CN106899203B - Forward five-level inverter - Google Patents

Forward five-level inverter Download PDF

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Publication number
CN106899203B
CN106899203B CN201710181634.5A CN201710181634A CN106899203B CN 106899203 B CN106899203 B CN 106899203B CN 201710181634 A CN201710181634 A CN 201710181634A CN 106899203 B CN106899203 B CN 106899203B
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diode
power switch
switch tube
tube
power
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CN106899203A (en
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龚坤珊
李磊
郭伟
严潇
高扬
陶兆俊
管月
陆佳炜
郭志刚
李广强
李福印
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/297—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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 for conversion of frequency
    • 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
    • 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
    • H02M7/5387—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 in a bridge configuration
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/2932—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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 with automatic control of output voltage, current or power
    • 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)
  • Ac-Ac Conversion (AREA)

Abstract

The invention discloses a forward five-level inverter, which consists of an input direct-current power supply, a voltage dividing capacitor, a forward five-level conversion unit, a frequency converter, an output filter and an output alternating-current load which are connected in sequence; the circuit topology families of the half-wave rectification forward five-level inverter and the full-wave rectification forward five-level inverter are obtained by changing the types of the frequency converters. The invention has the advantages of less power conversion stage number, bidirectional power flow, good front-end voltage spectrum characteristic of the output filter, and the like, improves conversion efficiency and power density, reduces volume and weight, can reduce voltage stress of a switching device, and realizes high-frequency electrical isolation of an alternating current load and a direct current power supply.

Description

Forward five-level inverter
Technical Field
The invention belongs to the technical field of power electronic conversion, and particularly relates to a forward five-level inverter.
Background
The direct-alternating current (DC-AC) conversion technology refers to a conversion technology for converting direct-current electric energy into constant-voltage constant-frequency alternating-current electric energy by using a power semiconductor device, and is simply referred to as an inversion technology, and is widely applied to 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, dc-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 dc-ac multilevel dc-ac converters, while the research on high frequency isolated multilevel two-stage power conversion inverters is relatively small.
The multilevel inverter mainly has three types of topological structures: (1) diode-clamped inverters, (2) capacitor-clamped inverters, (3) cascaded inverters with independent DC power supply DC. The diode clamping type and capacitance clamping type multi-level inverter has the advantages of being suitable for occasions of high-input voltage and high-power inverters: the cascade multi-level inverter with the independent direct current power supply has the advantage of being suitable for low-input high-output voltage high-power inversion occasions. However, the diode clamping type and capacitance clamping type multi-level multi-point flat inversion technology has the defects of single topological form, no electrical isolation and the like; the cascading type multi-level inversion technology with the independent direct current power supply has the defects of complex circuit topology, low power factor of the input side, low conversion efficiency, low power density and the like.
The high-frequency link inversion technology uses a high-frequency transformer to replace a power frequency transformer in the low-frequency link inversion technology, overcomes the defects of the low-frequency inversion technology, obviously improves the characteristics of the inverter, and is widely applied by replacing the low-frequency link inverter. With the rapid development of aviation technology and avionics, the secondary power supply of an aircraft must be developed towards high power density, high efficiency and modularization; in addition, in the development and utilization of renewable energy sources, the method is suitable for inverter and fuel cell inverter of solar array and power grid parallel connection and inversion occasions such as uninterrupted power source, the high-frequency link inverter has wide application prospect, and particularly has more important application prospect in inversion occasions with higher requirements on the volume and weight of the inverter.
In the last ten years, around the high-frequency link inversion technology, a great deal of research work is done by students at home and abroad, and a great deal of valuable research results are obtained. The unidirectional Buck type high-frequency link inverter proposed by S.R. Narayana Prakask et al in 1990 is formed by cascading a DC/DC converter with high-frequency electric isolation and a Buck type inverter bridge, and has the characteristics of unidirectional power flow, three-stage power conversion (DC-HFAC-DC-LFAC), high conversion efficiency, high power device switching loss when the traditional PWM technology is adopted, high cost and the like. In 1988, yamato et al proposed a "bidirectional Buck high-frequency link inverter", which is formed by cascading a high-frequency electrical isolation inverter with a Buck type frequency converter, and the frequency converter formed by four-quadrant power switches has two or four power devices simultaneously conducted in any conduction period, and has larger conduction loss. The device has the characteristics of two-stage structure of bidirectional power flow, direct current-high-frequency pulse alternating current-low-frequency alternating current, higher efficiency, large conduction loss and the like. However, the voltage generated by the bidirectional Buck type high-frequency link inverter at the front end of the filter inductor is in a range of +/-Ui two levels or +/-Ui and 0 three levels, and the inherent defect is that the voltage stress of a power switch tube is low in consideration of expanding the selection range of a power device in a high-voltage input occasion, so that the bidirectional Buck type high-frequency link inverter is limited to be applied to the occasion of high-input voltage and high-power inverter.
Most of the high-frequency isolation type multilevel topological structures studied at present are concentrated on unidirectional Buck type high-frequency link inverters with direct current links in the middle. Except that multi-level technology is incorporated into the high frequency electrically isolated DC/DC converter. Only the voltage stress of a switching tube in the high-frequency electric isolation DC/DC converter is reduced, but the multilevel is not really realized at the front end of the output filter inductor, the voltage stress of the switching tube of the Buck type inverter bridge is not reduced, and the capacitance value of the output filter inductor is not reduced. The multi-level topology is provided on the basis of the unidirectional Buck type high-frequency link inverter, and the series of high-frequency isolation type multi-level topology application occasions are limited due to the inherent defects of the unidirectional Buck type high-frequency link inverter.
Disclosure of Invention
The invention aims to provide a forward five-level inverter.
The technical solution for realizing the purpose of the invention is as follows: the utility model provides a five level dc-to-ac converter of forward, comprises input DC power supply unit, partial pressure electric capacity, five level conversion unit of forward, frequency converter, output filter and output alternating current load that connect gradually, wherein:
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 forward five-level conversion unit is used for modulating the level generated by the voltage dividing capacitor into bipolar multi-level high-frequency pulse voltage;
the frequency converter is used for demodulating the bipolar high-frequency pulse voltage into a unipolar low-frequency pulse voltage;
the output filter is used for filtering the low-frequency pulse output by the frequency converter.
Compared with the prior art, the invention has the remarkable advantages that:
(1) The method is characterized in that the construction thought of the clamping type multi-level topology is applied to a Buck type inverter, and a high-frequency isolation transformer is inserted into an input direct-current power supply and an alternating-current load, so that electrical isolation between an input side and a load side is realized; the high-frequency isolation transformer realizes miniaturization and light weight of the converter and improves the efficiency of the converter;
(2) Compared with the traditional bidirectional Buck type high-frequency link inverter, the invention can obtain five levels at the front end of the output filter inductor, thereby reducing the voltage stress of the power switching tube, widening the selection range of the power switching tube and reducing the capacitance value of the filter inductor; in the high-voltage large-capacity inversion occasions requiring electrical isolation such as civil use, industry, national defense and the like, the inversion topology can be well adapted, and is an ideal inversion power supply solution;
(3) The high-frequency isolation transformer magnetic core can be magnetized bidirectionally in each switching period, so that the utilization rate of the transformer magnetic core is improved;
(4) The invention has the advantages of less 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 forward five-level inverter of the present invention.
Fig. 2 is a circuit topology diagram of the half-wave rectification forward five-level inverter of the present invention.
Fig. 3 is a circuit topology diagram of the full wave rectifying forward five-level inverter of the present invention.
Detailed Description
Referring to fig. 1 to 3, the forward five-level inverter of the present invention is composed of an input dc power supply unit 1, a voltage dividing capacitor 2, a forward five-level conversion unit 3, a frequency converter 4, an output filter 5 and an output ac load 6, which are sequentially connected, wherein:
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 forward five-level conversion unit 3 is used for modulating the level generated by the voltage dividing capacitor 2 into bipolar multi-level high-frequency pulse voltage;
the frequency converter 4 is used for demodulating the bipolar high-frequency pulse voltage into a unipolar low-frequency pulse voltage;
the output filter 5 is used for filtering the low-frequency pulse output from the frequency converter 4.
Further, the input dc power supply unit 1 includes an input dc power supply Ui, and the input dc power supply Ui is connected to the voltage dividing capacitor.
Further, the voltage dividing capacitor 2 includes a first voltage dividing capacitor C1, a second voltage dividing capacitor C2, a third voltage dividing capacitor C3 and a fourth voltage dividing capacitor C4; the positive electrode of the first voltage dividing capacitor C1 is connected with the positive electrode of the input direct current power supply unit Ui, the negative electrode of the first voltage dividing capacitor C1 is connected with the positive electrode of the second voltage dividing capacitor C2, the negative electrode of the second voltage dividing capacitor C2 is connected with the positive electrode of the third voltage dividing capacitor C3, the negative electrode of the third voltage dividing capacitor C3 is connected with the positive electrode of the fourth voltage dividing capacitor C4, and the negative electrode of the fourth voltage dividing capacitor C4 is connected with the reference negative electrode of the input direct current power supply Ui.
Further, the forward fifth level conversion unit 3 includes a first power switch tube S1, a first diode D1, a second power switch tube S2, a second diode D2, a third power switch tube S3, a third diode D3, a fourth power switch tube S4, a fourth diode D4, a fifth power switch tube S5, a fifth diode D5, a sixth power switch tube S6, a sixth diode D6, a seventh power switch tube S7, a seventh diode D7, an eighth power switch tube S8, an eighth diode D8, a ninth power switch tube S9, a ninth diode D9, a tenth power switch tube S10, a tenth diode D10, an eleventh diode D11, a twelfth diode D12, a thirteenth diode D13, a fourteenth diode D14, a fifteenth diode D15, a sixteenth diode D16, a seventeenth diode D17, an eighteenth diode D18, a high-frequency isolation transformer T first side isolation transformer N1, a second winding side high-frequency isolation transformer T side winding side high-frequency isolation transformer T side high-frequency isolation transformer;
the drain electrode of the first power switch tube S1 is connected with the positive electrode of the first voltage dividing capacitor C1, the first diode D1 is connected in anti-parallel with the two ends of the first power switch tube S1, namely the cathode of the first diode D1 is connected with the drain electrode of the first power switch tube S1, the anode of the first diode D1 is connected with the source electrode of the first power switch tube S1, the source electrode of the first power switch tube S1 is connected with the drain electrode of the second power switch tube S2, the second diode D2 is connected in anti-parallel with the two ends of the second power switch tube S2, namely the cathode of the second diode D2 is connected with the drain electrode of the second power switch tube S2, the anode of the second diode D2 is connected with the source electrode of the second power switch tube S2, the source electrode of the second power switch tube S2 is connected with the drain electrode of the third power switch tube S3, the thirdThe diode D3 is connected in anti-parallel with two ends of the third power switch tube S3, namely, the cathode of the third diode D3 is connected with the drain electrode of the third power switch tube S3, the anode of the third diode D3 is connected with the source electrode of the third power switch tube S3, the source electrode of the third power switch tube S3 is connected with the homonymous end of the first primary winding N1, the non-homonymous end of the first primary winding N1 is connected with the drain electrode of the fourth power switch tube S4, the fourth diode D4 is connected in anti-parallel with two ends of the fourth power switch tube S4, namely, the cathode of the fourth diode D4 is connected with the drain electrode of the fourth power switch tube S4, the source electrode of the fourth power switch tube S4 is connected with the cathode of the fourth voltage dividing capacitor C4, the drain electrode of the fifth power switch tube S5 is connected with the anode of the first voltage dividing capacitor C1, the fifth diode D5 is connected in anti-parallel with two ends of the fifth power switch tube S5, namely, the cathode of the fifth diode D5 is connected with the drain electrode of the fifth power switch tube S5, the anode of the fifth diode D5 is connected with the source electrode of the fifth power switch tube S5, the source electrode of the fifth power switch tube S5 is connected with the non-homonymous end of the second primary winding N2, the homonymous end of the second primary winding N2 is connected with the drain electrode of the sixth power switch tube S6, the sixth diode D6 is connected with the two ends of the sixth power switch tube S6 in anti-parallel, namely, the cathode of the sixth diode D6 is connected with the drain electrode of the sixth power switch tube S6, the anode of the sixth diode D6 is connected with the source electrode of the sixth power switch tube S6, the source electrode of the sixth power switch tube S6 is connected with the drain electrode of the seventh power switch tube S7, the seventh diode D7 is connected with the two ends of the seventh power switch tube S7 in anti-parallel, namely, the cathode of the seventh diode D7 is connected with the drain electrode of the seventh power switch tube S7, the anode of the seventh diode D7 is connected with the source electrode of the seventh power switch tube S7, the source electrode of the seventh power switch tube S7 is connected with the drain electrode of the eighth power switch tube S8, the eighth diode D8 is in anti-parallel connection with the two ends of the eighth power switch tube S8, namely the cathode of the eighth diode D8 is connected with the drain electrode of the eighth power switch tube S8, the anode of the eighth diode D8 is connected with the source electrode of the eighth power switch tube S8, the source electrode of the eighth power switch tube S8 is connected with the cathode of the fourth voltage division capacitor C4, the drain electrode of the ninth power switch tube S9 is connected with the drain electrode of the fourth power switch tube S4, and the ninth diode D9 is in anti-parallel connection with the two ends of the ninth power switch tube S9, namely the ninth secondThe cathode of the diode D9 is connected with the drain electrode of the ninth power switch tube S9, the anode of the ninth diode D9 is connected with the source electrode of the ninth power switch tube S9, the source electrode of the ninth power switch tube S9 is connected with the anode of the eleventh diode D11, the cathode of the eleventh diode D11 is connected with the anode of the fourth voltage dividing capacitor C4, the drain electrode of the tenth power switch tube S10 is connected with the anode of the second voltage dividing capacitor C2, the tenth diode D10 is connected in anti-parallel with the two ends of the tenth power switch tube S10, namely, the cathode of the twelfth diode D10 is connected with the drain electrode of the tenth power switch tube S10, the anode of the twelfth diode D10 is connected with the source electrode of the tenth power switch tube S10, the source electrode of the tenth power switch tube S10 is connected with the anode of the twelfth diode D12, the cathode of the twelfth diode D12 is connected with the source electrode of the fifth power switch tube S5, the anode of the thirteenth diode D13 is connected with the anode of the second voltage division capacitor C2, the cathode is connected with the source electrode of the first power switch tube S1, the anode of the fourteenth diode D14 is connected with the anode of the third voltage division capacitor C3, the cathode is connected with the source electrode of the second power switch tube S2, the anode of the fifteenth diode D15 is connected with the anode of the fourth voltage division capacitor C4, the cathode is connected with the source electrode of the third power switch tube S3, the anode of the sixteenth diode D16 is connected with the drain electrode of the sixth power switch tube S6, the cathode is connected with the anode of the second voltage division capacitor C2, the anode of the seventeenth diode D17 is connected with the drain electrode of the seventh power switch tube S7, the cathode is connected with the anode of the third voltage division capacitor C3, the anode of the eighteenth diode D18 is connected with the drain electrode of the eighth power switch tube S8, and the cathode is connected with the anode of the fourth voltage division capacitor C4; the half-wave type frequency converter 4 comprises a first bidirectional power switch tube S A And a second bidirectional power switching tube S B The same-name end of the secondary winding and the first bidirectional power switching tube S A Is connected with one end of a first bidirectional power switch tube S A And the other end of the second bidirectional power switching tube S B Is connected with one end of a second bidirectional power switch tube S B And the other end of the secondary winding is connected with the non-homonymous end of the secondary winding.
Further, as shown in fig. 2, the secondary winding includes a first secondary winding N3, and the homonymous end of the first secondary winding N3 and the first bidirectional power switching tube S A Is connected with one end ofThe first two-way power switch tube S A And the other end of the second bidirectional power switching tube S B Is connected with one end of a second bidirectional power switch tube S B Is connected to the non-homonymous end of the first secondary winding N3.
The first bidirectional power switching tube S A Includes an eleventh power switch tube S a Nineteenth diode D a Twelfth power switching tube S b Twentieth diode D b Second bidirectional power switching tube S D Comprising a thirteenth power switching tube S c Twenty-first diode D c Fourteenth power switching tube S d Twenty-second diode D d Eleventh power switch tube S a Drain of (D) and nineteenth diode D a Is connected with the cathode of the first bidirectional power switch tube S A A twelfth power switch tube S connected with the same-name end of the first secondary winding N3 b Drain of (D) and twentieth diode D b Is connected with the cathode of the first bidirectional power switch tube S A And the other end of the second bidirectional power switching tube S B Connected with an eleventh power switch tube S a Source electrode of twelfth power switch tube S b Source of nineteenth diode D a Anode of twentieth diode D b Is connected together; thirteenth power switch tube S c Drain electrode of (D) and twenty-second diode D c Is simultaneously with the cathode of the twelfth power switch tube S b Drain of (D) and twentieth diode D b A fourteenth power switch tube S is connected with the cathode of the power switch tube d Drain of (D) and twenty-second diode D d A thirteenth power switch tube S connected with the cathode of the first secondary winding N3 and the non-homonymous terminal c Source electrode of fourteenth power switching tube S d Source of (E), first twenty-diode D c Anode of twenty-second diode D d Is connected together.
The output filter 5 comprises an output filter inductance Lf and an output filter capacitance Cf; one end of the output filter inductance Lf is simultaneously connected with the first bidirectional power switch tube S A And a second bidirectional power switching tube S B The other end of the output filter inductance Lf is connected with one end of the output filter capacitance Cf, the other end of the output filter capacitance Cf is connected with the non-homonymous end of the first secondary winding N3, the second bidirectional power switch tube S B Is connected with the other end of the connecting rod;
the output ac load 6 comprises an ac load Z L Ac load Z L One end of the output filter capacitor Cf and the other end of the output filter inductor Lf are connected with an alternating current load Z L The other end of the output filter capacitor Cf is connected to the other end of the output filter capacitor Cf.
Further, as shown in fig. 3, the secondary winding includes a first secondary winding N3 and a second secondary winding N4, where the same-name end of the first secondary winding N3 is identical to the first bidirectional power switching tube S A The non-homonymous end of the first secondary winding N3 is connected with the homonymous end of the second secondary winding N4, and the non-homonymous end of the second secondary winding N4 is connected with the second bidirectional power switch tube S B Is connected to one end of the connecting rod.
The first bidirectional power switching tube S A Includes an eleventh power switch tube S a Nineteenth diode D a Twelfth power switching tube S b Twentieth diode D b Second bidirectional power switching tube S D Comprising a thirteenth power switching tube S c Twenty-first diode D c Fourteenth power switching tube S d Twenty-second diode D d Eleventh power switch tube S a Drain of (D) and nineteenth diode D a Is connected with the cathode of the first bidirectional power switch tube S A A twelfth power switch tube S connected with the same-name end of the first secondary winding N3 b Drain of (D) and twentieth diode D b Is connected with the cathode of the first bidirectional power switch tube S A And the other end of the second bidirectional power switching tube S B Connected with an eleventh power switch tube S a Source electrode of twelfth power switch tube S b Source of nineteenth diode D a Anode of twentieth diode D b Is connected together; thirteenth power switch tube S c Drain electrode of (D) and twenty-second diode D c Is identical to the cathode of (2)When being connected with a non-homonymous end of the second secondary winding N4, a fourteenth power switch tube S d Drain of (D) and twenty-second diode D d Is connected with the cathode of the twelfth power switch tube S b Drain of (D) and twentieth diode D b Cathode of the thirteenth power switch tube S c Source electrode of fourteenth power switching tube S d Source of (E), first twenty-diode D c Anode of twenty-second diode D d Is connected together.
The output filter comprises an output filter inductor Lf and an output filter capacitor Cf; one end of the output filter inductance Lf is simultaneously connected with the first bidirectional power switch tube S A And a second bidirectional power switching tube S B The other end of the output filter inductor Lf is connected with one end of the output filter capacitor Cf, and the other end of the output filter capacitor Cf is connected with the non-homonymous end of the first secondary winding N3 and the homonymous end of the second secondary winding N4;
the output AC load comprises an AC load Z L Ac load Z L One end of the output filter capacitor Cf and one end of the output filter inductor Lf are connected at the same time, and the AC load Z L The other end of the output filter capacitor Cf is connected to the other end of the output filter capacitor Cf.
The basic working principle of the forward five-level inverter is as follows: the inverter can adopt an SPWM control mode. The input voltage is divided by four voltage dividing capacitors at the direct current side to obtain four levels (+Ui, +3Ui/4, +2Ui/4, +Ui/4), the divided input voltage is modulated into two-polarity and multi-level (+Ui, +3Ui/4, +2Ui/4, +Ui/4, 0, -Ui/4, -2Ui/4, -3Ui/4, -Ui) high-frequency pulse voltages u1 and u2 by a forward five-level conversion unit, and the low-frequency pulse voltages of +3 UiN/4N 1, + UiN3/4N1, + UiN3/4N1, 0, -UiN3/4N2, -2 UiN/4N 2, -3 UiN/4N 2, -UiN/N2) are output-filtered by an output filter to obtain a stable or adjustable sine voltage after being isolated and transmitted by a high-frequency isolation transformer, the frequency isolation and transmission of the high-frequency isolation transformer, the frequency isolation transformer is demodulated into a single-polarity and multi-level (+ UiN3/N1, +3 UiN/4N 1, + UiN/4N 2, and the variable-frequency pulse voltage is regulated at the four-phase voltage, so that the high-frequency pulse voltage has the capacity can be controlled at the inverting load side or the inverting circuit.

Claims (7)

1. The utility model provides a five level dc-to-ac converter of forward, its characterized in that comprises input DC power supply unit (1), partial pressure electric capacity (2), five level conversion unit (3) of forward, half-wave type frequency converter (4), output filter (5) and output alternating current load (6) that connect gradually, wherein:
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 forward five-level conversion unit (3) is used for modulating the level generated by the voltage dividing capacitor (2) into bipolar multi-level high-frequency pulse voltage;
the half-wave type frequency converter (4) is used for demodulating the bipolar high-frequency pulse voltage into a unipolar low-frequency pulse voltage;
the output filter (5) is used for filtering the low-frequency pulse output by the half-wave type frequency converter (4);
the input direct current power supply unit (1) comprises an input direct current power supply (Ui), and the input direct current power supply (Ui) is connected with the voltage dividing capacitor;
the voltage dividing capacitor (2) comprises a first voltage dividing capacitor (C1), a second voltage dividing capacitor (C2), a third voltage dividing capacitor (C3) and a fourth voltage dividing capacitor (C4); the positive electrode of the first voltage dividing capacitor (C1) is connected with the positive electrode of the input direct current power supply (Ui), the negative electrode of the first voltage dividing capacitor (C1) is connected with the positive electrode of the second voltage dividing capacitor (C2), the negative electrode of the second voltage dividing capacitor (C2) is connected with the positive electrode of the third voltage dividing capacitor (C3), the negative electrode of the third voltage dividing capacitor (C3) is connected with the positive electrode of the fourth voltage dividing capacitor (C4), and the negative electrode of the fourth voltage dividing capacitor (C4) is connected with the reference negative electrode of the input direct current power supply (Ui);
the forward five-level conversion unit (3) comprises a first power switch tube (S1), a first diode (D1), a second power switch tube (S2), a second diode (D2), a third power switch tube (S3), a third diode (D3), a fourth power switch tube (S4), a fourth diode (D4), a fifth power switch tube (S5), a fifth diode (D5), a sixth power switch tube (S6), a sixth diode (D6), a seventh power switch tube (S7), a seventh diode (D7), an eighth power switch tube (S8), an eighth diode (D8), a ninth power switch tube (S9), a ninth diode (D9), a tenth power switch tube (S10), a twelfth diode (D10), an eleventh diode (D11), a twelfth diode (D12), a thirteenth diode (D13), a fourteenth diode (D14), a fifteenth diode (D15), a sixteenth diode (D16), a seventeenth diode (D17), a seventeenth winding (D) and a high-frequency transformer (T) of a winding type transformer (N1);
the drain electrode of the first power switch tube (S1) is connected with the positive electrode of the first voltage dividing capacitor (C1), the first diode (D1) is connected in anti-parallel with the two ends of the first power switch tube (S1), namely the cathode of the first diode (D1) is connected with the drain electrode of the first power switch tube (S1), the anode of the first diode (D1) is connected with the source electrode of the first power switch tube (S1), the source electrode of the first power switch tube (S1) is connected with the drain electrode of the second power switch tube (S2), the second diode (D2) is connected in anti-parallel with the two ends of the second power switch tube (S2), namely the cathode of the second diode (D2) is connected with the drain electrode of the second power switch tube (S2), the anode of the second diode (D2) is connected with the source electrode of the second power switch tube (S2), the source electrode of the second power switch tube (S2) is connected with the drain electrode of the third power switch tube (S3), the third diode (D3) is anti-parallel connected with two ends of the third power switch tube (S3), namely, the cathode of the third diode (D3) is connected with the drain electrode of the third power switch tube (S3), the anode of the third diode (D3) is connected with the source electrode of the third power switch tube (S3), the source electrode of the third power switch tube (S3) is connected with the same-name end of the first primary winding (N1), the non-same-name end of the first primary winding (N1) is connected with the drain electrode of the fourth power switch tube (S4), the fourth diode (D4) is connected in anti-parallel with the two ends of the fourth power switch tube (S4), namely the cathode of the fourth diode (D4) is connected with the drain electrode of the fourth power switch tube (S4), the anode of the fourth diode (D4) is connected with the source electrode of the fourth power switch tube (S4), the source electrode of the fourth power switch tube (S4) is connected with the cathode of the fourth voltage division capacitor (C4), and the drain electrode of the fifth power switch tube (S5) is connected with the firstThe positive pole of the voltage dividing capacitor (C1) is connected with the positive pole of the fifth power switch tube (S5), the fifth diode (D5) is connected with the two ends of the fifth power switch tube (S5) in anti-parallel, namely the cathode of the fifth diode (D5) is connected with the drain electrode of the fifth power switch tube (S5), the anode of the fifth diode (D5) is connected with the source electrode of the fifth power switch tube (S5), the source electrode of the fifth power switch tube (S5) is connected with the non-homonymous end of the second primary winding (N2), the homonymous end of the second primary winding (N2) is connected with the drain electrode of the sixth power switch tube (S6), the sixth diode (D6) is connected with the two ends of the sixth power switch tube (S6) in anti-parallel, namely the cathode of the sixth diode (D6) is connected with the drain electrode of the sixth power switch tube (S6), the source electrode of the seventh power switch tube (S6) is connected with the drain electrode of the seventh power switch tube (S7), the source electrode of the seventh diode (S7) is connected with the two ends of the eighth power switch tube (S7) in anti-parallel, namely the seventh diode (S7) is connected with the two ends of the eighth power switch tube (S7) in anti-parallel, namely, the cathode of the eighth diode (D8) is connected with the drain of the eighth power switching tube (S8), the anode of the eighth diode (D8) is connected with the source of the eighth power switching tube (S8), the source of the eighth power switching tube (S8) is connected with the cathode of the fourth voltage dividing capacitor (C4), the drain of the ninth power switching tube (S9) is connected with the drain of the fourth power switching tube (S4), the ninth diode (D9) is connected in anti-parallel with the two ends of the ninth power switching tube (S9), namely, the cathode of the ninth diode (D9) is connected with the drain of the ninth power switching tube (S9), the anode of the ninth power switching tube (D9) is connected with the anode of the ninth power switching tube (S9), the source of the ninth power switching tube (S9) is connected with the anode of the eleventh diode (D11), the cathode of the eleventh diode (D11) is connected with the positive electrode of the fourth voltage dividing capacitor (C4), the drain of the tenth switching tube (S10) is connected with the negative electrode of the tenth diode (D10) in parallel with the two ends of the tenth diode (D10), namely, the anode of the tenth diode (D10) is connected with the twelve ends of the tenth diode (D10) in parallel with the drain of the tenth diode (D10)The source of the tenth power switching tube (S10) is connected with the anode of the twelfth diode (D12), the cathode of the twelfth diode (D12) is connected with the source of the fifth power switching tube (S5), the anode of the thirteenth diode (D13) is connected with the positive electrode of the second voltage dividing capacitor (C2), the cathode is connected with the source of the first power switching tube (S1), the anode of the fourteenth diode (D14) is connected with the positive electrode of the third voltage dividing capacitor (C3), the cathode is connected with the source of the second power switching tube (S2), the anode of the fifteenth diode (D15) is connected with the positive electrode of the fourth voltage dividing capacitor (C4), the cathode is connected with the source of the third power switching tube (S3), the anode of the sixteenth diode (D16) is connected with the drain of the sixth power switching tube (S6), the cathode is connected with the positive electrode of the second voltage dividing capacitor (C2), the anode of the seventeenth diode (D17) is connected with the drain of the seventh power switching tube (S7), the anode of the fifteenth diode (D15) is connected with the positive electrode of the eighth voltage dividing capacitor (C3), and the eighth diode (C8) is connected with the drain of the eighth voltage dividing capacitor (C8); the half-wave type frequency converter (4) comprises a first bidirectional power switch tube (S A ) And a second bidirectional power switching tube (S) B ) The same-name end of the secondary winding and the first bidirectional power switch tube (S A ) Is connected to one end of a first bidirectional power switching tube (S A ) And the other end of the second bidirectional power switching tube (S) B ) Is connected to one end of a second bidirectional power switching tube (S B ) And the other end of the secondary winding is connected with the non-homonymous end of the secondary winding.
2. The forward five-level inverter according to claim 1, wherein the secondary winding comprises a first secondary winding (N3), the homonymous terminal of the first secondary winding (N3) being connected to a first bi-directional power switch tube (S A ) Is connected to one end of a first bidirectional power switching tube (S A ) And the other end of the second bidirectional power switching tube (S) B ) Is connected to one end of a second bidirectional power switching tube (S B ) Is connected to the non-homonymous end of the first secondary winding (N3).
3. The forward five-level inverter of claim 2, wherein theFirst bidirectional power switching tube (S) A ) Comprises an eleventh power switch tube (S a ) Nineteenth diode (D) a ) Twelfth power switching tube (S) b ) Twentieth diode (D) b ) Second bidirectional power switching tube (S) D ) Comprises a thirteenth power switch tube (S c ) Twenty-first diode (D) c ) Fourteenth power switch tube (S) d ) Twenty-second diode (D) d ) Eleventh power switch tube (S) a ) Drain of (D) and nineteenth diode (D) a ) Is connected as a first bi-directional power switch tube (S A ) Is connected to the same-name end of the first secondary winding (N3), a twelfth power switching tube (S b ) Drain of (D) and twentieth diode (D) b ) Is connected as a first bi-directional power switch tube (S A ) And the other end of the second switch tube is connected with a second bidirectional power switch tube (S B ) Is connected with an eleventh power switch tube (S) a ) Source of twelfth power switching tube (S) b ) A nineteenth diode (D) a ) Anode of (D) b ) Is connected together; thirteenth power switch tube (S) c ) Drain of (D) and a twenty-first diode (D) c ) Is simultaneously with the cathode of the twelfth power switch tube (S b ) Drain of (D) and twentieth diode (D) b ) Is connected with the cathode of the fourteenth power switch tube (S d ) Drain of (D) and twenty-second diode (D) d ) Is connected to the cathode of the first secondary winding (N3) and is connected to a non-identical terminal of the thirteenth power switching transistor (S c ) Source of fourteenth power switching tube (S) d ) Is a source of a first twenty-diode (D) c ) An anode of a twenty-second diode (D) d ) Is connected together.
4. A forward five-level inverter according to claim 3, characterized in that the output filter (5) comprises an output filter inductance (Lf) and an output filter capacitance (Cf); one end of the output filter inductance (Lf) is simultaneously connected with the first bidirectional power switch tube (S) A ) And a second bidirectional power switching tube (S) B ) One end of the output filter inductance (Lf) is connected with the other end ofOne end of the output filter capacitor (Cf) is connected with the other end of the output filter capacitor (Cf) and the non-homonymous end of the first secondary winding (N3), and a second bidirectional power switch tube (S) B ) Is connected with the other end of the connecting rod;
the output ac load (6) comprises an ac load (Z L ) Ac load (Z L ) One end of the output filter capacitor (Cf) and the other end of the output filter inductor (Lf) are connected, and an AC load (Z) L ) The other end of the output filter capacitor (Cf) is connected to the other end of the output filter capacitor (Cf).
5. The forward five-level inverter according to claim 1, wherein the secondary winding comprises a first secondary winding (N3) and a second secondary winding (N4), the homonymous terminal of the first secondary winding (N3) and the first bidirectional power switching tube (S) A ) Is connected with the same name end of a second secondary winding (N4), and the non-same name end of the second secondary winding (N4) is connected with a second bidirectional power switch tube (S) B ) Is connected to one end of the connecting rod.
6. The forward five-level inverter of claim 5, wherein the first bi-directional power switching tube (S A ) Comprises an eleventh power switch tube (S a ) Nineteenth diode (D) a ) Twelfth power switching tube (S) b ) Twentieth diode (D) b ) Second bidirectional power switching tube (S) D ) Comprises a thirteenth power switch tube (S c ) Twenty-first diode (D) c ) Fourteenth power switch tube (S) d ) Twenty-second diode (D) d ) Eleventh power switch tube (S) a ) Drain of (D) and nineteenth diode (D) a ) Is connected as a first bi-directional power switch tube (S A ) Is connected to the same-name end of the first secondary winding (N3), a twelfth power switching tube (S b ) Drain of (D) and twentieth diode (D) b ) Is connected as a first bi-directional power switch tube (S A ) And the other end of the second switch tube is connected with a second bidirectional power switch tube (S B ) Is connected with an eleventh power switch tube (S) a ) Source of twelfth power switching tube (S) b ) A nineteenth diode (D) a ) Anode of (D) b ) Is connected together; thirteenth power switch tube (S) c ) Drain of (D) and a twenty-first diode (D) c ) The cathode of the second secondary winding (N4) is connected with the non-homonymous end of the second secondary winding (S d ) Drain of (D) and twenty-second diode (D) d ) Is connected to the cathode of the twelfth power switching transistor (S b ) Drain of (D) and twentieth diode (D) b ) Is connected to the cathode of the thirteenth power switching tube (S c ) Source of fourteenth power switching tube (S) d ) Is a source of a first twenty-diode (D) c ) An anode of a twenty-second diode (D) d ) Is connected together.
7. The forward five-level inverter of claim 6, wherein the output filter comprises an output filter inductance (Lf) and an output filter capacitance (Cf); one end of the output filter inductance (Lf) is simultaneously connected with the first bidirectional power switch tube (S) A ) And a second bidirectional power switching tube (S) B ) The other end of the output filter inductor (Lf) is connected with one end of the output filter capacitor (Cf), and the other end of the output filter capacitor (Cf) is connected with the non-homonymous end of the first secondary winding (N3) and the homonymous end of the second secondary winding (N4);
the output ac load comprises an ac load (Z L ) Ac load (Z L ) Is connected to one end of the output filter capacitor (Cf) and one end of the output filter inductor (Lf), and is connected to an AC load (Z) L ) The other end of the output filter capacitor (Cf) is connected to the other end of the output filter capacitor (Cf).
CN201710181634.5A 2017-03-24 2017-03-24 Forward five-level inverter Active CN106899203B (en)

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CN107359803B (en) * 2017-08-31 2019-09-13 南京理工大学 Positive activation type high-frequency isolation three-level inverter
CN107769599B (en) * 2017-11-20 2020-04-21 南京理工大学 Forward five-level inverter based on switched capacitor
CN109586551A (en) * 2018-12-17 2019-04-05 郑州云海信息技术有限公司 A kind of reduction regulation output device and method

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CN104218815A (en) * 2014-09-18 2014-12-17 南京理工大学 Current source type three-level AC/AC converter
CN105281361A (en) * 2015-09-25 2016-01-27 河海大学 Five-level double-step down grid-connected inverter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104218815A (en) * 2014-09-18 2014-12-17 南京理工大学 Current source type three-level AC/AC converter
CN105281361A (en) * 2015-09-25 2016-01-27 河海大学 Five-level double-step down grid-connected inverter

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