Noise cancellation resonator

• US 9,509,270 B2
• Filed: 01/29/2014
• Issued: 11/29/2016
• Est. Priority Date: 01/31/2013
• Status: Active Grant

• Current Assignee: Equos Research Co., Ltd. (Aisin Corp.)
• Original Assignee: Equos Research Co., Ltd. (Aisin Corp.)
• Inventors: Yamakawa, Hiroyuki, Sato, Kenichiro
• Primary Examiner(s): TAKAOKA, DEAN O
• Application Number:
  US14/436,620
• Publication Number:
  US 20160173051A1
• Time in Patent Office: 1,035 Days
• Field of Search: 333/24.R, 333/176, 333/12
• US Class Current: 1/1
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H03H 2007/013 Notch or bandstop filters
• CPC Class Codes: H03H 7/01 Frequency selective two-port networks
• CPC Class Codes: H03H 7/09 Filters comprising mutual inductance

Abstract

In order to provide a noise cancellation resonator that is highly effective in reducing noise, a noise cancellation resonator of the present invention is characterized by including: a noise cancellation resonator coil with an inductance component of L_n; and a noise cancellation resonator capacitor with a capacitance component of C_n, wherein the noise cancellation resonator has a resonance frequency that is calculated by adding a shift frequency that is determined based on a degree of coupling between a main resonator coil and the noise cancellation resonator coil, to a predetermined frequency of an electromagnetic field generated by a main resonator that is a source of noise and includes the main resonator coil.

Claims

1. A noise cancellation resonator comprising:

a noise cancellation resonator coil with an inductance component of L_n; and

a noise cancellation resonator capacitor with a capacitance component of C_n, wherein

the noise cancellation resonator has a resonance frequency (f_m+f_s) that is calculated by adding a shift frequency (f_s), which is determined based on a degree of coupling between a main resonator coil and the noise cancellation resonator coil, to a predetermined frequency (f_m) of an electromagnetic field generated by a main resonator that is a source of noise and includes the main resonator coil.

2. The noise cancellation resonator according to claim 1, wherein

the predetermined frequency is a frequency of a fundamental wave of the electromagnetic field generated by the main resonator.

3. The noise cancellation resonator according to claim 1, wherein

the predetermined frequency is a frequency of a higher harmonic wave of the electromagnetic field generated by the main resonator.

4. The noise cancellation resonator according to claim 3, wherein

the higher harmonic wave is an odd-multiple wave.

5. The noise cancellation resonator according to claim 3, wherein

the higher harmonic wave is an even-multiple wave.

6. The noise cancellation resonator according to claim 1, wherein

if a mutual inductance component between the main resonator coil and the noise cancellation resonator coil is represented by L_m, the shift frequency is:

7. The noise cancellation resonator according to claim 1, wherein

the main resonator is an antenna that is used to transmit power.

8. The noise cancellation resonator according to claim 1, wherein

a Q-value is 50 or more.