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

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; and 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 an AC load, AC power and DC power to a neutral node of the motor.

Description

BACKGROUND 1. AREA

[0001] 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

[0002] 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.

[0003] 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

[0004] 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.

[0005] 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.

[0006] According to one aspect of the present disclosure, an inverter device with an integrated two-way OBC function is provided, comprising an integrated inverter, which includes 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 switches and low-side switches connected to the DC terminal; an auxiliary string unit, which is connected or disconnected between a common positive terminal and a common negative terminal of the main string unit, and includes the pair of high-side switches and low-side switches; and an auxiliary switch, which connects the auxiliary string unit or DC to the main string unit according to a motor drive / V2L operating mode (AC load connection).connects to a slow charging mode (AC power connection) or a fast charging mode (DC power connection), and has a connection unit for selectively connecting AC load, AC power or DC power to a neutral node of the motor.

[0007] 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.

[0008] 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).

[0009] 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).

[0010] 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).

[0011] 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 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.

[0012] The second motor drive / V2L function mode controller is configured to include a V / I conversion section configured to convert the voltage command value into a current command value based on an input sensing voltage, a first load command value calculation 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 string control signal based on the load command value.

[0013] The auxiliary unit is connected to the main unit under the control of the controller in motor drive / V2L operating mode (AC load connection). The connection unit is switched on under the control of the controller in motor drive / V2L operating mode (AC load connection). The main unit of the integrated inverter operates as a three-phase inverter under the control of the first motor drive / V2L operating mode controller and generates a three-phase drive current to be supplied to the three-phase inductor of the motor based on a DC voltage from the battery in motor drive / V2L operating mode (AC load connection). The auxiliary unit operates under the control of the second motor drive / V2L operating mode controller and generates an AC load current to be supplied to the AC load.which is connected to the connection unit via an AC filter based on the DC voltage of the battery.

[0014] The first controller is configured to also include a slow charge mode controller, which is configured to generate the control signal for the main string and the control signal for the auxiliary string based on a battery voltage command value and a battery voltage, in order to perform a slow charging of the battery in the slow charge mode (AC connection) in which the AC power is connected.

[0015] The slow charge mode control is configured to include a first unit for determining the charging mode and calculating the current command value, which is configured to determine a charging mode and generate a current command value to control the slow charging of the battery according to the determined charging mode based on the battery voltage command value, the battery voltage and the input measurement voltage; in the slow charge mode (AC connection), a second load command value calculation unit, which is 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, which is configured to generate the main string control signal and the auxiliary string control signal based on the load command value.

[0016] The auxiliary unit is connected to the main unit under the control of the controller in slow charge mode (AC connection), the connection unit is switched on under the control of the controller, the main unit of the integrated inverter operates in slow charge mode (AC connection) as a three-phase nested totem-tap converter under the control of the slow charge mode controller, in slow charge mode (AC connection) and generates a DC voltage to supply the battery with slow charge energy based on a charging current through the AC, and the auxiliary unit provides a passage of the charging current that flows to the AC load connected to the connection unit in conjunction with the AC filter under the control of the slow charge mode controller.

[0017] The first controller is configured to also include a fast charge mode controller, which is configured to generate the control signal for the main string and the control signal for the auxiliary string based on the battery voltage command value and the battery voltage, in order to quickly charge the battery in fast charge mode (DC connection).

[0018] The fast-charging mode control unit is configured to further include a second charging mode determination and current command value calculation unit, which is configured to determine the charging mode and generate a current command value to control the fast charging of the battery according to the determined charging mode based on the battery voltage command value and the battery voltage in the fast-charging mode (DC connection); a third load command value calculation unit, which is configured to generate a load command value based on the current command value, the DC voltage of the DC current, and a DC current between the motor and the integrated inverter; and a third PWM modulator, which is configured to generate the control signal for the main train and the control signal for the auxiliary train based on the command value.

[0019] The auxiliary unit is disconnected from the main unit under the control of the controller. In fast charging mode (DC connection), the connection unit is switched on under the control of the controller. In fast charging mode (DC connection), the main unit of the integrated inverter operates as a three-phase nested boost converter under the control of the fast charging mode controller. In fast charging mode (DC connection), it generates a DC voltage to supply the battery with fast charging energy based on a DC charging current. The auxiliary unit of the integrated inverter does not operate, and the AC filter is connected to the auxiliary switch and the connection unit under the control of the fast charging mode controller to provide a path for the charging current flowing to a DC load connected to the connection unit.

[0020] Furthermore, according to another aspect of the present disclosure, a control method for an inverter device with an integrated two-way OBC function is provided, which includes an operating mode determination process for determining a motor drive / V2L function mode, a slow charge mode (AC connection) or a fast charge mode (DC connection), and an integrated inverter control process for controlling a main string unit, an auxiliary string unit, a first switch (mode selector switch) and a second switch (load selector switch) of an integrated inverter according to a preset control sequence for the motor drive / V2L function mode, the slow charge mode (AC connection) or the fast charge mode (DC connection) determined in the operating mode determination process.

[0021] The integrated inverter control process is configured to perform a first motor drive / V2L function mode control operation to control an auxiliary switch and a connection unit in the motor drive / V2L function mode and to generate a main string control signal based on a torque command value, a mechanical angular velocity, and a DC current, and to output the main string control signal to the main string unit of the integrated inverter; a second motor drive / V2L function mode control operation to generate an auxiliary string control signal based on an AC voltage command value, an AC current, and an AC voltage, and to output the auxiliary string control signal to the auxiliary string unit, in the motor drive / V2L function mode.a slow charging mode control operation for controlling the auxiliary switch and the connection unit in the slow charging mode (AC connection) and for generating a main string control signal and an auxiliary string control signal based on the torque command value, the AC voltage and the AC current, and a fast charging mode control operation for controlling the auxiliary switch and the connection unit in the fast charging mode (DC connection) and for generating a main string control signal and an auxiliary string control signal based on the torque command value and the AC current.

[0022] The first motor drive / V2L function mode control operation is configured to include: 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 (AC load connection), 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 d-axis and q-axis voltage command values.

[0023] The second motor drive / V2L function mode control operation is configured to include 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 string control signal based on the load command value.

[0024] The control process for the slow charging mode is configured to include 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 the measured voltage in the slow charging mode (AC connection) 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 main-train control signal and the auxiliary-train control signal based on the load command value.

[0025] The fast charge mode control process is configured to include 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 (DC connection) 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 current 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 work command value.

[0026] Furthermore, the aspects of the present revelation are not limited to the aspects listed above as examples, and other aspects may be additionally understood in the course of the following description.

[0027] According to one aspect of the present disclosure, if an inverter device is integrated with a two-way OBC function, there are advantages that AC load, AC power and DC power can all be connected, and a motor drive / V2L function mode (AC load connection), a slow charge mode (AC power connection) and a fast charge mode (DC power connection) can all be supported.

[0028] When an inverter device with integrated two-way OBC function, as described above, is used, the effect can also be expected to be a reduction in the occupied area, suppression of weight gain and a reduction in costs in vehicles in which the inverter device with integrated two-way OBC function is used.

[0029] The advantages and effects of the present application are not limited to the foregoing content, and other effects not mentioned can be more easily understood in the course of describing a specific embodiment of the present disclosure by means of the following descriptions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other aspects, features and advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings, in which: Fig. 1 a conceptual diagram of an inverter with integrated two-way OBC function according to an embodiment of the present disclosure; Fig. 2 is an example view of an internal configuration of a controller; Fig. 3 is an example view of a first control unit for an engine drive / V2L operating mode; Fig. 4. An example view of an internal configuration of a main control signal generation unit. Fig. 3 is; Fig. 5. An example view of an internal configuration of a first PWM modulator from Fig. 3 is; Fig. 6. An example view of a main signal waveform of Fig. 4 and Fig. 5 is; Fig. Figure 7 is a diagram illustrating the operation of an integrated inverter in a motor drive / V2L operating mode; Fig. 8 An example view of a main signal waveform of the integrated inverter device of Fig. 7 is; Fig. 9 is an example view of an initial control for a slow loading mode; Fig. 10. An example view of an internal configuration of the second PWM modulator of Fig. 9 is; Fig. 11. An example view of the main signal shape of Fig. 10 is; Fig. 12 is a view illustrating the operation of an integrated inverter in a slow charging mode; Fig. 13 An example view of a main signal waveform of the integrated inverter device of Fig. 12 is; Fig. 14 is an explanatory view illustrating a case in which 3-phase alternating current is connected; Fig. 15 is an example view of a first control for a fast load mode; Fig. 16. An example view of an internal configuration of the third PWM modulator of Fig. 15 is; Fig. 17 an example view of the main signal waveform of Fig. 16 is; Fig. 18 is a view illustrating the operation of an integrated inverter device in a fast charging mode; Fig. Figure 19 is an example view showing a change in a main signal of the integrated inverter device. Fig. 17 illustrated; Fig. 20 is a flowchart illustrating a method for controlling an inverter with an integrated two-way OBC function according to an embodiment of the present disclosure; Fig. 21 is a flowchart illustrating an integrated inverter control process; Fig. 22 is a flowchart illustrating an initial motor drive / V2L function mode control process; Fig. 23 is a flowchart illustrating a second motor drive / V2L function mode control process; Fig. 24 is a flowchart illustrating a control process for a slow charging mode; and Fig. 25 is a flowchart illustrating a fast charge mode control process.

[0031] In the drawings and the detailed description, the same reference symbols refer to the same components. The drawings may not be to scale, and the relative sizes, proportions, and representations of the drawing elements may be exaggerated for clarity, explanation, and convenience. DETAILED DESCRIPTION

[0032] A specific embodiment of the present disclosure is described below with reference to the drawings. The following detailed description is intended to help gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, this is only one example, and the present disclosure is not limited to it.

[0033] If, during the detailed description of embodiments of the present disclosure, it is determined that a detailed description of known technologies associated with the present disclosure could unnecessarily obscure the core of the present disclosure, the detailed description will be omitted. Furthermore, the terms described below are defined with reference to the functions in the present disclosure and may vary depending on the intention or practice of a user or operator. Therefore, the definition of these terms should be based on the content of this description. The terms used in the description serve only to describe embodiments and are in no way limiting. Unless explicitly stated otherwise, singular expressions include the plural meaning.In the present description, an expression such as "comprehensive" or "inclusive" is intended to denote a feature, a number, a step, a process, an element, a part or combinations thereof, and is not to be interpreted as excluding the presence or possibility of one or more other features, numbers, steps, operations, elements, parts or combinations thereof.

[0034] Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0035] Fig. Figure 1 is a conceptual diagram of an inverter device with integrated two-way OBC function according to an embodiment of the present disclosure.

[0036] Referring to Fig. 1, an inverter device 50 with integrated two-way OBC function according to an embodiment of the present disclosure can comprise an integrated inverter 100 and a connection unit 500.

[0037] The integrated inverter 100 can include a main string unit 110, an auxiliary string unit 120 and an auxiliary switch 130.

[0038] The main branch unit 110 can include N branches connected between the DC terminals TD1 and TD2, which are connected to a battery 10, and the AC terminals Ta, Tb and Tc, which are connected to each of the three-phase chokes L1, L2 and L3 of a motor 20, and have a pair of high-side switches Q11, Q21 and Q31 and low-side switches Q12, Q22 and Q32, which are connected to the DC terminals TD1 and TD2.

[0039] For example, a common positive terminal T1 of the main string unit 110 can be connected to the first DC terminal TD1, which is connected to a first terminal +Vdc / 2 of two first and second terminals +Vdc / 2 and -Vdc / 2 of the battery 10, and a common negative terminal T2 of the main string unit 110 can be connected to a second DC terminal TD2, which is connected to the second terminal -Vdc / 2 of the battery 10.

[0040] For example, battery 10 can be connected to the first and second DC terminals TD1 and TD2 of the main string unit 110 via the first and second terminals +Vdc / 2 and -Vdc / 2.

[0041] For example, to simplify explanation and understanding, the present disclosure may contain three strands, i.e., the first strands Q11 and Q12, the second strands Q21 and Q22, and the third strands Q31 and Q32, but the present disclosure is not limited to this, and the strands (e.g., the first strands Q11 and Q12) may contain a pair of a high-side switch Q11 and a low-side switch Q12, the second strands Q21 and Q22 may contain a pair of a high-side switch Q21 and a low-side switch Q22, and the third strands Q31 and Q32 may contain a pair of a high-side switch Q31 and a low-side switch Q32.

[0042] For example, one terminal of each of the high-side switches Q11, Q21 and Q31 of the first strands Q11 and Q12, the second strands Q21 and Q22 and the third strands Q31 and Q32 can be connected to a first DC terminal TD1, which is connected to the first terminal +Vdc / 2 of battery 10, and the other terminal of each of the high-side switches Q11, Q21 and Q31 of the first strands Q11 and Q12, the second strands Q21 and Q22 and the third strands Q31 and Q32 can be connected to a terminal of each of the low-side switches Q12, Q22 and Q32 of the first strands Q11 and Q12, the second strands Q21 and Q22 and the third strands Q31 and Q32. Additionally, the other terminal of each of the low-side switches Q12, Q22 and Q32 of the first strands Q11 and Q12, the second strands Q21 and Q22 and the third strands Q31 and Q32 can be connected to the second DC terminal TD2.

[0043] The auxiliary train unit 120 can be connected or disconnected between the common positive terminal T1 and the negative terminal T2 of the main train section and can include a pair of high-side switches Q41 and low-side switches Q42. For example, the auxiliary train unit 120 can be connected between the common positive terminal T1 and the common negative terminal T2 of the main train section 110 (e.g., motor drive / V2L function mode or slow charge mode) or disconnected (e.g., fast charge mode).

[0044] For example, one terminal of the high-side switch Q41 of the auxiliary line unit 120 can be connected to the common positive terminal T1 of the main line section 110, and the other terminal of the high-side switch Q41 of the auxiliary line unit 120 can be connected to a terminal of the low-side switch Q42 of the auxiliary line unit 120. Additionally, the other terminal of the low-side switch Q42 of the auxiliary line unit 120 can be connected to a terminal (terminal a) of the auxiliary switch 130.

[0045] The auxiliary switch 130 can connect the auxiliary train unit 120 or DC to the main train section 110 according to the motor drive / V2L operating mode (AC load connection), the slow charging mode (AC current connection), or the fast charging mode (DC current connection). For example, the auxiliary switch 130 can connect the common negative terminal T2 of the main train section 110 to the other terminal of the auxiliary train unit 120 or to an output terminal Td, which is an intermediate node of the auxiliary train unit 120 according to the motor drive / V2L operating mode (AC load connection), the slow charging mode (AC current connection), or the fast charging mode (DC current connection).

[0046] For example, the intermediate node of the auxiliary string unit 120 can be a node where the high-side switch Q41 and the low-side switch Q42 are connected. The auxiliary switch 130 can, for example, comprise a first switch consisting of a relay with one common terminal (terminal c), one terminal (terminal a), and the other terminal (terminal b).

[0047] In the present disclosure, the motor 20 can be a motor with a three-phase Y-connection consisting of three-phase inductors L1, L2, and L3 based on a neutral node Tn. Each of the three-phase inductors L1, L2, and L3 can be connected to each of the AC terminals Ta, Tb, and Tc of the integrated inverter 100, and the neutral node Tn can be connected to the connection unit 500.

[0048] The connection unit 500 can selectively connect an AC load (V2L functional range), AC or DC to the neutral node Tn of the motor 20.

[0049] For example, the connection unit 500 can include a second switch to connect either the AC load (V2L functional area), the AC power, or the DC power to the neutral node Tn of the motor 20. For example, if the neutral node Tn of the motor 20 is connected to the AC load (V2L functional area) via the connection unit 500, the integrated inverter device of this disclosure can operate in motor drive / V2L functional mode. If the neutral node Tn of the motor 20 is connected to the AC power via the connection unit 500, the integrated inverter device of this disclosure can operate in slow-charge mode. Additionally, the integrated inverter device of this disclosure can operate in fast-charge mode if the neutral node Tn of the motor 20 is connected to the DC power via the connection unit 500. This will be described below with reference to the... Fig. 1 to 19 described.

[0050] Furthermore, with reference to Fig. 1 of the inverter 50, which is equipped with a two-way OBC function, an AC filter 300 and a control unit 600.

[0051] The AC filter 300 can be connected between the connection unit 500 and the output terminal Td of the auxiliary unit 120, and between the connection unit 500 and the auxiliary switch 130. For example, the AC filter 300 can be connected between the output terminal Td of the auxiliary unit 120 and the connection unit 500, as well as between the connection unit 500 and the other terminal (terminal b) of the auxiliary switch 130.

[0052] The AC filter 300 can, for example, contain an inductor L300 and a capacitor C300. One terminal of capacitor C300 can be connected to the neutral node Tn of motor 20 and to terminal T21 of connection unit 500, and the other terminal can be connected to the other terminal T22 of connection unit 500. One terminal of inductor L300 can be connected to the other terminal of capacitor C300, and the other terminal of inductor L300 can be connected to the output terminal Td, which is an intermediate node of auxiliary winding unit 120, and to the other terminal (terminal b) of auxiliary switch 130.

[0053] The control unit 600 can control the auxiliary switch 130, the main string unit 110, the auxiliary string unit 120, and the connection unit 500 of the integrated inverter 100 according to the motor drive / V2L operating mode (AC load connection), the slow charging mode (AC connection), or the fast charging mode (DC connection). This is described below with reference to the Fig. 2 to 19 described.

[0054] For each drawing of the present disclosure, unnecessary redundant descriptions of components with the same symbols and functions can be omitted and possible differences for each drawing can be described.

[0055] Fig. 2 is an example view of an internal configuration of a controller.

[0056] Referring to Fig. 1 and Fig. 2, the controller 600 can include a first controller 600-1 and a second controller 600-2.

[0057] For example, the first controller 600-1 can generate main string control signals Su, Sv and Sw to control the high-side switches Q11, Q21 and Q31 and the low-side switches Q12, Q22 and Q32 of the main string unit 110 according to the motor drive / V2L operating mode (AC load connection), the slow-charging mode (AC current connection) or the fast-charging mode (DC current connection) and can generate an auxiliary string control signal Saux to control the high-side switch Q41 and the low-side switch Q42 of the auxiliary string unit 120.

[0058] For example, the main string control signals Su, Sv and Sw can comprise three-phase string control signals, i.e. a first string control signal Su, a second string control signal Sv and a third string control signal Sw to control three strings, i.e. the first strings Q11 and Q12, the second strings Q21 and Q22 and the third strings Q31 and Q32.

[0059] For example, the first string control signal Su can contain signals S1 and S1, which have a complementary phase to control the high-side switch Q11 and the low-side switch Q12 of the first strings Q11 and Q12. The second string control signal Sv can contain signals S2 and S2, which have a complementary phase to control the high-side switch Q21 and the low-side switch Q22 of the second branches Q21 and Q22. Additionally, the third string control signal Sw can contain signals S3 and S3, which have a complementary phase to control the high-side switch Q31 and the low-side switch Q32 of the third strings Q31 and Q32.

[0060] For example, an auxiliary string control signal Saux signals S41 and S42 can be used to control the high-side switch Q41 and the low-side switch Q42 of the auxiliary string unit 120.

[0061] For example, the second controller 600-2 can generate a first switching control signal Ssw1 to control the auxiliary switch 130 of the integrated inverter 100 according to the motor drive / V2L function mode (AC load connection), the slow charge mode (AC connection) or the fast charge mode (DC connection) and generate a second switching control signal Ssw2 to control the connection unit 500.

[0062] For example, the first switching control signal Ssw1 can be a single-pole (terminal a) switch-on control signal for the auxiliary switch 130 to connect the auxiliary train unit 120 to the main train unit 110 in motor drive / V2L operating mode, a single-pole (terminal a) switch-on control signal for the auxiliary switch 130 to connect the auxiliary train unit 120 to the main train unit 110 in slow charging mode, and another terminal (terminal b) on the control signal for the auxiliary switch 130 can be to disconnect the main train unit 110 and the auxiliary train unit 120 in fast charging mode and to connect terminal 500 or the AC filter 300 to the common negative terminal T2 of the main train unit 110.

[0063] The second switching control signal Ssw2 can be an ON control signal for the AC load connection in motor drive / V2L function mode, an ON control signal for the AC connection in slow charge mode, and an ON control signal for the DC connection in fast charge mode. For example, if the inverter device 50, which is integrated with a two-way OBC function (see Fig. 1) is in a deactivated state, the second switching control signal Ssw2 can be an OFF control signal.

[0064] In the present disclosure, the first controller 600-1 and the second controller 600-2 can be implemented as separate processors or as a single processor, and the present disclosure should not be interpreted as being limited to either of these two processors.

[0065] Additionally, the first controller 600-1 and the second controller 600-2 may be implemented as hardware element(s) or software element(s) or combinations thereof in at least one integrated circuit (IC) integrated into the inverter with two-way OBC function, and the present disclosure should not be construed as being limited to any one of these elements.

[0066] Fig. Figure 3 is an example view of a first 600-1 controller for a motor drive / V2L operating mode.

[0067] With reference to the Fig. 1 to 3 the first controller 600-1 can include a first motor drive / V2L function mode controller 610 and a second motor drive / V2L function mode controller 620.

[0068] The first motor drive / V2L function mode controller 610 can generate main string control signals Su, Sv and Sw based on a torque command value T* for driving a motor and output the torque command value T* to the main string unit 110 in motor drive / V2L function mode (AC load connection).

[0069] The second motor drive / V2L function mode controller 620 can generate an auxiliary train control signal Saux based on a measuring current Iaux, which is entered as a voltage command value Vaux* to execute the V2L function, and output the auxiliary train control signal Saux to the auxiliary train unit 120 in motor drive / V2L function mode (AC load connection).

[0070] The first motor drive / V2L function mode control 610 and the second motor drive / V2L function mode control 620 are described in more detail below.

[0071] For example, the first motor drive / V2L function mode control 610 can include a current command value calculation unit 611, a voltage command value calculation unit 612, and a main control signal generation unit 613.

[0072] The current command value calculation unit 611 can generate a current command value Id* for the d-axis and a current command value Iq* for the q-axis based on the torque command value T* and the mechanical angular velocity Wm for driving a motor in motor drive / V2L function mode (AC load connection).

[0073] The voltage command value calculation unit 612 can generate a d-axis voltage command value Vd* and a q-axis voltage command value Vq* based on the d-axis and q-axis current command values ​​Id* and Iq* and the d-axis and q-axis current measurements Id and Iq.

[0074] Additionally, the main control signal generation unit 613 can generate the main string control signals Su, Sv and Sw based on the voltage command values ​​Vd* and Vq* for the d- and q-axes.

[0075] For example, the second motor drive / V2L function mode controller 620 can include a V / I conversion unit 621, a first load command value calculation unit 622 and a first PWM modulator 623.

[0076] The V / I conversion unit 621 can convert the voltage command value Vaux* into a current command value Iaux* based on an input measurement voltage Vaux. The measurement voltage Vaux can be measured, for example, by a third sensor Sen3 located in the connection unit 500, and can be a voltage supplied to the connection unit 500 by the auxiliary string unit 120.

[0077] The first load command value calculation unit 622 can generate a load command value duax* based on the input measuring current Iaux and the input current command value Iaux*. The measuring current Iaux can, for example, be measured by a fourth sensor Sen4 located in the AC filter 300 and can be a current supplied by the auxiliary string unit 120.

[0078] The first PWM modulator 623 can generate the auxiliary string control signal Saux based on the load command value duax*.

[0079] The first motor drive / V2L function mode control 610 can also include a switching unit 615 with a speed calculation unit 615-1 and an abc / dq conversion unit 615-2.

[0080] The speed calculation unit 615-1 can calculate the electrical angular velocity Wr based on the mechanical angular velocity Wm measured by a first sensor Sen1 for the motor 20, and the abc / dq conversion unit 615-2 can convert the three-phase drive currents Iabc (Ia, Ib and Ic) measured by a second sensor Sen2 into two-phase dq axle current measurements Idq (Id, Iq) using the electrical angular velocity Wr.

[0081] Fig. Figure 4 is an example view of an internal configuration of the main control signal generation unit 613. Fig. 3.

[0082] Referring to Fig. 4, the main control signal generation unit 613 can comprise a dq / abc conversion unit 613-1, a load operating unit 613-2 and a signal generation unit 613-3.

[0083] The dq / abc conversion unit 613-1 can convert the two-phase d-axis and q-axis voltage command values ​​Vd* and Vq* into the three-phase first voltage command values ​​Vus*, Vvs* and Vws*.

[0084] The load operating unit 613-2 can generate the three-phase operating command values ​​du*, dv* and dw* by operations (e.g. subtraction, multiplication and addition) on the first voltage command values ​​Vus*, Vvs* and Vws*.

[0085] For example, the 613-2 calculation unit can generate an average voltage command value Vsn* by adding and averaging a minimum and a maximum value based on the first voltage command values ​​Vus1*, Vvs1*, and Vws1*, and can generate second voltage command values ​​Vun2*, Vvn2*, and Vwn2* by subtracting the first voltage command values ​​Vus1*, Vvs1*, and Vws1*, and can generate the three-phase load command values ​​du*, dv*, and dw** by dividing a set voltage value (e.g., 0.5 Vdc) by the second voltage command values ​​Vun2*, Vvn2*, and Vwn2* and adding a command value (e.g., 0.5).

[0086] Additionally, the signal comparison unit 613-3 can generate the main string control signals Su, Sv and Sw by comparing the three-phase load command values ​​du*, dv* and dw* with a reference voltage Vcarr.

[0087] The in Fig. The internal configuration of the main control signal generation unit 613 shown in Figure 4 is only an example for better understanding and explanation, and therefore the present disclosure is not limited to it.

[0088] Fig. Figure 5 is an example view of an internal configuration of the first PWM modulator 623 from Fig. 3.

[0089] Referring to Fig. 5 The first PWM modulator 623 can include a calculation unit 623-1 and a comparison unit 623-2.

[0090] The calculation unit 623-1 can generate an added load command value duax1* by adding a set constant (e.g. 0.5) to the load command value duax*.

[0091] The comparator unit 623-2 can generate an auxiliary string control signal Saux by comparing an added load command value duax1** and the reference voltage Vcarr.

[0092] The in Fig. The internal configuration of the first PWM modulator 623 shown in Figure 5 is only an example for better understanding and explanation, and the present disclosure is not limited to it.

[0093] Fig. 6 is an example view of the main signal waveforms of Fig. 4 and Fig. 5.

[0094] Fig. Figure 6 illustrates, in the order of presentation, an example view of an AC signal with a phase difference of 120 degrees for the three-phase voltage reference values ​​Vus*, Vvs* and Vws*, an example view of a signal waveform with a triangular shape for the middle voltage reference value Vsn*, an example view of an AC signal with a phase difference of 120 degrees for the second voltage reference values ​​Vun, Vvn* and Vwn*, an example AC signal waveform with a position difference of 120 degrees for the three phase duty cycle reference values ​​du*, dv* and dw*, an example AC signal waveform for the load reference value duax*, an example voltage signal waveform of a triangular shape with a minimum of 0 V and a maximum of 1 V for the reference voltage Vcarr and a graph illustrating the switching on and off operations of the auxiliary switch 130.

[0095] Fig. Figure 7 is a diagram showing the operation of the integrated inverter in motor drive / V2L operating mode.

[0096] When explaining the operation of the integrated inverter device 50 in motor drive / V2L operating mode with reference to Fig. 7. The auxiliary string unit 120 can first be connected to the main string unit 110 under the control of the control unit 600 in motor drive / V2L function mode (AC load connection).

[0097] For example, under the control of the first switching control signal Ssw1 of the second control 620, the common terminal (terminal c) of the auxiliary switch 130 can be connected to a terminal (terminal a). Accordingly, the auxiliary line unit 120 can be connected to the main line unit 110 via the auxiliary switch 130.

[0098] Furthermore, the connection unit 500 can be switched on under the control of the controller 600 in motor drive / V2L function mode (AC load connection), so that the AC load can be connected to the neutral node Tn of the AC filter 300 and the motor 20.

[0099] For example, the connection unit 500 can be switched on according to the second switching control signal Ssw2 of the second control 620, so that the AC load can be connected to the neutral node Tn of the motor 20 and the AC filter 300.

[0100] In describing the operation of the integrated inverter 100, the main string section 110 can operate as a three-phase inverter under the control of the first motor drive / V2L function mode control section 610 in motor drive / V2L function mode (AC load connection), and can generate three-phase drive currents Idr (IL_u, IL_v and IL_w) which are to be supplied to the three-phase chokes L1, L2 and L3 of the motor 20 based on the DC voltage of the battery 10 of the first and second DC terminals TD1 and TD2, and can output these same currents to the motor 20 via the AC terminals Ta, Tb and Tc. The three-phase drive current Idr can be supplied to the motor 20 so that the motor 20 can be driven.

[0101] In order for the integrated inverter 100 to operate, for example, as a three-phase inverter according to the main string control signals Su, Sv and Sw of the first controller 600-1, the high-side switches Q11, Q21 and Q31 and the low-side switches Q12, Q22 and Q32 contained in the main string unit 110 can operate according to the signals S1 and S1, the signals S2 and S2 and the signals S3 and S3, which have complementary phases of the main string control signals Su, Sv and Sw, so that the DC voltage of the battery 10 at the first and second DC terminals TD1 and TD2 can be converted into the three-phase driver currents IL_u, IL_v and IL_w and output via the AC terminals Ta, Tb and Tc.

[0102] In detail, for example, the high-side switch Q11 and the low-side switch Q12 of the main line unit 110 can be switched on / off complementarily, the high-side switch Q21 and the low-side switch Q22 can also be switched on / off complementarily, and the high-side switch Q31 and the low-side switch Q32 can also be switched on / off complementarily. That is, the high-side switches Q11, Q21, and Q31 can be switched on sequentially in order of a phase difference of 120 degrees, and correspondingly, the low-side switches Q12, Q22, and Q32 can be switched off sequentially in order of a phase difference of 120 degrees. This process allows a DC / AC conversion to be performed in the main line section 110, and ultimately, three-phase drive currents IL_u, IL_v, and IL_w can be generated.

[0103] Since the operation of the main string section 110 of the integrated inverter 100 in the present disclosure corresponds to the operation of a typical three-phase inverter, a more detailed description is omitted in the present disclosure.

[0104] Additionally, the auxiliary drive unit 120 can operate under the control of the second motor drive / V2L function mode control section 620 and generate an AC load current Iaux (e.g., V2L function current) which is supplied to the AC load connected to the connection section 500 via the AC filter 300, based on the DC voltage of the battery 10. The AC load current Iaux (e.g., V2L function current) can be supplied to the AC load via the connection section 500.

[0105] For example, the high-side switch Q41 and the low-side switch Q42, which are contained in the auxiliary string unit 120, can operate with complementary phases of the auxiliary string control signal Saux according to the signals S41 and S42, so that the auxiliary string unit 120 of the integrated inverter 100 can generate an AC load current Iaux according to the auxiliary string control signal Saux of the first controller 600-1, and thus the DC voltage of the battery 10 can be converted into an AC load current Iaux (e.g. V2L functional current).

[0106] In detail, for example, the high-side switch Q41 and the low-side switch Q42 of the auxiliary unit 120 can be switched on and off complementarily to generate an AC load current Iaux. For example, when the high-side switch Q41 is in an on state, the low-side switch Q42 is in an off state, and conversely, when the high-side switch Q41 is in the off state, the low-side switch Q42 can be in the on state. Through this process, a DC / AC conversion can be carried out in the auxiliary unit 120, and finally, an AC load current Iaux can be generated.

[0107] Fig. Figure 8 is an example view of the main signal waveform of the integrated inverter of Fig. 7.

[0108] Fig. Figure 8 illustrates, for example, a sample main signal waveform view that demonstrates simulation results of the integrated inverter device according to the motor drive / V2L operating mode.

[0109] With reference to Fig. 8 begins a simulation sequence of Fig. 8 with motor current control for torque control from time T1 (e.g. 0.1 s) and can perform voltage control for the V2L function from time T2.

[0110] First, a waveform of the currents Iq and Iq in the dq-axis illustrates a current in the dq-axis for the torque control of a permanent magnet motor (e.g., SPMSM). Starting with a permanent magnet synchronous motor (SPMSM), the results of the control are shown by inputting a current command value of 10 A for the q-axis and 0 A for the d-axis from T1 (e.g., 0.1 s) to T2 (e.g., 0.2 s).

[0111] Next, a waveform of the motor drive currents Idr (IL_u, IL_v, and IL_w) illustrates the three-phase motor current of the U, V, and W phases of motor 20 through the chokes L1, L2, and L3 of motor 20. It can be confirmed that the motor currents IL_u, IL_v, and IL_w are regulated to 10Apk for torque output before time T2 (e.g., 0.2 s). It can also be confirmed, for example, that an offset value of the three-phase current fluctuates when the voltage regulation for V2L operation is performed from T3 (e.g., 0.3 s).

[0112] The waveforms of the V2L load voltage V_V2L and the V2L load current I_V2L illustrate the voltage and current of the V2L load. It can be seen that the V2L load is simulated as a resistive load and that the V2L voltage and current are in phase. It can be confirmed that the RMS value of the V2L voltage is regulated from 0 V to 220 V between time T3 (e.g., 0.3 s) and time T4 (e.g., 0.4 s). It can also be confirmed that after time T4 (e.g., 0.4 s), the inverter constantly supplies approximately 3 kW of the power consumed by the V2L load.

[0113] Fig. Figure 9 is an example view of the first 600-1 controller for slow loading mode.

[0114] Referring to Fig. 9. The first controller 600-1 can contain a reg controller for the slow charging mode 630.

[0115] For example, the slow charge mode control 630 can, based on a battery voltage command value Vbat* and a measurement voltage Vaux inputted by the battery voltage Vbat, generate main string control signals Su, Sv and Sw as well as an auxiliary string control signal Saux for the purpose of slow charging the battery 10 in slow charge mode (AC connection) in which the AC is connected.

[0116] The slow-charge mode controller 630 can, for example, include a unit 631 for determining the first charging mode and calculating the current command value, a unit 632 for calculating the second command value, and a second PWM modulator 633.

[0117] The first unit 631, for determining the charging mode and calculating the current command value, can determine a charging mode based on the battery voltage command value Vbat*, the battery voltage Vbat, and the input measurement voltage Vaux in slow charging mode (AC connection) and generate the current command value Iaux* to control the slow charging of battery 10 according to the determined charging mode. The measurement voltage Vaux can be measured, for example, by the third sensor Sen3, which is located in the connection unit 500.

[0118] The second unit for calculating the load command value 632 can generate the load command value duax* based on the current command value Iaux*, the measuring voltage Vaux, and a three-phase drive current Iabc of the motor 20. The three-phase drive current Iabc can be measured, for example, by a second sensor Sen2, which is located in the output terminal of the integrated inverter 100.

[0119] In addition, the second PWM modulator 633 can generate the control signals Su, Sv and Sw for the main strand as well as a control signal Saux for the auxiliary strand based on the load command value duax*.

[0120] Fig. Figure 10 is an example view of an internal configuration of the second PWM modulator 633 from Fig. 9.

[0121] Referring to Fig. 10 The second PWM modulator 633 can comprise an input comparator unit 633-1, an inverting unit 633-2, a first operating unit 633-3, a second operating unit 633-4, a third operating unit 633-5 and an output comparator unit 633-6.

[0122] For example, the input comparator unit 633-1 can compare the input auxiliary voltage Vaux with the zero voltage and output a first auxiliary voltage Vaux1 whose level is higher than the zero voltage.

[0123] The inverting unit 633-2 can invert the first auxiliary voltage Vaux1 output by the input comparator unit 633-1 to generate an auxiliary string control signal Saux.

[0124] The first computing unit 633-3 can multiply the load command value duax* with the first auxiliary voltage Vaux1 output by the input comparator unit 633-1 and output a first load command value duax-1*.

[0125] The second operating unit 633-4 can add a set value (e.g. 1) to the load command value duax* and can multiply the auxiliary train control signal Saux output by the inverter unit 633-2 to output a second load command value duax-2*.

[0126] The third operating unit 633-5 can add the second load command value duax-2* issued by the second operating unit 633-4 to the first load command value duax-1* issued by the first operating unit 633-3 to generate a third load command value daux3*.

[0127] Additionally, the output comparator unit 633-6 can generate the main string control signals Su, Sv and Sw by comparing the third load command value daux3* and the three-phase reference voltages Vcarr_u, Vcarr_v and Vcarr_w.

[0128] The in Fig. Figure 10, the illustrated internal configuration of the second PWM modulator 633, is only an example for better understanding and explanation and is not limited to this.

[0129] Fig. 11 is an example view of the main signal shape of Fig. 10.

[0130] Fig. Figure 11 illustrates, in the order of presentation, an example view of an AC signal waveform for a load command value daux*, an example view of a waveform for a third load command value daux3*, a triangular voltage signal waveform with a minimum of 0 V and a maximum of 1 V for three-phase reference voltages Vcarr_u, Vcarr_v and Vcarr_w, an AC signal waveform example view for an auxiliary voltage Vaux, a pulsed signal waveform example view for an auxiliary string control signal Saux and a graph illustrating the switching on and off operations of the auxiliary switch 130.

[0131] Fig. Figure 12 is a view illustrating the operation of an integrated inverter in a slow charging mode.

[0132] Referring to Fig. 12. In describing the operation of the integrated inverter device 50 in slow-charging mode, the auxiliary string unit 120 can first be connected to the main string unit 110 under the control of the controller 600 in slow-charging mode (AC connection). This is the same as the operation in motor drive / V2L function mode, which is described with reference to Fig. Section 7 is explained, and therefore further descriptions are omitted.

[0133] The connection unit 500 can be switched on under the control of the controller 600 in slow charging mode (AC connection) and can connect AC to the neutral node Tn of the motor 20.

[0134] In the description of the operation of the integrated inverter 100, the main string unit 110 can additionally operate in slow charging mode (AC connection) as a three-phase nested totem pole converter (totem_pol converter) under the control of the slow charging mode controller 630.

[0135] In detail, the main section 110 of the integrated inverter 100 can receive charging currents Icha (IL1, IL2 and IL3) from the AC power via the three-phase chokes L1, L2 and L3 of the motor 20 via the AC terminals Ta, Tb and Tc, and the three-phase chokes L1, L2 and L3 of the motor 20 and the high-side switches Q11, Q21 and Q31 and the low-side switches Q12, Q22 and Q32, which are contained in the main section 110 of the integrated inverter 100, can operate as a single-phase boost converter, thereby generating a DC voltage Vdc to supply slow charging energy to the first and second DC terminals TD1 and TD2 of the battery 10 based on a charging current Icha from the AC power.

[0136] In order for the integrated inverter 100 to operate, for example, as a single-phase boost converter according to the main string control signals Su, Sv and Sw of the first controller 600-1, the high-side switches Q11, Q21 and Q31 and the low-side switches Q12, Q22 and Q32 contained in the main string unit 110 can operate according to the signals S1 and S1, the signals S2 and S2 and the signals S3 and S3 of the main string control signals Su, Sv and Sw, which have complementary phases to each other, so that the charging current Icha of the alternating current input via the AC terminals Ta, Tb and Tc can be converted into a DC voltage Vdc and supplied to the battery 10 via the first and second DC terminals TD1 and TD2, thereby charging the battery 10.

[0137] In detail, for example, the high-side switches Q11, Q21, and Q31 of the main string unit 110 can be switched on sequentially with a phase difference of 120 degrees, and accordingly, the low-side switches Q12, Q22, and Q32 can perform an on / off switching operation. This process allows an AC / DC conversion to be carried out in the main string unit 110, and ultimately, a DC voltage V / dc can be generated from the AC power for charging.

[0138] In addition, the auxiliary string unit 120 of the integrated inverter 100 in conjunction with the AC filter 300 under the control of the slow charge mode control 630 can provide part of the charging current Icha that flows to the AC load connected to the connection unit 500.

[0139] Fig. Figure 13 is an example view of a main signal waveform of the integrated inverter device of Fig. 12.

[0140] Fig. Figure 13 illustrates an example of the waveforms of the main signals according to the simulation results, e.g. when the slow loading mode is operating.

[0141] Referring to Fig. 13 starts a simulation sequence of Fig. 13 the PFC current control for slow charging from time T0 (e.g. 0.01s).

[0142] First, the waveforms of the grid voltage Vgrid and the current Icha show the grid voltage Vgrid of the AC power supply to the charging equipment (e.g., EVSE: Electric Vehicle Supply Equipment) and the AC current Icha, which is the sum of the currents flowing through the three phases of the motor during charging. For example, the grid voltage Vgrid has an RMS value of 220 V, and the AC current Icha starts at an RMS value of 0 A and increases to approximately 50 A for 0.2 s to regulate the power to approximately 11 kW. Furthermore, the phase of the AC current Icha during a charging process can be viewed in reverse with respect to a grid voltage phase if the flow from the inverter to the grid is viewed in the forward direction.

[0143] The waveform of the DC voltage Vdc shows that the battery voltage is charged through the slow charging process and gradually increases from an initial voltage of 800 V.

[0144] Next, a curve of the charging power P_PFC is shown, resulting from measurements of the charging power magnitude during the slow charging process. It can be confirmed that the charging power also increases from 0 W to 11 kW as the charging current increases from time T0 (e.g., 0.01 s) to time T2 (e.g., 0.2 s).

[0145] Fig. 14 is an explanatory view for a case in which a three-phase alternating current is connected.

[0146] With reference to Fig. 14 can be in the inverter device 50, which is equipped with a two-way OBC function (see Fig. 1) of the present disclosure is integrated, a single-phase alternating current power to the connection unit 500 (see Fig. 1) in Fig. 12 can be connected, and in contrast, as in Fig. Figure 14 illustrates how a three-phase alternating current power supply can be connected to a 500' connection unit.

[0147] In this case, the main string section 110 of the integrated inverter 100 can operate as a power factor compensation converter (PFC converter) in the same way as the main string section 110 of Fig. 12.

[0148] However, the auxiliary string unit 120 can also be in a switched-off mode state.

[0149] Fig. Figure 15 is an example view of a first 600-1 controller for a fast-load mode.

[0150] As in Fig. As shown in Figure 15, the first controller 600-1 can contain a fast-charging mode controller 640.

[0151] The fast charge mode controller 640 can, for example, generate the main string control signals Su, Sv and Sw and the auxiliary string control signal Saux based on the battery voltage command value Vbat* to quickly charge the battery 10 in fast charge mode (DC connection).

[0152] Referring to Fig. Section 15 describes an example of an internal configuration of the 640 fast charging control unit.

[0153] Referring to Fig. 15 The fast charge mode controller 640 can include a second unit for determining the charge mode and calculating the current command value 641, a third unit for calculating the command value 642 and a third PWM modulator 643.

[0154] The second unit 641, for determining the charging mode and calculating the current command value, can determine a charging mode based on the battery voltage command value Vbat* and the battery voltage Vbat in fast-charging mode (DC connection) and generate a current command value Idc* to control the fast charging of battery 10 according to the determined charging mode. For example, a constant current (CC) charging mode can initially be set, and a constant voltage (CV) charging mode can be changed if the charging voltage exceeds a certain reference.

[0155] The third unit for calculating the load command value 642 can generate a load command value ddc* based on the current command value Idc*, the DC voltage Vdc of the DC power, and a DC current Idc between the motor 20 and the integrated inverter 100. The DC current Idc can be measured, for example, by the second sensor Sen2, which is located in a power supply line between the motor 20 and the integrated inverter 100. The DC voltage Vdc can be measured by a fourth sensor Sen4, which is located in the connection unit 500.

[0156] The third PWM modulator 643 can generate the control signals Su, Sv and Sw for the main strand and the control signal Saux for the auxiliary strand based on the load command value ddc*.

[0157] Fig. Figure 16 is an example view of an internal configuration of the third PWM modulator 643 from Fig. 15.

[0158] Referring to Fig. 16 The third PWM modulator 643 can include a unit for adjusting the auxiliary string control signal 643-1 and an output comparator unit 6443-1.

[0159] For example, the 643-1 unit can output an off signal (low-level signal) for the signals S41 and S42 contained in the auxiliary control signal Saux for setting the auxiliary control signal.

[0160] The output comparator 6443-1 can compare the load command value ddc* and the three-phase reference voltages Vcarr_u, Vcarr_v and Vcarr_w to generate main string control signals Su, Sv and Sw.

[0161] The in Fig. Figure 16, the illustrated internal configuration of the third PWM modulator 643, is only an example for better understanding and clarification, and therefore the present disclosure is not limited to it. In the present disclosure, both the high level and the off level can be logic 1 or logic 0, and the high level and the low level can be voltage levels, and the present disclosure is not limited to this. Even though an active-high level system is described in the disclosure as an example, this is only an example for better explanation and understanding, and therefore the present disclosure is not limited to it and can also be applied to an active-low system.

[0162] Fig. 17 is an example view of the main signal shape of Fig. 16.

[0163] Fig. Figure 17 shows, in order of presentation, a diagram for a command value signal with a constant value between 0 and 1 for the DC command value ddc*, a triangular voltage signal waveform with a minimum of 0 V and a maximum of 1 V for the three-phase reference voltages Vcarr Vcarr_u, Vcarr_v and Vcarr_w, a view illustrating an operating state of the high-side switch Q41 and the low-side switch Q42 according to the auxiliary string control signal Saux, and a diagram illustrating the switching on and off operations of the auxiliary switch 130.

[0164] Referring to Fig. 17 The high-side switch Q41 and the low-side switch Q42 of the auxiliary train unit 120 are in a switched-off state.

[0165] Fig. Figure 18 is a view illustrating the operation of an integrated inverter in fast charging mode.

[0166] Referring to Fig. 18 When describing the operation of the integrated inverter device 50 in fast charging mode, the auxiliary string unit 120 can first be disconnected from the main string unit 110 under the control of the controller 600 in fast charging mode (DC connection), and in this case the two switches Q41 and Q42 of the auxiliary string unit 120 can be in an off state.

[0167] The connection unit 500 can be switched on in fast charging mode (DC connection) under the control of the controller 600, and accordingly the DC can be connected via the connection unit 500 to the AC filter 300 and the neutral node Tn of the motor 20.

[0168] Next, the main string section 110 of the integrated inverter 100 can operate as a three-phase nested boost converter under the control of the fast charge mode controller 640 in fast charge mode (DC connection).

[0169] Specifically, the main section 110 can generate a DC voltage Vdc to supply the battery 10 with fast-charging energy based on the charging current Icha via the DC power supply. In this case, the auxiliary section 120 of the integrated inverter 100 is not in operation.

[0170] In addition, the AC filter 300 can be connected to the auxiliary switch 130 and the connection unit 500 to provide a passage for the charging current Icha under the control of the fast charging mode control 640, which flows to the DC load connected to the connection unit 500.

[0171] Fig. 19 is an example view showing a change to a main signal of the integrated inverter device from Fig. 17 shows.

[0172] Fig. Figure 19 shows an example of changes to the main signals according to the simulation results, e.g. when the fast charging mode is working.

[0173] Referring to Fig. 19 starts a simulation sequence of Fig. 19 the DC control for fast charging from time TO (e.g. 0.01s).

[0174] First, a graph of the DC voltage V_EVSE illustrates an example of a voltage change in the DC power of the charging device EVSE, and a graph of the DC charging current I_conv illustrates an example of changes in the current, which is the sum of the currents flowing in the three-phase inductors L1, L2, and L3 of motor 20 during charging. For example, it can be confirmed that the DC power voltage V_EVSE is approximately 400 V and the magnitude of the DC charging current I_conv starts at 0 A, is regulated at approximately 70 kW, and increases for T2 (e.g., 0.2 s) to be regulated at approximately 200 A.

[0175] Next, a graph of the DC charging voltage Vdc is shown, in which the battery voltage is charged by the fast charging process and rises from an initial voltage of 800 V. It can be confirmed, for example, that DC voltage Vdc has a higher charging power than that of the slow charging mode, so the rate of voltage increase during the charging process is faster.

[0176] Next, a graph of the charging power P_conv is shown, illustrating a change in charging power and measuring the magnitude of the charging power during fast charging. For example, it can be seen that the charging process begins at time T0 (e.g., 0.01 s) and the charging power increases from 0 W to 70 kW as the magnitude of the charging current increases around time T2 (e.g., 0.2 s).

[0177] The following refers to the Fig. References 20 to 25 describe a control method for controlling an integrated inverter device with two-way OBC functionality. In this disclosure, the description of the control method for controlling an integrated inverter device with two-way OBC functionality and the description of the integrated inverter device with two-way OBC functionality can be applied complementarily or jointly, provided they are not mutually exclusive. Accordingly, overlapping descriptions can be omitted. A main process of the control method for controlling an integrated inverter with two-way OBC functionality is described below.

[0178] Fig. Figure 20 is a flowchart showing an inverter device with a two-way OBC function control method according to an exemplary embodiment of the present disclosure.

[0179] With reference to Fig. 2 and Fig. 20 A control method of an inverter device which is integrated with a two-way OBC function, according to an embodiment of the present disclosure, can be carried out by the inverter device 50 which is integrated with a two-way OBC function.

[0180] With reference to Fig. 1 and Fig. 20 The control procedure of the inverter device, which is integrated with a two-way OBC function, can include an operating mode determination process (S100) and an integrated inverter control process (S200).

[0181] First, the inverter device 50, which is equipped with a two-way OBC function, can determine the motor drive / V2L function mode, the slow charging mode (AC connection) or the fast charging mode (DC connection) during the operating mode determination process (S100).

[0182] Next, the inverter device 50, which is integrated with a two-way OBC function, can control the main string section 110, the auxiliary string unit 120, the first switch (mode selector switch) 130 and the second switch (load selector switch) of the integrated inverter 100 in the integrated inverter control operation (S200) according to a preset control sequence for the motor drive / V2L function mode, the slow charge mode (AC connection) or the fast charge mode (DC connection) that were specified in the mode determination operation (S100).

[0183] Fig. Figure 21 is a flowchart illustrating an integrated inverter control process (S200).

[0184] With reference to Fig. 1 and Fig. 21 The integrated inverter control operation (S200) can include a first motor drive / V2L function mode control operation (S210), a second motor drive / V2L function mode control operation (S220), a slow charge mode control operation (S230) and a fast charge mode control operation (S240).

[0185] In the first motor drive / V2L function mode control operation (S210), the inverter device 50 integrated with a two-way OBC function can control the auxiliary switch 130 and the connection unit 500 in motor drive / V2L function mode and generate main string control signals Su, Sv and Sw based on the torque command value T*, the mechanical angular velocity Wm and the dq current Idq and output these to the main string area 110 of the integrated inverter 100.

[0186] In the second motor drive / V2L function mode control operation (S220), the inverter device 50, which is integrated with a two-way OBC function, can generate an auxiliary train control signal Saux based on an AC voltage command value Vac*, an AC current Iac and an AC voltage Vac in the motor drive / V2L function mode and output the same to the auxiliary train unit 120.

[0187] In the control process for the slow charge mode (S230), the inverter device 50, which is integrated with a two-way OBC function, can control the auxiliary switch 130 and the connection unit 500 in slow charge mode (AC connection) and generate main string control signals Su, Sv and Sw as well as an auxiliary string control signal Saux based on the Vba torque command value T*, the AC voltage Vac and the AC current Iac.

[0188] In addition, the inverter device 50, which is equipped with a two-way OBC function, can control the auxiliary switch 130 and the connection unit 500 in fast charging mode (DC connection) and generate the control signals Su, Sv and Sw for the main string as well as the control signal Saux for the auxiliary string based on the torque command value T* and the alternating current Iac (S240).

[0189] Fig. Figure 22 is a flowchart illustrating the first motor drive / V2L function mode control operation (S210).

[0190] With reference to Fig. 1 and Fig. 22 the first motor drive / V2L function mode control operation (S210) can include a current command value calculation operation (S211), a voltage command value calculation operation (S212) and a control signal generation operation (S213).

[0191] For example, the inverter device 50, which is integrated with a two-way OBC function, can generate the d-axis current command value Id* and the q-axis current command value Iq* in the current command value calculation operation (S211) in the motor drive / V2L function mode (AC load connection) to drive a motor based on the torque command value T* and the mechanical angular velocity Wm.

[0192] When calculating the voltage command value (S212), the inverter device 50 equipped with a two-way OBC function can generate the d-axis voltage command value Vd* and the q-axis voltage command value Vq* based on the d-axis and q-axis current command values ​​Id* and Iq*.

[0193] In addition, the inverter device 50, which is equipped with a two-way OBC function, can generate the main voltage control signals Su, Sv and Sw based on the d-axis and q-axis voltage command values ​​vd* and vq* during control signal generation (S213).

[0194] Fig. Figure 23 is a flowchart illustrating the second motor drive / V2L function mode control operation (S220).

[0195] With reference to Fig. 1 and Fig. 23 the second motor drive / V2L function mode control operation (S220) can include a V / I conversion operation (S221), a first operating command value calculation operation (S222) and a first PWM modulation operation (S213).

[0196] For example, the inverter device 50, which is equipped with a two-way OBC function, can convert the voltage command value Vaux* into the current command value Iaux* based on the input measurement voltage Vaux in the V / I conversion process (S221).

[0197] In the first operation to calculate the load command value (S222), the inverter device 50, which is integrated with a two-way OBC function, can generate the load command value duax* based on the input measuring current Iaux and the current command value Iaux*.

[0198] In addition, the inverter device 50, which is equipped with a two-way OBC function, can generate the auxiliary string control signal Saux based on the load command value duax* in the first PWM modulation operation (S213).

[0199] Fig. Figure 24 is a flowchart showing the control process for the slow charging mode (S230).

[0200] With reference to Fig. 1 and Fig. 24 The slow charge mode control operation (S230) can include a first charge mode determination and current command value calculation operation (S231), a second load command value calculation operation (S232), and a second PWM modulation operation (S233).

[0201] For example, in the first operation to determine the charging mode and calculate the current command value (S231), the inverter device 50 can determine a charging mode based on the battery voltage command value Vbat*, the battery voltage Vbat and the measurement voltage Vaux in the slow charging mode (AC connection) and generate a current command value Iaux* to control the slow charging of the battery 10 according to the determined charging mode.

[0202] In the second operation for calculating the load command value (S232), the inverter device 50, equipped with a two-way OBC function, can generate the load command value duax* on the basis of the current command value Iaux*, the measuring voltage Vaux and the three-phase drive current Iabc of the motor 20.

[0203] Furthermore, the inverter device 50, which is equipped with a two-way OBC function, can generate the main string control signals Su, Sv and Sw as well as the auxiliary string control signal Saux based on the command value duax* in the second PWM modulation mode (S233).

[0204] Fig. 25 is a flowchart illustrating the fast charge mode control process (S240).

[0205] With reference to Fig. 1 and Fig.25 The fast charge mode control operation (S240) can include a second charge mode determination and current command value calculation operation (S241), a third load command value calculation operation (S242), and a third PWM modulation operation (S243).

[0206] For example, in the second operation for determining the charging mode and calculating the current command value (S241), the inverter device 50, which is equipped with a two-way OBC function, can determine a charging mode based on the battery voltage command value Vbat* and the battery voltage Vbat in fast charging mode (DC connection) and generate a current command value Idc* to control the fast charging of the battery 10 according to the determined charging mode.

[0207] In the third process for calculating the load command value (S242), the inverter device 50 integrated with a two-way OBC function can generate a load command value ddc* based on the current command value Idc*, the DC voltage Vdc, the DC power, and the DC current Idc between the motor 20 and the integrated inverter 100.

[0208] In addition, the inverter 50, which is equipped with a two-way OBC function, can generate the control signals Su, Sv and Sw for the main string and the auxiliary string control signal Saux in the third PWM modulation process (S243) based on the command value duax*.

[0209] Although representative embodiments of the present disclosure have been described in detail above, the person skilled in the art will understand that the embodiments described above can be modified in various ways without deviating from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiment, but should be determined by the claims described below and by claims equivalent to those claims.

Claims

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 that connects the auxiliary train unit or the DC power supply to the main train 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 power, or DC power 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 connection unit and the auxiliary string unit and between the connection unit and the auxiliary switch. Inverter device with integrated two-way OBC function according to claim 2, further comprising: 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 function mode, slow charge mode or fast charge mode. Inverter device with integrated two-way OBC function according to claim 3, wherein the controller comprises: a first controller configured to generate a main string control signal configured to control one of the high-side switches and one of the low-side switches of the main string unit, and to generate an auxiliary string control signal to control one of the high-side switches and one of the low-side switches of the auxiliary string unit according to the motor drive / V2L operating mode, the slow charge mode, or the fast charge mode; 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 linkage unit according to the motor drive / V2L operating mode, the slow charge mode, or the fast charge mode. Inverter device with integrated two-way OBC function according to claim 4, wherein the first control unit comprises: a first motor drive / V2L function mode controller 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 controller 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 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 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 into 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 string unit is connected to the main string unit and is controlled under the control of the controller in motor drive / V2L function mode; the connecting unit is switched on under the control of the controller in motor drive / V2L function mode; the main string 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 the motor drive / V2L function mode, which is to be supplied to the three-phase inductor of the motor, based on a DC voltage of the battery;and the auxiliary drive unit is configured to operate under the control of the second motor drive / V2L function mode control and generates an AC load current which is fed to the AC load connected to the linkage unit through an AC filter based on the DC voltage of the battery. Inverter device with integrated two-way OBC function according to claim 4, wherein the first control unit further comprises: a slow charge mode control configured to generate the control signal for the main string and the control signal for the auxiliary string based on a battery voltage command value and a battery voltage to perform slow charging of the battery in the slow charge mode in which the AC power supply is connected. Inverter device with integrated two-way OBC function according to claim 9, wherein the slow charge mode control comprises: a first unit for determining the charge mode and calculating the current command value, configured to determine a charge mode and generate a current command value for controlling the slow charging of the battery according to the determined charge mode based on the battery voltage command value, the battery voltage, and an input measurement voltage in the slow charge 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 generate the control signal for the main line and the control signal for the auxiliary line 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 further comprises: a fast charge mode control configured to generate the control signal for the main string and the control signal for the auxiliary string 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, 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-charging mode; the linking unit is switched on under the control of the controller in fast-charging 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-charging mode controller in fast-charging mode and generates a DC voltage to supply the battery with fast-charging 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 linking unit and is controlled by the fast-charging mode controller to provide a path for the charging current to flow to the DC load connected to the linking 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, as 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 connection 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 of outputting the auxiliary string control signal to the auxiliary string unit in the motor drive / V2L function mode;a control operation for the slow charging mode to control the auxiliary switch and the connection unit in the slow charging mode and to generate a main string control signal and an auxiliary string control signal based on the torque command value, the AC voltage and the AC current; and a fast charging mode control operation to control the auxiliary switch and the connection unit in the fast charging mode (DC connection) and to generate a main string control signal and an auxiliary string control signal based on the torque command value and the AC current. Control method for an inverter device incorporating a two-way OBC function according to claim 16, wherein the first motor drive / V2L function mode control operation further comprises: a current command value calculation operation for 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 for driving a motor in motor drive / V2L function mode; a voltage command value calculation operation for generating 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 for generating 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 incorporating 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 process for converting the voltage command value into a current command value based on an input measurement voltage; a first load command value calculation process for generating a load command value based on an input measurement current and the current command value; and a first PWM modulation process for generating the auxiliary string 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 charge mode further comprises: a first charge mode determination and current command value calculation process for determining a charge mode based on a battery voltage command value, a battery voltage and a measured voltage in the slow charge mode and for generating a current command value for controlling the slow charging of the battery according to the determined charge mode; a second load command value calculation process for generating 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 for generating 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 for determining a charge mode based on a battery voltage command value and a battery voltage in fast charge mode and for generating a current command value for controlling the fast charging of the battery according to the determined charge mode; a third load command value calculation process for generating 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 for generating the main string control signal and the auxiliary string control signal based on the operating command value.

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