CN113808818A - Electric reactor - Google Patents
Electric reactor Download PDFInfo
- Publication number
- CN113808818A CN113808818A CN202110503963.3A CN202110503963A CN113808818A CN 113808818 A CN113808818 A CN 113808818A CN 202110503963 A CN202110503963 A CN 202110503963A CN 113808818 A CN113808818 A CN 113808818A
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- Prior art keywords
- core
- reactor
- core material
- converter
- leg portion
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- 239000011162 core material Substances 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000004804 winding Methods 0.000 claims abstract description 9
- 230000007423 decrease Effects 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 230000035699 permeability Effects 0.000 claims abstract description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 13
- 229910018605 Ni—Zn Inorganic materials 0.000 claims description 4
- 230000004907 flux Effects 0.000 abstract description 19
- 238000005516 engineering process Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a reactor. Even if an alternating magnetic flux having a high frequency is generated, the performance of the reactor as a core can be suppressed from being degraded, and the reactor can be operated even at a high frequency. The reactor (12) is provided with: a core (30) having a central leg (36) and at least two outer legs; and windings (14, 16) wound around the outer leg portions (32, 34), wherein an outer peripheral portion (38) of the core (30) other than the central leg portion (36) is formed of a first core material, and the central leg portion (36) is formed of a second core material, the second core material being a material having frequency characteristics such that a decrease in magnetic permeability on a high-frequency side is more gradual than that of the first core material.
Description
Technical Field
The present technology relates to a reactor that can be used for a power conversion device such as a DC-DC converter.
Background
A DC-DC converter connected to a DC power supply for converting a voltage uses a reactor and a switch to boost or buck electric power by accumulating or releasing electric power in the form of magnetic flux. For example, in japanese patent laid-open No. 2012-065453, a converter that can be used as a power supply circuit of a hybrid vehicle is disclosed. The converter of this publication is particularly a two-phase converter using a magnetically coupled reactor. The two-phase converter uses two coils (inductors), and a current containing an ac component whose phase is shifted by a switching operation flows through each coil. In addition, the magnetic coupling reactor is an element that magnetically couples the two coils using a magnetic core having three legs. Each coil is wound around the outer leg portion so that the directions of magnetic fluxes face each other. That is, the magnetic fluxes generated by the respective coils pass through the common central leg portion in the same direction.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2012 and 065453
Disclosure of Invention
Problems to be solved by the invention
The magnetic coupling reactor of the above publication does not consider the problem when operating under a high-frequency alternating magnetic field. In particular, in the multiphase converter as in the above-described publication, assuming that the number of phases is n, a high-frequency alternating magnetic flux having a frequency n times the switching frequency appears in the center leg theoretically. The Ni — Zn-based ferrite material is a material whose permeability is difficult to decrease on the high frequency side, but at the same time, the core loss is large, and therefore, there is a problem in that the entire core is simply manufactured from the material. In this way, it is desirable that even if an alternating magnetic flux having a high frequency is generated, the performance as a core is suppressed from being degraded, and the reactor can be operated even at a high frequency.
Means for solving the problems
One aspect of the present technology is a reactor including: a core having a central leg and at least two outer legs; and a winding wound around each of the outer leg portions, wherein an outer peripheral portion of the core other than the center leg portion is formed of the first core material, and the center leg portion is formed of a second core material having frequency characteristics in which a decrease in magnetic permeability on a high-frequency side is more gradual than that of the first core material. Thus, even if an alternating magnetic flux having a higher frequency than that of the outer leg portion is generated in the center leg portion, the performance as a core can be suppressed from being lowered.
According to an embodiment, the first core material is a Mn-Zn based ferrite material and the second core material is a Ni-Zn based ferrite material. This makes it possible to reduce the core loss in the outer peripheral portion and improve the frequency characteristics of the center leg portion.
Drawings
Fig. 1 is a circuit diagram of a DC-DC buck converter including a magnetic coupling reactor according to an embodiment.
Fig. 2 is a perspective view of a magnetic coupling reactor in which a central leg portion and an outer peripheral portion are formed of different kinds of core materials as one embodiment.
Fig. 3 is a graph showing changes in the winding current of the coil and the magnetic flux of the core according to the timing of the switching operation.
Description of the reference numerals
10: a converter; 12: a reactor; 14. 16: a coil; 18. 20: a switch; 22. 24: a diode; 26. 28: a capacitor; 30: a core; 32. 34: an outer leg portion; 36: a central leg portion; 38: an outer peripheral portion.
Detailed Description
Various embodiments of the present technology will be described below with reference to the drawings. Note that, portions having substantially no difference in the following embodiments are denoted by similar reference numerals to avoid redundant description.
[ converter ]
Fig. 1 is a circuit diagram of a DC-DC buck converter 10 including a reactor 12 according to an embodiment. Although the converter 10 is described below as a two-phase buck converter, the features described in the present application can also be applied to various power conversion devices having the same configuration, such as a boost converter, a buck-boost converter, and a three-phase or higher multiphase converter. Converter 10 is connected on its input side to a dc power supply, not shown, to form a switching power supply, and receives input voltage ViIs converted into an output voltage Vo. The dc power supply can be, for example, a rechargeable secondary battery or a large-capacity capacitor. The output side of the converter 10 is connected to a load. For example, the converter 10 can be used as a power supply circuit for an alternating current motor by being combined with an inverter. The ac motor can be mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle, for example, and drives wheels.
The converter 10 comprises, in addition to the reactor 12, switches 18, 20 and diodes 22, 24. The switches 18, 20 are periodically switched on and off so that the phases are shifted by 180 degrees from each other. The reactor 12 has two coils 14 and 16 connected in series to output sides of the switches 18 and 20, respectively, and current from the dc power supply flows through the corresponding coils 14 and 16 in accordance with the switching operation of the switches 18 and 20. The switch is a switching element such as a Field Effect Transistor (FET) or an Insulated Gate Bipolar Transistor (IGBT), for example. Each diode 22, 24 is connected between the corresponding switch 18, 20 and the coil 14, 16 to return current from the load to the coil 14, 16 when the switch 18, 20 is open. The diodes 22 and 24 may be replaced with other switches (switching elements) that operate in cooperation with the switches 18 and 20.
As shown in fig. 2, the reactor 12 has a core 30, the core 30 having a central leg portion 36 and two outer leg portions 32, 34, and the two coils 14, 16 are magnetically coupled through the core 30. By integrating the coils 14 and 16 by magnetically coupling the coils 14 and 16, the number of components of the reactor 12 can be reduced, and the device including the converter can be downsized. The windings of the coils 14, 16 are wound in such a winding direction that the directions of the magnetic fluxes face each other in the outer leg portions 32, 34 of the core 30 when a direct current flows. The magnetic induction characteristics of the two inductors formed by the coils 14, 16 and the outer legs 32, 34 are made the same. Although not shown, in the case of a three-phase or higher multiphase converter as another embodiment, a core having the same number of outer leg portions as the number of phases can be used in the same manner.
[ Change of coil Current and magnetic flux ]
As shown in fig. 3, the switches 18 and 20 are normally controlled in accordance with a Pulse Width Modulation (PWM) signal generated by a control device (not shown). When the switch 18 of the first phase is switched on, the current I from the DC power supplyL1Into the windings of the coil 14. Due to the inductance L of the inductor formed by the coil 14 and the outer leg 321And follows the current I flowing in the winding of the coil 14L1Increase of the current IL1As the energy of the magnetic flux phio1Is accumulated in the outer leg portion 32 around which the coil 14 is wound. When the switch 18 is turned off, the energy accumulated in the coil 14 is discharged to the load side as a current. The same applies with respect to the second phase, due to the inductance L2And flows in the coil 16Dynamic current IL2The other outer leg 34 induces a magnetic flux Φo2. Since both the magnetic fluxes generated by the two coils 14, 16 pass in the central leg 36, the magnetic flux ΦcTo a value close to twice the respective magnetic flux. The magnetic flux Φ of the central leg 36 is shown in superimposed fashion in fig. 3 as a referencecA graph of half the value of (a). In addition, due to the magnetic flux Φ of the central leg portion 36cSince the two magnetic flux components shifted in phase by 180 degrees are superimposed, the frequency of the fluctuation is twice the switching frequency of the switches 18 and 20.
The current I flowing through the windings of the coils 14, 16L1、IL2A waveform containing an alternating current (fluctuating) component. Current IL1、IL2Is dependent on the connected load, but the inductance L of the coils 14, 161、L2The larger the fluctuation amplitude becomes. An output voltage V supplied to the load side according to the duty ratio of the PWM signaloLess than the input voltage V from the power supply sidei。
The converter 10 may also have capacitors 26 and 28 for smoothing on the input side and the output side, respectively. Although not shown, a current I flowing through the coils 14 and 16 for measuring each phase may be providedL1、IL2And a voltage sensor for detecting an input voltage and an output voltage of the converter 10, and controls the switching operation based on the measured values.
[ core Material ]
As shown in fig. 2, the core 30 is formed of a first core material and a second core material having frequency characteristics different from each other. Specifically, the outer peripheral portion 38 (i.e., the outer leg portions 32, 34 and the T-connection portion) of the core 30 other than the center leg portion 36 is formed of a first core material, and the center leg portion 36 is formed of a second core material whose magnetic permeability is less likely to decrease on the high-frequency side than that of the first core material, and in fig. 2, the first core material is drawn in white and the second core material is drawn in dark. For example, the first core material is an Mn-Zn-based ferrite material, and the second core material is an Ni-Zn-based ferrite material. When alternating magnetic fieldWhile the relative permeability of the Mn-Zn ferrite material decreases sharply when the frequency increases, the manner of decrease in the relative permeability of the Ni-Zn ferrite material on the high frequency side is relatively gradual. As previously described, due to the magnetic flux Φ of the center leg portion 36cSince the frequency of the fluctuation of (2) is twice the switching frequency, it is possible to suppress the deterioration of the performance of the center leg portion 36 as a core by forming only the center leg portion 36 of the core 30 from the Ni — Zn ferrite material. This effect is greater as the number of phases of the multiphase converter is greater. On the other hand, since the core loss per unit volume of the Ni — Zn ferrite material is about 20 times larger than that of the Mn — Zn ferrite material, it is not desirable to manufacture the core 30 entirely of the Ni — Zn ferrite material.
Although the present technology has been described above with reference to specific embodiments, the present technology is not limited to these embodiments, and those skilled in the art can implement various substitutions, improvements, and modifications without departing from the object of the present technology.
Claims (2)
1. A reactor is provided with:
a core having a central leg and at least two outer legs; and
a winding wound around each of the outer leg portions,
wherein an outer peripheral portion of the core other than the center leg portion is formed of a first core material,
the central leg portion is formed from a second core material,
the second core material is a material having frequency characteristics in which a decrease in magnetic permeability on the high-frequency side is more gradual than that of the first core material.
2. The reactor according to claim 1, wherein,
the first core material is a Mn-Zn ferrite material, and the second core material is a Ni-Zn ferrite material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020104499A JP7391776B2 (en) | 2020-06-17 | 2020-06-17 | reactor |
| JP2020-104499 | 2020-06-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113808818A true CN113808818A (en) | 2021-12-17 |
Family
ID=78892954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110503963.3A Pending CN113808818A (en) | 2020-06-17 | 2021-05-10 | Electric reactor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7391776B2 (en) |
| CN (1) | CN113808818A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1213596A (en) * | 1968-06-06 | 1970-11-25 | Welding Research Inc | Magnetically permeable core reactor |
| JP2011119477A (en) * | 2009-12-03 | 2011-06-16 | Fuji Electric Co Ltd | Reactor, and noise filter |
| CN202564007U (en) * | 2012-05-10 | 2012-11-28 | 苏州天铭磁业有限公司 | A ferrite core |
| CN102956344A (en) * | 2012-11-02 | 2013-03-06 | 华为技术有限公司 | Composite magnetic core structure and magnetic element |
| CN103413662A (en) * | 2013-09-01 | 2013-11-27 | 兰州交通大学 | Magnetic integration device of transformer type controllable electric reactor |
| JP2013247265A (en) * | 2012-05-28 | 2013-12-09 | Hitachi Metals Ltd | Reactor and power supply device |
| CN204102675U (en) * | 2014-08-04 | 2015-01-14 | 深圳市海光电子有限公司 | A kind of novel magnetic elements core structure |
| CN205282243U (en) * | 2016-01-13 | 2016-06-01 | 海宁凌通磁业科技有限公司 | Improve magnetic core |
| CN206379246U (en) * | 2017-01-18 | 2017-08-04 | 广州市通洋电子有限公司 | A kind of magnetic core of transformer easy to install |
| CN207883462U (en) * | 2018-01-09 | 2018-09-18 | 深圳市雅玛西电子有限公司 | Wideband combined co-mode inductance |
| CN110462767A (en) * | 2017-03-23 | 2019-11-15 | 松下知识产权经营株式会社 | Reactor and power circuit |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04254307A (en) * | 1991-02-06 | 1992-09-09 | Tokin Corp | Inductor for noise filter |
| JPH09289119A (en) * | 1996-04-19 | 1997-11-04 | Hitachi Ferrite Denshi Kk | Inductance element |
| JP3379419B2 (en) * | 1998-01-16 | 2003-02-24 | 松下電器産業株式会社 | Composite reactor, manufacturing method thereof and power supply device |
| JP2000150255A (en) * | 1998-11-12 | 2000-05-30 | Tokin Corp | Wound part |
| JP4453444B2 (en) * | 2004-05-28 | 2010-04-21 | 株式会社村田製作所 | Common mode choke coil |
| JP6124110B2 (en) * | 2012-10-10 | 2017-05-10 | 日立金属株式会社 | Composite reactor for multi-phase converter and multi-phase converter using the same |
| JP6953920B2 (en) * | 2017-09-05 | 2021-10-27 | 株式会社デンソー | Magnetic composite parts |
| JP2019201084A (en) * | 2018-05-15 | 2019-11-21 | 住友電気工業株式会社 | Coil part, circuit board, and power supply device |
-
2020
- 2020-06-17 JP JP2020104499A patent/JP7391776B2/en active Active
-
2021
- 2021-05-10 CN CN202110503963.3A patent/CN113808818A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1213596A (en) * | 1968-06-06 | 1970-11-25 | Welding Research Inc | Magnetically permeable core reactor |
| JP2011119477A (en) * | 2009-12-03 | 2011-06-16 | Fuji Electric Co Ltd | Reactor, and noise filter |
| CN202564007U (en) * | 2012-05-10 | 2012-11-28 | 苏州天铭磁业有限公司 | A ferrite core |
| JP2013247265A (en) * | 2012-05-28 | 2013-12-09 | Hitachi Metals Ltd | Reactor and power supply device |
| CN102956344A (en) * | 2012-11-02 | 2013-03-06 | 华为技术有限公司 | Composite magnetic core structure and magnetic element |
| CN103413662A (en) * | 2013-09-01 | 2013-11-27 | 兰州交通大学 | Magnetic integration device of transformer type controllable electric reactor |
| CN204102675U (en) * | 2014-08-04 | 2015-01-14 | 深圳市海光电子有限公司 | A kind of novel magnetic elements core structure |
| CN205282243U (en) * | 2016-01-13 | 2016-06-01 | 海宁凌通磁业科技有限公司 | Improve magnetic core |
| CN206379246U (en) * | 2017-01-18 | 2017-08-04 | 广州市通洋电子有限公司 | A kind of magnetic core of transformer easy to install |
| CN110462767A (en) * | 2017-03-23 | 2019-11-15 | 松下知识产权经营株式会社 | Reactor and power circuit |
| CN207883462U (en) * | 2018-01-09 | 2018-09-18 | 深圳市雅玛西电子有限公司 | Wideband combined co-mode inductance |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7391776B2 (en) | 2023-12-05 |
| JP2021197504A (en) | 2021-12-27 |
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