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1. WO2019055787 - MODULAR AND EFFICIENT WIRELESS POWER TRANSFER SYSTEMS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

WHAT IS CLAIMED IS:

1. A device comprising:

a plurality of coils arranged along a perimeter within the device, wherein each coil comprises a winding configured to be coupled to a power converter through a resonant capacitor, each coil forming a resonator with the resonant capacitor;

a connection core magnetically coupled to the plurality of coils; and

a plurality of power converters, wherein each power converter is coupled to one of the plurality of coils and configured such that a current flowing through the winding of the coil has the same frequency as other winding currents in the device, and the phase angle of the current is approximately equal to the space angle of the coil, so a rotating magnetic field is formed in a space around the device.

2. The device of claim 1, wherein the device is a transmitter or a receiver of a wireless power transfer system.

3. The device of claim 1, wherein the plurality of power converters forms a multi-phase power converter.

4. The device of claim 1, wherein the windings are placed close to the connection core and interleaved to further improve the magnetic coupling between the windings.

5. The device of claim 1, wherein a resonant capacitor is a switchable capacitor or a variable capacitor.

6. The device of claim 5, wherein the capacitance of the resonant capacitor is controlled to balance the currents in the windings.

7. The device of claim 5, wherein the capacitance of the resonant capacitor is adjusted to control a voltage or a current of the device, or to protect the device.

8. The device of claim 1, wherein some coils are de-activated during a mode of operation, and wherein the phase angles of winding currents are adjusted according to the number of active coils.

9. The device of claim 1, wherein the switching frequency of the power converters is adjusted or hopped.

10. The device of claim 1, wherein the resonators are coupled to a wired charging connection block, and wherein the resonators and the wired charging block are configured to operate the device in either a wired charging mode or a wireless charging mode.

11. A system comprising:

an input port having an input voltage;

a first power converter coupled to the input port and comprising a first switch network having a plurality of first power switches;

an output port having an output voltage and an output current;

a second power converter coupled to the output port and comprising a second switch network having a plurality of second power devices;

a resonator block comprising a plurality of resonators, wherein each resonator comprises a resonant capacitor, and wherein a first resonator of the plurality of resonators is coupled to the first power converter, and a second resonator of the plurality of resonators is coupled to the second power converter; and

a connection block comprising a switching device and coupled to the first resonator, wherein the connection block, the first resonator and the second resonator are configured such that the system operates in a wireless charging mode with the resonator block activated or a wired charging mode with the connection block activated.

12. The system of claim 11, wherein the first resonator or the second resonator comprises a plurality of coils distributed symmetrically in space and magnetically coupled to a connection core, and each coil is coupled to a resonant capacitor, and wherein the currents in the coils are controlled to generate a rotating magnetic field in a space adjacent to the coils.

13. The system of claim 11, wherein the capacitance of a resonant capacitor is adjusted to deactivate the resonator block.

14. A method comprising:

configuring an output port of a system to have an output voltage and output current;

providing a plurality of first resonators, wherein each first resonator comprises a first resonant capacitor and a first coil, and wherein the first coils are placed along a first perimeter, and through the first resonant capacitors the first coils are connected to a plurality of first power converters comprising a plurality of first power switches;

providing a plurality of second resonators, wherein each second resonator comprises a second resonant capacitor and a second coil, and wherein the second coils are placed along a second perimeter, and through the second resonant capacitors the second coils are coupled to a plurality of second power converters comprising a plurality of second power switches;

establishing a magnetic coupling between the first coils and the second coils; and configuring a control block to control the system such that a rotating magnetic field is established between the first coils and second coils in a mode of operation.

15. The method of claim 14, further comprising controlling at least two variables selected from the switching frequency of the first power converter, the capacitance of a resonant capacitor in the first resonator, and the capacitance of a resonant capacitor in the second resonator to regulate the voltage or current at the output port while maintaining a soft-switching of a first power switch. 16. The method of claim 14, wherein the number of active first coils is different from the number of active second coils in a mode of operation.

17. The method of claim 14, wherein the first coils are magnetically coupled to each other through a connection core.

18. The method of claim 14, further comprising configuring the control block such that the capacitance of a resonant capacitor switches between two predetermined values in a mode of operation.

19. The method of claim 14, further comprising sensing a magnetic coupling strength signal between each first coil and each second coil, and using the magnetic coupling strength information to guide the moving of the first coils or second coils so a better magnetic coupling is established between the first coils and the second coils.

20. The method of claim 14, further comprising sensing a magnetic coupling strength signal between each first coil and each second coil, and using the magnetic coupling strength information to detect a metal object in the space between the first coils and the second coils.