CN104579106A - Single-resistor sampling phase-shifting compensation method and system - Google Patents
Single-resistor sampling phase-shifting compensation method and system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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Abstract
The invention provides a single-resistor sampling phase-shifting compensation method. The method collects the bus current through a sampling resistor arranged on a bus of a variable-frequency three-phase inverter circuit, and comprises the following steps: Tb-Ta = T1 and Tc-Tb = T2 were calculated, respectively; judging whether T1 is smaller than Tmin, if yes, sampling a first phase current after phase shift compensation; if not, directly sampling the first phase current; judging whether T2 is smaller than Tmin, if yes, sampling a first phase current after phase shift compensation; if not, the second phase current is directly sampled. The invention also provides a single-resistor sampling phase-shifting compensation system based on the same inventive concept. The single-resistor sampling phase-shift compensation method and the system perform phase-shift compensation on the duty ratio when the sampling time is short, so that the voltage phase is not distorted, the duty ratio is not changed, and the control is accurate. Therefore, the problem that the control is inaccurate due to duty ratio change when the sampling time is short in the traditional scheme is solved.
Description
Technical field
The present invention relates to single resistance sampling technical field, particularly relate to a kind of single resistance sampling phase-shift compensation method and system.
Background technology
Single resistance sampling realizes carving sampling twice when appropriate on a sampling resistor due to needs, obtains biphase current, thus obtains third phase electric current.But when the sampling time is shorter, sampling biphase current becomes very difficult, so need to solve this difficult problem.
Existing scheme, when the sampling time is shorter, can adopt duty ratio compensation method, increases by maximum duty cycle, and minimum duty cycle reduces.But this scheme can cause voltage-phase to distort, change in duty cycle controls inaccurate.
Summary of the invention
Based on this, be necessary for traditional scheme when the sampling time is shorter, change in duty cycle causes controlling inaccurate problem, provides a kind of when the sampling time is shorter, the unchanged and single resistance sampling phase-shift compensation method and system of precise control of duty ratio.
For achieving the above object, the present invention adopts following technical scheme:
A kind of single resistance sampling phase-shift compensation method, gathers bus current by the sampling resistor that frequency conversion three-phase inverting circuit bus is arranged, comprises the steps:
Calculate Tb-Ta=T1 and Tc-Tb=T2 respectively;
Judge whether T1 is less than Tmin, if so, then carry out phase-shift compensation post-sampling first-phase electric current; If not, then Direct Sampling first-phase electric current;
Judge whether T2 is less than Tmin, if so, then carry out phase-shift compensation post-sampling second-phase electric current; If not, then Direct Sampling second-phase electric current;
Wherein, described Ta is the minimal time value that U, V, W three-phase sends duty cycle control signal;
Described Tb is the time median that U, V, W three-phase sends duty cycle control signal;
Described Tc is the time maximum that U, V, W three-phase sends duty cycle control signal;
The minimal sampling time of described Tmin needed for sampling.
Wherein in an embodiment, further comprising the steps of:
Obtain and store the value of Ta, Tb, Tc and Tmin.
Wherein in an embodiment, if when T1 is less than Tmin, phase-shift compensation is: Ta1=Ta+ [Tmin-(Tb-Ta)], Ta2=Ta-[Tmin-(Tb-Ta)];
Wherein, Ta1 is that after U, V, W three-phase sends the minimal time value phase shift of duty cycle control signal, rising edge sends the time;
Ta2 be after U, V, W three-phase sends the minimal time value phase shift of duty cycle control signal low level along the duration.
Wherein in an embodiment, if when T2 is less than Tmin, phase-shift compensation is: Tc1=Tc+ [Tmin-(Tc-Tb)], Tc2=Tc-[Tmin-(Tc-Tb)];
Wherein, Tc1 is that after U, V, W three-phase sends the time maximum phase shift of duty cycle control signal, rising edge sends the time;
Tc2 be after U, V, W three-phase sends the time maximum phase shift of duty cycle control signal low level along the duration.
Present invention also offers the one list resistance sampling phase-shift compensation system based on same inventive concept, comprise computing module, the first judge module and the second judge module;
Described computing module is for calculating Tb-Ta=T1 and Tc-Tb=T2;
Described first judge module is for judging whether T1 is less than Tmin; If so, phase-shift compensation post-sampling first-phase electric current is then carried out, otherwise sampling first-phase electric current;
Described second judge module is for judging whether T2 is less than Tmin; If so, phase-shift compensation post-sampling first-phase electric current is then carried out, otherwise sampling second-phase electric current;
Wherein, described Ta is the minimal time value that U, V, W three-phase sends duty cycle control signal;
Described Tb is the time median that U, V, W three-phase sends duty cycle control signal;
Described Tc is the time maximum that U, V, W three-phase sends duty cycle control signal;
The minimal sampling time of described Tmin needed for sampling.
Wherein in an embodiment, single resistance sampling phase-shift compensation system also comprises the first memory module and the second memory module;
Described first memory module is for storing the value of Ta, Tb, Tc and Tmin of acquisition;
Described second memory module is for storing the value of T1, T2.
Wherein in an embodiment, single resistance sampling phase-shift compensation system also comprises the first Executive Module, for performing phase-shift compensation: Ta1=Ta+ [Tmin-(Tb-Ta)] when T1 is less than Tmin, Ta2=Ta-[Tmin-(Tb-Ta)];
Wherein, Ta1 is that after U, V, W three-phase sends the minimal time value phase shift of duty cycle control signal, rising edge sends the time;
Ta2 be after U, V, W three-phase sends the minimal time value phase shift of duty cycle control signal low level along the duration.
Wherein in an embodiment, single resistance sampling phase-shift compensation system also comprises the second Executive Module, for performing phase-shift compensation: Tc1=Tc+ [Tmin-(Tc-Tb)] when T2 is less than Tmin, Tc2=Tc-[Tmin-(Tc-Tb)];
Wherein, Tc1 is that after U, V, W three-phase sends the time maximum phase shift of duty cycle control signal, rising edge sends the time;
Tc2 be after U, V, W three-phase sends the time maximum phase shift of duty cycle control signal low level along the duration.
The invention has the beneficial effects as follows:
Single resistance sampling phase-shift compensation method and system of the present invention, when the sampling time is shorter, carry out phase-shift compensation to duty ratio, thus make voltage-phase undistorted, duty ratio is unchanged, thus makes precise control.So just overcome traditional scheme when the sampling time is shorter, change in duty cycle makes to control inaccurate problem.
Accompanying drawing explanation
Fig. 1 is the program flow diagram of single resistance sampling phase-shift compensation method one embodiment of the present invention;
Fig. 2 is the system block diagram of single resistance sampling phase-shift compensation system one embodiment of the present invention;
Fig. 3 is the hardware circuit diagram of single resistance sampling phase-shift compensation method and system of the present invention;
Fig. 4 is the application schematic diagram of single resistance sampling phase-shift compensation method one embodiment of the present invention.
Embodiment
In order to make technical scheme of the present invention clearly, below in conjunction with accompanying drawing, single resistance sampling phase-shift compensation method and system of the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain that the present invention is not intended to limit the present invention.
See Fig. 1 to Fig. 4, be illustrated in figure 3 the hardware circuit diagram of single resistance sampling phase-shift compensation method and system of the present invention.This hardware circuit diagram is typical frequency conversion three-phase inverting circuit, and wherein, sampling resistor R1 is positioned on bus, sampling bus current.Q1 is brachium pontis UP switching tube in U phase, and Q2 is brachium pontis UN switching tube under U phase.Q3 is brachium pontis VP switching tube in V phase, and Q4 is brachium pontis VN switching tube under V phase.Q5 is brachium pontis WP switching tube in W phase, and Q6 is brachium pontis WN switching tube under W phase.D1, D2, D3, D4, D5, D6 are diode, for providing continuous current circuit for inductive load commutation course.Be noted that inductive load is herein machine winding coil.Sampling resistor R1 gathers biphase current, then can be able to U, V, W three-phase current by electric current reconstructing, thus motor is controlled.
Be illustrated in figure 1 the program flow diagram of single resistance sampling phase-shift compensation method one embodiment of the present invention, comprise the steps:
S100, respectively calculating Tb-Ta=T1 and Tc-Tb=T2.
Wherein, Ta is the minimal time value that U, V, W three-phase sends duty cycle control signal; Tb is the time median that U, V, W three-phase sends duty cycle control signal; Tc is the time maximum that U, V, W three-phase sends duty cycle control signal.Like this for multilevel iudge provides Data Source accurately.
S200, judge whether T1 is less than Tmin, if so, then carry out phase-shift compensation post-sampling first-phase electric current; If not, then Direct Sampling first-phase electric current.
S300, judge whether T2 is less than Tmin, if so, then carry out phase-shift compensation post-sampling second-phase electric current; If not, then Direct Sampling second-phase electric current.
Wherein, the minimal sampling time of Tmin needed for sampling.Owing to needing the double sampling realizing carving when appropriate on same sampling resistor R1, obtain biphase current.After the electric current obtaining first-phase so should first sample, then sampling obtains second-phase electric current, is then zero reconstruct third phase electric current according to three-phase current sum.
When the sampling time is shorter, by carrying out phase-shift compensation to duty ratio, thus make voltage-phase undistorted, duty ratio is unchanged, thus makes precise control.So just overcome traditional scheme when the sampling time is shorter, change in duty cycle makes to control inaccurate problem.
Preferably, as a kind of embodiment, before step S100, also step S000 is comprised.
S000, acquisition store the value of Ta, Tb, Tc and Tmin.Before step S100, obtain Ta, Tb, Tc and Tmin, stored and call for step S100 and calculate in memory.
Preferably, as a kind of embodiment, step S200 also comprises step S201.
If when S201 T1 is less than Tmin, phase-shift compensation is: Ta1=Ta+ [Tmin-(Tb-Ta)], Ta2=Ta-[Tmin-(Tb-Ta)];
Wherein, Ta1 is that after U, V, W three-phase sends the minimal time value phase shift of duty cycle control signal, rising edge sends the time;
Ta2 be after U, V, W three-phase sends the minimal time value phase shift of duty cycle control signal low level along the duration.
As T1<Tmin, illustrate that the sampling time is too short, need to carry out phase-shift compensation, concrete phase shift process is: obtain new duty ratio by phase shift and send time Ta1=Ta+ [Tmin-(Tb-Ta)], and after phase shift, low level is along duration T a2=Ta-[Tmin-(Tb-Ta)].Sample again after phase shift, keep duty ratio constant, ensure that the accuracy of control.If T1>Tmin, without the need to compensating, directly sample.
Preferably, as a kind of embodiment, step S300 also comprises step S301.
If when S301 T2 is less than Tmin, phase-shift compensation is: Tc1=Tc+ [Tmin-(Tc-Tb)], Tc2=Tc-[Tmin-(Tc-Tb)];
Wherein, Tc1 is that after U, V, W three-phase sends the time maximum phase shift of duty cycle control signal, rising edge sends the time;
Tc2 be after U, V, W three-phase sends the time maximum phase shift of duty cycle control signal low level along the duration.
As T2<Tmin, illustrate that the sampling time is too short, need to carry out phase-shift compensation, concrete phase shift process is: obtain new duty ratio by phase shift and send time Tc1=Tc+ [Tmin-(Tc-Tb)], and after phase shift, low level is along duration T c2=Tc-[Tmin-(Tc-Tb)].Sample again after phase shift, keep duty ratio constant, ensure that the accuracy of control.If T2>Tmin, without the need to compensating, directly sample.
As the application schematic diagram that Fig. 4 is single resistance sampling phase-shift compensation method one embodiment of the present invention.Wherein, UP, VP, WP are respectively brachium pontis control signal in U, V, W phase.As seen from the figure, Tc>Tb>Ta, because the duty ratio of VP and UP is close, and T1<Tmin, the sampling time is inadequate, so need to carry out phase-shift compensation.As shown in the figure, Ta1=Ta+ after phase shift [Tmin-(Tb-Ta)], and Ta2=Ta-[Tmin-(Tb-Ta)], keep overall duty ratio constant, first-phase electric current of then sampling.Due to T2 > Tmin, without the need to compensating, Direct Sampling second-phase electric current.
Present invention also offers a kind of single resistance sampling phase-shift compensation system based on being same as inventive concept.Be illustrated in figure 2 the system block diagram of single resistance sampling phase-shift compensation system one embodiment of the present invention.Comprise computing module 100, first judge module 200 and the second judge module 300.Wherein, computing module 100 is for calculating Tb-Ta=T1 and Tc-Tb=T2.First judge module 200, for judging whether T1 is less than Tmin, if so, then carries out phase-shift compensation post-sampling first-phase electric current; If not, then Direct Sampling first-phase electric current.Second judge module 300, for judging whether T2 is less than Tmin, if so, then carries out phase-shift compensation post-sampling first-phase electric current; If not, then Direct Sampling second-phase electric current.
Preferably, as a kind of embodiment, also comprise the first memory module 001 and the second memory module 002.First memory module 001 is for storing Ta, Tb, Tc and Tmin of acquisition.Ta, Tb and Tc of acquisition are placed in the first memory module 001, like this for computing module provides Data Source accurately.When computing module 100 carries out computing, only required data message need be obtained from the first memory module 001.Second memory module 002 is for storing T1 and T2.After computing module 100 carries out computing, operation result is stored in the second memory module 002, is stored in the second memory module 002 by T1 and T2, call for the first judge module 200 and the second judge module 300.When the first judge module 200 compares judgement, only need call Tmin from the first memory module 001, from the second memory module 002, obtain T1, then carry out judging.In like manner, when the second judge module 300 compares judgement, only need obtain Tmin from the first memory module 001, from the second memory module 002, obtain T2, then carry out judging.
Preferably, as a kind of embodiment, also comprise the first Executive Module 003 and the second Executive Module 004.First Executive Module 003 for performing phase-shift compensation: Ta1=Ta+ [Tmin-(Tb-Ta)] when T1 is less than Tmin, Ta2=Ta-[Tmin-(Tb-Ta)].Second Executive Module 004 for performing phase-shift compensation: Tc1=Tc+ [Tmin-(Tc-Tb)] when T2 is less than Tmin, Tc2=Tc-[Tmin-(Tc-Tb)].
Single resistance sampling phase-shift compensation method and system of the present invention, when the sampling time is shorter, carry out phase-shift compensation to duty ratio, thus make voltage-phase undistorted, duty ratio is unchanged, thus makes precise control.So just overcome traditional scheme when the sampling time is shorter, change in duty cycle makes to control inaccurate problem.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a single resistance sampling phase-shift compensation method, gathers bus current by the sampling resistor that frequency conversion three-phase inverting circuit bus is arranged, it is characterized in that, comprise the steps:
Calculate Tb-Ta=T1 and Tc-Tb=T2 respectively;
Judge whether T1 is less than Tmin, if so, then carry out phase-shift compensation post-sampling first-phase electric current; If not, then Direct Sampling first-phase electric current;
Judge whether T2 is less than Tmin, if so, then carry out phase-shift compensation post-sampling second-phase electric current; If not, then Direct Sampling second-phase electric current;
Wherein, described Ta is the minimal time value that U, V, W three-phase sends duty cycle control signal;
Described Tb is the time median that U, V, W three-phase sends duty cycle control signal;
Described Tc is the time maximum that U, V, W three-phase sends duty cycle control signal;
The minimal sampling time of described Tmin needed for sampling.
2. single resistance sampling phase-shift compensation method according to claim 1, is characterized in that, further comprising the steps of:
Obtain and store the value of Ta, Tb, Tc and Tmin.
3. single resistance sampling phase-shift compensation method according to claim 2, is characterized in that:
If when T1 is less than Tmin, phase-shift compensation is: Ta1=Ta+ [Tmin-(Tb-Ta)], Ta2=Ta-[Tmin-(Tb-Ta)];
Wherein, Ta1 is that after U, V, W three-phase sends the minimal time value phase shift of duty cycle control signal, rising edge sends the time;
Ta2 be after U, V, W three-phase sends the minimal time value phase shift of duty cycle control signal low level along the duration.
4. single resistance sampling phase-shift compensation method according to claim 2, is characterized in that:
If when T2 is less than Tmin, phase-shift compensation is: Tc1=Tc+ [Tmin-(Tc-Tb)], Tc2=Tc-[Tmin-(Tc-Tb)];
Wherein, Tc1 is that after U, V, W three-phase sends the time maximum phase shift of duty cycle control signal, rising edge sends the time;
Tc2 be after U, V, W three-phase sends the time maximum phase shift of duty cycle control signal low level along the duration.
5. a single resistance sampling phase-shift compensation system, is characterized in that, comprises computing module, the first judge module and the second judge module;
Described computing module is for calculating Tb-Ta=T1 and Tc-Tb=T2;
Described first judge module, for judging whether T1 is less than Tmin, if so, then carries out phase-shift compensation post-sampling first-phase electric current, otherwise Direct Sampling first-phase electric current;
Described second judge module, for judging whether T2 is less than Tmin, if so, then carries out phase-shift compensation post-sampling second-phase electric current, otherwise Direct Sampling second-phase electric current;
Wherein, described Ta is the minimal time value that U, V, W three-phase sends duty cycle control signal;
Described Tb is the time median that U, V, W three-phase sends duty cycle control signal;
Described Tc is the time maximum that U, V, W three-phase sends duty cycle control signal;
The minimal sampling time of described Tmin needed for sampling.
6. single resistance sampling phase-shift compensation system according to claim 5, is characterized in that:
Also comprise the first memory module and the second memory module;
Described first memory module is for storing the value of Ta, Tb, Tc and Tmin of acquisition;
Described second memory module is for storing the value of T1, T2.
7. single resistance sampling phase-shift compensation system according to claim 6, is characterized in that:
Also comprise the first Executive Module, for performing phase-shift compensation: Ta1=Ta+ [Tmin-(Tb-Ta)] when T1 is less than Tmin, Ta2=Ta-[Tmin-(Tb-Ta)];
Wherein, Ta1 is that after U, V, W three-phase sends the minimal time value phase shift of duty cycle control signal, rising edge sends the time;
Ta2 be after U, V, W three-phase sends the minimal time value phase shift of duty cycle control signal low level along the duration.
8. single resistance sampling phase-shift compensation system according to claim 7, is characterized in that:
Also comprise the second Executive Module, for performing phase-shift compensation: Tc1=Tc+ [Tmin-(Tc-Tb)] when T2 is less than Tmin, Tc2=Tc-[Tmin-(Tc-Tb)];
Wherein, Tc1 is that after U, V, W three-phase sends the time maximum phase shift of duty cycle control signal, rising edge sends the time;
Tc2 be after U, V, W three-phase sends the time maximum phase shift of duty cycle control signal low level along the duration.
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