Impedance matching multiple coils in an electronic device

An apparatus comprising:

• a power supply;
• a wireless transmitter or receiver coupled to the power supply, the wireless transmitter or receiver comprising a first terminal and a second terminal;
• a first coil comprising a first impedance;
• a second coil comprising a second impedance;
• a controller to process control signals;
• and
• an impedance matching circuit coupled to the first terminal and the second terminal, wherein the impedance matching circuit comprises:
• a first conductive path comprising a third impedance to match the first impedance;
• a second conductive path comprising a fourth impedance to match the second impedance;
• first switching circuitry coupled to the first coil and the first conductive path, wherein the first switching circuitry, in response to a first control signal from the controller, is to switch either the first coil or the first conductive path in series between the first terminal and the second terminal;
• and
• second switching circuitry coupled to the second coil and the second conductive path, wherein the second switching circuitry, in response to a second control signal from the controller, is to switch either the second coil or the second conductive path in series between the first terminal and the second terminal.

An electronic device comprising:

• a power supply;
• a wireless power transmitter coupled to the power supply, the wireless power transmitter comprising a first terminal and a second terminal;
• and
• a plurality of power transfer circuits, wherein a first power transfer circuit comprises a first transmitter coil and a first bypass signaling path, wherein the first bypass signaling path comprises a first impedance to match a second impedance of the first transmitter coil, wherein a second power transfer circuit comprises a second transmitter coil and a second bypass signaling path, wherein the second bypass signaling path comprises a third impedance to match a fourth impedance of the second transmitter coil, and wherein the plurality of power transfer circuits are coupled in series between the first terminal and the second terminal.

A method for impedance matching multiple transceiver coils used in power management of a mobile device, the method comprising:

• coupling a first transceiver coil having a first impedance and a second transceiver coil having a second impedance to a power supply;
• coupling an impedance matching circuitry to output terminals of the first transceiver coil using a first switching circuitry and a first conductive path having a third impedance to match the first impedance;
• coupling the impedance matching circuitry to output terminals of the second transceiver coil using a second switching circuitry and a second conductive path having a fourth impedance to match the second impedance;
• in response to a first power management control signal, adjusting the first switching circuitry to switch either the first transceiver coil or the first conductive path in series between the output terminals so that the first transceiver coil and the first conductive path have the same impedance;
• and
• in response to a second power management control signal, adjusting the second switching circuitry to switch either the second transceiver coil or the second conductive path in series between the output terminals so that the second transceiver coil and the second conductive path have the same impedance.