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JP-2026074578-A - AC voltage output devices, AC voltage output systems, and vehicles

JP2026074578AJP 2026074578 AJP2026074578 AJP 2026074578AJP-2026074578-A

Abstract

[Problem] To provide an in-vehicle AC voltage output device, AC voltage output system, and vehicle capable of supporting idle stop. [Solution] The lithium battery 4 is installed under the floor of the vehicle, and the remainder is housed in a junction box as an AC voltage output device. The AC voltage output system 100, which is installed in an appropriate location inside the vehicle such as near the driver's seat, includes an inverter 1 that can receive a DC voltage from an auxiliary battery 21, which is an on-board battery, via an auxiliary battery relay 11, and a DC voltage from a lithium battery 4, which is a secondary battery, via a lithium battery relay 13, and generates and outputs an AC voltage from the input DC voltage; a lithium charger 3 that charges the lithium battery with the AC voltage from the inverter via a charger relay 12; and an AC voltage output unit 2 that outputs the AC voltage from the inverter. [Selection Diagram] Figure 1

Inventors

  • 山川 達也

Assignees

  • ＧＬＭ株式会社
  • ダブルクラッチ株式会社

Dates

Publication Date
20260507
Application Date
20241021

Claims (13)

  1. An inverter that can receive a DC voltage from an onboard battery via a first switch, and a DC voltage from a secondary battery via a second switch, and generates and outputs an AC voltage from the input DC voltage, A charger that charges the secondary battery with the AC voltage from the inverter via a third switch, An AC voltage output device comprising an AC voltage output unit that outputs an AC voltage from the inverter.
  2. The AC voltage output device according to claim 1, further comprising a control unit for controlling the on/off states of the first switch, the second switch, and the third switch.
  3. The control unit controls the on/off states of the first switch, the second switch, and the third switch based on the DC voltage from the vehicle battery, as described in claim 2 of the AC voltage output device.
  4. The control unit controls the on/off states of the first switch and the second switch so that the output of the AC voltage from the AC voltage output unit is not interrupted, as described in claim 2 or 3 of the AC voltage output device.
  5. The control unit, If the DC voltage from the vehicle battery exceeds a first threshold, the first switch is turned on, the second switch is turned off, and the third switch is turned on. The AC voltage output device according to claim 2 or 3, wherein if the DC voltage from the vehicle battery does not exceed a first threshold, the first switch is turned off, the second switch is turned on, and the third switch is turned off.
  6. The control unit, when the vehicle on which the AC voltage output device is installed is stopped, turns off the first switch, turns on the second switch, and turns off the third switch, according to claim 2 or 3 of the AC voltage output device.
  7. The AC voltage output device according to claim 2, wherein the control unit controls the on/off state of the first switch, the second switch, and the third switch based on the DC voltage from the on-board battery and the DC voltage from the secondary battery.
  8. The AC voltage output device according to claim 7, wherein, when the DC voltage from the on-board battery transitions from a state exceeding a first threshold to a state not exceeding a first threshold, the control unit first turns the second switch from off to on, and then, after a delay time corresponding to the difference between the DC voltage from the secondary battery and the DC voltage from the on-board battery, turns the first switch from on to off.
  9. The AC voltage output device according to claim 8, wherein the larger the voltage difference Dv in the following equation, the shorter the delay time: Dv = DC voltage from the secondary battery - DC voltage from the onboard battery.
  10. The AC voltage output device according to claim 8 or 9, wherein the delay time is set so that when the voltage output by the vehicle battery transitions from a state exceeding a first threshold to a state not exceeding the first threshold, the DC voltage input to the inverter does not fall below a second threshold.
  11. The inverter will not output an AC voltage properly if the input DC voltage falls below the output cutoff voltage. The AC voltage output device according to claim 10, wherein the second threshold is equal to or higher than the output cutoff voltage.
  12. An AC voltage output system comprising the aforementioned secondary battery and an AC voltage output device according to any one of claims 1 to 3, 7 to 9.
  13. A vehicle comprising the aforementioned on-board battery and the AC voltage output system described in claim 12.

Description

This invention relates to an AC voltage output device, an AC voltage output system, and a vehicle. In recent years, awareness of environmental issues has increased, and for example, there is a growing demand for vehicle idle stop systems. Japanese Patent Publication No. 2022-091016 A block diagram showing the schematic configuration of the AC voltage output system 100 according to the first embodiment.This diagram illustrates the on/off control of relays 11-13 by the system controller 20.A diagram illustrating the operating state of the AC voltage output system in state 1.A diagram illustrating the operating state of the AC voltage output system in states 2-1 and 2-2.A schematic diagram showing an example of the switching timing for relays 11 and 13.A diagram illustrating the operating state of an AC voltage output system.A block diagram showing the schematic configuration of the AC voltage output system 100 according to the second embodiment.A diagram illustrating an example of the switching timing for relays 11 and 13.A diagram illustrating another example of the switching timing for relays 11 and 13.A diagram illustrating the relationship between voltage difference Dv and delay time Dt. The embodiments of the present invention will be described in detail below with reference to the drawings. (First Embodiment) Figure 1 is a block diagram showing the schematic configuration of the AC voltage output system 100 according to the first embodiment. The AC voltage output system 100 may include an inverter 1, an AC voltage output unit 2, a lithium charger 3, a lithium battery 4, an auxiliary battery relay 11, a charger relay 12, a lithium battery relay 13, a system controller 20, and the like. As a typical example, this AC voltage output system 100 is mounted in a vehicle. Specifically, the lithium battery 4 of the AC voltage output system 100 is installed under the vehicle floor, while the remainder is housed in a junction box as an AC voltage output device and can be installed in an appropriate location inside the vehicle, such as near the driver's seat. The AC voltage output system 100 is then connected to the vehicle's original auxiliary battery 21 and alternator 22. Here, the auxiliary battery 21 is charged by the alternator 22, and when sufficiently charged, it outputs a DC voltage of approximately 24V. The connections of each part are as follows: The positive terminal of the auxiliary battery 21 is connected to one end of the auxiliary battery relay 11. It can also be said that the alternator 22 is connected to one end of the auxiliary battery relay 11. The other end of the auxiliary battery relay 11 is connected to the input terminal of the inverter 1. The output terminal of the inverter 1 is connected to both the AC voltage output unit 2 and the input terminal of the lithium charger 3. The output terminal of the lithium charger 3 is connected to one end of the charger relay 12. The other end of the charger relay 12 is connected to the positive terminal of the lithium battery 4. The positive terminal of the lithium battery 4 is also connected to one end of the lithium battery relay 13. The other end of the lithium battery relay 13 is connected to the input terminal of the inverter 1. That is, the other end of the auxiliary battery relay 11 and the other end of the lithium battery relay 13 are connected to the input terminal of the inverter 1. The AC voltage output system 100 may also include a pre-charge relay 14 and a resistor R connected in series between the positive terminal of the lithium battery 4 and the input terminal of the inverter 1. The positive terminal of the auxiliary battery 21 is connected to the system controller 20. It can also be said that the alternator 22 is connected to the system controller 20. A signal that can be used to determine whether the vehicle is stopped or not (for example, a vehicle speed pulse signal) may also be input to the system controller 20. The system controller 20 controls the relays 11 to 14 on and off based on the DC voltage from the auxiliary battery 21 and whether the vehicle is stopped or not. Although not shown in the diagram, the DC voltage from the lithium battery 4 may be output externally and made available for use. The negative terminals of the lithium battery 4 and the auxiliary battery 21 are commonly grounded (not shown). Furthermore, in this specification, "A and B are connected" includes both cases where A and B are directly connected by conductive materials such as wiring, and cases where they are indirectly connected via some electrical component. The lithium battery 4 is an example of a secondary battery. The auxiliary battery 21 is an example of an on-board battery. Relays 11-14 are examples of switches. With the above connection configuration, the inverter 1 can receive a DC voltage from the auxiliary battery 21 (alternator 22) via the auxiliary battery relay 11, and a DC voltage (for example, 28V) from the lithium battery 4 via the lithium