Transformer having reverse structure, power supply, and flat panel display device including the same

Patent metadata

Field	Value
Publication number	US-12500029-B2
Application number	US-202217676268-A
Country	US
Kind code	B2
Filing date	Feb 21, 2022
Priority date	Feb 26, 2021
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

A transformer having a reverse structure includes: a bobbin part including an inner bobbin and an outer bobbin including, respectively, body parts having through-holes formed therein and having a tubular shape and flange portions protruding outwardly from both ends of the body parts; coils respectively wound in the inner bobbin and the outer bobbin; and a core electrically coupled to the coils to form a magnetic circuit, wherein the inner bobbin and the outer bobbin include, respectively, external connection terminals fastened to one ends of the flange portions formed at an upper end of the body part and bent in a downward direction.

First claim

What is claimed is:

1 . A transformer comprising:
a bobbin part including an inner bobbin and an outer bobbin including, respectively, body parts having through-holes formed therein and having a tubular shape and flange portions protruding outwardly from both ends of the body parts; coils respectively wound in the inner bobbin and the outer bobbin; and a core electrically coupled to the coils to form a magnetic circuit, wherein the inner bobbin and the outer bobbin include, respectively, external connection terminals fastened to one ends of the flange portions (hereinafter, referred to as upper flange portions) formed at an upper end of the body part and bent in a downward direction.

2 . The transformer of claim 1 , wherein the inner bobbin and the outer bobbin are coupled to each other so that the external connection terminal of the inner bobbin and the external connection terminal of the outer bobbin are disposed in opposite directions.

3 . The transformer of claim 2 , wherein the outer bobbin and the inner bobbin further include, respectively, terminal fastening parts protruding outwardly from one ends of the upper flange portions and to which the external connection terminals are fastened.

4 . The transformer of claim 3 , wherein the inner bobbin is coupled to the outer bobbin while one end and the other end thereof are supported by the upper flange portion of the outer bobbin through the terminal fastening part provided in the inner bobbin and a wing portion provided in the inner bobbin, respectively.

5 . The transformer of claim 4 , wherein the outer bobbin includes a guide block protruding from an upper surface of the upper flange portion of the outer bobbin in parallel with the terminal fastening part of the outer bobbin and covering a portion of the through-hole of the outer bobbin, and
the wing portion protrudes from an upper surface of the upper flange portion of the inner bobbin in parallel with the guide block so as to be in contact with the guide block, and is formed to be spaced apart from one end of the upper flange portion of the inner bobbin by a predetermined distance, such that one end of the upper flange portion of the inner bobbin is inserted into a lower portion of the guide block, and both ends of the wing portion are formed to be longer than a width of the through-hole of the outer bobbin by a predetermined length so as to be supported by an upper surface of the outer bobbin in a width direction.

6 . The transformer of claim 1 , further comprising an insulating cap increasing a creepage distance between the external connection terminal of the inner bobbin and the coil wound in the outer bobbin.

7 . The transformer of claim 6 , wherein the insulating cap is configured between the external connection terminal of the inner bobbin and the flange portion of the outer bobbin so that one end of the flange portion of the outer bobbin is inserted thereinto.

8 . The transformer of claim 7 , wherein the insulating cap has a rectangular parallelepiped shape of which an inner space is empty, one end of the flange portion of the outer bobbin is inserted into the inner space through an opened portion of a front surface of the insulating cap, and an area of an upper surface of the insulating cap corresponding to the terminal fastening part is opened, such that a portion of the flange portion is exposed externally.

9 . The transformer of claim 7 , wherein at least one fitting projection is formed on each of both sides of the flange portion of the outer bobbin inserted into the insulating cap, and
at least one fitting hole into which the fitting projection is inserted is formed in positions on both sides of the insulating cap corresponding to the fitting projection.

10 . The transformer of claim 7 , wherein at least one grip part protruding outwardly in order to facilitate a grip of the insulating cap is formed on each of both sides of the insulating cap.

11 . The transformer of claim 1 , wherein an inner surface of the flange portion of the inner bobbin and an inner surface of the flange portion of the outer bobbin are coplanar with each other.

12 . The transformer of claim 11 , wherein the outer bobbin further includes a bending portion protruding downwardly from one end of a flange portion (hereinafter, referred to as a ‘lower flange portion’) formed at a lower end of the body part of the outer bobbin and bending a lead wire of the coil wound around the body part of the outer bobbin to connect the lead wire of the coil to the external connection terminal of the outer bobbin.

13 . The transformer of claim 1 , wherein the outer bobbin includes a coil carry-forward part that is a path by which a lead wire of the coil wound around the body part of the outer bobbin is carried forward to an upper surface of the flange portion of the outer bobbin through an outer peripheral edge of the flange portion of the outer bobbin and is connected to the external connection terminal of the outer bobbin.

14 . The transformer of claim 13 , wherein the coil carry-forward part includes:
a carry-forward groove that is a path in which a lead wire of the coil wound around the body part of the outer bobbin is carried forward to an upper surface of the flange portion of the outer bobbin; and a traversing path that is a path disposed so that the lead wire carried forward through the carry-forward groove traverses the upper surface of the flange portion of the outer bobbin.

15 . The transformer of claim 13 , wherein the outer bobbin includes a terminal fastening part protruding outwardly from one end of the upper flange portion of the outer bobbin and to which the external connection terminal is fastened, and
the coil carry-forward part is a path formed between the terminal fastening part of the outer bobbin and a guide block protruding from an upper surface of the upper flange portion of the outer bobbin in parallel with the terminal fastening part of the outer bobbin.

16 . The transformer of claim 15 , wherein the guide block has one end protruding outwardly from an outer peripheral edge of the upper flange portion of the outer bobbin, and
the carry-forward groove is a groove formed by the protruding one end of the guide block, the terminal fastening part of the outer bobbin, and the upper flange portion of the outer bobbin.

17 . A power supply comprising:
a board in which an accommodation part is formed; and a transformer mounted in the accommodation part formed in the board and including a bobbin part including a body part having a through-hole formed therein and having a tubular shape and flange portions protruding outwardly from both ends of the body part, wherein an upper surface of a lower flange portion of the flange portion is coplanar with an upper surface of the board or is positioned on a level below the upper surface of the board.

18 . The power supply of claim 17 , wherein an external connection terminal bent in a downward direction is fastened to one end of an upper flange portion of the flange portion.

19 . A flat panel display device comprising:
the power supply of claim 17 ; a display panel receiving power from the power supply; and a cover protecting the display panel and the power supply, wherein the power supply is connected to one surface of the display panel in parallel with one surface of the display panel.

Assignees

• Solum Co Ltd

Inventors

• Kwon Chang Yong
• Ryu Dong Kyun
• Bang Yun Sic

Classifications

• H05K5/03

  Covers · CPC title

• H05K5/0017

  with operator interface units · CPC title

• H01F27/325 Primary

  Coil bobbins (formers for coils in general H01F5/02) · CPC title

• H01F27/306

  Fastening or mounting coils or windings on core, casing or other support · CPC title

• H01F27/24

  Magnetic cores · CPC title