Electric vehicle charging module for generating high output using plurality of low output power modules and driving method of charging module

Abstract

The present invention relates to an electric vehicle charging module for generating a high output using a plurality of low output power modules and a driving method of the charging module. The electric vehicle charging module for generating a high output using a plurality of low output power modules according to an embodiment of the present invention includes: a first conversion circuit unit for converting a positive constant voltage (+VDC) input to a first inverter and a second inverter, respectively, into an AC voltage and AC current and then rectifying the AC voltage and AC current to output a voltage and current of a first power; a second conversion circuit unit for converting a negative constant voltage (-VDC) input to a third inverter and a fourth inverter, respectively, into an AC voltage and AC current and then rectifying the AC voltage and AC current to output a voltage and current of a second power; and a switching circuit unit for outputting a high voltage equal to or higher than a reference voltage and a high current equal to or higher than a reference current using a combination of the voltage and current of the first power and the voltage and current of the second power by operating the first conversion circuit unit and the second conversion circuit unit in series or in parallel.

Description

An electric vehicle charging module that generates high output using a number of low-output power modules and a method for operating the charging module

[0001] The present invention relates to an electric vehicle charging module that generates high output with a plurality of low-output power modules and a method for driving the charging module, and more particularly, to an electric vehicle charging module that generates high output with a plurality of low-output power modules and a method for driving the charging module, which controls the charging module to quickly charge a desired target power by connecting a rectified DC voltage in series and parallel and combining the current and voltage therewith, based on ensuring high output for electric vehicle charging, configures a circuit so as to efficiently generate high output using a plurality of low-output power modules, and distributes the load to a plurality of low-output power modules to minimize heat generation and power consumption at the same time, thereby ensuring the safety of use of the charging module.

[0002] Currently, since the charging voltage and current required by electric vehicles are mostly different, the charging module (CM) must implement various voltage and current supplies when necessary to meet the charging voltage and current requirements of different loads. In the prior art, in order to implement various outputs of the charging module (CM), the voltage and current conversion circuit of the charging module (CM) uses a single conversion method, and by configuring the circuit based on the highest standards for high voltage and high current, it causes serious problems such as heat generation and lowered power usage efficiency, and lowers the performance of the power conversion device, which causes serious problems such as lowered reliability.

[0003] Therefore, the urgent problem that needs to be solved is to distribute the load based on ensuring high output of the charging module (CM), minimize heat generation, and maximize power consumption efficiency to ensure the safety of use of the charging module and electric vehicle.

[0004] The problem to be solved by the present invention is to provide an electric vehicle charging module that generates high output from a plurality of low-power power modules by connecting DC voltage and current provided from a plurality of low-power power modules rectified in a charging module (CM) in series and parallel, and combining the current and voltage to generate and control power in order to increase efficiency in power consumption of the charging module (CM) and to control the target output in various ways and to minimize heat generation, thereby ensuring high output of the charging module (CM) and minimizing heat generation by distributing the load, thereby ensuring the safety of use of the electric vehicle charger, and a method for driving the charging module.

[0005] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0006] An electric vehicle charging module (CM) using a plurality of low-power power modules according to an embodiment of the present invention for solving the above problem is a positive constant voltage (+V) input to each of the first inverter and the second inverter. DC ) to the voltage and current of the alternating current and then rectified to output the voltage and current of the first power, and the negative constant voltage (-V) input to the third inverter and the fourth inverter, respectively. DC ) to AC voltage and current and then rectifies them to output the voltage and rectification of the second power, and a switching circuit unit that operates the first conversion circuit unit and the second conversion circuit unit in series or in parallel to output a high voltage higher than a reference voltage and a high current higher than a reference current based on a combination of the voltage and current of the first power and the voltage and current of the second power.

[0007] The above electric vehicle charging module (CM) further includes a control circuit unit that controls the operation of the first conversion circuit unit, the second conversion circuit unit, and the switching circuit unit, and the voltage and current of the first power output from the first conversion circuit unit and the voltage and current of the second power output from the second conversion circuit unit can have the same value.

[0008] The above control circuit unit can change the voltage of the AC by adjusting the driving frequency of the first inverter to the fourth inverter, and can change the AC current by controlling the first inverter to the fourth inverter through PWM (Pulse Width Modulation).

[0009] The first conversion circuit unit converts the positive constant voltage into the voltage and current of the alternating current through a first transformer (T1) connected to the output terminal of the first inverter and a second transformer (T2) connected to the output terminal of the second inverter, and the second conversion circuit unit can convert the negative constant voltage into the voltage and current of the alternating current through a third transformer (T3) connected to the output terminal of the third inverter and a fourth transformer (T4) connected to the output terminal of the fourth inverter.

[0010] The first conversion circuit unit and the second conversion circuit unit may include two full bridge rectifier circuits for rectifying the voltage and current of the first power and the voltage and current of the second power, respectively, between the first transformer to the fourth transformer and the switching circuit unit.

[0011] In order to solve the above problem, a method for driving an electric vehicle charging module using a plurality of low-power power modules according to an embodiment of the present invention is provided, wherein a positive constant voltage (+V) is input to each of the first inverter and the second inverter constituting the first conversion circuit unit. DC) to the voltage and current of the alternating current and then rectified to output the voltage and current of the first power, and the negative constant voltage (-V) input to the third inverter and the fourth inverter constituting the second conversion circuit unit, respectively DC ) to an alternating voltage and current and then rectified to output the voltage and rectified current of the second power, and a switching circuit unit operates the first conversion circuit unit and the second conversion circuit unit in series or in parallel to output a high voltage higher than a reference voltage and a high current higher than a reference current by a combination of the voltage and current of the first power and the voltage and current of the second power.

[0012] According to an embodiment of the present invention, an electric vehicle charging module (CM) can increase the efficiency of high power production by distributing the load applied to the inverter using a plurality of inverters, and can minimize the heat generated from the inverter. That is, by applying a method of increasing the voltage or increasing the current through a series-parallel combination of rectified DC power obtained through a plurality of low-voltage and low-current inverters, the voltage-current can be effectively controlled to obtain the desired high power.

[0013] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0014] FIG. 1 is a block diagram illustrating the components of an electric vehicle charging module (CM) according to an embodiment of the present invention.

[0015] FIG. 2 is a basic circuit diagram of the electric vehicle charging module (CM) of FIG. 1 according to the first embodiment of the present invention.

[0016] Figure 3 is a flowchart of a charging module (CM) control method according to an embodiment of the present invention.

[0017] FIG. 4 is a flowchart showing the control and driving process of the electric vehicle charging module (CM) of FIG. 2 according to an embodiment of the present invention.

[0018] The present invention is not limited to the embodiments described below, but can be implemented in various different forms. These embodiments are merely illustrative of the contents of the present invention and are provided to provide those skilled in the art with a detailed understanding of the scope of the invention. The present invention is defined solely by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

[0019] Embodiments described herein will be described with reference to cross-sectional and / or plan views, which are ideal examples of the present invention. In the drawings, the illustrated regions are expressed for the effective explanation of the technical contents. Therefore, the regions illustrated in the drawings have a schematic nature, and the shapes of the regions illustrated in the drawings are intended to illustrate specific forms of the device regions and are not intended to limit the scope of the invention. Although terms such as first, second, and third are used to describe various components in various embodiments of the present specification, these components should not be limited by such terms. These terms are used only to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

[0020] The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise. As used herein, the terms "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, operations, and / or elements to the mentioned components, steps, operations, and / or elements.

[0021] Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in their common sense to those of ordinary skill in the art to which the present invention pertains. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0022] Hereinafter, with reference to the drawings, the concept of the present invention and embodiments thereof will be described in detail.

[0023] FIG. 1 is a block diagram illustrating the basic structure of an electric vehicle charging module (CM) according to an embodiment of the present invention, and FIG. 2 is a basic circuit diagram of the electric vehicle charging module (CM) of FIG. 1 according to a first embodiment of the present invention.

[0024] As illustrated in FIG. 1, an electric vehicle charging module (100) according to an embodiment of the present invention may be configured between a DC power supply device and a load where charging is performed, as a charging module that combines, for example, rectified DC voltages in series and parallel, and may include part or all of a first conversion circuit unit (or first PWM (CM) device) (110), a second conversion circuit unit (or second PWM device) (120), and a switching circuit unit (130), and may further include a control circuit unit (140) including a processor (processor) such as a CPU or MPU.

[0025] Here, “including some or all” means that when an electric vehicle charging module (100) is configured to include N conversion circuits (e.g., PWM devices), at least one conversion circuit may be omitted to configure the electric vehicle charging module (100) to obtain a desired target voltage or current, or some components such as a switching circuit (130) may be integrated into the first conversion circuit (110) or the second conversion circuit (120), etc. In order to help a sufficient understanding of the invention, it is described as including all.

[0026] In the embodiment of the present invention, since it is intended to explain a series-parallel combination, it is assumed that the combination is comprised of two parts, namely, a first conversion circuit unit (110) and a second conversion circuit unit (120) composed of a PWM (Pulse Width Modulation) device, etc. Of course, it is not intended to be particularly limited to such a configuration.

[0027] The first conversion circuit (110) of Fig. 1 can receive DC voltage from an external DC power supply, for example. More precisely, a positive constant voltage (+V DC ) can be provided. Typically, electric vehicles can be charged by converting commercial power, for example, commercial power of 110V or 220V is rectified using various types of rectifiers such as half-wave rectifiers or full-wave rectifiers, and then the rectified voltage including ripple current is converted into a voltage without ripple current through a smoothing circuit, thereby obtaining a stable and constant level of DC voltage. Smoothing circuits are often used, such as circuits that use capacitors (C). Of course, the DC power supply can obtain a DC voltage of a desired level by leveling up or pumping up the smoothed DC voltage through a DC-DC converter or a pumping up circuit in the process, or by leveling down the level.

[0028] More specifically, in FIG. 2, the first conversion circuit unit (110) may be configured to include first and second DC-AC inverters (111), first and second transformers (113), and a rectifier circuit unit (115). The DC-AC inverters (111) and the transformers (113) may each be configured to be two. These may be named in the form of a first inverter and a second inverter, and a first tap transformer and a second transformer. The DC-AC inverter (111) may convert the input DC voltage (or positive constant voltage) into an AC voltage or current, more precisely, an AC voltage or current (e.g., a discontinuous AC voltage), and provide the converted voltage or current to the transformer (113), and the transformer (113) may convert the voltage input to the primary coil and output (+) and (-) power through the secondary coil. Of course, the control operation of the inverter may be controlled according to a preset method of an external control circuit unit such as a CPU. The control circuit can change the AC voltage by adjusting the driving frequency of the inverter, and can also change the AC current through PWM control. In the case of the transformer (113), since it has two intermediate outputs on the secondary side, it can appropriately distribute the distribution power generated from the inverter. For example, the PWM controller that constitutes the inverter includes the first to fourth switching elements configured in the form of a full bridge, and thus can control them to convert the input voltage into an AC voltage and output it. Here, various elements such as a MOS FET (Metal Oxide Semiconductor Field Effect Transistor) or an IGBT element can be used as the switching element.

[0029] In the case of the second conversion circuit (120), the internal configuration is not significantly different from that of the first conversion circuit (110). In other words, the second conversion circuit (120) has a negative constant voltage (-V) of the same magnitude as that of the first conversion circuit (110). DC) That is, the second DC voltage can be simultaneously provided from an external DC power supply, and the input second DC voltage can be converted through the third and fourth DC-AC inverters (121), respectively, to output voltage or current in AC form, respectively. Of course, each output voltage can also be named as a third output voltage, a fourth output voltage, or a voltage or current having second power. And the AC form voltage output through each DC-AC inverter (121) can be input to the primary coils of the third and fourth transformers (123), respectively, and converted and output through the secondary coil. Of course, the output voltage (V2) compared to the input voltage (V1) is proportional to the number of turns (N1:N2) of the coil.

[0030] In summary, the inverters (111, 121) included in the first conversion circuit unit (110) and the second conversion circuit unit (120) according to the embodiment of the present invention are configured as a full bridge circuit, and each module can change the frequency or receive a PWM signal to generate an AC voltage and current through a transformer of the LLC resonant circuit. It operates by configuring two inverters that operate by receiving (+) direct current power and two inverters that operate by receiving (-) direct current power. The power generated by the positive (+) and (-) power sources can be paired and operated. Each inverter can supply a maximum voltage of 500 V and a current of 30 A (for example, the maximum voltage and current can be designed and changed as much as necessary depending on the target power to be used). The voltage can be changed by the driving frequency, and the current can be controlled by PWM to generate the target power. Here, PWM can mean controlling the duty ratio of the switch's on-off operation. Of course, the total on-off time (T) is constant, and the duty ratio can be seen as being controlled within that time.

[0031] In addition, the transformer (113, 123), i.e., the transformer, operates to distribute and supply high-frequency AC power generated from each inverter (111, 121) to the secondary side. The primary side of the transformer may apply a resonant circuit composed of an inductance (L), a capacitance (C), and L of a transformer (Trans). The secondary side has two identical output coils and is used to appropriately distribute the distributed power generated from the inverter (111, 121) for combination with each inverter (111, 121).

[0032] The rectifier circuit (115) is configured between the output terminals of the first to fourth transformers (113, 123) and the switching circuit (130) of FIG. 1. It can output a rectified current or voltage for the voltage or current output through the first to fourth transformers (113, 123), respectively. The rectifier circuit (115) can be configured to include rectifier diodes, and each diode can be configured as a bridge diode. Two types of power generation groups composed of D1, D2, and D3 and D4 can be formed. In an embodiment of the present invention, the power generated by each rectifier diode group can supply a maximum voltage of 500 V and a maximum current of 30 A, respectively (e.g., a maximum of 15 KW). In an embodiment of the present invention, D1, D2, D3, and D4 can be referred to as a first diode group (or a first group of diodes) to a fourth diode group, respectively.

[0033] As seen in Fig. 2, the rectifier circuit (115) according to the embodiment of the present invention is composed of first to fourth diode groups. The first diode group (D1) is connected to the secondary-side third terminal (113a) of the first transformer (T1), and the (+) voltage is also connected to the (+) voltage terminal constituting the second diode group (D2), and is connected to the (+) voltage of the first diode constituting the third diode group (D3) and the first diode group constituting the fourth diode group (D4) through the first switching element (e.g., relay element) (131).

[0034] On the other hand, the other AC input terminal of the first diode group (D1) is connected to terminal 6 of the second transformer (T2), and the (-) voltage is connected to the (-) voltage constituting the second diode group (D2), and also to the second diode constituting the third diode group (D3) and the - voltage constituting the fourth diode group (D4) via the third switching element (133), and is connected to the output terminal side (GND-OUT).

[0035] In addition, the AC input terminal constituting the second diode group (D2) is connected to the third terminal (123a) of the third transformer (T3), and the other AC input terminals are respectively connected to the sixth terminal of the fourth transformer (T4). The AC input terminal constituting the third diode group (D3) is respectively connected to the fifth terminal of the first transformer (T1), and the AC input terminals thereof are respectively connected to the fourth terminal of the second transformer (T2). The AC input terminal constituting the fourth diode group (D4) is respectively connected to the fifth terminal of the third transformer (T3), and the AC input terminals of the second diode group are respectively connected to the fourth terminal of the fourth transformer (T4). And, the (-) voltage constituting the second diode group (D2) and the (-) voltage constituting the third diode group (D3) are connected to each other by the second switching element (132), and the (-) voltage constituting the second diode group (D2) is also connected to the (-) voltage constituting the first diode group (D1), and the (-) voltage constituting the third diode group (D3) is also connected to the - voltage constituting the fourth diode group (D4).

[0036] In addition, the third terminal (113b) of the second transformer (T2) is connected to the sixth terminal of the first transformer (T1), and the third terminal (123b) of the fourth transformer (T4) is connected to the sixth terminal of the third transformer (T3). Hereinafter, the specific connection relationship between the first transformer (T1) to the fourth transformer (T4) will be replaced with the content illustrated in Fig. 2.

[0037] Meanwhile, the switching circuit unit (130; 131 to 133) according to an embodiment of the present invention electrically or circuitally connects the first conversion circuit unit (110) and the second conversion circuit unit (120) to each other, and can perform an operation to output currents or voltages output through the rectifier circuit unit (115) in combination, for example. In other words, the switching circuit units (130; 131 to 133) can be viewed as being controlled according to a preset method of a control circuit unit such as a CPU to output voltages or currents output through the rectifier circuit unit (115) in series or in parallel. For example, if a voltage of a maximum voltage of 500 V is output, charging with a high current is possible, and in the case of an electric vehicle requiring a voltage of 1,000 V, charging with a low current can be possible through a series connection.

[0038] In this way, the switching circuit (130; 131 to 133) is controlled by the control operation of the control circuit and can output currents or voltages of various specifications.

[0039] The switching circuit unit (130; 131 to 133) may be configured to include relay elements since high voltage and high current are used. Of course, multiple relay elements (131 to 133) may be used as the relay elements, as shown in FIG. 2. FIG. 2 shows three relay elements (131 to 133) configured between the two terminals constituting the output stage. The role of the relay is to configure a series-parallel circuit to control each DC voltage and current generated by the inverter. A total of three relays (RLY 1A, RLA 2A, RLY 3A) are used to configure the series-parallel circuit. By controlling the contacts of these relays to configure a series-parallel circuit of the previously output DC power, effective high voltage and high current are generated. The generated high voltage and high current can be expressed as in . High voltage and high current can mean voltage and current exceeding the reference value (voltage and current that can be supplied by a small-power power module).

[0040] Structure RLY 1 ARLY 2 ARLY 3 A Output power (maximum) Parallel Off On On 500 V, 120 A Series On Off Off 1000 V, 60 A

[0041] As seen in FIG. 2, in the electric vehicle charging module (100) according to the embodiment of the present invention, the first to third switching elements, i.e., relay elements, operate in parallel when REALY 1A, i.e., the second switching element (132) is opened and, instead, RELAY 2A and RELAY 3A, i.e., the first switching element (131) and the third switching element (133) are turned on, and thus, a voltage and current of 500 V and 120 A can be output from the output terminal, respectively. On the other hand, when the first switching element (131) and the third switching element (133) are turned off and opened and, instead, the second switching element (132) is turned on, a series operation is performed, and through this, a high voltage and high current of up to 1000 V and 60 A can be output through the output terminal, as shown in . Of course, the above combinations can be combined and changed in any way depending on the target charging power.

[0042] A charging module (CM) according to an embodiment of the present invention focuses on minimizing heat generation for a load by using a DC power supply device as (+) and (-) power. By distributing the load applied to the inverter by using a plurality of inverters, the efficiency of the power used is increased, and a circuit that can minimize heat generation from the inverter is configured. In other words, it can be seen that a circuit is applied that can effectively control voltage and current to obtain a target power by applying a method of increasing the voltage or increasing the current through a series-parallel combination of rectified DC power obtained through inverters with low voltage and low current below the standard. Therefore, it is entirely possible to design an expanded structure in the present invention by connecting N such structures and controlling relays to obtain a desired maximum output power.

[0043] FIG. 3 is a basic flowchart of a charging module (100) according to an embodiment of the present invention, and FIG. 4 is a flowchart of an operation process of a charging control method of a charging module (100) according to an embodiment of the present invention.

[0044] Fig. 3 is a basic configuration flow diagram of a charging module (100) control device according to an embodiment of the present invention. As illustrated in Fig. 3, a charging control device according to an embodiment of the present invention, such as a control circuit unit, may be configured to include a target value securing unit (or acquisition unit) (200), a target value confirmation unit (or confirmation unit) (210), and a target value control unit (or control unit) (220).

[0045] Here, the target value securing unit (or acquisition unit) (200), the target value confirmation unit (or confirmation unit) (210), and the target value control unit (or control unit) (220) may be configured in hardware (H / W), software (S / W), or a combination thereof.

[0046] The acquisition unit (200) can perform an operation to acquire a target output value. The determination unit (210) is used to determine the target output value and, based on the charging target output value, determine the target operation mode of the charging module. Here, the target operation mode is a serial mode or a parallel mode.

[0047] The control unit (220) controls to distribute appropriate power to the DC-AC inverter among the charging modules according to the target operation mode, and controls various relays accordingly so that the charging module charges the target output load in the target operation mode.

[0048] FIG. 4 is a flowchart showing the driving process of the electric vehicle charging module of FIG. 1 according to an embodiment of the present invention.

[0049] For convenience of explanation, referring to FIG. 4 together with FIG. 1 and FIG. 2, a charging module (100) according to an embodiment of the present invention uses a rectifier circuit that can simultaneously obtain (+) and (-) power when rectifying an input three-phase alternating current to generate and supply (+) and (-) direct current. The positive constant voltage input to the first inverter and the second inverter constituting the first conversion circuit unit (110) is converted into an alternating voltage and current, respectively, and then rectified to output the voltage and current of the first power (S300). In the embodiment of the present invention, in order to solve the heat generation problem, the first inverter and the second inverter may be operated using a low voltage and low current below a standard to output the rectified first power.

[0050] In addition, the second conversion circuit (120) of the electric vehicle charging module (100) inputs a negative constant voltage (-V) to the third inverter and the fourth inverter constituting the second conversion circuit (120). DC ) can be converted into AC voltage and current and then rectified to output the voltage and rectification of the second power (S310). In the case of the second conversion circuit unit (120), the third inverter and the fourth inverter using a low voltage and low current below the standard can be operated to output the rectified second power.

[0051] Furthermore, the switching circuit unit (130) constituting the electric vehicle charging module (100) operates by an external control signal provided by a control circuit unit such as a CPU, and operates the first conversion circuit unit (110) and the second conversion circuit unit (120) in series or in parallel to output a high voltage higher than the reference voltage and a high current higher than the reference current by combining the voltage and current of the first power and the voltage and current of the second power (S320). The switching circuit unit (130) can increase the output voltage or output current by operating the first power and the second power, which are each output, in series or in parallel. In the embodiment of the present invention, as seen in , when combined in parallel, the maximum output power may be a maximum voltage of 500 V and a maximum current of 120 A, and when combined in series, the maximum output power may be a maximum voltage of 1000 V and a maximum current of 60 A.

[0052] In addition to the above, the electric vehicle charging module (100) of FIG. 1 can perform various operations, and other detailed information has been sufficiently explained above, so it will be replaced with that information.

[0053] Meanwhile, even though all components constituting the embodiments of the present invention have been described as being combined or operating in combination, the present invention is not necessarily limited to such embodiments. That is, within the scope of the purpose of the present invention, all of the components may be selectively combined and operated one or more times. In addition, although all of the components may be implemented as individual independent hardware, some or all of the components may be selectively combined and implemented as a computer program having program modules that perform some or all of the functions of the combined hardware in one or more pieces. The codes and code segments constituting the computer program can be easily inferred by those skilled in the art of the present invention. Such a computer program may be stored in a non-transitory computer-readable storage medium and read and executed by a computer, thereby implementing the embodiments of the present invention.

[0054] Here, the non-transitory readable storage medium refers to a medium that permanently stores data and can be read by a device, rather than a medium that stores data for a short period of time, such as a register, cache, or memory. Specifically, the above-described programs may be stored and provided on a non-transitory readable storage medium, such as a CD, DVD, hard disk, Blu-ray disc, USB, memory card, or ROM.

[0055] Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and various modifications may be made by those skilled in the art without departing from the spirit or scope of the present invention as claimed in the claims. Furthermore, such modifications should not be understood individually from the technical idea or prospect of the present invention.

Claims

1. Positive constant voltage (+V) input to the first and second inverters respectively DC ) into alternating voltage and current, and then rectifies the converted voltage and current to output the first power voltage and current; Negative constant voltage (-V) input to the third and fourth inverters respectively DC ) into AC voltage and current, and then rectifies the converted current and outputs the voltage and rectified current of the second power; and A switching circuit section that operates the first conversion circuit section and the second conversion circuit section in series or in parallel to output a high voltage higher than the reference voltage and a high current higher than the reference current by a combination of the voltage and current of the first power and the voltage and current of the second power; An electric vehicle charging module (CM) that creates high output with a number of low-output power modules.

2. In paragraph 1, It further includes a control circuit unit that controls the operation of the first conversion circuit unit, the second conversion circuit unit, and the switching circuit unit; The voltage and current of the first power output from the first conversion circuit section and the voltage and current of the second power output from the second conversion circuit section have the same value, An electric vehicle charging module that creates high output with a plurality of low-output power modules, wherein the control circuit changes the voltage of the AC by adjusting the driving frequency of the first to fourth inverters, and changes the AC current by controlling the first to fourth inverters through PWM (Pulse Width Modulation).

3. In paragraph 1, The above first conversion circuit section converts the positive constant voltage into the voltage and current of the alternating current through a first transformer (T1) connected to the output terminal of the first inverter and a second transformer (T2) connected to the output terminal of the second inverter. The second conversion circuit section converts the negative constant voltage into the alternating current voltage and current through a third transformer (T3) connected to the output terminal of the third inverter and a fourth transformer (T4) connected to the output terminal of the fourth inverter, and is an electric vehicle charging module that creates high output with a plurality of small-output power modules.

Images