KR20210010223A - Output power control system and method for charging pile of electric vehicle - Google Patents

Abstract

The present invention relates to an electric vehicle charging pile output power control system. According to the present invention, the electric vehicle charging pile output power control system comprises: a power supply unit; a plurality of charging piles receiving power from the power supply unit and respectively charging batteries of an electric vehicle; an output power input unit for inputting output power for charging the electric vehicle battery; a plurality of changeover switches for converting the power supplied from the power supply unit to any one of the plurality of charging piles; and a central controller which controls the plurality of changeover switches according to the output power input by the output power input unit to vary the output power of the charging pile that can be charged. Accordingly, the maximum output power of a charger may be varied by switching the power charged in a plurality of charging module assemblies to any one of the plurality of charging piles by controlling the plurality of changeover switches.

Description

Electric vehicle charging pile output power control system and method {OUTPUT POWER CONTROL SYSTEM AND METHOD FOR CHARGING PILE OF ELECTRIC VEHICLE}

The present invention relates to an electric vehicle charging pile output power control system and method capable of varying the output power of an electric vehicle charger.

Interest in developing eco-friendly vehicles is increasing as the most effective alternative to achieving the carbon dioxide reduction target amount for each country in accordance with the strengthening of international regulations on greenhouse gas emissions. The construction of an electric vehicle charging infrastructure is urgently needed in line with the currently completed electric vehicle mass production schedule.

Unlike general internal combustion engine vehicles, electric vehicles are composed of batteries, electric motors, inverters, converters, and BMS (Battery Management System), and rechargeable secondary batteries are used for batteries.

The prerequisite for dissemination of such electric vehicles is to construct a charging infrastructure, and countries around the world are in the process of deriving models for charging infrastructure configuration and service and conducting demonstration projects.

On the other hand, some of the electric vehicle users have a desire to charge the battery of the electric vehicle within a short time with high output from the charger of the electric vehicle.

However, a charger installed in a conventional electric vehicle charging station has a fixed chargeable output power.

For this reason, some of the electric vehicle users have trouble finding a charging station equipped with a charger capable of charging with high power.

The present invention was created to solve the problems of the prior art, and by varying the maximum output power according to the selection of a charger in the existing electric vehicle charging station, charging an electric vehicle that can eliminate the hassle of visiting a charging station capable of charging with high output power. An object thereof is to provide a file output power control system and method.

In order to achieve the above object, the electric vehicle charging pile output power control system according to the present invention includes: a power supply unit; A plurality of charging piles receiving power from the power supply unit and respectively charging a battery of an electric vehicle; An output power input unit for inputting output power for charging the electric vehicle battery; A plurality of changeover switches for converting the power supplied from the power supply to any one of the plurality of charging files; And a central controller configured to vary the output power of the rechargeable charging pile by controlling the plurality of switching switches according to the output power input by the output power input unit.

According to an example related to the present invention, the plurality of filling piles may be provided in a number of 2 ⁿ or a multiple of 4.

According to an example related to the present invention, a plurality of charging module assemblies may further include a plurality of charging module assemblies configured to charge the power supplied from the power supply and transfer the power to the plurality of charging files.

According to an example related to the present invention, each of the plurality of charging module assemblies may include a plurality of charging modules capable of charging the power.

According to an example related to the present invention, a plurality of AC contactors and a plurality of DCs disposed in parallel on each of the upstream and downstream sides of the plurality of charging module assemblies in the flow direction of the current from the power supply to the charging pile Including a contactor, it is possible to open and close the flow of the power.

According to an example related to the present invention, each of the plurality of changeover switches includes: a first contact connected to one of the plurality of DC contactors; A second contact connected to one of the plurality of charging piles; A third contact connected to one of the plurality of DC contactors and a first contact of another switching switch; And one side is connected to the first contact, the other side is selectively connected to one of the second contact and the third contact according to a control signal, and at least two charging module assemblies of the plurality of charging module assemblies, respectively The powers of can be combined or separated from each other.

According to an example related to the present invention, the power supply unit is a three-phase AC power source, the plurality of charging module assemblies are composed of first to fourth charging module assemblies connected in parallel to the power supply unit, and the plurality of DC The contactor is composed of first to fourth DC contactors connected in series in a one-to-one correspondence with the first to fourth charging module assemblies, and the plurality of switching switches selectively select the first and second DC contactors. A first switching switch to connect; A second switching switch selectively connecting the third and fourth DC contactors; And a third changeover switch disposed downstream of the first and second changeover switches in a current flow direction, and selectively connect the first and second changeover switches.

According to an example related to the present invention, the first switching switch converts the power supplied from at least one charging module assembly of the first and second charging module assemblies to the first charging file or the second charging file, , The second switching switch converts power supplied from at least one charging module assembly among the third and fourth charging module assemblies to the third charging file or the fourth charging file, and the third switching switch is the Power supplied from at least one charging module assembly among the first to fourth charging module assemblies may be converted to the second charging file or the fourth charging file.

According to an example related to the present invention, one of the plurality of charging files may be charged with a maximum output power to a power value obtained by summing the power charged in each of the plurality of charging module assemblies.

The electric vehicle charging pile output power control method of the present invention for achieving the above object is, in order to control the maximum output power of the electric vehicle charging pile in which the charging pile is a multiple of 2 ⁿ or 4, power is supplied from the power supply unit Receiving supplied and charging DC power to a plurality of charging module assemblies each configured with a number of 2 ⁿ or a multiple of 4 by the charging module assembly; Controlling a plurality of DC contactors to open and close the charged DC power; And converting the DC power supplied from each of the plurality of DC contactors to any one of the plurality of charging files by controlling a plurality of switching switches.

According to an example related to the present invention, the power supply unit is a three-phase AC power source, the plurality of charging module assemblies are composed of first to fourth charging module assemblies connected in parallel to the power supply unit, and the plurality of DC The contactor is composed of first to fourth DC contactors connected in series in a one-to-one correspondence with the first to fourth charging module assemblies, and the plurality of switching switches selectively select the first and second DC contactors. A first switching switch for connecting and converting the DC power to the first charging file or the second charging file; A second switching switch selectively connecting the third and fourth DC contactors and converting the DC power to the third charging file or the fourth charging file; And disposed on the downstream side of the first and second switching switches in a current flow direction, selectively connecting the first and second switching switches, and connecting the DC power to the second charging file or the fourth charging file. It may include a third changeover switch to switch to.

The effect of the electric vehicle charging pile output power control system and method according to the present invention will be described as follows.

First, the maximum output power of the charger may be varied as the power charged in each of the plurality of charging module assemblies is switched to any one of the plurality of charging files by controlling the plurality of switching switches.

Second, the customer can improve the convenience of the customer by selecting one of the chargers with the maximum output power of 100kW, 200kW, and 400kW to charge the battery of the electric vehicle.

Third, customers can shorten the charging time by using a charger with a high maximum output power to charge.

1 is a circuit diagram illustrating an electric vehicle charger output power system according to the present invention.
FIG. 2 is a block diagram illustrating an electric vehicle charger output power system of FIG. 1.
3 is a flowchart illustrating a method of controlling an electric vehicle charging pile output power according to the present invention when a customer desires to charge 200Kw.
FIG. 4 is a circuit diagram showing an operating state of a changeover switch when charging at 200 kW in a second charging pile during the third step of FIG. 3.
FIG. 5 is a circuit diagram showing an operating state of a changeover switch when charging at 200 kW in a fourth charging pile of the fourth step of FIG. 3.
6 is a flowchart illustrating a method of controlling an electric vehicle charging pile output power according to the present invention when a customer desires to charge 400kW.
FIG. 7 is a circuit diagram showing an operating state of a switching switch when 400kW is charged in a fourth charging pile of the third step of FIG. 6.
8 is a circuit diagram showing an operating state of a changeover switch according to the third embodiment of Table 1 when a customer wants to charge 300kW.
9 is a circuit diagram showing an operating state of a changeover switch according to an eighth embodiment of Table 1 when a customer wants to charge 300kW.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but identical or similar elements are denoted by the same reference numerals regardless of reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used interchangeably in consideration of only the ease of preparation of the specification, and do not have meanings or roles that are distinguished from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, when it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all modifications included in the spirit and scope of the present invention It should be understood to include equivalents or substitutes.

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

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

1 is a circuit diagram illustrating an electric vehicle charger output power system according to the present invention.

The electric vehicle charging pile 150 output power control system according to the present invention includes a power supply unit 10, an AC contactor 110 (CONTACTOR), a charging module assembly 120, a DC contactor 130, and a changeover switch ( 140; TRANSFER SWITCH), charging file (150; CHARGING FILE), and a central controller (160; Central Controller).

The power supply unit 10 is a three-phase AC power grid. The power grid is a power grid made up of power plants, transformers, and transmission lines.

The charging module assembly 120 may be configured in plural. The plurality of charging module assemblies 120 may be separated from each other or may be configured as a single module.

Each of the plurality of charging module assemblies 120 may be connected to the charging pile 150 in a one-to-one correspondence. That is, one charging module assembly 120 is connected to one charging pile 150.

Each of the plurality of charging module assemblies 120 may be composed of a plurality of charging modules.

The plurality of charging module assemblies 120 may be formed of four SETs. 1 The charging module assembly 120 of SET may be composed of four charging modules (CHARGING MODULE).

Each of the plurality of charging modules is configured to serve as an energy storage device that stores AC power as DC power, that is, a rechargeable battery.

For example, the charging module may have a capacity of 30 kW.

One set of charging module assembly 120 may be configured to have a capacity of 10kW.

A plurality of AC contactors 110 may be provided between the three-phase AC grid and the plurality of charging module assemblies 120.

The plurality of AC contactors 110 are connected to a three-phase AC grid in a one-to-one manner, and are connected to the plurality of charging module assemblies 120 to correspond to each other in one-to-one.

The plurality of AC contactors 110 may include a first AC contactor 111 to an Nth AC contactor. N is a natural number of 2 or more. In the present embodiment, the plurality of AC contactors 110 are shown as being configured with the first AC contactors 111 to the fourth AC contactors 114.

The first AC contactor 111 to the fourth AC contactor 114 may be connected in parallel to the three-phase AC grid.

The AC contactor 110 may be installed on a power line connecting the three-phase AC power and the charging module assembly 120. The contactor means a magnetic contactor (MC). A magnetic contactor is a device that can turn on or off electricity in a circuit by electromagnetic force.

The AC contactor 110 is disposed between the three-phase AC power source and the charging module assembly 120 to open and close the circuit. Each of the AC contactors 110 is configured to supply or cut off three-phase AC power to the charging module assembly 120.

The DC contactor 130 may be disposed between the charging module assembly 120 and the switching switch 140. The DC contactor 130 may be configured in plural. The plurality of DC contactors 130 may be connected in parallel.

The plurality of DC contactors 130 are installed on a power line connecting the charging module assembly 120 and the switching switch 140 to open and close a circuit. The plurality of DC contactors 130 may be connected in series to the charging module assembly 120. The DC contactor 130 is connected to the downstream side of the charging module assembly 120 in the current flow direction.

The DC contactor 130 is configured to supply or cut off DC power from the output terminal of the charging module assembly 120 to the charging pile 150.

The plurality of DC contactors 130 may include first to Mth DC contactors. M is a natural number greater than 1. In the present exemplary embodiment, a plurality of DC contactors 130 is shown in which the first to fourth DC contactors 131, 132, 133, and 134 are configured.

Each of the AC contactor 110, the charging module assembly 120, and the DC contactor 130 may be connected to each other in series.

The changeover switch 140 is configured to select which charging pile 150 to transmit DC power supplied from the output terminal of the charging module assembly 120.

The changeover switch 140 is disposed between the DC contactor 130 and the charging pile 150. The changeover switch 140 is configured to connect the DC contactor 130 to any one of the plurality of charging piles 150.

The switching switch 140 is composed of a plurality. The plurality of changeover switches 140 may include a first changeover switch 141 to an Lth changeover switch. Where L is a natural number greater than 1. In this embodiment, a state consisting of the first to third switching switches 141, 142, and 143 is shown.

The filling pile 150 may be composed of a number of 2 ⁿ or a multiple of 4. The changeover switch 140 may be configured by one less than the number of charging piles 150. The number of changeover switches 140 may be (2 ⁿ -1) or (a multiple of 4 -1).

In this embodiment, a case where there are four charging files 150 will be described as an example.

Each of the changeover switches 140 is configured to include a first contact to a third contact. Each of the switching switches 140 is configured to connect the first contact and the second contact or the first contact and the third contact according to the control signal.

Each of the changeover switches 140 is configured to selectively switch from the first contact to any one of the second contact and the third contact. One end of the operation unit 144 of the changeover switch 140 is connected to the first contact, and the other end of the operation unit 144 of the changeover switch 140 is selectively connected to the second contact and the third contact. The other end of the operation unit 144 of the changeover switch 140 may be attached to the second contact point or the third contact point according to the control signal.

The first contact may be connected to the DC contactor 130 or another changeover switch 140.

The second contact may be connected to the charging pile 150.

The third contact may be selectively connected to any one of the DC contactor 130, the other switching switch 140, and the charging pile 150.

In this embodiment, in the case of the first switching switch 141, the first contact is connected to the first DC contactor 131, the second contact is connected to the first charging file 151, and the third contact is 2 It is connected to the first contact point of the DC contactor 132 and the third changeover switch 143.

In the case of the second switching switch 142, the first contact is connected to the third DC contactor 133, the second contact is connected to the third charging file 153, and the third contact is connected to the fourth DC contactor ( It is connected to the third contact point of the 134 and the third switching switch (143).

In the case of the third switching switch 143, the first contact is connected to the third contact of the first switching switch 141, the second contact is connected to the second charging file 152, and the third contact is the second switching It is connected to the third contact point of the switch 142 and the fourth charging pile 154.

According to this configuration, the first switching switch 141 may be configured to selectively connect the first DC contactor 131 and the second DC contactor 132.

For example, the first switching switch 141 receives a control signal and the operation unit 144 of the first switching switch 141 switches from a first contact-second contact connection to a first contact-third contact connection. can do. In this case, the first DC contactor 131 and the second DC contactor 132 are connected.

When each of the first DC contactor 131 and the second DC contactor 132 is turned on, each of the first charging module assembly 121 (100kW charging) and the second charging module assembly 122 (100kW charging) is charged. Since the generated power is supplied to the second charging pile 152, the maximum output power of the second charging pile 152 can be increased to twice (100kW -> 200kW). This is possible under the precondition that the first charging file 151 is not being charged. Each of the first and second charging module assemblies 111 and 122 may be charged at 100kW. Of course, the maximum charging capacity of the charging module assembly 120 may be changed according to design conditions.

If the operation unit 144 of the first switching switch 141 switches from the first contact to the third contact connection to the first contact to the second contact connection according to the control signal, the first DC contactor 131 ) And the second DC contactor 132 are separated. And, when the operation unit 144 of the second switching switch 142 is switched from the first contact-third contact connection to the first contact-second contact connection according to the control signal, the first charging module assembly 120 ) (100kW) of power is supplied to the first charging pile 151, and the power of the second charging module assembly 100kW is supplied to the second charging pile 152.

The second switching switch 142 may be configured to selectively connect the third DC contactor 133 and the fourth DC contactor 134. When the third DC contactor 133 and the fourth DC contactor 134 are connected by the operation of the second changeover switch 142, power is supplied to the third charging module assembly 123 and the fourth charging module assembly ( 124) Since each is supplied to the fourth charging file 154, the maximum output power of the fourth charging file 154 may be doubled.

The third changeover switch 143 may be configured to connect at least one or more of the first to fourth DC contactors 131, 132, 133, and 134.

For example, when the third changeover switch 143 connects all of the first to fourth DC contacts 131, 132, 133, and 134 by the operation of the third switch 143, the power is the first to fourth charging modules Since the assemblies 121, 122, 123, 124 are supplied to the fourth charging pile 154, the maximum output power of the fourth charging pile 154 can be increased to four times (100kW -> 400kW).

The following table shows chargeable power for each charging pile 150 according to the operation of the switching switch 140 when both the AC contactor 110 and the DC contactor 130 are in the ON state.

In the case of the first embodiment in Table 1, the contact 1-2 of the first changeover switch 141 is connected, the contact 1-2 of the second changeover switch 142 is connected, and the third changeover switch 143 When the 1-2 contacts of) are connected, all of the first to fourth charging piles 150 can be charged by 100 kW.

In the case of the second embodiment, the contact 1-2 of the first changeover switch 141 is connected, the contact 1-3 of the second changeover switch 142 is connected, the first of the third changeover switch 143 -When the 2nd contact is connected, the first and second charging files 151 and 152 can be charged by 100kW, the third charging file 153 cannot be charged, and the fourth charging file 154 can be charged 200kW. .

In the case of the third embodiment, the contact 1-2 of the first changeover switch 141 is connected, the contact 1-3 of the second changeover switch 142 is connected, and the first of the third changeover switch 143 When the -3 contacts are connected, the first charging file 151 can be charged 100kW, the second and third charging files 153 cannot be charged, and the fourth charging file 154 may be charged 300kW.

In the case of the fourth embodiment, the contact 1-2 of the first changeover switch 141 is connected, the contact 1-2 of the second changeover switch 142 is connected, and the first of the third changeover switch 143 When the -3 contacts are connected, the first and third charging files 151 and 153 can be charged 100kW, the second charging file 152 cannot be charged, and the fourth charging file 154 can be charged 200kW.

In the case of the fifth embodiment, the first-3 contacts of the first changeover switch 141 are connected, the first-2 contacts of the second changeover switch 142 are connected, and the first of the third changeover switch 143 When the -2 contacts are connected, the first charging file 151 cannot be charged, the second charging file 152 may be charged 200kW, and the third and fourth charging files 153 and 154 may be charged 100kW.

In the case of the sixth embodiment, the 1-3 contacts of the first switching switch 141 are connected, the 1-3 contacts of the second switching switch 142 are connected, and the first of the third switching switch 143 When the -2 contacts are connected, the first and third charging files 151 and 153 cannot be charged, the second charging file 152 can be charged 200kW, and the fourth charging file 154 can be charged 200kW.

In the seventh embodiment, the 1-3 contacts of the first changeover switch 141 are connected, the 1-3 contacts of the second changeover switch 142 are connected, and the first of the third changeover switch 143 When the -3 contacts are connected, the first to third charging files 151, 152, and 153 cannot be charged, and the fourth charging file 154 may be charged 400kW.

In the case of the eighth embodiment, the first-3 contacts of the first changeover switch 141 are connected, the first-2 contacts of the second changeover switch 142 are connected, and the first of the third changeover switch 143 When the -3 contacts are connected, the first and second charging files 151 and 152 cannot be charged, the third charging file 153 can be charged 100kW, and the fourth charging file 154 can be charged 300kW.

FIG. 2 is a block diagram illustrating an electric vehicle charger output power system of FIG. 1.

The electric vehicle charger output power system includes an output power input unit 157, a central controller 160, an AC contactor 110, a DC contactor 130, a charging module assembly 120, a DC contactor 130, and a switching switch ( 140), it is configured to include a charging pile (150).

The output power input unit 157 is configured to input charging power desired by the user.

The output power input unit 157 may be installed at the entrance of the charging station. The output power input unit 157 may be installed on the display panel to enable input by a touch type or a push type.

The output power input unit 157 is configured to be easily operated by a user.

The central controller 160 includes a contactor control unit 161, a charging module control unit 162 and a changeover switch control unit 163.

The contactor control unit 161 may be connected to the AC contactor 110 and the DC contactor 130 to control ON/OFF of the AC contactor 110 and the DC contactor 130.

The charging module control unit 162 is configured to control the charging module. The charging module control unit 162 includes a rectifier and a DC-DC converter. The rectifier is configured to convert 3-phase AC power to DC and deliver it to the charging module. The DC-DC converter is a power converter that converts DC power input from a rectifier into DC power required by an electric vehicle battery, and may include a semiconductor switch, a capacitor, an inductor, and a transformer.

The changeover switch control unit 163 is configured to control a plurality of changeover switches 140.

The charging pile 150 includes a display panel, a charging gun 155, a charging cable, and a charging gun connector.

The display panel is configured to enable communication between the user and the charging file 150. The user can input the desired output power value through the display panel.

The central controller 160 is connected to the display panel to enable bidirectional communication. The display panel is configured to inform the user of various information such as charging information of the charging file 150.

A charging gun connector may be installed in the charging gun 155. The charging gun connector is configured to be connected to the charging socket of the electric vehicle to charge the battery of the electric vehicle. The charging cable is made to connect the charging gun 155 and the charging pile 150.

The charging gun connector may have different types of connectors depending on the charging method, that is, rapid charging or slow charging.

3 is a flowchart illustrating a method of controlling output power of the electric vehicle charging pile 150 according to the present invention when a customer desires to charge 200Kw. FIG. 4 is a circuit diagram showing an operating state of the changeover switch 140 when charging at 200 kW in the second charging pile 152 during the third step of FIG. 3. 5 is a circuit diagram showing an operating state of the switching switch 140 in the case of charging at 200 kW in the fourth charging pile 154 during the fourth step of FIG. 3.

As a first step, the second charging file 152 or the fourth charging file 154 may be in standby (S110).

In the second step, when the customer desires to charge 200kW, it can be selected by touching a several 200kW charging button through the output power input unit 157 (S120).

In a third step, when charging is desired in the second charging file 152, it is determined whether the first charging file 151 is being charged (S130).

When the first charging file 151 is not being charged, a message indicating that charging is possible in the second charging file 152 may be displayed (S131).

The second charging file 152 is ready for charging, and the contactor control unit 161 turns off the first and second AC contactors 111 and 112 (OPEN), and the first and second DC contactors 132 ) To OFF (OPEN) (S132).

The first contact point 1-3 of the first switching switch 141 is connected, and the contact point 1-2 of the third switching switch 143 is connected (see FIG. 4) (S133).

The contactor control unit 161 turns on the first and second AC contactors 111 and 112 (CLOSE), and turns on the first and second DC contactors 132 (CLOSE). The charging module control unit controls the current/voltage of each of the first and second charging module assemblies 121 and 122 (S134).

According to this, the first switching switch 141 connects the first and second DC contactors 132 by switching from the 1-2 contact point to the 1-3 contact point, and the first and second charging module assemblies ( The power supplied from each of 111 and 122 is transferred to the second charging pile 152.

The second charging pile 152 may be charged with a maximum output power of 200 kW obtained by summing the powers of each of the first and second charging module assemblies 111 and 122.

It is determined whether charging is completed in the second charging file 152 (S135).

The second charging file 152 is charged until charging is completed. When charging is completed, current and voltage control of the first and second charging module assemblies 111 and 122 are stopped, the first and second AC contactors 111 and 112 are closed, and the first and second DC contactors 132 It ends after closing (S136).

If the first charging file 151 is being charged in the third step (S130), 200kW charging in the second charging file 152 is impossible. In addition to the second charging file 152, the user is asked whether to charge the fourth charging file 154 that can be charged at 200 kW.

In a fourth step (S140), it is determined whether or not the third charging file 153 is being charged when 200kW charging is desired in the fourth charging file 154.

If the third charging file 153 is not being charged, a message indicating that charging is possible in the fourth charging file 154 is displayed to the user on the display panel (S141).

Then, the fourth charging file 154 prepares for charging. The third and fourth AC contactors 113 and 114 and the third and fourth DC contactors 133 and 134 are turned off (S142).

Subsequently, the contact 1-3 of the second changeover switch 142 is connected, and the contact 1-2 of the third changeover switch 143 is connected (see FIG. 5) (S143).

The contactor control unit 161 turns on the third and fourth AC contactors 113 and 114 (CLOSE), and turns on the third and fourth DC contactors 133 and 134 (CLOSE). The charging module control unit controls current/voltage of each of the third and fourth charging module assemblies (S144).

According to this, the second switching switch 142 switches from the 1-2 contact point to the 1-3 contact point, thereby connecting the third and fourth DC contactors 133 and 134, and the third and fourth charging module assemblies ( 123 and 124), the power supplied from each is transferred to the fourth charging pile 154.

The fourth charging pile 154 may be charged with a maximum output power of 200kW obtained by summing the power of each of the third and fourth charging module assemblies 123 and 124.

It is determined whether or not charging is completed in the fourth charging file 154 (S145).

The fourth charging file 154 is charged until the charging is completed. When charging is complete, the current and voltage control of the third and fourth charging module assemblies 123 and 124 are stopped, the third and fourth AC contactors 113 and 114 are closed, and the third and fourth DC contactors 133 and 134 It ends after closing (S146).

In the fifth step, if the third charging file 153 is being charged in the fourth step (S140), 200kW charging is not possible in the fourth charging file 154 as well. For this reason, since there is currently no charging file 150 that can be charged to 200kW through the display panel, it is necessary to wait until the first charging file 151 or the third charging file 153 is completely charged, and the waiting time for the user It informs (S150).

6 is a flowchart illustrating a method of controlling output power of an electric vehicle charging pile 150 according to the present invention when a customer desires to charge 400kW. 7 is a circuit diagram showing an operating state of the changeover switch 140 when 400kW is charged in the fourth charging pile 154 during the third step of FIG. 6.

As a first step, the fourth charging file 154 may be in standby (S210).

In the second step, when the customer desires to charge 400kW, it may be selected by touching a 400kW charging button through the output power input unit 157 (S220).

In a third step, when charging is desired in the fourth charging file 154, it is determined whether one of the first to third charging files 151, 152, and 153 is charging (S230).

If all of the first to third charging files 151, 152, and 153 are not being charged, a message indicating that charging is possible in the fourth charging file 154 may be displayed through the display panel (S231).

The fourth charging file 154 is ready to be charged, and the contactor control unit 161 turns off the first to fourth AC contacts 111, 112, 113, and 114 (OPEN), and the first to fourth DC contacts 131,132,133,134 ) To OFF (OPEN) (S232).

Connect the 1-3 contacts of the first conversion switch 141, connect the 1-3 contacts of the second conversion switch 142, and connect the 1-3 contacts of the third conversion switch 143 (See Fig. 7) (S233).

The contactor control unit 161 turns on the first to fourth AC contactors 111, 112, 113, and 114 (CLOSE), and turns on the first to fourth DC contactors 131, 132, 133, and 134 (CLOSE). The charging module control unit controls current/voltage of each of the first to fourth charging module assemblies (S234).

According to this, each of the first to third switching switches 141, 142, and 143 switches from the first to the second contact to the first to the third contact, thereby connecting the first to fourth DC contacts 131, 132, 133, and 134, and the first to fourth contacts. The power supplied from each of the charging module assemblies 121, 122, 123, 124 is transferred to the fourth charging pile 154.

The fourth charging pile 154 may be charged with a maximum output power of 400kW obtained by summing the powers of each of the first to fourth charging module assemblies 121, 122, 123, and 124.

It is determined whether charging is completed in the fourth charging file 154 (S235).

The fourth charging file 154 is charged until the charging is completed. When charging is complete, the current and voltage control of the first to fourth charging module assemblies 121, 122, 123, 124 is stopped, the first to fourth AC contacts 111, 112, 113, 114 are closed, and the first to fourth DC contactors 131, 132, 133, 134 It ends after closing (S236).

In the third step, if any one of the first to third charging files 151, 152, and 153 is being charged, 400kW cannot be charged in the fourth charging file 154 (S140). If 400kW is desired to be charged, it is necessary to wait until charging of the other first to third charging files 151, 152, and 153 is completed, and the waiting time is notified to the user through the display panel (S240).

8 is a circuit diagram showing an operating state of the switching switch 140 according to the third embodiment of Table 1 when a customer wants to charge 300kW. 9 is a circuit diagram showing an operating state of the changeover switch 140 according to the eighth embodiment of Table 1 when a customer wants to charge 300kW.

Referring to FIG. 8, the first switching switch 141 connects the contact 1-2, and the second and third switching switch 143 connect the contact 1-3, and the 2nd to 4th DC contact The modules 132, 133, and 134 are connected, and power is supplied from each of the second to fourth charging module assemblies 124 to the fourth charging pile 154, so that the fourth charging pile 154 can be charged at a maximum of 300Kw.

Referring to FIG. 9, each of the first and third switching switches 143 connects the first to third contacts, and the second switch 142 connects the first to second contacts, The fourth DC contactors 131, 132, 134 are connected, and power is supplied from each of the first, second and fourth charging module assemblies 124 to the fourth charging file 154, so that the fourth charging file 154 is It can be charged at 300Kw.

Accordingly, according to the present invention, the power charged in each of the plurality of charging module assemblies 120 is switched to any one of the plurality of charging files 150 by controlling the plurality of switching switches 140. Accordingly, the maximum output power of the charger can be varied.

In addition, customers can improve the convenience of customers by selecting one of chargers with maximum output power of 100kW, 200kW, and 400kW to charge the battery of the electric vehicle.

In addition, the customer can shorten the charging time by charging using a charger with a high maximum output power.

10: power supply unit 110: AC contactor
111: first AC contactor 112: second AC contactor
113: 3rd AC contactor 114: 4th AC contactor
120: charging module assembly 121: first charging module assembly
122: second charging module assembly 123: third charging module assembly
124: fourth charging module assembly 130: DC contactor
131: first DC contactor 132: second DC contactor
133: 3rd DC contactor 134: 4th DC contactor
140: changeover switch 141: first changeover switch
142: second switching switch 143: third switching switch
144: operation unit 150: charging pile
151: first charging file 152: second charging file
153: 3rd charging file 154: 4th charging file
155: charging gun 157: output power input
160: central controller 161: contactor control unit
162: charging module control unit 163: changeover switch control unit

Claims (11)

Power supply;
A plurality of charging piles receiving power from the power supply unit and respectively charging a battery of an electric vehicle;
An output power input unit for inputting output power for charging the battery of the electric vehicle;
A plurality of changeover switches for converting the power supplied from the power supply to any one of the plurality of charging files; And
An electric vehicle charging file output power control system comprising a central controller configured to control the plurality of switching switches according to the output power input by the output power input unit to vary the output power of the chargeable charging file. The method of claim 1,
The electric vehicle charging file output power control system provided with the plurality of charging piles in a number of 2 ⁿ or a multiple of 4. The method of claim 1,
Electric vehicle charging pile output power control system further comprising a plurality of charging module assembly for charging the power supplied from the power supply and transmitting the power to the plurality of charging piles. The method of claim 3,
Each of the plurality of charging module assemblies includes a plurality of charging modules capable of charging the electric power. The method of claim 3,
Including a plurality of AC contactors and a plurality of DC contactors arranged in parallel on each of the upstream side and the downstream side of the plurality of charging module assembly in the flow direction of the current from the power supply to the charging pile Electric vehicle charging pile output power control system that opens and closes the flow. The method of claim 5,
Each of the plurality of changeover switches,
A first contact connected to one of the plurality of DC contactors;
A second contact connected to one of the plurality of charging piles;
A third contact connected to one of the plurality of DC contactors and a first contact of another switching switch; And
One side is connected to the first contact, the other side is selectively connected to one of the second contact and the third contact according to a control signal, and each of at least two charging module assemblies of the plurality of charging module assemblies Electric vehicle charging pile output power control system that combines or separates power from each other. The method of claim 5,
The power supply is a three-phase AC power,
The plurality of charging module assemblies are composed of first to fourth charging module assemblies connected in parallel to the power supply unit,
The plurality of DC contactors are composed of first to fourth DC contactors connected in series in a one-to-one correspondence with the first to fourth charging module assemblies,
The plurality of changeover switches,
A first switching switch selectively connecting the first and second DC contacts;
A second switching switch selectively connecting the third and fourth DC contactors; And
An electric vehicle charging pile output power control system comprising a third switching switch disposed on a downstream side of the first and second switching switches in a current flow direction and selectively connecting the first and second switching switches. The method of claim 7,
The plurality of charging files are composed of a first charging file to a fourth charging file,
The first switching switch converts power supplied from at least one charging module assembly among the first and second charging module assemblies to the first charging file or the second charging file,
The second conversion switch converts power supplied from at least one charging module assembly among the third and fourth charging module assemblies to the third charging file or the fourth charging file,
The third conversion switch is an electric vehicle charging file output power control system for converting the power supplied from at least one charging module assembly of the first to fourth charging module assembly to the second charging file or the fourth charging file. The method of claim 3,
An electric vehicle charging file output power control system capable of charging one of the plurality of charging files to a power value obtained by summing the power charged in each of the plurality of charging module assemblies with maximum output power. In a method for controlling the maximum output power of an electric vehicle charging pile in which the charging pile is composed of a number of 2 ⁿ or a multiple of 4,
Receiving power from a power supply and charging DC power to each of a plurality of charging module assemblies configured with a number of 2 ⁿ or a multiple of 4 by the charging module assembly;
Controlling a plurality of DC contactors to open and close the charged DC power;
And converting the DC power supplied from each of the plurality of DC contactors to any one of the plurality of charging files by controlling a plurality of switching switches. The method of claim 10,
The power supply is a three-phase AC power,
The plurality of charging module assemblies are composed of first to fourth charging module assemblies connected in parallel to the power supply unit,
The plurality of DC contactors are composed of first to fourth DC contactors connected in series in a one-to-one correspondence with the first to fourth charging module assemblies,
The plurality of charging files are composed of a first charging file to a fourth charging file,
The plurality of changeover switches,
A first switching switch selectively connecting the first and second DC contactors and converting the DC power to the first charging file or the second charging file;
A second switching switch selectively connecting the third and fourth DC contactors and converting the DC power to the third charging file or the fourth charging file; And
It is disposed on the downstream side of the first and second switching switches in a current flow direction, selectively connecting the first and second switching switches, and transferring the DC power to the second charging file or the fourth charging file. Electric vehicle charging pile output power control system including a third switching switch for switching.

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