CN1445918A - Conversion device and its idle time compensation method - Google Patents
Conversion device and its idle time compensation method Download PDFInfo
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Abstract
The objective of this invention is to set an appropriate amount of dead time compensation to prevent erroneous compensation. A control unit 17 compares a current value detected by U- and V-phase current detectors 13 and 14 with a preset threshold. When the current value becomes a set threshold or less based on the switching speed of transistors Q1 to Q6, the control unit 17 reduces the amount of dead time compensation based on the detected current value. When the current value becomes a set threshold or less based on the detection accuracy of an output current, the control unit 17 increases a reduction rate in the amount of dead time compensation. Additionally, when the detected current value becomes so small to the extent that whether it is positive or negative cannot be discriminated, the amount of dead time compensation is set to 0.
Description
Technical field
The present invention relates to converting means and idle time compensating method thereof.
Background technology
Converting means is the device of direct-current coupling voltage transformation for exchanging that will apply.Converting means is used as the driving of induction motor especially.
The structure of the frequency converter of existing voltage-type (VVVF) as shown in Figure 5.
The voltage transformation parts 51 of converting means have switch S 1～S4.Switch S 1～S4 carries out switching according to voltage command signal.For the direct-current coupling voltage transformation that will apply is an alternating voltage, converting means is cut-off switch S2, S3 at first, connects S1, S4, and time cut-off switch S1, S4 below connects S2, S3 then.So generate alternating voltage.On load 52, flow through alternating current as shown in Figure 6.
In order to prevent perhaps to be short-circuited on the current circuit of switch S 3 and S4, as shown in Figure 7, Td idle time is set in voltage command signal at switch S 1 and S2.
In order under any condition, to guarantee this idle time, just be necessary to carry out the compensation of idle time.
Idle time, compensation had following compensation method: detect the output voltage of converting means, according to the method for detected output voltage to compensating idle time of voltage command signal; Detect the output current of converting means, according to the symbol of this output current method to compensating idle time of voltage command signal.Disclosed this output current that detects converting means in the Japanese kokai publication hei 6-62579 communique, according to the symbol of this output current converting means to compensating idle time of voltage command signal.
More above-mentioned two methods must newly be provided with voltage detector in the former method.And, can utilize the current detector that is arranged in the frequency converter according to the latter's method.Therefore, consider cost and the factor that takes up room, preferably use the latter's method.
But in the latter's time slot compensation method, in a single day output current diminishes and just is difficult to judge that it is positive and negative.So, might carry out wrong compensation.In case carried out wrong compensation, though when the output frequency of converting means is 50Hz, even carried out wrong compensation, voltage reduces also less, and special is under the situation of the pulse narrowing about 1～5Hz in frequency, and current waveform can produce distortion.This also can become the reason that voltage reduces.
Summary of the invention
The present invention is exactly in view of problems of the prior art, can prevent that the converting means and the idle time compensating method thereof of wrong compensation from being purpose by simple method to provide a kind of.
In order to reach this purpose, the invention provides a kind of converting means, its structure has the switch element that applies direct voltage that is connected in series, it is characterized in that comprising: according to control signal switching separately, and is the voltage transformation parts of alternating voltage with above-mentioned dc voltage conversion by above-mentioned each switch element; Current value according to the output current of above-mentioned voltage transformation parts, setting is in order to prevent to connect simultaneously owing to the above-mentioned switch element that is connected in series compensation rate idle time of the compensation idle time that is provided with of being short-circuited, and the above-mentioned control signal that will compensate idle time offers the control assembly of above-mentioned voltage transformation parts.
In addition, above-mentioned control assembly can surpass under the situation of the 1st threshold value at the current value of above-mentioned output current be provided with fixing above-mentioned time slot compensation rate, and under the situation of current value smaller or equal to the 1st threshold value of this output current, according to the current value of this output current above-mentioned idle time of compensation rate is set.At this moment, above-mentioned control assembly can be under the situation of current value smaller or equal to above-mentioned the 1st threshold value of above-mentioned output current, in case the current value step-down of this output current just is provided with above-mentioned idle time of the compensation rate of reduction.In addition, above-mentioned control assembly can be at the current value of above-mentioned output current below above-mentioned the 1st threshold value and under than the high situation of the 2nd threshold value that is lower than the 1st threshold value, in case the current value step-down of this output current just is provided with compensation rate idle time that reduced rate with regulation has reduced, and under the situation of current value smaller or equal to the 2nd threshold value of this output current, just strengthen this reduced rate.Also have, above-mentioned control assembly can be at the current value of above-mentioned output current smaller or equal to than also low the 3rd threshold value of the 2nd threshold value the time, and it is 0 that above-mentioned idle time compensation rate is set, and does not carry out the compensation of above-mentioned idle time.
In addition, in converting means of the present invention, above-mentioned control assembly can have: compare according to the switching speed of above-mentioned switch element current value and predefined the 1st threshold value with the output current of above-mentioned voltage transformation parts, whether the current value of judging this output current judgment means below the 1st threshold value; The current value of judging above-mentioned output current in above-mentioned judgment means under the situation below above-mentioned the 1st threshold value, in case the current value step-down of above-mentioned output current just be provided with reduction above-mentioned idle time compensation rate compensation rate reduce device.
In this case, above-mentioned judgment means can be when whether the current value of judging above-mentioned output current be below above-mentioned the 1st threshold value, with the current value of above-mentioned output current with compare corresponding to the 2nd threshold value accuracy of detection setting, that be lower than the 1st threshold value with this current value, whether the current value of judging above-mentioned output current below the 2nd threshold value.Above-mentioned compensation rate reduces current value that device also can judge above-mentioned output current in above-mentioned judgment means under the situation below above-mentioned the 2nd threshold value, strengthens the current value of this output current with above-mentioned reduced rate.In addition, whether the current value that above-mentioned judgment means can also be judged above-mentioned output current is below than the 3rd also low threshold value of above-mentioned the 2nd threshold value, above-mentioned compensation reduce device judges above-mentioned output current in above-mentioned judgment means current value below above-mentioned the 3rd threshold value in, it is 0 that above-mentioned idle time compensation rate is set, and does not carry out the compensation of above-mentioned idle time.
For achieving the above object, the invention provides a kind of idle time compensating method of converting means, this converting means has the switch element that applies direct voltage that is connected in series, it is characterized in that comprising the following steps: having by above-mentioned switch element according to the control signal switching, be in the converting means of voltage transformation parts of alternating voltage with above-mentioned dc voltage conversion, according to the current value of the output current of above-mentioned voltage transformation parts, be set to prevent that the switch element that is connected in series owing to above-mentioned from connecting the idle time that is short-circuited and is provided with simultaneously; The above-mentioned control signal that has compensated idle time is offered above-mentioned voltage transformation parts.
Description of drawings
Fig. 1 is the block diagram of structure of the converting means of expression first embodiment of the present invention.
Fig. 2 is the flow chart that the vector control of the control assembly of presentation graphs 1 is moved.
Fig. 3 is the key diagram of expression converting means action.
Fig. 4 is the flow chart that compensates the idle time of the control assembly of presentation graphs 1.
Fig. 5 is the key diagram of the principle of the existing converting means of expression.
Fig. 6 is the movement oscillogram of the converting means of Fig. 5.
Fig. 7 is the waveform enlarged drawing of Fig. 6.
Embodiment
Below, the converting means of embodiments of the invention is described with reference to accompanying drawing.
What Fig. 1 represented is the structure of the converting means of present embodiment.
The converting means of present embodiment is that output voltage is the voltage source converter of rectangular wave, and its structure has: direct current smmothing capacitor 11, voltage transformation parts 12, U phase current detector 13, V phase current detector 14, rotor position detector 15, direct-current coupling voltage detector 16 and control assembly 17.
Direct current smmothing capacitor 11 is to be used for the parts of direct voltage of smooth direct current power supply.
The voltage instruction value that voltage transformation parts 12 provide according to control assembly 17 will by direct current smmothing capacitor 11 level and smooth the direct-current coupling voltage transformation be direct voltage.Voltage transformation parts 12 have transistor Q1～Q6 and diode D1～D6.
Transistor Q1～Q6 is the switch element that carries out switch motion as the pulse signal of control signal that provides according to control assembly 17.This transistor Q1～Q6 uses for example IGBT (InjectionEnhanced Gate Transistor).
The collector electrode of transistor Q1, Q3, Q5 is connected on the positive pole of direct current smmothing capacitor 11.The collector electrode of transistor Q2, Q4, Q6 is connected on the emitter of transistor Q1, Q3, Q5 separately, and its emitter is connected on the negative pole of direct current smmothing capacitor 11 separately.
On the tie point of the collector electrode of the emitter of transistor Q1 and transistor Q2, be connected with the U phase winding of induction motor (being labeled as " IM " among the figure) 19.On the tie point of the collector electrode of the emitter of transistor Q3 and transistor Q4, be connected with the V phase winding.On the tie point of the collector electrode of the emitter of transistor Q5 and transistor Q6, be connected with the W phase winding.And transistor Q1～Q6 provides voltage command signal as control signal to each grid of transistor Q1～Q6.Voltage command signal is a pulse signal.Transistor Q1～Q6 carries out switching according to pulse signal.
Diode D1～D6 makes the diode of the output current change of current when transistor Q1～Q6 turn-offs.The negative pole of each diode D1～D6 is connected with the collector electrode of transistor Q1～Q6 respectively; Each positive pole is connected with the emitter of transistor Q1～Q6 respectively.
U phase current detector 13, V phase current detector 14 detect current value iu, the iw of output current of the elementary winding (stator winding) of the U phase that offers induction motor 19, W phase separately.
Direct-current coupling voltage detector 16 detect by direct current smmothing capacitor 11 level and smooth the magnitude of voltage Vdc of direct voltage.
The judgment means 17a that control assembly 17 has the current value of the output current of judging voltage transformation parts 12 reduces device 17b with the compensation rate that compensation rate idle time is set.Control assembly 17 is obtained current value iu, iv from U phase current detector 13, V phase current detector 14 respectively, according to current value iu, the iv control voltage transformation parts of obtaining 12.The enough CPU of control assembly 17 energy wait and constitute.In addition, in the present embodiment, as the parts that use as the vector control of control method, control assembly 17 generate voltage command signal Tst (u), Tst as pulse signal (v), Tst (w), and these signals are outputed to voltage transformation parts 12.
In addition, control assembly 17 find the solution corresponding to the current value that detects electric current and idle time compensation rate Tdcom.Control assembly 17 carries out voltage command signal Tst (u), Tst (v), the compensation idle time of Tst (w) according to time slot compensation rate Tdcom.
For carrying out such compensation idle time, limiting value Iref (A), Iref (B), Iref (C) are set for the current value that detects electric current.
Limiting value Iref (A) is the current value according to the accuracy of detection setting of output current.This limiting value Iref (A) is set to about 10% of rated current for example.Limiting value Iref (B) is the limiting value according to the switching speed setting of transistor Q1～Q6.This Iref (B) is set to about 20% of rated current for example.Whether Iref (C) is to be 0 limiting value for the compensation rate of judging idle time compensation.This Iref (C) is set to about 5% of rated current for example.
The following describes the action of the converting means of present embodiment.
Direct current smmothing capacitor 11 is with the direct voltage advection of DC power supply 18.By direct current smmothing capacitor 11 level and smooth direct-current coupling voltage be applied on the transistor Q1～Q6 of voltage transformation parts 12.Direct-current coupling voltage detector 16 detects the magnitude of voltage Vdc of this direct-current coupling voltage.
Switching by transistor Q1～Q6 generates alternating voltage.Consequently, electric current flows through U phase, the V phase of induction motor 19, each winding of W phase.U phase current detector 13, V phase current detector 14 detect current value iu, the iv of the electric current of the U phase that flows through induction motor 19, V phase respectively.
Flow chart according to Fig. 2 illustrates this action.
In addition, the current value of the current i w of W phase is that condition according to three-phase equilibrium is calculated by U phase current values iu and V phase current values iv.
(v), Tst (w) carries out compensation idle time (step S18) to voltage command signal Tst (u), the Tst that 17 pairs of control assemblies have generated.
According to Fig. 3 this compensation idle time is described.
The interval IV of Iref (B)＜Im is the interval that can correctly detect current value I m.In this interval, idle time, compensation rate Tdcom was fixed value (kded1).
In the interval III of Iref (A)＜Im≤Iref (B), in case idle time, compensation rate was set to fixed value kded1, then along with current value I m diminishes, compensation idle time will be excessive.So, in interval III, reduce compensation rate Tdcom idle time along with current value I m.
Compensation rate Tdcom idle time of interval III can obtain according to following formula (1).
Tdcom＝(kded1-kded2)*(Im-Iref(A))/(Iref(B)-Iref(A))+kded2…(1)
In the interval II of Iref (C)＜Im≤Iref (A), current value I m continues to diminish, and then the voltage reduction also diminishes.For this reason, if compensation rate Tdcom idle time is set, just might produces overcompensation and make the output voltage of converting means and output current produce deviation according to formula (1).So at interval II, along with diminishing of current value I m, idle time, the reduced rate of compensation rate Tdcom was bigger.
Compensation rate Tdcom idle time of interval II can obtain according to following formula (2).
Tdcom＝kded2*(Im-Iref(C))/(Iref(A)-Iref(C)) …(2)
In the interval I of 0＜Im≤Iref (C), according to the accuracy of detection of U phase current detector 13, V phase current detector 14 etc., it is difficult that the positive negative judgement of electric current also becomes, if Tdcom＞0 is set, then can compensate by mistake, make the output voltage of converting means and output current produce deviation.So idle time, compensation rate Tdcom was set to 0 in interval I.
Flow chart according to Fig. 4 illustrates this action.
In addition, the action of compensation rate is common at U phase, V phase, W mutually owing to idle time, so describe in this compensation idle time to the U phase.
Current value I m is the current value of the output current of the converting means that detects by U phase current detector 13, V phase current detector 14.
Judge current value I m less than, when equaling limiting value Iref (C) (being among the step S23), control assembly compensation rate Tdcom 17 idle time is set to 0 (step S24).
Secondly, under the situation of judging the current value I m value of overstepping the extreme limit Iref (C) (denying among the step S23), 17 couples of current value I m of control assembly whether below limiting value Iref (A) (Im≤Iref (A)) judge (step S26).
Judging current value is (being among the step S26) under the situation below limiting value Iref (A), and control assembly 17 calculates compensation rate Tdcom idle time (step S27) according to formula (2).
After control assembly 17 calculates compensation rate Tdcom idle time, carry out the symbol decision (step S28) of current value I m at once.
The symbol Tsgn of current value I m is (being among the step S28) under the positive situation, owing to be compensation idle time of going up the voltage command signal Tst of branch road (transistor Q1, Q3, Q5), thus control assembly 17 carry out from the pulse duration tst of voltage command signal Tst, deducting calculate according to formula (2) idle time compensation rate Tdcom calculating (step S29).
The symbol Tsgn of current value I m for negative situation under (among the step S28 not), owing to be compensation idle time of the down voltage command signal Tst of branch road (transistor Q2, Q4, Q6), control assembly 17 carry out on the pulse duration of voltage command signal Tst, adding calculate according to formula (2) idle time compensation rate Tdcom calculating (step S30).
Secondly, under the situation of judging the current value I m value of overstepping the extreme limit Iref (A) (denying among the step S27), control assembly 17 judge current value I m whether less than, equal limiting value Iref (B) (step S31).
Judging current value I m is that control assembly 17 calculates compensation rate Tdcom idle time (step S32) according to formula (1) when limiting value Iref (B) is following (being among the step S31).
Then, control assembly under the symbol of current value I m is positive situation, carry out from the pulse duration tst of voltage command signal Tst, deducting calculate according to formula (1) idle time compensation rate Tdcom calculating.Control assembly 17 symbol Tsgn for negative situation under, carry out on the pulse duration of voltage command signal Tst, adding calculate according to formula (1) idle time compensation rate Tdcom calculating (step S28～S30).
Secondly, under the situation of judging the current value I m value of overstepping the extreme limit Iref (B) (denying among the step S31), control assembly compensation rate Tdcom 17 idle time is set to fixed value kded1 (step S33).
Then, control assembly 17 carries out deducting the computing of this idle time of compensation rate Tdcom from the pulse duration tst of voltage command signal Tst under the symbol Tsgn of current value I m is positive situation.Control assembly 17 symbol Tsgn for negative situation under, carry out on the pulse duration tst of voltage command signal Tst, adding computing (the step S28～S30) of this idle time of compensation rate Tdcom.
As described above, according to present embodiment, owing to be that current value according to output current is provided with compensation rate idle time, so just can carry out compensating optimal idle time by simple calculating corresponding to the output current of converting means.
So, under the situation that at the output frequency number of converting means be about 1～5Hz, pulse duration narrows down, also can prevent current waveform generation deviation, it is stable to keep voltage.So, just can improve the driveability of induction motor 19 when low frequency drives thus especially, can realize the miniaturization and the low cost of converting means.
In addition,, can consider various forms, be not limited to the above embodiments corresponding to enforcement of the present invention.
For example, limiting value Iref (A), Iref (B), Iref (C) are not limited to value such in the present embodiment.Corresponding to accuracy of detection of the switching speed of noise, switch element etc., U phase current detector 13, v phase detector 14 etc., these values can be set suitably.
In addition, the transistor Q1～Q6 of voltage transformation parts 12 corresponding to power capacity, can use bipolar transistor, FET (field effect transistor), thyratron transistor etc.
In addition, induction motor 19 not only can be 3 phases, 2 phases also can, or surpass the heterogeneous also passable of 3 phases.Can also not induction motor, and use synchronous motor.
In addition, the speed control of induction motor is not limited in vector control, also can use disposable FREQUENCY CONTROL, voltage/frequency control.
As described above, can prevent the mistake compensation according to the present invention.
Claims (9)
1. converting means is characterized in that comprising:
The switch element that is connected in series, be applied in direct voltage;
By above-mentioned each switch element is the voltage transformation parts of alternating voltage according to the switching of control signal and with above-mentioned dc voltage conversion separately; And
Current value setting according to the output current of above-mentioned voltage transformation parts produces compensation rate idle time that is used for compensating idle time that short circuit is provided with in order to prevent that the above-mentioned switch element that is connected in series from connecting simultaneously, and the above-mentioned control signal that will carry out compensation idle time offers the control assembly of above-mentioned voltage transformation parts.
2. converting means according to claim 1 is characterized in that:
Above-mentioned control assembly surpasses under the situation of the 1st limiting value at the current value of above-mentioned output current, fixing above-mentioned idle time of compensation rate is set, the current value of this output current less than, when equaling the 1st limiting value, above-mentioned idle time of compensation rate is set corresponding to the current value of this output current.
3. converting means according to claim 2 is characterized in that:
Above-mentioned control assembly the current value of above-mentioned output current less than, when equaling above-mentioned the 1st limiting value, if the current value step-down of this output current then is provided with above-mentioned idle time of the compensation rate that has reduced.
4. converting means according to claim 3 is characterized in that:
Above-mentioned control assembly the current value of above-mentioned output current less than, equal above-mentioned the 1st limiting value and than the high situation of the 2nd limiting value that is lower than the 1st limiting value under, if above-mentioned idle time of the compensation rate that the current value step-down of this output current is provided with then that reduced rate with regulation reduced, the current value of this output current less than, strengthen this reduced rate when equaling the 2nd limiting value.
5. converting means according to claim 4 is characterized in that:
Above-mentioned control assembly the current value of above-mentioned output current less than, when equaling than also low the 3rd limiting value of above-mentioned the 2nd limiting value, it is 0 that above-mentioned idle time compensation rate is set, and does not carry out the compensation of above-mentioned idle time.
6. converting means according to claim 1 is characterized in that:
Above-mentioned control assembly has:
The 1st limiting value that the current value of the output current of above-mentioned voltage transformation parts and switching speed according to above-mentioned switch element are set in advance compares, the current value of judging this output current whether less than, equal the judgment means of the 1st limiting value; And
The current value of judging above-mentioned output current in above-mentioned judgment means less than, when equaling above-mentioned the 1st limiting value, if the current value step-down of above-mentioned output current then be provided with reduced above-mentioned idle time compensation rate compensation rate reduce device.
7. converting means according to claim 6 is characterized in that:
The current value that above-mentioned judgment means is judged above-mentioned output current whether less than, equal above-mentioned the 1st limiting value, simultaneously the current value of above-mentioned output current and the 2nd limiting value that is lower than the 1st limiting value that is provided with corresponding to the accuracy of detection of this current value are compared, and the current value of judging above-mentioned output current whether less than, equal the 2nd limiting value;
Above-mentioned compensation rate reduce current value that device judges above-mentioned output current in above-mentioned judgment means less than, when equaling above-mentioned the 2nd limiting value, the above-mentioned reduced rate of the current value of above-mentioned output current is strengthened.
8. converting means according to claim 7 is characterized in that:
The current value that above-mentioned judgment means is also judged above-mentioned output current whether less than, equal to be lower than the 3rd limiting value of above-mentioned the 2nd limiting value;
Above-mentioned compensation rate reduce current value that device judges above-mentioned output current in above-mentioned judgment means less than, when equaling above-mentioned the 3rd limiting value, above-mentioned idle time, compensation rate was set to 0, did not carry out the compensation of above-mentioned idle time.
9. the idle time compensating method of a converting means,
Described converting means has the switch element that is applied in direct voltage that is connected in series and is the voltage transformation parts of alternating voltage by above-mentioned switch element according to the switching of control signal and with above-mentioned dc voltage conversion, it is characterized in that comprising the following steps:
Current value setting according to the output current of above-mentioned voltage transformation parts produces the idle time that short circuit is provided with in order to prevent that the above-mentioned switch element that is connected in series from connecting simultaneously;
The above-mentioned control signal that has compensated idle time is offered above-mentioned voltage transformation parts.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002070975A JP2003274673A (en) | 2002-03-14 | 2002-03-14 | Inverter apparatus and dead time compensation method thereof |
| JP070975/2002 | 2002-03-14 |
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| Publication Number | Publication Date |
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| CN1445918A true CN1445918A (en) | 2003-10-01 |
| CN1307779C CN1307779C (en) | 2007-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031204279A Expired - Fee Related CN1307779C (en) | 2002-03-14 | 2003-03-14 | Conversion device and its idle time compensation method |
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| JP (1) | JP2003274673A (en) |
| CN (1) | CN1307779C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951212A (en) * | 2009-07-10 | 2011-01-19 | 株式会社捷太格特 | Control device of electric motor and electric power-assisted steering apparatus |
| CN103280808A (en) * | 2013-06-08 | 2013-09-04 | 南京因泰莱电器股份有限公司 | Variable ring width hysteresis current control method based on timer |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4508631B2 (en) * | 2003-12-25 | 2010-07-21 | 三洋電機株式会社 | Inverter for grid connection |
| KR100942136B1 (en) | 2007-12-28 | 2010-02-16 | 엘에스산전 주식회사 | Apparatus and method for compensating a dead time |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0179872B1 (en) * | 1996-03-26 | 1999-05-15 | 이종수 | A dead time compensating method of an inverter for a motor drive |
| CN1107847C (en) * | 1996-12-03 | 2003-05-07 | Lg电子株式会社 | Method for compensating dead time of compressor in air conditioner |
-
2002
- 2002-03-14 JP JP2002070975A patent/JP2003274673A/en active Pending
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2003
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951212A (en) * | 2009-07-10 | 2011-01-19 | 株式会社捷太格特 | Control device of electric motor and electric power-assisted steering apparatus |
| CN101951212B (en) * | 2009-07-10 | 2014-10-01 | 株式会社捷太格特 | Motor controller and electric power steering system |
| CN103280808A (en) * | 2013-06-08 | 2013-09-04 | 南京因泰莱电器股份有限公司 | Variable ring width hysteresis current control method based on timer |
| CN103280808B (en) * | 2013-06-08 | 2015-05-20 | 南京因泰莱电器股份有限公司 | Variable ring width hysteresis current control method based on timer |
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| CN1307779C (en) | 2007-03-28 |
| JP2003274673A (en) | 2003-09-26 |
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Granted publication date: 20070328 |