KR200221678Y1 - A wattmeter which has a indicating function of present gas rate - Google Patents

Abstract

The present invention relates to a power meter having a current charge display function, and outputs an effective pulse using a voltage value obtained by converting a current value measured by a current transformer and a voltage value measured by a transformer for an instrument and modulating a pulse width.

In the instrument transformer outputs a phase value at the voltage value via the abnormal part and the pulse width modulator,

Outputting an invalid pulse from the voltage value converted from the current value and the voltage value via the pulse width modulator;

By displaying the operation and status of the instrument, power amount, maximum demand power, current demand power, and current usage fee for the effective pulse, phase value, and invalid pulse, the user can easily and simply grasp the power supply status, It is possible to know whether or not the power is present to facilitate the power saving.

Description

A wattmeter which has a indicating function of present gas rate}

The present invention relates to a electricity meter having a current charge display function, which is installed in a general household consumer to measure the precision power, the total power for power factor measurement, the reactive power for power factor measurement, and the maximum demand power, and thus the total power used by a user or a meter reader. The present invention relates to a electricity meter having a current charge display function that allows users to be informed of monthly electricity use, monthly electricity charges, and current electricity use rates, thereby realizing power savings while arousing awareness of electricity use.

In general, it is well known that a watt-hour meter reads an effective amount of power for use in calculating a charge while accumulating and displaying a sum of power consumed within a certain time.

If a regular wattmeter is used to measure the effective power, a precision wattmeter is used to accurately measure the daily power consumption and the maximum demand power, and a time switch and a reactive power meter are additionally added to measure reactive power by power factor measurement. Had to be installed.

In addition, it is necessary to provide data in developing a power supply and demand plan by measuring the amount of power used at each time from the point of view of a customer or a power supplier.

Therefore, the present invention is used in combination with the current transformer for the instrument and proposes a multi-function instrument that displays the amount of power used in each time zone while simultaneously having the functions of a precision power meter, a full power meter for power factor measurement, a reactive power meter for power factor measurement, and a time switch. I use it.

However, according to the conventional multi-function instrument as described above, the total power consumption, monthly power usage, and monthly usage fee can be accurately displayed, while there is no function of displaying the current usage fee, which wastes unnecessary power. There were disadvantages such as being.

Accordingly, the present invention has been devised to solve the conventional problems as described above, and installed in a general household consumer to measure the amount of precision power and the maximum demand power, and to the user or the meter to use the total power, monthly power, and monthly fee. It is an object of the present invention to provide a power meter having a current charge display function that allows the user to inform the current usage fee and to realize power savings while arousing awareness of the use of electricity.

A wattmeter having a current charge display function of the present invention for achieving the above object outputs an effective pulse using a voltage value obtained by converting a current value measured by a current transformer and a voltage value measured by a transformer for an instrument and modulating a pulse width,

In the instrument transformer outputs a phase value at the voltage value via the abnormal part and the pulse width modulator,

Outputting an invalid pulse from the voltage value converted from the current value and the voltage value via the pulse width modulator;

For the effective pulse, phase value and reactive pulse, the operation and status of the instrument, precision power, precision power for power factor measurement, reactive power for power factor measurement, maximum demand power, current demand power, current time, etc.

By displaying precision power, current demand power, maximum demand power, and current usage fee, the user can easily and simply grasp the power supply and demand status while knowing whether power is being used unnecessarily, so that it is easy to save power. .

1 is a block diagram showing the overall configuration according to the present invention,

Explanation of symbols on the main parts of the drawings

15: central processing unit 17: arithmetic processing unit

20, 22, 24, 26, 28: display drive unit

21, 23, 25, 27, 29: display unit

Hereinafter, with reference to the accompanying drawings illustrating a preferred embodiment of the present invention.

Current transformer (CT) (l) which detects the value of the current consumption flowing through each wire according to the three-phase power supplied through the wire as an appropriate ratio of current values by the inverse of the internal winding ratio,

A current-voltage converter 2 for converting and outputting a current value detected by the current transformer 1 into a voltage value;

Instrument transformer (PT) (3) for detecting the value of the voltage applied through the wire as a voltage value proportional to the voltage of the proper magnification according to the winding ratio,

A first pulse width modulator (PWM) 4 for modulating the width of the pulse in response to a modulation signal with respect to the voltage value from the instrument transformer 3 and outputting the pulse width in a duty cycle;

A first multiplier 5 for time-division multiplication by the pulse width duty cycle from the first pulse width modulator 4 while receiving a voltage value from the current-voltage converter 2;

A first integrator 6 which receives a voltage value from the first multiplier 5 and outputs a voltage proportional to the instantaneous power;

A first voltage-frequency converter 7 which receives a voltage proportional to the instantaneous power output from the first integrator 6 and outputs a frequency proportional to the instantaneous power which is a frequency proportional to the voltage as an effective pulse WP; )Wow,

A phase shifter 8 which receives a voltage value proportional to the load power from the instrument transformer 3 and outputs a phase shifted reactive voltage value which is shifted by? / 2, respectively;

A second pulse width modulator 9 for receiving a phase shifted reactive voltage value from the abnormality section 8 and modulating the pulse width in accordance with a modulation signal to output a pulse width duty cycle;

An imaging detector 10 for outputting a phase value PE according to a ground fault or a short circuit of an input wire, with a phase of pulse width duty cycles input from the second pulse width modulator 9;

Time-division according to the state in which the internal analog switch is turned on / off by the pulse width duty cycle from the second pulse width modulator 9 while receiving a voltage value proportional to the consumption current from the current-voltage converter 2. A second multiplier 11 for multiplying each;

A second integrator 12 for converting and outputting a voltage proportional to the instantaneous reactive power when the voltage value from the second multiplier 11 is input;

A second voltage-frequency converter 13 for outputting an invalid pulse (QP) while receiving a voltage proportional to the reactive instantaneous power from the second integrator 12 while preventing the instantaneous reactive power from being affected by the frequency;

While receiving the effective pulse WP, the phase value PE, and the invalid pulse QP as normal values, the clock for setting the time is input from the clock generator 14 to calculate values for the effective power amount, the reactive power amount, and the power factor. A central processing unit 15 for outputting a power pulse signal, an effective pulse compensation signal and an invalid pulse compensation signal;

A time invalid pulse compensation unit 16 which receives an invalid pulse compensation signal from the central processing unit 15 and outputs a modulation signal to the second pulse width modulation unit 9;

An arithmetic processing unit that receives the power pulse signal from the central processing unit 15 and performs timekeeping of the current time and time zone, and at the same time receives a control signal according to a user's processing operation through the switch input unit 18 and outputs various display signals. With 17,

A driving unit 19 which receives the operation display signal from the operation processing unit 17 and notifies the operation state while flashing the light emitting diode L;

A first display driver 20 which receives a display signal of the accumulated power amount up to the present from the operation processor 17 and informs the total amount of power used up to the present by eight digits through the first display unit 21;

A second display driver 22 which receives a display signal for a cumulative amount of power since the previous meter reading date from the arithmetic processing unit 17 and informs the monthly use amount of power by eight digits through the second display unit 23;

A third display driver 24 which receives a display signal for the monthly fee from the arithmetic processing unit 17 after the previous meter reading date and informs the monthly fee through the third display unit 25;

A fourth display driver 26 which receives the current demand power indication signal from the arithmetic processor 17 and informs the amount of power demand currently being used by the fourth display driver 27 as a number;

The fifth display driver 28 which receives the instantaneous usage fee indication signal according to the current demand power from the arithmetic processing unit 17 and notifies the instantaneous charge according to the current demand power through the fifth display driver 29 numerically. It is composed of.

The electricity meter having the present charge display function of the present invention configured as described above detects a current flowing through the wire through the current transformer 1 at a predetermined ratio and converts the current-voltage converter 2 into a voltage value.

And the pulse width modulation duty cycle in which the width of the pulse is modulated by the first pulse width modulator 4 with respect to the voltage value detected by the instrument transformer 3 and by π / 2 during the abnormality section 8. The necessary values are obtained based on the phase shifted reactive voltage value shifted in phase.

The voltage value is time-division multiplied in the first multiplier 5 by the pulse width duty cycle, and then the first voltage-frequency converter 7 obtains a voltage proportional to the instantaneous power by the first integrator 6. Outputs the effective pulse (WP).

The phase shifted reactive voltage value is modulated by the second pulse width converter 9 and outputted in a pulse width duty cycle, and then the phase detection unit 10 detects the phases thereof to detect phases of the wires or short circuits. Output (PE)

The voltage value is multiplied by the second multiplier 11 according to the state in which the analog switch is turned on / off by the pulse width duty cycle from the second pulse width modulator 9, and then the second integrator 12 is subjected to time division multiplication. As a result, the second voltage-current frequency correction unit 13 outputs the invalid pulse QP by converting the voltage into a voltage proportional to the instantaneous reactive power.

Therefore, the central processing unit 15 which receives the effective pulse WP, the phase value PE, and the invalid pulse QP outputs an electric power pulse signal including an effective power amount, a reactive power amount, a power factor, and the like.

The central controller 15 outputs an invalid pulse compensation signal and an effective pulse compensation signal to the first pulse width modulator 4 and the second pulse width modulator 9 as modulation signals.

In addition, the calculation processing unit 17 receiving the above-mentioned power pulse signal divides the clock from the clock generator to calculate the time, performs the time of the present time and time zone, sets / memory switch of the switch input 18, and converts numbers. Through the switch and reset switch, the user can store information such as monthly meter reading date and usage fee set by time, so that the accumulated amount, current power consumption, and current usage fee can be displayed after the previous meter reading date. do.

The driving unit 19 receiving the operation display signal from the operation processing unit 17 flashes the light emitting diode L and notifies the operation state so as to determine whether the current device is operating normally.

In addition, the first display driver 20 receiving the display signal for the accumulated power amount from the operation processor 17 to the present through the first display unit 21 informs the total amount of power used so far as an 8-digit number. do.

The second display driver 22 receiving the display signal for the cumulative power amount after the previous meter reading date from the arithmetic processing unit 17 is notified of the monthly power amount through the second display unit 23 as an 8-digit number.

The third display driver 24 receiving the display signal for the monthly fee after the previous meter reading date from the arithmetic processing unit 17 is to inform the monthly fee through the third display unit 25 numerically.

The fourth display driver 26 receiving the current demand power display signal from the operation processor 17 informs the amount of power demand currently being used through the fourth display driver 27 numerically.

Through the fifth display driver 29, the fifth display driver 28, which receives the instantaneous usage fee display signal according to the current demand power from the operation processor 17, numerically converts the instant charge according to the demand power currently being used. It tells you the price of current electric appliances, so you can be aware of the power you are using unnecessarily and save power.

As described in detail above, the wattmeter having the current charge display function according to the present invention uses the voltage value obtained by converting the current value measured by the current transformer and the voltage value measured by the transformer for the instrument to modulate the effective pulse. Output,

In the instrument transformer outputs a phase value at the voltage value via the abnormal part and the pulse width modulator,

Outputting an invalid pulse from the voltage value converted from the current value and the voltage value via the pulse width modulator;

By displaying the operation, total power, current demand and current charge for the effective pulse, phase value, and invalid pulse, the user can easily and simply grasp the power supply status, and whether the power is currently unnecessary. It can be seen that it is easy to execute power saving.

Claims (1)

The first pulse width modulator 4 and the first multiplier 5 detect current and voltage values for the current flowing through the wire through the current transformer l, the current-voltage converter 2 and the instrument transformer 3. , The first integrator 6, the first voltage-frequency converter 7, the abnormal part 8, the second pulse width modulator 9, the imaging detector 10, the second multiplier 11, the second The amount of power in the central processing unit 15 that receives the effective pulse WP, the phase value PE, and the invalid pulse QP while passing through the integrator 12 and the second voltage-frequency converter 13 is received. In the wattmeter having a current charge display function of outputting the pulse signal, the effective pulse compensation signal and the invalid pulse compensation signal, the calculation processing unit 17 displays information according to the supply of the power amount. A driving unit 19 which receives the operation display signal from the operation processing unit 17 and notifies the operation state while flashing the light emitting diode L; A first display driver 20 which receives a display signal of the accumulated power amount up to the present from the operation processor 17 and informs the total amount of power used up to the present by eight digits through the first display unit 21; A second display driver 22 which receives a display signal for a cumulative amount of power since the previous meter reading date from the arithmetic processing unit 17 and informs the monthly use amount of power by eight digits through the second display unit 23; A third display driver 24 which receives a display signal for the monthly fee from the arithmetic processing unit 17 after the previous meter reading date and informs the monthly fee through the third display unit 25; A fourth display driver 26 which receives the current demand power indication signal from the arithmetic processor 17 and informs the amount of power demand currently being used by the fourth display driver 27 as a number; The fifth display driver 28 which receives the instantaneous usage fee indication signal according to the current demand power from the arithmetic processing unit 17 and notifies the instantaneous charge according to the current demand power through the fifth display driver 29 numerically. Electricity meter with a current charge display, characterized in that consisting of.