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:
Oct. 16, 2024
Murata Manufacturing Co., Ltd., Nagaokakyo, JP;
Chuipong Liu, Hong Kong, CN;
Siuwai Leung, Hong Kong, CN;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A switching power supply device includes a passive EMI filter including capacitors coupled to an output terminal of the passive EMI filter and a ground, a first soft switching converter coupled to the passive EMI filter output terminal and the ground, including a primary side switching circuit coupled to the passive EMI filter output terminal, an isolation transformer including a primary winding coupled to the primary side switching circuit and a secondary winding, and a rectification circuit coupled to the secondary winding and an output terminal of the switching power supply device, and including a rectifier, and a first common-mode noise reduction path coupled between a node coupling the capacitor and the passive EMI filter output terminal and a node coupling a homonymous end of the secondary winding and the rectifier. The first common-mode noise reduction path includes an impedance.