CN205265240U - Three level converter and drive circuit based on vce detects - Google Patents
Three level converter and drive circuit based on vce detects Download PDFInfo
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- CN205265240U CN205265240U CN201520951187.3U CN201520951187U CN205265240U CN 205265240 U CN205265240 U CN 205265240U CN 201520951187 U CN201520951187 U CN 201520951187U CN 205265240 U CN205265240 U CN 205265240U
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- current transformer
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- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
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Abstract
The utility model relates to a three level converter and drive circuit based on vce detects, including DSP, include still that every IGBT corresponds the vce detection loop who sets up, every vce detection loop includes all that is connected the output of reporting an emergency and asking for help or increased vigilance DSP, that be used for the output state of reporting an emergency and asking for help or increased vigilance. Every IGBT corresponds a vce detection loop, and when one of them IGBT goes wrong, fault -signal is sent on the return circuit to the correspondence, blockades whole pulses, can be clearly and definitely breaks down to certain IGBT of certain looks.
Description
Technical field
The utility model relates to a kind of three-level current transformer and drive circuit thereof detecting based on Vce.
Background technology
For the driving in current transformer; connecting control loop and major loop; its main function is that control signal is amplified to a certain degree; meet the normal work requirements of power electronic devices; be an important link of current transformer but drive protection part, the performance of device is had a great impact.
In converter device, the tri-level inversion circuit generation load short circuits that main switching component IGBT forms or when straight-through, busbar voltage is directly added in C, the E end of IGBT, the electric current flowing through on IGBT colelctor electrode sharply increases, now need immediately to cut off and drive signal, locking pulse, security, the reliability of guaranteeing device are had to important impact.
The short circuit in the situation that, can bear the overcurrent time shorter for IGBT, be roughly 10us left and right. If cannot detect fault locking pulse in IGBT can bear time of overcurrent, so directly can affect the normal operation of device, and may occur that the phenomenon of device failure occurs.
In prior art, utilize Hall element to detect electric current; A, B, C respectively all have a current Hall to gather current signal mutually; the current signal collecting is after discharge circuit; be sent to DSP; DSP contrasts current current peak; in the time that the current peak of a certain phase exceeds the protection threshold value setting; there is the situation of overcurrent in the system of being judged to be, locking pulse immediately quits work system.
The shortcoming of such scheme is: when certain occurs overcurrent mutually, i.e. all pulses all block, and protected the reliability of whole device, but in indefinite three level topologys, problem have appearred in which IGBT of this phase, causes system to break down.
Utility model content
The purpose of this utility model is to provide a kind of drive circuit of three-level current transformer detecting based on Vce, in order to solve in prior art cannot clear failure phase problem.
For achieving the above object, scheme of the present utility model comprises:
The drive circuit of three-level current transformer detecting based on Vce, comprises DSP, and each IGBT is equipped with a Vce and detects loop, Vce detect loop comprise one connect DSP, for the alarm output of outputting alarm state.
Further, described detection loop comprises ACPL-332J, the DESAT pin senses Vce of ACPL-332J.
Further, the Fault pin that described alarm output is ACPL-332J, Fault pin connects DSP.
Further, the output of the Vout pin of ACPL-332J drives and connects IGBT.
Simultaneously, the utility model also provides a kind of three-level current transformer detecting based on Vce, its drive circuit comprises DSP, it is characterized in that, also comprise that the corresponding Vce arranging of each IGBT detects loop, each Vce detect loop include one connect DSP, for the alarm output of outputting alarm state.
Described detection loop comprises ACPL-332J, the DESAT pin senses Vce of ACPL-332J.
The Fault pin that described alarm output is ACPL-332J, Fault pin connects DSP.
The Vout pin output of ACPL-332J drives and connects IGBT.
In the utility model, the corresponding Vce of each IGBT detects loop, in the time that one of them IGBT goes wrong, on corresponding loop, send fault-signal, blocks whole pulses, can clearly break down to certain IGBT of certain phase.
Brief description of the drawings
Fig. 1 is three-level current transformer circuit topology figure;
Fig. 2 is the given and Vce test section of the driving signal of drive plate.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in more detail.
Three-level current transformer embodiment
As shown in Figure 1, every have four IGBT to three level topologys mutually, and in the present embodiment, four IGBT complete driving by two drive plates, and wherein a drive plate independently drives signal to form by two-way.
The drive plate of current transformer comprises two parts: a part is that Switching Power Supply, a part are the given and Vce test section that drives signal.
For Switching Power Supply part, be mainly that the chip part of Switching Power Supply is used UC2845B, by the output of Switching Power Supply, obtains the malleation of 15V and the negative pressure of 9V in order to drive IGBT that turning-on voltage and the shutoff voltage of gate pole are provided. This partial circuit is prior art, is not therefore specifically addressed.
Drive the given and Vce test section of signal, this part core devices is ACPL-332J, and this optocoupler has 2.5A output current driving force, integrated a lot of functional modules, and as Vce detects, the soft shutoff of IGBT and active Miller clamper etc., it mainly possesses:
1) directly use GaAspLED to drive, be directly coupled to power output stage, saved buffer;
2) lower transmission delay, in whole temperature range, the maximum transmission delay time is 250ns;
3) lower pulse-width distortion, maximum pulse-width distortion is 100ns;
4) integrated active Miller clamper function.
This part realizes two aspects: first aspect is drive signal given, and the driving signal that DSP sends is transferred to the ANODE end of ACPL-332J, through the isolation of optocoupler, by the output of VOUT end, drives thus IGBT. Second aspect is that Vce detects, and the VOUT pin of ACPL-332J is providing driving signal for IGBT. ACPL-332J is monitoring the Vce voltage of IGBT simultaneously, and in the time that IGBT does not have problems, the Fault pin of ACPL-332J is high level. If have short circuit or very large electric current to flow through the situation of IGBT, IGBT will move back saturated, Vce voltage is drawn high, in the time that DESAT pin senses arrives Vce magnitude of voltage higher than 6.5V, Vout output level reduces gradually, starts soft shutoff IGBT, and the saltus step of Fault pin level is low simultaneously, this low level transfers to DSP, locking pulse.
About drive circuit embodiment, owing to being described in detail in above embodiment, therefore repeat no more.
More than provided the detailed description of the invention that the utility model relates to, but the utility model is not limited to described embodiment. Under the thinking providing at the utility model; adopt the mode of easily expecting to those skilled in the art that the technological means in above-described embodiment is converted, replaces, revised; and the relevant art means utility model object basic identical, that realize in effect and the utility model of playing is also basic identical; the technical scheme forming is like this finely tuned formation to above-described embodiment, and this technical scheme still falls in protection domain of the present utility model.
Claims (8)
1. a drive circuit for the three-level current transformer detecting based on Vce, comprises DSP, and its feature existsIn, also comprising that the corresponding Vce arranging of each IGBT detects loop, each Vce detects loop and includes oneIndividual connection DSP, for the alarm output of outputting alarm state.
2. the drive circuit of a kind of three-level current transformer detecting based on Vce according to claim 1,It is characterized in that, described detection loop comprises ACPL-332J, the DESAT pin senses of ACPL-332JVce。
3. the drive circuit of a kind of three-level current transformer detecting based on Vce according to claim 2,It is characterized in that, the Fault pin that described alarm output is ACPL-332J, Fault pin connects DSP.
4. the drive circuit of a kind of three-level current transformer detecting based on Vce according to claim 3,It is characterized in that, the Vout pin output of ACPL-332J drives and connects IGBT.
5. the three-level current transformer detecting based on Vce, its drive circuit comprises DSP, its feature existsIn, also comprising that the corresponding Vce arranging of each IGBT detects loop, each Vce detects loop and includes oneIndividual connection DSP, for the alarm output of outputting alarm state.
6. a kind of three-level current transformer detecting based on Vce according to claim 5, is characterized in that,Described detection loop comprises ACPL-332J, the DESAT pin senses Vce of ACPL-332J.
7. a kind of three-level current transformer detecting based on Vce according to claim 6, is characterized in that,The Fault pin that described alarm output is ACPL-332J, Fault pin connects DSP.
8. a kind of three-level current transformer detecting based on Vce according to claim 7, is characterized in that,The Vout pin output of ACPL-332J drives and connects IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520951187.3U CN205265240U (en) | 2015-11-25 | 2015-11-25 | Three level converter and drive circuit based on vce detects |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520951187.3U CN205265240U (en) | 2015-11-25 | 2015-11-25 | Three level converter and drive circuit based on vce detects |
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| CN205265240U true CN205265240U (en) | 2016-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520951187.3U Active CN205265240U (en) | 2015-11-25 | 2015-11-25 | Three level converter and drive circuit based on vce detects |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196384A (en) * | 2019-07-01 | 2019-09-03 | 深圳市英威腾电气股份有限公司 | A kind of IGBT device failure real-time detection circuit |
-
2015
- 2015-11-25 CN CN201520951187.3U patent/CN205265240U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196384A (en) * | 2019-07-01 | 2019-09-03 | 深圳市英威腾电气股份有限公司 | A kind of IGBT device failure real-time detection circuit |
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| GR01 | Patent grant |