CN106849634A - A kind of bypass circuit - Google Patents
A kind of bypass circuit Download PDFInfo
- Publication number
- CN106849634A CN106849634A CN201710155053.4A CN201710155053A CN106849634A CN 106849634 A CN106849634 A CN 106849634A CN 201710155053 A CN201710155053 A CN 201710155053A CN 106849634 A CN106849634 A CN 106849634A
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- bypass circuit
- full
- output end
- igbt
- controlled switch
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- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
Classifications
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
The present invention provides a kind of bypass circuit, and its exchange outlet side for being connected in parallel on each cascade module, the bypass circuit includes one group of full-controlled switch pipe, and it is configured with drive circuit.Bypass circuit reliable operation of the present invention, bypass changeover are quick, small volume, low in energy consumption.
Description
Technical field
The present invention relates to power module cascade connection technical field, and in particular to a kind of bypass circuit.
Background technology
The application scenario of ac high-voltage is being exported by module-cascade, in order to ensure the normal operation of system, can typically given
Cascade module (alternatively referred to as inverter bridge) parallel connection bypass circuit, when occurring one or several power model failures in cascade module
When, malfunctioning module is bypassed using bypass circuit, it is ensured that other power models continue normal work, so that system operation is not
It is impacted.
The existing bypass circuit for cascade module mainly uses IGCT or mechanical switch (contactor or relay
Device) realize bypass.As shown in figure 1, bypass circuit is by the way of IGCT reverse parallel connection.Specifically, the bypass circuit by
Ac filter circuit 2 and thyristor circuit 3 are constituted.Wherein ac filter circuit 2 includes exchanging output with one of cascade module
Hold the ac filter inductance L of connection, and the RC series circuit in parallel with the two ends of thyristor circuit 3；Thyristor circuit 3 is by two
The IGCT of reverse parallel connection is composed in parallel, its two ends be connected respectively to ac filter inductance L output end and cascade module it is another
One ac output end, each IGCT is required to configure an isolated drive circuit 4.When certain the power mould in cascade module
When block breaks down, the drive circuit of IGCT drives thyristor circuit 3 to begin to turn on, and causes inverter bridge 1 to be bypassed, so
Can ensure that system is normally run.
Above-mentioned bypass scheme must be that thyristor circuit 3 could be realized with ac filter circuit 2.Because, inverter bridge 1
In IGBT switching speed quickly so that the voltage change ratio du/dt of the output port of inverter bridge 1 it is general 3000V/us with
On, and IGCT is general to the tolerance of du/dt in 1000V/us, if it exceeds this value is possible to cause the IGCT do not having
False triggering in the case of driving, so as to cause output short-circuit and IGCT overcurrent damage, it is therefore desirable to defeated in the exchange of inverter bridge 1
Go out to terminate into ac filter inductance L, and mode in the two ends of thyristor circuit 3 parallel connection RC suppresses the du/dt values at IGCT two ends.
In ac filter circuit 2, increase inductance L and electric capacity C can effectively reduce the du/dt values at IGCT two ends.But
It is that electric capacity C values can make loss increase of the consumption on resistance R when increasing so that the efficiency reduction of system；When inductance l values increase
The volume of power model can be increased.In addition, the introducing of LC can cause the concussion of power model output waveform, can be in IGCT negative and positive
Interpolar forms due to voltage spikes, so above-mentioned bypass scheme proposes requirement higher to the voltage endurance capability of IGCT.
The content of the invention
The technical problems to be solved by the invention are directed to the drawbacks described above in the presence of prior art, there is provided one kind work
Reliable, bypass changeover is quick, small volume, bypass circuit low in energy consumption.
Solving the technical scheme that is used of present invention problem is：
The present invention provides a kind of bypass circuit, its exchange outlet side for being connected in parallel on each cascade module, the bypass circuit
Including one group of full-controlled switch pipe, it is configured with drive circuit.
Alternatively, the bypass circuit includes two full-controlled switch pipes of differential concatenation.
Alternatively, two full-controlled switch pipes of the differential concatenation share an isolated drive circuit.
Alternatively, the full-controlled switch pipe be IGBT, and the emitter stage of two IGBT of differential concatenation link together,
Colelctor electrode is connected with two ac output ends of cascade module respectively, grid is connected to the first of same isolated drive circuit and exports
End, the emitter stage of described two IGBT is connected to the second output end of the isolated drive circuit.
Alternatively, the full-controlled switch pipe be IGBT, and the emitter stage of two IGBT of differential concatenation link together,
Colelctor electrode is connected with two ac output ends of cascade module respectively, grid is exported with two the first of isolated drive circuit respectively
End connection, the emitter stage of described two IGBT is connected with the second output end of described two isolated drive circuits respectively.
Alternatively, the full-controlled switch pipe be the enhanced MOSFET of N-channel, and differential concatenation two N-channels enhancing
The source electrode of type MOSFET links together, drain be connected with two ac output ends of cascade module respectively, grid is connected to
First output end of one isolated drive circuit, the source electrode of described two enhanced MOSFET of N-channel is connected to the isolation drive
Second output end of circuit.
Alternatively, the full-controlled switch pipe be the enhanced MOSFET of N-channel, and differential concatenation two N-channels enhancing
The source electrode of type MOSFET links together, drain be connected with two ac output ends of cascade module respectively, grid is respectively with two
The first output end connection of individual isolated drive circuit, the source electrode of described two enhanced MOSFET of N-channel respectively with it is described two
The second output end connection of isolated drive circuit.
Alternatively, the diode for being internally integrated reverse parallel connection of the full-controlled switch pipe, or outside is connected to reversely
Diode in parallel.
Alternatively, the bypass circuit also includes the mechanical switch in parallel with one group of full-controlled switch pipe.
Alternatively, the mechanical switch is relay or contactor.
Beneficial effect：
Bypass circuit of the present invention compared with prior art, can avoid using thyristor circuit as bypass when because
Bear to exceed the du/dt of IGCT tolerance and mislead, so as to cause to exchange output short-circuit and bypass what IGCT was damaged
Problem occurs, and can apply in ac output end voltage change ratio du/dt larger occasion.
Brief description of the drawings
Fig. 1 is the circuit diagram of bypass circuit in the prior art；
Fig. 2 is the circuit diagram of the first bypass circuit provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram of second bypass circuit provided in an embodiment of the present invention；
Fig. 4 is the circuit diagram of the third bypass circuit provided in an embodiment of the present invention；
Fig. 5 is the circuit diagram of the 4th kind of bypass circuit provided in an embodiment of the present invention.
In figure：1- inverter bridges；2- filter circuits；3- thyristor circuits；4- isolated drive circuits；11- grades of gang mould
Block；Two IGBT of 12- differential concatenations；13- isolated drive circuits；Two N-channels of 14- differential concatenations are enhanced
MOSFET；15- mechanical switch.
Specific embodiment
To make those skilled in the art more fully understand technical scheme, with reference to the accompanying drawings and examples to this
Invention is described in further detail.
The embodiment of the present invention provides a kind of bypass circuit, the exchange of its module (such as power model) for being connected in parallel on each cascade
Outlet side, the bypass circuit includes one group of full-controlled switch pipe, and it is configured with drive circuit, to drive each full-controlled switch
The on, off of pipe.It is understood that one group of full-controlled switch pipe is connected in parallel on the exchange outlet side of cascade module.
In cascade module normal work, it is always negative electricity that drive circuit controls the driving voltage of each full-controlled switch pipe
It is flat, so that each full-controlled switch pipe remains off state, and will not be excessive because of ac output end voltage change ratio du/dt
And mislead；When cascade module breaks down, drive circuit controls the driving voltage of each full-controlled switch pipe always for just
Level, so that each full-controlled switch pipe remains open mode, now electric current flows through from bypass circuit, by what is broken down
Module cuts off from system, in order to avoid influence system worked well.
Specifically, the bypass circuit includes two full-controlled switch pipes of differential concatenation.The two differential concatenations it is complete
Control type switching tube can share an isolated drive circuit.
Describe the concrete structure of bypass circuit provided in an embodiment of the present invention in detail with reference to Fig. 2-4.
As shown in Fig. 2 the full-controlled switch pipe can be IGBT (Insulated Gate Bipolar
Transistor, insulated gate bipolar transistor), and the emitter stage of two IGBT12 of differential concatenation link together (formed
Series connection point), colelctor electrode is connected with two ac output ends of cascade module 11 respectively, grid is connected to same isolated drive circuit
13 the first output end, the emitter stage of two IGBT 12 of the differential concatenation is connected to the of the isolated drive circuit 13
Two output ends, in other words, the second output end of the isolated drive circuit 13 is connected to two strings of IGBT 12 of differential concatenation
Connection point.
Wherein, each IGBT can both be internally integrated the diode of reverse parallel connection, also outside can be connected to the two of reverse parallel connection
Pole pipe.
Because two IGBT 12 of differential concatenation share an isolated drive circuit 13, type of drive is simple.Certainly, instead
An isolated drive circuit can be also respectively adopted to two IGBT of series connection.
Specifically, the emitter stage of two IGBT of differential concatenation links together, colelctor electrode is respectively with the two of cascade module
Individual ac output end connection, first output end of the grid respectively with two isolated drive circuits are connected, the hair of described two IGBT
Emitter-base bandgap grading is connected with the second output end of described two isolated drive circuits respectively.
In the case where bypass circuit is constituted by two IGBT of differential concatenation, in cascade module normal work, reversely
The driving voltage Vge of two IGBT of series connection is always negative level, and IGBT device in itself will not be because of ac output end voltage
Rate of change du/dt is excessive and mislead, so this bypass scheme will not be subject to ac output end voltage change ratio du/dt shadow
Ring；When cascade module breaks down, the driving voltage Vge of two IGBT of differential concatenation is changed into positive level so that reversely go here and there
Two IGBT conductings of connection, now electric current flows through from bypass circuit (i.e. two IGBT of differential concatenation), by malfunctioning module from being
Cut away in system, from the normal work without influenceing system.
In order to further reduce the power consumption of bypass circuit, can be in the exchange outlet side parallel connection differential concatenation of cascade module
While two IGBT, then parallel manipulator switch.As shown in figure 3, the bypass circuit also includes two with differential concatenation
The mechanical switch 15 of the parallel connections of IGBT 12, so that when cascade module 11 breaks down, two IGBT12 and the machinery of differential concatenation
The action (closure) simultaneously of switch 15, because two responsivenesses of IGBT 12 of differential concatenation are very fast (in Microsecond grade), and it is mechanical
The action of switch 15 is relatively slow (in Millisecond), so by-pass current first passes through the place branch roads of two IGBT 12 of differential concatenation, treats
Mechanical switch 15 passes through the place branch road of mechanical switch 15 again after closing.The mechanical switch 15 can be relay or contactor.
Additionally, as shown in figure 4, the full-controlled switch pipe can also be the enhanced MOSFET (Metal-Oxide- of N-channel
Semiconductor Field-Effect Transistor, Metal-Oxide Semiconductor field-effect transistor), and reversely string
Connection the enhanced MOSFET 14 of two N-channels source electrode link together (formation series connection point), drain respectively with cascade module 11
The connection of two ac output ends, grid be connected to the first output end of same isolated drive circuit 13, the differential concatenation
The source electrode of two enhanced MOSFET14 of N-channel is connected to the second output end of the isolated drive circuit 13, in other words, described
Second output end of isolated drive circuit 13 is connected to the series connection point of the enhanced MOSFET 14 of two N-channels of differential concatenation.
Wherein, the enhanced MOSFET of each N-channel can both be internally integrated the diode of reverse parallel connection, outside can also be connected to
The diode of reverse parallel connection.
Because the enhanced MOSFET 14 of two N-channels of differential concatenation shares an isolated drive circuit 13, type of drive
Simply.Certainly, two enhanced MOSFET of N-channel of differential concatenation can also be respectively adopted an isolated drive circuit.
Specifically, the source electrode of two enhanced MOSFET of N-channel of differential concatenation link together, drain respectively with cascade
Two ac output ends connection of module, first output end of the grid respectively with two isolated drive circuits are connected, described two N
The source electrode of channel enhancement MOSFET is connected with the second output end of described two isolated drive circuits respectively.
In the case where bypass circuit is constituted by two enhanced MOSFET of N-channel of differential concatenation, in cascade module just
Often during work, two driving voltage Vgs of the enhanced MOSFET of N-channel of differential concatenation are always negative level, and N-channel strengthens
Type MOSFET element will not mislead because ac output end voltage change ratio du/dt is excessive in itself, this bypass scheme
Will not be influenceed by ac output end voltage change ratio du/dt；When cascade module breaks down, two N of differential concatenation
The driving voltage Vgs of channel enhancement MOSFET is changed into positive level so that two enhanced MOSFET of N-channel of differential concatenation lead
Logical, now electric current flows through from bypass circuit (i.e. two enhanced MOSFET of N-channel of differential concatenation), by malfunctioning module from system
In cut away, from without influence system normal work.
In order to further reduce the power consumption of bypass circuit, can be in the exchange outlet side parallel connection differential concatenation of cascade module
While two N-channels enhanced MOSFET, then parallel manipulator switch.As shown in figure 5, the bypass circuit also include with it is reverse
Two mechanical switch 15 of N-channel enhanced MOSFET 14 parallel connections of series connection, so that when cascade module 11 breaks down, instead
(closure) is acted simultaneously to the enhanced MOSFET 14 of two N-channels and mechanical switch 15 of series connection, due to two of differential concatenation
The responsiveness of the enhanced MOSFET 14 of N-channel is very fast (in Microsecond grade), and the action of mechanical switch 15 is relatively slow (in millisecond
Level), so by-pass current first passes through the enhanced place branch roads of MOSFET 14 of two N-channels of differential concatenation, treat mechanical switch 15
Pass through the place branch road of mechanical switch 15 after closure again.
It should be noted that, although the embodiment of the present invention is only with full-controlled switch pipe as IGBT and N-channel is enhanced
Illustrated as a example by MOSFET, but this is not construed as limiting the invention, and disclosure satisfy that the other kinds of full-control type of requirement is opened
Close pipe also within the scope of the present invention.
In sum, bypass circuit described in the embodiment of the present invention uses the full-controlled switch existing IGCT of pipe circuitry instead
Circuit, can avoid being misleaded because ac output end voltage change ratio du/dt is excessive, therefore will not be subject to ac output end electricity
The influence of buckling rate du/dt, and reliable operation, bypass changeover be quick, small volume, low in energy consumption.
It is understood that the embodiment of above principle being intended to be merely illustrative of the present and the exemplary implementation for using
Mode, but the invention is not limited in this.For those skilled in the art, essence of the invention is not being departed from
In the case of god and essence, various changes and modifications can be made therein, and these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of bypass circuit, its exchange outlet side for being connected in parallel on each cascade module, it is characterised in that the bypass circuit bag
One group of full-controlled switch pipe is included, it is configured with drive circuit.
2. bypass circuit according to claim 1, it is characterised in that the bypass circuit includes that two of differential concatenation are complete
Control type switching tube.
3. bypass circuit according to claim 2, it is characterised in that two full-controlled switch pipes of the differential concatenation are total to
With an isolated drive circuit.
4. bypass circuit according to claim 2, it is characterised in that the full-controlled switch pipe is IGBT, and reversely string
The emitter stage of two IGBT of connection links together, colelctor electrode is connected with two ac output ends of cascade module respectively, grid
The first output end of same isolated drive circuit is connected to, the emitter stage of described two IGBT is connected to the isolated drive circuit
The second output end.
5. bypass circuit according to claim 2, it is characterised in that the full-controlled switch pipe is IGBT, and reversely string
The emitter stage of two IGBT of connection links together, colelctor electrode is connected with two ac output ends of cascade module respectively, grid
The first output end with two isolated drive circuits is connected respectively, and the emitter stage of described two IGBT is isolated with described two respectively
The second output end connection of drive circuit.
6. bypass circuit according to claim 2, it is characterised in that the full-controlled switch pipe is that N-channel is enhanced
MOSFET, and the source electrode of two enhanced MOSFET of N-channel of differential concatenation link together, drain respectively with cascade module
The connection of two ac output ends, grid are connected to the first output end of same isolated drive circuit, and described two N-channels are enhanced
The source electrode of MOSFET is connected to the second output end of the isolated drive circuit.
7. bypass circuit according to claim 2, it is characterised in that the full-controlled switch pipe is that N-channel is enhanced
MOSFET, and the source electrode of two enhanced MOSFET of N-channel of differential concatenation link together, drain respectively with cascade module
Two ac output end connections, first output ends of the grid respectively with two isolated drive circuits are connected, and described two N-channels increase
The source electrode of strong type MOSFET is connected with the second output end of described two isolated drive circuits respectively.
8. bypass circuit according to claim 2, it is characterised in that the full-controlled switch pipe has been internally integrated reversely
Diode in parallel, or outside is connected to the diode of reverse parallel connection.
9. the bypass circuit according to any one of claim 1-8, it is characterised in that the bypass circuit also includes and institute
State one group of full-controlled switch pipe mechanical switch in parallel.
10. bypass circuit according to claim 9, it is characterised in that the mechanical switch is relay or contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710155053.4A CN106849634A (en) | 2017-03-14 | 2017-03-14 | A kind of bypass circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710155053.4A CN106849634A (en) | 2017-03-14 | 2017-03-14 | A kind of bypass circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106849634A true CN106849634A (en) | 2017-06-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710155053.4A Pending CN106849634A (en) | 2017-03-14 | 2017-03-14 | A kind of bypass circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832607A (en) * | 2011-06-15 | 2012-12-19 | 西门子公司 | Quick bypass device |
| CN202872382U (en) * | 2012-10-19 | 2013-04-10 | 中国西电电气股份有限公司 | A high-voltage chained STATCOM and a mixed bypass system employed by the high-voltage chained STATCOM |
| CN203352475U (en) * | 2013-07-03 | 2013-12-18 | 北京合康亿盛变频科技股份有限公司 | Bypass circuit of power unit cascaded high-voltage inverter |
| CN204030971U (en) * | 2014-08-22 | 2014-12-17 | 苏州汇川技术有限公司 | The power cell with bypass functionality of unit series connection type high voltage frequency convertor |
| CN206575326U (en) * | 2017-03-14 | 2017-10-20 | 特变电工新疆新能源股份有限公司 | A kind of bypass circuit |
-
2017
- 2017-03-14 CN CN201710155053.4A patent/CN106849634A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832607A (en) * | 2011-06-15 | 2012-12-19 | 西门子公司 | Quick bypass device |
| CN202872382U (en) * | 2012-10-19 | 2013-04-10 | 中国西电电气股份有限公司 | A high-voltage chained STATCOM and a mixed bypass system employed by the high-voltage chained STATCOM |
| CN203352475U (en) * | 2013-07-03 | 2013-12-18 | 北京合康亿盛变频科技股份有限公司 | Bypass circuit of power unit cascaded high-voltage inverter |
| CN204030971U (en) * | 2014-08-22 | 2014-12-17 | 苏州汇川技术有限公司 | The power cell with bypass functionality of unit series connection type high voltage frequency convertor |
| CN206575326U (en) * | 2017-03-14 | 2017-10-20 | 特变电工新疆新能源股份有限公司 | A kind of bypass circuit |
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