Electronic apparatus for power transfer using mechanical power transfer scheme, wireless power transfer method, and wireless power transfer system
According to one embodiment, an electronic apparatus capable of transferring power wirelessly to a power receiver apparatus, apparatus includes: a signal generation circuitry configured to generate a first signal for wireless power transfer; an antenna configured to radiate an electromagnetic wave on a basis of the first signal; an actuator capable of mechanically changing an orientation of the antenna; and a controlling circuitry configured to control a transmission power of the first signal according to the orientation of the antenna.
1. An electronic apparatus capable of transferring power wirelessly to a power receiver apparatus, apparatus comprising:
a signal generation circuitry configured to generate a first signal for wireless power transfer;
an antenna configured to radiate an electromagnetic wave;
an actuator capable of mechanically changing an orientation of the antenna, the orientation being changeable at least between a first orientation and a second orientation, the first orientation corresponding to a direction horizontal to an installation surface of the electronic apparatus and the second orientation corresponding to a direction vertical to the installation surface of the electronic apparatus;
at least one of a variable amplifier capable of changing a gain of the first signal and a variable attenuator capable of changing an attenuation of the first signal;
a memory configured to store correspondence data associating a plurality of orientations that the antenna may take with a plurality of attenuation values or a plurality of gain values, the plurality of orientations including the first orientation and the second orientation, and the correspondence data being configured such that the transmission power increases as the orientation of the antenna becomes closer from the first orientation to the second orientation; and
a controlling circuitry configured to control the transmission power of the electromagnetic wave according to the orientation of the antenna by controlling at least one of the variable amplifier or the variable attenuator on the basis of the correspondence data.
2. The electronic apparatus according to claim 1 , wherein the signal generation circuitry includes an amplifier and a variable attenuator, and
the controlling circuitry is configured to control the transmission power of the electromagnetic wave by controlling the variable attenuator.
3. The electronic apparatus according to claim 1 , wherein
the actuator is capable of changing at least an elevation angle from among an elevation angle and an azimuth angle of the antenna.
4. The electronic apparatus according to claim 3 , wherein
the controlling circuitry is configured to control the transmission power of the first signal to a first power value in a case in which the elevation angle of the antenna points in a first direction, and
control the transmission power of the first signal to a second power value smaller than the first power value in a case in which the elevation angle of the antenna points in a second direction closer to a direction horizontal to an installation surface of the electronic apparatus than the first direction.
5. The electronic apparatus according to claim 3 , wherein
the actuator is capable of changing the elevation angle of the antenna by moving the antenna along a concave rail.
6. The electronic apparatus according to claim 3 , wherein
the actuator includes a robot arm having one end connected to a base,
the antenna is connected to another end of the robot arm, and
the actuator is capable of changing the elevation angle of the antenna by driving the robot arm.
7. The electronic apparatus according to claim 3 , wherein
the actuator is capable of changing the azimuth angle of the antenna by rotating a support supporting the antenna.
8. The electronic apparatus according to claim 1 , further comprising:
a receive processing circuitry configured to perform, through the antenna, carrier sense of a second signal from another wireless system different from the power receiver apparatus, wherein
the controlling circuitry is configured to control the actuator on a basis of a result of the carrier sense.
9. The electronic apparatus according to claim 8 , wherein
the receive processing circuitry is configured to compare a receive power level of the second signal to a threshold value as the carrier sense, and
the controlling circuitry is configured to change the threshold value according to the orientation of the antenna.
10. The electronic apparatus according to claim 9 , wherein
when the receive power level is greater than the threshold value, the controlling circuitry is configured to control the actuator to change the orientation of the antenna, or to suspend transmission of the electromagnetic waves from the antenna.
11. The electronic apparatus according to claim 9 , wherein
the receive processing circuitry is configured to use a first threshold value in a case in which the elevation angle of the antenna points in a first direction, and
use a second threshold value larger than the first threshold value in a case in which the elevation angle of the antenna points in a second direction closer to a direction horizontal to an installation surface of the electronic apparatus than the first direction.
12. The electronic apparatus according to claim 1 , wherein
the antenna is provided with a radiator configured to radiate the electromagnetic waves and a reflector configured to reflect the electromagnetic waves radiated from the radiator, and
the antenna is capable of changing a direction in which the electromagnetic waves are reflected by moving the reflector relative to the radiator.
13. The electronic apparatus according to claim 1 , wherein
a first member capable of absorbing at least a portion of electromagnetic waves radiated from the antenna is provided in a location corresponding to a first direction that blocks leakage of the electromagnetic waves.
14. The electronic apparatus according to claim 1 , wherein
a second member capable of reflecting at least a portion of electromagnetic waves radiated from the antenna is provided in a location including a first location corresponding to a first direction that blocks leakage of the electromagnetic waves and a second location opposite the first location.
15. The electronic apparatus according to claim 1 , wherein
the controlling circuitry is configured to control the transmission power of the first signal on a basis of maximum output characteristics stipulating a maximum output value that the antenna may take in each elevation angle direction.
16. The electronic apparatus according to claim 15 , wherein
the maximum output value of a radiation level of the electromagnetic waves in a direction horizontal to an installation surface of the electronic apparatus is less than or equal to 1/100 a maximum radiation level of the antenna.
17. A wireless power transfer method of transferring power wirelessly to a power receiver apparatus, comprising:
mechanically changing an orientation of an antenna relative to the power receiver apparatus, the orientation being changeable at least between a first orientation and a second orientation, the first orientation corresponding to a direction horizontal to an installation surface of a power transfer apparatus and the second orientation corresponding to a direction vertical to the installation surface of the power transfer apparatus;
determining a transmission power of an electromagnetic wave for the wireless power transfer according to the orientation of the antenna;
generating a first signal on a basis of the transmission power;
radiating the electromagnetic wave from the antenna;
controlling the transmission power of the electromagnetic wave according to the orientation of the antenna by controlling at least one of a variable amplifier capable of changing a gain of the first signal and a variable attenuator capable of changing an attenuation of the first signal;
storing, in a memory, correspondence data associating a plurality of orientations that the antenna may take with a plurality of attenuation values or a plurality of gain values, and the correspondence data being configured such that the transmission power increases as the orientation of the antenna becomes closer from the first orientation to the second orientation; and
controlling the transmission power of the on a basis of the correspondence data.