Non-contact power feeding apparatus

• US 9,755,461 B2
• Filed: 07/12/2013
• Issued: 09/05/2017
• Est. Priority Date: 07/30/2012
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Kai, Toshihiro, Kraisorn, Throngnumchai, Yamauchi, Yuuya, Minagawa, Yuusuke
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): DHILLON, JAGDEEP S
• Application Number:
  US14/417,991
• Publication Number:
  US 20150171667A1
• Time in Patent Office: 1,516 Days
• Field of Search: 307104, 307149, 307109, 307 82, 307 80, 330296, 330297, 330295, 313309, 600561
• CPC Class Codes: G01R 27/32 in circuits having distributed constants , e.g. having very long conductors or involving high frequencies
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

There are provided with: a secondary winding 20 to which an electric power is supplied in a non-contact manner from a primary winding 10 by an alternating-current power source; a first circuit section 21 connected in parallel to the secondary winding 20; and a second circuit section 22 connected in series to a parallel circuit of the secondary winding 20 and the first circuit section 21. An impedance of the first circuit section 21 is larger than an impedance of the second circuit section.

Claims

1. A non-contact power feeding apparatus, comprising:

a secondary winding to which an electric power is supplied from a primary winding in a non-contact manner by an alternating-current power source;

a first circuit section connected in parallel to the secondary winding and configured to form a first resonant circuit with the secondary winding; and

a second circuit section connected in series to a parallel circuit of the secondary winding and the first circuit section and configured to form a second resonant circuit with the secondary winding different from the first resonant circuit, wherein

the second circuit section includes a battery,

a magnitude of an impedance of the first circuit section is larger than a magnitude of an impedance of the second circuit section,

wherein the first circuit section includes a first capacitor, and

the second circuit section includes a second capacitor, and

wherein

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

a frequency-impedance characteristic of Z₁ has a minimum value or a maximum value in the vicinity of a frequency of a fundamental wave component of the alternating-current power source, and

a frequency-impedance characteristic of Z₂ has the frequency of the fundamental wave component between a frequency which is nearest to the frequency of the fundamental wave component and at which a minimum value is given and a frequency which is nearest to a frequency of the fundamental wave component and at which a maximum value is given,

where

Z₁ denotes an impedance of only a primary side seen from an output side of the alternating-current power source when a coupling coefficient between the primary winding and the secondary winding is zero, and

Z₂ denotes an impedance of only a secondary side seen from a load side connected to the secondary winding when a coupling coefficient between the primary winding and the secondary winding is zero.

3. The non-contact power feeding apparatus according to claim 2, further comprising:

a third capacitor connected in series or in parallel to the primary winding,

wherein

the first circuit section has a series circuit of the first capacitor and a coil, and

the second circuit section has the second capacitor, and

wherein

a frequency at which a minimum value or a maximum value of the Z₁ is given satisfies;

4. The non-contact power feeding apparatus according to claim 2, wherein

a magnitude of the Z₂ with respect to a resonant frequency of the first resonant circuit of the secondary winding and the first circuit section is set in accordance with a frequency which is the second nearest to the frequency of the fundamental wave component among two or more frequencies at which a minimum value is given in the impedance characteristic of the Z₂.

5. The non-contact power feeding apparatus according to claim 1, wherein

the first circuit section has a series circuit of the first capacitor and a coil, and

the second circuit section has the second capacitor.

6. The non-contact power feeding apparatus according to claim 1, wherein

the first circuit section has a series circuit of the first capacitor and a resistor, and

the second circuit section has the second capacitor.