Method and apparatus for wirelessly receiving power

• US 9,276,435 B2
• Filed: 11/02/2012
• Issued: 03/01/2016
• Est. Priority Date: 11/02/2012
• Status: Active Grant

• Current Assignee: O2 Micro International Limited (O2 Micro Incorporated)
• Original Assignee: Maishi Electronic (Shanghai) Limited
• Inventors: Chen, Jun, Wang, Qiang, Yu, Mei, Peng, Xinsheng, Wang, James
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Pacheco, Rafael
• Application Number:
  US13/667,024
• Publication Number:
  US 20140125138A1
• Time in Patent Office: 1,215 Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

Method and apparatus for a receiving device to wirelessly receive electric power from a transmitting device. A power capacity is configured at the receiving device, based on a default power capacity known by both the receiving device and the transmitting device. A first value of a dependent parameter is read. The dependent parameter is associated with the electric power and varies in accordance with an independent parameter adjustable by the transmitting device. A second value of the dependent parameter is then read. A maximum power capacity of the transmitting device is identified based on at least the first and second values and a predetermined threshold. The electric power is then received from the transmitting device.

Claims

1. A method for a receiving device to wirelessly receive electric power from a transmitting device, the method comprising the steps of:

configuring, at the receiving device, a power capacity based on a default power capacity known by both the receiving device and the transmitting device;

reading a first value of a dependent parameter associated with the electric power, wherein the dependent parameter varies in accordance with an independent parameter adjustable by the transmitting device;

reading a second value of the dependent parameter;

identifying a maximum power capacity of the transmitting device based on at least the first and second values and a predetermined threshold; and

receiving the electric power from the transmitting device.

2. The method of claim 1, wherein the dependent parameter is at least one of voltage, current, and power.

3. The method of claim 1, wherein the independent parameter is at least one of voltage, frequency, and duty cycle.

4. The method of claim 1, further comprising the steps of:

sending a proprietary packet for adjustment to the transmitting device after reading the first value; and

delaying for a time interval before reading the second value.

5. The method of claim 4, further comprising the step of:

upon receiving the proprietary packet for adjustment, adjusting, by the transmitting device, the independent parameter based on content of the proprietary packet in the time interval.

6. The method of claim 1, wherein the step of identifying a maximum power capacity of the transmitting device further comprises:

calculating an output of a function, wherein the function has inputs of at least the first and second values;

comparing the output with the predetermined threshold, and

determining the maximum power capacity of the transmitting device based on at least a result of the comparison.

7. The method of claim 1, further comprising the steps of:

once the maximum power capacity of the transmitting device is identified, comparing the maximum power capacity with the default power capacity;

configuring a power capacity of the receiving device based on the maximum power capacity if the maximum power capacity is greater than the default power capacity; and

sending a proprietary packet for acknowledgement and a proprietary packet for error control to the transmitting device if the maximum power capacity is greater than the default power capacity.

8. The method of claim 7, further comprising the steps of:

configuring, by the transmitting device, a power capacity based on the maximum power capacity, if the proprietary packet for acknowledgement is received;

configuring, by the transmitting device, a power capacity based on the default power capacity, if the proprietary packet for acknowledgement is not received;

wirelessly transmitting, by the transmitting device, the electric power with the configured power capacity to the receiving device; and

analyzing, by the transmitting device, the proprietary packet for error control, if the proprietary packet for error control is received.

9. The method of claim 1, further comprising the step of sending a proprietary packet to the transmitting device for notifying the transmitting device a maximum power capacity of the receiving device.

10. An apparatus comprising a receiving device comprising:

a power reception unit configured to wirelessly receive electric power from a transmitting device;

a configuration unit operatively coupled to the power reception unit and configured to configure a power capacity based on a default power capacity known by both the receiving device and the transmitting device;

a reading unit operatively coupled to the power reception unit and configured to;

read a first value of a dependent parameter associated with the electric power, wherein the dependent parameter varies in accordance with an independent parameter adjustable by the transmitting device, and

read a second value of the dependent parameter; and

an identification unit operatively coupled to the configuration unit and the reading unit and configured to identify a maximum power capacity of the transmitting device based on at least the first and second values and a predetermined threshold.

11. The apparatus of claim 10, wherein the dependent parameter is at least one of voltage, current, and power.

12. The apparatus of claim 10, wherein the independent parameter is at least one of voltage, frequency, and duty cycle.

13. The apparatus of claim 10, further comprising:

a communication unit operatively coupled to the configuration unit and the power reception unit and configured to send a proprietary packet for adjustment to the transmitting device after the reading unit reads the first value; and

a timer operatively coupled to the reading unit and the communication unit and configured to delay for a time interval before the reading unit reads the second value.

14. The apparatus of claim 10, wherein the identification unit further comprises:

a processor configured to calculate an output of a function, wherein the function has inputs of at least the first and second values;

a comparison unit configured to compare the output with the predetermined threshold; and

a determining unit configured to determine the maximum power capacity of the transmitting device based on at least an output of the comparison unit.

15. The apparatus of claim 10, further comprising:

a comparison unit configured to compare the maximum power capacity of the transmitting device with the default power capacity, once the maximum power capacity is identified by the identification unit; and

a communication unit configured to send a proprietary packet for acknowledgement and a proprietary packet for error control to the transmitting device if the maximum power capacity is greater than the default power capacity, wherein the configuration unit is further configured to configure a power capacity of the receiving device based on the maximum power capacity if the maximum power capacity is greater than the default power capacity.

16. The apparatus of claim 10, further comprising:

a communication unit configured to send a proprietary packet to the transmitting device for notifying the transmitting device a maximum power capacity of the receiving device.

17. A system for wirelessly receiving power comprising:

a receiving device comprising;

a power reception unit configured to wirelessly receive electric power from a transmitting device;

a configuration unit operatively coupled to the power reception unit and configured to configure a power capacity based on a default power capacity known by both the receiving device and the transmitting device;

a reading unit operatively coupled to the power reception unit and configured to;

read a first value of a dependent parameter associated with the electric power, wherein the dependent parameter varies in accordance with an independent parameter adjustable by the transmitting device, and

read a second value of the dependent parameter, and

an identification unit operatively coupled to the configuration unit and the reading unit and configured to identify a maximum power capacity of the transmitting device based on at least the first and second values and a predetermined threshold; and

a transmitting device comprising a power transmission unit configured to wirelessly transmit the electric power to the receiving device.

18. The system of claim 17, wherein the dependent parameter is at least one of voltage, current, and power.

19. The system of claim 17, wherein the independent parameter is at least one of voltage, frequency, and duty cycle.

20. The system of claim 17, wherein the receiving device further comprises:

a communication unit operatively coupled to the configuration unit and the power reception unit and configured to send a proprietary packet for adjustment to the transmitting device after the reading unit reads the first value; and

a timer operatively coupled to the reading unit and the communication unit and configured to delay for a time interval before the reading unit reads the second value.

21. The system of claim 20, wherein the transmitting device further comprises:

a communication unit operatively coupled to the power transmission unit and configured to receive the proprietary packet for adjustment; and

a control unit operatively coupled to the power transmission unit and the communication unit and configured to, upon receiving the proprietary packet for adjustment, adjust the independent parameter based on content of the proprietary packet for adjustment in the time interval.

22. The system of claim 17, wherein the identification unit further comprises:

a processor configured to calculate an output of a function, wherein the function has inputs of at least the first and second values,

a comparison unit configured to compare the output with the predetermined threshold; and

a determining unit configured to determine the maximum power capacity of the transmitting device based on at least an output of the comparison unit.

23. The system of claim 17, wherein the receiving device further comprises:

a comparison unit configured to compare the maximum power capacity of the transmitting device with the default power capacity, once the maximum power capacity is identified by the identification unit; and

a communication unit configured to send a proprietary packet for acknowledgement and a proprietary packet for error control to the transmitting device if the maximum power capacity is greater than the default power capacity, wherein the configuration unit is further configured to configure a power capacity of the receiving device based on the maximum power capacity if the maximum power capacity is greater than the default power capacity.

24. The system of claim 23, wherein the transmitting device further comprises:

a configuration unit configured to;

configure a power capacity based on the maximum power capacity, if the proprietary packet for acknowledgement is received, and

configure a power capacity based on the default power capacity, if the proprietary packet for acknowledgement is not received, and

an analyzing unit configured to analyze the proprietary packet for error control, if the proprietary packet for error control is received.

25. The system of claim 17, wherein the receiving device further comprises:

a communication unit configured to send a proprietary packet to the transmitting device for notifying the transmitting device a maximum power capacity of the receiving device.

26. A machine-readable tangible and non-transitory medium having information recorded thereon for a receiving device to wirelessly receive electric power from a transmitting device, wherein the information, when read by the machine, causes the machine to perform the following:

configuring, at the receiving device, a power capacity based on a default power capacity known by both the receiving device and the transmitting device;

reading, by the receiving device, a first value of a dependent parameter associated with the electric power, wherein the dependent parameter varies in accordance with an independent parameter adjustable by the transmitting device;

reading, by the receiving device, a second value of the dependent parameter;

identifying, by the receiving device, a maximum power capacity of the transmitting device based on at least the first and second values and a predetermined threshold; and

receiving, by the receiving device, the electric power from the transmitting device.

27. A method for a receiving device to wirelessly receive electric power from a transmitting device, the method comprising the steps of:

configuring, at the transmitting device, a power capacity based on a default power capacity known by both the receiving device and the transmitting device; and

transmitting the electric power to the receiving device, wherein the receiving device reads a first value and a second value of a dependent parameter associated with the electric power, and identifies a maximum power capacity of the transmitting device based on at least the first and second values and a predetermined threshold, and wherein the dependent parameter varies in accordance with an independent parameter adjustable by the transmitting device.

28. The method of claim 27, further comprising the steps of:

adjusting the independent parameter based on content of a proprietary packet for adjustment sent by the receiving device;

configuring a power capacity based on the maximum power capacity, if a proprietary packet for acknowledgement is received;

configuring a power capacity based on the default power capacity, if the proprietary packet for acknowledgement is not received;

wirelessly transmitting the electric power with the configured power capacity to the receiving device; and

analyzing a proprietary packet for error control, if the proprietary packet for error control is received.

29. An apparatus comprising a transmitting device comprising:

a configuration unit configured to configure a power capacity based on a default power capacity known by both a receiving device and the transmitting device; and

a power transmission unit operatively coupled to the configuration unit and configured to transmit electric power to the receiving device, wherein the receiving device reads a first value and a second value of a dependent parameter associated with the electric power, and identifies a maximum power capacity of the transmitting device based on at least the first and second values and a predetermined threshold, and wherein the dependent parameter varies in accordance with an independent parameter adjustable by the transmitting device.