CN-122026740-A - Inverter device integrated with bidirectional vehicle-mounted charging function and control method

CN122026740ACN 122026740 ACN122026740 ACN 122026740ACN-122026740-A

Abstract

The present invention relates to an inverter device integrated with a bidirectional vehicle-mounted charging function and a control method thereof, the inverter device including a main leg unit including N legs connected between a DC terminal to which a battery is connected and an AC terminal to which a motor is connected, and having a pair of upper side switches and lower side switches, an auxiliary leg unit connected or disconnected between a common positive terminal and a common negative terminal of the main leg unit, and including a pair of upper side switches and lower side switches, and an auxiliary switch connecting the auxiliary leg unit or the DC power supply to the main leg unit according to a motor driving/V2L function mode (AC load connection), a slow charging mode (AC power supply connection) or a fast charging mode (DC power supply connection), the connection unit being for selectively connecting one of the AC load, the AC power supply and the DC power supply to a neutral point of the motor.

Inventors

LI TAIYONG
PU CHENGLONG
JIN CHENGKUI
LIN ZHONGJING

Assignees

现代自动车株式会社
起亚株式会社

Dates

Publication Date: 20260512
Application Date: 20250604
Priority Date: 20241108

Claims (20)

1. An inverter device integrated with a bidirectional vehicle-mounted charging function, comprising: An integrated inverter, comprising: a main branching unit including N branches connected between a dc terminal to which a battery is connected and an ac terminal to which a three-phase inductance of a motor is connected, respectively, each of the N branches having a pair of upper side switches and lower side switches connected to the dc terminal, respectively; An auxiliary branching unit connected or separated between a common positive terminal and a common negative terminal of the main branching unit, the auxiliary branching unit including a pair of upper side switches and a lower side switch; An auxiliary switch connecting the auxiliary bypass unit or the DC power supply to the main bypass unit according to a motor driving/external discharging function mode, a slow charging mode or a fast charging mode, and And a connection unit configured to connect one of the ac load, the ac power source, and the dc power source to a neutral point of the motor.
2. The inverter device integrated with the bidirectional vehicle-mounted charging function according to claim 1, further comprising: And an alternating current filter connected between the connection unit and the output terminal of the auxiliary branch unit and between the connection unit and the auxiliary switch.
3. The inverter device integrated with the bidirectional vehicle-mounted charging function according to claim 2, further comprising: And a controller configured to control the auxiliary switch, the main bypass unit, the auxiliary bypass unit, and the connection unit of the integrated inverter according to the motor driving/external discharging function mode, the slow charging mode, or the fast charging mode.
4. The inverter device integrated with the bidirectional vehicle-mounted charging function according to claim 3, wherein the controller includes: a first controller configured to generate a main leg control signal configured to control one of the upper side switch and the lower side switch of the main leg unit and to generate an auxiliary leg control signal for controlling one of the upper side switch and the lower side switch of the auxiliary leg unit according to a motor driving/external discharging function mode, a slow charging mode, or a fast charging mode, and And a second controller configured to generate a first switch control signal for controlling the auxiliary switch of the integrated inverter according to the motor driving/external discharging function mode, the slow charging mode, or the fast charging mode, and to generate a second switch control signal for controlling the connection unit.
5. The inverter device integrated with the bidirectional vehicle charging function according to claim 4, wherein the first controller includes: A first motor driving/discharging function mode controller configured to generate a main branch control signal based on the torque command value and output the main branch control signal to the main branch unit in order to drive the motor in the motor driving/discharging function mode, and And a second motor driving/external discharging function mode controller configured to generate an auxiliary branch control signal based on the voltage command value and output the auxiliary branch control signal to the auxiliary branch unit in order to perform the external discharging function in the motor driving/external discharging function mode.
6. The bi-directional vehicle-mounted charging function integrated inverter apparatus of claim 5, wherein the first motor driving/external discharging function mode controller comprises: 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 in order to drive the motor in the motor driving/external discharge 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 current command value and the q-axis current command value and the d-axis current measurement value and the q-axis current measurement value, and And a main control signal generation unit configured to generate a main branch control signal based on the d-axis voltage command value and the q-axis voltage command value.
7. The bi-directional vehicle-mounted charging function integrated inverter apparatus of claim 5, wherein the second motor driving/external discharging function mode controller comprises: A voltage/current conversion unit configured to convert a voltage command value into a current command value based on an input measurement voltage; A first duty command value calculation unit configured to generate a duty command value based on the input measured current and the current command value, and A first PWM modulator configured to generate an auxiliary branch control signal based on the duty cycle command value.
8. The inverter device integrated with the bidirectional vehicle charging function according to claim 7, wherein: The auxiliary branch unit is connected to the main branch unit under the control of the controller in a motor driving/external discharging function mode; In the motor driving/external discharging function mode, the connecting unit is connected under the control of the controller; In the motor driving/external discharging function mode, a main branching unit of the integrated inverter is configured to operate as a three-phase inverter under the control of the first motor driving/external discharging function mode controller, and generate three-phase driving currents supplied to three-phase inductors of the motor based on the direct-current voltage of the battery; The auxiliary branching unit is configured to operate under control of the second motor driving/external discharging function mode controller, and generates an ac load current supplied to an ac load connected to the connection unit through the ac filter based on a dc voltage of the battery.
9. The bi-directional vehicle-mounted charging function integrated inverter apparatus of claim 4, wherein the first controller further comprises: And a slow charge mode controller configured to generate a main leg control signal and an auxiliary leg control signal based on the battery voltage command value and the battery voltage in order to charge the battery slowly in a slow charge mode connected to the ac power source.
10. The bi-directional vehicle charging function integrated inverter apparatus of claim 9, wherein the slow charging mode controller comprises: A first charging mode determination and current instruction value calculation unit configured to determine a charging mode based on a battery voltage instruction value, a battery voltage, and an input measurement voltage in a slow charging mode, and generate a current instruction value for controlling slow charging of the battery according to the determined charging mode; a second duty command value calculation unit configured to generate a duty command value based on the current command value, the measured voltage, and the three-phase drive current of the motor, and And a second PWM modulator configured to generate a main-leg control signal and an auxiliary-leg control signal based on the duty command value.
11. The inverter device integrated with the bidirectional vehicle charging function according to claim 10, wherein: In the slow charge mode, the auxiliary branching unit is connected to the main branching unit under the control of the controller; In the slow charging mode, the connection unit is connected under the control of the controller; In the slow charging mode, the main branching unit of the integrated inverter is configured to operate as a three-phase interleaved totem pole converter under control of a slow charging mode controller, and generate a direct current voltage for supplying slow charging energy to the battery based on a charging current of the alternating current power supply; The auxiliary branch unit is configured to provide a path for a charging current flowing to an ac load connected to the connection unit in conjunction with an ac filter under the control of the slow charge mode controller.
12. The bi-directional vehicle-mounted charging function integrated inverter apparatus of claim 4, wherein the first controller further comprises: And a fast charge mode controller configured to generate a main leg control signal and an auxiliary leg control signal based on the battery voltage command value and the battery voltage in order to fast charge the battery in the fast charge mode.
13. The bi-directional vehicle charging function integrated inverter apparatus of claim 12, wherein the fast charge mode controller further comprises: A second charging mode determination and current instruction value calculation unit configured to determine a charging mode based on the battery voltage instruction value and the battery voltage in the quick charging mode, and generate a current instruction value for controlling quick charging of the battery according to the determined charging mode; a third duty command value calculation unit configured to generate a duty command value based on the current command value, the DC voltage of the DC power supply, and the DC current between the motor and the integrated inverter, and And a third PWM modulator configured to generate the main leg control signal and the auxiliary leg control signal based on the duty cycle command value.
14. The bi-directional vehicle-mounted charging function integrated inverter apparatus of claim 13, wherein: in the fast charge mode, the auxiliary branch unit is separated from the main branch unit under the control of the controller; in the fast charge mode, the connection unit is turned on under the control of the controller; In the fast charge mode, the main branching unit of the integrated inverter is configured to operate as a three-phase interleaved boost converter under control of the fast charge mode controller and generate a direct current voltage for supplying fast charge energy to the battery based on a charge current of the direct current power supply; the auxiliary branch unit of the integrated inverter does not work; The alternating current filter is connected to the auxiliary switch and the connection unit under the control of the fast charge mode controller to provide a path for a charging current flowing to a direct current load connected to the connection unit.
15. A control method of an inverter device integrated with a bidirectional vehicle-mounted charging function, comprising: a working mode determining operation, namely determining a motor driving/external discharging function mode, a slow charging mode or a fast charging mode by a controller; and an integrated inverter control operation of controlling the main bypass unit, the auxiliary bypass unit, the first switch and the second switch of the integrated inverter according to a preset control sequence of the motor driving/external discharging function mode, the slow charging mode or the fast charging mode determined in the operation mode determining operation.
16. The control method of the inverter apparatus integrated with the bidirectional vehicle-mounted charging function according to claim 15, wherein the integrated inverter control operation further includes: Controlling an auxiliary switch and a connection unit in the motor driving/external discharging function mode, generating a main branch control signal based on a torque command value, a mechanical angular velocity, and a dq-axis current, and outputting the main branch control signal to a main branch unit of the integrated inverter; in the motor driving/external discharging function mode, generating an auxiliary branch control signal based on the voltage command value, the input measurement voltage and the input measurement current value, and outputting the auxiliary branch control signal to the auxiliary branch unit; A slow charge mode control operation of controlling the auxiliary switch and the connection unit in the slow charge mode and generating a main branch control signal and an auxiliary branch control signal based on the battery voltage command value, the battery voltage, and the inputted measured voltage, and And a fast charge mode control operation of controlling the auxiliary switch and the connection unit in the fast charge mode and generating a main leg control signal and an auxiliary leg control signal based on the battery voltage command value, the battery voltage, and the inputted measured direct current voltage.
17. The control method of the inverter apparatus integrated with the bidirectional vehicle-mounted charging function according to claim 16, wherein the first motor driving/external discharging function mode control operation further includes: a current command value calculation operation of generating a d-axis current command value and a q-axis current command value based on the torque command value and the mechanical angular velocity in order to drive the motor in the motor driving/external discharging function mode; a voltage command value calculation operation of generating a d-axis voltage command value and a q-axis voltage command value based on the d-axis current command value and the q-axis current command value, and And a control signal generation operation of generating a main branch control signal based on the d-axis voltage command value and the q-axis voltage command value.
18. The control method of the inverter apparatus integrated with the bidirectional vehicle-mounted charging function according to claim 16, wherein the second motor driving/external discharging function mode control operation further includes: A voltage/current conversion operation of converting a voltage command value into a current command value based on the input measurement voltage; A first duty command value calculation operation of generating a duty command value based on the input measured current and the current command value, and And a first PWM modulation operation of generating an auxiliary branch control signal based on the duty ratio command value.
19. The control method of the inverter apparatus integrated with the bidirectional vehicle-mounted charging function according to claim 16, wherein the slow charge mode control operation further includes: In a slow charging mode, determining a charging mode based on a battery voltage command value, a battery voltage and a measured voltage, and generating a current command value for controlling slow charging of the battery according to the determined charging mode; A second duty command value calculation operation of generating a duty command value based on the current command value, the measured voltage, and the three-phase drive current of the motor, and And a second PWM modulation operation of generating a main branch control signal and an auxiliary branch control signal based on the duty ratio command value.
20. The control method of the inverter apparatus integrated with the bidirectional vehicle-mounted charging function according to claim 16, wherein the rapid charging mode control operation further includes: in the fast charge mode, determining a charge mode based on the battery voltage command value and the battery voltage, and generating a current command value for controlling fast charge of the battery according to the determined charge mode; A third duty command value calculation operation of generating a duty command value based on the current command value, the DC voltage of the DC power supply, and the DC current between the motor and the integrated inverter, and And a third PWM modulation operation of generating a main branch control signal and an auxiliary branch control signal based on the duty ratio command value.

Description

Inverter device integrated with bidirectional vehicle-mounted charging function and control method Cross Reference to Related Applications The present application claims priority from korean patent application No.10-2024-0157635 filed at korean intellectual property office on 8 th 11 th 2024, the entire contents of which are incorporated herein by reference. Technical Field The present invention relates to an inverter device integrated with a bidirectional on-board charging (OBC) function and a control method thereof. Background In general, an electric Vehicle is a Vehicle driven by energy stored in an energy storage device such as a battery, and from the viewpoint of driving and energy supply, such an electric Vehicle may be equipped with a motor system for driving a motor of the Vehicle, a charging system for charging the battery, or a V2L converter for supporting a Vehicle To Load (V2L) function. Recently, as the demand for versatility of vehicles increases, research or development related to packaging of Power Electronic (PE) systems has been conducted in various ways to improve the utilization of vehicle space while supporting versatility such as motor driving, charging, and V2L functions and reducing the occupied area thereof. Disclosure of Invention An aspect of the present invention provides an inverter device integrated with a bidirectional OBC function, which can connect an ac load, an ac power source, and a dc power source, and can support a motor drive/V2L function mode (ac load connection), a slow charge mode (ac power connection), and a fast charge mode (dc power connection), and a control method thereof. The aspects to be solved by the present invention are not limited to the above aspects, and other aspects not mentioned herein will be clearly understood by those skilled in the art from the following description. According to one aspect of the present invention, there is provided an inverter device integrated with a bi-directional OBC function, including an integrated inverter including a main leg unit including N legs connected between DC terminals to which a battery is connected and AC terminals to which three-phase inductances of a motor are respectively connected, and having a pair of upper and lower side switches connected to the DC terminals, an auxiliary leg unit connected or separated between a common positive terminal and a common negative terminal of the main leg unit, and including a pair of upper and lower side switches, and an auxiliary switch connecting the auxiliary leg unit or the DC power supply to the main leg unit according to a motor driving/V2L function mode (AC load connection), a slow charging mode (AC power supply connection) or a fast charging mode (DC power supply connection), the auxiliary leg unit or the DC power supply being selectively connected to a neutral point of the motor. The inverter device integrated with the bidirectional OBC function is configured to further include an ac filter connected between the connection unit and the output terminal of the auxiliary branch unit and between the connection unit and the auxiliary switch. The inverter device integrated with the bidirectional OBC function is configured to further include a controller that controls the auxiliary switch, the main leg unit, the auxiliary leg unit, and the connection unit of the integrated inverter according to a motor drive/V2L function mode (ac load), a slow charge mode (ac power connection), or a fast charge mode (dc power connection). The controller is configured to include a first controller configured to generate a main leg control signal for controlling an upper side switch and a lower side switch of the main leg unit and to generate an auxiliary leg control signal for controlling the upper side switch and the lower side switch of the auxiliary leg unit according to a motor drive/V2L function mode (ac load connection), a slow charge mode (ac power connection), or a fast charge mode (dc power connection), and a second controller configured to generate a first switch control signal for controlling an auxiliary switch of the integrated inverter according to a motor drive/V2L function mode (ac load connection), a slow charge mode (ac power connection), or a fast charge mode (dc power connection). The first controller is configured to include a first motor drive/V2L function mode controller configured to generate a main branch control signal based on a torque command value for driving the motor and output the main branch control signal to the main branch unit in a motor drive/V2L function mode (ac load connection), and a second motor drive/V2L function mode controller configured to generate an auxiliary branch control signal based on a voltage command value for performing a V2L function in the motor drive/V2L function mode (ac load connection), and output the auxiliary branch control signal to the auxiliary branch unit. The first motor drive/V2L function mode controller is configured t