JP2012119587A - On-vehicle controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle controller which supports a flexible mount substrate so as to suppress the deformation of the mount substrate.SOLUTION: In an on-vehicle controller, flexible mount substrates 31 and 32, on which heating circuit components are mounted, are disposed in a housing 6H having a sealed structure. The mount substrates are supported on a support substrate 35, which has higher rigidity than that of the mount substrates fixed to the housing 6H and suppresses deformation, so as to form a gas passage. Further, a cooling gas, which conducts heat exchange with front and rear surfaces of the mount substrates through a heat exchange part 7 and circulates in the housing, is supplied.

Description

  The present invention relates to a vehicle-mounted control device provided with a mounting board on which a flexible and heat generating circuit component is mounted.

  As this type of in-vehicle control device, a plurality of substrates including a power substrate on which a power transistor is mounted and a control substrate on which a heating element is mounted are provided in multiple layers, and the power substrate is disposed in close contact with the cooling plate. The aluminum block is installed in close contact with the cooling plate to support one end edge of each board at a predetermined interval, and the other end edge of each board is electrically connected to the power board and to the capacitor outside the board. Proposed a control device for a vehicle air conditioner that is configured to be supported by each other in a predetermined region by a bus bar, is downsized, has a high configuration and vibration resistance strength, and has a good cooling performance (For example, refer to Patent Document 1).

JP 2004-140114 A

However, in the conventional example described in Patent Document 1, since the power substrate on which the power transistor is mounted is placed in close contact with the cooling plate, it can be cooled and transmitted from the vehicle. Although bending to some extent by vibration and impact can be suppressed, the other boards are supported in multiple layers by the aluminum blocks and columns that are erected on the cooling plate. The board bends when vibrations or shocks are transmitted from it and the mounting parts are repeatedly stressed and damaged, or the soldering part for fixing the mounting parts to the board is damaged, resulting in poor contact There is an unresolved issue.
Therefore, the present invention has been made by paying attention to the unsolved problems of the above-described conventional example, and can suppress the bending of the flexible substrate when vibration or impact is transmitted, It aims at providing the vehicle-mounted control apparatus which can also improve a cooling effect.

  In order to achieve the above object, an in-vehicle control apparatus according to an embodiment of the present invention includes an in-vehicle control in which a flexible mounting board in which a circuit component that generates heat is mounted in a hermetically sealed casing is disposed. The apparatus is configured to support the mounting substrate so as to form a gas passage on a support substrate that is higher in rigidity than the mounting substrate fixed to the housing and capable of suppressing bending, and on the front and back of the mounting substrate. A cooling gas that is heat-exchanged by the heat-exchange unit and circulates in the housing is supplied.

  According to this configuration, the mounting substrate having flexibility is supported so as to form a gas passage in the support substrate having higher rigidity, and the cooling gas circulating in the housing is supplied to the front and back of the mounting substrate. When vibration and shock are transmitted to the vehicle-mounted control device, the bending of the mounting board can be suppressed, and repeated stress can be prevented from acting on the mounting component and its fixed part, thereby improving durability. In addition, the cooling performance for the mounting substrate can be improved.

Moreover, the vehicle-mounted control apparatus which concerns on the other form of this invention is characterized by the said support substrate being supported by the required number of columnar spacers which planted the said mounting substrate in the said support substrate.
According to this configuration, since the mounting substrate is supported on the support substrate via the columnar spacer, a gas passage with low fluid resistance can be formed between the mounting substrate and the mounting substrate. The effect can be improved.

In the vehicle-mounted control device according to another aspect of the present invention, when the support substrate is formed of a conductive member, an insulating member is disposed between the support substrate and the mounting substrate. It is said.
According to this configuration, by disposing an insulating member between the support substrate and the mounting substrate, when the air volume of the cooling gas is small, the distance between the support substrate and the mounting substrate can be set to an interval where an electrical insulation distance cannot be secured. The cooling gas can be effectively used in close proximity.

  According to the present invention, in a vehicle-mounted control device in which a heat generating circuit component is mounted and a flexible mounting substrate is arranged in a sealed housing, the mounting substrate is bent with respect to vibration and impact transmitted from the vehicle. It is possible to prevent the occurrence of contact failure by suppressing the damage of the circuit component mounted by suppressing the damage and the damage of the soldering portion for fixing the circuit component, and the cooling performance for the mounting substrate can be improved.

1 is a schematic configuration diagram showing an embodiment of an electrically driven vehicle to which the present invention can be applied. It is a typical longitudinal cross-sectional view of the state which removed the front plate part which shows a power converter device. It is sectional drawing on the AA line of FIG. It is a top view of a liquid cooling heat sink. It is a bottom view of a liquid cooling heat sink. It is a top view which shows the mounting state of a support substrate. It is a top view which shows the mounting state of a control board. It is an enlarged front view which shows a control board and a support substrate. It is explanatory drawing which shows the heat conduction state of the circuit components mounted in the control board. It is explanatory drawing which shows the cooling air blowing state of a control board and a support substrate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration when the present invention is applied to an electric vehicle as an electrically driven vehicle.
In the figure, reference numeral 1 denotes an electric vehicle. The electric vehicle 1 is provided with, for example, an electric motor 2 for driving the front end on the front side of the vehicle, and as an in-vehicle control device for driving the electric motor 2. A power conversion device 3 and a vehicle control device 4 that supplies a control signal to the power conversion device 3 are arranged, and further stores a large number of storage batteries that supply power to the power conversion device 3 and the vehicle control device 4. A storage battery storage 5 is provided.

  As shown in FIGS. 2 to 5, the power conversion device 3 includes a casing 6 having a rectangular parallelepiped liquid-tightness. The casing 6 includes a box-shaped lower divided casing 6L that is divided into two parts in the upper and lower directions, an open upper end, a rectangular tube-shaped upper divided casing 6H that is open at the upper and lower ends, a lower divided casing 6L, and an upper section. It is composed of, for example, a water-cooled liquid-cooled heat sink 7 formed in a flat plate shape having a predetermined thickness that closes both divided surfaces interposed between the divided housings 6H. Here, the upper divided housing 6 </ b> H is closed at the upper end by the lid 8.

As shown in FIGS. 4 and 5, the liquid cooling heat sink 7 is formed in a flat rectangular parallelepiped shape having a predetermined thickness, and has a gas passage 11 that is relatively narrow on the front end side and extends to the vicinity of both end portions in the left-right direction. A gas passage 12 is formed so as to penetrate vertically, and a gas passage 12 that is wider than the gas passage 11 and extends in the left-right direction to the vicinity of both end portions is vertically penetrated.
A cooling water supply port 13 and a cooling water discharge port 14 to which cooling water as a cooling medium is supplied are formed on the front end surface of the liquid cooling sheet sink 7 so as to be exposed to the outside. Although not shown, the electric vehicle 1 includes a heat exchanger such as a radiator provided on the front surface of the electric vehicle 1 for cooling the cooled cooling water discharged from the cooling water discharge port 14, and the heat exchanger. And a cooling system that stores the cooling water cooled in step 1 and a cooling system that pressurizes the cooling water stored in the reservoir tank with a pump and supplies the cooling water to the cooling water supply port 13.

  Further, between the gas passages 11 and 12 on the upper surface of the liquid-cooled heat sink 7, as shown in FIG. 4, an IGBT as a power module constituting a chopper circuit for stepping up and down the DC power of the DC power source constituted by the storage battery described above. The module 21 and three IGBT modules 22 as power modules that constitute an inverter that converts DC power output from the chopper circuit into, for example, three-phase AC power are in a direction orthogonal to the extending direction of the cooling water insertion groove 17. They are arranged in parallel at a predetermined interval. Here, the IGBT modules 21 and 22 incorporate an IGBT (Insulated Gate Bipolar Transistor) as a switching element connected in series, a protection circuit, and the like.

  Further, between the gas passages 11 and 12 on the lower surface of the liquid cooling heat sink 7, as shown in FIG. 5, a relatively large cube-shaped reactor 23 that constitutes the above-described chopper circuit is a half on the cooling water discharge port 14 side. The heat dissipating fins 24 are disposed on the cooling water supply port 13 side adjacent to the reactor 23, and further provided on the gas passage 12 side of the heat dissipating fins 24 as shown in FIGS. A blower fan 25 with a louver that blows the cooling air cooled by the radiating fins 24 toward the gas passage 12 is disposed.

Further, the capacitor 26 constituting the chopper circuit and the three smoothing capacitors 27 inserted between the chopper circuit and the inverter are connected to the gas passage 12 of the liquid-cooled heat sink 7 at the terminal side thereof as shown in FIG. It is fixed to the lower divided housing 6L in a state of being inserted with a predetermined interval without contacting the inside.
On the other hand, above the IGBT modules 21 and 22 fixed to the liquid cooling heat sink 7, as shown in FIGS. 2 and 3, a gate driving circuit for controlling the gates of the IGBTs built in the IGBT modules 21 and 22, etc. A control board 31 as a mounting board on which a control circuit is mounted and a power board 32 on which a power circuit, a relay, and the like are mounted are arranged in parallel.

  Each of the control board 31 and the power supply board 32 is supported by a support member 33 fixed to the inner peripheral surface of the upper divided housing 6H. As shown in FIG. 6, the support member 33 includes a plurality of L-shaped fixing brackets 34 fixed to the front, rear, left and right inner walls of the upper divided housing 6H, and a metal plate or a thick plate supported by the fixing brackets 34. A highly rigid support substrate 35 such as glass-filled epoxy resin, and a spacer 36 composed of a plurality of insulating members respectively planted at the front and rear end portions and the front-rear direction center portion of the upper surface of the support substrate 35. It is configured. Here, as shown in an enlarged view in FIG. 8, the spacer 36 is attached to a cylindrical portion 36 a having a female screw portion formed on the head and a support substrate 35 that protrudes downward from the lower end surface of the cylindrical portion 36 a. The support protrusion 36b is inserted into the hole 37. Here, the rigidity of the support substrate 35 is set to be twice or more the rigidity of the control substrate 31 and the power supply substrate 32.

  The control board 31 and the power supply board 32 are individually placed on the upper end of the spacer 36, and the mounting screw 39 is inserted into the screw insertion hole 38 formed in the control board 31 and the power supply board 32 so as to face the spacer 36. Then, the control board 31 and the power supply board 32 are screwed and fixed onto the spacer 36 as shown in FIGS. Therefore, the control board 31 and the power supply board 32 that are provided in a predetermined space between the support board 35 and the control board 31 and the power supply board 32 and are thin and easily bent are held without being bent by the support board 35 having high rigidity. can do.

  In addition, the distance between the support substrate 35, the control substrate 31, and the power supply substrate 32 is shorter than the electrical insulation distance in order to reduce the cooling air discharge amount of the blower fan 40 described later and to reduce the overall configuration. Therefore, in order to ensure electrical insulation between the support substrate 35, the control substrate 31, and the power supply substrate 32, an insulating sheet 41 as an insulating member is fixed to an intermediate portion of the spacer 36. Has been placed.

  In this way, by individually placing the control board 31 and the power supply board 32 on the support board 35 via the spacers 36, the circuit components 42 mounted on the control board 31 and the power supply board 32 as shown in FIG. The heat is transferred to the electrical connection portion 44 such as soldering on the lower surface side of the control board 31 and the power supply board 32 via the lead 43, and the temperature of the whole board rises. Since the space for forming the gas passage is formed below the control board 31 and the power supply board 32, the temperature rise on the back side of the board can be suppressed.

  Further, a blower fan 40 facing the control board 31, the power supply board 32, and the support board 35 is disposed at a position facing the gas passage 12 on the right inner wall of the upper divided housing 6H. In order to arrange the blower fan 40, the control board 31, the power supply board 32 and the support board 35 are formed with notches 31a, 32a and 35a in the right rear part as shown in FIGS. Yes.

Further, the blower fan 40 has an air suction opening opened below the right inner wall side of the upper divided housing 6H, sucks the cooling air supplied from the gas passage 12 by the blower fan 25, and is disposed on the front surface. As shown in FIG. 10, the cooling air is distributed and blown by the louver that does not pass through the front and back of the control board 31 and the power supply board 32 to reach the gas passage 11 side.
Further, as shown in FIGS. 2 and 3, the lower split housing 6L and the upper split housing 6H are connected to the liquid cooling heat sink 7 via seal members 45 and 46 such as packing, and the upper split housing. The lid body 8 is connected to the body 6H via a seal member 47 such as packing, so that the housing 6 has a sealed structure.

Next, the operation of the above embodiment will be described.
Now, the power conversion device 3 is mounted on the electric vehicle 1, and the cooling water supply port 13 and the cooling water discharge port 14 of the liquid cooling heat sink 7 are connected to the cooling system mounted on the electric vehicle 1, thereby cooling from the cooling system. Water is supplied to the cooling water supply port 13 and the cooled cooling water discharged from the cooling water discharge port 14 is returned to the cooling system. At this time, the cooling water supply port 13 and the cooling water discharge port 14 of the liquid cooling heat sink 7 are directly exposed to the outside, so that the connection with the cooling system can be easily performed, and the housing at the time of the connection The liquid tightness of 6 is not lost, and it is possible to reliably prevent the cooling water from leaking into the housing 6.

Then, when the ignition switch of the electric vehicle 1 is turned on, the power conversion device 3 is activated, and the accelerator pedal or the like is operated, whereby a control command is input from the vehicle control device 4, thereby Conversion is started, and three-phase power corresponding to the control command is supplied to the electric motor 2.
As described above, when the power conversion device 3 is activated, each circuit component generates heat. In particular, the IGBT modules 21 and 22 and the reactor 23 that generate a large amount of heat are directly contacted and fixed to the liquid-cooled heat sink 7. Therefore, it is cooled by the cooling water flowing through the liquid cooling heat sink 7.

In addition to this, on the lower surface of the liquid cooling heat sink 7, a radiating fin 24 is disposed on the cooling water supply port 13 side in the vicinity of the reactor 23, and a blower fan 25 is disposed on the gas passage 12 side of the radiating fin 24. Therefore, the low temperature of the liquid-cooled heat sink 7 is conducted to the heat radiating fins 24, and the air trapped in the housing 6 is cooled by the heat radiating fins 24.
Then, the cooled air is dispersed and blown to the capacitors 26 and 27 as cooling air by the louver of the blower fan 25, and the capacitors 26 and 27 are cooled. At this time, the capacitors 26 and 27 are inserted at a predetermined interval in the front-rear direction with respect to the gas passage 12 of the liquid-cooled heat sink 7 as shown in FIG. All sides can be cooled and passed, and the cooling effect of the capacitors 26 and 27 can be improved.

  A blower fan 40 is also disposed above the gas passage 12 on the upper surface side of the liquid-cooled heat sink 7 so as to face the gas passage 12, and the lower surface of the right side wall of the upper divided housing 6H is provided by the blower fan 40. Cooling air that has cooled the capacitors 26 and 27 is taken in from the side, and as shown in FIG. 10, the space between the control board 31 and the power supply board 32 and the support board 35, the lower part of the control board 31, and the power supply board Cooling air is dispersed and blown into the upper side of 32. The cooling air cools the heat generating components mounted on the control board 31 and the power supply board 32, and cools the IGBT modules 21 and 22, and the cooling air after cooling them passes through the gas passage 11 to the radiating fins 24. A cooling air circulation path is formed which is cooled back and cooled and blown again to the capacitors 26 and 27 by the blower fan 25.

  Thus, according to the above-described embodiment, the lower divided housing 6L and the upper divided housing 6H are connected via the liquid cooling heat sink 7, and the IGBT modules 21 and 22 and the reactor 23 serving as heat-generating components are connected by the liquid cooling heat sink 7. Can be cooled directly. At this time, the lower divided housing 6L and the upper divided housing 6H are divided by the liquid cooling heat sink 7. By forming the gas passages 11 and 12 spaced apart from the liquid cooling heat sink 7 by a predetermined distance, the lower divided housing 6L is formed. In addition, gas can flow in and out through the gas passages 11 and 12 between the upper divided housing 6H, and a temperature difference between the lower divided housing 6L and the upper divided housing 6H can be prevented.

  In addition, the cooling air can be formed by mounting the radiating fins 24 on the liquid cooling heat sink 7 and disposing the blower fan 25 on the radiating fins 24. A cooling air circulation path for forcibly circulating cooling air can be formed by the air blowing fan 25 and the upper air blowing fan 40, and the internal temperature of the housing 6 can be averaged evenly. For this reason, it is possible to improve the degree of freedom of the layout of the heat generating components, and it is not necessary to make a space for heat dissipation, and the whole can be downsized. At this time, since the radiation fins 24 are provided on the cooling water supply port 13 side, the air cooling effect can be further enhanced.

  At this time, the control board 31 and the power supply board 32 are supported in parallel to the support board 35 that supports them with an interval of the spacer 36, so that the cooling air discharged from the blower fan 40 is supplied to the control board 31. When the cooling air is blown between the power supply substrate 32 and the support substrate 35 supporting them, the cooling air passes through the gas passages between the control substrate 31 and the power supply substrate 32 and the support substrate 35 supporting them, and the cooling air is It will reach | attain to the edge part on the opposite side to the ventilation fan 40 reliably, without scattering in an up-down direction, and can improve a cooling effect.

  Further, since the control board 31 and the power supply board 32 having low rigidity are each supported by the support board 35 having high rigidity via the spacers 36, a lot of vibration and impact transmitted from the vehicle body as in the electric vehicle 1 are transmitted. In this case, it is possible to prevent the control board 31 and the power supply board 32 from being bent due to vibration or impact, and the mounted electrical components are damaged by repeated stress due to the control board 31 and the power supply board 32 being bent. It is possible to reliably prevent the electrical connection portion 44 such as soldering that electrically connects the control board 31 and the power supply board 32 and the electrical components to be mounted from being damaged and causing a contact failure. .

  Further, as described above, the amount of air discharged from the blower fan 40 is suppressed to be small, and the space between the control board 31 and the power supply board 32 and the support board 35 that supports them is electrically insulated according to the demand for downsizing. When the distance is set to be less than the distance, an insulating sheet 41 as an insulating member is provided between the control board 31 and the power supply board 32 and the support base 35 that supports the control board 31 and the power supply board 32, thereby supporting the control board 31 and the power supply board 32 and these. Insulation with the supporting substrate 35 to be performed can be ensured.

Moreover, by mounting the power conversion device 3 having the above-described effect, it is possible to provide a highly durable electric vehicle regardless of a temperature change due to a traveling environment.
In the above embodiment, the case where the blower fan 40 is disposed at the right rear end of the upper divided housing 6H has been described. However, the present invention is not limited to this, and the control board 31 and the power supply board 32 and these As long as the cooling air can be discharged between the support substrate 35 and the support substrate 35, it can be installed at an arbitrary position. At this time, a good cooling air circulation path may be formed above and below the liquid cooling heat sink 7 in relation to the blower fan 25.

Moreover, in the said embodiment, although the space | interval of the control board 31 and the power supply board 32 and the support board | substrate 35 which supports these was narrowed and the insulating sheet 41 was installed between them, the control board 31 and the power supply board were demonstrated. In the case where the distance between the base plate 32 and the support substrate 35 supporting them can be set to be equal to or greater than the electrical insulation distance, the insulating sheet 41 can be omitted.
Moreover, in the said embodiment, although the case where it had the control board 31 and the power supply board 32 was demonstrated, it is not limited to this, The board | substrate with which the control board and the power supply board were integrated, and another power board The present invention can also be applied to the case where a plurality of layers are formed.

Furthermore, although the case where the liquid cooling heat sink was applied as a heat exchanger was demonstrated in the said embodiment, the heat exchanger of another structure can also be applied.
In the above embodiment, the case where the present invention is applied to a power conversion device as an in-vehicle control device has been described. However, the present invention is not limited to this, and a control device for a vehicle air conditioner or an electric power steering device can be used. The present invention can be applied to any other vehicle-mounted control device such as a control device.

  Furthermore, in the said embodiment, although the case where the power converter device by this invention was applied to the electric vehicle was demonstrated, it is not limited to this, It can apply this invention also to the rail vehicle which drive | works a rail. It can be applied to any electric drive vehicle, and the power conversion device is not limited to an electric drive vehicle, and the power conversion device of the present invention is applied when driving an actuator such as an electric motor in other industrial equipment. can do.

  DESCRIPTION OF SYMBOLS 1 ... Electric vehicle, 2 ... Electric motor, 3 ... Power converter device, 4 ... Vehicle control apparatus, 5 ... Storage battery storage part, 6 ... Case, 6L ... Lower division case, 6H ... Upper division case, 7 ... Liquid Cold heat sink, 8 ... Lid, 11, 12 ... Gas passage, 13 ... Cooling water supply port, 14 ... Cooling water discharge port, 21, 22 ... IGBT module, 24 ... Reactor, 25 ... Blower fan, 26, 27 ... Condenser , 31 ... Control board, 32 ... Power supply board, 33 ... Support member, 34 ... Fixing bracket, 35 ... Support board, 36 ... Spacer, 39 ... Mounting screw, 40 ... Blower fan, 41 ... Insulating sheet, 42 ... Circuit components

Claims (3)

A vehicle-mounted control device in which a flexible mounting board in which a circuit component that generates heat is mounted in a sealed housing is provided,
The mounting substrate is supported so as to form a gas passage on a supporting substrate that is higher in rigidity than the mounting substrate fixed to the housing and capable of suppressing bending, and heat is exchanged on the front and back of the mounting substrate by a heat exchange unit. An in-vehicle control device characterized in that a cooling gas which is exchanged and circulates in the housing is supplied.   The in-vehicle control device according to claim 1, wherein the support substrate is supported by a required number of columnar spacers in which the mounting substrate is planted on the support substrate.   The in-vehicle control device according to claim 1, wherein an insulating member is disposed between the support substrate and the mounting substrate when the support substrate is formed of a conductive member.

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