Wireless energy transfer for mobile device applications
First Claim
1. A wireless power source comprising:
- a printed circuit board, wherein the printed circuit board includes at least a first layer, a second layer, and a third layer;
a current sensor created on the printed circuit board, the current sensor comprisinga loop of conductive material, wherein the loop of conductive material includes a diameter D3 on the second layer, anda coil of conductive material, wherein the coil of conductive material has at least two turns, wherein the coil of conductive material occupies the first layer and the third layer with an outer diameter D1 and an inner diameter D2, connected through each of the first, second, and third layers, such that the at least two turns of the coil of conductive material wrap around the loop of conductive material, and wherein the loop of conductive material is coupled to the coil of conductive material;
a conductor routed through the inner diameter D2 of the coil of conductive material; and
circuitry coupled with the current sensor, the circuitry being configured to use the current sensor to measure one or more values of current flowing through the conductor;
wherein the circuitry comprises circuitry configured to remove harmonic content from a signal received from the current sensor, a differential amplifier with a voltage output, and peak detector circuitry including an operational amplifier to track a peak of the voltage output and determine a measured current value of the conductor.
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Accused Products
Abstract
A current sensing system and method for wireless energy transfer may include a printed circuit board, wherein the printed circuit board may include at least a first layer, a second layer, and a third layer. A loop of conductive material may be included, wherein the loop of conductive material may include a diameter D3 on the second layer. A coil of conductive material may be included, wherein the coil of conductive material may have at least 2 turns, wherein a majority of the coil of conductive material may occupy the first layer and the third layer with an outer diameter D1 and an inner diameter D2, connected through each of the first, second, and third layers. The loop of conductive material may be coupled to the coil of conductive material.
186 Citations
21 Claims
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1. A wireless power source comprising:
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a printed circuit board, wherein the printed circuit board includes at least a first layer, a second layer, and a third layer; a current sensor created on the printed circuit board, the current sensor comprising a loop of conductive material, wherein the loop of conductive material includes a diameter D3 on the second layer, and a coil of conductive material, wherein the coil of conductive material has at least two turns, wherein the coil of conductive material occupies the first layer and the third layer with an outer diameter D1 and an inner diameter D2, connected through each of the first, second, and third layers, such that the at least two turns of the coil of conductive material wrap around the loop of conductive material, and wherein the loop of conductive material is coupled to the coil of conductive material; a conductor routed through the inner diameter D2 of the coil of conductive material; and circuitry coupled with the current sensor, the circuitry being configured to use the current sensor to measure one or more values of current flowing through the conductor; wherein the circuitry comprises circuitry configured to remove harmonic content from a signal received from the current sensor, a differential amplifier with a voltage output, and peak detector circuitry including an operational amplifier to track a peak of the voltage output and determine a measured current value of the conductor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless power source comprising:
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a printed circuit board comprising three or more layers, including a first layer, a second layer, and a third layer; a Rogowski coil that occupies each of the first layer, the second layer, and the third layer of the printed circuit board, wherein the Rogowski coil comprises at least one conductive trace on or within each of the first layer, the second layer, and the third layer of the printed circuit board; a source resonator coil that occupies at least one of the three or more layers of the printed circuit board, wherein the source resonator coil comprises or is electrically coupled with a conductor routed through the Rogowski coil; and circuitry coupled with the Rogowski coil, the circuitry being configured to use the Rogowski coil to measure one or more values corresponding to current flowing through the conductor routed through the Rogowski coil. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A current sensor for wireless power transfer systems, the current sensor comprising:
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a printed circuit board comprising a first layer, a second layer, a third layer, and a fourth layer; and a Rogowski coil that occupies each of the first layer, the second layer, the third layer, and the fourth layer of the printed circuit board; wherein the Rogowski coil comprises multiple conductive traces on each of the first layer and the fourth layer of the printed circuit board, vias that pass through the second layer and the third layer and electrically couple the multiple conductive traces of the first layer with the multiple conductive traces of the fourth layer, and at least one conductive trace on or within each of the second layer and the third layer of the printed circuit board, wherein the multiple conductive traces and the vias are, together, effectively toroidal in shape, and the effectively toroidal shape of the multiple conductive traces and the vias wrap around both the at least one conductive trace on or within the second layer and the at least one conductive trace on or within the third layer. - View Dependent Claims (18, 19, 20, 21)
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Specification