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US 6,185,113 B2Granted
Transformer and switching regulator that prevents winding's caused by magnetic field leakage
AssigneeFujitsu Limited
InventorsYuichi Sato, Tokio Muta, Kazuo Shimada
Life of this patent
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Abstract
A transformer and switching regulator that prevents winding's breakdown caused by the leakage magnetic field. A transformer has a core having an air gap, and a winding wound around the core. The turn density of the winding is made least on the air gap. The switching regulator has such a transformer.
Claims9
A transformer comprising:
- a core having an air gap;
- and
- a winding wound around said core, a turn density of said winding being made least on the air gap.
A core for use with a transformer, said core comprising:
- a first core member;
- and
- a second core member coupled to said first core member, an air gap formed between said first and second member being offset from a center of said core,
- wherein said fist and second core members have respectively a sectionally E shape, and said core is an EE core.
1 more element
A switching regulator comprising:
- a switch;
- a transformer, connected to said switch, which comprises a core having an air gap, and a winding wound around said core, a turn density of said winding being made least on the air gap;
- and
- a rectifier connected to said transformer.
1 more element
A transformer manufacturing method comprising the steps of:
- forming a core having an air gap by connecting first and second core member to each other;
- connecting said core to a bobbin;
- and
- forming a winding on said bobbin so that a turn density becomes least on the air gap.
1 more element
Dependencies are inferred from the claim text.