CN103595228A - Digital control method and system for IGBT - Google Patents
Digital control method and system for IGBT Download PDFInfo
- Publication number
- CN103595228A CN103595228A CN201310593384.8A CN201310593384A CN103595228A CN 103595228 A CN103595228 A CN 103595228A CN 201310593384 A CN201310593384 A CN 201310593384A CN 103595228 A CN103595228 A CN 103595228A
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- igbt
- controller
- hysteresis
- drive unit
- current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1563—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators without using an external clock
Abstract
The invention provides a digital control method and system for an IGBT. The method includes the following steps that S1, a controller respectively obtains an inductive current iL(t), an output current io(t) and output voltage vo(t) in a hysteresis current circuit and outputs a current expected value Io(t) through calculation according to an output voltage preset value Ve, the io(t) and the vo(t); S2, the hysteresis width delta I is set to be equal to k* Io(t) through the controller, wherein k is an adjusting factor; S3, the controller informs a driving device of the iL(t), the Io(t) and the delta I, and the driving device controls the IGBT to be connected or disconnected according to the relation among the iL(t), the Io(t) and the delta I.
Description
Technical field
The present invention relates to a kind of control method, relate in particular to digital control method and the system of a kind of IGBT (igbt).
Background technology
IGBT (igbt) is New Type Power Devices, it has gathered the two-fold advantage of power MOSFET (metal-oxide layer-semiconductor-field-effect transistor) with bipolar device, have that input impedance is high, voltage control, input driving power consumption is low, conducting resistance is little, control circuit is simple, high pressure resistant, bear the characteristics such as current capacity is large, switching speed is fast, in fields such as alternating current machine, frequency converter, Switching Power Supply, lighting circuit, Traction Drives, be widely applied.
Along with the occasion of IGBT module application is more and more extensive, also more and more about the control method of IGBT module.Because IGBT only works in conducting or cut-off mode, be therefore particularly suitable for digital control and drive.In actual applications, even if analog pid (ratio, integration, differential are controlled) closed loop also must be converted to digital level by final control output.Therefore,, in the control of IGBT, adopt digital control technology to be obviously better than analog control technique.
For IGBT, how to control the core that its switch is whole control system.Conventional control strategy is to adopt voltage mode to control at present, but due to the impact that is subject to electric capacity in circuit or inductance parasitic resistance and changes, make the control method of voltage mode slower for the dynamic response of input voltage variation, this will cause whole circuit control system precision lower.Meanwhile, the switching frequency of IGBT is also subject to the impact of dead resistance ESR and the inductance of electric capacity: due to the difference of temperature and manufacturing process, cause ESR and equivalent inductance ESL to have larger tolerance, thereby IGBT frequency is changed in a wider scope; And when ESR increases, IGBT switching frequency also will increase thereupon, so not only cause IGBT loss to become large, also reduced system effectiveness.
In view of the foregoing, need to design digital control method and the system of a kind of IGBT, utilize digitial controller to realize the intellectuality that IGBT starts and turn-offs, to solve the slower problem of dynamic response, improve system response time, can further improve the reliability and stability of system simultaneously.
Summary of the invention
The digital control method that the invention provides a kind of IGBT, comprises the following steps:
S1, controller obtain respectively the inductive current i in hysteresis current circuit
l(t), output current i
oand output voltage v (t)
o(t), and according to output voltage preset value Ve, and described i
oand v (t)
o(t), calculate output current desired value I
o(t);
S2, described controller arrange hysteresis band Δ I=kI
o(t), wherein k is adjustment factor;
S3, described controller are by i
l(t), I
o(t) and Δ I notice drive unit, described drive unit is according to described i
l(t), I
o(t) and the relation of Δ I, control conducting or the cut-off of IGBT.
Preferably, in described step S3, drive unit compares respectively i
land I (t)
o(t)-0.5 Δ I and I
o(t) relation of+0.5 Δ I is controlled conducting or the cut-off of IGBT: work as i
l(t)≤I
o(t) during-0.5 Δ I, IGBT conducting; i
l(t)>=I
o(t) during+0.5 Δ I, IGBT cut-off; Work as I
o(t)-0.5 Δ I < i
l(t) < I
o(t) during+0.5 Δ I, conducting or cut-off state before IGBT keeps.
Preferably, between described step S2 and step S3, also comprise: default output current threshold value, controller compares i in real time
o(t) with output current threshold value, as described i
o(t), while being less than output current threshold value, controller arranges adjusts factor k≤1.
Preferably, the computing formula of described output current desired value is I
o(t)=Ve i
o(t)/v
o(t).
The present invention also provides the numerical control system of a kind of IGBT, comprises hysteresis current circuit, controller and drive unit, and described controller connects respectively described hysteresis current circuit and drive unit, and described drive unit connects described hysteresis current circuit.Described controller, for obtaining respectively the inductive current i of hysteresis current circuit
l(t), output current i
oand output voltage v (t)
o(t), and according to output voltage preset value Ve, and described i
oand v (t)
o(t), calculate output current desired value I
o(t), also for hysteresis band Δ I=k I is set
o(t).Described drive unit, for according to described i
l(t), I
o(t) and the relation of Δ I, control conducting or the cut-off of IGBT in hysteresis current circuit.
According to the digital control method of IGBT provided by the invention and system, the hysteresis band of electric current is set in Hysteresis Current circuit, and according to the variation upper lower limit value of electric current, controls conducting and the cut-off of IGBT, realized the digitlization that IGBT controls.Thereby avoided because the response hysteresis phenomenon that electric capacity or inductance self-characteristic cause, when having strengthened load response speed, can improve system control precision again.And by the setting to hysteresis band, the switching frequency of IGBT is controlled in proper range, thereby reduced the power loss of high frequency power switching circuit.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is traditional stagnant loop voltag control model circuit structure schematic diagram;
Fig. 2 is traditional stagnant loop voltag control model work wave schematic diagram;
Fig. 3 is the digital control method flow chart of the IGBT that provides of preferred embodiment of the present invention;
Fig. 4 is the circuit structure schematic diagram of the digital control method of IGBT provided by the invention;
Fig. 5 is the hysteresis current control model work wave mode schematic diagram of the digital control method of IGBT provided by the invention;
Fig. 6 is the numerical control system structural representation of the IGBT that provides of preferred embodiment of the present invention.
Embodiment
For a better understanding of the present invention, first IGBT voltage mode control of the prior art is described.
Shown in Fig. 1, being traditional stagnant loop voltag control model circuit structure schematic diagram, is traditional stagnant loop voltag control model work wave schematic diagram shown in Fig. 2.
In conjunction with Fig. 1 and Fig. 2, when the circuit of stagnant loop voltag control model is during in stable state, if IGBT conducting, the current i in inductance L
llinear increasing, V
oincrease.If output voltage average value is default reference voltage Vref, work as V
owhile equaling stagnant ring upper limit Vref+Vh, IGBT cut-off.Inductive current i now
llinearity reduces, V
oreduce.Work as V
owhile being reduced to stagnant ring lower limit Vref-Vh, IGBT conducting.
Above-mentioned by voltage-controlled IGBT mode of operation in, owing to being subject to the impact of the factors such as inductance and electric capacity, slower to the response of the variation of input voltage and output loading; And because the excursion of the frequency of IGBT is larger, easily cause IGBT loss excessive.
Hereinafter with reference to accompanying drawing, also describe the present invention in detail in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
Fig. 3 is the digital control method flow chart of the IGBT that provides of preferred embodiment of the present invention, and Fig. 4 is the circuit structure schematic diagram of the digital control method of IGBT provided by the invention.
As shown in Figure 3, the digital control method of the IGBT that preferred embodiment of the present invention provides comprises step S1～S3.
Step S1: controller obtains respectively the inductive current i in hysteresis current circuit
l(t), output current i
oand output voltage v (t)
o(t), and according to output voltage preset value Ve, and described i
oand v (t)
o(t), calculate output current desired value I
o(t).
As shown in Figure 4, in the circuit structure schematic diagram of the digital control method of IGBT provided by the invention, controller connects respectively hysteresis current circuit and drive unit, and drive unit connects hysteresis current circuit.
In the present embodiment, output current desired value I
o(t) computing formula is I
o(t)=Ve i
o(t)/v
o(t).
Step S2: described controller arranges hysteresis band Δ I=kI
o(t), wherein k is adjustment factor.
In this, described k is positive number, and dynamically adjusts its actual numerical value by controller.
Step S3: described controller is by i
l(t), I
o(t) and Δ I notice drive unit, described drive unit is according to described i
l(t), I
o(t) and the relation of Δ I, control conducting or the cut-off of IGBT.
Particularly, the mode that described drive unit is controlled described IGBT conducting or cut-off is to compare respectively i
land I (t)
o(t)-0.5 Δ I and I
o(t) relation of+0.5 Δ I: work as i
l(t)≤I
o(t) during-0.5 Δ I, IGBT conducting; i
l(t)>=I
o(t) during+0.5 Δ I, IGBT cut-off; Work as I
o(t)-0.5 Δ I < i
l(t) < I
o(t) during+0.5 Δ I, conducting or cut-off state before IGBT keeps.
In the present embodiment, consider that load is lighter, i.e. i
o(t) hour, likely there is I
o(t) situation of-0.5 Δ I<0, has preset output current threshold value.Described output current threshold value can be set according to actual conditions by user, to this present invention and be not construed as limiting.Controller compares i in real time
o(t) with output current threshold value, as described i
o(t), while being less than output current threshold value, described controller arranges adjusts factor k≤1.
It shown in Fig. 5, is the hysteresis current control model work wave mode schematic diagram of the digital control method of IGBT provided by the invention.
As shown in Figure 5, the current i in inductance L
l(t) be linear change, if i
l(t) from I
o(t)-0.5 Δ I is increased to I
o(t) time of expending during+0.5 Δ I is t1, i
l(t) from I
o(t)+0.5 Δ I drops to I
o(t) time of expending during-0.5 Δ I is t2, and t1 equates with t2.At t1+t2, in the time, can learn the average current i on inductance so
l(t) equal I
o(t).In the curent change process of long period, can think current i
l(t) be stable at I
o(t), thus obtain stable output voltage V e=I
o(t) R
l(t).
It shown in Fig. 6, is the numerical control system structural representation of the IGBT that provides of preferred embodiment of the present invention.As shown in Figure 6, the numerical control system of the IGBT that preferred embodiment of the present invention provides comprises hysteresis current circuit 1, controller 2 and drive unit 3, described controller 2 connects respectively described hysteresis current circuit 1 and drive unit 3, and described drive unit 3 connects described hysteresis current circuit 1.Described controller 2, for obtaining respectively the inductive current i of hysteresis current circuit 1
l(t), output current i
oand output voltage v (t)
o(t), and according to output voltage preset value Ve, and described i
oand v (t)
o(t), calculate output current desired value I
o(t), also for hysteresis band Δ I=k I is set
o(t).Described drive unit 3, for according to described i
l(t), I
o(t) and the relation of Δ I, control conducting or the cut-off of IGBT in hysteresis current circuit 1.About the operating process of said system with described in said method, therefore repeat no more in this.
In sum, according to the digital control method of IGBT provided by the invention and system, by drive unit, according to the linear change of electric current, controlled conducting and the cut-off of IGBT, realized the intellectuality that IGBT controls.Therefore, avoid the problem of the voltage response sluggishness that electric capacity or inductance cause, improved system control precision, strengthened load response speed.Simultaneously, dynamic control by controller to hysteresis band, the switching frequency of IGBT can be controlled in rational scope, greatly reduce the power loss of IGBT under on off state, thereby guarantee accuracy, the reliability and stability of IGBT control system.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to embodiment illustrated herein, but will meet the widest scope consistent with principle disclosed herein and features of novelty.Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to embodiment illustrated herein, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a digital control method of IGBT, is characterized in that, comprises the following steps:
S1, controller obtain respectively the inductive current i in hysteresis current circuit
l(t), output current i
oand output voltage v (t)
o(t), and according to output voltage preset value Ve, and described i
oand v (t)
o(t), calculate output current desired value I
o(t);
S2, described controller arrange hysteresis band Δ I=kI
o(t), wherein k is adjustment factor;
S3, described controller are by i
l(t), I
o(t) and Δ I notice drive unit, described drive unit is according to described i
l(t), I
o(t) and the relation of Δ I, control conducting or the cut-off of IGBT.
2. method according to claim 1, is characterized in that, in described step S3, drive unit compares respectively i
land I (t)
o(t)-0.5 Δ I and I
o(t) relation of+0.5 Δ I is controlled conducting or the cut-off of IGBT: work as i
l(t)≤I
o(t) during-0.5 Δ I, IGBT conducting; i
l(t)>=I
o(t) during+0.5 Δ I, IGBT cut-off; Work as I
o(t)-0.5 Δ I < i
l(t) < I
o(t) during+0.5 Δ I, conducting or cut-off state before IGBT keeps.
3. method according to claim 1, is characterized in that, between described step S2 and step S3, also comprises: default output current threshold value, controller compares i in real time
o(t) with output current threshold value, as described i
o(t), while being less than output current threshold value, controller arranges adjusts factor k≤1.
4. method according to claim 1, is characterized in that, the computing formula of described output current desired value is I
o(t)=Vei
o(t)/v
o(t).
5. a numerical control system of IGBT, is characterized in that, comprises hysteresis current circuit, controller and drive unit, and described controller connects respectively described hysteresis current circuit and drive unit, and described drive unit connects described hysteresis current circuit,
Described controller, for obtaining respectively the inductive current i of hysteresis current circuit
l(t), output current i
oand output voltage v (t)
o(t), and according to output voltage preset value Ve, and described i
oand v (t)
o(t), calculate output current desired value I
o(t), also for hysteresis band Δ I=kI is set
o(t);
Described drive unit, for according to described i
l(t), I
o(t) and the relation of Δ I, control conducting or the cut-off of IGBT in hysteresis current circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310593384.8A CN103595228A (en) | 2013-11-20 | 2013-11-20 | Digital control method and system for IGBT |
| PCT/CN2014/082617 WO2015074430A1 (en) | 2013-11-20 | 2014-07-21 | Digital control method and system for igbt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310593384.8A CN103595228A (en) | 2013-11-20 | 2013-11-20 | Digital control method and system for IGBT |
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| Publication Number | Publication Date |
|---|---|
| CN103595228A true CN103595228A (en) | 2014-02-19 |
Family
ID=50085249
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|---|---|---|---|
| CN201310593384.8A Pending CN103595228A (en) | 2013-11-20 | 2013-11-20 | Digital control method and system for IGBT |
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| WO (1) | WO2015074430A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015074430A1 (en) * | 2013-11-20 | 2015-05-28 | 西安永电电气有限责任公司 | Digital control method and system for igbt |
| CN105790553A (en) * | 2016-03-14 | 2016-07-20 | 上海电机学院 | IGBT intelligent drive unit |
| CN106300926A (en) * | 2016-08-31 | 2017-01-04 | 杰华特微电子（张家港）有限公司 | The control circuit of on-off circuit and control method, switching power circuit |
| CN106300972A (en) * | 2016-08-31 | 2017-01-04 | 杰华特微电子（张家港）有限公司 | The control method of a kind of on-off circuit, control circuit and switch circuit devices |
| CN108259027A (en) * | 2016-12-28 | 2018-07-06 | 北京天诚同创电气有限公司 | The driver and driving method of the gate drive voltage of Serial regulation IGBT |
| CN106130321B (en) * | 2016-08-31 | 2018-09-14 | 杰华特微电子（张家港）有限公司 | A kind of control method of switching circuit, control circuit and switch circuit devices |
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| CN101494424A (en) * | 2008-08-05 | 2009-07-29 | 深圳市盛弘电气有限公司 | Control method for tri-level inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103595228A (en) * | 2013-11-20 | 2014-02-19 | 西安永电电气有限责任公司 | Digital control method and system for IGBT |
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2013
- 2013-11-20 CN CN201310593384.8A patent/CN103595228A/en active Pending
-
2014
- 2014-07-21 WO PCT/CN2014/082617 patent/WO2015074430A1/en active Application Filing
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| CN101494424A (en) * | 2008-08-05 | 2009-07-29 | 深圳市盛弘电气有限公司 | Control method for tri-level inverter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015074430A1 (en) * | 2013-11-20 | 2015-05-28 | 西安永电电气有限责任公司 | Digital control method and system for igbt |
| CN105790553A (en) * | 2016-03-14 | 2016-07-20 | 上海电机学院 | IGBT intelligent drive unit |
| CN106300926A (en) * | 2016-08-31 | 2017-01-04 | 杰华特微电子（张家港）有限公司 | The control circuit of on-off circuit and control method, switching power circuit |
| CN106300972A (en) * | 2016-08-31 | 2017-01-04 | 杰华特微电子（张家港）有限公司 | The control method of a kind of on-off circuit, control circuit and switch circuit devices |
| CN106300926B (en) * | 2016-08-31 | 2018-08-28 | 杰华特微电子（张家港）有限公司 | The control circuit and control method of switching circuit, switching power circuit |
| CN106130321B (en) * | 2016-08-31 | 2018-09-14 | 杰华特微电子（张家港）有限公司 | A kind of control method of switching circuit, control circuit and switch circuit devices |
| CN108259027A (en) * | 2016-12-28 | 2018-07-06 | 北京天诚同创电气有限公司 | The driver and driving method of the gate drive voltage of Serial regulation IGBT |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015074430A1 (en) | 2015-05-28 |
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