CN100361381C - Converter and method for determining a current space vector - Google Patents
Converter and method for determining a current space vector Download PDFInfo
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- CN100361381C CN100361381C CNB028209427A CN02820942A CN100361381C CN 100361381 C CN100361381 C CN 100361381C CN B028209427 A CNB028209427 A CN B028209427A CN 02820942 A CN02820942 A CN 02820942A CN 100361381 C CN100361381 C CN 100361381C
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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
- H02M7/53871—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 with automatic control of output voltage or current
- H02M7/53873—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 with automatic control of output voltage or current with digital control
Abstract
The invention relates to a converter and to a method for determining a current space vector for a converter that can be operated with pulse-width modulation, comprising signaling electronics and a power final stage that comprises power circuit breakers situated in three half bridges each of which comprising a lower and an upper branch. Means for detecting the respective currents are situated either in all three lower or in all three upper branches of the half bridges. At least one associated current sampled value is determined within a time segment by using two of the three means provided for detecting the currents. A current space vector is formed from the current sampled values determined by this pair of means or the current values are formed in the output branches, in particular, for use in a control and/or regulating method. Said pair of means is selected differently according to the output voltage space vector.
Description
Technical field
The present invention relates to the method for a kind of current transformer and a kind of definite current space vector.
Background technology
Drive in the wide modulation of output voltage lateral vein, have in the digital regulated current transformer, in order to reach enough qualities of regulation, must determine such current space vector value for pulse width modulation cycle, mean value this space vector and in esse current space vector, that this pulse width modulation cycle is got is consistent.The output voltage of pulse-width modulation under the situation of inductive load, such as under the situation particularly at motor, cause so-called current fluctuation.Must not be subjected to current fluctuation to determine current space vector with influencing.Current sensor is arranged in the feed line of motor in some current transformers of prior art, produces continuous current signal thus, draws this current signal and can be used for adjustment then from current fluctuation by the filter of simulating.
(second edition 110-113 page or leaf in 1999) discloses the current transformer that pulse-width modulation drives from the book " Praxis derfeldorientierten Drehstromantriebsregelung " of Nguyen Phung quang and J rg-Andreas Dittrich, and regulation is by means of the current detecting of the current sensor of three (illustration 5.1) in the output branch road or only two (illustration 5.3,5.5,5.6,5.9,5.11) current potential separation in this current transformer.This is determined to have the current space vector (illustration 5.3,5.5,5.6,5.9,5.11) of two degrees of freedom from current measurement value.Illustrate on these external 76 to 77 pages,, carve in due course and detect current measurement value in order to detect the first-harmonic that does not have harmonic wave, just do not have the current of electric of current fluctuation.Deviation to this and first-harmonic is called the difference current space vector.Certainly carry out the detection of current measurement value at the zero crossing of difference current space vector.Shortcoming is in this known current transformer, must current measuring unit at least two costlinesses, that current potential separates.
From DE196 81 189T1, disclose one have intermediate circuit/coupling circuit electric capacity (Zwischenkreiskondensator) (Fig. 1, reference symbol 3) but the pulse-width modulation current transformer and an output stage that is connected with this current transformer that drive, this output stage only comprises a current sensor and is used to detect the intermediate circuit electric current.This current detecting therefore by the angle of output voltage vector comprise about single phase current or phase current and information.Be under the situation of definite angle of output voltage vector, to determine current space vector unsatisfactorily to this shortcoming.
A known current transformer from the works " Low cost current Sonsing in DSPBased Drives " of Francesco Parasiliti, Industrial Electronics, 1999, ISIE ' 99, IEEE procceedings, the 3rd volume in 1999, international symposium 1999 the 3rd volume, in this current transformer shunt resistance as the arrangements of cells that detects electric current separately below all of half-bridge in the branch road.Detect all three current measurement values, wherein measurement triggering is in the centre of such time period of pulse width modulation cycle inside, has discrete on off state (000), just zero vector V in this time period
0(1287 pages, left column, Fig. 7).In specific embodiment, less time deviation is arranged owing to consider dead time, signal running time/group delay time (Signallaufzeiten) and this type of time and this centre.From attached measured value, determine current space vector then.To this shortcoming yes in hexagonal shade scope (1287 pages, left column, final stage, Fig. 8) can not or only can inaccurately determine current space vector, because in this shade scope, do not use zero vector or only use zero vector very momently.If zero vector does not exist or only existence very momently, therefore in a phase place, do not have current measurement signal naturally or have a very of short duration current measurement signal, so this current measurement signal can not be used for or only inaccurately be used for calculating.Cause thus, under the situation of the output voltage space vector that pulse width modulation cycle is averaged in the shade scope (1287 pages Fig. 8) have been distorted a current measurement value at least.
Disclose a current transformer from US5 815 391, the arrangements of cells that detects electric current separately in this current transformer is below all of half-bridge in the branch road (Fig. 2).Explanation in attached table (Fig. 2 B) depends on that on off state can measure (for example first row: can measure) or can calculate electric current among (the 5th row: can calculate) phase place A from two other current measurement values.If open the following switch of phase place A and other following switch, then can not determine the current value of phase place A.So on off state is called in phase place A ' the unknown ' in this article.
The above-mentioned table 2B and the problem of narration relate on off state, just the instantaneous state separately of current transformer.Above-mentioned table 2B only relates to phase place A.List the attached table of phase place B and C.This is found out easily, at some on off states, just can not determine current value or only can determine a current value under the situation of (111), (110), (101), (011), and therefore definitely can not determine the space current vector of this instantaneous state.Therefore can not draw from US5 815 391 and how determine such current space vector, it is consistent with mean value in esse current space vector, that pulse width modulation cycle is got.Particularly do not describe, take how measure, so that because current fluctuation and therefore do not distort current space vector.
The duration of ' known ' on off state in pulse width modulation cycle is depended on following factors:
The carrier frequency of pulse-width modulation,
The kind of pulse duration modulation method and mode.If the duration of ' known ' on off state is shorter, then cannot determine current space vector.
In this article, do not elaborate and how to implement pulse duration modulation method; The professional person is very clear, and this article shows that ' the unknown ' state is a problem.Talk about ' inverse (Zurueckrechnen) ' at first row, 40-44 in capable, but this is infeasible.This article shows to the professional person, according to Fig. 5 and 6 not only on half-bridge branch road and also below half-bridge, use the measuring unit of measuring unit, particularly zero potential in the branch road, such as Rogowski coil or this class component, the problem that can avoid ' the unknown ' state.Realize continuous current measurement signal by the appropriate combination of measuring-signal, particularly measuring-signal addition following and top measuring unit, and no longer include ' the unknown ' state issues.
The theory of US5 815 391, promptly branch road but also use measuring unit below half-bridge in the branch road on half-bridge not only can be used for above-mentioned IEEE article.Can in the shade scope, implement current measurement without a doubt and exactly by this way.Complicated measuring unit must be set certainly, particularly so be used to overcome potential barrier and the therefore big measuring unit of expense.This solution is very complicated and expensive.
Summary of the invention
Therefore of the present invention based on this purpose, further design a current transformer, in this current transformer, can abandon expensive components as much as possible, particularly under mass-produced situation, can realize producing cheaply and still can implementing to determine the method for current space vector.
Principal character of the present invention is aspect method, but in order to determine the current space vector of the current transformer that comprises signal circuit and power output stage that pulse-width modulation drives, this power output stage comprises and is arranged in three, contains power switch in the half-bridge of following and top branch road respectively
Wherein
-or below all three of half-bridge, arrange in the branch road above three in the branch road or in all of half-bridge and be used to detect the unit of electric current separately,
-in being time period of a pulse width modulation cycle, numerical value determines at least one attached current sampling value respectively with three two unit that are used for detecting the unit of electric current,
-before detecting the current sampling value that detects with first right unit and stipulate the first and second attached current sampling values with right Unit second, this unit afterwards,
-from this unit to forming a current space vector the current sampling value of determining or being formed on current value in the output branch road, be used in particular for the application in control and/or method of adjustment,
-depend on that average output voltage space vector differently selects this unit right,
-wherein determine the average output voltage space vector by output potential three output phases, that pulse width modulation cycle is averaged.
All the time only select two optimal values in three possible current measurement values in order to determine current space vector valuably for each pulse width modulation cycle.The present invention promptly comprises the information about current space vector especially based on this surprised understanding in the time flow of two optimal current measurement signals.Sometimes such on off state may occur to this even permission in this pulse width modulation cycle, this on off state itself does not allow to determine current space vector, just ' the unknown ' state on the meaning of US 5 815 391.
Because in such modification, its have below all three of half-bridge, arrange in the branch road, be used to detect the current unit of electric current separately, all the time do not use this phase place, relevant pulse width modulation signals is shorter than the minimum duration in low state in this phase place, guarantees to determine reliably current space vector under the situation of using suitable pulse duration modulation method, the particularly pulse duration modulation method of symmetry.To this power switch on hang down the power switch below connecting in the state separately and open.It in high state opposite situation.
The current sensor that can abandon using expensive components as much as possible, particularly current potential to separate in addition because be not in the output branch road but below half-bridge or above measure electric current in the branch road.Under mass-produced situation, can realize producing cheaply.
Especially side by side detect attached current sampling value and/or non-ly side by side implement attached measurement triggering in that pulse width modulation cycle is inner non-in the present invention with two unit of three unit that are used for detecting electric current.To this advantage be, in current transformer, can use microcontroller, that is to say the disposed outside sample-and-hold circuit that does not have at microcontroller with the not additional sample-and-hold circuit of an only unique analog-digital converter.
Especially with the every pulse width modulation cycle at least one unit in two unit more than once detecting the current sampling value and/or predesignating measurement triggering in pulse width modulation cycle inside more than one.
Especially with the every pulse width modulation cycle of first module in two unit just the measurement triggering of the Unit second in secondary detection current sampling value and two unit be in the centre of pulse width modulation cycle.The secondary measurement triggering of the first module of two unit advantageously with the centre of pulse width modulation cycle uniformly-spaced, that is to say from first measurement triggering of first module to the time period of first measurement triggering of Unit second equally to the time period of second measurement triggering of first module with measurement triggering from Unit second, the last-mentioned measurement triggering of Unit second is in the centre of pulse-width modulation.
Have below all three of half-bridge, arrange in the branch road, be used for detecting the modification of the unit of electric current separately, the center time point of pulse width modulation cycle shows the center time point of low state separately.Be present on the unit that detects electric current separately at current measurement signal during this state.
The current measurement value that belongs to the phase place of two said units is enough to determine current space vector.All the time can obtain whole three current measurement values of two unit in the present invention, because used useful pulse duration modulation method in the present invention, such as the pulse duration modulation method of symmetry, and the output voltage space vector is limited in hexagonal inside (Innkreis).This for example also shows do not have hexagonal angle vector to appear at whole pulse width modulation cycle enduringly.
For current space vector is not subjected to because the influence of the current fluctuation that causes of pulse-width modulation must realize measurement triggering in the suitable moment.For the measurement triggering of these two unit constantly is respectively simultaneously and centre that be in pulse width modulation cycle is favourable.Need two A/D converters or need outside sample-and-hold circuit, this is expensive.Implement the measurement triggering of two time migrations/stagger with first module according to the present invention.The measurement triggering of Unit second is in the centre of pulse width modulation cycle constantly.Two measurement triggering of first module have respectively to the identical time period of the centre of pulse width modulation cycle constantly.Therefore owing to average also because the symmetry of current fluctuation-because this current fluctuation of pulse duration modulation method of symmetry is symmetrical in centre-definite current measurement value under the situation of using first module of pulse width modulation cycle, it equals with first module at the detectable current measurement value in the centre of pulse width modulation cycle.
Determine current space vector for each pulse width modulation cycle especially.Useful to this is also can determine current space vector so that improve the quality of regulation of the control method of current transformer as far as possible continually under the situation of less pulse width modulation frequency.
Form current measurement signal on the intermediate circuit current potential below in a preferred embodiment, wherein from the current sampling value, determine to distribute to the current measurement value of half-bridge separately, from current measurement signal, derive this current sampling value.The control that particularly comprises current transformer is consistent with the reference potential that forms current measurement signal thereon with the reference potential of the signal circuit of conditioning equipment.Be to save the photoelectrical coupler (Optokoppler) that is used for the current potential separation to this advantage.The reference potential of signal circuit has following intermediate circuit current potential equally.To this major advantage be, can be created in the control signal of following power switch in the half-bridge by signal circuit, and high safe distance (Spannungsabstand) can not occur that it may need complicated current potential to separate (device).Just need to control the control signal of top power switch by photoelectrical coupler or other current potential separator.Especially do not have therefore can realize the major measure of saving cost and reducing component number in the current transformer of transducer such as the wiring of tachometer generator or unknown transducer or the wiring of current potential separator in addition at one.
Power semiconductor switch, such as the IGBT of npn type, can be advantageously used for the following power switch in the half-bridge, can control this power semiconductor switch with control voltage, this control voltage has following intermediate circuit current potential as reference voltage.
Intermediate circuit current potential on the power semiconductor switch that use to replenish is selected under such as the situation of the IGBT of pnp type also correspondingly designs current transformer as the reference potential of current measurement and signal circuit.
Depend on the angle of output voltage space vector in a preferred embodiment and do not depend on PWM mode differently select right.Be that the realization of programming technique is simple especially to this advantage.
Replace a pulse width modulation cycle to use the time period of two or more pulse width modulation cycles in another embodiment.To this advantage is also can determine current space vector under the situation of higher switching frequency.Though there be slight distorting in this, under the situation of higher switching frequency, be lower.
Preferred in pulse width modulation cycle, detect the current sampling value that just detects the unit detection of electric current with first current measuring unit medially in according to embodiments of the invention at one.Detect the first and second attached current sampling values with Unit second of two current measuring units symmetrically especially before detecting the current sampling value that detects with first current measuring unit and afterwards.To this advantage be, with only one do not have the analog-digital converter of outer samples holding circuit can determine current measurement value, it can be owing to the current fluctuation that pulse-width modulation causes is distorted.Just can especially simply and with less computational costs determine current measurement value.
Under the situation of using additional outer samples holding circuit, can detect attached current sampling value simultaneously and/or implement attached measurement triggering simultaneously with three two unit that are used for detecting the unit of electric current.In pulse width modulation cycle, implement measurement triggering especially medially.Be special determine current measurement value simply and still do not exist this advantage because distorting of causing of current fluctuation.
In another preferred embodiment of the present invention detection belong to second detect the current sampling value of current unit after at least one pulse width modulation cycle detect attached current sampling value with two first modules that are used for detecting the unit of electric current.Particularly belonging to two measurement triggering that detect the unit of electric current is in the different pulse width modulation cycles.To this advantage be, though when higher switching frequency only using a unique analog-digital converter and can not determining current space vector under the situation of additional sample-and-hold circuit, special not owing to distorting that current fluctuation causes.
Every in a preferred embodiment pulse width modulation cycle is more than once detecting the first right current sampling value, and forms a basis detect the value and/or the mean value of interpolation constantly separately from the value that has detected.Particularly detect before distributing to second current sampling second half-bridge, right and afterwards and distribute to first sampling value first half-bridge, right.Be that by interpolation or average and can determine a virtual current measurement value with higher accuracy, it exists simultaneously with the current sampling value that detects in addition to this advantage.
The current space vector of Jian Ceing is consistent with the mean value of current space vector in pulse width modulation cycle in a preferred embodiment.To this advantage be, because the current fluctuation that pulse-width modulation exists can not distorted the result and therefore do not distorted control method.
In the current transformer that comprises signal circuit and power output stage, this power output stage comprise be arranged in three contain respectively below and the power switch in the half-bridge of top branch road, wherein can drive this current transformer in pulse-width modulation ground, principal character of the present invention is:
-or below all three of half-bridge or in all branch roads above three of half-bridge, arrange and detect the unit of electric current separately,
-be supplied to and/or can supply with only unique analog-digital converter by three current measurement signals that detect the unit detection of electric current through a multiplexer.
Be to save expensive current potential separative element and reduce the structural volume of current transformer this advantage.
Current detecting unit comprises resistance, particularly shunt resistance in a preferred embodiment.To this advantage is that the cost of current detecting is extremely low.
Current detecting unit so is arranged in the half-bridge in a preferred embodiment, promptly itself or be connected with top intermediate circuit current potential or with following intermediate circuit current potential.To this advantage is to save the current potential separative element.Signal circuit has a reference potential in a further advantageous embodiment, and this current potential also is the reference potential of current detecting unit.If reference potential is U
Z-, then certainly save the current potential separative element be used for the control signal of power switch below the half-bridge.If reference potential is U
Z+, then certainly save the current potential separative element of the control signal that is used for power switch above the half-bridge.
Signal circuit has a reference potential in a preferred embodiment, and this current potential also is the reference potential of current detecting unit.Be to save expensive current potential separative element to this advantage.Because if current detecting unit is arranged in the feed line of motor, then essential expensive current potential separative element.
Can distribute to a unique analog-digital converter by means of a multiplexer and/or each current detecting unit of switch in a preferred embodiment.Be low-costly to realize current transformer by saving other analog-digital converter especially to this advantage.
Current detecting unit also can be assigned the analog-digital converter more than in principle.Be that the unit of selecting to be used to detect electric current under the situation of using the multiplexer of suitably arranging respectively is to for example distributing to two analog-digital converters and can saving additional sample-and-hold circuit to this advantage.Distribute an analog-digital converter respectively can for especially each current detecting unit.Be not need the sample-and-hold circuit that adds and can guarantee synchronous detecting current sampling value this advantage.Certainly preferably between each current detecting unit and the analog-digital converter that matches, arrange a sample-and-hold circuit respectively.To this advantage be, can be not because distorting of current fluctuation be determined current space vector and a unique analog-digital converter just enough.Can have a microcontroller and a sample-and-hold circuit that has unique analog-digital converter by the preferred signals circuit in addition, can't help microcontroller and comprise this sample-and-hold circuit, just the sample-and-hold circuit of additional external.To this advantage be, can use microcontroller cheaply, it only comprises a unique analog-digital converter.
Signal circuit comprises the unit that is used to power switch to produce the control signal of pulse-width modulation in a preferred embodiment, and signal circuit has a reference potential, and this current potential also is the reference potential of current detecting unit.To this advantage is to save the current potential separative element.
In a useful embodiment of the present invention, can distribute to a unique analog-digital converter by means of multiplexer and/or switch current detecting unit separately.Therefore certainly abandon the analog-digital converter of expensive other.
Principal character is in according to another useful embodiment of the inventive method,
-or below all three of half-bridge or in all branch roads above three of half-bridge, arrange and be used to detect the unit of electric current separately,
-in the time period that accounts for two pulse width modulation cycles, determine at least one attached current sampling value respectively with three two unit that are used for detecting the unit of electric current, and in two pulse width modulation cycles this average output voltage space vector of output,
-with the intermediate examination and measurement first current sampling value of right first module in the period 1 of two pulse width modulation cycles, with right Unit second second, the attached current sampling value of intermediate examination and measurement of the pulse width modulation cycle of just directly following,
-from this unit to forming a current space vector the current sampling value of determining, or in the output branch road, form current value, be used in particular for the application in control and/or control method,
-depend on that average output voltage space vector differently selects this unit right,
-wherein determine average output voltage space vector by output potential difference three output phases, that pulse width modulation cycle is averaged.
Be that the analog-digital converter next unique in the situation of higher pulse width modulation frequency just enough and not needs outside sample-and-hold circuit to this advantage.When being no more than the low-limit frequency of 10kHz for example, can switch to the method according to this invention of prior description.Therefore this advantage even be present in all pulse width modulation frequencies.
A low-limit frequency can be set, if select pulse width modulation frequency less than low-limit frequency, then implement at least one method,, then implement method according to second form of implementation of the present invention if select pulse width modulation frequency greater than low-limit frequency according to first form of implementation of the present invention.Advantageously, the value of above-mentioned low-limit frequency 8 and 16kHz between.From dependent claims, can also draw other useful expansion.
Description of drawings
Below by accompanying drawing concrete execution mode of the present invention is further detailed.Wherein,
Fig. 1 is the signal power output stage that drawn for 3-phase power converter;
The attainable modification of the part of the control of Fig. 1 and adjusting device has been shown among Fig. 2;
Fig. 3 is the another one execution mode different with Fig. 2;
Fig. 4 shows the output potential U at output voltage motor side current transformer, that each pulse width modulation cycle is averaged in cycle
R, U
SAnd U
TTime graph;
Among Fig. 5 for the output potential of Fig. 4 pulse-width signal PWM under the situation of output voltage angle [alpha]=π/6 that drawn once again
R(t), PWM
S(t) and PWM
T(t) attached time graph;
The current of electric I that belongs to the demonstration of two above-mentioned pulse width modulation cycles in the output branch road has been shown among Fig. 6
R(t), I
S(t) and I
T(t);
The current measurement signal I that belongs to two above-mentioned pulse width modulation cycles has been shown among Fig. 7
RM(t), I
SM(t) and I
TM(t) idealized time graph;
Fig. 8 shows the right selection according to form of implementation of the present invention;
Fig. 9 shows the angular region that depends on the output voltage space vector and implements measurement triggering.
Embodiment
Elaborate the present invention now with reference to the accompanying drawings:
In Fig. 1 for 3-phase power converter the signal power output stage that drawn.This is passed through six switch symbols S
RO, S
SO, S
TO, S
RU, S
SUAnd S
TUExpression has the power switch of the free wheeling diode of distribution.Shunt resistance R in the branch road below half-bridge
R, R
SAnd R
TArrange as current detecting unit.This resistance therefore with following reference potential U
Z-Connect, this current potential also is simultaneously the reference potential that comprises control and signal circuit adjusting device 1, current transformer.The output potential of the motor side of current transformer is U
R, U
SAnd U
TWith I
R, I
SAnd I
TThe expression current of electric.
Resistance and amplifier circuit V
R, V
SAnd V
TConnect, it produces current measurement signal I at outlet side respectively
RM, I
SMAnd I
TMFrom three current signals, derive the current sampling value by analog-digital converter, therefrom form current measurement value.From current measurement value, determine current space vector, wherein belong to the half-bridge of current measurement value according to the angle Selection of space vector of voltage.Because Kirchhoff law I
R+ I
S+ I
T=0 is applicable to current of electric, and this current space vector has two degrees of freedom.Just it has two independent parameter.Therefore the current measurement value of only distributing to two branch roads in principle is enough to be used in determining current space vector.But should note this, the pulse-width signal of current transformer needs not to be constant in pulse width modulation cycle inside, like this alteration switch state just sometimes even such on off state can occur promptly, itself definitely could not allow to determine separately current space vector!
Determine once that in order to reach the enough every pulse modulation of quality of regulation cycles a current space vector is just enough as amount of calculation for the method for adjustment of current transformer, mean value this space vector represents physical current space vector, that pulse width modulation cycle is got.
The pulse-width signal PWM that control and adjusting device 1 produce
R(t), PWM
S(t) and PWM
T(t) determine power switch S
RO, S
SO, S
TO, S
RU, S
SUAnd S
TUState.The following pulse-width signal of predesignating: if separately pulse-width signal, for example PWM
R(t), be 1, then connect attached top power switch, just S for example
RO, and open attached following power switch, S for example just
RUAttached in this case output voltage current potential is U
Z+If pulse-width signal is 0, just at low state, then attached power switch is in other state and attached output voltage current potential is U
Z-So-called dead time of inserting in reality realizes-open in this time is not very relevant with following switch-with principle function of the present invention above each.
Be in low state if belong to the pulse-width signal of a half-bridge, the accessory motor electric current flows through in the branch road below attached half-bridge and the shunt resistance separately of therefore flowing through.Flow through the minimum duration that time of shunt resistance is longer than the accessory motor electric current in order accurately to detect current measurement value.This minimum duration is depended on the filter effect of measuring amplifier circuit, and this measuring amplifier circuit comprises amplifier circuit V
R, V
SAnd V
TArrange the realization filter effect by corresponding circuit, so that be suppressed at noise section or interference sections in the current measurement value.For example the filtering time constant of 0.5 μ s to 2 μ s scope is useful under the situation of the pulse width modulation frequency of 16kHz.
Use so-called symmetrical pulse duration modulation method in the present invention valuably.In so symmetrical pulse duration modulation method, the same value of mean value with the corresponding formation of two other phase place is arranged from the first on off state conversion of pulse-width signal first phase place value and the temporal mean value that forms of the time follows in this phase place on off state conversion value constantly constantly.Therefore on off state conversion from high to low is with inverse transformation centre with respect to pulse width modulation cycle in all three phase places is symmetrical mutually.
The amplitude of average in the present invention output voltage space vector is restricted to
, so can produce a sine-shaped three-phase voltage system all the time.This restriction maximum adjustment of expression in the present invention.All the time avoided adjustment, just broke away from working range by this restriction definition.
The present invention only relates to this current transformer, and this is not promptly carried out so high adjustment by pulse-width modulation ground driving like this in any one pulse width modulation cycle, only make unique effective on off state to occur for whole pulsewidth adjustment cycle.Pulse-width signal PWM in so effective on off state
R(t), PWM
S(t) and PWM
T(t) adopted value (110), (101), (100), (001), (010) or (011), this value is also referred to as discrete effective output voltage space vector.Effectively on off state does not comprise on off state (111) and (000).Two last-mentioned on off states are also referred to as discrete no-voltage space vector or zero vector respectively.
So-called edge vectors is the output voltage space vector that pulse width modulation cycle is averaged, and applies in theory under the situation of a unique effective on off state and draw this average output voltage space vector on whole pulse width modulation cycle.The output voltage space vector that pulse width modulation cycle is averaged never adopts the value of edge vectors like this owing to the restriction of working range above-mentioned in the present invention.
In the figure of the above-mentioned IEEE article of Francesco Parasiliti, according to the Fig. 8 on 1287 pages, the above-mentioned restriction of the output voltage space vector that pulse width modulation cycle is averaged shows that this vector is in hexagonal maximum internal.Average output voltage space vector does not adopt the value of edge vectors, and just this vector is not on hexagonal angle in the present invention.
Because so restriction output voltage space vector is different discrete switch state checkers.By in pulse width modulation cycle, selecting measurement triggering constantly suitably, can determine a current space vector for each pulse width modulation cycle.The state of checker in addition even comprise such state, in this state, if pulse width modulation cycle of this state continuance such as the state (101) according to the last row of the table 2B of US5 815 391, then can not be determined current space vector.Particularly for example first moment in first phase place is implemented measurement triggering, and another second moment in second phase place implements second measurement triggering and implements the 3rd measurement triggering constantly in the 3rd of first phase place.The realization of averaging by the first and the 3rd measured value, can be in the pulse duration modulation method of the pulse duration modulation method that allows for the present invention, particularly symmetry owing to confirmable current space vector is not distorted in current fluctuation, the output voltage space vector is limited in hexagonal inside in this pulse duration modulation method.Therefore only need a unique analog-digital converter, particularly do not have outside additional sample-and-hold circuit.
Figure 2 illustrates the attainable modification of the part of the control of Fig. 1 and adjusting device.It comprises 21, three current measurement signals of a sample-and-hold circuit and distributes to this sample-and-hold circuit, and comprises a microcontroller 22 with integrated analog-digital converter.Microcontroller 22 is by signal S/H1, S/H2 and the S/H3 control sampling moment, and this sampling is also referred to as measurement triggering constantly, and sample-and-hold circuit 21 holding current measuring-signals are constant up to analog-to-digital conversion constantly at this.Microcontroller 22 must only comprise a unique analog-digital converter with analog multiplexer or change over switch 23.To this advantage is to detect when only a unique analog-digital converter is realized the current sampling value, although carry out along continuous analog-to-digital conversion.In microcontroller 22, from the current sampling value, determine current measurement value or current space vector.Therefore microcontroller 22 also triggers according to the method control survey of narrating below by signal S/H1, S/H2 and S/H3 control sample-and-hold circuit.
One other according to embodiments of the invention in, different with modification according to Fig. 2, can save sample-and-hold circuit 21 according to Fig. 3.Must be according to the method continuous detecting current sampling value of narrating below to this.
In Fig. 4, for example show output potential U at output voltage motor side current transformer, that each pulse width modulation cycle is averaged in cycle
R, U
SAnd U
TTime graph, the scope that the output potential of motor side and output potential angle α continue 0 to 2 π has been drawn in wherein standardization (demarcation).Demarcate potential value U according to this
Z-Be equivalent to value-1, U
Z+Be equivalent to value+1.
As can be seen, the mean value of output potential comprises a triple-frequency harmonics in Fig. 4.
In Fig. 4, drawn the angular region 1 to 6 of output voltage vector in addition, in this scope, used different current detecting means/devices according to the inventive method.
Output potential U under the situation at the output voltage angle of α=π/6
SMean value be zero.Output potential U
RMean value be near the positive maximum 1.Output potential U
TMean value near minimum value-1.The mean value of output potential is under the situation at this output voltage angle and almost reach the maximal regulated of current transformer under the situation of the amplitude of for example selecting.
In Fig. 5 for the output potential of Fig. 4 pulse-width signal PWM under the situation of output voltage angle [alpha]=π/6 that drawn once again
R(t), PWM
S(t) and PWM
T(t) attached time graph.From these signals, derive power switch S
RO, S
SO, S
TO, S
RU, S
SUAnd S
TUControl signal.If pulse-width signal separately, for example PWM
R(t), be 1, then connect attached top power switch, just S
RO, and open attached following power switch, just S
RUAttached in this case output voltage current potential U
R=U
Z+If pulse-width signal is 0, attached power switch enters other state, and attached output voltage current potential is U
Z-The dead time (Totzeit) of in reality realizes, inserting-this time durations open above each and below switch-for functional principle of the present invention on be inessential.In Fig. 5, on the abscissa direction, show two pulse width modulation cycles.
Pass through signal PWM according to Fig. 5
S(t) realize the output voltage current potential U of pulsewidth to being averaged modulation period
S=0, the pulse width modulation cycle of this signal 50% is that 1,50% pulse width modulation cycle is 0.The output voltage current potential that pulse width modulation cycle is averaged according to pulse-width signal distributes other pulse-width signal PWM
R(t) and PWM
T(t) pulse-width modulation ratio.
Figure 6 illustrates the current of electric I that in the output branch road, belongs to the demonstration of two above-mentioned pulse width modulation cycles
R(t), I
S(t) and I
T(t).Show in addition because the current ripples degree that the output potential of pulse-width modulation produces.
Figure 7 illustrates the current measurement signal I that belongs to two above-mentioned pulse width modulation cycles
RM(t), I
SM(t) and I
TM(t) idealized time graph does not have amplifier circuit V
R, V
SAnd V
TFilter action.Only draw in this time period and be not 0 current sampling value, promptly the pulse-width signal of attached half-bridge is zero in this time period; That is to say the switch below connecting.If the switch above connecting, the current of electric shunt resistance of half-bridge of not flowing through then, so irrelevant at this time durations current measurement signal and actual current is zero.The discontinuous representative current of electric of current measurement signal but the representative only electric current in this time period, i.e. pulse-width signal PWM in this time period
R(t), PWM
S(t) and PWM
T(t) be zero.Current measurement signal I in a very short time period only in the curve that illustrates
RM(t) non-vanishing.This time period even complete obiteration under the situation of the adjusting fully (Vollaussteurung) of output voltage.Therefore as can be seen from Figure 7, if form current space vector under the situation of using current measurement signal, this signal is only so non-vanishing in short time-such as the I of demonstration in the drawings
RM(t), make, then uncertain current space vector under operating state so because filter action is detecting constantly, significantly distorting during just in measurement triggering this signal.Minimum filter action is essential, so that suppress to measure noise and interference noise.
Therefore use such " the best " right for each pulse width modulation cycle in the present invention, it has the pulse-width signal of broad respectively, therefrom selects three half-bridges, that is to say the current measurement signal that only uses two special half-bridges.So select, promptly do not use such current measurement signal, the switch below it in pulse width modulation cycle separately, have than two other below the short time of switch be on-state.
Figure 7 illustrates the operating state of two pulse width modulation cycles, in this state, select to being I
SM(t) and I
TM(t).Show this constantly for these current signals by jagged arrow, detect the current sampling value constantly and this is also referred to as measurement triggering constantly at this.
Can use two basic skills according to the present invention to this.
Drawn measurement triggering for first method with the sawtooth arrow that solid line, non-dotted line draw.To this select to I
SM(t) and I
TM(t) detect the current sampling value under the situation simultaneously.Can predesignate different forms of implementation to this.In first form of implementation, form each current sampling value by an independent analog-digital converter.Supply with the sampling hold amplifier of sample-and-hold circuit 21 in second form of implementation respectively according to three current measurement signals of Fig. 2, the hold amplifier of wherein taking a sample is transformed to hold mode constantly in sampling.Therefore analog-digital converter can be changed the current measurement signal that remains unchanged in proper order by means of multiplexer or change over switch.In the 3rd form of implementation, use two analog-digital converters and corresponding change over switch.In other form of implementation, also can implement mixed form.
Use the pulse duration modulation method of a symmetry in first method valuably, wherein switching frequency is chosen as and is not higher than 20kHz, and is no more than above-described maximal regulated.Therefore have a pulse mode all the time in pulse width modulation cycle, so pulse-width signal occurs in maximum output branch roads in this pattern, the time that its low state exists is shorter than the minimum duration.That is to say never and in two phase places, be in low state simultaneously for two pulse-width signals that are lower than the minimum duration.For one of pulse-width signal PWM for example
R(t) low state does not surpass the situation of minimum duration, then still ensures the correct current space vector of determining.Because two other pulse-width signals-PWM just in this example
S(t) and PWM
T(t)-be not less than the minimum duration.Therefore guarantee the correct current space vector of determining in the present invention all the time, need only and in various forms of pulse duration modulation methods, guarantee that the time that only maximum all the time pulse-width signals stop is shorter than the minimum duration in low state.
In second the method according to this invention, replace first I according to the inventive method with two measurement triggering
TM, be in the measurement triggering in the middle of the pulse width modulation cycle, these two measurement triggering have a time deviation Δ t.This is at first realized in order I
TMFirst measurement triggering, realize I then
SMMeasurement triggering and realize I afterwards
TMSecond measurement triggering.Useful to this is to make I
SMMeasurement triggering be in the centre of pulse width modulation cycle.T is as far as possible little for the time deviation Δ, should be greater than the analog-digital converter time.From I
TMThe first and second current sampling values in form mean value and be used for determining current space vector.So the mean value that forms is equivalent to I
TMThis virtual current sampling value, promptly with current sampling value I
SMDetection detectable current sampling value simultaneously.Therefore the current space vector of determining by this way is not subjected to the influence of current fluctuation.Because under the situation of the pulse duration modulation method that uses symmetry during as t=0.5 current fluctuation also have at the centre of pulse width modulation cycle and the point-symmetric curve of current function value separately, find out such as in Fig. 6, demonstrating.The centre of first pulse width modulation cycle is in t=0.5 in Fig. 6, and the centre of second pulse width modulation cycle is in t=1.5.Because two current sampling value I
TM(t=0.5-Δ t) and I
TM(t=0.5+ Δ t) point symmetry is in current function value I
TM(t=0.5), two current sampling value I
TM(t=0.5-Δ t) and I
TMThe mean value of (t=0.5+ Δ t) equals current function value I
TM(t=0.5).
Can determine current space vector with unique analog-digital converter only by this way, not owing to current fluctuation is distorted.Because can implement current sampling continuously, can also not use additional sample-and-hold circuit.Additional sample-and-hold circuit be should not be construed as such sample-and-hold circuit as the fixedly part in the analog-digital converter commonly used.
Use the pulse duration modulation method of a symmetry in second method valuably, wherein switching frequency selects not to be higher than 20kHz valuably, and is no more than above-described maximal regulated.Therefore have a pulse mode once again all the time in a pulse width modulation cycle, so pulse-width signal occurs in maximum output branch roads in this pattern, the time that its low state exists is shorter than the minimum duration.In this pulse duration modulation method that in second the method according to this invention, uses, have at least one pulse-width signal all the time, the time that its low state exists be longer than the 2* Δ t-of minimum duration and DT Doubling Time deviation-just with.Therefore guarantee the correct current space vector of determining in the present invention all the time, need only and in the form separately of pulse duration modulation method, guarantee that pulse-width signal has enough pulsewidths.Though the Flat-Top method is the pulse duration modulation method of symmetry, generally is not applied in valuably under the situation of less output voltage.
Only use so pulse duration modulation method in the present invention, its centre at pulse width modulation cycle so has an on off state, the switch below promptly connecting at least two.
Other be not in same pulse width modulation cycle, to determine the current sampling value in according to embodiments of the invention, but in first pulse width modulation cycle, detect the first current sampling value and in ensuing pulse width modulation cycle, detect the second current sampling value.To this unique analog-digital converter can only be set once again, and not have additional sample-and-hold circuit.This is useful especially under the situation of higher switching frequency, and therefore short pulse width modulation cycle is arranged.This is not appearred distorting owing to current fluctuation.Only this time memory, the angle of current space vector changes and may cause and distort.This is realized right selection according to Fig. 8.
Drawn angular region 1 to 6 in Fig. 4, it is corresponding to the different angular regions of output voltage vector.It is to be used right to have provided by the sawtooth arrow for each angular region in Fig. 8.For example in angular region 1, only use S and T, just I
SMAnd I
TMIn angular region 2, only use R and T, just I
RMAnd I
TM
As above-described, in second the method according to this invention, replace first measurement triggering current sampling value, that symmetry exists in the middle of pulse width modulation cycle according to the inventive method with two measurement triggering that have a time deviation Δ t respectively.Fig. 9 illustrates, and depends on that the angular region of output voltage space vector is implemented measurement triggering.Described especially and in which half-bridge, implemented two measurement triggering and in which half-bridge, implement measurement triggering independent, that mediate.In angular region 1, realize I
TMFirst measurement triggering, realize I then
SMMeasurement triggering independent, that mediate and realize I at last
TMSecond measurement triggering.The time period that this measurement triggering is had Δ t.
In angular region 3, realize I
RMFirst measurement triggering, realize I then
TMMeasurement triggering independent, that mediate and realize I at last
RMSecond measurement triggering.
There is phase place with lightning shape that solid line draws for each angular region, this shows the current sampling that mediates in this phase place, and have another phase place with lightning shape that two dotted lines draw, this shows in this phase place double-current sampling and these two current samplings time deviation Δ t before the centre and afterwards.Only use so pulse duration modulation method in the present invention, its pulse mode so is provided all the time, promptly near the time range the current sampling separately, turn on switch below in the angular region separately of the phase place of lightning shape characterization.In phase place with lightning shape that two dotted lines draw from after second measurement triggering, connect before first measurement triggering attached below switch.
The feature of spendable pulse duration modulation method is, at least in the middle of pulse width modulation cycle, constantly connect the switch below two all the time, wherein such switch of matching of the phase place in these two following switches even connect time periods 2 Δ t at least with having the double-current sampling.
Another according to embodiments of the invention in according to Fig. 7 about being used to detect current measurement signal I
SMThe measurement triggering of current sampling value asymmetricly detect current measurement signal I
TMTwo current sampling values, be not to detect I
SMBefore and time period Δ t afterwards, but detect with the different time periods.Replace mean value to form an interpolate value (interpolierter Wert) then, it considers the corresponding time period, wherein considers the form and the duration that characterize the amount of motor and also take on off state when inserting into account certainly.
Detect a plurality of current sampling values in another two current sampling values that replace mentioning in according to embodiments of the invention.Available in principle in addition a plurality of current sampling values replace each current sampling value.Therefore can further reduce the measurement noise.
Other according to embodiments of the invention in, by making the filtering time constant of all measurement triggering delay amplifier circuit, consider amplifier circuit V
R, V
SAnd V
TTime response.To this filtering time constant half less than minimum duration.
This method also works under the situation of the pulse width modulation frequency that is higher than 20kHz.
The reference symbol table
1 control and adjusting device
21 sample-and-hold circuits
22 microcontrollers
23 multiplexers
Claims (20)
1. but determine the method for the current space vector of the current transformer that pulse-width modulation ground drives, this current transformer comprises signal circuit and a power output stage, this power output stage comprises and is arranged in three power switchs in the half-bridge, and described half-bridge comprises a following branch road and a top branch road respectively, wherein
-respectively in the branch road below all three of half-bridge or in all branch roads above three of half-bridge, arrange respectively as being used to detect the shunt resistance and the amplifier circuit of the unit of electric current separately, described resistance is connected with an amplifier circuit respectively, described amplifier circuit produces current measurement signal at its outlet side respectively, from current measurement signal, derive the current sampling value by D-A converter
-in the time period that accounts for a pulse width modulation cycle, determine the current sampling value that at least one is attached by D-A converter respectively with three two unit that are used for detecting the unit of electric current,
-before detecting the current sampling value that detects with right first module and stipulate the first and second attached current sampling values with right Unit one second afterwards,
-to form a current space vector or in the output branch road, to form current value this current sampling value that unit is determined, be used in particular for the application in control and/or control method,
-differently selected cell is right according to average output voltage space vector,
-and wherein determine average output voltage space vector by output potential difference three output phases, that pulse width modulation cycle is averaged.
2. according to the method for claim 1, it is characterized in that, differently select this right according to the angle of output voltage space vector.
3. according to the method for claim 1, it is characterized in that, use with unit following or that be connected with top intermediate circuit current potential and determine the current sampling value.
4. according to the method for claim 1, it is characterized in that the reference potential of signal circuit exists the reference potential of current measurement signal and/or detection current sampling value corresponding with one thereon.
5. according to the method for claim 1, it is characterized in that, carry out the detection of current sampling value in the centre of such state of pulse width modulation cycle, in this state with the same branch road of attached current measuring unit in the power switch conducting of arranging.
6. according to the method for claim 1, it is characterized in that, carry out the detection of current sampling value with skew filtering time constant in the middle of such state of pulse width modulation cycle, in this state with the same branch road of attached current measuring unit in the power switch conducting of arranging.
7. according to the method for claim 1, it is characterized in that, this right Unit second is such unit, promptly when these current measuring units are arranged in the branch road below three, continuing the longest conducting state in the pulse width modulation cycle separately in the power switch below in this unit, occurring three, and this right first module is such unit, and the power switch occur three in this unit below is continuing the second long conducting state in the pulse width modulation cycle separately.
8. according to the method for claim 1, it is characterized in that, this right Unit second is such unit, promptly when these current measuring units are arranged in the branch road above three, continuing the longest conducting state in the pulse width modulation cycle separately in the power switch above in this unit, occurring three, and this right first module is such unit, and the power switch occur three in this unit above is continuing the second long conducting state in the pulse width modulation cycle separately.
9. according to the method for claim 1, it is characterized in that the measurement triggering that is used in a pulse width modulation cycle detecting the current sampling value that belongs to a unit has the identical time period in the middle of the pulse width modulation cycle respectively.
10. according to the method for claim 1, it is characterized in that, with two every pulse width modulation cycles in unit more than once detect the current sampling value and/or in a pulse width modulation cycle regulation more than one measurement triggering.
11. the method according to claim 1 is characterized in that, forms basis and detect the value of moment interpolation and/or the current measurement value that current space vector is determined in the mean value conduct separately from the current sampling value of detection.
12. the method according to claim 1 is characterized in that, stipulates the first and second current sampling values of Unit second that this is right when detecting detected current sampling value, replaces the first and second current sampling values with a unique sampling especially.
13. the method according to claim 1 is characterized in that, stipulates a low-limit frequency, selects pulse width modulation frequency less than this low-limit frequency.
14. be used for implementing the current transformer of each described method of aforesaid right requirement, comprise a signal circuit and a power output stage, this power output stage comprises and is arranged in three, comprises below one respectively and the power switch in the half-bridge of top branch road,
Wherein can drive this current transformer in pulse-width modulation ground,
It is characterized in that,
-or the branch road below all three of half-bridge in or arrange in the branch road above three in all of half-bridge and to be used to detect the unit of electric current separately,
-the current measurement signal that detected by three unit that are used to detect electric current is fed into and/or can supplies to only unique analog-digital converter through a multiplexer.
15. the current transformer according to claim 14 is characterized in that, the unit that is used to detect electric current comprises resistance, particularly shunt resistance, and/or
The unit that is used for detecting electric current so is arranged in half-bridge, promptly itself or with top or be connected with following intermediate circuit current potential.
16. the current transformer according to claim 14 is characterized in that, signal circuit comprises the unit that is used to power switch to produce the control signal of pulse-width modulation.
17. the current transformer according to claim 14 is characterized in that, signal circuit has a reference potential, and this current potential also is the reference potential that is used for the unit of current detecting.
18. but determine the method for the current space vector of the current transformer that pulse-width modulation ground drives, this current transformer comprises signal circuit and a power output stage, this power output stage comprises and is arranged in three power switchs in the half-bridge, and described half-bridge comprises a following branch road and a top branch road respectively, wherein
-respectively in the branch road below all three of half-bridge or in all branch roads above three of half-bridge, arrange respectively as being used to detect the shunt resistance and the amplifier circuit of the unit of electric current separately, described resistance is connected with an amplifier circuit respectively, described amplifier circuit produces current measurement signal at its outlet side respectively, from current measurement signal, derive the current sampling value by D-A converter
-determine the current sampling value that at least one is attached by D-A converter respectively accounting in the time period of two pulse width modulation cycles with three two unit that are used for detecting the unit of electric current, and this average output voltage space vector of output in two pulse width modulation cycles
-with the intermediate examination and measurement first current sampling value of first right unit in first cycle of two pulse width modulation cycles, and with this right Unit second second, the attached current sampling value of intermediate examination and measurement of the pulse width modulation cycle of just directly following,
-to form a current space vector or in the output branch road, to form current value this current sampling value that unit is determined, be used in particular for the application in control and/or control method,
-differently selected cell is right to depend on average output voltage space vector,
And wherein determine average output voltage space vector by output potential difference three output phases, that pulse width modulation cycle is averaged.
19. the method according to claim 18 is characterized in that, sets a low-limit frequency, selects pulse width modulation frequency greater than low-limit frequency.
20. the method according to claim 13 or 19 is characterized in that, the value of described low-limit frequency 8 and 16kHz between.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10154478.2 | 2001-11-08 | ||
| DE10154478 | 2001-11-08 | ||
| PCT/EP2002/011172 WO2003041256A2 (en) | 2001-11-08 | 2002-10-04 | Converter and method for determination of a current sinor |
| DEPCT/EP02/11172 | 2002-10-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1575539A CN1575539A (en) | 2005-02-02 |
| CN100361381C true CN100361381C (en) | 2008-01-09 |
Family
ID=7704796
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB028209427A Expired - Lifetime CN100361381C (en) | 2001-11-08 | 2002-10-18 | Converter and method for determining a current space vector |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN100361381C (en) |
| DE (1) | DE10248375C2 (en) |
| WO (2) | WO2003041256A2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3674578B2 (en) * | 2001-11-29 | 2005-07-20 | 株式会社デンソー | Current detector for three-phase inverter |
| DE102005012752A1 (en) * | 2005-03-19 | 2006-09-21 | Continental Aktiengesellschaft | Method for digital current regulation |
| GB2426393B (en) * | 2005-05-20 | 2008-10-22 | Siemens Ag | An AC motor drive current measurement system |
| DE102006006960B4 (en) * | 2006-02-14 | 2021-02-18 | Sew-Eurodrive Gmbh & Co Kg | Procedure and electrical device |
| DE102007001389A1 (en) * | 2007-01-09 | 2008-07-17 | Siemens Ag | Method and apparatus for pulse width modulation |
| US7916508B2 (en) * | 2007-12-05 | 2011-03-29 | General Electric Company | Systems and methods involving thyristors |
| DE102008011164B4 (en) * | 2008-02-26 | 2012-10-04 | Panasonic Industrial Devices Europe Gmbh | Method and apparatus for dynamically compensating the zero offset in the winding current sense for the control of a brushless motor |
| DE102008017642A1 (en) * | 2008-04-04 | 2009-12-10 | Sew-Eurodrive Gmbh & Co. Kg | Inverter and method for determining a current space pointer |
| DE102008018075B4 (en) * | 2008-04-09 | 2010-12-23 | Sew-Eurodrive Gmbh & Co. Kg | Inverter and method for determining a current space pointer |
| DE102008018885A1 (en) * | 2008-04-14 | 2009-10-22 | Sew-Eurodrive Gmbh & Co. Kg | Printed circuit board, method for determining a current space indicator, inverter, circuit board and series of converters |
| CN101615860B (en) * | 2009-07-23 | 2011-02-09 | 东南大学 | Modulation method applied to cascade converter |
| CN103167665B (en) | 2011-12-08 | 2014-10-08 | 昂宝电子（上海）有限公司 | System and method for adjusting current of luminous diode |
| CN103781257B (en) * | 2011-12-08 | 2018-03-20 | 昂宝电子（上海）有限公司 | System and method for adjusting LED current |
| DE102019100638B4 (en) * | 2019-01-11 | 2024-04-25 | Tdk-Micronas Gmbh | Current measuring system for a commutated motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772996A (en) * | 1986-04-11 | 1988-09-20 | Hitachi, Ltd. | Load current detecting device for pulse width modulation inverter |
| CN1164939A (en) * | 1995-06-23 | 1997-11-12 | 株式会社安川电机 | Bridge power converter |
| US5815391A (en) * | 1996-03-19 | 1998-09-29 | International Rectifier Corporation | Current sensing circuit for pulse width modulated motor drive |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2753318B1 (en) * | 1996-09-09 | 1998-10-30 | Schneider Electric Sa | DEVICE FOR MEASURING CURRENTS IN AN INVERTER |
| CA2288581A1 (en) * | 1999-11-05 | 2001-05-05 | Hui Li | Three-phase current sensor and estimator |
-
2002
- 2002-10-04 WO PCT/EP2002/011172 patent/WO2003041256A2/en not_active Application Discontinuation
- 2002-10-17 DE DE10248375A patent/DE10248375C2/en not_active Expired - Lifetime
- 2002-10-18 CN CNB028209427A patent/CN100361381C/en not_active Expired - Lifetime
- 2002-10-18 WO PCT/EP2002/011685 patent/WO2003041258A2/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772996A (en) * | 1986-04-11 | 1988-09-20 | Hitachi, Ltd. | Load current detecting device for pulse width modulation inverter |
| CN1164939A (en) * | 1995-06-23 | 1997-11-12 | 株式会社安川电机 | Bridge power converter |
| US5815391A (en) * | 1996-03-19 | 1998-09-29 | International Rectifier Corporation | Current sensing circuit for pulse width modulated motor drive |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003041256A3 (en) | 2003-09-25 |
| WO2003041256A2 (en) | 2003-05-15 |
| DE10248375C2 (en) | 2003-09-18 |
| WO2003041258A3 (en) | 2003-09-25 |
| WO2003041258A2 (en) | 2003-05-15 |
| CN1575539A (en) | 2005-02-02 |
| DE10248375A1 (en) | 2003-05-28 |
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