KR200254759Y1 - A communication method selectable electronic watt-hour meter for remote inspection - Google Patents

Abstract

The present invention relates to an electronic watt-hour meter equipped with a switch for selecting an information transmission method for remote meter reading, and more specifically, the amount of power metered for each generation and the meter reading information of water, hot water, gas, and heating / heating In the electronic meter for remote meter to transmit to; A switch for selecting a communication method is provided at a predetermined portion of the front surface of the electronic watt-hour meter and transmits in a frequency shift keying method or a spread spectrum (SSM) method according to the switching state, or a wireless RF signal. The present invention relates to a communication type selective remote metering electronic watt hour meter that can transmit the meter reading information to a supplier or a central control station using a wireless communication method or a dedicated line communication method having an RS-485 communication function.

Description

A communication method selectable electronic watt-hour meter for remote inspection

The present invention relates to an electronic wattmeter, and more particularly, to an electronic wattmeter provided with a switch for selecting a method for transmitting information for remote meter reading.

The electricity meter is an instrument that measures the consumption of AC power used for a certain period of time. It is also called an electricity meter or an electricity meter. In general, electricity bills are often determined by the amount of power consumed, so the electricity meter plays a very important role.

In order to read the amount of electricity, gas or tap water used in most homes or offices, the meter reader visits each home or office and reads the amount displayed on the meter installed inside or outside. The data thus read is manually entered into the reading book. After that, the meter reader returns to the office, goes through the computerized input work, and in most cases, a bill is issued to each user by the central system. However, problems such as an increase in labor costs and errors caused by data input and the application of an appropriate fee are continuously emerging.

In addition, one meter is required to be installed in each household, so when applied to an apartment, several meters are installed in one buried box. Therefore, there is a problem that the size of the buried box is increased and the cost of the product price is increased.

To solve this problem, multi-generation electricity meters have emerged. The structure of the conventional multigenerational electronic electricity meter is shown in FIG. When the voltage signal sensed by the meter reading units 11a to 11n is applied, the controller 12 converts and integrates the integrated amount of electricity meter reading unit 12a, and generates multiple generations simultaneously through the input / output separation circuit 12b. Meter the power. When the detected amount of power of each generation is input, the power converted values are separated for each generation and output through the output units 13a to 13n. The power amount information provided through the output units 13a to 130n is displayed on the panel of the LCD display unit 14 by the control signal of the microprocessor 15. The LCD display unit 14 is integrally formed in a buried box in which a circuit for reading the above-described power amount is embedded and embedded in the wall surface. The microprocessor 15 sets an address and inputs a generation number from the outside through the address setting and the external communication line 17 and the external count pulse output unit 18 for remote meter reading. At this time, the generation number is displayed on the panel of the LCD display unit 14 via a loader, which is a routine for loading a program from a predetermined external medium into the main memory device, thereby enabling remote meter reading communication. The above-mentioned lake number is used as an address number on the remote meter reading system program, and the inputted information is stored in the EEPROM 16.

As shown in FIG. 2, the multi-generation electronic electricity meter includes a buried box 200, in which circuit elements such as a circuit board are accommodated and having a flange 201 at an inlet edge thereof, and opening and closing at an inlet of the buried box 200. The main cover 210 and the sub cover 220, which are coupled to each other and have a window 211 to which the LCD display unit 14 is attached and fixed. Inside the sub-cover 220, a terminal coupling part to which input terminals for each generation are connected is provided. And the flange 201 is provided with a sealing portion 205, the cover member 230 for shielding the sealing portion for appearance is provided with a sliding opening and closing.

However, the multi-generation electronic electricity meter only reads the electricity for each household, and in order for the user to check the meter reading for hot water, water, gas, and cooling / heating, the hot water, water, gas, There was an inconvenience to check the usage of the cooling / heating one by one.

In order to solve this problem, a generation remote reading device has been developed to read and display the power generation, water, hot water, gas, and cooling / heating usage of several generations on one display screen sequentially. The configuration is as shown in Figs. It is to be noted that the different reference signs to the same components shown in FIGS. 1 to 2 are for the purpose of identification and do not represent different properties.

Unlike the multi-generation electronic electricity meter shown in FIG. 1, a meter 39 is connected to the water, hot water, gas, and heating / heating supply lines of each generation to detect each metering signal and provide it to the microprocessor. The microprocessor 35 compares, determines, and controls the pulse signal when it is applied from the meter 39. In this case, the amount of power used and the reading values of water, hot water, gas, and heating / heating, which are read for each generation, are sequentially displayed on a panel of one LCD display unit. In addition, when the user inputs any one of electric power, water, hot water, gas, and cooling / heating, the LCD display unit 34 simultaneously displays the meter reading on one panel for each generation lake. It is formed integrally in the buried box 40 is a circuit for measuring the amount of power and the amount of use of water, hot water, gas, cooling / heating and the like.

The method of transmitting meter reading information according to the related arts of FIGS. 1 to 4 has a radio frequency inspection delivery (RF-ID) method for directly connecting a provider-side system and a user wirelessly. This RF-ID method installs the equipment to communicate wirelessly with the digital meter in the user's instrument and connects wirelessly with the system of the supplier side. In other words, when the meter-side data is requested wirelessly from the provider-side system, the meter-side transmitter transmits the radio wirelessly, because each user transmits using a specific frequency. If there is a high possibility of causing crosstalk between the users and a large number of users, the shortage of available bandwidth is difficult. In addition, it is currently impossible to secure a band that can operate within the domestic radio wave band. In addition, although the installation cost is low, it can be applied to existing buildings, and there is an advantage suitable for a broadband area, but there is a problem in that an excessive cost occurs because expensive equipment is used for communication between a user and a supplier.

As a method for solving the problems caused by wireless, there is a dedicated line method. This method connects the central control room and the user's side with a separate dedicated line, collects meter reading data in the central control room by passing information on meter reading between the user and the central control room through this dedicated line, and collects in each central control room. The meter reading data is delivered to the supplier's system and managed. However, this method requires not only enormous cost of using a separate lease line but also a high possibility of disconnection in underground facilities or various constructions after installation, and is applicable only to new buildings, and there is a limitation in a wide range of meter readings. This relationship creates problems in terms of data reliability and management.

The present invention for solving this problem is to provide an electronic electricity meter that can select a communication method for transmitting information to a remote location.

Another object of the present invention is to provide an electronic electricity meter that can change the communication method according to the installation environment of the electricity meter.

Features of the electronic wattmeter according to the present invention for achieving the above object is a remote meter reading electronic wattmeter for transmitting the meter reading information of each generation and the usage metering information of water, hot water, gas, cooling / heating at a distance; It is equipped with RS-232C standard protocol and interconnects to connector of communication module according to each communication method, and transmits meter reading information to central control room according to the connection status.

Detailed features of the electronic electricity meter according to the present invention include a power line communication method using a frequency shift keying method, a dedicated line communication method using an RS-485 line, an RF wireless communication method using a constant frequency band, or an infrared ray. Any one of wireless communication methods may be selected.

In addition, to solve the shortcomings of the dedicated line and the wireless method, the power line communication method adopting the FSK / SSM method is also used. It modulates small signal of data signal on existing 220V power line and transmits it and then demodulates only small signal in receiver to collect data. It is easy to apply to broadband.

1 is a block diagram showing a conventional multi-generation electronic electricity meter,

2 is a block diagram of a multi-generation remote meter reading apparatus according to FIG.

3 is a block diagram showing a conventional multi-generation electronic electricity meter,

4 is a block diagram of a multi-generation remote meter reading apparatus according to FIG.

5 is a block diagram showing the configuration of the electronic meter for remote meter reading according to the present invention.

Hereinafter, the configuration of the present invention and its operation will be described with reference to the accompanying drawings. Figure 5 is a block diagram showing the configuration of a communication type selective remote meter electronic electricity meter according to the present invention.

As shown, the current sensing unit 501 for detecting the amount of current flowing through the power supply line (power line), and the pulse generator 502 for generating a pulse by recognizing the signal provided through the power supply line and A power measurement unit 503 for converting the amount of current detected by the current sensing unit 501 and the pulse provided from the pulse generator 502 into an amount of power and a value provided from the power measuring unit 503 A central processing unit 504 for outputting a control signal for transmitting the control signal to a central control room located at a remote location, and an E ² PROM which stores a program necessary for the operation of the central processing unit 504 and performs processing. 509, a rectifier 505 for providing a stable power source to the watt-hour circuit, and a liquid crystal display (LCD) for displaying the information provided from the central processing unit 504 so that a user can recognize the same. 506), Pulse output unit 507 for outputting two hum LED signals and two signals (effective signal, invalid signal) for use by external users through optical isolation (PC17T1), and protocols converted according to each communication method (protocol) RS-232C communication unit 508 having a).

The current sensing unit 501 supplies a current to the power measuring unit 503 to determine the characteristics of the most important error in the meter. Around the metering chip, there are electrolytic capacitors that dominate the phase, VR4, which dominates the overall gain, and VR1, 2, 3 to compensate for phase imbalance.

The power measuring unit 503 lowers the input voltage to the resistance voltage divider circuit, converts the current signal, and converts the current signal and the input voltage from the current detection circuit through the power conversion integrated circuit IC of the present circuit. It generates an electric signal and transfers it to the pulse generator 502. In addition, the variable resistor is used to correct the measurement load and adjust the reference voltage of the signal processor.

The central processing unit 504 accumulates several generations of power meter reading information at the same time when a voltage signal sensed from each meter reading unit (not shown) sensing power consumption of each household is applied. The power amount information is displayed on the panel of the LCD display unit 506 by the control signal of the central processing unit 504. The LCD display unit 506 is integrally formed in a buried box in which a circuit for reading the above-described power amount is embedded and embedded in the wall surface. The central processing unit 504 sets an address and inputs a generation number from the outside through the address setting and the external communication line and the external count pulse output unit 507 for remote meter reading. At this time, the generation number is displayed on the panel of the LCD display unit 506 via a loader, which is a routine for loading a program from a predetermined external medium into the main memory device, thereby enabling remote meter reading communication. The lake number described above is used as an address number on the remote meter reading system program, and the inputted information is stored in the EEPROM 509.

The CPU 504 compares, determines, and controls the pulse signal when the pulse signal is applied from the power measuring unit 503. At this time, the amount of power used and the reading values of water, hot water, gas, and cooling / heating, which are read for each generation, are sequentially displayed on a panel of one LCD display 506. In addition, the LCD display unit 506 simultaneously displays a reading value on the panel for each generation lake when the user inputs any one of electric power, water, hot water, gas, and cooling / heating. do.

The communication connector connected to the RS-232C communication unit 508 is provided with various communication modules. Each communication module is provided with a protocol that is converted to each communication method in the 232C communication unit. The communication module connected to the communication connector is a power line communication method using a frequency shift keying method, a dedicated line communication method using an RS-485 line, an RF wireless communication method of a predetermined frequency band, or infrared (IR). There may be a wireless communication method used. By using the meter reading information through each communication module to the central control room, it is possible to read the power consumption from a remote location.

Since each configuration and operation of the other electronic electricity meter is the same as mentioned above, the detailed description thereof will be omitted.

As described above, since the electronic electricity meter according to the present invention can set a communication method according to the installation environment of the electricity meter, it can satisfy the specification required by the customer, and can be applied in any region, thereby significantly widening the use range. Has

Claims (2)

In the remote meter reading electronic electricity meter for transmitting the metered power of each generation and the meter reading information of water, hot water, gas, cooling / heating at a long distance; Communication type optional electronic power meter, characterized in that the RS-232C protocol communication unit is interconnected to the connector of the communication module according to each communication method connected to the communication unit, and transmits the meter reading information to the central control room according to the connection. . The method of claim 1; The selectable communication method, Either the power line communication method that transmits by frequency shift keying method, the dedicated line communication method using RS-485 line, the RF wireless communication method of constant frequency band, or the wireless communication method using infrared ray is selected. Communication type electronic electricity meter, characterized in that the can be.