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:
Aug. 19, 2025
Filed:
Mar. 22, 2023
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 unit includes a power conversion circuit, a control circuit, a class-Y capacitor, and a common-mode choke coil. The control circuit has a direct electrical connection to the power conversion circuit. The class-Y capacitor is connected to the power conversion circuit on its side of a direct-current power supply, and is connected to the ground potential. The common-mode choke coil is connected to the control circuit on its side of a direct-current power supply. A noise balancing circuit is formed of a closed circuit including the power conversion circuit, the control circuit, the class-Y capacitor, and the common-mode choke coil. The noise balancing circuit causes common-mode currents to be confined and canceled out each other. The common-mode currents serve as switching noise generated in multiple parts of the closed circuit due to a switching operation of power-conversion switching devices.