NON-CONTACT POWER SUPPLYING DEVICE AND NON-CONTACT POWER SUPPLYING METHOD

• US 20110316348A1
• Filed: 02/26/2010
• Published: 12/29/2011
• Est. Priority Date: 03/06/2009
• Status: Abandoned Application

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Hayami, Yasuaki, Kai, Toshihiro, Kraisorn, Throngnumchai
• Application Number:
  US13/254,320
• Publication Number:
  US 20110316348A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

A non-contact power supplying device includes a power-receiving resonating means set to have a predetermined resonant frequency; a power-feeding resonating means set to have a resonance frequency equal to the predetermined resonant frequency; an oscillating means configured to input an alternating-current power into the power-feeding resonating means; an impedance detecting means configured to detect impedance within a predetermined frequency range as viewed from a power-feeding side; and a frequency-variable means configured to set a frequency of the alternating-current power. The oscillating means is configured to supply electric power to the power-receiving resonating means by producing a resonance between the power-receiving resonating means and the power-feeding resonating means. The frequency-variable means is configured to set the frequency of the alternating-current power in accordance with a value of the impedance detected by the impedance detecting means within the predetermined frequency range.

Claims

1. A non-contact power supplying device comprising:

a power-receiving resonating section set to have a predetermined resonant frequency;

a power-feeding resonating section set to have a resonance frequency equal to the predetermined resonant frequency;

an oscillating section configured to input an alternating-current power into the power-feeding resonating section;

an impedance detecting section configured to detect impedance within a predetermined frequency range as viewed from a power-feeding side; and

a frequency-variable section configured to set a frequency of the alternating-current power,

wherein the oscillating section is configured to supply electric power to the power-receiving resonating section by producing a resonance between the power-receiving resonating section and the power-feeding resonating section,

wherein the impedance detecting section is configured to set the predetermined frequency range on the basis of a coupling state between the power-receiving resonating section and the power-feeding resonating section,

wherein the frequency-variable section is configured to set the frequency of the alternating-current power in accordance with a value of the impedance detected by the impedance detecting section within the predetermined frequency range.

4. The non-contact power supplying device according to claim 1, wherein

the impedance detecting section is configured to detect an absolute value of impedance as viewed from the power-feeding side within the predetermined frequency range,

the frequency-variable section is configured to set a frequency value causing the absolute value of impedance to become its local minimum within the predetermined frequency range, as the frequency of the alternating-current power.

5. The non-contact power supplying device according to claim 4, wherein

in a case that there are a plurality of frequency values causing the absolute value of impedance to become its local minimum, the frequency-variable section sets a frequency value closest to the predetermined resonant frequency among the plurality of frequency values, as the frequency of the alternating-current power.

6. The non-contact power supplying device according to claim 1, wherein

the impedance detecting section is configured to detect a phase of impedance as viewed from the power-feeding side within the predetermined frequency range,

the frequency-variable section is configured to set a frequency value causing the phase of impedance to become equal to 0 within the predetermined frequency range, as the frequency of the alternating-current power.

7. The non-contact power supplying device according to claim 6, wherein

in a case that there are a plurality of frequency values causing the phase of impedance to become equal to 0, the frequency-variable section sets a frequency value closest to the predetermined resonant frequency among the plurality of frequency values, as the frequency of the alternating-current power.

2. A non-contact power supplying device comprising:

a power-feeding resonating section set to have a resonance frequency equal to a resonant frequency of a power-receiving resonating section;

an oscillating section configured to input an alternating-current power into the power-feeding resonating section;

an impedance detecting section configured to detect impedance within a predetermined frequency range as viewed from a power-feeding side; and

a frequency-variable section configured to set a frequency of the alternating-current power,

wherein the oscillating section is configured to supply electric power to the power-receiving resonating section by producing a resonance between the power-receiving resonating section and the power-feeding resonating section,

wherein the impedance detecting section is configured to set the predetermined frequency range on the basis of a coupling state between the power-receiving resonating section and the power-feeding resonating section,

wherein the frequency-variable section is configured to set the frequency of the alternating-current power in accordance with a value of the impedance detected by the impedance detecting section within the predetermined frequency range.

3. A non-contact power supplying device comprising:

a power-receiving resonating section set to have a resonance frequency equal to a resonant frequency of a power-feeding resonating section;

an impedance detecting section configured to detect impedance within a predetermined frequency range as viewed from a power-feeding side; and

a frequency-variable section configured to set a frequency of alternating-current power which is inputted into the power-feeding resonating section by an oscillating section,

wherein the power-receiving resonating section is configured to receive electric power from the oscillating section by a resonance between the power-receiving resonating section and the power-feeding resonating section,

wherein the impedance detecting section is configured to set the predetermined frequency range on the basis of a coupling state between the power-receiving resonating section and the power-feeding resonating section,

wherein the frequency-variable section is configured to set the frequency of the alternating-current power in accordance with a value of the impedance detected by the impedance detecting section within the predetermined frequency range.

8. A non-contact power supplying method comprising:

a step of oscillating an alternating-current power;

a step of feeding an electric power by generating a magnetic field based on the alternating-current power;

a step of receiving the electric power by use of electromagnetic resonance in the magnetic field;

a step of setting a predetermined frequency range on the basis of a coupling state between a power-receiving side and a power-feeding side;

a step of detecting an impedance within the predetermined frequency range as viewed from the power-feeding side; and

a step of setting a frequency of the alternating-current power in accordance with a value of the detected impedance.