POWER TRANSMITTING APPARATUS, CONTROL METHOD, AND COMPUTER READABLE STORAGE MEDIUM

• US 20140300199A1
• Filed: 04/03/2014
• Published: 10/09/2014
• Est. Priority Date: 04/04/2013
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: SHICHINO, Takahiro, EGUCHI, Tadashi
• Granted Patent: US 9,954,582 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• 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: H03F 1/0244 Stepped control
• CPC Class Codes: H03F 3/217 Class D power amplifiers; Switching amplifiers
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A power transmitting apparatus that performs power transmission to a power receiving apparatus includes an amplifier including a switching element, receives a load power amount from the power receiving apparatus, detects a value for evaluating the efficiency of the amplifier, and based on the load power amount and the detected value for evaluating the efficiency, increases or reduces a voltage that is to be supplied to the amplifier.

Claims

1. A power transmitting apparatus that performs power transmission to a power receiving apparatus, the power transmission apparatus comprising:

an amplifier that includes a switching element;

a detection unit configured to detect a value for evaluating the efficiency of the amplifier; and

a power control unit configured to increase or reduce a voltage supplied to the amplifier based on the value for evaluating the efficiency that was detected by the detection unit.

2. The power transmitting apparatus according to claim 1,

wherein the value for evaluating the efficiency is based on an output waveform from the switching element in the amplifier up to when the switching element transitions from an off state to an on state.

3. The power transmitting apparatus according to claim 1,

wherein the value for evaluating the efficiency is a voltage value output by the switching element in the amplifier at a time when the switching element transitions from the off state to the on state.

4. The power transmitting apparatus according to claim 1,

wherein the value for evaluating the efficiency is a current value output by the switching element in the amplifier at a time when the switching element transitions from the off state to the on state.

5. The power transmitting apparatus according to claim 1,

wherein the value for evaluating the efficiency is the local maximum value among the voltage values output by the switching element in the amplifier up to when the switching element transitions from the off state to the on state, or the time at which the local maximum value was output.

6. The power transmitting apparatus according to claim 1,

wherein the value for evaluating the efficiency is an input impedance of the amplifier up to when the switching element in the amplifier transitions from the off state to the on state.

7. The power transmitting apparatus according to claim 1, further comprising:

a determination unit configured to determine the voltage that is to be supplied to the amplifier based on a result detected by the detection unit,

wherein the power control unit increases or reduces the voltage that is to be supplied to the amplifier in accordance with the voltage determined by the determination unit.

8. The power transmitting apparatus according to claim 1, further comprising:

a matching unit configured to remove the influence of variation in the distance between the power transmitting apparatus and the power receiving apparatus,

wherein after the influence is removed by the matching unit, the detection unit detects the value for evaluating the efficiency of the amplifier.

9. The power transmitting apparatus according to claim 1, further comprising:

a communication unit configured to communicate with the power receiving apparatus,

wherein the power control unit, based on the power consumption of the load in the power receiving apparatus received by the communication unit, increases or reduces the voltage that is to be supplied to the amplifier.

10. A control method of a power transmitting apparatus that performs power transmission to a power receiving apparatus having an amplifier that includes a switching element, comprising:

detecting a value for evaluating the efficiency of the amplifier;

increasing or reducing a voltage supplied to the amplifier based on the value for evaluating the efficiency that was detected in the detecting step

11. A non-transitory computer readable storage medium storing a program that causes a computer to execute a control method of a power transmitting apparatus that performs power transmission to a power receiving apparatus having an amplifier that includes a switching element, the method comprising:

detecting a value for evaluating the efficiency of the amplifier;

increasing or reducing a voltage supplied to the amplifier based on the value for evaluating the efficiency that was detected in the detecting step.