On-vehicle charger control device and method for vehicle and system including the control device

Abstract

This invention relates to an on-board charger control device and method for vehicles, and a system including the control device. The on-board charger control device includes: a measuring device that measures the voltage of each phase of a three-phase OBC; and a controller that calculates the impedance of each phase using the voltage of each phase. The voltage is measured before charging begins in the three-phase OBC. The controller also calculates the amount of charge in each phase, which corresponds to the impedance of each phase, and adjusts the charging based on the calculated amount of charge in each phase.

Description

[0001] Cross-reference to related applications

[0002] This application claims the priority benefit of Korean Patent Application No. 10-2020-0053890, filed on May 6, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to an on-board charger (OBC) control device and method for vehicles, and a system including the control device, and more specifically, to a technique for resolving power imbalance in three-phase OBCs. Background Technology

[0004] Due to increased environmental regulations in North America and Europe, demand for environmentally friendly vehicles (such as plug-in hybrid electric vehicles (PHEVs) / electric vehicles (EVs) has risen, making PHEVs and EVs a focus of attention. One of the key consumer concerns regarding these environmentally friendly vehicles is the charging range for long-distance travel. This necessitates increasing the capacity of the high-voltage battery to extend the driving range. It is also necessary to consider increasing the capacity of the on-board charger (OBC) used to charge the high-voltage battery, along with increasing the capacity of the high-voltage battery itself, to maintain charging time at any level prior to the increase after the capacity increase.

[0005] However, increasing the capacity of an OBC by 2 to 4 times would lead to increased size and cost. Since increasing the capacity of an OBC using single-phase electricity would cause power imbalance, high-power OBCs currently under development utilize three-phase electricity to charge the battery. Specifically, for OBCs using three-phase electricity, the electricity of each phase should be balanced, and each phase should be controlled separately.

[0006] However, when control is applied to evenly supply power to each phase under conditions of power imbalance, the power imbalance can become more severe. Furthermore, when the power imbalance worsens, the three-phase transformer can become overloaded, and malfunctions in loads using three-phase power may occur. Specifically, when the three-phase OBC operates with an excessive single-phase load on one side, the phase imbalance becomes more severe because all three phases are expected to receive power equally. Summary of the Invention

[0007] The present invention provides an OBC control device and method for a vehicle, and a system including the control device, wherein the OBC control device is used to: when the three-phase power of the three-phase OBC is charged in an unbalanced state, to resolve the imbalance by calculating the three-phase imbalance degree and supplying the power consumed by each phase differently, thereby improving the safety of the power used.

[0008] The technical problems to be solved by the present invention are not limited to those described above, and any other technical problems not mentioned herein will be clearly understood by those skilled in the art from the following description.

[0009] According to one aspect of the invention, an OBC control device for a vehicle may include: a measuring device configured to measure the voltage of each phase of a three-phase OBC; and a controller configured to calculate the impedance of each phase using the voltage of each phase measured before the three-phase OBC begins charging, calculate the amount of charge of each phase corresponding to the impedance of each phase, and adjust the charging based on the calculated amount of charge of each phase.

[0010] In an exemplary embodiment, the controller may be configured to increase the current supplied to each phase after measuring the voltage of each phase before charging begins. Additionally, the controller may be configured to operate a measuring device to measure the voltage of each phase of the three-phase OBC after the current is increased, and may be configured to calculate a voltage drop value, which is the difference between the voltage of each phase measured before charging begins and the voltage of each phase measured after the current is increased.

[0011] The controller can be configured to calculate the phase difference between the voltage and current of each phase. Additionally, the controller can be configured to calculate the impedance of each phase of the three-phase OBC based on the voltage drop and the phase difference between voltage and current. The controller can also be configured to calculate the charge amount, which is inversely proportional to the impedance.

[0012] Furthermore, the controller can be configured to calculate the charge amount for each phase using the voltage and impedance of each phase measured before charging begins. The controller can also be configured to calculate the charge amount supplied to the first phase by subtracting the current obtained from evenly distributing the total supplied charge from the value obtained by dividing the voltage of the first phase measured before charging begins by the impedance of the first phase when the voltage of the first phase measured before charging begins is less than a predetermined reference value.

[0013] In an exemplary embodiment, the controller may be configured to calculate the amount of charge supplied to the second phase by adding the current obtained from evenly distributing the total supplied charge to the voltage of the second phase measured before charging begins, plus a value obtained by dividing the voltage of the second phase measured before charging begins by the impedance of the second phase, when the voltage of the second phase measured before charging begins is greater than a predetermined reference value. The controller may also be configured to set the median value of the three-phase voltage values ​​measured before charging begins as the reference value for calculating the amount of charge.

[0014] According to another aspect of the invention, a vehicle system may include a three-phase on-board charger (OBC) and an OBC control device, the OBC control device being configured to calculate the impedance of each phase using the voltage of each phase before the three-phase on-board charger begins charging, calculate the charge amount of each phase corresponding to the impedance of each phase, and adjust charging based on the calculated charge amount of each phase. According to another aspect of the invention, an operating method for an OBC for a vehicle may include: measuring the voltage of each phase of the three-phase OBC, calculating the impedance of each phase using the voltage of each phase, calculating the charge amount of each phase, the charge amount of each phase corresponding to the impedance of each phase, and adjusting charging based on the calculated charge amount of each phase.

[0015] In an exemplary embodiment, measuring the voltage may include: measuring the voltage of each phase before the three-phase OBC begins charging; and adjusting the magnitude of the current supplied to each phase based on the voltage imbalance of each phase before the three-phase OBC begins charging. Additionally, calculating the impedance of each phase may include increasing the current supplied to each phase. Calculating the impedance of each phase may further include: measuring the voltage of each phase of the three-phase OBC after increasing the current.

[0016] Furthermore, calculating the impedance of each phase may include calculating a voltage drop, which is the difference between the voltage of each phase measured before charging begins and the voltage of each phase measured after the current is increased. Calculating the impedance of each phase may further include calculating the phase difference between the voltage of each phase and the current of each phase.

[0017] In an exemplary embodiment, calculating the impedance of each phase may further include: calculating the impedance of each phase of the three-phase OBC based on the voltage drop value and the phase difference between the voltage and the current. Adjusting the charging may include calculating the charging amount, which is inversely proportional to the impedance. Attached Figure Description

[0018] The above and other objects, features, and advantages of the invention will become more clearly understood from the detailed description presented thereafter in conjunction with the accompanying drawings:

[0019] Figure 1 This is a block diagram illustrating the configuration of an OBC system for a vehicle according to an exemplary embodiment of the present invention;

[0020] Figure 2 This is a block diagram illustrating an example of connecting an electrical load for a vehicle's OBC system according to an exemplary embodiment of the present invention;

[0021] Figure 3 This is a block diagram illustrating the configuration of an OBC control device for a vehicle according to an exemplary embodiment of the present invention;

[0022] Figure 4It is a graph showing the voltage and current variations of a three-phase OBC for a vehicle according to an exemplary embodiment of the present invention;

[0023] Figure 5 This is a graph illustrating the phase difference between voltage and current in a three-phase OBC for a vehicle according to an exemplary embodiment of the present invention; and

[0024] Figure 6 This is a flowchart illustrating a control method for an OBC (On-Board Control) of a vehicle according to an exemplary embodiment of the present invention. Detailed Implementation

[0025] It should be understood that the term "vehicle" or "of a vehicle" or other similar terms as used herein generally includes motor vehicles, such as passenger cars including sport utility vehicles (SUVs), buses, trucks, and various commercial vehicles, vessels including various boats and ships, aircraft, etc., and includes hybrid vehicles, electric vehicles, hybrid electric vehicles, hydrogen-powered vehicles, and other vehicles powered by alternative fuels (e.g., fuels derived from non-petroleum energy sources). As mentioned herein, a hybrid vehicle is a vehicle with two or more power sources, such as both gasoline and electric power.

[0026] While the exemplary embodiments are described as utilizing multiple units to perform the exemplary processes, it should be understood that the exemplary processes may also be performed by one or more modules. Furthermore, it should be understood that the term controller / control unit refers to a hardware device including a memory and a processor, specifically programmed to perform the processes described herein. The memory is configured to store modules, and the processor is specifically configured to execute the modules to perform one or more processes described further below.

[0027] Furthermore, the control logic of the present invention can be implemented as a non-volatile computer-readable medium on a computer-readable medium, which contains executable program instructions that are executed by a processor, controller / control unit, etc. Examples of computer-readable media include, but are not limited to, ROM, RAM, optical disc (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer-readable recording medium can also be distributed across a network-connected computer system, such that the computer-readable medium is stored and executed in a distributed manner, for example, via a telematics server or controller area network (CAN).

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, values, steps, operations, elements, and / or components, but do not exclude the presence or inclusion of one or more other features, values, steps, operations, elements, components, and / or groups thereof. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0029] Unless otherwise stated or obvious from the context, the term "about" as used herein is understood to mean within the normal tolerance range in the field, such as within a mean of 2 standard deviations. "About" can be understood as within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of a specified value. Unless the context clearly indicates otherwise, all numerical values ​​provided herein are modified by the term "about".

[0030] The following description will detail some exemplary embodiments of the invention with reference to the accompanying drawings. When adding reference numerals to components in each figure, it should be noted that the same reference numerals designate components even when the same or equivalent components are shown in other figures. Furthermore, in describing embodiments of the invention, detailed descriptions of well-known features or functions will be omitted so as not to unnecessarily obscure the spirit of the invention.

[0031] In describing components according to embodiments of the present invention, terms such as first, second, "A", "B", (a), (b), etc., may be used. These terms are used only to distinguish one component from another, and they do not limit the nature, order, or sequence of the components. Unless otherwise defined, all terms used herein (including technical or scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning equivalent to that in the context of the relevant technical field, and should not be construed as having an ideal or overly formal meaning, unless expressly defined as such in this application.

[0032] The following will refer to the appendix. Figures 1 to 6 Exemplary embodiments of the present invention will be described in detail. Figure 1 This is a block diagram illustrating the configuration of a vehicle system including an on-board charger (OBC) control device for a vehicle according to an exemplary embodiment of the present invention. Figure 2This is a block diagram illustrating an example of connecting an electrical load for a vehicle's OBC system according to an exemplary embodiment of the present invention.

[0033] refer to Figure 1 and Figure 2 An OBC system for a vehicle according to an exemplary embodiment of the present invention may include: an OBC control device 100 for the vehicle, a three-phase OBC 200, and a three-phase transformer 300. The three-phase OBC 200 can be implemented as a three-phase circuit for high-capacity charging. Although in Figure 1 and Figure 2 Although not shown, the three-phase OBC 200 may include transformers, switching devices, etc., for each phase. Specifically, the three-phase OBC 200 can be connected in parallel for each phase, or it can be configured by connecting a three-phase power factor corrector (PFC) in parallel with three DC-DC converters. Here, the DC-DC converters can be connected in a single phase.

[0034] The three-phase transformer 300 can be configured to convert the power supplied from each phase of the three-phase OBC 200 and transmit the converted power to the high-voltage battery. Figure 1 The structure of a three-phase OBC 200 with each phase connected to an electrical load A, B, or C is disclosed. Figure 2 A structure for a three-phase OBC 200 is disclosed, in which each phase is connected to an additional single-phase load E, F or G and an electrical load D.

[0035] like Figure 2 As shown, single-phase loads E and F can be connected to the first phase of the three-phase system, single-phase load G can be connected to the second phase, and additional single-phase loads are not connected to the third phase. Specifically, power imbalance between phases may occur. Therefore, the OBC control device 100 for a vehicle according to an exemplary embodiment of the present invention can be configured to calculate the voltage difference between the three phases and can be configured to apply different amounts of power to each phase despite differences in the number or size of electrical loads connected to each phase, in order to control uniform power supply.

[0036] The OBC control device 100 for a vehicle according to an exemplary embodiment of the present invention can be implemented in a vehicle. Specifically, the OBC control device 100 can be integrated with the controller in the vehicle, or it can be implemented as a separate device to be connected to the vehicle controller via a separate connection device. When the three-phase power is being charged in an unbalanced state, the OBC control device 100 for the vehicle can be configured to calculate the degree of imbalance of each phase and can be configured to apply the power consumed by each phase differently, thereby preventing power imbalance.

[0037] Figure 3This is a block diagram illustrating the configuration of an OBC control device for a vehicle according to an exemplary embodiment of the present invention. The OBC control device 100 may include: a measuring device 110, a memory 120, and a controller 130. The measuring device 110 may be configured to measure the voltage of each phase of the three-phase OBC 200, the current of each phase, and the phase difference between the current and voltage, and may be configured to transmit the measured values ​​to the controller 130. Specifically, the measuring device 110 may include individual or integrated sensors to measure the voltage, current, and the phase difference between the current and voltage. The location of the voltage of each phase, the current of each phase, and the phase difference between the current and voltage may be... Figure 1 and 2 D1, D2, D3, D4, D5 or D6.

[0038] Memory 120 can be configured to store sensing results from measuring device 110 and data, algorithms, etc., required for the operation of controller 130. As an example, memory 120 can be configured to store voltage measurement results for each phase and values ​​calculated by controller 130. Memory 120 may include at least one type of storage medium, such as flash memory, hard disk memory, micromemory, card-type memory (e.g., a secure digital card (SD) or eXtreme digital card), random access memory (RAM), static RAM (SRAM), read-only memory (ROM), programmable ROM (PROM), electrically erasable PROM (EEPROM), magnetic RAM (MRAM), magnetic disk, and optical disk.

[0039] The controller 130 can be electrically connected to the measuring device 110, memory 120, etc., and can electrically control the various components. The controller 130 can be a circuit configured to execute software instructions and can be configured to perform various data processing and calculations described below. The controller 130 can be configured to process signals transmitted between the various components of the OBC controller 100 for a vehicle. The controller 130 can be, for example, an electronic control unit (ECU), a microcontroller unit (MCU), or another sub-controller installed in the vehicle. Specifically, the controller 130 can be configured to determine the impedance imbalance of each phase using a voltage drop value (the voltage drop value is the difference between the three-phase voltage measured before the three-phase OBC 200 begins charging and the three-phase voltage measured after the current supplied to the three phases is increased), can be configured to calculate the amount of charge in each phase corresponding to the impedance imbalance of each phase, and can be configured to adjust charging based on the calculated amount of charge in each phase.

[0040] Before charging begins, the controller 130 measures the voltage of each phase to calculate the voltage drop of each phase of the three-phase OBC 200. Then, the controller 130 can be configured to equally increase the current supplied to the three phases and measure the voltage of each phase to calculate the voltage drop. For example, when the three-phase voltages Va1, Vb1, and Vc1 are 210V, 220V, and 230V respectively, the voltage of phase a (e.g., the first phase) is 10V lower than the voltage of phase b (e.g., the second phase) based on the voltage of phase b (210V) (the intermediate value), and the voltage of phase c (e.g., the third phase) is 10V higher than the voltage of the second phase. Therefore, the controller 130 can be configured to determine that a 10V imbalance has occurred. The controller 130 can be configured to equally increase the current supplied to each phase, measure the three-phase voltages Va2, Vb2, and Vc2, and calculate the voltage drop as the value obtained by subtracting Va2, Vb2, and Vc2 from Va1, Vb1, and Vc1.

[0041] Figure 4 This is a graph illustrating the voltage and current variations of a three-phase OBC for a vehicle according to an exemplary embodiment of the present invention. Figure 4 As shown, the degree of voltage drop in each phase caused by an increase in the current supplied to each phase can be identified. In other words, when the current I1 increases to the current I2 after a certain period of time, the voltage V1 drops to the voltage V2, and V2-V1 can be the voltage drop value. At this time, the saturation current can be used as a reference current for measurement. Figure 3 The controller 130 can be configured to calculate the three-phase impedance using the voltage drop value based on the increase of the three-phase current and the phase difference between the three-phase voltage and the three-phase current.

[0042] Figure 5 This is a graph illustrating the phase difference between voltage and current in a three-phase OBC for a vehicle according to an exemplary embodiment of the present invention. Figure 5 As shown, Figure 3 The controller 130 can be configured to measure the time when each value of the voltage and current is "0" to obtain the time difference, and calculate the phase difference between the voltage and current. The controller 130 can utilize various general schemes to calculate the phase difference between the voltage and current.

[0043] After the current increases, the voltage of each phase is Va2, Vb2, or Vc2. Here, the voltage drop value based on the current increase is obtained by subtracting the voltage values ​​Va2, Vb2, and Vc2 after adjusting the supply current from the voltage values ​​Va1, Vb1, and Vc1 before charging begins. The controller 130 can be configured to calculate the impedance Za, Zb, or Zc of each phase using the voltage drop value and the phase difference (as shown in Equation 1 below), and determine the impedance imbalance of each phase, which is the difference between the impedance values ​​of the three phases.

[0044] Equation 1

[0045] Za=(Va1<0°-Va2<0°) / Ia<θ

[0046] Zb=(Vb1<0°-Vb2<0°) / Ib<θ

[0047] Zc=(Vc1<0°-Vc2<0°) / Ic<θ

[0048] The controller 130 can be configured to calculate the charge amount of each phase using the voltage and impedance of each phase measured before charging begins. Specifically, the charge amount Ca, Cb, or Cc of each phase can be calculated as shown in Equation 2 below.

[0049] Equation 2

[0050] Ca = (Iideal – Va / Za)

[0051] Cb = (Iideal + Vb / Zb)

[0052] Cc = (Iideal + Vc / Zc)

[0053] Specifically, "ideal" refers to the amount of current supplied evenly to each phase under ideal conditions. When the supplied power is 6.6 kW, 2.2 kW (=220V×10A) should be supplied to each phase, and the evenly supplied current is 10A. Each charge amount in Equation 2 above refers to the amount of current. Therefore, the controller 130 can be configured to calculate the charge amount inversely proportional to the magnitude of the three-phase impedance. As with Equation 2 above, the OBC control device 100 for the vehicle can be configured to calculate the charge amount of phase a as follows: this value is obtained by subtracting the value obtained by dividing the voltage (210V) of phase a by the impedance Za of phase a from the evenly distributed current (which is the current evenly supplied to each phase under ideal conditions), and can be configured to calculate the charge amount supplied to phase b or phase c.

[0054] In response to determining that the voltage of the first phase of the three phases, measured before charging begins, is less than a predetermined reference value, the controller 130 can be configured to calculate the amount of charge supplied to the first phase by subtracting the value obtained by dividing the voltage of the first phase by the impedance of the first phase from the current obtained by uniformly distributing the total supplied charge. In response to determining that the voltage of the second phase of the three phases, measured before charging begins, is greater than a predetermined reference value, the controller 130 can be configured to calculate the amount of charge supplied to the second phase by adding the value obtained by dividing the voltage of the second phase by the impedance of the second phase from the current obtained by uniformly distributing the total supplied charge.

[0055] The controller 130 can be configured to set the median value of the voltage measured before each phase begins charging as a reference value for calculating the amount of charge. In other words, it can be seen that the amount of charge in phases a and c can be calculated based on the voltage value of phase b in Equation 2 above. Therefore, the controller 130 can be configured to adjust the supplied current according to the amount of charge in each phase, thereby resolving voltage imbalance.

[0056] In the following text, reference will be made to Figure 6 The following describes in detail the operation method of the OBC for a vehicle according to an exemplary embodiment of the present invention. Figure 6 This is a flowchart illustrating a control method for an OBC (On-Board Control) for a vehicle according to an exemplary embodiment of the present invention. In the following, it may be assumed that... Figure 1 The OBC control unit 100 for the vehicle executes... Figure 6 The process. Furthermore, in Figure 6 In the description, the operation described as being performed by the device can be understood as being operated by the controller 130 of the OBC control device 100 for the vehicle.

[0057] refer to Figure 6 In S101, the device can be configured to measure the individual voltage of each phase of the three-phase OBC 200 before charging begins. Specifically, the device can be configured to... Figure 1 The individual voltage of each phase is measured at positions D1, D2, or D3. The voltage of each phase is Va1, Vb1, or Vc1. In S102, the device can be configured to determine the voltage imbalance of each phase using the difference between the measured three-phase voltages. When the three-phase voltages Va1, Vb1, and Vc1 are 210V, 220V, and 230V respectively, the voltage of the first phase is 10V lower than that of the second phase (based on the voltage of the second phase (210V) – the median value), and the voltage of the third phase is 10V higher than that of the second phase. Therefore, the device can be configured to determine that a 10V imbalance has occurred.

[0058] In S103, the device can be configured to measure the three-phase voltage when the current supplied to each phase of the OBC is increased equally. In S104, the device can be configured to calculate the voltage drop using the voltage of each phase measured after the current supplied to the OBC is increased and the voltage of each phase measured in S101, and can be configured to measure the phase difference between the voltage and the current.

[0059] For example, when the voltage of each phase after increasing the current supplied to the OBC is Va2, Vb2, or Vc2, the voltage drop of each phase after increasing the current supplied to the OBC can be obtained as follows: the voltage values ​​Va1, Vb1, and Vc1 before charging begins, minus the voltage values ​​Va2, Vb2, and Vc2 after adjusting the current supplied to the OBC. Specifically, the location used to measure the phase difference between voltage and current can be... Figure 1 D1, D2, or D3.

[0060] Furthermore, in S105, the device can be configured to calculate the impedance Za, Zb, or Zc of each phase using the voltage drop value of each phase and the phase difference between voltage and current, thereby calculating the impedance imbalance. Specifically, the impedance Za, Zb, or Zc of each phase can be calculated using Equation 1 above, and the impedance imbalance of each phase, which is the difference between the impedance values ​​of the three phases, can be calculated. In S106, the device can be configured to calculate the amount of charge to be supplied for charging using Equation 2 above, based on the three-phase voltage Va, Vb1, or Vc1 and the three-phase impedance Za, Zb, or Zc before charging begins. Specifically, the device can be configured to calculate the three-phase charge as a value inversely proportional to the three-phase impedance.

[0061] For example, assuming the voltage and impedance of phase a in a three-phase system are 210V and Za, the voltage and impedance of phase b are 220V and Zb, and the voltage and impedance of phase c are 230V and Zc, and charging is performed at a power of 6.6 kW, each phase should supply 2.2 kW (=220V×10A) when this power is evenly distributed among phases a, b, or c. However, when phase imbalance occurs, the device can be configured to calculate the amount of charge required for each phase to achieve power balance based on a predetermined reference value or intermediate value (e.g., 220V) of the three-phase voltage values ​​before each phase begins charging.

[0062] The device can be configured to calculate the charging amount of phase a by subtracting the value obtained by dividing the voltage (210V) of phase a by the impedance Za of phase a from the balanced current (which is the current supplied evenly to each phase under ideal conditions). It can also be configured to calculate the charging amount supplied to phase b or phase c. Specifically, the charging amount of the phase with lower voltage and higher impedance can be calculated as relatively lower. For example, when charging at a working power of 10kW, it can be allocated as 3kW for phase a, 4.5kW for phase b, and 2.5kW for phase c.

[0063] In S107, the device can be configured to provide different amounts of supplied current based on the calculated charge amount of each phase, thereby performing charging while resolving voltage imbalance. Therefore, exemplary embodiments of the present invention can improve the stability of the phase power in an OBC using three-phase electricity when there is phase power imbalance and can perform charging, thereby preventing damage to multiple components of the power supply (e.g., three-phase transformers, load banks, etc.) due to fire.

[0064] Therefore, the operation of the methods or algorithms described in conjunction with the embodiments disclosed herein can be directly implemented in hardware or software modules executed by the controller, or in combination thereof. The software modules can reside on storage media (i.e., memory and / or storage devices), such as RAM, flash memory, ROM memory, EPROM, EEPROM, registers, hard disks, removable hard disks, and CD-ROMs.

[0065] An exemplary storage medium can be coupled to a controller, and the controller can read information output from the storage medium and record the information in the storage medium. Alternatively, the storage medium can be integrated with the controller. The controller and storage medium can reside in an application-specific integrated circuit (ASIC). The ASIC can reside in the user terminal. In another scenario, the controller and storage medium can reside as separate components in the user terminal.

[0066] This technology improves the safety of the electricity used by calculating the three-phase imbalance when the three-phase power supply of a three-phase OBC is charged under unbalanced conditions, and then supplying different amounts of power to each phase to resolve the imbalance. Furthermore, various effects directly or indirectly determined by this invention can be provided.

[0067] In the foregoing, although the invention has been described with reference to exemplary embodiments and accompanying drawings, the invention is not limited thereto. Various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention as claimed by the appended claims.

[0068] Therefore, exemplary embodiments of the present invention are provided to explain the spirit and scope of the invention, but do not limit the spirit and scope of the invention, such that the spirit and scope of the invention are not limited by the exemplary embodiments. The scope of the invention should be interpreted based on the appended claims, and all technical concepts within the scope of the claims should be included within the scope of the invention.

Claims

1. An on-board charger control device for a vehicle, comprising: A measuring instrument configured to measure the voltage of each phase of a three-phase vehicle charger; as well as The controller is configured as follows: The impedance of each phase is calculated using the voltage of each phase, which is measured before the three-phase on-board charger begins charging. Calculate the charge amount of each phase, where the charge amount of each phase corresponds to the impedance of each phase; The charging is adjusted based on the calculated charging amount of each phase; In this configuration, at least one load is connected to each phase, and the voltage varies depending on at least one load.

2. The on-board charger control device for a vehicle according to claim 1, wherein, The controller is configured to measure the voltage of each phase before starting charging and then increase the current supplied to each phase.

3. The on-board charger control device for a vehicle according to claim 2, wherein, The controller is configured to operate the measuring device to measure the voltage of each phase of the three-phase vehicle charger after the current is increased.

4. The on-board charger control device for a vehicle according to claim 3, wherein, The controller is configured to calculate a voltage drop value, which is the difference between the voltage of each phase measured before charging begins and the voltage of each phase measured after the current is increased.

5. The on-board charger control device for a vehicle according to claim 4, wherein, The controller is configured to calculate the phase difference between the voltage and current of each phase.

6. The on-board charger control device for a vehicle according to claim 5, wherein, The controller is configured to calculate the impedance of each phase of the three-phase vehicle charger based on the voltage drop value and the phase difference between voltage and current.

7. The on-board charger control device for a vehicle according to claim 1, wherein, The controller is configured to calculate the amount of charge, which is inversely proportional to the impedance.

8. The on-board charger control device for a vehicle according to claim 7, wherein, The controller is configured to calculate the amount of charge in each phase using the voltage and impedance of each phase measured before charging begins.

9. The on-board charger control device for a vehicle according to claim 8, wherein, The controller is configured as follows: In response to determining that the voltage of the first phase of the three phases measured before charging begins is less than a predetermined reference value, the amount of charge supplied to the first phase is calculated by subtracting the value obtained by dividing the voltage of the first phase measured before charging begins by the impedance of the first phase from the current obtained by evenly distributing the total supplied charge.

10. The on-board charger control device for a vehicle according to claim 8, wherein, The controller is configured as follows: In response to determining that the voltage of the second phase of the three phases, measured before charging begins, is greater than a predetermined reference value, the current obtained by evenly distributing the total supplied charge is added to the value obtained by dividing the voltage of the second phase measured before charging begins by the impedance of the second phase, in order to calculate the amount of charge supplied to the second phase.

11. The on-board charger control device for a vehicle according to claim 9 or 10, wherein, The controller is configured to set the median value of the three-phase voltage measured before charging begins as a predetermined reference value for calculating the amount of charge.

12. A vehicle system comprising: Three-phase vehicle charger; as well as The on-board charger control device is configured to calculate the impedance of each phase using the voltage of each phase, calculate the charging amount of each phase, and adjust the charging based on the calculated charging amount of each phase. The voltage of each phase is measured before the three-phase on-board charger starts charging, and the charging amount of each phase corresponds to the impedance of each phase. In this configuration, at least one load is connected to each phase, and the voltage varies depending on at least one load.

13. A control method for an on-board charger for a vehicle, comprising: The control device measures the voltage of each phase of the three-phase vehicle charger; The control device calculates the impedance of each phase using the voltage of each phase; The control device calculates the charge amount of each phase and adjusts the charging based on the calculated charge amount of each phase, wherein the charge amount of each phase corresponds to the impedance of each phase. In this configuration, at least one load is connected to each phase, and the voltage varies depending on at least one load.

14. The control method according to claim 13, wherein, Measuring the voltage of each phase of a three-phase vehicle charger includes: Before the three-phase vehicle charger begins charging, the voltage of each phase is measured by the control device; Before the three-phase vehicle charger starts charging, the control device adjusts the current supplied to each phase according to the voltage imbalance of each phase.

15. The control method according to claim 14, wherein, The calculation of the impedance of each phase includes: The control device increases the current supplied to each phase.

16. The control method according to claim 15, wherein, The calculation of the impedance of each phase further includes: After the current is increased, the voltage of each phase of the three-phase vehicle charger is measured by the control device.

17. The control method according to claim 16, wherein, The calculation of the impedance of each phase further includes: The control device calculates the voltage drop value, which is the difference between the voltage of each phase measured before charging begins and the voltage of each phase measured after the current is increased.

18. The control method according to claim 17, wherein, The calculation of the impedance of each phase further includes: The control device calculates the phase difference between the voltage and current of each phase.

19. The control method according to claim 18, wherein, The calculation of the impedance of each phase further includes: The control device calculates the impedance of each phase of the three-phase vehicle charger based on the voltage drop value and the phase difference between the voltage and the current.

20. The control method according to claim 19, wherein, Adjustments to the charging process include: The charging amount is calculated by the control device, and the charging amount is inversely proportional to the impedance.

Images