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:
Sep. 22, 2026
Filed:
Sep. 12, 2024
Murata Manufacturing Co., Ltd., Kyoto-fu, JP;
Hiroyuki Takatsuji, Nagaokakyo, JP;
Tatsuya Hosotani, Nagaokakyo, JP;
Murata Manufacturing Co., Ltd., Kyoto-fu, JP;
Abstract
A switching power supply device includes a power conversion circuit including input and output capacitors, a switching element, and an inductor, a common-mode choke coil between a DC power supply and the power conversion circuit, and a multilayer circuit board on which the power conversion circuit and the common-mode choke coil are mounted. The common-mode choke coil includes a first winding having one end connected to a low-potential side of the DC power supply via a first reference potential wiring pattern P− and another end connected to a low-potential side of a load via a second reference potential wiring pattern L−, and a second winding of which one end is connected to a high-potential side of the DC power supply via a DC positive potential wiring pattern and another end is connected to an input side of the power conversion circuit via an input positive potential wiring pattern.