KR101665317B1 - Coupled Inductor for Current Balance - Google Patents
Coupled Inductor for Current Balance Download PDFInfo
- Publication number
- KR101665317B1 KR101665317B1 KR1020160007767A KR20160007767A KR101665317B1 KR 101665317 B1 KR101665317 B1 KR 101665317B1 KR 1020160007767 A KR1020160007767 A KR 1020160007767A KR 20160007767 A KR20160007767 A KR 20160007767A KR 101665317 B1 KR101665317 B1 KR 101665317B1
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- Prior art keywords
- conductor
- core
- inductor
- coupled inductor
- coupled
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
Abstract
Description
An embodiment of the present invention relates to a couple inductor for current balancing.
The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.
Magnetic devices typically include a magnetic core made of ferrite, iron powder or similar magnetic material. The magnetic device also includes a winding of conductive leads. The current flowing in the winding creates a magnetic field. In a typical design, the magnetic core generally has a relatively high magnetic permeability compared to the surrounding medium, e.g., air. Thus, in the presence of a magnetic core, the magnetic flux is confined to the magnetic core that forms the flux closure path.
The two windings of the couple inductor are magnetically coupled together. The two couple windings may be wound on at least one or more magnetic cores, e.g., a toroidal core. The first winding generates a first magnetic field for driving a first magnetic field or a magnetic flux. The magnetic flux generated by the primary winding is confined to the magnetic core forming the flux closure path. Similarly, the second winding generates a second magnetic field or a second magnetic field that drives the magnetic flux
In general, the magnetic permeability of the magnetic material of the magnetic core of the couple inductor is larger than the surrounding medium. However, the coupling between the two windings of the couple inductor is not perfect. In other words, there may be a leakage path with a low permeability between the winding and the surrounding medium. Coupling between the media around the windings can create a leakage magnetic flux. Leakage magnetic flux in the equivalent circuit of a coupled inductor is replaced by a leakage inductance.
When a plurality of IGBTs (Insulated Gate Bipolar Transistors) are used in parallel, it is very important to share the current evenly. Impedance matching from the current output point to the convergence point of each device is considered for precise even distribution. However, it is technically difficult to select the device considering the imbalance of about 20% ~ 30%. On the other hand, when a large current flows, it is structurally difficult to design the output of each inductor to pass across the cores. It takes a lot of space when designing the output of each inductor to pass across the cores.
An embodiment of the present invention is to provide a coupled inductor that reduces the current imbalance of each element connected in parallel using the principle of a coupled inductor. In order to achieve this, it is an object of the present invention to provide a coupled inductor that is designed with a flat bus bar structure and reduces a current imbalance between each device to a minimum space.
This embodiment comprises: a first conductor having a predetermined length; A second conductor disposed in parallel with the first conductor and positioned to be insulated from the first conductor; And a core portion surrounding the first conductor and the second conductor and having a first core and a second core which are opposed to each other, and a core portion coupled to the first and second conductors, .
Also, the present invention provides a coupled inductor for current balancing, wherein the first core and the second core each have a horseshoe shape.
Also, an air gap is provided between the first core and the second core.
In addition, the first conductor and the second conductor each have a shape of a flat bus bar and are stacked in an insulated manner.
A first terminal located at one end of the first conductor; A second terminal located at the other end of the first conductor; A third terminal located at one end of the second conductor; And a fourth terminal located at the other end of the second conductor, wherein the other end of the first conductor is adjacent to one end of the second conductor, and one end of the second conductor is adjacent to the other end of the second conductor And a pair of inductors for current balancing.
According to another aspect of the present embodiment, there is provided an inverter for converting a DC input voltage into an AC voltage; And a coupled inductor coupled between output terminals of the inverter, wherein the coupled inductor includes a first inductor and a second inductor, wherein the first inductor and the second inductor are magnetically coupled And a power system is provided.
The first inductor may have a bus bar shape, and the second inductor may have a shape of a flat bus bar insulated in parallel with the first inductor. do.
The coupled inductor may include: a first conductor having a predetermined length; A second conductor disposed in parallel with the first conductor and positioned to be insulated from the first conductor; And a core portion surrounding the first conductor and the second conductor, the core portion including a first core and a second core which are opposed to each other.
In addition, the directions of currents flowing through the first conductor and the second conductor are opposite to each other.
The coupled inductor according to the embodiment of the present invention ideally shares the current when the IGBTs are connected in parallel, and it is possible to select a device for driving the coupled inductor without considering a margin of 20% to 30%.
In addition, since the coupled inductors have the same current stress, the lifetime of the device can be increased, while the compact inductance structure reduces the size of the power system stack.
1 shows a circuit diagram of a coupled inductor for current sharing of a load in a DC / AC power system in accordance with an embodiment of the present invention.
FIG. 2 shows a simplified equivalent circuit of each of the non-coupled inductor and coupled inductor of FIG.
FIG. 3 shows a simulation waveform showing the current flowing in each inductor of the uncoupled inductor and the coupled inductor and the difference of the current.
4 shows a conceptual diagram of a coupled inductor according to an embodiment.
5 illustrates a coupled inductor in the form of a flat bus bar of a coupled inductor according to an embodiment.
6 illustrates a magnetic core of a coupled inductor according to one embodiment.
7 shows a front view, a side view, and a plan view of a coupled inductor according to one embodiment.
8 illustrates an assembly of a coupled inductor according to one embodiment.
9 illustrates a front view, a side view, and a top view of an assembly of a coupled inductor according to one embodiment.
Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
1 shows a circuit diagram of a coupled inductor for current sharing of a load in a DC / AC power system in accordance with an embodiment of the present invention. The present embodiment can be applied to power systems of DC / DC, AC / DC, etc. of various structures. In addition, the present embodiment can be applied to various current sharing applications.
The DC /
In an embodiment of the present invention, the switching elements S 1 , S 2 , S 3 , and S 4 are insulated gate bipolar transistor (IGBT) elements. Alternatively, however, it may be various types of devices that can be controlled, such as metal oxide semiconductor field effect transistors (MOSFETs), bipolar junction transistors (BJTs), GaN transistors, SiC transistors,
The
When S 1 and S 4 are on, the
The
Coupled
In the ideal transformer of FIG. 1 (b), the output of the
The
The load is represented by a parallel connection of a capacitor and resistor connected to the output terminal of the coupled inductor, but can be represented by a combination of inductor, capacitor and resistor depending on the application. The capacitor C O provides a low impedance path for the high frequency noise generated in the
FIG. 2 shows a simplified equivalent circuit of each of the non-coupled inductor and coupled inductor of FIG.
2 (a) shows an uncoupled inductor, where R 1 and R 2 are impedances of a first conductor and a second conductor, respectively, and values thereof are unbalanced to 50 mΩ and 20 mΩ, respectively. 2 (a) shows an inductor L1 and L2 and an ammeter I (I) for measuring a current flowing in each of the inductors L 1 and L 2 when an input voltage V s1 is applied to the uncoupled inductor. is composed of 1, I 2), a voltmeter for measuring the voltage of the load (R o) (V 3) and a voltmeter (V ripple) for measuring a ripple (ripple) of the load voltage and the like. 2 (a) is a simulation circuit for predicting a current flowing in each conductor and a difference thereof when the impedance values of the first conductor and the second conductor in the uncoupled inductor are unbalanced to 50 mΩ and 20 mΩ, to be.
Fig. 2 (b) shows a coupled inductor, where R 4 and R 5 are the impedances of the fourth conductor and the fifth conductor, respectively, and their values are equivalent to the cases of imbalance of 50 mΩ and 20 mΩ, respectively. 2B shows an ammeter I 3 and I 4 for measuring a current flowing in each of the inductors L 1 -M and L 2 -M when an input voltage V s2 is applied to the coupled inductor, , it consists of a load (R o _c) a voltmeter (V ripple _c) for measuring the voltmeter (V 8) and the ripples (ripple) of the load voltage to determine the voltage of the like. FIG. 2 (b) is a simulation circuit for predicting the current flowing in each conductor and the difference when the impedance values of the first conductor and the second conductor in the coupled inductor are unbalanced to 50 mΩ and 20 mΩ, respectively.
FIG. 3 shows a simulation waveform showing the difference between the currents flowing in the inductors (L 1 , L 2 , L 1 -M and L 2 -M) and their currents in FIGS. 2 (a) and 2 (b). As shown in Fig. 1, when using IGBTs in parallel, it is very important to divide the currents evenly. In this embodiment, if the coupled inductor has two paths, the coupled inductor can reduce the current imbalance of the two devices connected in parallel using the static current sharing and dynamic current sharing principle.
3 (a) shows the currents flowing through the uncoupled inductors L 1 and L 2 of FIG. 2 (a), respectively. Figure 3 (c) shows that the difference in the currents flowing through L 1 and L 2 is (+/-) 18 A due to the imbalance of the impedance of R 1 and R 2 of the uncoupled inductor. On the other hand, FIG. 3 (b) shows the currents flowing through the coupled inductors L 3 and L 4 of FIG. 2 (b), respectively. 3 (c) shows that the difference in currents flowing through L 3 and L 4 is (+/-) 9 A due to the imbalance of the impedance of R 4 and R 5 of the coupled inductor. The reason for this difference is that the directions of the currents flowing through the inductors in the couple inductors are opposite to each other in the direction in which they pass through the magnetic core, so that when the currents flowing in the inductors fluctuate, the magnetic fields act in a direction canceling each other, This is because the imbalance is reduced. As shown in FIG. 3, by using the principle of the coupled inductor, the current imbalance of each element connected in parallel can be reduced by about 50% from 18 A to 9 A.
4 shows a conceptual diagram of a coupled inductor according to an embodiment. It is structurally difficult to design such that the output of each of the couple inductors crosses between the cores because of the large cross-sectional area of the conductor in the case of a large current. In order to improve this, a couple inductor is designed to occupy a minimum space by designing each inductor of the coupled inductor as a flat bus bar structure as in the embodiment of FIG. The coupled inductor includes a first
The coupled inductor includes a first
Since the directions of the currents flowing through the first and
5 illustrates a coupled inductor in the form of a flat bus bar of a coupled inductor according to an embodiment.
The reason why the coupled inductor is realized by the flat bus bar structure is that it is structurally difficult to design the output of each of the coupled inductors to cross between the cores because the sectional area of the conductor must be large when a large current flows, It is because it occupies. The bus bar type couple inductor includes a first
The first
The second
The
In Figure 5, the first
In Fig. 5, the second
The
The
The current of the
6 illustrates a magnetic core of a coupled inductor according to one embodiment.
The
7 shows a front view, a side view, and a plan view of a coupled inductor according to one embodiment. The front two-dot chain line of the front view of the
8 illustrates an assembly of a coupled inductor according to one embodiment. The coupled inductor includes a
The
The
In a preferred embodiment, the first
The
9 illustrates a front view, a side view, and a top view of an assembly of a coupled inductor according to one embodiment.
The front view of the coupled inductor includes a
The first and
The side view of the coupled inductor shows the
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. will be. Therefore, the embodiments of the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the embodiment of the present invention.
Claims (9)
A second conductor disposed in parallel with the first conductor and positioned to be insulated from the first conductor; And
And a core portion surrounding the first conductor and the second conductor and including a first core and a second core which are opposed to each other,
Wherein each of the first conductor and the second conductor has a shape of a flat bus bar and has a shape in which the first and second conductors are insulated from each other and overlap each other.
Wherein the first core and the second core are each in the shape of a horseshoe.
And an air gap is provided between the first core and the second core.
A first terminal located at one end of the first conductor;
A second terminal located at the other end of the first conductor;
A third terminal located at one end of the second conductor; And
And a fourth terminal located at the other end of the second conductor,
Wherein the other end of the first conductor is adjacent to one end of the second conductor and the other end of the second conductor is adjacent to the other end of the second conductor.
And a coupled induuctor coupled between output terminals of the inverter,
Wherein the coupled inductor comprises a first inductor having a plate bus bar shape and a second inductor isolated in parallel with the first inductor and having the shape of a bus bar of the flat plate, Are magnetically coupled to each other.
The coupled inductor includes:
A first conductor having a predetermined length;
A second conductor disposed in parallel with the first conductor and positioned to be insulated from the first conductor; And
A core portion surrounding the first conductor and the second conductor and having a first core and a second core facing each other,
≪ / RTI >
Wherein directions of currents of the first conductor and the second conductor are opposite to each other in a direction of passing through the core portion.
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KR1020160007767A KR101665317B1 (en) | 2016-01-21 | 2016-01-21 | Coupled Inductor for Current Balance |
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KR1020160007767A KR101665317B1 (en) | 2016-01-21 | 2016-01-21 | Coupled Inductor for Current Balance |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018202749A1 (en) * | 2017-05-03 | 2018-11-08 | Valeo Siemens Eautomotive Germany Gmbh | Inverter |
KR102428537B1 (en) * | 2021-12-27 | 2022-08-04 | 중앙제어 주식회사 | Current unbalance detection device for cables connected in parallel, and electric vehicle charger having the same |
Citations (4)
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KR20040104688A (en) * | 2002-05-03 | 2004-12-10 | 앰비언트 코오퍼레이션 | Construction of Medium Voltage Power Line Data Couplers |
JP2009016797A (en) * | 2007-06-08 | 2009-01-22 | Nec Tokin Corp | Inductor |
JP2011100819A (en) * | 2009-11-05 | 2011-05-19 | Fuji Electric Systems Co Ltd | Magnetic coupler |
JP2016001692A (en) * | 2014-06-12 | 2016-01-07 | 株式会社デンソー | Structure for arrangement of pad for power transmission and non-contact power transmission system |
-
2016
- 2016-01-21 KR KR1020160007767A patent/KR101665317B1/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20040104688A (en) * | 2002-05-03 | 2004-12-10 | 앰비언트 코오퍼레이션 | Construction of Medium Voltage Power Line Data Couplers |
JP2009016797A (en) * | 2007-06-08 | 2009-01-22 | Nec Tokin Corp | Inductor |
JP2011100819A (en) * | 2009-11-05 | 2011-05-19 | Fuji Electric Systems Co Ltd | Magnetic coupler |
JP2016001692A (en) * | 2014-06-12 | 2016-01-07 | 株式会社デンソー | Structure for arrangement of pad for power transmission and non-contact power transmission system |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018202749A1 (en) * | 2017-05-03 | 2018-11-08 | Valeo Siemens Eautomotive Germany Gmbh | Inverter |
US20200067298A1 (en) * | 2017-05-03 | 2020-02-27 | Valeo Siemens Eautomotive Germany Gmbh | Inverter |
US11025045B2 (en) | 2017-05-03 | 2021-06-01 | Valeo Siemens Eautomotive Germany Gmbh | Inverter with internal/external ferromagnetic cores |
KR102428537B1 (en) * | 2021-12-27 | 2022-08-04 | 중앙제어 주식회사 | Current unbalance detection device for cables connected in parallel, and electric vehicle charger having the same |
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