Power feeding apparatus and power feeding system

• US 10,608,473 B2
• Filed: 10/26/2017
• Issued: 03/31/2020
• Est. Priority Date: 10/31/2016
• Status: Active Grant

• Current Assignee: Daihen Corporation
• Original Assignee: Daihen Corporation
• Inventors: Tsukiyama, Daisuke
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Warmflash, Michael J
• Application Number:
  US15/794,472
• Publication Number:
  US 20180123397A1
• Time in Patent Office: 887 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 a voltage 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, the controller including a PWM generator to generate a PWM signal to control the high-frequency signal by way of at least one of proportional, integral, or derivative control, the PWM generator storing a gain table correlating a plurality of measured load voltage value ranges with respective feedback gain values serving as proportional, integral, and/or derivative elements, the PWM generator selecting one or more feedback gains for controlling the high-frequency signal based on matching the received load voltage to one of the plurality of measured load voltage value ranges in the gain table.

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 outputs the generated PWM signal to the DC-AC inverter.

3. 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 outputs the generated PWM signal to the DC-DC converter.

4. The power feeding apparatus according to claim 3, 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.

5. 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, the controller including a PWM generator to generate a PWM signal to control the high-frequency signal by way of at least one of proportional, integral, or derivative control, the PWM generator storing a gain table correlating a plurality of distance ranges with respective feedback gain values serving as proportional, integral, and/or derivative elements, the PWM generator selecting one or more feedback gains for controlling the high-frequency signal based on matching the received distance between the power feeding apparatus and the power receiving apparatus to one of the plurality of distance ranges in the gain table.

6. The power feeding apparatus according to claim 5, wherein the power supply includes a DC-AC inverter provided in an output stage of the power supply, and the controller outputs the generated PWM signal to the DC-AC inverter.

7. 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 a voltage 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, the controller including a PWM generator to generate a PWM signal to control the high-frequency signal by way of at least one of proportional, integral, or derivative control, the PWM generator storing a gain table correlating a plurality of measured load voltage value ranges with respective feedback gain values serving as proportional, integral, and/or derivative elements, the PWM generator selecting one or more feedback gains for controlling the high-frequency signal based on matching the received load voltage to one of the plurality of measured load voltage value ranges in the gain table, the controller including a PWM generator to generate a PWM signal to control the high-frequency signal by way of at least one of proportional, integral, or derivative control, the PWM generator storing a gain table correlating a plurality of distance ranges with respective feedback gain values serving as proportional, integral, and/or derivative elements, the PWM generator selecting one or more feedback gains for controlling the high-frequency signal based on matching the measured distance between the power feeding apparatus and the power receiving apparatus to one of the plurality of distance ranges in the gain table.

8. 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.