Power regulation in wireless charging

1. An apparatus for power regulation in a wireless power receiver, comprising:

a wireless power receiving coil to receive wireless power from a power transmitting unit;

circuitry coupled to the wireless power receiving coil to transform an AC voltage received at the wireless power receiving coil to a regulated DC voltage;

a power switch that couples the regulated DC voltage to a battery, wherein the power switch is configured to selectively supply the regulated DC voltage to the battery at a regulated current; and

a load modulation logic configured to modulate the load on the wireless power receiving coil by toggling the power switch to couple the regulated DC voltage to the battery according to a load modulation signaling pattern to be detected by the power transmitting unit.

2. The apparatus of claim 1 , wherein the regulated DC voltage is a predefined voltage based on at least one characteristic of the battery.

3. The apparatus of claim 1 , wherein the load modulation logic is a component of a charger circuit of the battery.

4. The apparatus of claim 3 , wherein the charger circuit of the battery is configured to receive rectified voltage and generate the regulated DC voltage.

5. The apparatus of claim 1 , wherein the load modulation signaling comprises a beacon extension request.

6. The apparatus of claim 5 , wherein the beacon extension request extends a time period to complete a wireless handshake between the wireless power receiver and a wireless power transmitter inductively coupled to the wireless power receiver.

7. The apparatus of claim 1 , wherein the load modulation logic is configured to:

detect a power level available in the battery; and

initiate only power rail that is associated with a wireless handshake component if the power level available in the battery is below a predefined threshold.

8. The apparatus of claim 7 , wherein the load modulation logic is configured to initiate power rail for a system boot if the power level available in the battery is above the predefined threshold.

9. The apparatus of claim 1 , wherein the load modulation logic is configured to modulate the load on the wireless power receiving coil within a predefined power range.

10. The apparatus of claim 1 , wherein the apparatus is a component of a computing device, and wherein the load modulation occurs during an initialization phase of the computing device.

11. A method for power regulation in a wireless power receiver, comprising:

receive wireless power from a power transmitting unit at a wireless power receiving coil;

transform an AC voltage received at the wireless power receiving coil to a regulated DC voltage;

and

modulating the load on the wireless power receiving coil by toggling a power switch that couples the regulated DC voltage to a battery, wherein the toggling generates a load modulation signal to be received by the power transmitting unit.

12. The method of claim 11 , wherein the regulated DC voltage is predefined based on at least one characteristic of the battery.

13. The method of claim 11 , wherein the toggling the power switch is performed by a component of a battery charger circuit.

14. The method of claim 13 , further comprising receiving rectified voltage and generating the regulated DC voltage via a charger circuit of the battery.

15. The method of claim 11 , wherein generating load modulation signaling comprises issuing a beacon extension request.

16. The method of claim 15 , wherein issuing the beacon extension request comprises generating a time period extension to complete a wireless handshake between the wireless power receiver and a wireless power transmitter inductively coupled to the wireless power receiver.

17. The method of claim 11 , further comprising:

detecting a power level available in the battery; and

initiating only power rail associated with a wireless handshake component if the power level available in the battery is below a predefined threshold.

18. The method of claim 17 , further comprising initiating power rail for a system boot if the power level available in the battery is above the predefined threshold.

19. The method of claim 11 , further comprising generating the load modulation signaling within a predefined power range.

20. The method of claim 11 , wherein the load modulation occurs during an initialization phase of a computing device.

21. A system for power regulation in a wireless power receiver, comprising:

a wireless power receiving coil to receive wireless power from a power transmitting unit;

a battery charger circuit to receive a rectified voltage from the wireless power receiving coil and generate a regulated voltage;

a power switch to selectively supply the regulated voltage to a battery at a regulated current; and

a load modulation logic to modulate the load on the wireless power receiving coil by toggling the power switch to couple the regulated voltage to the battery according to a load modulation signaling pattern to be detected by the power transmitting unit.

22. The system of claim 21 , wherein the load modulation generates a beacon extension request.

23. The system of claim 22 , wherein the beacon extension request extends a time period to complete a wireless handshake between the wireless power receiver and a wireless power transmitter inductively coupled to the wireless power receiver.

24. The system of claim 21 , wherein the load modulation logic is to:

detect a power level available in the battery;

initiate only power rail associated with a wireless handshake component if the power level available in the battery is below a predefined threshold; and

initiate power rail for a system boot if the power level available in the battery is above the predefined threshold.

25. The system of claim 21 , wherein the load modulation modulates the load on the wireless power receiving coil within a predefined power range.