Vehicle system, charging system and charging connector

Abstract

The invention relates to a vehicle system including a power conversion device, a charging system, and a charging connector. In a vehicle system of the present invention, a charging system for charging a battery installed in the vehicle system includes: a charging unit that supplies power to the battery; and a power conversion circuit including a first variable resistor connected between the first output terminal and ground, and a second variable resistor and a first switch connected in series between the first output terminal and the first input terminal, thereby converting a first voltage of the charging unit into a second voltage, the second voltage is the driving voltage of the battery; and a charging control unit that controls a switching operation of the first switch, a size of the first variable resistance, and a size of the second variable resistance. A first input terminal of the power conversion circuit is connected to a positive electrode of the charging unit, and a first output terminal of the power conversion circuit is connected to a positive electrode of the battery.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0068455 filed in the Korean Intellectual Property Office on May 26, 2023, the entire contents of which are incorporated herein by reference.

[0003] The present disclosure relates to a vehicle system, a charging system, and a charging connector, each including a power conversion device. Background Art

[0004] As electric vehicles become more common, charging systems for their batteries are also becoming widely available. However, the power rating of the battery can vary depending on the type and brand of electric vehicle. Furthermore, the charging power can vary depending on the type and brand of charging system. This can be inconvenient for drivers, as they must find a charging system that matches the specifications of the battery installed in their vehicle. This has been cited as a problem that can reduce consumer enthusiasm for purchasing electric vehicles. Summary of the Invention

[0005] Technical issues

[0006] The present disclosure seeks to provide a vehicle system, a charging system, and a charging connector capable of easily charging batteries between a battery system having batteries having various rated voltages and a charging system having various charging voltages.

[0007] Technical Solution

[0008] An exemplary embodiment of the present disclosure provides a charging system for charging a battery installed on a vehicle system, the charging system including: a charging unit that supplies power to the battery; a power conversion circuit that includes a first variable resistor connected between a first output terminal and ground, and a second variable resistor and a first switch that are connected in series with each other between the first output terminal and a first input terminal, the power conversion circuit converting a first voltage of the charging unit into a second voltage, the second voltage being a driving voltage of the battery; and a charging control unit that controls a switching operation of the first switch, a size of the first variable resistor, and a size of the second variable resistor, wherein the first input terminal of the power conversion circuit is connected to a positive electrode of the charging unit, and the first output terminal of the power conversion circuit is connected to a positive electrode of the battery.

[0009] The power conversion circuit may further include a second switch connected between the first output terminal and the first input terminal, and when the magnitude of the first voltage is equal to the magnitude of the second voltage, the charging control unit may control the first switch to be disconnected and control the second switch to be connected.

[0010] When the magnitude of the first voltage and the magnitude of the second voltage are different, the charging control unit may control the first switch to be turned on, and control the second switch to be turned off.

[0011] When the magnitude of the first voltage is twice that of the second voltage, the charging control unit may control the first variable resistor and the second variable resistor so that the resistance values of the first variable resistor and the second variable resistor are equal.

[0012] Another exemplary embodiment of the present disclosure provides a vehicle system for charging a battery using power from a charging system, the vehicle system including: a battery system including the battery and a battery management system (BMS) that manages the status of the battery; a power conversion circuit including a first variable resistor connected between a first output terminal and ground, and a second variable resistor and a first switch connected in series with each other between the first output terminal and a first input terminal, the power conversion circuit converting a first voltage of power supplied by the charging system into a second voltage, the second voltage being a driving voltage of the battery; and a vehicle control unit that controls switching operation of the first switch, a magnitude of the first variable resistor, and a magnitude of the second variable resistor, wherein the first input terminal of the power conversion circuit is connected to a positive electrode of the charging system, and the first output terminal of the power conversion circuit is connected to a positive electrode of the battery.

[0013] The power conversion circuit may further include a second switch connected between the first output terminal and the first input terminal, and when the magnitude of the first voltage is equal to the magnitude of the second voltage, the vehicle control unit may control the first switch to be disconnected and control the second switch to be connected.

[0014] When the magnitude of the first voltage is different from the magnitude of the second voltage, the vehicle control unit may control the first switch to be turned on and control the second switch to be turned off.

[0015] When the magnitude of the first voltage is twice that of the second voltage, the vehicle control unit controls the first variable resistor and the second variable resistor so that the resistance values of the first variable resistor and the second variable resistor are equal.

[0016] Another exemplary embodiment of the present disclosure provides a charging connector for electrically connecting a vehicle system and a charging system to each other to charge a battery, the charging connector including: a power conversion circuit including a first variable resistor connected between a first output terminal and ground, and a second variable resistor and a first switch connected in series between the first output terminal and a first input terminal, the power conversion circuit converting a first voltage of power supplied by the charging system into a second voltage, the second voltage being a driving voltage of the battery; and a connector control unit controlling a switching operation of the first switch, a magnitude of the first variable resistor, and a magnitude of the second variable resistor, wherein the first input terminal of the power conversion circuit is connected to a positive electrode of the charging system, and the first output terminal of the power conversion circuit is connected to a positive electrode of the battery.

[0017] The power conversion circuit also includes a second switch connected between the first output terminal and the first input terminal, and when the magnitude of the first voltage is equal to the magnitude of the second voltage, the joint control unit can control the first switch to be disconnected and control the second switch to be connected.

[0018] When the magnitude of the first voltage and the magnitude of the second voltage are different, the joint control unit may control the first switch to be turned on, and control the second switch to be turned off.

[0019] When the magnitude of the first voltage is twice that of the second voltage, the joint control unit may control the first variable resistor and the second variable resistor so that the resistance values of the first variable resistor and the second variable resistor are equal.

[0020] Beneficial effects

[0021] The present disclosure enables easy charging of batteries between battery systems having batteries with various rated voltages and charging systems having various charging voltages by providing a universal charging system, a universal vehicle system, or a universal charging connector.

[0022] By increasing the convenience of charging the battery, the present disclosure can increase consumers' motivation to purchase electric vehicles.

[0023] The present disclosure can charge batteries of various electric vehicles using only one charging system, without having to provide multiple charging systems corresponding to the rated voltages of multiple batteries, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a diagram illustrating a charging system including a power conversion device according to an exemplary embodiment.

[0025] Figure 2 is a diagram illustrating a vehicle system including a power conversion device according to another exemplary embodiment.

[0026] Figure 3 is a diagram illustrating a charging connector including a power conversion device according to another exemplary embodiment.

[0027] Figure 4 is a flowchart illustrating a battery charging method according to another exemplary embodiment. DETAILED DESCRIPTION

[0028] Hereinafter, the exemplary embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings, and the same or similar components will be assigned the same or similar figure marks, and their redundant descriptions will be omitted. The suffixes "module" and / or "unit" of the components used in the following description are given or used interchangeably only for the ease of writing the specification, and do not themselves have different meanings or roles. In addition, when describing the exemplary embodiments disclosed in this specification, if the detailed description of the relevant known technology unnecessarily obscures the main points of the exemplary embodiments disclosed in this specification, the detailed description of the relevant known technology will be omitted. In addition, it should be understood that the drawings are provided only to help easily understand the exemplary embodiments disclosed in this specification, and the technical concepts disclosed in this specification are not limited to the drawings, and cover all modifications, equivalents and replacements within the spirit and technical scope of the present disclosure.

[0029] Terms including ordinal numbers such as first and second may be used to describe various components, but these components are not limited by these terms. Such terms are used only for the purpose of distinguishing one component from another.

[0030] It should be understood that when a component is referred to as being “connected to” or “coupled to” another component, the component may be directly connected or coupled to the other component, or connected or coupled to the other component with intervening components present. On the other hand, it should be understood that when a component is referred to as being “directly connected to” or “directly coupled to” another component, the component may be connected to the other component without intervening components present.

[0031] It should be understood that the terms "including", "having", etc. used in this application specify the existence of the features, numbers, steps, operations, components, parts or their combinations mentioned in the specification, but do not exclude the existence or addition of one or more other features, numbers, steps, operations, components, parts or their combinations.

[0032] Figure 1 is a diagram illustrating a charging system including a power conversion device according to an exemplary embodiment.

[0033] refer to Figure 1 , the vehicle system 1 may be a higher-level system in which the battery system 3 is mounted. However, the exemplary embodiment is not limited to the vehicle system 1 and may also be applied to various higher-level systems in which the battery system 3 is mounted.

[0034] The vehicle system 1 includes a vehicle communication unit 11 and a vehicle control unit 13 .

[0035] The vehicle communication unit 11 may include a communication module for communicating with each of the charging communication unit 23 of the charging system 2 and the battery communication unit 35 of the battery system 3. For example, the vehicle communication unit 11 may receive battery data including information related to the status of the battery 31 from the battery communication unit 35, and transmit control signals for various switches in the battery system 3 to the battery communication unit 35. As another example, the vehicle communication unit 11 may receive various data collected during the process of charging the battery 31 from the charging communication unit 23, or transmit battery data received from the battery system 3 to the charging communication unit 23.

[0036] The vehicle control unit 13 may control the overall process of charging the battery 31. For example, the vehicle control unit 13 may check the status of each of the charging system 2 and the battery system 3 and send a control signal to each of the charging system 2 and the battery system 3 for smooth charging.

[0037] The battery system 3 may be a power source that supplies power to the vehicle system 1 . The battery system 3 includes a battery 31 , a battery communication unit 33 , and a battery management system (hereinafter referred to as “BMS”) 35 .

[0038] The battery 31 may include a plurality of battery cells connected in series and in parallel. In some exemplary embodiments, the battery cells may be rechargeable secondary batteries. A predetermined number of battery cells may be connected in series to form a battery module, a predetermined number of battery modules may be connected in series to form a battery pack, and a predetermined number of battery packs may be connected in parallel to form a battery bank, thereby supplying a desired amount of power. Figure 1 3 shows the battery 31 in which a plurality of battery cells are connected in series to one another, but the battery 31 is not limited thereto and may be configured in units of a battery module, a battery pack, or a battery bank.

[0039] The battery 31 may be a battery that provides high power to an external device (eg, a motor). Figure 1 In the embodiment, the battery 31 can be connected between the two output terminals B_OUT1 and B_OUT2 of the battery system 3 . Figure 1 The illustrated components and connection relationships between the components are examples, and the present disclosure is not limited thereto.

[0040] The battery communication unit 33 may include a communication module capable of communicating with the vehicle communication unit 11. For example, the battery communication unit 33 may transmit battery data including information related to the battery state to the vehicle system 1 under the control of the BMS 35. As another example, the vehicle system 1 may receive various control signals from the battery communication unit 33.

[0041] The BMS 35 can generally manage and control the battery system 3. During charging of the battery 31 using power from the charging system 2, the battery 31 and the charging system 2 can be electrically connected to each other by controlling a battery relay unit (not shown) connected between one end of the battery 31 and at least one of the two output terminals B_OUT1 and B_OUT2 of the battery system 3.

[0042] The charging system 2 may include a power conversion device PS, a charging unit 21 , a charging communication unit 23 , and a charging control unit 25 .

[0043] The power conversion device PS includes a circuit that converts a first voltage of the power supplied by the charging system 2 into a second voltage that is a rated voltage of the battery 31. Figure 1 , the power conversion device PS may be included in the charging system 2 .

[0044] Reference Figure 1 The power conversion device PS may include a first switch SW_1, a second switch SW_2, a first variable resistor R1, and a second variable resistor R2. According to an exemplary embodiment, in a normal state, which is a non-control state of the charging control unit 25, the default values of the first variable resistor R1 and the second variable resistor R2 may be the same.

[0045] For example, the first variable resistor R1 may be connected between the first output terminal OUT1 and the second output terminal OUT2 of the power conversion device PS. The second variable resistor R2 and the first switch SW_1 may be connected in series between the first output terminal OUT1 of the power conversion device PS and the first input terminal IN_1 of the power conversion device PS. One end of the second variable resistor R2 may be connected to the first output terminal OUT1, and the other end of the second variable resistor R2 may be connected to one end of the first switch SW_1. The other end of the first switch SW_1 may be connected to the first input terminal IN_1 of the power conversion device PS. The second switch SW_2 may be connected between the first input terminal IN_1 and the first output terminal OUT1 of the power conversion device PS.

[0046] The first input terminal IN_1 of the power conversion device PS can be connected to the positive electrode of the charging unit 21. The second input terminal IN_2 of the power conversion device PS can be connected to the negative electrode of the charging unit 21. The first output terminal OUT1 of the power conversion device PS can be connected to the positive electrode of the battery 31. The second output terminal OUT2 of the power conversion device PS can be connected to the negative electrode of the battery 31.

[0047] The charging unit 21 can charge the battery 31 by supplying power to the battery 31. The charging unit 21 can be a power source. For example, the charging unit 21 can supply 800V or 400V power to the battery 31. As another example, the battery 31 can be charged with 800V or 400V power.

[0048] The charging communication unit 23 may include a communication module capable of communicating with the vehicle communication unit 11. For example, the charging communication unit 23 may transmit charging data including information on the magnitude of the charging current, the magnitude of the charging voltage, etc. to the vehicle communication unit 11 in real time or at predetermined intervals while charging is in progress under the control of the charging control unit 25.

[0049] The charging control unit 25 can control the entire charging process. According to an exemplary embodiment, the charging control unit 25 can control the switching of the plurality of switches SW_1 and SW_2 included in the power conversion device PS. The charging control unit 25 can also control the size of the plurality of variable resistors R1 and R2 included in the power conversion device PS.

[0050] The charging control unit 25 can control whether the first switch SW_1 is turned on or off by sending a first switch control signal [SC]_1 to the first switch SW_1 and a second switch control signal [SC]_2 to the second switch SW_2.

[0051] The charging control unit 25 can change the magnitude of the charging current during charging to implement various charging methods. According to an exemplary embodiment, the charging control unit 25 can change the magnitude of the charging current by controlling the magnitudes of the first variable resistor R1 and the second variable resistor R2. According to an exemplary embodiment, the charging control unit 25 can change the magnitudes of the first variable resistor R1 and the second variable resistor R2 to match the magnitudes of a first voltage and a second voltage, where the first voltage is the charging voltage of the charging unit 21 and the second voltage is the rated voltage of the battery 31.

[0052] Figure 2 is a diagram illustrating a vehicle system including a power conversion device according to another exemplary embodiment.

[0053] Although the power conversion device PS Figure 2, the power conversion device PS is shown outside the battery system 3 , but is not limited thereto and may be located inside the battery system 3 .

[0054] Figure 1 The vehicle system 1, charging system 2 and battery system 3 shown may correspond to Figure 2 The vehicle system 1, charging system 2 and battery system 3 are shown. For example, the multiple components included in each of the vehicle system 1, charging system 2 and battery system 3 and the corresponding functions of the multiple components are similar to those of the reference Figure 1 Those described are the same, and detailed descriptions thereof will be omitted.

[0055] Although according to the exemplary embodiment Figure 1 The power conversion device PS shown is included in the charging system 2, but according to another exemplary embodiment Figure 2 The illustrated power conversion device PS may be included in the vehicle system 1 .

[0056] The vehicle control unit 13 of the vehicle system 1 can control the switching of the plurality of switches SW_1 and SW_2 included in the power conversion device PS and the magnitude of the plurality of variable resistors R1 and R2 included in the power conversion device PS. Figure 2 , the power conversion device PS is shown outside the battery system 3 , but is not limited thereto and may be located inside the battery system 3 .

[0057] Figure 3 is a diagram illustrating a charging connector including a power conversion device according to another exemplary embodiment.

[0058] Figure 1 The vehicle system 1, charging system 2 and battery system 3 shown may correspond to Figure 3 The vehicle system 1, charging system 2 and battery system 3 are shown. For example, the multiple components included in each of the vehicle system 1, charging system 2 and battery system 3 and the corresponding functions of the multiple components are similar to those of the reference Figure 1 Those described are the same, and detailed descriptions thereof will be omitted.

[0059] Although according to the exemplary embodiment Figure 1 The power conversion device PS shown is included in the charging system 2, but according to another exemplary embodiment Figure 3 The illustrated power conversion device PS may be included in a charging connector 4 that electrically connects the battery system 3 and the charging system 2 to each other.

[0060] The charging connector 4 may be a connector that connects the battery system 3 and the charging system 2 to each other to charge the battery 31. Figure 3The charging connector 4 may include a power conversion device PS, a connector communication unit PT, and a connector control unit PC. Here, the components of the power conversion device PS are similar to those in the reference Figure 1 The components described are the same, so their detailed description will be omitted.

[0061] The joint communication unit PT may include a communication module capable of communicating with the vehicle communication unit 11 and the charging communication unit 23. For example, the joint communication unit PT may transmit charging data including information on the magnitude of the charging current, the magnitude of the charging voltage, etc. to the vehicle communication unit 11 in real time or at predetermined intervals while charging is in progress under the control of the joint control unit PC.

[0062] The joint control unit PC may control the switching of the plurality of switches SW_1 and SW_2 included in the power conversion device PS. The joint control unit PC may control the size of the plurality of variable resistors R1 and R2 included in the power conversion device PS.

[0063] Figure 4 is a flowchart illustrating a battery charging method according to another exemplary embodiment.

[0064] Reference Figure 4 , the control unit checks the magnitude of a first voltage which is a charging voltage of the charging unit 21 and the magnitude of a second voltage which is a rated voltage of the battery 31 ( S100 ).

[0065] According to the exemplary embodiment, when the power conversion device PS is included in the charging system 2, the charging control unit 25 checks the magnitude of a first voltage, which is the charging voltage of the charging unit 21, and the magnitude of a second voltage, which is the rated voltage of the battery 31. For example, the charging control unit 25 can receive information about the magnitude of the second voltage from the vehicle system 1 through the charging communication unit 23.

[0066] According to another exemplary embodiment, when the power conversion device PS is included in the vehicle system 1, the vehicle control unit 13 checks the magnitude of a first voltage, which is the charging voltage of the charging unit 21, and the magnitude of a second voltage, which is the rated voltage of the battery 31. For example, the vehicle control unit 13 can receive information about the magnitude of the first voltage from the charging system 2 via the vehicle communication unit 11.

[0067] According to another exemplary embodiment, when the charging connector 4 includes a power conversion device PS, the connector control unit PC checks the magnitude of a first voltage, which is the charging voltage of the charging unit 21, and a second voltage, which is the rated voltage of the battery 31. For example, the connector control unit PC can receive information about the magnitude of the first voltage from the charging system 2 via the connector communication unit PT. Furthermore, the connector control unit PC can receive information about the magnitude of the second voltage from the vehicle system 1 via the connector communication unit PT.

[0068] Next, the control unit controls the plurality of switches SW_1 and SW_2 included in the power conversion device PS to match the magnitude of the first voltage and the magnitude of the second voltage ( S200 ).

[0069] For example, it is assumed that the first voltage of the charging unit 21 is 800 V, and the second voltage of the battery 31 is 400 V. Furthermore, it is assumed that the first variable resistor R1 and the second variable resistor R2 have the same default resistance value.

[0070] According to an exemplary embodiment, referring to Figure 1 , the charging control unit 25 can control the first switch SW_1 to be turned on. Then, the 800V power output from the charging unit 21 can be changed to 400V power according to the resistance ratio of the first variable resistor R1 and the second variable resistor R2, and the 400V power can be supplied to the battery 31.

[0071] According to another exemplary embodiment, referring to Figure 2 The vehicle control unit 13 may control the first switch SW_1 to be turned on. Then, the 800V power output from the charging unit 21 may be changed to 400V power according to the ratio of the first variable resistor R1 to the second variable resistor R2, and the 400V power may be supplied to the battery 31.

[0072] According to another exemplary embodiment, referring to Figure 3 , the joint control unit PC can control the first switch SW_1 to be turned on. Then, the 800V power output from the charging unit 21 can be changed to 400V power according to the ratio of the first variable resistor R1 to the second variable resistor R2, and the 400V power can be supplied to the battery 31.

[0073] For another example, assume that the first voltage of the charging unit 21 and the second voltage of the battery 31 are both 800 V. In addition, assume that the default values of the first variable resistor R1 and the second variable resistor R2 are the same.

[0074] According to an exemplary embodiment, referring to Figure 1, the charging control unit 25 can control the second switch SW_2 to be turned on. Then, both ends of the charging system 2 and the battery system 3 can be connected to each other, and the 800V power output from the charging unit 21 can be supplied to the battery 31. In other words, the charging power of the charging unit 21 can be supplied to the battery 31 without a voltage drop.

[0075] According to another exemplary embodiment, referring to Figure 2 , the vehicle control unit 13 can control the second switch SW_2 to be turned on. Then, both ends of the charging system 2 and the battery system 3 can be connected to each other, and the 800V power output from the charging unit 21 can be supplied to the battery 31. In other words, the charging power of the charging unit 21 can be supplied to the battery 31 without a voltage drop.

[0076] According to another exemplary embodiment, referring to Figure 3 , the joint control unit PC can control the second switch SW_2 to turn on. Then, both ends of the charging system 2 and the battery system 3 can be connected to each other, and the 800V power output from the charging unit 21 can be supplied to the battery 31. In other words, the charging power of the charging unit 21 can be supplied to the battery 31 without voltage drop.

[0077] For another example, assume that the first voltage of the charging unit 21 is 900 V, and the second voltage of the battery 31 is 300 V. The control unit may control the magnitudes of the first variable resistor R1 and the second variable resistor R2.

[0078] According to an exemplary embodiment, referring to Figure 1 , the charging control unit 25 can control the size of the first variable resistor R1 and the second variable resistor R2 so that the ratio of the size of the first variable resistor R1 to the total size of the multiple variable resistors R1 and R2 connected in series with each other (for example, 100Ω / (100Ω+200Ω)=1 / 3) is equal to the ratio (1 / 3) of the size of the second voltage (300V) to the size of the first voltage (900V). For example, the charging control unit 25 can control the sizes of the first variable resistor R1 and the second variable resistor R2 to 100Ω and 200Ω, respectively. In addition, the charging control unit 25 can control the first switch SW_1 to be turned on. Then, the 900V power output from the charging unit 21 can be changed to 300V power according to the resistance distribution ratio between the first variable resistor R1 and the second variable resistor R2, and the 300V power can be supplied to the battery 31.

[0079] According to another exemplary embodiment, referring to Figure 2, the vehicle control unit 13 can control the size of the first variable resistor R1 and the second variable resistor R2 so that the ratio of the size of the first variable resistor R1 to the total size of the multiple variable resistors R1 and R2 connected in series with each other (for example, 100Ω / (100Ω+200Ω)=1 / 3) is equal to the ratio (1 / 3) of the size of the second voltage (300V) to the size of the first voltage (900V). For example, the charging control unit 25 can control the sizes of the first variable resistor R1 and the second variable resistor R2 to 100Ω and 200Ω, respectively. In addition, the vehicle control unit 13 can control the first switch SW_1 to be turned on. Then, the 900V power output from the charging unit 21 can be changed to 300V power according to the resistance distribution ratio between the first variable resistor R1 and the second variable resistor R2, and the 300V power can be supplied to the battery 31.

[0080] According to another exemplary embodiment, referring to Figure 3 , the connector control unit PC can control the size of the first variable resistor R1 and the second variable resistor R2 so that the ratio of the size of the first variable resistor R1 to the total size of the multiple variable resistors R1 and R2 connected in series to each other (for example, 100Ω / (100Ω+200Ω)=1 / 3) is equal to the ratio (1 / 3) of the size of the second voltage (300V) to the size of the first voltage (900V). For example, the connector control unit PC can control the sizes of the first variable resistor R1 and the second variable resistor R2 to 100Ω and 200Ω, respectively. In addition, the connector control unit PC can control the first switch SW_1 to be turned on. Then, the 900V power output from the charging unit 21 can be changed to 300V power according to the resistance distribution ratio between the first variable resistor R1 and the second variable resistor R2, and the 300V power can be supplied to the battery 31.

[0081] Next, the control unit controls charging of the battery 31 ( S300 ).

[0082] According to an exemplary embodiment, referring to Figure 1 For example, assuming that the charging control unit 25 uses a constant current charging method to charge the battery 31, the charging control unit 25 can change the magnitude of the charging current supplied to the battery 31 by controlling the first variable resistor R1 and the second variable resistor R2.

[0083] According to another exemplary embodiment, referring to Figure 2 , assuming that the vehicle control unit 13 uses a constant current charging method to charge the battery 31. The vehicle control unit 13 can change the magnitude of the charging current supplied to the battery 31 by controlling the first variable resistor R1 and the second variable resistor R2.

[0084] According to another exemplary embodiment, referring to Figure 3 , assuming that the joint control unit PC uses a constant current charging method to charge the battery 31. The joint control unit PC can change the magnitude of the charging current supplied to the battery 31 by controlling the first variable resistor R1 and the second variable resistor R2.

[0085] Although the exemplary embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not limited thereto, and various modifications and improvements made by ordinary technicians in the field to which the present disclosure belongs also fall within the scope of the present disclosure.

Claims

1. A charging system for charging a battery installed in a vehicle system, the charging system comprising: a charging unit, the charging unit supplying power to the battery; a power conversion circuit, the power conversion circuit comprising a first variable resistor, a second variable resistor, and a first switch, the first variable resistor being connected between a first output terminal and ground, the second variable resistor and the first switch being connected in series between the first output terminal and a first input terminal, the power conversion circuit converting a first voltage of the charging unit into a second voltage, the second voltage being a driving voltage of the battery; as well as a charging control unit configured to control a switching operation of the first switch, a magnitude of the first variable resistor, and a magnitude of the second variable resistor; wherein the first input terminal of the power conversion circuit is connected to the positive electrode of the charging unit, and The first output terminal of the power conversion circuit is connected to the positive electrode of the battery.

2. The charging system according to claim 1, wherein: The power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal, and When the magnitude of the first voltage is equal to the magnitude of the second voltage, the charging control unit controls the first switch to be turned off and controls the second switch to be turned on.

3. The charging system according to claim 1, wherein: When the magnitude of the first voltage and the magnitude of the second voltage are different, the charging control unit controls the first switch to be turned on, and controls the second switch to be turned off.

4. The charging system according to claim 3, wherein: When the magnitude of the first voltage is twice that of the second voltage, the charging control unit controls the first variable resistor and the second variable resistor so that the resistance value of the first variable resistor is equal to the resistance value of the second variable resistor.

5. A vehicle system that charges a battery using power from a charging system, the vehicle system comprising: A battery system, the battery system comprising the battery and a battery management system BMS for managing the state of the battery; a power conversion circuit comprising a first variable resistor, a second variable resistor, and a first switch, the first variable resistor being connected between a first output terminal and ground, the second variable resistor and the first switch being connected in series with each other between the first output terminal and a first input terminal, the power conversion circuit converting a first voltage of power supplied by the charging system into a second voltage, the second voltage being a driving voltage of the battery; as well as a vehicle control unit that controls the switching operation of the first switch, the magnitude of the first variable resistor, and the magnitude of the second variable resistor, wherein the first input terminal of the power conversion circuit is connected to the positive electrode of the charging system, and The first output terminal of the power conversion circuit is connected to the positive electrode of the battery. The vehicle system according to claim 5 , wherein: The power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal, and When the magnitude of the first voltage is equal to the magnitude of the second voltage, the vehicle control unit controls the first switch to be turned off and controls the second switch to be turned on.

7. The vehicle system according to claim 5, wherein: When the magnitude of the first voltage is different from the magnitude of the second voltage, the vehicle control unit controls the first switch to be turned on and controls the second switch to be turned off.

8. The vehicle system according to claim 7, wherein: When the magnitude of the first voltage is twice that of the second voltage, the vehicle control unit controls the first variable resistor and the second variable resistor so that the resistance value of the first variable resistor is equal to the resistance value of the second variable resistor.

9. A charging connector for electrically connecting a vehicle system and a charging system to each other to charge a battery, the charging connector comprising: a power conversion circuit comprising a first variable resistor, a second variable resistor, and a first switch, the first variable resistor being connected between a first output terminal and ground, the second variable resistor and the first switch being connected in series with each other between the first output terminal and a first input terminal, the power conversion circuit converting a first voltage of power supplied by the charging system into a second voltage, the second voltage being a driving voltage of the battery; as well as a joint control unit, the joint control unit controlling the switching operation of the first switch, the size of the first variable resistor, and the size of the second variable resistor, wherein the first input terminal of the power conversion circuit is connected to the positive electrode of the charging system, and The first output terminal of the power conversion circuit is connected to the positive electrode of the battery.

10. The charging connector according to claim 9, wherein: The power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal, and When the magnitude of the first voltage is equal to the magnitude of the second voltage, the joint control unit controls the first switch to be turned off and controls the second switch to be turned on.

11. The charging connector according to claim 9, wherein: When the magnitude of the first voltage is different from the magnitude of the second voltage, the joint control unit controls the first switch to be turned on and controls the second switch to be turned off.

12. The charging connector according to claim 11, wherein: When the magnitude of the first voltage is twice that of the second voltage, the joint control unit controls the first variable resistor and the second variable resistor so that the resistance value of the first variable resistor is equal to the resistance value of the second variable resistor.

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