Automotive systems, charging systems, and charging gender

Abstract

The present invention relates to an automobile system, a charging system, and a charging gender that include a power conversion device. The automobile system of the present invention is a charging system that charges a battery installed in the automobile system, and includes a charging unit that supplies power to the battery, a first variable resistor connected between a first output terminal and ground, a second variable resistor and a first switch connected in series between the first output terminal and a first input terminal, a power conversion circuit that converts a first voltage of the charging unit to a second voltage that is the rated voltage of the battery, and a charging 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, and 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.

Description

Technical Field

[0001] [Cross-Reference to Related Application] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0068455 filed on May 26, 2023, and all contents disclosed in the document of said Korean patent application are incorporated as a part of the present specification.

[0002] The present invention relates to a vehicle system including a power conversion device, a charging system, and a charging gender.

Background Art

[0003] With the popularization of electric vehicles, charging systems for charging batteries of electric vehicles are also becoming widespread. However, the rated power of the battery may differ depending on the type and brand of the electric vehicle. Also, the charging power may differ depending on the type and brand of the charging system. Drivers have the inconvenience of having to find a charging system that matches the specifications of the battery installed in the vehicle. This has been pointed out as a problem that reduces consumers' willingness to purchase when they intend to buy an electric vehicle.

Summary of the Invention

Problem to be Solved by the Invention

[0004] The present invention provides a vehicle system, a charging system, and a charging gender that can easily charge a battery even between a battery system having batteries with various rated voltages and a charging system with various charging voltages.

Means for Solving the Problem

[0005] A charging system according to one embodiment of the present invention is a charging system for charging a battery mounted in an automobile system, and includes a charging unit that supplies power to the battery, a first variable resistor connected between a first output terminal and ground, a second variable resistor connected in series between the first output terminal and a first input terminal, and a first switch, a power conversion circuit that converts a first voltage of the charging unit to a second voltage which is the driving voltage of the battery, and a charging 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 terminal of the charging unit, and the first output terminal of the power conversion circuit is connected to the positive terminal of the battery.

[0006] The power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal, and the charging control unit may control the first switch to turn off and the second switch to turn on when the magnitudes of the first voltage and the second voltage are equal.

[0007] The charging control unit may, when the magnitudes of the first voltage and the second voltage are different, control the first switch to turn on and the second switch to turn off.

[0008] The charging control unit may control the first variable resistor and the second variable resistor so that their resistance values ​​become equal when the magnitude of the first voltage and the magnitude of the second voltage correspond to twice each other.

[0009] Another feature of the present invention is an automotive system that charges a battery with power from a charging system, comprising: a battery system including the battery and a BMS (Battery Management System) for managing the state of the battery; a power conversion circuit that converts a first voltage of power supplied by the charging system to a second voltage which is the drive voltage of the battery, comprising a first variable resistor connected between a first output terminal and ground, a second variable resistor connected in series between the first output terminal and a first input terminal, and a first switch, comprising an automotive 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 may be connected to the positive terminal of the charging system, and the first output terminal of the power conversion circuit may be connected to the positive terminal of the battery.

[0010] The power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal, and the automobile control unit may control the first switch to turn off and the second switch to turn on when the magnitudes of the first voltage and the second voltage are equal.

[0011] The vehicle control unit may, when the magnitudes of the first voltage and the second voltage are different, control the first switch to turn on and the second switch to turn off.

[0012] The automobile control unit may control the first variable resistor and the second variable resistor so that their resistance values ​​become equal when the magnitude of the first voltage and the magnitude of the second voltage correspond to twice each other.

[0013] An electrical gender according to another feature of the present invention is a charging gender for electrically connecting an automotive system and a charging system for charging a battery, comprising a first variable resistor connected between a first output terminal and ground, a second variable resistor connected in series between the first output terminal and a first input terminal, and a first switch, a power conversion circuit that converts a first voltage of power supplied by the charging system to a second voltage which is the drive voltage of the battery, and a gender 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 terminal of the charging system, and the first output terminal of the power conversion circuit is connected to the positive terminal of the battery.

[0014] The power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal, and the gender control unit may control the first switch to turn off and the second switch to turn on when the magnitudes of the first voltage and the second voltage are equal.

[0015] The gender control unit may, when the magnitudes of the first voltage and the second voltage are different, control the first switch to turn on and the second switch to turn off.

[0016] The gender control unit may control the first variable resistor and the second variable resistor so that their resistance values ​​become equal when the magnitude of the first voltage corresponds to twice the magnitude of the second voltage. [Effects of the Invention]

[0017] According to embodiments of the present invention, by providing a shared charging system, a shared automotive system, or a shared charging gender, batteries can be easily charged between a battery system having batteries of various rated voltages and a charging system having various charging voltages.

[0018] According to embodiments of the present invention, it is possible to improve the convenience of battery charging and increase consumer willingness to purchase electric vehicles.

[0019] According to embodiments of the present invention, it is not necessary to have multiple charging systems corresponding to the rated voltages of multiple batteries, and batteries of various electric vehicles can be charged with only one charging system, thereby reducing costs. [Brief explanation of the drawing]

[0020] [Figure 1] This is a diagram illustrating a charging system including a power conversion device according to one embodiment. [Figure 2] This is a diagram illustrating an automobile system including a power converter according to another embodiment. [Figure 3] This is a diagram illustrating a charging gender including a power conversion device according to another embodiment. [Figure 4] This is a flowchart illustrating a battery charging method according to another embodiment. [Modes for carrying out the invention]

[0021] The following descriptions will detail various embodiments of the present invention with reference to the attached drawings, but identical or similar components will be denoted by the same reference numerals, and redundant descriptions will be omitted. The component suffixes “module” and / or “part” used in the following descriptions are added or used interchangeably solely for the sake of ease of writing the specification and do not have any distinguishing meaning or role in themselves. Furthermore, in describing the embodiments disclosed herein, detailed descriptions of related prior art will be omitted if it is determined that such descriptions would obscure the gist of the embodiments disclosed herein. The attached drawings are provided to facilitate understanding of the embodiments disclosed herein, and should be understood that the technical ideas disclosed herein are not limited by the attached drawings and include all modifications, equivalents, or substitutes that fall within the concept and technical scope of the present invention.

[0022] Terms including ordinal numbers such as first and second may be used to describe various constituent elements, but the constituent elements are not limited by these terms. Said terms are used only for the purpose of distinguishing one constituent element from another constituent element.

[0023] When a constituent element is referred to as being "coupled to" or "connected to" another constituent element, it should be understood that the constituent element may be directly coupled or connected to the other constituent element, but another constituent element may be present therebetween. On the other hand, when a constituent element is referred to as being "directly coupled to" or "directly connected to" another constituent element, it should be understood that no other constituent element is present therebetween.

[0024] It should be understood that in the present application, terms such as "comprising" or "having" specify that features, numbers, steps, operations, constituent elements, components, or combinations thereof described in the specification exist, and do not exclude in advance the existence or possibility of addition of one or more other features, numbers, steps, operations, constituent elements, components, or combinations thereof.

[0025] Fig. 1 is a drawing illustrating a charging system including a power conversion device according to an embodiment.

[0026] Referring to Fig. 1, a vehicle system 1 may be a host system on which a battery system 3 is mounted. However, the embodiment is not limited to the vehicle system 1, and may also be applied to various host systems on which a battery system 3 is mounted.

[0027] The vehicle system 1 includes a vehicle communication unit 11 and a vehicle control unit 13.

[0028] The automotive communication unit 11 may include communication modules for communicating with the charging communication unit 23 of the charging system 2 and the battery communication unit 33 of the battery system 3. For example, the automotive communication unit 11 can receive battery data, including information about the state of the battery 31, from the battery communication unit 33, and transmit control signals for various switches within the battery system 3 to the battery communication unit 33. As another example, the automotive communication unit 11 can receive various data collected during the charging process of 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.

[0029] The vehicle control unit 13 can control the entire process of charging the battery 31. For example, the vehicle control unit 13 can check the status of the charging system 2 and the battery system 3 and transmit control signals to the charging system 2 and the battery system 3 respectively to ensure smooth charging.

[0030] The battery system 3 may also be a power source that supplies power to the automobile system 1. The battery system 3 includes a battery 31, a battery communication unit 33, and a battery management system (BMS) 35.

[0031] The battery 31 may include multiple battery cells connected in series and in parallel. In one embodiment, the battery cells may be rechargeable secondary batteries. A predetermined number of battery cells connected in series can form a battery module, a predetermined number of battery modules connected in series can form a battery pack, and a predetermined number of battery packs connected in parallel can form a battery bank, thereby supplying a desired amount of power. Figure 1 illustrates a battery 31 in which multiple battery cells are connected in series, but the battery 31 is not limited to this configuration and can be configured in units of battery modules, battery packs, or battery banks.

[0032] Battery 31 may be a battery that provides high-power power to an external device (e.g., a motor). In Figure 1, battery 31 may be connected between the two output terminals B_OUT1 and B_OUT2 of the battery system 2. The configuration and connections between the configurations shown in Figure 1 are examples and the present invention is not limited thereto.

[0033] The battery communication unit 33 may include a communication module that can communicate with the vehicle communication unit 11. For example, the battery communication unit 33 can transmit battery data, including information about the battery status, to the vehicle system 1 for the control of the BMS 35. As another example, the battery communication unit 33 can receive various control signals from the vehicle system 1.

[0034] The BMS35 can manage and control the battery system 3 as a whole. In the process of charging the battery 31 with power from the charging system 2, it can control a battery relay unit (not shown) connected between one end of the battery 31 and at least one of the two output terminals OUT1 and OUT2 of the battery system 3, thereby electrically connecting the battery 31 and the charging system 2.

[0035] The charging system 2 may include a power converter PS, a charging unit 21, a charging communication unit 23, and a charging control unit 25.

[0036] The power converter PS includes a circuit that converts the first voltage of the power supplied by the charging system 2 to a second voltage, which is the rated voltage of the battery 31. In one embodiment, referring to Figure 1, the power converter PS may be included in the charging system 2.

[0037] Referring to Figure 1, the power converter PS may include a first switch SW_1, a second switch SW_2, a first variable resistor R1, and a second variable resistor R2. In this embodiment, the default values ​​of the first variable resistor R1 and the second variable resistor R2 in the normal state, when the charge control unit 25 is not controlling them, may be the same.

[0038] For example, a first variable resistor R1 may be connected between the first output terminal OUT1 and the second output terminal OUT2 of the power converter PS. A second variable resistor R2 and a first switch SW_1 may be connected in series between the first output terminal OUT1 and the first input terminal IN_1 of the power converter 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 converter PS. A second switch SW_2 may be connected between the first output terminal OUT1 and the first input terminal IN_1 of the power converter PS.

[0039] The first input terminal IN_1 of the power converter PS may be connected to the positive terminal of the charging unit 21. The second input terminal IN_2 of the power converter PS may be connected to the negative terminal of the charging unit 21. The first output terminal OUT1 of the power converter PS may be connected to the positive terminal of the battery 31. The second output terminal OUT2 of the power converter PS may be connected to the negative terminal of the battery 31.

[0040] The charging unit 21 can supply power to the battery 31 to charge it. The charging unit 21 may also be a power source. For example, the charging unit 21 can supply 800V power or 400V power to the battery 31. As another example, the battery 31 can be charged with 800V power or 400V power.

[0041] The charging communication unit 23 may include a communication module that can communicate with the automotive communication unit 11. For example, while charging is progressing under the control of the charging control unit 25, the charging communication unit 23 can transmit charging data, including information such as the magnitude of the charging current and charging voltage, to the automotive communication unit 11 in real time or at predetermined intervals.

[0042] The charging control unit 25 can control the entire charging process. In this embodiment, the charging control unit 25 can control the switching of multiple switches SW_1 and SW_2 included in the power converter PS. The charging control unit 25 can control the magnitudes of multiple variable resistors R1 and R2 included in the power converter PS.

[0043] The charging control unit 25 can transmit a first switching control signal [SC]_1 to the first switch SW_1 and control the turn-on or turn-off switching of the first switch SW_1. The charging control unit 25 can transmit a second switching control signal [SC]_2 to the second switch SW_2 and control the turn-on or turn-off switching of the second switch SW_2.

[0044] The charging control unit 25 can change the magnitude of the charging current during charging in order to perform various charging methods. In one 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. In one embodiment, the charging control unit 25 can control the magnitudes of the first variable resistor R1 and the second variable resistor R2 in order to match the magnitude of the first voltage, which is the charging voltage of the charging unit 21, with the magnitude of the second voltage, which is the rated voltage of the battery 31.

[0045] Figure 2 is a diagram illustrating an automobile system including a power converter according to another embodiment.

[0046] In Figure 2, the power converter PS is shown outside the battery system 3, but this is not the only option; the power converter PS can also be located inside the battery system 3.

[0047] Each of the vehicle system 1, charging system 2, and battery system 3 shown in Figure 1 can correspond to each of the vehicle system 1, charging system 2, and battery system 3 shown in Figure 2. For example, the multiple components included in each of the vehicle system 1, charging system 2, and battery system 3, and the functions of each of these components, are the same as those described in Figure 1, so a detailed explanation is omitted.

[0048] In one embodiment, the power converter PS shown in Figure 1 is included in the charging system 2, but in another embodiment, the power converter PS shown in Figure 2 may be included in the automobile system 1.

[0049] The vehicle control unit 13 of the vehicle system 1 can control the switching of multiple switches SW_1 and SW_2 included in the power converter PS, and can control the magnitudes of multiple variable resistors R1 and R2 included in the power converter PS. In Figure 2, the power converter PS is shown outside the battery system 3, but it is not limited to this, and the power converter PS can be located inside the battery system 3.

[0050] Figure 3 is a diagram illustrating a charging gender including a power conversion device according to another embodiment.

[0051] Each of the vehicle system 1, charging system 2, and battery system 3 shown in Figure 1 can correspond to each of the vehicle system 1, charging system 2, and battery system 3 shown in Figure 2. For example, the multiple components included in each of the vehicle system 1, charging system 2, and battery system 3, and the functions of each of these components, are the same as those described in Figure 1, so a detailed explanation is omitted.

[0052] In one embodiment, the power converter PS shown in Figure 1 is included in the charging system 2, but in another embodiment, the power converter PS shown in Figure 3 may be included in the charging connector 4 that electrically connects the battery system 3 and the charging system 2.

[0053] The charging gender 4 may be a type of connector that connects the battery system 3 and the charging system 2 for charging the battery 31. Referring to Figure 3, the charging gender 4 may include a power converter PS, a gender communication unit PT, and a gender control unit PC. Here, the components of the power converter PS are the same as those described in Figure 1, so a detailed explanation is omitted.

[0054] The gender communication unit PT may include a communication module that can communicate with the automotive communication unit 11 and the charging communication unit 23. For example, while charging is progressing under the control of the gender control unit PC, the gender communication unit PT can transmit charging data, including information such as the magnitude of the charging current and charging voltage, to the automotive communication unit 11 in real time or at predetermined intervals.

[0055] The gender control unit PC can control the switching of multiple switches SW_1 and SW_2 included in the power converter PS. The gender control unit PC can also control the magnitudes of multiple variable resistors R1 and R2 included in the power converter PS.

[0056] Figure 4 is a flowchart illustrating a battery charging method according to another embodiment.

[0057] Referring to Figure 4, the control unit checks the magnitudes of the first voltage, which is the charging voltage of the charging unit 21, and the second voltage, which is the rated voltage of the battery 31 (S100).

[0058] In one embodiment, if a power converter 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 a second voltage, which is the rated voltage of the battery 31. For example, the charging control unit 25 can receive information regarding the magnitude of the second voltage from the automobile system 1 via the charging communication unit 23.

[0059] In another embodiment, if a power converter PS is included in the automobile system 1, the automobile control unit 13 checks the magnitudes 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 automobile control unit 13 can receive information regarding the magnitude of the first voltage from the charging system 2 via the automobile communication unit 11.

[0060] In another embodiment, if the power converter PS is included in the charging gender 4, the gender control unit PC checks the magnitudes of the first voltage, which is the charging voltage of the charging unit 21, and the second voltage, which is the rated voltage of the battery 31. For example, the gender control unit PC can receive information regarding the magnitude of the first voltage from the charging system 2 via the gender communication unit PT. The gender control unit PC can also receive information regarding the magnitude of the second voltage from the automobile system 1 via the gender communication unit PT.

[0061] Next, the control unit controls multiple switches SW_1 and SW_2 included in the power converter PS to match the magnitude of the first voltage and the magnitude of the second voltage (S200).

[0062] For example, let's assume that the first voltage of the charging unit 21 is 800V and the second voltage of the battery 31 is 400V. Also, let's assume that the default resistance values ​​of the first variable resistor R1 and the second variable resistor R2 are the same.

[0063] According to one embodiment, as shown in Figure 1, the charging control unit 25 can turn on the first switch SW_1. Then, the 800V power output from the charging unit 21 may be changed to 400V power according to the ratio of the resistance values ​​of the first variable resistor R1 and the second variable resistor R2, and supplied to the battery 31.

[0064] In another embodiment, referring to Figure 2, the automobile control unit 13 can turn on the first switch SW_1. 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 and the second variable resistor R2 and supplied to the battery 31.

[0065] In another embodiment, as shown in Figure 3, the gender control unit PC can turn on the first switch SW_1. Subsequently, 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 and the second variable resistor R2 and supplied to the battery 31.

[0066] As another example, let's assume that the first voltage of the charging unit 21 and the second voltage of the battery 31 are both 800V. Also, let's assume that the default values ​​of the first variable resistor R1 and the second variable resistor R2 are the same.

[0067] According to one embodiment, as shown in Figure 1, the charge control unit 25 can turn on the second switch SW_2. Subsequently, the ends of the charge system 2 and the ends of the battery system 3 are connected, and the 800V power output from the charge unit 21 is supplied to the battery 31. That is, the charging power from the charge unit 21 can be supplied to the battery 31 without voltage drop.

[0068] In another embodiment, referring to Figure 2, the automobile control unit 13 can turn on the second switch SW_2. Subsequently, the ends of the charging system 2 and the ends of the battery system 3 are connected, and the 800V power output from the charging unit 21 can be supplied to the battery 31. That is, the charging power from the charging unit 21 can be supplied to the battery 31 without voltage drop.

[0069] In another embodiment, as shown in Figure 3, the gender control unit PC can turn on the second switch SW_2. Subsequently, the ends of the charging system 2 and the ends of the battery system 3 are connected, and the 800V power output from the charging unit 21 can be supplied to the battery 31. That is, the charging power from the charging unit 21 can be supplied to the battery 31 without voltage drop.

[0070] As yet another example, let's assume that the first voltage of the charging unit 21 is 900V and the second voltage of the battery 31 is 300V. The control unit can control the magnitudes of the first variable resistor R1 and the second variable resistor R2.

[0071] According to one embodiment, referring to Figure 1, the charging control unit 25 can control the magnitudes of the first variable resistor R1 and the second variable resistor R2 so that the ratio of the magnitude of the second voltage (300V) to the magnitude of the first voltage (900V) (1 / 3) is equal to the ratio of the first variable resistor R1 to the total magnitude of the multiple variable resistors R1 and R2 connected in series (for example, 100Ω / 100Ω+200Ω)=1 / 3). For example, the charging control unit 25 can control the magnitudes of the first variable resistor R1 and the second variable resistor R2 to be 100Ω and 200Ω, respectively. The charging control unit 25 can also control the turn-on of the first switch SW_1. Subsequently, the 900V power output from the charging unit 21 may be changed to 300V power according to the resistance distribution ratio of the first variable resistor R1 and the second variable resistor R2 and supplied to the battery 31.

[0072] In another embodiment, referring to Figure 2, the vehicle control unit 13 can control the magnitudes of the first variable resistor R1 and the second variable resistor R2 so that the ratio of the magnitude of the second voltage (300V) to the magnitude of the first voltage (900V) (1 / 3) is equal to the ratio of the first variable resistor R1 to the total magnitude of the multiple variable resistors R1 and R2 connected in series (for example, 100Ω / 100Ω+200Ω)=1 / 3). For example, the charging control unit 25 can control the magnitudes of the first variable resistor R1 and the second variable resistor R2 to be 100Ω and 200Ω, respectively. The vehicle control unit 13 can also control the turn-on of the first switch SW_1. Subsequently, the 900V power output from the charging unit 21 may be changed to 300V power according to the resistance distribution ratio of the first variable resistor R1 and the second variable resistor R2 and supplied to the battery 31.

[0073] In another embodiment, referring to Figure 3, the gender control unit PC can control the magnitudes of the first variable resistor R1 and the second variable resistor R2 so that the ratio of the magnitude of the second voltage (300V) to the magnitude of the first voltage (900V) (1 / 3) is equal to the ratio of the first variable resistor R1 to the total magnitude of the multiple variable resistors R1 and R2 connected in series (for example, 100Ω / 100Ω+200Ω) = 1 / 3). For example, the gender control unit PC can control the magnitudes of the first variable resistor R1 and the second variable resistor R2 to be 100Ω and 200Ω, respectively. The gender control unit PC can also control the turn-on of the first switch SW_1. Subsequently, the 900V power output from the charging unit 21 may be changed to 300V power according to the resistance distribution of the first variable resistor R1 and the second variable resistor R2 and supplied to the battery 31.

[0074] Next, the control unit controls the charging of the battery 31 (S300).

[0075] According to one embodiment, as shown in Figure 1, for example, the charging control unit 25 is assumed to charge the battery 31 using a constant-current charging method. 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.

[0076] In another embodiment, referring to Figure 2, it is assumed that the vehicle control unit 13 charges the battery 31 using a constant voltage charging method. 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.

[0077] In another embodiment, referring to Figure 3, it is assumed that the gender control unit PC charges the battery 31 using a constant voltage charging method. The gender control unit PC can control the first variable resistor R1 and the second variable resistor R2 to change the magnitude of the charging current supplied to the battery 31.

[0078] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by persons with ordinary skill in the art to which the present invention belongs also fall within the scope of the present invention.

Claims

1. In a charging system for charging batteries installed in an automobile system, Charging unit that supplies power to the battery, A power conversion circuit includes a first variable resistor connected between the first output terminal and ground, a second variable resistor connected in series between the first output terminal and the first input terminal, and a first switch, which converts the first voltage of the charging section to a second voltage which is the rated voltage of the battery. The system comprises a charging 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, The first input terminal of the power conversion circuit is connected to the positive terminal of the charging unit. A charging system in which the first output terminal of the power conversion circuit is connected to the positive terminal of the battery.

2. The power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal, The charging system according to claim 1, wherein the voltage supplied to the battery when the first switch is turned on and the second switch is turned off is different from the voltage supplied to the battery when the first switch is turned off and the second switch is turned on.

3. The charging control unit is The charging system according to claim 2, wherein when the magnitudes of the first voltage and the second voltage are equal, the first switch is turned off and the second switch is turned on.

4. The charging control unit, The charging system according to claim 3, wherein if the magnitudes of the first voltage and the second voltage are different, the first switch is turned on and the second switch is turned off.

5. The charging control unit, The charging system according to claim 4, wherein the first variable resistor and the second variable resistor are controlled so that their resistances are equal when the magnitude of the first voltage corresponds to twice the magnitude of the second voltage.

6. The charging system according to any one of claims 1 to 5, wherein when the first switch is turned on, a voltage corresponding to the magnitude of the first variable resistor and the magnitude of the second variable resistor is supplied to the battery.

7. In an automotive system that charges the battery using the power of the charging system, A battery system including the aforementioned battery and a BMS for managing the state of the battery, A power conversion circuit includes a first variable resistor connected between a first output terminal and ground, a second variable resistor connected in series between the first output terminal and a first input terminal, and a first switch, which converts a first voltage of power supplied by the charging system to a second voltage which is the rated voltage of the battery. The system comprises an automotive 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, The first input terminal of the power conversion circuit is connected to the positive terminal of the charging system. An automotive system in which the first output terminal of the power conversion circuit is connected to the positive terminal of the battery.

8. The power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal, The automobile system according to claim 7, wherein the voltage supplied to the battery when the first switch is turned on and the second switch is turned off is different from the voltage supplied to the battery when the first switch is turned off and the second switch is turned on.

9. The automobile control unit is The automotive system according to claim 8, wherein when the magnitudes of the first voltage and the second voltage are equal, the first switch performs turn-off control and the second switch performs turn-on control.

10. The aforementioned automobile control unit, The automotive system according to claim 9, wherein when the magnitudes of the first voltage and the second voltage are different, the first switch controls the turn-on and the second switch controls the turn-off.

11. The aforementioned automobile control unit, The automotive system according to claim 10, wherein the first variable resistor and the second variable resistor are controlled so that their resistances are equal when the magnitude of the first voltage corresponds to twice the magnitude of the second voltage.

12. The automobile system according to any one of claims 7 to 11, wherein when the first switch is turned on, a voltage corresponding to the magnitude of the first variable resistor and the magnitude of the second variable resistor is supplied to the battery.

13. In charging gender, where the automotive system and the charging system are electrically connected to charge the battery, A power conversion circuit includes a first variable resistor connected between a first output terminal and ground, a second variable resistor connected in series between the first output terminal and a first input terminal, and a first switch, which converts a first voltage of power supplied by the charging system to a second voltage which is the rated voltage of the battery. The system comprises a gender 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, The first input terminal of the power conversion circuit is connected to the positive terminal of the charging system. The first output terminal of the power conversion circuit is a charging terminal connected to the positive terminal of the battery.

14. The power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal, The charging gender according to claim 13, wherein the voltage supplied to the battery when the first switch is turned on and the second switch is turned off is different from the voltage supplied to the battery when the first switch is turned off and the second switch is turned on.

15. The gender control unit is The charging gender according to claim 14, wherein when the magnitudes of the first voltage and the second voltage are equal, the first switch is turned off and the second switch is turned on.

16. The gender control unit is, The charging gender according to claim 15, wherein if the magnitudes of the first voltage and the second voltage are different, the first switch is turned on and the second switch is turned off.

17. The gender control unit is, The charging gender according to claim 16, wherein the first variable resistor and the second variable resistor are controlled so that their resistances are equal when the magnitude of the first voltage corresponds to twice the magnitude of the second voltage.

18. The charging gender according to any one of claims 13 to 17, wherein when the first switch is turned on, a voltage corresponding to the magnitude of the first variable resistor and the magnitude of the second variable resistor is supplied to the battery.

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