Noise mitigation in wireless power systems
AssigneeApple Inc.
InventorsKaran S. Jain, Supratik Datta, Nandita Venugopal, Asif Hussain
Life of this patent
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Abstract
A wireless power system includes an electrically-balanced inductor in a transmitter device and an electrically-balanced inductor in a receiver device. The electrically-balanced inductors can be formed by introducing crossovers between radially-adjacent portions of two separate turns of each inductor. The crossovers balance the electric field generated by the transmitter device when transferring power to the receiver device.
Claims17
A wireless power system comprising:
- a transmitter comprising:
- a substrate;
- at least one transmitter coil on the substrate formed with at least one crossover per turn, the at least one transmitter coil comprising;
- a first portion;
- a second portion;
- and
- an in-line filter capacitor coupled between the first portion and the second portion, wherein at least one crossover is formed by the in-line filter capacitor;
- and
- a receiver magnetically coupled to the at least one transmitter coil and comprising a receiver coil formed with at least one crossover per turn.
A method of forming an inductor array for a wireless power system, the method comprising:
- selecting a turn layer comprising a number of turn trace pairs, each turn trace pair comprising:
- a first turn trace;
- and
- a second turn trace;
- positioning a crossover layer on the turn layer, the crossover layer comprising a number of crossover traces, each crossover trace positioned over a respective one first turn trace and over a respective one second turn trace;
- and
- electrically connecting the crossover layer to the turn layer to define at least one inductor the at least one inductor comprising at least one crossover per turn;
- wherein at least one crossover is formed by an in-line capacitor.
A method of forming an inductor for a wireless power system, the method comprising:
- forming a turn layer comprising:
- a first turn trace;
- a second turn trace adjacent to the first turn trace;
- a third turn trace opposite the first turn trace;
- a fourth turn trace adjacent to the third turn trace and opposite the third turn trace;
- forming a first crossover by electrically connecting an in-line capacitor between the first turn trace and the fourth turn trace;
- depositing an insulating material over the crossover;
- and
- forming a second crossover electrically connecting the second turn trace and the third turn trace.
Dependencies are inferred from the claim text.