JP6471656B2 - Inverter control board - Google Patents

Description

  The present invention relates to an inverter control board that is provided between an AC electrical device and a high-voltage DC power source and controls an inverter that converts power between DC and AC.

  Japanese Patent Application Laid-Open No. 2011-19395 (Patent Document 1) discloses an AC rotating electric machine (192, 194) for driving a vehicle and an AC rotating electric machine (195) for driving an auxiliary machine such as an electric pump or a compressor of an air conditioner. ) Is disclosed (in the background art, the reference numerals in parentheses are those of Patent Document 1). As is well known, an inverter that converts electric power between direct current and alternating current is provided between the direct current power source and the alternating current rotating electrical machine. The power conversion device of Patent Document 1 also includes two inverters (140, 142) corresponding to the two rotating electric machines (192, 194) for driving the vehicle, and an inverter (43) corresponding to the rotating electric machine for the auxiliary machine. have. In general, an inverter is configured using semiconductor switching elements, and a control signal for controlling the semiconductor switching elements is generated by a control device. Such a control device is generally not a large electric power (a large voltage of about several tens to several hundred volts, a large current of several amperes to several tens of amperes) necessary for driving a rotating electrical machine. It is driven by low power (a small voltage of about several volts, a small current of about several millimeters to several tens of milliamperes). For this reason, a drive circuit for applying a driving force to the control signal is provided between the control device and the inverter. In Patent Document 1, one control device (172) that generates a control signal is provided in common, and the drive circuits (174A to 174C) are inverter circuits (144, 144, 43) of the respective inverters (140, 142, 43). 145, 146) (Patent Document 1: FIGS. 1, 2, 4, [0011], [0017], [0021] to [0022], etc.).

  Since the power supply voltage of the power source is large as described above, the control device, the drive circuit, and the inverter are provided in an insulating region and are arranged in different regions. In Patent Document 1, the control circuit board (20) and the drive circuit board (22) are formed separately and connected via a connector. By the way, in order to transmit a control signal or the like through such an insulating region, an insulating signal transmission component such as a photocoupler or a transformer is also required. For this reason, it is difficult to reduce the size and cost of the power converter due to the increase in the area of the circuit board due to the provision of the insulation region and the increase in the number of insulation signal transmission parts used, and the cost of parts of the insulation signal transmission parts. There is a possibility that.

JP 2011-19395 A

  In view of the above, a low voltage circuit such as a relatively low voltage control device and a high voltage circuit such as a relatively high voltage drive circuit are appropriately arranged to achieve downsizing of the inverter control board. Technology is desired.

In view of the above, an inverter control board that is provided between the first AC machine, which is an AC electrical device, and a high-voltage DC power source and that controls an inverter that converts power between DC and AC is one aspect. ,
A low-voltage circuit area having a reference potential as a negative electrode of a low-voltage DC power supply having a lower voltage than the high-voltage DC power supply;
Including a circuit region having a negative potential of the high-voltage DC power supply as a reference potential, and having a high-voltage circuit region insulated from the low-voltage circuit region,
A plurality of drive circuits for individually applying a driving force to each switching control signal for controlling each of a plurality of switching elements included in the inverter, and an AC electric device that operates using the high-voltage DC power source as a driving force source A second alternator control circuit for controlling a second alternator different from the first alternator is provided in the high-voltage circuit region,
A power supply control circuit for controlling a plurality of switching power supplies that respectively supply power to each of the drive circuits and the second AC machine control circuit; and a first AC machine control circuit that generates and outputs the switching control signal And in the low-voltage circuit region,
The high voltage circuit region includes a first high voltage circuit region in which the drive circuit corresponding to the upper switching element of the inverter is disposed, and a second high voltage circuit in which the drive circuit corresponding to the lower switching element of the inverter is disposed. Divided into circuit areas,
The low-voltage circuit region is formed between the first high-voltage circuit region and the second high-voltage circuit region,
The second AC machine control circuit is disposed in the second high voltage circuit region.

  According to this configuration, the inverter control board has the high-voltage circuit region that uses the negative electrode of the high-voltage DC power supply as a reference potential and the low-voltage circuit region that uses the negative electrode of the low-voltage DC power supply as a reference potential. The circuit device can be appropriately arranged. A drive circuit for driving the first alternator and a second alternator control circuit for controlling the second alternator are arranged in the high voltage circuit area. A circuit device such as the second alternator control circuit is often constituted by an electronic circuit and is generally arranged in a low-voltage circuit region. However, by arranging the second AC machine control circuit in the high-voltage circuit region, the second AC machine control circuit controls the second AC machine within the circuit range of the same system electrically without using an insulating circuit. be able to. That is, the inverter control board can be miniaturized by the amount that an insulating circuit or the like is not required.

  Moreover, since the potential of the upper switching element on the inverter differs between the positive side and the neutral point side depending on the switching state of the switching element, it is necessary to maintain a floating relationship with each other. The potential is common. Therefore, in the second high voltage circuit region, the insulation distance between the drive circuits can be made shorter than the insulation distance in the first high voltage circuit region. That is, the second high voltage circuit region has a larger mounting area than the first high voltage circuit region. Although the second AC machine control circuit is arranged in the second high voltage circuit region, there is a margin in the second high voltage circuit region, so that the scale of the inverter control board is not greatly increased.

  As described above, according to this configuration, a low voltage circuit such as a control device having a relatively low voltage and a high voltage circuit such as a drive circuit having a relatively high voltage are appropriately arranged, and the inverter control board Miniaturization can be realized.

  Further features and advantages of the inverter control board will become clear from the following description of embodiments described with reference to the drawings.

Block diagram schematically showing the configuration of the rotating electrical machine control device Block diagram schematically showing the configuration of the inverter control board and its periphery Regulator element outline drawing Outline drawing of insulator element Schematic circuit block diagram of switching power supply and power supply control circuit Transformer outline drawing Outline drawing of discharge resistance Schematic layout of circuit area and wiring pattern on inverter control board The top view which shows typically the laying example of the 1st wiring pattern and the 2nd wiring pattern in the boundary part of a low voltage | pressure circuit area | region and a 1st arrangement | positioning area | region. Schematic cross-sectional view of the connection location between the first wiring pattern and the isolation element Schematic cross-sectional view of the connection point between the second wiring pattern and the transformer The top view which shows typically the example of another laying of a 1st wiring pattern and a 2nd wiring pattern The top view which shows typically the laying example in which a 1st wiring pattern and a 2nd wiring pattern cross | intersect

  Hereinafter, embodiments of an inverter control board will be described with reference to the drawings. In the present embodiment, an inverter control board 10 serving as the core of a rotating electrical machine control device 1 for driving and controlling a rotating electrical machine (AC electrical equipment) that is a driving force source for wheels of a vehicle such as a hybrid vehicle will be described as an example. . The block diagram of FIG. 1 schematically shows the configuration of the rotating electrical machine control device 1 with the inverter 5 as the center. The block diagram of FIG. 2 schematically shows the configuration of the rotating electrical machine control device 1 with the inverter control board 10 as the center.

  The rotating electrical machine control device 1 includes an AC first rotating electrical machine M1 (first AC machine) that serves as a driving force source for the vehicle and an AC first rotating electrical machine that serves as a driving force source for an accessory device (auxiliary machine) mounted on the vehicle. Controls the two-rotary electric machine M2 (second AC machine). Here, the auxiliary machine is, for example, an electric oil pump or an air conditioner compressor. The first rotating electrical machine M1 as a driving force source of the vehicle is a rotating electrical machine that operates by a plurality of phases of alternating current (here, three-phase alternating current), and can function as both an electric motor and a generator. In the present embodiment, the second rotating electrical machine M2 is also a rotating electrical machine that operates by three-phase alternating current. In this embodiment, although the form in which both the first AC machine and the second AC machine are rotating electric machines is illustrated, AC electric equipment other than rotating electric machines may be used.

  In vehicles such as automobiles that cannot be supplied with electric power from the outside, secondary batteries (batteries) such as nickel metal hydride batteries and lithium ion batteries, and electric double layer capacitors are used as power sources for driving rotating electrical machines. A DC power supply is installed. In the present embodiment, as a large-voltage, large-capacity DC power supply for supplying driving power to the first rotating electrical machine M1 and the second rotating electrical machine M2, for example, the high-voltage battery 3 (high-voltage DC) having a power supply voltage of 200 to 400 [V] Power supply). In addition, the high voltage battery 3 can also store the electric power generated by the first rotating electrical machine M1, for example.

  Since the first rotating electrical machine M1 and the second rotating electrical machine M2 are alternating current rotating electrical machines, power conversion is performed between the high voltage battery 3 and each rotating electrical machine (M1, M2) between the direct current and the alternating current. An inverter 5 for performing is provided. A first inverter 5A is provided between the high-voltage battery 3 and the first rotating electrical machine M1, and a second inverter 5B is provided between the high-voltage battery 3 and the second rotating electrical machine M2. The first inverter 5 </ b> A and the second inverter 5 </ b> B are connected to the high-voltage battery 3 in parallel with each other.

  Between the first inverter 5 </ b> A and the second inverter 5 </ b> B and the high voltage battery 3, a smoothing capacitor C (DC link capacitor) that smoothes a DC voltage (DC link voltage) is provided. The smoothing capacitor C stabilizes the DC voltage that fluctuates according to fluctuations in the power consumption of the first rotating electrical machine M1 and the second rotating electrical machine M2. In the present embodiment, an example in which the first smoothing capacitor C1 is disposed at a position close to the first inverter 5A and the second smoothing capacitor C2 is disposed at a position close to the second inverter 5B is illustrated. In the present embodiment, the second smoothing capacitor C2 is mounted on the inverter control board 10. The two smoothing capacitors C are electrically connected in parallel.

  Between the smoothing capacitor C and the high voltage battery 3, a contactor 2 capable of disconnecting the circuit from the smoothing capacitor C to the rotating electric machine (M1, M2) and the high voltage battery 3 is provided. Yes. In the present embodiment, the contactor 2 is a mechanical relay that opens and closes based on a command from a vehicle ECU (Electronic Control Unit) 61 that is one of the highest control devices of the vehicle. For example, a system main relay (SMR: System Main Relay).

  In the present embodiment, each of the first inverter 5A and the second inverter 5B is configured as an IPM (Intelligent Power Module) in which a bridge circuit by the switching element E is constructed in one housing. As shown in FIG. 1, the IPM includes an upper switching element (E1, E3) connected to the positive electrode side of the high voltage battery 3 (high voltage power source positive electrode P side) and the negative electrode side of the high voltage battery 3 (high voltage power source negative electrode). A bridge circuit is configured in which an arm in which lower switching elements (E2, E4) connected to N side) are connected in series is connected in parallel in a plurality of phases according to the number of AC phases. FIG. 1 illustrates a form in which an IGBT (Insulated Gate Bipolar Transistor) is used as the switching element E. The first inverter 5A and the second inverter 5B are circuits having the same bridge circuit structure, but different electrical characteristics (such as rated current and withstand voltage) of the individual switching elements E.

  The switching element E included in the first inverter 5A and the second inverter 5B is controlled by a switching control signal generated by the inverter control circuit (11, 12). As shown in FIG. 2, the first inverter 5A is controlled by a first inverter control circuit 11 (first AC machine control circuit), and the second inverter 5B is a second inverter control circuit 12 (second AC machine control circuit). ). These inverter control circuits (11, 12) are constituted by electronic circuits that are the core of a logical operation processor such as a microcomputer. In many cases, the power supply voltage of such an electronic circuit is about 1.5 to 5 [V], which is much lower than the power supply voltage of the high voltage battery 3 (200 to 400 [V] as described above). It is. For this reason, the switching control signal output from the inverter control circuit (11, 12) cannot directly drive the switching element E of the inverter 5, and the connection between the inverter control circuit (11, 12) and the inverter 5 is not possible. In many cases, a drive circuit is provided. The drive circuit indicated by the symbol “D” in FIG. 2 is an example.

  On the inverter control board 10, a circuit group for driving and controlling the first rotating electrical machine M1 and the second rotating electrical machine M2 is mounted. However, as compared with the first rotating electrical machine M1 that drives the vehicle, the second rotating electrical machine M2 that drives the accessory has a smaller output (torque, etc.) and consumes less power. For this reason, the circuit scale for driving and controlling the second rotating electrical machine M2 is smaller than the circuit group for driving and controlling the first rotating electrical machine M1. Therefore, the inverter control board 10 of the present embodiment is configured with a circuit group for driving and controlling the first rotating electrical machine M1 as a core, and a circuit group for driving and controlling the second rotating electrical machine M2 is merged there. Can do.

  The necessary control is also different between the first rotating electrical machine M1 for driving the wheels and the second rotating electrical machine M2 for driving the auxiliary machines. For this reason, a circuit board on which a circuit for controlling the first rotating electrical machine M1 is mounted via the first inverter 5A and a circuit for controlling the second rotating electrical machine M2 via the second inverter 5B are mounted. In many cases, a separate circuit board is provided. However, considering the miniaturization of the entire device mounted on the vehicle, it is often more efficient to mount both circuits together on the same substrate. Therefore, in this embodiment, both circuits are mounted together on the same circuit board.

  Since the first rotating electrical machine M1 that drives the wheels has a large output, the withstand voltage and current consumption of the switching element E constituting the first inverter 5A are also large. For this reason, the IPM constituting the first inverter 5A is not mounted on the inverter control board 10, but is arranged separately from the inverter control board 10, and is electrically connected by a wiring cable, a bus bar, or the like. Therefore, the inverter control board 10 is configured with a circuit group that controls the first inverter 5A as a core. In addition, since IPM which comprises the 2nd inverter 5B is small compared with IPM which comprises the 1st inverter 5A, it is mounted on the inverter control board 10 in this embodiment.

  Incidentally, as described above, both the first inverter 5 </ b> A and the second inverter 5 </ b> B are electrically connected to the high voltage battery 3. On the other hand, the power supply voltage for operating the inverter control circuits (11, 12) that control both inverters (5 A, 5 B) is much lower than the high voltage battery 3. When such a low-voltage power supply voltage is generated from the output of the high-voltage battery 3, energy loss increases, so another power supply is used. Generally, in addition to the high-voltage battery 3, a low-voltage battery 6 (low-voltage DC power supply) that is a power source having a lower voltage than the high-voltage battery 3 is mounted on the vehicle. The power supply voltage of the low voltage battery 6 is, for example, 12 to 24 [V]. The low-voltage battery 6 supplies power to electrical components such as an audio system, a lighting device, room lighting, instrument illumination, and a power window, and a control device that controls these components. The low voltage battery 6 and the high voltage battery 3 are insulated from each other and are in an electrically floating relationship with each other.

  As shown in FIG. 2, a low voltage battery 6 is connected to the inverter control board 10. The inverter control board 10 includes a power input circuit 16 configured to include a noise filter, a smoothing capacitor, a regulator circuit, and the like. The low-voltage battery 6 is a DC power supply having a potential difference of approximately 12 to 24 [V] between a positive electrode (low-voltage power supply positive electrode B) and a negative electrode (low-voltage power supply negative electrode G). On the other hand, the operating voltage of the first inverter control circuit 11 is about 1.5 to 5 [V] as described above. Therefore, a first voltage adjustment circuit 14 is provided for adjusting the voltage input from the low voltage battery 6 to this operating voltage (rated voltage). In the present embodiment, the first voltage regulator circuit 14 is configured with the first regulator element LR1 as the core.

  In the present embodiment, the first regulator element LR1 is a linear regulator that is a semiconductor element incorporating a transistor, an operational amplifier, a reference voltage generation circuit, and the like. In the present embodiment, as shown in FIG. 3, a surface-mount linear regulator LR having a semiconductor circuit BD built in a resin body BD and having seven signal terminals ST is illustrated. For example, the center of the seven terminals is assigned to the ground terminal Vg (reference potential terminal), and the input terminal Vin and the output terminal Vout are assigned to both sides thereof. The other terminals are terminals used for other purposes such as unconnected terminals and control signal inputs. A wide mounting terminal IT that can be soldered when mounted on a circuit board is provided on the opposite side of the seven terminals across the package body. In the present embodiment, the mounting terminal IT is connected to the ground terminal Vg in the main body BD, and the mounting terminal IT also functions as the ground terminal Vg. The mounting terminal IT is provided over almost the entire back surface (side contacting the circuit board) of the main body BD, and the heat generated by the linear regulator LR is transferred to the circuit board via the main body BD and the mounting terminal IT. It also has a role as a heat conductor to propagate.

  The first voltage adjustment circuit 14 includes a first regulator element LR1 and a bypass capacitor connected to the first regulator element LR1. For example, a voltage of 12 [V] is input to the input terminal Vin of the first regulator element LR1, and a constant output voltage V1 (1.5 to 5 [V]) corresponding to the electrical characteristics of the first regulator element LR1 is obtained. Output from the output terminal Vout. The difference between the input voltage and the output voltage is converted into heat in the first regulator element LR1. The first voltage adjustment circuit 14 may include a resistance voltage dividing circuit. In this case, the input voltage applied to the input terminal Vin can be reduced. As a result, the energy converted into heat in the first regulator element LR1 is reduced, so that the heat generation of the first regulator element LR1 can be suppressed.

  As shown in FIG. 2, the first inverter control circuit 11 operates using the voltage (voltage between V1 and G) adjusted by the first voltage adjustment circuit 14 as an operating voltage. The first inverter control circuit 11 controls the first rotating electrical machine M1 in accordance with a command acquired by communication via a CAN (Controller Area Network) or the like from the vehicle ECU 61 or the like that controls the operation of the vehicle. In the present embodiment, the first inverter control circuit 11 communicates with the vehicle ECU 61 via the communication control circuit 17. The first inverter control circuit 11 feedback-controls the first rotating electrical machine M1 using the detection results of the current sensor 63 and the rotation sensor 65. The current sensor 63 detects a current flowing through the stator coil of the first rotating electrical machine M1. A rotation sensor 65 such as a resolver detects the rotation (rotational speed and magnetic pole position) of the first rotating electrical machine M1.

  By the way, although the first inverter 5A is connected to the high voltage battery 3, the first inverter control circuit 11 is connected to the low voltage battery 6 as described above. Further, since the high voltage battery 3 and the low voltage battery 6 are insulated, the first inverter 5A and the first inverter control circuit 11 are in an electrically floating relationship with each other. Accordingly, the switching control signal generated by the first inverter control circuit 11 is transmitted from the first inverter control circuit 11 to the first inverter 5A via the isolation element 4 (insulated signal transmission element). In this embodiment, an isolation element 4 in which a plurality of photocouplers or a plurality of magnetic couplers are incorporated in one package is used. FIG. 4 illustrates an example in which a photocoupler is incorporated. In the present embodiment, an abnormality detection signal that is a detection result of an abnormality such as overcurrent or overheating of the switching element E is output from the IPM that constitutes the first inverter 5A. Since such a signal is fed back to the first inverter control circuit 11, the transmission direction is opposite to the switching control signal. For this reason, the isolation element 4 includes a plurality of photocouplers (a plurality of magnetic couplers) so that signal transmission in different directions is possible.

  In addition, as described above, the switching control signal output from the first inverter control circuit 11 cannot directly drive the switching element E of the first inverter 5A, so the first inverter control circuit 11 and the first inverter A drive circuit D is provided between 5A. The drive circuit D is provided, for example, between the gate terminal and the emitter terminal of the IGBT in order to apply a voltage necessary for turning on the gate. For this reason, basically, a different power source is required for each drive circuit D corresponding to each switching element E, and of course, it is necessary to be insulated from the low voltage battery 6. Therefore, the switching power supply S that supplies power to the drive circuit D is configured by using a transformer T (insulating transformer) as shown in FIG. The transformer T is a known insulating component that transmits signals and energy by electromagnetic coupling between the primary side coil and the secondary side coil. Therefore, it is possible to supply power to the drive circuit D and the like while maintaining insulation between the primary side circuit and the secondary side circuit. In the present embodiment, as illustrated in FIG. 6, a transformer T in which a primary side coil and a secondary side coil are incorporated in one package is illustrated.

  In the present embodiment, seven switching power supplies S (S1 to S7) are provided corresponding to the six arms of the first inverter 5A and the second inverter control circuit 12, respectively. Each switching power supply S is configured to have one transformer T, and the seven switching power supplies S (S1 to S7) are each configured to have one transformer T (T1 to T7). The primary voltage V10 is applied in common to all the transformers T. The primary voltage V10 to the transformer T is stabilized and supplied to a constant voltage by the power input circuit 16 and the first voltage adjustment circuit 14. Secondary voltage V20 (V21-V27) is output from each transformer T (T1-T7), respectively. Each transformer T (T1 to T7) has the same configuration, and a secondary voltage V20 having substantially the same voltage is output from at least six transformers T (T1 to T6). In the present embodiment, a secondary voltage V20 of 15 to 20 [V] is output. The diode in FIG. 5 is a rectifying diode, the secondary capacitor is a smoothing capacitor, and the primary capacitor is a primary voltage stabilizing capacitor.

  A power control circuit 15 is configured on the inverter control board 10 and controls a transformer T as a switching power supply S. The power supply control circuit 15 includes transistors (15b, 15c) that control the voltage applied to the primary coil and a control circuit 15a that controls the transistors (15b, 15c). The power supply control circuit 15 of the present embodiment employs a push-pull type configuration. Although seven transformers T are provided, the power supply control circuit 15 controls all the transformers T at once. In the present embodiment, as described above, since the primary voltage V10 to the transformer T is stabilized, the secondary voltage V20 is fed back according to the transformation ratio of the transformer T without feeding back the secondary voltage V20 to the primary side. V20 is determined.

  Six of the seven switching power supplies S (S1 to S7) are drive circuit power supplies (S1 to S6) for separately supplying power to the six drive circuits D (D1 to D6), and the remaining one Is a switching power supply S7 for the second inverter. The second inverter switching power supply S7 is a power source of the second inverter control circuit 12 (second AC machine control circuit), but the output of the switching power supply S generally has a large ripple component. Further, as described above, the second inverter control circuit 12 is configured by an electronic circuit having a microcomputer or the like as the core, like the first inverter control circuit 11. The operating voltage (1.5 to 5 [V]) of such an electronic circuit is lower than the operating voltage of the drive circuit D. For this reason, power is supplied to the second inverter control circuit 12 via the second voltage adjustment circuit 13. The second voltage adjustment circuit 13 adjusts the output voltage of the second inverter switching power supply S7 to the operating voltage (rated voltage) of the second inverter control circuit 12.

  Similar to the first voltage adjustment circuit 14, the second voltage adjustment circuit 13 is configured with a linear regulator (second regulator element LR2), which is a semiconductor element incorporating a transistor, an operational amplifier, a reference voltage generation circuit, and the like, as a core. . The structure of the second regulator element LR2 is as described above with reference to FIG. Similar to the first voltage adjustment circuit 14, the second voltage adjustment circuit 13 includes a second regulator element LR2, a bypass capacitor connected to the second regulator element LR2, and the like. For example, a voltage of 15 to 20 [V] (an output voltage of the second inverter switching power supply S7) is input to the input terminal Vin of the second regulator element LR2, and the voltage is constant according to the electrical characteristics of the second regulator element LR2. The output voltage V2 (1.5 to 5 [V]) is output from the output terminal Vout.

  The difference between the input voltage and the output voltage is converted into heat in the second regulator element LR2. As described above, the second voltage adjustment circuit 13 may include a resistance voltage dividing circuit. In this case, the input voltage applied to the input terminal Vin can be reduced. As a result, the energy converted into heat in the second regulator element LR2 is reduced, so that the heat generation of the second regulator element LR2 can be suppressed. 2, the negative electrodes of the second inverter switching power supply S7, the second voltage adjustment circuit 13, and the second inverter control circuit 12 are a high-voltage power supply negative electrode N.

  By the way, as described above, the electrical connection between the smoothing capacitor C and the high-voltage battery 3 and the circuit from the smoothing capacitor C to the rotating electric machine (M1, M2) and the high-voltage battery 3 can be disconnected. A contactor 2 is provided. When the contactor 2 is switched from the closed state to the open state, the supply of power from the high voltage battery 3 to the inverter 5 side is immediately cut off. However, a smoothing capacitor C is connected between the contactor 2 and the inverter 5, and the smoothing capacitor C is charged until it has the same potential as the high-voltage battery 3. Therefore, even if the contactor 2 is in an open state, the DC link voltage is high until the smoothing capacitor C is sufficiently discharged.

  The power supply voltage of the high voltage battery 3 is 200 to 400 [V] as described above. Therefore, even after the contactor 2 is opened, the voltage across the terminals of the smoothing capacitor C does not decrease immediately. For example, when performing maintenance of the first rotating electrical machine M1, the second rotating electrical machine M2, the first inverter 5A, and the second inverter 5B, it is necessary to wait until the potential of the smoothing capacitor C is sufficiently lowered. This waiting time is preferably as short as possible. Therefore, as shown in FIG. 1, a discharge circuit DC is provided so that the remaining charge of the smoothing capacitor C can be discharged quickly. The discharge circuit DC is configured as a series circuit of a discharge resistor R and a discharge control switch DS (for example, a relay or an FET (field effect transistor)), and is connected in parallel to the smoothing capacitor C. When the discharge control switch DS is turned on, both ends of the smoothing capacitor C are short-circuited by the discharge circuit DC, and the remaining charge accumulated in the smoothing capacitor C is consumed as heat by the discharge resistor R. In the present embodiment, the vehicle ECU 61 exemplifies a mode in which the opening / closing control of the discharge control switch DS is performed (see FIG. 1), but the opening / closing control may be performed by other control means. For example, the discharge control switch DS may be controlled to open and close by the first inverter control circuit 11, the second inverter control circuit 12, other discharge control circuits (not shown), and the like.

  The discharge resistor R has a relatively low resistance value and a large calorific value in order to discharge the smoothing capacitor C by flowing a large current. Therefore, in this embodiment, the discharge resistor R is configured by parallel connection of two resistors (first discharge resistor R1 and second discharge resistor R2). Of course, the discharge resistor R may be constituted by one resistor or three or more resistors. Moreover, when the discharge resistance R is comprised in a several resistor, you may connect not only in parallel connection but in series connection or the combination of series connection and parallel connection. Further, in the present embodiment, as shown in FIG. 7, a resistor encapsulated in a resin package that has a large contact area with the circuit board and can be appropriately used as a heat sink is used. The discharge resistor R has a first terminal p1 and a second terminal p2 as signal terminals ST, and a mounting terminal IT for soldering the main body BD of the discharge resistor to the circuit board. The mounting terminal IT is provided almost over the back surface of the main body BD (the side in contact with the circuit board), and heat generated by the resistor is transferred to the main body BD and the mounting terminal IT circuit board. It also has a role as a conductor.

  As described above, the rotating electrical machine control device 1 is connected to the high voltage battery 3 and the low voltage battery 6. The inverter control board 10 includes a low-voltage circuit region LV that uses the negative electrode (low-voltage power supply negative electrode G) of the low-voltage battery 6 as a reference potential, and a circuit region that uses the negative electrode (high-voltage power supply negative electrode N) of the high-voltage battery 3 as a reference potential. The low-voltage circuit region LV is configured to have an insulated high-voltage circuit region HV. FIG. 8 schematically shows such a circuit area in the inverter control board 10. Each circuit region is appropriately insulated by an insulation region IR.

  The high voltage circuit region HV includes a first high voltage circuit region HV1 in which drive circuits D (D1 to D3) corresponding to the upper switching element E1 of the first inverter 5A are disposed, and a lower switching element E2 of the first inverter 5A. The drive circuit D (D4 to D6) and the second inverter control circuit 12 corresponding to the corresponding drive circuit D (D4 to D6) are divided into the second high voltage circuit region HV2.

  As shown in FIG. 2, the first high-voltage circuit region HV1 has a U-phase upper-side high-voltage circuit region HV11, a V-phase upper-side high-voltage circuit region HV12, and a W-phase upper-side high-voltage circuit region HV13. The U-phase upper-stage high-voltage circuit area HV11 is a circuit area in which the U-phase upper-stage drive circuit D1 corresponding to the switching element E on the U-phase upper stage is disposed. The V-phase upper-stage high-voltage circuit region HV12 is a circuit region in which the V-phase upper-stage drive circuit D2 corresponding to the switching element E on the V-phase upper stage is disposed. The W-phase upper-stage high-voltage circuit region HV13 is a circuit region in which the W-phase upper-stage drive circuit D3 corresponding to the switching element E on the W-phase upper stage is disposed. These three circuit regions (HV11, HV12, HV13) belonging to the first high-voltage circuit region HV1 are not in common with each other and have a floating relationship.

  As shown in FIG. 2, the second high-voltage circuit area HV2 includes a U-phase lower-stage high-voltage circuit area HV21, a V-phase lower-stage high-voltage circuit area HV22, a W-phase lower-stage high-voltage circuit area HV23, and a second inverter high-voltage circuit area. It has HV20. The U-phase lower-stage high-voltage circuit region HV21 is a circuit region in which the U-phase lower-stage drive circuit D4 corresponding to the switching element E on the U-phase lower stage is disposed. The V-phase lower-stage high-voltage circuit region HV22 is a circuit region in which the V-phase lower-stage drive circuit D5 corresponding to the switching element E on the V-phase lower stage is disposed. The W-phase lower-stage high-voltage circuit region HV23 is a circuit region in which the W-phase lower-stage drive circuit D6 corresponding to the switching element E on the W-phase lower stage is disposed. The second inverter high-voltage circuit region HV20 is a circuit region in which the second inverter control circuit 12, the second voltage adjustment circuit 13, the second inverter 5B, the discharge resistor R, the second smoothing capacitor C2, and the like are arranged.

  These four circuit regions (HV20, HV21, HV22, HV23) belonging to the second high-voltage circuit region HV2 are electrically insulated from each other, but all of the negative electrode (high-voltage power supply negative electrode N) of the high-voltage battery 3 is used as a reference potential. Is a circuit area. Therefore, as shown in FIG. 8, in the second high-voltage circuit region HV2, the insulating region IR provided at the boundary of the four circuit regions (HV20, HV21, HV22, HV23) has three circuits in the first high-voltage circuit region HV1. The insulation distance is set shorter than the insulation region IR provided at the boundary between the regions (HV11, HV12, HV13). For this reason, compared with 1st high voltage circuit area | region HV1, the area which can be utilized in order to mount components becomes larger in 2nd high voltage circuit area HV2. Therefore, the second inverter high-voltage circuit region HV20 is provided in the second high-voltage circuit region HV2.

  The low voltage circuit area LV is formed between the first high voltage circuit area HV1 and the second high voltage circuit area HV2. An insulating region IR is also provided at the boundary between the low-voltage circuit region LV and the first high-voltage circuit region HV1 and at the boundary between the low-voltage circuit region LV and the second high-voltage circuit region HV2. That is, the insulating region IR is also provided at the boundary between the low voltage circuit region LV and the high voltage circuit region HV.

  At least the first inverter control circuit 11 and the power supply control circuit 15 are arranged in the low-voltage circuit region LV. The low-voltage circuit region LV is sandwiched between the first high-voltage circuit region HV1 and the second high-voltage circuit region HV2, and the upper drive circuit D (D1 to D3) is disposed in the first high-voltage circuit region HV1, The lower drive circuit D (D4 to D6) is disposed in the high voltage circuit area HV2. Therefore, the switching control signal can be wired from the first inverter control circuit 11 to each drive circuit D with a substantially equal wiring distance. More precisely, a switching control signal is wired from the first inverter control circuit 11 to each isolation element 4 (41 to 46), details of which will be described later.

  In addition, switching power supplies S (S1 to S6) for supplying power to the high-voltage circuit regions (HV11, HV12, HV13, HV21, HV22, HV23) in which the drive circuits D are arranged are provided. Yes. The second high-voltage circuit area HV2 is also provided with a second inverter high-voltage circuit area HV20. The switching power supply S for supplying power to the second inverter control circuit 12 is provided in the circuit area (HV20). (S7) is provided. The power supply control circuit 15 for controlling these switching power supplies S (S1 to S7) is also disposed in the low voltage circuit area LV sandwiched between the first high voltage circuit area HV1 and the second high voltage circuit area HV2. Therefore, each switching power supply S (S1 to S7) can be controlled with a substantially equal wiring distance from the power supply control circuit 15.

  By the way, as shown in FIG. 8, the first high-voltage circuit area HV1 includes a plurality of first arrangement areas LA1 in which the upper drive circuits D (D1 to D3) are arranged. The second high voltage circuit area HV2 includes a plurality of first arrangement areas LA1 in which the lower drive circuits D (D4 to D6) are arranged, and a second inverter control circuit 12 is arranged in the second. It includes an arrangement area LA2. In other words, the first high-voltage circuit area HV1 and the second high-voltage circuit area HV2 include a plurality of first arrangement areas LA1 in which the drive circuits D (D1 to D6) are arranged, and the second high-voltage circuit area HV2 is Furthermore, it includes a second arrangement area LA2 in which the second inverter control circuit 12 is arranged.

  As described above, the switching power supply S (S1 to S7) is a transformer type switching power supply in which the transformers T (T1 to T7) are arranged across the high voltage circuit region HV and the low voltage circuit region LV. Further, the isolation elements 4 (41 to 46) that transmit signals including switching control signals in an electrically insulated state are also arranged across the high-voltage circuit region HV and the low-voltage circuit region LV. That is, the transformer T (T1 to T6) corresponding to each drive circuit D (D1 to D6) and the drive circuit D (D1 to D6) across the low voltage circuit area LV and each first arrangement area LA1. Isolation elements 4 (41 to 46) corresponding to are arranged. Specifically, the U-phase upper-stage transformer T1 (U-phase) corresponding to the U-phase upper-stage drive circuit D1 straddling the low-voltage circuit area LV and the U-phase upper-stage high-voltage circuit area HV11 (first arrangement area LA1). A U-phase upper-stage isolation element 41 corresponding to the upper-stage switching power supply S1) and the U-phase upper-stage drive circuit D1 is arranged.

  The same applies to the V-phase upper-side high-voltage circuit region HV12, the W-phase upper-side high-voltage circuit region HV13, the U-phase lower-side high-voltage circuit region HV21, the V-phase lower-side high-voltage circuit region HV22, and the W-phase lower-side high-voltage circuit region HV23. is there. In the description of the U-phase upper-side high-voltage circuit region HV11, the drive circuit D is replaced with each drive circuit (D2 to D6), and the transformer T (switching power supply S) is replaced with the V-phase upper-stage transformer T2 (V-phase upper Side switching power supply S2), W phase upper stage transformer T3 (W phase upper stage switching power supply S3), U phase lower stage transformer T4 (U phase lower stage switching power supply S4), V phase lower stage transformer T5 (V phase lower stage switching) Power supply S5), W-phase lower-stage transformer T6 (W-phase lower-stage switching power supply S6), and isolation elements 4 are respectively V-phase upper-stage isolation element 42, W-phase upper-stage isolation element 43, and U-phase lower-stage. Side isolation element 44, V-phase lower stage isolation element 45, W-phase lower stage isolation element It may be read as to 46.

  Further, a transformer T (second inverter transformer T7) corresponding to the second inverter control circuit 12 is disposed across the low voltage circuit region LV and the second arrangement region LA2. Specifically, the second inverter transformer T7 (second inverter) corresponding to the second inverter control circuit 12 straddling the low voltage circuit region LV and the second inverter high voltage circuit region HV20 (second arrangement region LA2). Switching power supply S7).

  As shown in FIG. 8, the first inverter control circuit 11 and each isolation element 4 (41 to 46) are connected by a first wiring pattern WP1. The power supply control circuit 15 and each transformer T (T1 to T7) are connected by the second wiring pattern WP2. As shown in FIG. 8, the first wiring pattern WP1 and the second wiring pattern WP2 are formed so as to surround at least a part of the first wiring pattern WP1 without intersecting each other. . Naturally, the first wiring pattern WP1 may be formed so as to surround at least a part of the second wiring pattern WP2. That is, it is preferable that the first wiring pattern WP1 and the second wiring pattern WP2 are formed so that one wiring pattern surrounds at least a part of the other wiring pattern without crossing each other.

  The first wiring pattern WP1 is a wiring pattern through which a switching control signal output from the first inverter control circuit 11 with a relatively small signal voltage amplitude and a small signal current value passes. On the other hand, the second wiring pattern WP2 is a wiring pattern through which a signal having a relatively large voltage amplitude and a large current value passes because it is connected to the switching power supply S (transformer T). Since the signal passing through the first wiring pattern WP1 does not have high noise resistance, when the first wiring pattern WP1 and the second wiring pattern WP2 are close to each other, the signal passing through the first wiring pattern WP1 is susceptible to noise. Therefore, for example, as shown in FIG. 13 shown as a comparative example, it is preferable that the first wiring pattern WP1 and the second wiring pattern WP2 do not cross each other and are not formed close to each other.

  As shown in FIG. 8, in the present embodiment, the first wiring pattern WP1 and the second wiring pattern WP2 are U-shaped with the opening directions facing the opposite directions. If both the wiring patterns have such a shape, the bottom portions of the U-shape are greatly separated from each other, so that both the wiring patterns can be appropriately separated. Further, by arranging the first inverter control circuit 11 and the power supply control circuit 15 in the vicinity of the bottom, the first inverter control circuit 11 and the power supply control circuit 15 are placed at substantially equivalent positions with respect to the U-shaped side arms. Can be arranged.

  In the present embodiment, the second wiring pattern WP2 is formed so as to surround at least a part of the first wiring pattern WP1. As described above, the signal passing through the second wiring pattern WP2 has a larger voltage amplitude and a larger current value than the signal passing through the first wiring pattern WP1. Since the low-voltage circuit region LV is sandwiched between the high-voltage circuit regions HV, if the second wiring pattern WP2 is disposed outside the first wiring pattern WP1, the second wiring pattern WP2 is more of the high-voltage circuit region HV. Will be placed on the side. The high-voltage circuit region HV is more likely to be a source of noise than the low-voltage circuit region LV because there are many signals with high voltages and large current values. The second wiring pattern WP2 that transmits a signal having a large voltage amplitude, a large current value, and a high noise resistance is arranged on the high voltage circuit region HV side, so that the first wiring pattern WP1 having a relatively low noise resistance. Can reduce the effect of noise.

  9 to 11 schematically show an example of laying the first wiring pattern WP1 and the second wiring pattern WP2 at the boundary between the low-voltage circuit region LV and the first arrangement region LA1. As shown in FIG. 9, the first wiring pattern WP1 passes through the outside of the isolation element 4 and the transformer T in the direction along the substrate surface and is connected to the signal terminal ST of the isolation element 4. The second wiring pattern WP2 passes below the isolation element 4 and the main body BD of the transformer T, and is connected to the signal terminal ST of the transformer T from below the main body of the transformer T. As shown in FIGS. 10 and 11, the first wiring pattern WP1 and the second wiring pattern WP2 are wired through the inner layer of the circuit board, and the pads PD provided on the surface layer in the vicinity of the signal terminal ST of the connection destination. Connected. When the wiring pattern passes through the inner layer, the insulation distance from the high-voltage circuit region HV can be made longer than when it passes through the surface layer.

  As described above, a drive device for a relatively large output AC electrical device using a DC power source as a power source includes a control device using an electronic circuit, an inverter that converts power between DC and AC, and the control Many circuit devices such as a drive circuit that applies an electric driving force to a control signal output from the device and supplies the drive signal to the inverter and an insulated power source that generates driving power for the drive circuit are included. Among these circuit devices, for example, a control device, a drive circuit, an insulated power source, and the like are preferably constructed on one circuit board. Further, if the above-described high-output AC electrical device is a primary device, a secondary device that is an auxiliary electrical device may be used together with the primary device. For example, in a car, a rotating electrical machine that serves as a driving force source for wheels is a primary device, and a rotating electrical machine that serves as a power source for an air conditioner compressor or oil pump is a secondary device.

  In a device to be mounted on which such an electric device is mounted, such as an automobile, it is desired that the primary device and the secondary device, and the driving device for these devices be mounted in a space-saving manner. Accordingly, in the drive device for the primary device as described above, for example, a circuit device that constitutes the control device for the secondary device on the circuit board (control board) on which the control device for the primary device, the drive circuit, the insulated power source, and the like are mounted. It is preferable to be mounted. Similarly to the primary device, when the secondary device is an AC electrical device, a circuit device similar to the primary device such as an inverter is required, and generally the circuit scale is often increased. However, in the inverter control board (10) exemplified as one aspect in the above, circuit devices are appropriately arranged in two types of regions (high voltage circuit region (HV) and low voltage circuit region (LV)) having different reference potentials. In addition, space saving can be realized by performing appropriate wiring.

  In the embodiment described above, the inverter control board (10) includes the high voltage circuit region (HV) having the negative electrode (N) of the high voltage DC power supply (3) as a reference potential and the negative electrode (G) of the low voltage DC power supply (6). Since the low-voltage circuit region (LV) serving as the reference potential is included, a plurality of circuit devices in a floating relationship can be appropriately disposed. In the high voltage circuit area (HV), a drive circuit (D) for driving the first AC machine (M1), a second AC machine control circuit (12) for controlling the second AC machine (M2), Is placed. A circuit device such as the second alternator control circuit (12) is often constituted by an electronic circuit and is generally arranged in a low-voltage circuit area (LV). However, by arranging the second AC machine control circuit (12) in the high voltage circuit region (HV), the second AC machine control circuit (12) can be electrically connected to the same circuit range without using an insulating circuit. The second alternator (M2) can be controlled within. That is, the inverter control board (10) can be reduced in size because an insulating circuit or the like is not required.

  The high voltage circuit area (HV) includes a first high voltage circuit area (HV1) in which drive circuits (D (D1 to D3)) corresponding to the upper switching element (E1) of the inverter (5A) are arranged, and an inverter (5A) It is divided into a second high voltage circuit region in which drive circuits (D (D4 to D6)) corresponding to the lower switching element (E2) are arranged. The low voltage circuit region (LV) is formed between the first high voltage circuit region (HV1) and the second high voltage circuit region (HV2). In the low voltage circuit area (LV), a first alternator control circuit (11) which is often constituted by an electronic circuit is arranged. The low-voltage circuit region (LV) is provided with a plurality of switching power supplies (S) that supply power separately to the plurality of drive circuits (D) for the first AC machine (M1). For this reason, it is possible to transmit a control signal and supply power with an appropriate wiring length to both the first high-voltage circuit region (HV1) and the second high-voltage circuit region (HV2). The downsizing of (10) can be realized.

  In addition, the upper switching element (E1) of the inverter (5A) has a potential different depending on the switching state of the switching element (E) on both the positive electrode (P) side and the neutral point side, so it is necessary to maintain a floating relationship with each other. However, the lower switching element (E2) has the same potential on the negative electrode (N) side. Therefore, in the second high voltage circuit region (HV2), the insulation distance between the drive circuits (D) can be made shorter than the insulation distance in the first high voltage circuit region (HV1). That is, the second high-voltage circuit region (HV2) has a larger mounting area than the first high-voltage circuit region (HV1). The second AC machine control circuit (12) is arranged in the second high voltage circuit region (HV2), but the second high voltage circuit region (HV2) has a margin, so the scale of the inverter control board (10) is large. Expansion is suppressed. As described above, the power supply control circuit (15) that controls the switching power supply (S) that supplies power to the second AC machine control circuit (12) includes the first high-voltage circuit region (HV1) and the second high-voltage circuit region (HV2). ) And disposed in the low voltage circuit area (LV). Therefore, the second AC machine control circuit (12) can be supplied with an appropriate wiring length, and the inverter control board (10) can be reduced in size.

  Thus, according to the present embodiment, the inverter control board is configured by appropriately arranging a low voltage circuit such as a relatively low voltage control device and a high voltage circuit such as a relatively high voltage drive circuit. Further downsizing of (10) can be realized.

[Other Embodiments]
Hereinafter, other embodiments will be described. Note that the configuration of each embodiment described below is not limited to being applied independently, and can be applied in combination with the configuration of other embodiments as long as no contradiction arises.

(1) In the above, as shown in FIG. 8, one of the first wiring pattern WP1 and the second wiring pattern WP2 is formed so as to surround at least a part of the other wiring pattern. Was illustrated. However, as shown in FIG. 12, the first wiring pattern WP1 and the second wiring pattern WP2 may be arranged alternately. Also in this embodiment, it is possible to perform wiring so that the first wiring pattern WP1 and the second wiring pattern WP2 do not intersect.

(2) In the above, the inverter control board 10 that controls the rotating electrical machine used in the hybrid vehicle has been exemplified. However, the usage target of the inverter control board 10 is not limited to the hybrid vehicle, and may be an electric vehicle or a vehicle. It is not limited to. Moreover, the electrical equipment to be controlled by the inverter control board 10 is not limited to an AC rotating electrical machine, and the inverter control board 10 can be applied to various devices that control two AC machines.

(3) Note that the configurations disclosed in the above-described embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises. Regarding other configurations, the embodiments disclosed herein are merely examples in all respects. Accordingly, various modifications can be made as appropriate without departing from the spirit of the present disclosure.

[Outline of Embodiment]
The outline of the inverter control board (10) described above will be briefly described below.

As one aspect, an inverter (5A) that is provided between a first AC machine (M1) that is an AC electrical device (M) and a high-voltage DC power supply (3) and that converts power between DC and AC. The inverter control board (10) for controlling
A low-voltage circuit region (LV) having a negative electrode (G) of a low-voltage DC power supply (6) having a lower voltage than the high-voltage DC power supply (3) as a reference potential;
A high voltage circuit area (HV) including a circuit area having a negative potential (N) of the high voltage DC power supply (3) as a reference potential, and insulated from the low voltage circuit area (LV);
A plurality of drive circuits (D) for applying a driving force to each switching control signal for controlling each of the plurality of switching elements (E) of the inverter (5A), and the high-voltage DC power source (3) A second alternator control circuit (12) for controlling a second alternator (M2) different from the first alternator (M1), which is an AC electrical device (M) that operates using a power source as a driving force source, In the high voltage circuit area (HV),
A power control circuit (15) for controlling a plurality of switching power supplies (S) for supplying power to each of the drive circuits (D) and the second AC machine control circuit (12); and the switching control signal A first alternator control circuit (11) that generates and outputs a low voltage circuit area (LV),
The high voltage circuit region (HV) includes a first high voltage circuit region (HV1) in which the drive circuit (D (D1 to D3)) corresponding to the upper switching element (E1) of the inverter (5A) is disposed. The drive circuit (D (D4 to D6)) corresponding to the lower switching element (E2) of the inverter (5A) is divided and formed into a second high voltage circuit region (HV2),
The low voltage circuit area (LV) is formed between the first high voltage circuit area (HV1) and the second high voltage circuit area (HV2),
The second AC machine control circuit (12) is disposed in the second high voltage circuit region (HV2).

  According to this configuration, the inverter control board (10) includes the high voltage circuit region (HV) having the negative electrode (N) of the high voltage DC power supply (3) as a reference potential and the negative electrode (G) of the low voltage DC power supply (6). Since the low-voltage circuit region (LV) serving as the reference potential is included, a plurality of circuit devices in a floating relationship can be appropriately disposed. In the high voltage circuit area (HV), a drive circuit (D) for driving the first AC machine (M1), a second AC machine control circuit (12) for controlling the second AC machine (M2), Is placed. A circuit device such as the second alternator control circuit (12) is often constituted by an electronic circuit and is generally arranged in a low-voltage circuit area (LV). However, by arranging the second AC machine control circuit (12) in the high voltage circuit region (HV), the second AC machine control circuit (12) can be electrically connected to the same circuit range without using an insulating circuit. The second alternator (M2) can be controlled within. That is, the inverter control board (10) can be reduced in size because an insulating circuit or the like is not required.

  In addition, the upper switching element (E1) of the inverter (5A) has a potential different depending on the switching state of the switching element (E) on both the positive electrode (P) side and the neutral point side, so it is necessary to maintain a floating relationship with each other. However, the lower switching element (E2) has the same potential on the negative electrode (N) side. Therefore, in the second high voltage circuit region (HV2), the insulation distance between the drive circuits (D) can be made shorter than the insulation distance in the first high voltage circuit region (HV1). That is, the second high-voltage circuit region (HV2) has a larger mounting area than the first high-voltage circuit region (HV1). The second AC machine control circuit (12) is arranged in the second high voltage circuit region (HV2), but the second high voltage circuit region (HV2) has a margin, so the scale of the inverter control board (10) is large. Expansion is suppressed.

  Thus, according to this configuration, a low-voltage circuit such as a control device having a relatively low voltage and a high-voltage circuit such as a drive circuit having a relatively high voltage are appropriately arranged, and an inverter control board ( 10) can be further downsized.

Moreover, as one aspect, the inverter control board (10)
A plurality of insulated signal transmission elements (4) for transmitting signals including the switching control signals in an electrically insulated state are provided corresponding to the respective drive circuits (D),
The switching power source (S) is a transformer type switching power source in which an insulating transformer (T) is disposed across the high-voltage circuit region (HV) and the low-voltage circuit region (LV).
The first high voltage circuit area (HV1) and the second high voltage circuit area (HV2) include a plurality of first arrangement areas (LA1) in which the drive circuits (D) are arranged, respectively.
The second high voltage circuit area (HV2) includes a second arrangement area (LA2) in which the second AC machine control circuit (12) is arranged,
The insulating transformer (T) corresponding to each of the drive circuits (D) and the drive circuit (D) corresponding to each of the drive circuits (D) across the low voltage circuit region (LV) and the first arrangement region (LA1). The insulated signal transmission element (4) is disposed;
The insulating transformer (T) corresponding to the second AC machine control circuit (12) is disposed across the low-voltage circuit region (LV) and the second arrangement region (LA2),
Furthermore, a first wiring pattern (WP1) which is a wiring pattern for connecting the first AC machine control circuit (11) and each of the insulated signal transmission elements (4),
A second wiring pattern (WP2) that is a wiring pattern for connecting the power supply control circuit (15) and each of the insulation transformers (T),
Preferably, the first wiring pattern (WP1) and the second wiring pattern (WP2) are formed so that one wiring pattern surrounds at least a part of the other wiring pattern without intersecting each other. It is.

  The first wiring pattern (WP1) is a wiring pattern that is transmitted from the first alternator control circuit (11) and that is transmitted with a switching control signal having a relatively small signal voltage amplitude and a small signal current value. is there. On the other hand, since the second wiring pattern (WP2) is connected to the switching power supply (S), the second wiring pattern (WP2) is a wiring pattern through which a signal having a relatively large voltage amplitude and a large current value is transmitted. Therefore, when the first wiring pattern (WP1) and the second wiring pattern (WP2) are close to each other, a signal transmitted through the first wiring pattern (WP1) is likely to receive noise. A signal passing through the first wiring pattern (WP1) does not have high noise resistance. Therefore, it is preferable that the first wiring pattern (WP1) and the second wiring pattern (WP2) do not intersect with each other and are formed so as not to be close to each other. If one of the first wiring pattern (WP1) and the second wiring pattern (WP2) is formed so as to surround at least a part of the other wiring pattern, the two wiring patterns are appropriately separated from each other. This is preferable.

  Here, as one aspect, it is preferable that the first wiring pattern (WP1) and the second wiring pattern (WP2) are U-shaped with the opening directions facing each other. According to this configuration, since the bottom portions of the U-shape are largely separated from each other, the two wiring patterns can be appropriately separated without crossing each other. Further, by arranging the first alternator control circuit (11) and the power supply control circuit (15) in the vicinity of the bottom portion, the control circuit can be arranged at an approximately equivalent position with respect to the U-shaped arm portions. it can.

  As one aspect, it is preferable that the second wiring pattern (WP2) is formed so as to surround at least a part of the first wiring pattern (WP1). As described above, the signal passing through the second wiring pattern (WP2) has a larger voltage amplitude and a larger current value than the signal passing through the first wiring pattern (WP1). Since the low voltage circuit region (LV) is sandwiched between the high voltage circuit region (HV), if the second wiring pattern (WP2) is arranged outside the first wiring pattern (WP1), the high voltage circuit region (HV) ) Side. The high voltage circuit region (HV) has a high voltage and many signals with a large current value, and therefore is more likely to be a noise generation source than the low voltage circuit region (LV). According to this configuration, the second wiring pattern (WP2) that transmits a signal having a large voltage amplitude, a large current value, and high noise resistance is arranged on the high voltage circuit region (HV) side. Thereby, the influence of noise on the signal transmitted through the wiring pattern (WP1) having relatively low noise resistance can be reduced.

3: High voltage battery (high voltage DC power supply)
4: Isolation element 5A: First inverter (inverter between the first AC machine and the high-voltage DC power supply)
6: Low voltage battery (low voltage DC power supply)
10: Inverter control board 11: First inverter control circuit (first AC machine control circuit)
12: Second inverter control circuit (second AC machine control circuit)
15: Power supply control circuit C: Smoothing capacitor D: Drive circuit E: Switching element E1: Upper stage side switching element E2: Lower stage side switching element G: Low voltage power supply negative electrode (negative electrode of low voltage DC power supply)
HV: High voltage circuit area HV1: First high voltage circuit area HV2: Second high voltage circuit area IR: Insulation area LA1: First arrangement area LA2: Second arrangement area LV: Low voltage circuit area M1: First rotating electrical machine (first AC Machine)
M2: Second rotating electrical machine (second AC machine)
N: High voltage power source negative electrode (high voltage DC power source negative electrode)
S: Switching power supply T: Transformer (insulation transformer)
WP1: First wiring pattern WP2: Second wiring pattern

Claims (4)

An inverter control board that is provided between a first AC machine that is an AC electrical device and a high-voltage DC power source and controls an inverter that converts power between DC and AC,
A low-voltage circuit area having a reference potential as a negative electrode of a low-voltage DC power supply having a lower voltage than the high-voltage DC power supply;
Including a circuit region having a negative potential of the high-voltage DC power supply as a reference potential, and having a high-voltage circuit region insulated from the low-voltage circuit region,
A plurality of drive circuits for separately applying a driving force to each switching control signal for controlling each of the plurality of switching elements of the inverter;
A second AC machine control circuit for controlling a second AC machine different from the first AC machine, which is an AC electrical device that operates using the high-voltage DC power source as a driving force source;
In the high-voltage circuit region,
A power supply control circuit for controlling a plurality of switching power supplies that respectively supply power to each of the drive circuits and the second AC machine control circuit;
A first alternator control circuit for generating and outputting the switching control signal;
In the low-pressure circuit area,
The high voltage circuit region includes a first high voltage circuit region in which the drive circuit corresponding to the upper switching element of the inverter is disposed, and a second high voltage circuit in which the drive circuit corresponding to the lower switching element of the inverter is disposed. Divided into circuit areas,
The low-voltage circuit region is formed between the first high-voltage circuit region and the second high-voltage circuit region,
The second AC machine control circuit is disposed in the second high-voltage circuit region.
Inverter control board. A plurality of insulated signal transmission elements that transmit signals including the switching control signal in an electrically insulated state are provided corresponding to the respective drive circuits,
The switching power supply is a transformer type switching power supply in which an insulating transformer is disposed across the high-voltage circuit region and the low-voltage circuit region.
The first high voltage circuit area and the second high voltage circuit area include a plurality of first arrangement areas in which the drive circuits are arranged,
The second high-voltage circuit area includes a second arrangement area in which the second alternator control circuit is arranged,
The insulation transformer corresponding to each drive circuit and the insulation type signal transmission element corresponding to the drive circuit are arranged across the low-voltage circuit region and the first arrangement region,
The insulating transformer corresponding to the second AC machine control circuit is disposed across the low-voltage circuit region and the second arrangement region,
Furthermore, a first wiring pattern that is a wiring pattern for connecting the first AC machine control circuit and each of the insulated signal transmission elements,
A second wiring pattern that is a wiring pattern for connecting the power supply control circuit and each of the insulating transformers,
The first wiring pattern and the second wiring pattern are formed so that one wiring pattern surrounds at least a part of the other wiring pattern without crossing each other.
The inverter control board according to claim 1.   3. The inverter control board according to claim 2, wherein the first wiring pattern and the second wiring pattern are U-shaped with the opening directions facing each other. The inverter control board according to claim 2, wherein the second wiring pattern is formed so as to surround at least a part of the first wiring pattern.

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