Signal transmission insulative device and power semiconductor module
First Claim
Patent Images
1. A signal transmission insulating device comprising:
- a first coil;
a second coil opposing the first coil to form a transformer together with the first coil;
a first insulating film provided between the opposing first coil and second coil and made of a first dielectric material;
a second insulating film including a first film provided between the first insulating film and a surface in contact with a second principal surface of the first coil opposite to a first principal surface of the first coil which first principal surface faces the second coil, the first film filling and covering the first coil, the second insulating film including a second film provided on the surface in contact with the second principal surface and adjacently to the first film, the second insulating film being made of a second dielectric material having a lower resistivity than the first dielectric material; and
a third insulating film including a third film provided between the first insulating film and a surface in contact with a third principal surface of the second coil which third principal surface faces the first coil, and a fourth film provided on the surface in contact with the third principal surface and adjacently to the third film, the fourth film filling and covering the second coil, the third insulating film being made of a third dielectric material having a lower resistivity than the first dielectric material.
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Abstract
A signal transmission insulating device includes: a first coil; a second coil opposing the first coil to form a transformer together with the first coil; a first insulating film provided between the opposing first coil and second coil and made of a first dielectric material; a second insulating film surrounding the first coil and made of a second dielectric material having a lower resistivity or a higher permittivity than the first dielectric material; and a third insulating film surrounding the second coil and made of a third dielectric material having a lower resistivity or a higher permittivity than the first dielectric material.
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Citations
11 Claims
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1. A signal transmission insulating device comprising:
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a first coil; a second coil opposing the first coil to form a transformer together with the first coil; a first insulating film provided between the opposing first coil and second coil and made of a first dielectric material; a second insulating film including a first film provided between the first insulating film and a surface in contact with a second principal surface of the first coil opposite to a first principal surface of the first coil which first principal surface faces the second coil, the first film filling and covering the first coil, the second insulating film including a second film provided on the surface in contact with the second principal surface and adjacently to the first film, the second insulating film being made of a second dielectric material having a lower resistivity than the first dielectric material; and a third insulating film including a third film provided between the first insulating film and a surface in contact with a third principal surface of the second coil which third principal surface faces the first coil, and a fourth film provided on the surface in contact with the third principal surface and adjacently to the third film, the fourth film filling and covering the second coil, the third insulating film being made of a third dielectric material having a lower resistivity than the first dielectric material. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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2. A signal transmission insulating device comprising:
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a first coil; a second coil opposing the first coil to form a transformer together with the first coil; a first insulating film provided between the opposing first coil and second coil and made of a first dielectric material; a second insulating film including a first film provided between the first insulating film and a surface in contact with a second principal surface of the first coil opposite to a first principal surface of the first coil which first principal surface faces the second coil, the first film filling and covering the first coil, the second insulating film including a second film provided on the surface in contact with the second principal surface and adjacently to the first film, the second insulating film being made of a second dielectric material having a higher permittivity than the first dielectric material; and a third insulating film including a third film provided between the first insulating film and a surface in contact with a third principal surface of the second coil which third principal surface faces the first coil, and a fourth film provided on the surface in contact with the third principal surface and adjacently to the third film, the fourth film filling and covering the second coil, the third insulating film being made of a third dielectric material having a higher permittivity than the first dielectric material.
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3. A signal transmission insulating device comprising:
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a first coil; a second coil opposing the first coil to form a transformer together with the first coil; a first insulating film provided between the opposing first coil and second coil and made of a first dielectric material; a second insulating film including a first film provided between the first insulating film and a surface in contact with a second principal surface of the first coil opposite to a first principal surface of the first coil which first principal surface faces the second coil, the first film filling and covering the first coil, the second insulating film including a second film provided on the surface in contact with the second principal surface and adjacently to the first film, the second insulating film being made of a second dielectric material having a lower resistivity than the first dielectric material; and a third insulating film including a third film provided between the first insulating film and a surface in contact with a third principal surface of the second coil which third principal surface faces the first coil, and a fourth film provided on the surface in contact with the third principal surface and adjacently to the third film, the fourth film filling and covering the second coil, the third insulating film being made of a third dielectric material having a lower resistivity than the first dielectric material, wherein a surface, at the first insulating film side, of the first film which surface is adjacent to the first insulating film is formed to be flat, and a surface of the fourth film which surface is opposite to a surface of the fourth film which surface is in contact with the third film is formed to be flat.
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4. A signal transmission insulating device comprising:
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a first coil; a second coil opposing the first coil to form a transformer together with the first coil; a first insulating film provided between the opposing first coil and second coil and made of a first dielectric material; a second insulating film including a first film provided between the first insulating film and a surface in contact with a second principal surface of the first coil opposite to a first principal surface of the first coil which first principal surface faces the second coil, the first film filling and covering the first coil, the second insulating film including a second film provided on the surface in contact with the second principal surface and adjacently to the first film, the second insulating film being made of a second dielectric material having a higher permittivity than the first dielectric material; and a third insulating film including a third film provided between the first insulating film and a surface in contact with a third principal surface of the second coil which third principal surface faces the first coil, and a fourth film provided on the surface in contact with the third principal surface and adjacently to the third film, the fourth film filling and covering the second coil, the third insulating film being made of a third dielectric material having a higher permittivity than the first dielectric material, wherein a surface, at the first insulating film side, of the first film which surface is adjacent to the first insulating film is formed to be flat, and a surface of the fourth film which surface is opposite to a surface of the fourth film which surface is in contact with the third film is formed to be flat.
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Specification