JP3438862B2 - Electronic circuit device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic circuit device having a heat-generating component which is provided in contact with a metal member and conducts heat transfer cooling through the metal member.

[0002]

2. Description of the Related Art As is known in the art, power D
The C-DC converter circuit is an inverter circuit that converts input DC power into AC power, a transformer that changes the output voltage of the inverter circuit, a rectifying circuit that rectifies the output of the transformer, and a smoothing output voltage of the rectifying circuit. It has an output smoothing circuit for In addition, an input smoothing circuit is often provided to smooth the input current of the inverter circuit.

At least the power switching element of the inverter circuit among the above-mentioned elements constituting the power DC-DC converter circuit is fixed to the wiring board through a metal member for cooling and heat sink, and other elements constituting the DC-DC converter circuit. Circuit components are usually mounted on a wiring board.

[0004]

However, the power DC
Among the circuit components that form the -DC converter circuit (hereinafter simply referred to as the DC-DC converter circuit), the full-wave rectifier circuit module, the transformer, and the choke coil, which are the main heat-generating components, have different heights, and bus bars are used. Terminal connection was not easy.

Although it is possible to bend the bus bar in a complicated manner, in such a case, it sometimes happens that the terminal connection work becomes difficult. Further, since the transformer and the choke coil are higher in height than other circuit parts, the shape of the bus bar connecting the terminals of the transformer and the choke coil to other circuit parts is complicated, and the required space is increased. There was a problem.

Further, since these transformers or choke coils are heavier than other circuit parts, it is necessary to improve the strength of the wiring board that supports them.
Further, there is a problem that the life of the transformer or the choke coil is limited due to its heat generation. The present invention has been made in view of the above problems, and an object of the present invention is to provide an electronic circuit device that is excellent in the busbar turning property and the terminal connection property without impairing the cooling property of the heat-generating component.

Next, it is desired that the circuit elements mounted on the wiring board, for example, the snubber circuit chip in the DC-DC converter device described above, be improved in cooling performance due to its heat generation. The present invention has been made in view of the above problems, and an object of the present invention is to provide an electronic circuit device capable of improving the cooling performance of a wiring board mounted component while avoiding complication of a structure and a manufacturing process.
Has other purposes.

[0008]

An electronic circuit according to claim 1, wherein:
The device consists of a plurality of heat generating parts with terminals protruding laterally from the side surface.
Product, wiring board on which circuit elements are mounted on the mounting surface, and the wiring
The wiring board is arranged on the side opposite to the mounting surface of the board.
Made of metal that fixes and carries the multiple heat-generating components
On the base plate and the mounting surface side of the wiring board
Position closer to the wiring board than the top surface of the heat generating component
The heating parts are sewn and extended at
It is equipped with a busbar that is fastened to the terminal of the component
The plurality of heat-generating components are on the wiring board side of the base plate.
On the main surface of the
Terminals of the heat-generating component that are individually carried on the heat-component carrying surface.
Is high enough to be higher than the mounting surface by a specified distance.
And, the wiring board is provided at a height that overlaps the bus bar.
It is characterized in that it projects to the mounting surface side of. This invention
According to the above, in an electronic circuit device in which a wiring board for mounting circuit elements is provided above and parallel to a base plate for carrying heat-generating components, a plurality of heat-generating component carrying surfaces of the base plate carrying different heat-producing components have different heights. The height of each heating component can be freely adjusted according to the height of the connection terminal on the wiring board side, and the connection terminals such as bus bars (on the wiring board side) can be set freely. The arrangement and shape of the connection means) can be simplified, and the degree of freedom in design can be increased. Further, since the bottom surface of the heat-generating component is in close contact with the heat-generating component-carrying surface of the metal base plate, the cooling performance of the heat-generating component does not deteriorate. Furthermore, since the heat generating component is carried on the base plate below the wiring substrate, it is not necessary to improve the strength of the wiring substrate even if the heat generating component has a large weight. After all, according to the present configuration, it is possible to realize an electronic circuit device which is excellent in the busbar slewing property and the terminal connectability without impairing the cooling property of the heat-generating component.

[0009] The height of the heating component bearing surface is adjusted to a height at which the terminal of the heat-generating component which carries overlaps the connection terminal, the terminal of the heat-generating component, the bus bar which extends in the mounting surface of the wiring substrate Connected to the connection terminal. By doing so, the work of connecting the terminals of the heat-generating component can be simplified without devising the connection terminal structure on the wiring board side even if the heights of the heat-generating components vary.

Furthermore in claim 2 an electronic circuit device according to claim 1 Symbol placement according to the arrangement described, the heat generating component is protruded from the hole portion or the notch portion provided on the wiring board on the mounting surface of the wiring substrate It In this way, the connection terminal on the wiring board side may be provided at any position around the hole or cutout portion of the wiring board where the heat generating component is inserted, and the connection terminal and the terminal of the heat generating component are connected. It is easy to improve the degree of freedom in routing the connection terminal and the wiring member connected thereto, and the degree of freedom in arranging circuit elements on the wiring board can be increased.
Further, the possibility of realizing reduction of wiring resistance loss due to simplification of the wiring member increases.

[0011]

[0012]

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a DC-DC converter device as an example of an electronic circuit device of the present invention will be described with reference to the following embodiments.

[0014]

Embodiment 1 D as an embodiment of the electronic circuit device of the present invention
The C-DC converter device will be described with reference to FIG. FIG. 1 is a circuit diagram of this DC-DC converter device.
This DC-DC converter device is for converting a voltage from a main battery (not shown) for storing running energy of an electric vehicle to an auxiliary battery for supplying electric power to an auxiliary device and a control device for electric power supply, Input smoothing circuit 1 connected to a DC power supply (not shown) to smooth the current, inverter circuit 2 for converting DC power input from input smoothing circuit 1 to AC power, and output voltage of inverter circuit 2 changed And a full-wave rectifier circuit module 4 for rectifying the output of the transformer 3, and an inverter circuit having an output smoothing circuit 5 for smoothing the output voltage of the full-wave rectifier circuit module 4 as its main constituent elements, Further, it has a controller for controlling the inverter circuit 2, a current sensor, etc., and the output smoothing circuit 5 comprises a smoothing capacitor 6 and a choke coil 7.

Further, this DC-DC converter device is
As shown in FIG. 2 which is a perspective view, it has a wiring board 8 and a base plate (metal member in the present invention) 9 for mounting the above-mentioned components and circuit elements. On the mounting surface of the wiring board 8, a large number of bus bars 1 are sewn between each component and circuit element.
0 is extended. As is well known, the inverter circuit 2 has four IGBT modules (power switching elements).
Each of the IGBT modules 11 has an IGBT and a flyback diode connected in antiparallel.

The wiring board 8 is a multi-layered alumina board on which components and circuit elements other than the full-wave rectification circuit module 4, the IGBT module 11, the transformer 3 and the choke coil 7 are mounted on the mounting surface. To mount each component or circuit element on the wiring board 8, as shown in FIG. 4, terminals are inserted into holes provided in the wiring board 8 and fixed by soldering on the side opposite to the mounting surface of the wiring board 8. .

The base plate 9 is an aluminum member, and has a thick plate-like parallel plate portion 91 that is provided in the vicinity of the non-mounting surface of the wiring board 8 and extends in parallel therewith. It is composed of a linear projection portion 92 standing upright at a right angle to the parallel plate portion 91 toward the substrate 8 side, and a power switching element support plate portion 93. Power switching element support plate portion 93
On the main surface of the wiring board 8 side, each I of the inverter circuit 2
A heat sink on which the GBT module 11 is mounted, which is fastened to the top surface of the linear protrusion 92 with a screw 94,
As a result, the parallel plate portion 91 of the base plate 9 faces the non-mounting surface of the wiring board 8 with a predetermined space. Therefore, the parallel plate portion 91 of the base plate 9 has a case function of protecting the anti-mounting surface of the wiring board 8 and also has a function of a heat dissipation plate of the IGBT module 11.

One side of the wiring board 8 is fastened to a wiring board supporting projection 95 extending from the power switching element supporting plate portion 93 toward the wiring board 8 side in parallel with the wiring board 8. It is fastened to a wiring board supporting protrusion 96 which is erected from the parallel plate portion 91 toward the wiring board 8 side, whereby the base plate 9 also functions to support the wiring board 8.

As shown in FIGS. 3 and 4, the wiring board 8 has a hole portion 81 for inserting the transformer 3 and a cutout portion 82 for inserting the full-wave rectifier circuit module 4 and the choke coil 7.
And are provided. The transformer 3 is inserted into the hole portion 81, and the bottom surface of the transformer 3 is seated on a transformer pedestal portion 97 protruding from the upper surface of the parallel plate portion 91. The full-wave rectifier circuit module 4 is inserted into the cutout portion 82, and the bottom surface of the fullwave rectification circuit module 4 is seated on a pedestal portion 98 provided on the upper surface of the parallel plate portion 91. The choke coil 7 is inserted into the cutout portion 82 adjacent to the full-wave rectification circuit module 4, and the bottom surface of the choke coil 7 is seated on a pedestal portion 99 projecting from the upper surface of the parallel plate portion 91. That is, the base plate 9 has a function of carrying the transformer 3 and the choke coil 7, which are large-weight components, and the full-wave rectification circuit module 4 which is a large heat-generating component.
It also has the function of supporting and radiating heat.

The full-wave rectification circuit module 4 is fastened to a screw hole formed on the pedestal portion 98, but since the lower parts of the transformer 3 and the choke coil 7 are cores, the pedestal portion 97,
Not concluded in 99. The important thing here is that each pedestal 9
7 to 99 are formed to have different heights, and the terminals of the full-wave rectification circuit module 4, the transformer 3 and the choke coil 7 mounted on them are located above the mounting surface of the wiring board 8 for fastening. Each bus bar 10 of FIG.

The transformer 3 has a tripodal core 30 around which a primary coil and a secondary coil are wound, and a core pressing plate 31 is covered on the tripodal core 30. The core pressing plate 31 includes a pair of side plate portions 31 that are erected from the wiring board 8 along the side surfaces of the tripodal core 30.
1 and a top plate portion 312 provided between the tips of the both side plate portions 311 and in close contact with the top surface of the tripodal core 30. Both side plate portions 311 are fastened to the parallel plate portion 91 of the base plate 9 by screws penetrating the wiring board 8, whereby the transformer 3 is fixed to the wiring board 8 and the base plate 9. A central portion of the top plate portion 312 is curved toward the transformer 3 side and elastically biases the transformer 3 toward the parallel plate portion 91 of the base plate 9.

The choke coil 7 has a tripodal core 70 around which the coil is wound, and a core pressing plate 71 is covered on the tripodal core 70. The core pressing plate 71 is provided between the pair of side plate portions 711 that are erected from the wiring board 8 along the side surfaces of the tripodal core 70 and the tips of the side plate portions 711, and is in close contact with the top surface of the tripodal core 70. It is a gate-shaped thin plate metal member having a top plate portion 712. The side plate portions 711 are fastened to the parallel plate portion 91 of the base plate 9 with screws penetrating the wiring board 8, whereby the choke coil 7 is fixed to the wiring board 8 and the base plate 9. The central portion of the top plate portion 712 is curved toward the choke coil 7 side and elastically biases the choke coil 7 toward the parallel plate portion 91 of the base plate 9.

Next, the order of assembling the main parts of the DC-DC converter device will be described below. First, mount the necessary parts and circuit elements, and then mount the power switching element support plate 9
3 is fastened, and the wiring board 8 in which the IGBT module 11 and the connection conductor layer on the wiring board are connected by a wire is fastened to the parallel plate portion 91 and the linear protrusion portion 92 of the base plate 9.

Next, the transformer 3, the full-wave rectification circuit module 4 and the choke coil 7 are attached from above, the full-wave rectification circuit module 4 is fastened, and the core pressing plate 3 is attached.
Fasten 1, 71. Finally, the terminals of the transformer 3, the full-wave rectifier circuit module 4, and the choke coil 7 are fastened to the bus bar 10 or the like. D of the present embodiment described above
The advantages of the C-DC converter device will be described below.

The base plate (metal member) 9 that supports the power switching element of the inverter circuit 2 to cool it and also supports the wiring board protects the wiring board 8 from the non-mounting surface at a predetermined interval. Further, the base plate 9 can be brought into close contact with the bottom surface of the transformer 3 or the choke coil 7 to support and cool it. Also, the terminals of the transformer 3 and the choke coil 7, which are taller because they have the core, can be shifted to the wiring board 8 side by the amount of the gap between the base plate 9 and the wiring board 8, so that they are mounted on the wiring board 8. It is easy to connect other short-circuited parts or circuit elements to the terminals of the transformer 3 or the choke coil 7.

Moreover, since the transformer 3, the full-wave rectifier circuit module 4 and the choke coil 7 are brought into close contact with the parallel plate portion 91 of the base plate 9 through the holes and the cutout portions of the wiring board 8, the transformer 3, etc. Compared with the case where the components are provided around the wiring board 8, the components can be provided at appropriate places on the wiring, the space distribution between the components and the wiring can be simplified, and the physique of the DC-DC converter device can be improved. It is also effective for reduction. Further, the hole or notch provided in the wiring board 8 for inserting the transformer 3 or the choke coil 7 can also be used as a guide for positioning the transformer 3 or the choke coil 7.

Further, as shown in FIG. 4, the transformer 3, the full-wave rectification circuit module 4, the choke coil 7, that is, the top surfaces of the pedestals 97 to 99 of the base plate carrying the respective heat-generating components (the heat-generating component-supporting surface) are as shown in FIG. The heights are set to be different from each other, whereby the terminals of these heat-generating components can be easily fastened to the bus bars 10 above the base plate 9, respectively. Further, by this fastening, each heat generating component is pressed against the parallel plate portion 91 of the base plate 9 to reduce the heat transfer resistance.

Furthermore, these pedestal parts 97 to 99 can be manufactured by aluminum die casting of the base plate 9, and the manufacturing process is not complicated. (Modification) In the above embodiment, the heat-generating component carrying surface is the top surface of the pedestal portion (cooling convex portion) 97 to 99, but the parallel plate portion 9
Needless to say, it may be a bottom surface recessed in 1,
Of course, one of the heat generating component carrying surfaces may be the main surface of the parallel plate portion 91.

[0029]

[0030]

[0031]

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a DC-DC converter device of the present invention.

FIG. 2 is a perspective view of the DC-DC converter device shown in FIG.

FIG. 3 is a partial perspective view of the DC-DC converter device shown in FIG.

FIG. 4 is an exploded perspective view of the DC-DC converter device shown in FIG .

[Explanation of symbols]

3 is a transformer (heating component), 4 is a full-wave rectification circuit module (heating component), 7 is a choke coil (heating component),
8, 8a are wiring boards, 9 and 9a are base plates, 10
Is a bus bar, 97 to 99 are pedestals, 81 is a hole in the wiring board 8, 82 is a notch in the wiring board 8, 103, 104
Is a solder layer (conductor layer for terminal connection), and 92a and 93a are cooling projections.

Claims (2)

(57) [Claims] 1. A plurality of heat-generating components in which terminals project laterally from a side surface, a wiring board on which a circuit element is mounted on a mounting surface, and the wiring board is fixed by being arranged on the opposite side of the mounting surface of the wiring board. And a metal base plate that carries the plurality of heat-generating components, and sew the heat-generating components at a position closer to the wiring board than the top surface of the heat-generating components on the mounting surface side of the wiring substrate. A bus bar that is provided and that is fastened to the terminals of the heat-generating component in an overlapping manner, and the plurality of heat-generating components are individually carried by a plurality of heat-generating component carrying surfaces provided at different heights on the base plate. Projecting toward the mounting surface side of the wiring board, and the plurality of heat-generating component carrying surfaces set the terminals of the heat-generating component carried by themselves at a position above the mounting surface and overlapping the bus bar. Electronic circuit device, characterized in that to be set for. 2. The electronic circuit device according to claim 1, wherein the heat-generating component projects from a hole or a notch provided in the wiring board toward a mounting surface side of the wiring board. Electronic circuit device .