JP2017188511A - Power conversion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion device capable of suppressing thermal interference between heating components.SOLUTION: The power conversion device comprises: a first heating component 20 having a main body part 21 and terminal parts 22, 23; a second heating component 30 having a main body part 31 and terminal parts 32, 33; and a substrate 50 in which terminal parts 22, 23 of the first heating component 20 and terminal parts 32, 33 of the second heating component 30 are electrically connected. The main body part 21 of the first heating component 20 is covered with a first covering member 65, and the main body part 31 of the second heating component 30 is covered with a second covering member 66. The first covering member 65 and the second covering member 66 are brought into contact with a cooling material. A flow channel 90a to which the cooling material flows is formed in a space where one side face 65a as a part of the first covering member 65 and one side face 66a as a part of the second covering member 66 are faced to each other.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power conversion device.

  An example of a general structure of the in-vehicle power converter is shown in FIG. As shown in FIG. 3, the substrate 101 is fixed to the protrusions 100 a and 100 b of the housing 100 by screws 102 and 103. Are disposed via the heat dissipating members 108, 109, 110. The heat generating components 104, 105, and 106 are a coil, a transformer, a power MOSFET, a power diode, and the like. Note that the semiconductor device disclosed in Patent Document 1 includes a semiconductor element that generates heat during use and a cooler that contains a coolant for heat dissipation of the semiconductor element, and the semiconductor element is an inner surface on one surface of the cooler. A waterproof layer that prevents contact between the semiconductor element and the coolant is provided inside the cooler.

JP 2010-245329 A

However, heat interference occurs between the heat generating components. That is, thermal interference occurs between the heat generating component 104 and the heat generating component 105 in FIG. 3 and between the heat generating component 105 and the heat generating component 106.
The objective of this invention is providing the power converter device which can suppress the thermal interference between heat-emitting components.

  In the first aspect of the present invention, the first heat generating component having the main body portion and the terminal portion, the second heat generating component having the main body portion and the terminal portion, the terminal portion of the first heat generating component, and the And a substrate to which a terminal portion of the second heat generating component is electrically connected, wherein the main body portion of the first heat generating component is covered with a first covering member, The heat generating component body 2 is covered with a second covering member, the first covering member and the second covering member are in contact with a coolant, and a part of the first covering member and the The gist is that a channel through which a coolant flows is formed in a space where a part of the second covering member faces each other.

  According to the first aspect of the present invention, the first covering member and the second covering member are in contact with the coolant, and a part of the first covering member and a part of the second covering member are in contact with each other. Since the coolant flows in the spaces facing each other, it is difficult for heat interference between the first heat generating component and the second heat generating component, and heat interference between the heat generating components can be suppressed.

The invention according to claim 2 is summarized in that, in the power conversion device according to claim 1, at least one of the first covering member and the second covering member is made of metal.
According to the second aspect of the present invention, noise shielding is possible.

The gist of the invention according to claim 3 is that, in the power conversion device according to claim 1, the first covering member and the second covering member are integrated.
According to the invention described in claim 3, the number of parts can be reduced.

The invention according to claim 4 is the power conversion device according to any one of claims 1 to 3, wherein the first heat generating component and the second heat generating component are adjacent to each other. To do.
According to the invention described in claim 4, it is possible to further reduce the size.

  According to a fifth aspect of the present invention, in the power conversion device according to any one of the first to fourth aspects, the main body portion of the first heat generating component and the second heat generating component are provided on one surface of the substrate. The main body is disposed, and at least one of a capacitor element, a resistor component, and a control semiconductor element is disposed on one surface of the substrate.

  According to the fifth aspect of the present invention, at least one of the capacitor element, the resistor component, and the control semiconductor element may be disposed close to the main body portion of the first heat generating component and the main body portion of the second heat generating component. Heat can be hardly transmitted to at least one of the capacitor element, the resistance component, and the control semiconductor element that are vulnerable to heat.

  According to the present invention, thermal interference between heat-generating components can be suppressed.

The block diagram of the vehicle-mounted charger in embodiment. The cross-section figure of a vehicle-mounted charger. The cross-section figure for demonstrating background art.

Hereinafter, an embodiment in which the present invention is embodied by taking an in-vehicle charger as an example will be described with reference to the drawings.
As shown in FIG. 1, the on-vehicle charger 10 of the present embodiment includes an AC filter 11, a PFC circuit (power factor correction circuit) 12, a smoothing capacitor unit 13, a DC / DC converter 14, a rectifier circuit 15, and a smoothing coil unit 16. And a DC filter 17. And AC100-200V is input from the exterior of a vehicle, DC / DC conversion is performed in the DC / DC converter 14 through the AC filter 11, the PFC circuit 12, and the smoothing capacitor part 13, and the rectifier circuit 15, the smoothing coil part 16, and the DC filter 17 are obtained. The 300-500V battery is charged through the 300-500V battery.

  The AC filter 11 includes a coil, the PFC circuit 12 includes a power MOSFET, a power diode, and a coil, the smoothing capacitor unit 13 includes a capacitor, and the DC / DC converter 14 includes a power MOSFET, a transformer, and a coil. The rectifier circuit 15 includes a power diode, the smoothing coil unit 16 includes a coil, and the DC filter 17 includes a coil.

  Here, there are a transformer of the DC / DC converter 14, a coil of the PFC circuit 12, a capacitor of the smoothing capacitor unit 13, and the like as tall parts. Heavy components include a transformer of the DC / DC converter 14, a coil of the PFC circuit 12, and a coil of the smoothing coil unit 16. Furthermore, components that require cooling include a power MOSFET of the DC / DC converter 14, a power diode of the rectifier circuit 15, a coil of the PFC circuit 12, and a transformer of the DC / DC converter 14.

  In the cross-sectional structure of the in-vehicle charger 10 shown in FIG. 2, a first heat generating component 20 having a main body portion 21 and terminal portions 22 and 23, and a second heat generating component having a main body portion 31 and terminal portions 32 and 33. 30, and an electronic component 40 having a main body 41 and terminal portions 42 and 43. Each main-body part 21,31,41 has the shape of a cylinder or a polygonal column, and if it is a rectangular parallelepiped shape, it has six sides. Furthermore, the board | substrate 50 with which the terminal parts 22 and 23 of the 1st heat-emitting component 20, the terminal parts 32 and 33 of the 2nd heat-emitting component 30, and the terminal parts 42 and 43 of the electronic component 40 are electrically connected is provided. The heat generating components 20 and 30 are a coil, a transformer, and the like that generate a large amount of heat. In addition, the heat generating components 20 and 30 are power MOSFETs that constitute the DC / DC converter 14, and in FIG. ing. The electronic component 40 is a heat-sensitive semiconductor component or a resistance component whose performance is deteriorated by heat. Examples of the electronic component 40 include a capacitor element. Examples of the capacitor element include power smoothing, electrolytic capacitors for filters, and film capacitors. The electronic component 40 is, in a broad sense, a component that is vulnerable to heat or a component that deteriorates in performance due to heat (such as a control semiconductor element that controls a power MOSFET, a resistor component, or a capacitor).

As described above, the electronic component 40 is at least one of a capacitor element, a resistance component, and a control semiconductor element.
The metal plate 60 separating the heat generating component and the substrate extends in the horizontal direction, and the first heat generating component 20, the second heat generating component 30, and the electronic component 40 are spaced apart from each other on the upper surface of the metal plate 60. . One surface of each of the main body portions 21, 31, 41 is in contact with the upper surface of the metal plate 60 (surface contact). The first heat generating component 20 disposed on the metal plate 60 is surrounded by a metal lid member 61 having a U-shaped cross section. The metal lid member 61 and the metal plate 60 are integrated, and there is no gap between the metal lid member 61 and the metal plate 60.

  Thus, the opening part in the metal lid member 61 having a U-shaped cross section is closed by the metal plate 60, and the first covering member 65 is configured. The main body 21 of the first heat generating component 20 is covered with a first covering member 65.

  Similarly, the second heat generating component 30 disposed on the metal plate 60 is surrounded by a metal lid member 62 having a U-shaped cross section. The metal lid member 62 and the metal plate 60 are integrated, and there is no gap between the metal lid member 62 and the metal plate 60. As described above, the opening in the metal lid member 62 having a U-shaped cross section is closed by the metal plate 60, and the second covering member 66 is configured. The main body 31 of the second heat generating component 30 is covered with a second covering member 66.

  The electronic component 40 disposed on the metal plate 60 is surrounded by a metal lid member 63 having a U-shaped cross section. The metal lid member 63 and the metal plate 60 are integrated, and there is no gap between the metal lid member 63 and the metal plate 60. As described above, the opening portion of the metal lid member 63 having a U-shaped cross section is closed by the metal plate 60, and the third covering member 67 is configured. The main body 41 of the electronic component 40 is covered with a third covering member 67.

  Further, the heat generating components 20 and 30, the electronic component 40, and the metal lid members 61, 62, and 63 disposed on the metal plate 60 are surrounded by a metal lid member 68 having a U-shaped cross section. That is, the opening in the metal lid member 68 having a U-shaped cross section is closed by the metal plate 60, and the metal lid members 61, 62, 63 are covered with the metal lid member 68. There is no gap between the metal lid 68 and the metal plate 60.

  A space between the inside of the metal lid 68 and the outside of the metal lids 61, 62, 63 serves as a coolant passage 90. The coolant flows through the coolant passage 90. The coolant may be liquid (eg water) or gas (eg air). The first covering member 65, the second covering member 66, and the third covering member 67 are in contact with the coolant.

  Here, a flow path 90a through which a coolant flows is formed in a space where one side surface 65a as a part of the first covering member 65 and one side surface 66a as a part of the second covering member 66 face each other. ing. The other side surface 66 b that is a part of the second covering member 66 and the one side surface 67 a that is a part of the third covering member 67 are opposed to each other. The coolant flows in the space that faces it.

  The first covering member 65, the second covering member 66, and the third covering member 67 are made of metal. In a broad sense, at least one of the first covering member 65 and the second covering member 66 is made of metal. The first covering member 65, the second covering member 66, and the third covering member 67 are integrated, and are one part. The first heat generating component 20 and the second heat generating component 30 are adjacent to each other, and the second heat generating component 30 and the electronic component 40 are adjacent to each other.

  Further, the main body portion 21 of the first heat generating component 20, the main body portion 31 of the second heat generating component 30, and the electronic component 40 are arranged on the upper surface, which is one surface of the substrate 50. That is, an electronic component (at least one of a capacitor element, a resistance component, and a control semiconductor element) 40 is disposed on the upper surface, which is one surface of the substrate 50.

  The terminal portions 22 and 23 of the first heat generating component 20 extend downward, penetrate the metal plate 60, and are electrically connected to the substrate 50 by a connector 51, solder, screws, or the like. The terminal portions 32 and 33 of the second heat generating component 30 extend downward, penetrate the metal plate 60, and are electrically connected to the substrate 50 by a connector 52, solder, screws, or the like. The terminal portions 42 and 43 of the electronic component 40 extend downward, penetrate the metal plate 60, and are electrically connected to the substrate 50 by a connector 53, solder, screws, or the like.

  The substrate 50 disposed on the lower surface side of the metal plate 60 is surrounded by a metal lid member 70 having a U-shaped cross section. That is, an opening in the metal lid member 70 having a U-shaped cross section is closed by the metal plate 60, and the substrate 50 is covered with the metal lid member 70. There is no gap between the metal lid 70 and the metal plate 60.

Next, the operation will be described.
As the in-vehicle charger 10 is driven, the main body 31 of the first heat generating component 20 and the main body 31 of the second heat generating component 30 generate heat. This heat is exchanged with the coolant flowing in the coolant passage 90.

  As shown in FIG. 2, the heat generating components 20 and 30 are separated from the substrate 50 by dividing the apparatus into two vertically, and the separated heat generating components 20 and 30 side casing (metal plate 60, lid members 61 and 62, 68) can perform forced cooling by supplying air or water flow. If the heat radiation balance can be maintained, it is possible to remove the metal lid 68 and allow natural cooling.

As described above, since heat dissipation from the heat generating components 20 and 30 to the substrate 50 can be prevented, the capacity (occupied capacity) around the substrate 50 can be reduced, and the apparatus can be downsized.
Hereinafter, it will be compared with FIG.

  In the case of the configuration of FIG. 3, heat can be radiated from only one surface (upper surface) of the heat generating components 104, 105, 106, but in the present embodiment of FIG. From the surface). As a result, it is possible to suppress the temperature rise of the heat generating components 20 and 30 even without a heat sink, and it is possible to reduce the size and cost of the components by reducing the heat sink. Even when the loss of the heat-generating component is large and the heat generation is large, the heat sink can be downsized as compared with the configuration shown in FIG.

  Further, in the case of the configuration of FIG. 3, if the capacitor self-heating is reduced by increasing the capacitor capacity to ensure the durability, it is necessary to mount an extra capacitor and the parts cannot be placed close to each other. If it is impossible to reduce the size of the heat sink and heat is released by the heat sink, the heat sink is increased in size and cost.

  On the other hand, in the present embodiment, the heat generating components 20 and 30 and the substrate 50 are thermally separated to reduce the temperature of the substrate 50 and the inside air temperature. Further, the heat generating components 20 and 30 are efficiently cooled without using a dedicated heat sink. Further, as the heat distribution when the heat generating component is placed in the housing, the temperature of the housing increases as the temperature of the heat generating component increases. However, as the heat distribution when the heat generating components 20 and 30 are arranged outside the housing, In addition, the temperature of the heat generating components 20 and 30 can be lowered, and the temperature of the casing (metal plate 60 and lid member 70) surrounding the substrate 50 can be lowered. Thereby, the temperature rise of the housing | casing (metal plate 60, the cover material 70) surrounding the board | substrate 50 is suppressed.

Further, noise shielding can be performed by setting the metal covering members 65, 66, and 67 to the ground potential.
In the configuration of FIG. 3, thermal interference occurs between the heat generating components. More specifically, since each heat generating component 104, 105, 106 faces both the cooler 107 and the substrate 101, heat from the heat generating component 104, 105, 106 is easily transmitted to the substrate 101 side, and the device If the size is reduced, the heat generating components 104, 105, and 106 are brought close to each other, and there is a concern of causing an operation failure and a reduction in life. In order to prevent this, it is necessary to increase the distance L1 between the heat generating component 104 and the heat generating component 105 and the distance L2 between the heat generating component 105 and the heat generating component 106, which reduces the size of the apparatus. It will be obstructed.

  In the present embodiment, the heat generating component and the heat generating component can be arranged close to each other by suppressing the heat interference between the heat generating component, and as a result, the size can be reduced. That is, by forming a space around the heat generating component and flowing the coolant, the heat interference between the heat generating components can be suppressed and the heat generating components can be arranged close to each other, and as a result, the size can be reduced. In particular, it is possible to reduce the size by gathering tall components on one surface of the substrate while avoiding thermal interference.

  Further, since the tall heat-generating components 20 and 30 and the electronic component 40 are arranged on the coolant passage side, there is no tall heat-generating component on the substrate 50 side, so that the housing (metal lid member 70) with respect to the substrate 50 is provided. Can be reduced.

According to the above embodiment, the following effects can be obtained.
(1) As a configuration of the in-vehicle charger 10 as a power conversion device, a second heat generating component 20 having a main body portion 21 and terminal portions 22 and 23, and a second heat generating component 20 having a main body portion 31 and terminal portions 32 and 33 are provided. And the substrate 50 to which the terminal portions 22 and 23 of the first heat generating component 20 and the terminal portions 32 and 33 of the second heat generating component 30 are electrically connected. The main body portion 21 of the first heat generating component 20 is covered with a first covering member 65, and the main body portion 31 of the second heat generating component 30 is covered with a second covering member 66. The first covering member 65 and the second covering member 66 are in contact with the coolant. A channel 90a through which a coolant flows is formed in a space where one side surface 65a as a part of the first covering member 65 and one side surface 66a as a part of the second covering member 66 face each other.

  Therefore, the first covering member 65 and the second covering member 66 are in contact with the coolant, and in a space where a part of the first covering member 65 and a part of the second covering member 66 face each other. Since the coolant flows, it is difficult for the first heat-generating component 20 and the second heat-generating component 30 to interfere with heat, and the heat interference between the heat-generating components can be suppressed.

  Further, when the size is reduced, the coolant becomes difficult to flow, and when it is difficult to flow, heat interference is likely to occur. However, since the first covering member 65 and the second covering member 66 are in contact with the coolant, the heat interference is suppressed and the size is reduced. Can be achieved.

(2) At least one of the first covering member 65 and the second covering member 66 is made of metal. Therefore, noise shielding is possible.
(3) The first covering member 65 and the second covering member 66 are integrated. Therefore, the number of parts can be reduced.

(4) The first heat generating component 20 and the second heat generating component 30 are adjacent to each other. Therefore, the size can be further reduced.
(5) The main body portion 21 of the first heat generating component 20 and the main body portion 31 of the second heat generating component 30 are disposed on one surface of the substrate 50, and electronic components (capacitor elements and resistor components) are disposed on one surface of the substrate 50. And at least one of the control semiconductor elements) 40 is disposed (mounted). That is, the substrate 50 is mounted with a semiconductor component that is vulnerable to heat, a resistance component whose performance is degraded by heat, and the like. The electronic component (at least one of the capacitor element, the resistor component, and the control semiconductor element) 40 may be disposed close to the main body portion 21 of the first heat generating component 20 and the main body portion 31 of the second heat generating component 30. Heat can be hardly transmitted to an electronic component (at least one of a capacitor element, a resistance component, and a control semiconductor element) 40 that is vulnerable to heat.

  Further, if the electronic component 40 is disposed on the surface opposite to the surface on which the heat generating components 20 and 30 are disposed on the substrate 50, tall components are disposed on both surfaces of the substrate 50. Deteriorating. In the present embodiment, the electronic component 40 (component that is weak against heat, such as a capacitor element) can be disposed close to the heat generating components 20 and 30.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The covering members 65, 66, and 67 may be a resin containing a conductive filler or ferrite. That is, noise can be absorbed by using conductive resin or noise absorbing resin.

The covering members 65, 66, 67 may not have a shielding function as long as they do not interfere with heat, and in this case, they can be made of resin.
The coolant is allowed to flow also on the lower surfaces of the covering members 65, 66, and 67 (the lower surface of the metal plate 60), that is, the metal lid member (substrate casing) 70 and the metal lid member (cooling casing) 68. By providing a coolant passage between them, the six surfaces of the heat generating components 20 and 30 can be used as cooling surfaces.

-The metal plate 60 and the lid | cover materials 61, 62, 63, 68, 70 may be integrated, and may be divided | segmented for every component.
Between the main body 21 of the first heat generating component 20 and the first covering member 65, between the main body 31 of the second heat generating component 30 and the second covering member 66, and the main body of the electronic component 40 Between the portion 41 and the third covering member 67, a thermal compound may be filled.

  The main body 21 of the first heat generating component 20 and the first covering member 65 may be in close contact with each other. Similarly, the main body 31 of the second heat generating component 30 and the second covering member 66 may be brought into close contact with each other. The main body 41 of the electronic component 40 and the third covering member 67 may be in close contact with each other.

FIG. 2 shows the case where the two heat generating components 20 and 30 and the electronic component 40 are arranged, but the number of heat generating components may be “2” or “3” or more.
The power conversion device can be applied to, for example, an in-vehicle AC inverter, an in-vehicle DC / DC converter, and an in-vehicle traveling inverter instead of the in-vehicle charger.

  DESCRIPTION OF SYMBOLS 10 ... Car-mounted charger, 20 ... 1st heat-emitting component, 21 ... Main-body part, 22, 23 ... Terminal part, 30 ... 2nd heat-generating component, 31 ... Main-body part, 32, 33 ... Terminal part, 40 ... Electronic component 50 ... Substrate, 65 ... First covering member, 65a ... One side surface, 66 ... Second covering member, 66a ... One side surface.

Claims (5)

A first heat-generating component having a main body portion and a terminal portion;
A second heat generating component having a main body portion and a terminal portion;
A substrate to which a terminal portion of the first heat generating component and a terminal portion of the second heat generating component are electrically connected;
A power conversion device comprising:
The main body of the first heat generating component is covered with a first covering member,
The main body of the second heat generating component is covered with a second covering member,
The first covering member and the second covering member are in contact with a coolant;
A power conversion device, wherein a flow path through which a coolant flows is formed in a space where a part of the first covering member and a part of the second covering member face each other.   The power conversion device according to claim 1, wherein at least one of the first covering member and the second covering member is made of metal.   The power conversion device according to claim 1, wherein the first covering member and the second covering member are integrated.   The power converter according to any one of claims 1 to 3, wherein the first heat generating component and the second heat generating component are adjacent to each other. A main body portion of the first heat generating component and a main body portion of the second heat generating component are disposed on one surface of the substrate,
5. The power conversion device according to claim 1, wherein at least one of a capacitor element, a resistance component, and a control semiconductor element is disposed on one surface of the substrate.

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