CN106877717B - Flyback five-level inverter - Google Patents
Flyback five-level inverter Download PDFInfo
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- CN106877717B CN106877717B CN201710181702.8A CN201710181702A CN106877717B CN 106877717 B CN106877717 B CN 106877717B CN 201710181702 A CN201710181702 A CN 201710181702A CN 106877717 B CN106877717 B CN 106877717B
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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
- H02M7/487—Neutral point clamped inverters
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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
- H02M7/53—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a flyback five-level inverter which is composed of an input direct-current power supply, a voltage dividing capacitor, a five-level conversion unit, a high-frequency isolation transformer, a frequency converter, an output filter and an output alternating-current load which are sequentially connected; the flyback five-level inverter can be well popularized to seven-level and nine-level by increasing the number of the voltage dividing capacitors and changing the five-level conversion units, so that a group of circuit topology families of the flyback multi-level inverter can be obtained. The invention has the advantages of simple circuit topology, bidirectional power flow, two-stage power conversion, small voltage stress of the power switch tube, good front-end voltage spectrum characteristic of the output filter, small volume of the output filter, strong load adaptability and the like, and is suitable for high-voltage input occasions.
Description
Technical Field
The invention belongs to the technical field of power electronic conversion, and particularly relates to a flyback five-level inverter.
Background
The direct-alternating current (DC-AC) conversion technology is a conversion technology for converting direct-current electric energy into constant-voltage constant-frequency alternating-current electric energy by applying a power semiconductor device, and is called inversion technology for short. It is widely used in national defense, industrial and mining enterprises, scientific research institutions, university laboratories and daily life. Along with development and application of new energy technology, the application of inversion technology in new energy is also increasing.
To date, research on dc-ac converters by power electronics researchers at home and abroad has mainly focused on two-level dc-ac converters such as non-electrically isolated, low-frequency and high-frequency electrically isolated converters; the research on multilevel converters is mainly focused on multilevel dc-dc, ac-ac and ac-dc converters, while the research on multilevel dc-ac converters is very small and limited to non-isolated, low frequency or medium frequency isolated multilevel dc-ac converters, and the research on inverters for high frequency isolated multilevel two-stage power conversion is relatively small.
The traditional inversion technology is usually to add a primary power frequency transformer between the inverter and the output end to adjust the voltage ratio and to be used as electrical isolation, but the power frequency transformer has the defects of large volume, audio noise generation, poor dynamic response characteristic, large volume of an output filter and the like. In 1977, mr. Espelage proposed a new concept of high-frequency chain inversion technology, and the high-frequency transformer is used to replace the power frequency transformer, so that the defect of the low-frequency inversion technology is overcome, the characteristics of the inverter are remarkably improved, and the inverter is widely applied to the market.
In the traditional two-level inverter, the switching tube bears large voltage stress, and is not suitable for high-voltage and high-power occasions. In 1977, the german scholars Holtz first proposed a three-level inverter main circuit using a switching tube to assist in neutral point clamping, and in 1980, japanese a Nabae et al developed it, a diode clamped multi-level inverter circuit was proposed. Through development of recent decades, three types of topologies are currently available for multilevel inversion technology: diode clamped inverter, flying capacitor clamped inverter, cascaded inverter with independent DC power supply DC. The former two kinds of multi-level inverters are suitable for high-input voltage high-power inverter occasions, and the latter multi-level inverters are suitable for low-input high-output voltage high-power inverter occasions. However, the diode clamping type and capacitance clamping type multi-level multipoint flat inversion technology has the defects of single topological form, no electrical isolation and the like, and the cascading type multi-level inversion technology with an independent direct current power supply has the defects of complex circuit topology, low power factor at the input side, low conversion efficiency, low power density and the like.
Disclosure of Invention
The invention aims to provide a flyback five-level inverter.
The technical scheme for realizing the purpose of the invention is as follows: a flyback five-level inverter is composed of an input direct-current power supply unit, a voltage dividing capacitor, a five-level conversion unit, a high-frequency isolation transformer, a frequency converter, an output filter and an output alternating-current load;
the input direct current power supply unit is used for inputting a direct current power supply;
the voltage dividing capacitor is used for equally dividing the input direct current power supply;
the five-level conversion unit is used for modulating the average divided direct current voltage into high-frequency five-level SPWM waves;
the high-frequency isolation transformer is used for realizing electric isolation of a direct current side and an alternating current side;
the frequency converter is used for modulating the isolated high-frequency five-level SPWM wave into an SPWM wave with a required frequency;
the output filter is used for filtering the SPWM wave output by the frequency converter to obtain a sine wave.
Compared with the prior art, the invention has the remarkable advantages that:
(1) The invention applies the construction thought of the clamping type multi-level topology and loop construction method to the flyback inverter circuit, and inserts the high-frequency isolation transformer into the input direct-current power supply and the alternating-current load, thereby realizing the electrical isolation between the input side and the load side, simultaneously realizing the miniaturization and the light weight of the converter and improving the efficiency of the converter;
(2) Compared with the traditional two-level inverter and the novel three-level inverter, the converter can obtain U on the high-frequency transformer i 、(3/4)U i 、(2/4)U i 、(1/4)U i 、-(N 1 /N 2 )u o Five levels improve the waveform of the output voltage and are more suitable for high-voltage and high-power occasions;
(3) The invention has the advantages of small power conversion stage number (direct current DC-high frequency alternating current HFAC-low frequency alternating current LFAC), bidirectional power flow, good front-end voltage spectrum characteristic of the output filter, and the like, thereby improving conversion efficiency and power density and reducing volume and weight.
Drawings
Fig. 1 is a circuit topology diagram of a flyback five-level inverter according to the present invention.
Fig. 2 is a circuit topology diagram of a full-wave rectifying flyback five-level inverter according to the present invention.
Detailed Description
Referring to fig. 1 and 2, a flyback five-level inverter is composed of an input dc power supply unit 1, a voltage dividing capacitor 2, a five-level conversion unit 3, a high-frequency isolation transformer 4, a frequency converter 5, an output filter 6 and an output ac load 7; the inverter can convert unstable high-voltage direct current into adjustable sine alternating current, reduce the power conversion stage number, realize high-frequency electrical isolation and is suitable for high-voltage DC/AC conversion occasions;
the input direct-current power supply unit 1 is used for inputting a direct-current power supply;
the voltage dividing capacitor 2 is used for equally dividing the input direct current power supply;
the five-level conversion unit 3 is used for modulating the average divided direct current voltage into high-frequency five-level SPWM waves;
the high-frequency isolation transformer 4 is used for realizing electric isolation of a direct current side and an alternating current side;
the frequency converter 5 is used for modulating the isolated high-frequency five-level SPWM wave into an SPWM wave with a required frequency;
the output filter 6 is used for filtering the SPWM wave output from the frequency converter 5 to obtain a sine wave.
Further, the input dc power supply unit 1 includes an input dc power supply U i The voltage dividing capacitor 2 includes a first voltage dividing capacitor C 1 Second voltage dividing capacitor C 2 A third voltage-dividing capacitor C 3 And a fourth voltage-dividing capacitor C 4 The method comprises the steps of carrying out a first treatment on the surface of the First voltage-dividing capacitor C 1 Positive electrode of (a) and input direct current power supply U i A first voltage-dividing capacitor C connected with the positive electrode of the capacitor 1 Negative electrode of (C) and second voltage dividing capacitor C 2 Is connected with the positive electrode of the second voltage dividing capacitor C 2 Negative electrode of (C) and third voltage dividing capacitor C 3 A third voltage-dividing capacitor C connected with the positive electrode of the capacitor 3 Negative electrode of (C) and fourth voltage dividing capacitor C 4 A fourth voltage-dividing capacitor C connected to the positive electrode of the capacitor 4 Is connected with the negative pole of the input DC power supply U i Is connected to the reference negative electrode of (c).
Further, the five-level conversion unit 3 includes a first power switch tube S 1 First diode D 1 Second power switch tube S 2 Second diode D 2 First two-way switch tube S A Second bidirectional switch tube S B Third bidirectional switch tube S C Ninth power switch tube S 9 Ninth diode D 9 Tenth power switching tube S 10 Twelfth pole pipe D 10 Eleventh diode D 11 Twelfth diode D 12 Thirteenth diode D 13 And a fourteenth diode D 14 The method comprises the steps of carrying out a first treatment on the surface of the The bidirectional switch tube is a switch which is formed by reversely connecting two single power switch tubes in series and bears forward and reverse voltage stress and current stress, and has bidirectional blocking capability; first two-way switch tube S A Comprises a third power switch tube S 3 Third diode D 3 Fourth power switching tube S 4 And a fourth diode D 4 Second bidirectional switch tube S B Includes a fifth power switch tube S 5 Fifth diode D 5 Sixth power switching tube S 6 And a sixth diode D 6 Third bidirectional switch tube S C Includes a seventh power switch tube S 7 Seventh diode D 7 Eighth power switch tube S 8 And an eighth diode D 8 The method comprises the steps of carrying out a first treatment on the surface of the The high frequency isolation transformer 4 comprises a primary winding N 1 A first secondary winding N 2 And a second secondary winding N 3 ；
First power switch tube S 1 Drain electrode of (C) and first voltage dividing capacitor C 1 Is connected with the positive electrode of the first diode D 1 Anti-parallel connected with the first power switch tube S 1 Two ends, i.e. first diode D 1 Cathode of (a) and first power switch tube S 1 Drain electrode connection of first diode D 1 Anode of (c) and first power switch tube S 1 Is connected with the source electrode of (a)First power switch tube S 1 Source and primary winding N 1 Is the same name as the eleventh diode D 11 Is connected with the cathode of the battery; second power switch tube S 2 Drain and primary winding N 1 Is not the same name end, tenth power switch tube S 10 Drain electrode of (D) twelfth electrode tube 10 A second power switch tube S connected with the cathode of the power switch tube 2 Source electrode of (C) and fourth voltage dividing capacitor 4 Is connected with the negative pole of the second diode D 2 Anti-parallel connected with the second power switch tube S 2 At both ends, i.e. the second diode D 2 Cathode of (a) and second power switch tube S 2 Drain electrode connection of the second diode D 2 Anode of (c) and second power switch tube S 2 Source connection of twelfth polar tube D 10 Anti-parallel connection with tenth power switch tube S 10 Two ends, namely twelfth polar tube D 10 Cathode of (c) and tenth power switch tube S 10 Drain electrode connection of twelfth electrode tube D 10 Anode and tenth power switching tube S 10 Source connection of the tenth power switch tube S 10 Source electrode of (D) twelfth polar tube 10 Anode of (D) and fourteenth diode D 14 Is connected with the anode of the battery;
third diode D 3 Cathode of (d) and third power switch tube S 3 Is simultaneously with the drain electrode of the first voltage dividing capacitor C 1 Negative electrode of (C) and second voltage dividing capacitor C 2 A fourth diode D connected to the positive electrode 4 Cathode of (d) and fourth power switching tube S 4 Is simultaneously with the drain electrode of the ninth power switch tube S 9 Drain of (D) and ninth diode D 9 A third diode D connected to the cathode of the twelfth diode D12 3 Anode of (D) fourth diode D 4 Anode of third power switch tube S 3 Source electrode of (C), fourth power switch tube S 4 Is connected together; ninth diode D 9 Anti-parallel connected with a ninth power switch tube S 9 Two ends, namely, a ninth diode D 9 Cathode of (d) and ninth power switch tube S 9 Drain electrode connection of the ninth diode D 9 Anode and ninth power switch tube S 9 Source connection of the same as the ninth power switch tube S 9 Source of (D) ninth diode D 9 And an eleventh diode D 11 Is connected with the anode of the battery; fifth diode D 5 Cathode of (c) and fifth power switch tube S 5 Is simultaneously with the second voltage dividing capacitor C 2 Negative electrode of (C), third voltage dividing capacitor (C) 3 A sixth diode D connected to the positive electrode 6 Cathode of (d) and sixth power switching tube S 6 Is simultaneously with the drain electrode of the thirteenth diode D 13 Cathode of twelfth diode D 12 The anode of the fifth diode D is connected to 5 Anode of (D) sixth diode D 6 Anode of fifth power switch tube S 5 Source electrode of (S), sixth power switch tube 6 Is connected together; seventh diode D 7 Cathode and seventh power switching tube S 7 Is simultaneously with the drain electrode of the third voltage dividing capacitor C 3 Negative electrode of (C) and fourth voltage dividing capacitor C 4 An eighth diode D connected with the positive electrode 8 Cathode and eighth power switching tube S 8 Is simultaneously with the drain electrode of the thirteenth diode D 13 Anode of fourteenth diode D 14 A seventh diode D connected to the cathode of 7 Anode of (D) eighth diode D 8 Anode of (d) seventh power switch tube S 7 Source electrode of (8), eighth power switch tube S 8 Is connected together.
Further, the cycloconverter 5 includes a fourth bidirectional switching tube S D And a fifth bidirectional switch tube S E Fourth bidirectional switch tube S D And a fifth bidirectional switch tube S E Two single power switch tubes are connected in reverse series to form a switch bearing forward and reverse voltage stress and current stress, and the switch has a bidirectional blocking function; fourth bidirectional switch tube S D Includes an eleventh power switch tube S 11 Twelfth power switching tube S 12 Fifteenth diode D 15 And a sixteenth diode D 16 Fifth two-way switch tube S E Comprising a thirteenth power switching tube S 13 Fourteenth power switching tube S 14 Seventeenth diode D 17 And an eighteenth diode D 18 The method comprises the steps of carrying out a first treatment on the surface of the Fifteenth diode D 15 Cathode and tenth of (2)A power switch tube S 11 The drain electrode of (a) is connected with the first secondary winding N 2 Is connected to the non-homonymous terminal of the sixteenth diode D 16 Cathode and twelfth power switching tube S 12 Is simultaneously with the eighteenth diode D 18 Cathode of (d) and fourteenth power switching tube S 14 A seventeenth diode D connected to the drain of 17 Cathode and thirteenth power switching tube S 13 Is simultaneously with the second secondary winding N 3 Is connected with the homonymous terminal of the fifteenth diode D 15 Anode of sixteenth diode D 16 Anode of eleventh power switching tube S 11 Source electrode of twelfth power switch tube S 12 A seventeenth diode D connected together 17 Anode of eighteenth diode D 18 Anode of thirteenth power switch tube S 13 Source electrode of fourteenth power switching tube S 14 Is connected together;
further, the output filter 6 includes an output filter capacitor C f Output filter capacitor C f Is simultaneously with the sixteenth diode D 16 Cathode of twelfth power switching tube S 12 Drain electrode of eighteenth diode D 18 Cathode of (d) and fourteenth power switching tube S 14 Is connected with the drain electrode of the output filter capacitor C f And the other end of the first secondary winding N 2 Is the same-name end and the second secondary winding N 3 Is connected with the non-homonymous end of the (C).
Further, the output ac load 7 includes an ac load Z L Ac load Z L And an output filter capacitor C f Is connected with one end of an alternating current load Z L And output filter capacitor C f Is connected with the other end of the connecting rod.
The basic working principle of the high-frequency isolation type five-level inverter is as follows: the inverter can adopt an SPWM control mode. When high voltage DC input power U i To AC load Z L When power is transmitted, input voltage U i U can be obtained after passing through a voltage dividing capacitor and a five-level conversion unit i 、3U i /4、2U i /4、U i /4、-(N 1 /N 2 )U o Five levels are separated and transmitted by a high-frequency transformer, then demodulated into low-frequency pulse voltage by a frequency converter, and output filtered by an output filter to obtain stable or adjustable sinusoidal alternating voltage u o 。
The DC side of the inverter is provided with four voltage dividing capacitors, and the closed loop control needs to sample the voltage U of the four capacitors C1 、U C2 、U C3 、U C4 And output voltage u o Ensure the balance of four capacitance voltages and output voltage u at the input side when the inverter works o The waveform quality is good. The inverter uses an active clamping pulse modulation (SPWM) chopping control mode based on voltage instantaneous value feedback control to output voltage u from the inverter o Is equal to the sampled voltage of the sinusoidal reference voltage u ref Comparing the error voltage with a proportional integral regulator to obtain an error amplified signal u e The error signal is then intersected with the sawtooth carrier wave to obtain the SPWM signal wave, and the SPWM signal and the sinusoidal basic signal wave are converted through a series of logic to obtain the driving signal of the switching tube. Sampling the voltages of the four capacitors to be U C1 、U C2 、U C3 、U C4 Comparing the four voltage values to obtain the maximum value, which selects which capacitor has the longest working time in the switching period, and which switching tubes are working and which are not working according to the selection principle of the optimal switching sequence. Selecting different combinations of capacitors according to the voltage values of the four capacitors at the input side, if U C1 Maximum value of (C) 1 、C 2 、C 3 、C 4 Providing level U i From C 1 、C 2 、C 3 Providing level (3/4) U i From C 1 ，C 2 Providing 2/4U i From C 1 Providing (1/4) U i The method comprises the steps of carrying out a first treatment on the surface of the If U is C2 Maximum value of (C) 1 、C 2 、C 3 、C 4 Providing level U i From C 1 、C 2 、C 3 Providing level (3/4) U i From C 1 ，C 2 Providing (2/4) U i From C 2 Providing (1/4) U i . If U is C3 Maximum value of (C) 1 、C 2 、C 3 、C 4 Providing level U i From C 2 、C 3 、C 4 Providing level (3/4) U i From C 3 ，C 4 Providing (2/4) U i From C 3 Providing (1/4) U i The method comprises the steps of carrying out a first treatment on the surface of the If U is C4 Maximum value of (C) 1 、C 2 、C 3 、C 4 Providing level U i From C 2 、C 3 、C 4 Providing level (3/4) U i From C 3 ，C 4 Providing (2/4) U i From C 4 Providing (1/4) U i 。
Since the inverter has four-quadrant operation capability, it can be loaded with resistive, capacitive, inductive and rectifying loads. In one output voltage period, the inverter has four working modes which respectively correspond to four quadrants, each working mode is equivalent to a Buck/Boost type high-frequency isolation converter, and the working sequence of the inverter is different under different load conditions.
Claims (5)
1. The flyback five-level inverter is characterized by comprising an input direct-current power supply unit (1), a voltage dividing capacitor (2), a five-level conversion unit (3), a high-frequency isolation transformer (4), a frequency converter (5), an output filter (6) and an output alternating-current load (7);
the input direct-current power supply unit (1) is used for inputting a direct-current power supply;
the voltage dividing capacitor (2) is used for equally dividing the input direct current power supply;
the five-level conversion unit (3) is used for modulating the average divided direct current voltage into high-frequency five-level SPWM waves;
the high-frequency isolation transformer (4) is used for realizing electric isolation of a direct current side and an alternating current side;
the frequency converter (5) is used for modulating the isolated high-frequency five-level SPWM wave into an SPWM wave with a required frequency;
the output filter (6) is used for filtering the SPWM wave output by the frequency converter (5) to obtain a sine wave;
the five-level conversion unit (3) comprises a first power switch tube (S) 1 ) First diode (D) 1 ) Second power switch tube (S) 2 ) Second diode (D) 2 ) First two-way switch tube (S) A ) Second bidirectional switch tube (S) B ) Third bidirectional switch tube (S) C ) Ninth power switch tube (S) 9 ) Ninth diode (D) 9 ) Tenth power switching tube (S) 10 ) Twelfth pole tube (D) 10 ) Eleventh diode (D) 11 ) Twelfth diode (D) 12 ) Thirteenth diode (D) 13 ) And a fourteenth diode (D) 14 ) The method comprises the steps of carrying out a first treatment on the surface of the The bidirectional switch tube is a switch which is formed by reversely connecting two single power switch tubes in series and bears forward and reverse voltage stress and current stress, and has bidirectional blocking capability; first bidirectional switch tube (S) A ) Comprises a third power switch tube (S) 3 ) Third diode (D) 3 ) Fourth power switch tube (S) 4 ) And a fourth diode (D 4 ) Second bidirectional switch tube (S) B ) Comprises a fifth power switch tube (S) 5 ) Fifth diode (D) 5 ) Sixth power switch tube (S) 6 ) And a sixth diode (D 6 ) Third bidirectional switch tube (S) C ) Comprises a seventh power switch tube (S) 7 ) Seventh diode (D) 7 ) Eighth power switch tube (S) 8 ) And an eighth diode (D 8 ) The method comprises the steps of carrying out a first treatment on the surface of the The high frequency isolation transformer (4) comprises a primary winding (N 1 ) A first secondary winding (N 2 ) And a second secondary winding (N 3 ）；
First power switch tube (S) 1 ) And a first voltage dividing capacitor (C) 1 ) Is connected with the positive electrode of the first diode (D 1 ) Anti-parallel to the first power switch tube (S) 1 ) Two ends, i.e. first diode (D 1 ) Cathode of (a) and first power switch tube (S) 1 ) Is connected with the drain of the first diode (D 1 ) Anode and first power of (2)Switch tube (S) 1 ) Is connected with the source of the first power switch tube (S 1 ) Source and primary windings (N) 1 ) And an eleventh diode (D) 11 ) Is connected with the cathode of the battery; second power switch tube (S) 2 ) Drain and primary winding (N) 1 ) Is not the same name end, tenth power switch tube (S 10 ) Drain electrode of (D) 10 ) Is connected to the cathode of the second power switch tube (S 2 ) Source of (C) and fourth voltage dividing capacitor (C) 4 ) Is connected to the negative electrode of the second diode (D 2 ) Anti-parallel connection with a second power switch tube (S) 2 ) At both ends, i.e. the second diode (D 2 ) Cathode of (a) and a second power switch tube (S) 2 ) Is connected with the drain of the second diode (D 2 ) Anode of (c) and second power switch tube (S) 2 ) Is connected to the source of the twelfth electrode tube (D 10 ) Anti-parallel connection with tenth power switch tube (S) 10 ) Two ends, namely twelfth polar tube (D 10 ) Cathode of (c) and tenth power switching tube (S) 10 ) Is connected with the drain electrode of the twelfth electrode tube (D 10 ) Anode of (c) and tenth power switching tube (S) 10 ) Is connected with the source of the tenth power switch tube (S 10 ) A source electrode of the twelfth electrode tube (D) 10 ) And a fourteenth diode (D) 14 ) Is connected with the anode of the battery;
third diode (D) 3 ) And a third power switch tube (S) 3 ) Is simultaneously with the drain electrode of the first voltage dividing capacitor (C 1 ) And a second voltage dividing capacitor (C) 2 ) Is connected with the anode of the fourth diode (D 4 ) Cathode of (c) and fourth power switch tube (S 4 ) Is simultaneously with the drain of the ninth power switch tube (S 9 ) A drain of (D) 9 ) Is connected to the cathode of the twelfth diode (D12), and the third diode (D 3 ) Anode of (D) 4 ) Anode of the third power switch tube (S) 3 ) Source of (S) fourth power switch tube 4 ) Is connected together; ninth diode (D) 9 ) Reverse-rotationParallel to a ninth power switch tube (S) 9 ) Two ends, namely, a ninth diode (D 9 ) Cathode of (c) and ninth power switch tube (S) 9 ) Is connected with the drain of the ninth diode (D 9 ) Anode of (c) and ninth power switch tube (S) 9 ) Is connected with the source of the ninth power switch tube (S 9 ) A source of (D) 9 ) And an eleventh diode (D) 11 ) Is connected with the anode of the battery; fifth diode (D) 5 ) Cathode of (c) and fifth power switch tube (S 5 ) Is simultaneously with the second voltage dividing capacitor (C) 2 ) A negative electrode of (C) and a third voltage dividing capacitor (C) 3 ) Is connected with the positive electrode of the sixth diode (D 6 ) Cathode of (c) and sixth power switching tube (S 6 ) Is simultaneously with the drain of the thirteenth diode (D 13 ) A cathode of the twelfth diode (D) 12 ) Is connected to the anode of the fifth diode (D 5 ) Anode of (D) a sixth diode (D) 6 ) Anode of fifth power switch tube (S) 5 ) Source of (S) sixth power switch tube 6 ) Is connected together; seventh diode (D) 7 ) Cathode of (c) and seventh power switch tube (S 7 ) Is simultaneously with the drain electrode of the third voltage dividing capacitor (C 3 ) And a fourth voltage dividing capacitor (C) 4 ) Is connected with the positive electrode of the eighth diode (D 8 ) Cathode of (c) and eighth power switch tube (S 8 ) Is simultaneously with the drain of the thirteenth diode (D 13 ) Anode of fourteenth diode (D) 14 ) Is connected with the cathode of the seventh diode (D 7 ) An anode of (D) 8 ) Anode of (S) 7 ) Source electrode of (S) 8 ) Is connected together;
when the high-voltage direct current is input into the power supply (U) i ) To AC load (Z) L ) When power is transmitted, input voltage U i The U is obtained after the voltage division capacitor and the five-level conversion unit i 、3U i /4、2U i /4、U i /4 、-（N 1 /N 2 ）U o Five levels ofU o To output voltage N 1 For primary winding, N 2 Is a first secondary winding.
2. Flyback five-level inverter according to claim 1, characterized in that the input dc power supply unit (1) comprises an input dc power supply (U i ) The voltage dividing capacitor (2) includes a first voltage dividing capacitor (C 1 ) A second voltage-dividing capacitor (C 2 ) A third voltage dividing capacitor (C 3 ) And a fourth voltage dividing capacitor (C 4 ) The method comprises the steps of carrying out a first treatment on the surface of the First voltage-dividing capacitor (C 1 ) Positive electrode of (a) and input DC power supply (U) i ) Is connected with the positive electrode of the first voltage-dividing capacitor (C 1 ) And a second voltage dividing capacitor (C) 2 ) A second voltage dividing capacitor (C 2 ) And a third voltage dividing capacitor (C) 3 ) A third voltage dividing capacitor (C 3 ) And a fourth voltage dividing capacitor (C) 4 ) A fourth voltage dividing capacitor (C 4 ) Is connected with the negative pole of the input DC power supply (U) i ) Is connected to the reference negative electrode of (c).
3. Flyback five-level inverter according to claim 1, characterized in that the cycloconverter (5) comprises a fourth bi-directional switching tube (S D ) And a fifth bi-directional switching tube (S) E ) Fourth bidirectional switch tube (S) D ) And a fifth bi-directional switching tube (S) E ) The two power switch tubes are connected in series in opposite directions to form a switch bearing forward and reverse voltage stress and current stress, and the switch has a bidirectional blocking function; fourth bidirectional switch tube (S) D ) Comprises an eleventh power switch tube (S 11 ) Twelfth power switching tube (S) 12 ) Fifteenth diode (D) 15 ) And a sixteenth diode (D 16 ) Fifth two-way switch tube (S) E ) Comprises a thirteenth power switch tube (S 13 ) Fourteenth power switch tube (S) 14 ) Seventeenth diode (D) 17 ) And an eighteenth diode (D) 18 ) The method comprises the steps of carrying out a first treatment on the surface of the Fifteenth diode (D) 15 ) Is of (2)Electrode and eleventh power switching tube (S) 11 ) Is connected with the first secondary winding (N 2 ) Is connected to the non-homonymous terminal of the sixteenth diode (D 16 ) Cathode of (c) and twelfth power switching tube (S 12 ) Is simultaneously with the eighteenth diode (D) 18 ) Cathode of (c) and fourteenth power switching tube (S 14 ) A seventeenth diode (D) 17 ) Cathode of (c) and thirteenth power switch tube (S 13 ) Is simultaneously with the second secondary winding (N 3 ) Is connected to the homonymous terminal of the fifteenth diode (D 15 ) Anode of sixteenth diode (D) 16 ) Is an anode of the power switch tube, an eleventh power switch tube (S 11 ) Source of twelfth power switching tube (S) 12 ) Is connected together, seventeenth diode (D 17 ) An anode of (D) 18 ) Anode of thirteenth power switch tube (S) 13 ) Source of fourteenth power switching tube (S) 14 ) Is connected together.
4. A flyback five-level inverter according to claim 3, characterized in that the output filter (6) comprises an output filter capacitor (C f ) Output filter capacitor (C) f ) Is simultaneously with one end of the sixteenth diode (D 16 ) Cathode of twelfth power switching tube (S) 12 ) Drain of eighteenth diode (D) 18 ) Cathode of (c) and fourteenth power switching tube (S 14 ) Is connected with the drain of the capacitor, and outputs a filter capacitor (C f ) And the other end of the first secondary winding (N 2 ) Is the same-name end of the second secondary winding (N 3 ) Is connected with the non-homonymous end of the (C).
5. Flyback five-level inverter according to claim 4, characterized in that the output ac load (7) comprises an ac load (Z L ) Ac load (Z L ) And an output filter capacitor (C) f ) Is connected to one end of an AC load (Z L ) And the other end of the output filter capacitor (C) f ) Is connected with the other end of the connecting rod.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103856089A (en) * | 2014-03-26 | 2014-06-11 | 南京理工大学 | High-frequency isolation-type five-level inverter |
| CN103872937A (en) * | 2014-03-31 | 2014-06-18 | 上海交通大学 | Control method of flying capacitive type five-level inverter device |
| CN104065289A (en) * | 2014-06-13 | 2014-09-24 | 南京理工大学 | Flyback high-frequency isolating type three-level inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103856089A (en) * | 2014-03-26 | 2014-06-11 | 南京理工大学 | High-frequency isolation-type five-level inverter |
| CN103872937A (en) * | 2014-03-31 | 2014-06-18 | 上海交通大学 | Control method of flying capacitive type five-level inverter device |
| CN104065289A (en) * | 2014-06-13 | 2014-09-24 | 南京理工大学 | Flyback high-frequency isolating type three-level inverter |
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