JP2004236429A - Electrical apparatus for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical apparatus for a vehicle capable of efficiently radiating the heat generated from a boosting coil of a switching converter to the outside. <P>SOLUTION: In this electrical apparatus 10, the boosting coil 16 is stored in a recessed portion 21 formed on an aluminum plate 20 of an aluminum case 11 and filled with an impregnant 25, so that the heat generated from the boosting coil 16 is transferred to the aluminum plate 20 through the impregnant 25. Therefore, the heat generated from the boosting coil 16 can be dissipated more efficiently to the outside of the aluminum case 11 than in a conventional apparatus. An insulating member 22 is laid on the inner surface of the recessed portion 21, so that the pressure rising coil 16 and the aluminum board 20 can be surely insulated. Furthermore, the boosting coil 16 is pushed against the inner surface of the recessed portion 21 (specifically, the insulating member 22 laid on the inner surface of the recessed portion 21), thus improving heat transfer efficiency from the boosting coil 16 to the aluminum case 11. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric device for a vehicle having a boosting type switching converter inside an aluminum case.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an ECU for driving and controlling an actuator has been known as this kind of electric equipment for a vehicle. In this type of ECU, a switching converter for boosting the output of a battery and outputting the boosted output to an actuator is mounted on a circuit board, and the circuit board is covered with an aluminum case.
[0003]
In addition, the prior art document which concerns on this invention could not be found.
[0004]
[Problems to be solved by the invention]
By the way, the load on the ECU increases with the advancement of the functions of the automobile, and the amount of heat generated from the boosting coil of the switching converter is increasing. In the conventional device, heat is trapped in the space between the booster coil mounted on the circuit board and the aluminum case, and the heat generated by the booster coil cannot be efficiently radiated to the outside of the aluminum case.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric device for a vehicle that can efficiently radiate heat generated from a boosting coil of a switching converter to the outside.
[0006]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an automotive electrical apparatus including a boosting type switching converter inside an aluminum case, wherein the aluminum plate forming the aluminum case is provided. Is characterized in that a recess is formed in the inner surface of the switch, the booster coil of the switching converter is housed in the recess, and the impregnation agent is filled.
[0007]
According to a second aspect of the present invention, in the electric appliance for an automobile according to the first aspect, the boosting coil is pressed against the inner surface of the recess by a bolt screwed to the inner wall of the recess.
[0008]
According to a third aspect of the present invention, in the electric appliance for a vehicle according to the first or second aspect, an insulating member is laid on an inner surface of the recess.
[0009]
According to a fourth aspect of the present invention, in the electric device for an automobile according to any one of the first to third aspects, the circuit board is laid on the inner surface of the aluminum plate to close the recess, and the terminal of the step-up coil is connected to the circuit board. And is connected to a circuit on a circuit board.
[0010]
According to a fifth aspect of the present invention, there is provided an electric appliance for a vehicle, comprising a step-up switching converter inside an aluminum case, wherein a circuit pattern is formed on an insulating layer laminated on one surface of a metal plate. A step-up coil of a switching converter is mounted on an insulating layer of the metal circuit board, and a side surface of the step-up coil is adhered to the insulating layer, and the side of the metal circuit board opposite to the insulating layer is provided. The feature is that the surface is closely adhered to the inner surface of the aluminum plate constituting the aluminum case.
[0011]
Function and effect of the present invention
<Invention of claim 1>
In the electric appliance for an automobile according to the first aspect, the step-up coil is housed in the recess formed in the aluminum plate of the aluminum case and filled with the impregnating agent. The heat of the step-up coil is transmitted to the outside of the aluminum case more efficiently than the conventional case.
[0012]
<Invention of Claim 2>
According to the second aspect of the present invention, since the step-up coil is pressed against the inner surface of the recess, the electric heating efficiency from the step-up coil to the aluminum case can be improved.
[0013]
<Invention of Claim 3>
According to the third aspect of the present invention, since the insulating member is laid on the inner surface of the recess, the insulation between the step-up coil and the aluminum plate can be reliably ensured.
[0014]
<Invention of Claim 4>
Since the circuit board is laid on the inner surface of the aluminum plate, heat transmitted to the circuit board can be radiated to the outside from the aluminum plate. Further, since the recess is closed by the circuit board, the step-up coil is stabilized in the recess.
[0015]
<Invention of claim 5>
In the automobile electric device according to the fifth aspect, since the side surface of the boosting coil is brought into close contact with the insulating layer of the metal circuit board, the heat of the boosting coil can be efficiently released to the metal circuit board. Then, the heat of the metal circuit board can be radiated from the aluminum plate to the outside.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
<First embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows an electrical configuration of an electric device 10 for a vehicle according to the present embodiment. The electric appliance for a vehicle 10 includes a power supply filter 13, a boosting switching converter 14, and an inverter circuit 15 inside an aluminum case 11. A connector 12 is provided on an outer surface of the aluminum case 11, and a terminal of an electric wire extending from a battery 50 of the vehicle is connected to the connector 12. The output of the battery 50 is applied to the boosting switching converter 14 through the power supply filter 13.
[0017]
The step-up switching converter 14 is a known step-up circuit including a step-up coil 16, an FET 17, and a diode 18. An inverter circuit 15 is connected to an output side of the step-up switching converter 14. The output of the inverter circuit 15 is connected to an actuator (not shown) provided in the vehicle.
[0018]
FIG. 2 shows an enlarged view of the structure around the boosting coil 16 in the boosting switching converter 14. In FIG. 1, reference numeral 20 denotes an aluminum plate constituting the aluminum case 11, and a recess 21 according to the present invention is formed on an inner surface of the aluminum plate 20. An insulating member 22 (for example, a rubber sheet, an insulating resin sheet, or the like) is laid on the inner surface (the bottom surface and the inner side surface) of the recess 21. The step-up coil 16 is accommodated in the recess 21, and the side surface of the step-up coil 16 is in close contact with the inner surface of the recess 21 (specifically, the insulating member 22 laid on the inner surface of the recess 21).
[0019]
More specifically, the boosting coil 16 is formed by winding an electric wire around, for example, an annular core 16A. Then, the head of the bolt 26 penetrating the core 16A is pressed against a part of the step-up coil 16, and the bolt 26 penetrates the insulating member 22 and is screwed to the bottom wall of the recess 21. Thus, the side surface of the step-up coil 16 is in a state of being in close contact with the insulating member 22. The recess 21 is filled with the impregnating agent 25 in a state in which the step-up coil 16 is housed.
[0020]
A circuit board 23 is laid on the inner surface of the aluminum plate 20. By screwing the bolt 26 to the aluminum plate 20, the coil 16 is fixed to the aluminum plate 20. Then, the recess 21 was closed by the circuit board 23, and the terminal portion of the step-up coil 16 was formed on the surface of the circuit board 23 opposite to the aluminum plate 20 through the hole formed in the circuit board 23. Soldered or welded to the electric circuit 51.
[0021]
In the electric appliance for a vehicle 10 of the present embodiment, the recess 21 formed in the aluminum plate 20 of the aluminum case 11 contains the boosting coil 16 and is filled with the impregnating agent 25, so that the heat generated from the boosting coil 16 is generated. Is transmitted to the aluminum plate 20 through the impregnating agent 25, and the heat from the step-up coil 16 can be released to the outside of the aluminum case 11 more efficiently than the conventional one. Further, since the insulating member 22 is laid on the inner surface of the recess 21, the insulation between the boosting coil 16 and the aluminum plate 20 can be reliably ensured. Furthermore, since the boosting coil 16 is pressed against the inner surface of the recess 21 (specifically, the insulating member 22 laid on the inner surface of the recess 21), the electric heating efficiency from the boosting coil 16 to the aluminum case 11 is improved. In addition, since the circuit board 23 is laid and fixed on the inner surface of the aluminum plate 20, heat transmitted to the circuit board 23 can be radiated to the outside from the aluminum plate 20. In addition, since the recess 21 is closed by the circuit board 23, the step-up coil 16 is stabilized in the recess 21.
[0022]
<Second embodiment>
This embodiment is shown in FIG. 3, and only the configuration different from the first embodiment will be described below. In FIG. 3, reference numeral 30 denotes a metal circuit board, which has a structure in which an insulating layer 32 is laminated on one surface of a metal plate 31 and the insulating layer 32 includes a circuit pattern 33. The step-up coil 16 is mounted on the insulating layer 32 of the metal circuit board 30. The terminal of the step-up coil 16 is connected to a flat terminal 16T, and the terminal 16T is overlapped with the circuit pattern 33 and fixed with bolts. As a result, the step-up coil 16 is electrically connected to the circuit pattern 33, and the side surface of the step-up coil 16 is held in close contact with the insulating layer 32 of the metal circuit board 30.
[0023]
Further, the metal circuit board 30 is fixed with bolts in a state where the surface opposite to the insulating layer 32 is in close contact with the inner surface of the aluminum plate 20 constituting the aluminum case 11.
[0024]
According to the present embodiment, since the side surface of the step-up coil 16 is brought into close contact with the insulating layer 32 of the metal circuit board 30, the heat of the step-up coil 16 can be efficiently released to the metal circuit board 30. The heat of 30 can be radiated from the aluminum plate 20 to the outside.
[0025]
<Other embodiments>
The present invention is not limited to the above-described embodiments. For example, the following embodiments are also included in the technical scope of the present invention, and furthermore, various embodiments may be made without departing from the spirit of the present invention. It can be changed and implemented.
(1) In the first embodiment, the insulating member 22 is laid on the inner surface of the recess 21. However, a structure in which the side surface of the step-up coil 16 is directly attached to the recess 21 may be used.
[0026]
(2) In the second embodiment, the state in which the terminal of the step-up coil 16 is superimposed on the circuit pattern 33 is held by the bolt, but the terminal of the step-up coil 16 is superposed on the circuit pattern 33 and soldered. It may be.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of an electric device for a vehicle according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view showing a heat dissipation structure of the electric device for a vehicle; FIG. Sectional view showing heat dissipation structure
DESCRIPTION OF SYMBOLS 10 ... Automotive electrical equipment 11 ... Aluminum case 14 ... Step-up switching converter 16 ... Step-up coil 20 ... Aluminum plate 21 ... Depression 22 ... Insulating member 23 ... Circuit board 25 ... Impregnating agent 30 ... Metal circuit board 31 ... Metal plate 32 ... insulating layer

Claims (5)

An automotive electrical device having a boost type switching converter inside an aluminum case,
An electric device for an automobile, wherein a recess is formed in an inner surface of an aluminum plate constituting the aluminum case, and the recess accommodates a boosting coil of the switching converter and is filled with an impregnating agent. The automotive electric device according to claim 1, wherein the step-up coil is pressed against an inner surface of the recess by a bolt screwed to an inner wall of the recess. The electric device for a vehicle according to claim 1 or 2, wherein an insulating member is laid on an inner surface of the recess. The circuit board is laid on the inner surface of the aluminum plate to close the recess, and a terminal of the step-up coil is passed through the circuit board to be connected to a circuit on the circuit board. Item 4. An electric device for a vehicle according to any one of Items 1 to 3. An automotive electrical device having a boost type switching converter inside an aluminum case,
A metal circuit board formed by forming a circuit pattern on an insulating layer laminated on one surface of a metal plate,
A step-up coil of the switching converter is mounted on the insulating layer of the metal circuit board, and a side surface of the step-up coil is brought into close contact with the insulating layer,
An electric device for automobiles, wherein a surface of the metal circuit board opposite to the insulating layer is closely attached to an inner surface of an aluminum plate constituting the aluminum case.

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