Title :
PCB integrated inductors for low power DC/DC converter
Author :
Ludwig, Matthias ; Duffy, Maeve ; Donnell, Terence Ó ; Mathuna, Cian Ó
Author_Institution :
PEI Technol., Nat. Microelectron. Res. Centre, Cork, Ireland
Abstract :
This paper discusses the use of PCB integrated inductors for low power DC/DC buck converters. Coreless, magnetic plates and closed core structures are compared in terms of achievable inductance, power handling and efficiency in a footprint of 10 × 10 mm2. Analytic and FEM methods are applied and typical current waveforms encountered in a buck converter are included. The magnetic layers consist of electroplated NiFe, so that the process is fully compatible with standard PCB process. A 4.7 μH PCB integrated inductor with DC current handling of up to 500 mA is presented. This inductor is employed in a 1.5 W buck converter using a commercial available IC. The footprint of the entire converter measures 10 × 10 mm2 and is built on top of the integrated inductor to demonstrate the concept of integrated passives in power electronic circuits to achieve ultra flat and compact converter design
Keywords :
DC-DC power convertors; finite element analysis; inductors; power integrated circuits; printed circuits; windings; 1.5 W; 10 mm; FEM methods; PCB integrated inductors; buck converter; closed core structures; coreless magnetic plates; current waveforms; efficiency; electroplated NiFe magnetic layers; low-power DC/DC converter; power IC; power handling; ultra flat compact power converter design; Buck converters; Circuits; DC-DC power converters; Fabrication; Inductance; Magnetic cores; Performance analysis; Silicon; Thin film inductors; Transformer cores;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2002. APEC 2002. Seventeenth Annual IEEE
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-7404-5
DOI :
10.1109/APEC.2002.989265
