), sampled in the both sides of described largest duty cycle phase and described dutycycle minimum phase, completed single electricity
Resistance current sample；
S52), the homonymy in described largest duty cycle phase and described dutycycle interphase is sampled, and completes single electricity
Resistance current sample.
Preferably, in step S10) before also include step S00), described step S00) refer to determine and be input into Ta,
The value of Tb, Tc and Tmin.
Preferably, T1=(Ta-Tb)/2, T2=(Tc-Tb)/2.
Preferably, in described step S31) in, it refers to described that phase-shift compensation is carried out to described dutycycle interphase
Dutycycle interphase moves to right Tmin-T1.
Preferably, in described step S32) in, it refers to described that phase-shift compensation is mutually carried out to described largest duty cycle
Largest duty cycle mutually moves to left Tmin-T1.
Preferably, in described step S41) in, it refers to described that phase-shift compensation is carried out to described dutycycle interphase
Dutycycle interphase moves to right Tmin-T2.
Preferably, in described step S42) in, it refers to described mutually to carry out phase-shift compensation to described dutycycle minimum
Dutycycle minimum mutually moves to right Tmin-T2.
Advantages of the present invention：The present invention coordinates time T1 and the second sampled point to coordinate the feelings of time T2 according to the first sampled point
Condition carries out spirit by appropriate algorithm to dutycycle interphase or largest duty cycle phase/two kinds of different modes of dutycycle minimum phase shift phase
Phase-shift compensation living, it is ensured that the controller MCU sampling times meet more than minimum current sampling time Tmin all the time, so as to realize in electricity
Machine gamut traffic coverage no current sampling blind area；On this basis, the present invention also proposes to be adopted according to using unilateral or bilateral
Sample loading mode, on the basis of further ensuring that the single resistor current sampling blind area of elimination, and furthermore achieved that flexibly sampling, be applicable model
Enclose wide；Algorithm of the invention is simply easily implemented simultaneously, can be used for the various electric machine control systems such as air-conditioning, refrigerator, electric bicycle
In.
Brief description of the drawings
Accompanying drawing 1 is the three-phase PWM signal schematic diagram of the embodiment of the present invention；
Accompanying drawing 2 is the unilateral sampling schematic diagram of the embodiment of the present invention；
Accompanying drawing 3 is the bilateral sampling schematic diagram of the embodiment of the present invention；
Accompanying drawing 4 is the phase-shift compensation algorithm flow chart of the embodiment of the present invention；
Accompanying drawing 5 is the phase-shift compensation schematic diagram when T1+T2 is less than Tmin more than 2*Tmin and T1 under the embodiment of the present invention；
Accompanying drawing 6 is phase-shift compensation schematic diagram of the embodiment of the present invention when T1+T2 is more than 2*Tmin and T2 is less than Tmin；
Accompanying drawing 7 is phase-shift compensation schematic diagram of the embodiment of the present invention when T1+T2 is less than 2*Tmin and T1 is less than Tmin；
Accompanying drawing 8 is phase-shift compensation schematic diagram of the embodiment of the present invention when T1+T2 is less than 2*Tmin and T2 is less than Tmin.
Specific embodiment
The embodiment of the invention discloses a kind of phase-shift compensation method of single resistor current sampling, method comprises the following steps：
S10 T1 and T2), are determined according to Ta, Tb and Tc, wherein, T1 is that the first sampled point coordinates the time, when T2 is that the second sampled point coordinates
Between, Ta is the corresponding duty cycle time of largest duty cycle in a, b, c three-phase PWM signal, and Tb is in a, b, c three-phase PWM signal
The corresponding duty cycle time of dutycycle interphase, when Tc is for the corresponding dutycycle of dutycycle minimum in a, b, c three-phase PWM signal
Between；S20 whether T1+T2), is judged more than 2*Tmin, if it is, performing step S31), if it is not, performing step S32), its
In, Tmin is the minimum current sampling time；S31 whether T1), is judged more than or equal to Tmin, if it is, performing step S41),
If it is not, performing step S41 after phase-shift compensation is carried out to described dutycycle interphase)；S32), judge T1 whether be more than or
Equal to Tmin, if it is, performing step S42), if it is not, being performed after phase-shift compensation is mutually carried out to described largest duty cycle
Step S42)；S41 whether T2), is judged more than or equal to Tmin, if it is, performing step S51), if it is not, to described
Dutycycle interphase performs step S51 after carrying out phase-shift compensation)；S42 whether T2), is judged more than or equal to Tmin, if it is,
Perform step S52), if it is not, performing step S52 after mutually carrying out phase-shift compensation to described dutycycle minimum)；S51), exist
Described largest duty cycle phase and the both sides of described dutycycle minimum phase are sampled, and complete single resistor current sampling；S52)、
Sampled in the homonymy of described largest duty cycle phase and described dutycycle interphase, completed single resistor current sampling.
The embodiment of the present invention coordinates time T1 and the second sampled point to coordinate the situation of time T2 according to the first sampled point, passes through
Appropriate algorithm carries out flexible phase shift to dutycycle interphase or largest duty cycle phase/two kinds of different modes of dutycycle minimum phase shift phase
Compensation, it is ensured that the controller MCU sampling times meet more than minimum current sampling time Tmin all the time, so as to realize in the full model of motor
Enclose traffic coverage no current sampling blind area；On this basis, the embodiment of the present invention also proposes to be adopted according to using unilateral or bilateral
Sample loading mode, on the basis of further ensuring that the single resistor current sampling blind area of elimination, and furthermore achieved that flexibly sampling, be applicable model
Enclose wide；The algorithm of the embodiment of the present invention is simply easily implemented simultaneously, can be used for the various motor controls such as air-conditioning, refrigerator, electric bicycle
In system processed.
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments described in invention, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Embodiment of the present invention three-phase PWM signal schematic diagram as shown in Figure 1, Ta is dutycycle in a, b, c three-phase PWM signal
The corresponding duty cycle time of maximum phase (i.e. a phases), Tb be a, b, c three-phase PWM signal in dutycycle interphase (i.e. b phases) it is corresponding
Duty cycle time, Tc is dutycycle minimum phase (i.e. c phases) corresponding duty cycle time in a, b, c three-phase PWM signal；Such as Fig. 2 institutes
The unilateral sampling schematic diagram of the embodiment of the present invention shown, wherein, T1 is that the first sampled point coordinates the time, and T2 matches somebody with somebody for the second sampled point
Conjunction time, the unilateral sampling in the embodiment of the present invention refers to be sampled in the homonymy of a phases and b phases, i.e., first shown in Fig. 2 is adopted
Sampling point and the second sampled point；The bilateral sampling schematic diagram of the embodiment of the present invention as shown in Figure 3, wherein, T1 is the first sampled point
Cooperation time, T2 is that the second sampled point coordinates the time, and the bilateral sampling in the embodiment of the present invention refers in the both sides of a phases and c phases
The first sampled point and the second sampled point sampled i.e. shown in Fig. 3.
With reference to Fig. 1, Fig. 2 and Fig. 3, with further reference to shown in Fig. 4, a kind of phase-shift compensation method of single resistor current sampling,
Described method comprises the following steps：
S00), determine and be input into the value of Ta, Tb, Tc and Tmin, wherein, Tmin is the minimum current sampling time；
S10 T1 and T2), are determined according to Ta, Tb and Tc, particularly preferably, T1=(Ta-Tb)/2, T2=(Tc-Tb)/2；
S20 whether T1+T2), is judged more than 2*Tmin, if it is, performing step S31), if it is not, performing step
S32)；
S31 whether T1), is judged more than or equal to Tmin, if it is, performing step S41), if it is not, being carried out to b phases
Step S41 is performed after phase-shift compensation), specifically, in the present embodiment, it refers to that b phases move to right Tmin- that phase-shift compensation is carried out to b phases
T1；
S32 whether T1), is judged more than or equal to Tmin, if it is, performing step S42), if it is not, being carried out to a phases
Step S42 is performed after phase-shift compensation), specifically, in the present embodiment, it refers to that a phases move to left Tmin- that phase-shift compensation is carried out to a phases
T1；
S41 whether T2), is judged more than or equal to Tmin, if it is, performing step S50), if it is not, being carried out to b phases
Step S50 is performed after phase-shift compensation), specifically, in the present embodiment, it refers to that b phases move to right Tmin- that phase-shift compensation is carried out to b phases
T2；
S42 whether T2), is judged more than or equal to Tmin, if it is, performing step S50), if it is not, being carried out to c phases
Step S50 is performed after phase-shift compensation), specifically, in the present embodiment, it refers to that c phases move to right Tmin- that phase-shift compensation is carried out to c phases
T2；
S51), sampled in the both sides of largest duty cycle phase and dutycycle minimum phase, completed single resistor current sampling；
S52), the homonymy in largest duty cycle phase and dutycycle interphase is sampled, and completes single resistor current sampling.
When T1 or T2 is less than minimum current sampling time Tmin, it is necessary to which the dutycycle to pwm signal carries out phase-shift compensation,
To ensure that controller MCU has time enough to complete current sample；Please with further reference to shown in Fig. 5, Fig. 6, Fig. 7 and Fig. 8
Phase-shift compensation schematic diagram under different condition, when T1+T2 is more than 2*Tmin and T1 is less than Tmin, b phases move to right Tmin-T1, this
When motor be in high-speed cruising operating mode；When T1+T2 is more than 2*Tmin and T2 is less than Tmin, b phases move to right Tmin-T2, now electricity
Machine is in high-speed cruising operating mode；When T1+T2 is less than 2*Tmin and T1 is less than Tmin, a phases move to left Tmin-T1, now at motor
In low cruise operating mode；When T1+T2 is less than 2*Tmin and T2 is less than Tmin, c phases move to right Tmin-T2, and now motor is in low
Fast operating condition；Flexible compensation is carried out to the phase shift of b phases or a phases/c phases phase shift by such algorithm, it is ensured that when controller MCU samples
Between all the time meet be more than minimum current sampling time Tmin.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be in other specific forms realized.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires to be limited rather than described above, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as the claim involved by limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each implementation method is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Specification an as entirety, the technical scheme in each embodiment can also be formed into those skilled in the art through appropriately combined
May be appreciated other embodiment.
Claims (7)
1. a kind of phase-shift compensation method that single resistor current is sampled, it is characterised in that described method comprises the following steps：
S10 T1 and T2), are determined according to Ta, Tb and Tc, wherein, T1 is that the first sampled point coordinates the time, and T2 matches somebody with somebody for the second sampled point
Conjunction time, Ta is the corresponding duty cycle time of largest duty cycle in a, b, c three-phase PWM signal, and Tb is that a, b, c three-phase PWM are believed
The corresponding duty cycle time of dutycycle interphase in number, Tc is the minimum corresponding duty of dutycycle in a, b, c three-phase PWM signal
Compare the time；
S20 whether T1+T2), is judged more than 2*Tmin, if it is, performing step S31), if it is not, performing step S32), its
In, Tmin is the minimum current sampling time；
S31 whether T1), is judged more than or equal to Tmin, if it is, performing step S41), if it is not, to described dutycycle
Interphase performs step S41 after carrying out phase-shift compensation)；
S32 whether T1), is judged more than or equal to Tmin, if it is, performing step S42), if it is not, to described dutycycle
Maximum performs step S42 after mutually carrying out phase-shift compensation)；
S41 whether T2), is judged more than or equal to Tmin, if it is, performing step S51), if it is not, to described dutycycle
Interphase performs step S51 after carrying out phase-shift compensation)；
S42 whether T2), is judged more than or equal to Tmin, if it is, performing step S52), if it is not, to described dutycycle
Minimum performs step S52 after mutually carrying out phase-shift compensation)；
S51), sampled in the both sides of described largest duty cycle phase and described dutycycle minimum phase, completed single resistance electricity
Stream sampling；
S52), the homonymy in described largest duty cycle phase and described dutycycle interphase is sampled, and completes single resistance electricity
Stream sampling.
2. the phase-shift compensation method that list resistor current as claimed in claim 1 is sampled, it is characterised in that in step S10) before
Also include step S00), described step S00) refer to the value for determining and being input into Ta, Tb, Tc and Tmin.
3. the phase-shift compensation method that list resistor current as claimed in claim 1 is sampled, it is characterised in that T1=(Ta-Tb)/2,
T2=(Tc-Tb)/2.
4. the phase-shift compensation method that list resistor current as claimed in claim 1 is sampled, it is characterised in that in described step
S31 in), it refers to that described dutycycle interphase moves to right Tmin-T1 that phase-shift compensation is carried out to described dutycycle interphase.
5. the phase-shift compensation method that list resistor current as claimed in claim 1 is sampled, it is characterised in that in described step
S32 in), it refers to that described largest duty cycle mutually moves to left Tmin-T1 that phase-shift compensation is mutually carried out to described largest duty cycle.
6. the phase-shift compensation method that list resistor current as claimed in claim 1 is sampled, it is characterised in that in described step
S41 in), it refers to that described dutycycle interphase moves to right Tmin-T2 that phase-shift compensation is carried out to described dutycycle interphase.
7. the phase-shift compensation method that list resistor current as claimed in claim 1 is sampled, it is characterised in that in described step
S42 in), it refers to that described dutycycle minimum mutually moves to right Tmin-T2 that phase-shift compensation is mutually carried out to described dutycycle minimum.
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| CN108712130A (en) * | 2018-06-15 | 2018-10-26 | Tcl空调器(中山)有限公司 | Single resistor current sampling transposition control method, device, equipment and storage medium |
| CN109188046A (en) * | 2018-07-05 | 2019-01-11 | 广东高标电子科技有限公司 | Single resistance current of electric method of sampling, motor-drive circuit and readable storage medium storing program for executing |
| CN111525868A (en) * | 2020-05-09 | 2020-08-11 | 苏俊 | Phase shifting method and system for three-phase inverter and readable storage medium |
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| CN111525868A (en) * | 2020-05-09 | 2020-08-11 | 苏俊 | Phase shifting method and system for three-phase inverter and readable storage medium |
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| CN106872766B (en) | 2019-04-02 |
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