Charging unit for a contactless transfer of electric power as well as a power absorbing device and a charging system
First Claim
1. A charging system used for a contactless transfer of electric power from a charging unit to a mobile unit, said the charging unit transferring by means of an alternating magnetic field electric power from at least one primary winding (120) arranged in said charging unit to at least one secondary winding (122) arranged in said mobile unit, the charging system comprising:
- a first substantially U-shaped ferrite core arranged in said charging unit, the first ferrite core comprising a first base having a first base length, a first leg having a first leg length, a second leg having a second leg length, a first pole face positioned at an end of the first leg, and a second pole face positioned at an end of the second leg, a second substantially U-shaped ferrite core arranged in said mobile unit, the second ferrite core comprising a second base having a second base length, a third leg having a third leg length, a fourth leg having a fourth leg length, a third pole face positioned at an end of the third leg, and a fourth pole face positioned at an end of the fourth leg, and wherein the first base length is greater than the second base length, the first leg length and second leg length are greater than the third leg length and fourth leg length, and the first pole face and the second pole face are larger than the third pole face and the fourth pole face.
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Accused Products
Abstract
A charging system is used for contactless transfer of electric power from a charging unit to a mobile unit. The system includes a first substantially U-shaped ferrite core which is operable to be located within the charging unit. The first core includes a base area and two leg areas. Each leg area of the first core includes a pole face. A first winding is arranged on the base area of the first ferrite core. The system also includes a second substantially U-shaped ferrite core which is operable to be located within a mobile unit. The second core includes a base area and two leg areas. Each leg area of the second core includes a pole face. A second winding is arranged on the base area of the second ferrite core. The first ferrite core has larger cross-sectional dimensions than the second ferrite core.
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Citations
19 Claims
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1. A charging system used for a contactless transfer of electric power from a charging unit to a mobile unit, said the charging unit transferring by means of an alternating magnetic field electric power from at least one primary winding (120) arranged in said charging unit to at least one secondary winding (122) arranged in said mobile unit, the charging system comprising:
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a first substantially U-shaped ferrite core arranged in said charging unit, the first ferrite core comprising a first base having a first base length, a first leg having a first leg length, a second leg having a second leg length, a first pole face positioned at an end of the first leg, and a second pole face positioned at an end of the second leg, a second substantially U-shaped ferrite core arranged in said mobile unit, the second ferrite core comprising a second base having a second base length, a third leg having a third leg length, a fourth leg having a fourth leg length, a third pole face positioned at an end of the third leg, and a fourth pole face positioned at an end of the fourth leg, and wherein the first base length is greater than the second base length, the first leg length and second leg length are greater than the third leg length and fourth leg length, and the first pole face and the second pole face are larger than the third pole face and the fourth pole face. - View Dependent Claims (2, 3, 17)
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4. A charging system used for a contactless transfer of electric power from a charging unit to a mobile unit, the charging system comprising:
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a first substantially U-shaped ferrite core operable to be located within the charging unit, the first ferrite core including a base, two legs, a pole face located on each leg, and a first winding;
a second substantially U-shaped ferrite core operable to be located within the mobile unit, the second ferrite core including a base, two legs, a pole face located on each leg, and a second winding; and
wherein the first ferrite core has larger cross-sectional dimensions than the second ferrite core. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of transferring electric power from a primary winding to a secondary winding, the method comprising:
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arranging the primary winding on a base of a first U-shaped ferrite core having a first leg and a second leg, wherein the base of the first ferrite core is longer than both the first leg and the second leg of the first ferrite core; and
arranging the second winding on a base of a second U-shaped ferrite core having a third leg and a fourth leg, wherein the base of the second ferrite core is longer than both the third leg and the fourth leg of the second ferrite core, and wherein the base of the first core is larger than the base of the second core. - View Dependent Claims (15, 16)
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18. A charging system used for a contactless transfer of electric power from a charging unit to a mobile unit, the charging system comprising:
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a first substantially U-shaped ferrite core arranged in said charging unit, the first ferrite core comprising a first base having a first base length, a first winding arranged on the first base, a first leg having a first leg length, a second leg having a second leg length, a first pole face positioned at an end of the first leg, and a second pole face positioned at an end of the second leg, a second substantially U-shaped ferrite core arranged in said mobile unit, the second ferrite core comprising a second base having a second base length, a second winding arranged on the second base, a third leg having a third leg length, a fourth leg having a fourth leg length, a third pole face positioned at an end of the third leg, and a fourth pole face positioned at an end of the fourth leg, and wherein the first base length is greater than the second base length, the first leg length and second leg length are greater than the third leg length and fourth leg length, and the first pole face and the second pole face are larger than the third pole face and the fourth pole face; and
wherein the first base length is greater than the first leg length and the second leg length, and the second base length is greater than the third leg length and the fourth leg length.
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19. A charging system used for a contactless transfer of electric power from a charging unit to a mobile unit, the charging system comprising:
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a first substantially U-shaped ferrite core arranged in the charging unit, the first ferrite core comprising a first base, a first winding arranged on the first base, a first leg, and a first pole face positioned at an end of the first leg, a second substantially U-shaped ferrite core arranged in the mobile unit, the second ferrite core comprising a second base, a second winding arranged on the second base, a second leg, and a second pole face positioned at an end of the second leg, and wherein the second pole face does not completely overlap the first pole face when the charging system transfers electric power between the charging unit and the mobile unit.
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Specification