JP2016171672A - Control board for power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control board for a power converter where a discharge circuit and a wiring pattern, through which a polyphase current for driving an auxiliary motor flows, are provided efficiently on a common board body.SOLUTION: A control board for a power converter in a vehicle system includes a board body of multilayer board, a discharge circuit mounted on the surface of the board body and operating, when collision of vehicle is detected, to discharge the charges stored in a smoothing capacitor, a circuit part mounted on the board body and forming a second inverter, and a wiring pattern formed on the inner layer of the board body, connected with the circuit part of the second inverter, and through which a polyphase current for driving the auxiliary motor flows. When viewing in a direction perpendicular to the surface of the board body, at least a partial mounting position of the discharge circuit is within a range circumscribing the wiring pattern.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a control board for a power conversion device.

  A configuration is known that includes a rapid discharge circuit and incorporates an inverter device for a traveling motor, an inverter device for an auxiliary motor, and a smoothing capacitor (smoothing capacitor) in one housing (for example, Patent Document 1). reference).

JP 2011-234507 A

  However, in the configuration described in Patent Document 1, a driver circuit board related to an inverter device for an auxiliary motor has a circuit portion in which a three-phase current for driving the auxiliary motor flows, or rapid discharge. Since the circuit is not mounted, there is room for improvement from the viewpoint of mounting efficiency.

  Therefore, an object of the present disclosure is to provide a control board for a power conversion device in which a discharge circuit and a wiring pattern through which a multiphase current for driving an accessory motor flows are efficiently provided on a common board body.

According to one aspect of the present disclosure, the traveling motor (40) is connected to the power source (2) via the first inverter (11), and the auxiliary motor (50) is connected to the power source (2) via the second inverter (12). A power converter (10) in a vehicle system (1) connected to a power source (2), wherein the first inverter (11) and the second inverter (12) are connected in parallel to a common smoothing capacitor (14). ) Control board (400, 400A),
A substrate body (410) which is a multilayer substrate;
A discharge circuit (62) which is mounted on the surface of the substrate body (410) and which operates when a vehicle collision is detected and discharges electric charge accumulated in the smoothing capacitor (14);
A circuit part (422) mounted on the substrate body (410) and forming the second inverter (12);
A wiring pattern (480, 482, formed on the inner layer of the substrate body (410), connected to the circuit unit (422) of the second inverter (12) and through which a multiphase current for driving the auxiliary motor is passed. 484),
At least a part of the discharge circuit (62) is located within a range circumscribing the wiring pattern (480, 482, 484) when viewed in a direction perpendicular to the surface of the substrate body (410). A control board (400, 400A) for the device (10) is provided.

  According to the present disclosure, it is possible to obtain a control board for a power conversion device in which a discharge circuit and a wiring pattern in which a multiphase current for driving an accessory motor flows are efficiently provided on a common board body.

It is a figure which shows an example of the vehicle system which concerns on the control board for power converters. 3 is a circuit diagram showing an example of a discharge circuit 62. FIG. It is a top view which shows roughly an example of the control board for power converters by a top view. FIG. 4 is a cross-sectional view taken along line XX in FIG. 3. It is a figure which shows roughly the other example of the positional relationship of the mounting range D1 of the discharge circuit 62, and the wiring patterns 480, 482, and 484.

  Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a diagram illustrating an example of a vehicle system related to a control board for a power converter.

  The vehicle system 1 includes a battery 2 (an example of a power source), a power conversion device 10, a main motor 40, an auxiliary motor 50, and a control device 60. The vehicle system 1 is used in, for example, a hybrid vehicle or an electric vehicle.

  The battery 2 includes any type of power storage device such as a capacitive load such as a lead battery, a lithium ion battery, or an electric double layer capacitor. In the case of a dual power supply system having a high voltage battery and a low voltage battery, the battery 2 can be either a high voltage battery or a low voltage battery.

  The power conversion device 10 includes a first inverter 11, a second inverter 12, and a smoothing capacitor 14. Each of the first inverter 11 and the second inverter 12 includes a switching element such as an insulated gate bipolar transistor (IGBT) or a metal oxide semiconductor field-effect transistor (MOSFET).

  The first inverter 11 converts the DC voltage of the battery 2 into a three-phase current and supplies it to the main motor 40. The second inverter 12 converts the DC voltage of the battery 2 into a three-phase current and supplies it to the auxiliary motor 50. A booster circuit may be provided between the power converter 10 and the battery 2. The smoothing capacitor 14 is electrically connected between the positive electrode and the negative electrode of the battery 2 between the battery 2 and the first inverter 11 and the second inverter 12. The first inverter 11 and the second inverter 12 are electrically connected in parallel to the battery 2 and the smoothing capacitor 14.

  Main motor 40 includes a travel motor that generates driving force for the vehicle. The main motor 40 may be a motor generator that can also function as a generator.

  The auxiliary motor 50 is an electric motor incorporated in, for example, an electric oil pump. In addition, the auxiliary motor 50 may be any on-vehicle electric motor such as a power steering motor (assist motor), a wiper motor, or the like. A plurality of auxiliary machine motors 50 may be provided. In this case, the second inverter 12 is provided for each auxiliary motor 50. Hereinafter, it is assumed that the auxiliary motor 50 is an electric motor incorporated in an electric oil pump as an example.

  The control device 60 is realized by a computer. The control device 60 is realized by an ECU (Electronic Control Unit), for example.

  Control device 60 includes a discharge circuit 62, a first drive circuit 64, and a second drive circuit 66. The first drive circuit 64 drives and controls the switching element of the first inverter 11. The second drive circuit 66 drives and controls the switching element of the second inverter 12. Each of the first drive circuit 64 and the second drive circuit 66 is formed by, for example, a microcontroller.

  FIG. 2 is a circuit diagram illustrating an example of the discharge circuit 62. In FIG. 2, P represents the positive electrode of the battery 2, and N represents the negative electrode (= ground) of the battery 2.

  Discharge circuit 62 includes an abnormality detection unit 620, a power supply generation unit 621, and a discharge unit 622. Discharge unit 622 includes a discharge resistor R1. The discharge resistor R <b> 1 is electrically connected between the positive electrode and the negative electrode of the battery 2. Accordingly, the discharge resistor R <b> 1 is electrically connected between the positive electrode and the negative electrode of the battery 2 in a parallel relationship with the smoothing capacitor 14.

  The abnormality detection unit 620 receives a collision detection signal (discharge command). The collision detection signal is generated at or just before the occurrence of a vehicle collision. The collision detection signal is input from, for example, another ECU that detects a collision. For example, the collision detection signal is supplied from an airbag ECU, a pre-crash ECU or the like that controls a vehicle safety device (for example, an airbag).

  When a collision detection signal is input to the abnormality detection unit 620, the collision detection signal is input to the power generation unit 621 through the photocoupler PC. When the collision detection signal is input to the power generation unit 621, a constant voltage is applied to the gate of the switching element MOS1 by the Zener diode DZ, and the switching element MOS1 operates as a linear regulator. As a result, the switching element MOS2 of the discharge unit 622 is turned on, and the charge accumulated in the smoothing capacitor 14 flows to the ground via the discharge resistor R1 (that is, the discharge of the smoothing capacitor 14 is realized).

  FIG. 3 is a plan view schematically showing an example of the control board for the power conversion device in a top view. FIG. 4 is a cross-sectional view taken along line XX in FIG. The top view refers to a mode in which the control substrate 400 is viewed in a direction perpendicular to the surface of the substrate body 410 (a direction perpendicular to the surface). In FIG. 3, the mounting range of the discharge circuit 62 is schematically shown by a dotted line. In FIG. 3, the mounting ranges of the circuit units 422, 423, and 424 are schematically shown by solid lines. In addition, in FIG. 4, the number attached | subjected to the left of the cross section is the number of a layer.

  The control board 400 includes a board body 410, a discharge circuit 62, a circuit unit 422, solid patterns 426 and 427, and wiring patterns 480, 482, and 484. In the example shown in FIG. 3, the circuit unit 423 that forms the second drive circuit 66 and the circuit unit 424 that forms the first drive circuit 64 are mounted on the upper surface (front side) of the substrate body 410. Yes.

  The substrate body 410 is a multilayer substrate. The substrate body 410 preferably has one or more inner layers. In the example shown in FIG. 3, the substrate body 410 is a six-layer substrate, and the inner layers of 2 to 5 layers are electrically insulated from each other by an insulating layer.

  As shown in FIG. 3, the discharge circuit 62 is mounted on the surface of the substrate body 410. In the example shown in FIGS. 3 and 4, the discharge circuit 62 is mounted on the upper surface (front side) of the substrate body 410 and the lower surface (back side) of the substrate body 410, as shown in FIG. . The discharge circuit 62 may be mounted only on one of the upper surface (front side) of the substrate body 410 and the lower surface (back side) of the substrate body 410. A part of the discharge circuit 62 may be formed in the inner layer of the substrate body 410.

  The circuit unit 422 forms the second inverter 12. The circuit unit 422 is mounted on the surface of the substrate body 410 as shown in FIG. In the example illustrated in FIG. 3, the circuit unit 422 is mounted on the upper surface (front side) of the substrate body 410. A part of the circuit unit 422 may be formed in the inner layer of the substrate body 410.

  The solid patterns 426 and 427 are formed in the inner layer of the substrate body 410. Each of the solid patterns 426 and 427 is formed of a heat conductive material. Each of the solid patterns 426 and 427 is formed as, for example, a copper solid pattern. The solid patterns 426 and 427 are formed over the entire corresponding inner layer. The solid patterns 426 and 427 are electrically connected to the ground potential of the control board 400, for example. The solid patterns 426 and 427 may be electrically connected to each other through vias (not shown). The solid patterns 426 and 427 may be formed in arbitrary inner layers, respectively, but are preferably formed on the surface side of the wiring patterns 480, 482, and 484 as shown in FIG. In the example shown in FIG. 4, the solid pattern 426 is formed in the inner layer (second layer) close to the upper surface of the wiring patterns 480, 482 and 484, and the solid pattern 427 is more than the wiring patterns 480, 482 and 484. It is formed in the inner layer (fifth layer) close to the lower surface. As a result, the wiring patterns 480, 482 and 484 are sandwiched between the solid patterns 426 and 427 in the vertical direction.

  The wiring patterns 480, 482 and 484 are formed in the inner layer of the substrate body 410 as shown in FIG. The wiring patterns 480, 482, and 484 form a three-phase electric wire portion 30 (see FIG. 1) that connects the second inverter 12 and the auxiliary motor 50. As shown in FIG. 3, one end of each of the wiring patterns 480, 482, and 484 is electrically connected to the circuit unit 422 of the second inverter 12. The other ends of the wiring patterns 480, 482 and 484 are electrically connected to the auxiliary motor 50. In the wiring patterns 480, 482, and 484, a multiphase current for driving the auxiliary motor 50 (a three-phase current in the example shown in FIG. 3) flows. A three-phase current flows through the wiring patterns 480, 482, and 484 when the auxiliary motor 50 is operated.

  In the example shown in FIG. 3, one end of each of the wiring patterns 480, 482, and 484 is electrically connected to the circuit unit 422 of the second inverter 12, and the other end is electrically connected to the connector 450. Thereby, the circuit unit 422 of the second inverter 12 can be electrically connected to the auxiliary motor 50 separated from the board body 410 via the wiring patterns 480, 482 and 484 and the connector 450. For example, the circuit unit 422 of the second inverter 12 and the auxiliary motor 50 are electrically connected by electrically connecting a connector (not shown) at the end of a three-phase wire from the auxiliary motor 50 to the connector 450. Connected to. Instead of the connector 450, a through-type bus bar that penetrates the board body 410 to realize electrical connection may be used.

  The wiring patterns 480, 482 and 484 may be formed in different inner layers, or a part thereof may be formed in the same inner layer. In the example illustrated in FIG. 3, the wiring patterns 480 and 484 are formed in the same inner layer (third layer), and the wiring pattern 482 is formed in an inner layer (fourth layer) different from the wiring patterns 480 and 484. .

  In the present embodiment, at least a part of the discharge circuit 62 is provided in a range circumscribing the wiring patterns 480, 482, and 484 in a top view. At least a part of the discharge circuit 62 means at least a part of the components of the discharge circuit 62 as shown in FIG. At least a part of the discharge circuit 62 preferably includes an element (an element such as a discharge resistor R1 instead of a wiring pattern) among the components of the discharge circuit 62. In the example shown in FIG. 4, the switching element (switching element MOS1) and the discharge resistor R1 of the discharge circuit 62 are arranged on the cross section along the line XX in FIG. 3 as shown in FIG.

  The range circumscribing the wiring patterns 480, 482, and 484 includes the existence range (formation range) of the wiring patterns 480, 482, and 484 in a top view, and may be defined by, for example, a rectangular range or a polygonal range. Of course, the area circumscribing the wiring patterns 480, 482, and 484 may partially include a region where none of the wiring patterns 480, 482, and 484 exist.

  In the example shown in FIG. 3, a range circumscribing the wiring patterns 480, 482, and 484 in a top view is schematically indicated by a range D2. The range D2 is a rectangular range. In the example shown in FIG. 3, the entire mounting range D1 of the discharge circuit 62 overlaps the range D2 when viewed from above. The mounting range D1 of the discharge circuit 62 may be a range that circumscribes all the components of the discharge circuit 62, or a range that circumscribes some of the components of the discharge circuit 62. It may be. Further, the mounting range D1 of the discharge circuit 62 may correspond to the existence region of all the components of the discharge circuit 62, or may correspond to the existence region of some of the components of the discharge circuit 62. You can do it. In this case, a plurality of ranges D2 may exist separately.

  According to the present embodiment, as described above, the discharge circuit 62 and the wiring patterns 480, 482, and 484 through which the three-phase current for driving the auxiliary motor 50 flows are provided on the common substrate body 410. Thereby, an efficient configuration can be realized as compared with a configuration in which the discharge circuit 62 and the wiring patterns 480, 482, and 484 are formed on separate substrates.

  Further, according to the present embodiment, as described above, the wiring patterns 480, 482, and 484 are formed in the inner layer, and at least a part of the discharge circuit 62 is in a range circumscribing the wiring patterns 480, 482, and 484 in a top view. Located in. Thereby, an efficient configuration can be realized as compared with a configuration in which the discharge circuit 62 and the wiring patterns 480, 482, and 484 are provided in different regions (regions that do not overlap) in the top view of the substrate body 410. Here, as described above, the discharge circuit 62 basically works when a collision detection signal is generated, and does not work when the auxiliary motor 50 operates. When a collision detection signal is generated, a main switch (not shown) that electrically connects the battery 2 and the second inverter 12 is turned off or the second inverter 12 is deactivated, and the auxiliary motor 50 Is stopped. Basically, when the current flows through the discharge circuit 62 and the discharge circuit 62 generates heat, and when the current flows through the wiring patterns 480, 482 and 484, the wiring patterns 480, 482 and 484 generate heat at the same time. Means no. Therefore, as described above, even when at least a part of the discharge circuit 62 is located within a range circumscribing the wiring patterns 480, 482, and 484 in a top view, the inconvenience due to the close positional relationship (for example, Substantially higher temperature than allowable due to the simultaneous generation of both heats does not occur. As described above, according to the present embodiment, the discharge circuit 62 and the wiring patterns 480, 482, and 484 are brought close to each other by utilizing the difference in operation timing between the discharge circuit 62 and the wiring patterns 480, 482, and 484. By arranging them in a positional relationship, an efficient configuration can be realized while reducing the possibility of inconvenience during heat generation.

  Further, according to the present embodiment, the solid patterns 426 and 427 are formed on the surface side of the wiring patterns 480, 482, and 484, so that the wiring patterns 480, 482, and Heat dissipation when 484 generates heat can be promoted.

  FIG. 5 is a plan view schematically showing an example of a control board for a power conversion device in a top view. The control board 400A shown in FIG. 5 differs from the control board 400 shown in FIG. 3 only in the positional relationship between the mounting range D1 of the discharge circuit 62 and the wiring patterns 480, 482, and 484 in a top view. That is, FIG. 5 shows another variation on the example shown in FIG.

  In the example shown in FIG. 5, the mounting range D1 of the discharge circuit 62 overlaps the range D2 (range circumscribing the wiring patterns 480, 482, and 484) in a top view with a portion smaller than half. From the viewpoint of mounting efficiency, the mounting range D1 of the discharge circuit 62 preferably overlaps the range D2 as a whole when viewed from the top, but as shown in FIG. The mounting efficiency is improved as compared with a configuration in which these do not overlap at all.

  Although each embodiment has been described in detail above, it is not limited to a specific embodiment, and various modifications and changes can be made within the scope described in the claims. It is also possible to combine all or a plurality of the components of the above-described embodiments.

  For example, in the example shown in FIG. 3 (the same applies to the example shown in FIG. 5), the circuit portion 423 and the circuit portion 424 are provided in the substrate body 410, but one or both of the circuit portion 423 and the circuit portion 424 are different substrates. May be provided.

  In the example illustrated in FIG. 3, the solid patterns 426 and 427 are provided, but one or both of the solid patterns 426 and 427 may be omitted.

  In the above-described embodiment, the discharge circuit 62 operates when a collision detection signal is generated, but may operate when another event occurs. For example, the discharge circuit 62 may operate when an abnormality occurs or when the ignition switch is turned off.

In addition, the following is further disclosed regarding the above Example. The effects described below may not always be achieved. Further, the effect related to the feature of the subordinate form is an effect related to the feature, and is an additional effect.
(1)
The traveling motor (40) is connected to the power source (2) via the first inverter (11), and the auxiliary motor (50) is connected to the power source (2) via the second inverter (12). The control board (400, 400A) for the power converter (10) in the vehicle system (1) in which the inverter (11) and the second inverter (12) are connected in parallel to the common smoothing capacitor (14). And
A substrate body (410) which is a multilayer substrate;
A discharge circuit (62) which is mounted on the surface of the substrate body (410) and which operates when a vehicle collision is detected and discharges the electric charge accumulated in the smoothing capacitor (14);
A circuit part (422) mounted on the substrate body (410) and forming the second inverter (12);
A wiring pattern (480, 482, 484) formed in the inner layer of the substrate body (410), connected to the circuit section (422) of the second inverter (12), and through which a multiphase current for driving the auxiliary motor flows. Including
At least a part of the discharge circuit (62) is located in a range circumscribing the wiring patterns (480, 482, 484) when viewed in a direction perpendicular to the surface of the substrate body (410), and is a power converter (10 ) Control board (400, 400A).

According to the configuration described in (1), since the discharge circuit (62) and the wiring patterns (480, 482, 484) are formed on the same substrate body (410), they are provided on different substrates. Compared to the above, an efficient configuration can be realized. Further, since at least a part of the discharge circuit (62) is provided within a range circumscribing the wiring patterns (480, 482, 484) when viewed in the direction perpendicular to the surface of the substrate body (410), further An efficient configuration can be realized. Here, there is a high possibility that the time when the current flows through the discharge circuit (62) and the time when the current (polyphase current) flows through the wiring patterns (480, 482, 484) are not simultaneous. This is because the discharge circuit (62) operates when a vehicle collision is detected, whereas the auxiliary motor (50) does not operate (stops) when a vehicle collision is detected. Therefore, even when at least a part of the discharge circuit (62) is provided within a range circumscribing the wiring patterns (480, 482, 484) when viewed in the direction perpendicular to the surface of the substrate body (410), The possibility of inconvenience (for example, high temperature during heat generation) due to the close positional relationship can be reduced. In this way, an efficient configuration can be realized while reducing the possibility of inconvenience when the wiring patterns (480, 482, 484) generate heat and when the discharge circuit (62) generates heat.
(2)
The elements (MOS1, R1) forming the discharge circuit (62) are located within a range circumscribing the wiring patterns (480, 482, 484) when viewed in a direction perpendicular to the surface of the substrate body (410). A control board (400, 400A) for the power conversion device (10) according to (1).

According to the configuration described in (2), the element occupying a relatively large portion of the occupation range of the discharge circuit (62) is viewed in the direction perpendicular to the surface of the substrate body (410), and the wiring pattern (480, 482, 484) is provided in a range circumscribing 482, 484), so that a more efficient configuration can be realized.
(3)
Of the inner layer of the substrate body (410), the layer is formed closer to the surface of the substrate body (410) than the layer on which the wiring patterns (480, 482, 484) are formed. A control board (400, 400A) for the power conversion device (10) according to (1) or (2).

According to the structure as described in (3), heat dissipation can be improved using the heat capacity of a solid pattern (426, 427). Thereby, even when at least a part of the discharge circuit (62) is provided in a range circumscribing the wiring patterns (480, 482, 484) when viewed in the direction perpendicular to the surface of the substrate body (410), The possibility of inconvenience (for example, high temperature during heat generation) due to such close positional relationship can be further reduced.
(4)
A drive circuit (66) mounted on the substrate body (410) and drivingly controlling the second inverter (12);
The power conversion device (10) according to any one of (1) to (3), further including a drive circuit (64) mounted on the substrate body (410) and drivingly controlling the first inverter (11). ) Control board (400, 400A).

  According to the configuration described in (4), the drive circuit (66) for driving and controlling the second inverter (12) and the drive circuit (64) for driving and controlling the first inverter (11) have the same substrate body (410). ), It is possible to realize an efficient configuration as compared with the case where these are mounted on another board.

DESCRIPTION OF SYMBOLS 1 Vehicle system 2 Battery 10 Power converter 11 1st inverter 12 2nd inverter 14 Smoothing capacitor 40 Main motor 50 Auxiliary motor 60 Controller 62 Discharge circuit 64 1st drive circuit 66 2nd drive circuit 400, 400A Control board 410 Board Main unit 422 Circuit unit 426, 427 Solid pattern 480, 482, 484 Wiring pattern

Claims (4)

A traveling motor is connected to the power source via a first inverter, and an auxiliary motor is connected to the power source via a second inverter, and the first inverter and the second inverter are connected in parallel to a common smoothing capacitor. A control board for a power conversion device in a connected vehicle system,
A substrate body that is a multilayer substrate; and
A discharge circuit that is mounted on the surface of the substrate body and that operates when a vehicle collision is detected and discharges electric charges accumulated in the smoothing capacitor;
A circuit unit mounted on the substrate body and forming the second inverter;
A wiring pattern formed on an inner layer of the substrate body, connected to a circuit unit of the second inverter, and a multi-phase current for driving the auxiliary motor is passed through,
At least a part of the discharge circuit is a control board for a power converter, which is located in a range circumscribing the wiring pattern when viewed in a direction perpendicular to the surface of the board body.   2. The control board for a power converter according to claim 1, wherein the elements forming the discharge circuit are located within a range circumscribing the wiring pattern when viewed in a direction perpendicular to a surface of the board body.   3. The power conversion device according to claim 1, further comprising a solid pattern formed in a layer closer to a surface of the substrate body than a layer on which the wiring pattern is formed, of an inner layer of the substrate body. Control board. A drive circuit mounted on the substrate body for driving and controlling the second inverter;
The control board for a power converter according to any one of claims 1 to 3, further comprising a drive circuit mounted on the board body and configured to drive and control the first inverter.

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