Battery to Vehicle Charging System

Abstract

A battery-to-vehicle charging system, comprising: a vehicle including an on-vehicle charger, a first battery, and a first controller, the on-vehicle charger including a power factor correction circuit having a boost converter circuit, the first battery being charged by a charging voltage output from the on-vehicle charger, the first controller controlling the charging process based on the type of charging power source provided from the outside; and a mobile energy storage device including a second battery for storing DC charging power supplied to the first battery, and a second controller for providing a determination signal of the charging power source type to the first controller, wherein when the first controller receives the determination signal from the second controller and the charging power source is determined to be the mobile energy storage device, the first controller controls the power factor correction circuit to operate as a boost converter.

Description

Technical Field

[0001] The present disclosure relates to a battery-to-vehicle charging system, and more particularly to a battery-to-vehicle charging system that can charge a battery in a vehicle by supplying DC power from a battery of an external charging device to the vehicle even without a separate power conversion device in the external charging device. Background Art

[0002] A mobile charging system is a system for more conveniently solving the problem of insufficient battery power for a user of an electric vehicle and charging the battery. The mobile charging system includes a battery as an energy storage device for storing electric energy and a power conversion device for converting the energy stored in the battery into a rate of power required by the vehicle.

[0003] Since such a mobile charging system of the prior art includes not only a battery for storing electric energy but also a power conversion device having a large volume and weight, the overall size and weight are large. Therefore, there is a problem of low convenience of mobility or portability, and thus the mobile charging system can only be operated in the type of a dedicated charging service vehicle.

[0004] The description of the prior art provided above as the background of the present disclosure is only for helping to understand the background of the present disclosure and should not be construed as including in the prior art known to those skilled in the art. Summary of the Invention

[0005] One aspect of the present disclosure is to provide a battery-to-vehicle charging system that can charge a battery in a vehicle by supplying DC power directly provided by a battery of an external charging device without a separate power conversion device to a battery provided in the vehicle.

[0006] According to an aspect of the present disclosure, a battery-to-vehicle charging system includes: a vehicle including an in-vehicle charger having a boost converter circuit, a first battery charged by a charging voltage output from the in-vehicle charger, and a first controller for controlling a charging process based on a type of a charging power source provided from the outside; and an energy storage device including a second battery for storing DC (direct current) charging power supplied to the first battery, and a second controller for providing a determination signal of the type of the charging power source to the first controller, wherein when the first controller receives the determination signal from the second controller and the charging power source is determined to be the energy storage device, the first controller controls the boost converter circuit to operate.

[0007] According to an exemplary embodiment of the present disclosure, the energy storage device may not include a power conversion device for converting the voltage of the second battery into a voltage having a magnitude capable of charging the first battery.

[0008] According to an exemplary embodiment of the present disclosure, when the charging power source is determined as an energy storage device through a determination signal, the first controller applies the charging power supplied from the energy storage device to the input terminal of the boost converter circuit.

[0009] According to an exemplary embodiment of the present disclosure, when the first controller receives a determination signal in power line communication from the second controller through a control pilot line and the charging power source is determined as an energy storage device, the first controller may apply the charging power supplied from the energy storage device to the input terminal of the boost converter circuit.

[0010] According to an exemplary embodiment of the present disclosure, the boost converter circuit may have a boost converter topology including an inductor, a diode, and a switching device, and when the first controller determines the charging power source as an energy storage device, the duty ratio of the switching device may be determined based on the ratio of the voltage of the second battery to the target voltage at the output terminal of the boost converter circuit.

[0011] According to an exemplary embodiment of the present disclosure, the on-vehicle charger may further include a DC converter that converts the magnitude of the output voltage of the boost converter circuit into a predetermined magnitude of the charging voltage.

[0012] According to another aspect of the present disclosure, a battery-to-vehicle charging system includes: a charging port having a plurality of terminals to which a connector of an external charging power source is coupled, charging power being applied from the connector to the terminals and a control signal for charging being provided to the terminals; an on-vehicle charger including a power factor correction circuit having an input terminal connected to an AC (alternating current) power input terminal of the charging port and having a boost converter topology; a battery charged by a charging voltage output from the on-vehicle charger; and a controller that determines the type of the charging power source based on a control signal input from the external charging power source through the terminals of the charging port and controls the charging process based on the determined type of the charging power source, wherein when the determined charging power source is determined as a charging power source that supplies DC power having a voltage lower than the battery voltage to the AC power input terminal, the controller controls the power factor correction circuit to operate as a boost converter.

[0013] According to an exemplary embodiment of the present disclosure, the controller may determine the type of the charging power source based on a control signal input through the control pilot line, the control pilot line being formed by coupling the connector to the charging port.

[0014] According to an exemplary embodiment of the present disclosure, the controller may receive a control signal in power line communication through the control pilot line formed by coupling the connector to the charging port.

[0015] According to an exemplary embodiment of the present disclosure, when the determined charging power source is determined to be a charging power source that provides a voltage higher than the DC power of the battery to the DC power input terminal of the charging port, the controller electrically connects the DC power input terminal to the battery without operating the on-vehicle charger.

[0016] According to an exemplary embodiment of the present disclosure, the power factor correction circuit has a boost converter topology including an inductor, a diode, and a switching device, and when the determined charging power source is determined to be a charging power source that provides DC power with a voltage lower than the battery voltage to the AC power input terminal, the controller may determine the duty ratio of the switching device based on the ratio of the voltage of the charging power source to the target voltage at the output terminal of the power factor correction circuit.

[0017] According to an exemplary embodiment of the present disclosure, the power factor correction circuit may have a boost converter topology including an inductor, a diode, and a switching device, and when the determined charging power source is a charging power source that provides AC power to the AC power input terminal, the controller may determine the duty ratio of the switching device by performing voltage control and current control so that the voltage of the power factor correction circuit becomes the target voltage.

[0018] The battery-to-vehicle charging system according to the above exemplary embodiment can charge the high-voltage battery in the vehicle from the low-voltage battery using a charging connector used in the prior art. In particular, even if there is no separate power conversion device for boosting in the external energy storage device with a low-voltage battery, the voltage of the low-voltage battery can be boosted by using the power factor correction circuit of the OBC installed in the vehicle, and then the voltage can be applied to the battery in the vehicle to perform charging.

[0019] Therefore, the size and weight of the mobile energy storage device for charging the battery in the vehicle can be reduced, the price of the energy storage device can be lowered, and the utilization rate of the mobile energy storage device can be improved.

[0020] The effects of the present disclosure are not limited to the above effects, and those skilled in the art can clearly understand other effects from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other aspects, features, and advantages of the present disclosure will become more apparent from the following detailed description in conjunction with the accompanying drawings, in which:

[0022] Figure 1 is a block diagram showing the configuration of a battery-to-vehicle charging system according to an exemplary embodiment of the present disclosure;

[0023] Figure 2 is a flowchart showing a charging control method performed by a controller of a vehicle in a battery-to-vehicle charging system according to an exemplary embodiment of the present disclosure;

[0024] Figure 3 is a diagram showing a circuit configuration and waveforms when external AC power is supplied from a battery-to-vehicle charging system to an on-vehicle charger according to an exemplary embodiment of the present disclosure; and

[0025] Figure 4 is a diagram showing a circuit configuration and waveforms when external DC power is supplied from a battery-to-vehicle charging system to an on-vehicle charger according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0026] Hereinafter, a battery-to-vehicle charging system according to an exemplary embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0027] In the following description, the battery-to-vehicle charging system may be referred to as a B2V (battery-to-vehicle) charging system, which is generally used as an abbreviation in the art.

[0028] Figure 1 is a block diagram showing a configuration of a battery-to-vehicle charging system according to an exemplary embodiment of the present disclosure.

[0029] Reference Figure 1 , a B2V charging system according to an exemplary embodiment of the present disclosure may include a vehicle 20 having a battery 25 as a charging target and an energy storage device 10, the energy storage device 10 being of a type of a mobile charging device having another battery 11 that stores energy for supplying DC charging power to the battery 25 from outside the vehicle 20.

[0030] The energy storage device 10 may include a battery 11 that stores charging energy, a controller 13 that performs necessary control when the energy stored in the battery 11 is supplied to the vehicle, and a charging connector 15 connected to a charging port 21 of the vehicle.

[0031] The controller 13 of the energy storage device 10 according to an exemplary embodiment of the present disclosure may be a processor (e.g., a computer, a microprocessor, a CPU, an ASIC, a circuit, a logic circuit, etc.). The controller 13 may be implemented by a non-transitory memory that stores, for example, (one or more) programs, software instruction reproduction algorithms, etc. and a processor configured to execute (one or more) programs, software instruction reproduction algorithms, etc., and the controller 13 controls the operation of the energy storage device 10 when executed. Here, the memory and the processor may be implemented as separate semiconductor circuits. Alternatively, the memory and the processor may be implemented as a single integrated semiconductor circuit. The processor may be embodied as one or more processors.

[0032] The energy storage device 10 generally refers to a fixed energy storage device and a mobile energy storage device, and may be a device that supplies energy without having or using a separate power conversion device.

[0033] The battery 11 may be a component that stores electrical energy for charging the battery 25 in a vehicle. Generally, the battery 11 included in the energy storage device 10 may have limitations on the capacity of the energy that can be stored and the output voltage. Recently, as the battery 25 that supplies energy to drive the vehicle in the vehicle, a battery with a high output voltage (e.g., approximately 800V) has been introduced, but it is difficult for the battery 11 included in the energy storage device 10 to output a voltage as high as that of the battery 25 in the vehicle.

[0034] Therefore, in the prior art, a power conversion circuit for increasing the voltage of the battery 11 is provided in the energy storage device, and a method of supplying voltage to the battery 25 in the vehicle through a DC charging pin after increasing the voltage of the battery 25 has been used. However, according to this method of the prior art, since the energy storage device has a power conversion circuit for boosting, it is a problem for reducing the size of the energy storage device, and the price of the energy storage device may increase. Various exemplary embodiments of the present disclosure provide a technology that can charge the battery in the vehicle by supplying the energy stored in the battery of the energy storage device to a battery in the vehicle having a higher voltage than the battery of the energy storage device without a power conversion circuit in the energy storage device.

[0035] According to an exemplary embodiment of the present disclosure, when the energy storage device 10 is connected to the vehicle 20 for charging, the controller 13 of the energy storage device 10 may provide a signal for identifying a charging power source to the controller 27 in the vehicle 20. For example, the controller 13 may use a control pilot (CP) signal to provide a signal for confirming that the charging power source is the battery 11 to the controller 27 in the vehicle 20. The CP signal may be provided through a CP pin (e.g., pin 4 of the charging connector 15) of the charging connector 15 connected to the charging port 21 of the vehicle.

[0036] The charging connector 15 may be a component that provides a control signal and charging power for charging the vehicle 20 by being connected to the charging port 21 of the vehicle. The charging connector 15 may be a Society of Automotive Engineers (SAE) J1772 connector. Figure 1 The illustrated charging connector 15 is an SAE J1772 combined connector that can be shared for AC charging power and DC charging power of the SAE J1772 connector. That is, the SAE J1772 combined connector is a standard connector designed for two charging modes, which are slow charging that supplies AC power to the vehicle and fast charging that supplies DC power to the vehicle.

[0037] The SAE J1772 combined connector includes AC output pins (e.g., pin 1 and pin 2) for providing AC charging power in a slow charging manner, a ground pin (e.g., pin 3), a CP pin (e.g., pin 4) to which a CP signal is provided, a proximity detection (PD) pin (e.g., pin 5) for determining the connection state of the connector, and a DC plus (+) pin (e.g., pin 6) and a DC minus (-) pin (e.g., pin 7) for providing DC charging power in a fast charging manner. When the voltage of the DC charging power supplied from the charging device or the energy storage device to the vehicle is a voltage capable of charging the battery 25 as the charging target, the 6th pin and the 7th pin for providing DC charging power can be used, and the DC charging power can be directly applied to the battery 25 without a conversion process.

[0038] In the charging system according to an exemplary embodiment of the present disclosure, the energy storage device 10 may be configured to transmit the DC power of the battery 11 using the 1st pin and the 2nd pin of the charging connector 15 (i.e., the pins provided to supply AC power in a slow charging manner). In other words, in the energy storage device 10, the two terminals (e.g., the positive terminal and the negative terminal) of the battery 11 may be directly connected to the 1st pin and the 2nd pin of the charging connector 15, respectively. The 1st pin and the 2nd pin of the charging connector 15 may be connected to the input end of the on-vehicle charger 23 of the vehicle 20 through the charging port 21 of the vehicle 20.

[0039] The vehicle 20 may include: a charging port 21 to which the charging connector 15 of the energy storage device 10 is coupled; an on-vehicle charger (OBC) 23 that generates a charging voltage for charging the battery 25 by receiving external charging power from the 1st terminal and the 2nd terminal of the charging port 21 and transmits the charging voltage to the battery 25; and a controller 27 that determines the type of the charging power source, determines whether the charging connector 15 has been connected, and controls the operation of the OBC 23 in response to the CP signal and the PD signal from the 4th terminal and the 5th terminal of the charging port 21.

[0040] The charging port 21 may be a component exposed to the outside of the vehicle, and the charging connector 15 is inserted into this component for connection, and the charging port 21 may have terminals respectively connected to the pins of the charging connector 15. For example, the first terminal and the second terminal may be connected to the first pin and the second pin of the charging connector 15 respectively, whereby AC charging power may be input in a normal slow charging manner. The first terminal and the second terminal may be connected to the input terminal of the OBC. In addition, the third terminal of the charging port 21 may provide chassis ground by connecting to the third pin of the charging connector 15, the fourth terminal may provide a CP signal to the controller 27 by connecting to the fourth pin of the charging connector 15, and the fifth terminal may provide a PD signal to the controller 27 by connecting to the fifth pin of the charging connector 15. In addition, the sixth terminal and the seventh terminal of the charging port 21 may be connected to the sixth pin and the seventh pin of the charging connector 15 respectively, whereby the DC power supplied to the sixth pin and the seventh pin may be directly supplied to the battery 25.

[0041] The input terminal of the OBC 23 may be connected to the first terminal and the second terminal of the charging port 21. Generally, the OBC 23 receives AC power from an external charging device, converts the AC power into DC power having a voltage capable of charging the battery 25, and supplies the DC power to the battery 25. In an exemplary embodiment of the present disclosure, the OBC 23 may receive DC power from the battery 11 through the first terminal and the second terminal of the charging port 21. The battery 11 supplies DC power in the external energy storage device 10, converts the DC power into a voltage level of a desired magnitude and supplies the converted power to the battery 25.

[0042] The OBC 23 may include a power factor correction circuit 231 and a DC-DC converter 233. The power factor correction circuit 231 is implemented as a boost converter topology, and the DC-DC converter 233 converts the output of the power factor correction circuit 231 into a voltage having a magnitude suitable for charging the battery 25 and supplies the voltage to the battery 25.

[0043] The battery 25 may be a component that stores energy to drive a motor (not shown) that provides torque to the wheels of the vehicle 20, may have a high voltage output (e.g., about 400V or higher), and may be charged by the DC charging power supplied from the OBC 23.

[0044] When a connector for providing charging power from an external charging device or an energy storage device is connected to the charging port 21, the controller 27 may sense it, identify the power source providing the charging power based on the signal provided by the connector, and appropriately control the OBC 23 accordingly.

[0045] The controller 27 can be understood as a concept including all kinds of controllers typically arranged in a vehicle in relation to charge control. For example, a charge management system (CMS), a battery management system (BMS), and an OBC controller.

[0046] The controller 27 of a vehicle according to an exemplary embodiment of the present disclosure may be a processor (e.g., a computer, a microprocessor, a CPU, an ASIC, a circuit, a logic circuit, etc.). The controller 27 may be implemented by a non-transitory memory storing, for example, (one or more) programs, software instruction reproduction algorithms, etc., and a processor configured to execute (one or more) programs, software instruction reproduction algorithms, etc. The controller 27 controls the operation of various components of the vehicle when executed. Here, the memory and the processor may be implemented as separate semiconductor circuits. Alternatively, the memory and the processor may be implemented as a single integrated semiconductor circuit. The processor may be embodied as one or more processors.

[0047] Hereinafter, operations performed by the controller 27 of a charging system according to various exemplary embodiments of the present disclosure will be described in more detail.

[0048] Figure 2 is a flowchart showing a charge control method performed by a controller of a vehicle in a battery-to-vehicle charging system according to an exemplary embodiment of the present disclosure. Figure 3 is a diagram showing a circuit configuration and waveforms when external AC power is provided to an on-vehicle charger from a battery-to-vehicle charging system according to an exemplary embodiment of the present disclosure, Figure 4 is a diagram showing a circuit configuration and waveforms when external DC power is provided to an on-vehicle charger from a battery-to-vehicle charging system according to an exemplary embodiment of the present disclosure.

[0049] When a charging connector 15 is connected to a charging port 21 of a vehicle 20 (S11), the controller 27 may be provided with various control signals from an external charging device (S12).

[0050] For example, when SAE J1772 is coupled to the charging port 21 in step S12, the controller 27 may receive a CP signal transmitted through a CP line formed by connecting a pin 4 of the charging connector 15 to a terminal 4 of the charging port 21, or a signal capable of finding a charging mode through power line communication (PLC). The charging mode refers to a control mode determined by finding out what type of charging power source provides charging power to the vehicle from the outside to charge the battery 25.

[0051] Next, the controller 27 may identify the type of power source providing charging power to the battery 25, and determine the charging mode by identifying the received signal (S13).

[0052] For example, in step S13, when the CP signal received through the CP line is only a 1 kHz square wave with a duty ratio of 10 to 97%, the controller 27 can determine that the external charging power supply is a charging device that provides AC power to the OBC 23. When a power line communication signal is received through the CP line with a CP signal having a square wave of approximately 5% as a carrier, the controller 27 can identify the information of the power line communication signal to find out whether a power supply that provides low-voltage DC power to the OBC 23 through the No. 1 terminal and the No. 2 terminal of the charging port 21 is connected, or whether a charging device that directly provides high-voltage DC power to the battery 25 through the No. 6 terminal and the No. 7 terminal is connected. When charging is performed by a conventional DC charging device and when the charging power is determined to be DC through communication using the power line communication signal between the controller 27 and the charging device, the controller 27 deactivates the line connected to the No. 1 terminal and the No. 2 terminal of the charging connector 15 and activates the line connected to the No. 6 terminal and the No. 7 terminal. According to an exemplary embodiment of the present disclosure, since DC power must be received through the No. 1 terminal and the No. 2 terminal and the existing AC charging power is input through the No. 1 terminal and the No. 2 terminal, a determination signal from the controller 13 of the energy storage device 10 through power line communication can be received and analyzed, and then the line connected to the No. 1 terminal and the No. 2 terminal is activated, and the line connected to the No. 6 terminal and the No. 7 terminal is deactivated.

[0053] As another example, in a conventional DC charging device, when communication is performed between the controller 27 and the charging device using a power line communication signal, when it is determined that the charging power is DC and the line of the controller 27 connected to the No. 6 terminal and the No. 7 terminal is activated and then no power is supplied to the No. 6 terminal and the No. 7 terminal, it is determined to be a failure. However, according to an exemplary embodiment of the present disclosure, since DC power must be input through the No. 1 terminal and the No. 2 terminal where the existing AC charging power is input,

[0054] when no power is supplied through the line connected to the activated No. 6 terminal and the No. 7 terminal, the controller 27 activates the line connected to the No. 1 terminal and the No. 2 terminal that is not determined to be faulty, so that external DC power can be received through the OBC 23 and the battery can be charged.

[0055] The PLC communication through the CP line can be a standard defined by SAE, which will not be described in detail here.

[0056] Next, the controller 27 can perform appropriate control for each charging mode determined according to the result of identifying the power supply type that provides charging power to the battery 25.

[0057] First, when the controller 27 determines that the external charging power source is a charging device that provides high-voltage DC power capable of charging the battery 25, the controller can electrically connect the 6th terminal and the 7th terminal of the charging port 21 to the battery 25, so that the high-voltage DC power provided to the 6th terminal and the 7th terminal of the charging connector 15 is directly provided to the battery 25 (S14). The electrical connection between the 6th terminal and the 7th terminal of the charging port 21 and the battery 25 can be achieved by short-circuiting a switching device such as a relay provided therebetween. In this case, the controller 27 does not operate the OBC 23, and when an appropriate device for electrical connection / disconnection is provided, the electrical connection between the battery 25 and the OBC 23 can be cut off.

[0058] Next, when the controller 27 determines that the external charging power source is a charging device that provides AC power, the controller 27 can electrically connect the 1st terminal and the 2nd terminal of the charging port 21 to the OBC 23, and appropriately control the OBC 23 so that the OBC 23 provides DC charging power to the battery 25 (S15). In step S15, the power factor correction circuit 231 in the OBC 23 not only improves the power factor of the input AC power but also serves as a circuit for converting the rectified power into DC.

[0059] An example of the OBC controlled by the controller 27 in step S15 is shown in Figure 3 shown.

[0060] The AC voltage applied by the external charging device is rectified by the rectifier circuit 235 of the OBC 23 and then applied to the power factor correction circuit 231. The power factor correction circuit 231 can be implemented as a boost converter topology composed of an inductor L, a diode D, and a switching device SW. The controller 27 can control the switching duty ratio of the switching device SW by performing voltage control and current control so that the voltage Vbus of the bus capacitor Cbus at the output terminal of the power factor correction circuit 231 becomes a desired target voltage. The control method of the power factor correction circuit 231 implemented as a boost converter topology is well known in the art and will not be described in detail here.

[0061] Next, the controller 27 can control the DC-DC converter 233 to convert the magnitude of the bus terminal voltage Vbus into a voltage magnitude suitable for charging the battery 25. The DC-DC converter 233 can be implemented as various topologies in the art and can also be controlled by control methods well known in the art.

[0062] Next, when the controller 27 determines that the external charging power source is the energy storage device 10 with the low-voltage battery 11, the controller 27 can electrically connect the terminal 1 and terminal 2 of the charging port 21 to the OBC 23, and appropriately control the OBC 23 so that the OBC 23 provides charging power with an appropriate voltage magnitude to the battery 25 (S16). In particular, in step S16, the controller 27 can control the power factor correction circuit 231 to operate as a simple boost converter.

[0063] An example of the OBC controlled by the controller 27 in step S16 is shown in Figure 3 the figure.

[0064] The DC voltage applied by the external low-voltage energy storage device 10 is applied to the rectifier circuit 235 of the OBC 23. Through the diode connection state of the rectifier circuit 235, the rectifier circuit 235 is not used to rectify the AC voltage, but only performs the function of transmitting the input DC voltage to the power factor correction circuit 231.

[0065] The controller 27 can determine the switching duty ratio of the switching device SW according to the ratio between the input voltage of the power factor correction circuit 231 and the target voltage to be output (i.e., the bus terminal voltage Vbus). It is obvious in this field that the switching duty ratio can be determined as the ratio of the input voltage to the predetermined target voltage in the boost converter composed of the inductor L, the diode D, and the switching device SW, so no additional detailed description is provided.

[0066] Next, the controller 27 can control the DC-DC converter 233 to convert the magnitude of the bus terminal voltage Vbus into a voltage magnitude suitable for charging the battery 25. The DC-DC converter 233 can be implemented in various topologies in this field, and can also be controlled by control methods well-known in the art.

[0067] The controller 27 can always check the charging state of the battery 25 during charging, and can end the charging when the charging state of the battery 25 reaches a predetermined charging state (S17).

[0068] As described above, various exemplary embodiments of the present disclosure enable charging a high-voltage battery in a vehicle from a low-voltage battery using a charging connector used in the prior art. In particular, even if there is no separate power conversion device for boosting in the external energy storage device with a low-voltage battery, charging can be performed by boosting the voltage of the low-voltage battery using the power factor correction circuit of the OBC installed in the vehicle and then applying the voltage to the battery in the vehicle.

[0069] Accordingly, the various exemplary embodiments of the present disclosure can reduce the size and weight of an energy storage device for charging a battery in a vehicle, lower the price of the energy storage device, and improve the availability of the energy storage device.

[0070] For example, it is easy to carry an energy storage device in a vehicle for discharging a battery in the vehicle, and it is easy for an individual to purchase or lease an energy storage device. In addition, a battery of an energy storage system (ESS) that is an existing power storage device can be used to charge a battery in a vehicle. Further, a simple energy storage device can be manufactured using waste batteries, whereby the residual value of waste batteries can be increased according to the expansion of the electric vehicle market.

[0071] Although the present disclosure has been described above with reference to specific embodiments, it will be apparent to those skilled in the art that the present disclosure can be changed and modified in various ways in the claims.

Claims

1. A battery-to-vehicle charging system, comprising: A charging port having a plurality of terminals coupled to a connector of an external charging power source, wherein the plurality of terminals include a power input terminal for selectively applying alternating current (AC) charging power and direct current (DC) charging power from the connector, a power input terminal for applying DC power having a voltage higher than the voltage of the battery from the connector, and a signal terminal for receiving a control signal for charging; An on-vehicle charger including a power factor correction circuit having an input terminal connected to the power input terminal of the charging port and having a boost converter topology; A battery charged by a charging voltage output from the on-vehicle charger; And A controller configured to determine a type of charging power based on the control signal input from the external charging power source through the terminals of the charging port and to control a charging process based on the determined type of charging power, wherein the type of charging power is divided into DC power having a voltage lower than the voltage of the battery, DC power having a voltage higher than the voltage of the battery, and AC power, wherein when the determined type of charging power is DC power having a voltage lower than the voltage of the battery, the controller controls the power factor correction circuit to operate as a boost converter, wherein the controller is configured to: activate a line connected to the power input terminal for selectively applying AC charging power and DC charging power from the connector based on the determined type of charging power being DC power having a voltage lower than the voltage of the battery, and activate a line connected to the power input terminal for applying DC power having a voltage higher than the voltage of the battery from the connector based on the determined type of charging power being DC power having a voltage higher than the voltage of the battery.

2. The system according to claim 1, wherein The controller determines the type of charging power based on the control signal input through a control pilot wire that couples the connector to the charging port.

3. The system according to claim 1, wherein, The controller receives the control signal in power line communication through the control pilot wire that couples the connector to the charging port.

4. The system according to claim 1, wherein, When the determined type of charging power is DC power having a voltage higher than the voltage of the battery, the controller electrically connects the power input terminal to the battery without operating the on-vehicle charger.

5. The system according to claim 1, wherein The power factor correction circuit has the boost converter topology including an inductor, a diode, and a switching device, and when the determined type of charging power is DC power having a voltage lower than the voltage of the battery, the controller determines a duty ratio of the switching device based on a ratio of the voltage of the charging power source to a target voltage at an output terminal of the power factor correction circuit.

6. The system according to claim 1, wherein The power factor correction circuit has the boost converter topology including an inductor, a diode, and a switching device, and When the determined type of charging power is alternating current (AC) power, the controller determines the duty ratio of the switching device by performing voltage control and current control so that the output voltage of the power factor correction circuit becomes the target voltage.

7. The system according to claim 1, wherein, The on-vehicle charger further includes a DC converter that converts the magnitude of the output voltage of the boost converter circuit into a predetermined magnitude of the charging voltage.

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