SK16632000A3 - Method for transmitting and storing value and value store electric power meter using the same - Google Patents

Abstract

A value store electric power meter is provided. The server of an electric power supplier, an electric power seller, or an electric power reseller transfers value through an electric power line through a built-in electric power modem, stores value received through the electric power modem inside the value store electric power meter in a value store module, reduces a value according to the amount of electric power consumption, omits processes of visually reading a meter, calculating the amount of use, printing and mailing a bill, settling up, and paying an uncollected amount and arrears. Accordingly, it is possible to save electric power supplying costs, to reduce the electric power rate by a user, and maximizing the profit of the electric power supplier. The electric power meter is used for IC card payment type gas and water meters in which the IC card having credit value is transferred and stored in an off-line state. Accordingly, the electric power value and the added value measurement is easily and rapidly performed. Therefore, it is convenient for the user and remarkably reduces all the costs.

Description

A method for transmitting and storing a value and a storing value meter using said method

Technical field

The invention relates to a value storage meter according to a new concept, more particularly to a value storage method by which a power supply or power supply server transmits value via a power line modem and stores a value in a value storage module (SVM) or on a smart card, and electricity meter for prepaid and direct payments without the need for meter reading.

BACKGROUND OF THE INVENTION

Doposiaľ-. is. a. All institutions, where-sa.-consumed, electricity, such as households, offices and public buildings, used a conventional electricity meter to measure the electricity consumed according to the principle of watts consumed per hour read by the authorized personnel. This first generation of electricity meters is controlled in a very complex and costly way, where the worker visits places where electricity meters are installed in households and businesses and controls the difference between the amount of energy consumed in the previous measurement and the amount of energy at that point of measurement. surveys consumption per month or other period. The supply and consumption calculation is performed by the supplier, who, after calculating the data input and calculating the quantity consumed, prints the bill and sends it to the customer. He will receive a request for payment. The account must then be resubmitted to handle arrears and unrecoverable payments.

However, fraudsters sometimes impersonate the workers concerned and, in addition, the cost of metering greatly increases the cost of electricity supply as a result of the expenditure per person in charge. Therefore, as the new ·· ···· ···· ·· • · · · • · · · · · · · · _Α measurement procedures considered remote electric meter, which is the second generation product and which have not yet been widely used. However, the amount consumed needs to be processed on a computer each month, an account sent, and an outstanding balance. In particular, both suppliers and consumers avoid the use of remote meters such as gas and water meters, which require additional power and communication lines, eg. telephone or radio line. This is due to increased costs due to the interconnection between gas and water meters, the remote metering server and the installation and operation of the communication equipment after the communication function has been connected to the remote metering.

Therefore, a third-generation electricity meter for smart card payment may be considered where visual measurement is not necessary. The electricity meter for smart card payment can to some extent solve the problems of the first and second generation electricity meters. However, the efficiency of the electricity meter for smart card payment is dependent on how to recharge the card and calculate the value information on the smart card. Especially if the power supply is disconnected due to the complete consumption of the value information on the chip card, an unexpected failure may occur.

SUMMARY OF THE INVENTION

A first object of the invention is to show a method for transmitting and storing a value in which the server of the electricity supplier or electricity retailer communicates with the meter to store the value of each customer, stores the value in the value storage module (SVM) inside the meter according to the invention added credit value and stores information about any credit value in the chip card. Thus, suppliers or vendors generate high added value for consumers by increasing management efficiency and significantly reducing electricity prices.

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A second object of the invention is to provide a process for storing a value on a smart card by which the credit value information transmitted via a power line modem can be used for all meters such as gas meters, water meters and calorimeters for measuring thermal energy installed and operated off-line in households and businesses.

A third object of the invention is to provide a storage meter that can be used by an electricity supplier or vendor to increase communication management efficiency with a verified agency host computer by using a power line modem and transmitting credit value information and storing credit value information on a smart card. Thus, it is possible to reduce the cost of electricity to the consumer by substantially reducing the ancillary costs of electricity supply, also by avoiding the need to enter and calculate the amount of electricity consumed over a period of time, since a server is used to print accounts and send and recalculate accounts.

A fourth object of the present invention is to provide a value storage meter that can solve all the problems of first, second and third generation electricity meters by comfortable and simple charging and charging of value and value added on a smart card using a value charging channel. The storage meter can therefore be applied to a variety of meters, such as a gas meter, water meter and calorimeter. This makes it possible to make the various processes as efficient as possible.

To achieve these goals, an electricity meter is stored to communicate with the electricity supplier's server via the power line modem contained in the electricity meter, store value information in the meter's storage module, calculate the value based on the amount of electricity consumed, and stop delivery electricity, when the credit value is completely depleted.

One aspect of the invention is directed to a method for storing credit information in a value storing module in an electricity meter with value storage based on communication between the host computer and each terminal via a terminal. ⁴ '' modem for a high-power line which is in a value-storing electricity meter that is a terminal, comprising the steps of:

(a) generating the first random data by the host computer, sending the first random data to the terminal, generating a session key by the key generation algorithm using the internal secret of the terminal, generating the first signature value by the signature generation algorithm for comparison during terminal authentication; Create a session key in the same way as on a host computer

b) generating a second signature value by an algorithm to generate a second random data signature and sending the second random data to the host computer;

c) comparing the first and second signature values and the authentication of the terminal by the host computer, wherein the host computer generates a third signature value and sends a third signature value to the terminal with the monetary information, the third signature value and the monetary information from the host computer creating a fourth signature value and authenticating the host computer by comparing the third and fourth signature values, and

d) increasing the value of the terminal after decrypting the money information and sending the value obtained by encrypting the balance and terminal ID using the encryption algorithm to the host computer, receiving the encrypted value by the host computer, decrypting the encrypted value, comparing the stored terminal ID with the decrypted terminal, After authentication, back up the balance in the log file.

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Another aspect of the invention provides a storage meter comprising an input and output terminal of a power line for measuring the amount of power consumed, comprising an operating portion of power consumption to measure the voltage and current of the power line and calculating power consumption and a power line modem for data communication between host computer and terminal via power line. It also includes a security part consisting of a Security Access Module (SAM) and a Basic Processor (CPU), an encryption key and a value storage encryption algorithm, and a value storage module (SVM) to prevent value information from being compromised and disrupting the system. a SAM authentication process, a latch relay to interrupt the power supply according to the rest in the SVM, and a value changer for the SVM token request are required. This works by inputting value information from the SVM according to the amount of electricity consumed per unit of time, and when the internal mark is exhausted, the SVM requests a new mark to the stack.

Preferably, the storage meter further comprises a chip card reading and recording portion allowing its use for other meters such as water meters, gas meters and calorimeters. This is done by inserting the smart card into the meter, receiving the value from the host computer in the online mode, recording the received value on the inserted smart card, and reading the received value from the smart card.

The chip card reading and recording portion is preferably used for water meters, gas meters and heat meters operating with the chip card offline, by recording the added value to the chip card via the modem e.g. for gas and water, and the card can store electrical power based on the communication port. It contains eight terminals defined by ISO 7816, Part 2, with Vcc, Clk,

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DIO, Reset and Gnd for synchronous and asynchronous communication with the smart card.

The stored value meter further preferably comprises an AC / DC converter for supplying the operating voltage required for the meter, an energy consumption sensor indicating a normal power usage condition when the sensor input is 0, and when the sensor is 1, the terminals are locked and electricity is taken in an unauthorized manner. It also includes a buzzer to generate an audible alarm prompting the user to receive the last stamp, requesting a new stamp from SVM, and exhausting the balance in the stamp changer to convert and store the value.

Preferably, the operating portion of the power consumption system includes an AC shunt, a voltage divider for series connection of two resistors, and a choice of a voltage range given by the ratio of the two resistors to accommodate the AC line voltage within the voltmeter input voltage range. shunt current to a 16- or 20-bit digital signal and an analog-to-digital converter for converting AC voltage to a 16-bit digital signal, the voltage phase being compared to the current phase and calculating the angle by which the two phases are relative to each other shifted, and output as a signal for applying differentiated rates.

Preferably, the storage meter further comprises a power consumption table in the form of a 50%, 75%, 100%, 150%, and 200% power tariff mode table based on supply and power based on real-time clocks containing a year, month, time, minutes and seconds.

The storage meter preferably comprises a non-volatile memory in which the characteristic 3 bytes of the ID number are stored and the recorded state of electrical power over a certain number of hours, days, or hours. Months to remotely monitor unauthorized or atypical electricity consumption and perform the electronic seal function.

The storage meter preferably includes a liquid-crystal display to visually display the existing value, the value conversion, the real-time power consumption status, and the states in which the accumulated power is used.

The value-added electricity meter, which can be used as a means to easily and reliably charge fees through the Electronic Business Transaction (SET) process using the next generation of EMV'96 credit and direct payment cards in combination with a smart card reader / recorder, is a telephone, Internet, P-ATM terminal (EMV'96) and digital intercom. It is used for audio communication with the person who serves the host server, or sends an audio message that helps the user eg. with data input and keyboard device for the user who wants to save the value directly.

The input and output of electrical energy into the (z) value-added electricity meter, has a cover and a physical seal against violent intrusion, prevents unauthorized and atypical electricity consumption.

The storage meter further preferably includes a lightning arrester circuit for absorbing lightning or shock voltage on the supplier's power line.

The stored value electricity meter may preferably request a voice message from the operator using the loudspeaker and keypad switch of the intercom device. The carrier supports the procedures for transferring and storing the credit value by transmitting the voice service to the subscriber.

Description of the drawings

The foregoing objects and advantages of the invention will be more readily understood by providing a detailed description of the preferred embodiment with reference to the accompanying drawings.

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Fig. 1 is a flowchart showing a process for transmitting and storing a value according to the invention.

Fig. 2 is a flowchart showing the progress of the correction commands of the multi-stage differentiated charging mode (change of the electricity charging system) after hours, days, months and time intervals applied to the stored value meter according to the invention.

Fig. 3 is a flow chart illustrating procedures for monitoring atypical power consumption, such as monitoring and preventing unauthorized consumption by comparing the total energy used by a customer on an electricity meter of the invention per unit of time, such as days, weeks or months, with total power consumption per unit of time .

Figure 4 schematically illustrates the signature creation process and encryption process used in accordance with the invention.

Figure 5 is a block diagram illustrating the internal structure of a stored value meter according to the invention.

Figure 6 shows a structure of a system according to the invention for describing a value information flow.

Figure 7 is a broken perspective view of an external view of a value storing electricity meter according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, a value transfer and storage process according to a preferred embodiment of the invention and a structure and operation of the storage meter will be described in more detail in which it is not necessary to perform a visual reading.

The invention can be applied to an electricity meter, gas meter, water meter and calorimeter using procedures for calculating direct payment and prepay in combination with the electronic wallet method. For simplicity, the invention will be limited to an electricity meter. In all communication procedures for transmission. The basic triple DES encryption algorithm is used to store the value according to the invention. The communication between the host server and the electricity meter is as follows. The server and terminal first create a session key (Ks). A triple DES encryption algorithm is used while the session key is running. Also, when it is necessary to create a signature, MAC BCD (encrypted text chaining) is applied using triple DES. When the values are stored in the meter terminal, the electricity billing calculation mode table and the time required for repairs are saved. After reading the values from the terminal of the meter, the credit balance, date, month and year of consumption, the table of calculation of the power consumption calculation, the unit of account and the timer are counted, giving information for possible detection of unauthorized consumption.

Before the value transfer and storage procedure of the present invention is described, examples of generating a signature and an encryption algorithm used with reference to Figure 4 will be provided.

After the server and the terminal accomplish the session key (Ks) task by using the communication between the server and the stored value meter, the triple DES encryption algorithm is used during the session key (Ks). A MAC BCD using a triple DES can be used to create a signature. Hereinafter, the signature creation and encryption algorithm will be described with reference to Figure 4.

When creating the signature, the original data sizes are determined based on padding in step 1 as multiples of 64 bits. This is Di ..... D _N in the picture

4. In step 2, the data values (D _N ) of 64 bits after application of the DES DES algorithm are encrypted as F according to the input key (K). The signature values are labeled Oi, .... in step 3. On · At this point, the values obtained by adding individual data values (D _N ) to the signature values (O _N -i), with the exception of the first signature value Oi, are encrypted as F.

For encryption purposes, the original data sizes are determined by the padding in step 1 as multiples of 64 bits. That's Di, .... D _N. In Step 2 ································· · A triple DES algorithm is applied to F encryption. The encrypted messages are labeled Oi, .... and On in step 3.

The host computer master key (KH), the internal secret key (KT) of each terminal, and the session secret key (Ks) operating in the communication process, each 128 bits in size, are used. The terminal's internal key (KT) is formed from the host computer's master key (KH). A session key (Ks) is formed from the internal terminal key (KT). The host computer master key (KH) and the terminal internal key (KT) are randomly selected from different sets.

The terminal's internal key (KT) is formed by encrypting the terminal ID with a triple DES algorithm and using the host computer's master key (KH). The internal key is stored in the terminal during the generation step and is created on the host computer at an early stage of communication. Specifically, KT = Encrypt (ID.KH).

The session key (Ks) is always formed during communication by encrypting random numbers R generated by the host computer by the triple DES algorithm using the terminal internal key (KT). All encryption is performed in the communication process using session key (Ks). Specifically, Ks = Encrypt (R, KT).

The invention uses 1) a value store command, 2) a differentiated billing mode control command by hours, days, months or periods, and 3) a usage information for days, weeks, or months a command and a timer to check information (to track unauthorized subscription). These will be described with reference to Figures 1 to 3.

Referring to Figure 1, the operation of the save command will first be described.

Step 10: The host computer generates the first random data (R1, R2 and n) and sends the first random data to the terminal. A session key is created using the internal terminal secret key (KT [n]). Specifically, Ks = Encrypt (R, KT [n]). For comparison in terminal authentication, the first signature value S1h = Sig (R2, Ks) is generated according to the signature generation algorithm. The terminal receives the first random data (R1, R2, and n) and creates a session key as in the case of ········ ··· ····························································································· . Specifically, Ks = Encrypt (R1, KT [nj).

Step 12: The terminal generates a second signature value by the signature generation algorithm S11 = Sig (R2, Ks), the second random data R3, and sends S11 and R3 to the host computer.

Step 14: The host computer may perform terminal authentication to compare S1h and S1t. When the terminal is authenticated, the host computer generates a third signature value S2h = Sig (H + R3 + EnAmnt, Ks) and sends S2h to the terminal along with the encoded total amount of money (EnAmnt). Contains an H header, which means a command to store a value. The terminal creates a fourth signature value S2t = Sig (H + R 3 + EnAmnt, Ks) and performs host computer authentication by comparing S2h and S2t.

Step 16: After the host computer is authenticated, the terminal increments the value, encrypts the rest, i. Balance + ID, such as M = Encrypt (Balance + ID, Ks) and sends the encrypted M value to the host computer. After decrypting the encrypted value M as Balance '+ ID' = Decrypt (M, Ks) and comparing the ID with the ID ', the host computer performs a new terminal authentication.

The differentiated charging mode control command flow by hours, days, months and periods (charging system) will be described with reference to Figure 2.

Step 20: The host computer generates the first random data (R1, R2 and n) and sends the first random data to the terminal. The key generation algorithm creates a session key using the secret key (KT [nj). Specifically, Ks = Encrypt (R1, (KT [nj). For comparison in terminal authentication, the signature generation algorithm creates the first signature value S1h = Sig (R2, Ks). The terminal receives the first random data (R1, R2 and n) and creates the session key in the same way as the host computer using the internal secret of the terminal (KT [nj). Specifically, Ks = Encrypt (R1, (KT [n]).

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Step 22: The terminal generates a second signature value S11 = Sig (R2, Ks), a second random data (R3) by the signature generation algorithm, and sends St1 and R3 to the host computer.

Step 24: The host computer may perform terminal authentication to compare S1h and S1t. When the terminal is authenticated, the host computer creates a third signature value S2h = Sig (H + R3 + Mode + Unit, Ks) and sends the third signature value to the terminal along with mode information and billing unit information. The terminal generates the fourth signature value S2t = Sig (H + R3 + Mode + Unit, Ks) and performs authentication of the host computer after comparing S2h and S2t.

Step 26: After the host computer is authenticated, the terminal executes the billing system, encrypts the rest, i. Balance + ID, such as M = Encrypt (Balance + ID, Ks) and sends the encrypted M value to the host computer. After decrypting the encrypted value M as Balance '+ ID' = Decrypt (M, Ks) and comparing ID 's ID, the host computer performs a new terminal authentication. After the terminal is authenticated, the remainder is stored in the log file.

Finally, the use of days, weeks or months and the command to check the timer information (to monitor unauthorized subscription) will be described in detail with reference to Figure 3.

Step 30: The host computer generates the first random data (R1, R2 and n) and sends the first random data to the terminal. The key generation algorithm creates a session key using the secret key (KT [n]). Specifically, Ks = Encrypt (R1, (KT [n]). For comparison in terminal authentication, the signature generation algorithm creates the first signature value S1h = Sig (R2, Ks). The terminal receives the first random data (R1, R2 and n) and creates the session key in the same way as the host computer using the internal secret of the terminal (KT [n]). Specifically, Ks = Encrypt (R1, (KT [n]).

Step 32: The terminal generates a second signature value S11 = Sig (R2, Ks), a second random data (R3) by the signature generation algorithm, and sends St1 and R3 to the host computer.

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Step 34: The host computer may perform terminal authentication to compare S1h and S1t. When the terminal is authenticated, the host computer creates a third signature value S2h = Sig (H + R 3 + Time, Ks) and sends the third signature value to the terminal along with the time. The terminal creates a fourth signature value S2t = Sig (H + R3 + Time, Ks) and performs authentication of the host computer after comparing S2h and S2t.

Step 36: After authentication of the host computer, the terminal encrypts the information file (Info), including usage data (Log), differentiated billing mode table (ModeTB), timer (Timer), balances (Balance) and identification number (ID).

The terminal encrypts Info using M = Encrypt (Info, Ks) and sends the encrypted M value to the host computer. Then it is Info = Log + ModeTB + Balance + ID. After decrypting the encrypted value M as Info '= Decrypt (M, Ks) and comparing the ID' s ID with the ID, the host computer performs new terminal authentication. When the terminal is authenticated, usage for days, weeks, or months, and device timer information is stored in a log file and checked.

The encryption algorithm for transmitting and storing value used in the invention has been described above. The following issues need to be considered for an application for a real electricity meter.

The maximum number of storage meters that can be connected to a single-pole transformer is limited to 256. In a 3.3 kV to 220V supply transformer, one local service and observation unit (LS) controls 250 storage meters. These units with different serial numbers are connected to the other side of transformers with different poles. One area service and supervision unit (AS) connected to a maximum of 256 (LS) can control 65,536 value-added electricity meters. With a 256 LS control, one local serve in the tree structure can control up to 16 million AS. However, considering the performance and efficiency of the server, it is better to limit the maximum number of storage meters controlled by the local server. In case the signal passes through the pole transformer to the other side of 220V, the user of the general power line modem and the micrometer modem has a 3-byte ID. The Micom with Bus Encryption feature protects the encryption algorithm and encryption key, protects for convenient use, or can selectively use a secure access module (SAM), which is a subscriber identification module (SIM) type smart card. Electricity calculation, stamp stack and display can be controlled by another microcontroller. It is checked whether the liquid crystal display control and the power consumption calculation are blocked when the electricity meter communicates with the host computer. It is considered that there is a time limit to deliver time information to the meter. In particular, when it is assumed that sending time information to the family takes one second, the time information transmission to 3600 families takes one hour. The meter has a real-time clock and differentiated billing is used according to each time value. The time on the clock is corrected and monitored at every moment. Unauthorized power consumption is monitored, and in the event of unauthorized intrusion or disruption of the power line modem connection to a personal computer, a digital seal is used.

Digital sealing is done systematically by software and hardware means. A digital seal to monitor unauthorized power consumption is performed by the procedure whereby the terminal transmits energy consumption data at a certain point in time, day, week, or flight to the server as information of 2.44 kilobytes. The server records the information in the database, compares the recorded information with the information sent at the next time point, and compares the result with the total amount of electricity consumed in the same period. When a voltage is applied to the output terminal when the latch relay interrupts the power supply, this is defined as unauthorized power consumption. Therefore, emergency information is sent to the server.

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All power consumption information from the server can be used as a basis to compile a value on prices favorable to a new contract with a price rate by estimating electricity consumption for days, months or season based on the total amount of electricity consumed by hours, days, months or season .

When the interrupt circuit interrupts the power supply due to credit depletion, overcurrent interruption, interruption in a particular case, or unauthorized power consumption by interfering with the power supply at the front of the meter, unauthorized power consumption is detected by a voltage check procedure.

The credit value is transmitted and stored in an electricity meter, gas meter, water meter and calorimeter via a power line modem. The credit value for electricity is stored in the SVM and the remaining values are stored in the individual parts of the smart card electronic wallet.

With reference to Figures 5 to 7, the structure and function of an electricity meter constructed according to the above items will be described in more detail below.

Figure 5 shows an electricity meter that transmits and stores value information via a power line modem. In Fig. 5 there is a latching relay 1 of the type of interruption relay which switches off the power supply. Shunt 2 measures alternating current (AC) with a manganese resistance (Mn) of 0.1 mQ. When the latch relay 1 is in the open position, the power consumption sensor 3 registers a normal power consumption when the sensor is "0". Terminals 1s and 1L are blocked and electrical power is drawn in an unauthorized manner when the output on the sensor is "1". The buzzer 4 requires a new SVM credit mark after consuming the remainder of the mark changer 10, thereby guiding the consumer through the process of transmitting and storing the credit value for electricity. The credit and value-added smart card 5 records the smart card user's card number (CSN) in the control database according to the master key of the electricity retailer managing the credit value meter, checks the · BBBB BBBB

BBBBBBBBBBBBBBBB presence of registered legal CSN. This prevents unauthorized power consumption.

The voltage divider 6 adapts the AC voltage to the size of 117, 220 and 240 V to the input voltage range of the analog-to-digital voltage converter (abbreviation: V - ADC). The voltage range is selected by the ratio of two resistors connected in series. An analog-to-digital voltage converter (V-ADC) 7 is a circuit for converting an analogue AC signal into a 16-bit digital signal. An analog-to-digital current converter (abbreviation: I-ADC) 8 is a circuit for converting an analogue AC signal that flows through shunt 2 to a 16-bit or 20-bit digital signal. The power consumption operating circuit 9 calculates the power (in Watts) by multiplying the digital signal from the VADC 7 by the digital signal from the 1-ADC 8 and converts the result of the multiplication into a signal of frequency and pulse width. The power consumption operating circuit 9 compares the voltage phase to the current phase, calculates the angle by which the two phases differ, and outputs a phase difference signal, thereby making a difference to different billing items that are currently consuming inductive loads. The stamp changer 10 reduces the stamp status according to the amount (watt / hour) of electricity consumed per unit of time. After the stamp changer 10 is consumed, it will request new stamps from the stamp stack to ten units and reduce the status of the new stamps according to the amount of energy consumed. If the ten-stamp cartridge is used up, it will request a 100-unit SVM stamp, which will be discussed below, and the 10-stamp cartridge will be refilled. The grades required for SVM 166 can be obtained according to SAM 164. Using the RTC and the Energy Consumption Table 11, differentiated electricity billing is performed according to the power supply and the requirements at 50%, 75%, 100%, 150% and 200% by real time clock containing items: year (Y), month (M), day (D), hour (H), minute (M) and second (S) in the form (YYMMDDHHMMSS).

The smart card reader / writer 12 complies with ISO 7816 standard is a communication port consisting of eight terminals defined by standard 7816, parts

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2, comprising Vcc, Cik, DIO, Reset and Gnd for synchronous and asynchronous communication with the smart card. Multipurpose credit values for the measurement of electricity, gas, water, hot water, heat and pay TV are recorded on a single smart card by inserting a commonly issued smart card in an online or online meter. After recording the value sent from the gas supplier's service server via the electricity meter to transmit and store the value on the smart card, the smart card is removed and inserted into the gas meter into which the value information is transmitted, thereby reducing the value information on the card according to the amount of gas consumed. The meter for data transmission and storage can therefore be operated in off-line mode.

The modem for the power line 13 performs data communication over the power line. Each modem is set to one of the 256 PLMID Modem Addresses. The AC / DC power supply 14 delivers the operating voltage required by the stored value electricity meter of the invention. The triple byte ID, which is the internal number of the stored value electricity meter, is recorded to the ROM during the process. Non-volatile memory 15 in the form of a readily erasable memory records the power consumption situation in 24 hours can be found by recording electricity consumption by an electricity meter storing value as 16-bit information every sixty seconds, weekly electricity consumption data energy and monthly electricity consumption data by counting thirty total daily electricity consumption volumes, monitors unauthorized remote power consumption and performs an electronic seal. An encrypted bus 16 that includes a base processor (CPU) 162, a secure access module (SAM) 164 to retain the encryption key, and an encryption algorithm to store the credit value together with the value storage module (SVM) 166 to prevent the production and misuse of information about credit value, system disruption, and cryptographic attack. Liquid display

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The crystal 17 shows the remainder of the credit value, the value transfer status, the real-time power consumption situation, and the stored power consumption situation so that the user can visually differentiate it. The input and output terminal of the power line 18 consists of 1s, 2s, 2L and 1L to connect the input and output lines to each other and protect against physical disruption of the system. Lightning arrester 19 is a lightning or shock voltage absorption circuit.

An electrometer for measuring electrical energy of a certain type has been described above. However, after connecting the voltage divider 6, V-ADC 7, 1-ADC 8, latch relay 1 and shunt 2 according to the type of electric power, the meter according to the invention can measure at least two types of electric power. When the voltage divider, V-ADC 7, 1-ADC, latch relay and shunt are combined, so that at least two types of different voltage sources can be selectively or simultaneously used, individual current sizes can be measured and controlled.

The following is a description of the operation of the meter for storing value, which is compiled according to the above instructions. As already mentioned, the power supplier or power seller stores, by a credit value storing procedure, via a power line modem 13, the host computer's credit value to the SVM 166 of each terminal, each meter charging according to the amount of electricity consumed by the consumption operating circuit. The power meter 9 compares the calculated value with the credit value information stored in the SVM 166 and calculates the value using the mark converter 10. When the remainder in the SVM 166 does not exceed a certain value, the user is informed of the remainder by the buzzer sound. If the remainder is insufficient, the credit value is sent by the above procedure to store the value from the host computer to the SVM 166 or the power supply is interrupted by the latch relay 1. The credit value information may be stored in the SVM 166 according to the communication between the host computer and the stored value meter terminal of the invention. However, it is possible to send information about the value of the electric power stored on the chip card 5 to the following information: ······················· ··················· save the information sent to the SVM so that the chip card of the electricity, gas, water or calorimeter of the family or business in which it is located the legally recorded monetary amount is entered into the stored value electricity meter according to the invention.

The meter of the invention thus displays information e.g. about monthly consumption and the remainder of the card on the liquid-crystal display 17 installed using a certain amount of power within the range recorded in the SVM, and when the remainder of the card has a value not exceeding a certain value, the buzzer 4 is turned on. The credit value is automatically transferred from the account according to a previous agreement with the bank or the payment is made by credit card. The value of electrical energy is received online via the power line and stored in SVM 166. The value is reduced by the amount of energy consumed.

The electricity supplier and retailer can therefore save on costs by eliminating the need to read meters, input and calculate consumed quantities, and print and send bills. The electricity bill is paid in advance. It is also possible to reduce the account by interest on prepayment or to use different billing according to the length of electricity consumption or costs saved according to the difference between the purchase price and the sale price of electricity. The electricity retailer can thus create high added value.

To prevent the use of cards other than smart cards legally issued by an electricity supplier or power dealer, it is inserted into a SAM 164 meter that performs card authentication. When the card is inserted into the terminal, the terminal and the card authenticate each other. When the monetary information on the card is transmitted by the terminal as a credit value, the terminal operates according to the encryption procedure shown in Figure 1. This may prevent the use of a fake card. A procedure in which the encryption key becomes valid after the meter has been expanded, thus putting the terminal out of service, can be considered as protection against cryptographic interference against the system, e.g. when attempting to disassemble an energy-saving meter for artificial production

· · • · ···· • • · • • · · • · · · • • · • • • • • · • • • · • • • · · «· • · ·· • • · • • ···· • · · • • · · ·

terminal or card. However, the encryption algorithm and the encryption key in the terminal only have a quantity reduction key in which the credit value information is reduced according to the amount of energy consumed. It is therefore not possible to increase the amount of money or credit value information. In the present invention, in particular, when a user or a customer connects to an ARS server with a credit value transfer request by telephone or via a digital intercom device, the amount used is selectively offset using a credit card or bank account. The value transfer process begins with the extent to which payment is guaranteed. The process can also be performed via the Internet. In particular, a value may be transferred automatically when the value is stored under an automatic account transfer agreement between the electricity supplier or its seller and a financial institution limited to a certain amount. It is also suitable for those who have no experience with computers or information communication networks. Especially in the case of a payment order by e-commerce with a SET card for direct payment, the server as a cyber partner can enter the trade data into a digital envelope (DE), thereby signing the trade data. The trading process cannot therefore be rejected or falsified.

Hereinafter, an embodiment of the entire process and conditions satisfying the above invention will be described in more detail.

1) Procedures for creating, transferring and storing credit value

The credit value information is generated based on communication and operation of the customer's control database using the master key (Mk) of the seller or supplier of electricity. The customer ID number required by the LAN modem is dialed through the regional service and supervisory unit (AS) and the local service and supervisory unit (LS). When both the Subscriber ID number and the communication are complete, the legality of the server and terminal is verified by the above authentication procedure. After the authentication is performed, the requested credit value information is executed. Credit Information «· ···· · ·· ·· ·· · · · · ··· · · · · · · · · · · · · · · · · · · · · · The value sent through the power line is stored in the value storage module (SVM).

2) The procedure of transfer and storage of added value

The efficiency of the invention can be enhanced by adding an added value conversion function that the smart card can use for electricity meters, gas meters, water meters, calorimeters and hot water meters operating offline without a separate communication line. The creation and conversion of added value is accomplished by the above-mentioned procedures for generating and converting value. The added value is not stored in the electricity meter but on the chip card. The value added information for gas, water, hot water and thermal energy stored on the smart card can be operated and inserted into the meters and gas meters by an offline smart card compatible smart card as described in the Korean patent applications no. 98-6947 and 98-6948 filed by the same applicant. Thus, steering efficiency is maximized.

3) Credit Value Consumption Information

The status of the credit value information stored in SVM 166 is reduced in the mark changer 10 according to the amount of energy consumed. Grades are reduced by several milliwatts, a few watts or kilowatts per unit of time. When the minimum grade for the grade is exhausted, the credit value information will decrease as a result of requesting a new grade.

4) Using a differentiated rate for energy consumption

Electricity consumption mode, where several electricity consumption rates may be differentially applied according to time zones, days of the week, weekends, seasons and months for which the credit value is selected by the program and automatically applied. In the energy consumption mode table 1J. different rates can be chosen according to time zones and characteristics of supply and demand for electricity, electricity supply and its use. Real-time clock e.g. benefit from 100% on weekdays during the day, 75% off before and after normal working hours, 50% off at night, 200% increase during ·· ·········· · · · · · · · · · · · · · 9 · · · · · · · · · · · · · on weekdays and an increase of 300% between 2pm and 4pm during the summer period when air conditioning is most commonly used. Because a separate W-type changer is used for the same amount of electricity consumed, the stored credit value is applied differentially. Thus, electricity consumption is optimized in each time zone. This maximizes the efficiency of supply and demand for electricity. The electricity bill will therefore be lower.

5) Balance check and automatic interruption

The credit value information in SVM 166 is shown on the display, e.g. on the liquid crystal display so that the user can check the balance at any time. When the credit value is exhausted, the stamp changer informs the user that the last stamp is consumed by triggering an audible frequency alarm. If the credit value is not reached before the last mark is consumed, an interrupt signal is sent to the latch relay connected in series with the power line and the power supply is interrupted.

The above implementation procedure and conditions of the invention also satisfy the invention in conjunction with various gas and water meters, as long as it is possible to transfer added value by a smart card using a value-converting electrometer and storing a value that does not need to read the meter value. It will then have the following structure and adhere to these principles.

The storage meter of the present invention measures the voltage (V) and current (A) in real time, uses the electrical power consumption amount of electrical power (W), measures the power consumption per unit of time, converts the stored value information into stamps, the mark status according to the amount of electricity consumed per unit of time in the mark changer 10 and requesting new credit value information when the mark status is exhausted. Also, all information that the user should know, such as the amount of credit value information remaining and the state of power consumption, · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · the user is informed about it by the audible frequency alarm sound. The credit value is then recharged. When the internal credit value information is exhausted, the power supply is switched off by interrupting the latch relay 1.

In the Energy Consumption Mode (MT) table 11, which allows a differentiated rate of electricity consumption to be used in at least five stages, the real-time clock (RTC) applies a differentiated rate for electricity in different stages, e.g. 50%, 75%, 100%, 200%, and 300% by time zone, and lower the credit value. Thus, even if the same electricity is consumed per unit of time, the SVM credit value decreases differently because the stamp changer 10 uses different degrees of electricity tariff according to the time schedule defined by the rate scheme table. The power consumption is thus optimized in each time zone. The supply and demand for electricity are thus well balanced. Different levels of electricity billing offer the possibility to draw discounts at the discretion of the consumer. E.g. a discount in night hours where the supply of electricity is excessive, can provide a reduced rate of energy supply. When air conditioning is used intensively in offices in the summer, a higher rate is charged and the thermal energy storage system is started. Therefore, it is possible to offer a discount to electricity consumers in both households and businesses.

The value storage meter of the present invention has an encrypted data bus whose processor 162 or internal memory cannot be read by an unauthorized person, thereby preventing the artificial value and cryptographic corruption of the stored value. The storage meter consists of a secure access module (SAM) 164 into which a secret internal key (KT [nj) and encryption algorithm can be loaded, and a storage module (SVM) 166. If an intruder of a system or encryption attempts to disassemble the meter and artificially compile credit value information, not see encrypted key or encrypted ·· ·······················································

JA algorithm SAM and SVM. The SAM, SVM, and host key (Mk) elements perform mutual authentication. Thus, SAM and SVM can convert and store credit value information using the master key described above. When a smart card is inserted in the meter, after the card reset signal is sent, the reset response signal (ATR) is received, the smart card and the terminal perform mutual authentication, the credit value information is exchanged between SVM and SAM, and the credit value information is retrieved for legal use of smart card. The credit value information is recorded by a separately encrypted card issuer master key (Mk). Therefore, it is not possible to increase the credit value. These procedures are carried out in accordance with International Standards (ISO) 7816 Part 1, Part 2, Part 3, Part 4, Part 8 and Part 10 and relate to the physical standard, electrical signal, communication protocol and encryption procedure. At least two encrypted keys are stored as required by the control system. One encrypted key is updated after a certain amount of time. The encrypted key is used selectively.

This prevents unauthorized use of the credit value.

The transfer of credit value and value added and the monitoring of the legal use of value are carried out via a power line modem. A power consumption sensor circuit is used, wherein the power consumption information is recorded in a non-volatile memory 15 to monitor unauthorized power consumption and prevent unauthorized power consumption. It is not necessary to visit the place where the electricity meter is installed nor to check the integrity of the seal. This can be periodically monitored by LS or AS, thereby performing an electronic seal without the need to physically inspect the lead memory.

The storage meter has a serial number (SVPMSN) of three bytes in length. The modem for the power line 13 communicates with the LS using the address of the modem identification number (M-ID) 1/256. When a power seller or utility server registers a value-conversion request, it initiates a value transfer request to initiate a value transfer. Zaháj zaháj zaháj zaháj zaháj zaháj zaháj zaháj zaháj zaháj zaháj zaháj zaháj zaháj zaháj zaháj zaháj ··· ··· ··· · ············ · · Short-range communication with the electricity meter, storing the customer's value according to the addressing procedure to select the M-1 D customer.

The customer will request a credit value transfer by contacting the ARS of the power seller or power supplier by phone or digital intercom device 20 and keyboard 21 to collect credit card or bank account and choose to pay the electricity credit value. Then, the credit value management server is asked to transfer the credit value from the account number entered by the credit card company. The electricity seller's credit value management server invokes the M-ID via AS and LS, converts the credit value to the stored value electricity meter, and stores the converted credit value by performing the above storage procedures.

LS selectively monitors the power consumption status of up to 256 stored power consumers via a power line modem connected to a 117V / 220V power line over a maximum distance of 3 km. LS gradually calls value-saving meters with address 1/256 ..... n / 256, checks and sorts the change status of the meter's real-time clock, controls the rate system mode, checks CSN cards, backs up the credit value balance, checks for unauthorized and atypical electricity consumption and keeps records of electricity consumption over days, weeks or months, thereby summarizing and estimating the electricity demand. The results of the summary and estimation are used as a guide to the agreement on the purchase price of electricity and to reset the prices of the electricity supplied.

Off-line meter working with a smart card without a separate communication line is used when converting and storing value from gas meters, water meters and heat and hot water meters other than electricity meters, as these environments place greater demands on the installation and construction of the line is then very complex. When the value added information is transferred via the stored value meter to the smart card and the smart card is ·············· · ··· ··· ·· ···· ·· ········· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · By the same value-reduction procedures, the status of the marks is reduced. When the credit value information is exhausted, the gas, water, heat or hot water shut-off valve closes. The efficiency of the invention with the added value transfer is higher when the conversion can be used.

value and store the meter value together with the value added service. The creation and transfer of added value is carried out by the above procedures for generating and transferring credit value. The added value is not stored in the electricity meter but on the chip card. Value added information for gas, water, hot water and thermal energy is stored on the smart card as described above and can be transferred to a water meter and gas meter by an off-line smart card that accepts the smart card and is described in Korean patent applications of the Republic no. 98-6947 and 98-6948.

Next, the credit value conversion request will be described with reference to Figure 6 and the associated procedures in the power line modem.

Subscriber chip card 52 is issued to the requesting party according to the main key of the smart card 51 of the electricity supply system manager 50. After settling the credit value for electricity, gas, water, hot water and heat energy in cash or on site, the credit card is the first credit value stored on the smart card. The credit value for electricity on the card will be stored in the electricity meter after inserting the smart card into the electricity meter with storage? user values 55. When a smart card is inserted in a gas meter, water meter, hot water meter or heat energy meter 55, a credit value is stored on each meter *. After the first credit value has been stored, the procedure for converting the value by using a power line modem is to store another credit or added value. Conversion and storage of the value can be done by telephone, the Internet, the P-ATM terminal (EMV'96) and within the stored value electricity meter. Conversion and storage of the value is performed using the above encryption algorithm. Channel on ·········································································· · The transfer of credit value and value added is described as follows. The customer record information is downloaded from the customer database on the power supply host server 50. Payment to bank or VAN is guaranteed - the user chooses to pay by credit card number, direct payment by card number, or payment by bank account number. The credit value information is encrypted by the SAM master key. The customer ID of the meter with the stored charge is retrieved via the AS and LS networks. The SAM and master key perform mutual authentication. The credit value or value added information is then transferred. The Local Supervision Unit (LS) will record the electricity consumption for hours, days, weeks, or months from the stored value meter, monitor the power consumption status and daily or monthly credit value balance, perform a new time setting, set mode and program and monitors unauthorized and atypical electricity consumption. According to a procedure similar to the previous processes, a monetary amount is also counted between the monetary amount calculation system 54 of the electricity seller 53 and the electricity supplier 50.

Figure 7 is an enlarged perspective view of the external shape of the stored value electric meter of the invention. The storage meter of the present invention has a liquid crystal display 17 at the top and an input and output terminal 66 at the bottom and an input and output terminal 66 coupled to a power line for input and output of electricity and protected by a cover against unauthorized use. At the top of the tamper-proof housing 64 is a digital intercom communication device 20 for entering value conversion. On one side of the meter there is also a slot for inserting a smart card 60 into which the smart card is inserted. The smart card stores a credit value that is read from the smart card when the card is inserted into the smart card insertion slot 60. The meter also includes a check seal against unauthorized collection and disassembly 62 to secure the meter from misuse.

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As described above, the invention has been described above only with respect to a stored value electricity meter operating via a power line modem. Via a modem for power lines, the server with the terminal can exchange the necessary information with each other. Instead of a power line, a telephone line, a high-frequency communication line relay for cable television can be used.

As mentioned above, according to the invention, personnel costs can be reduced because there is no need to read meters of electricity, gas, water and electricity and to calculate operating costs, print and send bills, which also eliminates postage costs.

It is also possible to reduce losses resulting from unpaid bills and arrears for electricity, and it is possible to create added value because the credit value is paid by credit card or from a bank account in advance. The electricity supplier can thus create a high added value.

Industrial usability

The invention discloses a combined electricity meter that can solve the economic and safety problems associated with visiting installation sites and visual inspection of conventional electricity meters at a remote location.

Claims (4)

PATENT CLAIMS A method for storing credit information in a value storing module in a stored value meter according to communication by the host computer and each terminal via a power line modem that is in the value storing meter and is a terminal comprising the steps of: a) generating the first random data by the host computer, sending the first random data to the terminal, creating the session key by the key generation algorithm using the internal secret key of the terminal, creating the first signature value by the signature generation algorithm for comparison during terminal authentication; session key in the same way as the host computer b) generating a second signature value by an algorithm for generating the signature and second random data and sending the second random data to the host computer; c) comparing the first and second signature values and authenticating the terminal with the host computer, wherein the host computer generates a third signature value and sends the third signature value to the terminal with the monetary information, receiving the third signature value and the monetary information from the host creating a fourth signature value and authenticating the host computer to the host computer by comparing the third and fourth signature values to each other; and d) increasing the value of the terminal after decrypting the monetary information and sending the value obtained by encrypting the balance and the terminal ID using the encryption algorithm to the host computer, receiving the encrypted value by the host computer, decrypting the encrypted value , comparing the stored terminal ID with the decrypted terminal ID, re-authenticating the terminal and, after authentication, backing up the balance in the log file. The method of claim 1, further comprising an electricity billing conversion system comprising the sub-steps of: a) generating the first random data by the host computer, sending the first random data to the terminal, creating a session key by the key generation algorithm using a characteristic secret key of the terminal, creating the first signature value by the signature generation algorithm for comparison during terminal authentication; session key in the same way as the host computer b) generating a second signature value by an algorithm for generating the signature and second random data and sending the second random data to the host computer; c) comparing the first and second signature values and authenticating the terminal with the host computer, wherein the host computer generates a third signature value and sends a third signature value to the terminal with mode information, receiving the third signature value and mode information from the host terminal; of the fourth signature value and «··········································· 31 ·························· d) authenticating the host computer by the terminal by comparing the third and fourth signature values, wherein the terminal executes the rate system, generating an encrypted value obtained by encrypting the mode information and the terminal ID using an encryption algorithm and sending the encrypted value to the host and receiving the encrypted I values host computer,. decrypting the encrypted value, comparing the stored terminal ID with the decrypted terminal ID, re-authenticating the terminal and, after authentication, backing up the balance in the log file. The method of claim 2, further comprising a step of controlling the usage information comprising the sub-steps. a) generating the first random data by the host computer, sending the first random data to the terminal, creating a session key by the key generation algorithm using a characteristic secret key of the terminal, creating the first signature value by the signature generation algorithm for comparison during terminal authentication; session key in the same way as the host computer b) generating a second signature value by an algorithm for generating the signature and second random data and sending the second random data to the host computer; c) comparing the first and second signature values and authenticating the terminal with the host computer, the host computer generating a third signature value and sending the third signature value to the terminal with time information, receiving the third signature value and mode information from the host 9 9 9 · 9 9 9 9 9 9 9 9 9 9 · termin termin termin 9 9 9 9 9 9 9 termin termin termin termin termin termin termin termin termin termin termin , creating a fourth signature value and d) authenticating the host computer by comparing the third and fourth signature values, sending the value obtained by encrypting the usage data file using the encryption algorithm and sending the encrypted value to the host computer and receiving the encrypted value by the host computer, decrypting the encrypted value; terminal authentication and, after authentication, backing up usage information for days, weeks, and months of the timer in the log file. 4. A stored value electric meter comprising an input and output terminal of a power line for measuring the amount of electricity consumed, comprising: an operating part of the electricity consumption for measuring voltage and current on the power line and calculating the electricity consumed; a power line modem for data communication between the host computer and the terminal over the power line; a security part comprising a base processor (SAM) secure access module (SAM) and a cryptographic key and a value storage encryption algorithm and a value storage module (SVM) to prevent value information from being exploited and exploited by an intruder except when cryptographic SVM mark requests required SAM authentication process; latching relay for power supply interruption according to SVM balances ·· ···· 9 and · · · · · · · · · · · · · · · · · · · · · · · · · · · · reducing the mark by inputting value information from the SVM according to the amount of electricity consumed per unit of time, with a new mark when the stack is depleted. 5. The storage meter of claim 4, further comprising a chip card reading and recording portion for use in other meters such as water meters, gas meters and calorimeters, by inserting the card into the meter, receiving the value from the host computer. in the online mode, by recording the received value on the inserted smart card and reading the received value from the smart card. 6. The storage meter according to claim 5, wherein the chip card reading and recording portion is preferably used for off-line meters, gas meters and heat meters operating on the chip card by passing the chip card over the chip card. modem records added value eg. For gas and water, the card can store electrical power according to a communication port that contains eight terminals defined by ISO 7816, Part 2, with Vcc, Clk, DIO, Reset and Gnd functions for synchronous and asynchronous communication with the smart card. 7. The storage meter of claim 4, further comprising: AC / DC converter for supplying the operating voltage required for the meter, energy consumption sensor indicating normal power usage when the sensor input is 0, and when the sensor is 1, the terminals are blocked and power is taken illegally and a buzzer to generate an audible alarm prompting the user to send an alarm to the user. ··· ·· ···· ·· ······································································································································· 8. The storage meter according to claim 4, wherein the operating portion of the power consumption system preferably includes an AC shunt, a voltage divider of the series connection of two resistors, and a voltage range selected from the ratio of the two resistors to match the AC voltage of the power line. within a voltmeter input voltage range, an analog-to-AC converter that flows through the 16- or 20-bit digital signal and an analog-to-digital converter to convert the AC to 16-bit digital signal, comparing the voltage phase to the current phase; and it calculates the angle by which the two phases are offset from each other and the output as a signal for applying differentiated rates. The storage meter of claim 4, further comprising a power consumption table in the form of a multi-stage differentiated power rate table of 50%, 75%, 100%, 150% and 200%, respectively, and real-time clock demand, which includes year, month, time, minutes, and seconds. 10. The storage meter of claim 4, comprising a nonvolatile memory in which characteristic 3 bytes of the ID number are stored and the recorded state of electricity over a certain number of hours, days, or months to remotely monitor unauthorized or atypical offtake. electric power ·· ·· ·· ·· · ···· · · · · · · · · · · 9 ············· 99 ················· The storage meter of claim 4, comprising a liquid crystal display to visually display the current value, the value conversion, the real-time power consumption status, and the conditions in which the accumulated power is used. The storage meter according to claim 4, wherein the storage meter that can be used for a simple and reliable payment of fees for electronic business transactions (SET) using the next generation of EMV'96 credit and direct payment cards in combination with The chip card reader and recorder further comprises: devices such as a telephone, the Internet, a P-ATM terminal (EMV'96), and a digital intercom device for audio communication with the person serving the host server, or sending an audio message to assist the user e.g. with data entry, and a keyboard for the user who wants to save the value directly. 13. The storage meter of claim 4, wherein the input and output terminals of the electricity meter of the meter, comprising a housing and a physical seal against violent intrusion, prevent unauthorized and atypical electricity consumption. The storage meter of claim 4, further comprising lightning arresters for absorbing lightning or shock voltage on the power line of the supplier. 15. The storage meter according to claim 4, wherein the value meter of claim 4 is characterized in that: The power line of the transformer to reduce 3.3 kV to the generally used voltage further includes a current transformer to measure the total amount of current, the meter being in a network connected to local service and supervisory units (LS) with modems for communication with a maximum quantity of 256 electricity meters storing value on the power line and with regional service and supervision units (AS) to control a maximum quantity of 256 LS. 16. The storage meter according to claim 15, wherein: of: the host computer further comprises a server for the seller and supplier of power to issue the smart card to the customer, the smart card containing the master key performing automatic value transfer when the user requests value storage, monitoring and controlling the legal use of value by the customer, the power of the customer, thereby setting a new price when purchasing electricity, each server connected to different AS manages and monitors the electricity and storage meter that can be connected to AS and LS in a tree structure, and stores the electricity and storage meter value 17. The storage meter of claim 15, further comprising a voltage divider, an analog-to-digital voltage converter, an analog-to-digital current converter, a latch relay, and a shunt so that at least two types of power sources use the voltage in a selective manner; use at least two types of voltages simultaneously, individual current sizes can be measured and controlled separately. 3T- · · ···· • · · · ·· · • · • • • • · • • • 4 • • · • • • · • • ··· · • · · • · · • • ···· • · · • · · 13741 - reference numbers latch relay 1 shunt 2 buzzer 4 chip and credit card 5 voltage divider 6 analog-to-digital voltage converter (V - ADC) 7 analog-to-digital current converter (abbreviation: I - ADC) 8 power supply circuit power switch 9 mark changer 10 power consumption table (MT) 11. chip card reader / writer 12 power line modem 13 ac / dc power 14 non volatile memory 15 encrypted bus 16 liquid crystal display 17 power line input and output terminal 18 blueprint 19 digital intercom device 20 keypad 21 to enter value transfer power supplier power 50 smart card master 51 customer smart card 52 power seller 53 money calculation system 54 electricity meter storing user value 55 smart card insertion hole 60 tamper proof and disassembly 62 tamper proof cover 64 input and output terminal 66 basic processor (CPU) 162 secure access module (SAM) 164 value storage module (SVM) 166