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:
Jul. 07, 2026
Filed:
Jan. 05, 2024
Murata Manufacturing Co., Ltd., Kyoto, JP;
Xiaowu Sun, Milford, NH (US);
Gregory Szczeszynski, Nashua, NH (US);
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
Circuits and methods for providing a constant, limited power to a transistor of a power converter during a startup period while achieving high efficiency and high performance. In a first embodiment, a driver circuit includes a variable reference current circuit configured to provide a first current inversely proportional to a voltage across the transistor, and a coupled power limiting circuit that enables a second current through the transistor that is proportional to the first current. In a second embodiment, a driver circuit includes a variable reference current circuit configured to provide a first current that increases over a time period of operation as a function of a voltage at a node of the power converter, and a coupled power limiting circuit that enables a second current through the transistor that is proportional to the first current and inversely proportional to a voltage across the transistor.