JPH07211998A - High current wiring board - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a new large-current wiring board that can connect a printed board and an electric appliance without reducing the current capacity and has improved reliability. [Structure] Printed board for carrying large current In the above, there was used a large current wiring board characterized in that a copper bar was attached to the upper surface of the printed board, and a copper ring was press-fitted and integrated into the copper bar.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-current wiring board in which a copper bar is attached to a printed board on which a large-current circuit is formed.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a copper bar mounted on a printed circuit board on which a large current circuit is formed is subjected to a burring process on the copper bar 2 mounted on the upper surface of the printed circuit board 1 so that the printed circuit board 1 can be processed. It is projected by about 0 to 1 mm on the lower surface of the above, and thereby the connection is made by bolting with the electric contact surface of the electric device arranged under the printed circuit board 1.

As another method, as shown in FIG. 3, a large-diameter through hole is opened in the printed circuit board 1, and a copper ring 4 is press-fitted into the through hole so that the copper ring 4 protrudes from the lower surface of the printed circuit board 1. Connection was made by bolting with the electric contact surface of the electric device 6 arranged under the printed circuit board 1.

[0004]

In the case of the above-mentioned burring process, the burring height is restricted because the copper bar is projected and processed by the mold, and when the burring height is increased, the burring cross-sectional area is increased accordingly. Has to be reduced, which reduces the current capacity and weakens the mechanical strength when screwing.

Further, when another copper bar to be connected is to be connected to the upper part of the printed board 1, according to the conventional method,
Since the height between the printed board 1 and the copper bar to be connected is equal to the thickness of the copper bar 2 (1 to 3 mm), parts with a height higher than this thickness are arranged on the printed board for connection. Since the copper bar cannot be connected and the effective area of the printed circuit board is reduced, the area of the printed circuit board must be increased.

When a through hole is formed in a printed circuit board and a copper ring is press-fitted into the printed circuit board, the coefficient of linear expansion of the copper ring and that of the printed circuit board are different due to a temperature rising cycle when a large amount of current is applied. Voids may be generated, which may cause reliability problems.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and provides a novel large-current wiring board in which a printed wiring board and an electric device can be connected without reducing the current capacity and the reliability is improved. It is in.

[0008]

In order to achieve the above object, the present invention provides a printed circuit board for carrying a large current,
A copper bar was attached to the upper surface of the printed circuit board, and a copper ring was press-fitted into the copper bar to integrate the copper bar.

[0009]

According to the large-current wiring board of the present invention, since the copper ring can be made to have any height, it is possible to connect the copper bar for connection and the printed board even if there are parts interposed therebetween. Therefore, it is possible to arrange the parts without being restricted by the parts. In addition, since the copper ring is press-fitted into a copper bar made of the same copper, no stress is applied to the holes of the printed circuit board, and there is no risk of gaps in the press-fitted part even after long-term use. Can be improved.

[0010]

EXAMPLE An example of the present invention will be described with reference to FIG. In FIG. 1, 1 is a printed circuit board, 2 is a copper bar, 4 is a copper ring, 5 is a copper bar for connection, 6 is an electric appliance, and 7 is a bolt. In the present invention, the copper ring 4 is press-fitted into the copper bar 2. They were integrated and soldered or riveted to the printed circuit board.
Further, as a method of press-fitting and integrating the copper ring 4 into the copper bar 2, both ends of the copper ring 4 are pressed to the center with a tool to form a caulked portion and press-fit into the copper bar 4. When a component having a height is interposed between the copper bar 2 and the copper bar 5 to be connected, the copper ring 4 is press-fitted so as to protrude higher than the copper bar 2, or the copper ring 4 is long. A copper ring may be used.

[0011]

According to the high-current wiring board of the present invention, the height of the copper ring can be freely adjusted, so that the copper bar for connection and the printed board can be connected to each other even if parts are interposed. Therefore, it is possible to arrange the parts without being restricted by the parts. In addition, since the copper ring is press-fitted into a copper bar made of the same copper, no stress is applied to the holes of the printed circuit board, and there is no risk of a gap being created in the press-fitted part even after long-term use. Can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of a large current wiring board of the present invention.

FIG. 2 is a lateral cross-sectional explanatory view showing a large-current wiring board by a conventional burring process.

FIG. 3 is a cross-sectional explanatory view showing a conventional large-current wiring board in which a through hole is opened in a printed board and a copper ring is press-fitted and integrated.

[Explanation of symbols]

 1 Printed circuit board 2 Copper bar 3 Burring processing part 4 Copper ring 5 Copper bar for connection 6 Electric appliance 7 Bolt

Claims (2)

[Claims] 1. A printed circuit board for conducting a large current, wherein a copper bar is attached to an upper surface of the printed circuit board, and a copper ring is press-fitted into the copper bar so as to be integrated. 2. The high-current wiring board according to claim 1, wherein the copper ring has a caulked portion and is press-fitted into and integrated with the copper bar.