US 6,982,623 B2 | ||
Step-up transformer for magnetron driving | ||
Keiichi Satou, Daito (Japan); Shinichi Sakai, Nara (Japan); Kenji Yasui, Yamatokoriyama (Japan); and Haruo Suenaga, Katano (Japan) | ||
Assigned to Matsushita Electric Industrial Co., Ltd., Osaka (Japan); and Nifco Inc., Kanagawa (Japan) | ||
Filed on Sep. 16, 2003, as Appl. No. 10/663,146. | ||
Claims priority of application No. P. 2002-270133 (JP), filed on Sep. 17, 2002. | ||
Prior Publication US 2004/0108932 A1, Jun. 10, 2004 | ||
Int. Cl. H01F 17/06 (2006.01) |
U.S. Cl. 336—178 | 6 Claims |
1. A step-up transformer for magnetron driving, comprising:
a magnetic circuit, including a middle core section, an outer core section and a coupling core section for coupling the middle
core section and the outer core section, formed by an arrangement of two ferrite cores opposed to each other with a gap interposed
therebetween, and
a primary winding and a secondary winding arranged to surround the middle core respectively,
wherein a sectional area of the middle core is increased;
a number of winds in a radial direction of the primary winding to be wound around the middle core is increased and a number
of winds in an axial direction is decreased;
a number of winds in a radial direction of the secondary winding is increased and a number of winds in an axial direction
is decreased;
the primary winding and the secondary winding are provided close to each other interposing an insulator, and
a sectional area of the outer core is set to be smaller than that of the middle core,
wherein a height of a cross section of the outer core is smaller than a height of a cross section of the middle core.
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