JP7019427B2 - Electronic control device - Google Patents

Description

The present invention relates to the structure of an electronic control device equipped with a high voltage transformer, and more particularly to a technique applicable to an electronic control device used in an environment accompanied by vibration such as for automobiles.

An electro-Rheological fluid (hereinafter also referred to as ERF) is used as a vehicle damper to individually control the dampers of the four wheels. The viscosity of ERF can be changed by applying a voltage from the outside, and the viscosity of the fluid can be directly controlled by an electric signal without having a moving part, so that there is an advantage of high responsiveness. However, the applied voltage is high, and an electronic device for a high-voltage control power supply is required.

Examples of applications of ERF in vehicles include clutches, engine mounts, and the like, which are used for shock absorption, torque control, vibration control, and the like, in addition to dampers.

In such a high-voltage control power supply electronic device for automobiles used in an environment accompanied by vibration, improving the reliability of the mounting portion (connection portion) with respect to vibration has become an important issue.

As a background technology in this technical field, for example, there is a technology such as Patent Document 1. Patent Document 1 describes a technique of connecting an output terminal to another printed wiring board via a connector in a power supply device having a transformer mounted on a printed wiring board by soldering an input terminal (FIG. 1 of Patent Document 1). 1) ”is disclosed.

According to the power supply device of Patent Document 1, by connecting to the printed wiring board via the connector, the workability is greatly improved because the soldering work is reduced, and the connection contact portion has elasticity, so that it is resistant to vibration. Will also be stronger.

Japanese Unexamined Patent Publication No. 2005-184883

By the way, in a transformer using ERF, it is necessary to boost a voltage of several V to a voltage of 5000 to 6000 V, which is larger and heavier than a conventional transformer. Further, in order to suppress the partial discharge between the transformer windings, it is necessary to cover the windings with a resin, and the weight of the transformer becomes even heavier.

When such a large and heavy transformer is mounted on a printed circuit board using the prior art as in Patent Document 1, the printed circuit board and the transformer vibrate even at a low frequency, and the transformer terminal is vibrated due to vibration during driving of a vehicle, for example. The reliability of the connection between the printed circuit board and the printed circuit board (connection by solder or connector) may decrease.

Therefore, an object of the present invention is highly reliable electronic control capable of suppressing the influence of vibration on the connection portion between the transformer terminal and the printed circuit board in an electronic control device used in an environment accompanied by vibration such as for automobiles. To provide the device.

In order to solve the above problems, the present invention includes a substrate provided with a circuit, a transformer provided on the substrate, and a case in which the substrate is fixed, and the substrate is the transformer and the said. Located between the cases, the transformer has a transformer fixing portion that penetrates the substrate and fixes the transformer and the case, and terminals provided from the transformer through the substrate toward the case. The board is provided with a connecting member for electrically connecting the terminal and the circuit, and the terminal is provided with an insertion clasp that suppresses the movement of the terminal toward the case. This is an electronic control device in which the wiring inside the substrate is denser than the region where the transformer is arranged inside the substrate in the vicinity of the transformer fixing portion .

According to the present invention, in an electronic control device used in an environment accompanied by vibration such as for automobiles, a highly reliable electronic control device capable of suppressing the influence of vibration on the connection portion between the transformer terminal and the printed circuit board is provided. It can be realized.

Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

It is a perspective view of the automobile equipped with the electronic control device which concerns on one Embodiment of this invention. It is a top view of the electronic control device which concerns on one Embodiment of this invention. (Example 1) FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is a top view of the electronic control device which concerns on one Embodiment of this invention. (Example 2) FIG. 4 is a cross-sectional view taken along the line AA in FIG. It is a top view of the electronic control device which concerns on one Embodiment of this invention. (Modified example of Example 2) FIG. 6 is a cross-sectional view taken along the line AA in FIG. It is sectional drawing of the electronic control apparatus which concerns on one Embodiment of this invention. (Example 3) It is sectional drawing of the electronic control apparatus which concerns on one Embodiment of this invention. (Modified example of Example 3) It is a top view of the electronic control device which concerns on one Embodiment of this invention. (Example 4) FIG. 10 is a cross-sectional view taken along the line AA in FIG. It is a top view of the electronic control device which concerns on one Embodiment of this invention. (Example 5) FIG. 12 is a cross-sectional view taken along the line AA in FIG. It is sectional drawing of the electronic control apparatus which concerns on one Embodiment of this invention. (Example 6) It is a top view of the electronic control device which concerns on one Embodiment of this invention. (Example 7) FIG. 15 is a cross-sectional view taken along the line AA in FIG. It is sectional drawing of the electronic control apparatus which concerns on one Embodiment of this invention. (Variation example of Example 7)

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same components are designated by the same reference numerals, and the detailed description of the overlapping portions will be omitted.

The electronic control device of the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of an automobile equipped with the electronic control device of this embodiment. FIG. 2 shows a top view of the electronic control device of this embodiment, and FIG. 3 shows a cross section taken along the line AA of FIG. It should be noted that the configuration of the automobile 100 shown in FIG. 1 is a configuration common to each of the second and subsequent embodiments described later.

As shown in FIG. 1, the automobile 100 of this embodiment is individually provided with dampers 400 on each of the four wheels. Each of the four-wheel dampers 400 is individually connected to one central ECU 200 (Electronic Control Unit: a large number of computers, hereinafter also referred to as an ECU) installed in the automobile 100 by a harness cable 300.

When the automobile 100 travels, the four-wheel damper 400 individually contracts and expands (extends) according to the condition of the road surface to maintain the traveling performance of the automobile 100 and improve the riding comfort. Information regarding the contracted and expanded (extended) states of each of the four dampers 400, which changes depending on the road surface condition, is transmitted to the central ECU 200 via the harness cable 300.

The central ECU 200 has a built-in high voltage power supply device (transformer) for controlling the vertical vibration of each damper 400. As a result, the vertical vibration of each damper 400 can be controlled in response to a sudden change in the road surface, the running performance of the automobile 100 can be maintained, and the riding comfort can be improved. In order to control the vertical vibration of the damper 400, an electrorheological fluid whose viscosity changes depending on the applied voltage is sealed inside the damper 400.

Next, the transformer mounting structure of the electronic control device of this embodiment will be described with reference to FIGS. 2 and 3. A transformer 1 and a potting (resin filling) 4 are arranged in the transformer housing 3. The transformer terminal (input / output terminal) 2 protruding from the transformer housing 3 is connected to the printed circuit board 6 with solder 15. Further, an L-shaped fixing portion 5 connected to the transformer housing 3 and a printed circuit board 6 are fixed to the lower case convex portion 9 protruding from the lower case 7 by screws 8. In this embodiment (FIG. 2), the fixing portions 5 are provided at two locations substantially in the center of the longitudinal portions of the transformer housing 3. Further, the transformer terminal 2 is provided with an insertion fastener 10 (convex portion).

Next, the operation and effect of the transformer mounting structure of the present embodiment shown in FIGS. 2 and 3 will be described. As described above, the transformer 1 that boosts the voltage to 5000 to 6000 V is larger and heavier than the conventional transformer. Therefore, if the transformer 1 is mounted on the printed circuit board 6 as it is (by the conventional method), the rigidity of the printed circuit board 6 is low, so that the printed circuit board 6 shakes due to vibration, and at the connection portion between the transformer terminal 2 and the printed circuit board 6. The connection reliability of a certain solder 15 is lowered. On the other hand, in the transformer mounting structure of the present embodiment, since the transformer housing 3 is fixed to the lower case 7 via the fixing portion 5 of the transformer housing 3 and the printed circuit board 6, the rigidity is improved and the printed circuit board 6 is shaken. It is possible to suppress it.

Further, the transformer terminal 2 extends from the transformer housing 3 in which the transformer 1 and the potting 4 are built, and as shown in FIG. 3, the transformer terminal 2 is provided with an insertion fastener 10 (convex portion). There is. When the transformer housing 3 is soldered to the printed circuit board 6 in a floating state, when the fixing portion 5 and the printed circuit board 6 are then screwed to the lower case convex portion 9 by the screw 8, the insertion fastening 10 is not provided. In this case, the transformer terminal 2 is pushed against the printed circuit board 6, and distortion is generated in the surrounding solder. When this strain (strain) is large, cracks occur and the connection reliability of the solder 15 is lowered.

Therefore, by providing the insertion fastener 10 as in the present embodiment (FIG. 3), the transformer terminal 2 is not inserted into the printed circuit board 6 more than necessary by pushing the screw 8 when screwing, and the solder 15 is distorted. It is possible to suppress the occurrence of (strain).

It should be noted that the insertion fastener 10 is effective if it is larger than the hole in the printed circuit board 6. Therefore, it is preferable that the width (diameter) of the insertion fastener 10 is larger than the hole diameter of the transformer terminal 2 and the printed circuit board 6. The method of manufacturing the insertion fastener 10 may be formed by punching a metal plate with a press, for example, or by partially pressing a metal terminal with a metal piece. Further, it may be formed by connecting a metal rod to a metal rod (ring-shaped metal).

Further, in this embodiment, the fixing portions 5 are provided at two locations substantially in the center of the longitudinal portions of the transformer housing 3. This is because it is more advantageous for vibration than the short side of the transformer housing 3 being a fixed portion.

The electronic control device of the second embodiment will be described with reference to FIGS. 4 to 7. FIG. 4 shows a top view of the electronic control device of this embodiment, and FIG. 5 shows a cross section taken along the line AA of FIG. Further, FIG. 6 is a modification of FIG. 4, and FIG. 7 shows a cross section taken along the line AA of FIG.

As shown in FIGS. 4 and 6, the transformer mounting structure of this embodiment is provided at two locations in that the fixing portions 5 are provided at three locations (FIG. 4) or four locations (FIG. 6). It is different from the electronic control device of 2). The configuration is the same as that of the first embodiment except for the number of fixed portions 5 installed, such that the insertion fastener 10 is provided at the connection portion between the transformer terminal 2 and the printed circuit board 6.

By increasing the number of the fixing portions 5 to three or four as in the present embodiment, it is possible to more effectively suppress the influence of vibration on the connection portion (solder 15) between the transformer terminal 2 and the printed circuit board 6. ..

A lot of heat is generated from the transformer 1. Therefore, by making the transformer housing 3 made of metal, heat can be efficiently dissipated to the lower case 9 via the fixing portion 5 and the screw 8, which is suitable for heat dissipation. Further, electromagnetic noise may be generated from the transformer 1 that boosts the voltage to 5000 to 6000 V. Therefore, since it is possible to shield noise by making the transformer housing 3 made of metal, it is more preferable that the transformer housing 3 is made of metal.

The electronic control device of the third embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 shows a cross section of the electronic control device of this embodiment. Further, FIG. 9 is a modification of FIG. 8.

In this embodiment shown in FIGS. 8 and 9, a method (structure) as an alternative to the insertion fastener 10 is shown. As shown in FIG. 8, by providing a curved portion (bent portion) 14 in the transformer terminal 2 instead of the insertion fastener 10, the fixing portion 5 and the printed circuit board 6 are screwed to the lower case convex portion 9 by the screw 8. At this time, the transformer terminal 2 is pushed against the printed circuit board 6, but the curved portion (bent portion) 14 can absorb the displacement, so that the generation of strain (strain) on the solder 15 connected to the transformer terminal 2 is suppressed. can do.

Further, as shown in FIG. 9, by using the press-fit terminal 11 as the transformer terminal (input / output terminal) instead of providing the curved portion (bent portion) 14 in the transformer terminal 2, it becomes unnecessary to connect with solder. The connection reliability between the transformer terminal 2 and the printed circuit board 6 can be ensured.

The press-fit terminal is a non-solder type press-fit type in which a plurality of terminals (press-fit portions) are inserted into a through-hole portion formed in a printed circuit board and are energized by contacting each other due to the deformation pressure of the press-fit portion. It is a terminal of the structure.

The electronic control device of the fourth embodiment will be described with reference to FIGS. 10 and 11. FIG. 10 shows a top view of the electronic control device of this embodiment, and FIG. 11 shows a cross section taken along the line AA of FIG. This embodiment corresponds to a modified example of the transformer mounting structure shown in FIGS. 6 and 7.

In the electronic control device of this embodiment, as shown in FIGS. 10 and 11, the switching power MOS transistor 12 is arranged on the printed circuit board 6 located on the convex portion 9 of the lower case. It is different from the electronic control device shown in FIGS. 6 and 7). The configuration is the same as that of the second embodiment (FIGS. 6 and 7) except for the switching power MOS transistor 12 in that the insertion fastener 10 is provided at the connection portion between the transformer terminal 2 and the printed circuit board 6.

In order to boost the voltage with the transformer 1, it is necessary to convert it into alternating current with the switching power MOS transistor 12. The amount of heat generated by the switching power MOS transistor 12 used in the transformer that boosts the voltage to 5000 to 6000 V is large. Therefore, by arranging the switching power MOS transistor 12 having a large amount of heat generation on the convex portion 9 of the lower case as in the present embodiment, the heat dissipation effect from the switching power MOS transistor 12 to the lower case 7 can be improved. ..

As a result, the influence of heat from the switching power MOS transistor 12 on the connection portion (solder 15) between the transformer terminal 2 and the printed circuit board 6 can be suppressed, and the connection reliability between the transformer terminal 2 and the printed circuit board 6 is ensured. be able to.

The electronic control device of the fifth embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 shows a top view of the electronic control device of this embodiment, and FIG. 13 shows a cross section taken along the line AA of FIG. It should be noted that this embodiment corresponds to another modification of the transformer mounting structure shown in FIGS. 6 and 7.

In the electronic control device of this embodiment, as shown in FIGS. 12 and 13, the wirings 13 in the printed circuit board 6 are concentrated in the vicinity of the fixed portion 5, and the electronic control device of the present embodiment is arranged in the vicinity of the fixed portion 5. It is different from the electronic control device of 7). The configuration is the same as that of the second embodiment (FIGS. 6 and 7) except for the arrangement of the wiring 13 in the printed circuit board, such that the insertion fastener 10 is provided at the connection portion between the transformer terminal 2 and the printed circuit board 6.

By concentrating the wiring 13 in the printed circuit board 6 in the vicinity of the fixed portion 5 as in this embodiment, the thermal conductivity of the printed circuit board 6 is improved, and the heat dissipation effect from the transformer 1 to the lower case 7 is improved. Can be done.

As a result, the influence of heat from the transformer 1 on the connection portion (solder 15) between the transformer terminal 2 and the printed circuit board 6 can be suppressed, and the connection reliability between the transformer terminal 2 and the printed circuit board 6 can be ensured. ..

The electronic control device of the sixth embodiment will be described with reference to FIG. FIG. 14 shows a cross section of the electronic control device of this embodiment. This embodiment corresponds to a modified example of the transformer mounting structure shown in FIG.

As shown in FIG. 14, the transformer mounting structure of the present embodiment is electronically controlled according to the first embodiment (FIG. 3) in that the fixing portion 5, the screw 8, and the insulating material 16 covering the surface of the printed circuit board 6 are provided. Different from the device. The configuration is the same as that of the first embodiment (FIG. 3) except for the insulating material 16, such that the insertion fastener 10 is provided at the connection portion between the transformer terminal 2 and the printed circuit board 6.

In the printed circuit board 6 on which the transformer 1 that boosts the voltage to 5000 to 6000 V is mounted, the wiring inside the printed circuit board also has a high voltage, and protection (insulation) from the outside including the mounted parts is required. Further, the screw 8 may be loosened due to vibration.

Therefore, as in this embodiment, by protecting (coating) the surface of the fixing portion 5, the screw 8, and the printed circuit board 6 with the insulating material 16, the printed circuit board 6 including the fixing portion 5 and the screw 8 is protected (coated) from the outside. Protection (insulation) is possible, and loosening of the screw 8 can be suppressed.

Further, since the loosening of the screw 8 is suppressed, the connection reliability between the transformer terminal 2 and the printed circuit board 6 can be ensured in this embodiment as well.

The electronic control device of the seventh embodiment will be described with reference to FIGS. 15 to 17. FIG. 15 shows a top view of the electronic control device of this embodiment, and FIG. 16 shows a cross section taken along the line AA of FIG. Further, FIG. 17 is a modification of FIG. 16.

In the electronic control device of this embodiment, as shown in FIGS. 15 and 16, instead of providing the insertion fastener 10, four bosses 18 are arranged in the vicinity of the transformer housing 3, and four bosses 18 are further provided. The structure is fixed to the upper case 17. The boss 18 is connected and fixed to the printed circuit board 6 by screws 8.

As described above, since the rigidity of the printed circuit board 6 is low, when the printed circuit board 6 is shaken by vibration, the connection reliability of the solder 15 which is the connection portion between the transformer terminal 2 and the printed circuit board 6 is lowered.

Therefore, as in this embodiment, by arranging the boss 18 as a reinforcing member in the vicinity of the transformer housing 3, that is, in the vicinity of the connection portion (solder 15) between the transformer terminal 2 and the printed circuit board 6, the printed circuit board 6 is provided. Since the rigidity can be complemented, it is possible to suppress the occurrence of strain on the solder 15 connected to the transformer terminal 2. As a result, the connection reliability between the transformer terminal 2 and the printed circuit board 6 can be ensured.

Although FIG. 15 shows an example in which four bosses 18 are arranged in the vicinity of the transformer housing 3, it is sufficient if the strain (strain) on the solder 15 can be suppressed, and two or three bosses 18 are used. It may be arranged in the vicinity of the transformer housing 3.

Further, as shown in FIG. 17, an L-shaped fixing portion (connecting portion) 5 is provided in the transformer housing 3, and a part of the fixing portion (connecting portion) 5 is a printed circuit board 6 and four (plural). By arranging it between the boss 18 and the boss 18, the rigidity of the printed circuit board 6 is further complemented, and the occurrence of strain (strain) on the solder 15 connected to the transformer terminal 2 is more reliably suppressed. Can be done.

A through hole for the screw 8 may be provided in the fixing portion (connection portion) 5, the screw 8 may be passed through the through hole in the fixing portion (connection portion) 5, and the boss 18 may be connected and fixed to the printed circuit board 6. The fixing portion (connecting portion) 5 may be provided so as to be arranged between the printed circuit board 6 and the four (plural) bosses 18 while avoiding the screw 8 (so as not to interfere with the screw 8).

According to each of the above-described embodiments, the connection reliability between the transformer terminal 2 and the printed circuit board 6 can be ensured, so that the reliability is high in an electronic control device used in an environment accompanied by vibration such as for automobiles. It is possible to realize a highly electronic control device.

In the automobile 100 shown in FIG. 1, the electronic control device (central ECU 200) is arranged in the engine room (near the engine), except for the undercarriage (near the wheels) of the automobile that directly receives vibration from the road surface. The same effect can be obtained by applying the present invention to an electronic control device installed in a trunk room or the like, which is relatively susceptible to vibration.

Further, the present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

1 ... Transformer 2 ... Transformer terminal (input / output terminal)
3 ... Transformer housing 4 ... Potting (resin filling)
5 ... Fixed part (of transformer housing 3) 6 ... Printed circuit board 7 ... Lower case 8 ... Screw 9 ... Lower case convex part 10 ... (Terminal) Insertion fastening 11 ... Press-fit terminal 12 ... Switching power MOS transistor 13 ... Wiring ( Wiring in the printed circuit board)
14 ... Curved part (bent part)
15 ... Solder (solder)
16 ... Insulation material 17 ... Upper case 18 ... Boss 100 ... Automobile 200 ... Central ECU
300 ... Harness cable 400 ... Damper

Claims (11)

The board on which the circuit is installed and
The transformer provided on the substrate and
With a case to which the substrate is fixed,
The substrate is located between the transformer and the case.
The transformer is provided with a transformer fixing portion that penetrates the substrate and fixes the transformer and the case, and a terminal that penetrates the substrate and is provided toward the case.
The substrate is provided with a connecting member that electrically connects the terminal and the circuit.
The terminal is provided with an insertion clasp that suppresses the movement of the terminal toward the case.
An electronic control device in which wiring inside the board is denser than the area where the transformer is arranged inside the board in the vicinity of the transformer fixing portion . The electronic control device according to claim 1.
The insertion clasp is an electronic control device which is any one of a convex portion provided on the terminal, a ring-shaped member provided on the terminal, a curved portion provided on the terminal, and a bent portion provided on the terminal. The electronic control device according to claim 1.
The terminal is a press-fit terminal.
The insertion clasp is an electronic control device which is a press-fit portion of the press-fit terminal. The electronic control device according to any one of claims 1 to 3.
The transformer fixing portion is an electronic control device provided at least at two or more places with the transformer interposed therebetween. The electronic control device according to claim 4.
The transformer fixing portion is an electronic control device provided at one place on one side and two places on the other side of the transformer. The electronic control device according to claim 4.
The transformer fixing portions are electronic control devices provided at two locations on one side and two locations on the other side of the transformer. The electronic control device according to any one of claims 1 to 6.
The transformer has a transformer housing that covers the transformer.
The transformer fixing portion is an electronic control device provided in the transformer housing. The electronic control device according to claim 7.
The transformer housing has an L-shaped connection portion and has an L-shaped connection portion.
An electronic control device fixed to the case by a screw inserted into a through hole provided in the connection portion. The electronic control device according to claim 1.
An electronic control device in which a power MOS transistor is arranged on the substrate in the vicinity of the transformer on the opposite side of the portion where the substrate is in contact with the case. The electronic control device according to claim 1.
An electronic control device in which the surface of the transformer fixing portion and the substrate provided with the transformer is covered with an insulating resin. The electronic control device according to any one of claims 1 to 10 .
An electronic control device located either in the engine room or in the trunk room of a car.

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