CN2385336Y

CN2385336Y - Wide-range electronic kilo-watt-hour meter

Info

Publication number: CN2385336Y
Application number: CN 99228648
Authority: CN
Inventors: 刘建华
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-06-18
Filing date: 1999-06-18
Publication date: 2000-06-28
Anticipated expiration: 2009-06-18

Abstract

The utility model relates to a kilo-watt-hour meter, particularly a wide-range electronic kilo-watt-hour meter. The utility model mainly adopts a single-chip microcomputer with an A/D converter and an LCD driver to receive voltage and current signals for A/D conversion, the signals are converted into digital values, multiplied and then integrated with the time, and then the electricity amount data is output to an LCD, a memory, a carrier wave module for displaying, storing and automatic reading. The utility model has the advantages of wide metering range, integration, low cost, low failure rate, simultaneous realization of LCD displaying, carrier wave communication and storage and accurate metering.

Description

A kind of wide range electron ammeter

The utility model relates to a kind of ammeter, particularly a kind of electronic electricity meter of wide-range.

Before the utility model is not invented, for ammeter, developed to electronic electricity meter from mechanical ammeter, electronic electricity meter has solved defectives such as mechanical ammeter low precision, rotational cycle weak point, uses so obtain popularizing.But this electronic electricity meter also exists major defect.At first, China's resident's household electricity shows the peak power consumption and the gap of power consumption is increasing at ordinary times, that is to say that the ratio of maximum current and fundamental current is increasing.They are two years old, country is progressively requiring new clothes ammeter user to dispose the ammeter of 7-20KW, be each household minimal configuration 30A, maximum configured 90A, as user to 20KW, just need to install the ammeter of 20 (80) A by the range of present ammeter, and this ammeter is during to the underload electricity consumption, its electricity consumption metering will be inaccurate.They are three years old, the output of this electronic electricity meter is pulse, usually all be to show power consumption with mechanical character wheel indication device, and this mechanical indication device very easily is out of order, and along with long more easy more being out of order of time, can occur counting less electricity consumption after particularly breaking down, cause damage or cause dispute for power supply enterprise and user to power supply enterprise.Its four, if realize automatic data logging, such electronic electricity meter do not have this may, will install single-chip microcomputer, carrier communication circuit additional, so will increase cost, raise failure rate, and can't be integrated.

The purpose of this utility model just is to overcome above-mentioned defective, designs a kind of electronic electricity meter of wide-range.

The technical solution of the utility model: bleeder circuit, sample circuit and amplifying circuit are arranged, and its major technique feature is the input end that bleeder circuit, sample circuit and amplifying circuit are connected to single-chip microcomputer respectively, and the output terminal of single-chip microcomputer connects LCD.

Single-chip microcomputer is a kind of single-chip microcomputer with A/D conversion, liquid crystal drive.

Advantage of the present utility model and effect are wide-range, and promptly minimum current can reach more than 8 times with the ratio of maximum current, just reach 16 times as 5 (80) A, and liquid crystal display, storage, carrier communication are integrated, and metering accurately, failure rate is low, cost is low.

Accompanying drawing:

Fig. 1--electronic technology principle schematic of the present utility model.

Fig. 2--the utility model external form synoptic diagram.

Embodiment:

As shown in Figure 1: extraction voltage is connected to A2, the A3 input end of single-chip microcomputer 2 through bleeder circuit 1 dividing potential drop on live wire, the ground wire, and single-chip microcomputer 2 becomes corresponding digital quantity with this voltage signal by the A/D analog to digital conversion; Take out current signal from sample resistance 3 two ends and send into amplifying circuit 4, after amplifying, amplifying circuit 4 is connected to the A1 input end of single-chip microcomputer 2, single-chip microcomputer 2 converts this analog quantity to digital quantity, if this digital quantity is outside the A/D conversion range on the single-chip microcomputer 2, then single-chip microcomputer 2 is by the switching of its OUT end control electronic switch 5, because electronic switch 5 is attempted by the two ends of amplifying circuit 4, thereby change the enlargement factor of amplifying circuit 4, make it to enter the A1 end signal of single-chip microcomputer 2 within the A/D conversion range.When voltage, current signal after single-chip microcomputer 2 internal conversions become digital quantity, after then single-chip microcomputer 2 carries out product with the digital quantity of voltage, electric current, again its product and time are carried out integration.The electric quantity data that calculates is exported to memory 6, simultaneously electric quantity data is exported to LCD 7 and show.Realize automatic meter-reading if desired, electric quantity data can be exported to carrier module 8, electric quantity data is delivered to the calculating that power supply enterprise carries out electricity cost.

If in actual use, LCD 7 breaks down, can't video data, then, can not lose because data have been stored in the memory 6, and miscalculation or dispute also just can not appear.

As shown in Figure 2: be the utility model of making according to the electronic circuit of Fig. 1.

Claims

1. a wide range electron ammeter has bleeder circuit, sample circuit and amplifying circuit, it is characterized in that bleeder circuit, sample circuit and amplifying circuit are connected to the input end of single-chip microcomputer respectively, and the output terminal of single-chip microcomputer connects LCD.

2. wide range electron ammeter according to claim 1 is characterized in that single-chip microcomputer is a kind of single-chip microcomputer with A/D conversion, liquid crystal drive.

3. wide range electron ammeter according to claim 1 is characterized in that an electronic switch is set between amplifying circuit and single-chip microcomputer, and electronic switch is attempted by on the amplifying circuit, and its control end is connected on the end of single-chip microcomputer.

4. wide range electron ammeter according to claim 1 is characterized in that the output terminal of single-chip microcomputer connects memory.

5. wide range electron ammeter according to claim 1 is characterized in that the output terminal of single-chip microcomputer connects carrier module.