POWER FEEDING APPARATUS AND POWER FEEDING SYSTEM

• US 20180123397A1
• Filed: 10/26/2017
• Published: 05/03/2018
• Est. Priority Date: 10/31/2016
• Status: Active Grant

• Current Assignee: Daihen Corporation
• Original Assignee: Daihen Corporation
• Inventors: TSUKIYAMA, Daisuke
• Granted Patent: US 10,608,473 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02M 7/44 by static converters

Abstract

Provided is a power feeding apparatus in a power feeding system that is configured to transmit, in a contactless fashion, electric power from the power feeding apparatus to a power receiving apparatus by magnetic coupling. The power feeding apparatus includes a power feeding resonator, a power supply, a communicator, and a controller. The power supply is configured to output a high-frequency signal to the power feeding resonator. The communicator is configured to receive load information from the power receiving apparatus. The load information includes information on at least a voltage between the voltage and a current of a load coupled to the power receiving apparatus. The controller is configured to perform, on the power supply, a control of the high-frequency signal on a basis of the load information received by the communicator, after starting of the output of the high-frequency signal by the power supply.

Claims

1. A power feeding apparatus in a power feeding system, the power feeding system being configured to transmit, in a contactless fashion, electric power from the power feeding apparatus to a power receiving apparatus to which a load is to be coupled, the electric power being transmitted by magnetic coupling, the power feeding apparatus comprising:

a power feeding resonator;

a power supply configured to output a high-frequency signal to the power feeding resonator;

a communicator configured to receive load information from the power receiving apparatus, the load information including information on at least a voltage between the voltage and a current of the load coupled to the power receiving apparatus; and

a controller configured to perform, on the power supply, a control of the high-frequency signal on a basis of the load information received by the communicator, after starting of the output of the high-frequency signal by the power supply.

2. The power feeding apparatus according to claim 1, wherein

the power supply includes a DC-AC inverter provided in an output stage of the power supply, and

the controller controls the high-frequency signal by generating, on a basis of a voltage value of the load and deviation, a PWM signal and outputting the generated PWM signal to the DC-AC inverter, the deviation being deviation between a target current value and a current value of the load.

3. The power feeding apparatus according to claim 2, wherein the controller derives a gain that corresponds to the voltage value of the load, and generates the PWM signal on a basis of the derived gain and the deviation.

4. The power feeding apparatus according to claim 1, wherein

the power supply includes a DC-DC converter and a DC-AC inverter coupled to an output of the DC-DC converter, and

the controller controls the high-frequency signal by generating, on a basis of a voltage value of the load, a PWM signal and outputting the generated PWM signal to the DC-DC converter.

5. The power feeding apparatus according to claim 4, wherein the controller generates the PWM signal to cause an output voltage of the DC-DC converter to follow a variation in the voltage value of the load.

6. A power feeding apparatus in a power feeding system, the power feeding system being configured to transmit, in a contactless fashion, electric power from the power feeding apparatus to a power receiving apparatus to which a load is to be coupled, the electric power being transmitted by magnetic coupling, the power feeding apparatus comprising:

a power feeding resonator;

a power supply configured to output a high-frequency signal to the power feeding resonator;

a communicator configured to receive power-receiving-side information from the power receiving apparatus, the power-receiving-side information including information on a distance and information on a current of the load coupled to the power receiving apparatus, the distance being a distance between the power feeding apparatus and the power receiving apparatus and relating to the magnetic coupling; and

a controller configured to perform, on the power supply, a control of the high-frequency signal on a basis of the power-receiving-side information received by the communicator, after starting of the output of the high-frequency signal by the power supply.

7. The power feeding apparatus according to claim 6, wherein

the power supply includes a DC-AC inverter provided in an output stage of the power supply, and

the controller controls the high-frequency signal by generating, on a basis of the distance and deviation, a PWM signal and outputting the generated PWM signal to the DC-AC inverter, the deviation being deviation between a target current value and a current value of the load.

8. The power feeding apparatus according to claim 7, wherein the controller derives a gain that corresponds to the distance, and generates the PWM signal on a basis of the derived gain and the deviation.

9. A power feeding system configured to transmit, in a contactless fashion, electric power by magnetic coupling, the power feeding system comprising:

a power feeding apparatus configured to transmit the electric power; and

a power receiving apparatus to which a load is to be coupled, and configured to receive the electric power transmitted from the power feeding apparatus,

the power receiving apparatus including

a power receiving resonator,

a detector configured to perform a detection of at least a voltage between the voltage and a current of the load coupled to the power receiving apparatus, and

a first communicator configured to transmit a result of the detection performed by the detector to the power feeding apparatus, and

the power feeding apparatus including

a power feeding resonator,

a power supply configured to output a high-frequency signal to the power feeding resonator,

a second communicator configured to receive the result of the detection from the first communicator, and

a controller configured to perform, on the power supply, a control of the high-frequency signal on a basis of the result of the detection received by the second communicator, after starting of the output of the high-frequency signal by the power supply.

10. A power feeding system configured to transmit, in a contactless fashion, electric power by magnetic coupling, the power feeding system comprising:

a power feeding apparatus configured to transmit the electric power; and

a power receiving apparatus to which a load is to be coupled, and configured to receive the electric power transmitted from the power feeding apparatus,

the power receiving apparatus including

a power receiving resonator,

a current detector configured to perform a detection of a current of the load coupled to the power receiving apparatus, and

a first communicator configured to transmit a result of the detection performed by the current detector to the power feeding apparatus, and

the power feeding apparatus including

a power feeding resonator,

a power supply configured to output a high-frequency signal to the power feeding resonator,

a second communicator configured to receive the result of the detection from the first communicator,

a distance measuring device configured to measure a distance that is between the power feeding apparatus and the power receiving apparatus and relates to the magnetic coupling, and

a controller configured to perform, on the power supply, a control of the high-frequency signal on a basis of the distance obtained by the distance measuring device and the result of the detection received by the second communicator, after starting of the output of the high-frequency signal by the power supply.