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JP-2026074629-A - Inverter device

JP2026074629AJP 2026074629 AJP2026074629 AJP 2026074629AJP-2026074629-A

Abstract

[Problem] To provide an inverter device that can more effectively reduce the impact of noise from switching elements on the drive circuit. [Solution] The control board 38 on which the drive circuit is mounted is configured as a multilayer board. A control board module including the control board 38 and a main circuit module including a main circuit on which switching elements are mounted are integrated in the stacking direction of the multilayer board. A high-voltage circuit GND pattern 40 and a low-voltage circuit GND pattern 42 are provided separately on the same layer of the control board 38. In the control board 38, a low-voltage circuit GND layer 44 having a low-voltage circuit GND that is electrically connected to the low-voltage circuit GND pattern 40 is provided in a layer located between the layer on which the high-voltage circuit GND pattern 40 and the low-voltage circuit GND pattern 42 are arranged and the main circuit module. [Selection Diagram] Figure 3

Inventors

  • 秋山 清和
  • 岩崎 真悟

Assignees

  • 株式会社SOKEN
  • 株式会社デンソー

Dates

Publication Date
20260507
Application Date
20241021

Claims (7)

  1. A main circuit module (23) including a main circuit (22) on which switching elements (16UH, 16UL, 18VH, 18VL, 20WH, 20WL) constituting the inverter are mounted, The control board module (39) includes a control board (38) on which drive circuits (24, 26, 28, 30, 32) that output drive signals for driving the switching elements are mounted, The control board is a multilayer board, The main circuit module and the control board module are integrated in the stacking direction of the multilayer substrate. On the same layer of the control board, a high-voltage circuit GND pattern (40) for the high-voltage circuit in the drive circuit and a low-voltage circuit GND pattern (42) for the low-voltage circuit in the drive circuit are provided separately. An inverter device in which, in a layer separate from the layer on which the high-voltage circuit GND pattern and the low-voltage circuit GND pattern are arranged, and located between the layer on which the high-voltage circuit GND pattern and the low-voltage circuit GND pattern are arranged and the main circuit module, at least one of a low-voltage circuit GND layer (44, 44A, 44B) having a low-voltage circuit GND that is conductive to the low-voltage circuit GND pattern and a high-voltage circuit GND layer (46) having a high-voltage circuit GND that is conductive to the high-voltage circuit GND pattern is provided.
  2. The inverter device according to claim 1, wherein the low-voltage circuit GND of the low-voltage circuit GND layer and/or the high-voltage circuit GND of the high-voltage circuit GND layer have a shape that closes the gap between the high-voltage circuit GND pattern and the low-voltage circuit GND pattern in the stacking direction of the multilayer substrate.
  3. The inverter device according to claim 1 or 2, wherein the low-voltage circuit GND of the low-voltage circuit GND layer is arranged to face the high-voltage circuit GND pattern via an insulating layer of the multilayer substrate, or the high-voltage circuit GND of the high-voltage circuit GND layer is arranged to face the low-voltage circuit GND pattern via an insulating layer of the multilayer substrate.
  4. The inverter device according to claim 3, wherein the low-voltage circuit GND layer and the high-voltage circuit GND layer are provided on different layers of the multilayer substrate, respectively.
  5. The inverter device according to claim 4, wherein, when at least one of the low-voltage circuit GND layer and the high-voltage circuit GND layer is provided in multiple layers, the low-voltage circuit GND layer and the high-voltage circuit GND layer are provided alternately.
  6. The inverter device according to claim 1 or 2, wherein a control circuit (36) for controlling the drive circuit is mounted on the control board.
  7. The high-voltage circuit GND pattern and the low-voltage circuit GND pattern are provided on the surface layer of the multilayer substrate on the side opposite to the side in which the main circuit module is integrated. The inverter device according to claim 6, wherein the drive IC incorporating the drive circuit and the control IC incorporating the control circuit are mounted on the surface layer of the multilayer substrate.

Description

This disclosure relates to an inverter device in which a main circuit module, which includes a main circuit on which switching elements constituting the inverter are mounted, and a control board module, which includes a control board on which a drive circuit for outputting drive signals for driving the switching elements are mounted, are integrated. For example, Patent Document 1 describes an inverter-integrated electric compressor. This inverter-integrated electric compressor has an inverter housing section on the outer circumference of the housing that accommodates the inverter device. The inverter device comprises a power circuit board on which semiconductor switching elements and the like are mounted, and a control board on which control and communication circuits that operate at low voltage are mounted. A high-voltage busbar is arranged in the space above the power circuit board and the control board to connect high-voltage lines with high-voltage components such as smoothing capacitors, inductor coils, and common-mode coils. Furthermore, to reduce electromagnetic noise interference from the high-voltage busbar, a shielding plate is placed between the high-voltage busbar and the inverter module. Japanese Patent Publication No. 2009-127523 This is a configuration diagram showing an example of the configuration of an inverter device according to the embodiment.This diagram shows an example of a configuration where the main circuit module and the control board module are integrated.This diagram shows a detailed view of a part of the control board module.This figure shows examples of high-voltage circuit GND patterns and low-voltage circuit GND patterns.This figure shows an example of a low-voltage circuit GND in a low-voltage circuit GND layer.This graph shows the maximum measured magnetic field values for both the example and the comparative example.This graph shows the maximum measured electric field values for both the example and the comparative example.This diagram shows a detailed view of a part of the control board module, based on a modified example. The following describes preferred embodiments of this disclosure with reference to the drawings. Note that identical or similar configurations may be omitted from the description by assigning the same reference numeral across multiple drawings. If only a portion of a configuration is described in each embodiment, the configuration of other embodiments described earlier may be applied to the remaining parts of that configuration. Furthermore, in addition to the combinations of configurations explicitly stated in the description of each embodiment, configurations from multiple embodiments may be partially combined, even if not explicitly stated, as long as there are no particular problems with the combination. (First Embodiment) The inverter device according to this embodiment can be used, for example, to drive an electric motor as a power source for a mobile body. Examples of mobile bodies include electric vehicles such as battery electric vehicles (BEVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs), electric aircraft such as drones and electric vertical take-off and landing aircraft (eVTOLs), ships, construction machinery, and agricultural machinery. However, the electric motor to be driven by the inverter device according to this embodiment is not limited to an electric motor as a power source for a mobile body; for example, it could be an electric motor that drives a compressor in an air conditioning system. Thus, the inverter device according to this embodiment can be applied to electric motors that require a large current to obtain high output. In Figure 1, the electric motor 50 is, for example, a three-phase AC rotating electric machine. Figure 1 shows an example where the U-phase coil, V-phase coil, and W-phase coil are connected in a Y configuration. The U-phase coil, V-phase coil, and W-phase coil may also be connected in a delta configuration. The electric motor 50 functions, for example, as a vehicle's driving source, i.e., an electric motor. In this case, the electric motor 50 generates torque to drive drive wheels (not shown). Furthermore, the electric motor 50 may also function as a generator that generates regenerative power during vehicle braking. Figure 1 shows an example of the configuration of the inverter device 10 according to this embodiment. The inverter device 10 shown in Figure 1 includes a high-voltage battery 12, a smoothing capacitor 14, a main circuit 22 on which switching elements 16UH, 16UL, 18VH, 18VL, 20WH, and 20WL constituting the inverter are mounted, and a control board 38 on which drive circuits 24, 26, 28, 30, 32, and 34 are mounted to output gate drive signals for driving the switching elements 16UH, 16UL, 18VH, 18VL, 20WH, and 20WL. As a power conversion circuit, the inverter device 10 converts the DC power supplied from the high-voltage battery 12 into AC power and outputs it t