KR0157941B1 - Pre-payment electronic watt hour meter - Google Patents

Abstract

The present invention relates to a prepayment electronic watt-hour meter, and in the related art, the electricity supplier first supplies electric energy, and the user adopts a method of postpaying electric bills by a certain billing cycle unit after using the electric energy. In this case, if the electricity user moves while in use, it is difficult to settle the balance, and the exchange loss occurs due to fluctuations in the exchange rate or inflation that occurs during the period due to the difference between the time of supplying electricity and the time of payment. There is a problem that occurs when the supplier or the user sees the damage. Therefore, the present invention pays an electric bill to an electricity supplier before using the electric energy, uses the electric energy as much as the paid electric charge, and when the electric energy is exceeded by the paid electric charge, the power source. By shutting off the supply, the problem caused by the exchange loss due to the date difference between the time of supplying electric energy and the time of payment of the user's fee is dismissed, and the difficulties caused by cost settlement are solved.

Description

Prepayment Electronic Wattmeter

1 is a block diagram of a conventional electronic electricity meter.

2 is a block diagram of a prepayment electronic wattmeter of the present invention.

3 is a detailed configuration of the rate setting and the amount input unit in FIG.

4 is a flowchart illustrating an operation of a method for controlling prepayment electronic power according to the present invention.

5 is a table applying the base rate and power rate step by step.

6 is a diagram showing a bar code, a password, information registered on a card, a display method, and display contents in FIG.

* Explanation of symbols for main parts of the drawings

1: power transformer 2: power circuit

3: power failure compensation unit 4: instrument transformer

5: current transformer 6: multiplier

7: frequency converter 8: divider

9: indicator 11: charge setting and input amount

12 comparison unit 13 load control unit

14: alarm signal output unit 100: power supply unit

200: input converter 300: power / frequency converter

400: Price settlement and display

The present invention relates to a prepayment meter that uses power in advance and uses energy. Particularly, the present invention relates to a problem caused by a cost difference due to exchange rate fluctuations and inflation due to a difference between an electric energy supply time and a user's payment time. It is about a prepayment electronic wattmeter to solve.

Conventional electronic wattmeter configuration, as shown in Figure 1, the power supply means for supplying power to each circuit portion required in the electronic wattmeter, and an input for reducing the high voltage, high current supplied from the power supply to a predetermined low voltage, low current A power / frequency converting means for multiplying a current and a voltage transferred through the input converting means, obtaining power and converting the power into a frequency proportional to the power; and a frequency transmitted through the power / frequency converting means. It is composed of electric power measuring means for measuring the amount of power used by dividing by multiplying by proper time period and displaying.

The input conversion means is composed of an instrument transformer for reducing the high voltage input by connecting in parallel with the power supply side to a predetermined low voltage, and a current transformer for reducing the high current input by connecting in series with the power supply side to a predetermined low current.

The power / frequency converting means includes a multiplier for calculating power by multiplying an input voltage and a current, and a frequency converter for converting and outputting a frequency proportional to the power output from the multiplier.

In addition, the electric power measuring means is composed of a display device which allows the user to measure the amount of power used by dividing the input frequency into an appropriate time period and integrating and outputting the integrated frequency output from the divider. .

Referring to the prior art configured in this way in detail as follows.

A wattmeter is a device that measures and measures how much electrical energy supplied from a power supply company is used on the load side. The development of electric wattmeter is inevitably the emergence of an electronic wattmeter due to the demand for versatility, light weight and high density in a mechanical wattmeter. It became.

For the electronic wattmeter, conventionally, first, the power transformer 1 of the power supply unit 10 receives AC power from the power supply side that provides the electric energy supplied from the electricity supply company, When the voltage drop is applied to the power supply circuit section 2 at a predetermined voltage enough to rectify, the power supply circuit section 2 rectifies the voltage and supplies DC power to each circuit section.

At this time, the power failure compensator 3 compensates the power failure by using the battery to maintain the weighing data and various setting parameters stored in the volatile memory at the time of power failure.

The instrument transformer 4 of the input converter 20 converts the high voltage supplied from the power supply into a predetermined low voltage, and the current transformer 5 converts the low current into a low current with respect to the high current supplied from the power supply. Output to the converter 30.

The multiplier 6 of the power / frequency converting unit 30 receives the voltage from the instrument transformer 4 and the current from the current transformer 5 and performs pulse width modulation corresponding to the power obtained by multiplying the multipliers. When delivered to the frequency converter 7, the frequency converter 7 converts the pulse width modulated signal into frequency and outputs it to the power amount measurement unit 40.

When the frequency divider 8 of the electric power measuring unit 40 divides the input frequency signal at a predetermined time interval and integrates the integrated frequency signal, and provides it to the indicator 9, the indicator 9 can display and recognize the integrated electric power amount. To make sure.

Conventionally, the electricity supplier supplies the electric energy first, and the user adopts the method of postpaying the electric bill by a certain rate calculation cycle after using the electric energy. In this case, it is difficult to settle the balance cost, and exchange loss occurs due to fluctuations in the exchange rate or inflation that occurs during the period due to the difference between the time of supply of electricity and the time of payment of the fee. There is a problem that occurs.

Accordingly, an object of the present invention for solving the conventional problems is to pay the electric bill to the electricity supplier before using the electric energy, to use the electric energy as much as the paid electric bill, as much as the paid electric bill Prepayment electronic watt-hour meter that cuts off the power supply when the electric energy is exceeded, eliminates the problems caused by the exchange loss due to the difference in the date between the time of supplying the electric energy and the user's payment time, and solves the difficulties caused by cost settlement. In providing.

The wattmeter of the present invention for achieving the above object, as shown in Figure 2, the power supply means for supplying power to each circuit portion required in the electronic wattmeter, and the high voltage and high current supplied from the power supply side to a predetermined low voltage, Input conversion means for reducing the current to low current, power / frequency conversion means for multiplying the current and voltage transmitted through the input conversion means to obtain power and converting the frequency into a frequency proportional to the power; and the power / frequency conversion means. By comparing the frequency delivered through the appropriate time period with the amount of power dispensed and accumulated and the preset data, the charge data corresponding to the amount of power used is displayed, and if the remaining cost is below a certain value, an alarm is issued. The power supply side is controlled by the charge settlement and display means for blocking and the control from the charge settlement and display means. It constitutes the supply line to be supplied to the load side from the block, or short-circuit the supply / cut-off switch to.

As shown in FIG. 3, the rate settlement and display means divides the frequency into the input frequency at an appropriate time period and integrates the frequency divider to calculate the amount of power to be used, and sets a base rate and an electricity rate of electric energy. In addition, the billing setting and the amount input unit for inputting the pre-paid amount, and the data corresponding to the amount of power used in the frequency divider is calculated as the electricity use rate and the calculated amount and inputted in the rate setting and the amount input unit A comparison unit for controlling the operation of each unit by comparing the amount information, a load control unit for controlling the power supply to the load side according to the comparison result of the comparison unit, and an alarm when the remaining amount is below a certain level as a result of the comparison through the comparison unit Alarm signal output unit for generating a and power consumption and amount information according to the output of the comparison unit It consists of an indicator that displays.

When described in detail with respect to the operation and effect of the present invention configured as described above.

Predetermined voltage such that the power transformer 100a of the power supply unit 100 receives AC power from the power supply side that provides the electric energy supplied from the electricity supplier and can be rectified in the power circuit unit 100b. When the voltage drop is applied to the power supply circuit unit 100b, the voltage is rectified by the power supply circuit unit 100b to supply DC power to each circuit unit.

At this time, the power failure compensator 100c compensates for the power failure by using the battery to maintain the weighing data and various setting parameters stored in the volatile memory during the power failure.

The instrument transformer 200a of the input converter 200 converts the high voltage supplied from the power supply to a predetermined low voltage, and the current transformer 200b converts the high current supplied from the power supply into a low current to power / frequency. Output to the conversion unit 300.

The multiplier 300a of the power / frequency converting unit 300 receives the voltage from the instrument transformer 200a and the current from the current transformer 200b and modulates the pulse width corresponding to the power obtained by multiplying the multiplier 300a. When delivered to the frequency converter 300b, the frequency converter 300b converts the pulse width modulated signal into a frequency and outputs the fee to the display 400.

Then, the frequency divider 400e of the rate settlement and display unit 400 divides the frequency signal output from the frequency converter 300b at regular time intervals, and integrates the calculated frequency and outputs the calculated amount of power to the comparison unit 400b. .

The important point here is to determine how much to design and develop a frequency signal proportional to the power used in the load output from the frequency converter 300b. For example, the maximum N (Pulse / sec) is determined. If the wire, voltage and current are

The power at maximum load can be obtained by the following formula.

When converting power into frequency components when using this maximum load

When the result obtained in Eq. (3) is obtained as (kWh / Pulse), Equation (4) is obtained.

The above calculation result (4) means that the amount of power used is 0.00275 / N (kWh) when the number of pulses output from the frequency converter 300b is input.

At this time, the charge setting and the amount input unit 400a performs a function of setting a base charge and an amount of electricity charges related to the use of electric energy and a function of inputting a prepaid amount of electricity that can be used for electricity. Let's look at the ability to set the fee.

In the case of using general residential power, the electric charge is calculated by adding the electric charge to the basic charge. The basic charge is a cost equivalent to the fixed cost required for the facilities required for the electric company to generate and transmit electricity. As shown in (a) of FIG. 5, it can be set in 6 steps so that it is set by the electricity supplier.

In addition, in the present invention, in order to apply the electric charge differential between the small power user and the large power user, in the present invention, as shown in (b) of FIG. do.

For reference, according to the current domestic electricity rate and supply regulations, the basic rate is calculated as in (c) of FIG. 5 and the amount of electricity is calculated as in (d) of FIG.

For example, if one household uses 151 kWh of electricity per month, the electricity bill is as follows.

Therefore, when calculating with reference to the basic rate table shown in (c) of FIG. 5, since 151 kWh was used, it falls in the range of 101-200 kWh and the rate is 740 won.

Then, the electricity rate can be obtained by referring to the electricity rate shown in (d) of FIG.

Therefore, the electricity bill is 11454.9 won, which is the base rate of 740 won and the electricity rate of 10713.9 won.

Next, the function of inputting a prepaid amount of electricity that can be used for electricity can be performed by using a barcode, a password, a card (IC card or magnetic card), and a bill reader according to a user's request. Make it manufacture and sell.

First, in the case of using a barcode, a small barcode scanner is installed in the meter, and the electric user pays the electricity supplier and reads the barcode sticker information purchased by the scanner to register the prepaid amount in the meter.

As a result, when the meter outputs the basic rate table information, the power rate list information, the current year / month information, and the prepaid amount information of FIG. 5 (a), the meter is inputted from the barcode input unit a21 of FIG. Outputs the barcode input unit a21 to the memory a4, and stores the current input amount and the remaining amount using the stored information. do.

In the above, the current year / month information is used to designate an expiration date for use of the bar code sticker, and the information contained in the bar code sticker includes basic fee information, power amount fee information, and current year / month as in (a) of FIG. Information, prepaid money, etc.

Secondly, if a password is used, a keyboard is provided in the meter so that the electrician pays a certain amount to the electricity supplier and registers the prepaid amount by inputting the secret password to the meter.

At this time, the information contained in the password is composed of alphanumeric (ALPANUMERIC) of 12 characters as shown in (b) of FIG. 6 to indicate the amount classification information, password, prepaid fee information, valid entry period.

When the prepaid amount registered in the meter is output, the password input unit a22 is input, and the input signal selection unit a3 selects the stored amount in the memory a4.

Third, when using a card, the meter is equipped with a card interface (a23), such as a card reader, so that the user pays a certain amount of money from a financial institution designated by the electricity supplier and other electricity suppliers. The IC card and magnetic card information is read into the meter interface to register the prepaid amount in the meter.

As a result, the meter outputs the basic fee information, power amount fee information and prepaid amount on the card as shown in (c) of FIG. 6, and the card interface a23 is inputted by the input signal selector a3. To be transferred to and stored in the memory a4.

Fourth, in case of using a bill reader, a person who wants to use electricity is provided with a bill reader in the meter so that an electric user such as a hotel or a condo can use it for only a few hours or days. When the input is recognized and output the amount of money, the bill recognition unit (a2) is input to the input signal selector (a3) to be stored in the memory (a4).

Accordingly, the comparison unit 400b of the rate settlement and display unit 400 of FIG. 2 calculates an amount of power corresponding to the amount of power input from the frequency divider 400e as a power usage fee, and sets and charges the amount of money. When the amount of power (V) used by comparing the amount information input from 400a) is more than the sum (W) of the prepaid rate (Y) and the remaining amount (T), a load blocking signal is sent to the load control unit 400c and the load The control unit 400c turns off the supply / interruption switch SW to cut off the power supplied from the power supply side to the load side to prevent the use of power.

In addition, when the remaining amount is below a certain level, the alarm signal is issued to the alarm signal output unit 400d to generate an alarm so that the user can be notified as an alarm sound that the remaining amount is a small amount.

That is, when the 1.15 x power consumption fee V is greater than the sum W of the prepaid fee Y and the remaining amount T, the alarm signal is transmitted to the alarm signal output unit 400d.

In this case, the reason why the power consumption rate is multiplied by 1.15 is to secure a free time before inputting the prepaid fee information into the meter when the power is used and the current remaining amount is a small amount.

In addition, the power consumption (kWh) and the amount of money information are displayed according to the result of comparison in the comparison unit 400b. Since the display contents cannot be displayed at a time, the identification code is displayed in front and displayed in the rear as shown in (d) of FIG. The contents are displayed in a circular manner at regular time intervals. '01' is a recognition code indicating total power consumption, and '58493.2 kWh' indicates total amount of required power to date.

Here, the recognition code to be used may be expressed as shown in (e) of FIG.

Referring again to the above-described process according to the flowchart shown in FIG. 4, when the program starts for the first time, after performing an initialization operation, a new month is set by the user or the electricity supplier. If not, the initial value is set to '1st every month' (S1). This is to determine the electricity bill payment cycle. Also, when it is set, the monthly power consumption is automatically reset to zero on the same date every month.

The reason why the 'new moon' is necessary is that the electricity value is accumulated and accumulated, so if the season does not change, since the base rate and the electricity rate are applied based on the accumulated amount of electricity so far, a high electricity rate is calculated. to be.

For example, if 3,5 months have passed since the installation of the meter,

First, if there is no seasonal change, the electricity bill is calculated as the base rate and electricity rate for the total power consumption of 483 kWh. Second, if there is a seasonal change, the electricity rate is the base rate and electricity rate for 108 kWh used after 3 months. Is calculated.

As described above, when the setting of the new moon is completed, the pulses input from the frequency converter 300b are accumulated and stored in the Z buffer, and the Y buffer is prepaid by the user as an electric charge to the electricity supplier. Input and store the amount (S2).

Afterwards, if the current date is equal to the set new month, it recognizes that the new season has started and resets the Z-buffer that accumulates the input pulses to zero to calculate the new moon's power. The amount of power (kWh) is calculated using the input pulse and stored in the X buffer (S3).

Then, the total amount of the prepaid amount (X ') and the remaining amount (Y') is stored in the W buffer, and then the amount of power used is compared to the amount of power stored in the X buffer and the first level of power (F). If larger, it is larger than the strategic amount range of the first-stage power amount, so branch and compare the used power amount stored in the X-buffer with the first-stage power amount (G). ).

In the above, the first-stage power amount F refers to the electric power range shown in No. 1 of the electric power rate list shown in FIG. 5B.

There are seven methods for calculating the power rate in step S4, which is as follows. Here, the base rate and the electricity rate refer to the chart shown in (a) and (b) of FIG.

(1) Calculation of electricity charges = No.1 base rate + (No.1 electricity rate charge * power consumption)

(2) Electricity charge calculation = No.1 base rate + {(No.1 electric charge rate * F) + [No.2 electric charge rate * (use electricity quantity -F)]}

(3) Electricity charge calculation = No.2 base charge + {(No.1 electric charge fare * F) + [No.2 electric charge fare * (GF)] + [No.3 electric charge fare + (power consumption -G)] }

(4) Electricity rate calculation = No.3 base rate + {(No.1 electric charge rate * F) + [No.2 electric charge rate * (GF))] + [No.3 electric charge rate * (HG)] + [ No.4 Electricity Charge * (Power Usage-H)]}

(5) Electric power rate calculation = No.4 base rate + {(No.1 electric power rate * F) + [No.2 electric power rate * (GF))] + [No.3 electric power rate * (HG)] + [ No.4 Electricity Charge * (IH)] + [No.5 Electricity Charge * (Power Usage-I)]}

(6) Electric power rate calculation = No.5 base rate + {(No.1 electric power rate * F) + [No.2 electric power rate * (GF))] + [No.3 electric power rate * (HG)] + [ No.4 Electricity Charge * (IH)] + [No.5 Electricity Charge * (JI)] + [No.6 Electricity Charge * (Used Power-J)]}

(7) Electricity rate calculation = No.6 base rate + {(No.1 electric charge rate * F) + [No.2 electric charge rate * (GF)) + [No.3 electric charge rate * (HG)] + [ No.4 Electricity Charge * (IH)] + [No.5 Electricity Charge * (JI)] + [No.6 Electricity Charge * (KJ)] + [No.7 Electricity Charge -K)}}

By comparing the used electric charge (V) and the total amount of money remaining (W) by the above method, if the used electric charge is greater than the remaining amount, a load cutoff signal is generated to the load control unit 400c to switch the supply / cutoff switch (SW). In order to stop the electricity supply, and if the remaining amount is large, when the supply / blocking switch SW is cut off, the blocking signal is released (S5).

After adding 15% (1.15 * V) to the U-buffer and saving the stored value in the U-buffer, the added value is 15% compared to the remaining total amount (W). If greater than the remaining amount is a small amount, the alarm signal output unit 400d in order to inform the user by the alarm sound, and after 5 minutes to check whether the alarm signal is released in 5 minutes, the total amount remaining (W If) is large, the use power charge (V) is performed (S6).

Then, the used accumulated power amount X and the remaining amount T are displayed on the display 400f (S7).

After that, it returns to the beginning again and repeats the above operation.

As described in detail above, in the present invention, a cost difference due to exchange rate fluctuations and inflation occurs due to a difference between an electric energy supply point and a user's rate payment point by prepaid electric power usage fee and using energy. The effect is to eliminate the damage to the user and to make it easier for the electricity supplier to settle the balance cost when the user moves in use.

Claims (8)

Power supply means for supplying power to each circuit portion required by the electronic watt-hour meter, input conversion means for reducing the high voltage and high current supplied from the power supply side to a predetermined low voltage and low current, and the current and voltage transmitted through the input conversion means. Multiplying the power / frequency conversion means for calculating the power and converting the power to a frequency proportional to the power, and comparing the amount of power that is divided and accumulated with the frequency transmitted through the power / frequency conversion means at an appropriate time period and the preset data. By displaying the charge data corresponding to the amount of power used, and alarming when the remaining cost is below a certain value, and by the settlement and display means for cutting off the power supply if there is no remaining cost, and by the control from the settlement and display means Supply / Block switch that cuts or shorts the supply line from the power supply to the load Pre-payment electronic watt-hour meter, characterized in that a generated. The method of claim 1, wherein the charge settlement and display means divides the input frequency into an appropriate time period and calculates the amount of power used by integration, and sets a basic fee and an electric charge for electric energy. Charge setting and amount input means for inputting an amount of money, data corresponding to the amount of power used in the frequency divider is calculated as an electricity use rate and the calculated amount is compared with the amount information input from the rate setting and amount input means A comparison means for controlling the operation of each unit, a load control means for controlling the power supply to the load side according to the comparison result of the comparison means, and an alarm when the remaining amount is less than a certain level as a result of the comparison through the comparison means. Alarm signal output means for generating a table, and information on the amount of power used and the amount of money according to the output of the comparison means To give consisting of indicators to pre-payment electronic watt-hour meter according to claim. The prepayment electronic watt-hour meter according to claim 2, wherein a bar code scanner is attached as a fee setting means and a money input means for inputting a prepaid money amount. 3. The prepayment electronic watt-hour meter according to claim 2, wherein a password is provided as a fee setting means for inputting a prepaid amount and an amount input means to input a password. 5. The prepayment electronic watt-hour meter according to claim 4, wherein the password comprises 12 characters of alpha numeric, wherein the price classification information, the password, the prepaid fee information, and the valid input period information are registered. 3. The prepayment electronic watt-hour meter according to claim 2, further comprising a card interface as a fee setting means for inputting a prepaid amount of money and a price input means for reading information of the card. The prepayment electronic watt-hour meter according to claim 2, wherein the bill is input as a bill setting unit for inputting the prepaid amount and a bill input unit to recognize the bill. The method of claim 2, wherein the fee setting and the amount input means includes a rate setting means for setting a basic rate and a power amount rate, a bar code input means for receiving a prepaid amount registered in a bar code, and a number when inputting a password. Password input means for receiving the registered prepaid amount, card interface for receiving the amount registered in the card, banknote recognition means for the user to recognize the input amount when inserting the bill, and through the means A prepayment electronic watt-hour meter, comprising: an input signal selection means for selecting a corresponding signal and storing it in a memory when a signal is input.