Invention Grant
- Patent Title: Multilayer inductor and power converter comprising it
- Patent Title (中): 多层电感和功率转换器组成
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Application No.: US12810351Application Date: 2008-12-25
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Publication No.: US08436708B2Publication Date: 2013-05-07
- Inventor: Takeshi Tachibana , Satoru Tanaka
- Applicant: Takeshi Tachibana , Satoru Tanaka
- Applicant Address: JP Tokyo
- Assignee: Hitachi Metals, Ltd.
- Current Assignee: Hitachi Metals, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2007-332358 20071225
- International Application: PCT/JP2008/073621 WO 20081225
- International Announcement: WO2009/081984 WO 20090702
- Main IPC: H01F5/00
- IPC: H01F5/00 ; H01F27/28

Abstract:
A multilayer inductor comprising a coil embedded in a magnetic portion, and a magnetic gap formed by a non-magnetic portion in part of a magnetic path, the magnetic portion being made of Ni ferrite, whose relative temperature coefficient αμir of initial permeability at a frequency of 1 MHz is more than +10 ppm/° C. and +40 ppm/° C. or less between −40° C. and +80° C., the non-magnetic portion being made of Zn ferrite containing more Zn than in the magnetic portion and having a Curie temperature Tc of −50° C. or lower, and the Zn content changing continuously in boundary regions between the non-magnetic portion and the magnetic portion, whereby the thickness of the magnetic gap changes with the temperature.
Public/Granted literature
- US20100283447A1 MULTILAYER INDUCTOR AND POWER CONVERTER COMPRISING IT Public/Granted day:2010-11-11
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