JP2013069707A - Electronic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic control device capable of suppressing deterioration of cutoff performance due to cutoff wiring provided on a high density substrate surface.SOLUTION: Cutoff wiring 30 is constituted so that connection via the cutoff wiring 30 is cut off by being fused in response to heat generation due to over-current. Then, in a solder resist 28 covering a substrate surface, a rectangular opening 28a for exposing at least a part of the cutoff wiring 30 to an outside is formed. This opening 28a is formed so that a portion in a central vicinity of total length of a highest heat-generating portion out of the cutoff wiring 30 is exposed to the outside.

Description

  The present invention relates to an electronic control device in which a cutoff wiring for overcurrent protection is provided on a substrate.

  In recent years, in electronic control devices that are densified by small components, the short-circuit current that occurs at the time of a short-circuit failure in the miniaturized components does not reach a large current, so a fuse provided in response to a failure related to the electronic control device It takes a long time to shut off, and in particular, a large fuse that protects a plurality of electronic control devices for the purpose of reducing costs by reducing the number of installed fuses requires a longer time to shut off. For this reason, problems such as an increase in the temperature of parts at the time of interruption and a long-time voltage drop in the power supply wiring or the like occur. On the other hand, common wiring such as power supply wiring (for example, battery path and ground path) that is shared by many circuits and components mounted with the advancement of electronic control and multi-functionality and supplies power necessary for operation, such as A relatively large current flows even during normal operation of the apparatus. For this reason, since the breaking current of the large fuse provided in the shared wiring path tends to be further increased, there is a concern that a sufficient breaking performance cannot be ensured by a short circuit failure of individual circuits or components. For example, in the case of an apparatus having not only a high environmental temperature but also a large number of mounting apparatuses, such as an electronic control apparatus for a vehicle, the above-described problem becomes significant.

  For this reason, as in the printed circuit board control device disclosed in Patent Document 1 below, a short-circuit failure is provided by providing a cut-off wiring in the power supply wiring path on each board and fusing the cut-off wiring when an overcurrent flows. Sometimes the power supply wiring path is interrupted for each substrate or device.

JP 2007-31467 A

  By the way, on the highly densified board surface, a component mounting wiring such as a land to which electronic components are mounted and connected and a common wiring shared by a plurality of electronic components including the electronic components are arranged close to each other. Is done. In general, a protective film such as a solder resist is formed on the wiring except for the connecting portion, and the protective film is also formed on the cut-off wiring provided between the wiring connecting the common wiring and the component mounting wiring. .

  The cut-off wiring exhibits a cut-off function by melting and rupturing the molten conductor generated by melting in response to heat generated by overcurrent. However, in such a cut-off wiring, depending on the fusing condition, there is a problem that a part of the molten conductor may stay without being suitably diffused, and the fusing position and fusing time vary, resulting in a drop in the cut-off performance. is there.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide an electronic control device that can suppress a decrease in interruption performance due to interruption wiring provided on a highly densified substrate surface. It is to provide.

  In order to achieve the above object, in the electronic control device according to claim 1, a plurality of electronic components are mounted and connected on a substrate, and the electronic components are shared by the plurality of electronic components. An electronic control device in which at least one overcurrent protection interruption wiring is provided between wirings connected to the shared wiring, and the interruption wiring is cut off by fusing in response to heat generated by overcurrent. Wiring that cuts off the connection through the wiring, and the substrate is provided with a protective layer covering the substrate surface including the blocking wiring, and a part of the blocking wiring is provided on the protective layer. An opening to be exposed is formed.

  According to a second aspect of the present invention, in the electronic control device according to the first aspect, the opening is formed so as to expose a portion of the cut-off wiring that generates the most heat.

  According to a third aspect of the present invention, in the electronic control device according to the first or second aspect, the opening is formed so as to expose a part of the shared wiring in addition to a part of the blocking wiring. And

  According to a fourth aspect of the present invention, in the electronic control device according to any one of the first to third aspects, a plurality of the cut-off wirings are provided according to the plurality of electronic components, and the openings are formed of the cut-off wirings. A plurality of parts are provided so as to expose each part.

  According to a fifth aspect of the present invention, in the electronic control device according to any one of the first to fourth aspects, a second opening that exposes a region adjacent to the blocking wiring communicates with the opening in the protective layer. It is formed as follows.

  According to a sixth aspect of the present invention, in the electronic control device according to the fifth aspect, the second opening is formed deeper than the opening.

  According to a seventh aspect of the present invention, in the electronic control device according to the sixth aspect, the bottom surface in the region where the second opening and the opening communicate with each other is formed so as to gradually become deeper toward the second opening side. It is characterized by.

  The invention according to claim 8 is the electronic control device according to any one of claims 5 to 7, wherein the molten conductor generated by fusing the cut-off wiring is attached to the second opening. Means are provided.

  Invention of Claim 9 is an electronic control apparatus as described in any one of Claims 1-7. The adhesion means which adheres the fusion | melting conductor produced | generated by the blowout of the said interruption | blocking wiring to the vicinity of the said interruption | blocking wiring Is provided.

  A tenth aspect of the present invention is the electronic control device according to any one of the first to ninth aspects, wherein the cutoff wiring is a connection wiring to at least one of the common wiring and the component mounting wiring. The connection wiring is formed such that a cross-sectional area at a connection site with the cut-off wiring is smaller than a cross-sectional area at a connection site with the connection target. .

  According to an eleventh aspect of the present invention, in the electronic control device according to the tenth aspect of the present invention, in the connection wiring, the cross-sectional area of the connection portion with the connection target is narrowed with respect to the cross-sectional area on the center side of the connection wiring. It is characterized by being formed small.

  According to a twelfth aspect of the present invention, in the electronic control device according to any one of the first to eleventh aspects, the shared wiring is more than a plurality of other electronic components other than the electronic components connected to the blocking wiring. A heat radiating portion made of the same material as that of the shared wiring is formed at a position where the wiring distance is shorter than the cutoff wiring.

  A thirteenth aspect of the present invention is the electronic control device according to any one of the first to twelfth aspects, wherein the electronic control device according to any one of the first to twelfth aspects is provided for heat diffusion that diffuses heat generated by overcurrent in the interrupting wiring in the vicinity of the interrupting wiring. A wiring is formed.

  According to a fourteenth aspect of the present invention, in the electronic control device according to any one of the first to thirteenth aspects, the blocking wiring includes a first wiring portion and a second wiring portion having a wiring length shorter than the first wiring. Are connected at a predetermined angle such that one of the first wiring portion and the second wiring portion is connected to the shared wiring and the other is connected to the component mounting wiring. It is characterized by being set.

  According to a fifteenth aspect of the present invention, in the electronic control device according to any one of the first to fourteenth aspects, the shared wiring is a power supply wiring.

  According to a sixteenth aspect of the present invention, in the electronic control device according to the fifteenth aspect, the power supply wiring is connected to a power supply that supplies power to another device different from the electronic control device. A common fuse for protecting the other device is provided on a power supply path from the power supply.

  In the first aspect of the invention, the cutoff wiring is configured to cut off the connection via the cutoff wiring by fusing in response to heat generated by overcurrent, and the protective layer covering the substrate surface includes An opening exposing a part is formed.

  For this reason, when the cut-off wiring is melted in response to the heat generated by the overcurrent, the molten conductor generated by this melting flows out of the opening. Thereby, since a molten conductor becomes difficult to stay, the fall of the interruption | blocking performance by interruption | blocking wiring can be suppressed.

  In the invention of claim 2, since the opening is formed so as to expose the most heat-generating part of the interrupting wiring, the opening is provided corresponding to the part of the interrupting wiring that is easily melted. It is possible to surely suppress the stay and to reliably suppress the deterioration of the interruption performance due to the interruption wiring.

  In the invention of claim 3, since the opening is formed so as to expose a part of the common wiring in addition to a part of the interruption wiring, the molten conductor generated by the melting of the interruption wiring is exposed in the opening. It becomes easy to adhere to a part of the shared wiring. As a result, the retention of the molten conductor can be suppressed, and the high temperature molten conductor can be prevented from flowing out of the opening and affecting other electronic components.

  According to a fourth aspect of the present invention, a plurality of cutoff wirings are provided according to a plurality of electronic components, and a plurality of openings are provided so as to expose a part of these cutoff wirings. For this reason, even when a plurality of interrupting wirings are provided, the molten conductor in each of the interrupting wirings is less likely to stay, so that the deterioration of the interrupting performance due to the interrupting wirings provided on the high-density board surface is suppressed. can do.

  In the fifth aspect of the present invention, the protective layer is formed so that the second opening that exposes a region close to the cutoff wiring communicates with the opening, and therefore, the molten conductor generated by fusing the cutoff wiring has the second opening. Will flow into. Thereby, while restraining retention of a molten conductor, it can suppress that a high temperature molten conductor flows out and influences other electronic components.

  In the invention of claim 6, since the second opening is formed deeper than the opening, it is possible to suppress the retention of the molten conductor and to suppress the outflow of the molten conductor flowing into the second opening.

  In the invention of claim 7, since the bottom surface in the region where the second opening and the opening communicate with each other is formed so as to gradually become deeper toward the second opening side, the retention of the molten conductor is suppressed, and from the opening The molten conductor can be suitably flowed into the second opening.

  In the invention according to claim 8, since the adhering means for adhering the molten conductor generated as the breaker wire is fused is provided in the second opening, the molten conductor is prevented from staying and flows into the second opening. The outflow of the molten conductor can be reliably suppressed.

  According to the ninth aspect of the present invention, when a high-temperature molten conductor is generated at the time of cutting off the cutoff wiring, the molten conductor adheres to the attachment means provided in the vicinity of the cutoff wiring when flowing on the surface of the substrate. To do. Thereby, a molten conductor is hold | maintained in the state adhering to the adhesion | attachment means, and loses fluidity by hardening with heat dissipation. Therefore, it is possible to suppress the deterioration of the interruption performance due to the interruption wiring, and to suppress the influence on other electronic components and the like due to the flow of the molten conductor.

  In the invention of claim 10, the cutoff wiring is connected to the connection target of at least one of the shared wiring and the component mounting wiring via the connection wiring, and this connection wiring is connected to the cutoff wiring at the connection site. The cross-sectional area is smaller than the cross-sectional area at the connection site with the connection target.

  For this reason, when the heat generated in the cut-off wiring due to overcurrent is transmitted to the connection target (shared wiring / component mounting wiring) via the connection wiring, compared to the case of direct transmission to the connection target, Heat diffusion is suppressed. Thereby, since the variation in the temperature rise in the interruption wiring is suppressed, it is possible to suppress the deterioration of the interruption performance due to the interruption wiring provided on the highly densified substrate surface. When the connection wiring is provided between the interruption wiring and the component mounting wiring, the heat generated in the interruption wiring due to overcurrent is diffused in the connection wiring and transferred to the component mounting wiring. Temperature rise is mitigated. Thereby, even if it is a case where solder with comparatively low melting | fusing point is used for component mounting wiring, melting of the solder by the heat | fever from interruption | blocking wiring can be suppressed.

  In the invention of claim 11, the connection wiring is formed small so that the cross-sectional area of the connection portion (hereinafter also referred to as a throttle portion) with the connection target is narrowed with respect to the cross-sectional area on the center side of the connection wiring. For this reason, the heat transmitted to the connection wiring via the cut-off wiring is less likely to be transmitted from the throttle portion to the connection target, and is stored in a portion of the connection wiring excluding the throttle portion (hereinafter also referred to as a heat holding portion). . Since heat from the interruption wiring is stored in the heat holding part in this way, since the temperature of the heat holding part at the time of interruption is maintained at a relatively high temperature, variation in temperature rise in the interruption wiring is suppressed, It is possible to reliably suppress the deterioration of the interruption performance due to the interruption wiring. In particular, by setting the connection wiring and disconnection wiring to a predetermined shape and material, etc., the interrupting conditions are uniquely determined so that variation is suppressed, so the interrupting wiring and connection wiring are applied as a single combination for general purposes. can do. Moreover, since the heat storage amount of the connection wiring can be controlled by changing the volume of the heat holding part, the fusing timing of the interruption wiring can be easily adjusted.

  In the invention of claim 12, the shared wiring is made of the same material as the shared wiring at a position where the wiring distance is shorter than the plurality of electronic components other than the electronic components connected to the blocking wiring. The heat radiating part is formed. For this reason, when the heat generated in the interruption wiring due to the overcurrent is transmitted to the common wiring, the heat is transmitted to the adjacent heat radiating portion and is radiated, and is difficult to be transmitted to other electronic components connected to the common wiring. Thereby, the influence on the other electronic component by the heat which generate | occur | produced with the interruption | blocking wiring provided in the board | substrate surface densified can be suppressed.

  In the invention of claim 13, when the heat generated by the overcurrent is transmitted to the surroundings through the substrate or the like, it is diffused by the thermal diffusion wiring provided in the vicinity of the cutoff wiring as a heat source, Heat transfer to other electronic components to be protected from heat is suppressed. Thereby, while suppressing the fall of the interruption | blocking performance by interruption | blocking wiring, normal operation | movement of said other electronic component can be maintained.

  In the invention of claim 14, the cutoff wiring is formed by connecting the first wiring portion and the second wiring portion having a wiring length shorter than the first wiring at a predetermined angle. One of the wiring part and the second wiring part is set to be connected to the shared wiring, and the other is connected to the component mounting wiring. For this reason, compared with the case where the interruption | blocking wiring is formed linearly, the wiring length can be lengthened, connecting the adjacent common wiring and component mounting wiring. As a result, it becomes easy to ensure the required length of the interrupting wiring even in a limited mounting area, so that it is possible to suppress a decrease in the interrupting performance due to the interrupting wiring and to reduce the size of the apparatus.

  In the fifteenth aspect of the invention, since the common wiring is a power supply wiring, a large current flows, so that the above-described cutoff wiring is provided between the power supply wiring formed with a relatively wide wiring width and the component mounting wiring. Even if it exists, the fall of the interruption | blocking performance by this interruption | blocking wiring can be suppressed.

  In the invention of claim 16, the power supply wiring is connected to a power supply for supplying power to another device different from the electronic control device, and a common fuse for protecting the electronic control device and the other device is provided. , Provided on the power supply path from the power supply. As a result, even when the electronic control device provided with the interruption wiring is short-circuited or the like, the interruption wiring is blown out, so that the influence on the power supply to other devices can be eliminated.

It is a block diagram showing a schematic structure of a vehicle control system provided with a traction control device concerning a 1st embodiment. It is explanatory drawing which shows the principal part of the traction control apparatus of FIG. It is sectional drawing by the cut surface equivalent to the 3-3 line of FIG. It is an enlarged view which expands and shows the interruption | blocking wiring vicinity of FIG. It is explanatory drawing for demonstrating the detailed shape of the verification interruption | blocking wiring and the verification opening. It is a graph which shows the relationship between the interruption | blocking electric current value and fusing time about the presence or absence of a verification opening. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on the 1st modification of 1st Embodiment. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on the 2nd modification of 1st Embodiment. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on the 3rd modification of 1st Embodiment. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on the 4th modification of 1st Embodiment. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on 2nd Embodiment. FIG. 12A is an explanatory view showing a main part of the traction control device according to the third embodiment, and FIG. 12B is a cross-sectional view taken along the line 12B-12B in FIG. It is. FIG. 13A is an explanatory view showing a main part of a traction control device according to a first modification of the third embodiment, and FIG. 13B corresponds to a line 13B-13B in FIG. It is sectional drawing by a cut surface. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on the 2nd modification of 3rd Embodiment. FIG. 15A is an explanatory view showing a main part of a traction control device according to a third modification of the third embodiment, and FIG. 15B corresponds to the line 15B-15B in FIG. 15A. It is sectional drawing by a cut surface. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on 4th Embodiment. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on 5th Embodiment. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on 6th Embodiment. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on the 1st modification of 6th Embodiment. It is explanatory drawing which shows the principal part of the traction control apparatus which concerns on 7th Embodiment. It is explanatory drawing which shows the principal part of the electronic control apparatus which concerns on 8th Embodiment.

[First Embodiment]
Hereinafter, an electronic control device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a schematic configuration of a vehicle control system 11 including a traction control device 20 according to the first embodiment.
As shown in FIG. 1, the vehicle control system 11 includes a plurality of electronic control devices 12 such as an engine ECU, a brake ECU, a steering ECU, a body ECU, and a navigation device that control various devices mounted on the automobile 10. It is configured.

  In addition to the plurality of electronic control devices 12, the vehicle control system 11 is provided with a traction control device 20 to which the electronic control device according to the first embodiment is applied. The traction control device 20 is a device having an acceleration slip prevention function for preventing an acceleration slip of a drive wheel, and is a device that is relatively less important than other electronic control devices for main vehicle control such as travel control.

  The plurality of electronic control devices 12 including the traction control device 20 are electrically connected to a DC power source (hereinafter referred to as a battery 13) via either a fuse 14a or a fuse 14b used for overcurrent protection. Yes. As the fuse 14a and the fuse 14b, large fuses for 15A or 20A, for example, are employed because they are provided in a path for supplying electric power necessary for operation to many electronic control devices. Thereby, for example, when a malfunction occurs in any of the various electronic control devices 12 connected to the fuse 14a and an overcurrent exceeding a predetermined current value is generated, the fuse 14a is blown by the overcurrent, and the fuse 14a The electric power supply via is cut off, and adverse effects on other electronic control devices 12 are prevented. In the present embodiment, each electronic control unit 12 is electrically connected to the battery 13 via either one of the two large fuses 14a and 14b. However, the present invention is not limited to this. Each may be electrically connected to the battery 13 via a fuse, or may be electrically connected to the battery 13 via any one of three or more fuses.

  Next, the configuration of the traction control device 20 according to the first embodiment will be described with reference to FIGS. FIG. 2 is an explanatory diagram showing a main part of the traction control device 20 of FIG. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. FIG. 4 is an enlarged view showing the vicinity of the cutoff wiring 30 in FIG. 2 in an enlarged manner. 2 and 4, for the sake of convenience, illustration of the solder resist 28 that protects the substrate surface is omitted except for the opening 28a, and in FIG. 3, the thickness of the cutoff wiring 30 and the like is exaggerated. .

  The traction control device 20 is configured such that a circuit board 21 on which a plurality of electronic components 22 for realizing the above-described accelerated slip prevention function are mounted with a high density is housed in a case (not shown). The circuit board 21 is electrically connected to an external device or other electronic control device 12 via a connector or the like not shown in the figure, and accelerates the driving wheel according to a predetermined signal input from the outside. Perform control to prevent.

  As shown in FIG. 2, power wirings 23 for supplying power from the battery 13 are electrically connected to the electronic components 22 on the circuit board 21. For this reason, the power supply wiring 23 functions as a shared wiring shared by the electronic components 22.

  As shown in FIGS. 2 and 3, a ceramic capacitor 24 is mounted on the circuit board 21 as one of the plurality of electronic components 22. In order to improve the temperature characteristic and the frequency characteristic and realize a small capacity and a large capacity, the ceramic capacitor 24 is formed by, for example, stacking and integrating a barium titanate-based high dielectric constant ceramic dielectric 24b and an internal electrode 24c in layers. It is configured.

  Between the land 26 to which the external electrode 24 a of the ceramic capacitor 24 is connected via the solder 25 and the power supply wiring 23, a cutoff wiring 30 is disposed. The cutoff wiring 30 is a wiring that exhibits an overcurrent protection function by fusing in response to heat generated by an overcurrent, and cuts off an electrical connection through the cutoff wiring 30. Thereby, the overcurrent protection according to the board | substrate is realizable.

  Here, the cutoff wiring 30 is set so that the wiring width (the width of the wiring orthogonal to the current direction on the substrate surface) is sufficiently smaller than the wiring width of the power supply wiring 23. Specifically, for example, the wiring width of the cutoff wiring 30 is set to about 0.2 to 0.3 mm, and the wiring width of the power supply wiring 23 is set to about 2 mm. The land 26 may correspond to an example of “component mounting wiring” recited in the claims.

  As shown in FIG. 3, on the inner layer side of the cutoff wiring 30, the thickness of the cutoff wiring 30 (the length in the direction orthogonal to the substrate surface) is made shorter than the thickness of the power supply wiring 23 and the land 26. A heat transfer suppression member 27 for suppressing heat transfer from the wiring 30 to the inner layer side is provided. The heat transfer suppression member 27 is configured using, for example, a resist material that protects the substrate surface, and is disposed so that the heat transfer suppression member 27 is positioned on the inner layer side of the blocking wiring 30 when the blocking wiring 30 is formed. Thus, the thickness of the cutoff wiring 30 can be easily reduced.

  As shown in FIGS. 3 and 4, the solder resist 28, which is a protective layer for protecting the substrate surface, has a rectangular opening 28a for exposing a part of the blocking wiring 30 to the outside. Yes. Specifically, the opening 28a is formed so as to expose the central vicinity of the entire length, which is the most heat generating portion of the cutoff wiring 30, to the outside.

  Here, the reason why the opening 28a is formed will be described with reference to FIGS. FIG. 5 is an explanatory diagram for explaining the detailed shapes of the verification cutoff wiring 101 and the verification opening 102. FIG. 6 is a graph showing the relationship between the cutoff current value I and the fusing time t with or without the verification opening 102.

  A predetermined current is passed through the verification cutoff wiring 101 partially exposed through the verification opening 102 having the dimensions shown in FIG. 5, and the cutoff current value I when the verification cutoff wiring 101 is melted and the verification cutoff. The fusing time t until the wiring 101 is melted is measured. Further, the cutoff current value I and the fusing time t when a predetermined current is passed through the verification cutoff wiring 101 in which the verification opening 102 is not formed are measured. Here, the verification cutoff wiring 101 has its entire length L1 set to 2.85 mm and its width W1 set to 0.25 mm. The verification opening 102 has an opening length L2 parallel to L1 set to 0.6 mm and an opening width W2 set to 0.25 mm. In FIG. 5, for convenience of explanation, the opening width W2 is illustrated to be longer than the width W1.

  The relationship between the cut-off current value I and the fusing time t measured as described above is shown in the graph of FIG. Here, a thick solid line S1 shown in FIG. 6 shows a relationship between the cutoff current value I and the fusing time t in the verification cutoff wiring 101 partially exposed by the verification opening 102, and a thick broken line centering on the thick solid line S1. The range surrounded by indicates the variation range of the fusing time t in the cut-off current value I. A thin solid line S2 shown in FIG. 6 indicates the relationship between the cutoff current value I and the fusing time t in the verification cutoff wiring 101 in which the verification opening 102 is not formed, and is surrounded by a thin broken line with the fine solid line S2 as the center. The range indicates a range of variation in the fusing time t in the cut-off current value I.

  As can be seen from FIG. 6, at the same breaking current value, the fusing time t is shortened by forming the verification opening 102. Further, the variation in the fusing time t is small at the same breaking current value. On the other hand, in the verification cutoff wiring 101 in which the verification opening 102 is not formed, the fusing time t is longer in each overcurrent region and the fusing time t varies more than in the case where the verification opening 102 is formed. Has occurred. This is because the molten conductor generated by fusing the verification cutoff wiring 101 flows out of the verification opening 102 and does not easily stay at the position of the verification cutoff wiring 101 before the fusing.

  For this reason, by exposing a part of the cut-off wiring 30 through the opening 28a, the fusing time t is shortened and a protective action is obtained at an early stage, and the temperature rise of the parts to be protected can be suppressed. Furthermore, it is possible to greatly reduce the influence time of the voltage drop on the power supply wiring 23 when the cutoff wiring 30 is shut off. Further, by reducing the variation in the fusing time t, it is possible to adopt a capacitor having a smaller capacity, such as a stabilizing capacitor (power stabilization means) that takes into account the fusing time of the cutoff wiring 30 in each device or circuit, Cost reduction and size reduction can be achieved. Furthermore, since the fusing time t can be reduced even in the rated current range, the degree of freedom in circuit design can be improved.

  In the traction control device 20 configured as described above, for example, when the ceramic capacitor 24 is short-circuited due to damage or the like and an overcurrent flows through the cutoff wiring 30, the cutoff wiring 30 generates heat according to the overcurrent. When this heat generation exceeds a predetermined temperature, the cut-off wiring 30 is melted and the electrical connection via the cut-off wiring 30 is cut off. Thereby, the other electronic components 22 connected to the power supply wiring 23 are protected from the overcurrent. Further, since the current at the time of interruption is not so large as to cut off the fuse 14a, damage to the traction control device 20 does not affect other electronic control devices 12 that are supplied with power through the fuse 14a. . Furthermore, the time from the occurrence of overcurrent to the blowout of the interruption wiring 30 is about several mS (milliseconds), and the fusing time of the large fuses 14a, 14b, etc. is usually about 0.02S (seconds). Therefore, overcurrent protection can be suitably implemented even with an electronic control device or electronic component that can improve the processing speed.

  In particular, in the present embodiment, the molten conductor generated by fusing the cutoff wiring 30 flows out from the opening 28a. This makes it difficult for the molten conductor to stay at the position of the interrupting wiring 30 before fusing, thereby suppressing variations in fusing position and fusing time due to the residence of the molten conductor, and suppressing the deterioration of the interruption performance due to the interrupting wiring 30. can do.

  Further, since the opening 28a is formed so as to expose the most heat-generating part of the interrupting wiring 30, the opening 28a is provided corresponding to the part of the interrupting wiring 30 that is likely to be melted. Can be reliably suppressed, and the deterioration of the interruption performance by the interruption wiring 30 can be reliably suppressed.

  Moreover, the power supply wiring 23 is connected to each connector via the electric wire from the battery 13 that supplies electric power to another electronic control device 12 different from the traction control device 20, and the traction control device 20 and other electronic control devices 20 are connected to each other. A common fuse 14 a for overcurrent protection of the control device 12 is provided on the power supply path from the battery 13. As a result, even if the traction control device 20 provided with the cutoff wiring 30 is short-circuited or the like, the cutoff wiring 30 can be melted to eliminate the influence on the power supply to the other electronic control devices 12. it can.

FIG. 7 is an explanatory diagram illustrating a main part of the traction control device 20 according to the first modification of the first embodiment. FIG. 8 is an explanatory diagram illustrating a main part of the traction control device 20 according to the second modification of the first embodiment. FIG. 9 is an explanatory diagram illustrating a main part of the traction control device 20 according to the third modification of the first embodiment. FIG. 10 is an explanatory diagram showing a main part of the traction control device 20 according to the fourth modification of the first embodiment.
As shown in FIG. 7, as a first modification of the first embodiment, the opening 28 a provided in the solder resist 28 is formed so as to expose a part of the power supply wiring 23 in addition to a part of the cutoff wiring 30. May be. As a result, the molten conductor generated by fusing the cut-off wiring 30 is likely to adhere to a part of the power supply wiring 23 exposed in the opening 28a. Thereby, while restraining retention of a molten conductor, it can suppress that a high temperature molten conductor flows out of the opening 28a, and affects the other electronic components 22. FIG.

  As shown in FIG. 8, as a second modification of the first embodiment, an attachment means (attachment) for adhering (adsorbing) a molten conductor generated by fusing of the cutoff wiring 30 in the vicinity of the cutoff wiring 30. For example, a pair of adhering wires 29 formed of the same wiring material as the power supply wires 23 and the like may be provided as the suction means. As a result, when a high-temperature molten conductor is generated and flows out of the opening 28a when the breaking wiring 30 is melted, the molten conductor is provided close to the breaking wiring 30 when flowing on the surface of the circuit board 21. It adheres to the attachment wiring 29.

  Thereby, the molten conductor is held in a state of adhering to the adhering wiring 29 and loses fluidity by being cured with heat radiation. Accordingly, it is possible to suppress the deterioration of the interruption performance due to the interruption wiring 30 and to suppress the influence on the other electronic components and the like due to the flow of the molten conductor.

  As a third modification of the first embodiment, a plurality of cutoff wirings 30 are provided according to a plurality of electronic components 22, and a plurality of openings 28 a are provided so as to expose a part of these cutoff wirings 30. May be. Specifically, as illustrated in FIG. 9, one cutoff wiring 30 is connected to the land 26a for the electronic component 22a and the power supply wiring 23, and the other cutoff wiring 30 is connected to the land 26b for the electronic component 22b. And the power supply wiring 23. The opening 28a is formed so as to expose a portion near the center of the entire length, which is the portion that generates the most heat in the cutoff wiring 30, to the outside.

  As shown in FIG. 10, as a fourth modification of the first embodiment, the opening 28 a is a cut-off wiring provided between each connection between the array-shaped ceramic capacitor 24 d having a plurality of external electrodes and the power supply wiring 23. A plurality may be provided so that a part of 30 is exposed. The ceramic capacitor 24d is obtained by packaging four multilayer ceramic capacitors as a capacitor array. In this modification, the cutoff wiring 30 is provided between the lands 26 a to 26 d to which the respective external electrodes of the ceramic capacitor 24 d are connected and the power supply wiring 23.

  As described above, even when the openings 28a are respectively formed for the plurality of cutoff wirings 30 provided on the circuit board 21, the molten conductor in each of the cutoff wirings 30 is less likely to stay. Further, it is possible to suppress a decrease in the blocking performance due to each blocking wiring 30 provided on the substrate surface.

[Second Embodiment]
Next, a traction control device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 11 is an explanatory diagram showing a main part of the traction control device 20a according to the second embodiment.

  The second embodiment is mainly different from the first embodiment in that the traction control device 20a employs a blocking wiring 30a instead of the blocking wiring 30. For this reason, substantially the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 11, the cutoff wiring 30a is formed in a meandering shape in order to ensure the wiring length of the cutoff wiring required in a limited mounting area. The opening 28a provided in the solder resist 28 is formed so as to expose the central vicinity of the entire length of the blocking wiring 30a.

  As a result, the blocking wiring 30a can be formed to be elongated even on a highly densified substrate surface, so that it is easy to ensure the necessary wiring length of the blocking wiring 30a. In particular, since the opening 28a is provided in the vicinity of the center where heat is most likely to be generated, even in the case of the interrupting wiring 30a formed in a meandering manner, the retention of the molten conductor is reliably suppressed, and the interruption performance by the interrupting wiring 30a is reduced. It can be surely suppressed. In addition, the structure of the interruption | blocking wiring 30a mentioned above may be employ | adopted for other embodiment and a modification.

[Third Embodiment]
Next, a traction control device according to a third embodiment of the present invention will be described with reference to FIG. FIG. 12 (A) is an explanatory view showing the main part of the traction control device 20b according to the third embodiment, and FIG. 12 (B) is a cross section taken along the line 12B-12B in FIG. 12 (A). FIG.

  The third embodiment is mainly different from the first embodiment in that a second opening 28b is newly formed in the solder resist 28 in the traction control device 20b. For this reason, substantially the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 12A and 12B, the solder resist 28 is formed with a second opening 28b that exposes a region close to the blocking wiring 30 so as to communicate with the opening 28a. Specifically, the second opening 28b is formed in the opening 28a by removing the portion of the solder resist 28 where the wiring portion is not provided in the short direction of the cutoff wiring 30 (the vertical direction in FIG. 12A). It is formed so as to communicate. In FIG. 12, the height of the solder resist 28, that is, the depth of the second opening 28b is, for example, 68 μm, and the thickness of the blocking wiring 30 is, for example, 43 μm.

  For this reason, the molten conductor produced | generated by melt | disconnection of the interruption | blocking wiring 30 will flow into the 2nd opening 28b. Thereby, while restraining retention of a molten conductor, it can suppress that a high temperature molten conductor flows out and affects the other electronic components 22. FIG. The configuration of the second opening 28b described above may be adopted in other embodiments and modifications.

  FIG. 13A is an explanatory view showing a main part of a traction control device 20b according to a first modification of the third embodiment, and FIG. 13B corresponds to the line 13B-13B in FIG. It is sectional drawing by a cut surface. FIGS. 14A to 14C are explanatory views showing a main part of a traction control device 20b according to a second modification of the third embodiment. FIG. 15A is an explanatory view showing a main part of a traction control device 20b according to a third modification of the third embodiment, and FIG. 15B corresponds to the line 15B-15B in FIG. 15A. It is sectional drawing by a cut surface.

  As shown in FIGS. 13A and 13B, as a first modification of the third embodiment, the second opening 28b communicating with the opening 28a may be formed deeper than the opening 28a. Thereby, while staying of a molten conductor can be suppressed, the outflow of the molten conductor which flowed into the 2nd opening 28b can be suppressed.

  As shown in FIG. 14A, as a second modification of the third embodiment, the bottom surface in the region where the second opening 28b and the opening 28a communicate with each other gradually becomes deeper toward the second opening 28b side. Thus, it may be formed in a tapered shape. As shown in FIG. 14B, as a second modification of the third embodiment, the bottom surface in the region where the second opening 28b communicates with the opening 28a gradually becomes deeper toward the second opening 28b side. Thus, the cross section may be formed in a substantially arc shape (R shape). Thereby, while restraining retention of a molten conductor, the molten conductor from the opening 28a can be made to flow suitably in the 2nd opening 28b. Further, as shown in FIG. 14C, a core material 28c for providing the interrupting wire 30 at a shallow position when the interrupting wire 30 is formed is disposed on the inner layer side of the interrupting wire 30 so that the depth of the opening 28a is increased. The second opening 28b may be formed relatively deeper than the opening 28a by reducing the depth.

  Further, as shown in FIGS. 15A and 15B, as a third modification of the third embodiment, an adhesion for adhering a molten conductor generated with the breaking of the cutoff wiring 30 in the second opening 28b. As a means, a part of the power supply wiring 23 and a part of the land 26 may be exposed. For this reason, the molten conductor that has flowed into the second opening 28b from the opening 28a adheres to the part of the power supply wiring 23 and the part of the land 26 that are exposed in the second opening 28b and is deprived of heat. . Thereby, while staying of a molten conductor can be suppressed, the outflow of the molten conductor which flowed into the 2nd opening 28b can be suppressed reliably. It should be noted that both the part of the power supply wiring 23 and the part of the land 26 are not limited to be exposed in the second opening 28b, either one may be exposed in the second opening 28b, An attaching means that can take the heat of the molten conductor such as a wiring member and attach it may be provided in the second opening 28b.

[Fourth Embodiment]
Next, a traction control device according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 16 is an explanatory diagram showing a main part of the traction control device 20c according to the fourth embodiment.

  The fourth embodiment is mainly different from the first embodiment in that the cutoff wiring 30 is connected to the power supply wiring 23 and the land 26 via the connection wirings 40 and 50. For this reason, substantially the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 16, the cut-off wiring 30 is electrically connected to the power supply wiring 23 through one side connection wiring 40 at one end, and the land 26 through the other side connection wiring 50 at the other end. Is electrically connected. The one side connection wiring 40 and the other side connection wiring 50 are formed of a conductive material such as copper, which is the same as that of the cutoff wiring 30 and the power supply wiring 23, so that the conductor volume is larger than that of the cutoff wiring 30.

  Specifically, as shown in FIG. 16, the one-side connection wiring 40 is formed in a substantially arc shape (R-shape) so that the wiring width becomes wider toward the power supply wiring 23 side. The cross-sectional area S1a at the connection site is smaller than the cross-sectional area S1b at the connection site with the power supply wiring 23 to be connected. Further, the other-side connection wiring 50 is formed in a substantially arc shape (R-shape) so that the wiring width becomes wider toward the land 26 side, so that the cross-sectional area S2a at the connection portion with the cutoff wiring 30 is connected. It is comprised so that it may become smaller than cross-sectional area S2b in a connection part with the land 26 which is.

  For this reason, when the heat generated in the cut-off wiring 30 due to overcurrent is transmitted to the power supply wiring 23 and the land 26 via the one-side connection wiring 40 and the other-side connection wiring 50, the heat is directly transmitted to the power supply wiring 23 and the land 26. As compared with the above, it is possible to prevent the heat necessary for the disconnection wiring to the power supply wiring 23 and the land 26 from being melted out. Thereby, since the variation in the temperature rise in the interruption | blocking wiring 30 is suppressed, the fall of the interruption | blocking performance by the interruption | blocking wiring 30 provided in the board | substrate surface densified can be suppressed. In particular, the heat generated in the cut-off wiring 30 due to the overcurrent is gradually diffused in the other side connection wiring 50 and is widely transmitted to the land 26. Therefore, the local temperature rise in the land 26 is also alleviated. Thereby, even when a solder having a relatively low melting point is used for the land 26, the melting of the solder due to the heat from the interrupt wiring 30 can be suppressed. Moreover, since the one side connection wiring 40 and the other side connection wiring 50 have a larger conductor volume than the cutoff wiring 30, heat from the cutoff wiring 30 can be suitably stored.

  In particular, the one side connection wiring 40 is formed so that the side edge thereof is gently continuous with the side edge of the blocking wiring 30 and gradually spreads toward the power supply wiring 23. As described above, since the side edges of the cutoff wiring 30 and the one-side connection wiring 40 are smoothly continuous, when the wirings 30 and 40 are formed using an etching solution, the side edges of the cutoff wiring 30 and one side are formed. The etching solution easily flows uniformly at the connection portion with the side edge of the connection wiring 40. Thereby, the retention of the etching solution at the connection portion is suppressed, and the variation in the wiring width of the cutoff wiring 30 is suppressed. Therefore, it is possible to suppress a reduction in the cutoff performance due to the cutoff wiring 30 provided on the substrate surface. In addition, the structure of the one side connection wiring 40 and the other side connection wiring 50 with respect to the interruption | blocking wiring 30 mentioned above may be employ | adopted for other embodiment and a modification.

[Fifth Embodiment]
Next, a traction control device according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 17 is an explanatory diagram showing a main part of a traction control device 20d according to the fifth embodiment.

  In the fifth embodiment, the traction control device 20d mainly employs the one-side connection wiring 40a and the other-side connection wiring 50a in place of the one-side connection wiring 40 and the other-side connection wiring 50. And different. For this reason, the same reference numerals are given to substantially the same components as those in the fourth embodiment, and the description thereof will be omitted.

  As shown in FIG. 17, the one-side connection wiring 40 a includes a heat holding part 41 that is a part in the vicinity of the cutoff wiring 30 and a throttle part 42 that is a part in the vicinity of the power supply wiring 23. In the narrowed portion 42, the total cross-sectional area S3a of the connection portion with the power supply wiring 23 in the one-side connection wiring 40a is larger than the cross-sectional area on the center side of the one-side connection wiring 40a, that is, the cross-sectional area S3b of the heat holding portion 41. It is formed small so that it can be squeezed.

  Similarly to the one-side connection wiring 40a, the other-side connection wiring 50a also includes a heat holding part 51 that is a part in the vicinity of the blocking wiring 30 and a throttle part 52 that is a part in the vicinity of the land 26. In the narrowed portion 52, the total cross-sectional area S4a of the connection portion with the land 26 in the other-side connection wiring 50a is larger than the cross-sectional area on the center side of the other-side connection wiring 50a, that is, the cross-sectional area S4b of the heat holding portion 51. It is formed small so that it can be squeezed.

  For this reason, the heat transmitted to the one-side connection wiring 40 a via the cutoff wiring 30 becomes difficult to be transmitted from the throttle section 42 to the power supply wiring 23, and is stored in the heat holding section 41. Thus, since the heat from the interruption wiring 30 is stored in the heat holding part 41, the temperature of the heat holding part 41 at the time of interruption is maintained at a relatively high temperature. It is suppressed and the fall of the interruption | blocking performance by the interruption | blocking wiring 30 can be suppressed reliably. With respect to the other-side connection wiring 50a configured in the same manner as the one-side connection wiring 40a, it is possible to reliably suppress a decrease in the interruption performance due to the interruption wiring 30.

  In particular, by setting the cutoff wiring 30, the one-side connection wiring 40a, and the other-side connection wiring 50a to a predetermined shape, material, etc., the cutoff conditions are uniquely determined so that variations are suppressed. And the one-side connection wiring 40a and the other-side connection wiring 50a can be universally applied as one combination. Moreover, since the heat storage amount of the one side connection wiring 40a and the other side connection wiring 50a can be controlled by changing the volumes of the heat holding portions 41 and 51, the fusing timing of the cutoff wiring 30 can be easily adjusted.

  In addition, since the one side connection wiring 40 a is formed as a throttle portion 42 by constricting two portions connected to the power supply wiring 23, heat from the cutoff wiring 30 is transmitted to the power supply wiring 23 via both throttle portions 42. Even in such a case, it is distributed by both the throttle portions 42 and transmitted to the power supply wiring 23. For this reason, the local temperature rise in the power supply wiring 23 can be reduced. The local temperature rise in the land 26 can be alleviated with respect to the other side connection wiring 50a configured similarly to the one side connection wiring 40a.

  Note that the two narrowed portions 42 and 52 provided in the one-side connection wiring 40a and the other-side connection wiring 50a are not limited to two, and may be three or more. Further, depending on the blocking condition, one throttle part 42, 52 may be provided. In addition, the structure of the one side connection wiring 40a and the other side connection wiring 50a with respect to the interruption | blocking wiring 30 mentioned above may be employ | adopted for other embodiment and a modification.

[Sixth Embodiment]
Next, a traction control device according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 18 is an explanatory diagram showing a main part of a traction control device 20e according to the sixth embodiment.

  The sixth embodiment is mainly different from the first embodiment in that in the traction control device 20e, a heat radiation portion 29a is newly provided for the power supply wiring 23. For this reason, substantially the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 18, the heat radiating portion 29 a is a wiring made of the same material as the power supply wiring 23, and is a plurality of other than the electronic component 22 (the ceramic capacitor 24 in this embodiment) connected to the cutoff wiring 30. It is arranged so as to be connected to the power supply wiring 23 at a position where the wiring distance is shorter than the electronic component 22 with respect to the cutoff wiring 30.

  For this reason, when the heat generated in the interruption wiring 30 due to the overcurrent is transmitted to the power supply wiring 23, the heat is transmitted to the adjacent heat radiating portion 29a and radiated. Thereby, the heat generated in the cutoff wiring 30 can be made difficult to be transmitted to the other electronic components 22 connected to the power supply wiring 23. Note that the heat radiating portion 29a is not limited to being formed in a wiring shape, and may be formed of, for example, a conductive portion formed inside an interlayer connection portion provided on the substrate. In addition, the structure of the thermal radiation part 29a mentioned above may be employ | adopted for other embodiment and a modification.

FIG. 19 is an explanatory diagram showing a main part of a traction control device 20e according to a first modification of the sixth embodiment.
As shown in FIG. 19, as a first modification of the sixth embodiment, in the vicinity of the interruption wiring 30, instead of the heat radiating portion 29 a, thermal diffusion that diffuses heat generated by overcurrent in the interruption wiring 30. As a member, for example, a thermal diffusion wiring 29b formed of the same wiring material as the power supply wiring 23 may be formed. Thereby, when the heat generated by the overcurrent is transmitted to the surroundings, it is diffused by the thermal diffusion wiring 29b provided in the vicinity of the cutoff wiring 30 that is a heat source, so that other heat to be protected from heat. Heat transfer to the electronic component 22 is suppressed. Thereby, while the fall of the interruption | blocking performance by the interruption | blocking wiring 30 (the dispersion | variation and increase of a fusing time and interruption | blocking current) is suppressed, normal operation | movement of the said other electronic component 22 can be maintained.

[Seventh Embodiment]
Next, a traction control device according to a seventh embodiment of the present invention will be described with reference to FIG. FIG. 20 is an explanatory diagram showing a main part of a traction control device 20f according to the seventh embodiment.
In the seventh embodiment, in order to increase the density by adopting a cut-off line 30b instead of the cut-off line 30, the power supply line 23 is arranged between the lands 26 to which both external electrodes 24a of the ceramic capacitor 24 are connected. This is mainly different from the first embodiment. For this reason, substantially the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 20, the cutoff wiring 30b is formed by connecting a first wiring portion 31 and a second wiring portion 32 having a wiring length shorter than the first wiring portion 31 at a predetermined angle. The predetermined angle is set to 90 °, for example, so that the first wiring portion 31 is connected to the power supply wiring 23 and the second wiring portion 32 is connected to the land 26. The opening 28a is formed so as to expose a portion in the vicinity of the center of the entire length, which is the portion that generates the most heat, of the blocking wiring 30b.

  By bending the cut-off wiring 30b in this way, it is possible to increase the length of the wiring while connecting the adjacent power supply wiring 23 and the land 26 as compared to the case where the cut-off wiring is formed in a straight line. it can. As a result, it becomes easy to secure the necessary wiring length of the cutoff wiring 30b even in a limited mounting area, so that it is possible to suppress a reduction in cutoff performance due to the cutoff wiring 30b and to reduce the size of the apparatus.

  In the present embodiment, the first wiring portion 31 is connected to the power supply wiring 23 and the second wiring portion 32 is connected to the land 26. However, the present invention is not limited to this, and the first wiring portion 31 is connected to the land 26. Then, the second wiring portion 32 may be connected to the power supply wiring 23. Further, the predetermined angle may be set according to the positions of the adjacent power supply wiring 23 and land 26. Further, the cut-off wiring 30b may be connected to the power supply wiring 23 via the above-described one-side connection wiring 40, or may be connected to the land 26 via the above-described other-side connection wiring 50. Moreover, the structure of the interruption | blocking wiring 30b mentioned above may be employ | adopted for other embodiment and a modification.

[Eighth Embodiment]
Next, an electronic control unit according to an eighth embodiment of the present invention will be described with reference to FIG. FIG. 21 is an explanatory diagram illustrating a main part of the electronic control device 110 according to the eighth embodiment.
In the electronic control device 110 according to the eighth embodiment, a circuit block 130 in which the functions of the traction control device 20 according to the first embodiment are formed into circuit blocks on the same substrate 120, and further functions are circuit blocks. The circuit blocks 140 and 150 are arranged. The other function is a function that is more important than the function of the circuit block 130, for example, a function corresponding to the engine ECU or a function corresponding to the brake ECU. The circuit block 140 is connected to the engine ECU. Corresponding functions are configured as circuit blocks, and the circuit block 150 is configured by converting functions corresponding to the brake ECU into circuit blocks.

  As shown in FIG. 21, the power supply wiring 23 for supplying power from the battery 13 through the connector 121 is electrically connected to the circuit blocks 130, 140, and 150 through the branch wirings 131, 141, and 151, respectively. It is connected. The interruption wiring 30 described above is arranged on the branch wiring 131 of the circuit block 130 so as to function as overcurrent protection for the circuit block 130. On the power supply wiring 23, a cutoff wiring 122 that functions as overcurrent protection for the substrate 120 is provided. That is, on the substrate 120, two blocking wires are provided, that is, a blocking wire 122 that protects the substrate 120 including all the circuit blocks 130 to 150 and a blocking wire 30 that protects the circuit block 130.

  As a result, an overcurrent occurs due to a short circuit failure or the like in the circuit block 130 in which the interruption wiring 30 is provided. Even when the interruption wiring 30 is melted, the other circuit blocks 140 and 150 are connected via the branch wirings 141 and 151. Since the connection with the power supply wiring 23 is maintained, the function of only the circuit block 130 having the blown cut-off wiring 30 can be stopped, and the functions of the other circuit blocks 140 and 150 can be continued. In particular, since the function of the circuit block 130 is less important than the other circuit blocks 140 and 150, the function stop of the less important circuit block 130 affects the functions of the circuit blocks 140 and 150 having higher importance. Can be suppressed. Even if an overcurrent occurs due to a short circuit failure or the like in the circuit blocks 140 and 150 where the interruption wiring 30 is not provided, the interruption wiring 122 is melted by the overcurrent flowing through the power supply wiring 23, and the circuit blocks 130 and 140. , 150 stops, it is possible to suppress the generated overcurrent from flowing to other circuit blocks.

In particular, by forming the cut-off wiring 30 so that the current value at the time of cut-off with respect to the cut-off wiring 122 is reduced, an overcurrent is caused in the circuit block 130 provided with the cut-off wiring 30 due to a short circuit failure or the like. When this occurs, the interruption wiring 30 is surely fused faster than the interruption wiring 122. Thereby, the influence on the other circuit blocks 140 and 150 can be reliably suppressed.
In addition, the structure which provides two interruption | blocking wiring on one board | substrate in this embodiment may be employ | adopted for other embodiment and a modification.

In addition, this invention is not limited to said each embodiment and its modification, You may actualize as follows.
(1) The interruption wiring 30 and the other interruption wiring in which the opening 28a is formed are electrically connected to the common wiring shared by the electronic components 22 that are the target of overcurrent protection, instead of the power supply wiring 23. It may be connected.

(2) The above-described cutoff wiring 30 and other cutoff wirings in which the opening 28a is formed are not limited to being electrically connected to the land 26, and are, for example, an inner layer protected by a protective film such as a solder resist and not exposed. It may be electrically connected to a component mounting wiring for mounting an electronic component such as a side wiring.

(3) The above-described cutoff wiring 30 in which the opening 28a is formed and the other cutoff wiring are overcurrent protection for a plurality of electronic control devices 12 such as the above-described engine ECU, brake ECU, steering ECU, body ECU, navigation device, and the like. For each substrate, it may be adopted.

(4) A part or all of the interruption wiring 30 may be formed of a material having a lower thermal conductivity than the power supply wiring 23 and the land 26, such as aluminum. As a result, the heat generated in the interruption wiring 30 due to the overcurrent is less likely to be transmitted to the power supply wiring 23 and the land 26, so that variations in temperature rise in the interruption wiring 30 are suppressed, and the interruption performance due to the interruption wiring 30 is reliably reduced. Can be suppressed. The same effect is obtained with respect to the other cutoff wirings 30a and 30b.

DESCRIPTION OF SYMBOLS 10 ... Automobile 11 ... Vehicle control system 12 ... Electronic control device 13 ... Battery 14a, 14b ... Fuse 20, 20a-20f ... Traction control device (electronic control device)
DESCRIPTION OF SYMBOLS 21 ... Circuit board 22 ... Electronic component 23 ... Power supply wiring 24 ... Ceramic capacitor (electronic component)
26 ... Land (component mounting wiring)
28 ... Solder resist (protective layer)
28a ... Opening 28b ... Second opening 29 ... Adhesion wiring 29a ... Heat radiation part 29b ... Heat diffusion wiring 30, 30a, 30b ... Cut-off wiring 40,40a ... One side connection wiring 50,50a ... Other side connection wiring

Claims (16)

At least one overcurrent protection interruption wiring is provided between the wiring for connecting the component mounting wiring on which the plurality of electronic components are mounted and connected on the substrate and the common wiring shared by the plurality of electronic components. An electronic control device provided,
The cut-off wiring is a wiring that cuts off the connection through the cut-off wiring by fusing according to heat generated by overcurrent,
The substrate is provided with a protective layer covering the substrate surface including the blocking wiring,
The electronic control device according to claim 1, wherein an opening for exposing a part of the blocking wiring is formed in the protective layer.   The electronic control device according to claim 1, wherein the opening is formed so as to expose a portion of the cut-off wiring that generates the most heat.   The electronic control device according to claim 1, wherein the opening is formed to expose a part of the shared wiring in addition to a part of the blocking wiring. A plurality of the cut-off wirings are provided according to the plurality of electronic components,
The electronic control device according to any one of claims 1 to 3, wherein a plurality of the openings are provided so as to expose a part of each of the cut-off wirings.   5. The electronic control according to claim 1, wherein a second opening that exposes a region close to the blocking wiring is formed in the protective layer so as to communicate with the opening. apparatus.   The electronic control device according to claim 5, wherein the second opening is formed deeper than the opening.   The electronic control device according to claim 6, wherein a bottom surface in a region where the second opening and the opening communicate with each other is formed so as to gradually become deeper toward the second opening side.   The electronic control device according to any one of claims 5 to 7, wherein in the second opening, an attaching unit is provided for attaching a molten conductor generated with the cutting of the cutoff wiring.   The electronic control device according to any one of claims 1 to 7, wherein an adhesion means for adhering a molten conductor generated by fusing of the cutoff wiring is provided in the vicinity of the cutoff wiring. The cutoff wiring is connected via a connection wiring to at least one of the shared wiring and the component mounting wiring.
The said connection wiring is formed so that the cross-sectional area in the connection site | part with the said interruption | blocking wiring may become smaller than the cross-sectional area in the connection site | part with the said connection object. The electronic control device according to one item.   11. The electronic control device according to claim 10, wherein the connection wiring is formed small so that a cross-sectional area of a connection portion with the connection target is narrowed with respect to a cross-sectional area on a central side of the connection wiring. .   In the shared wiring, a heat radiating portion made of the same material as the shared wiring is formed at a position where the wiring distance is shorter with respect to the blocking wiring than a plurality of other electronic components other than the electronic components connected to the blocking wiring. The electronic control device according to any one of claims 1 to 11, wherein the electronic control device is used.   The electronic control according to any one of claims 1 to 12, wherein a thermal diffusion wiring for diffusing heat generated by overcurrent in the cutoff wiring is formed in the vicinity of the cutoff wiring. apparatus. The cutoff wiring is formed by connecting a first wiring portion and a second wiring portion having a wiring length shorter than the first wiring at a predetermined angle,
2. The predetermined angle is set such that one of the first wiring portion and the second wiring portion is connected to the shared wiring and the other is connected to the component mounting wiring. The electronic control apparatus as described in any one of -13.   The electronic control device according to claim 1, wherein the shared wiring is a power supply wiring. The power supply wiring is connected to a power supply that supplies power to another device different from the electronic control device,
The electronic control device according to claim 15, wherein a common fuse for protecting the electronic control device and the other device is provided on a power supply path from the power supply.

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