CN2140064Y - Magnetic card auto-count liquid crystal indicating watt-hour meter - Google Patents
Magnetic card auto-count liquid crystal indicating watt-hour meter Download PDFInfo
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- CN2140064Y CN2140064Y CN 92232890 CN92232890U CN2140064Y CN 2140064 Y CN2140064 Y CN 2140064Y CN 92232890 CN92232890 CN 92232890 CN 92232890 U CN92232890 U CN 92232890U CN 2140064 Y CN2140064 Y CN 2140064Y
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Abstract
The utility model discloses a magnetic card auto-count liquid crystal indicating watt-hour meter which adopts an 8031 SCM and is matched with a differential amplifier, a full-wave rectifier, a dyadic A/D converter, a liquid crystal indicating drive, and a magnetic card read-in and voltage-stabilizing current circuit. The magnetic card auto-count liquid crystal indicating watt-hour meter can display electric energy, power, voltage, current and the reckoning for remanent power rate, can receive power rate in advance with the magnetic card, etc. The reliability and the precision are higher. The magnetic card auto-count liquid crystal indicating watt-hour meter is an updated product for an existing induction type mechanical watt-hour meter. The requirement of higher electricity application and electricity management can be satisfied.
Description
This practicality newly relates to a kind of electronic installation that is used for the instrumentation power consumption---electronic electric meter.
Watt-hour meter is that electric power is used and the indispensable device in electrical management field, the electric degree of the existing common use of China is the induction type mechanical watt-hour meter, the advantage of this class table is simple in structure, mature production technology, dependable performance, cost are low, and the weak point precision is low, easy to wear, power consumption big, function singleness, no on-line communication function, easily stolen.Along with the electric power application and development, the requirement of electrical management is improved constantly, the traditional electrical kilsyth basalt can not adapt to the development of electric power industry needs gradually, uses modern electronic technology and computer technology, the new electronic electric meter of exploitation, has become inevitable trend.
The purpose of this utility model will be developed a kind of electric work instrumentation that has exactly, multiple functions such as magnetic card prepaid, voltage and current measurement show, the demonstration of residue cable, the novel electron watt-hour meter with higher and reliability.
The electronic electric meter that the utility model proposes is by Watt hour meter shell, display device and the electronic circuit that is contained in the watchcase constitute, electronic circuit is by difference merit amplifier, differential programmable amplifier, accurate full wave rectifier, biproduct part A/D converter, Single Chip Microcomputer (SCM) system, liquid crystal shows driving, magnetic card machine, several parts of magnetic head amplifying circuit and decoding circuit and electric current of voltage regulation constitute, the input end of differential amplifier is connected across on 220 volts of AC power cords through a resistor network, output terminal is connected with the input end of double integration A/D converter through accurate full wave rectifier, the input end of differential programmable amplifier is connected across copper-manganese resistance two ends of contacting mutually with load circuit, output terminal is connected with the output terminal of double integration A/D converter through accurate full wave rectifier, the output terminal of double integration A/D converter is connected with monolithic system, single-chip microcomputer system also with differential programmable amplifier, liquid crystal shows driving circuit, magnetic card machine and magnetic head amplifying circuit and decoding circuit be connected (as shown in Figure 1).
Single Chip Microcomputer (SCM) system by 8031 single-chip microcomputers and storage have electric power to calculate program, read magnetic card program and software filtering, the memory chip of verification, error correction, self-check program constitutes (as shown in Figure 2).
Differential amplifier by operational amplifier IC1:A, IC1:B, and IC1:C constitute, the in-phase input end of IC1:A and IC1:B is connected with the Y output terminal of a single-pole double-throw (SPDT) electronics simulation switch I C6-1, the output terminal one tunnel of IC1:C is connected on the X2, X3 end of IC7 through IC1:D, another road is connected with the YO input end of single-pole double-throw (SPDT) electronics simulation switch I C5, the Y0 of IC6-1, Y1 input end are via resistance R 33-R37, and the resistor network of composition is connected on 220 volts of alternating current circuits.Differential programmable amplifier is made of operational amplifier IC2:A, IC2:B, IC2:C, IC2:D and 1/2IC5, the in-phase input end of IC2:A is connected with the Z output terminal of IC6-1, the in-phase input end of IC2:A is connected with the Z output terminal of IC6-1, the in-phase input end of IC2:B be connected with copper-manganese resistance R 38 (R38=4 milliohm), the output terminal of IC2:C and IC2:D is connected with Z1 and the Z0 input end of IC5 respectively, and the B port of IC5 and C port are connected with the P1.4 and the P1.3 port of 8031 single-chip microcomputers respectively.Biproduct somatotype A/D converter is made of the big device IC3:A of computing, IC3:B and electronics simulation switch I C7, the output terminal of IC3:A and the in-phase input end of IC3:B are connected with Y output terminal Y2, the Y3 input end of IC7, the Y1 input end of IC7 is connected with the diode D2 of accurate full wave rectifier, the X output terminal of IC7 and through diode D4, operational amplifier IC3:C and diode D6 are connected to the INT1 port of 8031 single-chip microcomputers, and the A of IC7 and B port are connected with the P1.5 and the P1.6 port of 8031 single-chip microcomputers respectively.Magnetic head amplifying circuit and decoding circuit are made of operational amplifier IC4:B, IC4:A and IC3:C, the in-phase input end of IC4:B is connected from T with magnetic head, the output terminal of IC4:A and diode D3 are connected to the in-phase input end of IC3:C, and IC3:C output terminal and diode D9 are connected to the INT1 port of 8031 single-chip microcomputers.Liquid crystal display drive circuit is made of IC15, IC11, LCD charactron and diode D11-D17, the D0-D7 port of IC15 is connected with the P00-P07 port of the D0-D7 port of storaging chip IC10, single-chip microcomputer 8031, the Q0-Q7 port of IC15 is connected with the LCD charactron, and the Q0-Q6 terminal of charactron is connected to the P27 port of 8031 monolithics through two pipe D11-D17, IC11-6.
The principle of work of this electronic electric meter is such: to measuring partly, for guaranteeing precision, reduce nonlinearity erron, adopt the resistor network dividing potential drop to survey voltage, survey the method for electric current with the pressure drop of flowing through the ohmically electric current generation of copper-manganese, after differential amplifier amplifies, divide two-way, the one tunnel is used for producing the square wave identical with the AC network cycle, goes the counting input of single-chip microcomputer, calculating the phase differential of voltage and electric current, is power factor thereby obtain cos φ.Another road is after the rectification of precision all-wave attitude stream device, send micro-processor controlled variable cycle double integration A/D converter to carry out the A/D conversion, its result (the binary digit amount of the mean value of voltage, electric current), after calculating its effective value by software again, just can obtain instantaneous power P, then by formula W by fraction P=UICOS φ
The discrete form W=∑ P Δ t of dt calculates electric energy W, can find out from the instrumentation process of this W, measures W, can find out that from the instrumentation process of this W other is worth and measures when measuring W, as U, ICOS φ, P, these values are all imitated in the internal memory of single-chip microcomputer, can send demonstration at any time.Display mode adopts liquid crystal technology, digital mode shows, for showing multiple information at same liquid crystal display, finish the demonstration of various information with switching mode by software, as electric energy, electric power, voltage, the surplus Alternation Display of doing the electricity charge etc., magnetic card read-write counting mechanism adopts fixed head, manually inserts the magnetic card read-write, on signal numbering modulation system, eliminate the read-write mistake that causes because of insertion speed is inhomogeneous on the decoding processing method, after reading, the amount of money number of the electricity charge leaves in the microcomputer memory, every kilowatt-hour of having used can deduct the electricity charge once automatically, the magnetic card amount of money is repeated to use in order only to remove, and when magnetic card is drawn out of, has just erased all amount of money on the magnetic card.
From top description as can be seen, magnetic card type is counted the liquid crystal display watt-hour meter automatically owing to adopted modern electronic technology and computer technology, can be with the various parameters that record and deposit data demonstration at any time the internal memory of Single Chip Microcomputer (SCM) system of reading in from magnetic card, realized multi-functionally,, reduced power consumption greatly at circuit, reduce device heat, in measurement and computing supervisor, adopt software filtering, technology such as veritification, error correction, self check, thus make whole attitude machine obtain higher degree of accuracy and reliability.
An embodiment of the present utility model, circuit do one below in conjunction with circuit diagram to the course of work of complete machine and describe in detail as shown in Figure 2, for simplicity, are divided into measurement, demonstration, magnetic card prepaid three parts and illustrate respectively.One, measure portion: (1) surveys voltage, to the interchange stream voltage of the 220V at load two ends behind electric resistance partial pressure, after delivering to the differential amplifier that constitutes by 3/4IC1 and amplifying by proper proportion, single-pole double-throw (SPDT) electronic analog swtich (this switch is surveyed voltage or electric current in order to switch) by the 1/2IC5 formation, deliver to the precision rectifer that constitutes by 1/4IC3 and D1, D2 again, convert AC signal to dc pulse signal.Then, deliver to this signal by 1/2IC3, IC7 and microcomputer constitutes and biproduct somatotype A/D converter by software control, carry out mould/number conversion.Single chip microcomputer before each conversion, survey the cycle of AC network this moment earlier, and with cycle of measuring as integral time.The biproduct single chip microcomputer is according to formula U like this
Have≈ 1.11U
Flat, the effective value U that calculates alternating voltage has, and leaves in the single-chip microcomputer internal memory with binary form.(2) survey electric current, copper-manganese resistance by the milliohm level of string in load circuit, after voltage drop by surveying its two ends, the program control differential amplifier that constitutes via IC2 and 1/2IC5 amplify, after the program control differential amplifier amplification by the 1/2IC5 formation, by the electronic switch that 1/2IC5 constitutes, deliver to aforesaid accurate full wave rectifier, the whole process of back is similar with survey voltage, current value result with after the also conversion that measures leaves in the internal memory with two forms of making.(3) with the voltage in the internal memory, the current value single chip microcomputer carries out the multiplying of P=UI, and its result is exactly the instantaneous power value.(4) according to formula W
Dt carries out integral operation, and what carry out on single chip microcomputer is cumulative process, i.e. W=W=∑ P Δ t=1 second.Above result of calculation P, W value all leave in the internal memory, whenever add up once, judge whether W was once expiring or 1 kilowatt/hour, and be whenever full once just from depositing with the internal memory of electric degree, once deducts.
Two, display part
Above measurement result all by by IC15,4/7IC12 and seven sections dynamic scan display parts that the LCD charactron constitutes, shows.Owing to have only one group of charactron, therefore, can only show a kind ofly at any one time, so adopt SE Shang ECT key to select show state, that chooses is indicated by the D12-D17 light emitting diode.The show state of this machine design acquiescence is the electric degree value, and other option automatically returns to default conditions after choosing seven seconds.
Three, this part of magnetic card prepaid part is by magnetic head MT, IC4 and single chip microcomputer structure, magnetic card during insertion because the relative magnetic head motion of magnetic card.The magnetization coded message of record on magnetic card read by magnetic head,, convert square wave to through 1/4IC again because of amplifying through the IC4 two-stage a little less than the signal, by microcomputer the pulsewidth of this square wave is measured, thereby obtained binary data, some is a password in these data, to prevent forging repeated use.Some is the electric degree data of purchase, and microcomputer is added in the internal memory of depositing the electric degree value judging that password will obtain the electric degree value after correct, has promptly finished the read-in process of data on magnetic card.
Fig. 1 is the former logical schematic of circuit of the present utility model.
Fig. 2 is a circuit diagram of the present utility model.
Claims (7)
1, a kind of magnetic card type is counted the liquid crystal display watt-hour meter automatically, by Watt hour meter shell, display device and the electronic circuit that is contained in the watchcase constitute, it is characterized in that: electronic circuit is by difference merit amplifier, differential programmable amplifier, accurate full wave rectifier, double integration A/D converter, Single Chip Microcomputer (SCM) system, liquid crystal display drives, magnetic card machine, several parts of magnetic head amplifying circuit and decoding circuit and stabilized voltage supply constitute, the input end of differential amplifier is connected across on 220 volts of AC power cords through a resistor network, output terminal is connected with the input end of double integration A/D converter through accurate full wave rectifier, the input end of differential programmable amplifier is connected across copper-manganese resistance two ends of contacting mutually with load circuit, output terminal is connected with the input end of double integration A/D converter through accurate full wave rectifier, the output terminal of double integration A/D converter is connected with monolithic system, Single Chip Microcomputer (SCM) system also with differential programmable amplifier, liquid crystal shows driving circuit, magnetic card machine and magnetic head amplifying circuit and decoding circuit are connected.
2, watt-hour meter according to claim 1 is characterized in that: Single Chip Microcomputer (SCM) system by 8031 single-chip microcomputers and storage have electric power to calculate program, read magnetic card program and software filtering, the memory chip of verification, error correction, self-check program constitutes.
3, watt-hour meter according to claim 1, it is characterized in that: differential amplifier by operational amplifier IC1:A, IC1:B, and IC1:C constitute, the in-phase input end of IC1:A and IC1:B is connected with the Y output terminal of a single-pole double-throw (SPDT) electronics simulation switch I C6-1, the output terminal one tunnel of IC1:C is connected on the X2, X3 end of IC7 through IC1:D, another road is connected with the YO input end that hilted broadsword is thrown bielectron simulation switch I C5, the Y0 of IC6-1, Y1 input end are via resistance R 33-R37, and the resistor network of composition is connected on 220 volts of alternating current circuits.
4, according to claim 1,2 described watt-hour meter, it is characterized in that: differential programmable amplifier is made of operational amplifier IC2:A, IC2:B, IC2:C, IC2:D and 1/2IC5, the in-phase input end of IC2:A is connected with the Z output terminal of IC6-1, the in-phase input end of IC2:B is connected with copper-manganese resistance R 38, the output terminal of IC2:C and IC2:D is connected with Z1 and the Z0 input end of IC5 respectively, and B end and the C port of IC5 are connected with the P1.4 and the P1.3 port of 8031 single-chip microcomputers respectively.
5, according to claim 1,2 described watt-hour meter, it is characterized in that: biproduct somatotype A/D converter is by operational amplifier IC3:A, IC3:B and electronics simulation switch I C7 constitute, the Y output terminal Y2 of the output terminal of IC3:A and the in-phase input end of IC3:B and IC7, the Y3 input end is connected, the Y1 input end of IC7 is connected with the diode D2 of accurate full wave rectifier, the X output terminal of IC7 and through diode D4, operational amplifier IC3:C and diode D6 are connected to the INT1 port of 8031 single-chip microcomputers, and the A of IC7 and B port are connected with the P1.5 and the P1.6 port of 8031 single-chip microcomputers respectively.
6, according to claim 1,2 described watt-hour meter: its feature in: magnetic head amplifying circuit and decoding circuit are made of operational amplifier IC4:B, IC4:A and IC3:C, the in-phase input end of IC4:B is connected from T with magnetic head, the output terminal of IC4:A and diode D3 are connected to the in-phase input end of IC3:C, and IC3:C output terminal and diode D9 are connected to the INT1 port of 8031 single-chip microcomputers.
7, according to claim 1,2 described watt-hour meter: it is characterized in that: liquid crystal display drive circuit is made of IC15, IC11, LCD charactron and diode D11-D17, the D0-D7 port of IC15 and the D0-D7 port of storaging chip IC10, the P00-P07 port of single-chip microcomputer 8031 is connected, the Q0-Q7 port of IC15 is connected with the LCD charactron, and the Q0-Q6 terminal of charactron is connected to the P27 port of 8031 monolithics through two pipe D11-D17, IC11-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92232890 CN2140064Y (en) | 1992-09-03 | 1992-09-03 | Magnetic card auto-count liquid crystal indicating watt-hour meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92232890 CN2140064Y (en) | 1992-09-03 | 1992-09-03 | Magnetic card auto-count liquid crystal indicating watt-hour meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2140064Y true CN2140064Y (en) | 1993-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92232890 Expired - Fee Related CN2140064Y (en) | 1992-09-03 | 1992-09-03 | Magnetic card auto-count liquid crystal indicating watt-hour meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2140064Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094964A (en) * | 2016-08-19 | 2016-11-09 | 天津市百利电气有限公司 | There is the microprocessor of electric energy sampling differential amplifier circuit |
-
1992
- 1992-09-03 CN CN 92232890 patent/CN2140064Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094964A (en) * | 2016-08-19 | 2016-11-09 | 天津市百利电气有限公司 | There is the microprocessor of electric energy sampling differential amplifier circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |