CN105207452A - IGBT drive circuit - Google Patents
IGBT drive circuit Download PDFInfo
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- CN105207452A CN105207452A CN201510583125.6A CN201510583125A CN105207452A CN 105207452 A CN105207452 A CN 105207452A CN 201510583125 A CN201510583125 A CN 201510583125A CN 105207452 A CN105207452 A CN 105207452A
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Abstract
The invention relates to an IGBT drive circuit. The IGBT drive circuit comprises a signal generation circuit used for generating a switch signal and further comprises a current sensor used for obtaining output current generated after an IGBT is switched on, and the current sensor is connected with the signal generation circuit through a signal comparing and processing circuit. The signal comparing and processing circuit receives the output current transmitted by the current sensor. The signal comparing and processing circuit determines optimal dead time matched with the output current according to an output current value, the determined optimal dead time is transmitted to the signal generation circuit, the signal generation circuit can output the switch signal corresponding to the optimal dead time according to the optimal dead time, and the switch state of the IGBT is controlled by the switch signal. The IGBT drive circuit monitors the output current, the dead time can be adjusted in real time, and output waveform distortion of the IGBT is reduced as much as possible.
Description
Technical field
The present invention relates to a kind of drive circuit, especially a kind of IGBT drive circuit, belong to the technical field that IGBT drives.
Background technology
IGBT has three terminals: grid G, collector electrode C, emitter E, is a kind of voltage mode control device, and it turns on and off is determined by the voltage Vge between grid and emitter.When voltage Vge is for just and when being greater than threshold voltage, IGBT is open-minded, between collector electrode C and emitter E, there iing electric current; Apply when between grid G and emitter E reverse voltage or not making alive time, IGBT turn off, no current between collector electrode C and emitter E.The effect of IGBT drive circuit is exactly the control signal according to control circuit, provides suitable voltage Vge turning on and off to control IGBT, and protects IGBT.
Common IGBT circuit topology has half-bridge, full-bridge, three-phase bridge etc., and in these circuits, the IGBT on same brachium pontis alternately opens and shutoff, realizes the control to electric energy.Because turning on and off of IGBT exists certain time delay, therefore may occur that an IGBT on same brachium pontis does not also turn off and the situation that another has been opened, the short circuit (bridge arm direct pass) between DC bus, fault will be caused.In order to avoid this situation occurs, introduce Dead Time, when namely IGBT turns off, before next IGBT opens, add one section of time delay, allow two IGBT on same brachium pontis all be in off state.
The computing formula of Dead Time is as follows:
For inductive load be:
Wherein, t
deadfor the Dead Time of IGBT, t
d (off) maxfor the maximum turn off delay time of IGBT, t
d (on) minfor the minimum of IGBT opens time delay; t
d (off) max, t
d (on) mindetermined by IGBT itself and its gate resistance.T
pDD (max), t
pDD (min)be maximum transmitting time delay and the minimum transfer time delay of IGBT drive circuit, be determined by the drive circuit of IGBT, r is allowance coefficient, generally gets 1.2 ~ 1.5.
For resistive load be:
Wherein, t
fmaxfor the maximum of IGBT fall time (also becoming downslope time), refer to that collector current drops to the maximum of 10% time used from 90% of rated value.
Obtained by above-mentioned formulae discovery, be added in the Dead Time in control algolithm, be called the controlling dead error time, it opens based on IGBT to consider with when turning off and bridge arm direct pass the most easily occurs, and be multiplied by certain allowance coefficient and obtain.And IGBT opens and turns off required effective Dead Time and be less than the controlling dead error time at every turn.
IGBT drive circuit will possess the large function of drive and protection two, and bridge arm direct pass is the common reason of IGBT fault, and its consequence directly causes the damage of IGBT, and therefore IGBT drive circuit must prevent bridge arm direct pass.Often introduce Dead Time in current IGBT drive circuit and avoid bridge arm direct pass, Dead Time can pass through software simulating, by related algorithm, is exported the PWM waveform adding Dead Time by controller; Also by hardware implementing, time-delay structure is added in circuit.Regardless of which kind of method, its object is all add a bit of time between two IGBT of same brachium pontis open and turn off, and ensures that two IGBT turn off simultaneously.
Introduce after Dead Time, same brachium pontis two IGBT are alternately opening with when turning off, and will there is the operating state simultaneously turned off, this does not meet perfect condition, and this just makes the output voltage of circuit and current waveform there is certain distortion.What turn off is longer during this period of time simultaneously, and output waveform distortion is more serious.And the setting of Dead Time considers according to circuit worst case, eachly in real work open and turn off pulse and may not need Dead Time so of a specified duration, this just brings unnecessary output waveform distortion.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of IGBT drive circuit, it is monitored output current, adjusts Dead Time in real time, reduces the output waveform distortion of IGBT as far as possible.
According to technical scheme provided by the invention, described IGBT drive circuit, comprises the signal generating circuit for generation of switching signal; Also comprise the current sensor for obtaining output current after IGBT conducting, described current sensor compares treatment circuit by signal and is connected with signal generating circuit;
Signal compares the output current for the treatment of circuit received current sensor transmissions, signal compares treatment circuit and determines the optimum dead zone time with described output current adaptation according to described output current value, and by the described optimum dead zone time tranfer determined to signal generating circuit, signal generating circuit can export the switching signal corresponding with the described optimum dead zone time, with the on off state by described switching signal control IGBT according to the optimum dead zone time.
The switching signal that described signal generating circuit exports is carried out isolation through isolation amplification level change-over circuit and is amplified and be carried on IGBT, with the on off state of control IGBT after level conversion.
Advantage of the present invention: the output current being obtained IGBT by current sensor, signal compares treatment circuit and determines the optimum dead zone time according to output current, signal generating circuit can produce adaptive switching signal according to the optimum dead zone time, IGBT circuit is according to the switching signal conducting or shutoff with optimum dead zone time adaptation, thus be the most suitable Dead Time of each alternate selection of same brachium pontis two IGBT, under the prerequisite ensureing circuit safety, reduce the distortion of output voltage current waveform to greatest extent.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 1: introduce Dead Time and can cause the certain distortion of IGBT output current voltage waveform, the longer distortion of Dead Time is with serious; The setting of general drive circuit Dead Time considers according to the poorest condition of work, therefore Dead Time to arrange relative general work situation longer; Suitable Dead Time is relevant with output current.In order to reduce the output waveform distortion of IGBT as far as possible, the present invention includes the signal generating circuit for generation of switching signal; Also comprise the current sensor for obtaining output current after IGBT conducting, described current sensor compares treatment circuit by signal and is connected with signal generating circuit;
Signal compares the output current for the treatment of circuit received current sensor transmissions, signal compares treatment circuit and determines the optimum dead zone time with described output current adaptation according to described output current value, and by the described optimum dead zone time tranfer determined to signal generating circuit, signal generating circuit can export the switching signal corresponding with the described optimum dead zone time, with the on off state by described switching signal control IGBT according to the optimum dead zone time.
Particularly, the switching signal that described signal generating circuit exports is carried out isolation through isolation amplification level change-over circuit and is amplified and be carried on IGBT, with the on off state of control IGBT after level conversion.Isolation amplification level change-over circuit carries out isolation amplification and level conversion to switching signal, can meet IGBT open and the generating positive and negative voltage pulse turning off demand to be formed.In IGBT circuit, two IGBT of same brachium pontis alternately open and shutoff, and after being connected with load, output current is to load.
Signal compares in treatment circuit and is pre-stored with some optimum dead zone time, in one-to-one relationship between described optimum dead zone time and output current, the corresponding relation of output current and optimum dead zone time can be determined according to the relation between IGBT circuit, load, the process specifically determined, known by the art personnel, repeats no more herein.
In the embodiment of the present invention, by the output current of current sensor Real-time Obtaining IGBT circuit, signal compares treatment circuit can obtain an optimum dead zone time in real time according to output current, by optimum dead zone time tranfer to signal generating circuit, the switching signal of signal generating circuit needed for the generation of optimum dead zone time can be made.After IGBT circuit loading the switching signal produced according to the optimum dead zone time, the state opened, turn off of IGBT can be adjusted, reduce the distortion of IGBT circuit output waveform as far as possible.Signal generating circuit can adopt existing conventional equipment, signal generating circuit produces according to the optimum dead zone time and conventional technological means can be adopted to realize with the process of the switching signal of described optimum dead zone time adaptation, specific implementation process, known by the art personnel, repeats no more herein.
During concrete enforcement; except foregoing circuit; further comprises DC/DC insulating power supply to each module for power supply; and the protective circuit such as overvoltage, overcurrent, under-voltage, excess temperature that general IGBT drive circuit possesses; concrete circuit structure carries out selection as required and determines; be specially known by the art personnel, repeat no more herein.
The present invention obtains the output current of IGBT by current sensor, signal compares treatment circuit and determines the optimum dead zone time according to output current, signal generating circuit can produce adaptive switching signal according to the optimum dead zone time, IGBT circuit is according to the switching signal conducting or shutoff with optimum dead zone time adaptation, thus be the most suitable Dead Time of each alternate selection of same brachium pontis two IGBT, under the prerequisite ensureing circuit safety, reduce the distortion of output voltage current waveform to greatest extent.
Claims (2)
1. an IGBT drive circuit, comprises the signal generating circuit for generation of switching signal; It is characterized in that: also comprise the current sensor for obtaining output current after IGBT conducting, described current sensor compares treatment circuit by signal and is connected with signal generating circuit;
Signal compares the output current for the treatment of circuit received current sensor transmissions, signal compares treatment circuit and determines the optimum dead zone time with described output current adaptation according to described output current value, and by the described optimum dead zone time tranfer determined to signal generating circuit, signal generating circuit can export the switching signal corresponding with the described optimum dead zone time, with the on off state by described switching signal control IGBT according to the optimum dead zone time.
2. IGBT drive circuit according to claim 1, is characterized in that: the switching signal that described signal generating circuit exports is carried out isolation through isolation amplification level change-over circuit and amplified and be carried on IGBT, with the on off state of control IGBT after level conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510583125.6A CN105207452A (en) | 2015-09-14 | 2015-09-14 | IGBT drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510583125.6A CN105207452A (en) | 2015-09-14 | 2015-09-14 | IGBT drive circuit |
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| CN105207452A true CN105207452A (en) | 2015-12-30 |
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| CN201510583125.6A Pending CN105207452A (en) | 2015-09-14 | 2015-09-14 | IGBT drive circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107204760A (en) * | 2016-03-17 | 2017-09-26 | 中车株洲电力机车研究所有限公司 | A kind of IGBT drive devices and system |
| CN108233695A (en) * | 2018-02-10 | 2018-06-29 | 广东美的制冷设备有限公司 | The dead time dynamic regulation circuit and air conditioner of IGBT module |
| CN109039049A (en) * | 2018-07-27 | 2018-12-18 | 苏州伟创电气设备技术有限公司 | A kind of frequency converter PWM dead-time detection method |
| CN110311545A (en) * | 2019-07-25 | 2019-10-08 | 电子科技大学 | A kind of dv/dt noise measuring and eliminate circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101006406A (en) * | 2004-07-06 | 2007-07-25 | 国际整流器公司 | Method and apparatus for intelligently setting dead time |
| CN202385058U (en) * | 2011-12-27 | 2012-08-15 | 无锡华润矽科微电子有限公司 | Circuit structure for realizing dead time self-adaptive control in D-type power amplifier |
-
2015
- 2015-09-14 CN CN201510583125.6A patent/CN105207452A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101006406A (en) * | 2004-07-06 | 2007-07-25 | 国际整流器公司 | Method and apparatus for intelligently setting dead time |
| CN202385058U (en) * | 2011-12-27 | 2012-08-15 | 无锡华润矽科微电子有限公司 | Circuit structure for realizing dead time self-adaptive control in D-type power amplifier |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107204760A (en) * | 2016-03-17 | 2017-09-26 | 中车株洲电力机车研究所有限公司 | A kind of IGBT drive devices and system |
| CN108233695A (en) * | 2018-02-10 | 2018-06-29 | 广东美的制冷设备有限公司 | The dead time dynamic regulation circuit and air conditioner of IGBT module |
| CN109039049A (en) * | 2018-07-27 | 2018-12-18 | 苏州伟创电气设备技术有限公司 | A kind of frequency converter PWM dead-time detection method |
| CN110311545A (en) * | 2019-07-25 | 2019-10-08 | 电子科技大学 | A kind of dv/dt noise measuring and eliminate circuit |
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Application publication date: 20151230 |
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| RJ01 | Rejection of invention patent application after publication |