KR100316485B1 - The electronic watt-hour metter for multiple house hold - Google Patents

Abstract

PURPOSE: An electronic watt-hour meter for multi-family is provided, which is capable of measuring power consumption of N families only using one watt-hour meter. CONSTITUTION: The first power supply part(3) supplies a 12V power to a circuit, and the second power supply part(4) supplies a 5V power to a circuit using an output of the first power supply part(3). A reference voltage part(5) supplies a reference voltage of 2.5V to a digital signal processor(14). A super condenser(7) stabilizes a backup power from a backup power part(6) to output a stabilized voltage to a microprocessor(15). A resistor divider(8) detects a primary voltage so as to be supplied to the digital signal processor. Current sensors(9-13) detects respective primary current so as to be supplied to the digital signal processor. The digital signal processor(14) converts sensed voltage and current signals into digital signals and calculates power consumption of each family using the converted digital signals. The microprocessor(15) outputs the calculated values and controls a communication mode for a remote probe. An LCD display part(16) displays an output of the microprocessor(15), and EEPROM(17) stores outputs of the digital signal processor and the microprocessor. Oscillators(20,21) supply clock signals to the digital signal processor and the microprocessor, respectively.

Description

Multi-generation electronic wattmeter {THE ELECTRONIC WATT-HOUR METTER FOR MULTIPLE HOUSE HOLD}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a multi-generation electronic electricity meter, and more particularly, to a multi-generation electronic electricity meter which enables metering of electric power by installing one instrument in a N-generation consumer.

Conventionally, the mechanical ordinary electricity meter is to be installed independently of the meter 2 for each generation separately from the main meter 1 having the electricity level indicator 1a, the terminal plate 1b, etc. in the case of a multi-family house as shown in FIG.

Therefore, for power generation metering for generation N, there are difficulties in installing N + 1 electricity meters on a daily basis, difficulty in securing installation time and installation space, increase in construction cost, and aesthetic problems.

The present invention relates to one meter for N generations; The amount of power supplied to each household (consumer) is detected by the sensor means, and the detected power of each generation N is integrated and stored by digital signal processing and microprocessor, and the calculated amount of power is displayed and displayed. It provides a multi-generation electronic electricity meter that has the same effect as the N-generation meter with only one remote meter.

1 is a configuration diagram of a conventional mechanical ordinary power meter

Figure 2 is a block diagram of a multi-generation electronic electricity meter of the present invention

3 is a block diagram of a first embodiment of the present invention;

4 is a configuration diagram of a second embodiment of the present invention;

5 is a configuration diagram of a third embodiment of the present invention.

Fig. 2 is a block diagram of a multi-generation electronic electricity meter of the present invention.

The digital signal processor includes a first power supply unit 3 for supplying 12V power to the circuit, a second power supply unit 4 for supplying 5V power to the circuit from the output of the second power supply unit 3, and a 2.5V reference voltage. (14) (DSP: a reference voltage section 5 for supplying a digital signal processor, a backup power supply (Battery) 6 for supplying backup power, and the 5V power supply 4 and the backup power supply (6) A supercapacitor 7 for stabilizing the output and supplying it to the microprocessor 15, a resistor voltage divider 8, and a predetermined phase current as a means for detecting and inputting a predetermined phase voltage to the digital signal processor 14; As a means for detecting and supplying the signal to the digital signal processor 14, current sensors 9 to 13 and the sensed voltage and current sensor signals are input to convert the input signal into a digital signal and use the digitally converted signal. To calculate the amount of power used by each household A microprocessor 15 for receiving the signal calculated by the digital signal processor 14, the digital signal processor 14, and displaying and outputting the same, and performing a control such as a communication for remote meter reading, and the microprocessor. EEPROM 17 as a nonvolatile memory means for storing information processed by the digital signal processor 14 and the microprocessor 15, and an LCD display unit 16 for displaying the amount of power of generation N outputted from (15). And a connector 18 and an optical communication port 19 as communication connection means for transmitting and receiving the processed information, an oscillation circuit 20 for supplying a clock signal to the digital signal processor 14, and the microprocessor. And an oscillation circuit 21 for supplying a clock signal to the numeral 15.

3 to 5 show embodiments of the multi-generation electronic wattmeter of the present invention configured as described above.

In the case of FIG. 3, the circuit of FIG. 2 is formed by the one board 22 having one LCD display unit 16, and the current sensor CT is provided on the power supply line introduced into each generation. One case.

In the case of FIG. 4, the circuit of FIG. 2 is configured by dividing the LCD board 16 into N boards 22a corresponding to each generation.

In the case of Fig. 5, the circuit of Fig. 2 is composed of N LCD display portions 16a corresponding to each of N generations and N boards 22a corresponding to each of N generations.

2, the operation of the present invention will be described.

The first power supply unit 3 rectifies and smoothes the input voltage (phase A voltage) to 12 V to output a stabilized DC voltage in order to obtain a stable voltage at a logic level with a low voltage linear regulator.

The first power supply unit 3 operates on a wide range of input voltages of phase voltages 96V to 528V or line voltages 166V to 528V, and the frequencies are 50Hz and 60Hz.

The second power supply unit 4 converts the 12V voltage output from the first power supply unit 3 into a logic voltage of 5V and supplies it to the circuit, and the reference voltage unit 5 receives a 5V voltage as a 2.5V reference voltage. Is supplied to the digital signal processor 14.

The alternating voltage forms the alternating voltages + and-voltages alternately 60 times per minute. Whenever the voltage changes, a time of 0 volts [V] is generated. Since the virtual neutral voltage is required to read all of them, a 2.5V reference voltage is supplied to the digital signal processor 14 for this purpose.

The backup power supply unit 6 uses a lithium battery and the supercapacitor 7 supplies power to the microprocessor 15 using the power supply of the backup power supply unit 6 or the output power of the 5V power supply unit 4, The backup power is also supplied to prevent the RAM data in the microprocessor 15 from being lost.

The digital signal processor 14 receives the necessary clock / sampling signal from the oscillator circuit 20, the microprocessor 15 receives the oscillator circuit 21, and uses a crystal oscillator to provide stable and accurate The oscillation signal of frequency is generated and supplied.

The resistor voltage divider 8 is composed of a linear high resistance voltage divider circuit, which is accurate over a wide range of voltages, and can be applied to a degree of negligible change in accuracy due to voltage variation.

The phase voltage is divided by the resistance divider 8 and input to the digital signal processor 14, and is composed of two high resistances used to lower the phase voltage with low loss, and each resistance path is a low resistance fixed resistance. The resistor is divided appropriately to input the input voltage into the IC circuit of the meter.

All these resistors are metallized resistors with a maximum temperature coefficient of 25 ppm and each resistor has a rated operating voltage of 300 Vrms.

The current sensors 9-13 use a current transformer CT, and the current-limiting resistor for the current flow is a metal film resistor having a maximum temperature coefficient of 25 ppm, to prevent overvoltage loss in the secondary of the current transformer when the primary current flows. In parallel with the current transformer secondary terminals in the sensor (this limits the secondary voltage).

Current values sensed by the current sensors 9-13 are input to the digital signal processor 14, respectively.

The digital signal processor 14 includes three A / D converters and a digital signal processing unit (DSP) for internal configuration. The digital signal processor 14 converts the input voltage and current signals into analog and digital signals, and converts these digitally converted values. Calculate the amount of power using.

The A / D conversion samples the input at a sampling rate of 2.4 kHz on the input, with the resolution of these samples being 21 bits, including the sign bit.

The first A / D converter samples three voltage inputs, the second A / D converter samples three current inputs, and the third A / D converter samples another voltage or current on phase B ( Two-element wattmeters require a B-phase voltage in combination with other phase voltages to generate line voltage).

The DSP performs calculations on this sampled digital value, and the power calculation is determined by the product of the measured voltage and current.

In the present invention, kWH and kW maximum demand power are basically measured. It is also possible to record loads of time-of-use (kWH and kW peak demand), reactive power (kVAh, kVARh + reactive peak demand), bidirectional power measurement and metering data during the entire metering period at 4 rates per day.

On the other hand, the digital signal processor 14 has an electrostatic compensation circuit which flags in response to power loss (related signal PFail (A)).

The calculation result (B phase information, frequency information, power information deletion / recording, etc.) of the digital signal processor 14 is transmitted to the microprocessor 15 (related signals Phase B, 120 Hz (C), Whr Del, Whr Rec, Varh Del, Varh Rec).

The microprocessor 15 performs data processing and communication control.

The microprocessor 15 includes lower functions such as an LCD driving means, a ROM, a RAM, a universal asynchronous transmission and reception means (UART), a timer means, a dual clock input means, and a low power mode.

During normal operation, the microprocessor 15 receives a frequency (4.14 MHz) from the digital signal processor 14, changes to a crystal oscillator 21 that performs low power operation in case of power failure, and maintains time while measuring time during power failure.

The microprocessor 15 displays the accumulated power value on the LCD display unit 16 using the LCD driving means.

The microprocessor 15 also performs communication control, which secures electronic access to the metering information using the optical communication port 19.

The transceiver of the optical communication port 19 is a 850mm infrared sensor, driven by the output from the UART, and is connected to the microprocessor 15 through the receive LED at the optical communication port 21 when the electricity meter is in the test mode. Outputs Wh pulse received by

All important power meters and program data during power failure are stored in EEPROM (17), which is a nonvolatile memory, and the TOU data of the current metering period is stored in RAM in the microprocessor (15), which is the backup power supply (6). It is maintained in real time without being lost even in case of power failure by backup power of.

That is, all the information needed to integrate the maximum demand power or TOU calculation, the instrument constant, total kWh or total energy of VARh or VAh, maximum demand power for TOU, cumulative maximum demand or rate maximum demand power, history of TOU data, The cumulative number of resets of maximum demand power, cumulative number of power failures, and cumulative number of data conversions.

In this way, a single meter detects each of the low voltages and currents for generation N, measures (calculates) the active and reactive powers by the product of the detected voltages and currents, and integrates them over time to measure the measured values. By providing the output pulses for the power generation, each of the power amount for the N generation to store, display, and optical communication output, thereby serving as a multi-generation electronic power metering system.

According to the multi-generation electronic electricity meter of the present invention, it is possible to provide an integrated power metering system by installing one meter in a multi-generation customer of at least two generations or more.

In addition, according to the multi-generation electronic electricity meter, the present invention can achieve the same effect as that of N readings with only one reading during remote reading.

In addition, since the multi-generation electronic electricity meter of the present invention is capable of multi-generation individual power integration / display / metering by installing only one meter, it is easier to secure an installation space than before, and the installation work is convenient. The problem of aesthetics can be solved.

In addition, it can withstand mechanical and electrical performance or error change and weathering performance according to aging change, and can measure precisely over the entire load range used, and can be used as two kinds of instruments.

Claims (1)

An apparatus for supplying power to at least two generations and integrating and measuring and displaying the amount of power used in each generation, A voltage detecting means for detecting a phase voltage of the supplied electric power, a current detecting means configured according to the number of generations N for detecting each phase current supplied with electric power, and the detected voltage and current values as digital signals. Digital signal processing means for converting and calculating power amount information by calculating a digitally converted value, a microprocessor which receives and outputs the output of the digital signal processing means, and processes and stores information for metering power amount for each N generation; LCD display means for displaying processed weighing information, optical communication means for transmitting and receiving weighing information processed in the microprocessor, and non-volatile for providing information / program for detection of the voltage / current and calculation of power amount Storage means and a circuit for supplying a wide range of stabilizing power to each of said circuits and And a reference voltage supply means for receiving a predetermined supply power from a source means and a power supply means to supply a predetermined reference voltage to the digital signal processing means.