CN201355376Y

CN201355376Y - Ultra-wide range single-phase multi-rate watt-hour meter

Info

Publication number: CN201355376Y
Application number: CNU2009200792575U
Authority: CN
Inventors: 李志双; 姜君
Original assignee: Sichuan Aostar Shuda Electric Co Ltd
Current assignee: Sichuan Aostar Shuda Electric Co Ltd
Priority date: 2009-02-27
Filing date: 2009-02-27
Publication date: 2009-12-02
Anticipated expiration: 2019-02-27

Abstract

The utility model provides an ultra-wide range single-phase multi-rate watt-hour meter, comprising a data memory circuit, a pulse output circuit, a RS485 communication circuit, an infrared communication circuit, an LCD display, a current sampling circuit, a voltage sampling circuit, a power system and a monitoring circuit. The watt-hour meter is characterized in that the watt-hour meter also comprises an integrated circuit SOC chip U1 which integrates a measurement and control singlechip, a real-time clock, an LCD driver and a temperature sensor into a whole. The ultra-wide range single-phase multi-rate watt-hour meter has the advantages of using little chips, high integration, simple circuit, higher production efficiency, better error performance, and being capable of reducing cost greatly.

Description

The single-phase multi-rate electric energy meter of super wide-range

Technical field:

The utility model is relevant with electric energy meter, and is relevant with the single-phase multi-rate electric energy meter of super wide-range that adopts the SOC chip especially.

Background technology:

Single-phase multiple rate active electric energy meter is the widely used a kind of electric energy meter of power department, is used for the metering at times to domestic consumer's power consumption.Current high development of social economy makes the power consumption of family and enterprise increasing, thereby requires also increasing to the measurement range of electric energy meter meter.Present electric energy meter is 4 times of journey tables mostly, and promptly the fundamental measurement scope of electric current is Ib, and maximum measurement range is 4Ib.4 times of journey tables are that the measuring error of load current during less than 0.1Ib (or 0.05In) is more much bigger than grade of meter error in light condition.With 1.0 grades of tables is example, and the grade error criterion of 1.0 grades of tables is 1.0%, and the error when light condition can reach 1.5%.Power department is often selected the bigger electric energy meter of Ib in order to satisfy wide-measuring range, but such selection makes the inaccurate gage work section of electric energy meter and uncertain metering zone segment limit also bigger.Owing to the use of a large amount of modernized energy-saving electric appliances, the electricity consumption of family and enterprise often most time is in little electric current, light condition, will cause electric energy meter inaccurate in most of time measurements so at present.

Super wide-range electric energy meter, when the fundamental measurement scope of electric current is Ib, maximum measurement range can reach 20～40Ib, compare with 4 times of journey tables, when maximum measurement range is identical, fundamental measurement scope Ib only is 1/5～1/10 of 4 times of journey tables, and so inaccurate gage work section and uncertain metering zone segment limit also only are 1/5～1/10 of 4 times of journey tables, like this with regard to the good inaccurate problem of metering that has solved under little electric current, the light condition.Because times journey of electric energy meter is very wide, can accurately measure big dynamic impact load simultaneously, effectively reduce the line loss of electrical network, make it more can adapt to the development of modern society.Aspect in addition, also having solved as the user increases consumer, and maximum load current can surpass the problem of the maximum current of electric energy meter, can avoid because of changing the waste that bigger current specification ammeter is caused.

Single-phase many rates active electric energy meter (the comprising the wide-range electric energy meter) hardware that uses at present mainly is made up of three parts: with the metering circuit part of computation chip as the center; With peripheral circuits such as single-chip microcomputer, storer and real-time clock (RTC), LCD driving, LCD demonstration, Communication Control is the control circuit part at center; With the power circuit part.Because the chip that uses is too many, integrated level is not high, and the circuit complexity has increased the difficulty of producing; Cost height particularly, the design cycle is long, is unfavorable for market competition, also increases burden to the user.

The utility model content:

The purpose of this utility model is in order to overcome above deficiency, to provide a kind of use chip few, the integrated level height, and circuit is simple, and production efficiency is higher, and error performance is better, the single-phase multiple rate electronic watch of the super wide-range that can reduce cost significantly.

The purpose of this utility model is achieved like this:

The single-phase multi-rate electric energy meter of the super wide-range of the utility model, comprise the data storing circuit, impulse output circuit, the RS485 communicating circuit, the infrared communication circuit, LCD display, current sampling circuit, voltage sample circuit, power-supply system and supervisory circuit, its feature also comprises the collection metering, control single chip computer, real-time real clock, LCD driving and temperature sensor are in the integrated circuit SOC of one chip U1, data storage circuitry passes through WPSCL, the SDA pin respectively with the P1.4 of U1, P1.5, the P1.6 mouth connects, impulse output circuit is connected with the P0.2 mouth of U1 by SE COND pin, the RS485 communicating circuit passes through RXD, the P1.0 of TXD pin and U1, the P1.1 mouth connects, the infrared communication circuit passes through RXD, the P1.0 of TXD pin and U1, P1.1, the P0.7 pin connects, LCD display is passed through COMO-COM3, the S0-S13 pin respectively with liquid crystal control pin SOM0～COM3 of U1, the S0-S13 pin connects, current sampling circuit passes through Ip, the In pin respectively with the Ip of U1, the In pin connects, voltage sample circuit is connected with the VP pin of U1 by VP, power-supply system and supervisory circuit are signal and provide power supply for the RS485 communicating circuit for U1 provides power supply and current monitoring, current signal is handled by the current transformer sample circuit, voltage signal is handled by voltage sample circuit, the SOC chip is finished the sampling to current signal and voltage signal, the electrical energy parameter metering, provide ammeter to carry out time source and LCD demonstration control that the multiple rate of electric weight is calculated, and finish the operation of electric energy meter Control Software, and carry out communication and exchanges data with external unit and other device; Power-supply system and supervisory circuit provide meter circuit required direct supply; RS485 communicating circuit and infrared communication circuit are in order to realize electric energy meter and outside data communication, and it provides infrared-ray communication and RS485 mouth communication dual mode; Data storage circuitry is the place of the storage of computational data; Impulse output circuit outwards provides calibration electrical energy pulse signal.

The model of above-mentioned integrated circuit SOC chip U1 is ADE7566, the FLASH program space of 16K, and 512byteRAM, operating voltage 2.4V～3.6V, integrating metrology, RTC, LCD drive and are one.Two kernels are arranged in the ADE7566, and one is DSP metering kernel, and one is the MCU kernel.DSP metering kernel has calculated electric weight by interrupting giving MCU, and MCU receives the laggard line data of data and handles.This chip provides reserce cell and working power seamless switching.The ferroelectric memory FM24LC04 of Ramtron.Operating voltage 2.7V～3.6V, and the read-write number of times almost be unlimited, be 10,000,000,000 hundred million times.Have the advantage of SRAM and EEPROM concurrently.It provides the storage space of electric quantity data and ammeter configuration data.Its maximum characteristic is that data are protected without battery after the power down.

The single-phase multiple rate active electric energy meter of the utility model is mainly finished single-phase user's meritorious power consumption metering, and have functions such as time-sharing measurement, demonstration, communication, storage, clock, and the work of most critical to be super wide-range accurately measure, the dynamic range of chip metering has determined the magnitude range of input signal and the accurate scope of metering.The input signal of meritorious power consumption metering is voltage signal u and the current signal i that enters the user, electric energy meter is nursed one's health input signal by signal conditioning circuit, make it to convert to the form of SOC chip requirement, deliver to the SOC chip then and finish sampling current signal and voltage signal, the electrical energy parameter metering, the result of metering is the active energy of time-sharing measurement, voltage, electric current, frequency, power factor, parameters such as active power, the SOC chip is at data storage circuitry simultaneously, LCD display, finish the operation of electric energy meter Control Software under the support of infrared and RS485 communicating circuit etc., show, communication, functions such as storage.

The single-phase multi-rate electric energy meter of the super wide-range of the utility model has adopted the SOC chip, promptly used the high integration integrated circuit (IC) chip that integrates metering, control single chip computer, real-time clock (RTC), LCD driving and temperature sensor, only need be equipped with a small amount of peripheral circuit such as storer, LCD demonstration, Communication Control, add that power circuit gets final product the perfect electric energy meter of composition function, and realized super wide-range (20～40 times of journeys).The chip of Shi Yonging is few like this, the integrated level height, and circuit is simple, and convenient for production, efficient is higher (can realize the software calibration), error performance better (can realize stepless calibrating for error), particularly cost reduces significantly, and the design cycle is short, helps market competition, has also reduced burden for users.

Description of drawings:

Fig. 1 is the utility model circuit block diagram.

Fig. 2 is power system circuit figure.

Fig. 3 is the power supply supervisory circuit schematic diagram.

Fig. 4 is the data storage circuitry schematic diagram.

Fig. 5 is the impulse output circuit schematic diagram.

Fig. 6 is a RS485 communicating circuit schematic diagram.

Fig. 7 is the infrared communication circuit diagram.

Fig. 8 is the display circuit schematic diagram.

Fig. 9 is the current sampling circuit schematic diagram.

Figure 10 is the voltage sample circuit schematic diagram.

Figure 11 is a SOC chip circuit schematic diagram.

Figure 12 is the battery circuit schematic diagram.

Embodiment:

Referring to Fig. 1～Figure 12, the single-phase multi-rate electric energy meter of the super wide-range of present embodiment comprises battery circuit, the data storing circuit

Impulse output circuit, the RS485 communicating circuit, the infrared communication circuit, LCD display, current sampling circuit, cell voltage sample circuit, power-supply system and supervisory circuit, model are the integrated circuit SOC chip U1 that integrates metering, control single chip computer, real-time real clock, LCD driving and temperature sensor of ADE7566.Battery circuit connects the VBAT function pin of 58 pin of U1 by VBAT.Data storage circuitry is connected with 1.6 mouthfuls with P1.4, the P1.5 of U1 respectively with the SDA pin by WPSCL.Impulse output circuit is connected with the P0.2 mouth of U1 by SE COND pin.The RS485 communicating circuit is connected with the P1.1 mouth with the P1.0 of U1 with the TXD pin by RXD.The infrared communication circuit is connected with P1.1, P0.7 pin with the P1.0 of U1 with the TXD pin by RXD.LCD display is connected with liquid crystal control pin SOM0～COM3, the S0-S13 pin of U1 respectively by COMO-COM3, S0-S13 pin.Current sampling circuit is connected with the In pin with the Ip of U1 respectively with the In pin by Ip.Voltage sample circuit is connected with the VP pin of U1 by VP.Power-supply system and supervisory circuit are signal and provide power supply for the RS485 communicating circuit for U1 provides power supply and current monitoring.

It is the installing type electronic electric energy meter that is used for the resident that the utility model adopts the single-phase multiple rate active electric energy meter of the super wide-range of SOC chip, but the meritorious electric weight of time-sharing measurement residential electricity consumption.

Main feature:

● 1.0 grades of the meritorious degrees of accuracy;

● reference voltage: 220v;

● electric current fundamental measurement scope (Ib): 1.5A, 2.5A etc.;

● maximum measurement category (Imax): the 20 ~ 40Ib of electric current;

● reference frequency: 50Hz;

But ● the accurate-metering impact load;

But ● measuring voltage, electric current, frequency, power factor, active power;

● four rates, there are 10 " point ", " peak ", " putting down ", " paddy " periods that are provided with arbitrarily in one day;

● store the current moon, last month, the month before last electric quantity data;

● meet DL/T645-1997 " multifunctional electric energy meter communication protocol ";

● security function, 3 grades of cryptoguards are arranged, 2 grades of passwords use for inner;

● timing error limit requirement ± 0.5s/d;

● performance meets GB/T17215-2002 " 1 exchange active electric energy meter with 2 grades of state types ";

● other requirements meet the related request of GB/T15284-2002 " multi-rate electric energy meter specific (special) requirements ";

● adopt the software calibration, convenient for production, efficient is higher;

● error performance better (the software calibration can realize stepless calibrating for error, and adopts the SOC technology to make the ammeter dynamic range can reach 1000: 1, and the traditional single phase multi-rate electric energy meter has only 500: 1);

● cost is lower.

Claims

1, the single-phase multi-rate electric energy meter of super wide-range, comprise the data storing circuit, impulse output circuit, the RS485 communicating circuit, the infrared communication circuit, LCD display, current sampling circuit, voltage sample circuit, power-supply system and supervisory circuit, it is characterized in that also comprising the collection metering, control single chip computer, real-time real clock, LCD driving and temperature sensor are in the integrated circuit SOC of one chip U1, data storage circuitry passes through WPSCL, the SDA pin respectively with the P1.4 of U1, P1.5, the P1.6 mouth connects, impulse output circuit is connected with the P0.2 mouth of U1 by SE COND pin, the RS485 communicating circuit passes through RXD, the P1.0 of TXD pin and U1, the P1.1 mouth connects, the infrared communication circuit passes through RXD, the P1.0 of TXD pin and U1, P1.1, the P0.7 pin connects, LCD display is passed through COM0-COM3, the S0-S13 pin respectively with liquid crystal control pin SOM0～COM3 of U1, the S0-S13 pin connects, current sampling circuit passes through Ip, the In pin respectively with the Ip of U1, the In pin connects, voltage sample circuit is connected with the VP pin of U1 by VP, and power-supply system and supervisory circuit are signal and provide power supply for the RS485 communicating circuit for U1 provides power supply and current monitoring.

2, the single-phase multi-rate electric energy meter of super wide-range as claimed in claim 1 is characterized in that the model of integrated circuit SOC chip U1 is ADE7566.