CN209046547U - A kind of three-phase inverter - Google Patents
A kind of three-phase inverter Download PDFInfo
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- CN209046547U CN209046547U CN201821865018.8U CN201821865018U CN209046547U CN 209046547 U CN209046547 U CN 209046547U CN 201821865018 U CN201821865018 U CN 201821865018U CN 209046547 U CN209046547 U CN 209046547U
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Abstract
A kind of three-phase inverter, it include: direct current input source, switching circuit, the first coupling inductance, the second coupling inductance and third coupling inductance, the positive and negative input terminal of switching circuit is connected with the positive and negative end of direct current input source respectively, switching circuit has the first output end, second output terminal and third output end, the switching circuit accesses threephase load by the first coupling inductance, the second coupling inductance and third coupling inductance, further includes first capacitor, the second capacitor and third capacitor；First coupling inductance, second coupling inductance and the third coupling inductance respectively have main coil and ancillary coil.The utility model generates induced electromotive force using coupling inductance, and matching corresponding capacitor, the induced electromotive force of coupling inductance are added in capacitor both ends and then form compensation electric current, compensation electric current is introduced into leakage current circuit, leakage current is compensated, to reduce leakage current and EMI.
Description
Technical field
The utility model relates to inverter technology field more particularly to a kind of three-phase inverters.
Background technique
In the parallel network reverse of the application of middle low power parallel network reverse, especially three phase full bridge, in order to improve conversion effect
Rate mostly uses greatly non-isolated transformer device structure.Non-isolation type photovoltaic three-phase inverter possesses high-efficient, body compared to isolated form structure
Accumulate the advantages such as small, light-weight and at low cost.But due to three-phase inverter direct-flow input end such as photovoltaic battery panel parasitic capacitance over the ground
Presence, when inverter work when parasitic capacitance and photovoltaic battery panel, inverter, power grid (one kind that may be considered load) it
Between formed a common mode circuit, the variation of common-mode voltage can cause the variation of capacitor charge and discharge, (i.e. total so as to form leakage current
Mould electric current, as shown in Figure 1), the generation of leakage current can bring the increase of conduction and radiation interference, grid current harmonic wave and loss,
Even jeopardize equipment and personnel safety.
In the prior art, it is disclosed application No. is 201810107920.1 Chinese patent application and a kind of single-phase solves to leak
The gird-connected inverter (as shown in Figure 2) of current problems, but the solution of three-phase inverter is not referred to, in addition, due to three contraries
Become device when accessing other load (such as resistive load, capacitive load, inductive load, RCD are carried), DC source (such as photovoltaic electric
Pond plate), inverter and other load between also will form common mode circuit, equally with the presence of leakage current.Three-phase inverter with it is single-phase
Inverter is compared, and since its output is three-phase, during the work time, leakage current is mainly caused by three-phase imbalance, is solving to leak
It, need to be from the purpose for realizing three-phase equilibrium, to solve current leakage when current problems.
Utility model content
The purpose of the utility model is to provide the three-phase inverters that a kind of structure is simply able to solve current leakage.
In order to achieve the above objectives, the technical solution adopted in the utility model is:
A kind of three-phase inverter, comprising: direct current input source, switching circuit, the first coupling inductance, the second coupling inductance and
Three coupling inductances, the positive and negative input terminal of switching circuit are connected with the positive and negative end of direct current input source respectively, and switching circuit has first
Output end, second output terminal and third output end, the first output end of switching circuit, second output terminal and third output end pass through respectively
The first load of the first coupling inductance, the second coupling inductance and the access of third coupling inductance, the second load and third load are crossed, it is special
Sign is, further includes first capacitor, the second capacitor and third capacitor；First coupling inductance, the second coupling inductance and third coupling
Inductance respectively has main coil and ancillary coil；
One end of first coupling inductance main coil, one end of the first coupling inductance ancillary coil and switching circuit it is first defeated
Outlet connects, and one end of the other end of the first coupling inductance main coil and the first load connects；
One end of second coupling inductance main coil, one end of the second coupling inductance ancillary coil and switching circuit it is second defeated
Outlet connects, and one end of the other end of the second coupling inductance main coil and the second load connects；
The third of one end of third coupling inductance main coil, one end of third coupling inductance ancillary coil and switching circuit is defeated
Outlet connects, and one end of the other end and the third load of third coupling inductance main coil connects；
The other end of first load, the other end of the second load and the third load other end are connected to neutral point jointly, and first
One end of one end of capacitor, one end of the second capacitor and third capacitor is connected to a current potential dead point jointly, first capacitor it is another
End, the other end of the second capacitor and third capacitor the other end be connected to the other end of the first coupling inductance ancillary coil, the respectively
The other end of two coupling inductance ancillary coils and the other end of third coupling inductance ancillary coil.
Further, the other end of the first coupling inductance main coil, the other end of the second coupling inductance main coil and with
The other end of three coupling inductance main coils is connected with the 4th capacitor, the 5th capacitor and the 6th electricity between neutral point neutral point respectively
Hold, the first load, the second load, third load are in capacitive load, inductive load, resistive load, RCD load or AC network
It is any.
Further, further include the 4th inductance, the 5th inductance, the 6th inductance, be connected to the first coupling inductance main coil respectively
The other end and first load one end between, the other end of the second coupling inductance main coil and second load one end between,
Between one end of the other end and the third load of third coupling inductance main coil.
Further, switching circuit is the framework using six switching tubes, and six switching tubes are respectively first switch tube, the
Two switching tubes, third switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube, first switch tube and second switch
Between the positive and negative terminal for mutually concatenating and being connected to direct current input source, third switching tube and the 4th switching tube mutually concatenate and are connected to direct current
Between the positive and negative terminal of input source, the 5th switching tube and the 6th switching tube mutually concatenate and are connected to the positive and negative of the direct current input source
Between end, the common end of first switch tube and second switch is the first output end of switching circuit, third switching tube and the 4th
The common end of switching tube is the second output terminal of switching circuit, and the 5th switching tube and the common of the 6th switching tube are held as switching circuit
Third output end.
Further, six switching tubes are triode and the diode for being connected anti-parallel to triode.
Further, six switching tubes are MOSFET and the diode for being connected anti-parallel to MOSFET.
Further, six switching tubes are IGBT and the diode for being connected anti-parallel to IGBT.
Further, switching circuit is the IGBT module of six pipes encapsulation.
Further, switching circuit is five level framework of three-phase tri-level framework or three-phase.
Further, between the first coupling inductance and the first load, between the second coupling inductance and the second load, Yi Ji
Also there is EMI filter circuit between three coupling inductances and third load, three input terminals of EMI filter circuit connect the first coupling respectively
The other end, the other end of the second coupling inductance main coil and the other end of third coupling inductance main coil of inductance main coil are closed,
Three output ends of EMI filter circuit connect one end of one end of the first load, one end of the second load and third load respectively.
The beneficial effects of the utility model are the three-phase inverter of the utility model, utilize the first, second, and third coupling
Inductance generates induced electromotive force, and matching corresponding first, second, and third capacitor, the first coupling inductance, the second coupling
Inductance, third coupling inductance both ends induced electromotive force be added in first capacitor both ends, the second capacitor both ends and third capacitor respectively
Both ends, and then compensation electric current is formed, compensation electric current is introduced into leakage current circuit, compensate to leakage current (should illustrate herein
Where is leakage current circuit, our which wiring, which can embody, is introduced into compensation electric current in leakage current circuit.Otherwise we are herein
It is like to claim and asserting, and there is no for combination technology scheme for beneficial effect), to reduce leakage current and EMI, make
Leakage current reaches in safe range, improves the safety of entire inverter.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is a kind of three-phase photovoltaic grid-connected inverting device in the prior art.
Fig. 2 is a kind of single-phase grid-connected inverter in the prior art.
Fig. 3 is a kind of one electrical block diagram of three-phase inverter embodiment of the utility model.
Fig. 4 is a kind of two electrical block diagram of three-phase inverter embodiment of the utility model.
Fig. 5 is a kind of three-phase inverter embodiment three-circuit structural schematic diagram of the utility model.
Fig. 6 is a kind of three-phase inverter example IV electrical block diagram of the utility model.
Fig. 7 is a kind of five electrical block diagram of three-phase inverter embodiment of the utility model.
Fig. 8 is a kind of six electrical block diagram of three-phase inverter embodiment of the utility model.
Fig. 9 is the circuit of the common mode current U and compensation electric current U in a kind of three-phase inverter embodiment one of the utility model
Schematic diagram.
Figure 10 is time of the common mode current V and compensation electric current V in a kind of three-phase inverter embodiment one of the utility model
Road schematic diagram.
Figure 11 is time of the common mode current W and compensation electric current W in a kind of three-phase inverter embodiment one of the utility model
Road schematic diagram.
Figure 12 is a kind of seven electrical block diagram of three-phase inverter embodiment of the utility model.
Figure 13 is a kind of eight electrical block diagram of three-phase inverter embodiment of the utility model.
Figure 14 is a kind of nine electrical block diagram of three-phase inverter embodiment of the utility model.
Figure 15 is a kind of ten electrical block diagram of three-phase inverter embodiment of the utility model.
Figure 16 is a kind of 11 electrical block diagram of three-phase inverter embodiment of the utility model.
Figure 17 is a kind of 12 electrical block diagram of three-phase inverter embodiment of the utility model.
Figure 18 is time of the common mode current U and compensation electric current U ' in a kind of three-phase inverter embodiment seven of the utility model
Road schematic diagram.
Figure 19 is time of the common mode current V and compensation electric current V ' in a kind of three-phase inverter embodiment seven of the utility model
Road schematic diagram.
Figure 20 is time of the common mode current W and compensation electric current W ' in a kind of three-phase inverter embodiment seven of the utility model
Road schematic diagram.
Figure 21 is that a kind of embodiment one of three-phase inverter of the utility model is electric to one of embodiment 12 switch
Line structure schematic diagram.
In figure: direct current input source -1, switching circuit -2, first switch tube -201, second switch -202, third switch
Pipe -203, five switching tube -205, the of the 4th switching tube -204, the, six switching tube -206, the first coupling inductance -3, the second coupling electricity
Sense -4, third coupling inductance -5,301- the first coupling inductance ancillary coil, 302- the first coupling inductance main coil, 401- second
Coupling inductance ancillary coil, 402- the second coupling inductance main coil, 501- third coupling inductance ancillary coil, the coupling of 502- third
Inductance main coil, first capacitor -6, the second capacitor -7, four capacitor -9, the of third capacitor -8, the, five capacitor -10, the, six capacitor -
11, the first load -14, the second load -13, third load -12, four inductance -16, the of EMI filter circuit -15, the, five inductance -
17, the 6th inductance -18.
Specific embodiment
Embodiment one
Embodiment one as shown in Figure 3, the three-phase inverter of the utility model, comprising: direct current input source 1, switching circuit
2, the first coupling inductance 3, the second coupling inductance 4 and third coupling inductance 5, the positive and negative input terminal of switching circuit 2 respectively with direct current
Positive (+) of input source 1, negative (-) end are connected, and switching circuit 2 has the first output terminals A, second output terminal B and third output end C,
The first output terminals A, second output terminal B and the third output end C of switching circuit 2 pass through the coupling of the first coupling inductance 3, second respectively
Inductance 4 and third coupling inductance 5 access threephase load, i.e., first the 14, second load 13 of load and third load 12, this is practical new
The three-phase inverter of type further includes first capacitor 6, the second capacitor 7 and third capacitor 8；First coupling inductance 3, the second coupling inductance
4 and third coupling inductance 5 respectively have main coil and ancillary coil；
One end of first coupling inductance main coil 302, one end of the first coupling inductance ancillary coil 301 and switching circuit 2
The first output terminals A connect, the other end of the first coupling inductance main coil 302 and first load 14 one end connect；
One end of second coupling inductance main coil 402, one end of the second coupling inductance ancillary coil 401 and switching circuit 2
Second output terminal B connect, the other end of the second coupling inductance main coil 402 and second load 13 one end connect；
One end of third coupling inductance main coil 502, one end of third coupling inductance ancillary coil 501 and switching circuit 2
Third output end C connect, one end of the other end and third of third coupling inductance main coil 502 load 12 connects；
The other end of first load 14, the other end of the second load 13 and third load 12 other ends and are connected to neutral point jointly
Neutral point N, first capacitor 6 be connected to the first coupling inductance ancillary coil 301 the other end and switching circuit 2 negative input end it
Between；Second capacitor 7 is connected between the other end of the second coupling inductance ancillary coil 401 and the negative input end of switching circuit 2, third
Capacitor 8 is connected between 2 negative input end of the other end and switching circuit of third coupling inductance ancillary coil 501.
First loads other than it can be three-phase AC grid to third, can also be capacitive load, inductive load, resistance
Property load, RCD load etc. any one of.
The three-phase inverter of the present embodiment one, in the case where switching circuit works in high frequency situations, due to three-phase imbalance, such as
Common mode current U (see the dotted line in Fig. 9) is generated in the negative terminal of the first load 14 and DC supply input 1, then the first coupling inductance
Ancillary coil 301 generates induced electromotive force, is added in the both ends of first capacitor 6, switching circuit 2, the first coupling inductance ancillary coil
301, the negative terminal of first capacitor 6 and DC supply input 1 forming circuit generates compensation electric current U (see the solid line in Fig. 9), with common mode
Electric current U's is contrary, it can compensates to leakage current, to reduce leakage current and EMI, leakage current is made to reach safety
In range, the safety of entire three-phase inverter is improved.
Similarly, negative terminal generation common mode current V (see the dotted line in Figure 10) for loading 13 and DC supply input 1 when second,
Then the second coupling inductance ancillary coil 401 generates induced electromotive force, is added in the both ends of the second capacitor 7, switching circuit 2, the second coupling
The negative terminal forming circuit for closing inductance ancillary coil 401, the second capacitor 7 and DC supply input 1 generates compensation electric current V (see Figure 10
In solid line), it is contrary with common mode current V, it can leakage current is compensated, to reduce leakage current and EMI,
Reach leakage current in safe range, improves the safety of entire three-phase inverter.
And when the negative terminal of third load 12 and DC supply input 1 generates common mode current W (see the dotted line in Figure 11), then the
Three coupling inductance ancillary coils 501 generate induced electromotive force, are added in the both ends of third capacitor 8, switching circuit 2, third coupling electricity
The negative terminal forming circuit for feeling ancillary coil 501, third capacitor 8 and DC supply input 1 generates compensation electric current W (see in Figure 11
Solid line), it is contrary with common mode current W, it can leakage current is compensated, to reduce leakage current and EMI, makes to leak
Electric current reaches in safe range, improves the safety of entire three-phase inverter.
Embodiment two
The three-phase inverter of embodiment two as shown in Figure 4, compared with embodiment one shown in Fig. 3, the first coupling inductance
The 4th capacitor 9 is connected between the other end and neutral point N of main coil 302, the other end of the second coupling inductance main coil 402 is in
Property point N between be connected to the 5th capacitor 10, the 6th electricity is connected between the other end and neutral point N of third coupling inductance main coil 502
Appearance 11, the first coupling inductance main coil 302 and the 4th capacitor 9, the second coupling inductance main coil 402 and the 5th capacitor 10, third
Coupling inductance main coil 502 and the 6th capacitor 9 respectively constitute LC type inversion output filter.
Compared to the three-phase inverter of embodiment one, it is more preferable that the three-phase inverter of embodiment two filters out high-frequency noise ability.
Embodiment three
The three-phase inverter of embodiment three as shown in Figure 5, compared with embodiment two shown in Fig. 4, the first coupling inductance
The 4th inductance 16, the second coupling inductance main coil 402 are further connected between the other end of main coil 302 and one end of the first load 14
The other end and second load 13 one end between be further connected with the 5th inductance 17, the other end of third coupling inductance main coil 502
The 6th inductance 18 is further connected between one end of third load 12.
Wherein, the first coupling inductance main coil 302, the 4th capacitor 9 and the 4th inductance 16, the second coupling inductance main coil
402, the 5th capacitor 10 and the 5th inductance 17, third coupling inductance main coil 502, the 6th capacitor 9 and the 6th inductance 18 distinguish structure
At LCL type inversion output filter.
Compared to the three-phase inverter of embodiment two, the three-phase inverter output end current dynamic property of embodiment three is more
It is good.
Example IV
The three-phase inverter of example IV as shown in FIG. 6, compared with embodiment one shown in Fig. 3, the first coupling inductance
3, the second coupling inductance 4 and threephase load also have EMI filter circuit 15, and three input terminals of EMI filter circuit 15 connect respectively
The other end of first coupling inductance main coil 302, the other end of the second coupling inductance main coil 402 and third coupling inductance main line
The other end of circle 502, three output ends of EMI filter circuit 15 connect one end of threephase load respectively, i.e., connect the first load respectively
14, one end of the second load 13 and third load 12.
Compared to the three-phase inverter of embodiment one, the three-phase inverter of example IV increases EMI filter circuit 15, and three
The EMI filter capacity of phase inverter is more preferable.
Embodiment five
The three-phase inverter of embodiment five as shown in Figure 7, compared with embodiment illustrated in fig. 4 two, the first coupling inductance 3, the
Two coupling inductances 4 and threephase load also have EMI filter circuit 15, and three input terminals of EMI filter circuit 15 connect first respectively
The other end of coupling inductance main coil 302, the other end of the second coupling inductance main coil 402 and third coupling inductance main coil
502 other end, three output ends of EMI filter circuit 15 connect one end of threephase load respectively, i.e., connect respectively the first load 14,
One end of second load 13 and third load 12.
Compared to the three-phase inverter of embodiment one, the three-phase inverter of embodiment five increases the 9, the 5th electricity of the 4th capacitor
Appearance 10 and the 6th capacitor 11 and EMI filter circuit 15, three-phase inverter filter out high-frequency noise ability and EMI filter capacity more
It is good.
Embodiment six
The three-phase inverter of embodiment six as shown in Figure 8, compared with embodiment illustrated in fig. 7 five, the first coupling inductance main line
It is further connected with the 4th inductance 16 between the other end of circle 302 and one end of the first load 14, the second coupling inductance main coil 402
Be further connected with the 5th inductance 17 between the other end and one end of the second load 13, the other end of third coupling inductance main coil 502 and
The 6th inductance 18 is further connected between one end of third load 12.
Wherein, the first coupling inductance main coil 302, the 4th capacitor 9 and the 4th inductance 16, the second coupling inductance main coil
402, the 5th capacitor 10 and the 5th inductance 17, third coupling inductance main coil 502, the 6th capacitor 9 and the 6th inductance 18 distinguish structure
At LCL type inversion output filter.
Compared to the three-phase inverter of embodiment five, the three-phase inverter output end current dynamic property of embodiment six is more
It is good.
Embodiment seven is to embodiment 12
Such as Figure 12, Figure 13, Figure 14, Figure 15, Figure 16, embodiment illustrated in fig. 17 seven, embodiment eight, embodiment nine, embodiment
Ten, the three-phase inverter of embodiment 11, embodiment 12, respectively with Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, embodiment illustrated in fig. 8
One, embodiment two, embodiment three, example IV, embodiment five, embodiment six are compared, and difference is, embodiment seven, embodiment
Eight, in the three-phase inverter of embodiment nine, embodiment ten, embodiment 11, embodiment 12, first capacitor 6 is connected to the first coupling
It closes between the other end of inductance ancillary coil 301 and the positive input terminal of switching circuit 2；Second capacitor 7 is connected to the second coupling inductance
Between the other end of ancillary coil 401 and the positive input terminal of switching circuit 2, third capacitor 8 is connected to third coupling inductance auxiliary line
Between 2 positive input terminal of the other end and switching circuit of circle 501.
Wherein, in embodiment one into embodiment 12, the positive input terminal of switching circuit 2 or the negative input of switching circuit 2
End is a current potential dead point, i.e. the current potential of the negative input end of the current potential of the positive input terminal of switching circuit 2 or switching circuit 2, phase
It is all constant for negative (-) end of direct current input source 1.
The three-phase inverter of embodiment seven, in the case where switching circuit works in high frequency situations, due to three-phase imbalance, such as
The negative terminal of first load 14 and DC supply input 1 generates common mode current U (see the dotted line in Figure 18), then the first coupling inductance is auxiliary
Index contour circle 301 generates induced electromotive force, is added in the both ends of first capacitor 6, the anode of DC supply input 1, switching circuit 2, the
One coupling inductance ancillary coil 301, the forming circuit of first capacitor 6 generate compensation electric current U ' (see the solid line in Figure 18), with common mode
Electric current U's is contrary, it can compensates to leakage current, to reduce leakage current and EMI, leakage current is made to reach safety
In range, the safety of entire three-phase inverter is improved.
Similarly, negative terminal generation common mode current V (see the dotted line in Figure 19) for loading 13 and DC supply input 1 when second,
Then the second coupling inductance ancillary coil 401 generates induced electromotive force, is added in the both ends of the second capacitor 7, DC supply input 1
Anode, switching circuit 2, the second coupling inductance ancillary coil 401, the second capacitor 7 forming circuit generate compensation electric current V ' (see figure
Solid line in 19), it is contrary with common mode current V, it can leakage current is compensated, thus reduce leakage current and
EMI reaches leakage current in safe range, improves the safety of entire three-phase inverter.
And when the negative terminal of third load 12 and DC supply input 1 generates common mode current W (see the dotted line in Figure 20), then the
Three coupling inductance ancillary coils 501 generate induced electromotive force, are added in the both ends of third capacitor 8, the anode of DC supply input 1,
Switching circuit 2, third coupling inductance ancillary coil 501, the forming circuit of third capacitor 8 generate compensation electric current W ' (see in Figure 20
Solid line), it is contrary with common mode current W, it can leakage current is compensated, to reduce leakage current and EMI, makes to leak
Electric current reaches in safe range, improves the safety of entire three-phase inverter.
In the present embodiment one in the three-phase inverter into embodiment 12, it is preferable that the switching circuit 2 is three-phase H6
Framework, as shown in figure 21, six switching tubes are respectively first switch tube 201, second switch 202, third switching tube 203,
Four switching tubes 204, the 5th switching tube 205 and the 6th switching tube 206, first switch tube 201 and second switch 202 mutually concatenate simultaneously
It is connected between the positive and negative terminal of direct current input source 1, third switching tube 203 mutually concatenates with the 4th switching tube 204 and is connected to direct current
Between the positive and negative terminal of input source 1, the 5th switching tube 205 mutually concatenates with the 6th switching tube 206 and is connected to the 1 of direct current input source
Between positive and negative terminal, the common end of first switch tube 201 and second switch 201 is the first output terminals A of switching circuit 2, third
The common end of switching tube 203 and the 4th switching tube 204 is the second output terminal B of switching circuit 2, the 5th switching tube 205 and the 6th
The common end of switching tube 206 is the third output end C of switching circuit 2.
Preferably, switching tube 201-206 is triode and the diode for being connected anti-parallel to triode in Figure 21.
Preferably, switching tube 201-206 is MOSFET and the diode for being connected anti-parallel to MOSFET in Figure 21.
Preferably, switching tube 201-206 is IGBT and the diode for being connected anti-parallel to IGBT in Figure 21.
Alternatively, the IGBT module of six pipes encapsulation, compared with discrete IGBT, IGBT module can be used in switching circuit 2
With easy driving, the series of advantages such as switch control is easy, switch change-over rate is fast, power loss is small.
Switching circuit 2, can be with three-phase tri-level framework, five level of three-phase other than three-phase H6 framework as shown in figure 21
Framework etc., current potential dead point can also be other than it can be the positive input terminal of switching circuit 2 or the negative input end of switching circuit 2
Other points (such as neutral voltage point) in switching circuit, as long as negative (-) end of the current potential of the point relative to direct current input source 1
It is constant or changed with Frequency,
Specific embodiment of the utility model described in detail above.It is to be understood that the embodiments of the present invention
It is not limited to these embodiments, the description of these embodiments is only used for the spirit for helping to understand the utility model.It is practical at this
Under novel revealed spirit, to various change made by the utility model, should all it be included in the scope of the utility model.This
The scope of patent protection of utility model should be defined by the appended claims.
Claims (9)
1. a kind of three-phase inverter, comprising: direct current input source, switching circuit, the first coupling inductance, the second coupling inductance and third
Coupling inductance, the positive and negative input terminal of the switching circuit are connected with the positive and negative end of direct current input source respectively, the switching circuit tool
There are the first output end, second output terminal and third output end, first output end of switching circuit, second output terminal and third are defeated
Outlet passes through the first load of the first coupling inductance, the second coupling inductance and the access of third coupling inductance, the second load and the respectively
Three loads, which is characterized in that further include first capacitor, the second capacitor and third capacitor；First coupling inductance, described second
Coupling inductance and the third coupling inductance respectively have main coil and ancillary coil；
One end of the first coupling inductance main coil, one end of the first coupling inductance ancillary coil and the switching circuit
The first output end connect, the other end of the first coupling inductance main coil and first load one end connect；
One end of the second coupling inductance main coil, one end of the second coupling inductance ancillary coil and the switching circuit
Second output terminal connect, the other end of the second coupling inductance main coil and second load one end connect；
One end of the third coupling inductance main coil, one end of the third coupling inductance ancillary coil and the switching circuit
Third output end connect, one end of the other end and third of the third coupling inductance main coil load connects；
The other end of first load, the other end of second load and the third load other end are connected to neutrality jointly
One end of point, one end of the first capacitor, one end of second capacitor and the third capacitor is connected to a current potential jointly
The other end of dead point, the other end of the first capacitor, the other end of second capacitor and the third capacitor is connected to respectively
The other end and the third coupling of the other end of the first coupling inductance ancillary coil, the second coupling inductance ancillary coil
Close the other end of inductance ancillary coil；
The other end of the first coupling inductance main coil, the other end of the second coupling inductance main coil and and the third
The other end of coupling inductance main coil is connected with the 4th capacitor, the 5th capacitor and the 6th capacitor between neutral point respectively, described
First load, the second load, third load are in capacitive load, inductive load, resistive load, RCD load or AC network
It is any.
2. three-phase inverter according to claim 1, it is characterised in that: further include the 4th inductance, the 5th inductance, the 6th electricity
Sense is connected between the other end of the first coupling inductance main coil and one end of the first load, the second coupling inductance main coil respectively
The other end and second load one end between, the other end of third coupling inductance main coil and third load one end between.
3. according to claim 1 to 2 described in any item three-phase inverters, which is characterized in that the switching circuit is using six
The framework of a switching tube, six switching tubes are respectively first switch tube, second switch, third switching tube, the 4th open
Guan Guan, the 5th switching tube and the 6th switching tube, the first switch tube and the second switch are mutually concatenated and are connected to
Between the positive and negative terminal of the direct current input source, the third switching tube is mutually concatenated and is connected to the 4th switching tube
Between the positive and negative terminal of the direct current input source, the 5th switching tube is mutually concatenated and is connected to the 6th switching tube
Between the positive and negative terminal of the direct current input source, the common end of the first switch tube and the second switch is described
The common end of first output end of switching circuit, the third switching tube and the 4th switching tube is the switching circuit
Second output terminal, the common end of the 5th switching tube and the 6th switching tube is that the third of the switching circuit is defeated
Outlet.
4. three-phase inverter according to claim 3, which is characterized in that six switching tubes are triode and reversed
It is parallel to the diode of the triode.
5. three-phase inverter according to claim 3, which is characterized in that six switching tubes are MOSFET and reversed
It is parallel to the diode of the MOSFET.
6. three-phase inverter according to claim 3, which is characterized in that six switching tubes be IGBT and it is reversed simultaneously
It is coupled to the diode of the IGBT.
7. three-phase inverter according to claim 3, which is characterized in that the switching circuit is the IGBT mould of six pipes encapsulation
Block.
8. according to claim 1 to 2 described in any item three-phase inverters, which is characterized in that the switching circuit is three-phase three
Five level framework of level framework or three-phase.
9. according to claim 1 to 2 described in any item three-phase inverters, which is characterized in that first coupling inductance and institute
It states between the first load, between second coupling inductance and second load and the third coupling inductance and described
Also there is EMI filter circuit, three input terminals of the EMI filter circuit connect the first coupling electricity respectively between third load
Feel the another of the other end of main coil, the other end of the second coupling inductance main coil and the third coupling inductance main coil
End, three output ends of the EMI filter circuit meet one end of first load, one end of second load and institute respectively
State one end of third load.
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