CN206370783U - Combining inverter and inversion system - Google Patents
Combining inverter and inversion system Download PDFInfo
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- CN206370783U CN206370783U CN201720048482.7U CN201720048482U CN206370783U CN 206370783 U CN206370783 U CN 206370783U CN 201720048482 U CN201720048482 U CN 201720048482U CN 206370783 U CN206370783 U CN 206370783U
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Abstract
The utility model discloses a kind of combining inverter and inversion system.Including：Auxiliary circuit, for providing the first free wheeling path and the second free wheeling path, wherein, auxiliary circuit includes：The first port connection of first switch pipe, source electrode and combining inverter, grid is control end；First diode, positive pole is connected with the drain electrode of first switch pipe；Second switch pipe, drain electrode is connected with the negative pole of the first diode, the second port connection of source electrode and combining inverter, and grid is control end；Second diode, positive pole is connected with the drain electrode of second switch pipe, negative pole is connected with the drain electrode of first switch pipe, wherein, first switch pipe, the first diode and second switch pipe constitute the first free wheeling path, first switch pipe, the second diode and second switch pipe the second free wheeling path of formation, wherein, first port and second port are connected with power network.The utility model solves the ineffective technical problem of inverter.
Description
Technical field
The utility model is related to power domain, in particular to a kind of combining inverter and inversion system.
Background technology
Combining inverter separates from combining inverter and not isolated grid-connected inverter, isolated grid-connected inverter be divided into power frequency every
From and high-frequency isolation.The isolated grid-connected inverter volume of power frequency is big, heavy and efficiency is low；High-frequency isolated grid-connected inverter relative to
Not isolated grid-connected inverter efficiency is relatively low, and the control of high-frequency isolated grid-connected inverter is more complicated.
Wherein, single-phase not isolated grid-connected inverter typically now uses full bridge inverter, such as Fig. 1.It is not isolated grid-connected inverse
Becoming device has bipolar modulation and unipolarity modulation mode of operation：
1. bipolar modulation mode of operation：Such as Fig. 1, when the positive half cycle of power network, S1, S4 are simultaneously turned on, S2, S3 cut-off.Electricity
Flow path is：Vdc+→S1→L1→Grid→L2→S4→Vdc-；When S1, S4 end simultaneously, S2, S3 are simultaneously turned on.Electricity
Flow path is：Grid→L2→D2→C→D3→L1.It is symmetrical with the positive half cycle of power network during power network negative half period, repeat no more herein.
S1, S4, S2, S3 are operated in high frequency, and the loss of bipolar modulation transistor switch is larger, and inverter efficiency is relatively low.
2. unisexuality modulates mode of operation：4 transistors in the full-bridge single-phase inversion topology of unipolarity modulation work, wherein
2 transistors are to be operated in power frequency, and 2 transistors are to be operated in high frequency in addition.Such as Fig. 1, when the positive half cycle of power network, S1, S4 are same
When turn on, S2, S3 cut-off, current path is：Vdc+→S1→L1→Grid→L2→S4→Vdc-；When S1 disconnects, S4 is still
Conducting, and now S2, S3 still keep cut-off, and current path is：Grid→L2→S4→D3→L1.With electricity during power network negative half period
Net positive half cycle symmetrical.
Further, when being modulated using unipolarity, time variant voltage when the high frequency break-make of transistor can produce high frequency in inverter
Act in parasitic capacitance, produce larger common mode leakage current, reduce inverter efficiency, also influence EMC performances.Wherein, parasitic electricity
Appearance is that solar panel has parasitic capacitance to the earth.Time variant voltage is made when the high frequency break-make of transistor can produce high frequency in inverter
With in parasitic capacitance, larger common mode leakage current can be thus produced, inverter efficiency is so reduced, also influences EMC
(Electro Magnetic Compatibility, i.e. electromagnetic compatibility) performance.Alternatively (delete " alternatively "), it is single-phase not every
If worked from combining inverter using bipolar modulation, transistor switch loss is larger, and inverter efficiency is low.If using single
Polar modulation is worked, and due to there is larger common mode leakage current, inverter efficiency can also be reduced, and also influences EMC performances.
For above-mentioned inverter efficiency it is low the problem of, effective solution is not yet proposed at present.
Utility model content
The utility model embodiment provides a kind of combining inverter and inversion system, at least to solve the work of inverter
The low technical problem of efficiency.
According to the one side of the utility model embodiment there is provided a kind of combining inverter, including：Auxiliary circuit, is used
In the first free wheeling path of offer and the second free wheeling path, wherein, the auxiliary circuit includes：First switch pipe, source electrode with it is grid-connected
The first port connection of inverter, grid is control end；First diode, positive pole is connected with the drain electrode of the first switch pipe；
Second switch pipe, drain electrode is connected with the negative pole of first diode, and source electrode is connected with the second port of the combining inverter,
Grid is control end；Second diode, positive pole is connected with the drain electrode of the second switch pipe, negative pole and the first switch pipe
Drain electrode connection, wherein, the first switch pipe, first diode and the second switch pipe constitute the first afterflow road
Footpath, the first switch pipe, second diode and the second switch pipe the second free wheeling path of formation, wherein, it is described
First port and the second port are connected with power network.
Further, the auxiliary circuit also includes：3rd diode, the source electrode of positive pole and the first switch pipe connects
Connect, negative pole is connected with the drain electrode of the first switch pipe；4th diode, positive pole is connected with the source electrode of the second switch pipe,
Negative pole is connected with the drain electrode of the second switch pipe.
Further, the first port is connected by the first inductance with the power network, and the second port passes through second
Inductance is connected with the power network.
Further, the combining inverter also includes：3rd switching tube, drain electrode and the input of combining inverter connect
Connect, source electrode is connected with the drain electrode of the second switch pipe, and grid is control end；4th switching tube, drain electrode and combining inverter
Input is connected, and source electrode is connected with the drain electrode of the first switch pipe, and grid is control end；5th switching tube, drain electrode with it is described
The negative pole of the source electrode connection of second switch pipe, source electrode and dc source is connected, and grid is control end；6th switching tube, drain electrode with
The source electrode connection of the first switch pipe, source electrode is connected with the negative pole of the dc source, and grid is control end.
Further, the combining inverter also includes：5th diode, the drain electrode of negative pole and the 3rd switching tube connects
Connect, positive pole is connected with the source electrode of the 3rd switching tube；6th diode, negative pole is connected with the drain electrode of the 4th switching tube,
Positive pole is connected with the source electrode of the 4th switching tube；7th diode, negative pole is connected with the drain electrode of the 5th switching tube, positive pole
It is connected with the source electrode of the 5th switching tube；8th diode, negative pole is connected with the drain electrode of the 6th switching tube, positive pole and institute
State the source electrode connection of the 6th switching tube.
According to the other side of the utility model embodiment, a kind of inversion system is additionally provided, the inversion system includes：
Above-mentioned combining inverter.
Further, the inversion system also includes：Dc source, the positive pole of the dc source and the parallel network reverse
The positive pole connection of the input of device, the negative pole of the dc source is connected with the negative pole of the input of the combining inverter.
Further, the inversion system also includes：Filter capacitor, one end is connected with the positive pole of the dc source, separately
One end is connected with the negative pole of the dc source.
Further, the dc source includes：Photo-voltaic power supply, wind-force power supply and power-equipment power supply.
Further, the inversion system also includes：First inductance, first end and the first port of the combining inverter
Connection, the second end is connected with the power network；Second inductance, first end is connected with the second port of the combining inverter, and second
End is connected with the power network.
In the utility model embodiment, combining inverter adds auxiliary circuit, for provide the first free wheeling path and
Second free wheeling path, wherein, auxiliary circuit includes：The first port connection of first switch pipe, source electrode and combining inverter, grid
For control end；First diode, positive pole is connected with the drain electrode of first switch pipe；Second switch pipe, drain electrode and the first diode
Negative pole is connected, and the second port of source electrode and combining inverter is connected, and grid is control end；Second diode, positive pole is opened with second
The drain electrode connection of pipe is closed, negative pole is connected with the drain electrode of first switch pipe, wherein, first switch pipe, the first diode and second
Switching tube constitutes the first free wheeling path, and first switch pipe, the second diode and second switch pipe form the second free wheeling path, its
In, first port and second port are connected with power network.In the above-described embodiments, the new transistor with body diode of increase is passed through
And diode so that free wheeling path is different from free wheeling path and unipolarity modulation work when bipolar modulation works when inversion works
When free wheeling path, while free wheeling path diminishes when the inversion is worked, so as to avoid the loss of bipolar modulation transistor switch
Larger problem, alternatively, also inhibits common mode leakage current, improves inverter efficiency and EMC performances, and then solve inverter
Ineffective technical problem.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding to of the present utility model, constitutes the part of the application,
Schematic description and description of the present utility model is used to explain the utility model, does not constitute to of the present utility model improper
Limit.In the accompanying drawings：
Fig. 1 is a kind of schematic diagram of full bridge inverter according to prior art；
Fig. 2 is a kind of new free wheeling path of combining inverter according to the utility model embodiment；
Fig. 3 is a kind of schematic diagram of combining inverter according to the utility model embodiment；
Fig. 4 is the schematic diagram of transistor drive signal in a kind of circuit according to the utility model embodiment；
Fig. 5 is a kind of showing in line voltage positive half period inversion stage current path according to the utility model embodiment
It is intended to；
Fig. 6 is a kind of showing in line voltage positive half period freewheeling period current path according to the utility model embodiment
It is intended to；
Fig. 7 is a kind of showing in line voltage negative half-cycle inversion stage current path according to the utility model embodiment
It is intended to；
Fig. 8 is a kind of showing in line voltage negative half-cycle freewheeling period current path according to the utility model embodiment
It is intended to.
Embodiment
In order that those skilled in the art more fully understand the utility model scheme, it is real below in conjunction with the utility model
The accompanying drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment is only the embodiment of the utility model part, rather than whole embodiments.Based on the reality in the utility model
Example is applied, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made all should
When the scope for belonging to the utility model protection.
It should be noted that term " first " in specification and claims of the present utility model and above-mentioned accompanying drawing,
" second " etc. is for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so
The data used can be exchanged in the appropriate case, so that embodiment of the present utility model described herein can be with except at this
In diagram or description those beyond order implement.In addition, term " comprising " and " having " and their any deformation, meaning
Figure is that covering is non-exclusive and included, and is not necessarily limited to clearly for example, containing a series of process of units, system, product or equipment
Those units listed to Chu, but may include not listing clearly or intrinsic for these processes, product or equipment
Other units.
According to the one side of the utility model embodiment there is provided a kind of combining inverter, including：Auxiliary circuit, is used
In the first free wheeling path of offer and the second free wheeling path, wherein, auxiliary circuit includes：First switch pipe, source electrode and parallel network reverse
The first port connection of device, grid is control end；First diode, positive pole is connected with the drain electrode of first switch pipe；Second switch
Pipe, drain electrode is connected with the negative pole of the first diode, the second port connection of source electrode and combining inverter, and grid is control end；The
Two diodes, positive pole is connected with the drain electrode of second switch pipe, and negative pole is connected with the drain electrode of first switch pipe, wherein, first switch
Pipe, the first diode and second switch pipe constitute the first free wheeling path, first switch pipe, the second diode and second switch
Pipe the second free wheeling path of formation, wherein, first port and second port are connected with power network.
Fig. 2 is a kind of schematic diagram of the new free wheeling path of combining inverter according to the utility model embodiment, such as Fig. 2
Shown, the free wheeling path includes：Auxiliary circuit, for providing the first free wheeling path and the second free wheeling path, wherein, auxiliary circuit
Including：The first port 21 of first switch pipe S6, source electrode and combining inverter is connected, and grid is control end；First diode D7,
Positive pole is connected with the drain electrode of first switch pipe；Second switch pipe S5, drain electrode be connected with the negative pole of the first diode, source electrode with it is grid-connected
The second port 22 of inverter is connected, and grid is control end；Second diode D8, positive pole is connected with the drain electrode of second switch pipe,
Negative pole is connected with the drain electrode of first switch pipe, wherein, first switch pipe S6, the first diode D7 and second switch pipe S5 are constituted
First free wheeling path, first switch pipe S6, the second diode D8 and second switch pipe S5 the second free wheeling paths of formation, wherein,
First port 21 is connected with first inductance L2 one end, and second port 22 is connected with second inductance L1 one end, the first inductance L2 and
Second inductance L1 other end is connected with power network Grid.
By above-described embodiment, combining inverter adds auxiliary circuit, continues for providing the first free wheeling path and second
Flow path, wherein, auxiliary circuit includes：The first port connection of first switch pipe, source electrode and combining inverter, grid is control
End；First diode, positive pole is connected with the drain electrode of first switch pipe；Second switch pipe, drain electrode and the negative pole of the first diode connect
Connect, the second port connection of source electrode and combining inverter, grid is control end；Second diode, positive pole and second switch pipe
Drain electrode connection, negative pole is connected with the drain electrode of first switch pipe, wherein, first switch pipe, the first diode and second switch pipe
The first free wheeling path is constituted, first switch pipe, the second diode and second switch pipe form the second free wheeling path, wherein, the
Single port is connected with first inductance one end, and the first inductance other end is connected with power network, second port and second inductance one end phase
Even, the second inductance other end is connected with power network.In the above-described embodiments, afterflow road is provided by newly-increased auxiliary circuit
Footpath, the free wheeling path is without direct current source so that free wheeling path diminishes when inversion works, and avoids bipolar modulation
Transistor, reduces switching loss, solves the ineffective technical problem of inverter in the prior art.
Further, the new transistor and diode with body diode is increased so that free wheeling path is not when inversion works
Free wheeling path and free wheeling path during unipolarity modulation work during bipolar modulation work are same as, while afterflow when also making the inversion work
Path diminishes, so that avoiding bipolar modulation transistor switch is lost larger problem, alternatively, also inhibits common mode electric leakage
Stream, improves inverter efficiency and EMC performances, and then solve the ineffective technical problem of inverter.
As shown in Fig. 2 auxiliary circuit can also include：3rd diode, positive pole is connected with the source electrode of first switch pipe, is born
Pole is connected with the drain electrode of first switch pipe；4th diode, positive pole is connected with the source electrode of second switch pipe, negative pole and second switch
The drain electrode connection of pipe.
Specifically, the 3rd diode D6, positive pole is connected with first switch pipe S6 source electrode, and negative pole is with first switch pipe S6's
Drain electrode connection；4th diode D5, positive pole is connected with second switch pipe S5 source electrode, and the drain electrode of negative pole and second switch pipe S5 connects
Connect.
Further, first port is connected by the first inductance with power network, and second port is connected by the second inductance and power network
Connect.
Specifically, first port 21 is connected by the first inductance L2 with power network Grid, and second port 22 passes through the second inductance
L1 is connected with power network Grid.
Further, combining inverter also includes：3rd switching tube, drain electrode is connected with the input of combining inverter, source
Pole is connected with the drain electrode of second switch pipe, and grid is control end；4th switching tube, drain electrode and the input of combining inverter connect
Connect, source electrode is connected with the drain electrode of first switch pipe, grid is control end；5th switching tube, drain electrode and the source electrode of second switch pipe
The negative pole of connection, source electrode and dc source is connected, and grid is control end；6th switching tube, drain electrode and the source electrode of first switch pipe
The negative pole of connection, source electrode and dc source is connected, and grid is control end.
Fig. 3 is a kind of schematic diagram of combining inverter according to the utility model embodiment, shown in Fig. 3, the 3rd switching tube
S1 drain electrode and the input of combining inverter are connected, namely the 3rd switching tube S1 drain electrode and the input of combining inverter are rectified
Pole is connected, and source electrode is connected with second switch pipe S5 drain electrode, and grid is control end；4th switching tube S2 drain electrode and parallel network reverse
The input connection of device, namely the 4th switching tube S2 drain electrode and the input anode of combining inverter are connected, source electrode and first
Switching tube S6 drain electrode connection, grid is control end；5th switching tube S3 drain electrode is connected with second switch pipe S5 source electrode, source
The negative pole connection of pole and dc source, grid is control end；6th switching tube S4 drain electrode connects with first switch pipe S6 source electrode
Connect, the negative pole connection of source electrode and dc source, grid is control end.
Wherein, the control end in above-described embodiment is used for receiving the drive signal of controller.
Alternatively, combining inverter also includes：5th diode, negative pole is connected with the drain electrode of the 3rd switching tube, positive pole with
The source electrode connection of 3rd switching tube；6th diode, negative pole is connected with the drain electrode of the 4th switching tube, positive pole and the 4th switching tube
Source electrode is connected；7th diode, negative pole is connected with the drain electrode of the 5th switching tube, and positive pole is connected with the source electrode of the 5th switching tube；The
Eight diodes, negative pole is connected with the drain electrode of the 6th switching tube, and positive pole is connected with the source electrode of the 6th switching tube.
Specifically, as shown in figure 3, the 5th diode D1, negative pole is connected with the 3rd switching tube S1 drain electrode, positive pole and the 3rd
Switching tube S1 source electrode connection；6th diode D2, negative pole is connected with the 4th switching tube S2 drain electrode, positive pole and the 4th switching tube
S2 source electrode connection；7th diode D3, negative pole is connected with the 5th switching tube S3 drain electrode, positive pole and the 5th switching tube S3 source
Pole is connected；8th diode D4, negative pole is connected with the 6th switching tube S4 drain electrode, and positive pole and the 6th switching tube S4 source electrode connect
Connect.Wherein, diode is the device with two electrodes in electronic component, only allows an electric current to be flowed through by single direction.
With reference to Fig. 4, Fig. 5 and Fig. 6, the operation principle of combining inverter is solved when being positive half cycle to line voltage
Release.As shown in Figure 5：When the 3rd switching tube S1, the 6th switching tube S4 and second switch pipe S5 conducting, the 4th switching tube S2, the
Five switching tube S3 and first switch pipe S6 end, and current path is：Vdc+→S1→S5→L1→Grid→L2→S4→
Vdc-, is now the inversion stage, and the schematic diagram of its current path conveys electricity as shown in figure 5, so constituting inversion circuit to power network
Stream, now transistor drive signal is as shown in Figure 4 in circuit.
When the 3rd switching tube S1 and the 6th switching tube S4 disconnects, second switch pipe S5 is remained on, the 4th switching tube S2,
5th switching tube S3 and first switch pipe S6 still keep cut-off, because the second inductance L1 and the first inductance L2 electric currents can not dash forward
Become, so current path is：Grid → L2 → D6 → D7 → S5 → L1, is now inductance freewheeling period, the signal of its current path
Figure conveys electric current as shown in fig. 6, so constituting inductance continuous current circuit to power network, now transistor drive signal such as Fig. 4 in circuit
It is shown.
With reference to Fig. 4, Fig. 7 and Fig. 8, the operation principle of combining inverter is solved when being negative half period to line voltage
Release.As shown in Figure 7：4th switching tube S2, the 5th switching tube S3 and first switch pipe S6 conductings, the 3rd switching tube S1, the 6th
Switching tube S4 and second switch pipe S5 cut-offs, now current path is：Vdc+→S2→S6→L2→Grid→L1→S3→
Vdc-, is now the inversion stage, its current path schematic diagram such as Fig. 7, so constitutes inversion circuit and conveys electric current to power network, now
Transistor drive signal is as shown in Figure 4 in circuit.
When the 4th switching tube S2 and the 5th switching tube S3 disconnects, first switch pipe S6 is remained on, the 3rd switching tube S1,
6th switching tube S4 and second switch pipe S5 still keep cut-off, because the second inductance L1 and the first inductance L2 electric current can not dash forward
Become, so current path is：Grid → L1 → D5 → D8 → S6 → L2, is now inductance freewheeling period, the signal of its current path
Figure such as Fig. 8, so constitutes inductance continuous current circuit and conveys electric current to power network, now transistor drive signal is as shown in Figure 4 in circuit.
In the positive half cycle of line voltage, the 3rd switching tube S1 and the 6th switching tube S4 make positive taut pulse with same drive signal
Width modulation high frequency is opened and turned off, and second switch pipe S5 is to open and turn off with mains frequency identical low frequency.In line voltage
During negative half period, the 4th switching tube S2 and the 5th switching tube S3 make sinusoidal pulse width modulation high frequency with identical drive signal and open and close
It is disconnected.S6 is to open and turn off with mains frequency identical low frequency.
The utility model embodiment is by newly increasing transistor S5, S6 and diode D7, D8 with body diode, in power network
Diminish when the second inductance of voltage positive-negative half-cycle L1, the first inductance L2 afterflows there is provided new free wheeling path, free wheeling path, will not
Be lost as bipolar modulation transistor switch it is larger, while also inhibits common mode leakage current, so as to improve inverter effect
Rate and EMC performances.
According to the other side of the utility model embodiment, a kind of inversion system is additionally provided, the inversion system includes：
Above-mentioned combining inverter.
As shown in figure 3, the inversion system includes：Above-mentioned combining inverter.
Further, inversion system also includes：Dc source, the positive pole of dc source and the input of combining inverter
Positive pole is connected, and the negative pole of the negative pole of dc source and the input of combining inverter is connected.
Further, inversion system also includes：The positive pole connection of filter capacitor, one end and dc source, the other end with it is straight
Flow the negative pole connection of power supply.
Specifically, inversion system also includes：Filter capacitor C, one end is connected with dc source Vdc positive pole, the other end with
Dc source Vdc negative pole connection.
Further, dc source includes：Photo-voltaic power supply, wind-force power supply and power-equipment power supply.
Wherein, dc source Vdc positive pole and negative pole is all the input for belonging to combining inverter, that is, combining inverter
Input be dc source Vdc, output is parallel network reverse at the second inductance L1, the first inductance L2 and power network Grid interface point
The input (i.e. dc source Vdc) of device is exchanged when passing through the second inductance L1, the first inductance L2 with power network Grid interface point and sent
To power network Grid.
Specifically, combining inverter, can be generally divided into photovoltaic power generation grid-connected inverter, wind power-generating grid-connected inverter,
Power-equipment electricity generation grid-connecting inverter and other power generation combining inverters.Inverter major function is by direct current
It is converted into alternating current.Alternatively, dc source includes：Photo-voltaic power supply, wind-force power supply and power-equipment power supply.
Further, inversion system also includes：The first port connection of first inductance, first end and combining inverter, the
Two ends are connected with power network；The second port connection of second inductance, first end and combining inverter, the second end is connected with power network.
Specifically, inversion system also includes：First inductance L2 first ends and the first port of combining inverter are connected, and second
End is connected with power network；The second port connection of second inductance L1, first end and combining inverter, the second end is connected with power network.
Wherein, inductance (inductance coil)：It is the electromagnetic induction with insulated conductor (such as enamel-covered wire, cotton-covered wire) coiling
Element, is also one of component for commonly using in electronic circuit.Either：With enamel-covered wire, cotton-covered wire or modeling rubber-insulated wire etc. in insulation
The coaxial wire turn of the one group of series connection turned on skeleton or magnetic core, iron core, it is represented with alphabetical " L " in circuit, main function
Be AC signal is carried out Isolation or with the composition resonance circuit such as capacitor, resistor.It is also the one of closed-loop path
Attribute.After coil is by electric current, after coil, magnetic field induction is formed in coil, induced field can produce induced electricity again
Stream is resisted by the electric current in coil.It is also the physical quantity that electromagnetic induction ability is produced for coil gauge.
Above-mentioned the utility model embodiment sequence number is for illustration only, and the quality of embodiment is not represented.
In above-described embodiment of the present utility model, the description to each embodiment all emphasizes particularly on different fields, in some embodiment
The part not being described in detail, may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents, others can be passed through
Mode is realized.Wherein, device embodiment described above is only schematical, such as division of described unit, Ke Yiwei
A kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication link of unit or module by some interfaces
Connect, can be electrical or other forms.
The unit illustrated as separating component can be or may not be physically separate, be shown as unit
Part can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple units
On.Some or all of unit therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.
In addition, each functional unit in the utility model each embodiment can be integrated in a processing unit,
Can be that unit is individually physically present, can also two or more units it is integrated in a unit.It is above-mentioned integrated
Unit can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as protection domain of the present utility model.
Claims (10)
1. a kind of combining inverter, it is characterised in that including：
Auxiliary circuit, for providing the first free wheeling path and the second free wheeling path, wherein, the auxiliary circuit includes：
The first port connection of first switch pipe, source electrode and combining inverter, grid is control end；
First diode, positive pole is connected with the drain electrode of the first switch pipe；
Second switch pipe, drain electrode is connected with the negative pole of first diode, the second port of source electrode and the combining inverter
Connection, grid is control end；
Second diode, positive pole is connected with the drain electrode of the second switch pipe, and negative pole is connected with the drain electrode of the first switch pipe；
Wherein, the first switch pipe, first diode and the second switch pipe constitute the first free wheeling path, described
First switch pipe, second diode and the second switch pipe the second free wheeling path of formation；
Wherein, the first port and the second port are connected with power network.
2. combining inverter according to claim 1, it is characterised in that the auxiliary circuit also includes：
3rd diode, positive pole is connected with the source electrode of the first switch pipe, and negative pole is connected with the drain electrode of the first switch pipe；
4th diode, positive pole is connected with the source electrode of the second switch pipe, and negative pole is connected with the drain electrode of the second switch pipe.
3. combining inverter according to claim 1, it is characterised in that the first port by the first inductance with it is described
Power network is connected, and the second port is connected by the second inductance with the power network.
4. combining inverter according to claim 1, it is characterised in that the combining inverter also includes：
3rd switching tube, drain electrode is connected with the input of combining inverter, and source electrode is connected with the drain electrode of the second switch pipe, grid
Extremely control end；
4th switching tube, drain electrode is connected with the input of combining inverter, and source electrode is connected with the drain electrode of the first switch pipe, grid
Extremely control end；
5th switching tube, drain electrode is connected with the source electrode of the second switch pipe, the negative pole connection of source electrode and dc source, and grid is
Control end；
6th switching tube, drain electrode is connected with the source electrode of the first switch pipe, and source electrode is connected with the negative pole of the dc source, grid
Extremely control end.
5. combining inverter according to claim 4, it is characterised in that the combining inverter also includes：
5th diode, negative pole is connected with the drain electrode of the 3rd switching tube, and positive pole is connected with the source electrode of the 3rd switching tube；
6th diode, negative pole is connected with the drain electrode of the 4th switching tube, and positive pole is connected with the source electrode of the 4th switching tube；
7th diode, negative pole is connected with the drain electrode of the 5th switching tube, and positive pole is connected with the source electrode of the 5th switching tube；
8th diode, negative pole is connected with the drain electrode of the 6th switching tube, and positive pole is connected with the source electrode of the 6th switching tube.
6. a kind of inversion system, it is characterised in that including：Combining inverter in claim 1 to 5 described in any one.
7. inversion system according to claim 6, it is characterised in that the inversion system also includes：
Dc source, the positive pole of the dc source is connected with the positive pole of the input of the combining inverter, the direct current
The negative pole in source is connected with the negative pole of the input of the combining inverter.
8. inversion system according to claim 7, it is characterised in that the inversion system also includes：
Filter capacitor, one end is connected with the positive pole of the dc source, and the other end is connected with the negative pole of the dc source.
9. inversion system according to claim 7, it is characterised in that the dc source includes：Photo-voltaic power supply, wind electricity
Source and power-equipment power supply.
10. inversion system according to claim 6, it is characterised in that the inversion system also includes：
First inductance, first end is connected with the first port of the combining inverter, and the second end is connected with the power network；
Second inductance, first end is connected with the second port of the combining inverter, and the second end is connected with the power network.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107070280A (en) * | 2017-01-12 | 2017-08-18 | 珠海格力电器股份有限公司 | Combining inverter and inversion system |
| WO2018129975A1 (en) * | 2017-01-12 | 2018-07-19 | 珠海格力电器股份有限公司 | Grid-connection inverter and inverter system |
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