Wireless charger with uniform H-field generator and EMI reduction
First Claim
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1. A wireless charger comprising:
- at least four conductive coils arranged in a two-by-two array, each conductive coil in the two-by-two array arranged to have a first adjacent conductive coil and a second adjacent conductive coil, and when a particular conductive coil comprises a first current in a first direction around the particular conductive coil, a second current in the first adjacent conductive coil is in direction than the first direction around the first adjacent conductive coil and a third current in the second adjacent conductive coil is in the opposite direction than the first direction around the second adjacent conductive coil, wherein the at least four conductive coils are formed using a single conductor and include;
a first outer loop and a first inner loop, a first portion of the first outer loop comprising a first terminal, the first inner loop comprising a first crosspoint;
a second outer loop and a second inner loop non-adjacent to the first outer loop and the first inner loop, the second outer loop coupled to the first crosspoint of the first inner loop, the second inner loop comprising a second crosspoint;
a third outer loop and a third inner loop, the third outer loop coupled to the second crosspoint of the second inner loop, the third inner loop comprising a third crosspoint; and
a fourth outer loop and a fourth inner loop, the fourth outer loop coupled to the third crosspoint, the fourth inner loop comprising a fourth crosspoint, wherein a second portion of the first outer loop is coupled to the fourth crosspoint and the second portion of the first outer loop comprises a second terminal, and wherein current flows between the first terminal and the second terminal.
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Abstract
The present disclosure pertains to wireless chargers. In one embodiment, a 2×2 array of conductive coils produces magnetic fields. Adjacent coils receive current having different directions to cancel magnetic fields around a periphery of the array. A wireless charging platform may include at least four such coils. Regions between and above the coils may include magnetic fields approximately parallel to the surface of the platform so that electronic devices may be charged while standing up during operation by a user with reduced exposure to magnetic radiation. An electronic device may also be placed flat on each coil for charging.
17 Citations
18 Claims
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1. A wireless charger comprising:
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at least four conductive coils arranged in a two-by-two array, each conductive coil in the two-by-two array arranged to have a first adjacent conductive coil and a second adjacent conductive coil, and when a particular conductive coil comprises a first current in a first direction around the particular conductive coil, a second current in the first adjacent conductive coil is in direction than the first direction around the first adjacent conductive coil and a third current in the second adjacent conductive coil is in the opposite direction than the first direction around the second adjacent conductive coil, wherein the at least four conductive coils are formed using a single conductor and include; a first outer loop and a first inner loop, a first portion of the first outer loop comprising a first terminal, the first inner loop comprising a first crosspoint; a second outer loop and a second inner loop non-adjacent to the first outer loop and the first inner loop, the second outer loop coupled to the first crosspoint of the first inner loop, the second inner loop comprising a second crosspoint; a third outer loop and a third inner loop, the third outer loop coupled to the second crosspoint of the second inner loop, the third inner loop comprising a third crosspoint; and a fourth outer loop and a fourth inner loop, the fourth outer loop coupled to the third crosspoint, the fourth inner loop comprising a fourth crosspoint, wherein a second portion of the first outer loop is coupled to the fourth crosspoint and the second portion of the first outer loop comprises a second terminal, and wherein current flows between the first terminal and the second terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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receiving a first current in a first conductive coil to produce a first magnetic field; receiving a second current in a second conductive coil to produce a second magnetic field; receiving a third current in a third conductive coil to produce a third magnetic field; and receiving a fourth current in a fourth conductive coil to produce a fourth magnetic field; wherein the first conductive coil, the second conductive coil, the third conductive coil, and the fourth conductive coil are formed using a single conductor including; a first outer loop and a first inner loop, a first portion of the first outer loop comprising a first terminal, the first inner loop comprising a first crosspoint; a second outer loop and a second inner loop non-adjacent to the first outer loop and the first inner loop, the second outer loop coupled to the first crosspoint of the first inner loop, the second inner loop comprising a second crosspoint; a third outer loop and a third inner loop, the third outer loop coupled to the second crosspoint of the second inner loop, the third inner loop comprising a third crosspoint; and a fourth outer loop and a fourth inner loop, the fourth outer loop coupled to the third crosspoint, the fourth inner loop comprising a fourth crosspoint, wherein a second portion of the first outer loop is coupled to the fourth crosspoint and the second portion of the first outer loop comprises a second terminal, and wherein current flows between the first terminal and the second terminal. - View Dependent Claims (17)
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18. A wireless charger comprising:
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first means for producing a first magnetic field based on a first current; second means for producing a second magnetic field based on a second current; third means for producing a third magnetic field based on a third current; and fourth means for producing a fourth magnetic field based on a fourth current; wherein the first means, the second means, the third means, and the fourth means are formed using a single conductor means including; a first outer loop and a first inner loop, a first portion of the first outer loop comprising a first terminal, the first inner loop comprising a first crosspoint; a second outer loop and a second inner loop non-adjacent to the first outer loop and the first inner loop, the second outer loop coupled to the first crosspoint of the first inner loop, the second inner loop comprising a second crosspoint; a third outer loop and a third inner loop, the third outer loop coupled to the second crosspoint of the second inner loop, the third inner loop comprising a third crosspoint; and a fourth outer loop and a fourth inner loop, the fourth outer loop coupled to the third crosspoint, the fourth inner loop comprising a fourth crosspoint, wherein a second portion of the first outer loop is coupled to the fourth crosspoint and the second portion of the first outer loop comprises a second terminal, and wherein current flows between the first terminal and the second terminal.
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Specification