Reactor for circuit containing semiconductor device

Details

Inventors: Hirose, Yorio; Sakamizu, Yasunobu;
Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (Kawasaki, JP)
Primary Examiner: Salce; Patrick R.
Assistant Examiner: Jones; Judson H.
Attorney, Agent or Firm: Cushman, Darby & Cushman

Apparatus and method for effectively decreasing current spike, ringing, and electromagnetic noise in a circuit containing a semiconductor device when a voltage applied to the semiconductor is inverted. The core of the reactor is made of an amorphous magnetic alloy having a magnetic flux density of not less than 6 kilogauss at an external magnetic field of 1 oersted, a coercive force of not more than 0.5 oersted, and a squareness ratio of not less than 0.8 when a frequency is set to be 100 kilohertz. The reactor includes the core having a through hole and conductor wound around the core through the through hole. The core is insulated from the conductor.

DETAILED DESCRIPTION It is, therefore, an object of the present invention to provide an apparatus and a method for effectively preventing current spike, ringing and electromagnetic noise in a circuit containing a semiconductor device by the use of a reactor.
The core of the reactor of the present invention is made of an amorphous magnetic alloy which has B.
sub.
1 (a magnetic flux density in a magnetic field of 1 Oe) of 6 kilogauss or more, a coercive force (Hc) of 0.
5 Oe or less, and a squareness ratio (Br/B.
sub.
1) (where Br is the residual magnetic flux density) of 0.
8 or more when the frequency is set to be 100 kHz.
The present invention provides for apparatus and a method of using a reactor for a circuit containing a semiconductor device, the reactor including: a core which has a through hole and which is made of an amorphous magnetic alloy which has B.
sub.
1 of 6 kilogauss or more, a coercive force of 0.
5 Oe or less and a squareness ratio of 0.
8 or more at a frequency of 100 kHz; and a conductor wound around the core through the through hole.
The core is insulated from the conductor.
According to the present invention, a current spike, ringing, and electromagnetic noise can be effectively prevented.
The apparatus and method of the present invention can be effectively used even in a high frequency region.

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