Control method and device for multi-power bidirectional vehicle-mounted charger

Abstract

The invention provides a control method and device for a multi-power-supply bidirectional vehicle-mounted charger. The method includes measuring a first voltage of a first alternating current (AC) port connected to a first line of the three-phase AC input lines and measuring a second voltage of a second AC port connected to a second line of the three-phase AC input lines, and determining a phase angle of the first AC port based on a phase angle of the first voltage and a phase angle of the second voltage. A low frequency branch among the plurality of branches in the bidirectional OBC is controlled to be synchronized with the first AC port or the second AC port.

Description

Technical Field

[0001] The present disclosure relates to an on-vehicle charger (OBC) control method and apparatus for multiple power sources. Background Art

[0002] Generally, an electric vehicle obtains driving energy for a motor from a high-voltage battery and needs to be recharged via a bi-directional electric vehicle service equipment (EVSE) when the state of charge (SOC) of such a high-voltage battery becomes lower than a threshold.

[0003] The high-voltage battery provided in such an electric vehicle can operate as an energy storage system (ESS), and thus, the electric vehicle can be installed with a vehicle-to-grid (V2G) mode for supplying power of the high-voltage battery to the power grid (system power) and a vehicle-to-load (V2L) mode for supplying power of the high-voltage battery to various electronic devices (e.g., household appliances). In this case, the household appliances may include a laptop computer, a fan, a refrigerator, a washing machine, a TV, an electric heater, a rice cooker, a microwave oven, etc.

[0004] The electric vehicle should have a bi-directional OBC that operates in a charging mode, a V2G mode, or a V2L mode. As an embodiment of such a bi-directional OBC, Korean Patent Application Publication No. 10-2023-0015763 (Publication Date: January 31, 2023) titled “Apparatus for Controlling Bi-Directional On-Board Charger Of Electric Vehicle And Method Thereof” discloses a method of forming AC voltages having the same period and phase but different root mean square (RMS) values at two ports of the bi-directional OBC. Using this, a system for supplying power to multiple electronic devices by increasing the output of a single bi-directional OBC can be constructed.

[0005] However, in this technology, the two ports can only have the same period and phase, and when different loads (especially inductive loads and capacitive loads) are connected to each port, the phase difference of the current becomes significantly larger compared to the voltage formed by the OBC. In this case, there is a problem of current distortion occurring near the zero voltage of the V ac phase voltage.

[0006] Therefore, in this technical field, there is a need for an OBC control technology that minimizes current distortion caused by the phase difference of each phase when using two different alternating current (AC) input ports of a bi-directional OBC. Summary of the Invention

[0007] The present disclosure relates to an OBC control method and apparatus for multiple power sources. The specific implementation relates to an OBC control method and apparatus for multiple power sources, which minimize current distortion caused by the phase difference of loads when the V2L function is operated.

[0008] Embodiments of the present disclosure provide an OBC control technique that minimizes current distortion caused by the positional difference of each phase when using two different AC input ports of a bidirectional OBC.

[0009] A control method for a bidirectional OBC for an eco-friendly vehicle according to an exemplary embodiment of the present disclosure may include: measuring a first voltage of a first AC port connected to a first line among three-phase AC input lines, and measuring a second voltage of a second AC port connected to a second line among the three-phase AC input lines, and controlling a low-frequency branch among a plurality of branches provided in the bidirectional OBC to be synchronized with the first AC port or the second AC port based on the phase angle of the first voltage and the phase angle of the second voltage.

[0010] In this case, the bidirectional OBC may be provided with a three-phase bidirectional power factor corrector (PFC), wherein a first switch and a fourth switch form a first branch, a second switch and a fifth switch form a second branch, a third switch and a sixth switch form a third branch, the first line is connected to the first branch, the second line is connected to the second branch, and a third line different from the first line and the second line is connected to the third branch, and the low-frequency branch may be the third branch.

[0011] In this case, based on the phase angle of the first voltage and the phase angle of the second voltage, the switches of the third branch may be controlled to be synchronized with the switches of the first branch or the switches of the second branch.

[0012] In this case, when the phase angle of the first voltage is faster than the phase angle of the second voltage, the switches of the third branch may be controlled to be synchronized with the switches of the first branch.

[0013] In this case, when the phase angle of the second voltage is faster than the phase angle of the first voltage, the switches of the third branch may be controlled to be synchronized with the switches of the second branch.

[0014] In this case, the control method for controlling the bidirectional OBC may further include generating a first control signal for controlling the switches of the first branch and a second control signal for controlling the switches of the second branch.

[0015] In this case, the control method for controlling the bidirectional OBC may further include generating a third control signal for controlling the switches of the third branch based on the phase angle of the first voltage and the phase angle of the second voltage.

[0016] In this case, the control method for the bidirectional OBC may further include: generating first to third pulse width modulation (PWM) signals by modulating the pulse widths of the first to third control signals; and controlling the switches of the first to third branches based on the first to third PWM signals.

[0017] Meanwhile, the control device for the bidirectional OBC for an eco-friendly vehicle according to an exemplary embodiment of the present disclosure may include: a sensor unit that measures a first voltage using a voltage sensor connected to an electronic device connected to a first line among three-phase AC input lines, and measures a second voltage using a voltage sensor connected to an electronic device connected to a second line among the three-phase AC input lines; and a controller that controls a low-frequency branch among a plurality of branches provided in the bidirectional OBC to be synchronized with a first AC port or a second AC port based on a phase angle of the first voltage and a phase angle of the second voltage.

[0018] In this case, the bidirectional OBC may include a three-phase bidirectional PFC, where a first switch and a fourth switch form a first branch, a second switch and a fifth switch form a second branch, a third switch and a sixth switch form a third branch, the first line is connected to the first branch, the second line is connected to the second branch, a third line different from the first line and the second line is connected to the third branch, and the low-frequency branch may be the third branch.

[0019] In this case, based on the phase angle of the first voltage and the phase angle of the second voltage, the switches of the third branch may be controlled to be synchronized with the switches of the first branch or the switches of the second branch.

[0020] In this case, when the phase angle of the first voltage is faster than the phase angle of the second voltage, the switches of the third branch may be controlled to be synchronized with the switches of the first branch.

[0021] In this case, when the phase angle of the second voltage is faster than the phase angle of the first voltage, the switches of the third branch may be controlled to be synchronized with the switches of the second branch.

[0022] In this case, the controller may generate a first control signal for controlling the switches of the first branch and a second control signal for controlling the switches of the second branch.

[0023] In this case, the controller may generate a third control signal for controlling the switches of the third branch based on the phase angle of the first voltage and the phase angle of the second voltage.

[0024] In this case, the controller may generate first to third PWM signals by modulating the pulse widths of the first to third control signals, and may control the switches of the first to third branches based on the first to third PWM signals.

[0025] According to an embodiment of the present disclosure, when two different AC input ports of a bidirectional OBC are used, current distortion caused by the phase difference of each phase can be minimized.

[0026] In addition, current distortion caused by the phase difference of loads in a dual V2L operation can be minimized, thereby providing a stable power supply and improving power stability.

[0027] In addition, consumers can connect electrical devices to the AC input port without distinguishing between capacitive loads and inductive loads, thereby improving convenience.

[0028] In addition, no additional components are required to reduce current distortion caused by the phase difference of loads, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features, and other advantages of the embodiments of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings.

[0030] Figure 1 is a block diagram showing a schematic configuration of a bidirectional on-vehicle charger (OBC) control device for an eco-friendly vehicle according to an exemplary embodiment of the present disclosure.

[0031] Figure 2 is shown according to Figure 1 a circuit diagram of a bidirectional OBC control device for an eco-friendly vehicle according to an exemplary embodiment.

[0032] Figure 3 is shown as being provided in Figure 1 a diagram showing an example of the operation of a controller in a bidirectional OBC control device of an eco-friendly vehicle according to an exemplary embodiment.

[0033] Figures 4A to 4D is shown as specifying Figure 3 a control diagram of steps for generating an advanced current determination control signal during the operation of the controller.

[0034] Figure 5A and Figure 5B is a view showing an example of a graph comparing the difference in current distortion before and after applying a bidirectional OBC control device for an eco-friendly vehicle according to an exemplary embodiment of the present disclosure.

[0035] Figure 6 shows a bidirectional OBC control method for an eco-friendly vehicle according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] Hereinafter, exemplary embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings. Components that are the same or similar will be assigned the same reference numerals, and their repeated description will be omitted. The suffixes “module” and “section” of components used in the following description are given or used only for the ease of preparing the specification, and they do not have meanings or functions that distinguish each other. In addition, when it is determined that a detailed description of related known technologies for describing the exemplary embodiments disclosed in this specification may obscure the gist of the exemplary embodiments disclosed in this specification, the detailed description will be omitted. In addition, the drawings are only intended to facilitate the understanding of the exemplary embodiments disclosed in this specification, and the technical concepts disclosed in this specification are not limited by the drawings, and should be understood to include all changes, equivalents, or alternatives within the spirit and scope of this disclosure.

[0037] Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. These terms are only for the purpose of distinguishing one component from another.

[0038] When it is stated that a component is “connected” or “linked” to another component, it should be understood that the component may be directly connected or connected to other components, but another component may be present in the middle. On the other hand, when it is stated that a component is “directly connected” or “directly linked” to another component, it should be understood that no other component is present in the middle.

[0039] Unless the context clearly indicates otherwise, singular expressions include plural expressions.

[0040] In this specification, terms such as “include” or “has” are intended to stipulate the existence of features, quantities, steps, actions, components, parts, or combinations thereof described in this specification, and it should be understood that they do not exclude the existence or addition of one or more other features, quantities, steps, actions, components, parts, or combinations thereof.

[0041] Figure 1 is a block diagram showing a schematic configuration of a bidirectional on-vehicle charger (OBC) control device 100 for an eco-friendly vehicle according to an exemplary embodiment of the present disclosure.

[0042] See Figure 1 , the bidirectional OBC control device for an eco-friendly vehicle according to this exemplary embodiment may include a storage unit 10, a bidirectional OBC 20, an outdoor power socket 30, an indoor power socket 40, a high-voltage battery 50, and a controller 60.

[0043] In this case, each component may be combined with each other to form a single body, or some components may be omitted, depending on the method of implementing the bidirectional OBC control device according to the present exemplary embodiment.

[0044] Figure 2 is a circuit diagram of a bidirectional OBC control device 100 for an eco-friendly vehicle according to an exemplary embodiment of Figure 1 .

[0045] Hereinafter, components of the bidirectional OBC control device for an eco-friendly vehicle according to an exemplary embodiment of the present disclosure will be described in detail with reference to Figure 1 and Figure 2 .

[0046] The storage unit 10 may store various logics, algorithms, and programs required in the process of measuring the demand current of an electronic device connected to an outdoor power socket and an indoor power socket among three-phase AC input lines and controlling the bidirectional OBC based on the demand current.

[0047] The storage unit 10 may store the reference link voltage V link,ref , the reference voltage V ac1,dq,ref of the dq-transformed outdoor power socket 30, the reference voltage V ac1,dq,ref of the dq-transformed indoor power socket 40, the reference frequency f ac1,ref of the AC voltage supplied to the outdoor power socket 30, and the reference frequency f ac2,ref of the AC voltage supplied to the indoor power socket 40.

[0048] Here, the dq transformation may refer to transforming three phases into two phases, where one of the three phases is aligned with the x-axis (reference axis), and the remaining phases are transformed into two phases based on the axis aligned with the x-axis. When three phases are converted into two phases by the dq transformation as described above, control can be performed within a familiar two-dimensional orthogonal coordinate system, making control easier.

[0049] The storage unit 10 may include at least one storage medium among memory types such as flash type, hard disk type, micro type, and card type (SD card (Secure Digital card) or XD card (eXtreme Digital card)) and memory types such as random access memory (RAM), static RAM (SRAM), read only memory (ROM), programmable ROM (PROM), electrically erasable ROM (EEPROM), magnetic random access memory (MRAM), magnetic disk, and optical disk.

[0050] The bidirectional OBC 20 can not only charge the high-voltage battery 50 by converting alternating current into direct current, but also supply power to the power network system (or bidirectional EVSE) by converting the direct current of the high-voltage battery 50 into alternating current (the same voltage and frequency as commercial power).

[0051] The bidirectional OBC 20 may include a three-phase bidirectional PFC 210, a bidirectional DC / DC converter 220, a first voltage sensor 230, a second voltage sensor 240, an AC high-voltage connector 250, and an input filter 260. Here, the three-phase bidirectional PFC 210 may be a module for increasing energy efficiency, and may include a first current sensor 211 for measuring the inductor current of the L1 line, a second current sensor 212 for measuring the inductor current of the L2 line, and a third voltage sensor 213 for measuring the link voltage. At this time, the three-phase bidirectional PFC 210 may perform AC / DC power conversion, power factor correction, and reactive power minimization. The bidirectional DC / DC converter 220 may stably supply the power of the high-voltage battery 50 to the power network system, the outdoor power outlet 30, or the indoor power outlet 40, or it may stably supply the power supplied from the electric vehicle service equipment (EVSE) to the high-voltage battery 50. The first voltage sensor 230 may measure the voltage of the single-phase AC charging L1 line during single-phase charging. The second voltage sensor 240 may measure the voltage of the L2 line or the L3 line among the three-phase AC input lines. The AC high-voltage connector 250 may connect the vehicle charging port and the indoor power outlet 40 to the bidirectional OBC 20. The input filter 260 may remove the noise of the AC power supplied from the EVSE. The N line may refer to the N-phase (neutral conductor) line.

[0052] The outdoor power outlet 30 may be a module detachably attached to the charging port of the electric vehicle, and the outdoor power outlet 30 may be connected to an electronic device to transmit power when the high-voltage battery 50 is not being charged.

[0053] The indoor power outlet 40 may be located inside the electric vehicle, and it may transmit the power of the high-voltage battery 50 to the connected electronic device. In this case, the line L' supplying power to the indoor power outlet 40 may branch from the L2 line or the L3 line.

[0054] Meanwhile, the controller 60 may perform overall control to ensure that each of the above components properly performs its own function. Such a controller 60 may be implemented in the form of hardware, in the form of software, or in the form of a combination of hardware and software. Preferably, the controller 60 may be implemented as a microprocessor, but is not limited thereto.

[0055] Specifically, the controller 60 may measure a first voltage that is the voltage of an electronic device connected to the first line L1 among the three-phase AC input lines L1, L2, and L3, and a second voltage that is the voltage of an electronic device connected to the second line L2 among the three-phase AC input lines L1, L2, and L3, and the controller 60 may perform various controls during the process of controlling the bidirectional OBC based on the first voltage and the second voltage.

[0056] In this case, the controller 60 may control the bidirectional OBC based on the phase angles of the first voltage and the second voltage.

[0057] Meanwhile, as Figure 2 shown, the power to be supplied to the electronic device connected to the outdoor power outlet 30 may pass through the input filter 260 via line L1, and the power to be supplied to the electronic device connected to the indoor power outlet 40 may pass through the input filter 260 via line L2. At this time, the controller 60 may open the switches of line L1 and line L2 and may close the switch on line L2 between the AC high-voltage connector 250 and the input filter 260.

[0058] To supply power to the electronic device connected to the outdoor power outlet 30 and the electronic device connected to the indoor power outlet 40, the controller 60 may perform the operations shown in the following Figure 3 .

[0059] The controller 60 may control specific switches Q1 and Q4 of the three-phase bidirectional PFC 210 to supply power to the electronic device connected to the outdoor power outlet 30, and control specific switches Q2 and Q5 of the three-phase bidirectional PFC 210 to supply power to the electronic device connected to the indoor power outlet 40. Meanwhile, switches Q3 and Q6 may be used to determine the leading current.

[0060] Figure 3 shows an example of the operation of the controller provided in the bidirectional OBC control device of the eco-friendly vehicle according to the Figure 1 exemplary embodiment.

[0061] Referring to Figure 3 , the controller 60 may first extract the phase θ ac1,Sen from the L1 voltage V measured by the first voltage sensor 230 based on the phase-locked loop (PLL) ac1 to supply power to the electronic device connected to the outdoor power outlet 30 (S305).

[0062] In addition, the controller 60 may perform a dq transformation on both the inductor current I ac1,sen measured by the first current sensor 211 and the inductor current I ac2,sen measured by the second current sensor 212 to synchronize with the phase θ ac1 (S310).

[0063] At this time, in this specification, the dq-transformed current of the inductor current I ac1,sen is defined as the first current I ac1,dq,sen , and the inductor current I ac2,senThe dq-transformed current is defined as the second current I ac2,dq,sen .

[0064] In addition, the controller 60 can determine a first reference current I link,sen that causes the link voltage V measured in the third voltage sensor 213 to follow a reference voltage V link,ref with respect to the link voltage (S315). In this case, the first reference current is a dq-transformed reference current. ac1,dq,ref

[0065] In addition, the controller 60 can generate a d-axis first current control signal U ac1,dq,sen that causes the first current I to follow the first reference current I ac1,dq,ref and a q-axis first current control signal U d1 q1 (S320).

[0066] In addition, the controller 60 can perform a dq-to-ABC transformation on the d-axis first current control signal U ac1 d1 and the q-axis first current control signal U q1 A1 A1 ac2,sen ac1 ac2,sen (S325).

[0067] In addition, the controller 60 can generate a first PWM signal by performing PWM on the first control signal U A1 (S330), and can control the switches Q1 and Q4 of the three-phase bidirectional PFC 210 based on the first PWM signal (S335).

[0068] Meanwhile, in order to supply power to an electronic device connected to the indoor power outlet 40, the controller 60 can perform a dq transformation on the L2 voltage V measured by the second voltage sensor 240 in order to synchronize with the phase θ ac2,sen ac1 (S340). In this case, the dq-transformed L2 voltage V ac2,sen ac2,dq,sen ac2,dq,sen ac2,dq,ref ac2,dq,ref

[0069]

[0070] In addition, the controller 60 can determine a second reference current I ac2,dq,ref that causes the second voltage V to follow a dq-transformed reference voltage V of the indoor power outlet 40 stored in the storage unit 10 ac2,dq,ref (S340). In this case, the second reference current can be a dq-transformed reference current.

[0070] In addition, the controller 60 can determine a current I of the inductor measured by the second current sensor 212 ac2,senThe second current I after dq transformation ac2,dq,sen follows the second reference current I ac2,dq,ref The d-axis second current control signal U d2 and the q-axis second current control signal U q2 (S345).

[0071] In addition, the controller 60 can perform a dq-to-ABC transformation on the d-axis second current control signal U ac1 and the q-axis second current control signal U d2 in a state synchronized with the phase θ q2 to generate a second control signal U A2 (S350).

[0072] In addition, the controller 60 can generate a second PWM signal by performing PWM on the second control signal U A2 and can control the switches Q2 and Q5 of the three-phase bidirectional PFC 210 based on the second PWM signal (S360).

[0073] Meanwhile, the controller 60 can generate an advanced current determination signal based on the first control signal U A1 generated in step S325 and the second control signal U A2 generated in step S350, perform PWM on the advanced current determination signal to generate a third PWM signal (S370), and control the switches Q3 and Q6 of the three-phase bidirectional PFC 210 based on the third PWM signal (S375).

[0074] At this time, the advanced current determination signal can be a signal generated by selecting the control signal corresponding to the port with the faster phase among the first control signal U A1 and the second control signal U A2 .

[0075] In this case, when the phase θ ac1,sen of the L1 voltage V ac1 is faster than the phase θ ac2,sen of the L2 voltage V ac2 , the third PWM signal for controlling the switches Q3 and Q6 can be a signal synchronized with the first PWM signal for controlling the switches Q1 and Q4.

[0076] Conversely, when the phase θ ac2,sen of the L2 voltage V ac2 is faster than the phase θ ac1,sen of the L1 voltage V ac1 , the third PWM signal for controlling the switches Q3 and Q6 can be a signal synchronized with the second PWM signal for controlling the switches Q2 and Q5.

[0077] Figures 4A to 4D is a control diagram specifying the step of generating an advanced current determination control signal during the operation of a controller Figure 3 .

[0078] First, referring to Figure 4A , the controller 60 can generate a sampled and held signal U A2 by passing the second control signal U A2_old through a sample and hold circuit.

[0079] In this case, the sample and hold circuit can be a circuit that holds an input signal for a certain period of time, such that the sampled and held signal U A2_old can have the same value as the second control signal U A2 at any time in the past.

[0080] Furthermore, referring to Figure 4B , the controller 60 can input the second control signal U A2 into the (+) terminal of a comparator circuit and input the value "0" into the (-) terminal of the comparator circuit, thereby outputting a first comparison signal.

[0081] In addition, the controller 60 can input the value "0" into the (+) terminal of the comparator circuit and input the sampled and held signal U A2_old into the (-) terminal of the comparator circuit, thereby outputting a second comparison signal.

[0082] Furthermore, the controller 60 can input the first comparison signal and the second comparison signal into an AND gate and output a zero detection signal (Zero_Detect_signal) as the output signal.

[0083] In this case, when at least one of the second control signal U A2 and the sampled and held signal U A2_old has the value "0", the zero detection signal (Zero_Detect_signal) can have the value "0", and a non-zero value can be output only when both have values other than "0".

[0084] Therefore, the zero detection signal (Zero_Detect_signal) can detect the zero voltage rise section of the L2 voltage.

[0085] Furthermore, referring to Figure 4C , the controller 60 can input a first threshold value into the (+) terminal of the comparator circuit and input the first control signal U A1 into the (-) terminal of the comparator circuit, thereby outputting a third comparison signal.

[0086] In this case, the first threshold value can have various negative values and, for example, can have a value of "-0.005" as shown in Figure 4C Figure 278.

[0087] In this case, the controller 60 can input the zero detection signal (Zero_Detect_signal) and the third comparison signal into the AND gate, and then input the output signal into the S input terminal of the RS flip-flop.

[0088] In addition, the controller 60 can input the first control signal U A1 into the (+) terminal of the comparator circuit and input the second threshold value into the (-) terminal of the comparator circuit, thereby outputting the fourth comparison signal.

[0089] In this case, the second threshold value can have various positive values and, for example, can have a value of "0.005" as shown in Figure 4C Figure 285.

[0090] In this case, the controller 60 can input the zero detection signal (Zero_Detect_signal) and the fourth comparison signal into the AND gate, and then input the output signal into the R input terminal of the RS flip-flop.

[0091] In addition, the controller 60 can output a low-frequency leg control signal (Low_Frequency_Leg_Ctrl), which is the output signal of the Q output terminal of the RS flip-flop.

[0092] In this case, when the first comparison signal is less than the first threshold value at the moment when the zero detection signal (Zero_Detect_signal) occurs, the low-frequency leg control signal (Low_Frequency_Leg_Ctrl) can be set.

[0093] At the same time, when the first comparison signal is greater than the second threshold value at the moment when the zero detection signal (Zero_Detect_signal) occurs, the low-frequency leg control signal (Low_Frequency_Leg_Ctrl) can be reset.

[0094] That is, when the phase of the L1 voltage V ac1,sen is faster than the phase of the L2 voltage V ac2,sen , the low-frequency leg control signal (Low_Frequency_Leg_Ctrl) can have a value of "0", and when the phase of the L2 voltage V ac2,sen is faster than the phase of the L1 voltage V ac1,sen , the low-frequency leg control signal (Low_Frequency_Leg_Ctrl) can have a value of "1".

[0095] In addition, refer toFigure 4D The controller 60 can use the first control signal and the second control signal as input signals of a 2-to-1 multiplexer, and can use the Low_Frequency_Leg_Ctrl as a selection signal, so as to output the leading current determination control signal V a_positive as the output signal.

[0096] In this case, when the Low_Frequency_Leg_Ctrl has the value "0", the leading current determination control signal V a_positive can output the value of the first control signal U A1 , and when the Low_Frequency_Leg_Ctrl has the value "1", the leading current determination control signal V a_positive can output the value of the second control signal U A2 .

[0097] Figure 5A And Figure 5B shows an embodiment of a graph comparing the current distortion differences before and after applying the bidirectional OBC control device of an eco-friendly vehicle according to an exemplary embodiment of the present disclosure.

[0098] In Figure 5A and Figure 5B 's embodiment, the vehicle can perform dual V2L control to output a 220V voltage.

[0099] At this time, two V2L voltage ports can be connected to the vehicle, where the first port is connected to an inductive load with an apparent current of 16A and a phase of 60 degrees, and the second port is connected to a capacitive load with an apparent current of 16A and a phase of -60 degrees.

[0100] Figure 5A is a graph showing the voltage change measured by the voltage sensors of the loads connected to the first port and the second port, and Figure 5B is a graph showing the current change derived from the currents measured by the current sensors of the loads connected to the first port and the second port.

[0101] The time period 510 can show the voltage change of the loads connected to the first port and the second port in a conventional vehicle without applying the leading current determination control of the embodiment of the present disclosure, and the time period 530 can show the voltage change of the loads connected to the first port and the second port in a vehicle applying the leading current determination control of the embodiment of the present disclosure.

[0102] See Figure 5A, it can be seen that the voltages of the loads connected to the first port and the loads connected to the second port are almost identical to each other as a curve graph.

[0103] In addition, in Figure 5B , the time period 550 may show the current changes of the loads connected to the first port and the second port in a conventional vehicle to which the advanced current determination control of the embodiments of the present disclosure is not applied, and the time period 570 may show the current changes of the loads connected to the first port and the second port in a vehicle to which the advanced current determination control of the embodiments of the present disclosure is applied.

[0104] Referring to Figure 5B , compared with the load connected to the second port of a conventional vehicle, the current distortion of the load connected to the second port of a vehicle to which the advanced current determination control of the embodiments of the present disclosure is applied can be significantly improved.

[0105] Meanwhile, Table 1 below can compare the distortion (total harmonic distortion, THD) of the first port and the second port in a conventional vehicle in which the advanced current determination control according to the exemplary embodiments of the present disclosure is not performed and the distortion of the first port and the second port in a vehicle in which the advanced current determination control according to the exemplary embodiments of the present disclosure is performed.

[0106] Table 1

[0107]

[0108]

[0109] Referring to Table 1, it can be seen that compared with the current of the second port of a conventional vehicle, the current of the second port of a vehicle to which the advanced current determination control of the embodiments of the present disclosure is applied can have significantly improved current distortion. Figure 6 Illustrates a bidirectional OBC control method for an environmentally friendly vehicle according to an exemplary embodiment of the present disclosure.

[0110] It can be performed by Figure 1 the bidirectional OBC control device 100 of the environmentally friendly vehicle in

[0111] Referring to Figure 6 , the bidirectional OBC control device 100 may measure a first voltage from a voltage sensor of an electronic device connected to the first line L1 among the three-phase AC input lines L1, L2, and L3, and may measure a second voltage from a voltage sensor of an electronic device connected to the second line L2 among the three-phase AC input lines L1, L2, and L3 (S610).

[0112] In addition, the bidirectional OBC control device 100 may generate a first control signal for controlling the switches of the first branch and a second control signal for controlling the switches of the second branch (S630).

[0113] In this case, the bidirectional OBC control device 100 may be provided with a three-phase bidirectional PFC, where switches Q1 and Q4 form the first branch, switches Q2 and Q5 form the second branch, switches Q3 and Q6 form the third branch, the first line L1 is connected to the first branch, the second line L2 is connected to the second branch, and a third line L3 different from the first line L1 and the second line L2 is connected to the third branch.

[0114] In addition, the bidirectional OBC control device 100 may generate a third control signal for controlling the switches of the third branch based on the phase angle of the first voltage and the phase angle of the second voltage (S650).

[0115] In addition, the bidirectional OBC control device 100 may generate first to third PWM signals by modulating the pulse widths of the first to third control signals (S670).

[0116] In this case, based on the phase angle of the first voltage and the phase angle of the second voltage, the switches of the third branch may be controlled to be synchronized with the switches of the first branch or the switches of the second branch.

[0117] In this case, when the phase angle of the first voltage is faster than the phase angle of the second voltage, the switches of the third branch may be controlled to be synchronized with the switches of the first branch.

[0118] In this case, when the phase angle of the second voltage is faster than the phase angle of the first voltage, the switches of the third branch may be controlled to be synchronized with the switches of the second branch.

[0119] In addition, the bidirectional OBC control device 100 may control the switches of the first to third branches based on the first to third PWM signals (S690).

[0120] According to the exemplary embodiments of the present disclosure described so far, when using two different AC input ports of the bidirectional OBC, current distortion caused by the phase difference of each phase can be minimized.

[0121] In addition, current distortion caused by the phase difference of the loads in the dual V2L operation can be minimized, thereby providing a stable power supply and improving power stability.

[0122] In addition, consumers can connect electrical devices to the AC input port without distinguishing between capacitive loads or inductive loads, thereby improving convenience.

[0123] In addition, there is no need to add a separate additional component to reduce current distortion caused by the phase difference of the load, thereby reducing costs.

[0124] Meanwhile, the above-described embodiments of the present disclosure can be implemented as computer-readable code on a medium recording a program. The computer-readable medium may include all types of recording devices that store data readable by a computer system. Examples of the computer-readable medium may include a hard disk drive (HDD), a solid state drive (SSD), a silicon disk drive (SDD), a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like. Therefore, the above detailed description should not be construed as restrictive in all respects, but should be considered exemplary. The scope of the present disclosure should be determined by a reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present disclosure are included within the scope of the present disclosure.

Claims

1. A control method for a bidirectional on-board charger (OBC), the method comprising: measuring a first voltage of a first AC port connected to a first line of a three-phase alternating current (AC) input line, and measuring a second voltage of a second AC port connected to a second line of the three-phase AC input line; and A low-frequency branch among a plurality of branches in the bidirectional OBC is controlled to be synchronized with the first AC port or the second AC port based on a phase angle of the first voltage and a phase angle of the second voltage.

2. The control method according to claim 1, wherein: The bidirectional OBC includes a three-phase bidirectional power factor corrector; The first switch and the fourth switch define a first branch of the plurality of branches, the second switch and the fifth switch define a second branch of the plurality of branches, and the third switch and the sixth switch define a third branch of the plurality of branches; The first line is connected to the first branch, the second line is connected to the second branch, and a third line different from the first line and the second line is connected to the third branch; and The low-frequency branch is the third branch.

3. The control method according to claim 2, wherein: Based on the phase angle of the first voltage and the phase angle of the second voltage, the third switch and the sixth switch of the third branch are controlled to be synchronized with the first switch and the fourth switch of the first branch or synchronized with the second switch and the fifth switch of the second branch.

4. The control method according to claim 3, wherein: In a case where a phase angle of the first voltage is faster than a phase angle of the second voltage, the third switch and the sixth switch of the third branch are controlled to be synchronized with the first switch and the fourth switch of the first branch.

5. The control method according to claim 3, wherein: In a case where a phase angle of the second voltage is faster than a phase angle of the first voltage, the third switch and the sixth switch of the third branch are controlled to be synchronized with the second switch and the fifth switch of the second branch.

6. The control method according to claim 2, further comprising: A first control signal for controlling the first switch and the fourth switch of the first branch and a second control signal for controlling the second switch and the fifth switch of the second branch are generated.

7. The control method according to claim 6, further comprising: A third control signal for controlling the third switch and the sixth switch of the third branch is generated based on a phase angle of the first voltage and a phase angle of the second voltage.

8. The control method according to claim 7, further comprising: generating a first pulse width modulation (PWM) signal, a second PWM signal, and a third PWM signal by modulating the pulse widths of the first control signal, the second control signal, and the third control signal; and The first switch and the fourth switch of the first branch, the second switch and the fifth switch of the second branch, and the third switch and the sixth switch of the third branch are controlled based on the first PWM signal, the second PWM signal, and the third PWM signal.

9. A control device for a bidirectional on-board charger (OBC), the control device comprising: a sensor system configured to measure a first voltage using a first voltage sensor connected to a first electronic device connected to a first line of a three-phase alternating current (AC) input line and configured to measure a second voltage using a second voltage sensor connected to a second electronic device connected to a second line of the three-phase AC input line; as well as A controller is configured to control a low-frequency branch among a plurality of branches in the bidirectional OBC to be synchronized with a first AC port or a second AC port based on a phase angle of the first voltage and a phase angle of the second voltage.

10. The control device according to claim 9, wherein: The bidirectional OBC includes a three-phase bidirectional power factor corrector; The first switch and the fourth switch define a first branch of the plurality of branches, the second switch and the fifth switch define a second branch of the plurality of branches, and the third switch and the sixth switch define a third branch of the plurality of branches; The first line is connected to the first branch, the second line is connected to the second branch, and a third line different from the first line and the second line is connected to the third branch; and The low-frequency branch is the third branch.

11. The control device according to claim 10, wherein: The controller is configured to control the third switch and the sixth switch of the third branch to be synchronized with the first switch and the fourth switch of the first branch or with the second switch and the fifth switch of the second branch based on the phase angle of the first voltage and the phase angle of the second voltage.

12. The control device according to claim 11, wherein: The controller is configured to control the third switch and the sixth switch of the third branch to be synchronized with the first switch and the fourth switch of the first branch when a phase angle of the first voltage is faster than a phase angle of the second voltage.

13. The control device according to claim 11, wherein: The controller is configured to control the third switch and the sixth switch of the third branch to be synchronized with the second switch and the fifth switch of the second branch when a phase angle of the second voltage is faster than a phase angle of the first voltage.

14. A control device for a bidirectional on-board charger (OBC), the bidirectional OBC comprising a three-phase bidirectional power factor corrector, the control device comprising: a sensor system configured to measure a first voltage using a first voltage sensor connected to a first electronic device connected to a first line of a three-phase alternating current (AC) input line and configured to measure a second voltage using a second voltage sensor connected to a second electronic device connected to a second line of the three-phase AC input line; as well as The controller is configured as: controlling a low-frequency branch among a plurality of branches in the bidirectional OBC to be synchronized with a first AC port or a second AC port based on a phase angle of the first voltage and a phase angle of the second voltage, wherein a first switch and a fourth switch define a first branch among the plurality of branches, a second switch and a fifth switch define a second branch among the plurality of branches, and a third switch and a sixth switch define a third branch among the plurality of branches, wherein the first line is connected to the first branch, the second line is connected to the second branch, and a third line different from the first line and the second line is connected to the third branch, and wherein the low-frequency branch is the third branch; and A first control signal for controlling the first switch and the fourth switch of the first branch and a second control signal for controlling the second switch and the fifth switch of the second branch are generated.

15. The control device according to claim 14, wherein: The controller is configured to generate a third control signal for controlling the third switch and the sixth switch of the third branch based on a phase angle of the first voltage and a phase angle of the second voltage.

16. The control device according to claim 15, wherein: The controller is configured to: generating a first pulse width modulation (PWM) signal, a second PWM signal, and a third PWM signal by modulating the pulse widths of the first control signal, the second control signal, and the third control signal; and The first switch and the fourth switch of the first branch, the second switch and the fifth switch of the second branch, and the third switch and the sixth switch of the third branch are controlled based on the first PWM signal, the second PWM signal, and the third PWM signal.

17. The control device according to claim 14, wherein: The controller is configured to control the third switch and the sixth switch of the third branch to be synchronized with the first switch and the fourth switch of the first branch or with the second switch and the fifth switch of the second branch based on the phase angle of the first voltage and the phase angle of the second voltage.

18. The control device according to claim 17, wherein: The controller is configured to control the third switch and the sixth switch of the third branch to be synchronized with the first switch and the fourth switch of the first branch when a phase angle of the first voltage is faster than a phase angle of the second voltage.

19. The control device according to claim 17, wherein: The controller is configured to control the third switch and the sixth switch of the third branch to be synchronized with the second switch and the fifth switch of the second branch when a phase angle of the second voltage is faster than a phase angle of the first voltage.

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