Magnetic device with high saturation current and low core loss
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01F-027/02
H01F-027/28
H01F-027/24
H01F-017/04
출원번호
US-0738674
(2013-01-10)
등록번호
US-8723629
(2014-05-13)
발명자
/ 주소
Liu, Chun-Tiao
Hsieh, Lan-Chin
Wu, Tsung-Chan
Lee, Chi-Hsun
Chuang, Chih-Siang
출원인 / 주소
Cyntec Co., Ltd.
대리인 / 주소
Birch, Stewart, Kolasch & Birch LLP
인용정보
피인용 횟수 :
6인용 특허 :
2
초록▼
A magnetic device includes a T-shaped magnetic core, a wire coil and a magnetic body. The T-shaped magnetic core includes a base and a pillar, and is made of an annealed soft magnetic metal material, a core loss PCL (mW/cm3) of the T-shaped magnetic core satisfying: 0.64×f0.95×Bm2.20≦PCL≦7.26×f1.41×
A magnetic device includes a T-shaped magnetic core, a wire coil and a magnetic body. The T-shaped magnetic core includes a base and a pillar, and is made of an annealed soft magnetic metal material, a core loss PCL (mW/cm3) of the T-shaped magnetic core satisfying: 0.64×f0.95×Bm2.20≦PCL≦7.26×f1.41×Bm1.08, where f (kHz) represents a frequency of a magnetic field applied to the T-shaped magnetic core, and Bm (kGauss) represents the operating magnetic flux density of the magnetic field at the frequency. The magnetic body fully covers the pillar, any part of the base that is located above the bottom surface of the base, and any part of the wire coil that is located directly above the top surface of the base.
대표청구항▼
1. A magnetic device comprising: a T-shaped magnetic core including a base and a pillar, the base having a first surface and a second surface opposite to the first surface, the pillar being located on the first surface of the base, the second surface of the base being exposed to outer environment as
1. A magnetic device comprising: a T-shaped magnetic core including a base and a pillar, the base having a first surface and a second surface opposite to the first surface, the pillar being located on the first surface of the base, the second surface of the base being exposed to outer environment as an outer surface of the magnetic device, the T-shaped magnetic core being made of an annealed soft magnetic metal material, a core loss PCL (mW/cm3) of the T-shaped magnetic core satisfying: 0.64×f0.95×B2.20≦PCL≦7.26×f1.41×Bm1.08,where f (kHz) represents a frequency of a magnetic field applied to the T-shaped magnetic core, and Bm (kGauss) represents the operating magnetic flux density of the magnetic field at the frequency;a wire coil surrounding the pillar, the wire coil having two leads; anda magnetic body fully covering the pillar, any part of the base that is located above the second surface of the base, and any part of the wire coil that is located directly above the first surface of the base,wherein a permeability of the magnetic body is μB, and wherein μB≧4.8, and the core loss PBL (mW/cm3) of the magnetic body satisfies: 2×f1.29×Bm2.2≦PBL≦14.03×f1.29×Bm1.08. 2. The magnetic device of claim 1, wherein the two leads of the wire coil are respectively connected to two electrodes on the base. 3. The magnetic device of claim 1, wherein the magnetic body fully covers any part of the wire coil that is located above the first surface of the base. 4. The magnetic device of claim 1, wherein a volume V1 of the base and a volume V2 of the pillar satisfies: V1/V2≦2.533. 5. The magnetic device of claim 4, wherein the volume V1 of the base and the volume V2 of the pillar satisfies: V1/V2≦2.093. 6. The magnetic device of claim 1, wherein the two electrodes are embedded in the base. 7. The magnetic device of claim 6, wherein a bottom surface of each of the two electrodes is substantially coplanar with the second surface of the base, and a lateral surface of each of the two electrodes is substantially coplanar with a corresponding one of two opposite lateral surfaces of the base. 8. The magnetic device of claim 1, wherein the base has two recesses respectively located on two lateral sides of the base, the two recesses respectively receiving the two leads so that the two leads are respectively in contact with the two electrodes via the two recesses. 9. The magnetic device of claim 1, wherein the base is a rectangular base with right-angled corners or curved corners, and a shortest distance from each of the four ends of the rectangular base to the pillar is substantially the same. 10. The magnetic device of claim 1, wherein a permeability of the T-shaped magnetic core is μC, and wherein μC≧48 and the core loss PCL (mW/cm3) of the T-shaped magnetic core further satisfies: 0.64×f1.15×Bm2.20≦PCL≦4.79×f1.41×Bm1.08. 11. The magnetic device of claim 10, wherein the annealed soft magnetic metal material is selected from the group consisting of Fe—Si alloy powder that has been pressed into a T-shaped structure and annealed to have the permeability between 48 and 108, Fe—Si—Al alloy powder that has been pressed into the T-shaped structure and annealed to have the permeability between 48 and 150, Fe—Ni alloy powder that has been pressed into the T-shaped structure and annealed to have the permeability between 48 and 192, Fe—Ni—Mo alloy powder that has been pressed into the T-shaped structure and annealed to have the permeability between 48 and 240, and a combination of two or more thereof. 12. The magnetic device of claim 10, wherein the annealed soft magnetic metal material is selected from the group consisting of Fe—Si—Al alloy powder that has been pressed into the T-shaped structure and annealed to have the permeability between 48 and 150, Fe—Ni alloy powder that has been pressed into the T-shaped structure and annealed to have the permeability between 48 and 192, Fe—Ni—Mo alloy powder that has been pressed into the T-shaped structure and annealed to have the permeability between 48 and 240, and a combination of two or more thereof, and the core loss PCL, (mW/cm3) of the T-shaped magnetic core further satisfies: 0.64×f1.31×Bm2.20≦PCL≦2.0×f1.41×Bm1.08. 13. The magnetic device of claim 10, wherein μC×Hsat≧2250, where Hsat (Oe) is a strength of the magnetic field at 80% of μC0, where μC0 is the permeability of the T-shaped magnetic core when the strength of the magnetic field is 0. 14. The magnetic device of claim 1, wherein an equivalent permeability of the magnetic device is between 28.511 and 52.949. 15. The magnetic device of claim 1, wherein the magnetic body is made of a hot-pressed mixture of resin and a material selected from the group consisting of iron-based amorphous powder, Fe—Si—Al alloy powder, permalloy powder, ferro-Si alloy powder, nano crystalline alloy powder, and a combination of two or more thereof. 16. The magnetic device of claim 1, wherein the permeability μB of the magnetic body satisfies: 9.85≦μB≦64.74, and the core loss PBL (mW/cm3) of the magnetic body further satisfies: 2×f1.29×Bm2.2≦PBL≦11.23×f1.29×Bm1.08. 17. The magnetic device of claim 16, wherein the permeability μB of the magnetic body satisfies: 20≦μB≦40, and the core loss PBL (mW/cm3) of the magnetic body further satisfies: 2×f1.29×Bm2.2≦PBL≦3.74×f1.29×Bm1.08. 18. The magnetic device of claim 1, wherein μB×Hsat≧2250, where Hsat (Oe) is a strength of the magnetic field at 80% of μB0, where μB0 is the permeability of the magnetic body when the strength of the magnetic field is 0. 19. A magnetic device comprising: a T-shaped magnetic core including a base and a pillar, the base having a first surface and a second surface opposite to the first surface, the pillar being located on the first surface of the base, the second surface of the base being exposed to outer environment as an outer surface of the magnetic device, the T-shaped magnetic core being made of an annealed soft magnetic metal material, a core loss PCL (mW/cm3) of the T-shaped magnetic core satisfying: 0.64×f0.95×Bm2.20≦PCL≦7.26×f1.41×Bm1.08,where f (kHz) represents a frequency of a magnetic field applied to the T-shaped magnetic core, and Bm (kGauss) represents the operating magnetic flux density of the magnetic field at the frequency;a wire coil surrounding the pillar, the wire coil having two leads; anda magnetic body fully covering the pillar, any part of the base that is located above the second surface of the base, and any part of the wire coil that is located directly above the first surface of the base,wherein a permeability of the T-shaped magnetic core is μC and a permeability of the magnetic body is μB, and 48≦μC≦240,9.85≦μB≦64.74,wherein μC corresponds to a range of μB between an upper limit and a lower limit of μB, and the higher μC is, the smaller the range of μB is, and the lower the upper limit and the lower limit of μB are.
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이 특허에 인용된 특허 (2)
Rapoport, William R.; Papanestor, Paul A.; Grimes, Donald Allen; VanBuskirk, Bruce; Fish, Gordon E., High pulse rate ignition system.
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