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KR-20260066393-A - APPARATUS AND METHOD FOR CONTROLLING INVERTER OF VEHICLE

KR20260066393AKR 20260066393 AKR20260066393 AKR 20260066393AKR-20260066393-A

Abstract

The present invention relates to a vehicle inverter control device and a method thereof, comprising an oscillator that controls the isolation communication of the inverter, an over-oscillation monitoring unit that detects frequency over-oscillation of the inverter based on the voltage of the oscillator, and a processor that, when an over-oscillation detection signal is input from the over-oscillation monitoring unit, stops the operation of the oscillator, waits until the voltage of the oscillator is discharged, and then resets the oscillator to control it to operate again. This allows the circuit to be restarted through the reset of the oscillator even if over-oscillation occurs, and enables stable frequency control to be performed to stabilize the output of the inverter.

Inventors

  • 조원희

Assignees

  • 현대모비스 주식회사

Dates

Publication Date
20260512
Application Date
20241104

Claims (10)

  1. An oscillator that controls the isolated communication of an inverter; An over-oscillation monitoring unit that detects frequency over-oscillation of the inverter based on the voltage of the oscillator; and A vehicle inverter control device comprising: a processor that, when an over-oscillation detection signal is input from the over-oscillation monitoring unit, stops the operation of the oscillator, waits until the voltage of the oscillator is discharged, and then resets the oscillator to control it to operate again.
  2. In Article 1, A vehicle inverter control device characterized by the processor initializing the count of the soft start control signal of the over-oscillation monitoring unit to the maximum value when the over-oscillation detection signal is input, thereby delaying the operation of the over-oscillation monitoring unit.
  3. In Article 1, A vehicle inverter control device characterized in that the above-described over-oscillation monitoring unit includes a transistor that operates by the above-described over-oscillation detection signal to discharge the voltage of the oscillator.
  4. In Article 1, A vehicle inverter control device characterized by the above processor applying a discharge signal to a transistor provided in the above over-oscillation monitoring unit when the above over-oscillation detection signal is input, thereby discharging the voltage of the oscillator by the transistor.
  5. In Article 1, A vehicle inverter control device characterized by the above-described over-oscillation monitoring unit comparing the voltage of the oscillator with a reference voltage and inputting the over-oscillation detection signal to the processor when the voltage of the oscillator is greater than the reference voltage.
  6. A step in which an over-oscillation monitoring unit receives the voltage of an oscillator controlling the isolation communication of an inverter and detects frequency over-oscillation of the inverter based on the voltage of the oscillator; A step in which, when the processor receives an over-oscillation detection signal from the over-oscillation monitoring unit, it stops the operation of the oscillator and waits until the voltage of the oscillator is discharged; and A method for controlling a vehicle inverter comprising the step of the processor resetting the oscillator to operate again.
  7. In Article 6, In the step of detecting frequency over-oscillation of the above inverter, A vehicle inverter control method characterized by the above-described over-oscillation monitoring unit comparing the voltage of the oscillator with a reference voltage, and inputting the over-oscillation detection signal to the processor when the voltage of the oscillator is greater than the reference voltage.
  8. In Article 6, The above waiting step is, A vehicle inverter control method comprising: a step in which a transistor included in the over-oscillation monitoring unit operates in response to the over-oscillation detection signal to discharge the voltage of the oscillator.
  9. In Article 6, The above waiting step is, A step of applying a discharge signal to a transistor provided in the over-oscillation monitoring unit when the over-oscillation detection signal is input to the processor; and A method for controlling a vehicle inverter comprising the step of the transistor discharging the voltage of the oscillator.
  10. In Article 6, The above waiting step is, A vehicle inverter control method comprising: a step in which, when the over-oscillation detection signal is input, the processor initializes the count of the soft start control signal of the over-oscillation monitoring unit to a maximum value to delay the operation of the over-oscillation monitoring unit.

Description

Apparatus and Method for Controlling Inverter of Vehicle The present invention relates to a vehicle inverter control device and a method thereof for controlling an inverter that provides power to drive a motor of a vehicle. An electric vehicle includes an inverter that provides operating power to the motor. The inverter includes a gate driver IC (integrated circuit) to interface the high-voltage section and the low-voltage section. The gate driver IC provides electrical isolation to prevent high-voltage electricity from penetrating the low-voltage section, and enables the microcontroller in the low-voltage section to control the power components in the high-voltage section. Gate driver ICs are electrically isolated from their low-voltage and high-voltage sections, and methods such as OOK (on/off keying) can be used for isolated communication. Such isolated communication requires a high-frequency oscillator, and ring oscillators are generally used. However, ring oscillators have a problem in that it is difficult to guarantee a consistent frequency value because the oscillation frequency varies significantly depending on temperature, voltage, and manufacturing process tolerances. Furthermore, the inverter has two stabilization points; however, if the limit operating frequency is exceeded, it becomes unable to handle high frequencies, leading to a problem where the switching elements operate abnormally. In such abnormal operation, isolated communication also fails to be performed. A related technology is Korean Registered Patent Publication No. 10-1048962, 'Output voltage stabilization circuit for high-voltage inverter'. FIG. 1 is a diagram briefly illustrating the control configuration of an inverter according to one embodiment of the present invention. FIG. 2 is a figure showing an output waveform according to inverter operation according to one embodiment of the present invention. FIG. 3 is a block diagram briefly illustrating the control configuration of an inverter control device according to one embodiment of the present invention. FIG. 4 is a diagram showing the circuit configuration of an inverter control device according to one embodiment of the present invention. Figure 5 is a figure showing an operation signal according to the circuit configuration of Figure 4. FIG. 6 is a flowchart illustrating an over-oscillation control method of an inverter control device according to one embodiment of the invention. FIG. 7 is a figure illustrating another example of the circuit configuration of an inverter control device according to one embodiment of the invention. The present invention will be described below with reference to the attached drawings. In this process, the thickness of lines or the size of components depicted in the drawings may be exaggerated for the sake of clarity and convenience of explanation. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intent or convention of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification. FIG. 1 is a diagram briefly illustrating the control configuration of an inverter according to one embodiment of the present invention. Referring to FIG. 1, the inverter (150) is connected to the controller (10) and the motor (160) and operates according to the control signal of the controller (10) to supply operating power to the motor (160). The inverter (150) may include a gate driver IC (151) and a power element (152). The gate driver (IC) may be composed of a low voltage section (A) of 12V and a high voltage section (B) of 100V or more. A plurality of power elements (152) are connected to the high voltage section (B) to allow a signal to be applied to the motor (160). The inverter (150) can apply U-phase, V-phase, and W-phase power to the motor (160) as the gate driver (IC) and power element (152) operate in response to the control signal of the controller (10). At this time, the gate driver IC (151) can electrically isolate the low voltage section (A) and the high voltage section (B) so that high voltage electricity cannot penetrate the low voltage section (A). Meanwhile, the gate driver IC (151) can perform isolated communication for communication between the low voltage section (A) and the high voltage section (B). The gate driver IC (151) can perform isolated communication using a ring oscillator. The ring oscillator can operate in a Frequency Locked Loop (FLL) manner. FIG. 2 is a figure showing an output waveform according to inverter operation according to one embodiment of the present invention. As illustrated in FIG. 2(a), the inverter (150) performs a rail-to-rail swing operation during normal operation. The output (VOUT) of the inverter (150) forms a pulse signal in which a high signal and a low signal are repeatedly output at regular time intervals. Accordingly, the output (VOUT) of the inverter (150