CN114726197A - Novel circulating current restraining structure of three-winding transformer - Google Patents

Novel circulating current restraining structure of three-winding transformer Download PDF

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CN114726197A
CN114726197A CN202210174508.8A CN202210174508A CN114726197A CN 114726197 A CN114726197 A CN 114726197A CN 202210174508 A CN202210174508 A CN 202210174508A CN 114726197 A CN114726197 A CN 114726197A
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winding
transformer
capacitor
switching tube
differential mode
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CN114726197B (en
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胡仁俊
李�杰
吴伟斌
张颖
韩重阳
唐婷
郑泽锋
胡智标
马宝淇
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South China Agricultural University
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • 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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  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a novel circulating current restraining structure of a three-winding transformer, which comprises a first direct current power supply, a first capacitor, a second capacitor, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a three-winding transformer, a differential mode choke coil, a first leakage inductance, a fifth switching tube, a sixth switching tube, a third capacitor, a fourth capacitor and a second direct current power supply; the three-winding transformer comprises a first winding of the transformer, a second winding of the transformer and a third winding of the transformer; the differential mode choke coil comprises a first differential mode choke coil winding and a second differential mode choke coil winding; wherein the differential mode choke is integrated into a three winding transformer-dual active bridge transformer. The differential mode choke coil is integrated into a three-winding transformer-double-active-bridge transformer, and the circular current in the TWT-DAB is restrained through the inductance generated by the differential mode.

Description

Novel circulating current restraining structure of three-winding transformer
Technical Field
The invention belongs to the technical field of three-winding transformers, and particularly relates to a novel circulating current restraining structure of a three-winding transformer.
Background
A Dual Active Bridge (DAB) converter is one of the most popular DC-DC converters at present, and has the characteristics of bidirectional power flow, soft switching, high power density, and the like. By adjusting the phase shift angle across the leakage inductance, the transmission power of the DAB converter can be adjusted. For conventional voltage fed DAB, if the voltage amplitudes across the transformer do not match, this can lead to increased current stress and possibly loss of soft switching. However, wide voltage regulation capability is a fundamental requirement for battery charging and discharging applications. In order to expand the voltage regulation range, a current-fed DAB method is proposed. DAB (digital audio broadcasting) powered by current can adjust the voltage amplitude through PWM (pulse-width modulation) to ensure voltage matching. However, two dc filter inductors and one clamping capacitor are introduced, which will reduce the power density.
In order to further extend the voltage regulation range without reducing the power density, the concepts of three-winding transformer-double active bridge transformer (TWT-DAB) and two-winding transformer-double active bridge transformer (DT-DAB) have been proposed. Unlike DT-DAB, TWT-DAB employs a hybrid modulation strategy, which can achieve a wide voltage range without the need for external components. However, in TWT-DAB, three-winding loop current power due to phase shift angle difference is inevitable because the power transmission model is similar to a grid synchronous ac power grid. To overcome this problem, DT-DAB has been extensively studied due to its ability to reduce circulating current losses and power decoupling. However, the disadvantage of the DT structure is that two transformer cores require higher total power handling capability than a single core and the parametric design of the two transformers is coupled.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art and provide a novel circulating current restraining structure of a three-winding transformer, and compared with DT-DAB, the circulating current restraining structure can reduce circulating current power and decouple the transformer design.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel circulating current restraining structure of a three-winding transformer comprises a first direct-current power supply, a first capacitor, a second capacitor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a three-winding transformer, a differential mode choke coil, a first leakage inductance, a fifth switch tube, a sixth switch tube, a third capacitor, a fourth capacitor and a second direct-current power supply;
the three-winding transformer comprises a first winding of the transformer, a second winding of the transformer and a third winding of the transformer;
the differential mode choke coil comprises a differential mode choke coil first winding and a differential mode choke coil second winding;
the differential mode choke coil is integrated into a three-winding transformer-double active bridge transformer, namely the homonymous terminal of a first winding of the differential mode choke coil is connected with the source electrode of a third switching tube, and the heteronymous terminal of the first winding of the differential mode choke coil is connected with the heteronymous terminal of the first winding of the transformer; and the synonym terminal of the second winding of the differential mode choke coil is connected with the positive electrode of the second capacitor, and the synonym terminal of the second winding of the differential mode choke coil and the synonym terminal of the second winding of the transformer.
Furthermore, the anode of the first capacitor is connected with the anode of the first direct-current power supply, the cathode of the first capacitor is connected with the anode of the second capacitor, and the cathode of the second capacitor is connected with the cathode of the first direct-current power supply;
the drain electrode of the first switching tube is connected with the anode of the first capacitor, the source electrode of the first switching tube is connected with the drain electrode of the second switching tube, and the source electrode of the second switching tube is connected with the cathode of the second capacitor;
the drain electrode of the third switching tube is connected with the drain electrode of the first switching tube, the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube, and the source electrode of the fourth switching tube is connected with the source electrode of the second switching tube;
the homonymous end of the first winding of the transformer is connected with the source electrode of the third switching tube, and the heteronymous end of the first winding of the transformer is connected with the source electrode of the first switching tube;
the homonymous end of the second winding of the transformer is connected with the source electrode of the first switching tube, and the heteronymous end of the second winding of the transformer is connected with the anode of the second capacitor;
the dotted terminal of the third winding of the transformer is connected with the positive electrode of the first leakage inductance, and the different-dotted terminal of the third winding of the transformer is connected with the positive electrode of the fourth capacitor;
the negative electrode of the first leakage inductor is connected with the source electrode of the fifth switching tube, the drain electrode of the fifth switching tube is connected with the positive electrode of the third capacitor, the negative electrode of the third capacitor is connected with the positive electrode of the fourth capacitor, the negative electrode of the fourth capacitor is connected with the source electrode of the sixth switching tube, and the drain electrode of the sixth switching tube is connected with the negative electrode of the first inductor;
the positive pole of the second direct current power supply is connected with the positive pole of the third capacitor, and the negative pole of the second direct current power supply is connected with the negative pole of the fourth capacitor.
Furthermore, the number of turns of the three-winding transformer is respectively N1, N2 and N3, the ratio of the turns in the differential mode choke is N1/N2, and the three-winding transformer meets the following requirements: n is a radical of hydrogen1I1＝N2I2＝N3I3；
Wherein the magnetic flux of the differential mode choke is phi1And phi2The concrete steps are as follows:
Figure BDA0003518524460000031
wherein, B1、B2Is the magnetic flux density, AeIs a cross sectional area, mueffFor effective relative permeability, mu0Is a vacuum permeability, H1、H2Is a magnetic field, /)cIs the magnetic path length;
obtaining phi according to the relation that the turn ratio in the three-winding transformer needs to meet1＝Φ2I.e. for cancelling the common mode in differential mode chokesA magnetic flux;
common mode current flows through the windings without generating an induced voltage due to differential mode inductance LDMThe differential mode current can be effectively suppressed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the invention, the differential mode choke coil is introduced into the three-winding transformer, so that the suppression of the circulating current can be better realized; the scheme of the invention is easy to realize, and solves the problem of the parameter design of the complicated coupled double transformers.
Drawings
FIG. 1 is an overall circuit diagram of the present invention;
FIG. 2 is a schematic diagram of a DMC-TWT loop suppression architecture;
FIG. 3a shows TWT at V with DMC structurepExperimental oscillogram of forward flow at 120V;
FIG. 3b shows TWT at V with DMC structurepExperimental wave form diagram of reverse flow at 120V;
FIG. 3c shows TWT at V with DMC structurepExperimental waveform plot of forward flow at 180V;
FIG. 3d shows TWT at V with DMC structurep180V in reverse flow;
FIG. 3e shows TWT at V with DMC structurepExperimental oscillogram for forward flow at 240V;
FIG. 3f shows TWT at V with DMC structurepExperimental waveform plot of reverse flow at 240V;
FIG. 4 is a diagrammatic illustration of a prototype embodiment of the invention;
the reference numbers illustrate: 1-a first winding of a transformer; 2-a second winding of the transformer; 3-a third winding of the transformer; a 4-differential mode choke first winding; a 5-differential mode choke secondary winding.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Examples
As shown in FIG. 1, the invention relates to a novel three-winding transformerIncluding a first DC power supply VpA first capacitor Cp1A second capacitor Cp2A first switch tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4Three-winding transformer, differential mode choke coil and first leakage inductance LkThe fifth switch tube S5The sixth switching tube S6A third capacitor Cs1A fourth capacitor Cs2And a second DC power supply Vs；
The three-winding transformer comprises a first winding 1 of the transformer, a second winding 2 of the transformer and a third winding 3 of the transformer;
the differential mode choke comprises a differential mode choke first winding 4 and a differential mode choke second winding 5;
a first capacitor Cp1Positive electrode and first direct current power supply VpIs connected to the positive pole of a first capacitor Cp1And a second capacitor Cp2Is connected to the positive pole of a second capacitor Cp2Negative pole of (2) and first direct current power supply VpThe negative electrodes are connected;
first switch tube S1Drain electrode of and first capacitor Cp1Is connected with the positive pole of the first switch tube S1Source electrode of (1) and second switch tube S2Is connected with the drain electrode of the second switching tube S2Source electrode of and second capacitor Cp2The negative electrodes are connected;
third switch tube S3And the first switching tube S1Is connected with the drain of the third switching tube S3Source electrode and fourth switching tube S4Is connected with the drain electrode of the fourth switching tube S4Source electrode of and second switching tube S2The source electrodes of the two transistors are connected;
homonymous terminal of first winding of transformer and third switch tube S3Is connected with the source electrode of the transformer, the different name end of the first winding of the transformer and the first switch tube S1The source electrodes of the two-way transistor are connected;
homonymous terminal of transformer second winding and first switch tube S1Is connected with the source of the transformer, the synonym terminal of the second winding of the transformer and the second capacitor Cp2The positive electrodes of the two electrodes are connected;
as shown in FIG. 2It is shown that the differential mode choke DMC is integrated into a three-winding transformer-double active bridge transformer TWT-DAB, i.e. the dotted terminal of the first winding of the differential mode choke and the third switching tube S3The source electrodes of the differential mode choke coil are connected, and the different name end of the first winding of the differential mode choke coil is connected with the different name end of the first winding of the transformer; heteronymous terminal of second winding of differential mode choke coil and second capacitor Cp2The homonymous terminal of the second winding of the differential mode choke coil is connected with the heteronymous terminal of the second winding of the transformer.
After the structure is adopted, the defects of TWT-DAB and DT-DAB can be overcome, and the advantages of the TWT-DAB and the DT-DAB can be combined. The circulation current is effectively restrained, the transmission efficiency is improved, and the Ap value of the magnetic core is effectively reduced. Since in the differential mode choke DMC the common mode CM current flows through the two windings in opposite directions, the magnetic fluxes in the core of the differential mode choke DMC can cancel each other out, so that there is no common mode CM inductance. At the same time, the magnetic flux is accumulated by the differential mode DM current. Thus, the differential mode DM inductance is related to the magnetizing inductance, which can reduce the differential mode DM current.
Homonymous terminal and first leakage inductance L of third winding of transformerkIs connected with the positive pole of the third winding of the transformer, and the synonym terminal of the third winding of the transformer and the fourth capacitor Cs2Is connected with the anode;
first leakage inductance LkNegative pole of (1) and a fifth switching tube S5Is connected with the source electrode of the fifth switching tube S5Drain electrode of and third capacitor Cs1Is connected to the positive pole of a third capacitor Cs1Negative electrode of (2) and fourth capacitor Cs2Is connected to the positive pole of a fourth capacitor Cs2Negative electrode of (2) and sixth switching tube S6Is connected with the source electrode of the sixth switching tube S6And the first inductor LkIs connected with the cathode;
second DC power supply VsPositive pole of and third capacitor Cs1Is connected with the positive pole of a second direct current power supply VsNegative pole of (2) and a fourth capacitor Cs2Is connected with the cathode.
The number of turns of the three-winding transformer TWT is N1, N2, and N3, respectively, and the ratio of turns in the differential mode choke DMC is N1/N2, which satisfies: n is a radical of1I1＝N2I2＝N3I；
Wherein the magnetic flux phi of the differential mode choke DMC1And phi2The derivation method is as follows:
Figure BDA0003518524460000061
wherein, B1、B2As magnetic flux density, AeIs a cross-sectional area, mueffTo an effective relative permeability, mu0Is a vacuum permeability, H1、H2Is a magnetic field, /)cIs the magnetic path length;
obtaining phi according to the relation that the turn ratio in the TWT needs to meet1＝Φ2Namely, the magnetic flux of the common mode CM in the differential mode choke DMC is eliminated;
the common mode CM current may flow through the windings without generating an induced voltage. On the other hand, due to the differential mode DM inductance LDMThe differential mode DM current is effectively suppressed.
With this structure, the inductance between-n 1Vp1 and n2Vp2 can be increased from a few microhenries to a few millihenries, the circulating current power Pcir can be suppressed to one thousandth, and the circulating current loss Pcir. Thus, circulating power and circulating loss can be neglected in TWT-DAB using DMC. The DMC design is simple to implement. The turn ratio of DMC is the same as the turn ratio of TWT. In this way, the magnetic flux of the CM may be cancelled.
In this example, the specific experimental parameters are shown in table 1 below:
Figure BDA0003518524460000071
TABLE 1
The experimental waveforms for TWT with DMC structure are shown in FIGS. 3 a-3 f, and V in FIGS. 3a and 3bpForward and reverse flow waveforms at 120V; as shown in fig. 3c and 3d, the waveforms are forward and reverse flow when Vp is 180V; as shown in fig. 3e and 3f, the waveforms are for forward and reverse flow when Vp is 240V. Voltage waveform vAB、vAC、vFGVoltage waveforms at points a, B, a, C, F and G are shown, respectively. i.e. iSIs LkThe waveform can be seen to be similar to the DT prototype. The power current and the primary side direct current voltage can be independently regulated, and high circulating current power is not needed.
As shown in table 2 below, the primary side circulation loss calculation results under different structures are:
Figure BDA0003518524460000072
TABLE 2
The DT structure employs two separate magnetic cores so that there is no magnetic path between the two primary windings. Therefore, the circulating current loss is zero, but the magnetic core of the DT structure is large in volume, high in cost, and large in volume of the final product, which is not favorable for practical application. In conventional TWT structures, the phase shift angle difference between the two primary windings introduces unwanted circulating power. The circulating current loss is not negligible due to the small leakage inductance. By adopting the DMC structure, the DM inductance is increased, the DM current is reduced, and then, the circulating current loss can be reduced to mW level and can be omitted. In conclusion, the DMC-TWT structure is the best in effect at present.
Fig. 4 is a schematic diagram of a prototype of an embodiment of the present invention.
The differential mode choke coil is integrated into a three-winding transformer-double-active-bridge transformer, and the circular current in the TWT-DAB is restrained through the inductance generated by the differential mode. In the differential mode choke, the differential mode current attenuates, while the common mode current can flow without any influence. Thus, the magnetic circuit between the two primary windings can be equivalently an open circuit. The TWT-DAB equivalent circuit with DMC can be simplified to be similar to the DT-DAB equivalent circuit. Thus, the TWT with DMC can be directly substituted for the two split transformers in DT-DAB to solve the complex coupling design considerations.
It should also be noted that in the present specification, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (3)

1. A novel circulating current restraining structure of a three-winding transformer is characterized by comprising a first direct-current power supply, a first capacitor, a second capacitor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a three-winding transformer, a differential mode choke coil, a first leakage inductance, a fifth switch tube, a sixth switch tube, a third capacitor, a fourth capacitor and a second direct-current power supply;
the three-winding transformer comprises a first winding of the transformer, a second winding of the transformer and a third winding of the transformer;
the differential mode choke coil comprises a first differential mode choke coil winding and a second differential mode choke coil winding;
the differential mode choke coil is integrated into a three-winding transformer-double active bridge transformer, namely the homonymous terminal of a first winding of the differential mode choke coil is connected with the source electrode of a third switching tube, and the heteronymous terminal of the first winding of the differential mode choke coil is connected with the heteronymous terminal of the first winding of the transformer; and the synonym terminal of the second winding of the differential mode choke coil is connected with the positive electrode of the second capacitor, and the synonym terminal of the second winding of the differential mode choke coil and the synonym terminal of the second winding of the transformer.
2. The novel circulating current restraining structure of the three-winding transformer as claimed in claim 1, wherein the positive electrode of the first capacitor is connected with the positive electrode of the first direct current power supply, the negative electrode of the first capacitor is connected with the positive electrode of the second capacitor, and the negative electrode of the second capacitor is connected with the negative electrode of the first direct current power supply;
the drain electrode of the first switching tube is connected with the anode of the first capacitor, the source electrode of the first switching tube is connected with the drain electrode of the second switching tube, and the source electrode of the second switching tube is connected with the cathode of the second capacitor;
the drain electrode of the third switching tube is connected with the drain electrode of the first switching tube, the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube, and the source electrode of the fourth switching tube is connected with the source electrode of the second switching tube;
the homonymous end of the first winding of the transformer is connected with the source electrode of the third switching tube, and the heteronymous end of the first winding of the transformer is connected with the source electrode of the first switching tube;
the homonymous end of the second winding of the transformer is connected with the source electrode of the first switching tube, and the heteronymous end of the second winding of the transformer is connected with the anode of the second capacitor;
the dotted terminal of the third winding of the transformer is connected with the positive electrode of the first leakage inductance, and the different-dotted terminal of the third winding of the transformer is connected with the positive electrode of the fourth capacitor;
the negative electrode of the first leakage inductor is connected with the source electrode of the fifth switching tube, the drain electrode of the fifth switching tube is connected with the positive electrode of the third capacitor, the negative electrode of the third capacitor is connected with the positive electrode of the fourth capacitor, the negative electrode of the fourth capacitor is connected with the source electrode of the sixth switching tube, and the drain electrode of the sixth switching tube is connected with the negative electrode of the first inductor;
the positive pole of the second direct current power supply is connected with the positive pole of the third capacitor, and the negative pole of the second direct current power supply is connected with the negative pole of the fourth capacitor.
3. A novel circulating current restraining structure of a three-winding transformer according to claim 1, characterized in that the number of turns of the three-winding transformer is N1, N2 and N3 respectively, the ratio of turns in the differential mode choke is N1/N2, and the three-winding transformer satisfies the following conditions: n is a radical of1I1＝N2I2＝N3I3；
Wherein the magnetic flux phi of the differential mode choke coil1And phi2The concrete steps are as follows:
Figure FDA0003518524450000021
wherein, B1、B2Is the magnetic flux density, AeIs a cross sectional area, mueffFor effective relative permeability, mu0Is a vacuum permeability, H1、H2Is a magnetic field, /)cIs the magnetic path length;
obtaining phi according to the relation that the turn ratio in the three-winding transformer needs to meet1＝Φ2Namely, the magnetic flux of the common mode in the differential mode choke is eliminated;
the common mode current flows through the winding without generating an induced voltage due to the differential mode inductance LDMThe differential mode current can be effectively suppressed.
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CN102857084A (en) * 2012-09-28 2013-01-02 北京京仪绿能电力系统工程有限公司 Circuit and method for restraining non-insulation type inverter common mode leakage current
US20190342123A1 (en) * 2018-05-01 2019-11-07 Linear Technology Holding Llc Power over data lines system using pair of differential mode chokes for coupling dc voltage and attenuating common mode noise
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CN113992032A (en) * 2021-10-15 2022-01-28 武汉大学 Circulating current restraining method of three-port nonagon modular multilevel converter

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