CN102522912B - Bipolar SPWM (Sinusoidal Pulse Width Modulation) type adaptive dead-zone compensation method - Google Patents
Bipolar SPWM (Sinusoidal Pulse Width Modulation) type adaptive dead-zone compensation method Download PDFInfo
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- CN102522912B CN102522912B CN201210002681.6A CN201210002681A CN102522912B CN 102522912 B CN102522912 B CN 102522912B CN 201210002681 A CN201210002681 A CN 201210002681A CN 102522912 B CN102522912 B CN 102522912B
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Abstract
The invention relates to a bipolar SPWM (Sinusoidal Pulse Width Modulation) type adaptive dead-zone compensation method. Generally, compensation positions are inaccurate and compensation effects are poor because a dead-zone compensation method can not be used for accurately positioning two periods of zone which does not need dead-zone compensation and the two periods of zone greatly change with power change. One side of an inverter is used for acquiring signals of an upper envelope and a lower envelope of an inductance current through a peak taking circuit and sending the signals to a DSP (Digital Signal Processor) controller, and adapter dead-zone compensation is realized through the following steps, wherein a digital quantity of a modulation signal compared with a carrier is CMP, dead zone time of an upper pipe and a lower pipe of the same bridge arm is dead time, and whether dead-zone compensation is carried out is judged according to values of the upper envelope and the lower envelope of the inductance current. On the basis of increasing a sample hardware circuit, a limit whether needing dead-zone compensation is automatically found, thus a position of dead-zone compensation is regulated in real time, and an ideal dead-zone compensation effect can be achieved under any power.
Description
Technical field
The present invention relates to a kind of adaptive dead zone compensation method of bipolar SPWM modulation system.
Background technology
In bridge circuit, while using bipolar SPWM modulation system, for fear of same brachium pontis Switch Cut-through, conventionally can in the driving pulse of same brachium pontis, reserve dead band, will cause like this duty-cycle loss of switching tube, make the THD of output waveform larger, due in numerically controlled bipolar SPWM modulation system, the dead band producing method of the switching tube up and down of same brachium pontis is actually by the rise edge delay of each driving realized, so dead area compensation is to realize by the driving pulse width of increase main switch conventionally, conventionally dead-zone compensation method can not accurately be located these two periods that do not need dead area compensation, and along with the variation of power also has larger variation, cause compensated position inaccurate, compensation effect is very undesirable.
Summary of the invention
Technical problem solved by the invention is to provide a kind of adaptive dead zone compensation method of bipolar SPWM modulation system.
For solving above-mentioned technical problem, the technical scheme that the present invention takes:
A kind of adaptive dead zone compensation method of bipolar SPWM modulation system, its special character is: first a side of inverter by get peak value circuit by the signals collecting of the envelope up and down of inductive current to sending into dsp controller, realize adaptive dead zone compensation by following steps again, the digital quantity of the modulation signal of wherein comparing with carrier wave is CMP, and the Dead Time of the pipe up and down of same brachium pontis is deadtime:
(1), when the coenvelope line of inductive current is greater than 0, lower envelope line is while being also greater than 0: inductive current waveform is for just, because supervisor's duty-cycle loss is caused in dead band, therefore need to add dead area compensation, make CMP=CMP+deadtime/2, can realize the full remuneration in dead band;
(2), when the coenvelope line of inductive current is greater than 0, lower envelope line is while being less than 0: now inductive current positive going zeror crossing, supervisor's duty-cycle loss also there is no impact to waveform, does not need dead area compensation, CMP=CMP;
(3), when the coenvelope line of inductive current is less than 0, lower envelope line is while being greater than 0: inductive current positive going zeror crossing, supervisor's duty-cycle loss also there is no impact to waveform, does not need dead area compensation, CMP=CMP;
(4), when inductive current coenvelope line is less than 0, lower envelope line is while being also less than 0: now inductive current waveform is for negative, and dead area compensation mode is: CMP=CMP-deadtime/2, can realize the full remuneration in dead band.
When above-mentioned CMP increases deadtime/2, drive signal to shift to an earlier date deadtime/2 time reversal at the trailing edge of carrier wave so, overturn in the rise edge delay deadtime/2 time of carrier wave, drive like this signal just to increase the time of deadtime.
The above-mentioned peak value circuit employing of getting is got positive peak circuit and is got negative peak circuit.
The above-mentioned positive peak circuit of getting is inductive current I
lafter over-sampling circuit is scaled, pass through diode D
1, resistance R
1divide two-way output: a road is through resistance R
2, DC power supply V
1, capacitor C
1be connected with amplifying circuit, another road is connected with amplifying circuit, after the low pass signal filter LPF filtering after amplifying circuit reduction, obtains signal V1LP1.
The above-mentioned negative peak circuit of getting is inductive current I
lafter over-sampling circuit is scaled, pass through diode D
2, resistance R
3divide two-way output: a road is through resistance R
3, DC power supply V
2, capacitor C
2be connected with amplifying circuit, another road is connected with amplifying circuit, after the low pass signal filter LPF filtering after amplifying circuit reduction, obtains signal V1LV1.
Compared with prior art, the present invention, increasing on simple hardware circuit basis, by automatically finding the boundary that whether needs dead area compensation, adjusts the position of dead area compensation in real time, can under any power, can reach the method for desirable dead area compensation effect.
Brief description of the drawings
Fig. 1 is the schematic diagram that SPWM dead band produces;
Fig. 2 is dead area compensation boundary line chart;
Fig. 3 is the positive peak circuit of getting of the present invention;
Fig. 4 is the negative peak circuit of getting of the present invention;
Fig. 5 is that the peak value circuit of getting of the present invention is connected block diagram with circuit system.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Referring to Fig. 1, due in numerically controlled bipolar SPWM modulation system, the dead band producing method of the switching tube up and down of same brachium pontis is actually by the rise edge delay of each driving is realized, so dead area compensation is that driving pulse width by increasing main switch is realized conventionally.
Referring to Fig. 2, in ambipolar SPWM modulation system, be not all to need dead area compensation within whole sinusoidal wave period, in near a period of time zero passage place (before the conducting of master control pipe, the anti-phase afterflow of inductive current also do not finish), not need dead area compensation, and length during this period of time and the size of filter inductance and the size of electric current are relevant, conventionally dead-zone compensation method can not accurately be located these two periods that do not need dead area compensation, and along with the variation of power also has larger variation, cause compensated position inaccurate, compensation effect is very undesirable.
Now definition, the digital quantity of the modulation signal of comparing with carrier wave is CMP, the Dead Time of the pipe up and down of same brachium pontis is deadtime.
Analyze current waveform and need to add the position of dead area compensation to obtain, all be greater than 0 or to be all less than in 0 be the position that need to add the compensation in dead band at the envelope up and down of inductive current waveform, and one of the envelope up and down of inductive current waveform be greater than 0 another be not need dead area compensation when being less than 0, therefore, inductive current is done to one and get peak value circuit (upward peak and lower peak value), for example Fig. 3, the positive negative signal of the envelope up and down of inductive current is sent in DSP, just can realize the adaptive dead zone compensation of bipolar SPWM according to these two signals.Specific implementation step is as follows:
(1), when the coenvelope line of inductive current is greater than 0, lower envelope line is while being also greater than 0: now inductive current waveform is for just, know the duty-cycle loss that causes supervisor due to dead band according to analysis, therefore need to add dead area compensation, at this moment, order: CMP=CMP+deadtime/2, can realize the full remuneration in dead band;
(2), when the coenvelope line of inductive current is greater than 0, lower envelope line is while being less than 0: now inductive current positive going zeror crossing, also there is no impact to waveform according to analyzing now supervisor's duty-cycle loss, so do not need dead area compensation, CMP=CMP during this period of time;
(3), when the coenvelope line of inductive current is less than 0, lower envelope line is while being greater than 0: equally do not need dead area compensation yet;
(4), when inductive current coenvelope line is less than 0, lower envelope line is while being also less than 0: now inductive current waveform is for negative, and now dead area compensation mode is: CMP=CMP-deadtime/2, can realize the full remuneration in dead band.
Because modulating wave can be all crossing with the rising edge of carrier wave and trailing edge, so in the time that CMP increases deadtime/2, drive signal to shift to an earlier date deadtime/2 time reversal at the trailing edge of carrier wave so, the rise edge delay deadtime/2 time at carrier wave overturns, and drives like this signal just just to increase the time of deadtime.
For fear of the oscillating waveform that adds suddenly dead area compensation to cause at line of demarcation place, can divide several switch periods gradually to add the digital quantity of dead area compensation.
The above-mentioned peak value circuit employing of getting is got positive peak circuit and is got negative peak circuit.
Get the coenvelope line that positive peak circuit can obtain input signal (being the inductive current shown in Fig. 2), same, get negative peak circuit and can obtain the lower envelope line of input signal.Example circuit as shown in Figure 3 and Figure 4, is a kind of conventional getting positive peak circuit and get negative peak circuit.In Fig. 3, inductive current I
lthrough over-sampling circuit with certain proportion (after after k) dwindling in Fig. 3 by diode D
1to capacitor C
1charging, owing to there being stopping of diode, once the I of input
lbe greater than capacitor C
1voltage will be to capacitor C
1charging, capacitor C
1voltage can only pass through resistance R
2electric discharge, wherein R
2with C
1parallel connection, can suitably choose R
2resistance, such as R
2=100k, makes capacitor C
2voltage electric discharge time neither can too soon can be too not slow yet.Wherein V
1for at I
lnegative half-wave time in order to make capacitor discharge faster, its size should at least be greater than I
lthe maximum of signal.Pass through module 1/k reduction ratio from C1 signal out, then by obtaining signal V1LP1 after low pass filter LPF filtering.
Referring to Fig. 4, for getting negative peak circuit, inductor current signal is passed through diode D after dwindling by sampling ratio k
2and resistance R
3for capacitor C
2charging, wherein R
4for capacitor C
2discharge loop resistance, with C
2parallel connection, reduces signal through 1/k afterwards, then after low pass filter LPF filtering, obtains V1LV1.
Referring to Fig. 5, by giving respectively and get positive peak circuit and get negative peak circuit after inductive current sampling, the signal obtaining is sent into dsp controller.
Claims (2)
1. the adaptive dead zone compensation method of a bipolar SPWM modulation system, first a side of inverter by get peak value circuit by the signals collecting of the envelope up and down of inductive current to sending into dsp controller, realize adaptive dead zone compensation by following steps again, the digital quantity of the modulation signal of wherein comparing with carrier wave is CMP, and the Dead Time of the pipe up and down of same brachium pontis is deadtime:
(1), when the coenvelope line of inductive current is greater than 0, lower envelope line is while being also greater than 0: inductive current waveform is for just, because supervisor's duty-cycle loss is caused in dead band, therefore need to add dead area compensation, make CMP=CMP+deadtime/2, can realize the full remuneration in dead band;
(2), when the coenvelope line of inductive current is greater than 0, lower envelope line is while being less than 0: now inductive current positive going zeror crossing, supervisor's duty-cycle loss also there is no impact to waveform, does not need dead area compensation, CMP=CMP;
(3), when inductive current coenvelope line is less than 0, lower envelope line is while being also less than 0: now inductive current waveform is for negative, and dead area compensation mode is: CMP=CMP-deadtime/2, can realize the full remuneration in dead band;
When described CMP increases deadtime/2, drive signal to shift to an earlier date deadtime/2 time reversal at the trailing edge of carrier wave so, overturn in the rise edge delay deadtime/2 time of carrier wave, drive like this signal just to increase the time of deadtime; The described peak value circuit employing of getting is got positive peak circuit and gets negative peak circuit, it is characterized in that: the described positive peak circuit of getting is inductive current I
lafter over-sampling circuit is scaled, pass through diode D
1, resistance R
1divide two-way output: a road is through resistance R
2, DC power supply V
1, capacitor C
1be connected with amplifying circuit, another road is connected with amplifying circuit, and the signal after amplifying circuit reduction obtains signal V1LP1 after low pass filter LPF filtering.
2. the adaptive dead zone compensation method of bipolar SPWM modulation system according to claim 1, is characterized in that: the described negative peak circuit of getting is inductive current I
lafter over-sampling circuit is scaled, pass through diode D
2, resistance R
3divide two-way output: a road is through resistance R
3, DC power supply V
2, capacitor C
2be connected with amplifying circuit, another road is connected with amplifying circuit, and the signal after amplifying circuit reduction obtains signal V1LV1 after low pass filter LPF filtering.
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| CN102969927A (en) * | 2012-12-10 | 2013-03-13 | 成都芯源系统有限公司 | Step-down switching power supply and control method thereof |
| CN106100393B (en) * | 2016-07-14 | 2018-11-20 | 中车大连电力牵引研发中心有限公司 | Single-phase four-quadrant rectifier dead-zone compensation method and device |
| CN107508482B (en) * | 2017-08-31 | 2018-07-20 | 四川大学 | A kind of three-phase two-level inverter Dead-time compensation method based on SPWM technologies |
| CN108011509A (en) * | 2018-01-15 | 2018-05-08 | 国网安徽省电力公司合肥供电公司 | Dead band generative circuit based on inductance |
| CN109067230B (en) * | 2018-09-27 | 2020-04-24 | 重庆大学 | Online adaptive dead zone elimination method for SiC MOSFET inverter |
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| JP2002272117A (en) * | 2001-03-14 | 2002-09-20 | Hitachi Ltd | Power converter for linking of systems |
| CN101174811B (en) * | 2007-10-19 | 2011-05-11 | 奇瑞汽车股份有限公司 | Electric motor control method and device adopting space vector pulse width modulation |
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| CN101917158A (en) * | 2010-06-09 | 2010-12-15 | 中国科学院电工研究所 | Dead-zone compensation method for voltage source inverter |
| CN101964592A (en) * | 2010-10-26 | 2011-02-02 | 上海贝思特电气有限公司 | Method for compensating dead area of universal frequency transformer |
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Address after: 710021 export processing zone, No. twelve, 1 road, Fengcheng, Shaanxi, Xi'an Patentee after: Longteng Semiconductor Co.,Ltd. Address before: 710021 export processing zone, No. twelve, 1 road, Fengcheng, Shaanxi, Xi'an Patentee before: LONTEN SEMICONDUCTOR Co.,Ltd. Address after: 710021 export processing zone, No. twelve, 1 road, Fengcheng, Shaanxi, Xi'an Patentee after: LONTEN SEMICONDUCTOR Co.,Ltd. Address before: 710021 export processing zone, No. twelve, 1 road, Fengcheng, Shaanxi, Xi'an Patentee before: XI'AN LONTEN RENEWABLE ENERGY TECHNOLOGY Inc. |