Electromagnetic Interference Shield for Wireless Power Transfer
First Claim
1. A wireless power transmitter comprising:
- an alternating current source;
a transmitter coil configured to receive an alternating current from the alternating current source; and
a shield coil located substantially directly above the transmitter coil, one end of the shield coil being coupled to ground.
1 Assignment
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Accused Products
Abstract
In one embodiment, a wireless power transmitter includes an alternating current source, a transmitter coil configured to receive an alternating current from the alternating current source, and a shield coil located substantially directly above the transmitter coil, one end of the shield coil being coupled to ground. The shield coil acts as an EMI shield to ground high-frequency noise generated by the transmitter coil. The wireless power transmitter may also include a capacitor coupled between a second end of the shield coil and ground. In another embodiment, a wireless power transmitter includes a plurality of transmitter coils and a plurality of shield coils, each of the plurality of shield coils located substantially directly above one of the plurality of transmitter coils, the plurality of shield coils being coupled together in series between ground and a first end of a capacitor, the capacitor having a second end coupled to ground.
28 Citations
20 Claims
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1. A wireless power transmitter comprising:
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an alternating current source; a transmitter coil configured to receive an alternating current from the alternating current source; and a shield coil located substantially directly above the transmitter coil, one end of the shield coil being coupled to ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless power transmitter comprising:
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a transmitter coil configured to emit magnetic flux when an alternating current flows through the transmitter coil; a shield coil located substantially directly above the transmitter coil, one end of the shield coil being coupled to ground; and a capacitor coupled between a second end of the shield coil and ground. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A wireless power transmitter comprising:
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an alternating current source; a plurality of transmitter coils configured to receive an alternating current from the alternating current source, the plurality of transmitter coils coupled together in series; and a plurality of shield coils, each of the plurality of shield coils located substantially directly above one of the plurality of transmitter coils, the plurality of shield coils being coupled together in series between ground and a first end of a capacitor, the capacitor having a second end coupled to ground. - View Dependent Claims (17, 18, 19, 20)
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Specification