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US 10,381,154 B2Granted
High-voltage and high-frequency insulation transformer
AssigneeFuji Electric Co., Ltd.
InventorsTakeshi Watanabe, Kenji Okamoto, Tatsuya Ganbe
Life of this patent
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Abstract
A transformer is configured to include a pair of cores that each have an inner leg, wherein a primary winding that is wound around a bobbin having a hollow into which the inner legs of the cores are inserted and that is hermetically sealed with resin material, and a secondary winding that has a hollow into which the inner legs of the cores are inserted and that is constituted of a conductor formed by die-cutting a metal plate into a ring are dispersedly arranged over the inner legs of the cores.
Claims15
A high-voltage and high-frequency insulation transformer, comprising:
- cores that each include legs that configure a magnetic path;
- a plurality of windings that are wound and provided in the legs;
- and
- a bobbin that is formed of resin material having a low dielectric constant and high insulating properties,
- wherein from among the plurality of windings, a winding to which a high voltage is to be applied is wound around the bobbin and is hermetically sealed with insulating resin, so as to be integrally formed with the bobbin, and
- wherein the insulating resin has a thickness that satisfies a predetermined partial discharge inception voltage in an air space between one of the cores and the winding to which the high voltage is applied such that the thickness of the insulating resin is obtained for a two-layer dielectric model by Formula (1) below:
- Vpd={d1+(d2/εr)}·Vp/d1 (1),
- where Vpd represents the predetermined partial discharge inception voltage [Vrms], Vp represents a Paschen voltage [Vrms], d1 represents a thickness of the air space, d2 represents a thickness of the resin material, and εr represents a relative dielectric constant of the resin material.
5 more elements
A high-voltage and high-frequency insulation transformer, comprising:
- cores that each include legs that configure a magnetic path;
- a plurality of windings that are wound and provided in the legs;
- and
- a bobbin that is formed of resin material having a low dielectric constant and high insulating properties, that includes a cylindrical portion formed at a center of the bobbin and flanges that extend from the cylindrical portion,
- wherein from among the plurality of windings, a winding to which a high voltage is to be applied is wound around the bobbin and is hermetically sealed with insulating resin, so as to be integrally formed with the bobbin,
- wherein the insulating resin has a thickness that satisfies a predetermined partial discharge inception voltage in an air space between one of the cores and the winding to which the high voltage is applied such that the thickness of the insulating resin is obtained for a two-layer dielectric model by Formula (1) below:
- Vpd={d1+(d2/εr)}·Vp/d1 (1),
- where Vpd represents the predetermined partial discharge inception voltage [Vrms], Vp represents a Paschen voltage [Vrms], d1 represents a thickness of the air space, d2 represents a thickness of the resin material, and εr represents a relative dielectric constant of the resin material,
- wherein said winding to which a high voltage is to be applied is a primary winding and is wound around the cylindrical portion of the bobbin and is hermetically sealed with the insulating resin in a space formed by the cylindrical portion and the flanges, and
- wherein, from among the plurality of windings, a secondary winding includes one or more die-cut ring-shaped metal conductors.
7 more elements
A high-voltage and high-frequency insulation transformer, comprising:
- cores that each include legs that configure a magnetic path;
- a plurality of windings that are wound and provided in the legs;
- and
- a bobbin that is formed of resin material having a low dielectric constant and high insulating properties,
- wherein from among the plurality of windings, a winding to which a high voltage is to be applied is a primary winding and is wound around the bobbin and is hermetically sealed with insulating resin, so as to be integrally formed with the bobbin, and
- wherein the insulating resin with which the winding is sealed hermetically includes a material identical to the resin material of which the bobbin is formed and comprises a thermosetting resin having a low dielectric constant,
- wherein the insulating resin has a thickness that satisfies a predetermined partial discharge inception voltage in an air space between one of the cores and the winding to which the high voltage is applied such that the thickness of the insulating resin is obtained for a two-layer dielectric model by Formula (1) below:
- Vpd={d1+(d2/εr)}·Vp/d1 (1),
- where Vpd represents the predetermined partial discharge inception voltage [Vrms], Vp represents a Paschen voltage [Vrms], d1 represents a thickness of the air space, d2 represents a thickness of the resin material, and εr represents a relative dielectric constant of the resin material, and
- wherein, from among the plurality of windings, another winding to which a low voltage is to be applied includes one or more die-cut ring-shaped metal conductors.
7 more elements
Dependencies are inferred from the claim text.