JPS61111469A - Electronic integrating counter - Google Patents

Abstract

PURPOSE:To decide the using state of a load easily and precisely by displaying the ratio of current using weight obtained by a process weighting part to rated process load using weight. CONSTITUTION:When a voltage signal ev proportional to a load voltage is outputted from a transformer 1 and a voltage signal ei proportional to a comsumed current value is outputted from a current transformer, a power conversion circuit 3 multiplies respective voltage signals Hev, ei to find out electric power values ev, ecos and sends the power signal P to a frequency conversion circuit 4. The circuit 4 converts the power signal P into a frequency signal (f) proportional to the power energy and outputs the signal (f) to a frequency dividing circuit 5 and an F/V conversion circuit 11. The circuit 5 divides the signal (f) into 1/N and outputs the divided signals to a counting/display circuit 6. The circuit 6 integrates the divided signals and displays the electric energy on a display unit 6a. On the other hand, the frequency signal (f) sent to the circuit 11 is converted into a voltage signal eD and sent to an LED driving circuit 12 to turn on LEDs by the number of LEDs corresponding to the level of the voltage signal eD.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electronic integrating meter having a function of displaying the usage status of process loads such as electricity, gas, water, etc. relative to the rated load of the meter.

[Technical background of the invention]

An example of a meter that calculates the integrated amount is an electronic wattmeter.

FIG. 5 is a configuration diagram of a conventional electronic watt-hour meter. This watt-hour meter consists of a transformer (hereinafter referred to as P and T) 1 which obtains a voltage signal ev proportional to the load voltage of the power supply line, and a current transformer which obtains a voltage signal el proportional to the consumption current flowing through the power supply line. (hereinafter referred to as C and T) 2 are provided, and these P and T
Each voltage signal e, l output from I, C, T2
ei is sent to the power conversion circuit 3.

The power conversion circuit 3 multiplies each voltage signal ev, el to obtain power P=ey-61-amψ, and outputs this power signal P to the frequency conversion circuit 4. Note that the step ψ is the power factor. As a result, the frequency conversion circuit 4 outputs a frequency signal f proportional to the electric power P, and this frequency signal f is divided into 1/9N by the frequency dividing circuit 5 and displayed on a counter with a display. sent to circuit 6. Thus, the counting display circuit 6
Integral measurement is performed at , and the amount of power is displayed. Note that 7 is a power supply circuit that supplies power to each circuit.

Incidentally, in the above-mentioned watt-hour meter, the usage state of the load power is determined by visually observing the counting operation speed of the display of the counting display circuit 6. That is, when the counting operation speed is fast, it is determined that the power load is close to the rated power of the watt-hour meter, and when the counting operation speed is slow, it is determined that the load is light and smaller than the rated power.

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However, it is very difficult to accurately grasp the usage status of load power by visually observing the counting operation speed, and it is even more difficult to grasp the rotation speed of the disc of an inductive watt-hour meter visually. .

Furthermore, even if the watt-hour meter is equipped with an operation confirmation LED that is activated by the output pulse signal of the frequency dividing circuit 5, the load usage status must be determined based on the degree of blinking of the operation confirmation LED, so it is difficult to accurately judge the load usage status. Load usage status cannot be determined.

[Purpose of the invention]

The present invention was made based on the above-mentioned circumstances, and an object thereof is to provide an electronic integrating meter that can easily and accurately determine the load usage state.

[Summary of the invention]

The present invention calculates the current consumption of process loads such as electricity, gas, and water using a process measuring section, calculates the ratio of the calculated current consumption to the rated process load usage, and calculates this ratio as the load power. This is an electronic totalizing meter that displays information on the circumference status display section so that the usage status of the process load can be easily and accurately determined.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram when the electronic integrating meter of the present invention is applied to an electronic watt-hour meter, and FIG. 2 is an external view of the watt-hour meter shown in FIG. 1. Note that the same parts as in FIG. 5 are given the same reference numerals. That is, 1 is P, T,
2 is C, T.

3 is a power conversion circuit, 4 is a frequency conversion circuit, 5 is a frequency division circuit, 6 is a count display circuit, and 7 is a power supply circuit. Note that the above-mentioned circuits constitute a power meter main body circuit.

Here, a description will be given of a watt-hour meter main body circuit tb watt-hour meter that is applied to a single-phase two-wire system and has a rated voltage of 100 [V] and a rated current of 30 (A). In a watt-hour meter with the above rating, the rated power is 100 (V) x 30 (A) It has an output frequency characteristic as shown in the figure.In other words, the frequency conversion circuit 4 has a total output frequency of 1000 (Hz), and converts the electric power O to 3 [kW] in proportion to this electric power. It has a function of converting the output frequency from 0 to 1000 (Hz).

Now, 10 is a load usage status display unit, which has a function of displaying what proportion of the power load is being used with respect to the rated power 3CkW). Divide the LED bar display consisting of 5 equal parts (referred to as LED) into 5 equal parts, and divide the LED bar display divided into 5 equal parts into 0 to 3 (kW) rated power.
20 inches, 20-40 inches, 40-60%, 60-8 degrees,
It is configured to display at each ratio of 80 to 100%. Specifically, it includes a frequency-voltage conversion circuit (hereinafter referred to as a sill conversion circuit) 11, an LED, a drive circuit 12, and an LED bar display 13. F/V
The conversion circuit 1 has an output voltage characteristic as shown in FIG. 4, and the frequency signal f output from the power conversion circuit 4
It has a function of converting this frequency signal fcO~1000Hz) into a voltage signal eD (0~5V) and outputting it to the LED drive circuit 12.

The LED drive circuit 12 detects the level of the voltage signal eD and drives the number of LEDs to light up according to this voltage level. Further, the LED bar display 13 is provided below the display 6& of the count display circuit 6, as shown in FIG.

Next, the operation of the electricity meter configured as described above will be explained. A voltage signal ev proportional to the load voltage of the feeder line is output from P and T1, and a voltage signal 6i proportional to the consumption current flowing through the feeder line is output from C and T2, and each voltage signal ev + el is sent to the power conversion circuit 3. This power conversion circuit 3 calculates the power e7·eiaysψ by multiplying each voltage signal (3v, J), and sends the power signal P indicating this power e7·Jccwψ to the frequency conversion circuit 4.Therefore, the frequency conversion circuit 4 is the input power, ;f)! MPtlcOtii:ni′″′″L
'fcl! Convert it to i**m@f and divide it into frequency divider circuit 5 and F.
/V converter circuit 1. The frequency dividing circuit 5 divides the frequency signal by 1/ft-N and sends it to the count display circuit 6.

Thereby, the counting display circuit 6 integrates and counts the frequency-divided signal from the frequency dividing port N5 and displays the amount of power on the display 6a.

On the other hand, the frequency signal f sent to the F/v conversion circuit 11 is converted into a voltage signal eD according to the frequency and sent to the LED drive circuit 12. This LED drive circuit 12 detects the level of the input voltage signal en, and drives the number of LEDs to light up according to this level. Here, the voltage signal eD
For example, when the voltage is 2.5 [V], the LED drive circuit 12 drives up to 60% of the LEDs to light up, as shown in FIG.

As a result, as shown in Figure 2, the rated power of the watt-hour meter is 3 (
940 to 60% of the power load is displayed.

In this way, in the electricity meter of the present invention, the frequency signal f corresponding to the range of 0 to 3 (kW) of the frequency conversion circuit 4 is converted into the stain pressure signal eD by the F/V conversion circuit 11, and this voltage The number of LEDs lit on the LED bar display 13 is controlled according to the level of the signal eD to display the load power usage status relative to the rated power, so the load power usage status is L.
According to the ED bar display 13, 0 to 20 degrees, 20 to 40 degrees,
It is displayed in proportions of 40 to 60 inches, 60 to 80%, and 80 to 100 inches, allowing easy and accurate understanding. Additionally, it can be determined whether the rating of the electricity meter being used is appropriate. In other words, the LED bar display 13 is always 80 to 1.
If it displays 00%, it means that the watt-hour meter you are currently using has a low rating, and if it always displays 0 to 20%, it means that you are using a watt-hour meter that has a too high rating. It shows. Therefore, it is possible to replace it with a power meter with an appropriate rating.

Further, it is possible to determine a failure of the power meter main body.

This is the case when the LED bar display 13 is displaying 80 to 100%, but the counting operation speed of the display 6a is slow. Furthermore, when installed with an inductive watt-hour meter,
By comparing the rotational speed of the disk and the number of lit LEDs on the LED bar display 13, the operation of the planning ability meter can be checked.

Note that the present invention is not limited to the above embodiment. In the above embodiment, the ratio is displayed in five stages, but by increasing the number of LEDs, the ratio can be displayed in narrower stages. Furthermore, the load usage status can be displayed linearly by replacing the rod-shaped LED bar display with an LED display that performs display using a linear method.

Further, the output voltage characteristics of the F/V conversion circuit may be changed to receive the division signal of the frequency dividing circuit 5 to drive the LED bar display. We used an LED bar display in consideration of matching the appearance of the power meter, but we replaced it with a display instrument that uses a pointer like a UV meter or a display means whose brightness changes in proportion to the usage status of the power load. You may.

The present invention is not only applicable to electronic watt-hour meters, but can also be applied to electronic integrating meters, such as gas meters and water meters, to grasp the load usage status relative to the rated load.

〔Effect of the invention〕

According to the present invention, the ratio of the current usage amount determined by the process measuring section to the rated process load usage amount is determined;
Since this ratio is displayed on the load usage state display section, it is possible to provide an electronic integrating meter that allows the load usage state to be determined easily and accurately.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram when the electronic integrating meter according to the present invention is applied to an electronic watt-hour meter, Fig. 2 is an external view of the watt-hour meter shown in Fig. 1, and Fig. 3 is the same as Fig. 1. 4 is an output frequency characteristic diagram of the frequency conversion circuit in the watt-hour meter shown in FIG. 4, an output voltage characteristic diagram of the F/V conversion circuit in the watt-hour meter shown in FIG. FIG. 1 , , , , □, 2.1 to □, 3-@, ka, □
4. Frequency conversion circuit, 5. Branch circuit, 6.
...Counting display circuit, 10...Load usage status display section, 1
1... Frequency-voltage conversion circuit (F/V conversion circuit), 1
2...LED drive circuit, 13...IJD bar display. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2L Figure 3 s4 Figure 11 Comparison El-1, 1

Claims (3)

[Claims] (1) In an electronic integrating meter that calculates the cumulative usage of a process load including electricity, gas, and water, there is a process measuring unit that calculates the current usage of the process load, and a process meter that calculates the current usage of the process load, and a process meter that calculates the current usage of the process load, and 1. An electronic integrating meter comprising: a load usage state display unit that calculates a ratio and displays this ratio. (2) The electronic integrating meter according to claim (1), wherein the load usage state display section includes a bar display in which a plurality of light emitting elements are arranged in series. (3) The load usage status display section includes a voltage conversion circuit that converts the current usage amount of the process load determined by the process measurement section into a voltage signal indicating the ratio to the rated process load usage amount, and a voltage signal from this voltage conversion circuit. An electronic integrating meter according to claim 1, comprising a bar display and a display drive circuit that drives and controls the number of light emitting elements of the bar display according to a signal level.