JP2001352641A - Connection structure between power element and bus bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently arrange a circuit pattern without providing a wide circuit pattern on a printed circuit board when electrically connecting a power element and a bus bar to a printed circuit board on which electronic components are mounted. And miniaturization of printed circuit boards. SOLUTION: A connection terminal of a power element and a connection terminal of a bus bar are inserted into a single connection hole formed in a printed circuit board, respectively, and are electrically connected integrally to a conductive portion of the printed circuit board surface. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a power element and a bus bar, and more particularly to a connection structure between a power element and a bus bar related to an electric junction box having a printed circuit board for an automobile.

[0002]

2. Description of the Related Art In recent years, in the automobile industry, attention has been paid to hybrid vehicles and electric vehicles due to environmental problems, and the driving voltage has been increasing. For this reason, power elements such as power ICs and semiconductor switching elements (transistors) are increasingly used in electric junction boxes and the like provided in automobiles. The electrical junction box and the like also incorporate a printed circuit board on which various electronic components (such as resistors, capacitors, diodes, and transistors) and ICs (integrated circuits) are mounted.

Generally, a power transistor or the like used as such a power element has an on-resistance due to its structure, and therefore, when energized, W = I ² R (I: current, R: on-resistance) It generates Joule heat represented by the following formula: Therefore, when the power element is mounted on a printed circuit board together with other electronic components, the generated heat has a thermal effect on other electronic components mounted on the same printed circuit board. When an IC, a super-integrated circuit (LSI), or the like is mounted, the heat generated by the power element causes the IC, the LSI, or the like to rise in temperature, causing an operation failure or shortening the life of the IC or the LSI. I will. Therefore, for such a reason, it is general that the printed circuit board and the power element are separated from each other and connected, and the power element is mounted on a heat radiating plate provided with heat radiating fins or the like as a heat radiation measure.

FIG. 3A shows a connection structure between a power element 6 and a printed circuit board 2 which is generally used in the prior art. An insulating heat dissipation sheet 8 is provided on a metal heat dissipation plate 10. And the power element 6 is mounted thereon with screws 12 or the like, and the connection terminal 6a pulled out from the power element 6 is inserted into the connection hole 2a formed in the printed circuit board 2 and soldered to the land 4a. , The power element 6 is electrically connected to the pattern circuit 4 of the printed circuit board 2.

FIG. 3B shows a connection structure between the printed circuit board 2 and a bus bar 14 connected to a power supply for driving the printed circuit board 2. 14 connecting terminal 14a to the printed circuit board 2
The bus bar 14 is electrically connected to the pattern circuit 4 of the printed circuit board 2 by being inserted into the connection hole 2a formed in the printed circuit board 2 and soldered to the land 4a.

Therefore, when it is desired to connect the output of the power element 6 to the printed circuit board 2 (signal system) and the bus bar 14 (power system), a configuration as shown in FIG. 4 can be considered. This is because the connection terminals 6a of the power element 6 and the connection terminals 14a of the bus bar 14 on the heat radiation sheet 8 are formed in the printed circuit board 2 at a certain interval, respectively.
, And soldered so that the connection terminals 6 a and 14 a are connected by a conductor circuit on the printed circuit board 2. This means that the output of the power element 6 is once transmitted to the printed circuit board 2 and the pattern circuit 4 of the printed circuit board 2 is
This is a method in which the power is supplied by being electrically connected to the bus bar 14 via the.

[0007]

However, when the electronic component mounted on the printed circuit board 2 is a digital element, the circuit pattern width of the signal line may be narrow (for example, 0.1 mm, 0.2 mm, etc.). A power element 6 for driving a control target such as a motor or a solenoid, and a bus bar 14
, The width of the circuit pattern needs to be widened according to the current value.

Therefore, the area occupied by the wide circuit pattern on the printed circuit board 2 increases, and the connection occupation area also increases because two lands 4a for connecting the power element 6 and the bus bar 14 are required. And efficient pattern placement cannot be achieved, and if the two connection holes are not separated, thermal expansion and
For example, the printed board may be cracked due to repeated shrinkage or the like, which hinders downsizing of the printed board 2.

An object of the present invention is to efficiently connect a power element and a bus bar to a printed circuit board on which electronic components are mounted without providing a wide circuit pattern on the printed circuit board. It is an object of the present invention to enable a circuit pattern to be arranged and realize a small printed circuit board.

[0010]

According to a first aspect of the present invention, there is provided a connection structure for connecting a power element and a bus bar on a printed circuit board. The gist of the present invention is that it is integrally inserted into a single connection hole formed in a substrate and is electrically connected integrally to a conductive portion on the surface of the printed circuit board.

According to the connection structure of the power element and the bus bar according to the first aspect of the present invention, each connection terminal of the power element and the bus bar is inserted into a single connection hole formed in the printed circuit board. Since it is electrically connected to the conductive part of the printed circuit board, a wide circuit pattern as in the past is not formed on the printed circuit board,
Further, since the number of lands is reduced, the circuit pattern can be efficiently arranged in a small connection occupied space, and the printed circuit board can be miniaturized.

According to a second aspect of the present invention, there is provided a connection structure between a power element and a bus bar, wherein one of the connection terminal of the power element and the connection terminal of the bus bar is formed on the printed circuit board. The gist is that it is inserted into one connection hole and electrically connected to the conductive portion on the printed circuit board surface, and is electrically connected to the one connection terminal without inserting the other connection terminal into the connection hole of the printed circuit board. Is what you do.

According to the connection structure of the power element and the bus bar according to the second aspect of the present invention, one of the connection terminals of the power element and the bus bar is inserted into a single connection hole formed in the printed circuit board to print the printed circuit board. Is electrically connected to the conductor and is electrically connected to the one connection terminal without inserting the other connection terminal into the connection hole of the printed circuit board. Such a wide circuit pattern is not formed, and the number of lands is reduced, so that the circuit pattern can be efficiently arranged in a small connection occupying space.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A connection structure between a power element and a bus bar according to an embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a power device 6 on a printed circuit board 2.
And the bus bar 14 are integrated into a single printed circuit board 2
It is configured to be connected to.

That is, in this embodiment, the printed circuit board 2 has electronic and electric components such as resistors, capacitors, diodes, transistors and ICs (integrated circuits) mounted on an insulating substrate 2b made of synthetic resin. Are electrically connected by a circuit pattern 4 which is a conductor circuit formed by printing on the substrate. The printed circuit board has a connection hole 2 through which the connection terminal 6a of the power element 6 and the connection terminal 14a of the bus bar 14 are integrally inserted.
a is formed, and a land 4a formed by conductor printing is formed around the connection hole 2a.

A power element 6 for supplying a drive voltage to a control object is fixed on a heat radiating sheet 8 made of synthetic resin laid on a metal heat radiating plate 10 by a screw 12 so as to improve heat radiation. A bus bar 14 which is closely fixed and transmits input and output of the power element 6 is provided. Heat radiation fins (not shown) are provided on the rear surface of the heat radiation plate 10 to enhance heat radiation. And the power element 6
Connection terminal 14a forming a connection portion with the printed circuit board 2 of
As shown in the figure, the heat dissipation sheet 8 is formed to be bent vertically from the surface thereof, and the tip thereof is formed in a tapered shape so as to be easily inserted into the connection hole 2a formed in the printed circuit board 2.

Bus bar 14 connected to printed circuit board 2
Are formed by punching a conductive metal plate, and are arranged on the heat radiating plate 10 via the heat radiating sheet 8. A connection terminal 14a which forms a connection portion of the bus bar 14 with the printed circuit board 2;
Is also formed to be bent perpendicular to the surface of the heat radiating sheet 8, and its end is formed with a connection hole 2 a formed in the printed circuit board 2.
It is formed in a tapered shape so that it can be easily inserted through.

In this case, the connection hole 2a of the printed circuit board 2
As shown in the figure, the connection terminal 6a of the power element 6 and the connection terminal 14a of the bus bar 14 are formed so as to be able to be brought into contact with each other and inserted therethrough. The connection terminal 6a of the power element 6, the connection terminal 14a of the bus bar 14, and the circuit pattern 4 are electrically connected by inserting the 6a, projecting it from the land 4a, and soldering.

Therefore, by adopting such a configuration, it becomes possible to electrically connect the power element and the bus bar without connecting using a wide conductor pattern on the printed circuit board 2 as in the related art. Since the number of lands is also reduced, electrical connection can be made in a small connection occupying space.

FIG. 2 shows another embodiment of the present invention. In the embodiment shown in FIG.
The connection terminal 6a of the power element 6 is inserted into the connection hole 2a of the printed circuit board 2 without passing through the connection terminal 14a of the bus bar 14.
a. As shown in the drawing, the vicinity of the base end of the connection terminal 6a of the power element 6 is bent and formed in a concave shape, and the concave shape 6b is applied to a bus bar 14 formed on the heat dissipation sheet 8 surface. The contact surfaces 16 are electrically connected by soldering or welding. The connection terminal 6a protruding above the power element 6 is inserted into the connection hole 2a of the printed circuit board 2, protruded from the land 4a, and soldered to the circuit pattern 4. .

Even with such a configuration, the connection terminal 6a of the power element 6 and the connection terminal 14a of the bus bar 14 are electrically connected without using a wide conductor pattern on the printed circuit board 2 as in the conventional case. As a result, the number of lands is reduced, and the same connection hole 2a as that of the related art can be used, so that electrical connection can be made in a smaller connection space.

In this case, the configuration of the connection terminal 6a of the power element 6 and the connection terminal 14a of the bus bar 14 are reversed.
The vicinity of the base end of the connection terminal 14a projecting above the bus bar 14 is bent and formed in a concave shape so that the connection terminal 6a of the power element 6 is brought into contact, and the contact part 16 is soldered or welded. It may be configured to be electrically connected.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and it goes without saying that the present invention can be implemented in various modes without departing from the spirit of the present invention.

[0024]

According to the connection structure of the power element and the bus bar according to the present invention, each connection terminal of the power element and the bus bar is inserted into a single connection hole formed in the printed circuit board so that the electric conduction of the printed circuit board is achieved. By electrically connecting to the body, it becomes possible to electrically connect the power element and the bus bar without connecting using a conventional wide pattern, and the number of lands is reduced. Since connection is possible, efficient pattern arrangement is possible, and the printed circuit board can be miniaturized.

Further, one of the connection terminals of the power element and the bus bar is inserted into a single connection hole formed in the printed circuit board and electrically connected to the conductor of the printed circuit board. The same effect as described above can be obtained by electrically connecting the connection terminal by contacting the one connection terminal without inserting the connection terminal into the connection hole of the printed circuit board.

Therefore, a printed circuit board on which various electronic components are mounted and a power element and a bus bar connected to the printed circuit board can be assembled in a compact manner, particularly in response to an increase in the driving voltage of a hybrid car or an electric car. The realization of such a method enables the electric junction box itself containing these components to be reduced in size and weight, and the actual benefits are extremely high.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a connection structure between a power element and a bus bar according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a connection structure between a power element and a bus bar according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a connection structure between a power element and a printed board, and a bus bar and a printed board, which are conventionally generally known.

FIG. 4 is a cross-sectional view showing a connection structure between a power element and a bus bar on a printed circuit board which can be considered as a conventional example.

[Explanation of symbols]

 2 printed circuit board 2a connection hole 4 circuit pattern 4a land 6 power element 6a connection terminal 8 heat radiation sheet 10 heat radiation plate 14 bus bar 14a connection terminal

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Ryuharu Nakanishi 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi F-term in Harness Research Institute, Inc. (reference) 5E077 BB18 BB28 BB31 BB38 CC22 DD01 FF21 HH07 JJ03 JJ05 JJ21 5G361 BA01 BA03 BB01 BC01

Claims (2)

[Claims] 1. A connection terminal of a power element and a connection terminal of a bus bar are inserted into a single connection hole formed in a printed circuit board, and electrically connected to a conductive portion of the printed circuit board surface. A connection structure between a power element and a bus bar, which is connected. 2. One of a connection terminal of a power element and a connection terminal of a bus bar is inserted into a single connection hole formed in the printed circuit board and electrically connected to a conductive portion on the surface of the printed circuit board. A connection structure between a power element and a bus bar, wherein the other connection terminal is electrically connected to the one connection terminal without being inserted into a connection hole of the printed circuit board.