CN1355596A - Dead area compensation method for PWM-type frequency-conversion power supply - Google Patents
Dead area compensation method for PWM-type frequency-conversion power supply Download PDFInfo
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- CN1355596A CN1355596A CN 01144167 CN01144167A CN1355596A CN 1355596 A CN1355596 A CN 1355596A CN 01144167 CN01144167 CN 01144167 CN 01144167 A CN01144167 A CN 01144167A CN 1355596 A CN1355596 A CN 1355596A
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Abstract
A dead-area compensation method for the PWM-type frequency-converting power supply is disclosed. The three-phase PWM votage signals output by the power supply to be controlled is isolated and converted to obtain positive or negative level signal. Then, an instruction PWM signal is generated and delayed by 2-3 microseconds to obtain a positive or negative edge jumping signal. The state of the said level is read out for performing compensation according to the positive or negative polarity of signal. Its advantages include high output torque, and no distortion of current waveform.
Description
Technical field
The present invention relates to a kind of method that is used for the PWM-type frequency-conversion power supply dead area compensation, belong to electric and electronic technical field.
Background technology
In the variable frequency power supply of various PWM-type,, all be provided with Dead Time for two pipes up and down that prevent a brachium pontis of switching device power model damage owing to straight-through.In Dead Time, because pipe does not all have triggering signal up and down, output voltage depends on the polarity of output current fully, so output voltage is uncontrollable.Its direct result that causes is exactly to produce error between the output voltage and instruction voltage, and output current produces distortion.If load is a motor, then change according to producing pulsation, during low speed, the ability that certificate is changeed in output reduces, even the situation with not dynamic load occurs.
In the existing frequency converter, generally all this Dead Time is compensated.It is the method that adopts software that a kind of compensation method is arranged, and by electric current is detected, judges that its polarity obtains the direction of dead area compensation, and its theory diagram is seen accompanying drawing 1.Wherein IM is a load motor, carries out current sample with Hall element and obtains sense of current signI, with this foundation as judgement dead area compensation direction.In this method, maximum shortcoming is exactly in the sampling process of this analog signal of electric current, inevitably is mixed with noise signal, and this noise signal is difficult to by general method filtering, therefore may cause the mistake of current polarity detection, thereby cause the generation of mistake compensation.The another kind of method that the dead band is compensated is the pulse duration by sampling output phase voltage, and and instruction pulse voltage width compares, with the foundation of this difference as the direction of dead area compensation.The shortcoming of the maximum of this method is, the acquisition of the pulse duration of output phase voltage is difficulty relatively, needs to rely on complicated hardware circuit, and will take a large amount of resource of CPU, and the delay of two switch periods is arranged in the compensation process.
Summary of the invention
The objective of the invention is to propose a kind of method that is used for the PWM-type frequency-conversion power supply dead area compensation, the drawback of bringing to rely on current detecting in the dead-zone compensation method that overcomes prior art.Depend on simple hardware circuit and detect phase voltage positive and negative in Dead Time, and reduce delay as far as possible, obtain dead area compensation direction accurately, thereby obtain compensation effect accurately and effectively in the last time of control.
The method that is used for the PWM-type frequency-conversion power supply dead area compensation that the present invention proposes comprises following each step:
(1) with A, B, the C three-phase pulse width modulated voltage signal of charged power output, behind isolated variable, obtains positive and negative level signal P
a, P
b, P
c, to express each positive and negative at each voltage of exporting constantly of charged power;
(2) produce an instruction pulse-width signal W
a, W
b, Wc, and 2～3 microseconds of delaying time obtain a positive and negative hopping edge signal, are jumping the edge constantly to P with this signal
a, P
b, P
cCatch the signal D that obtains exporting
a, D
b, D
c, output voltage is positive and negative in this signal reaction Dead Time;
(3) read D
a, D
b, D
cThe high-low level state, output voltage is timing in the state representation Dead Time of signal, corresponding compensation is to instruct the last brachium pontis drive signal of corresponding phase of pulse-width signal to shorten a compensation rate, the drive signal of following brachium pontis prolongs a compensation rate, when output voltage in the state representation Dead Time of signal when negative, corresponding compensation is to instruct the last brachium pontis drive signal of corresponding phase of pulse-width signal to prolong a compensation rate, and the drive signal of following brachium pontis shortens a compensation rate.
Method of the present invention is applied in the dead area compensation of frequency converter, certificate is changeed in output when greatly having improved low speed, avoided in the former dead-zone compensation method greatly having improved the waveform of output current owing to current polarity detects inaccurate current waveform distortion, the torque ripple phenomenon that causes; Make it can be good at forcing in sine wave.
Description of drawings
Fig. 1 is the theory diagram that carries out dead area compensation in the prior art with software approach.
Fig. 2 is the theory diagram that is used for the PWM-type frequency-conversion power supply dead-zone compensation method that the present invention proposes.
Fig. 3 is a circuit diagram of realizing the Signal Spacing conversion of the inventive method.
Fig. 4 is a circuit diagram of realizing the signal capture of the inventive method.
Fig. 5 is the sequential chart of each signal in a pulse width modulation cycle.
Embodiment
As an embodiment of this method, for three phase frequency changing power has designed a cover hardware unit, and to cooperate with 80C196MC be that the algorithm routine of CPU has been realized above-mentioned dead-zone compensation method.Concrete hardware unit comprises Signal Spacing conversion fraction circuit, the signal capture circuit, respectively as shown in Figure 3, Figure 4.Pulse width modulation mode among the 80C196MC is modulated with seven sections symmetries, and the driving switch device is open-minded during output low level.Sequential in a pulse width modulation cycle as shown in Figure 5.Carry out dead area compensation algorithm and pulse width modulation algorithm constantly at t0.Obtaining the Da signal in algorithm as shown in the figure is high level, and output voltage then when calculating the pulse-width modulation width of following one-period, will calculate width and deduct one and compensate width and get final product for just in the expression Dead Time.Otherwise,, then will calculate width and add that a compensation width gets final product if the Da signal that obtains is a low level.
Claims (1)
1, a kind of method that is used for the PWM-type frequency-conversion power supply dead area compensation is characterized in that this method comprises following each step:
(1) with A, B, the C three-phase pulse width modulated voltage signal of charged power output, behind isolated variable, obtains positive and negative level signal P
a, P
b, P
c, to express each positive and negative at each voltage of exporting constantly of charged power;
(2) produce an instruction pulse-width signal W
a, W
b, Wc, and 2～3 microseconds of delaying time obtain a positive and negative hopping edge signal, are jumping the edge constantly to P with this signal
a, P
b, P
cCatch the signal D that obtains exporting
a, D
b, D
c, output voltage is positive and negative in this signal reaction Dead Time;
(3) read D
a, D
b, D
cThe high-low level state, output voltage is timing in the state representation Dead Time of signal, corresponding compensation is to instruct the last brachium pontis drive signal of corresponding phase of pulse-width signal to shorten a compensation rate, the drive signal of following brachium pontis prolongs a compensation rate, when output voltage in the state representation Dead Time of signal when negative, corresponding compensation is to instruct the last brachium pontis drive signal of corresponding phase of pulse-width signal to prolong a compensation rate, and the drive signal of following brachium pontis shortens a compensation rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144167 CN1120564C (en) | 2001-12-14 | 2001-12-14 | Dead area compensation method for PWM-type frequency-conversion power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144167 CN1120564C (en) | 2001-12-14 | 2001-12-14 | Dead area compensation method for PWM-type frequency-conversion power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1355596A true CN1355596A (en) | 2002-06-26 |
| CN1120564C CN1120564C (en) | 2003-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01144167 Expired - Fee Related CN1120564C (en) | 2001-12-14 | 2001-12-14 | Dead area compensation method for PWM-type frequency-conversion power supply |
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|---|---|
| CN (1) | CN1120564C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100388610C (en) * | 2003-10-24 | 2008-05-14 | 力博特公司 | UPS inverter and its pulse width modulation dead-zone compensation method |
| CN100426172C (en) * | 2005-04-13 | 2008-10-15 | 通嘉科技股份有限公司 | Adaptive failure time controller capable of regulating failure time |
| CN102005955A (en) * | 2010-11-30 | 2011-04-06 | 中冶南方（武汉）自动化有限公司 | Dead zone compensation method based on DSP (Digital Signal Processor) controller |
| CN102710165A (en) * | 2012-03-19 | 2012-10-03 | 天津大学 | Improved method for controlling direct current (DC) bus voltage of two-stage converter |
| CN103219940A (en) * | 2012-11-01 | 2013-07-24 | 东方日立(成都)电控设备有限公司 | Suppression method of electromotor vibration |
| CN110429803A (en) * | 2019-09-03 | 2019-11-08 | 上海沪工焊接集团股份有限公司 | Driving circuit and inverter |
-
2001
- 2001-12-14 CN CN 01144167 patent/CN1120564C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100388610C (en) * | 2003-10-24 | 2008-05-14 | 力博特公司 | UPS inverter and its pulse width modulation dead-zone compensation method |
| CN100426172C (en) * | 2005-04-13 | 2008-10-15 | 通嘉科技股份有限公司 | Adaptive failure time controller capable of regulating failure time |
| CN102005955A (en) * | 2010-11-30 | 2011-04-06 | 中冶南方（武汉）自动化有限公司 | Dead zone compensation method based on DSP (Digital Signal Processor) controller |
| CN102005955B (en) * | 2010-11-30 | 2013-02-27 | 中冶南方（武汉）自动化有限公司 | Dead zone compensation method based on DSP (Digital Signal Processor) controller |
| CN102710165A (en) * | 2012-03-19 | 2012-10-03 | 天津大学 | Improved method for controlling direct current (DC) bus voltage of two-stage converter |
| CN102710165B (en) * | 2012-03-19 | 2014-10-15 | 天津大学 | Improved method for controlling direct current (DC) bus voltage of two-stage converter |
| CN103219940A (en) * | 2012-11-01 | 2013-07-24 | 东方日立(成都)电控设备有限公司 | Suppression method of electromotor vibration |
| CN110429803A (en) * | 2019-09-03 | 2019-11-08 | 上海沪工焊接集团股份有限公司 | Driving circuit and inverter |
| CN110429803B (en) * | 2019-09-03 | 2024-04-23 | 上海沪工焊接集团股份有限公司 | Driving circuit and inverter power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1120564C (en) | 2003-09-03 |
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