ELECTRICITY TRANSMISSION SENDING METHOD AND DEVICE, AND SYSTEM

• US 20150188365A1
• Filed: 12/24/2014
• Published: 07/02/2015
• Est. Priority Date: 12/31/2013
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: WANG, Fuchao, TIAN, Fan, ZHANG, Yuchao
• Granted Patent: US 10,230,273 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• 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 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A electricity transmission sending device includes: a transmission circuit and a coil, where the transmission circuit includes a signal sending unit and a controlling unit, and the coil includes at least two mutually perpendicular subcoils. The signal sending unit is configured to receive a required power signal and an actually received power signal that are sent by the electricity transmission receiving device; and the controlling unit is configured to adjust a magnetic field direction in which wireless electricity transmission to the electricity transmission receiving device is performed and control the coil to transmit electric energy to the electricity transmission receiving device in an optimal magnetic field direction, where the optimal magnetic field direction refers to a corresponding magnetic field direction when a power value of electric energy actually received by the electricity transmission receiving device is maximum in a case of specific output power of the coil.

Claims

1. An electricity transmission sending device, wherein the electricity transmission sending device is configured to perform wireless electricity transmission to an electricity transmission receiving device and the electricity transmission sending device comprises an transmission circuit and a coil, wherein the transmission circuit comprises a signal sending unit and a controlling unit, and the coil comprises at least two mutually perpendicular subcoils, wherein:

the signal sending unit is configured to receive a required power signal and an actually received power signal that are sent by the electricity transmission receiving device, wherein the required power signal comprises a power value of electric energy required by the electricity transmission receiving device and the actually received power signal comprises a power value of electric energy actually received by the electricity transmission receiving device;

the controlling unit is configured to adjust a magnetic field direction in which wireless electricity transmission to the electricity transmission receiving device is performed, control the coil to transmit electric energy to the electricity transmission receiving device in an optimal magnetic field direction, and adjust output power of the coil, so that the power value of electric energy actually received by the electricity transmission receiving device is equal to the power value of required electric energy, wherein the optimal magnetic field direction refers to a corresponding magnetic field direction when a power value of electric energy actually received by the electricity transmission receiving device is maximum in a case of specific output power of the coil; and

the coil is configured to generate a magnetic field and transmit, in the optimal magnetic field direction, electric energy to the electricity transmission receiving device.

2. The device according to claim 1, wherein the controlling unit specifically comprises:

a directing unit, configured to adjust an amplitude ratio and a phase difference between currents of the at least two mutually perpendicular subcoils, so as to control the magnetic field direction to perform step change and determine a corresponding magnetic field direction when the power value of the actually received electric energy is maximum in the step change process as the optimal magnetic field direction; and

a power transmission unit, configured to control the coil to transmit electric energy to the electricity transmission receiving device in the optimal magnetic field direction and adjust output power of the electricity transmission sending device, so that the power value of the electric energy actually received by the electricity transmission receiving device is equal to the power value of the required electric energy.

3. The device according to claim 2, wherein the directing unit comprises:

a step controlling unit, configured to adjust the amplitude ratio and the phase difference between the currents of the at least two mutually perpendicular subcoils, so as to control the magnetic field direction to step towards a same direction at a fixed angle until the magnetic field direction returns to an initial position before the stepping; and

a sampling and comparing unit, configured to obtain a power value of electric energy actually received by the electricity transmission receiving device before the stepping and obtain a power value of actually received electric energy, which is obtained after each stepping;

compare all the obtained power values of the actually received electric energy; and

determine a magnetic field direction corresponding to a maximum power value of the actually received electric energy as the optimal magnetic field direction.

4. The device according to claim 3, wherein the step controlling unit comprises a delayer, a direct current voltage-adjustable power source, and a high frequency inverter, wherein:

the high frequency inverter is configured to convert a direct current output by the direct current voltage-adjustable power source into an alternating current and then output the alternating current to the at least two mutually perpendicular subcoils;

the delayer is configured to delay a frequency driving signal, wherein the delayed frequency driving signal is used to generate a phase difference between the currents of the at least two mutually perpendicular subcoils, wherein the phase difference is used to determine a range of a two-dimensional quadrant or a three-dimensional quadrant in which a direction of the magnetic field generated by the coil is located; and

the direct current voltage-adjustable power source is configured to output a direct current and adjust the amplitude ratio between the currents output to the at least two mutually perpendicular subcoils, so as to adjust the direction of the magnetic field generated by the coil to perform step change within the range.

5. An electric energy transmission system, comprising an electricity transmission sending device and an electricity transmission receiving device, wherein the electricity transmission sending device is the electricity transmission sending device according to claim 1 and the electricity transmission sending device performs wireless electricity transmission to the electricity transmission receiving device;

and

the electricity transmission receiving device comprises an electricity transmission receiving circuit that is configured to receive wireless electricity transmission and a receiving coil, wherein the receiving coil comprises a signal sending unit, wherein the signal sending unit is configured to send a required power signal and an actually received power signal to the electricity transmission sending device; and

the electricity transmission receiving circuit is configured to receive electric energy that the electricity transmission sending device transmits by means of wireless electricity transmission.

6. An electricity transmission sending method, comprising:

receiving a required power signal and an actually received power signal that are sent by an electricity transmission receiving device, wherein the required power signal comprises a power value of electric energy required by the electricity transmission receiving device and the actually received power signal comprises a power value of electric energy actually received by the electricity transmission receiving device;

adjusting a magnetic field direction in which wireless electricity transmission to the electricity transmission receiving device is performed, so as to transmit electric energy to the electricity transmission receiving device in an optimal magnetic field direction, wherein the optimal magnetic field direction is a corresponding magnetic field direction when a power value of electric energy actually received by the electricity transmission receiving device is maximum in a case of specific output power of a coil; and

adjusting output power so that the power value of electric energy actually received by the electricity transmission receiving device in the optimal magnetic field direction is equal to the power value of required electric energy.

7. The method according to claim 6, wherein the adjusting a magnetic field direction in which wireless electricity transmission to the electricity transmission receiving device is performed, so as to transmit electric energy to the electricity transmission receiving device in an optimal magnetic field direction, comprises:

adjusting, in a case of specific output power of the coil, the magnetic field direction by adjusting an amplitude ratio and a phase difference between currents of two or three mutually perpendicular subcoils, so as to cause the magnetic field direction to perform step change at a fixed angle;

determining, according to power values of actually received electric energy, which are received in the step change process of the magnetic field direction, a corresponding magnetic field direction when the power value of the electric energy actually received by the electricity transmission receiving device is maximum as the optimal magnetic field direction; and

transmitting electric energy to the electricity transmission receiving device in the optimal magnetic field direction.

8. The method according to claim 7, wherein the determining, according to power values of actually received electric energy, which are received in the step change process of the magnetic field direction, a corresponding magnetic field direction when the power value of the electric energy actually received by the electricity transmission receiving device is maximum as the optimal magnetic field direction, comprises:

step 1;

obtaining a first power value of electric energy actually received by the electricity transmission receiving device in an initial position of a current magnetic field direction;

step 2;

controlling the magnetic field direction to step at the fixed angle and obtaining a second power value of actually received electric energy in an after-stepping magnetic field direction;

step 3;

comparing the first power value of the actually received electric energy and the second power value of the actually received electric energy, and using a larger value between the two as a maximum power value of the actually received electric energy;

step 4;

controlling the magnetic field direction to step at the fixed angle and obtaining a third power value of actually received electric energy in an after-stepping magnetic field direction;

step 5;

comparing the maximum power value of the actually received electric energy and the third power value of the actually received electric energy, and using a larger value between the two as a maximum power value of the actually received electric energy; and

step 6;

repeating the foregoing steps 1 to 5 until the magnetic field direction returns to the initial position, and using a magnetic field direction corresponding to the maximum power value of the actually received electric energy, which is obtained in the stepping process, as the optimal magnetic field direction.

9. The method according to claim 7, wherein the adjusting, in a case of specific output power of the coil, the magnetic field direction by adjusting an amplitude ratio and a phase difference between currents of two or three mutually perpendicular subcoils, so as to cause the magnetic field direction to perform step change at a fixed angle, comprises:

adjusting a range of a two-dimensional quadrant or a three-dimensional quadrant in which the magnetic field direction is located by adjusting the phase difference; and

adjusting a deflection angle of the magnetic field direction within the range by adjusting the amplitude ratio between the currents, so as to cause the magnetic field direction to perform step change at the fixed angle.

10. An electricity transmission sending apparatus, comprising:

a communications module, configured to receive a required power signal and an actually received power signal that are sent by an electricity transmission receiving device, wherein the required power signal comprises a power value of electric energy required by the electricity transmission receiving device and the actually received power signal comprises a power value of electric energy actually received by the electricity transmission receiving device;

an optimal electricity transmission module, configured to adjust a magnetic field direction in which wireless electricity transmission to the electricity transmission receiving device is performed, so as to transmit electric energy to the electricity transmission receiving device in an optimal magnetic field direction, wherein the optimal magnetic field direction is a corresponding magnetic field direction when a power value of electric energy actually received by the electricity transmission receiving device is maximum in a case of specific output power of a coil; and

an electric energy transmission module, configured to adjust output power of the coil so that the power value of electric energy actually received by the electricity transmission receiving device in the optimal magnetic field direction is equal to the power value of required electric energy.

11. The apparatus according to claim 10, wherein the optimal electricity transmission module comprises:

an adjusting unit, configured to adjust, in a case of specific output power of the coil, the magnetic field direction by adjusting an amplitude ratio and a phase difference between currents of two or three mutually perpendicular subcoils, so as to cause the magnetic field direction to perform step change at a fixed angle;

a direction determining unit, configured to determine, according to power values of actually received electric energy, which are received in the step change process of the magnetic field direction, a corresponding magnetic field direction when the power value of the electric energy actually received by the electricity transmission receiving device is maximum as the optimal magnetic field direction; and

an electricity transmission unit, configured to transmit electric energy to the electricity transmission receiving device in the optimal magnetic field direction and adjust output power of the coil, so that the power value of electric energy actually received by the electricity transmission receiving device is equal to the power value of required electric energy.

12. The apparatus according to claim 11, wherein the direction determining unit comprises:

a cyclic stepping unit, configured to control the magnetic field direction to step towards a same direction at the fixed angle until the magnetic field direction returns to an initial position; and

a comparing and determining unit, configured to obtain a power value of electric energy actually received by the electricity transmission receiving device before the stepping and obtain a power value of actually received electric energy, which is obtained after each stepping;

compare all the obtained power values of the actually received electric energy; and

determine a magnetic field direction corresponding to a maximum power value of the actually received electric energy as the optimal magnetic field direction.

13. The apparatus according to claim 11, wherein the adjusting unit is specifically configured to:

adjust a range of a two-dimensional quadrant or a three-dimensional quadrant in which the magnetic field direction is located by adjusting the phase difference; and

adjust a deflection angle of the magnetic field direction within the range by adjusting the amplitude ratio between the currents, so as to cause the magnetic field direction to perform step change at the fixed angle.