CN102005957B - Single-power supply cascade multi-level converter - Google Patents
Single-power supply cascade multi-level converter Download PDFInfo
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- CN102005957B CN102005957B CN 201010534173 CN201010534173A CN102005957B CN 102005957 B CN102005957 B CN 102005957B CN 201010534173 CN201010534173 CN 201010534173 CN 201010534173 A CN201010534173 A CN 201010534173A CN 102005957 B CN102005957 B CN 102005957B
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Abstract
The invention belongs to a multi-level power converter technique, particularly relating to a topological structure of a cascade multi-level converter. In the invention, the amount of using direct current power supply is reduced under the condition of outputting the level amount which is the same as that output by the traditional cascade type converter. The implementation method is as follows: a capacitance is used to replace the direct voltage source in the traditional topology, and the capacitance voltage is maintained through disconnected charging for the capacitance. The topological structure is mainly used for a high-voltage and high-power situation, and a multi secondary transformer in the original cascade circuit is omitted. Under the condition that small harmonic wave of the traditional multi-level converter is retained and each power transistor only bears the haploid power supply voltage, sine wave output which is triple as big as power supply voltage amplitude can be obtained, and high-capacity and energy bidirectional circulation are easy to realize.
Description
Technical field:
The present invention relates to many level power inversion transformation technique, adopt the method for booting to realize the topological structure of the cascade connection multi-level current transformer of single supply.
Background technology:
The thought of multi-level converter becomes a study hotspot in high-power frequency conversion field in recent years.Many level current transformers output voltage staircase waveform, thus can make the voltage waveform of output have less harmonic wave and lower du/dt.Along with the increase of output level number, the harmonic wave of output voltage will reduce.In addition, the multi-level inverse conversion technology is at the switching loss that reduces system and conduction loss, and the EMI aspect performance of withstand voltage and system that reduces pipe is all very good.
Many level current transformers can be divided into three kinds of structural topologies such as diode-clamped, capacitor-clamped type and cascade connection type, the diode-clamped current transformer is because increasing along with level number, therefore its switching device and a large amount of increase of clamping diode meeting are only suitable for the many level topologys below five level usually.And capacitor-clamped type current transformer has the problem of the charging/discharging voltage balance of electric capacity, and when level number increases, can need more clamping capacitance, therefore also has certain weakness.The mode that the Cascade Multilevel Inverter some low pressure pwm powers of employing unit is in series realizes direct voltage output, less to harmonic pollution in electric power net, current harmonic content is lower, input power factor is higher, and needn't adopt input harmonics filter and power factor correction, comparatively extensive in high-power field application.
But concerning Cascade Multilevel Converter, can need more DC power supply when needs obtain a plurality of level, or adopt many secondary transformer respectively rectification obtain, or adopt a plurality of independent current sources.The operating frequency of many secondary transformer is power frequency, and is bulky, and line is complicated, and expensive; And adopt a plurality of independent current sources, and if adopt battery as independent current source total capacity is limited, and the voltage of battery is not high yet, is difficult for realizing large capacity, and its volume is huge especially to adopt in this way a plurality of independent rectifier power sources, and price is more expensive.This makes this kind topology be restricted on using.
The tradition cascade connection multi-level can not be realized the connection back-to-back in the AC-DC-AC power converter, and therefore the application of cascade connection multi-level also is restricted aspect frequency converter.
Summary of the invention:
In order to overcome the above-mentioned problems in the prior art, the present invention proposes all better simply single supply cascade connection multi-level current transformers of a kind of topological structure and control strategy.This topology only needing to have realized single DC power supply input seven level cascade connection multi-level current transformers, and this topology rises to output AC sine voltage amplitude and is three times in DC power supply voltage in the situation that all switching tubes only bear single times of supply voltage.This topology has realized the connection back-to-back of cascade connection multi-level current transformer.
The technical scheme that the present invention solves its technical problem employing is:
The cascade of three inverter bridge phases partly adopts 12 switching tubes to connect into three inverter bridge structures, and the DC side of the DC side of first inverter bridge and the 3rd inverter bridge connects respectively an electric capacity, direct voltage source of the direct current side joint of second inverter bridge.The negative or positive electrode of DC power supply is connected with capacitance cathode or the negative pole of the DC side of first, the 3rd inverter bridge respectively through auxiliary switch or single-way switch pipe.
The invention has the beneficial effects as follows: this topological great advantage is only to need single power supply just can obtain the multi-level circuit of three inverter bridge cascades, simultaneously this topology has significantly improved the direct voltage utilance, in the situation that switching tube only bears seven level sine voltages of three times of single times of voltage outputs and DC power supply voltage.
Advantage:
(1) the design only just can save many output isolation transformers with a power supply, so the volume of complete machine, weight reduces greatly, and cost obviously reduces.The input of circuit can directly obtain by the electrical network rectification, need not transformer.
(2) under same input voltage, improve output voltage, significantly improved the direct voltage utilance.Bear at each switching tube under the condition of supply voltage and can obtain the sinewave output that amplitude is three times of supply voltages.
(3) can realize the two-way flow of energy, save electric energy.
(4) because adopted bridge circuit, so easily realize modularization, be easy to expansion.
(5) can realize the connection back-to-back of cascade connection multi-level.
(6) frequency of switching device work is low, and loss is little, and the efficient of circuit is high, and the harmonic content in output voltage waveforms is few, compares with clamp circuit, does not need clamping diode and clamping capacitance.When the output level number was identical, required component number was few.
Description of drawings:
Fig. 1 auxiliary switch all connects the circuit topology of power cathode
Fig. 2 auxiliary switch all connects the circuit topology of positive source
Connect on Fig. 3 auxiliary switch positive source, under connect the circuit topology of power cathode
Connect on Fig. 4 auxiliary switch power cathode, under connect the circuit topology of positive source
V is direct-current input power supplying in above-mentioned figure, S11, S12, S13, S14 are the switching tube of first inverter bridge of anti-paralleled diode in belt body, S21, S22, S23, S24 are the switching tube of second inverter bridge of anti-paralleled diode in belt body, and S31, S32, S33, S34 are the switching tube of the 3rd inverter bridge of anti-paralleled diode in belt body.C1 is the DC side filter capacitor of first inverter bridge, and C3 is the DC side filter capacitor of the 3rd inverter bridge.Sc1 is the auxiliary switch of capacitor C 1, and Sc3 is the auxiliary switch of capacitor C 3.Z is output loading.D1, D2 are the diode of bidirectional switch pipe parallel combination.D3, D4 are the diode of bidirectional switch pipe tandem compound.D5, D6, D7, D8 are the diode of bidirectional switch pipe bridge formula combination.T1, T2 are the switching tube of bidirectional switch pipe parallel combination.T3, T4 are the switching tube of bidirectional switch pipe tandem compound.T5 is the switching tube of bidirectional switch pipe bridge formula combination.
Embodiment:
in Fig. 1, this topology comprises inverter bridge (1), inverter bridge (2), inverter bridge (3), auxiliary switch (4) and auxiliary switch (5), wherein inverter bridge (1) is: the collector electrode of a termination switching tube (S11) of electric capacity (C1) and the collector electrode of switching tube (S13), the emitter of the emitter of another termination switching tube (S12) and switching tube (S14), the emitter of switching tube (S11) connects the collector electrode of switching tube (S12), the emitter of switching tube (S13) connects the collector electrode of switching tube (S14), inverter bridge (2) is: the direct voltage source positive pole connects the collector electrode of switching tube (S21) and the collector electrode of switching tube (S23), negative pole connects the emitter of switching tube (S22) and the emitter of switching tube (S24), the emitter of switching tube (S21) connects the collector electrode of switching tube (S22), and the emitter of switching tube (S23) connects the collector electrode of switching tube (S24), inverter bridge (3) is: the collector electrode of a termination switching tube (S31) of electric capacity (C3) and the collector electrode of switching tube (S33), the emitter of another termination switching tube (S32) emitter and switching tube (S34), the emitter of switching tube (S31) connects the collector electrode of switching tube (S32), and the emitter of switching tube (S33) connects the current collection of switching tube (S34), auxiliary switch (4) is: be single-way switch pipe or bidirectional switch pipe, auxiliary switch (5) is: be single-way switch pipe or bidirectional switch pipe, the emitter of the switching tube (S13) of inverter bridge (1) and the collector electrode of switching tube (S14) connect the emitter of switching tube (S21) of inverter bridge (2) and the collector electrode of switching tube (S22), the emitter of the switching tube (S23) of inverter bridge (2) and the collector electrode of switching tube (S24) connect the emitter of switching tube (S31) of inverter bridge (3) and the collector electrode of switching tube (S32), the emitter of the switching tube (S11) of inverter bridge (1) and the collector electrode of switching tube (S12) connect an end of load (Ro), and the emitter of the switching tube (S33) of inverter bridge (3) and the collector electrode of switching tube (S34) connect the other end of load, the emitter of the switching tube (S12) of one termination inverter bridge (1) of auxiliary switch (4) and the emitter of switching tube (S14), the negative level of another termination DC power supply of auxiliary switch (4), the emitter of the switching tube (S32) of one termination inverter bridge (3) of auxiliary switch (5) and the emitter of switching tube (S34), the negative level of another termination DC power supply of auxiliary switch (5),
The switching tube (S21, S22, S23, S24) of the switching tube of described inverter bridge (1) (S11, S12, S13, S14), inverter bridge (2) and the switching tube (S31, S32, S33, S34) of inverter bridge (3) are for to have the switching tube of anti-paralleled diode in body or to be formed by diodeless switching tube and diode combinations in body; Auxiliary switch (4) and auxiliary switch (5) are single-way switch pipe or single-way switch combination or bidirectional switch pipe or bidirectional switch combination.
in Fig. 2, originally open up and comprise inverter bridge (1), inverter bridge (2), inverter bridge (3), auxiliary switch (4) and auxiliary switch (5), wherein inverter bridge (1) is: the collector electrode of a termination switching tube (S11) of electric capacity (C1) and the collector electrode of switching tube (S13), the emitter of the emitter of another termination switching tube (S12) and switching tube (S14), the emitter of switching tube (S11) connects the collector electrode of switching tube (S12), the emitter of switching tube (S13) connects the collector electrode of switching tube (S14), inverter bridge (2) is: the direct voltage source positive pole connects the collector electrode of switching tube (S21) and the collector electrode of switching tube (S23), negative pole connects the emitter of switching tube (S22) and the emitter of switching tube (S24), the emitter of switching tube (S21) connects the collector electrode of switching tube (S22), and the emitter of switching tube (S23) connects the collector electrode of switching tube (S24), inverter bridge (3) is: the collector electrode of a termination switching tube (S31) of electric capacity (C3) and the collector electrode of switching tube (S33), the emitter of another termination switching tube (S32) emitter and switching tube (S34), the emitter of switching tube (S31) connects the collector electrode of switching tube (S32), and the emitter of switching tube (S33) connects the current collection of switching tube (S34), auxiliary switch (4) is: the collector electrode of switching tube (Sc11) connects the collector electrode of switching tube (Sc12), auxiliary switch (5) is: the collector electrode of switching tube (Sc31) connects the collector electrode of switching tube (Sc32), the emitter of the switching tube (S13) of inverter bridge (1) and the collector electrode of switching tube (S14) connect the emitter of switching tube (S21) of inverter bridge (2) and the collector electrode of switching tube (S22), the emitter of the switching tube (S23) of inverter bridge (2) and the collector electrode of switching tube (S24) connect the emitter of switching tube (S31) of inverter bridge (3) and the collector electrode of switching tube (S32), the emitter of the switching tube (S11) of inverter bridge (1) and the collector electrode of switching tube (S12) connect an end of load (Ro), and the emitter of the switching tube (S33) of inverter bridge (3) and the collector electrode of switching tube (S34) connect the other end of load, the collector electrode of the switching tube (S11) of one termination inverter bridge (1) of auxiliary switch (4) and the collector electrode of switching tube (S13), the positive level of another termination DC power supply of auxiliary switch (4), the collector electrode of the switching tube (S31) of one termination inverter bridge (3) of auxiliary switch (5) and the collector electrode of switching tube (S33), the positive level of another termination DC power supply of auxiliary switch (5),
The switching tube (S21, S22, S23, S24) of the switching tube of described inverter bridge (1) (S11, S12, S13, S14), inverter bridge (2) and the switching tube (S31, S32, S33, S34) of inverter bridge (3) are for to have the switching tube of anti-paralleled diode in body or to be formed by diodeless switching tube and diode combinations in body; Auxiliary switch (4) and auxiliary switch (5) are single-way switch pipe or single-way switch combination or bidirectional switch pipe or bidirectional switch combination.
in Fig. 3, originally open up and comprise inverter bridge (1), inverter bridge (2), inverter bridge (3), auxiliary switch (4) and auxiliary switch (5), wherein inverter bridge (1) is: the collector electrode of a termination switching tube (S11) of electric capacity (C1) and the collector electrode of switching tube (S13), the emitter of the emitter of another termination switching tube (S12) and switching tube (S14), the emitter of switching tube (S11) connects the collector electrode of switching tube (S12), the emitter of switching tube (S13) connects the collector electrode of switching tube (S14), inverter bridge (2) is: the direct voltage source positive pole connects the collector electrode of switching tube (S21) and the collector electrode of switching tube (S23), negative pole connects the emitter of switching tube (S22) and the emitter of switching tube (S24), the emitter of switching tube (S21) connects the collector electrode of switching tube (S22), and the emitter of switching tube (S23) connects the collector electrode of switching tube (S24), inverter bridge (3) is: the collector electrode of a termination switching tube (S31) of electric capacity (C3) and the collector electrode of switching tube (S33), the emitter of another termination switching tube (S32) emitter and switching tube (S34), the emitter of switching tube (S31) connects the collector electrode of switching tube (S32), and the emitter of switching tube (S33) connects the current collection of switching tube (S34), auxiliary switch (4) is: the collector electrode of switching tube (Sc11) connects the collector electrode of switching tube (Sc12), auxiliary switch (5) is: the collector electrode of switching tube (Sc31) connects the collector electrode of switching tube (Sc32), the emitter of the switching tube (S13) of inverter bridge (1) and the collector electrode of switching tube (S14) connect the emitter of switching tube (S21) of inverter bridge (2) and the collector electrode of switching tube (S22), the emitter of the switching tube (S23) of inverter bridge (2) and the collector electrode of switching tube (S24) connect the emitter of switching tube (S31) of inverter bridge (3) and the collector electrode of switching tube (S32), the emitter of the switching tube (S11) of inverter bridge (1) and the collector electrode of switching tube (S12) connect an end of load (Ro), and the emitter of the switching tube (S33) of inverter bridge (3) and the collector electrode of switching tube (S34) connect the other end of load, the collector electrode of the switching tube (S11) of one termination inverter bridge (1) of auxiliary switch (4) and the collector electrode of switching tube (S13), the positive level of another termination DC power supply of auxiliary switch (4), the emitter of the switching tube (S32) of one termination inverter bridge (3) of auxiliary switch (5) and the emitter of switching tube (S34), the negative level of another termination DC power supply of auxiliary switch (5),
The switching tube (S21, S22, S23, S24) of the switching tube of described inverter bridge (1) (S11, S12, S13, S14), inverter bridge (2) and the switching tube (S31, S32, S33, S34) of inverter bridge (3) are for to have the switching tube of anti-paralleled diode in body or to be formed by diodeless switching tube and diode combinations in body; Auxiliary switch (4) and auxiliary switch (5) are single-way switch pipe or single-way switch combination or bidirectional switch pipe or bidirectional switch combination.
in Fig. 4, this topology belong to the cascade connection multi-level current transformer topological structure it comprise inverter bridge (1), inverter bridge (2), inverter bridge (3), auxiliary switch (4) and auxiliary switch (5), wherein inverter bridge (1) is: the collector electrode of a termination switching tube (S11) of electric capacity (C1) and the collector electrode of switching tube (S13), the emitter of the emitter of another termination switching tube (S12) and switching tube (S14), the emitter of switching tube (S11) connects the collector electrode of switching tube (S12), the emitter of switching tube (S13) connects the collector electrode of switching tube (S14), inverter bridge (2) is: the direct voltage source positive pole connects the collector electrode of switching tube (S21) and the collector electrode of switching tube (S23), negative pole connects the emitter of switching tube (S22) and the emitter of switching tube (S24), the emitter of switching tube (S21) connects the collector electrode of switching tube (S22), and the emitter of switching tube (S23) connects the collector electrode of switching tube (S24), inverter bridge (3) is: the collector electrode of a termination switching tube (S31) of electric capacity (C3) and the collector electrode of switching tube (S33), the emitter of another termination switching tube (S32) emitter and switching tube (S34), the emitter of switching tube (S31) connects the collector electrode of switching tube (S32), and the emitter of switching tube (S33) connects the current collection of switching tube (S34), auxiliary switch (4) is: the collector electrode of switching tube (Sc11) connects the collector electrode of switching tube (Sc12), auxiliary switch (5) is: the collector electrode of switching tube (Sc31) connects the collector electrode of switching tube (Sc32), the emitter of the switching tube (S13) of inverter bridge (1) and the collector electrode of switching tube (S14) connect the emitter of switching tube (S21) of inverter bridge (2) and the collector electrode of switching tube (S22), the emitter of the switching tube (S23) of inverter bridge (2) and the collector electrode of switching tube (S24) connect the emitter of switching tube (S31) of inverter bridge (3) and the collector electrode of switching tube (S32), the emitter of the switching tube (S11) of inverter bridge (1) and the collector electrode of switching tube (S12) connect an end of load (Ro), and the emitter of the switching tube (S33) of inverter bridge (3) and the collector electrode of switching tube (S34) connect the other end of load, the emitter of the switching tube (S12) of one termination inverter bridge (1) of auxiliary switch (4) and the emitter of switching tube (S14), the negative level of another termination DC power supply of auxiliary switch (4), the collector electrode of the switching tube (S31) of one termination inverter bridge (3) of auxiliary switch (5) and the collector electrode of switching tube (S33), the positive level of another termination DC power supply of auxiliary switch (5).
The switching tube (S21, S22, S23, S24) of the switching tube of described inverter bridge (1) (S11, S12, S13, S14), inverter bridge (2) and the switching tube (S31, S32, S33, S34) of inverter bridge (3) are for to have the switching tube of anti-paralleled diode in body or to be formed by diodeless switching tube and diode combinations in body; Auxiliary switch (4) and auxiliary switch (5) are single-way switch pipe or single-way switch combination or bidirectional switch pipe or bidirectional switch combination.
Claims (9)
1. single supply cascade connection multi-level current transformer is characterized in that:
This current transformer comprises inverter bridge 1, inverter bridge 2, inverter bridge 3, auxiliary switch 4 and auxiliary switch 5; Inverter bridge 1 is: first utmost point of a termination main switch S11 of capacitor C 1 and first utmost point of main switch S13, second utmost point of another termination main switch S12 and second utmost point of main switch S14, second utmost point of main switch S11 connects first utmost point of main switch S12, and second utmost point of main switch S13 connects first utmost point of main switch S14; Inverter bridge 2 is: dc power anode connects first utmost point of main switch S21 and first utmost point of main switch S23, dc power cathode connects second utmost point of main switch S22 and second utmost point of main switch S24, second utmost point of main switch S21 connects first utmost point of main switch S22, and second utmost point of main switch S23 connects first utmost point of main switch S24; Inverter bridge 3 is: first utmost point of a termination main switch S31 of capacitor C 3 and first utmost point of main switch S33, second utmost point of another termination main switch S32 second utmost point and main switch S34, second utmost point of main switch S31 connects first utmost point of main switch S32, and second utmost point of main switch S33 connects first utmost point of main switch S34; Second utmost point of the main switch S13 of inverter bridge 1 and first utmost point of main switch S14 connect second utmost point of main switch S21 of inverter bridge 2 and first utmost point of main switch S22; Second utmost point of the main switch S23 of inverter bridge 2 and first utmost point of main switch S24 connect second utmost point of main switch S31 of inverter bridge 3 and first utmost point of main switch S32; Second utmost point of the main switch S11 of inverter bridge 1 and first utmost point of main switch S12 connect the end of load Z, and second utmost point of the main switch S33 of inverter bridge 3 and first utmost point of main switch S34 connect the other end of load Z; Auxiliary switch 4 is single-way switch or bidirectional switch, an end of the capacitor C 1 of a termination inverter bridge 1 of auxiliary switch 4, the negative or positive electrode of another termination DC power supply of auxiliary switch 4; Auxiliary switch 5 is single-way switch or bidirectional switch, an end of the capacitor C 3 of a termination inverter bridge 3 of auxiliary switch 5, the negative or positive electrode of another termination DC power supply of auxiliary switch 5.
2. cascade connection multi-level current transformer according to claim 1, it is characterized in that: main switch S11, the S12 of inverter bridge 1, S13, S14, main switch S31, the S32 of main switch S21, the S22 of inverter bridge 2, S23, S24 and inverter bridge 3, S33, S34 are MOSFET.
3. cascade connection multi-level current transformer according to claim 1, it is characterized in that: main switch S11, the S12 of inverter bridge 1, S13, S14, main switch S31, the S32 of main switch S21, the S22 of inverter bridge 2, S23, S24 and inverter bridge 3, S33, S34 are that the interior diodeless switching tube of body and diode combinations form.
4. cascade connection multi-level current transformer according to claim 1 is characterized in that: auxiliary switch 4 and auxiliary switch 5 are by the switching tube and the diodes in parallel that adopt IGBT or GTO, and so latter two described parallel combination body is composed in series again.
5. cascade connection multi-level current transformer according to claim 1 is characterized in that: auxiliary switch 4 and auxiliary switch 5 are connected with diode by the switching tube that adopts IGBT or GTO or MOSFET, and so latter two described tandem compound body composes in parallel again.
6. cascade connection multi-level current transformer according to claim 1 is characterized in that: auxiliary switch 4 and auxiliary switch 5 are composed in series by the switching tube and the diode that adopt IGBT or GTO or MOSFET.
7. cascade connection multi-level current transformer according to claim 1, it is characterized in that: auxiliary switch 4 and auxiliary switch 5 compose in parallel by the IGBT without anti-paralleled diode in GTO or body.
8. cascade connection multi-level current transformer according to claim 1 is characterized in that: auxiliary switch 4 is comprised of diode D5, D6, D7, the D8 full-wave rectification bridge that consists of and the switch transistor T 5 that adopts IGBT or GTO or MOSFET: the emitter/source electrode of described switch transistor T 5 connects the anode of diode D5 and the anode of diode D6; The collector/of switch transistor T 5 connects the negative electrode of diode D7 and the negative electrode of diode D8; The anode of the negative electrode of diode D5 and diode D7 joins as an end of auxiliary switch; The anode of the negative electrode of diode D6 and diode D8 joins as the other end of auxiliary switch.
9. cascade connection multi-level current transformer according to claim 1 is characterized in that: auxiliary switch 5 is comprised of diode D5, D6, D7, the D8 full-wave rectification bridge that consists of and the switch transistor T 5 that adopts IGBT or GTO or MOSFET: the emitter/source electrode of described switch transistor T 5 connects the anode of diode D5 and the anode of diode D6; The collector/of switch transistor T 5 connects the negative electrode of diode D7 and the negative electrode of diode D8; The anode of the negative electrode of diode D5 and diode D7 joins as an end of auxiliary switch; The anode of the negative electrode of diode D6 and diode D8 joins as the other end of auxiliary switch.
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| CN102170244A (en) * | 2011-04-28 | 2011-08-31 | 燕山大学 | Cascaded multi-level current transformer of shared power supply |
| CN103001594B (en) * | 2011-09-16 | 2017-07-18 | 意法半导体研发(深圳)有限公司 | Amplifying circuit |
| CN102842953B (en) * | 2012-08-16 | 2015-04-15 | 华中科技大学 | Double-power automatic conversion switch device |
| CN102969924B (en) * | 2012-11-07 | 2015-07-22 | 燕山大学 | Novel voltage type multi-level inverter |
| CN103532420B (en) * | 2013-10-31 | 2015-07-22 | 哈尔滨工业大学 | Dual-three-level online-topology switchable inverter |
| CN103532422B (en) * | 2013-10-31 | 2015-07-22 | 哈尔滨工业大学 | Online topology-switching diode-clamped inverter |
| CN103872936A (en) * | 2014-03-24 | 2014-06-18 | 长安大学 | Single-power multi-level mixed type inverter |
| US9991790B2 (en) * | 2014-06-16 | 2018-06-05 | City University Of Hong Kong | Current control circuit |
| CN105071682A (en) * | 2015-08-04 | 2015-11-18 | 苏州弘鹏新能源有限公司 | High-reliability inverter |
| US10218285B2 (en) | 2015-10-19 | 2019-02-26 | Siemens Aktiengesellschaft | Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter |
| CN106533310B (en) * | 2016-12-30 | 2018-09-25 | 华中科技大学 | A kind of direct current biasing sinusoidal current electric machine controller |
| CN108540003B (en) * | 2018-05-18 | 2020-06-23 | 郑州大学 | Flexible T-shaped multi-level photovoltaic grid-connected inverter and modulation method thereof |
| CN108899942A (en) * | 2018-05-25 | 2018-11-27 | 李勇 | The adjustable charge/discharge control circuit of output voltage and its control method based on battery pack H bridge cascaded structure |
| CN110138005B (en) * | 2019-05-13 | 2023-02-03 | 郑州大学 | Cascaded multi-mode photovoltaic grid-connected inverter and modulation method thereof |
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