KR20010016548A - Apparatus for and method of detecting reverse count of OMR watt-hour meter - Google Patents

Abstract

PURPOSE: A device for observing reverse rotation of a short distance checking radio gauger and a method thereof are provided to detect the operation of a gauger in order to use electricity illegally by storing the value with detecting the reverse rotation of a power gauger. CONSTITUTION: A device for observing reverse rotation of a short distance checking radio gauger and a method thereof include a few stages. In the stages of 401-405 it is judged if the sense signal is changed from the high level to the low level or not by checking the sense signal input from the read switch and the timer is operated when the sense signal is changed from the high level to the low level and the pulse width is counted and the sense signal is monitored on and on. In the stages of 406-408 the count value of the timer is stored as the first pulse count value when the sense signal is changed from the low level to the high level and the timer is cleared and the sense signal is monitored on and on. In the stages of 409-411 the pulse width is counted by the timer when the sense signal is changed from the high level to the low level and the sense signal is monitored on and on. In the stage of 412 the count value of the timer is stored as the second pulse count value when the sense signal is changed from the low level to the high level and the timer is cleared. In the stages of 413-415 the first pulse count value and the second pulse count value are compared and the amount of the use of power is gauged by adding the count value by 1 when first pulse count value is larger than the second pulse count value and if it is the opposite case, the reverse rotation count value is accumulated.

Description

Apparatus for and method of detecting reverse count of OMR watt-hour meter}

The present invention relates to a meter for short range wireless metering, and more particularly, to an apparatus and method for detecting reverse rotation of a weighing display device in a meter for short range wireless meter reading.

In general, the integrated wattmeter is used to detect the power used in the home as well as the industry in real time and integrate the amount of used power, and an induction type wattmeter is widely used. The inductive integrated power meter consists of a voltage coil, a current coil, an aluminum rotating disc, a braking magnet, and a metering display device to mechanically count the number of revolutions of the rotating disc according to the amount of current used to display the integrated power amount.

As a general meter for improving the mechanical structure of the meter for use in the wireless meter reading (OMR), as shown in Figure 1, the magnet 118 on a part of the display rotating plate 114 of the metering display device that rotates once when using 1Kwh. ), And the reed switch 121 generates a pulse signal corresponding to the rotational speed of the display rotating plate, and the microcomputer 122 counts it to electronically measure the power consumption.

Referring to FIG. 1, when the aluminum disc 111 rotates in proportion to the power consumption due to the vortex action of the voltage coil and the current coil, the power consumption is displayed on the meter display device by the gear unit 113. At this time, the weighing display device displays the usage amount up to one decimal place, such as "0000.0 KHw," and each display value is determined by one rotation of the display rotating plates 114, 115, and 116 on which the number is displayed on the outer surface. , 3, 4, 5, 6, 7, 8, 9, 0 are repeatedly displayed, and the display value of the higher digit is increased by 1 each time the display rotating plate of the lower digit is rotated once. In order to electronically measure the mechanical display value, a magnet 118 is attached to a predetermined position of the display rotating plate 114 which rotates once at 1 Kwh, and a reed switch 121 is installed near the display rotating plate to display the rotating plate ( One pulse is generated in one rotation of 114), and this pulse is counted to electronically measure the amount of power used. The measured value is accumulated and stored in the EEPROM (123), and when the meter reading request signal is received through the wireless module 124, the stored weighing data is transmitted wirelessly.

On the other hand, it is often illegal to reversely rotate the metering plates because of the power usage fee according to the power metering value. As such, when the rotating plates are reversely rotated, there is a difference between the actual usage and the weighing value, and there is a problem in that the weighing machine is too crowded.

An object of the present invention is to provide an apparatus and method for detecting the rotation of the rotating plate in the short range wireless meter to solve the above problems.

1 is a configuration example of a general wireless meter reading,

Figure 2 is a schematic diagram showing the configuration of a wireless meter reading meter according to the present invention,

3 is a sensor output waveform diagram of a wireless meter reading meter according to the present invention,

4 is a flowchart illustrating a reverse rotation detection method of the wireless meter reading meter according to the present invention.

* Explanation of symbols for main parts of the drawings

100: non-reading meter 110: mechanical weighing module

120: electronic weighing module 113: gear unit

114,115,116: display tumblers

118,204,206: magnet

211: reed switch 210: wireless meter reading module

212: micom 213: wireless module

214: Ypyrom

In order to achieve the above object, the device of the present invention, a voltage coil and a current coil, an aluminum rotating disc, a meter including a metering display device, comprising: a display rotating plate having at least two magnets having different lengths; Switching means for generating at least two or more pulses having different pulse widths corresponding to a length of a magnet when the display rotating plate is rotated; And control means for receiving the pulse of the switching means, detecting the forward rotation and the reverse rotation according to the arrangement order of the pulses, and storing each rotation count value.

In addition, in order to achieve the above object, the method of the present invention, in the wireless meter reading meter, comprising the steps of: generating at least two pulses having different pulse widths from the rotation of the display rotating plate attached to the magnets of different lengths; Counting a pulse width of each generated pulse; And comparing the count value of the counted first pulse with the count value of the second pulse to determine reverse rotation and forward rotation of the display rotating plate.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic diagram showing the configuration of a wireless meter reading meter according to the present invention.

The wireless meter reading meter according to the present invention, in a general meter including a voltage coil and a current coil, an aluminum rotating disc, and a weighing display device, magnets 204 and 206 having different lengths attached to the display rotating plate of the weighing display device, and the magnets 204 and 206, respectively. Reed switch 211 is turned on by the contact, and the on / off of the reed switch 211 is counted to count the length of the pulse width generated by the magnets (204, 206), compare the count value and the forward rotation and It is composed of a microcomputer 212, Y pyrom 214, the wireless module 213 for determining the reverse rotation.

In the embodiment of the present invention, magnets 204 and 206 having different lengths are attached to each other at predetermined positions of the display rotating plate indicating 1 Kwh in one rotation in the display rotating plate of the metering device displaying "0000.0 Kwh". At this time, in the embodiment of the present invention, the magnet is disposed so that the long magnet 204 is first detected during the forward rotation and the short magnet 206 is detected later. Therefore, the pulse width of the pulse generated by the rotation of the display rotating plate 202 can be counted and compared to determine whether it is forward rotation or reverse rotation.

The reed switch 211 outputs a low level when the magnet is located close by the rotation of the display rotating plate and outputs a low level. Since two magnets 205 and 206 are attached to the display rotating plate 202 to which the present invention is applied, two pulses are generated by one rotation. One end of the reed switch 211 is grounded, and the other end of the reed switch 211 is pulled up to the Vcc voltage through a resistor and connected to the input terminal of the microcomputer 212. Accordingly, when the contact of the reed switch 211 is turned off, the high level is applied to the microcomputer 212, and when the contact of the reed switch 211 is turned on by the magnet, the low level is applied to the microcomputer 212.

According to the present invention, as shown in FIG. 3, the signal output by the reed switch 211 by one rotation of the display rotating plate with two magnets varies depending on the forward rotation and the reverse rotation. That is, when the display rotating plate rotates one rotation at the same rotation speed, as shown in (a) of FIG. 3, the first low pulse having a wide pulse width is generated by the long magnet 204 and then shortly again. A second low pulse having a narrow pulse width is generated by the magnet, but during reverse rotation, as shown in (b), a second low pulse having a wide pulse width is generated after the first low pulse having a narrow pulse width. Therefore, in the present invention, the pulse width of the low pulse is counted and then compared with each other to determine forward rotation or reverse rotation.

The microcomputer 212 operates according to a predetermined program, counts a detection signal input through the reed switch 211, electronically measures the amount of power, stores the power amount in the Y pyrom 214, and the handy terminal through the wireless module 213. When the meter is requested from the meter, the stored weighing data is transmitted through the wireless module 213. At this time, according to the present invention, the microcomputer 212 determines the forward rotation or the reverse rotation by counting the pulse width of the detection signal input from the reed switch 211, and stores the number of rotations separately from each other. According to the present invention, since two pulses are generated when 1 Khw is used, power consumption can be easily calculated from the count value of the pulses.

4 is a flowchart illustrating a reverse rotation detection method of the wireless meter reading meter according to the present invention.

Referring to FIG. 4, the sensing signal input from the reed switch is examined to determine whether the change is from the high level to the low level. When the change from the high level to the low level, the timer is operated to count the low pulse period (pulse width) and continuously monitor the detection signal to determine whether the low level changes to the high level again (401 to 405).

When the detection signal is changed from the low level to the high level, the timer count value is stored as the first pulse count value, the timer is cleared, and the detection signal is continuously monitored (406 to 408).

Subsequently, when the detection signal changes from the high level to the low level, the timer is operated to count the low pulse duration (pulse width) and continuously monitor the detection signal to determine whether the low level is changed back to the high level (409). ~ 411).

When the detection signal changes from the low level to the high level, the timer count value is stored as the second pulse count value and the timer is cleared (412).

Next, the first pulse count value is compared with the second pulse count value, and when the first pulse count value is greater than the second pulse count value, it is determined as forward rotation. Then, the count value is increased by 1 to measure power consumption, and vice versa. After the determination, the reverse count value is accumulated separately (413 to 415).

The accumulated reverse rotation count value is transferred to the handy terminal together with the metering value at the time of meter reading, and may be used for cause analysis when the mechanical metering value and the electronic metering value do not match.

As described above, according to the present invention, by detecting the reverse rotation of the electricity meter and storing the value, it is possible to detect the operation of the meter for illegal use of electricity, and the mechanical and electronic weighing values do not match. If not, there is an advantage to enabling cause analysis.

Claims (3)

In the meter which includes the voltage coil and the current coil, the aluminum rotating disc, the weighing display device, A display rotating plate to which at least two magnets having different lengths are attached; Switching means for generating at least two or more pulses having different pulse widths corresponding to a length of a magnet when the display rotating plate is rotated; And And a control means for receiving the pulse of the switching means to detect the forward rotation and the reverse rotation according to the arrangement order of the pulses, and to store each rotation count value. The apparatus of claim 1, wherein the switching means is a reed switch. In the wireless meter reading meter, Generating at least two or more pulses having different pulse widths from the rotation of the display rotating plate with magnets different in length from each other; Counting a pulse width of each generated pulse; And And comparing the counted value of the counted first pulse with the counted value of the second pulse to determine reverse rotation and forward rotation of the display rotating plate.