KR102162957B1 - power steering system controller - Google Patents

Abstract

The electric steering apparatus controller according to the present embodiment includes a housing having both ends open and an inner space portion; A printed circuit board installed in the space formed in the housing; A heat dissipating unit installed to close one opening of the housing and dissipating heat generated from the printed circuit board to the outside of the housing; A cover member coupled to the other opening of the housing in which the heat dissipation unit is installed; And at least one of the inner circumferential surface of the housing and the surface facing the printed circuit board of the cover member, and shielding the electromagnetic waves of the printed circuit board while discharging heat from the printed circuit board to the outside of the housing. Unit; may include.

Description

Electric steering system controller

The present invention relates to an electric steering apparatus controller with improved heat dissipation and shielding structure.

In general, MDPS (Motor Driven Power Steering), an electric steering device, is a device that assists the driver's steering with motor power without using hydraulic pressure. To this end, MDPS is equipped with a motor that generates power by ECU control, a worm-shaft rotated through the motor, and a worm wheel meshed therewith, so that the rotational force of the worm wheel is transferred to the gearbox. Transmission to help the driver steer the wheel without too much effort. MDPS is equipped with a controller MDPS ECU, it is possible to control the operating environment of the MDPS by grasping the driving state of the vehicle.

MDPS ECU is a housing, a printed circuit board equipped with a FET (Field Effect Transistor), a heat sink unit that emits heat generated from the FET, and the housing is combined to protect the printed circuit board. It consists of a cover member forming the exterior. FET is an electronic component that generates high-temperature heat by passing a large amount of current to obtain a large output with a small input. Therefore, the heat generated by the heat dissipation unit is dissipated to the outside as much as possible. Therefore, conventionally, the FET is soldered on a metal PCB (Metal PCB) to dissipate heat generated from the FET to the outside, and the metal PCB is screwed into a housing coated with heat radiation grease to improve heat dissipation.

However, there is a disadvantage in that the above-described structural improvement alone does not effectively dissipate heat generated by the FET. In other words, conventionally, MDPS ECU has a structure in which the FET is simply wrapped and protected by a plastic housing and cover without a separate heat dissipation and shielding structure, so the electromagnetic wave performance (RE) is weak, the heat generation performance is poor, and the cracking (crack), rust, etc. can cause quality problems.

The present embodiment provides an electric steering system controller with an improved structure to improve heat dissipation performance and reliability and performance of an ECU by disposing a shielding unit capable of heat dissipation and electromagnetic wave shielding on an inner wall and a cover of a plastic housing.

The electric steering apparatus controller according to the present embodiment includes a housing having both ends open and an inner space portion; A printed circuit board installed in the space formed in the housing; A heat dissipating unit installed to close one opening of the housing and dissipating heat generated from the printed circuit board to the outside of the housing; A cover member coupled to the other opening of the housing in which the heat dissipation unit is installed; And at least one of the inner circumferential surface of the housing and the surface facing the printed circuit board of the cover member, and shielding the electromagnetic waves of the printed circuit board while discharging heat from the printed circuit board to the outside of the housing. Unit; may include.

The shielding unit includes a first shielding member installed on an inner circumferential surface of the housing; And a second shielding member installed on an inner surface of the cover member facing the printed circuit board.

The shielding unit may be formed of a metal material, and may be formed of an aluminum alloy material.

The first shielding member and the second shielding member may be in contact with each other so as to be energized at an assembly position of the housing and the cover member.

The first shielding member may further include an elastic plate integrally extended and bent at an end of the first shielding member facing the heat dissipating unit to make surface contact with the heat dissipating unit.

In this case, the elastic plate may serve as a ground for the printed circuit board through contact with the heat dissipation unit.

The elastic plate may be fixedly coupled to the heat dissipation unit by a fastening member.

The first shielding member further includes an inclined surface having a predetermined angle so as to face the outside of the housing on a surface facing the cover member, and the second shielding member is an inner surface of the first shielding member along the inclined surface Can be contacted.

The second shielding member may be fixedly coupled by the cover member and the fastening member.

According to the present embodiment as described above, by installing the shielding unit inside the housing and the cover member of the electric steering device controller, it is possible to improve the electromagnetic wave shielding and heat dissipation function.

In addition, since the elastic plate provided in the shielding unit is formed of a material that can be elastically deformable with the grounding function of the printed circuit board, it is possible to minimize the vibration of the heat dissipation unit due to the inflow of external vibration, and thus can be generated in the housing by transmission of external vibration. Structural stability, such as cracks, can be improved.

1 is an exploded perspective view of an electric steering device controller according to the present embodiment;
2 is a cross-sectional view of the electric steering apparatus according to the present embodiment, an enlarged view of a coupling portion of a housing and a cover member;
3 is a cross-sectional view of the electric steering apparatus according to the present embodiment, an enlarged view of a coupling portion between a housing and a heat dissipation unit;
4 is a view showing a second shielding member installed on the cover member, and,
5 is a cross-sectional perspective view showing an elastic plate of the first shielding member fixed to the heat dissipation unit.

Hereinafter, an electric steering apparatus controller according to the present embodiment will be described with reference to the drawings. The accompanying drawings show exemplary forms of the present invention, which are only provided to describe the present invention in more detail, and thus the technical scope of the present invention is not limited thereto.

In addition, regardless of the reference numerals, identical or corresponding components are given the same reference numbers, and duplicate descriptions thereof will be omitted, and the size and shape of each component member shown for convenience of explanation may be exaggerated or reduced. have.

Meanwhile, terms including ordinal numbers such as first or second may be used to describe various components, but the components are not limited by the terms, and the terms refer to one component from another component. It is used only for distinguishing purposes.

1 is an exploded perspective view of an electric steering apparatus controller according to the present embodiment, FIG. 2 is a cross-sectional view of the electric steering apparatus according to the present embodiment, an enlarged view of a coupling portion of a housing and a cover member, and FIG. 3 is As a cross-sectional view of the electric steering device according to the enlarged view of the coupling portion of the housing and the heat dissipation unit, Fig. 4 is a view showing a second shielding member installed on the cover member, and Fig. It is a cross-sectional perspective view showing the elastic plate of the member.

Referring to FIG. 1, the electric steering apparatus controller 100 of the present invention is an MDPS ECU that controls Motor Driven Power Steering (MDPS). According to this embodiment, the electric steering device controller 100 may include a housing 110, a printed circuit board 120, a heat dissipation unit 130, a cover member 140, and a shielding unit 150.

The housing 100 has a printed circuit board 120 installed in the inner space, and may be formed of a resin material. At least one rib member is formed outside the housing 100 to minimize the occurrence of cracks due to an external impact, and to reduce internal heat by maximizing a contact area with external air.

The housing 100 may be provided in various shapes, but may be provided in a rectangular frame shape as shown for example. In this case, both ends except the periphery may form an open opening, and the opening may be sealed with a heat dissipation unit 130 and a cover member 140 to be described later.

The printed circuit board 120 transmits external power to a power member so as to secure noise filtering and power safety, and may include a power board 122 and a main board 124.

A FET 121 (Field Effect Transistor) may be mounted on the power substrate 122, and a plurality of passive and active elements may be installed on the main board 124 to perform motor driving control.

The heat dissipation unit 130 may discharge heat generated from the printed circuit board 120 to the outside, and may be formed of a material having excellent thermal conductivity. For example, according to this embodiment, it may be formed of an aluminum alloy material. At least one or more cooling fins may be integrally formed in the heat dissipation unit 130, and heat generated from the FET 121 mounted on the power substrate 122 is waited through heat conduction with external air through the formed cooling fins. Can be released into the medium.

On the other hand, as shown in Figure 2, the housing 110 and the heat dissipation unit 130 may form a concave-convex coupling portion at the mutually coupled portion, for example, the housing 110 has a first coupling protrusion 111 May be formed, and a first coupling groove 131 may be formed at a corresponding position of the heat dissipation unit 130. Through such a complementary coupling, the housing 110 and the heat dissipation unit 130 may be complementarily coupled.

The printed circuit board 120 including the power board 122 and the main board 124 and the heat dissipation unit 130 have the same configuration as the conventional electric steering device controller, and a detailed description of the structure will be omitted.

The cover member 140 is coupled to the other side of the opening of the housing 110 to which the heat dissipation unit 130 is coupled, and seals the inner space of the housing 110. The cover member 140 may be formed of the same material as the housing 110 or may be formed of different materials. According to this embodiment, the cover member 140 may be formed of a resin material.

Meanwhile, as shown in FIG. 4, the housing 110 and the cover member 140 may form a concave-convex coupling portion at a portion that is coupled to each other. For example, the housing 110 has a second coupling protrusion 112 May be formed, and a second coupling groove 132 may be formed at a corresponding position of the cover member 140. Through such complementary coupling, the housing 110 and the cover member 140 may be complementarily coupled.

The shielding unit 150 is for shielding heat and electromagnetic waves of the FET 210 emitted through the housing 110 and the cover member 140. According to the present embodiment, the shielding unit 150 may include first and second shielding members 152 and 154.

The first shielding member 152 may be installed on the inner wall of the housing 110 and may be formed of a metal material. For example, according to the present embodiment, the first shielding member 152 may be made of an aluminum alloy material, such as AL 3003. The first shielding member 152 may be disposed in contact with the inner wall of the housing 110. However, it is not limited thereto, and may be spaced apart at predetermined intervals. Alternatively, when the housing 110 is ejected, a certain portion of the insert injection can be performed, and a metal member is not separately formed, and is coated with a paint including aluminum powder, or a foil type, double-sided tape, or adhesive is used. It can be installed in various ways, such as fixing.

According to this embodiment, the first shielding member 152 may be formed in the same square frame shape as the housing 110 so as to contact the inner wall of the housing 110 as shown in FIG. 2. . In addition, a lower portion of the first shield member 152 in contact with the heat dissipation unit 130 may further include an elastic plate 152a bent in a J-shape. The elastic plate (152a) is in surface contact with the heat dissipation unit 130, transfers heat generated from the FET 121, and allows the printed circuit board 120 to be grounded through the heat dissipation unit 130. can do. That is, when heat generated from the printed circuit board 120 is transferred to the first shielding member 152 provided on the sidewall of the housing 110, the first shielding member 152 transfers the heat to the heat dissipating unit 130 Thus, the heat dissipation unit 130 may perform a heat dissipation function, and the printed circuit board 120 may be grounded through a connection with the ground part of the printed circuit board 120.

In addition, the elastic plate 152a may also play a role of preventing cracks in the housing 110. That is, since the elastic plate 152a is formed of a metal material and the end is bent in a J-shape, it may be deformed when an external impact occurs due to its own elastic deformation. Since shock and vibration can be absorbed through such deformation, it is possible to prevent occurrence of cracks or the like by directly transmitting an external shock to the housing 110.

The second shielding member 154 is an inner surface of the cover member 140, as shown in FIG. 3, and is installed to wrap the side facing the printed circuit board 120 and the side of the cover member 140 Can be. According to this embodiment, the second shielding member 154 may be provided in a plate shape, and a portion coupled to the housing 110 may be bent to a predetermined length.

As shown in FIG. 3, the second shielding member 154 is installed on the inner surface of the cover member 140 and is installed to surround the inner top and side surfaces of the cover member 140. The second shielding member 154 wraps the inner surface of the cover member 140 formed of a resin material to prevent the cover member 140 from being deformed by heat radiated to the upper side of the printed circuit board 120. Electromagnetic waves emitted from the substrate 120 may be shielded.

In addition, the second shielding member 154 may be formed to cover only a part of the inner surface of the cover member 140. That is, as shown in FIG. 4, the second shielding member 154 is installed only at a position corresponding to a component that intensively emits heat and electromagnetic waves, such as the FET 121, and the cover member 140 is in other parts. It can also be configured to be exposed as it is. At this time, the second shielding member 154 may be fixedly coupled by a plurality of fastening members S, in which case, the fastening member S may be provided with a screw screw or the like.

Meanwhile, in an embodiment of the present invention, as shown in FIG. 2, the second shielding member 154 is in a state in which the first shielding member 152 and the second shielding member 154 are configured to have elasticity. ) May be disposed in contact with each other to be positioned inside the first shield member 152.

That is, as an upper surface of the first shielding member 152, a surface facing the cover member 140 forms an inclined surface 152b inclined toward the outside of the housing 110, and the second shielding member 154 While entering along the inclined surface 152b, the first and second shielding members 152 and 154 may be coupled to be energized while maintaining a contacted state. Through this configuration, the first and second shielding members 152 and 154 are combined in a state capable of exchanging both heat and electromagnetic waves, thereby shielding the first and second shielding of both heat and electromagnetic waves generated by the FET 121 The members 152 and 154 can be shielded together.

In addition, as shown in FIG. 5, the elastic plate 152a formed at the end of the first shielding member 152 may be screwed to the heat dissipating unit 130 by a fastening member (S). That is, although it is possible to fix it by elastic hooking without a separate fastening member, it may be combined with a fastening member S made of a metal material so that heat transfer and grounding with the heat dissipating unit 130 can be performed more effectively.

According to this embodiment, the connecting portion of the inclined surface of the first shielding member 152 and the second shielding member 154 can be deformed by elastic deformation when combined, and is integrally with the first shielding member 152. Since the formed elastic plate 152a can also be elastically deformed in the process of coupling with the heat dissipation unit 130, such deformation of the first and/or second shielding members 152 and 154 may cause vibration and By attenuating the impact, it is possible to prevent damage such as cracks that may occur when vibrations and shocks are transmitted to the housing 110. Therefore, since the heat dissipation area is increased compared to a structure in which the heat dissipation unit 130 alone performs heat dissipation work on the lower side of the existing structure, heat dissipation performance may be improved. In addition, since the housing 110 formed of a resin material vulnerable to heat and the blocking unit 150 are provided inside the cover member 140 side, the thermal deformation of the corresponding parts is prevented, and electromagnetic wave shielding is also possible. Reliability and performance can be improved.

In the above, embodiments of the present invention have been described, but those of ordinary skill in the relevant technical field can add, change, delete or add components within the scope not departing from the spirit of the present invention described in the claims. Accordingly, the present invention can be variously modified and changed, and it will be said that this is also included within the scope of the present invention.

110; Housing 120; Printed circuit board
121; FET 122; Power board
124; Motherboard 130; Heat dissipation unit
140; Cover member 150; Shielding unit
152; A first shielding member 154; 2nd shielding member

Claims (10)

A housing having both ends open and an inner space portion;
A printed circuit board installed in the space formed in the housing;
A heat dissipating unit installed to close one opening of the housing and dissipating heat generated from the printed circuit board to the outside of the housing;
A cover member coupled to the other opening of the housing in which the heat dissipation unit is installed; And
A shielding unit installed at least one of the inner circumferential surface of the housing and the surface facing the printed circuit board of the cover member to discharge heat from the printed circuit board to the outside of the housing and shield electromagnetic waves of the printed circuit board Including ;,
The shielding unit,
A first shielding member installed on the inner circumferential surface of the housing; And
Includes; a second shielding member installed on an inner surface of the cover member facing the printed circuit board,
The first shielding member,
Further comprising an inclined surface having a predetermined angle so as to face the outside of the housing on the surface facing the cover member,
The second shielding member is an electric steering device controller that comes into contact with an inner surface of the first shielding member along the inclined surface.
delete The method of claim 1,
The shielding unit is an electric steering device controller formed of a metal material.
The method of claim 1,
The shielding unit is an electric steering device controller formed of an aluminum alloy.
The method of claim 1,
The first shielding member and the second shielding member are in contact with each other so as to be energized at an assembly position of the housing and the cover member.
The method of claim 1,
The electric steering device controller further comprising an elastic plate integrally extending and bent at an end of the first shielding member facing the heat dissipating unit to make surface contact with the heat dissipating unit.
The method of claim 6,
The elastic plate is an electric steering device controller that serves as a grounding function of the printed circuit board through contact with the heat dissipation unit.
The method of claim 6,
The elastic plate is an electric steering device controller fixedly coupled to the heat dissipation unit and a fastening member.
delete The method of claim 1, wherein the second shielding member,
The electric steering device controller fixedly coupled by the cover member and the fastening member.

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