STACKED INDUCTOR AND POWER CONVERTER USING THE STACKED INDUCTOR

摘要

Disclosed is a stacked inductor comprising a coil buried in a magnetic material part and a magnetic gap comprising a non-magnetic material part and provided in a part of a magnetic path. The stacked inductor is characterized in that the magnetic material part is formed of a Ni-base ferrite which has a relative temperature coefficient (aµir) (frequency 1 MHz) of an initial magnetic permeability of more than +10 ppm/°C and not more than +40 ppm/°C as measured between -40°C and +80°C, the non-magnetic material part is formed of a Zn-base ferrite that contains a larger amount of Zn than the magnetic material part and has a Curie temperature (Tc) of -50°C or below, and the Zn content continuously changes in the boundary region between the non-magnetic material part and the magnetic material part, whereby the size of the gap varies depending upon the temperature.