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DE-102025117166-B3 - Motor vehicle with inverter

DE102025117166B3DE 102025117166 B3DE102025117166 B3DE 102025117166B3DE-102025117166-B3

Abstract

The invention relates to a motor vehicle with an inverter, comprising an electric machine, a high-voltage battery, and an inverter, wherein the high-voltage battery is connected to the inverter to supply the inverter with energy, and wherein the inverter is connected to the electric machine and the high-voltage battery and is configured to supply the electric machine and the high-voltage battery with energy, wherein the motor vehicle comprises a DC charging interface and an AC charging interface, wherein the AC charging interface is connected to the inverter, wherein the inverter is configured to operate at a first clock frequency in a driving mode, and wherein the inverter is further configured to operate at a second clock frequency in a charging mode, wherein the first clock frequency is higher than the second clock frequency.

Inventors

  • Lorenz Hartstang
  • Oliver Lehmann
  • Moritz Eitler

Assignees

  • DR. ING. H.C. F. PORSCHE AKTIENGESELLSCHAFT

Dates

Publication Date
20260513
Application Date
20250506

Claims (7)

  1. Motor vehicle (100) with inverter (140), comprising an electric machine (120), an HV battery (110) and an inverter (140), wherein the HV battery (110) is connected to the inverter (140) to supply the inverter (140) with energy, and wherein the inverter (140) is connected to the electric machine (120) and the HV battery (110) and is configured to supply the electric machine (120) and the HV battery (110) with energy, wherein the motor vehicle comprises a DC charging interface and an AC charging interface, wherein the AC charging interface is connected to the inverter (140), wherein the inverter (140) is configured to operate in a driving mode with a first clock frequency, and wherein the inverter is further configured to operate in a charging mode with a second clock frequency, wherein the first clock frequency is higher than the second clock frequency. the electric machine (120) and the HV battery (110) are arranged in a heating circuit, characterized in that the electric machine (120) comprises heating resistors and/or a heat pump for generating heat for the heating circuit, which are designed to generate heat when the motor vehicle is stationary and to transfer it to the heating circuit.
  2. Motor vehicle (100) with inverter (140) according to Claim 1 , characterized in that the heating circuit is designed to heat the HV battery (110) using waste heat from the electric machine (120).
  3. Motor vehicle (100) with inverter (140) according to one of the preceding claims, characterized in that the motor vehicle comprises a disconnect switch (130) which is designed to switch between a DC charging operation and an AC charging operation.
  4. Motor vehicle (100) with inverter (140) according to one of the preceding claims, characterized in that the inverter (140) is single-phase or three-phase.
  5. Motor vehicle (100) with inverter (140), according to one of the preceding claims, characterized in that the inverter comprises several driver stages in a bridge circuit and a control unit of the inverter is designed to allow the clock frequency to be switched between driving mode and charging mode via pulse width modulation for controlling the respective driver stage.
  6. Motor vehicle (100) with inverter (140) according to Claim 5 , characterized in that the inverter includes at least one variable gate resistor for controlling the respective driver stage, wherein the control unit is designed to adjust the respective variable gate resistor in such a way that the switching frequency of the respective driver stage can be switched between driving mode and charging mode.
  7. Motor vehicle (100) with inverter (140) according to one of the preceding claims, characterized in that the electric machine is designed as a brushless DC motor.

Description

The present invention relates to a motor vehicle with an inverter. Today's modern electric vehicles, which are already equipped with advanced battery systems and inverter technologies, offer the opportunity to expand and optimize these systems to enable bidirectional energy transfer. These systems are capable of drawing energy from the power grid and feeding energy back into the grid. This enables bidirectional energy transfer between the vehicle and the power grid. The bidirectional power transfer between the vehicle and the power grid requires the use of intelligent inverter technology to ensure safe and efficient power transmission. Specifically, intelligent inverter topologies capable of regulating and stabilizing power transfer are necessary to guarantee system safety and reliability. The use of intelligent inverter technology optimizes power transfer between the vehicle and the power grid, thereby increasing system efficiency. The JP 2020 - 058 178 A concerns a method for load control and a device for carrying out the method. The DE 10 2012 107 016 A1 concerns a method for operating a heater for a battery of a motor vehicle that is at least partially and/or temporarily electrically powered. The present invention relates to an innovative motor vehicle with an inverter, which solves the problems of the prior art. For this purpose, a motor vehicle with vehicle-to-network functionality according to claim 1 is provided according to the invention. Advantageous embodiments can be found in the dependent claims and the description. The invention relates to a motor vehicle with an inverter, comprising an electric machine, a high-voltage battery, and the inverter, wherein the high-voltage battery is connected to the inverter to supply the inverter with energy, and wherein the inverter is connected to the electric machine and the high-voltage battery and is configured to supply the electric machine and the high-voltage battery with energy, wherein the motor vehicle comprises a DC charging interface and an AC charging interface, wherein the AC charging interface is connected to the inverter, wherein the inverter is configured to operate at a first clock frequency in a driving mode, and wherein the inverter is further configured to operate at a second clock frequency in a charging mode, wherein the first clock frequency is higher than the second clock frequency. The term inverter can be used synonymously with the term converter or inverter. An inverter is designed to convert one AC voltage (via the AC charging interface), one DC voltage (via the DC charging interface), or one from the high-voltage battery into another AC or DC voltage. The DC charging interface and the AC charging interface can be powered via an external infrastructure. This can lead to crosstalk of high-frequency line currents from the inverter, which can result in increased EMC emissions. To counteract this problem, the clock frequency and switching frequency of the inverter can be reduced in charging mode to comply with legally mandated limits. According to the invention, the electric machine and the high-voltage battery are arranged in a heating circuit. The electric machine can be configured to enable temperature control of the high-voltage battery. This can be advantageous for maintaining the charge and power of the high-voltage battery at low ambient temperatures. According to the invention, the electric machine is designed to generate heat for the heating circuit and comprises at least one heating resistor and/or a heat pump, which are designed to generate heat when the motor vehicle is stationary and to transfer it to the heating circuit. Alternatively or additionally, the electric machine can be designed to be cooled via the heating circuit. For this purpose, heat generated during operation of the electric machine can be extracted via the heating circuit. In an advantageous further development, the heating circuit is designed as a glycol section. In an advantageous further development, the heat pump is designed as a split device, which allows heating or cooling of the heating circuit. In a further training course, the heating circuit is designed to heat the HV battery using waste heat from the electric machine. In a further training, the motor vehicle includes a disconnect switch which is designed to switch between a DC charging operation and an AC charging operation. The disconnect switch can be designed to galvanically isolate the AC charging interface from the inverter. In a further training exercise, the inverter switches with a first switching frequency in driving mode and with a second switching frequency in charging mode, whereby the first switching frequency is higher than the second switching frequency. In a further training course, the inverter is trained as either single-phase or three-phase. In a further training, the inverter comprises several driver stages in a bridge circuit and a control unit of the inverter is designed to