Power supply device

Patent metadata

Field	Value
Publication number	US-11772829-B2
Application number	US-201817254313-A
Country	US
Kind code	B2
Filing date	Jun 27, 2018
Priority date	Jun 27, 2018
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A power supply device ( 104 - 1 ) includes a substrate ( 20 ) on which an electric component ( 25 ) is mounted, a chassis ( 10 ) having a chassis surface ( 11 ) and a threaded part ( 10 a ), a chassis-side resin part ( 91 ) connected to a back surface ( 20 a ) and the chassis surface ( 11 ), a fixation screw ( 29 ), and an insulating member ( 60 ). The fixation screw ( 29 ) fixes both the electric component ( 25 ) and the substrate ( 20 ) to the chassis ( 10 ) by screw-coupling an end part ( 29 c ) of the fixation screw ( 29 ), exposed in a direction toward the chassis ( 10 ) from an open hole formed through the insulating member ( 60 ), to the threaded part ( 10 a ) of the chassis ( 10 ). In addition, the fixation screw ( 29 ) brings the electric component ( 25 ) and the chassis ( 10 ) into electrical noncontact with each other by being placed in an open hole of the insulating member ( 60 ).

First claim

The invention claimed is:

1. A power supply device to be used in a spacecraft, the power supply device comprising: a substrate on which an electric component is mounted on a mounting surface; a chassis having a chassis surface facing a back surface which is the opposite side of the mounting surface and a threaded part having undergone threading; a chassis-side resin part being an insulating resin-cured material to be placed between the back surface of the substrate and the chassis surface so as to be connected to the back surface and the chassis surface, the cured insulating resin with a thermal conductivity between 1 W/mK and 10 W/mK inclusive; a fixation screw having a threaded shaft part; and an insulating member through which an open hole in which the fixation screw is to be placed is formed, wherein open holes are formed through the electric component and the substrate, the insulating member includes a first placement part placed in a space formed by continuous placement of the open hole of the electric component and the open hole of the substrate and a second placement part placed outside the open hole of the electric component so as to be in contact with a peripheral edge of the open hole of the electric component, the fixation screw fixes both the electric component and the substrate to the chassis by screw-coupling an end part of the shaft part, exposed in a direction toward the chassis from the open hole of the insulating member, to the threaded part of the chassis and brings the electric component and the chassis into electrical noncontact with each other by being placed in the open hole of the insulating member, the substrate includes a plurality of filled through-holes in which a plurality of through-holes penetrating from the back surface, which is one surface to the mounting surface, which is the other surface are filled with a heat transfer material, and the chassis and a ground terminal of the electric component are kept at different potentials.

2. The power supply device according to claim 1 , wherein
the threaded part of the chassis is formed integrally with the chassis.

3. The power supply device according to claim 1 , wherein
the threaded part of the chassis is a component separate from the chassis.

4. The power supply device according to claim 1 , further comprising:
a columnar part which is raised in shape of a column from the chassis surface, is threaded, and has an end surface, facing in a raising direction, to be connected to the back surface of the substrate; and
a coupling screw to be screw-coupled to the columnar part, wherein
an open hole is formed through the substrate at a position to be connected to the columnar part, and
the coupling screw fixes the substrate to the columnar part by penetrating the open hole formed at the position to be connected to the columnar part and by being screw-coupled to the columnar part.

5. The power supply device according to claim 4 , wherein
the columnar part is formed integrally with the chassis.

6. The power supply device according to claim 4 , wherein
the columnar part is a component separate from the chassis.

7. The power supply device according to claim 1 , wherein
an upper limit of a total radiation dose to be received for 15 years is 5 Mrad or less.

8. The power supply device according to claim 1 , wherein
the chassis-side resin part has a Shore A hardness of 50 or less, after being cured, and has a Shore A hardness of 70 or less, after being exposed to radiation with the total radiation dose of 5 Mrad to be received for 15 years.

9. A power supply device to be used in a spacecraft, the power supply device comprising: a substrate on which an electric component is mounted on a mounting surface; a chassis having a chassis surface facing a back surface which is the opposite side of the mounting surface; a chassis-side resin part being an insulating resin-cured material to be placed between the back surface of the substrate and the chassis surface so as to be connected to the back surface and the chassis surface, the cured insulating resin with a thermal conductivity between 1 W/mK and 10 W/mK inclusive; and a fixation screw having a threaded shaft part, wherein open holes are formed through the electric component and the substrate, the fixation screw, having the shaft part inserted into a space formed by continuous placement of the open hole of the electric component and the open hole of the substrate and having an end part of the shaft part exposed from the space, fixes the electric component and the substrate each other by screw-coupling the exposed end part to a nut, the electric component and the chassis are not in electrical contact with each other, the substrate includes a plurality of filled through-holes in which a plurality of through-holes penetrating from the back surface, which is one surface to the mounting surface, which is the other surface are filled with a heat transfer material, and the chassis and a ground terminal of the electric component are kept at different potentials.

Assignees

• Mitsubishi Electric Corp

Inventors

• Miyamoto Takashi
• Yasuda Naoki
• Okada Shinichi
• Kusano Ryota

Classifications

• H10W40/70

  Fillings or auxiliary members in containers or in encapsulations for thermal protection or control · CPC title

• H10W40/611

  Bolts or screws · CPC title

• H10W40/60

  Securing means for detachable heating or cooling arrangements, e.g. clamps · CPC title

• H10W40/251

  Organics · CPC title

• H10W40/228

  the projecting parts being wire-shaped or pin-shaped · CPC title