Systems for battery charging using a wireless charging signal

1. A system for charging a battery, comprising:

a regulator having an output coupled to the battery and having an input;

a wireless charging receiver having an output coupled to the input of the regulator and having an input that receives a power signal from a wireless charging transmitter;

a controller having a first input coupled to the input of the regulator, having a second input coupled to the output of the regulator, and having a first output coupled to the wireless charging transmitter, wherein the controller is configured to send, using the first output of the controller, a control signal that is determined based upon a ratio of a first measured voltage at the first input and a second measured voltage at the second input to the wireless charging transmitter that causes the wireless charging transmitter to change the power signal provided to the wireless charging receiver.

2. The system of claim 1 , wherein the control signal causes the wireless charging transmitter to change at least one of an amplitude and a frequency of an AC voltage on an inductor of the wireless charging transmitter that is inductively coupled to an inductor of the wireless charging receiver.

3. The system of claim 1 , wherein the control signal causes a voltage output by the output of the wireless charging receiver to change.

4. The system of claim 1 , wherein the control signal causes the voltage output by the output of the wireless charging receiver to increase by a step amount.

5. The system of claim 1 , wherein the control signal causes the voltage output by the output of the wireless charging receiver to decrease by a step amount.

6. The system of claim 1 , wherein the regulator includes a switched capacitor regulator, and wherein the control signal causes the voltage output by the output of the wireless charging receiver to change to a voltage that is an integer multiple of a voltage output by the output of the regulator.

7. The system of claim 1 , wherein the controller sends the control signal based upon the ratio being greater than a value.

8. The system of claim 7 , wherein the value is a threshold about more than a conversion factor of the regulator.

9. The system of claim 1 , wherein the controller has a second output coupled to the regulator that causes the regulator to switch modes.

10. The system of claim 9 , wherein the controller causes the regulator to change from a first conversion mode of the regulator to a second conversion mode of the regulator.

11. The system of claim 10 , wherein the first conversion mode of the regulator has a different conversion factor that the second conversion mode of the regulator.

12. The system of claim 1 , wherein the first output of the controller is wirelessly coupled to the wireless charging transmitter.

13. The system of claim 1 , wherein the first output of the controller is wirelessly coupled to the wireless charging transmitter using the wireless charging receiver.

14. The system of claim 1 , wherein the input of the regulator is also coupled to an adapter port configured to be coupled to a wired charging adapter.

15. The system of claim 14 , wherein the controller determines whether a wired charging adapter is coupled to the adapter port, and when the controller determines that a wired charging adapter is coupled to the adapter port, the controller controls an output voltage provided by the adapter.

16. The system of claim 14 , wherein the controller controls the output voltage provided by the adapter to be an integer multiple of a voltage provided at the output of the regulator.

17. The system of claim 14 , wherein the input of the regulator is coupled to the wireless charging receiver by a switch.

18. The system of claim 14 , wherein the input of the regulator is coupled to the adapter port by a switch.