Wireless power transmission apparatus for performing non-contact transmission by electromagnetic induction

• US 10,367,379 B2
• Filed: 09/05/2017
• Issued: 07/30/2019
• Est. Priority Date: 04/22/2013
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Matsumoto, Hiromu, Kanno, Hiroshi
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Pham, Duc M
• Application Number:
  US15/695,126
• Publication Number:
  US 20170366047A1
• Time in Patent Office: 693 Days
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

A wireless power transmission apparatus is provided for performing non-contact transmission of power by electromagnetic induction, and includes a power transmitter performing frequency conversion; a power transmitting antenna connected to the power transmitter; and a first resonance capacitor connected between the power transmitter and the power transmitting antenna, and resonating with the power transmitting antenna to pass the power transmission frequency of the power transmitter. The wireless power transmission apparatus includes a power receiving antenna arranged to oppose the power transmitting antenna; a power receiver connected to the power receiving antenna, and performing rectification and smoothing; and a second resonance capacitor connected between the power receiving antenna and the power receiver, and resonating with the power receiving antenna to pass the power transmission frequency of the power transmitter. The wireless power transmission apparatus includes a filter connected between the second resonance capacitor and the power receiver, and reflecting higher harmonics generated by the power receiver.

Claims

1. A power receiver apparatus for use in a wireless power transmission apparatus for performing non-contact transmission of power from a power transmitter apparatus including a power transmitting antenna to the power receiver apparatus, the power receiver apparatus comprising:

a power receiving antenna arranged to oppose the power transmitting antenna;

a power receiver connected to the power receiving antenna, the power receiver performing rectification and smoothing;

a first resonance capacitor connected between the power receiving antenna and the power receiver, the first resonance capacitor resonating with the power receiving antenna so as to pass the power transmission frequency of the power transmitter; and

a filter connected between the first resonance capacitor and the power receiver, the filter reflecting higher harmonics generated by the power receiver,

wherein the filter reflects a third harmonic generated by the power receiver with an impedance of any phase of +90 degrees to +180 degrees.

2. The power receiver apparatus as claimed in claim 1,

wherein the non-contact transmission is performed by electromagnetic induction.

3. The power receiver apparatus as claimed in claim 1,

wherein the power transmitter apparatus comprises:

a power transmitter configured to perform frequency conversion, the power transmitter being connected to the power transmitting antenna; and

a second resonance capacitor connected between the power transmitter and the power transmitting antenna, the second resonance capacitor resonating with the power transmitting antenna so as to pass the power transmission frequency of the power transmitter.

4. The power receiver apparatus as claimed in claim 3,

wherein the first resonance capacitor is connected in parallel with the power receiving antenna, and

wherein the second resonance capacitor is connected in series with the power transmitting antenna.

5. The power receiver apparatus as claimed in claim 1,

wherein the filter is provided by connecting a band stop filter, which is configured by parallel connection of an inductor and a capacitor, in series between the first resonance capacitor and the power receiver.

6. The power receiver apparatus as claimed in claim 1,

wherein the filter is able to change a phase of impedance with respect to a third harmonic generated by the power receiver.

7. The power receiver apparatus as claimed in claim 1,

wherein the filter is provided by connecting a band stop filter, which is configured by parallel connection of an inductor and a capacitor having a variable capacitance, in series between the first resonance capacitor and the power receiver.

8. A power transmitter apparatus for use in a wireless power transmission apparatus for performing non-contact transmission of power from the power transmitter apparatus to a power receiver apparatus including a power receiver and a filter, the power transmitter apparatus comprising:

a power transmitter configured to perform frequency conversion;

a power transmitting antenna connected to the power transmitter and arranged to oppose the power receiving antenna connected to the filter for reflecting a third harmonic generated by the power receiver with an impedance of any phase of +90 degrees to +180 degrees; and

a first resonance capacitor connected between the power transmitter and the power transmitting antenna, the first resonance capacitor resonating with the power transmitting antenna so as to pass the power transmission frequency of the power transmitter.

9. The power transmitter apparatus as claimed in claim 8,

wherein the non-contact transmission is performed by electromagnetic induction.

10. The power transmitter apparatus as claimed in claim 8,

wherein the power receiver apparatus comprises:

a power receiving antenna arranged to oppose the power transmitting antenna, and the power receiving antenna connected to the power receiver for perming rectification and smoothing; and

a second resonance capacitor connected between the power receiving antenna and the power receiver, the second resonance capacitor resonating with the power receiving antenna so as to pass the power transmission frequency of the power transmitter,

wherein the filter is connected between the second resonance capacitor and the power receiver.

11. The power transmitter apparatus as claimed in claim 10,

wherein the first resonance capacitor is connected in series with the power transmitting antenna, and

wherein the second resonance capacitor is connected in parallel with the power receiving antenna.

12. The power transmitter apparatus as claimed in claim 10,

wherein the filter is provided by connecting a band stop filter, which is configured by parallel connection of an inductor and a capacitor, in series between the second resonance capacitor and the power receiver.

13. The power transmitter apparatus as claimed in claim 8,

wherein the filter is able to change a phase of impedance with respect to a third harmonic generated by the power receiver.

14. The power transmitter apparatus as claimed in claim 10,

wherein the filter is provided by connecting a band stop filter, which is configured by parallel connection of an inductor and a capacitor having a variable capacitance, in series between the second resonance capacitor and the power receiver.