KR20220003894A - Smart charging system and smart charging method including smart concentric plug, user terminal, and power management server - Google Patents

Abstract

The present invention relates to a smart outlet for supplying power to a user terminal, which comprises: a wireless connection unit which receives an authentication code from the user terminal; an authentication code determining unit which performs authentication by decoding the received authentication code; and a control unit which calculates, when the authentication of the received authentication code is valid, allowable power for the user terminal according to the maximum outlet power that the smart outlet can supply, and transmits the allowable power to the user terminal through the wireless connection unit.

Description

Smart charging system and smart charging method including a smart outlet, a user terminal, and a power management server {Smart charging system and smart charging method including smart concentric plug, user terminal, and power management server}

The present disclosure relates to a smart charging system and a smart charging method including a smart outlet, a user terminal, and a power management server.

When an electric vehicle is connected to an outlet for charging, a user terminal such as a portable charger or an emergency charger that is a charging means sets the charging power low in consideration of the power capacity limit of the outlet. If the user terminal uses a high charging power, the outlet may be damaged due to overheating, and if the outlet is located in a wooden house, it may cause a fire.

In general, the user terminal is equipped with a function of adjusting the charging power in several stages, but the user may not set it appropriately to the power capacity of the outlet. In addition, even for a user with ordinary knowledge, there is a problem in that it is difficult to determine the power that can be supplied to an outlet to which the user terminal is to be connected.

In addition, in a place such as an apartment parking lot where a plurality of outlets are installed, when a plurality of users use a user terminal, the charging power may exceed the power that can be supplied from the outlets, and the power supply system connected to the outlets Problems such as tripping of the wiring breakers may occur. Then, not only the outlets of the apartment parking lot, but also the electricity supply in other places connected to the power supply system may be disturbed.

In the prior art, in order for a user terminal to be connected to a smart outlet and receive power, the user terminal must be approved by a communication means to a user power management server or management center. However, if a failure occurs in the communication state, power management server, management center, etc., there may be a problem in that approval cannot be obtained. In addition, even when the user wants to use the smart outlet for personal use instead of charging the electric vehicle, there is a hassle of having to connect to the power management server and the management center for approval using communication means, and the user may feel this inconvenient. .

An object of the present invention is to provide a smart charging system and a smart charging method, including a smart outlet, a user terminal, and a power management server, which have enhanced security compared to the prior art, maximize user convenience, and stably supply power.

A smart outlet for supplying power to a user terminal according to an aspect of the invention includes: a wireless connection unit for receiving an authentication code from the user terminal; an authentication code determining unit for performing authentication by decoding the received authentication code; And when the authentication of the received authentication code is valid, the control unit for calculating the allowable power for the user terminal according to the maximum outlet power that the smart outlet can supply, and transmitting the allowable power to the user terminal through the wireless connection unit may include

The smart outlet may include: a power calculator configured to detect the voltage and current of the power supply system and periodically calculate the power supplied from the power supply system; a power suitability determination unit that receives information on the current and voltage detected by the power calculator, detects a degree of change in voltage versus current, and determines whether power is suitable by comparing whether the amount of change in voltage versus current is within an allowable value; a wireless connection unit for transmitting allowable power information by connecting to the user terminal through wireless communication; a communication connection unit for receiving allowable power management information from a power management server through the wired/wireless network; an authentication code determining unit for performing authentication by decoding the authentication code; and a control unit configured to generate the allowable power information that can be supplied based on the allowable power management information.

The smart outlet may include: a timer for generating information on the current time and updating the current time with the time information transmitted from the power management server; And at least the power information used by the user terminal, the authentication code information, and further comprising a memory unit for storing time information when the user terminal uses the smart outlet, the control unit, the at least the power information, the time information, and processing the authentication code information so that the communication connection unit can transmit it to the power management server through the wired/wireless network.

The control unit may store the at least the power information, the time information, and the authentication code information in the memory unit when communication with the power management server is not possible, and transmit it to the power management server when communication is possible .

The control unit may transmit at least one of identification unique information of the smart outlet and network information to which the smart outlet is connected, and a result of validity determination for the received authentication code to the power management server through the wireless connection unit. .

The control unit may determine whether the used power calculated by the power calculator is within the allowable power, and block the power output when the calculated used power exceeds the allowable power for a predetermined threshold period.

The smart outlet may further include an authentication key storage unit for storing the authentication key of the smart outlet, wherein the authentication key is an asymmetric key and includes a private key and a private key paired with the private key and another public key. can

The smart outlet, when authentication for the user terminal fails, controls the user terminal to use only a predetermined basic power, and the accumulated amount of power supplied from the smart outlet exceeds the basic amount of power, or the usage time exceeds the basic time When it exceeds, the cut-off state can be maintained for a certain period of time after the power supply is cut off.

In a user terminal for charging an electric vehicle by receiving power from a smart outlet according to another aspect of the present invention, the user terminal comprising: a power calculator for periodically detecting the voltage and current of power supplied from the smart outlet, and calculating the supplied power; a wireless connection unit for receiving allowable power information by connecting to the smart outlet through wireless communication; a charging signal processing unit generating a signal indicating that charging power according to the allowable power information can be supplied to the electric vehicle; and a charging control processing unit that receives information on the detected current and voltage, detects a degree of change in voltage versus current, compares whether the amount of change in voltage versus current is within an allowable value, and determines whether power is suitable.

The user terminal, the authentication code storage unit for storing the unique authentication code recorded during the production of the user terminal; and an authentication key storage unit storing the authentication key of the user terminal, wherein the authentication key is an asymmetric key, and may include a private key and a private key paired with the private key and another public key.

The user terminal may encrypt the authentication code with the public key, and transmit the encrypted authentication code together with the public key to the smart outlet.

The power management server for controlling at least one smart outlet connected to the power supply system according to another aspect of the present invention includes identification information of the smart outlet from the at least one smart outlet through a wired/wireless network, network information to which the smart outlet is connected, a power information receiving unit for receiving at least one of usage time information of the user terminal and power usage information of the user terminal; a database for classifying and storing information received by the power information receiver; and subtracting the used power of the at least one smart outlet from the maximum allowable power of the power supply system to calculate the grid surplus power of the power supply system, and based on the grid surplus power, the maximum for the at least one smart outlet It may include a power control unit for calculating the outlet power.

The power management server may further include an allowable power transmitter configured to transmit allowable power management information indicating the maximum outlet power to the at least one smart outlet through a wired/wireless network.

When the at least one smart outlet includes a plurality of smart outlets, and the power control unit is, the grid spare power is insufficient than the sum of the unique supplyable power of the smart outlets on standby among the plurality of smart outlets, the grid spare power And in consideration of the unique supply power of each smart outlet, it is possible to determine and update the allowable power management information of each smart outlet.

The power control unit periodically uses the identification information information of the at least one smart outlet and the network information to which the at least one smart outlet is connected, location information recorded when the at least one smart outlet is installed, connected power It is possible to obtain supply system information and maximum allowable power information of the corresponding power supply system, and update information on the power being used by the at least one smart outlet.

The power control unit, when the at least one smart outlet includes a plurality of smart outlets, by using the communication network information to which the plurality of smart outlets are connected and identification information of the plurality of smart outlets, to the same power supply system A plurality of installed smart outlets can be set as one group.

The power control unit, on the basis of the power use time information and power information for each of the plurality of smart outlets, while monitoring the change in the voltage waveform according to the power use time information, the voltage waveform fluctuates at the same time as one smart outlet It can be set as a group.

Smart charging method according to another feature of the invention, when the user terminal is connected to the smart outlet, the smart outlet performing authentication based on the authentication code received from the user terminal; determining, by the smart outlet, whether authentication is valid; transmitting, by the smart outlet, allowable power to the user terminal when the authentication is valid; when the authentication is not valid, the smart outlet setting the supply power to the minimum power; calculating the amount of electric power supplied by the smart outlet from the smart outlet and used by the user terminal; determining, by the smart outlet, whether power supplied to and used by the user terminal exceeds a basic power when the authentication is not valid; and when the authentication is invalid, when the power used by the user terminal exceeds the basic power, the smart outlet cuts off the power, and waits for a predetermined time to elapse.

The smart charging method includes: calculating the power used by the smart outlet by the user terminal; periodically transmitting the socket identification information of the smart outlet, network information, and the calculated power to a power management server; Determining whether the amount of power consumed by the regular smart outlet supplied from the smart outlet is greater than or equal to a predetermined reference value; and if the power consumption is greater than or equal to the reference value, determining that the user terminal is connected to the smart outlet, and connecting the smart outlet and the user terminal through communication.

In the smart charging method, when the authentication is not valid and the power used by the user terminal does not exceed the basic power, the smart outlet causes the accumulated power used by the user terminal to exceed the basic power or determining whether the usage time of the user terminal has passed a predetermined basic time; and when the accumulated amount of power exceeds the basic amount of power or the usage time elapses the basic time, the smart outlet cuts off power and waits for a predetermined time to elapse.

The smart charging method may include, when the authentication is valid, the smart outlet determines whether a power supply period has elapsed a predetermined threshold time while the power supplied to the user terminal is less than or equal to a predetermined threshold power; and when the period in which the supply power is equal to or less than the threshold power elapses the threshold time, the smart outlet determines that power use by the user terminal has ended, releases authentication, and sends the authentication release to the power management server It may further include the step of transmitting.

The smart charging method includes: determining whether communication between the smart outlet and the power management server is possible; transmitting, by the smart outlet, information on power used by the user terminal, the outlet identification information, the network information, and the user terminal unique number information, to the power management server if the determination result is communicable; and if the determination result is not available for communication, the smart outlet may further include the step of storing the used power information and the authentication code information.

The smart charging method includes: determining whether communication between the smart outlet and the power management server is possible; If the determination result is not available for communication, the smart outlet storing the power use information and the authentication code information; and if the determination result is maintained in a non-communicable state, transmitting the used power information and the authentication code information stored by the smart outlet to the power management server through a registered user portable terminal. have.

The smart charging method includes: transmitting, by the smart outlet, power information used by the user terminal, the outlet identification information, the network information, and the user terminal unique number information to the power management server; determining whether the smart outlet terminates communication with the user terminal; and when the communication is terminated, the smart outlet releases authentication and transmits the authentication release to the power management server.

The smart charging method may further include, when the user terminal receives the allowable power from the smart outlet, the user terminal generating a charging signal to the electric vehicle to be charged within the allowable power.

According to another aspect of the present invention, a smart charging method using a smart outlet and a power management server connected through a wired/wireless network includes the steps of: receiving, by the power management server, a request for authentication information for use from a user's smart phone; transmitting, by the power management server, authentication code information for authentication to the smart phone; receiving, by a smart outlet, the authentication code information from the smart phone; and when the smart outlet approves the authentication code information, transmitting allowed power information to the smart phone.

The smart charging method includes: receiving, by the smart outlet, the authentication code from the power management server; and the smart outlet comparing the authentication code received from the user smart phone with the authentication code received from the power management server and authenticating it.

According to another aspect of the present invention, an authentication method between a user terminal and a smart outlet includes: decrypting, by the smart outlet, an authentication code received from the user terminal using a public key received from the user terminal; calculating, by the smart outlet, a hash value by extracting a unique number from the decrypted authentication code and combining the secret code stored in the unique number; Comparing, by the smart outlet, the calculated hash value and the hash value included in the authentication code; encrypting, by the smart outlet, the request code stored in the smart outlet with the received public key when the hash value comparison result is the same, and transmitting the encrypted request code to the user terminal; and receiving, by the smart outlet, a hash value for the request code from the user terminal, and comparing the received hash value with a hash value for the stored request code.

According to another aspect of the present invention, there is provided an authentication method between a user terminal and a smart outlet, the method comprising: transmitting, by the user terminal, an authentication code and a public key to the smart outlet; receiving, by the user terminal, a request code encrypted with the public key from the smart outlet; decrypting, by the user terminal, the encrypted request code with a private key; and generating a hash value for the decrypted request code and transmitting it to the smart outlet.

The authentication code includes a unique number of the user terminal and a hash value for a value in which the unique number and the secret code are combined, and may be encrypted by the private key.

The present invention provides a smart charging system and a smart charging method, including a smart outlet, a user terminal, and a power management server, which have enhanced security compared to the prior art, maximize user convenience, and stably supply power.

1 is a view showing a smart charging system according to an embodiment.
2 is a diagram illustrating a connection between a smart outlet and a user terminal according to an embodiment.
3 is a block diagram illustrating a smart outlet according to an embodiment.
4 is a diagram illustrating a user terminal according to an embodiment.
5 is a flowchart illustrating a method of operating a smart charging system.
6 is a diagram illustrating a power management server according to an embodiment.
7 is a diagram illustrating a database according to an embodiment.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but identical or similar components are given the same and similar reference numerals, and overlapping descriptions thereof will be omitted. The suffixes "module" and/or "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When an element is referred to as being “connected” or “connected” to another element, it is understood that it may be directly connected or connected to the other element, but other elements may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

In the present application, terms such as “comprises” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

1 is a view showing a smart charging system according to an embodiment.

The smart charging system 1 includes a plurality of smart outlets 11 - 14 connected to a plurality of power supply systems, a power management server 20 , and a user terminal 30 . A user terminal means a charging device used by a user for charging.

In the smart charging system 1, the management server 20 and the plurality of smart outlets 11-14 can transmit and receive information through the wired/wireless network 100, and the user terminal 30 and the plurality of smart outlets 11 -14), information can be transmitted and received through direct short-distance communication with the connected smart outlet. Although one user terminal 30 is illustrated in FIG. 1 , the smart charging system 1 may include a plurality of user terminals.

The wired/wireless network 100 is an IP address-based wired/wireless network, and each of the smart outlets 11-14 searches for an access point (AP) that can be accessed either wired or wirelessly. You can connect to an AP with good sensitivity. Each of the smart outlets 11-14 may transmit network information including information of an AP to which it is connected to the power management server 20 .

The smart charging system 1 further includes a user smart phone 40 and a payment system 50 , and the user smart phone 40 and the management server 20 receive information through the WWW (World Wide Web) 200 . can transmit and receive. The payment system 50 may receive information on the amount of energy used by the user from the power management server 20 , and may perform billing and settlement based on the information on the amount of electricity used by the user. The user power consumption information may include information about the user, the user's power usage amount, power usage time, and the like. The payment system 50 may transmit the billing and payment progress results to the power management server 20 .

Although two power supply systems and four smart outlets connected to the power supply system are illustrated in FIG. 1, the invention is not limited thereto as an example for explaining the invention. In addition, the user smart phone 40 and the management server 20, as well as the WWW 200, an application installed in the user smart phone 40 can transmit and receive information to and from the management server 20 through a wired/wireless network.

The authentication procedure between the user terminal 30 and the smart outlet 11-14 may be directly performed through data transmission/reception using short-distance communication. The short-distance communication may be one of Near Field Communication (NFC), Bluetooth, Wireless Fidelity, and the like.

As shown in FIG. 1 , the smart outlets 11 and 12 are connected to the power supply system 1 300 , and the smart outlets 13 and 14 are connected to the power supply system 2 400 . Power is supplied from the power supply systems 1 and 2 (300, 400) to the smart outlet (11-14). At least one user terminal is electrically connected to each of the smart outlets 11-14, and power supplied from the power supply system 1 (300) or the power supply system 2 (400) may be supplied to the user terminal. In FIG. 1 , for convenience of explanation, it will be described that the user terminal 30 is connected to the smart outlet 11 . Hereinafter, a connection between the smart outlet and the user terminal means an electrical connection through which power can be supplied from the smart outlet to the user terminal. In addition, the connection between the user terminal and the smart outlet means that information can be transmitted and received through wireless communication.

The smart outlet 11-14 and the power management server 20 may transmit and receive power usage information, outlet identification information, network information, and allowable power management information through the wired/wireless network 100 .

The power usage information includes an authentication code received from the user terminal connected to the smart outlet, the usage time at which the user terminal is supplied with power through the smart outlet, and power usage information related to the amount of power supplied by the user terminal. The outlet identification information includes an identification code such as a serial number of the corresponding smart outlet, outlet status information, and the like. The outlet status information includes the power supplied from the smart outlet, the voltage and current of the power outlet, the temperature of the smart outlet, the current time, the accumulated usage of the user terminal from the smart outlet, the usage time of the user terminal, and other actions performed by the smart outlet. It may include information indicating The network information includes network information to which the smart outlet is connected, address information, and the like. The allowable power management information includes information on the maximum power that can be provided by the corresponding smart outlet.

The power management server 20 calculates the maximum power information that can be supplied by subtracting the power currently used in each power supply system from the maximum allowable power that can be supplied through each power supply system managed by the power management server 20 . can do. That is, the maximum power information may be calculated for each smart outlet connected to the power supply system. The power management server 20 transmits the maximum power information to the smart outlet, and the smart outlet may transmit the available power value to the user terminal within the range of the maximum power information of the smart outlet. The user terminal transmits a charging signal to the electric vehicle to be charged according to a normal charging method according to available power. In the prior art, when an electric vehicle is charged with a user terminal, the user sets the charging current to manually set the charging power. It could cause problems such as operation, heat or burnout of the outlet. The present invention prevents such a user's mistake, and has the advantage that convenience and efficiency can be increased by automatically setting the power available to the user terminal, and in the prior art, the user can prevent heat or burnout of the above-described outlet. It is possible to solve the problem of not being able to charge effectively by charging by setting it to a low current for fear.

The smart outlet may lower the calculated allowable power when there is a problem in the power supply system at the time of supplying power to the user terminal. For example, if the voltage drop between lines is large or the voltage is unstable due to problems such as aging of the power supply system, or if heat is generated due to contact resistance due to aging of the contact part, the smart outlet will use lower power than the calculated allowable power. It can be determined by the allowable power.

The power management server 20 according to an embodiment is a general server in which a server program for transmitting and receiving information is performed by being connected to several computer devices through a network, or is installed in each of an apartment complex, a building, a detached house complex, etc. It may be a device in which a control program for managing power supply is performed. As such, the power management server 20 is connected to the power supply system and collectively refers to a device on which a program for controlling a plurality of smart outlets supplying power is executed, and the invention is not limited by the term.

The smart outlet 11 and the user terminal 30 are directly connected through short-range wireless communication, and the user terminal 30 first transmits the encrypted authentication code and public key to the smart outlet 11, and the smart outlet 11 ) decrypts the encrypted authentication code using the received public key, and performs authentication based on the decrypted authentication code.

The authentication code is information on the unique number of the user terminal, is generated according to a predetermined rule, and is given to the user terminal when the user terminal is manufactured. The authentication code may include a unique number of the user terminal (eg, a series of code information created in a manufacturing step including a serial number) and a hash value corresponding to the unique number. At the time of manufacturing the user terminal, the manufacturer may calculate a hash value corresponding to the unique number, and store it in the user terminal. The hash value corresponding to the unique number is a hash value for the combined value of the unique number and the secret code of the user terminal. The secret code is not stored in the user terminal, only the hash value for the combination of the unique number and the secret code are saving The secret code is a value for authentication stored in the smart outlet. The user terminal may store the hash value encrypted with the private key, and the authentication code may be composed of a combination of a unique number encrypted with the private key and the hash value encrypted with the private key.

The user terminal may transmit the shared key paired with the private key to the smart outlet to decrypt the authentication code.

The smart outlet 11 may determine the allowable power based on the maximum power information received from the power management server 20 , and transmit the allowable power information to the user terminal 30 . Allowable power information includes power information that can be supplied to the user terminal from the corresponding smart outlet.

If the user's charging device is a third device that cannot directly connect to the smart outlet 11-14, the user uses the user's smart phone to access and use the power management server 20 through the WWW 200 You can perform the authentication procedure for For example, when a user requests authentication information from the WWW 200 through the smart phone 40 , the authentication information request is transmitted to the power management server 20 through the WWW 200 . The power management server 20 transmits authentication code information for authentication to the WWW 200 , and the authentication code information is transmitted to the user's smart phone 40 through the WWW 200 . As such, the authentication code is an authentication code received by the user by requesting the power management server 20 with a smart phone.

When the user transmits the authentication code information of the smart phone 40 to the smart outlet 11 using short-range wireless communication, and the smart outlet 11 approves the received authentication code information, the allowable power information is transferred to the smart phone 40 ) can be sent to Then, the user can recognize the power that can be charged by the user's charging device through the allowable power information received in the smart phone 40, and can charge the vehicle by appropriately manipulating the charging device. In the case of authentication using a smartphone, in the same manner as the user terminal, the smart outlet 11 may perform authentication by checking whether or not forgery is performed through a hash value.

2 is a diagram illustrating a connection between a smart outlet and a user terminal according to an embodiment.

As shown in FIG. 2 , a plurality of user terminals may be connected to each other through short-distance communication in one smart outlet 12 . Connection refers to a state in which direct information transmission/reception is possible between the user terminal and the smart outlet in order to transmit and receive necessary information between the user terminal and the smart outlet, such as authentication code information and allowable power information.

The smart outlet 12 may supply charging power to the electrically connected user terminal within the range of the maximum power supplied from the power supply system 1 300 . For example, each of the user terminals 31-33 transmits authentication code information to the smart outlets 11, 12, 13 through short-distance communication. Among them, as an example, the smart outlet 11 and the user terminal 31 may be encrypted and decrypted according to the asymmetric key method. The smart outlets 11, 12, 13 decrypt each authentication code information through an authentication key (public key) received from each of the user terminals 31-33 to authenticate and distinguish each of the user terminals 31-33, and , it is possible to transmit the allowable power information to each of the user terminals 31-33. For example, even if the user terminal 33 is connected to the smart outlet 11, the user terminal by decrypting the authentication code through the authentication code and the authentication key (public key) combined with the hash value received from the user terminal (33) (33) can be distinguished.

Hereinafter, a smart outlet will be described with reference to FIG. 3 .

3 is a block diagram illustrating a smart outlet according to an embodiment.

As shown in FIG. 3 , the smart outlet 15 includes a power inlet 111 , a power calculator 112 , a power supply 113 , a power outlet 114 , a power suitability determining unit 115 , and a temperature Detector 116, wireless connection unit 117, communication connection unit 118, memory unit 119, authentication code determining unit 120, timer 121, display unit 122, authentication key storage unit 123, and a control unit 124 .

The power inlet 111 may be connected to a power supply system, and power may be supplied to the smart outlet through the power inlet 111 .

The power calculator 112 may detect the voltage and current of the power supply system and periodically calculate the power supplied from the power supply system.

The power suitability determination unit 115 receives information about the current and voltage detected by the power calculator 112, detects the degree of voltage fluctuation versus the current, and compares whether the amount of voltage fluctuation versus the current is within an allowable value, and the electric power suitability can determine whether The power suitability determination unit 115 may transmit the determination result to the control unit 124 . The power suitability determination unit 115 determines that the power of the power supply system is inappropriate when the amount of voltage fluctuation relative to the current is out of the allowable value and informs the control unit 124 of this, and the control unit 124 between the power supply system and the smart outlet 15 A protective action can be triggered to break the connection. This protective operation is performed even when overtemperature is detected by the temperature sensing unit 116 .

The power supply unit 113 may convert the power supplied through the power inlet unit 111 into a rating suitable for charging the user terminal and transmit power to the power outlet 114 . The power extractor 114 may be electrically directly connected to the user terminal. The power supply unit 113 may cut off the power supply under the control of the control unit 124 when the protection operation is started or charging is finished. The control unit 124 may stop the operation of the power supply unit 113 in order to cut off the power of the smart outlet 15 .

The wireless connection unit 117 may connect the user terminal or the user's smart phone and the smart outlet 15 through wireless communication to transmit and receive information. Wireless communication may be implemented as short-range wireless communication, for example, may be one of NFC, Bluetooth, Wi-Fi, and the like.

The communication connection unit 118 may connect the power management server 20 and the smart outlet 15 through an IP address-based wired/wireless network. The communication connection unit 118 may transmit/receive information to and from the power management server 20 through the wired/wireless network 200 .

The display unit 122 is implemented as a conventional display device such as LED, LCD, OLED, etc., and may display information necessary for the user in charging between the user terminals connected to the smart outlet 15 . For example, when the smart outlet 15 is connected to the user terminal or the user's smart phone through wireless communication, the display unit 122 displays a visible display.

The timer 121 may generate time information in units of seconds or milliseconds indicating the current time by counting the lapse of time using an internal clock. The timer 121 may update the current time with the time information transmitted from the power management server 20 , and generate time information in units of seconds or milliseconds based on the updated current time.

The authentication code determining unit 120 may perform authentication by decrypting the authentication code received from the connected user terminal. The authentication code determining unit 120 decrypts the encrypted authentication code with the public key of the user terminal received. The authentication code determining unit 120 extracts a unique number from the decrypted authentication code, and combines the secret code stored in the memory unit 119 with the unique number to calculate a hash value. The authentication code determining unit 120 compares the calculated hash value with the hash value included in the authentication code.

If the hash value comparison result is the same, the authentication code determining unit 120 encrypts the request code generated at the time of production by a predetermined method and stored in the non-volatile memory area of the memory unit 119 with the public key received from the user terminal. The authentication code determining unit 120 transmits the encrypted request code to the user terminal through the wireless connection unit 117 in order to check whether forgery or not.

If the public key received from the user terminal is not forged, the user terminal can normally decrypt the request code received from the smart outlet with the private key. The user terminal decrypts the received request code with the private key, calculates a hash value for the decrypted request code, and transmits it to the smart outlet 15 . The authentication code determining unit 120 encrypts the hash value received through the wireless connection unit 117 of the smart outlet 15 and the request code stored in the memory unit 119, that is, the user terminal with the public key of the user terminal, and transmits it If the hash values for one request code are the same, it is determined that the authentication is valid, otherwise, it is determined that the authentication is invalid (authentication invalid).

This method is a process of determining that the private key, public key, and authentication code of the user terminal are normal, and this process is a process of processing authentication between the user terminal and the smart outlet according to the above-described procedure using a hash value. The private key and public key encrypt information exchanged wirelessly to prevent exposure to third parties, and to prevent unauthorized use of smart outlets by third parties forgery or forgery of user terminals.

In addition, the secret code of the smart outlet for calculating the private key and hash value of the user terminal is stored non-volatile in the memory unit at the manufacturing stage, and is not exposed to the outside through communication, so that a third party hacks the communication and discloses it. Even if the key, authentication code, and hash value are obtained, the above-described series of authentication cannot be normally performed.

In addition, the above-described authentication method of the user terminal and the smart outlet is different from the conventional technology in which unique information is transmitted to the server and approved, and in the prior art, when communication is impossible, the user terminal cannot use the smart outlet or communication There was a problem in that we had to repeatedly request or wait until this became possible. Even when communication is impossible, the user terminal can receive power from the smart outlet, and by not exposing key information to the outside through communication between the server and the smart outlet, it is possible to fundamentally prevent unauthorized theft by a third party.

In addition, since the smart outlet does not need to have information on a plurality of user outlets for authentication, it does not require updates such as additional deletion of user information through communication, and large-capacity It is also possible to solve the problem of placing the memory.

The memory unit 119 includes power information used by the user terminal, authentication code information, time information when the user terminal uses the smart outlet 15, allowable power information received from the power management server 20, and authentication code received from the user terminal Information, identification information (ID) of the smart outlet 15, and the like may be stored. If, while the smart outlet supplies power, when communication with the power management server 20 is not smooth, the power information cannot be transmitted, so the control unit 124 temporarily stores the power information in the memory unit 119, When communication becomes possible, the stored power information may be transmitted to the power management server 20 .

The control unit 124 collects and modulates power information, time information, the suitability of power received from the power suitability determining unit 115, authentication code information, and temperature information sensed by the temperature sensing unit 116, and modulates the wired/wireless network ( 200) so that it can be transmitted. The control unit 124 transmits the data to the power management server 20 through the communication connection unit 118 .

The control unit 124 updates the timer with the time information transmitted from the power management server 20 , and transmits the allowable power information calculated based on the maximum outlet power information received from the power management server 20 to the wireless connection unit 117 . transmits to the user terminal through, stores the power information used by the user terminal received from the power calculation unit 112 in the memory unit 119, and the identification information (ID) of the smart outlet 15 through the communication connection unit 118; Network information, etc. connected to the smart outlet 15 may be transmitted to the power management server 20 . In this case, the identification information (ID) of the smart outlet 15 may be a serial number assigned when the smart outlet 15 is produced. Alternatively, network information to which the smart outlet 15 is connected may include, for example, identification information (ID) of a wired/wireless AP. The power management server 20 may determine the location of the smart outlet 15 by using the network information stored in the power management server 20 .

The control unit 124 transmits the authentication code received by the wireless connection unit 117 to the authentication code determining unit 120, and stores the determination result of the authentication code determining unit 120 in the memory unit 119, and the wireless connection unit It can be transmitted to the power management server 20 through (117).

The control unit 124 stores power information, time information, and authentication code information in the memory unit 119 when communication with the power management server 20 is not possible, and transmits it to the power management server 20 when communication is possible. can be controlled

The control unit 124 determines whether the used power calculated by the power calculation unit 112 is within the allowable power. The control unit 124 calculates the allowable power that can be supplied through the smart outlet 15 based on the allowable power management information received from the power management server 20 , and transmits the allowable power to the user terminal through the wireless connection unit 117 . control to do The controller 124 may cut off the power output to the power extractor 114 when the used power exceeds the allowable power for a predetermined threshold period. Also, as a protective operation, the control unit 124 may cut off the power output even when a low voltage, an overcurrent, or overheat is detected. For example, when an overcurrent flows from the user terminal to the electric vehicle, the used power may exceed the allowable power. When this state is maintained for the threshold period, the controller 124 may cut off the power output to the power extractor 114 .

The control unit 124 stores the temperature value sensed by the temperature sensing unit 116 in the memory unit 119, and stores the detected temperature value in the power management server 20 through the communication connection unit 118 and the wireless connection unit 117. ) and to the user terminal.

The control unit 124 may control the power supplied to the user terminal by sensing the power used, and may release authentication when the use ends.

The authentication key storage unit 123 is a non-volatile memory unit that stores the authentication key of the smart outlet 15 . The authentication key is an asymmetric key, and includes a private key, a private key paired with the private key, and another public key, and information encrypted by the private key can be decrypted by the public key. The smart outlet 15 may transmit information encrypted with the private key of the smart outlet 15 to the server side including the public key so that the server side can decrypt the information.

The smart outlet 15 is in a standby state capable of supplying charging power, when the user terminal is electrically directly connected to the smart outlet and authentication through the above-described authentication process is completed, power can be continuously supplied to the user terminal.

When the user terminal is connected to the smart outlet 15, and power consumption by the user terminal is generated, the smart outlet 15 waits to receive the authentication code of the user terminal. When the authentication code is transmitted from the user terminal, the smart outlet 15 decrypts the authentication code using the public key received from the user terminal, and receives the request code generated during production by a predetermined method and stored in the non-volatile memory. The encrypted request code is transmitted to the user's terminal in order to check for forgery or not by encrypting it with the public key. If the public key received from the user terminal is not forged, the user terminal can normally decrypt the received request code with the private key. The user terminal calculates a hash value for the decrypted request code, and transmits it to the smart outlet 15 . The smart outlet 15 compares the hash value of the request code stored in the smart outlet 15 and the received hash value and, if the same, determines that the authentication is valid, otherwise determines that the authentication is invalid ( certification invalid).

If the authentication for the user terminal is not valid, the smart outlet 15 may supply power to the user terminal only for a predetermined time within a predetermined basic power amount range. If the used power of the user terminal for which authentication is not valid exceeds the predetermined reference power or the usage time exceeds the predetermined reference time, the smart outlet 15 cuts off the power and enters the cut-off state for a predetermined time. can keep

With respect to the power consumed while the smart outlet 15 is connected to the power supply system, the power management server 20 controls the user of the user terminal, the amount of power consumed by the user terminal, and the power supply system to which the smart outlet 15 is connected. information must be grasped. In particular, in order to know the information about the power supply system, the power management server 20 must determine the location of the smart outlet (15).

The prior art used a method such as attaching an NFC tag, a QR code, etc. near an outlet to check the location of electricity use. The power management server detects the location of the NFC tag or QR code given to the outlet and manages it in the database, and when the user recognizes the NFC tag or QR code of the outlet and transmits it to the power management server, the power management server It can be identified based on the received NFC tag or QR code. In this case, a smart phone capable of reading an NFC tag or a separate terminal capable of reading a QR code are required, which has caused inconvenience to the user in charging the electric vehicle. In addition, there are multiple outlets connected to the same power system, and when one of them is in use, the operation of the user terminal is processed so that the other outlet cannot be used. there has been

In contrast, the smart outlet 15 connects to a wired/wireless network, for example, a wired/wireless access point (AP), and transmits the connected, wired/wireless AP ID to the power management server 20 to the power management server 20 . may determine the location of the smart outlet 15 based on the received wired/wireless AP. This method is more convenient for the user than the conventional method in which the user manually reads the NFC tag or QR code to recognize the location of the outlet to be used.

In addition, when the smart outlet 15 is moved and installed, the smart outlet 15 connects to a wired/wireless AP at a newly installed location, and transmits the connected wired/wireless AP ID to the power management server 20 . Then, the power management server 20 can determine the automatically changed location of the smart outlet (15). The wired/wireless AP is installed and used for the purpose of determining the location of the smart outlet as well as the role of the network AP for the smart outlet to communicate with the power management server 20 .

If a plurality of wired/wireless APs exist, for communication between the power management server 20 and the smart outlet 15 , the smart outlet 15 connects to any one of the installed plurality of wired/wireless APs. In order to identify a connected one among the plurality of wired and wireless APs, a unique ID may be assigned to each of the plurality of wired and wireless APs. In this case, the unique ID may be determined by combining a unique serial number for each wired/wireless AP with a fixed ID code. Then, IDs of a plurality of wired and wireless APs do not have duplicate values.

Specifically, when a plurality of wired and wireless APs are installed in a large parking lot and a plurality of smart outlets are installed in the power supply system, for example, when wirelessly accessing the wired/wireless AP, the smart outlet 15 among the plurality of smart outlets is By scanning multiple wired/wireless APs, the wired/wireless AP with the highest radio wave intensity can be accessed first. Alternatively, when the smart outlet 15 is initially installed, a wired/wireless AP having the highest radio wave intensity among a plurality of wired/wireless APs is selected and set using a setting terminal device for installing the smart outlet, and then the wired/wireless AP is connected to the smart outlet It is recorded in the memory unit 119 of (15). Then, the smart outlet 15 can smoothly connect to the wired/wireless AP recorded in the memory unit 119 without scanning.

The power management server 20 receives information including the ID of the wired/wireless AP periodically connected from the smart outlet 15 and the outlet identification information of the smart outlet 15, and the power information supplied by the smart outlet 15. , it is possible to grasp the operating state of the smart outlet 15 .

When a plurality of smart outlets are installed in the same power supply system, the power management server 20 uses the communication network information to which the smart outlet is connected and the identification code of the smart outlet to connect a plurality of smart outlets installed in the same power supply system. It can be set as one group. For example, the power management server 20 receives the wired/wireless AP information connected from the smart outlet and the identification code of the smart outlet together, and analyzes the power information and visual information received from adjacent smart outlets based on the wired/wireless AP. Thus, a plurality of smart outlets connected to the same power supply system can be detected. When power is consumed between a plurality of smart outlets connected to the same power supply system, a voltage waveform may change at the same time, such as a voltage decrease. The power management server 20 may designate smart outlets whose voltage waveform varies at the same time as a group while monitoring a change in the voltage waveform according to the time information based on the time information and the power information.

The power management server 20 calculates the allowable power corresponding to the grid surplus power from the sum of the allowable power information of the power supply system and the power each smart outlet is using, and transmits it to the smart outlet in the standby state in the power supply system. can When there are a plurality of smart outlets on standby, the smart outlet used first uses the allowable power, and the power management server 20 may deduct the power consumption of the corresponding outlet from the allowable power.

When the allowable power is less than or equal to a predetermined value, the power management server 20 may control the remaining smart outlets on standby to supply only the minimum used power. The power management server 20 renews the allowable power of the smart outlet that was on standby, and retransmits the updated allowable power to the smart outlet that was on standby, when the power use of the other smart outlet that was being used is terminated and system surplus power is generated. . When the user terminal is connected to the smart outlet on standby, the user terminal may start supplying charging power.

4 is a diagram illustrating a user terminal according to an embodiment.

As shown in FIG. 4 , the user terminal 34 includes a power input unit 301 , a power calculation unit 302 , a power connection unit 303 , a power output unit 304 , a wireless connection unit 305 , and a memory unit ( 306 ), an authentication code storage unit 307 , an authentication key storage unit 308 , a charging signal processing unit 309 , a charging signal connection unit 310 , and a charging control processing unit 311 .

After the user terminal 34 is connected to the smart outlet and authenticated, it may receive allowable power information and perform a standardized normal charging operation of charging an electric vehicle or the like within the allowable power. When the user terminal 34 connects to the smart outlet, it encrypts the authentication code information with the private key and transmits it to the smart outlet together with the public key, and the smart outlet decrypts the received authentication code using the received public key, and performs authentication. carry out As a result of the authentication, the smart outlet may transmit power information used by the user terminal 34 and usage time information of the user terminal 34 to the power management server 20 .

The user terminal 34 may be a portable charging device, or a user's smart phone may be used instead of the user terminal 34 . When the user terminal 34 is a portable charging device, it can store a unique authentication code and authentication key when it is produced. The authentication code and authentication key are unique information that is recorded in the non-volatile memory unit and does not change after production. The existence of an authentication code means that it is a user terminal that can be used in the production stage.

Since the user's smart phone does not have a unique authentication code, the smart phone may receive the authentication code from the power management server 20 in real time and transmit the authentication code to the smart outlet. The power management server 20 transmits the authentication code transmitted to the smart phone to the smart outlet, and the smart outlet compares the authentication code received from the smart phone with the authentication code received from the power management server 20 to perform authentication. can That is, the smart outlet can supply power to the currently connected charging device if the two authentication codes are the same. The authentication code may disappear from the smart phone, the power management server 20, and the smart outlet after a predetermined elapsed time.

The power inlet 301 includes an outlet plug capable of being combined with a smart outlet and a power transmission wire. Power is supplied to the user terminal 34 from the smart outlet through the power inlet 301 .

The power calculation unit 301 may calculate the supply power by periodically detecting the voltage and current of the power supplied through the power introduction unit 301 .

The power connection unit 303 may transmit or block power supplied through the power inlet unit 301 to the power outlet 304 under the control of the charging control unit 311 . For example, the power connection unit 303 may be implemented as a relay.

The power outlet 304 includes a power cable and a connection device for transferring charging power to the electric vehicle.

The wireless connection unit 305 may connect a smart outlet or a smart phone and the user terminal 34 through wireless communication to transmit/receive information. Wireless communication may be implemented as short-range wireless communication, for example, may be one of NFC, Bluetooth, Wi-Fi, and the like.

The memory unit 306 stores the allowable power information received from the smart outlet.

The authentication code storage unit 307 stores a unique authentication code recorded at the time of production of the user terminal 34 in the non-volatile memory area.

The charging signal processing unit 309 generates a signal indicating that charging power according to the allowable power information can be supplied to the electric vehicle. For example, a CONTROL PILOT signal or a communication signal having a similar function may be generated.

The authentication key storage unit 308 is a non-volatile memory unit that stores the authentication key. The authentication key is an asymmetric key, and includes a private key, a private key paired with the private key, and another public key, and information encrypted by the private key can be decrypted by the public key. The user terminal 34 may transmit the public key to the receiving side so that the receiving side can decrypt information encrypted with the private key. The authentication key for the user terminal 34 is issued at the manufacturing stage, and is non-volatile in the memory unit 306 , and the authentication key information is not leaked to the outside of the user terminal 34 .

The charge control processing unit 311 receives information about the current and voltage detected by the power calculation unit 302, detects the degree of change in voltage versus current, and compares whether the amount of change in voltage versus current is within an allowable value, whether power is suitable can be judged The charging control processing unit 311 may block the power connection unit 303 by determining that the power supplied from the smart outlet is inappropriate when the amount of voltage fluctuation compared to the current is out of the allowable value.

The user terminal 34 may encrypt the authentication code with a public key among the authentication keys of the user terminal in the memory unit 306 of the user terminal 34 and transmit it to the smart outlet 15 .

The power management server 20 stores the public key among the authentication keys of the smart outlet 15 and the public key among the authentication keys of the user terminal 34 , and stores encrypted information from the user terminal 34 and the smart outlet 15 . When received, it can be decrypted.

When the user terminal 34 is connected, the smart outlet 15 performs authentication for the connected user terminal 34, and when the authentication is valid, transmits the allowable power information to the user terminal 34 to the user terminal 34 to perform charging with adequate power.

If the smart outlet 15 fails to authenticate the user terminal, it is determined that the smart outlet 15 is not a user terminal for charging the electric vehicle, and only a predetermined basic power can be used. The basic power may be set to a low power that is not used for charging an electric vehicle. When the accumulated amount of power supplied from the smart outlet 15 exceeds the basic amount of power or the usage time exceeds the basic time, the smart outlet 15 maintains a cut-off state for a certain period of time after cutting off the power supply. . In addition, the blocking state or unauthorized display may be displayed through the display unit 122 of the smart outlet 15, and in this case, a third party may visually identify it. The basic amount of electricity and the basic time may also be set to a small amount of electricity and a short time, not for the use of an electric vehicle. The above operation of the smart outlet 15 may be controlled by the controller 124 .

The smart outlet 15 uses authentication code information received from the user terminal 34, power usage information, network information (WiFi AP) connected to the smart outlet 15, and smart outlet identification information as the authentication key of the smart outlet 15. (eg, a private key) may be encrypted and transmitted to the power management server 20 . The smart outlet 15 may always communicate with the power management server 20 through a wired/wireless network.

The power management server 20 extracts authentication code information and the like by using the public key of the smart outlet 15 stored in the database from the received information. By deleting the procedure of request and use approval between the smart outlet 15 and the power management server 20 in the prior art, the time required for communication between the smart outlet 15 and the power management server 20 can be reduced. and it can solve the problem that the smart outlet cannot be used when communication is not possible. Looking at the conventional charger, a waiting time of several seconds to several tens of seconds is required, and in some cases, it cannot be used due to poor communication. In this case, the user may experience inconvenience such as reconnecting or waiting while not receiving power.

In addition, information that each of the user terminal 34 and the smart outlet 15 can identify each other is transmitted only between the smart outlet 15 and the user terminal 34, and usually uses short-distance communication within several meters for a short time. By doing so, it is possible to prevent information from being transmitted over a complex network, thereby significantly reducing the risk of security exposure. The identification information of the user terminal 34 transmitted to the power management server 20 is encrypted and transmitted by the smart outlet 15 with the private key of the smart outlet 15, thereby securing security.

Instead of an approval method by a power management server, a management center, or the like, which was performed in the conventional online method, in an embodiment, only authentication between the user terminal and the smart outlet is performed, thereby simplifying the authentication procedure. For this authentication, a unique authentication code may be stored in the non-volatile memory unit of the user terminal in the production process of the user terminal, and an authentication code including a hash value is generated in the production stage, so that the forgery and falsification by hacking, etc. It is also possible to prevent unauthorized use of user terminals by making them. The authentication code is encrypted in a mutually unique way between the smart outlet and the user terminal to prevent others from stealing it, and after the user terminal is connected to the smart outlet, the encrypted authentication code is delivered to the smart outlet, and the smart outlet decrypts the encrypted authentication code. And, by performing authentication on the user terminal based on the corresponding authentication code, it is checked whether the user terminal is usable. This can prevent users who cannot use charging services from using power to charge electric vehicles.

The authentication code includes a series of code information uniquely generated in the production process of the user terminal. Even if the authentication code is exposed, without the private key of the user terminal and the secret code of the smart outlet, the authentication code cannot be decrypted or the hash value can be calculated correctly from the authentication code. can't

The authentication key for encryption may include a public key and a private key of a bidirectional method used for personal information protection, and is uniquely stored in a nonvolatile area of a separate memory unit of the user terminal and the smart outlet. User terminals and smart outlets are used in such a way that the private key is not exposed to the outside in any case. The smart outlet's private key is used for encryption when transmitting information to the server. The server decrypts the transmitted information using the public key of the smart outlet.

An operating method of the smart charging system according to an embodiment will be described with reference to FIG. 5 .

5 is a flowchart illustrating a method of operating a smart charging system.

The smart outlet 15 calculates the power used by the user terminal (S1), and periodically transmits the calculated power together with the outlet identification information and network information of the smart outlet 15 to the power management server 20 ( S2).

The smart outlet 15 determines whether the amount of power consumed and supplied from the smart outlet 15 is equal to or greater than a predetermined reference value (S3).

If it is determined in S3 that the amount of power consumption is less than the reference value, step S1 is repeated.

As a result of S3 determination, if the power consumption is greater than or equal to the reference value, it is determined that the user terminal is connected to the smart outlet 15, and the smart outlet 15 and the user terminal are connected through communication (S4).

The user terminal transmits the authentication code and the public key to the smart outlet 15, the smart outlet 15 receives the authentication code and the public key, decrypts the authentication code with the received public key, and authenticates based on the authentication code to perform (S5). The authentication process is the same as described above.

Steps S1-S5 may be performed in a standby state in which the smart outlet 15 can supply power to the user terminal.

The smart outlet 15 determines whether the authentication is valid (S6).

As a result of the determination of S6, if the authentication is valid, the smart outlet 15 may extract the unique number of the connected user terminal from the authentication code (S7).

The smart outlet 15 transmits the allowable power to the user terminal (S8). When the user terminal receives the allowable power from the smart outlet 15, the user terminal may generate a charging signal to the electric vehicle side so that the charging takes place within the allowable power.

The smart outlet 15 calculates the amount of power being used by the user terminal (S9).

The smart outlet 15 determines whether communication with the power management server 20 is possible (S93).

If the determination result of step S93 is communicable, the smart outlet 15 stores or stores power information used by the user terminal, outlet identification information, network information, and user terminal unique number information extracted from the authentication code to the power management server 20 transmit (S10). If the determination result of step S93 is not available for communication, the smart outlet 15 may store the user terminal-specific information information extracted from the power usage information and the authentication code by the user terminal. When communication with the power management server 20 is possible, the smart outlet 15 may transmit the stored power usage information and user terminal-specific information information extracted from the authentication code to the power management server 20 . When charging, which is in a state in which communication with the power management server 20 is impossible, is terminated, the smart outlet 15 uses power to the power management server 20 through a user's portable terminal such as a smart phone registered in the smart outlet 15 . Information and authentication code information can be transmitted. To this end, the user can use and register a mobile terminal such as a smart phone to the power management server 20, and the power management server 20 uses the MAC, device serial number, etc. built into the smart phone. An authentication code is given, and it can be determined whether forgery or not by the hash value of the authentication code.

The smart outlet 15 determines whether communication with the user terminal is terminated (S11). In order to determine whether communication is terminated due to temporary communication failure, the smart outlet 15 may repeat a response request to the user terminal a predetermined number of times, and if there is no response to the repeated request, it may be determined that communication is canceled. .

As a result of the determination in step S11, if the communication is terminated, the smart outlet 15 may release the authentication (S13), and transmit the authentication release to the power management server 20 (S14).

As a result of the determination in step S11, if the communication is not terminated, the smart outlet 15 determines whether the power supply period has elapsed after a predetermined threshold time while the power supplied to the user terminal is less than or equal to a predetermined threshold power (S12). The user terminal is an electric vehicle charger, and when charging is completed, the period in which the power supplied from the smart outlet 15 is maintained in a low state may elapse a predetermined threshold time.

As a result of the determination in step S12, when the period in which the supply power is less than the threshold power elapses the threshold time, the smart outlet 15 determines that the power use by the user terminal has ended, and releases the authentication (S13), and cancels the authentication. It can be transmitted to the management server 20 (S14).

As a result of the determination of S6, if the authentication is not valid, the smart outlet 15 sets the supply power to the minimum power (S15).

The smart outlet 15 is supplied from the smart outlet 15 and calculates the amount of power used by the user terminal (S16).

The smart outlet 15 determines whether communication with the power management server 20 is possible (S163).

If the determination result of step S163 is communicable, the smart outlet 15 stores or transmits power information used by the user terminal, outlet identification information, and network information to the power management server 20 (S17). If the determination result of step S163 is not communication possible (communication impossible), the smart outlet 15 may store power usage information and authentication code information by the user terminal. The smart outlet 15 may transmit the stored information to the power management server 20 when communication with the power management server 20 is possible.

The smart outlet 15 determines whether the power supplied from the smart outlet 15 and used by the user terminal exceeds the basic power (S18).

As a result of the determination in step S18, if the power used by the user terminal exceeds the basic power, the smart outlet 15 cuts off the power (S20), and waits for a predetermined time to elapse (S21). After a certain period of time has elapsed, the smart outlet 15 may reconnect the determined power (S22). The power connector 303 of the smart outlet 15 may be opened in step S21 to cut off power, and may be closed in step S22 to reconnect power.

As a result of the determination in step S18, when the power used by the user terminal does not exceed the basic power, the smart outlet 15 indicates that the accumulated power used by the user terminal exceeds the basic power, or the usage time of the user terminal is a predetermined It is determined whether the basic time has elapsed (S19).

As a result of the determination in step S19, if the accumulated power amount does not exceed the basic power amount and the use time does not elapse the basic time, the process repeats from step S16.

As a result of the determination of step S19, if the accumulated power exceeds the basic amount of power or the usage time exceeds the basic time, the smart outlet 15 cuts off the power (S20) and waits for a predetermined time to elapse (S21).

After a certain period of time has elapsed, the smart outlet 15 is connected to power to enter the standby state (S22). For example, the smart outlet 15 may stop the power supply unit 113 in step S21 , and then operate the power supply unit 113 in step S22 .

6 is a diagram illustrating a power management server according to an embodiment.

The power management server 20 includes a power information receiving unit 21 , an allowable power information transmitting unit 22 , a time information transmitting unit 23 , a database 24 , a power controlling unit 25 , and a used power information communicating unit 26 ). may include

The power information receiving unit 21 is at least one of identification information (ID) of the smart outlet from the smart outlet through the wired/wireless network 100, network information connected to the smart outlet, use time information of the user terminal, and power use information of the user terminal can receive one.

The allowable power information transmitter 22 may transmit the allowable power management information to the smart outlet through the wired/wireless network 100 .

Since a time error may occur in real time inside the smart outlet through the wired/wireless network 100 , the time information transmitter 23 may periodically update the time information and transmit it to the smart outlet.

The database 24 may classify and store the information received by the power information receiver 21 .

When an external server, for example, the payment system 50 requests the user's power usage information from the power management server 20 , the power management server 20 stores the user information in the database 24 and the user's power usage time and power consumption information can be extracted and transmitted. The payment system 50 and the power management server 20 may be connected through the wired/wireless network 100 or may be connected through another communication network.

7 is a diagram illustrating a database according to an embodiment.

As shown in FIG. 7 , the database 24 includes a user database 241 , a smart outlet database 242 , and a power supply system database 243 .

The user database 241 is based on the user information, the user1 DATA ~ users s DATA that classifies each of the user1 ~ users s, the power usage DATA for each user, the usage time DATA, and the user1 authentication key (public key) ~ the user s Contains the authentication key (public key).

Smart outlet database 242, smart outlet 1 DATA (ID, network information) that distinguishes each smart outlet 1 ~ smart outlet m based on the identification information (ID) of the smart outlet, is supplied to the user terminal connected to the smart outlet It may include used power DATA, usage time DATA of the user terminal connected to the corresponding smart outlet, and smart outlet 1 authentication key (public key) to smart outlet m authentication key (public key).

The power supply system database 243, the power supply system 1 DATA to the power supply system n DATA that distinguishes each of the power supply system 1 to the power supply system n, the maximum allowable power DATA of the corresponding power supply system, and connected to the corresponding power supply system Smart outlet 1 ~ used power DATA used by smart outlet k, grid surplus power DATA by subtracting the used power from the maximum allowable power of the corresponding power supply system, smart outlet 1 connected to the corresponding power supply system ~ smart outlet k, smart outlet k+1 to smart outlet k+i, and smart outlet k+i+1 to smart outlet k+i+j Smart outlet 1 DATA to smart outlet k DATA, smart outlet k+1 DATA to smart outlet k +I DATA, and smart outlet k+i+1 DATA to smart outlet k+i+j DATA.

A plurality of smart outlets are connected to the power management server 20 through the wired/wireless network 100 . The power management server 20 may calculate the maximum outlet power of the smart outlets for each power supply system. When there is more than one smart outlet connected to the power supply system, the power control unit 25 deducts the power used by the smart outlets from the maximum allowable power of the power supply system to provide the grid surplus power that the current power supply system can supply. calculated, and based on the grid surplus power, it is possible to transmit the maximum outlet power for the remaining smart outlets. When there is only one smart outlet connected to the power supply system, the power management server 20 may calculate the maximum allowable power of the corresponding power supply system as the maximum outlet power and transmit it.

When a plurality of smart outlets are respectively connected to different power supply systems, the power control unit 25 separates each of the plurality of smart outlets according to the connected power supply system to group smart outlets for each power supply system, and smart outlets for each group The maximum outlet power of the outlet can be calculated.

The power management server 20 calculates the grid surplus power in each power supply system by a difference between the maximum allowable power of each power supply system and the current used power of each power supply system.

The power management server 20 may periodically calculate the maximum outlet power of the smart outlets and transmit it to the smart outlets. The power control unit 25 uses smart outlet identification information (ID) and network information to which the smart outlet is connected among the information received by the power information receiving unit 21 periodically at every time, the location recorded when the smart outlet is installed Information, connected power supply system information, and maximum allowable power information of the corresponding power supply system may be acquired, and the power information used by a smart outlet connected to the same power supply system may be updated.

The power control unit 25 may calculate the grid surplus power by summing the used power of each smart outlet for each grid and subtracting the summed used power from the maximum allowable power. The power control unit 25 calculates the maximum outlet power for each of the smart outlets connected to the corresponding power supply system within the grid surplus power range.

The unique supply power of the standby smart outlet depends on the electrical specifications of the smart outlet. The power control unit 25 transmits allowable power management information to update the maximum outlet power of each smart outlet when the system surplus power is insufficient than the sum of the unique supplyable power of the smart outlets on standby. In this case, the power control unit 25 may determine the allowable power management information of each smart outlet in consideration of the grid surplus power and the unique supplyable power of each smart outlet.

For example, the power control unit 25 may determine the allowable power management information based on a ratio between the sum of the inherent supply power to the grid spare power. When the ratio is 0.9, the power control unit 25 may calculate a value obtained by multiplying the unique supply power of each smart outlet by 0.9 as the maximum outlet power, and determine the calculated maximum outlet power as the allowable power management information. This is an example for explaining the invention, and the invention is not limited thereto.

The power control unit 25 transmits the maximum outlet power for each of the plurality of smart outlets to the allowable power information transmitting unit 22, and the allowable power information transmitting unit 22 may transmit it to the smart outlet through the wired/wireless network 100. have.

The power usage information communication unit 26 reads information necessary for billing and settlement from the database 24 under the control of the power control unit 25 and transmits it to the payment system 50, and from the payment system 50 to the payment completion information can be received.

A normal outlet is installed and used in a facility for the purpose of supplying electricity on a daily basis. In the case of an outlet installed in a parking lot of an apartment building, the purpose is to use electricity when necessary, and for example, it can be said that it is suitable for the purpose of installing an outlet, for example, to not be restricted by the use of a vacuum cleaner for parking lot facility management. In the case of such electricity use, it is reasonable for households to pay electricity bills separately at the common electricity rate. In some cases, charging electric scooters with low power consumption in a parking lot is not effective in terms of cost because the cost to prevent the use of electricity and the cost and time required to allow the use of electricity may be lower than the used electricity rate. It can cause inconvenience on a daily basis to cut off electricity used for purposes such as management of common facilities.

However, in the case of an electric vehicle, the amount of power used for charging and the duration of power consumption may be excessive to bear with shared electricity, and since it is likely to be used repeatedly, the cost of charging the electric vehicle is not charged to the user of the electric vehicle. It is unreasonable for the majority to share the cost.

The prior art is a technology implemented by focusing on a method for preventing “conduction”. If inconvenience in real life is caused by the prior art, it is not reasonable because it does not meet the installation purpose of the original outlet, and also costs money to perform a procedure for using power.

The smart outlet according to an embodiment supplies power all the time to solve this inconvenience, but limits the power size, power supply amount, and power supply time. When power consumption is large, such as in an electric vehicle, the smart outlet performs authentication based on the received authentication code, and when authentication is valid, the smart outlet supplies allowable power to the user terminal.

In addition, the smart outlet supplies allowable power that can be used to a user terminal such as a portable charger based on the available power, so that an overload occurs in the power supply system, or a problem that occurs as an electrical load even when a plurality of user terminals are used can be prevented in advance.

A portable charger usually uses a relatively large capacity of 1-3KW, and in some cases, a large-capacity of 6-7kW can be used. Conventionally, in this case, the moment when connected to the outlet, the overcurrent circuit breaker operates, leads to overheating of the outlet, or heat generation of the wiring, which may cause safety problems and deterioration of durability of the outlet, wiring, and the like. The smart outlet according to an embodiment may continuously deliver a lot of power within the allowable power to block the occurrence of overcurrent and provide a charging method through effective power delivery.

In addition, recently, in the process of information transmission through wireless networks such as IoT communication and cloud communication, problems such as information being tampered with or personal identification information being exposed by hacking have occurred. Due to these problems, it is recommended to use a high level of information security for IoT communication at home and abroad. In addition, in order to remotely transmit usage authentication information, billing and settlement information, etc., not only a wireless network, but also complex wired network equipment and lines are used, and a problem of information exposure may occur in this process. If electricity is used illegally through hacking, financial damage may occur, and if it is altered with stolen information, unwanted malfunctions may occur.

In the present invention according to an embodiment, the wireless communication between the user terminal and the smart outlet and the wired/wireless network between the smart outlet and the power power management server are separated, and the authentication information of the user terminal can be prevented from being directly transmitted to the power management server. have.

In addition, when a user, not a user terminal, wants to use power from a smart outlet using a smart phone, access the power management server through the communication function built into the smart phone to receive an authentication code and receive a smart outlet It can be used by sending an authentication code to In this case, the authentication code may include a property of a volatile authentication code that cannot be used after a certain period of time has elapsed.

Conventionally, it is assumed that communication with the electric vehicle's charging power management server or management center is always performed, and an outlet and a charger are technically implemented. However, in real life, communication is not smooth, and when the power management server or the management center is not normal, the use request-approval procedure does not proceed smoothly or takes time.

For example, when you want to charge an electric vehicle, after the user terminal is connected to the smart outlet, it receives the allowable power information from the smart outlet, and the user terminal sends a signal / corresponding to the charging power to the electric vehicle within the received allowable power. information will be generated. The signal/information on the charging power transmitted from the user terminal to the electric vehicle is the same as the standard charger method.

Through the above process, the electric vehicle can be charged within the allowed power, thereby preventing the occurrence of an overload in the power supply system and the smart outlet. The smart outlet according to the transmits the allowable power to the user terminal, and the user terminal can automatically set the charging power according to the allowable power information. Then, the user eliminates the hassle of manually setting the charging power of the terminal, and side effects such as overheating, burnout of the outlet, and power outage caused by the operation of the wiring breaker that can occur when excessive power is delivered to the electric vehicle by mistake in operation can prevent

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art to which the present invention pertains are also rights of the present invention. belong to the scope

1: Smart charging system
11-15: Smart outlet
20: power management server
30-34: user terminal
100: wired and wireless network

Claims (30)

In the smart outlet for supplying power to the user terminal,
a wireless connection unit for receiving an authentication code from the user terminal;
an authentication code determining unit for performing authentication by decoding the received authentication code; and
When the authentication of the received authentication code is valid, the smart outlet calculates the allowable power for the user terminal according to the maximum outlet power that can be supplied, and a control unit that transmits the allowable power to the user terminal through the wireless connection unit Including, smart outlet. According to claim 1,
a power calculator that detects the voltage and current of the power supply system and periodically calculates power supplied from the power supply system;
a power suitability determination unit that receives information on the current and voltage detected by the power calculator, detects a degree of change in voltage versus current, and determines whether power is suitable by comparing whether the amount of change in voltage versus current is within an allowable value;
a wireless connection unit for transmitting allowable power information by connecting to the user terminal through wireless communication;
a communication connection unit for receiving allowable power management information from a power management server through the wired/wireless network;
an authentication code determining unit for performing authentication by decoding the authentication code; and
A smart outlet comprising a control unit for generating the allowable power information that can be supplied based on the allowable power management information. 3. The method of claim 2,
a timer for generating information on the current time and updating the current time with the time information transmitted from the power management server; and
At least the power information used by the user terminal, the authentication code information, and the user terminal further comprises a memory unit for storing the time information using the smart outlet,
The control unit is
A smart outlet that processes the at least the power information, the time information, and the authentication code information so that the communication connection unit can transmit it to the power management server through the wired/wireless network. 4. The method of claim 3,
The control unit is
When communication with the power management server is not possible, the at least the power information, the time information, and the authentication code information are stored in the memory unit and transmitted to the power management server when communication is possible, a smart outlet. 3. The method of claim 2,
The control unit is
A smart outlet for transmitting at least one of identification unique information of the smart outlet and network information to which the smart outlet is connected, and a result of determining validity of the received authentication code to the power management server through the wireless connection unit. 3. The method of claim 2,
The control unit is
A smart outlet that determines whether the used power calculated by the power calculator is within the allowable power, and blocks the power output when the calculated used power exceeds the allowable power for a predetermined threshold period. According to claim 1,
Further comprising an authentication key storage unit for storing the authentication key of the smart outlet,
The authentication key is an asymmetric key, and includes a private key and a private key paired with the private key and another public key. According to claim 1,
If the authentication for the user terminal fails, the user terminal controls to use only a predetermined basic power, and when the accumulated amount of power supplied from the smart outlet exceeds the basic amount of power or the usage time exceeds the basic time, power A smart outlet that remains disconnected for a certain period of time after shutting off the supply. In the authentication method between the user terminal and the smart outlet,
decrypting, by the smart outlet, the authentication code received from the user terminal using the public key received from the user terminal;
calculating, by the smart outlet, a hash value by extracting a unique number from the decrypted authentication code and combining the secret code stored in the unique number;
Comparing, by the smart outlet, the calculated hash value and the hash value included in the authentication code;
encrypting, by the smart outlet, the request code stored in the smart outlet with the received public key when the hash value comparison result is the same, and transmitting the encrypted request code to the user terminal; and
An authentication method between a user terminal and a smart outlet, comprising, by the smart outlet, receiving a hash value for the request code from the user terminal, and comparing the received hash value with a hash value for the stored request code . In the authentication method between the user terminal and the smart outlet,
transmitting, by the user terminal, an authentication code and a public key to the smart outlet;
receiving, by the user terminal, a request code encrypted with the public key from the smart outlet;
decrypting, by the user terminal, the encrypted request code with a private key; and
An authentication method between a user terminal and a smart outlet, comprising generating a hash value for the decrypted request code and transmitting it to the smart outlet. 11. The method of claim 10,
The verification code is
An authentication method between a user terminal and a smart outlet, including a hash value for the unique number of the user terminal and a value in which the unique number and the secret code are combined, and encrypted by the private key. In a user terminal for charging an electric vehicle by receiving power from a smart outlet,
a power calculator for periodically detecting the voltage and current of power supplied from the smart outlet to calculate the power supply;
a wireless connection unit for receiving allowable power information by connecting to the smart outlet through wireless communication;
a charging signal processing unit generating a signal indicating that charging power according to the allowable power information can be supplied to the electric vehicle; and
Receiving the information on the detected current and voltage, detecting the degree of change in voltage versus current, and comparing whether the amount of change in voltage versus current is within an allowable value, and a charging control processing unit for determining whether power is suitable, user terminal. 13. The method of claim 12,
an authentication code storage unit for storing a unique authentication code recorded during the production of the user terminal; and
Further comprising an authentication key storage unit storing the authentication key of the user terminal,
The authentication key is an asymmetric key, and includes a private key and a private key paired with the private key and another public key. 14. The method of claim 13,
The user terminal encrypts the authentication code with the public key, and transmits the encrypted authentication code together with the public key to the smart outlet. In the power management server for controlling at least one smart outlet connected to the power supply system,
a power information receiver configured to receive at least one of identification information of a smart outlet, network information connected to the smart outlet, usage time information of a user terminal, and power usage information of the user terminal from the at least one smart outlet through a wired/wireless network;
a database for classifying and storing information received by the power information receiver; and
The system surplus power of the power supply system is calculated by subtracting the used power of the at least one smart outlet from the maximum allowable power of the power supply system, and the maximum outlet for the at least one smart outlet based on the system surplus power A power management server comprising a power control unit for calculating power. 16. The method of claim 15,
The power management server further comprising: an allowable power transmission unit for transmitting allowable power management information indicating the maximum outlet power to the at least one smart outlet through a wired/wireless network. 16. The method of claim 15,
The power control unit,
The at least one smart outlet includes a plurality of smart outlets,
When the grid surplus power is insufficient among the plurality of smart outlets than the sum of the intrinsic supplyable power of the waiting smart outlets, the allowable power management information of each smart outlet in consideration of the grid surplus power and the unique supplyable power of each smart outlet A power management server that determines and updates. 16. The method of claim 15,
The power control unit,
Periodically, using the identification information information of the at least one smart outlet and the network information to which the at least one smart outlet is connected, the location information recorded when the at least one smart outlet is installed, the connected power supply system information, the corresponding Obtaining the maximum allowable power information of the power supply system, and updating the power information being used by the at least one smart outlet, a power management server. 16. The method of claim 15,
The power control unit,
When the at least one smart outlet includes a plurality of smart outlets, a plurality of smart outlets installed in the same power supply system using communication network information connected to the plurality of smart outlets and identification information of the plurality of smart outlets power management server to set as a group. 20. The method of claim 19,
The power control unit,
Based on the power usage time information and power information for each of the plurality of smart outlets, while monitoring the change in the voltage waveform according to the power usage time information, setting the smart outlets whose voltage waveform varies at the same time into a group, power management server. When the user terminal is connected to the smart outlet, the smart outlet performs authentication based on the authentication code received from the user terminal;
determining, by the smart outlet, whether authentication is valid;
transmitting, by the smart outlet, allowable power to the user terminal when the authentication is valid;
when the authentication is not valid, the smart outlet setting the supply power to the minimum power;
calculating the amount of electric power supplied by the smart outlet from the smart outlet and used by the user terminal;
determining, by the smart outlet, whether power supplied to and used by the user terminal exceeds a basic power when the authentication is not valid; and
When the authentication is invalid, when the power used by the user terminal exceeds the basic power, the smart outlet cuts off the power, and the step of waiting for a predetermined time to elapse, the smart charging method. 22. The method of claim 21,
calculating the power used by the smart outlet by the user terminal;
periodically transmitting the socket identification information of the smart outlet, network information, and the calculated power to a power management server;
Determining whether the amount of power consumed by the regular smart outlet supplied from the smart outlet is greater than or equal to a predetermined reference value; and
If the power consumption is greater than or equal to the reference value, determining that the user terminal is connected to the smart outlet, and further comprising the step of connecting the smart outlet and the user terminal through communication. 22. The method of claim 21,
If the authentication is not valid and the power used by the user terminal does not exceed the basic power, the smart outlet determines that the accumulated power used by the user terminal exceeds the basic power, or determining whether the usage time has passed a predetermined basic time; and
The smart charging method further comprising: when the accumulated amount of power exceeds the basic amount of electricity, or when the use time elapses the basic time, the smart outlet cuts off the power and waits for a predetermined time to elapse. 22. The method of claim 21,
determining, by the smart outlet, whether a power supply period has elapsed after a predetermined threshold time while the power supplied to the user terminal is less than or equal to a predetermined threshold power when the authentication is valid; and
When the period in which the supply power is equal to or less than the threshold power elapses the threshold time, the smart outlet determines that power use by the user terminal has ended, releases authentication, and transmits the authentication release to the power management server A smart charging method further comprising the step of: 25. The method of claim 23 or 24,
determining whether communication between the smart outlet and the power management server is possible;
transmitting, by the smart outlet, information on power used by the user terminal, the outlet identification information, the network information, and unique number information of the user terminal, to the power management server if the determination result is communicable; and
If the determination result is not available for communication, the smart outlet further comprising the step of storing the power use information and the authentication code information, smart charging method. 24. The method of claim 23,
determining whether communication between the smart outlet and the power management server is possible;
If the determination result is not available for communication, the smart outlet storing the power use information and the authentication code information; and
If the determination result is maintained in a non-communicable state, the smart outlet further comprising the step of transmitting the used power information and the authentication code information stored by the smart outlet to the power management server through a registered user portable terminal, smart charging method. 22. The method of claim 21,
transmitting, by the smart outlet, information on power used by the user terminal, the outlet identification information, the network information, and unique number information of the user terminal to the power management server;
determining whether the smart outlet terminates communication with the user terminal;
When the communication is terminated, the smart outlet releases the authentication, and further comprising the step of transmitting the authentication release to the power management server, smart charging method. 22. The method of claim 21,
When the user terminal receives the allowable power from the smart outlet, the user terminal further comprises generating a charging signal to the electric vehicle to be charged within the allowable power. In a smart charging method using a smart outlet and a power management server connected through a wired/wireless network,
receiving, by the power management server, a request for authentication information for use from a user's smart phone;
transmitting, by the power management server, authentication code information for authentication to the smart phone;
receiving, by a smart outlet, the authentication code information from the smart phone; and
When the smart outlet approves the authentication code information, comprising the step of transmitting allowable power information to the smart phone, a smart charging method. 30. The method of claim 29,
receiving, by the smart outlet, the authentication code from the power management server; and
Comparing the authentication code received from the power management server with the authentication code received from the user smart phone by the smart outlet further comprising the step of authenticating, the smart charging method.

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