CN105356776B - Nine level high-frequency inverter of single supply - Google Patents

Nine level high-frequency inverter of single supply Download PDF

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Publication number
CN105356776B
CN105356776B CN201510862889.9A CN201510862889A CN105356776B CN 105356776 B CN105356776 B CN 105356776B CN 201510862889 A CN201510862889 A CN 201510862889A CN 105356776 B CN105356776 B CN 105356776B
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diode
switching tube
electrolytic capacitor
cathode
anode
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CN105356776A (en
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曾君
吴佳磊
刘俊峰
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South China University of Technology SCUT
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South China University of Technology SCUT
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters

Abstract

The invention discloses a kind of nine level high-frequency inverter of single supply, including switching capacity unit X, differential concatenation switch pipe unit Y and full bridge unit Z；Switching capacity unit X includes the first electrolytic capacitor C1, the second electrolytic capacitor C2, the first diode VD1, the second diode VD2, the 3rd diode VD3, the tenth diode VD10, the 11st diode VD11, first switch pipe S1, second switch pipe S2With the 3rd switching tube S3；Differential concatenation switch pipe unit Y includes the 4th diode VD4, the 5th diode VD5, the 4th switching tube S4With the 5th switching tube S5；Full bridge unit Z includes the 6th diode VD6, the 7th diode VD7, the 8th diode VD8, the 9th diode VD9, the 6th switching tube S6, the 7th switching tube S7, the 8th switching tube S8With the 9th switching tube S9.The present invention has the advantages that to realize that nine level export by single power supply and a small amount of device.

Description

Nine level high-frequency inverter of single supply
Technical field
The present invention relates to high-frequency ac distribution system (High Frequency AC Power Distribution System, HFAC PDS) field, more particularly to a kind of nine level high-frequency inverter of single supply.
Background technology
High-frequency ac distribution system (HFAC PDS) is compared with traditional direct-flow distribution system (DC PDS), because having height can By property, high efficiency, high power density, can be achieved to be wirelessly transferred the advantages that and in computer, communication, electric automobile, renewable energy The fields such as source microgrid are widely applied.High-frequency inverter complete will by storage battery, fuel cell, photovoltaic solar cell or The direct current that other power generations or electric storage device provide is converted into high-frequency alternating current, and is fed to high frequency AC-bus, and then realizes The reallocation of the energy.It is defeated to multi-electrical level inverter with the continuous improvement required power supply capacity, power supply quality and power supplying efficiency The requirement for going out waveform is also higher and higher.Current multi-electrical level inverter is frequently with increase input direct-current source and the quantity of switching device More level outputs are realized to improve output performance so that the structure of inverter becomes complex, while reduces inversion The efficiency of device.
The content of the invention
It is an object of the invention to realize that more level export with single power supply and less metering device, a kind of single electricity is proposed Nine level high-frequency inverter of source, the nine level high-frequency inverter of single supply are suitable for high-frequency ac field of power distribution, can specifically answer Direct current is converted into high-frequency alternating current for fields such as computer, communication, electric automobile, regenerative resource microgrids, the inversion Device only needs single input direct-current source, and realizes that nine level export with lesser amount of device, significantly reduces output alternating current Harmonic distortion, improve the efficiency of inverter, while also effectively reduce the drive circuit needed for inverter and installation is empty Between.
The purpose of the present invention is achieved through the following technical solutions：Nine level high-frequency inverter of single supply, including：Switching capacity Unit X, differential concatenation switch pipe unit Y and full bridge unit Z；The switching capacity unit (X), differential concatenation switch pipe unit (Y) and full bridge unit (Z) two is two interconnected；The switching capacity unit X includes the first electrolytic capacitor C1, the second electrolytic capacitor C2, the first diode VD1, the second diode VD2, the 3rd diode VD3, the tenth diode VD10, the 11st diode VD11, One switching tube S1, second switch pipe S2With the 3rd switching tube S3；The first electrolytic capacitor C1With the second electrolytic capacitor C2Capacitance It is worth equal；The tenth diode VD10Anode, the first diode VD1Cathode, the second diode VD2Cathode, first open Close pipe S1Drain and second switch pipe S2Drain be connected；The first diode VD1Anode, the 11st diode VD11Anode and first switch pipe S1Source class be connected；The tenth diode VD10Cathode and the first electrolytic capacitor C1 Cathode be connected；The 11st diode VD11Cathode, the first electrolytic capacitor C1Anode and the second electrolytic capacitor C2 Cathode be connected；The second diode VD2Anode, the 3rd diode VD3Cathode, the second electrolytic capacitor C2Anode, Two switching tube S2Source class and the 3rd switching tube S3Drain be connected；The 3rd diode VD3Anode and the 3rd switch Pipe S3Source class be connected；The differential concatenation switch pipe unit Y includes the 4th diode VD4, the 5th diode VD5, the 4th open Close pipe S4With the 5th switching tube S5；The 4th diode VD4Cathode and the 4th switching tube S4Drain be connected；Described Four diode VD4Anode, the 5th diode VD5Anode, the 4th switching tube S4Source class and the 5th switching tube S5Source class It is connected；The 5th diode VD5Cathode and the 5th switching tube S5Drain be connected；The full bridge unit Z includes the 6th Diode VD6, the 7th diode VD7, the 8th diode VD8, the 9th diode VD9, the 6th switching tube S6, the 7th switching tube S7、 8th switching tube S8With the 9th switching tube S9；The 6th diode VD6Cathode, the 8th diode VD8Cathode, the 6th open Close pipe S6Drain and the 8th switching tube S8Drain be connected；The 6th diode VD6Anode, the 7th diode VD7 Cathode, the 6th switching tube S6Source class and the 7th switching tube S7Drain be connected；The 8th diode VD8Anode, 9th diode VD9Cathode, the 8th switching tube S8Source class and the 9th switching tube S9Drain be connected；The switch electricity Hold the first electrolytic capacitor C in unit X1Cathode and full bridge unit Z in the 6th switching tube S6Drain be connected；The switch electricity Hold the first electrolytic capacitor C in unit X1Anode and differential concatenation switch pipe unit Y in the 4th switching tube S4Drain electrode be connected； 5th switching tube S in the differential concatenation switch pipe unit Y5Drain and full bridge unit Z in the 6th switching tube S6Source class be connected Connect；3rd switching tube S in the switching capacity unit X3Source class and full bridge unit Z in the 7th switching tube S7Source class be connected. The first switch pipe S1, second switch pipe S2, the 3rd switching tube S3, the 4th switching tube S4, the 5th switching tube S5, the 6th switching tube S6, the 7th switching tube S7, the 8th switching tube S8With the 9th switching tube S9The first drive signal G1, the second drive signal G2, the 3rd Drive signal G3, fourth drive signal G4, the 5th drive signal G5, the 6th drive signal G6, the 7th drive signal G7, the 8th driving Signal G8With the 9th drive signal G9Obtained by basic PWM ripples by basic logic operations, basic PWM ripples are by triangular carrier Vc With DC voltage Vm1、Vm2、Vm3、Vm4Compare to obtain；The single supply high-frequency inverter presses output level grade analysis, a work Nine kinds of working statuses are shared as the cycle：
State I：Second switch pipe S2Conducting, the first electrolytic capacitor C1, the second electrolytic capacitor C2Connect with power supply, the 6th opens Close pipe S6With the 9th switching tube S9Conducting, inverter output VoutFor 2VdcLevel.
State I I：Second switch pipe S2Conducting, the first electrolytic capacitor C1, the second electrolytic capacitor C2Connect with power supply, the 4th opens Close pipe S4With the 9th switching tube S9Conducting, inverter output VoutFor 3/2VdcLevel.
State I II：3rd switching tube S3, the 6th switching tube S6With the 9th switching tube S9Conducting, the first electrolytic capacitor C1With Two electrolytic capacitor C2Serial connection charge, inverter output VoutFor VdcLevel.
State I V：3rd switching tube S3, the 4th switching tube S4, the 9th switching tube S9Conducting, the second electrolytic capacitor C2Electric discharge, Inverter exports VoutFor 1/2VdcLevel.
State V：3rd switching tube S3Conducting, the first electrolytic capacitor C1With the second electrolytic capacitor C2Serial connection charge, the 6th switch Pipe S6With the 8th switching tube S8Conducting, inverter output VoutFor 0 level.
State VI：3rd switching tube S3, the 5th switching tube S5With the 8th switching tube S8Conducting, the first electrolytic capacitor C1Electric discharge, Inverter exports VoutFor -1/2VdcLevel.
State VII：3rd switching tube S3, the 7th switching tube S7With the 8th switching tube S8Conducting, the first electrolytic capacitor C1With Two electrolytic capacitor C2Serial connection charge, inverter output VoutFor-VdcLevel.
State VIII：First switch pipe S1, the 7th switching tube S7With the 8th switching tube S8Conducting, the first electrolytic capacitor C1With Power supply is connected, inverter output VoutFor -3/2VdcLevel.
State I X：Second switch pipe S2, the 7th switching tube S7With the 8th switching tube S8Conducting, the first electrolytic capacitor C1, second Electrolytic capacitor C2Connect with power supply, inverter output VoutFor -2VdcLevel.
The single supply high-frequency inverter exports nine level staircase waveforms and is made of above-mentioned nine kinds of states, the angular frequency of staircase waveform For ω, the nine level staircase waveforms progress Fourier decomposition of single supply high-frequency inverter output can be obtained：
In formula：K and n is summation variable, and k=1,2,3,4, n=1,3,5 ...；VcCarried for triangle Ripple kurtosis, VmkFor HVDC Modulation wave voltage value, and 0<Vm1<Vm2<Vm3<Vm4<Vc。
The total harmonic distortion of output voltage (the total harmonic of the nine level high-frequency inverter of single supply Distortion, THD) expression formula be：
In formula, k and n are summation variable, and k=1,2,3,4, n=3,5,7 ....
The nine level high-frequency inverter of single supply, selects according to the expression formula of total harmonic distortion THD values of output voltage Parameter Vm1, parameter Vm2, parameter Vm3, parameter Vm4, parameter VcTo ensure that total harmonic distortion THD values of the voltage of output are met the requirements.
Compared with existing multi-electrical level inverter, the invention has the advantages that and beneficial to benefit：
(1) compared with existing three level, five level or seven electrical level inverters, the present invention possesses nine level output ladder, The harmonic content of output voltage can be efficiently reduced, and then improves the efficiency of inverter.
(2) compared with existing nine electrical level inverter, the present invention realizes that nine level export using lesser amount of device, can have Effect reduces the required drive circuit of inverter, reduces the transmission loss of energy, meanwhile, the installation space of inverter also can be effective Reduce on ground.
(3) existing multi-electrical level inverter usually requires two or more power supplys to realize that more level are defeated Go out, the present invention only needs single power supply to realize that nine level export, suitable for only having the occasion of single power supply power supply.
(4) nine level high-frequency inverter of single supply of the present invention, makes the first electrolysis C by modulation system1With second Electrolytic capacitor C2It is identical with negative half period discharge time in the positive half cycle of output waveform, so as to efficiently solve two capacitance series connection During use the problem of existing capacitor voltage equalizing.
Brief description of the drawings
Fig. 1 is the structure chart of nine level high-frequency inverter of single supply of the present invention.
Fig. 2 is nine level of the drive signal of switching tube and output in nine level high-frequency inverter of single supply of the present invention Voltage waveform view.
Embodiment
For the content and feature that the present invention is further explained, specific embodiments of the present invention are carried out below in conjunction with attached drawing Illustrate.
Embodiment
As shown in Figure 1, the structure chart for nine level high-frequency inverter of single supply.The nine level high-frequency inverter of single supply Including：Switching capacity unit X, differential concatenation switch pipe unit Y and full bridge unit Z；The switching capacity unit X includes the first electricity Solve capacitance C1, the second electrolytic capacitor C2, the first diode VD1, the second diode VD2, the 3rd diode VD3, the tenth diode VD10, the 11st diode VD11, first switch pipe S1, second switch pipe S2With the 3rd switching tube S3；The first electrolytic capacitor C1 With the second electrolytic capacitor C2Capacitance it is equal；The tenth diode VD10Anode, the first diode VD1Cathode, second Diode VD2Cathode, first switch pipe S1Drain and second switch pipe S2Drain be connected；First diode VD1Anode, the 11st diode VD11Anode and first switch pipe S1Source class be connected；The tenth diode VD10 Cathode and the first electrolytic capacitor C1Cathode be connected；The 11st diode VD11Cathode, the first electrolytic capacitor C1's Anode and the second electrolytic capacitor C2Cathode be connected；The second diode VD2Anode, the 3rd diode VD3The moon Pole, the second electrolytic capacitor C2Anode, second switch pipe S2Source class and the 3rd switching tube S3Drain be connected；Described 3rd Diode VD3Anode and the 3rd switching tube S3Source class be connected；The differential concatenation switch pipe unit Y includes the four or two pole Pipe VD4, the 5th diode VD5, the 4th switching tube S4With the 5th switching tube S5；The 4th diode VD4Cathode and the 4th open Close pipe S4Drain be connected；The 4th diode VD4Anode, the 5th diode VD5Anode, the 4th switching tube S4's Source class and the 5th switching tube S5Source class be connected；The 5th diode VD5Cathode and the 5th switching tube S5Drain phase Connection；The full bridge unit Z includes the 6th diode VD6, the 7th diode VD7, the 8th diode VD8, the 9th diode VD9、 6th switching tube S6, the 7th switching tube S7, the 8th switching tube S8With the 9th switching tube S9；The 6th diode VD6Cathode, Eight diode VD8Cathode, the 6th switching tube S6Drain and the 8th switching tube S8Drain be connected；Six or two pole Pipe VD6Anode, the 7th diode VD7Cathode, the 6th switching tube S6Source class and the 7th switching tube S7Drain be connected Connect；The 8th diode VD8Anode, the 9th diode VD9Cathode, the 8th switching tube S8Source class and the 9th switch Pipe S9Drain be connected；First electrolytic capacitor C in the switching capacity unit X1Cathode and full bridge unit Z in the 6th switch Pipe S6Drain be connected；First electrolytic capacitor C in the switching capacity unit X1Anode and differential concatenation switch pipe unit Y In the 4th switching tube S4Drain electrode be connected；5th switching tube S in the differential concatenation switch pipe unit Y5Drain and full-bridge list 6th switching tube S in first Z6Source class be connected；3rd switching tube S in the switching capacity unit X3Source class and full bridge unit Z In the 7th switching tube S7Source class be connected.
As shown in Fig. 2, the first switch pipe S1, second switch pipe S2, the 3rd switching tube S3, the 4th switching tube S4, the 5th Switching tube S5, the 6th switching tube S6, the 7th switching tube S7, the 8th switching tube S8With the 9th switching tube S9The first drive signal G1、 Second drive signal G2, the 3rd drive signal G3, fourth drive signal G4, the 5th drive signal G5, the 6th drive signal G6, the 7th Drive signal G7, the 8th drive signal G8With the 9th drive signal G9Obtained by basic PWM ripples by basic logic operations, substantially PWM ripples by triangular carrier VcWith DC voltage Vm1、Vm2、Vm3、Vm4Compare to obtain；The single supply high-frequency inverter is by output Level grade analysis, a work period share nine kinds of working statuses：
State I：Second switch pipe S2Conducting, the first electrolytic capacitor C1, the second electrolytic capacitor C2Connect with power supply, the 6th opens Close pipe S6With the 9th switching tube S9Conducting, inverter output VoutFor 2VdcLevel.
State I I：Second switch pipe S2Conducting, the first electrolytic capacitor C1, the second electrolytic capacitor C2Connect with power supply, the 4th opens Close pipe S4With the 9th switching tube S9Conducting, inverter output VoutFor 3/2VdcLevel.
State I II：3rd switching tube S3, the 6th switching tube S6With the 9th switching tube S9Conducting, the first electrolytic capacitor C1With Two electrolytic capacitor C2Serial connection charge, inverter output VoutFor VdcLevel.
State I V：3rd switching tube S3, the 4th switching tube S4, the 9th switching tube S9Conducting, the second electrolytic capacitor C2Electric discharge, Inverter exports VoutFor 1/2VdcLevel.
State V：3rd switching tube S3Conducting, the first electrolytic capacitor C1With the second electrolytic capacitor C2Serial connection charge, the 6th switch Pipe S6With the 8th switching tube S8Conducting, inverter output VoutFor 0 level.
State VI：3rd switching tube S3, the 5th switching tube S5With the 8th switching tube S8Conducting, the first electrolytic capacitor C1Electric discharge, Inverter exports VoutFor -1/2VdcLevel.
State VII：3rd switching tube S3, the 7th switching tube S7With the 8th switching tube S8Conducting, the first electrolytic capacitor C1With Two electrolytic capacitor C2Serial connection charge, inverter output VoutFor-VdcLevel.
State VIII：First switch pipe S1, the 7th switching tube S7With the 8th switching tube S8Conducting, the first electrolytic capacitor C1With Power supply is connected, inverter output VoutFor -3/2VdcLevel.
State I X：Second switch pipe S2, the 7th switching tube S7With the 8th switching tube S8Conducting, the first electrolytic capacitor C1, second Electrolytic capacitor C2Connect with power supply, inverter output VoutFor -2VdcLevel.
The single supply high-frequency inverter exports nine level staircase waveforms and is made of above-mentioned nine kinds of states, and the frequency of staircase waveform is ω, can obtain the nine level staircase waveforms progress Fourier decomposition of single supply high-frequency inverter output：
In formula (1)：K and n is summation variable, and k=1,2,3,4, n=1,3,5 ...；VcFor triangle Carrier wave kurtosis, VmkFor HVDC Modulation wave voltage value, and 0<Vm1<Vm2<Vm3<Vm4<Vc。
The total harmonic distortion of output voltage (the total harmonic of the nine level high-frequency inverter of single supply Distortion, THD) expression formula be：
In formula (2), k and n are summation variable, and k=1,2,3,4, n=3,5,7 ....
The nine level high-frequency inverter of single supply, in selection parameter, need to meet 0<Vm1<Vm2<Vm3<Vm4<Vc, according to The expression formula selection parameter V of total harmonic distortion THD values of formula (2) output voltagem1, parameter Vm2, parameter Vm3, parameter Vm4, parameter VcTo ensure that total harmonic distortion THD values of the voltage of output are met the requirements.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention and from above-described embodiment Limitation, it is other any without departing from the change made under the principle of the invention, modification, replacement, combination, simplification, it should be equivalent and put Mode is changed, is included within protection scope of the present invention.

Claims (1)

  1. A kind of 1. nine level high-frequency inverter of single supply, it is characterised in that including：Input DC power (Vdc), first electrolysis electricity Hold (C1), the second electrolytic capacitor (C2), the first diode (VD1), the second diode (VD2), the 3rd diode (VD3), the four or two Pole pipe (VD4), the 5th diode (VD5), the 6th diode (VD6), the 7th diode (VD7), the 8th diode (VD8), the 9th Diode (VD9), the tenth diode (VD10), the 11st diode (VD11), first switch pipe (S1), second switch pipe (S2)、 3rd switching tube (S3), the 4th switching tube (S4), the 5th switching tube (S5), the 6th switching tube (S6), the 7th switching tube (S7), the 8th Switching tube (S8), the 9th switching tube (S9) and output loading (Load)；
    First electrolytic capacitor (the C1) and the second electrolytic capacitor (C2) capacitance it is equal；Input DC power (the Vdc) Cathode, the tenth diode (VD10) anode, the first diode (VD1) cathode, the second diode (VD2) cathode, first open Close pipe (S1) drain and second switch pipe (S2) drain be connected；First diode (the VD1) anode, the 11st Diode (VD11) anode and first switch pipe (S1) source class be connected；Tenth diode (the VD10) cathode, Six diode (VD6) cathode, the 8th diode (VD8) cathode, the 6th switching tube (S6) drain, the 8th switching tube (S8) Drain and the first electrolytic capacitor (C1) cathode be connected；The 11st diode (VD11) cathode, the 4th diode (VD4) cathode, the 4th switching tube (S4) drain, the first electrolytic capacitor (C1) anode and the second electrolytic capacitor (C2) Cathode is connected；Second diode (the VD2) anode, the 3rd diode (VD3) cathode, second switch pipe (S2) source Level, the 3rd switching tube (S3) drain and the second electrolytic capacitor (C2) anode is connected；Input DC power (the Vdc) Anode, the 3rd diode (VD3) anode, the 7th diode (VD7) anode, the 9th diode (VD9) anode, the 3rd open Close pipe (S3) source class, the 7th switching tube (S7) source class and the 9th switching tube (S9) source class be connected；Four or two pole Manage (VD4) anode, the 5th diode (VD5) anode, the 4th switching tube (S4) source class and the 5th switching tube (S5) source Level is connected；5th diode (the VD5) cathode, the six or two pole (VD6) anode, the 7th diode (VD7) cathode, 5th switching tube (S5) drain, the 6th switching tube (S6) source class, the 7th switching tube (S7) drain and output loading (Load) one end is connected；8th diode (the VD8) anode, the 9th diode (VD9) cathode, the 8th switching tube (S8) source class, the 9th switching tube (S9) drain be connected with the other end of output loading (Load).
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Publication number Priority date Publication date Assignee Title
CN110138250B (en) * 2019-05-14 2020-10-27 郑州大学 Switched capacitor N-level inverter and modulation method thereof
CN110048629B (en) * 2019-05-14 2020-10-27 郑州大学 Single-input switched capacitor multi-level inverter and modulation method thereof
CN111030490B (en) * 2019-12-18 2022-11-04 南京理工大学 Nine-level inverter of boost type switched capacitor
CN111049403B (en) * 2019-12-18 2022-11-01 南京理工大学 Nine-level inverter of buck-boost type switched capacitor

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN102801349A (en) * 2012-08-14 2012-11-28 中国科学院电工研究所 Single-phase nine-level converter
CN103346690A (en) * 2013-07-05 2013-10-09 华为技术有限公司 Multi-level inverter and power supply system
CN205212724U (en) * 2015-11-30 2016-05-04 华南理工大学 Single nine level high -frequency inverter of power

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102801349A (en) * 2012-08-14 2012-11-28 中国科学院电工研究所 Single-phase nine-level converter
CN103346690A (en) * 2013-07-05 2013-10-09 华为技术有限公司 Multi-level inverter and power supply system
CN205212724U (en) * 2015-11-30 2016-05-04 华南理工大学 Single nine level high -frequency inverter of power

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