CN105305860B - A kind of inverter - Google Patents
A kind of inverter Download PDFInfo
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- CN105305860B CN105305860B CN201510693865.5A CN201510693865A CN105305860B CN 105305860 B CN105305860 B CN 105305860B CN 201510693865 A CN201510693865 A CN 201510693865A CN 105305860 B CN105305860 B CN 105305860B
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Abstract
A kind of inverter,Including,One regulating circuit,More level bridge arm circuits and output processing circuit,The regulating circuit receives DC input voitage,And the DC input voitage is transformed to DC output voltage by pressure regulation,It exports to more level bridge arms,More level bridge arm circuits are by its copped wave,And pass through output processing circuit and overlap as exchange output,The regulating circuit includes a bleeder circuit,One pressure regulation bridge arm,DC input voitage partial pressure is first voltage and second voltage by the bleeder circuit,The pressure regulation bridge arm exports first voltage to DC output end in the positive half cycle of exchange output,Second voltage is exported to DC output end in the negative half period of exchange output,The voltage of the DC output end is DC output voltage,Technical scheme of the present invention provides a kind of wrong topological structure in parallel of three-level AC being simple and efficient,And it can flexibly be extended to the staggered parallel connections of N.
Description
Technical field
The invention relates to inverters, more particularly to multi-electrical level inverter.
Background technology
The general structure of multi-electrical level inverter is to synthesize staircase waveform by several level steps to approach sine output voltage.This
Kind inverter is due to the increase of output-voltage levels number so that the harmonic content of output waveform reduces, the born voltage of switch
Stress reduces, without equalizer circuit, for example, assisting three-level inverter circuit, the diode clamp of neutral point clamp using switch
Formula inverter circuit and be mainly used in the fields such as high-voltage high-power motor speed governing, reactive-load compensation, active power filtering more level it is inverse
Become device.Patent 201310390675.7 provides a kind of topological structure of multi-electrical level inverter, as shown in Figure 1, for the patent
One specific embodiment, including the capacitor-clamped three level bridge arm of type in three tunnels, three level bridge arm A, three level bridge arm B and three level bridge arms
C.Include first switch, second switch, third switch and the 4th switch and in parallel with first switch per road three level bridge arm
First diode, second diode in parallel with second switch are opened with the third diode of third switch in parallel and with the 4th
Close the 4th diode in parallel.The winding of corresponding coupling inductance is connected respectively to per the exchange node of three level bridge arm of road.
In each three level bridge arm, first switch Q1 and second switch Q2 are connected in series in the Bus_+ and the three level bridge of dc bus
Between the exchange node of arm；Third switchs the Bus_- and the three level bridge that the switches of Q3 and the 4th Q4 is connected in series in dc bus
Between the exchange node of arm；The cathode of first diode is connected to Bus_+, and the cathode of the second diode is connected to the one or two pole
Anode, the anode of the 4th diode are connected to Bus_-, and the anode of third diode is connected to the cathode of the 4th diode；
Bridging is used for the capacitance (for example, striding capacitance) of clamp between the cathode of the anode of one diode and the 4th diode.
It can be seen that in order to realize the topological structure of multi-electrical level inverter as shown in Figure 1,12 switches are at least needed,
Circuit structure is complicated, this can not only increase the cost of circuit, more so that circuit control difficulty increases.
Invention content
The present invention provides a kind of multi-electrical level inverter, can simplify the topological structure of multi-electrical level inverter in known technology.
Technical scheme of the present invention, a kind of inverter, including a regulating circuit, more level bridge arm circuits and output processing
Circuit, the regulating circuit receives DC input voitage, and the DC input voitage is transformed to direct current output by pressure regulation
Voltage is exported to more level bridge arm circuits, its copped wave is passed through the output processing electricity by more level bridge arm circuits
Road overlap for exchange export, the regulating circuit include a bleeder circuit, a pressure regulation bridge arm and, the bleeder circuit will it is described directly
It is first voltage and second voltage to flow input voltage partial pressure, and the pressure regulation bridge arm is defeated by first voltage in the positive half cycle of exchange output
Go out to DC output end, export second voltage to DC output end in the negative half period of exchange output, the DC output end
Voltage is DC output voltage.
In the specific embodiment of the present invention, the bleeder circuit is in series by two capacitances, the first end after series connection
With direct-flow input end of the second end as the regulating circuit, midpoint end ground connection.
In the specific embodiment of the present invention, the pressure regulation bridge arm is made of four switch series aiding connections, the pressure regulation bridge
The first end of arm and the 4th end are connect with the direct-flow input end, midpoint end and the midpoint end company with the capacitor seriesing circuit
Connect, second end and third end as DC output end,
In the specific embodiment of the present invention, DC output end bridges a striding capacitance, and the both ends of the striding capacitance are made
DC output end for the regulating circuit.
In the specific embodiment of the present invention, in the inverter initial phase, the switch of the pressure regulation bridge arm
Weak opening state, the inverter be the striding capacitance charging.
In the specific embodiment of the present invention, first pulse voltage of the driving pulse of the switch of the pressure regulation bridge arm is delayed
Slow raising, makes the switch of the pressure regulation bridge arm be in weak opening state.
In the specific embodiment of the present invention, a pre-charge circuit is further included, the pre-charge circuit flies to be described across electricity
Capacity charge, the pre-charge circuit are all in when charging for the striding capacitance and work.More specifically, the pre-charge circuit is one
Flyback converter.
In the specific embodiment of the present invention, more level bridge arms are composed in series by two switches, and first after series connection
End and second end are connect with the DC output end, the output terminal of the midpoint ends of more level bridge arms as more level bridge arms.
In the specific embodiment of the present invention, crisscross parallel between multiple more level bridge arms.
In the specific embodiment of the present invention, the output processing circuit includes multiple inductance, the first end of the inductance
The output terminal with each more level bridge arms is connected respectively, and ac output end is used as after the second end parallel connection of the inductance.
In the specific embodiment of the present invention, intercouple between the inductance.
In the specific embodiment of the present invention, the output processing circuit further includes a filter circuit, the filter circuit
Including an outputting inductance and an output capacitance, the outputting inductance and output capacitance series connection, one end of the outputting inductance
It is connected with the ac output end of the coupling inductance, the second end of the outputting inductance is connected with the output capacitance, described defeated
The both ends for going out capacitance are the output terminal of inverter.
The present invention also provides a current suppressing circuit, the current suppressing circuit is connected in parallel on the both ends of the switch, is it
There is provided with the wherein opposite inhibition electric current in reverse recovery current direction during switch OFF, including, accessory power supply, auxiliary switch, auxiliary
Diode and clamp diode are helped, accessory power supply is connected with auxiliary switch, booster diode and auxiliary induction, two pole of clamper
Pipe is connected in parallel in the series arm of accessory power supply and auxiliary switch.
In a specific embodiment of the invention, before switch OFF, auxiliary switch is open-minded, and reverse recovery current in the switch
It is turned off after reaching zero.
Invention circuit using flying to overstate capacitance, constructs a small high frequency bridge arm, the staggered parallel connections of N can be extended to, with reference to coupling
Inductance is closed, output forms 2N+1 level numbers, and forms N times of yupin effect.Often increase crisscross parallel all the way, only increase by 2 switches, together
When retain the topological structures of three level.It is most simple, most economical and peak efficiency three-level topology crisscross parallel mode.
In addition, fly to overstate the circulation circuit for the three-level topology structure that capacitance is changed in known technology.Three level in known technology are opened up
Flutterring the circulation circuit of structure needs by least three switches, thus can introduce larger loop inductance, leads to higher switch
Loss and due to voltage spikes.In inverter topology provided by the invention, circulation circuit is only there are two switching, and parasitic inductance is significantly
Reduce.Due to voltage spikes can be reduced, improves reliability, reduces switching loss.
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and coordinate institute's accompanying drawings
It is described in detail below.
Description of the drawings
A multi-level converter topology structure during Fig. 1 is known technology.
Fig. 2 is block diagram of the embodiment of the present invention.
Fig. 3 is the first specific embodiment circuit diagram of inverter of the present invention.
Fig. 4 is the second specific embodiment circuit diagram of inverter of the present invention.
Fig. 5 is the third specific embodiment circuit diagram of inverter of the present invention.
Fig. 6 is the key parameter oscillogram in Fig. 3 embodiment circuits.
Fig. 7 is the circuit structure diagram of current suppressing circuit provided by the invention.
Fig. 8 is the drive waveforms switched in current suppressing circuit in Fig. 7.
Fig. 9 is the 4th specific embodiment circuit diagram of inverter of the present invention.
Figure 10 is the 5th specific embodiment circuit diagram of inverter of the present invention.
Specific embodiment
The embodiment of the present invention provides a kind of inverter, optimizes the three-level inverter in known technology, uses a kind of spy
Different regulating circuit, more level bridge arms only need two switches can be realized, and the present invention circulation circuit in only there are two
Switch, parasitic inductance are reduced, reduce due to voltage spikes, the reliability of circuit is improved with this.In order to which the content for making this exposure can be with
Easily understood, below the special example that can actually implement according to this as the present invention for embodiment.In addition, all possible parts,
Component/component/step of identical label is used in schema and embodiment, is to represent same or like component.
Fig. 2 is block diagram of the embodiment of the present invention, and the inverter includes regulating circuit 21, more level bridge arm circuits 22 and defeated
Go out processing circuit 23, the regulating circuit further includes a DC voltage input end 211 and a DC voltage output end 212, described
DC voltage input end 211 receives a DC input voitage, and the output of DC voltage output end 212 is converted by regulating circuit
DC output voltage, the DC voltage output end 212 is in parallel with more level bridge arm circuits 22, more level bridge arms
The DC output voltage is carried out copped wave by circuit 22, and is exported to output processing circuit 23, and output processing circuit 23 will be mostly electric
The output of more level bridge arm 221-22n in flat bridge arm circuit 22 carries out overlapping exported with filtering process from output terminal 231 and exchanges
Electricity.When the number of more level bridge arms is n, the output of more level bridge arm circuits then shows as 1+2n level.
Fig. 3 is a specific embodiment of the invention, and regulating circuit 31 described in the present embodiment includes bleeder circuit 313, pressure regulation
DC input voitage Vin is decomposed into first voltage and second voltage by bridge arm 314, the bleeder circuit 313, in particular institute
It states bleeder circuit 313 and includes capacitance C1 and capacitance C2, the capacitance C1 and capacitance C2 are connected in series with, first end a and the after series connection
Two end c are in parallel with direct-flow input end 311, intermediate ends b ground connection.Voltage VC1 of the first voltage for capacitance C1 both ends, described the
Two voltages are the voltage VC2 at capacitance C2 both ends, and for ground terminal, the VC1 is a positive voltage, for just the half of alternating current
Week input, the VC2 are a negative voltage, are inputted for the negative half period of alternating current.The pressure regulation bridge arm 314 is by switching Qt1/
Qt2Qt3/Qt4 is composed in series, and forms terminal d/e/f/g/h, pressure regulation bridge arm first end d and the 4th end h and direct-flow input end 311
Parallel connection, the intermediate ends f of pressure regulation bridge arm are connected with the intermediate ends b of bleeder circuit, the second end e of pressure regulation bridge arm and the g conducts of third end
DC output end 312.DC output end 312 is in parallel with more level bridge arm circuits 32.More level bridge arm circuits in the present embodiment
32 include level bridge arm more than two：More level bridge arms 321 and more level bridge arms 322, more level bridge arms 321 and more level bridges
Arm 322, which is connected in parallel, forms bridge arm circuit 32, and more level bridge arms 321 and more level bridge arms 322 are composed in series by two switches,
Output terminal of the midpoint as more level bridge arms after described two switch series connection, each output terminal connect with the output processing circuit 33
It connects.The output processing circuit 33 includes inductance L and an output filter circuit 331, and the inductance L includes inductance L1 and L2, institute
The first end for stating inductance L1 is connected with the output terminal of more level bridge arms 321, the first end of the inductance L2 and the mostly electricity
The output terminal connection of level bridge arm 322, connect, the output after the second end parallel connection of the inductance L1 and L2 with output filter circuit
Filter circuit includes an output inductor Lo, and an output filter capacitor Co, the voltage at the output filter capacitor both ends is institute
The ac output end of inverter, output AC voltage are stated, the ground terminal of the output AC voltage is connect with aforementioned ground terminal.It is described defeated
Go out filter inductance Lo to may alternatively be integrated in inductance L.
The waveform of the driving voltage of each switch and the waveform of the output voltage of inverter and electric current such as Fig. 6 institutes in Fig. 3
Showing, wherein Vdr_Qt1/Vdr_Qt2/Vdr_Qt3/Vdr_Qt4 is the driving voltage that Qt1-Qt4 is switched in the pressure regulation bridge arm,
Driving voltages of the Vdr_Qu1/Vdr_Qu2/Vdr_Qd1/Vdr_Qd2 to switch Qu1/Qu2/Qd1/Qd2 in multi-level circuit, Vo
It is respectively voltage signal and current signal in output filter capacitor with Io.As shown in fig. 6, the switch power frequency of pressure regulation bridge arm is open-minded
Or shutdown, in output AC voltage positive half cycle, the switch Qt1 and Qt3 is open-minded, by the positive voltage at capacitance C1 both ends export to
DC voltage output end 322, in output AC voltage negative half period, the switch Qt2 and Qt4 is open-minded, by the negative of capacitance C2 both ends
Voltage output is to DC voltage output end 322.In addition the switch high-frequency in more level bridge arm circuits 33 is opened or is turned off, described
More level bridge arms 331 and more 332 crisscross parallels of level bridge arm, the crisscross parallel refer to wherein more level bridge arm phase shifting works
Make, the phase being staggered can be it is impartial can also be unequal.More level bridge arms 331 and more level in the present embodiment
180 ° of the phase shifting of bridge arm 332, such as 180 ° of switch Qu1 and switch Qu2 phase shiftings, switch Qd1 and switch Qu1 complementations are led
It is logical, switch Qd2 and switch Qu2 complementation conductings.Circulation circuit in each on off state is only there are two switch composition, such as switch
Qu1 and Qu2.
Fig. 9 is the another specific embodiment of the present invention, and unlike embodiment illustrated in fig. 3, in the present embodiment, direct current is defeated
In parallel one flies to overstate that capacitance Cr, Qt1 and Qt3 are opened or Qt2, Qt4 are open-minded in outlet 312, flies to overstate capacitance Cr voltages all clampers
In 0.5Vin, stable state, fly to overstate that capacitance Cr by natural clamper, flies to overstate that capacitance Cr only provides radio circuit, flies to overstate base in capacitance Cr
This no current.In addition HF switch circuit is flown to overstate that capacitance Cr is decoupled, thus the high frequency of the switch in more level bridge arm circuits is opened
It is small to close loss.
In addition in the stage of inverter startup, striding capacitance is precharged, and the present invention provides two kinds of implementations
Example, first the first, the voltage of first driving pulse that Qt1 or Qt4 is switched by control slowly increases, using weak open-minded
State, to flying to overstate capacitor charging.In addition another kind sets a pre-charge circuit, as flyback converter flyback multi output around
Group isolation charging circuit.Flyback converter flyback only works when being pre-charged for striding capacitance.
Figure 10 is the another specific embodiment of the present invention, defeated described in the present embodiment unlike embodiment illustrated in fig. 3
The inductance L gone out in processing circuit 103 includes a coupling inductance for one, and the coupling inductance L includes multiple windings：L1 and L2, institute
The first end for stating winding L1 is connected with the output terminal of more level bridge arms 1021, the first end of the winding L2 and the mostly electricity
The output terminal connection of level bridge arm 1022, connect after the second end parallel connection of winding L1 and L2 with output filter circuit, the output filter
Wave circuit includes an output inductor Lo, and an output filter capacitor Co, the voltage at the output filter capacitor both ends is described
The ac output end of inverter, output AC voltage, the ground terminal of the output AC voltage are connect with aforementioned ground terminal.The output
Filter inductance Lo may alternatively be integrated in inductance L.
Fig. 4 show another specific embodiment of the present invention, and DC input voitage is exported for a photovoltaic cell in the embodiment
PV, the regulating circuit 31 in regulating circuit 41 and Fig. 3 is similar, but more level bridge arm circuits 42 in the embodiment include three
A more level bridge arms 421/422/423, the level bridge arm crisscross parallel more than three, can mutually be spaced 120 ° or
Other are uneven angularly.The output terminal of level bridge arm more than three respectively with three winding L1/L2/L3 in coupling inductance L
One end is connected, and is connect after the second end parallel connection of these three windings as output terminal with output filter circuit.It is defeated in the present embodiment
Go out filter circuit and only include an output filter capacitor Co, the first end of output filter capacitor Co and the output of the coupling inductance L
End connection, second end ground connection.Output inductor Lo is integrated in the coupling inductance L.So as to reduce design output filter
Wave inductance Lo.
Fig. 5 show the another specific embodiment of the present invention, and more level bridge arm circuits 52 described in the embodiment have n
More level bridge arms, more level bridge arm crisscross parallels, the angle of crisscross parallel can be 360 ° impartial/n or its
His unequal angle, multiple more level bridge arms respectively at coupling inductance multiple windings in series, by the overlapping of coupling inductance
Ac output voltage is exported after effect, which has 2n+1 level numbers, and forms n times of yupin effect.The present invention carries
Often increase crisscross parallel all the way in the technical solution of confession, only increase by 2 switches, while retain the topological structure of three level.It is most
Simply, most economical and peak efficiency three-level topology crisscross parallel mode.
Switch described in technical solution can use MOSFET or other GaN in the present invention, and SiC device substitutes.It can also
It is used in mixed way IGBT, MOSFET element.
Switch Qun or Qdn in above-mentioned more level bridge arms, after replacing with MOSFET, circulation circuit is in dead time
The body diode of MOSFET can be passed through.If the body diode reverse recovery characteristics of MOSFET are bad, Reverse recovery will be caused
Loss.
The present invention also provides a current suppressing circuits, can solve the problems, such as MOSFET Reverse recoveries so that present invention electricity
Road characteristic is further promoted.
Current suppressing circuit 7 provided by the invention, as shown in fig. 7, the current suppressing circuit 7 is connected in parallel on the two of switch Q
End can provide an electric current opposite with the current direction of its reverse recovery current, to inhibit to switch the reversed extensive of Q for switch Q
Multiple loss.
Current suppressing circuit 7 has accessory power supply Vf, auxiliary switch Qf, booster diode Df and clamp diode Dq,
Accessory power supply Vf connects with auxiliary switch Qf, booster diode Df and auxiliary induction Lf, and clamp diode Dq is connected in parallel on auxiliary
In the series arm of power supply Vf and auxiliary switch Qf, the voltage value of accessory power supply Vf is less than the pressure voltage of switching tube Q, presses down for electric current
Circuit 7 processed provides electric energy.Such as when switching tube Q is 600V 650V injectrons, accessory power supply Vf can be selected
15V.When auxiliary switch Qf is connected, current suppressing circuit 7 can provide the electric current side with wherein reverse recovery current for switching tube Q
Can be low tension switch pipe to opposite inhibition electric current If, auxiliary switch Qf.Booster diode Df is to ensure a suppression of electric current
If can only flow out to switching tube Q from accessory power supply Vf, and not have current direction accessory power supply Vf damage accessory power supplys Vf.It is auxiliary
It is lead-in inductance or outer coilloading to help inductance Lf, for adjusting the rate for inhibiting electric current If raising and lowerings.Clamp diode
Dq has the function of clamp voltage, and low pressure can be selected to assist Schottky diode.The following institute of switching sequence of auxiliary switch Qf
State, and with reference to the switching tube Q in Fig. 8 driving voltage Vdr_Q and auxiliary switch Qf driving voltage Vdr_Qf oscillogram.
【T0] moment, switching tube Q is in opening state, and electric current flows into D poles from the S poles of switching tube Q at this time.
【t1】Moment, auxiliary switch Qf are open-minded so that accessory power supply Vf, which is generated, inhibits electric current If, flows through booster diode
Df and switching tube Q, at this moment, the absolute value of the electric current in switching tube Q is begun to decline.
【t2】Moment, switching tube Q are closed, and at this moment have the body diode that portion of electrical current flows through switching tube Q, due to inhibiting
The effect of electric current If, this portion of electrical current can quickly reach 0.Therefore, the reverse recovery characteristic of switching tube Q can substantially improve.
【t3】Moment, auxiliary switch Qf are closed.
When the current suppressing circuit of the present invention is applied in the switch of more level bridge arms as described in Fig. 2-5, auxiliary is opened
Closing Qf should turn off after the switch of another in bridge arm is opened, in this way, auxiliary switch Qf can realize Zero Current Switch.Therefore,
Switching loss very little.
In order to which electric current is avoided to flow through the body diode of switching tube Q completely, such optimization processing is done：(1) it opens ahead of time auxiliary
Switch Qf is helped, is extended【t1-t2】Time so that before the t2 moment, the electric current of switching tube Q flows to D poles from S poles and becomes from D poles
Flow to S poles.(2) size of adjustment auxiliary induction Lf, realizes and inhibits electric current If rapid increases, quickly make the electric current in switching tube Q
Conversion is reversed.
This circuit can expand to the topologys such as the DC-DC converter of other synchronous rectifications, PFC.Eliminating because
Reverse-recovery problems caused by the body diode of MOSFET
In conclusion the embodiment of the present invention proposes a kind of inverter, using being formed pressure regulation bridge arm by four switches and combined
Bleeder circuit and striding capacitance, more level bridge arms only need two switches can be realized, and three level optimized in known technology are inverse
Become device, the efficiency of circuit can be improved.Uninterruptible power system (UPS) is can be applied to, DC input voitage is defeated for a direct current at this time
Enter electricity, exchange output electricity is supplied to a load；Photovoltaic generating system is can also be applied to, DC input voitage can be photovoltaic at this time
The DC output voltage of battery, exchange output electricity can be supplied to load that can also be connected to the grid.
Although the present invention has been disclosed by way of example above, it is not intended to limit the present invention., any technical field
Middle tool usually intellectual, without departing from the spirit and scope of the present invention, when can make some changes and embellishment, thus it is of the invention
Protection domain should be defined by the scope of the appended claims.
Claims (12)
1. a kind of inverter, including a regulating circuit, more level bridge arm circuits and output processing circuit, the regulating circuit connect
DC input voitage is received, and the DC input voitage is transformed to DC output voltage by pressure regulation, is exported to described mostly electric
Its copped wave is passed through the output processing circuit and overlapped to exchange output by flat bridge arm circuit, more level bridge arm circuits,
It is characterized in that, the regulating circuit includes a bleeder circuit, a pressure regulation bridge arm and a DC output end, and the bleeder circuit is by institute
It is first voltage and second voltage to state DC input voitage partial pressure, and the pressure regulation bridge arm is electric by first in the positive half cycle of exchange output
Pressure is exported to the DC output end, is exported second voltage to the DC output end in the negative half period of exchange output, described
The voltage of DC output end is DC output voltage.
2. a kind of inverter as described in claim 1, which is characterized in that the bleeder circuit is in series by two capacitances, string
Direct-flow input end of the first end and second end as the regulating circuit after connection, midpoint end ground connection.
3. a kind of inverter as claimed in claim 2, which is characterized in that the pressure regulation bridge arm is by four switch series aiding connection structures
Into respectively first switch, second switch, third switch and the 4th switch, and one end of the first switch is the pressure regulation bridge
Second end of the series connection point of the first end of arm, the first switch and second switch for the pressure regulation bridge arm, the second switch
Series connection point with third switch is the intermediate ends of the pressure regulation bridge arm, and the series connection point of the third switch and the described 4th switch is
The third end of the pressure regulation bridge arm, fourth end of the described 4th other end switched for the pressure regulation bridge arm, the pressure regulation bridge arm
First end and the 4th end connect with the direct-flow input end, midpoint end and connect with the midpoint end of the capacitor seriesing circuit,
Second end and third end are DC output ends, and a striding capacitance, the both ends of the striding capacitance are bridged on the DC output end
DC output end as the regulating circuit.
4. a kind of inverter as claimed in claim 3, which is characterized in that in the inverter initial phase, the pressure regulation bridge
The switch of arm is weak opening state, and the inverter charges for the striding capacitance.
A kind of 5. inverter as claimed in claim 4, which is characterized in that the first of the driving pulse of the switch of the pressure regulation bridge arm
A pulse voltage slowly increases, and the switch for making the pressure regulation bridge arm is weak opening state.
6. a kind of inverter as claimed in claim 3, which is characterized in that further include a pre-charge circuit, the pre-charge circuit
It charges for the striding capacitance, the pre-charge circuit only works when charging for the striding capacitance, more specifically, described pre-
Charging circuit is a flyback converter.
7. a kind of inverter as described in claim 1, which is characterized in that more level bridge arms are composed in series by two switches,
First end and second end after series connection is connect with the DC output end, and the midpoint end of more level bridge arms is as more level bridge arms
Output terminal.
A kind of 8. inverter as claimed in claim 7, which is characterized in that crisscross parallel between multiple more level bridge arms.
9. a kind of inverter as described in claim 1, which is characterized in that the output processing circuit includes a coupling inductance, institute
State coupling inductance and include multiple windings, the output terminal of the first end of the winding respectively with the level bridge arm is connect, it is described around
As ac output end after the second end of group is in parallel with the second end of winding other described.
10. a kind of inverter as claimed in claim 9, which is characterized in that the output processing circuit further includes a filter circuit,
The filter circuit includes an outputting inductance and an output capacitance, the outputting inductance and output capacitance series connection, described defeated
The one end for going out inductance is connected with the ac output end of the coupling inductance, the second end of the outputting inductance and the output capacitance
Connection, the both ends of the output capacitance are the output terminal of inverter, and the outputting inductance is integrated in the coupling inductance.
11. a kind of inverter as claimed in claim 7, which is characterized in that further include current suppressing circuit, be connected in parallel on described mostly electric
The both ends switched in level bridge arm, for it is described switch provide with during switch OFF wherein reverse recovery current direction it is opposite inhibition electricity
Stream, including accessory power supply, auxiliary switch, booster diode and clamp diode are the accessory power supply and auxiliary switch, auxiliary
Diode and auxiliary induction is helped to connect, the clamp diode is connected in parallel in the series arm of accessory power supply and auxiliary switch.
12. a kind of inverter as claimed in claim 11, which is characterized in that before the switch OFF, the auxiliary switch is opened
It is logical, and reverse recovery current turns off after reaching zero in the switch.
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| EP3726722A1 (en) * | 2019-04-18 | 2020-10-21 | Siemens Aktiengesellschaft | Interleaved power converter |
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| US11557983B2 (en) * | 2020-01-15 | 2023-01-17 | Solaredge Technologies Ltd. | Coupled inductors inverter topology |
| CN112910297B (en) * | 2021-01-21 | 2022-02-15 | 山东大学 | Three-level SNPC converter system and two-stage model prediction control method |
| CN113078837B (en) * | 2021-03-23 | 2022-08-16 | 华中科技大学 | Clamping type three-level converter based on auxiliary bridge arm structure and control method |
| CN115411928A (en) * | 2022-08-18 | 2022-11-29 | 华为数字能源技术有限公司 | PFC (power factor correction) circuit, control method, electric vehicle and charging pile |
| CN115425847B (en) * | 2022-11-07 | 2023-02-28 | 广东希荻微电子股份有限公司 | Power conversion circuit and electronic device |
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| CN103475248A (en) * | 2013-08-30 | 2013-12-25 | 华为技术有限公司 | Power conversion circuit and power conversion system |
| JP2014239615A (en) * | 2013-06-07 | 2014-12-18 | 株式会社滋賀設計 | Three-level inverter |
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| CN103001526A (en) * | 2011-09-15 | 2013-03-27 | 南京博兰得电子科技有限公司 | Non-isolated inverter and control method thereof |
| CN102891602A (en) * | 2012-09-28 | 2013-01-23 | 江苏银佳企业集团有限公司 | Three-level DC converter |
| JP2014239615A (en) * | 2013-06-07 | 2014-12-18 | 株式会社滋賀設計 | Three-level inverter |
| CN103475248A (en) * | 2013-08-30 | 2013-12-25 | 华为技术有限公司 | Power conversion circuit and power conversion system |
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| EP3726722A1 (en) * | 2019-04-18 | 2020-10-21 | Siemens Aktiengesellschaft | Interleaved power converter |
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| CN105305860A (en) | 2016-02-03 |
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