KR101040114B1 - Electronic power meter and display method using the same - Google Patents

Abstract

Disclosed is an electronic watt-hour meter including a plurality of meter reading information, displaying the meter reading information in a cyclic manner for a predetermined interval, and selectively displaying meter reading information in a fixed manner in response to external input. The electronic watt-hour meter includes a power unit, a control unit, a power amount detection unit, a display unit, and an external device unit including at least one of a menu button, a moving button, and an input button. The electronic watt-hour meter further includes an external signal supply button for generating an external signal. The controller responds to the external signal generated through the external signal supply button to supply an information item currently displayed on the display unit 1 display mode to the second display mode.

Description

TECHNICAL FIELD [0001] The present invention relates to an electronic watt-hour meter and an electronic watt-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watt-hour meter capable of checking the amount of power used, and more particularly, to an electronic watt-hour meter and an electronic watt-hour meter display method capable of selectively displaying meter reading information.

A watt-hour meter is used to measure the amount of power consumed by the consumer. Conventional watt-hour meters include a mechanical watt-hour meter using a "gear-type register" and an electronic watt-hour meter that has an LCD display and measures power consumption according to electric field change.

1 is a view showing an example of a conventional mechanical watt-hour meter.

Referring to FIG. 1, in a conventional mechanical watt-hour meter, an electromagnetic force proportional to the amount of power used by a user is applied to a rotating disk to rotate, and the rotational force is transmitted to a tooth-type resist using a gear- do.

The mechanical watt-hour meter generally has a merit that it is simple and easy to judge because it shows only the current cumulative effective electric power amount of which the user or a meter reading company of the electric power company is mainly interested. However, it can not provide various meter reading information.

FIG. 2 is a view showing an example of a conventional electronic watt-hour meter, and FIG. 3 is a view showing an example of meter reading information circulated by an electronic watt-hour meter.

2 and 3, the conventional electronic watt-hour meter includes a terminal block 21 for fastening an incoming power source, an LCD display panel 24 for displaying related information, and a fastening screw for fastening the watt- And an operation push button 23 such as 'menu, movement, and input' for setting the internal function of the watt hour meter.

The main display contents of the LCD display panel 24 include a cyclic display item number 24-1, an integer value 24-2 indicating each meter reading information, and a unit display 24-3 of each meter reading information do. Then, the LCD display panel 24 alternately displays information of the next item every six seconds according to various meter reading information.

For example, in FIG. 3, the detailed contents appearing on the LCD display panel 24 is the 'previous month cumulative effective electric power amount (kWh)' corresponding to the circulation item 'item 5'.

Such an electronic watt-hour meter has an advantage that it can provide various meter reading information, but it has a disadvantage that it is required to display the meter reading information circularly for a predetermined interval in order to display it on one LCD display.

In addition, the main interest of the general user (customer) or the weighing facility manager is in the present cumulative effective power amount of the current month and the current total cumulative effective power amount, and it is disadvantageous that only confusion is added by showing it in a recursive manner together with other meter reading information.

The present invention has been made in view of the problems of the conventional mechanical and electronic watt-hour meters described above, and it is an object of the present invention to provide a meter which has a plurality of meter reading information and circulatively displays the meter reading information for a predetermined interval, Or an electronic watt hour meter capable of selectively displaying one meter reading information, in particular, meter reading information capable of displaying a current total accumulated active power amount, which is a main object of interest of the user, in a fixed manner in response to providing an external input by pressing a new button .

According to an aspect of the present invention, there is provided an electronic device including an external device unit including at least one of a power unit, a control unit, a power amount detecting unit, a display unit, and a menu button, The electronic watt-hour meter further includes an external signal supply button for generating an external signal, and the control unit displays the current signal on the display unit in response to the external signal generated through the external signal supply button. Is changed from the first display mode to the second display mode and displayed.

One of the first display mode and the second display mode may display one of the plurality of information items fixedly and the other one of the plurality of information items may be circularly displayed at a time interval.

Wherein the plurality of information items includes at least one of a current date, a current time, a total accumulated active power amount, a current accumulated reactive power amount, a previous month accumulated active power amount, a previous month accumulated reactive power amount, a previous monthly accumulated maximum demanded power, And the fixedly displayed information item may be the current cumulative effective power amount.

The current cumulative effective power amount, which is displayed in a fixed manner, can be divided and displayed by time zone.

According to another aspect of the present invention, there is provided an electronic watt hour meter including a power unit, a control unit, a power amount detecting unit, a display unit, and an external device unit including a menu button, a moving button, and an input button, A first AND logic to which a menu button and a movement button are respectively connected to input terminals, a second AND logic to which input terminals are respectively connected to the movement button and the input button, and input terminals to the menu button and the input button, A third AND logic to be connected, and OR logic to receive an output from the first, second, and third AND logic, wherein when at least two of the three buttons are pressed at the same time, And the control unit changes the information item currently displayed on the display unit from the first display mode to the second display mode in response to the generated external signal It will be displayed.

One of the first display mode and the second display mode may display one of the plurality of information items fixedly and the other one of the plurality of information items may be circularly displayed at a time interval.

According to still another aspect of the present invention, there is provided a display method of an electronic watt hour meter, the display method comprising the steps of: displaying an information item in a first display mode; Generating an external signal from an external device unit including at least one of a menu button, a movement button, and an input button; Instructing the display unit to display the information item in a second display mode in response to the external signal; And displaying the information item in the second display mode in response to the command.

The step of generating the external signal may include a step of generating an external signal by pressing an external signal supply button provided to generate the external signal.

The step of generating the external signal may include a step of simultaneously pressing at least two of the menu button, the movement button, and the input button.

As described above, the electronic watt-hour meter capable of selectively displaying the meter reading information according to the present invention includes a plurality of meter reading information, displays the meter reading information in a circulating manner for a predetermined interval, and presses a button or a new button provided in the watt- The present invention can provide a fixed meter reading information, in particular a current total accumulated active power amount, which is a main interest of the user, and thus can provide a limited meter reading information of a conventional mechanical watt- It is possible to solve the disadvantage of confusion through the provision of the circulating formula of all the meter reading information that the reader has.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical meanings and concepts of the present invention.

The embodiments described in the present specification and the configurations shown in the drawings are preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention and thus various equivalents and modifications Can be.

First, prior to a full description of an embodiment of the present invention, the terms appearing in this embodiment will be briefly defined.

Throughout the present description, the term 'circulating indication' refers to, for example, the current date, current time, total accumulated active power amount, current accumulated reactive power amount, previous month accumulated reactive power amount, The maximum demand power, the monthly average power factor, and the regular meter reading day are displayed at predetermined time intervals.

Further, throughout this specification, the term 'fixed display' means that any one of the above-mentioned information items is continuously displayed constantly.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a front view schematically showing an electronic watt-hour meter capable of selectively displaying meter-reading information according to an embodiment of the present invention, and FIG. 5 is a schematic view of an electronic watt-hour meter capable of selectively displaying meter information according to an embodiment of the present invention. As shown in Fig.

4 and 5, a watt-hour meter 1 according to an embodiment of the present invention may be, for example, an electronic watt-hour meter having an input power source of a single-phase 2-wire type and includes a power source unit 10, a control unit 20, ), A display unit 40, and an external device unit 50.

The power supply unit 10 may include, for example, a power supply transformer 10-1 and a power supply circuit 10-2, and supplies input power to the control unit 20. [

The power amount detecting unit 30 detects the voltage and current from the input power and detects the amount of power by multiplying. Therefore, the power amount detecting unit 30 may include a voltage detecting unit 30-1, a current detecting unit 30-2, and a multiplier 30-3, as shown in the figure.

Information on the amount of power measured by the power amount detecting unit 30 can be displayed through the display unit 40 via the control unit 20. [

The external device unit 50 generates an external signal via a push button 51, more specifically, an external signal supply button 51-4 to be described later, and transmits the generated external signal to the control unit 20 . As shown in Fig. 3, the push button 51 is provided at the upper left side of the watt hour meter 1 with three (3) buttons including a menu button 51-1, a move button 51-2 and an input button 51-3 It can be a push-type switch and can be used for setting the time at initial installation of the watt hour meter, setting the meter reading date, and setting various test modes.

The menu button 51-1 selects and confirms the item to be set, the move button 51-2 is for moving the setting contents, and the input button 51-3 is for changing the number and setting contents / RTI >

In addition, the present embodiment may further include an external signal supply button 51-4 for causing the external device unit 50 to generate an external signal when pressed.

In the present embodiment, the external signal supply button 51-4 is provided in addition to the existing three push buttons 51, but the present invention is not limited thereto. For example, of the three push buttons 51, It is also possible to provide an external signal by pressing the push button 51 at the same time. An example of such a case will be described later.

When the first external signal is received from the external device unit 50 in the case where the circulating item display is currently being performed in the display unit 40, the controller 20 responds to the received external signal to calculate the ' In the case where only the 'current total accumulated active power amount' is fixedly displayed in the current display unit 40, the display unit 40 instructs the display unit 40 to display only the ' And instructs the display unit 40 to display.

If an external signal is further received from the external device unit 50, the control unit 20 can instruct the display unit 40 to return to the original display mode.

The display unit 40 displays the display items in a cyclic manner or a fixed manner according to a command of the control unit 20 as described above.

In the embodiment of the present invention, the 'current cumulative effective power amount' is continuously displayed in the fixed display, for example, a form that can be applied to the low pressure type first watt-hour meter is illustrated. However, the present invention is not limited to this, , A two-watt-hour watt-hour meter that alternately displays the "total cumulative active power amount currently" by day and night time, or three or more watt-hour meters.

Hereinafter, an operation example of an electronic watt-hour meter capable of selectively displaying meter reading information according to an embodiment of the present invention will be described with reference to FIG.

In this embodiment, it is assumed that the watt hour meter information including the current meter reading information is displayed in a circulating manner at predetermined intervals through the display unit 40 of the watt hour meter 1, but the present invention is not limited to this, For example, when the current total cumulative effective electric energy amount is fixedly displayed and then converted into a cyclic item indication.

In this embodiment, the push button 51 is provided with an external signal supply button 51-4 in addition to the existing menu button 51-1, movement button 51-2, and input button 51-3 However, the present invention is not limited to this, and a combination of the existing menu button 51-1, the movement button 51-2, and the input button 51-3, as will be described later with reference to FIG. 7, So as to exhibit the same function and effect.

6 is a flowchart schematically showing an example of operation of the watt hour meter 1 according to the embodiment of the present invention.

Referring to Fig. 6, watt-hour meter information including meter reading information is displayed on the display unit 40 in a cyclic manner (step S10). Next, when the user presses the external signal supply button 51-4, the external device unit 50 generates an external signal corresponding thereto.

The generated external signal is transmitted to the controller 20 (step S20). In response to the received external signal, the control unit 20 instructs the display unit 40 to convert the current display mode from the cyclic-type to the fixed-type (step S30).

The display unit 40 displays the cyclic display according to a command from the control unit 20 in a fixed manner with any one set information item, for example, the current cumulative effective power amount (step S40).

In the case of a type 2 watt-hour meter in which only the 'current total accumulated active power amount' is continuously displayed in this step S40, for example, only the 'current total accumulated active power amount' for each day of the week and the night time period other than the low- The total cumulative effective power amount for the daytime and nighttime time periods can be alternately displayed.

By doing so, the user can easily confirm the current cumulative effective power amount of interest among the various information items only without confusion.

Next, when the user presses the external signal supply button 51-4 again in a state where the total accumulated active power amount is displayed on the display unit 40 as described above, the external device unit 50 again generates an external signal .

The generated external signal is transmitted to the control unit 20 (step S50), and the controller 20 instructs the display unit 40 to convert the current display mode from the fixed type to the cyclic type in response to the received external signal Step S60).

In response to the command from the control unit 20, the display unit 40 converts the currently displayed cumulative effective power amount into a fixed form and displays all the information items in a cyclic manner at a predetermined interval (step S10).

By doing so, the user can check other information items other than the current cumulative effective power amount as well as a conventional electronic watt-hour meter.

7 is a diagram illustrating an example of an external device for generating an external signal using a combination of existing push buttons without adding an external signal supply button according to an embodiment of the present invention.

7, the external device unit 50 according to the present embodiment includes three menu buttons 51-1, 51-2, and 51-3. A push button 51, three AND logic 52, one OR logic 53, and a signal generator 54. [

The AND logic 52 and the OR logic 53 may be generally AND logic and OR logic of a generally known type and are not particularly limited.

Three of the AND logic 52 are provided and each of the two inputs is connected to two pushbuttons 51 which are adjacent to each other.

Therefore, in order for an output from the AND logic 52 to occur, the two pushbuttons 51 connected to the AND logic 52 must be simultaneously pressed.

The OR logic 53 can provide the output signal to the signal generator 54 and the signal generator 54 (see FIG. 5), if there is only output for at least one of the three AND logic 52 once by the OR logic 53, Can generate an external signal.

The AND logic 52 and the OR logic 53 are used to configure the display mode of the information items displayed on the display unit 40 to be changed using the existing three push buttons 51 as they are, It will be appreciated that the AND logic 52 and the OR logic 53 do not need to be specifically provided in the configuration in which the external signal supply button 51-4 is provided separately.

In the above embodiment, the information items are converted / displayed in a fixed manner and a circulating manner through the display unit 40. However, the present invention is not limited to this. For example, the watt-hour meter 1 and the in- The present invention is not limited thereto.

Although the total accumulated active power amount is exemplified as an example of the information item displayed in a fixed form in the above embodiment, the present invention is not limited to this and may be one of various other information items. In addition, (Not shown), which can be set to a predetermined value.

For example, the present invention is not limited to this. For example, in the case of the two kinds of metering, the present cumulative total accumulated electric power amount of each of the first time period and the second time period is Only the active power amount may be alternately displayed at predetermined time intervals, for example, at intervals of 30 seconds.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. In addition, it is obvious that various modifications and variations can be made without departing from the scope of the present invention by anyone skilled in the art.

1 is a view showing an example of a conventional mechanical watt-hour meter;

2 is a view showing an example of a conventional electronic watt-hour meter;

3 is a diagram showing an example of meter reading information that the electronic watt hour meter shows in a circulating manner;

FIG. 4 is a front view schematically showing an electronic watt-hour meter capable of selectively displaying meter reading information according to an embodiment of the present invention; FIG.

5 is a block diagram schematically illustrating an electronic watt-hour meter capable of selectively displaying meter reading information according to an embodiment of the present invention;

6 is a flow chart schematically illustrating an example of operation of a watt hour meter 1 according to an embodiment of the present invention; And

7 is a diagram illustrating an example of an external device for generating an external signal by a combination of existing push buttons without adding an external signal supply button according to an embodiment of the present invention.

Claims (12)

An electronic watt-hour meter including an external device section including a power section, a control section, a power amount detection section, and a display section, The power supply unit may include a power supply circuit to supply input power to the control unit, Wherein the power amount detecting unit detects a voltage and current from the input power and detects a power amount by multiplying, Wherein the external device unit includes an external signal supply button for generating an external signal, Wherein the control unit changes the information item currently displayed on the display unit from the first display mode to the second display mode in response to the external signal generated through the external signal supply button. The method of claim 1, wherein one of the first display mode and the second display mode is one of a plurality of information items fixedly displayed and the other one of the plurality of information items is circularly displayed at a time interval Wherein the electronic watt-hour meter is an electronic watt-hour meter. The method of claim 2, wherein the plurality of information items includes at least one of a current date, a current time, a total accumulated active power amount, a present accumulated reactive power amount, a previous month accumulated active power amount, a previous monthly accumulated reactive power amount, And a regular meter reading date, wherein the information item displayed in a fixed manner is a total cumulative active power amount. The electronic watt-hour meter according to claim 3, wherein the current accumulated cumulative effective power amount displayed as fixed is divided and displayed by time zone. An electronic watt-hour meter comprising a power unit, a control unit, a power amount detection unit, a display unit, and an external device unit including a menu button, a movement button, and an input button, The external device unit includes a first AND logic to which the input terminal is connected to the menu button and the movement button, a second AND logic to which the input terminal is connected to the movement button and the input button, respectively, A third AND logic to which each of the input terminals is connected, and OR logic that takes as input the output from the first, second, and third AND logic, wherein at least two of the three buttons are pressed simultaneously Wherein the control unit changes an information item currently displayed on the display unit from the first display mode to the second display mode in response to the generated external signal. 6. The method of claim 5, wherein one of the first display mode and the second display mode is one of a plurality of information items fixedly displayed and the other one of the plurality of information items is circularly displayed at a time interval Wherein the electronic watt-hour meter is an electronic watt-hour meter. The method according to claim 6, wherein the plurality of information items includes at least one of a current date, a current time, a total accumulated active power amount, a present accumulated reactive power amount, a previous month accumulated active power amount, a previous month accumulated reactive power amount, And the regular meter reading date, and wherein the fixedly displayed information item is the total accumulated active power amount. The electronic watt-hour meter according to claim 7, wherein the current accumulated cumulative effective power amount displayed in the fixed form is displayed for each time zone. Displaying the information item in a first display mode; Generating an external signal from an external device unit including at least one of a menu button, a movement button, and an input button; Instructing the display unit to display the information item in a second display mode in response to the external signal; And And displaying the information item in the second display mode in response to the command. The method of claim 9, wherein one of the first display mode and the second display mode is one of a plurality of information items fixedly displayed and the other one of the plurality of information items is circularly displayed at a time interval And a display unit for displaying the electronic watt hour meter. The method as claimed in claim 10, wherein the generating of the external signal comprises generating an external signal by pressing an external signal supply button provided to generate the external signal. 12. The method as claimed in claim 11, wherein the step of generating the external signal includes a step of simultaneously pressing at least two of the menu button, the movement button, and the input button.

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