JPH0590929U - Flat transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] A secondary coil consisting of a spiral flat primary coil and a U-shaped flat copper plate is laminated on a resin insulating substrate via an insulating film, and a split type magnetic core is assembled from above and below. In the flat transformer, the primary side coil is easy to manufacture and has high reliability. [Structure] On both sides of a hard and thin resin insulating substrate 6, a spiral conductor 8 is centered on a central hole 17 through which the central magnetic leg 1a of the magnetic core 1 is passed, and on both sides of the resin insulating substrate is etched or plated an electric conductor foil. A flat transformer in which the double-sided spiral conductor is formed by filling the double-sided through hole 7 penetrating the substrate provided at the center of the spiral with the conductor integral with the spiral conductor to form the primary coil 2; To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a flat transformer having a low board mounting height when mounted on a board, and a coil conductor is formed in a two-layer structure on the primary coil and a thin resin board having rigidity to fit the coil bobbin. The present invention relates to a flat transformer using a primary coil having a simple structure.

[0002]

[Prior Art]

 In a conventional flat transformer of this type, as shown in FIG. 4, the flat coil 4, which corresponds to the primary coil, is usually formed by winding an adhesive-coated conductor wire in a spiral shape. The manufacturing of the side coil was technically difficult because the insulating coated copper wire having a circular cross section was wound in a flat shape, and there was a drawback that the electric characteristics also varied greatly.

[0003]

[Problems to be solved by the device]

 The present invention does not form the primary side coil into a flat plate shape by using an adhesive coated electric wire, but instead of centering the center frame of the coil bobbin into which the central magnetic leg of the magnetic core is inserted, on both sides of a hard and thin resin insulating substrate. A conductor that forms a spiral-shaped conductor that winds in the same direction on both sides, and fills the double-sided through hole with a double-sided through hole that passes from the front surface to the back surface of the substrate that connects the front and back spirals formed in the center of the spiral. To form a primary coil by integrally connecting with each other to form a primary coil which is easy to manufacture and has high reliability.

[0004]

[Means for Solving the Problems]

 To form the primary coil, paste a good electrical conductor, such as copper foil, on both sides of a resin insulating substrate made of hard and thin electrical insulating material, and attach the spiral coil to the surface coil around the center frame of the coil bobbin. A spiral coil is formed by etching or plating a copper plate that is pre-mounted on the substrate so that the coil on the back side is wound in the same direction, and a double-sided through hole is opened at the center of the spiral and the double-sided through hole is filled. The conductors of the spiral coil on the front surface and the back surface are connected by the above conductor to form the primary coil.

That is, according to the present invention, the central magnetic leg of the magnetic core is inserted in the center where the mounting terminals and the pin terminals that connect the terminals of the primary coil and the secondary coil integrally with the mounting terminals are implanted. A coil bobbin made of a resin molded body with a central frame is provided with a secondary coil made of a U-shaped flat copper plate with insulating films on both sides, and a primary coil made of a number of turns of copper wire. In a flat transformer that is laminated on a coil bobbin and has split magnetic cores assembled from the upper and lower surfaces, the primary coil is a good electrical conductor formed by winding the primary coil on both sides of a hard resin insulating substrate in the same spiral direction. A spiral conductor formed by etching or plating a conductor foil made of is formed in the center of the spiral of the spiral conductor in the double-sided through hole that penetrates through the hard resin insulating substrate and is integrated with the spiral conductors formed on the front and back sides. of The flat transformer is characterized in that it is formed by connecting with conductors filling the through holes on both sides.

[0006]

[Action]

 Since it is a spiral conductor formed on both sides of a resin insulating substrate made of a hard and thin electrical insulating material made of glass epoxy resin etc., the spiral conductor on the substrate surface is not bent with a small curvature, The spiral coil on the front surface and the spiral coil on the back surface have the same winding direction, and when the current flows through the coil, the magnetic fields created by the spiral coil on the front surface and the coil surface on the back surface are wound in the directions to urge each other. The spiral coil is connected by forming a hole through the front and back surfaces of the board at the center of the spiral, filling the hole with a conductor, and forming and connecting with the coil conductor formed on both front and back surfaces of the board. The primary coil can be easily handled and has high reliability without cracking.

[0007]

【Example】

 FIG. 2 shows a primary coil of a flat transformer according to the present invention, in which a spiral conductor 8 is formed on both sides of a resin insulating substrate 6 which is hard and thin but has little flexibility, and the center of the coil bobbin 5 shown in FIG. The spiral conductor 8 is formed on the front surface and the back surface of the resin insulating substrate 6 with the central hole 17 passing through the frame 16 as the center. The spiral conductors 8 formed on both front and back surfaces of the resin insulating substrate 6 are filled with conductors in the double-sided through hole 7 at the center of the spiral and connected. Both ends of the spiral conductor are connected to the pin terminals 15 attached to both ends of the coil bobbin 5 by the connecting portions 9 and 10. FIG. 1 shows an exploded perspective view of a flat transformer according to the present invention, in which a coil bobbin 5 is provided with a mounting terminal 13 for mounting on a substrate at both ends and a pin terminal 15 implanted integrally with the mounting terminal 13. A secondary coil copper plate 3 electrically insulated on both sides by a film 14 and a primary coil 2 having the same structure as shown in FIG. 2 are laminated, and the ends of the conductors of the respective coils are pin terminals of a coil bobbin. 15, and attach the magnetic core 1 from both upper and lower sides of the coil bobbin by inserting the central magnetic leg 1a of the magnetic core into the central frame 16 of the coil bobbin 5 and the central hole 17 of the primary coil, and fix the outer periphery with one-sided adhesive tape. The flat transformer according to the present invention. FIG. 3 shows a plan view of the completed flat transformer according to the present invention.

[0008]

[Effect of the device]

 Adhesive coating In a flat transformer in which a primary coil formed by shaping a copper wire into a spiral shape and a secondary coil consisting of a U-shaped flat copper plate are laminated on a coil bobbin, and a split type magnetic core is assembled and formed, conventional adhesive coating The primary coil, which is made by forming a copper wire into a spiral shape, is formed by forming a spiral coil in the same winding direction on both sides of the board centering on the central hole on both sides of a hard and less flexible resin insulation board. By forming the spiral coil formed in the spiral coil into a primary coil in which conductors are filled in the through holes on both sides at the center of the spiral, it is possible to provide a flat transformer that incorporates a highly reliable primary coil that is easy to manufacture. It became so.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a flat transformer according to the present invention.

FIG. 2 is an external perspective view of a primary coil of a flat transformer according to the present invention.

FIG. 3 is a plan view of a flat transformer according to the present invention.

FIG. 4 is an exploded perspective view of a conventional flat transformer.

[Explanation of symbols]

 1 magnetic core 1a central magnetic leg 2 primary coil 3 secondary coil copper plate 4 flat coil 5 coil bobbin 6 resin insulating substrate 7 double-sided through hole 8 spiral conductor 9,10 connection part 11 flat coil connection part 12 for fixing magnetic core Tape 13 Mounting terminal 14 Insulating film 15 Pin terminal 16 Center frame 17 Center hole

Claims (1)

[Scope of utility model registration request] 1. A mounting terminal at both ends, and a mounting terminal integrated with 1
Inserting insulating films on both sides into a coil bobbin made of a resin molded body with a center frame into which the center magnetic leg of the magnetic core is inserted in the center where the pin terminals that connect the ends of the secondary coil and the secondary coil are implanted In a flat transformer in which a secondary coil made of a U-shaped flat copper plate and a primary coil in which a copper wire is wound a large number of times are laminated on the coil bobbin, and split magnetic cores are assembled from the upper and lower surfaces of the flat transformer. A spiral conductor is formed by etching or plating a conductor foil made of a good electrical conductor formed by winding the side coil on both sides of a hard resin insulating substrate in the same spiral direction. A flat tiger characterized in that the double-sided through hole penetrating the hard resin insulating substrate formed in the center is connected and formed by a conductor filling the double-sided through hole integrated with the spiral conductors formed on the front and back sides. Nest.