CN103944436B - Three-phase fault-tolerant inverter circuit and control method thereof - Google Patents

Three-phase fault-tolerant inverter circuit and control method thereof Download PDF

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CN103944436B
CN103944436B CN201410206324.0A CN201410206324A CN103944436B CN 103944436 B CN103944436 B CN 103944436B CN 201410206324 A CN201410206324 A CN 201410206324A CN 103944436 B CN103944436 B CN 103944436B
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brachium pontis
igbt
inverter bridge
bipolar transistor
bridge leg
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CN103944436A (en
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贺虎成
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Xian University of Science and Technology
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Xian University of Science and Technology
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Abstract

The invention discloses a three-phase fault-tolerant inverter circuit and a control method thereof. The three-phase fault-tolerant inverter circuit comprises a direct current power supply and an inverter bridge, the upper bridge arm of a first inverter bridge arm is connected with a high-speed fuse F1 while the lower bridge arm is connected with a high-speed fuse F4, the upper bridge arm of a second inverter bridge arm is connected with a high-speed fuse F3 while the lower bridge arm is connected with a high-speed fuse F6, and the upper bridge arm of a third inverter bridge arm is connected with a high-speed fuse F5 while the lower bridge arm is connected with a high-speed fuse F2; an auxiliary inverter circuit is connected between the direct current power supply and the inverter bridge and is composed of an auxiliary upper bridge arm insulated gate bipolar transistor Q7, an auxiliary lower bridge arm insulated gate bipolar transistor A8, an auxiliary first inverter bridge arm insulated gate bipolar transistor S1, an auxiliary second inverter bridge arm insulated gate bipolar transistor S2, an auxiliary third inverter bridge arm insulated gate bipolar transistor S3 and single-phase bridge rectifiers Z1, Z2 and Z3. The three-phase fault-tolerant inverter circuit and the control method thereof realize to isolate the fault of the bridge arm with short circuit or open circuit fault and have good fault-tolerant running function.

Description

A kind of fault-tolerant inverter circuit of three-phase and control method thereof
Technical field
The invention belongs to inverter technology field, be specifically related to the fault-tolerant inverter circuit of a kind of three-phase and control method thereof.
Background technology
Inverter is used for direct current energy to be transformed into AC energy, and according to the difference of DC side power supply natures, inverter is divided into current source inverter and voltage source inverter.Voltage source inverter is because structure is simple, control the plurality of advantages such as flexible, and be widely applied, but power electronic device is wherein the weak link the most easily broken down, its integrity problem is never effectively solved.Three-phase inverter adopts the three-phase bridge type inverse structure of standard usually, it does not have failure tolerant ability, people take the methods such as the use of element derate or parallel redundancy element to design inverter usually in order to the reliability improving inverter, but these two kinds of methods for designing can make system cost too high, volume weight increases, pursuing low cost and the limited application scenario of installing space, the integrity problem of inverter is still very outstanding.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, there is provided a kind of structure simple, realize convenient, short trouble can be converted to open fault, achieve the Fault Isolation of short trouble or open fault place brachium pontis, avoid the generation of secondary failure, there is the fault-tolerant inverter circuit of three-phase of good fault-tolerant operation function.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the fault-tolerant inverter circuit of a kind of three-phase, comprise DC power supply and under the control of external control circuit by the inverter bridge of converting direct-current power into alternating-current power, described inverter bridge is made up of the first inverter bridge leg, the second inverter bridge leg and the 3rd inverter bridge leg, the upper brachium pontis of described first inverter bridge leg is connected with brachium pontis igbt Q on first 1, the lower brachium pontis of described first inverter bridge leg is connected with first time brachium pontis igbt Q 4, the upper brachium pontis of described first inverter bridge leg and the link of lower brachium pontis are the first output of inverter bridge, the upper brachium pontis of described second inverter bridge leg are connected with brachium pontis igbt Q on second 3, the lower brachium pontis of described second inverter bridge leg is connected with second time brachium pontis igbt Q 6, the upper brachium pontis of described second inverter bridge leg and the link of lower brachium pontis are the second output of inverter bridge, the upper brachium pontis of described 3rd inverter bridge leg are connected with brachium pontis igbt Q on the 3rd 5, the lower brachium pontis of described 3rd inverter bridge leg is connected with the 3rd time brachium pontis igbt Q 2, the upper brachium pontis of described 3rd inverter bridge leg and the link of lower brachium pontis are the 3rd output of inverter bridge; It is characterized in that: the upper brachium pontis of described first inverter bridge leg is connected with first on brachium pontis igbt Q 1series connection and for by brachium pontis igbt Q on first 1short trouble be converted to the fast acting fuse F of the upper brachium pontis open fault of the first inverter bridge leg 1, the lower brachium pontis of described first inverter bridge leg is connected with and first time brachium pontis igbt Q 4series connection and for by first time brachium pontis igbt Q 4short trouble be converted to the fast acting fuse F of the lower brachium pontis open fault of the first inverter bridge leg 4, the upper brachium pontis of described second inverter bridge leg is connected with second on brachium pontis igbt Q 3series connection and for by brachium pontis igbt Q on second 3short trouble be converted to the fast acting fuse F of the upper brachium pontis open fault of the second inverter bridge leg 3, the lower brachium pontis of described second inverter bridge leg is connected with and second time brachium pontis igbt Q 6be in series with for by second time brachium pontis igbt Q 6short trouble be converted to the fast acting fuse F of the lower brachium pontis open fault of the second inverter bridge leg 6, the upper brachium pontis of described 3rd inverter bridge leg is connected with the 3rd on brachium pontis igbt Q 5series connection and for by brachium pontis igbt Q on the 3rd 5short trouble be converted to the fast acting fuse F of the upper brachium pontis open fault of the 3rd inverter bridge leg 5, the lower brachium pontis of described 3rd inverter bridge leg is connected with and the 3rd time brachium pontis igbt Q 2series connection and for by the 3rd time brachium pontis igbt Q 2short trouble be converted to the fast acting fuse F of the lower brachium pontis open fault of the 3rd inverter bridge leg 2; Be connected with the inversion auxiliary circuit for making inverter bridge fault-tolerant operation under the control of external control circuit between described DC power supply and inverter bridge, described inversion auxiliary circuit is by upper brachium pontis supplementary insulation grid bipolar transistor Q 7, lower brachium pontis supplementary insulation grid bipolar transistor Q 8, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1, the second inverter bridge leg supplementary insulation grid bipolar transistor S 2with the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3, and single-phase rectification bridge Z 1, single-phase rectification bridge Z 2with single-phase rectification bridge Z 3composition; Described upper brachium pontis supplementary insulation grid bipolar transistor Q 7collector electrode connect with the positive pole of DC power supply, described upper brachium pontis supplementary insulation grid bipolar transistor Q 7emitter and lower brachium pontis supplementary insulation grid bipolar transistor Q 8collector electrode connect, described lower brachium pontis supplementary insulation grid bipolar transistor Q 8emitter connect with the negative pole of DC power supply, described single-phase rectification bridge Z 1an ac input end, single-phase rectification bridge Z 2an ac input end and single-phase rectification bridge Z 3an ac input end all with upper brachium pontis supplementary insulation grid bipolar transistor Q 7emitter and lower brachium pontis supplementary insulation grid bipolar transistor Q 8the link of collector electrode connect, described single-phase rectification bridge Z 1another ac input end connect with the first output of inverter bridge, described single-phase rectification bridge Z 2another ac input end connect with the second output of inverter bridge, described single-phase rectification bridge Z 3another ac input end connect with the 3rd output of inverter bridge, described first inverter bridge leg supplementary insulation grid bipolar transistor S 1collector electrode and single-phase rectification bridge Z 1cathode output end connect, described first inverter bridge leg supplementary insulation grid bipolar transistor S 1emitter and single-phase rectification bridge Z 1cathode output end connect, described second inverter bridge leg supplementary insulation grid bipolar transistor S 2collector electrode and single-phase rectification bridge Z 2cathode output end connect, described second inverter bridge leg supplementary insulation grid bipolar transistor S 2emitter and single-phase rectification bridge Z 2cathode output end connect, described 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3collector electrode and single-phase rectification bridge Z 3cathode output end connect, described 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3emitter and single-phase rectification bridge Z 3cathode output end connect.
The above-mentioned fault-tolerant inverter circuit of a kind of three-phase, is characterized in that: brachium pontis igbt Q on described first 1by antiparallel igbt and diode composition, described first time brachium pontis igbt Q 4by antiparallel igbt and diode composition, brachium pontis igbt Q on described second 3by antiparallel igbt and diode composition, described second time brachium pontis igbt Q 6by antiparallel igbt and diode composition, brachium pontis igbt Q on the described 3rd 5by antiparallel igbt and diode composition, described 3rd time brachium pontis igbt Q 2by antiparallel igbt and diode composition, described upper brachium pontis supplementary insulation grid bipolar transistor Q 7by antiparallel igbt and diode composition, described lower brachium pontis supplementary insulation grid bipolar transistor Q 8by antiparallel igbt and diode composition, described first inverter bridge leg supplementary insulation grid bipolar transistor S 1by antiparallel igbt and diode composition, described second inverter bridge leg supplementary insulation grid bipolar transistor S 2by antiparallel igbt and diode composition, described 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3by antiparallel igbt and diode composition.
The above-mentioned fault-tolerant inverter circuit of a kind of three-phase, is characterized in that: described diode diode diode diode diode diode diode diode diode diode and diode be fast recovery diode or high-frequency diode.
Present invention also offers a kind of method step simple, avoid the generation of secondary failure, there is good fault-tolerant operation function, the control method of the fault-tolerant inverter circuit of the three-phase of the reliability of system can be ensured, it is characterized in that the method comprises the following steps:
Step one, when on xth inverter bridge leg brachium pontis open circuit or xth inverter bridge leg on igbt short circuit time, described external control circuit sends control signal conducting xth inverter bridge leg supplementary insulation grid bipolar transistor S x; Wherein, the value of x is 1,2 or 3;
Step 2, judge it is the igbt short circuit of upper brachium pontis open circuit maybe on this on brachium pontis of xth inverter bridge leg, or the igbt short circuit of the lower brachium pontis open circuit of xth inverter bridge leg maybe on this lower brachium pontis, or the upper brachium pontis of xth inverter bridge leg and lower brachium pontis are all opened a way the igbt maybe on this on brachium pontis and the equal short circuit of igbt on this lower brachium pontis;
When the igbt short circuit maybe on this on brachium pontis of the upper brachium pontis open circuit of xth inverter bridge leg, described external control circuit stops the control signal sending the igbt on brachium pontis on this, meanwhile, control logic when described external control circuit normally works according to its igbt controlled on this on brachium pontis is to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control;
When the igbt short circuit maybe on this lower brachium pontis of the lower brachium pontis open circuit of xth inverter bridge leg, described external control circuit stops the control signal sending the igbt on this lower brachium pontis, meanwhile, control logic when described external control circuit normally works according to its igbt controlled on this lower brachium pontis is to lower brachium pontis supplementary insulation grid bipolar transistor Q 8control;
When the upper brachium pontis of xth inverter bridge leg and lower brachium pontis all open a way the igbt maybe on this on brachium pontis and the equal short circuit of the igbt on this lower brachium pontis, described external control circuit stops the control signal sending the igbt on the igbt on brachium pontis on this and this lower brachium pontis, meanwhile, control logic when described external control circuit normally works according to its igbt controlled on this on brachium pontis is to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control, control logic when described external control circuit normally works according to its igbt controlled on this lower brachium pontis is to lower brachium pontis supplementary insulation grid bipolar transistor Q 8control.
The present invention compared with prior art has the following advantages:
1, the circuit structure of the fault-tolerant inverter circuit of three-phase of the present invention is simple, and the control method of the fault-tolerant inverter circuit of three-phase realizes simple, and it is convenient to realize.
2, the present invention by connecting fast acting fuse on each brachium pontis of traditional inverter bridge, when there is igbt short trouble, the fast acting fuse on this igbt place brachium pontis will be burnt, achieve the conversion of short trouble to open fault, simultaneously, when single brachium pontis open fault, external control circuit stops exporting control signal to Trouble ticket brachium pontis, single brachium pontis open fault just can not have an impact to reconstruct inverter, achieve the Fault Isolation of open circuit or short trouble place brachium pontis, avoid or reduce the impact of fault on whole system; Fault Isolation is the technology faulty component diagnosed out and other normal segments being carried out being separated, and the fault of inverter bridge must be taken measures to isolate, otherwise can affect the work of other normal segments, cause secondary failure after successfully being diagnosed; Present invention effectively avoids the generation of secondary failure.
3, the present invention by adding inversion auxiliary circuit between DC power supply and inverter bridge, achieve the igbt short circuit on brachium pontis on the open circuit of brachium pontis on inverter bridge list or inverter bridge list, igbt short circuit under inverter bridge list under brachium pontis open circuit or inverter bridge list on brachium pontis, and the upper brachium pontis of an inverter bridge brachium pontis and lower brachium pontis is all opened a way or the equal short circuit of igbt on the upper brachium pontis of an inverter bridge brachium pontis and lower brachium pontis time fault-tolerant operation, do not reduce the load capacity of whole inverter circuit, the performance of inverter circuit load can not be affected, the reliability service of whole system can be ensured.
4, of the present invention practical, result of use is good, is convenient to promote the use of.
In sum, the present invention realizes conveniently, short trouble can be converted to open fault, achieve the Fault Isolation of short trouble or open fault place brachium pontis, avoid the generation of secondary failure, there is good fault-tolerant operation function, the reliability of system can be ensured, practical, be convenient to promote the use of.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the fault-tolerant inverter circuit of three-phase of the present invention.
Fig. 2 a is that the upper brachium pontis of the first inverter bridge leg is opened a way or brachium pontis igbt Q on first 1short circuit, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1heng Tong, the 3rd time brachium pontis igbt Q 2heng Tong, upper brachium pontis supplementary insulation grid bipolar transistor Q 7current circuit figure during conducting.
Fig. 2 b is that the upper brachium pontis of the first inverter bridge leg is opened a way or brachium pontis igbt Q on first 1short circuit, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1heng Tong, the 3rd time brachium pontis igbt Q 2heng Tong, upper brachium pontis supplementary insulation grid bipolar transistor Q 7current circuit figure during shutoff.
Fig. 3 a is that the upper brachium pontis of the first inverter bridge leg is opened a way or brachium pontis igbt Q on first 1short circuit, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1heng Tong, upper brachium pontis supplementary insulation grid bipolar transistor Q 7heng Tong, the 3rd time brachium pontis igbt Q 2current circuit figure during conducting.
Fig. 3 b is that the upper brachium pontis of the first inverter bridge leg is opened a way or brachium pontis igbt Q on first 1short circuit, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1heng Tong, upper brachium pontis supplementary insulation grid bipolar transistor Q 7heng Tong, the 3rd time brachium pontis igbt Q 2current circuit figure during shutoff.
Fig. 4 a is lower brachium pontis open circuit or the 3rd time brachium pontis igbt Q of the 3rd inverter bridge leg 2short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8brachium pontis igbt Q in Heng Tong, first 1current circuit figure during conducting.
Fig. 4 b is lower brachium pontis open circuit or the 3rd time brachium pontis igbt Q of the 3rd inverter bridge leg 2short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8brachium pontis igbt Q in Heng Tong, first 1current circuit figure during shutoff.
Fig. 5 a is lower brachium pontis open circuit or the 3rd time brachium pontis igbt Q of the 3rd inverter bridge leg 2short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q in Heng Tong, first 1heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8current circuit figure during conducting.
Fig. 5 b is lower brachium pontis open circuit or the 3rd time brachium pontis igbt Q of the 3rd inverter bridge leg 2short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q in Heng Tong, first 1heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8current circuit figure during shutoff.
Fig. 6 a is the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis is all opened a way or brachium pontis igbt Q on the 3rd 5with the 3rd time brachium pontis igbt Q 2equal short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8brachium pontis igbt Q in Heng Tong, first 1current circuit figure during conducting.
Fig. 6 b is the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis is all opened a way or brachium pontis igbt Q on the 3rd 5with the 3rd time brachium pontis igbt Q 2equal short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8brachium pontis igbt Q in Heng Tong, first 1current circuit figure during shutoff.
Fig. 7 a is the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis is all opened a way or brachium pontis igbt Q on the 3rd 5with the 3rd time brachium pontis igbt Q 2equal short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q in Heng Tong, first 1heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8current circuit figure during conducting.
Fig. 7 b is the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis is all opened a way or brachium pontis igbt Q on the 3rd 5with the 3rd time brachium pontis igbt Q 2equal short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q in Heng Tong, first 1heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8current circuit figure during shutoff.
Description of reference numerals:
1-DC power supply; 2-inversion auxiliary circuit; 3-inverter bridge;
4-three-phase brushless dc motor.
Embodiment
As shown in Figure 1, the fault-tolerant inverter circuit of three-phase of the present invention, comprise DC power supply 1 and under the control of external control circuit by the inverter bridge 3 of converting direct-current power into alternating-current power, described inverter bridge 3 is made up of the first inverter bridge leg, the second inverter bridge leg and the 3rd inverter bridge leg, the upper brachium pontis of described first inverter bridge leg is connected with brachium pontis igbt Q on first 1, the lower brachium pontis of described first inverter bridge leg is connected with first time brachium pontis igbt Q 4, the upper brachium pontis of described first inverter bridge leg and the link of lower brachium pontis are the first output of inverter bridge 3, the upper brachium pontis of described second inverter bridge leg are connected with brachium pontis igbt Q on second 3, the lower brachium pontis of described second inverter bridge leg is connected with second time brachium pontis igbt Q 6, the upper brachium pontis of described second inverter bridge leg and the link of lower brachium pontis are the second output of inverter bridge 3, the upper brachium pontis of described 3rd inverter bridge leg are connected with brachium pontis igbt Q on the 3rd 5, the lower brachium pontis of described 3rd inverter bridge leg is connected with the 3rd time brachium pontis igbt Q 2, the upper brachium pontis of described 3rd inverter bridge leg and the link of lower brachium pontis are the 3rd output of inverter bridge 3; The upper brachium pontis of described first inverter bridge leg is connected with first on brachium pontis igbt Q 1series connection and for by brachium pontis igbt Q on first 1short trouble be converted to the fast acting fuse F of the upper brachium pontis open fault of the first inverter bridge leg 1, the lower brachium pontis of described first inverter bridge leg is connected with and first time brachium pontis igbt Q 4series connection and for by first time brachium pontis igbt Q 4short trouble be converted to the fast acting fuse F of the lower brachium pontis open fault of the first inverter bridge leg 4, the upper brachium pontis of described second inverter bridge leg is connected with second on brachium pontis igbt Q 3series connection and for by brachium pontis igbt Q on second 3short trouble be converted to the fast acting fuse F of the upper brachium pontis open fault of the second inverter bridge leg 3, the lower brachium pontis of described second inverter bridge leg is connected with and second time brachium pontis igbt Q 6be in series with for by second time brachium pontis igbt Q 6short trouble be converted to the fast acting fuse F of the lower brachium pontis open fault of the second inverter bridge leg 6, the upper brachium pontis of described 3rd inverter bridge leg is connected with the 3rd on brachium pontis igbt Q 5series connection and for by brachium pontis igbt Q on the 3rd 5short trouble be converted to the fast acting fuse F of the upper brachium pontis open fault of the 3rd inverter bridge leg 5, the lower brachium pontis of described 3rd inverter bridge leg is connected with and the 3rd time brachium pontis igbt Q 2series connection and for by the 3rd time brachium pontis igbt Q 2short trouble be converted to the fast acting fuse F of the lower brachium pontis open fault of the 3rd inverter bridge leg 2; Be connected with the inversion auxiliary circuit 2 for making inverter bridge 3 fault-tolerant operation under the control of external control circuit between described DC power supply 1 and inverter bridge 3, described inversion auxiliary circuit 2 is by upper brachium pontis supplementary insulation grid bipolar transistor Q 7, lower brachium pontis supplementary insulation grid bipolar transistor Q 8, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1, the second inverter bridge leg supplementary insulation grid bipolar transistor S 2with the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3, and single-phase rectification bridge Z 1, single-phase rectification bridge Z 2with single-phase rectification bridge Z 3composition; Described upper brachium pontis supplementary insulation grid bipolar transistor Q 7collector electrode connect with the positive pole of DC power supply 1, described upper brachium pontis supplementary insulation grid bipolar transistor Q 7emitter and lower brachium pontis supplementary insulation grid bipolar transistor Q 8collector electrode connect, described lower brachium pontis supplementary insulation grid bipolar transistor Q 8emitter connect with the negative pole of DC power supply 1, described single-phase rectification bridge Z 1an ac input end, single-phase rectification bridge Z 2an ac input end and single-phase rectification bridge Z 3an ac input end all with upper brachium pontis supplementary insulation grid bipolar transistor Q 7emitter and lower brachium pontis supplementary insulation grid bipolar transistor Q 8the link of collector electrode connect, described single-phase rectification bridge Z 1another ac input end connect with the first output of inverter bridge 3, described single-phase rectification bridge Z 2another ac input end connect with the second output of inverter bridge 3, described single-phase rectification bridge Z 3another ac input end connect with the 3rd output of inverter bridge 3, described first inverter bridge leg supplementary insulation grid bipolar transistor S 1collector electrode and single-phase rectification bridge Z 1cathode output end connect, described first inverter bridge leg supplementary insulation grid bipolar transistor S 1emitter and single-phase rectification bridge Z 1cathode output end connect, described second inverter bridge leg supplementary insulation grid bipolar transistor S 2collector electrode and single-phase rectification bridge Z 2cathode output end connect, described second inverter bridge leg supplementary insulation grid bipolar transistor S 2emitter and single-phase rectification bridge Z 2cathode output end connect, described 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3collector electrode and single-phase rectification bridge Z 3cathode output end connect, described 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3emitter and single-phase rectification bridge Z 3cathode output end connect.
In the present embodiment, brachium pontis igbt Q on described first 1by antiparallel igbt and diode composition, described first time brachium pontis igbt Q 4by antiparallel igbt and diode composition, brachium pontis igbt Q on described second 3by antiparallel igbt and diode composition, described second time brachium pontis igbt Q 6by antiparallel igbt and diode composition, brachium pontis igbt Q on the described 3rd 5by antiparallel igbt and diode composition, described 3rd time brachium pontis igbt Q 2by antiparallel igbt and diode composition, described upper brachium pontis supplementary insulation grid bipolar transistor Q 7by antiparallel igbt and diode composition, described lower brachium pontis supplementary insulation grid bipolar transistor Q 8by antiparallel igbt and diode composition, described first inverter bridge leg supplementary insulation grid bipolar transistor S 1by antiparallel igbt and diode composition, described second inverter bridge leg supplementary insulation grid bipolar transistor S 2by antiparallel igbt and diode composition, described 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3by antiparallel igbt and diode composition.
In the present embodiment, described diode diode diode diode diode diode diode diode diode diode and diode be fast recovery diode or high-frequency diode.
The control method of the fault-tolerant inverter circuit of three-phase of the present invention, comprises the following steps:
Step one, when on xth inverter bridge leg brachium pontis open circuit or xth inverter bridge leg on igbt short circuit time, described external control circuit sends control signal conducting xth inverter bridge leg supplementary insulation grid bipolar transistor S x; Wherein, the value of x is 1,2 or 3;
Step 2, judge it is the igbt short circuit of upper brachium pontis open circuit maybe on this on brachium pontis of xth inverter bridge leg, or the igbt short circuit of the lower brachium pontis open circuit of xth inverter bridge leg maybe on this lower brachium pontis, or the upper brachium pontis of xth inverter bridge leg and lower brachium pontis are all opened a way the igbt maybe on this on brachium pontis and the equal short circuit of igbt on this lower brachium pontis;
When the igbt short circuit maybe on this on brachium pontis of the upper brachium pontis open circuit of xth inverter bridge leg, described external control circuit stops the control signal sending the igbt on brachium pontis on this, meanwhile, control logic when described external control circuit normally works according to its igbt controlled on this on brachium pontis is to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control;
When the igbt short circuit maybe on this lower brachium pontis of the lower brachium pontis open circuit of xth inverter bridge leg, described external control circuit stops the control signal sending the igbt on this lower brachium pontis, meanwhile, control logic when described external control circuit normally works according to its igbt controlled on this lower brachium pontis is to lower brachium pontis supplementary insulation grid bipolar transistor Q 8control;
When the upper brachium pontis of xth inverter bridge leg and lower brachium pontis all open a way the igbt maybe on this on brachium pontis and the equal short circuit of the igbt on this lower brachium pontis, described external control circuit stops the control signal sending the igbt on the igbt on brachium pontis on this and this lower brachium pontis, meanwhile, control logic when described external control circuit normally works according to its igbt controlled on this on brachium pontis is to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control, control logic when described external control circuit normally works according to its igbt controlled on this lower brachium pontis is to lower brachium pontis supplementary insulation grid bipolar transistor Q 8control.
In order to verify the fault-tolerant operation effect of inverter circuit of the present invention, carry out the experiment that the present invention is applied to three-phase brushless dc motor 4 driving.Three-phase brushless dc motor 4 is operated in known 120o star three-phase six state, six states of three-phase brushless dc motor 4 are completely independent controlled, (electric current flows into three-phase brushless dc motor 4 from a phase to the state be energized with ac phase, c phase flows out three-phase brushless dc motor 4) be example, fault-tolerant operation effect of the present invention is analyzed as follows:
Brachium pontis igbt Q on the upper brachium pontis open circuit of (1) first inverter bridge leg first maybe on this on brachium pontis 1short circuit
Due to brachium pontis igbt Q on first 1during short circuit, fast acting fuse F 1can quick fuse, therefore fast acting fuse F 1by brachium pontis igbt Q on first 1short trouble conversion in order to the upper brachium pontis open fault of the first inverter bridge leg.
1. pipe modulation, lower pipe Heng Tong (HPWM_LON) modulation system is gone up
When upper pipe modulation, lower pipe Heng Tong (HPWM_LON) modulation system, three-phase brushless dc motor 4 is operated in brachium pontis igbt Q on first on the upper brachium pontis of the first inverter bridge leg 1the 3rd time brachium pontis igbt Q in the pwm control signal modulation exported by described external control circuit, the lower brachium pontis of the 3rd inverter bridge leg 2the state period of Heng Tong.
When without open circuit or short trouble, brachium pontis igbt Q on first 1pwm control signal modulation the conducting period, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; Brachium pontis igbt Q on first 1pwm control signal modulation turn off the period, brachium pontis igbt Q on first 1cut-off, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals zero.
Brachium pontis igbt Q on upper brachium pontis open circuit first maybe on this on brachium pontis of the first inverter bridge leg 1during short circuit, described external control circuit sends control signal conducting first inverter bridge leg supplementary insulation grid bipolar transistor S 1, allow the first inverter bridge leg supplementary insulation grid bipolar transistor S 1brachium pontis igbt Q on first 1with the 3rd time brachium pontis igbt Q 260 degree of interval conductings always of work; Described external control circuit stops sending brachium pontis igbt Q on first on brachium pontis on this 1control signal, meanwhile, described external control circuit controls brachium pontis igbt Q on first on this on brachium pontis according to it 1control logic during normal work is to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control, namely go up brachium pontis supplementary insulation grid bipolar transistor Q 7the pwm control signal modulation exported by described external control circuit, described external control circuit continues control the 3rd time brachium pontis igbt Q 2heng Tong, as shown in Figure 2 a and 2 b, Fig. 2 a is that the upper brachium pontis of the first inverter bridge leg is opened a way or brachium pontis igbt Q on first to the fault-tolerant operation situation of inverter circuit of the present invention 1short circuit, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1heng Tong, the 3rd time brachium pontis igbt Q 2heng Tong, upper brachium pontis supplementary insulation grid bipolar transistor Q 7current circuit figure during conducting, Fig. 2 b are that the upper brachium pontis of the first inverter bridge leg is opened a way or brachium pontis igbt Q on first 1short circuit, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1heng Tong, the 3rd time brachium pontis igbt Q 2heng Tong, upper brachium pontis supplementary insulation grid bipolar transistor Q 7current circuit figure during shutoff.
As can be seen from Fig. 2 a, when external control circuit controls upper brachium pontis supplementary insulation grid bipolar transistor Q 7during conducting, the positive pole of DC power supply 1 is through igbt single-phase rectification bridge Z 1and igbt the a phase being added to three-phase brushless dc motor 4 is held, and the negative pole of DC power supply 1 is through fast acting fuse F 2and igbt the c phase being added to three-phase brushless dc motor 4 is held, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; As can be seen from Fig. 2 b, when external control circuit controls upper brachium pontis supplementary insulation grid bipolar transistor Q 7during shutoff, the electric current of three-phase brushless dc motor 4 is by fast acting fuse F 2, fast acting fuse F 4and diode formed continuous current circuit, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals zero.As can be seen here, brachium pontis igbt Q on upper brachium pontis open circuit first maybe on this on brachium pontis of the first inverter bridge leg 1during short circuit, due to the fault-tolerant operation of inverter circuit of the present invention, the output performance of three-phase brushless dc motor 4 can't be affected.
2. pipe modulation, upper pipe Heng Tong (HON_LPWM) modulation system is descended
When lower pipe modulation, upper pipe Heng Tong (HON_LPWM) modulation system, three-phase brushless dc motor 4 is operated in the 3rd time brachium pontis igbt Q on the lower brachium pontis of the 3rd inverter bridge leg 2brachium pontis igbt Q in the pwm control signal modulation exported by described external control circuit, the upper brachium pontis of the first inverter bridge leg first 1the state period of Heng Tong.
When without open circuit or short trouble, at the 3rd time brachium pontis igbt Q 2pwm control signal modulation the conducting period, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; At the 3rd time brachium pontis igbt Q 2pwm control signal modulation turn off the period, the 3rd time brachium pontis igbt Q 2cut-off, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals zero.
Brachium pontis igbt Q on upper brachium pontis open circuit first maybe on this on brachium pontis of the first inverter bridge leg 1during short circuit, described external control circuit sends control signal conducting first inverter bridge leg supplementary insulation grid bipolar transistor S 1, allow the first inverter bridge leg supplementary insulation grid bipolar transistor S 1brachium pontis igbt Q on first 1with the 3rd time brachium pontis igbt Q 260 degree of interval conductings always of work; Described external control circuit stops sending brachium pontis igbt Q on first on brachium pontis on this 1control signal, meanwhile, described external control circuit controls brachium pontis igbt Q on first on this on brachium pontis according to it 1control logic during normal work is to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control, namely control upper brachium pontis supplementary insulation grid bipolar transistor Q 7heng Tong, the 3rd time brachium pontis igbt Q 2continue the pwm control signal modulation exported by described external control circuit, as shown in Figure 3 a and Figure 3 b shows, Fig. 3 a is that the upper brachium pontis of the first inverter bridge leg is opened a way or brachium pontis igbt Q on first to the fault-tolerant operation situation of inverter circuit of the present invention 1short circuit, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1heng Tong, upper brachium pontis supplementary insulation grid bipolar transistor Q 7heng Tong, the 3rd time brachium pontis igbt Q 2current circuit figure during conducting, Fig. 3 b are that the upper brachium pontis of the first inverter bridge leg is opened a way or brachium pontis igbt Q on first 1short circuit, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1heng Tong, upper brachium pontis supplementary insulation grid bipolar transistor Q 7heng Tong, the 3rd time brachium pontis igbt Q 2current circuit figure during shutoff.
As can be seen from Fig. 3 a, when external control circuit controls the 3rd time brachium pontis igbt Q 2during conducting, the positive pole of DC power supply 1 is through igbt single-phase rectification bridge Z 1and igbt the a phase being added to three-phase brushless dc motor 4 is held, and the negative pole of DC power supply 1 is through fast acting fuse F 2and igbt the c phase being added to three-phase brushless dc motor 4 is held, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; As can be seen from Fig. 3 b, when external control circuit controls the 3rd time brachium pontis igbt Q 2during shutoff, the electric current of three-phase brushless dc motor 4 passes through diode fast acting fuse F 5, igbt single-phase rectification bridge Z 1and igbt formed continuous current circuit, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals zero.As can be seen here, brachium pontis igbt Q on upper brachium pontis open circuit first maybe on this on brachium pontis of the first inverter bridge leg 1during short circuit, due to the fault-tolerant operation of inverter circuit of the present invention, the output performance of three-phase brushless dc motor 4 can't be affected.
The lower brachium pontis open circuit of (2) the 3rd inverter bridge legs the 3rd time brachium pontis igbt Q maybe on this lower brachium pontis 2short circuit
Due to the 3rd time brachium pontis igbt Q 2during short circuit, fast acting fuse F 2can quick fuse, therefore fast acting fuse F 2by the 3rd time brachium pontis igbt Q 2short trouble conversion in order to the lower brachium pontis open fault of the 3rd inverter bridge leg.
1. pipe modulation, lower pipe Heng Tong (HPWM_LON) modulation system is gone up
When upper pipe modulation, lower pipe Heng Tong (HPWM_LON) modulation system, three-phase brushless dc motor 4 is operated in brachium pontis igbt Q on first on the upper brachium pontis of the first inverter bridge leg 1the 3rd time brachium pontis igbt Q in the pwm control signal modulation exported by described external control circuit, the lower brachium pontis of the 3rd inverter bridge leg 2the state period of Heng Tong.
When without open circuit or short trouble, brachium pontis igbt Q on first 1pwm control signal modulation the conducting period, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; Brachium pontis igbt Q on first 1pwm control signal modulation turn off the period, brachium pontis igbt Q on first 1cut-off, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals zero.
As the three time brachium pontis igbt Q of lower brachium pontis open circuit maybe on this lower brachium pontis of the 3rd inverter bridge leg 2during short circuit, described external control circuit sends control signal conducting the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3, allow the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q on first 1with the 3rd time brachium pontis igbt Q 260 degree of interval conductings always of work; Described external control circuit stops sending the 3rd time brachium pontis igbt Q 2control signal, meanwhile, described external control circuit controls the 3rd time brachium pontis igbt Q on this lower brachium pontis according to it 2control logic during normal work is to lower brachium pontis supplementary insulation grid bipolar transistor Q 8control, namely control lower brachium pontis supplementary insulation grid bipolar transistor Q 8heng Tong, brachium pontis igbt Q on first 1continue the pwm control signal modulation exported by described external control circuit, as shown in figures 4 a and 4b, Fig. 4 a is lower brachium pontis open circuit or the 3rd time brachium pontis igbt Q of the 3rd inverter bridge leg to the fault-tolerant operation situation of inverter circuit of the present invention 2short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8brachium pontis igbt Q in Heng Tong, first 1current circuit figure during conducting, Fig. 4 b are lower brachium pontis open circuit or the 3rd time brachium pontis igbt Q of the 3rd inverter bridge leg 2short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8brachium pontis igbt Q in Heng Tong, first 1current circuit figure during shutoff.
As can be seen from Fig. 4 a, when external control circuit controls brachium pontis igbt Q on first 1during conducting, the positive pole of DC power supply 1 is through fast acting fuse F 1and igbt the a phase being added to three-phase brushless dc motor 4 is held, and the negative pole of DC power supply 1 is through igbt single-phase rectification bridge Z 3with the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3the c phase being added to three-phase brushless dc motor 4 is held, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; As can be seen from Fig. 4 b, when external control circuit controls brachium pontis igbt Q on first 1during shutoff, the electric current of three-phase brushless dc motor 4 passes through igbt single-phase rectification bridge Z 3, igbt fast acting fuse F 4and diode formed continuous current circuit, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals zero.As can be seen here, as the three time brachium pontis igbt Q of lower brachium pontis open circuit maybe on this lower brachium pontis of the 3rd inverter bridge leg 2during short circuit, due to the fault-tolerant operation of inverter circuit of the present invention, the output performance of three-phase brushless dc motor 4 can't be affected.
2. pipe modulation, upper pipe Heng Tong (HON_LPWM) modulation system is descended
When lower pipe modulation, upper pipe Heng Tong (HON_LPWM) modulation system, three-phase brushless dc motor 4 is operated in the 3rd time brachium pontis igbt Q on the lower brachium pontis of the 3rd inverter bridge leg 2brachium pontis igbt Q in the pwm control signal modulation exported by described external control circuit, the upper brachium pontis of the first inverter bridge leg first 1the state period of Heng Tong.
When without open circuit or short trouble, at the 3rd time brachium pontis igbt Q 2pwm control signal modulation the conducting period, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; At the 3rd time brachium pontis igbt Q 2pwm control signal modulation turn off the period, the 3rd time brachium pontis igbt Q 2cut-off, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals zero.
As the three time brachium pontis igbt Q of lower brachium pontis open circuit maybe on this lower brachium pontis of the 3rd inverter bridge leg 2during short circuit, described external control circuit sends control signal conducting the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3, allow the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q on first 1with the 3rd time brachium pontis igbt Q 260 degree of interval conductings always of work; Described external control circuit stops sending the 3rd time brachium pontis igbt Q 2control signal, meanwhile, described external control circuit controls the 3rd time brachium pontis igbt Q on this lower brachium pontis according to it 2control logic during normal work is to lower brachium pontis supplementary insulation grid bipolar transistor Q 8control, namely descend brachium pontis supplementary insulation grid bipolar transistor Q 8the pwm control signal modulation exported by described external control circuit, described external control circuit continues brachium pontis igbt Q in control first 1heng Tong, as shown in figure 5 a and 5b, Fig. 5 a is lower brachium pontis open circuit or the 3rd time brachium pontis igbt Q of the 3rd inverter bridge leg to the fault-tolerant operation situation of inverter circuit of the present invention 2short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q in Heng Tong, first 1heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8current circuit figure during conducting, Fig. 5 b are lower brachium pontis open circuit or the 3rd time brachium pontis igbt Q of the 3rd inverter bridge leg 2short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q in Heng Tong, first 1heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8current circuit figure during shutoff.
As can be seen from Fig. 5 a, when external control circuit controls lower brachium pontis supplementary insulation grid bipolar transistor Q 8during conducting, the positive pole of DC power supply 1 is through fast acting fuse F 1and igbt the a phase being added to three-phase brushless dc motor 4 is held, and the negative pole of DC power supply 1 is through igbt single-phase rectification bridge Z 3the c phase being added to three-phase brushless dc motor 4 with the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S3 is held, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; As can be seen from Fig. 5 b, when external control circuit controls lower brachium pontis supplementary insulation grid bipolar transistor Q 8during shutoff, the electric current of three-phase brushless dc motor 4 passes through diode fast acting fuse F 5with fast acting fuse F 1formed continuous current circuit, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals zero.As can be seen here, as the three time brachium pontis igbt Q of lower brachium pontis open circuit maybe on this lower brachium pontis of the 3rd inverter bridge leg 2during short circuit, due to the fault-tolerant operation of inverter circuit of the present invention, the output performance of three-phase brushless dc motor 4 can't be affected.
The upper brachium pontis of (3) the 3rd inverter bridge legs and lower brachium pontis are all opened a way brachium pontis igbt Q on the 3rd maybe on this on brachium pontis 5with time brachium pontis igbt Q of the 3rd on this lower brachium pontis 2equal short circuit
Due to brachium pontis igbt Q on the 3rd 5during short circuit, fast acting fuse F 5can quick fuse, therefore fast acting fuse F 5by brachium pontis igbt Q on the 3rd 5short trouble conversion in order to the upper brachium pontis open fault of the 3rd inverter bridge leg; Due to the 3rd time brachium pontis igbt Q 2during short circuit, fast acting fuse F 2can quick fuse, therefore fast acting fuse F 2by the 3rd time brachium pontis igbt Q 2short trouble conversion in order to the lower brachium pontis open fault of the 3rd inverter bridge leg.
1. pipe modulation, lower pipe Heng Tong (HPWM_LON) modulation system is gone up
When upper pipe modulation, lower pipe Heng Tong (HPWM_LON) modulation system, three-phase brushless dc motor 4 is operated in brachium pontis igbt Q on first on the upper brachium pontis of the first inverter bridge leg 1the 3rd time brachium pontis igbt Q in the pwm control signal modulation exported by described external control circuit, the lower brachium pontis of the 3rd inverter bridge leg 2the state period of Heng Tong.
When without open circuit or short trouble, brachium pontis igbt Q on first 1pwm control signal modulation the conducting period, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; Brachium pontis igbt Q on first 1pwm control signal modulation turn off the period, brachium pontis igbt Q on first 1cut-off, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals zero.
Brachium pontis igbt Q on the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis all open a way the 3rd maybe on this on brachium pontis 5with time brachium pontis igbt Q of the 3rd on this lower brachium pontis 2during equal short circuit, described external control circuit sends control signal conducting the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3, allow the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q on first 1with the 3rd time brachium pontis igbt Q 260 degree of interval conductings always of work; Described external control circuit stops sending to brachium pontis igbt Q on the 3rd 5with the 3rd time brachium pontis igbt Q 2control signal, meanwhile, described external control circuit controls brachium pontis igbt Q on the 3rd on this on brachium pontis according to it 5control logic during normal work is to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control, because three-phase brushless dc motor 4 is operated in the state that ac phase is energized, therefore when without open circuit or short trouble, described external control circuit is not also to brachium pontis igbt Q on the 3rd 5control, so described external control circuit is not also to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control; Described external control circuit controls the 3rd time brachium pontis igbt Q on this lower brachium pontis according to it 2control logic during normal work is to lower brachium pontis supplementary insulation grid bipolar transistor Q 8control, namely control lower brachium pontis supplementary insulation grid bipolar transistor Q 8heng Tong, brachium pontis igbt Q on first 1continue the pwm control signal modulation exported by described external control circuit, as shown in figures 6 a and 6b, Fig. 6 a is the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis is all opened a way or brachium pontis igbt Q on the 3rd to the fault-tolerant operation situation of inverter circuit of the present invention 5with the 3rd time brachium pontis igbt Q 2equal short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8brachium pontis igbt Q in Heng Tong, first 1current circuit figure during conducting, Fig. 6 b are the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis is all opened a way or brachium pontis igbt Q on the 3rd 5with the 3rd time brachium pontis igbt Q 2equal short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8brachium pontis igbt Q in Heng Tong, first 1current circuit figure during shutoff.
As can be seen from Fig. 6 a, when external control circuit controls brachium pontis igbt Q on first 1during conducting, the positive pole of DC power supply 1 is through fast acting fuse F 1and igbt the a phase being added to three-phase brushless dc motor 4 is held, and the negative pole of DC power supply 1 is through igbt single-phase rectification bridge Z 3with the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3the c phase being added to three-phase brushless dc motor 4 is held, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; As can be seen from Fig. 6 b, when external control circuit controls brachium pontis igbt Q on first 1during shutoff, the electric current of three-phase brushless dc motor 4 is by single-phase rectification bridge Z 3, igbt igbt fast acting fuse F 4and diode formed continuous current circuit, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals zero.As can be seen here, brachium pontis igbt Q on the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis all open a way the 3rd maybe on this on brachium pontis 5with time brachium pontis igbt Q of the 3rd on this lower brachium pontis 2during equal short circuit, due to the fault-tolerant operation of inverter circuit of the present invention, the output performance of three-phase brushless dc motor 4 can't be affected.
2. pipe modulation, upper pipe Heng Tong (HON_LPWM) modulation system is descended
When lower pipe modulation, upper pipe Heng Tong (HON_LPWM) modulation system, three-phase brushless dc motor 4 is operated in the 3rd time brachium pontis igbt Q on the lower brachium pontis of the 3rd inverter bridge leg 2brachium pontis igbt Q in the pwm control signal modulation exported by described external control circuit, the upper brachium pontis of the first inverter bridge leg first 1the state period of Heng Tong.
When without open circuit or short trouble, at the 3rd time brachium pontis igbt Q 2pwm control signal modulation the conducting period, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; At the 3rd time brachium pontis igbt Q 2pwm control signal modulation turn off the period, the 3rd time brachium pontis igbt Q 2cut-off, the voltage being added in the ac phase two ends of three-phase brushless dc motor 4 equals zero.
Brachium pontis igbt Q on the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis all open a way the 3rd maybe on this on brachium pontis 5with time brachium pontis igbt Q of the 3rd on this lower brachium pontis 2during equal short circuit, described external control circuit sends control signal conducting the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3, allow the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q on first 1with the 3rd time brachium pontis igbt Q 260 degree of interval conductings always of work; Described external control circuit stops sending to brachium pontis igbt Q on the 3rd 5with the 3rd time brachium pontis igbt Q 2control signal, meanwhile, described external control circuit controls brachium pontis igbt Q on the 3rd on this on brachium pontis according to it 5control logic during normal work is to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control, because three-phase brushless dc motor 4 is operated in the state that ac phase is energized, therefore when without open circuit or short trouble, described external control circuit is not also to brachium pontis igbt Q on the 3rd 5control, so described external control circuit is not also to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control; Described external control circuit controls the 3rd time brachium pontis igbt Q on this lower brachium pontis according to it 2control logic during normal work is to lower brachium pontis supplementary insulation grid bipolar transistor Q 8control, namely descend brachium pontis supplementary insulation grid bipolar transistor Q 8the pwm control signal modulation exported by described external control circuit, described external control circuit controls brachium pontis igbt Q on first 1heng Tong, as shown in figs. 7 a and 7b, Fig. 7 a is the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis is all opened a way or brachium pontis igbt Q on the 3rd to the fault-tolerant operation situation of inverter circuit of the present invention 5with the 3rd time brachium pontis igbt Q 2equal short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q in Heng Tong, first 1heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8current circuit figure during conducting, Fig. 7 b are the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis is all opened a way or brachium pontis igbt Q on the 3rd 5with the 3rd time brachium pontis igbt Q 2equal short circuit, the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3brachium pontis igbt Q in Heng Tong, first 1heng Tong, lower brachium pontis supplementary insulation grid bipolar transistor Q 8current circuit figure during shutoff.
As can be seen from Fig. 7 a, when external control circuit controls lower brachium pontis supplementary insulation grid bipolar transistor Q 8during conducting, the positive pole of DC power supply 1 is through fast acting fuse F 1and igbt the a phase being added to three-phase brushless dc motor 4 is held, and the negative pole of DC power supply 1 is through igbt single-phase rectification bridge Z 3with the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3the c phase being added to three-phase brushless dc motor 4 is held, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals the voltage E of DC power supply 1; As can be seen from Fig. 7 b, when external control circuit controls lower brachium pontis supplementary insulation grid bipolar transistor Q 8during shutoff, the electric current of three-phase brushless dc motor 4 is by single-phase rectification bridge Z 3, igbt diode fast acting fuse F1 and igbt formed continuous current circuit, with without open a way or short trouble time the same, the voltage at the ac phase two ends of three-phase brushless dc motor 4 equals zero.As can be seen here, brachium pontis igbt Q on the upper brachium pontis of the 3rd inverter bridge leg and lower brachium pontis all open a way the 3rd maybe on this on brachium pontis 5with time brachium pontis igbt Q of the 3rd on this lower brachium pontis 2during equal short circuit, due to the fault-tolerant operation of inverter circuit of the present invention, the output performance of three-phase brushless dc motor 4 can't be affected.
In sum, the present invention by connecting fast acting fuse on each brachium pontis of traditional inverter bridge, when there is igbt short trouble, the fast acting fuse on this igbt place brachium pontis will be burnt, achieve the conversion of short trouble to open fault, simultaneously, when single brachium pontis open fault, external control circuit stops exporting control signal to Trouble ticket brachium pontis, single brachium pontis open fault just can not have an impact to reconstruct inverter, achieve the Fault Isolation of open circuit or short trouble place brachium pontis, avoid or reduce the impact of fault on whole system.The present invention by adding inversion auxiliary circuit between DC power supply and inverter bridge, achieve the igbt short circuit on brachium pontis on the open circuit of brachium pontis on inverter bridge list or inverter bridge list, igbt short circuit under inverter bridge list under brachium pontis open circuit or inverter bridge list on brachium pontis, and the upper brachium pontis of an inverter bridge brachium pontis and lower brachium pontis is all opened a way or the equal short circuit of igbt on the upper brachium pontis of an inverter bridge brachium pontis and lower brachium pontis time fault-tolerant operation, do not reduce the load capacity of whole inverter circuit, the performance of inverter circuit load can not be affected, the reliability service of whole system can be ensured.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure change, all still belong in the protection range of technical solution of the present invention.

Claims (4)

1. the fault-tolerant inverter circuit of three-phase, comprise DC power supply (1) and under the control of external control circuit by the inverter bridge (3) of converting direct-current power into alternating-current power, described inverter bridge (3) is made up of the first inverter bridge leg, the second inverter bridge leg and the 3rd inverter bridge leg, the upper brachium pontis of described first inverter bridge leg is connected with brachium pontis igbt Q on first 1, the lower brachium pontis of described first inverter bridge leg is connected with first time brachium pontis igbt Q 4, the upper brachium pontis of described first inverter bridge leg and the link of lower brachium pontis are the first output of inverter bridge (3), the upper brachium pontis of described second inverter bridge leg are connected with brachium pontis igbt Q on second 3, the lower brachium pontis of described second inverter bridge leg is connected with second time brachium pontis igbt Q 6, the upper brachium pontis of described second inverter bridge leg and the link of lower brachium pontis are the second output of inverter bridge (3), the upper brachium pontis of described 3rd inverter bridge leg are connected with brachium pontis igbt Q on the 3rd 5, the lower brachium pontis of described 3rd inverter bridge leg is connected with the 3rd time brachium pontis igbt Q 2, the upper brachium pontis of described 3rd inverter bridge leg and the link of lower brachium pontis are the 3rd output of inverter bridge (3); It is characterized in that: the upper brachium pontis of described first inverter bridge leg is connected with first on brachium pontis igbt Q 1series connection and for by brachium pontis igbt Q on first 1short trouble be converted to the fast acting fuse F of the upper brachium pontis open fault of the first inverter bridge leg 1, the lower brachium pontis of described first inverter bridge leg is connected with and first time brachium pontis igbt Q 4series connection and for by first time brachium pontis igbt Q 4short trouble be converted to the fast acting fuse F of the lower brachium pontis open fault of the first inverter bridge leg 4, the upper brachium pontis of described second inverter bridge leg is connected with second on brachium pontis igbt Q 3series connection and for by brachium pontis igbt Q on second 3short trouble be converted to the fast acting fuse F of the upper brachium pontis open fault of the second inverter bridge leg 3, the lower brachium pontis of described second inverter bridge leg is connected with and second time brachium pontis igbt Q 6be in series with for by second time brachium pontis igbt Q 6short trouble be converted to the fast acting fuse F of the lower brachium pontis open fault of the second inverter bridge leg 6, the upper brachium pontis of described 3rd inverter bridge leg is connected with the 3rd on brachium pontis igbt Q 5series connection and for by brachium pontis igbt Q on the 3rd 5short trouble be converted to the fast acting fuse F of the upper brachium pontis open fault of the 3rd inverter bridge leg 5, the lower brachium pontis of described 3rd inverter bridge leg is connected with and the 3rd time brachium pontis igbt Q 2series connection and for by the 3rd time brachium pontis igbt Q 2short trouble be converted to the fast acting fuse F of the lower brachium pontis open fault of the 3rd inverter bridge leg 2; Be connected with the inversion auxiliary circuit (2) for making inverter bridge (3) fault-tolerant operation under the control of external control circuit between described DC power supply (1) and inverter bridge (3), described inversion auxiliary circuit (2) is by upper brachium pontis supplementary insulation grid bipolar transistor Q 7, lower brachium pontis supplementary insulation grid bipolar transistor Q 8, the first inverter bridge leg supplementary insulation grid bipolar transistor S 1, the second inverter bridge leg supplementary insulation grid bipolar transistor S 2with the 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3, and single-phase rectification bridge Z 1, single-phase rectification bridge Z 2with single-phase rectification bridge Z 3composition; Described upper brachium pontis supplementary insulation grid bipolar transistor Q 7collector electrode connect with the positive pole of DC power supply (1), described upper brachium pontis supplementary insulation grid bipolar transistor Q 7emitter and lower brachium pontis supplementary insulation grid bipolar transistor Q 8collector electrode connect, described lower brachium pontis supplementary insulation grid bipolar transistor Q 8emitter connect with the negative pole of DC power supply (1), described single-phase rectification bridge Z 1an ac input end, single-phase rectification bridge Z 2an ac input end and single-phase rectification bridge Z 3an ac input end all with upper brachium pontis supplementary insulation grid bipolar transistor Q 7emitter and lower brachium pontis supplementary insulation grid bipolar transistor Q 8the link of collector electrode connect, described single-phase rectification bridge Z 1another ac input end connect with the first output of inverter bridge (3), described single-phase rectification bridge Z 2another ac input end connect with the second output of inverter bridge (3), described single-phase rectification bridge Z 3another ac input end connect with the 3rd output of inverter bridge (3), described first inverter bridge leg supplementary insulation grid bipolar transistor S 1collector electrode and single-phase rectification bridge Z 1cathode output end connect, described first inverter bridge leg supplementary insulation grid bipolar transistor S 1emitter and single-phase rectification bridge Z 1cathode output end connect, described second inverter bridge leg supplementary insulation grid bipolar transistor S 2collector electrode and single-phase rectification bridge Z 2cathode output end connect, described second inverter bridge leg supplementary insulation grid bipolar transistor S 2emitter and single-phase rectification bridge Z 2cathode output end connect, described 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3collector electrode and single-phase rectification bridge Z 3cathode output end connect, described 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3emitter and single-phase rectification bridge Z 3cathode output end connect.
2. according to the fault-tolerant inverter circuit of a kind of three-phase according to claim 1, it is characterized in that: brachium pontis igbt Q on described first 1by antiparallel igbt and diode composition, described first time brachium pontis igbt Q 4by antiparallel igbt and diode composition, brachium pontis igbt Q on described second 3by antiparallel igbt and diode composition, described second time brachium pontis igbt Q 6by antiparallel igbt and diode composition, brachium pontis igbt Q on the described 3rd 5by antiparallel igbt and diode composition, described 3rd time brachium pontis igbt Q 2by antiparallel igbt and diode composition, described upper brachium pontis supplementary insulation grid bipolar transistor Q 7by antiparallel igbt and diode composition, described lower brachium pontis supplementary insulation grid bipolar transistor Q 8by antiparallel igbt and diode composition, described first inverter bridge leg supplementary insulation grid bipolar transistor S 1by antiparallel igbt and diode composition, described second inverter bridge leg supplementary insulation grid bipolar transistor S 2by antiparallel igbt and diode composition, described 3rd inverter bridge leg supplementary insulation grid bipolar transistor S 3by antiparallel igbt and diode composition.
3., according to the fault-tolerant inverter circuit of a kind of three-phase according to claim 2, it is characterized in that: described diode diode diode diode diode diode diode diode diode diode and diode be fast recovery diode or high-frequency diode.
4. a control method for the fault-tolerant inverter circuit of three-phase as claimed in claim 1, is characterized in that the method comprises the following steps:
Step one, when on xth inverter bridge leg brachium pontis open circuit or xth inverter bridge leg on igbt short circuit time, described external control circuit sends control signal conducting xth inverter bridge leg supplementary insulation grid bipolar transistor S x; Wherein, the value of x is 1,2 or 3;
Step 2, judge it is the igbt short circuit of upper brachium pontis open circuit maybe on this on brachium pontis of xth inverter bridge leg, or the igbt short circuit of the lower brachium pontis open circuit of xth inverter bridge leg maybe on this lower brachium pontis, or the upper brachium pontis of xth inverter bridge leg and lower brachium pontis are all opened a way the igbt maybe on this on brachium pontis and the equal short circuit of igbt on this lower brachium pontis;
When the igbt short circuit maybe on this on brachium pontis of the upper brachium pontis open circuit of xth inverter bridge leg, described external control circuit stops the control signal sending the igbt on brachium pontis on this, meanwhile, control logic when described external control circuit normally works according to its igbt controlled on this on brachium pontis is to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control;
When the igbt short circuit maybe on this lower brachium pontis of the lower brachium pontis open circuit of xth inverter bridge leg, described external control circuit stops the control signal sending the igbt on this lower brachium pontis, meanwhile, control logic when described external control circuit normally works according to its igbt controlled on this lower brachium pontis is to lower brachium pontis supplementary insulation grid bipolar transistor Q 8control;
When the upper brachium pontis of xth inverter bridge leg and lower brachium pontis all open a way the igbt maybe on this on brachium pontis and the equal short circuit of the igbt on this lower brachium pontis, described external control circuit stops the control signal sending the igbt on the igbt on brachium pontis on this and this lower brachium pontis, meanwhile, control logic when described external control circuit normally works according to its igbt controlled on this on brachium pontis is to upper brachium pontis supplementary insulation grid bipolar transistor Q 7control, control logic when described external control circuit normally works according to its igbt controlled on this lower brachium pontis is to lower brachium pontis supplementary insulation grid bipolar transistor Q 8control.
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