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1. (WO2018044515) RECTIFIER ARBITRATION IN WIRELESS CHARGING SYSTEMS
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Claims

What is Claimed is:

1. An electronic device configured to receive wireless power from a power transmitting device, comprising:

first and second coils configured to receive alternating-current magnetic signals transmitted from the power transmitting device and configured to produce corresponding alternating-current voltages;

a first rectifier coupled to the first coil, wherein the first rectifier has transistors configured to rectify the alternating-current voltages and produce a corresponding rectified direct-current voltage when the first rectifier is enabled;

a second rectifier coupled to the second coil, wherein the second rectifier has transistors configured to rectify the alternating-current voltages and produce a corresponding rectified direct-current voltage when the second rectifier is enabled; and

control circuitry coupled to the first coil and the second coil, the control circuitry configured to enable at least one of the first rectifier and the second rectifier based on the alternating-current voltages produced by the first and second coils.

2. The electronic device defined in claim 1, further comprising a first comparator, wherein the first comparator has first and second inputs and wherein a first node between the first coil and the first rectifier is coupled to the first input of the comparator.

3. The electronic device defined in claim 2, wherein a second node between the second coil and the second rectifier is coupled to the second input of the comparator.

4. The electronic device defined in claim 3, further comprising a first resistor coupled between the first node and the first input of the comparator, wherein the first resistor is coupled to a third node that is interposed between the first node and the first input and wherein a first capacitor is coupled between the third node and ground.

5. The electronic device defined in claim 4, further comprising a second resistor coupled between the second node and the second input of the comparator, wherein

the second resistor is coupled to a fourth node that is interposed between the second node and the second input and wherein a second capacitor is coupled between the fourth node and ground.

6. The electronic device defined in claim 1, wherein the first rectifier and the second rectifier are both coupled to a common rectifier output node.

7. The electronic device defined in claim 6, further comprising a first comparator that has first and second inputs, wherein the common rectifier output node is coupled to the first input of the first comparator and wherein a first threshold voltage is provided to the second input of the first comparator.

8. The electronic device defined in claim 7, further comprising a second comparator that has first and second inputs, wherein the common rectifier output node is coupled to the first input of the second comparator and wherein a second threshold voltage is provided to the second input of the second comparator.

9. The electronic device defined in claim 1, wherein the first rectifier has an output that is coupled to a common rectifier output node and wherein the second rectifier has an output that is coupled to the common rectifier output node, the electronic device further comprising a first sensing resistor coupled between the output of the first rectifier and the common rectifier node and a first voltage meter that measures a voltage drop across the first sensing resistor in order to measure an output current of the first rectifier.

10. The electronic device defined in claim 9, further comprising a second sensing resistor coupled between the output of the second rectifier and the common rectifier output node and a second voltage meter that measures a voltage drop across the second sensing resistor in order to measure an output current of the second rectifier.

11. The electronic device defined in claim 9, further comprising a second sensing resistor coupled to the common rectifier output node and a second voltage meter that measures a voltage drop across the second sensing resistor in order to measure a combined

output current of the first and second rectifiers.

12. An electronic device configured to receive wireless power from a power transmitting device, comprising:

first and second coils configured to receive alternating-current magnetic signals transmitted from the power transmitting device and configured to produce corresponding alternating-current voltages;

a first rectifier coupled to the first coil, wherein the first rectifier is configured to rectify the alternating-current voltages and produce a corresponding rectified direct-current voltage when the first rectifier is enabled;

a second rectifier coupled to the second coil, wherein the second rectifier is configured to rectify the alternating-current voltages and produce a corresponding rectified direct-current voltage when the second rectifier is enabled; and

control circuitry coupled to the first coil and the second coil, the control circuitry configured to measure a first output current from the first rectifier and a second output current from the second rectifier, enable the first rectifier if the first output current is above a first threshold, and enable the second rectifier if the second output current is above a second threshold.

13. The electronic device defined in claim 12, the control circuitry comprising at least first and second sensing resistors, wherein the at least first and second sensing resistors have corresponding voltage meters to measure voltage drop across the resistors.

14. The electronic device defined in claim 12, wherein the first rectifier has an output that is coupled to a common rectifier output node and wherein the second rectifier has an output that is coupled to the common rectifier output node, the control circuitry comprising a first sensing resistor coupled between the output of the first rectifier and the common rectifier node and a first voltage meter that measures a voltage drop across the first sensing resistor to measure the first output current.

15. The electronic device defined in claim 14, wherein the control circuitry

further comprises a second sensing resistor coupled between the output of the second rectifier and the common rectifier output node and a second voltage meter that measures a voltage drop across the second sensing resistor in order to measure to second output current.

16. The electronic device defined in claim 14, further comprising a second sensing resistor coupled to the common rectifier output node and a second voltage meter that measures a voltage drop across the second sensing resistor in order to measure a combined output current of the first and second rectifiers.

17. An electronic device that receives alternating-current wireless power signals transmitted by a wireless power device, the electronic device comprising:

a first rectifier;

a first power receiving coil coupled to the first rectifier, wherein the first power receiving coil is configured to produce a first alternating-current voltage based on the received alternating-current wireless power signals and wherein the first alternating-current voltage is characterized by a first magnitude;

a second rectifier;

a second power receiving coil coupled to the second rectifier, wherein the second power receiving coil is configured to produce a second alternating-current voltage based on the received alternating-current wireless power signals and wherein the second alternating-current voltage is characterized by a second magnitude; and

control circuitry configured to enable one of the first and second rectifiers based on the first and second magnitudes.

18. The electronic device defined in claim 17, wherein the first and second rectifiers are coupled at a common rectifier output node, wherein the common rectifier output node has a voltage, and wherein the control circuitry is configured to enable the first rectifier if the voltage of the common rectifier output node is greater than a first rectifier threshold voltage and the first magnitude is greater than the second magnitude.

19. The electronic device defined in claim 18, wherein the control circuitry is configured to enable the second rectifier if the voltage of the common rectifier output node is greater than a second rectifier threshold voltage and the second magnitude is greater than the first magnitude.

20. The electronic device defined in claim 19, wherein the control circuitry is configured to enable the second rectifier in a half-bridge mode if the voltage of the common rectifier output node is less than the second rectifier threshold voltage and the second magnitude is greater than the first magnitude.