Wireless charging system and charging control method for dynamically adjusting output power

• US 10,298,048 B1
• Filed: 03/10/2015
• Issued: 05/21/2019
• Est. Priority Date: 04/15/2014
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Juan, Kuan-Kai, Tsai, Li-Ting
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): Piggush, Aaron
• Application Number:
  US14/642,765
• Time in Patent Office: 1,533 Days
• Field of Search: 320108, 320140, 320145, 320163
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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

A wireless charging system is provided. The wireless charging system includes a wireless power receiver circuit and a power management unit. The wireless power receiver circuit is arranged for adjusting an output power according to charging information. The power management unit is coupled to the wireless power receiver circuit, and is arranged for receiving the output power from the wireless power receiver circuit to charge an energy source, and transmitting the charging information to the wireless power receiver circuit.

Claims

1. A wireless charging system, comprising:

a wireless power receiver circuit comprising a rectifier, the wireless power receiver circuit configured to adjust an output power of the rectifier to a target range or a target level according to charging information, wherein the charging information indicates a charging mode of the wireless charging system from a plurality of charging modes of the wireless charging system comprising a fast charging mode and a high efficiency charging mode, and the wireless power receiver circuit produces a higher output voltage when the charging information indicates the wireless charging system operates in the fast charging mode than in the high efficiency charging mode; and

a power management unit, coupled to the wireless power receiver circuit, the power management unit configured to receive the output power from the wireless power receiver circuit to charge an energy source, and configured to transmit the charging information to the wireless power receiver circuit.

2. The wireless charging system of claim 1, wherein the charging information comprises the target range or the target level of the output power.

3. The wireless charging system of claim 1, wherein the wireless power receiver circuit further generates control information according to the charging information, and the wireless charging system further comprises:

a wireless power transmitter circuit, coupled to the wireless power receiver circuit, the wireless power transmitter circuit configured to adjust a wireless power according to the control information, wherein the wireless power receiver circuit receives the wireless power to generate the output power.

4. The wireless charging system of claim 3, wherein the wireless power receiver circuit calculates a difference between an energy level of the output power and the target range or the target level indicated by the charging information to generate the control information.

5. The wireless charging system of claim 3, wherein the wireless power receiver circuit comprises:

a controller, coupled to the rectifier, the controller configured to receive the charging information to generate the control information.

6. The wireless charging system of claim 5, wherein the controller calculates a difference between an energy level of the output power of the rectifier and the target range or the target level indicated by the charging information to generate the control information.

7. A control method of a wireless charging system, the wireless charging system comprising a power management unit and a wireless power receiver circuit comprising a rectifier, the power management unit being arranged for receiving an output power of the rectifier to charge an energy source, the control method comprising:

utilizing the power management unit to transmit charging information, wherein the charging information indicates a charging mode of the wireless charging system from a plurality of charging modes of the wireless charging system comprising a fast charging mode and a high efficiency charging mode; and

adjusting the output power of the rectifier to a target range or a target level according to the charging information, wherein the output power is higher when the charging information indicates the wireless charging system operates in the fast charging mode than in the high efficiency charging mode.

8. The control method of claim 7, wherein the charging information comprises the target range or the target level of the output power.

9. The control method of claim 7, further comprising:

generating control information according to the charging information;

adjusting a wireless power according to the control information; and

receiving the wireless power to generate the output power.

10. The control method of claim 9, wherein generating the control information according to the charging information comprises:

calculating a difference between an energy level of the output power and the target range or the target level indicated by the charging information to generate the control information.

11. The control method of claim 7, wherein the charging information comprises the target range or the target level of the output power.

12. The control method of claim 9, further comprising:

transmitting the control information to a wireless power transmitter circuit that generates the wireless power.

13. A wireless charging system, comprising:

a wireless power receiver circuit comprising a rectifier, the wireless power receiver circuit configured to adjust an output power of the rectifier to a target range or a target level according to charging information; and

a power management unit, coupled to the wireless power receiver circuit, the power management unit configured to receive the output power from the wireless power receiver circuit to charge an energy source, and configured to transmit the charging information to the wireless power receiver circuit, wherein the charging information indicates a charging status of the energy source and/or a charging mode of the wireless charging system from a plurality of charging modes of the wireless charging system comprising a fast charging mode and a high efficiency charging mode, and the wireless power receiver circuit produces a higher output voltage when the charging information indicates the wireless charging system operates in the fast charging mode than in the high efficiency charging mode.

14. The wireless charging system of claim 13, wherein the charging information comprises the target range or the target level of the output power.

15. The wireless charging system of claim 13, wherein the wireless power receiver circuit further generates control information according to the charging information, and the wireless charging system further comprises:

a wireless power transmitter circuit, coupled to the wireless power receiver circuit, the wireless power transmitter circuit configured to adjust a wireless power according to the control information, wherein the wireless power receiver circuit receives the wireless power to generate the output power.

16. The wireless charging system of claim 15, wherein the wireless power receiver circuit calculates a difference between an energy level of the output power and the target range or the target level indicated by the charging information to generate the control information.

17. The wireless charging system of claim 15, wherein the wireless power receiver circuit comprises:

a controller, coupled to the rectifier, the controller configured to receive the charging information to generate the control information.

18. The wireless charging system of claim 17, wherein the controller calculates a difference between an energy level of the output power of the rectifier and the target range or the target level indicated by the charging information to generate the control information.