Static power derating for dynamic charging
Certain aspects of the present disclosure are generally directed to apparatus and techniques for apparatus for wireless charging. The apparatus generally includes a first wireless charging element, and transmit circuitry coupled to the first wireless charging element and configured to supply power to the first wireless charging element to transmit a wireless charging field to a vehicle. In certain aspects, the apparatus also includes a controller coupled to the transmit circuitry and configured to determine a charging condition indicative of a speed of the vehicle, and adjust the power supplied to the first wireless charging element via the transmit circuitry based on the determination.
1. An apparatus for wireless charging, comprising:
a first wireless charging element;
transmit circuitry coupled to the first wireless charging element and configured to supply power to the first wireless charging element to transmit a wireless charging field to a vehicle; and
a controller coupled to the transmit circuitry and configured to:
determine a charging condition indicative of a speed of the vehicle;
determine the speed of the vehicle based on the charging condition; and
adjust the power supplied to the first wireless charging element via the transmit circuitry based on the speed of the vehicle.
2. The apparatus of claim 1 , wherein the controller is configured to determine the charging condition based on an amount of power transferred to the vehicle via a second wireless charging element.
3. The apparatus of claim 1 , wherein the controller is configured to determine the speed by determining an amount of time the vehicle receives charge from a second wireless charging element.
4. The apparatus of claim 1 , wherein the controller is configured to determine the speed of the vehicle by determining an amount of time between the vehicle receiving charge from a second wireless charging element and the vehicle receiving charge from a third wireless charging element.
5. The apparatus of claim 4 , wherein the first wireless charging element is different from the third wireless charging element.
6. The apparatus of claim 1 , wherein the controller is configured to determine the speed of the vehicle by receiving an indication of the speed from the vehicle.
7. The apparatus of claim 1 , wherein the transmit circuitry is configured to adjust the power by decreasing the power if the speed decreases.
8. The apparatus of claim 1 , wherein the transmit circuitry is configured to adjust the power supplied to the first wireless charging element by adjusting a duty cycle of pulses of power provided to the first wireless charging element.
9. The apparatus of claim 1 , wherein the transmit circuitry is configured to adjust the power supplied to the first wireless charging element by adjusting an amount of current provided to the first wireless charging element.
10. The apparatus of claim 1 , wherein the controller is further configured to determine at least one of a temperature of a component used to charge the vehicle or an ambient temperature, wherein the power is further adjusted based on the temperature determination.
11. The apparatus of claim 10 , wherein determining the at least one of the temperature of the component or the ambient temperature comprises estimating the at least one of the temperature of the component or the ambient temperature.
12. The apparatus of claim 1 , wherein:
the controller is further configured to determine a power demand of the vehicle based on the charging condition; and
the transmit circuitry is configured to decrease the power supplied to the first wireless charging element if the power demand of the vehicle decreases.
13. The apparatus of claim 1 , wherein:
the controller is further configured to determine an amount of the power to be supplied to the first wireless charging element to maintain a charging rate of a battery of the vehicle; and
the transmit circuitry is configured to adjust the power based on the determined amount of the power.
14. The apparatus of claim 1 , wherein:
the controller is further configured to determine a power restriction of a plurality of wireless charging elements; and
the transmit circuitry is configured to adjust the power based on the power restriction.
15. An apparatus for wireless charging a vehicle having a battery, comprising:
a wireless power receiving element;
receive circuitry coupled to the wireless power receiving element; and
a controller coupled to the receive circuitry and configured to:
determine an indication of a speed of the vehicle;
based on the speed of the vehicle, determine an amount of power to be transferred to the battery to maintain a charging rate for the battery; and
adjust a power transferred to the battery from the wireless power receiving element based on the determined amount of power.
16. The apparatus of claim 15 , wherein the controller is configured to determine the indication of the speed by determining a charging condition of the vehicle.
17. The apparatus of claim 16 , wherein the receive circuitry is configured to decrease power transferred to at least one of the battery or one or more electronic components of the vehicle if the speed decreases.
18. The apparatus of claim 15 , wherein the controller is configured to determine the indication of the speed of the vehicle by receiving the indication of the speed from the vehicle.
19. The apparatus of claim 15 , wherein the controller is further configured to determine at least one of a temperature of a component used to charge the battery or an ambient temperature, wherein the power is further adjusted based on the temperature determination.
20. The apparatus of claim 19 , wherein determining the at least one of the temperature of the component or the ambient temperature comprises measuring the at least one of the temperature of the component or the ambient temperature.
21. An apparatus for wireless charging a vehicle having a battery, the apparatus comprising:
a wireless power receiving element;
receive circuitry coupled to the wireless power receiving element; and
a controller coupled to the receive circuitry and configured to:
determine an indication of a speed of the vehicle;
based on the speed of the vehicle, determine a power restriction of a plurality of wireless charging elements; and
adjust a power transferred to the battery from the wireless power receiving element based on the power restriction.
22. The apparatus of claim 21 , wherein the controller is configured to further adjust the power transferred to the battery from the wireless power receiving element to maintain a charging rate for the battery.
23. A method for wireless charging, comprising:
supplying, by transmit circuitry coupled to a first wireless charging element, power to the first wireless charging element to transmit a wireless charging field to a vehicle;
determining, by a controller coupled to the transmit circuitry, a charging condition indicative of a speed of the vehicle, wherein an amount of the power supplied to the first wireless charging element is adjusted based on the determination; and
determining, by the controller, the speed of the vehicle based on the charging condition, the determining of the speed including determining an amount of time the vehicle receives charge from a second wireless charging element.
24. The method of claim 23 , further comprising determining an amount of power transferred to the vehicle via a second wireless charging element, wherein the charging condition is determined based on the amount of power transferred.
25. A method for wireless charging comprising:
supplying, by transmit circuitry coupled to a first wireless charging element, power to the first wireless charging element to transmit a wireless charging field to a vehicle;
determining, by a controller coupled to the transmit circuitry, a charging condition indicative of a speed of the vehicle, wherein an amount of the power supplied to the first wireless charging element is adjusted based on the determination; and
determining, by the controller, a speed of the vehicle based on the charging condition, the determining of the speed of the vehicle including determining an amount of time between the vehicle receiving charge from a second wireless charging element and the vehicle receiving charge from a third charging element.
26. The method of claim 25 , wherein the amount of time between the vehicle receiving charge from the second wireless charging element and the vehicle receiving charge from the third wireless charging element is determined based on feedback received from each of the second wireless charging element and the third wireless charging element.
27. A method for wireless charging a vehicle having a battery, comprising:
transferring, by receive circuitry coupled to a wireless power receiving element, power to the battery from the wireless power receiving element;
determining, by a controller coupled to the receive circuitry, an indication of a speed of the vehicle;
determining, by the controller and based on the speed of the vehicle, an amount of power to be transferred to the battery to maintain a charging rate for the battery; and
adjusting, by the controller, a power transferred to the battery from the wireless power receiving element based on the determined amount of power.
28. The method of claim 27 , wherein determining an indication of the speed of the vehicle of the vehicle comprises determining a charging condition of the vehicle.
29. The method of claim 27 , wherein determining an indication of the speed of the vehicle of the vehicle comprises receiving an indication of the speed from the vehicle.
30. The method of claim 27 , further comprising decreasing, by the controller, power transferred to at least one of the battery or one or more electronic components of the vehicle if the speed decreases.