CN2254192Y

CN2254192Y - Multifunctional high-precision watt-hour meter

Info

Publication number: CN2254192Y
Application number: CN 95225611
Authority: CN
Inventors: 姜波
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-10-27
Filing date: 1995-10-27
Publication date: 1997-05-14
Anticipated expiration: 2005-10-27

Abstract

The utility model relates to a watt-hour meter, which adopts a singlechip as a core component, and the output end of the watt-hour meter is respectively connected with a display and a functional key through an interface circuit; the parallel input end of the single chip microcomputer is respectively connected with a current converter and a voltage converter through an A/D latch, the current converter is provided with three input terminals a, b and c and output terminals a ', b ' and c ', the input end of the voltage converter is provided with four voltage input terminals Va, Vb, Vc and Vo, the serial input end of the single chip microcomputer is connected with a serial communication interface, a data bus of the single chip microcomputer is respectively connected with a memory and an electric quantity card slot, the electric meter can measure various electric quantities, and three-peak electric charge amount and electricity larceny prevention are achieved.

Description

The multifunction high-precision watt-hour meter

The utility model relates to a kind of watt-hour meter that is used to measure electric weight, particularly can measure multiple electric weight, and is digitized, and has that the electricity charge are advance, the intelligent electric kilsyth basalt of memory function.

Existing watt-hour meter generally only has the function of measuring of single electric weight, and precision is low, function singleness, and easily by stealing.Utilize existing watt-hour meter can't realize three peak electricity consumption rate systems, i.e. the electricity consumption total amount is not only depended in electricity consumption charge, and depends on whether the time of electricity consumption occurs in peak of power consumption.Existing electricity consumption toll administration will drop into a large amount of personnel's counting cost by gas meter, and labour intensity is big.Another shortcoming of existing watt-hour meter does not have anti-stealing electricity function.Therefore, existing watt-hour meter can not satisfy the needs that electric industry department realizes management modernization.

The purpose of this utility model is a kind of high-precision multi-function watt-hour meter of design, the so-called multi-functional measurement that utilizes watt-hour meter not only can finish single electric weight that is meant, and measurement and the metering that can measure multiple electric weight such as active power, reactive power, three peak power, power rate, electric power, each phase current, and have that the electricity charge are advance, the intelligent electric kilsyth basalt of memory function.

The utility model is by following realization:

The utility model is multi-functional, the high precision watt-hour meter comprises single-chip microcomputer 4, keyboard, display interface device circuit 3, display 1, function key 2, A/D latch 9, serial communication interface 10, random access memory 5, ROM (read-only memory) 6, electricity flash memory 7, electric weight card slot 8, three road power packs 11, No. three voltage changers 12, it is characterized in that with as the single-chip microcomputer 4 of data processing as core component, its data output end and keyboard, the input end of display interface device circuit 3 connects, keyboard, the output terminal of display interface device circuit 3 is connected with function key 2 with display 1 respectively; The parallel input end of single-chip microcomputer 4 is connected with the output terminal of A/D latch 9, the input end of A/D latch 9 connects the output terminal of three road power packs 11 and No. three voltage changers 12 respectively, the input end of three road power packs 11 has six current terminal a, b, c and a ', b ', c ', wherein a and a ', b and b ', c and three pairs of current input terminal of c ' formation, the input end of No. three voltage changers 12 has four sub-Va of voltage input end, Vb, Vc and Vo, wherein Va and Vo, Vb and Vo, Vc and Vo constitute three pairs of voltage terminals respectively, the serial input terminal of single-chip microcomputer 4 is connected with serial communication interface 10, the data bus of single-chip microcomputer 4 respectively with random access memory 5, ROM (read-only memory) 6, electricity flash memory 7 is connected with electric weight card slot 8.

Principle of work of the present utility model is as follows:

Sub-a of the current input terminal of power pack and a ' collection user's electric current electric weight, voltage input end of voltage changer is gathered user's correspondent voltage electric weight, electric current electric weight of gathering and voltage electric weight are transformed into digital signal input single-chip microcomputer through the A/D transducer, carry out depositing storer in after the data processing through single-chip microcomputer, under the control of function key, the data that deposit storer in can access on display at any time and show.Three kinds of different storeies of this watt-hour meter have different purposes respectively, random access memory is used to store intermediate data and handles the computing use for single-chip data, the operation result of ROM (read-only memory) storage single-chip microcomputer, be the electric weight of required measurement, electric flash memory is used for the data of the electricity charge of purchasing on the storing electricity card.

The utility model multifunction high-precision watt-hour meter has three kinds of working methods, i.e. three-phase four-wire system, three-phase three-wire system and single-phase three users.In the three-phase four-wire system working method, can be used for measuring the three-phase alternating current power consumption of Y-connection, its rated voltage is 100～400 volts, 0～5 ampere of rated current, measuring accuracy is less than 0.1%; In the three-phase three-wire system working method, can be used for measuring the three-phase alternating current power consumption that triangular form connects, 100～400 volts of its rated voltages, 0～5 ampere of rated current, measuring accuracy is less than 0.1%; In single-phase three user job modes, can measure three users' single-phase AC electric weight simultaneously, 220 volts of rated voltages, 0～5 ampere of rated current, measuring accuracy is less than 0.2%; Watt-hour meter is withstand voltage more than 500 volts.The utility model watt-hour meter can be realized the automatic measurements and calculations electricity charge of three peak electric weight by the three peak tariffss on electricity that power supply department is set, and metering and the numeral that can finish active power, reactive power, power rate, instantaneous electric power, each phase current, voltage simultaneously show.Every data can be done online data and preserve, and do not lose data because of outage.The utility model also has anti-stealing electricity function, and when electricity filching behavior took place, watt-hour meter can be to stealing time and relevant data recorded and stored.

Fig. 1 is a circuit catenation principle structured flowchart of the present utility model;

Fig. 2 is the A/D transducer electrical schematic diagram of an example of the present utility model.

Fig. 3 is the former figure of single-chip microcomputer host circuit electricity of an example of the present utility model.

Fig. 4 is the memory circuitry electrical schematic diagram of an example of the present utility model.

Fig. 5 is the interface circuit electrical schematic diagram of an example of the present utility model.

Fig. 6 is the function key wiring diagram of an example of the present utility model.

Fig. 7 is the display circuit electrical schematic diagram of an example of the present utility model.

Embodiment:

As shown in the figure, the single-chip microcomputer 4 of present embodiment adopts 8098 chips, keyboard, display interface device circuit 3 adopt 8279 chips, random access memory 5 adopts 6264 chips, ROM (read-only memory) adopts 2764 chips, the electricity flash memory adopts 2864 chips, and three road power packs adopt No. three current transformers, and No. three voltage changers adopt No. three voltage transformer (VT).

Claims

1, many merits year the high precision watt-hour meter, comprise single-chip microcomputer [4], keyboard, display interface device circuit [3], display [1], function key [2], A/D latch [9], serial communication interface [10], random access memory [5], ROM (read-only memory) [6], electric flash memory [7], electric weight card slot [8], three road power packs [11], No. three voltage changers [12], it is characterized in that with as data processing single-chip microcomputer [4] as core component, its data output end and keyboard, the input end of display interface device circuit [3] connects, keyboard, the output terminal of display interface device circuit [3] is connected with function key [2] with display [1] respectively; The parallel input end of single-chip microcomputer [4] is connected with the output terminal of A/D latch [9], and the input end of A/D latch [9] connects the output terminal of three road power packs [11] and No. three voltage changers [12] respectively; The input end of three road power packs [11] has six current terminals [a], [b], [b] and [a '], [b '], [c '], wherein [a] and [a '], [b] and [b '], [c] and [c '] constitutes three pairs of current input terminal, the input end of No. three voltage changers 12 has four voltage input end [Va], [Vb], [Vc] and [Vo], wherein [Va] and [Vo], [Vb] and [Vo], [Vc] and [Vo] constitutes three pairs of voltage terminals respectively, the serial input terminal of single-chip microcomputer [4] is connected with serial communication interface [10], the data bus of single-chip microcomputer [4] respectively with random access memory [5], ROM (read-only memory) [6], electricity flash memory [7] is connected with electric weight card slot [8].