CN203596737U - Three-level inverter power unit with voltage-sharing protection function - Google Patents
Three-level inverter power unit with voltage-sharing protection function Download PDFInfo
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- CN203596737U CN203596737U CN201320704717.5U CN201320704717U CN203596737U CN 203596737 U CN203596737 U CN 203596737U CN 201320704717 U CN201320704717 U CN 201320704717U CN 203596737 U CN203596737 U CN 203596737U
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Abstract
Provided is a three-level inverter power unit with a voltage-sharing protection function. The three-level inverter power unit comprises four IGBT tubes which are connected in series, wherein, the connection point of the first IGBT tube and the second IGBT tube is a point A, and the connection point of the third IGBT tube and the fourth IGBT tube is a point B. The three-level inverter power unit also comprises a neutral point O, a first diode is connected between the neutral point O and the point A and a second diode is connected between the neutral point O and the point B. The three-level inverter power unit also comprises a clamp resistor, the clamp resistor is connected with the first diode and the second diode in parallel. In the power unit, the IGBT voltage-sharing protection resistor is added, the problem of uneven voltage distribution of two IGBTs in series is solved effectively, the probability of IGBT damage caused by uneven voltage distribution is lowered, and the fault probability of the inverter is lowered.
Description
Technical field
The utility model relates to a kind of transducer power unit, specifically relates to a kind of three-level converter power cell with voltage equalizing protection function.
Background technology
The principle sketch of neutral-point-clamped formula three-level converter as shown in Figure 1, rectifying part is made up of 3 power cells (U phase, V phase and W phase), convert three-phase alternating current to direct current by rectification algorithm, and carry out filtering by two electric capacity of DC link, in the middle of electric capacity, draw neutral point, be connected with inverter power unit with rectification, thereby make DC link have three level, Converting Unit converts direct current to three-phase alternating current more afterwards.
Wherein the P point voltage value of schematic diagram is+Udc/2; O point voltage value is 0V; N point voltage value is-Udc/2.
As shown in Figure 2, its control logic has three kinds to traditional power cell: the one, V1 and V2 are open-minded, and all the other turn-off, and now exchanges to hold with P to hold by IGBT conducting, and old friend flows end output voltage and is+Udc/2; The 2nd, V3 and V4 are open-minded, and all the other turn-off, and now exchange to hold with N to hold by IGBT conducting, and old friend flows end output voltage and is-Udc/2; The 3rd, V2 and V3 are open-minded, and all the other turn-off, and now exchange end by VD1 and V2(or VD2 and V3) and the conducting of O end, it is O that old friend flows end output voltage.In the time that power cell is in the first and the second situation, there is the IGBT of two series connection to bear the voltage U dc on DC bus.Because each IGBT characteristic is not quite identical, can cause unbalanced-voltage-division, affect IGBT operation characteristic steady in a long-term.
Summary of the invention
In order to address the above problem; our company designs a kind of IGBT voltage equalizing protection circuit on the basis of traditional power cell; when power cell is operated in the first and the second situation lower time, can make the IGBT of two series connection all press unanimously, improve the long-term working stability of IGBT.
For addressing the above problem, the utility model by the following technical solutions:
A kind of three-level converter power cell with voltage equalizing protection function, it comprises four IGBT pipes that are cascaded, wherein the tie point between an IGBT pipe and the 2nd IGBT pipe is A point, and wherein the tie point between the 3rd IGBT pipe and the 4th IGBT pipe is B point; It also comprises a neutral O point, between neutral O point and A point, is connected the first diode, between neutral O point and B point, is connected the second diode, and it also comprises a clamp resistance, and described clamp resistance is connected with the first diode, the second diodes in parallel.
Adopt the utility model of technique scheme; in power cell, add IGBT voltage equalizing protection resistance and efficiently solve the problem of two IGBT unbalanced-voltage-divisions of series connection; reduce IGBT because unbalanced-voltage-division causes the probability of damage, reduced the probability that frequency converter breaks down.
Accompanying drawing explanation
Fig. 1 is three-level converter principle sketch.
Fig. 2 is traditional power cell.
Fig. 3 is the power cell after improving.
Embodiment
As shown in Figure 3, a kind of three-level converter power cell with voltage equalizing protection function, it comprises four IGBT pipes that are cascaded, and wherein the tie point between an IGBT pipe V1 and the 2nd IGBT pipe V2 is A point, and wherein the tie point between the 3rd IGBT pipe V3 and the 4th IGBT pipe V4 is B point; It also comprises a neutral O point, between neutral O point and A point, be connected the first diode VD1, between neutral O point and B point, be connected the second diode VD2, it also comprises a clamp resistance R1, and described clamp resistance R1 and the first diode VD1, the second diode VD2 are connected in parallel.
The utility model is many clamp resistance R1 compared with traditional power cell, as shown in Figure 3.When power cell is operated in the first situation, the one IGBT pipe V1 and the 2nd IGBT pipe V2 are open-minded, when the 3rd IGBT pipe V3 and the 4th IGBT pipe V4 turn-off, P point voltage is+Udc/2, N point voltage is-Udc/2 that the 3rd IGBT pipe V3 and the 4th IGBT pipe V4 of series connection bear the voltage U dc on DC bus.Because O point voltage is 0V, A point voltage is+Udc/2, so can form path (as shown in single arrow in Fig. 3) by clamp resistance R1 and the 2nd IGBT pipe V2 between A and O point, thereby B point voltage is become and O point equipotential by clamper by the 2nd IGBT pipe V2, be 0V.Such the 3rd IGBT pipe V3 and the 4th IGBT pipe V4 are effectively all pressed, and all bear the voltage of Udc/2.
When power cell is operated in the second situation, the 3rd IGBT pipe V3 and the 4th IGBT pipe V4 are open-minded, when the one IGBT pipe V1 and the 2nd IGBT pipe V2 turn-off, P point voltage is+Udc/2, O point voltage is-Udc/2 that the one IGBT pipe V1 and the 2nd IGBT pipe V2 of series connection bear the voltage U dc on DC bus.Because O point voltage is 0V, B point voltage is+Udc/2, thus between O and B point, form path (as shown in double-head arrow in Fig. 3) by clamper R1 and the first diode VD1, thus A point voltage is become and O point equipotential by clamper by the first diode VD1, be 0V.Such IGBT pipe V1 and the 2nd IGBT pipe V2 are effectively all pressed, and all bear the voltage of Udc/2.
As mentioned above, after increase IGBT voltage equalizing protection circuit, can effectively guarantee that two IGBT dividing potential drops of series connection are consistent, prevent that the IGBT that IGBT unbalanced-voltage-division causes from damaging.
Claims (1)
1. one kind has the three-level converter power cell of voltage equalizing protection function, it comprises four IGBT pipes that are cascaded, wherein the tie point between an IGBT pipe (V1) and the 2nd IGBT pipe (V2) is A point, and wherein the tie point between the 3rd IGBT pipe (V3) and the 4th IGBT pipe (V4) is B point; It also comprises a neutral O point, between neutral O point and A point, be connected the first diode (VD1), between neutral O point and B point, be connected the second diode (VD2), it is characterized in that: it also comprises a clamp resistance (R1), described clamp resistance (R1) is connected in parallel with the first diode (VD1), the second diode (VD2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320704717.5U CN203596737U (en) | 2013-11-11 | 2013-11-11 | Three-level inverter power unit with voltage-sharing protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320704717.5U CN203596737U (en) | 2013-11-11 | 2013-11-11 | Three-level inverter power unit with voltage-sharing protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203596737U true CN203596737U (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320704717.5U Expired - Fee Related CN203596737U (en) | 2013-11-11 | 2013-11-11 | Three-level inverter power unit with voltage-sharing protection function |
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| CN (1) | CN203596737U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592003A (en) * | 2017-10-10 | 2018-01-16 | 北京东标电子有限公司 | A kind of three-level converter midpoint static state clamper equalizer circuit |
-
2013
- 2013-11-11 CN CN201320704717.5U patent/CN203596737U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592003A (en) * | 2017-10-10 | 2018-01-16 | 北京东标电子有限公司 | A kind of three-level converter midpoint static state clamper equalizer circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140514 Termination date: 20141111 |
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| EXPY | Termination of patent right or utility model |