Wireless charging apparatus and method
Disclosed is a wireless charging apparatus and method, the apparatus including a controller configured to control the wireless charging apparatus, and a transmitter configured to form a rotating magnetic field in a three-dimensional (3D) space in response to a first clock signal and a second clock signal generated under a control of the controller, wherein a phase difference between the first clock signal and the second clock signal is 90 degrees.
1. A wireless charging apparatus comprising:
a controller configured to control the wireless charging apparatus; and
a transmitter configured to form a uniform magnetic field in a three-dimensional (3D) space based on a control of the controller,
wherein the controller is configured to change a phase of a current supplied to the coil of the transmitter,
wherein the transmitter includes first coils and second coils consisting of a pair of coils,
wherein a pair of first coils faces each other, and a pair of second coils faces each other in the 3D space,
wherein the controller supplies a first current into the pair of first coils and supplies a second current into the pair of second coils, and a phase difference between the first current and the second current is 90 degree,
wherein the transmitter includes:
a first inverter configured to supply currents to first coils among the plurality of coils in response to a first clock signal and a reversed first clock signal; and
a second inverter configured to supply currents to second coils among the plurality of coils in response to a second clock signal and a reversed second clock signal.
2. The wireless charging apparatus of claim 1 , wherein the first coils are arranged in a first direction in parallel and the second coils are arranged in a second direction in parallel.
3. The wireless charging apparatus of claim 1 , wherein the transmitter further includes a third inverter configured to supply a current to a third coil among the plurality of coils in response to a third clock signal, and
the third coil is disposed on a bottom face of the wireless charging apparatus.
4. The wireless charging apparatus of claim 1 , wherein the transmitter further includes:
a phase reverser configured to reverse a phase of the first clock signal and a phase of the second clock signal.
5. The wireless charging apparatus of claim 1 , further comprising:
a clock signal generator configured to generate the first clock signal and the second clock signal.
6. The wireless charging apparatus of claim 5 , wherein the controller is configured to control a clock frequency of the clock signal generator based on a quiescent current.
7. The wireless charging apparatus of claim 6 , further comprising:
a supervisor configured to monitor the quiescent current.
8. The wireless charging apparatus of claim 1 , wherein the controller is configured to adjust a duty ratio between the first clock signal and the second clock signal based on a quiescent current.
9. The wireless charging apparatus of claim 1 , wherein the controller is configured to control a buck converter to adjust input power of the transmitter based on a quiescent current.
10. A wireless charging method performed by a wireless charging apparatus, the method comprising:
wherein the wireless charging apparatus includes a controller and a transmitter,
receiving, by the transmitter, a first clock signal and a second clock signal generated by the controller; and
forming, by the transmitter, a uniform magnetic field in a three-dimensional (3D) space,
wherein the controller is configured to change a phase of a current supplied to the coil of the transmitter,
wherein the transmitter includes first coils and second coils consisting of a pair of coils,
wherein a pair of first coils faces each other, and a pair of second coils faces each other in the 3D space,
wherein the controller supplies a first current into the pair of first coils and supplies a second current into the pair of second coils, and a phase difference between the first current and the second current is 90 degree,
wherein the forming includes:
supplying, by the transmitter, currents to first coils of the wireless charging apparatus in response to a first clock signal and a reversed first clock signal; and
supplying, by the transmitter, currents to second coils of the wireless charging apparatus in response to a second clock signal and a reversed second clock signal.
11. The wireless charging method of claim 10 , wherein the first coils are arranged in a first direction in parallel and the second coils are arranged in a second direction in parallel.
12. The wireless charging method of claim 10 , wherein the forming further includes supplying a current to a third coil of the wireless charging apparatus in response to a third clock signal, and
the third coil is disposed on a bottom face of the wireless charging apparatus.
13. The wireless charging method of claim 12 , wherein the first coils and the second coils are arranged on a wall of the wireless charging apparatus.
14. The wireless charging method of claim 10 , further comprising:
controlling, by the controller, frequencies of the first clock signal and the second clock signal based on a quiescent current.
15. The wireless charging method of claim 14 , further comprising:
wherein the wireless charging apparatus includes a supervisor,
monitoring, by the supervisor, the quiescent current.
16. The wireless charging method of claim 10 , further comprising:
adjusting, by the controller, a duty ratio between the first clock signal and the second clock signal based on a quiescent current.
17. The wireless charging method of claim 10 , further comprising:
adjusting, by the controller, an input power input to the wireless charging apparatus based on a quiescent current.