DE-102025120641-A1 - Inverter device with integrated double-sided OBC function and control method

DE102025120641A1DE 102025120641 A1DE102025120641 A1DE 102025120641A1DE-102025120641-A1

Abstract

An inverter device incorporating a two-way OBC function includes a main string unit containing N strings connected between a DC terminal connected to a battery and an AC terminal connected to a motor, and comprising a pair of high-side switches and a pair of low-side switches; an auxiliary string unit connected or disconnected between a common positive terminal and a common negative terminal of the main string unit, and comprising the pair of high-side switches and the pair of low-side switches; an auxiliary switch connecting the auxiliary string unit or DC to the main string unit according to a motor drive/V2L operating mode (AC load connection), a slow charge mode (AC power connection), or a fast charge mode (DC power connection); and a connection unit for selectively connecting one of the AC load, AC power, and DC power to a neutral node of the motor.

Inventors

Tae Yeong LEE
Sung Yong Park
Sung Kyu Kim
Jong Kyong Lim

Assignees

HYUNDAI MOTOR COMPANY
KIA CORPORATION

Dates

Publication Date: 20260513
Application Date: 20250527
Priority Date: 20241108

Claims (20)

Inverter device with integrated two-way OBC function, comprising: an integrated inverter comprising: a main string unit with N strings connected between a DC terminal connected to a battery and an AC terminal connected to each of the three-phase inductors of a motor, the main string unit comprising a pair of high-side switches and a pair of low-side switches, each connected to the DC terminal; an auxiliary string unit connected or disconnected between a common positive terminal and a common negative terminal of the main string unit, the auxiliary string unit comprising the pair of high-side switches and the pair of low-side switches; an auxiliary switch connecting the auxiliary string unit or the DC supply to the main string unit according to a motor drive/V2L operating mode, a slow charge mode, or a fast charge mode; and a connection unit configured to connect either an AC load, AC or DC to a neutral node of the motor.
Inverter device with integrated two-way OBC function according to Claim 1 , further comprising: an AC filter which is connected between an output terminal of the connecting unit and the auxiliary string unit, as well as between the connecting unit and the auxiliary switch.
Inverter device with integrated two-way OBC function according to Claim 2 , furthermore comprehensive: a controller configured to control the auxiliary switch, main string unit, auxiliary string unit and connection unit of the integrated inverter according to the motor drive/V2L operating mode, slow charge mode or fast charge mode.
Inverter device with integrated two-way OBC function according to Claim 3 , wherein the control system comprises: a first control system configured to generate a main-train control signal configured to control one of the high-side switches and one of the low-side switches of the main-train unit, and to generate an auxiliary-train control signal to control one of the high-side switches and one of the low-side switches of the auxiliary-train unit according to the motor drive/V2L operating mode, the slow charge mode, or the fast charge mode; and a second control system configured to generate a first switching control signal to control the auxiliary switch of the integrated inverter and a second switching control signal to control the linkage unit according to the motor drive/V2L operating mode. riebs/V2L function mode, slow charge mode or fast charge mode.
Inverter device with integrated two-way OBC function according to Claim 4 , wherein the first control unit includes: a first motor drive/V2L function mode control configured to generate a main train control signal based on a torque command value to drive a motor and outputs the main train control signal to the main train unit in the motor drive/V2L function mode; and a second motor drive/V2L function mode control configured to generate an auxiliary train control signal based on a voltage command value to perform a V2L function and outputs the auxiliary train control signal to the auxiliary train unit in the motor drive/V2L function mode.
Inverter device with integrated two-way OBC function according to Claim 5 , wherein the first motor drive/V2L function mode control includes: a current command value calculation unit configured to generate a d-axis current command value and a q-axis current command value based on the torque command value and the mechanical angular velocity to drive the motor in the motor drive/V2L function mode; a voltage command value calculation unit configured to generate a d-axis voltage command value and a q-axis voltage command value based on the d-axis and q-axis current command values and the d-axis and q-axis current measurements; and a main control signal generation section configured to generate the main string control signal based on the d-axis and q-axis voltage command values.
Inverter device with integrated two-way OBC function according to Claim 5 , wherein the second motor drive/V2L function mode control includes: a V/I conversion section configured to convert the voltage command value to a current command value based on an input sensing voltage; a first load command value computation unit configured to generate a load command value based on an input sensing current and the current command value; and a first PWM modulator configured to generate the auxiliary train control signal based on the operating command value.
Inverter device with integrated two-way OBC function according to Claim 7 , wherein: the auxiliary train unit is connected to the main train unit and is controlled under the control of the controller in motor drive/V2L function mode; the linking unit is switched on under the control of the controller in motor drive/V2L function mode; the main train unit of the integrated inverter is configured to operate as a three-phase inverter under the control of the first motor drive/V2L function mode controller and generates a three-phase drive current in motor drive/V2L function mode, which is supplied to the three-phase inductor of the motor, based on a DC voltage from the battery; and the auxiliary train unit is configured to operate under the control of the second motor drive/V2L function mode controller and generates an AC load current, which is supplied to the AC load connected to the linking unit through an AC filter, based on the DC voltage from the battery.
Inverter device with integrated two-way OBC function according to Claim 4 , wherein the first control unit also includes: a slow charge mode control configured to generate the main train control signal and the auxiliary train control signal based on a battery voltage command value and a battery voltage to perform slow charging of the battery in the slow charge mode to which the AC power supply is connected.
Inverter device with integrated two-way OBC function according to Claim 9 , wherein the slow charging mode control comprises: a first unit for determining the charging mode and calculating the current command value, configured to determine a charging mode and generate a current command value for controlling the slow charging of the battery according to the determined charging mode based on the battery voltage command value, the battery voltage, and an input measurement voltage in the slow charging mode; a second load command value calculation unit configured to generate a load command value based on the current command value, the measurement voltage, and the three-phase drive current of the motor; and a second PWM modulator configured to provide the control signal for the main line and generates the control signal for the auxiliary train based on the command value for the load.
Inverter device with integrated two-way OBC function according to Claim 10 , wherein: the auxiliary string unit is connected to the main string unit and is controlled under the control of the controller in slow charge mode; the link unit is switched on under the control of the controller in slow charge mode; the main string unit of the integrated inverter is configured to operate in slow charge mode under the control of the slow charge mode controller as a three-phase nested totem pole converter and generates a DC voltage to supply slow charge energy to the battery based on a charging current through the AC power; and the auxiliary string unit is configured to provide a portion of the charging current flowing to the AC load connected to the link unit in conjunction with the AC filter under the control of the slow charge mode controller.
Inverter device with integrated two-way OBC function according to Claim 4 , wherein the first control unit also includes: a fast charge mode control configured to generate the main train control signal and the auxiliary train control signal based on a battery voltage command value and a battery voltage to perform fast charging of the battery in fast charge mode.
Inverter device with integrated two-way OBC function according to Claim 12 , wherein the fast charge mode control further comprises: a second charge mode determination unit and a current command value calculation unit configured to determine the charge mode and generate a current command value to control the fast charging of the battery according to the determined charge mode based on the battery voltage command value and the battery voltage in fast charge mode; a third load command value calculation unit configured to generate a load command value based on the current command value, a DC voltage of the DC power, and a DC current between the motor and the integrated inverter; and a third PWM modulator configured to generate the main train control signal and the auxiliary train control signal based on the load command value.
Inverter device with integrated two-way OBC function according to Claim 13 , wherein: the auxiliary string unit is disconnected from the main string and controlled by the controller in fast-charge mode; the link unit is switched on under the control of the controller in fast-charge mode; the main string unit of the integrated inverter is configured to operate as a three-phase nested boost converter under the control of the fast-charge mode controller in fast-charge mode, generating a DC voltage to supply the battery with fast-charge energy based on a DC charging current; the auxiliary string unit of the integrated inverter is not operating; and the AC filter is connected to the auxiliary switch and the link unit and is controlled by the fast-charge mode controller to provide a path for the charging current to flow to the DC load connected to the link unit.
Method for controlling an inverter incorporating a two-way OBC function, comprising: Determining a motor drive/V2L operating mode, a slow charge mode, or a fast charge mode by a controller; and Controlling a main string unit, an auxiliary string unit, a first switch, and a second switch of an integrated inverter according to a preset control sequence for the motor drive/V2L operating mode, the slow charge mode, or the fast charge mode determined in the operating mode determination operation.
Control method of an inverter device with integrated two-way OBC function according to Claim 15 , wherein the control further comprises: a first motor drive/V2L function mode control operation for controlling an auxiliary switch and a connecting unit in the motor drive/V2L function mode and for generating a main string control signal based on a torque command value, a mechanical angular velocity and a dq current and for outputting the main string control signal to the main string unit of the integrated inverter; a second motor drive/V2L function mode control operation of generating an auxiliary string control signal based on an AC voltage command value, an AC current and an AC voltage and for outputting the auxiliary string control signal to the auxiliary string unit in the motor drive/V2L function mode; a slow charge mode control operation to control the auxiliary switch and the connection unit in slow charge mode and to generate a main train control signal and an auxiliary train control signal based on the torque command value, the AC voltage and the AC current; and a fast charge mode control operation to control the auxiliary switch and the connection unit in fast charge mode (DC connection) and to generate a main train control signal and an auxiliary train control signal based on the torque command value and the AC current.
Control method for an inverter device integrated with a two-way OBC function, according to Claim 16 , wherein the first motor drive/V2L function mode control operation further includes: a current command value calculation operation to generate a d-axis current command value and a q-axis current command value based on the torque command value and the mechanical angular velocity to drive a motor in motor drive/V2L function mode; a voltage command value calculation operation to generate a d-axis voltage command value and a q-axis voltage command value based on the d-axis and q-axis current command values; and a control signal generation operation to generate the main string control signal based on the voltage command values for the d-axis and the q-axis.
Control method for an inverter device integrated with a two-way OBC function, according to Claim 16 , wherein the second motor drive/V2L function mode control operation further comprises: a V/I conversion operation to convert the voltage command value into a current command value based on an input measurement voltage; a first load command value calculation operation to generate a load command value based on an input measurement current and the current command value; and a first PWM modulation operation to generate the auxiliary train control signal based on the operating command value.
Control method for an inverter device with integrated two-way OBC function according to Claim 16 , wherein the control process for the slow charging mode further comprises: a first charging mode determination and current command value calculation process to determine a charging mode based on a battery voltage command value, a battery voltage and a measured voltage in the slow charging mode and to generate a current command value to control the slow charging of the battery according to the determined charging mode; a second load command value calculation process to generate a load command value based on the current command value, the measured voltage and a three-phase drive current of the motor; and a second PWM modulation process to generate the control signal for the main train and the control signal for the auxiliary train based on the command value.
Control method for an inverter device with integrated two-way OBC function according to Claim 16 , wherein the fast charge mode control process further comprises: a second charge mode determination and current command value calculation process to determine a charge mode based on a battery voltage command value and a battery voltage in fast charge mode and to generate a current command value to control the fast charging of the battery according to the determined charge mode; a third load command value calculation process to generate a load command value based on the current command value, the DC voltage of the DC power and a DC current between the motor and the integrated inverter; and a third PWM modulation process to generate the main string control signal and the auxiliary string control signal based on the operating command value.

Description

BACKGROUND 1. AREA The present disclosure relates to an inverter with an integrated two-way OBC function and a control method therefor. 2. DESCRIPTION OF THE RELATED STATE OF THE ART In general, electric vehicles are vehicles powered by energy stored in energy storage devices such as batteries. From a propulsion and energy supply perspective, such electric vehicles can be equipped with a motor system to drive a vehicle motor, a charging system to charge a battery, or a V2L converter to support vehicle-to-load (V2L) operation. With the increasing demand for multifunctionality in vehicles, various research and development activities have recently been carried out in connection with the packaging of power electrical (PE) systems in order to improve the usability of the vehicle space while supporting multifunctionality such as engine drive, charging and V2L functions and reducing the space requirement. SUMMARY One aspect of the present disclosure is to provide an inverter device with an integrated two-way OBC function that can connect an AC load as well as AC and DC and can support a motor drive/V2L function mode (AC load connection), a slow charging mode (AC connection) and a fast charging mode (DC connection), as well as a corresponding control method. The aspects that are to be resolved by the present disclosure are not limited to the aspects mentioned above, and other aspects not mentioned here will be clearly understood by experts from the following description. According to one aspect of the present disclosure, an inverter device with integrated two-way OBC functionality is provided, comprising an integrated inverter including a main string unit with N strings connected between a DC terminal connected to a battery and an AC terminal connected to each of the three-phase inductors of a motor, and a pair of high-side and low-side switches connected to the DC terminal; an auxiliary string unit connected or disconnected between a common positive terminal and a common negative terminal of the main string unit, and comprising the pair of high-side and low-side switches; an auxiliary switch connecting the auxiliary string unit or DC to the main string unit according to a motor drive/V2L operating mode (AC load connection), a slow charge mode (AC power connection), or a fast charge mode (DC power connection); and a connection unit for selectively connecting AC load, AC power, or DC power to a has a neutral node of the engine. The inverter device with integrated two-way OBC function is configured to also include an AC filter that is connected between the output terminal of the connection unit and the auxiliary string unit, as well as between the connection unit and the auxiliary switch. The integrated inverter with two-way OBC function is configured to also include a controller that controls the auxiliary switch, main string unit, auxiliary string unit and connection unit of the integrated inverter according to the motor drive/V2L function mode (AC load connection), slow charge mode (AC power connection) or fast charge mode (DC power connection). The controller is configured to include a first controller configured to generate a main string control signal to control a high-side switch and a low-side switch of the main string unit, and an auxiliary string control signal to control a high-side switch and a low-side switch of the auxiliary string unit according to the motor drive/V2L operating mode (AC load connection), the slow charge mode (AC connection), or the fast charge mode (DC connection), and a second controller configured to generate a first switching control signal to control the auxiliary switch of the integrated inverter, and a second switching control signal to control the connection unit according to the motor drive/V2L operating mode (AC load connection), the slow charge mode (AC connection), or the fast charge mode (DC connection). The first controller is configured to include a first motor drive/V2L function mode controller, which is configured to generate a main-train control signal based on a torque command value to drive a motor and output the main-train control signal to the main-train unit in motor drive/V2L function mode (AC load connection), and a second motor drive/V2L function mode controller, which is configured to generate an auxiliary-train control signal based on a voltage command value to execute a V2L function and output the signal to the auxiliary-train unit in motor drive/V2L function mode (AC load connection). The first motor drive/V2L function mode controller is configured to include: a current command value calculation unit configured to generate a d-axis current command value and a q-axis current command value based on the torque command value and the mechanical angular velocity to drive the motor in motor drive/V2L function mode (AC load connection); a voltage command value calculation unit configured to generate a d-axis voltage command value and a q-axis voltage command value