SURFACE MOUNT TYPE POWER INDUCTOR

• US 20100148902A1
• Filed: 12/28/2006
• Published: 06/17/2010
• Est. Priority Date: 12/28/2005
• Status: Abandoned Application

• Current Assignee: Toda Isu Corporation
• Original Assignee: Toda Isu Corporation
• Inventors: Lee, Sang Kyung, Shin, Jae Young, Song, Byung Moo
• Application Number:
  US12/159,764
• Publication Number:
  US 20100148902A1
• Time in Patent Office: Days
• US Class Current: 336/90
• CPC Class Codes: H01F 17/045 with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
• CPC Class Codes: H01F 2017/048 with encapsulating core, e.g. made of resin and magnetic powder
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 3/10 Composite arrangements of magnetic circuits

Abstract

Disclosed herein is a surface mount type power inductor which has an outer magnetic capsule integrated with a coil-wound inner core, and which thus has no air gap between the outer magnetic capsule and the inner core, and can maintain a large inductance L in a high current condition. In the inductor, a coil is wound a predetermined number of turns around the inner core formed from ferrite or magnetic metal. An outer magnetic capsule, molded from a magnetic powder, an insulation filler, a binder, and a lubricant, is provided to cover the inner core and the coil.

Claims

1. A surface mount type power inductor, comprising:

an inner core, made from ferrite or magnetic metal, having a form selected from among an I type, a T type or a drum type,

a coil wound a predetermined number of turns around the inner core,

external electrodes communicating respectively with opposite ends of the coil, and

an external magnetic capsule, formed from a magnetic powder, an insulation filler, a binder, and a lubricant through a molding process, covering the inner core and the coil, said magnetic powder being selected from a group consisting of iron powder, permalloy powder, sendust powder, amorphous alloy powder, and ferrite powder.