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 APPLICATIONS] 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 documents of this Korean patent application are incorporated herein by reference.

[0002] The present invention relates to an automotive system including a power conversion device, a charging system, and a charging gender. [Background technology]

[0003] As electric vehicles become more commonplace, charging systems for charging electric vehicle batteries are also becoming more widespread. However, the rated power of batteries varies depending on the type and brand of electric vehicles. Furthermore, the charging power varies depending on the type and brand of charging system. Drivers have to inconveniently search for a charging system that matches the specifications of the battery installed in their vehicle. This has been pointed out as a problem that discourages consumers from purchasing electric vehicles. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides an automobile system, a charging system, and a charging gender that allow batteries to be easily charged between battery systems having batteries with different rated voltages and charging systems with different 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 on 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 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 into a second voltage that 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, 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.

[0006] The power conversion circuit may further include 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 be turned off and the second switch to be turned on when the magnitudes of the first voltage and the second voltage are equal.

[0007] The charge control unit may be configured to turn on the first switch and turn off the second switch when the magnitude of the first voltage is different from the magnitude of the second voltage.

[0008] The charge control unit may control the first variable resistor and the second variable resistor so that their resistance values ​​are equal when the magnitude of the first voltage and the magnitude of the second voltage correspond to each other by two times.

[0009] Another feature of the present invention is an automobile system that charges a battery with power from a charging system, and includes: a battery system including the battery and a BMS (Battery Management System) that manages the state of the battery; a power conversion circuit including 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, and that converts a first voltage of the power supplied by the charging system into a second voltage that is a driving voltage of the battery; and an automobile 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.

[0010] The power conversion circuit may further include 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 be configured to turn on the first switch and turn off the second switch when the magnitude of the first voltage is different from the magnitude of the second voltage.

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

[0013] According to another aspect of the present invention, there is provided a charging gender that electrically connects an automobile system and a charging system to charge a battery, the charging gender including 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 power supplied by the charging system into a second voltage that is a driving 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, the first input terminal of the power conversion circuit being connected to the positive terminal of the charging system and the first output terminal of the power conversion circuit being connected to the positive terminal of the battery.

[0014] The power conversion circuit may further include 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 be turned off and the second switch to be turned on when the magnitudes of the first voltage and the second voltage are equal.

[0015] The gender control unit may be configured to turn on the first switch and turn off the second switch when the magnitude of the first voltage is different from the magnitude of the second voltage.

[0016] The gender control unit may control the first variable resistor and the second variable resistor so that their resistance values ​​are equal when the magnitude of the first voltage and the magnitude of the second voltage correspond to each other by two times. [Effects of the Invention]

[0017] According to an embodiment of the present invention, by providing a shared charging system, a shared vehicle system, or a shared charging gender, batteries can be easily charged between battery systems having batteries with different rated voltages and charging systems with different charging voltages.

[0018] According to the embodiment 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 an embodiment of the present invention, there is no need to provide multiple charging systems corresponding to the rated voltages of multiple batteries, and it is possible to charge the batteries of various electric vehicles with just one charging system, thereby reducing costs. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a diagram illustrating a charging system including a power conversion device according to an embodiment; [Figure 2] 10 is a diagram illustrating an automobile system including a power conversion device according to another embodiment. [Figure 3] 10 is a diagram illustrating a charging gender including a power conversion device according to another embodiment. [Figure 4] 10 is a flowchart illustrating a battery charging method according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Identical or similar components will be designated by the same reference numerals, and redundant descriptions will be omitted. The suffixes "module" and / or "section" used in the following description are used solely for ease of description and do not have any distinct meanings or functions. Furthermore, when describing the embodiments disclosed herein, detailed descriptions of related prior art will be omitted if it is deemed that such descriptions may obscure the gist of the embodiments disclosed herein. Furthermore, the accompanying drawings are intended to facilitate understanding of the embodiments disclosed herein, and the technical concepts disclosed herein should not be limited by the accompanying drawings. The accompanying drawings should be understood to include all modifications, equivalents, or alternatives within the spirit and scope of the present invention.

[0022] Terms including ordinal numbers such as first, second, etc. may be used to describe various components, but the components are not limited to those terms. The terms are used only to distinguish one component from another.

[0023] When a component is referred to as being "coupled" or "connected" to another component, it should be understood that the component may be directly coupled or connected to the other component, but that there may be other components in between. On the other hand, when a component is referred to as being "directly coupled" or "directly connected" to another component, it should be understood that there are no other components in between.

[0024] In this application, terms such as "comprise" or "have" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are understood not to preclude the possible presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

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

[0026] 1, the automobile system 1 may be a host system in which the battery system 3 is mounted. However, the embodiment is not limited to the automobile system 1, and may be applied to various host systems in which the battery system 3 is mounted.

[0027] The automobile system 1 includes an automobile communication unit 11 and an automobile control unit 13 .

[0028] 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 33 of the battery system 3. For example, the vehicle communication unit 11 may 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 in the battery system 3 to the battery communication unit 33. As another example, the vehicle communication unit 11 may receive various data collected in 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.

[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 each of the charging system 2 and the battery system 3 and transmit control signals to each of the charging system 2 and the battery system 3 so that charging can be carried out smoothly.

[0030] The battery system 3 may be a power supply 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 (hereinafter referred to as "BMS") .

[0031] The battery 31 may include a plurality of 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 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, or a predetermined number of battery packs may be connected in parallel to form a battery bank, all of which may supply a desired amount of power. While FIG. 1 illustrates the battery 31 having a plurality of battery cells connected in series, the battery 31 may be configured as a battery module, a battery pack, or a battery bank.

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

[0033] The battery communication unit 33 may include a communication module capable of communicating with the automobile communication unit 11. For example, the battery communication unit 33 may transmit battery data including information about the state of the battery to the automobile system 1 under the control of the BMS 35. As another example, the battery communication unit 33 may receive various control signals from the automobile system 1.

[0034] The BMS 35 can manage and control the entire battery system 3. In the process of charging the battery 31 with power from the charging system 2, the BMS 35 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 conversion device PS, a charging unit 21 , a charging communication unit 23 , and a charging control unit 25 .

[0036] The power converter PS includes a circuit for converting 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. According to one embodiment, referring to FIG.

[0037] 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 embodiment, the first variable resistor R1 and the second variable resistor R2 may have the same default value in a normal state where they are not controlled by the charging control unit 25.

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

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

[0040] The charging unit 21 can supply power to the battery 31 to charge the battery 31. The charging unit 21 may 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 capable of communicating with the vehicle communication unit 11. For example, while charging is in progress under the control of the charging control unit 25, the charging communication unit 23 may transmit charging data including information such as the magnitude of the charging current and the charging voltage to the vehicle communication unit 11 in real time or at predetermined intervals.

[0042] The charging control unit 25 can control the overall charging process. According to an embodiment, the charging control unit 25 can control the switching of a plurality of switches SW_1 and SW_2 included in the power conversion device PS. The charging control unit 25 can control the magnitudes of a plurality of variable resistors R1 and R2 included in the power conversion device PS.

[0043] The charging control unit 25 may transmit a first switching control signal [SC]_1 to the first switch SW_1 to control the turn-on or turn-off switching of the first switch SW_1, and may transmit a second switching control signal [SC]_2 to the second switch SW_2 to 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 to implement various charging methods. According to an 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 embodiment, the charging control unit 25 can control the magnitudes of the first variable resistor R1 and the second variable resistor R2 to match the magnitude of the first voltage, which is the charging voltage of the charging unit 21, and the magnitude of the second voltage, which is the rated voltage of the battery 31.

[0045] FIG. 2 is a diagram illustrating an automobile system including a power conversion device according to another embodiment.

[0046] In FIG. 2, the power converter PS is illustrated as being outside the battery system 3, but this is not limiting and the power converter PS can be located inside the battery system 3.

[0047] The automobile system 1, the charging system 2, and the battery system 3 illustrated in Fig. 1 may correspond to the automobile system 1, the charging system 2, and the battery system 3 illustrated in Fig. 2. For example, the components and functions of each of the components included in the automobile system 1, the charging system 2, and the battery system 3 are the same as those described in Fig. 1, and therefore detailed description thereof will be omitted.

[0048] According to one embodiment, the power converter PS of FIG. 1 is included in the charging system 2, but according to another embodiment, the power converter PS of FIG.

[0049] The automobile control unit 13 of the automobile system 1 controls the switching of a plurality of switches SW_1 and SW_2 included in the power conversion device PS, and can control the magnitudes of a plurality of variable resistors R1 and R2 included in the power conversion device PS. In Fig. 2, the power conversion device PS is illustrated outside the battery system 3, but this is not limited thereto, and the power conversion device PS can be located inside the battery system 3.

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

[0051] The automobile system 1, the charging system 2, and the battery system 3 illustrated in Fig. 1 may correspond to the automobile system 1, the charging system 2, and the battery system 3 illustrated in Fig. 2. For example, the components and functions of each of the components included in the automobile system 1, the charging system 2, and the battery system 3 are the same as those described in Fig. 1, and therefore detailed description thereof will be omitted.

[0052] According to one embodiment, the power conversion device PS of FIG. 1 is included in the charging system 2, but according to another embodiment, the power conversion device PS of FIG. 3 may be included in the charging gender 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 Fig. 3, the charging gender 4 may include a power converter PS, a gender communication unit PT, and a gender control unit PC. Here, each configuration of the power converter PS is the same as that described in Fig. 1, so detailed description will be omitted.

[0054] The gender 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, while charging is in progress under the control of the gender control unit PC, the gender communication unit PT may transmit charging data, including information such as the magnitude of the charging current and charging voltage, to the vehicle communication unit 11 in real time or at predetermined intervals.

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

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

[0057] Referring to FIG. 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] According to one embodiment, when the power conversion device PS is included in the charging system 2, the charging control unit 25 checks the magnitude 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 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] According to another embodiment, when the power conversion device PS is included in the automobile system 1, the automobile control unit 13 checks the magnitude 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 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] According to another embodiment, when the power conversion device PS is included in the charging system 4, the gender control unit PC checks the magnitude 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 about the magnitude of the first voltage from the charging system 2 via the gender communication unit PT. In addition, the gender control unit PC can receive information about the magnitude of the second voltage from the automobile system 1 via the gender communication unit PT.

[0061] Next, the control unit controls the plurality of switches SW_1 and SW_2 included in the power conversion device PS to make the magnitude of the first voltage equal to the magnitude of the second voltage (S200).

[0062] 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. It is also assumed that the first variable resistor R1 and the second variable resistor R2 have the same default resistance value.

[0063] 1, according to one embodiment, the charging control unit 25 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 resistance values ​​of the first variable resistor R1 and the second variable resistor R2, and may be supplied to the battery 31.

[0064] 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 converted 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] 3, the gender control unit PC can turn on the first switch SW_1. The 800V power output from the charging unit 21 can be converted 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, it is assumed that the first voltage of the charging unit 21 and the second voltage of the battery 31 are both 800 V. It is also assumed that the first variable resistor R1 and the second variable resistor R2 have the same default value.

[0067] 1, according to one embodiment, the charging control unit 25 can control the second switch SW_2 to be turned on. Hereinafter, both ends of the charging system 2 and both ends of the battery system 3 may be connected, and the 800V power output from the charging unit 21 may be supplied to the battery 31. That is, the charging power of the charging unit 21 can be supplied to the battery 31 without a voltage drop.

[0068] 2, according to another embodiment, 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 both 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 of the charging unit 21 can be supplied to the battery 31 without a voltage drop.

[0069] 3, according to another embodiment, the gender control unit PC can control the second switch SW_2 to be turned on. Then, both ends of the charging system 2 and both 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. In other words, the charging power of the charging unit 21 can be supplied to the battery 31 without a voltage drop.

[0070] As yet another example, 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 FIG. 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 (1 / 3) of the magnitude of the second voltage (300 V) to the magnitude of the first voltage (900 V) is equal to the ratio of the first variable resistor R1 to the total magnitude of the series-connected multiple variable resistors R1 and R2 (e.g., 100 Ω / 100 Ω+200 Ω) = 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 100 Ω and 200 Ω, respectively. The charging control unit 25 can also turn on the first switch SW_1. Hereinafter, the 900 V power output from the charging unit 21 may be converted to 300 V power according to the resistance division 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 FIG. 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 (1 / 3) of the magnitude of the second voltage (300 V) to the magnitude of the first voltage (900 V) is equal to the ratio of the magnitude of the first variable resistor R1 to the total magnitude of the series-connected multiple variable resistors R1 and R2 (e.g., 100 Ω / 100 Ω+200 Ω) = 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 100 Ω and 200 Ω, respectively. The vehicle control unit 13 can also control the first switch SW_1 to be turned on. Hereinafter, the 900 V power output from the charging unit 21 may be converted to 300 V power according to the resistance division 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 FIG. 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 (1 / 3) of the magnitude of the second voltage (300V) to the magnitude of the first voltage (900V) is equal to the ratio of the first variable resistor R1 to the total magnitude of the series-connected multiple variable resistors R1 and R2 (e.g., 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 first switch SW_1 to turn on. Hereinafter, the 900V power output from the charging unit 21 may be converted to 300V power according to the resistance division of the first variable resistor R1 and the second variable resistor R2 and supplied to the battery 31.

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

[0075] 1, it is assumed that the charging control unit 25 charges the battery 31 using a constant-current charging method. The charging control unit 25 controls the first variable resistor R1 and the second variable resistor R2 to change the magnitude of the charging current supplied to the battery 31.

[0076] 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 controls the first variable resistor R1 and the second variable resistor R2 to change the magnitude of the charging current supplied to the battery 31.

[0077] 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 controls 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 the 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 made by those skilled in the art to which the present invention pertains also fall within the scope of the present invention.

Claims

1. In a charging system for charging a battery mounted on an automobile system, a charging unit that supplies power to the battery; a power conversion circuit including a first variable resistor connected between a first output terminal and a ground, a second variable resistor connected in series between the first output terminal and a first input terminal, and a first switch, for converting a first voltage of the charging unit into a second voltage that is a rated voltage of the battery; a charge control unit that controls a switching operation of the first switch, a magnitude of the first variable resistor, and a magnitude of the second variable resistor; the first input terminal of the power conversion circuit is connected to the positive electrode of the charging unit; The first output terminal of the power conversion circuit is connected to the positive electrode 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 control unit 2. The charging system of claim 1, wherein when the first voltage and the second voltage are equal in magnitude, the first switch is controlled to turn off and the second switch is controlled to turn on.

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

4. The charging control unit 4. The charging system according to claim 3, wherein the first variable resistor and the second variable resistor are controlled so that their resistance values ​​are equal when the magnitude of the second voltage is twice as large as the magnitude of the first voltage.

5. In an automobile system that charges a battery using power from a charging system, a battery system including the battery and a BMS that manages the state of the battery; a power conversion circuit including a first variable resistor connected between a first output terminal and a ground, a second variable resistor connected in series between the first output terminal and a first input terminal, and a first switch, for converting a first voltage of power supplied by the charging system into a second voltage that is a rated voltage of the battery; an automobile control unit that controls a switching operation of the first switch, a magnitude of the first variable resistor, and a 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 connected to the positive terminal of the battery.

6. the power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal; The automobile control unit 6. The automotive system of claim 5, wherein when the magnitudes of the first voltage and the second voltage are equal, the first switch is controlled to turn off and the second switch is controlled to turn on.

7. The automobile control unit 7. The automobile system according to claim 6, wherein when the magnitude of the first voltage and the magnitude of the second voltage are different, the first switch is controlled to be turned on and the second switch is controlled to be turned off.

8. The automobile control unit 8. The automobile system according to claim 7, wherein the first variable resistor and the second variable resistor are controlled so that their resistance values ​​are equal when the magnitude of the second voltage is twice as large as the magnitude of the first voltage.

9. In a charging gender that electrically connects an automobile system and a charging system to charge a battery, a power conversion circuit including a first variable resistor connected between a first output terminal and a ground, a second variable resistor connected in series between the first output terminal and a first input terminal, and a first switch, for converting a first voltage of power supplied by the charging system into a second voltage that is a rated voltage of the battery; a gender control unit that controls a switching operation of the first switch, a magnitude of the first variable resistor, and a 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 connected to the positive electrode of the battery.

10. the power conversion circuit further includes a second switch connected between the first output terminal and the first input terminal; The gender control unit 10. The charging gender of claim 9, wherein when the magnitudes of the first voltage and the second voltage are equal, the first switch is controlled to turn off and the second switch is controlled to turn on.

11. The gender control unit The charging gender of claim 10 , wherein when the magnitude of the first voltage and the magnitude of the second voltage are different, the first switch is controlled to be turned on and the second switch is controlled to be turned off.

12. The gender control unit The charging gender of claim 11, wherein the first variable resistor and the second variable resistor are controlled so that their resistance values ​​are equal when the magnitude of the second voltage is twice as large as the magnitude of the first voltage.

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