The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 2018
Filed:
May. 22, 2017
Applicant:
Murata Manufacturing Co., Ltd., Kyoto-fu, JP;
Inventor:
Hiroyuki Takatsuji, Nagaokakyo, JP;
Assignee:
Murata Manufacturing Co., Ltd., Kyoto-fu, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01F 27/42 (2006.01); H02M 3/00 (2006.01); H03H 7/09 (2006.01); H01F 27/06 (2006.01); H01F 17/04 (2006.01); H01F 27/29 (2006.01); H01F 27/40 (2006.01); H02M 1/44 (2007.01); H02M 3/156 (2006.01); H01F 17/00 (2006.01);
U.S. Cl.
CPC ...
H01F 27/42 (2013.01); H01F 17/04 (2013.01); H01F 27/06 (2013.01); H01F 27/292 (2013.01); H01F 27/40 (2013.01); H02M 1/44 (2013.01); H02M 3/00 (2013.01); H02M 3/156 (2013.01); H03H 7/09 (2013.01); H01F 2017/0093 (2013.01); H01F 2027/065 (2013.01); Y02B 70/1425 (2013.01);
Abstract
A power supply circuit includes a DC-DC converter and a choke coil. The choke coil includes a pair of coils wound in mutually opposite directions, and the coils are connected between a DC power source and the DC-DC converter. In the choke coil, a self-resonating frequency in a common mode is higher than a self-resonating frequency in a normal mode. In the choke coil, a normal mode impedance at the highest frequency in an AM band is higher than a common mode impedance at the lowest frequency in an FM band.