CN114726197B - Circulation current inhibition structure of novel three-winding transformer - Google Patents

Circulation current inhibition structure of novel three-winding transformer Download PDF

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CN114726197B
CN114726197B CN202210174508.8A CN202210174508A CN114726197B CN 114726197 B CN114726197 B CN 114726197B CN 202210174508 A CN202210174508 A CN 202210174508A CN 114726197 B CN114726197 B CN 114726197B
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winding
transformer
capacitor
switching tube
differential mode
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CN114726197A (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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a novel circulation suppression structure of a three-winding transformer, which comprises a first direct current power supply, a first capacitor, a second capacitor, a first switch tube, a second switch tube and 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 comprises a differential mode choke first winding and a differential mode choke second winding; wherein the differential mode choke is integrated into a three winding transformer-dual active bridge transformer. The invention integrates a differential mode choke into a three-winding transformer-double active bridge transformer, and the circulation in TWT-DAB is inhibited by the inductance generated by the differential mode.

Description

Circulation current inhibition structure of novel three-winding transformer
Technical Field
The invention belongs to the technical field of three-winding transformers, and particularly relates to a circulation suppression structure of a novel three-winding transformer.
Background
A double active bridge transformer (DAB, dual active bridge) converter is one of the most popular DC-DC converters at present, and has the characteristics of bi-directional power flow, soft switching, high power density, etc. The transmission power of the DAB converter can be adjusted by adjusting the phase shift angle at both ends of the leakage inductance. For conventional voltage-fed DAB, if the voltage magnitudes on both sides of the transformer are not matched, current stress may increase, possibly resulting in loss of soft switching. However, wide voltage regulation capability is a fundamental requirement for battery charge and discharge applications. In order to expand the voltage regulation range, a current fed DAB method is proposed. The current supply DAB can adjust the voltage amplitude through PWM modulation, so as to ensure voltage matching. However, two dc filter inductances and one clamping capacitance are introduced, which will reduce the power density.
In order to further expand the voltage regulation range without reducing the power density, concepts of a three-winding transformer-dual active bridge transformer (TWT-DAB) and a two-winding transformer-dual active bridge transformer (DT-DAB) are proposed. Unlike DT-DAB, TWT-DAB employs a hybrid modulation strategy that enables a wide voltage range without external components. However, in TWT-DAB, since the power transmission model resembles a grid-synchronous AC grid, three-winding circulating power due to phase shift angle differences is unavoidable. To overcome this problem, DT-DAB has been widely studied for its ability to reduce loop loss and power decoupling. However, the DT structure has the disadvantage that the two transformer cores require a higher total power handling capacity than a single core and the parameter designs of the two transformers are coupled.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides a novel circulating current inhibition structure of a three-winding transformer, which can reduce circulating current power and design of a decoupling transformer compared with DT-DAB.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The circulating current inhibition structure of the novel three-winding transformer 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 comprises a differential mode choke first winding and a differential mode choke second winding;
the differential mode choke is integrated into a three-winding transformer-double active bridge transformer, namely the homonymous end of the first winding of the differential mode choke is connected with the source electrode of the third switching tube, and the heteronymous end of the first winding of the differential mode choke is connected with the heteronymous end of the first winding of the transformer; the different name end of the second winding of the differential mode choke is connected with the positive electrode of the second capacitor, and the same name end of the second winding of the differential mode choke and the different name end of the second winding of the transformer.
Further, 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 positive electrode 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 negative electrode 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 same-name end of the first winding of the transformer is connected with the source electrode of the third switching tube, and the different-name end of the first winding of the transformer is connected with the source electrode of the first switching tube;
The same-name end of the second winding of the transformer is connected with the source electrode of the first switching tube, and the different-name end of the second winding of the transformer is connected with the anode of the second capacitor;
the same-name end of the third winding of the transformer is connected with the positive electrode of the first leakage inductance, and the different-name end of the third winding of the transformer is connected with the fourth capacitor and the positive electrode;
The negative electrode of the first leakage inductance 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 electrode of the second direct current power supply is connected with the positive electrode of the third capacitor, and the negative electrode of the second direct current power supply is connected with the negative electrode of the fourth capacitor.
Further, the turns of the three-winding transformer are respectively N1, N2 and N3, the revolution ratio in the differential mode choke is N1/N2, and the three-winding transformer satisfies the following conditions: n 1I1＝N2I2＝N3I3;
The magnetic fluxes Φ 1 and Φ 2 of the differential mode choke are specifically:
Wherein B 1、B2 is magnetic flux density, A e is cross-sectional area, mu eff is effective relative magnetic permeability, mu 0 is vacuum magnetic permeability, H 1、H2 is magnetic field, and l c is magnetic path length;
Obtaining phi 1＝Φ2 according to the relation to be satisfied of the turns ratio in the three-winding transformer, namely eliminating the common mode magnetic flux in the differential mode choke;
The common mode current flows through the windings without generating an induced voltage, and is effectively suppressed due to the differential mode inductance L DM.
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 circulation current can be well realized; the scheme of the invention is easy to realize, and solves the problem of complex coupling double-transformer parameter design.
Drawings
FIG. 1 is an overall circuit diagram of the present invention;
FIG. 2 is a schematic diagram of DMC-TWT loop current suppressing structure;
Fig. 3a is an experimental waveform diagram of forward flow of TWT with DMC structure at V p = 120V;
Fig. 3b is an experimental waveform diagram of reverse flow of TWT with DMC structure at V p = 120V;
Fig. 3c is an experimental waveform diagram of forward flow of TWT with DMC structure at V p = 180V;
Fig. 3d is an experimental waveform diagram of reverse flow of TWT with DMC structure at V p = 180V;
Fig. 3e is an experimental waveform diagram of forward flow of TWT with DMC structure at V p = 240V;
Fig. 3f is an experimental waveform diagram of reverse flow of TWT with DMC structure at V p = 240V;
FIG. 4 is a diagram of a prototype of an embodiment of the invention;
Reference numerals 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 choke first winding; and a 5-differential choke secondary winding.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Examples
As shown in fig. 1, the circulation suppression structure of the novel three-winding transformer comprises a first dc power supply V p, a first capacitor C p1, a second capacitor C p2, a first switching tube S 1, a second switching tube S 2, a third switching tube S 3, a fourth switching tube S 4, a three-winding transformer, a differential mode choke, a first leakage inductance L k, a fifth switching tube S 5, a sixth switching tube S 6, a third capacitor C s1, a fourth capacitor C s2 and a second dc power supply V s;
the three-winding transformer comprises a transformer first winding 1, a transformer second winding 2 and a transformer third winding 3;
the differential mode choke comprises a differential mode choke first winding 4 and a differential mode choke second winding 5;
the positive electrode of the first capacitor C p1 is connected with the positive electrode of the first direct current power supply V p, the negative electrode of the first capacitor C p1 is connected with the positive electrode of the second capacitor C p2, and the negative electrode of the second capacitor C p2 is connected with the negative electrode of the first direct current power supply V p;
the drain electrode of the first switching tube S 1 is connected with the positive electrode of the first capacitor C p1, the source electrode of the first switching tube S 1 is connected with the drain electrode of the second switching tube S 2, and the source electrode of the second switching tube S 2 is connected with the negative electrode of the second capacitor C p2;
The drain electrode of the third switching tube S 3 is connected with the drain electrode of the first switching tube S 1, the source electrode of the third switching tube S 3 is connected with the drain electrode of the fourth switching tube S 4, and the source electrode of the fourth switching tube S 4 is connected with the source electrode of the second switching tube S 2;
The homonymous end of the first winding of the transformer is connected with the source electrode of the third switching tube S 3, and the heteronymous end of the first winding of the transformer is connected with the source electrode of the first switching tube S 1;
The homonymous end of the second winding of the transformer is connected with the source electrode of the first switching tube S 1, and the heteronymous end of the second winding of the transformer is connected with the positive electrode of the second capacitor C p2;
As shown in fig. 2, the differential choke DMC is integrated into a three-winding transformer-double active bridge transformer TWT-DAB, i.e. the homonymous end of the first winding of the differential choke is connected to the source of the third switching tube S 3, and the heteronymous end of the first winding of the differential choke is connected to the heteronymous end of the first winding of the transformer; the different name end of the second winding of the differential mode choke is connected with the positive electrode of the second capacitor C p2, and the same name end of the second winding of the differential mode choke is connected with the different name end of the second winding of the transformer.
By adopting the structure, 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. Achieving effective suppression of circulating currents improves transmission efficiency and the magnetic core Ap value is effectively lowered. Since in the differential choke DMC the common mode CM current flows through the two windings in opposite directions, the magnetic fluxes in the differential choke DMC core can cancel each other out and thus there is no common mode CM inductance. Meanwhile, 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.
The same-name end of the third winding of the transformer is connected with the positive electrode of the first leakage inductance L k, and the different-name end of the third winding of the transformer is connected with the fourth capacitor C s2 and the positive electrode;
The negative electrode of the first leakage inductance L k is connected with the source electrode of the fifth switching tube S 5, the drain electrode of the fifth switching tube S 5 is connected with the positive electrode of the third capacitor C s1, the negative electrode of the third capacitor C s1 is connected with the positive electrode of the fourth capacitor C s2, the negative electrode of the fourth capacitor C s2 is connected with the source electrode of the sixth switching tube S 6, and the drain electrode of the sixth switching tube S 6 is connected with the negative electrode of the first inductor L k;
the positive electrode of the second direct current power supply V s is connected with the positive electrode of the third capacitor C s1, and the negative electrode of the second direct current power supply V s is connected with the negative electrode of the fourth capacitor C s2.
The turns of the three-winding transformer TWT are respectively N1, N2 and N3, the revolution ratio in the differential mode choke DMC is N1/N2, and the three-winding transformer TWT meets the following conditions: n 1I1＝N2I2＝N3 I;
The derivation of the magnetic fluxes Φ 1 and Φ 2 of the differential choke DMC is as follows:
Wherein B 1、B2 is magnetic flux density, A e is cross-sectional area, mu eff is effective relative magnetic permeability, mu 0 is vacuum magnetic permeability, H 1、H2 is magnetic field, and l c is magnetic path length;
Obtaining phi 1＝Φ2 according to the relation to be satisfied by the turns ratio in the TWT, namely eliminating the magnetic flux of the common mode CM in the differential mode choke DMC;
the common mode CM current may flow through the windings without generating an induced voltage. On the other hand, the differential mode DM current is effectively suppressed due to the differential mode DM inductance L DM.
With this structure, the inductance between-n 1Vp1 and n2Vp2 can be increased from a few microhenries to a few millihenries, the circulating power Pcir can be suppressed to one thousandth, and the circulating loss pcir. Thus, the circulating power and circulating loss can be ignored in TWT-DAB using DMC. The DMC design is simple to implement. The turns ratio of DMC is the same as the turns ratio of TWT. In this way, the magnetic flux of CM can be canceled.
In this example, specific experimental parameters are shown in table 1 below:
TABLE 1
The experimental waveforms of TWT with DMC structure are shown in fig. 3a to 3f, and as shown in fig. 3a and 3b, are waveforms of forward and reverse flow when V p = 120V; as shown in fig. 3c and 3d, waveforms of forward and reverse flows when vp=180v; as shown in fig. 3e and 3f, the waveforms of forward and reverse flows at vp=240V are shown. The voltage waveform v AB、vAC、vFG represents the voltage waveforms of point a, point B, point a, point C, point F, and point G, respectively. i S is the current waveform of L k, and it can be seen that the waveform is similar to the DT structure prototype. The power flow and the primary side direct current voltage can be independently adjusted without high circulating power.
As shown in the following table 2, the primary side circulation loss calculation results for different structures are:
TABLE 2
The DT structure employs two separate magnetic cores so that there is no magnetic circuit between the two primary windings. Therefore, the circulation loss is zero, but the magnetic core of the DT structure has larger volume, higher cost and larger final product volume, which is not beneficial to practical application. In a conventional TWT structure, the phase-shift angle difference between the two main windings introduces unwanted circulating power. The circulation loss is not negligible due to the small leakage inductance. With DMC structure, DM inductance increases and DM current decreases, and then circulation loss can be reduced to mW level, which can be omitted. In summary, DMC-TWT structures are currently used with the best results.
Fig. 4 is a schematic diagram of a prototype according to an embodiment of the present invention.
The invention integrates a differential mode choke into a three-winding transformer-double active bridge transformer, and the circulation in TWT-DAB is inhibited by the inductance generated by the differential mode. In the differential mode choke, the differential mode current decays, and the common mode current can flow without any influence. Thus, the magnetic circuit between the two primary windings may be equivalently open. The TWT-DAB equivalent circuit with DMC can be simplified to be similar to the DT-DAB equivalent circuit. In this way, two separate transformers in DT-DAB can be directly replaced with a TWT with DMC to solve the complex coupling design considerations.
It should also be noted that in this 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 one … …" does not exclude the presence of other like 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 (1)

1. The novel circulation suppression structure of the 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 and a third switch tube, a fourth switch tube, the 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 comprises a differential mode choke first winding and a differential mode choke second winding;
The differential mode choke is integrated into a three-winding transformer-double active bridge transformer, namely the homonymous end of the first winding of the differential mode choke is connected with the source electrode of the third switching tube, and the heteronymous end of the first winding of the differential mode choke is connected with the heteronymous end of the first winding of the transformer; the different name end of the second winding of the differential mode choke is connected with the positive electrode of the second capacitor, and the same name end of the second winding of the differential mode choke and the different name end of the second winding of the transformer;
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 positive electrode 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 negative electrode 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 same-name end of the first winding of the transformer is connected with the source electrode of the third switching tube, and the different-name end of the first winding of the transformer is connected with the source electrode of the first switching tube;
The same-name end of the second winding of the transformer is connected with the source electrode of the first switching tube, and the different-name end of the second winding of the transformer is connected with the anode of the second capacitor;
the same-name end of the third winding of the transformer is connected with the positive electrode of the first leakage inductance, and the different-name end of the third winding of the transformer is connected with the fourth capacitor and the positive electrode;
The negative electrode of the first leakage inductance 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 electrode of the second direct current power supply is connected with the positive electrode of the third capacitor, and the negative electrode of the second direct current power supply is connected with the negative electrode of the fourth capacitor;
The turns of the three-winding transformer are N 1、N2 and N 3 respectively, the revolution ratio in the differential mode choke is N 1/N2, and the three-winding transformer meets the following conditions: n 1I1＝N2I2＝N3I3;
The magnetic fluxes Φ 1 and Φ 2 of the differential mode choke are specifically:
Wherein B 1、B2 is magnetic flux density, A e is cross-sectional area, mu eff is effective relative magnetic permeability, mu 0 is vacuum magnetic permeability, H 1、H2 is magnetic field, and l c is magnetic path length;
Obtaining phi 1＝Φ2 according to the relation to be satisfied of the turns ratio in the three-winding transformer, namely eliminating the common mode magnetic flux in the differential mode choke;
The common mode current flows through the windings without generating an induced voltage, and is effectively suppressed due to the differential mode inductance L DM.
CN202210174508.8A 2022-02-24 2022-02-24 Circulation current inhibition structure of novel three-winding transformer Active CN114726197B (en)

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WO2021243613A1 (en) * 2020-06-03 2021-12-09 Johnson Electric (Guangdong) Co., Ltd. Emi filter, motor drive system and electric oil pump
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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US10652050B2 (en) * 2018-05-01 2020-05-12 Linear Technology Holding Llc Power over data lines system using split or coupled CMCs and DMCs for coupling DC voltage and attenuating common mode noise
EP3857697A4 (en) * 2018-09-27 2022-05-04 ABB Schweiz AG Apparatus for conversion between ac power and dc power

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Publication number Priority date Publication date Assignee Title
EP2365621A1 (en) * 2010-03-12 2011-09-14 Elementech International Co., Ltd. AC-TO-DC converting apparatus with EMI filtering function
CN102857084A (en) * 2012-09-28 2013-01-02 北京京仪绿能电力***工程有限公司 Circuit and method for restraining non-insulation type inverter common mode leakage current
CN111697933A (en) * 2019-03-15 2020-09-22 福特全球技术公司 Parallel power semiconductor with choke in gate path
WO2021243613A1 (en) * 2020-06-03 2021-12-09 Johnson Electric (Guangdong) Co., Ltd. Emi filter, motor drive system and electric oil pump
CN213305249U (en) * 2020-09-17 2021-05-28 陕西中科天地航空模块有限公司 Airborne DC-DC filtering surge suppression circuit
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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