CN205450074U - Two meter degree ware three -phase kilowatt -hour meters of two rates of outer accuse - Google Patents
Two meter degree ware three -phase kilowatt -hour meters of two rates of outer accuse Download PDFInfo
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- CN205450074U CN205450074U CN201521087771.5U CN201521087771U CN205450074U CN 205450074 U CN205450074 U CN 205450074U CN 201521087771 U CN201521087771 U CN 201521087771U CN 205450074 U CN205450074 U CN 205450074U
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Abstract
The utility model discloses a two meter degree ware three -phase kilowatt -hour meters of two rates of outer accuse, including the casing, locate central processing unit, pulse output circuit, 3 measurement sampling circuit, rate management circuit, power management chip, memory, first meter degree ware and second meter degree wares in the casing, central processing unit is connected with pulse output circuit, 3 measurement sampling circuit, rate management circuit, power management chip, memory, first meter degree ware and second meter degree ware electricity respectively, it inserts terminal, two and controls terminal and two pulse output terminals outward to be equipped with the three -phase on the casing, the three -phase inserts the terminal to be connected with 3 measurement sampling circuit electricity respectively, and rate management circuit controls outward with two that the terminal is electric to be connected, and pulse output circuit is connected with two pulse output terminals are electric. The utility model has the characteristics of the software and hardware cost has effectively been reduced, simple structure, stable good.
Description
Technical field
This utility model relates to Electric Measurement Technology field, especially relates to the external control double fee rate duplex counter three-phase kilowatt-hour meter of a kind of low cost.
Background technology
Common three-phase kilowatt-hour meter, if double fee rate charging to be realized, needs two register tables to measure simultaneously, or a LCD table realizes turning over screen, the rate electricity of aobvious two screen T1, the T2 of wheel.After showing with LCD table, hardware cost will be greatly promoted, and too increase the difficulty of software design simultaneously.
Chinese patent mandate publication number: CN203949953U, authorize publication date on November 19th, 2014, disclose a kind of ammeter box, including: ammeter box box body and the ammeter chamber door being used in combination with ammeter box box body, described ammeter box box body includes upper side frame, lower frame, left frame and left frame, it is provided with ammeter box snap close on described ammeter box box portion left frame, it is provided with lateral strut on described ammeter box box portion left frame and left frame, bull stick hole is offered on the upper side frame of described ammeter box, the lower frame of described ammeter box is provided with lower bull stick hole, it is provided with ammeter box module in described ammeter box box body.The weak point of this invention is to realize double fee rate charging.
Summary of the invention
Goal of the invention of the present utility model is to overcome the deficiency that three-phase kilowatt-hour meter double rate meter of the prior art is the highest, it is provided that the external control double fee rate duplex counter three-phase kilowatt-hour meter of a kind of low cost.
To achieve these goals, this utility model is by the following technical solutions:
A kind of external control double fee rate duplex counter three-phase kilowatt-hour meter, including housing, the central processing unit being located in housing, impulse output circuit, 3 metering sampling circuits, tariff management circuit, power management chip, memorizer, the first register and the second register；Central processing unit electrically connects with impulse output circuit, 3 metering sampling circuits, tariff management circuit, power management chip, memorizer, the first register and the second register respectively；Housing is provided with three-phase and accesses terminal, two external control terminals and two pulse output terminal；Three-phase accesses terminal and electrically connects with 3 metering sampling circuits respectively, tariff management circuit and two external control terminal electrical connections, impulse output circuit and two pulse output terminal electrical connections.
The single register table (LCD table) realizing double fee rate charging is higher than the hardware cost of duplex counter table, and LCD table is compared with duplex counter table, and the construction cycle is long, and cost is high, and software design is more complicated.
3 metering sampling circuits gather three-phase respectively and access 3 phase voltages and the current signal of the power supply that terminal accesses, 3 metering sampling circuits by the way of pulse with central processing unit communication, metrical pulse by the way of 3 external interrupt rapid pulses punchings to central processing unit.Impulse output circuit, to needing the management that output is gained merit and idle pulse exports.The electricity of the first register display T1 rate；The electricity of the second register display T2 rate.Memorizer includes different types of storage chip, and the data such as electricity, event are stored and managed.Tariff management circuit realizes the control of rate by the method that outside inputs.
This utility model adds 1 register, on the basis of limited lifting cost, achieve the metering of double fee rate, 2 external control terminals are for being connected with civil power 220V, need not RTC chip, central processing unit, by the civil power outside detection, carries out the judgement whether two external control terminals have city to be electrically accessed, can realize the switching of rate.
When having civil power, central processing unit performs the rate of T1, the electricity of the first register display T1 rate；Without civil power, central processing unit performs the rate of T2, the electricity of the second register display T2 rate.
Therefore, this utility model has and effectively reduces hardware and software cost, simple in construction, the feature of good stability.
As preferably, each metering sampling circuit all includes differential voltage signal input circuit, differential current signal input circuit, optical coupling isolation circuit and single-phase measurement chip, the input of differential voltage signal input circuit and differential current signal input circuit all being electrically connected with three-phase incoming end, the input of the outfan of differential voltage signal input circuit, the outfan of differential current signal input circuit and optical coupling isolation circuit all electrically connects with single-phase measurement chip, and the outfan of optical coupling isolation circuit electrically connects with central processing unit.
As preferably, described differential voltage signal input circuit includes resistance R24, resistance R25, resistance R26, resistance R27, resistance R18 and resistance R19, electric capacity C19 and electric capacity C20；Resistance R24 one end ground connection, the resistance R24 other end, resistance R25, resistance R26, resistance R27, resistance R18 and resistance R19 one end are sequentially connected electrically, the resistance R19 other end electrically connects with single-phase measurement chip, electric capacity C19 two ends are in parallel with resistance R18 two ends, and electric capacity C20 two ends are in parallel with resistance R19 two ends.
As preferably, differential current signal input circuit includes resistance R13, resistance R14, resistance R39, resistance R40, electric capacity C17 and electric capacity C18；Resistance R13 and the electrical connection of resistance R14 one end, the resistance R13 other end respectively with resistance R39 one end and be located at three-phase and access the negative electricity of the current transformer in terminal one phase and be connected, resistance R14 other end positive electrical with resistance R40 one end summation current transformer respectively is connected, the resistance R39 other end electrically connects with single-phase measurement chip and electric capacity C18 one end respectively, the resistance R40 other end electrically connects with single-phase measurement chip and electric capacity C17 one end respectively, and the other end of electric capacity C17 and electric capacity C18 all junction points with resistance R13 and resistance R14 electrically connect.
As preferably, optical coupling isolation circuit includes optocoupler OP2, resistance R45, resistance R46, electric capacity C21 and electric capacity C22, and optocoupler OP2 electrically connects with resistance R45, resistance R46, electric capacity C21 and electric capacity C22 respectively.
As preferably, tariff management circuit includes resistance RL1, resistance RL2, resistance RL3, resistance RL4, diode D1 and optical coupling isolation circuit, resistance RL1 one end electrically connects with 1 external control terminal, the resistance RL1 other end, resistance RL2, resistance RL3, resistance RL4 and optical coupling isolation circuit are sequentially connected electrically, the positive pole of diode D1 electrically connects with optical coupling isolation circuit and another external control terminal respectively, and diode D1 negative pole electrically connects with the junction point of resistance RL4 and optical coupling isolation circuit.
Therefore, this utility model has the advantages that and effectively reduces hardware and software cost, simple in construction, good stability.
Accompanying drawing explanation
Fig. 1 is a kind of theory diagram of the present utility model；
Fig. 2 is a kind of circuit diagram of metering sampling circuit of the present utility model；
Fig. 3 is a kind of circuit diagram of central processing unit of the present utility model and two registers；
Fig. 4 is a kind of circuit diagram of tariff management circuit of the present utility model.
In figure: central processing unit 2, impulse output circuit 3, metering sampling circuit 4, tariff management circuit 5, power management chip 6, memorizer the 7, first register the 8, second register 9, three-phase access terminal 10, external control terminal 11, pulse output terminal 12, differential voltage signal input circuit 41, differential current signal input circuit 42, optical coupling isolation circuit 43, single-phase measurement chip 44.
Detailed description of the invention
With detailed description of the invention, this utility model is further described below in conjunction with the accompanying drawings.
If Fig. 1, embodiment as shown in Figure 3 are a kind of external control double fee rate duplex counter three-phase kilowatt-hour meters, including housing, the central processing unit 2 being located in housing, 3,3 metering sampling circuits 4 of impulse output circuit, tariff management circuit 5, power management chip 6, memorizer the 7, first register 8 and the second register 9；Central processing unit electrically connects with impulse output circuit, 3 metering sampling circuits, tariff management circuit, power management chip, memorizer, the first register and the second register respectively；Housing is provided with three-phase and accesses 10, two external control terminals 11 of terminal and two pulse output terminal 12；Three-phase accesses terminal and electrically connects with 3 metering sampling circuits respectively, tariff management circuit and two external control terminal electrical connections, impulse output circuit and two pulse output terminal electrical connections.
As shown in Figure 2, each metering sampling circuit all includes differential voltage signal input circuit 41, differential current signal input circuit 42, optical coupling isolation circuit 43 and single-phase measurement chip 44, the input of differential voltage signal input circuit and differential current signal input circuit all being electrically connected with three-phase incoming end, the input of the outfan of differential voltage signal input circuit, the outfan of differential current signal input circuit and optical coupling isolation circuit all electrically connects with single-phase measurement chip, and the outfan of optical coupling isolation circuit electrically connects with central processing unit.
Differential voltage signal input circuit includes resistance R24, resistance R25, resistance R26, resistance R27, resistance R18 and resistance R19, electric capacity C19 and electric capacity C20；Resistance R24 one end ground connection, the resistance R24 other end, resistance R25, resistance R26, resistance R27, resistance R18 and resistance R19 one end are sequentially connected electrically, the resistance R19 other end electrically connects with single-phase measurement chip, electric capacity C19 two ends are in parallel with resistance R18 two ends, and electric capacity C20 two ends are in parallel with resistance R19 two ends.
Differential current signal input circuit includes resistance R13, resistance R14, resistance R39, resistance R40, electric capacity C17 and electric capacity C18；Resistance R13 and the electrical connection of resistance R14 one end, the resistance R13 other end respectively with resistance R39 one end and be located at three-phase and access the negative electricity of the current transformer in terminal one phase and be connected, resistance R14 other end positive electrical with resistance R40 one end summation current transformer respectively is connected, the resistance R39 other end electrically connects with single-phase measurement chip and electric capacity C18 one end respectively, the resistance R40 other end electrically connects with single-phase measurement chip and electric capacity C17 one end respectively, and the other end of electric capacity C17 and electric capacity C18 all junction points with resistance R13 and resistance R14 electrically connect.
Optical coupling isolation circuit includes optocoupler OP2, resistance R45, resistance R46, electric capacity C21 and electric capacity C22, and optocoupler OP2 electrically connects with resistance R45, resistance R46, electric capacity C21 and electric capacity C22 respectively.
As in figure 2 it is shown, voltage VAP, the VAN of A phase, by resistance R24, the dividing potential drop of R25, R26, R27, R18, R19, input differential signal is to the V2P of single-phase measurement chip U1, V2N pin.The current difference signal IA+, TA-that the sampled signal of current transformer produces, by R39, the dividing potential drop of R40, R13, R14, is input to the V1N of single-phase measurement chip, V1P.Through the internal arithmetic of single-phase measurement chip, produce the pulse of electricity.Pulse signal passes to interrupt pin PCF1 of central processing unit as shown in Figure 3 by CF foot after optocoupler OP1 isolates after being exported.In like manner can realize the signal of B phase to the signal of PCF2, C phase to the conveying of PCF3.
As it is shown on figure 3, PCF1, PCF2, PCF3 is A, the pulse input of B, C three-phase, all receiving three interrupting input mouths of central processing unit, realize the transmission of electric quantity data by the way of interrupting rapid pulse punching, central processing unit exports two registers respectively and drives the pulse signal needed.
As shown in Figure 4, tariff management circuit includes resistance RL1, resistance RL2, resistance RL3, resistance RL4, diode D1 and optical coupling isolation circuit, resistance RL1 one end electrically connects with 1 external control terminal, the resistance RL1 other end, resistance RL2, resistance RL3, resistance RL4 and optical coupling isolation circuit are sequentially connected electrically, the positive pole of diode D1 electrically connects with optical coupling isolation circuit and another external control terminal respectively, and diode D1 negative pole electrically connects with the junction point of resistance RL4 and optical coupling isolation circuit.Instrument is utilized to detect the pulse of two pulse output terminal outputs, so that it is determined that whether the pulse of output meets requirement.
Work process of the present utility model is as follows:
Three-phase accesses terminal and is connected with three phase mains, and 2 external control terminals are for being connected with civil power 220V power supply；When there being 220V civil power to input, to one switching signal of the 2 of ammeter external control terminals, by light-coupled isolation and anti-phase after, to one low level signal RELAY of central processing unit, when central processing unit detects low level, central processing unit performs the rate of T1, and demonstrates the electricity of T1 in the first register；
When inputting without 220V civil power, to one switching signal of the 2 of ammeter external control terminals, by light-coupled isolation and anti-phase after, to one high level signal RELAY of central processing unit, central processing unit performs the rate of T2, demonstrates the electricity of T2 in the second register；It is achieved thereby that the charging of double fee rate.
Should be understood that the present embodiment is merely to illustrate this utility model rather than limits scope of the present utility model.In addition, it is to be understood that after having read the content that this utility model is lectured, this utility model can be made various changes or modifications by those skilled in the art, and these equivalent form of values fall within the application appended claims limited range equally.
Claims (6)
1. an external control double fee rate duplex counter three-phase kilowatt-hour meter, it is characterized in that, including housing, the central processing unit being located in housing (2), impulse output circuit (3), 3 metering sampling circuits (4), tariff management circuit (5), power management chip (6), memorizer (7), the first register (8) and the second register (9)；Central processing unit electrically connects with impulse output circuit, 3 metering sampling circuits, tariff management circuit, power management chip, memorizer, the first register and the second register respectively；Housing is provided with three-phase and accesses terminal (10), two external control terminals (11) and two pulse output terminal (12)；Three-phase accesses terminal and electrically connects with 3 metering sampling circuits respectively, tariff management circuit and two external control terminal electrical connections, impulse output circuit and two pulse output terminal electrical connections.
External control double fee rate duplex counter three-phase kilowatt-hour meter the most according to claim 1, it is characterized in that, each metering sampling circuit all includes differential voltage signal input circuit (41), differential current signal input circuit (42), optical coupling isolation circuit (43) and single-phase measurement chip (44), the input of differential voltage signal input circuit and differential current signal input circuit all being electrically connected with three-phase incoming end, the outfan of differential voltage signal input circuit, the outfan of differential current signal input circuit and the input of optical coupling isolation circuit all electrically connect with single-phase measurement chip, the outfan of optical coupling isolation circuit electrically connects with central processing unit.
External control double fee rate duplex counter three-phase kilowatt-hour meter the most according to claim 2, is characterized in that, described differential voltage signal input circuit includes resistance R24, resistance R25, resistance R26, resistance R27, resistance R18 and resistance R19, electric capacity C19 and electric capacity C20；Resistance R24 one end ground connection, the resistance R24 other end, resistance R25, resistance R26, resistance R27, resistance R18 and resistance R19 one end are sequentially connected electrically, the resistance R19 other end electrically connects with single-phase measurement chip, electric capacity C19 two ends are in parallel with resistance R18 two ends, and electric capacity C20 two ends are in parallel with resistance R19 two ends.
External control double fee rate duplex counter three-phase kilowatt-hour meter the most according to claim 2, is characterized in that, differential current signal input circuit includes resistance R13, resistance R14, resistance R39, resistance R40, electric capacity C17 and electric capacity C18；Resistance R13 and the electrical connection of resistance R14 one end, the resistance R13 other end respectively with resistance R39 one end and be located at three-phase and access the negative electricity of the current transformer in terminal one phase and be connected, resistance R14 other end positive electrical with resistance R40 one end summation current transformer respectively is connected, the resistance R39 other end electrically connects with single-phase measurement chip and electric capacity C18 one end respectively, the resistance R40 other end electrically connects with single-phase measurement chip and electric capacity C17 one end respectively, and the other end of electric capacity C17 and electric capacity C18 all junction points with resistance R13 and resistance R14 electrically connect.
External control double fee rate duplex counter three-phase kilowatt-hour meter the most according to claim 2, it is characterized in that, optical coupling isolation circuit includes optocoupler OP2, resistance R45, resistance R46, electric capacity C21 and electric capacity C22, optocoupler OP2 electrically connect with resistance R45, resistance R46, electric capacity C21 and electric capacity C22 respectively.
6. according to the external control double fee rate duplex counter three-phase kilowatt-hour meter described in claim 1 or 2 or 3 or 4 or 5, it is characterized in that, tariff management circuit includes resistance RL1, resistance RL2, resistance RL3, resistance RL4, diode D1 and optical coupling isolation circuit, resistance RL1 one end electrically connects with 1 external control terminal, the resistance RL1 other end, resistance RL2, resistance RL3, resistance RL4 and optical coupling isolation circuit are sequentially connected electrically, the positive pole of diode D1 electrically connects with optical coupling isolation circuit and another external control terminal respectively, diode D1 negative pole electrically connects with the junction point of resistance RL4 and optical coupling isolation circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521087771.5U CN205450074U (en) | 2015-12-22 | 2015-12-22 | Two meter degree ware three -phase kilowatt -hour meters of two rates of outer accuse |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521087771.5U CN205450074U (en) | 2015-12-22 | 2015-12-22 | Two meter degree ware three -phase kilowatt -hour meters of two rates of outer accuse |
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| CN205450074U true CN205450074U (en) | 2016-08-10 |
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| CN201521087771.5U Active CN205450074U (en) | 2015-12-22 | 2015-12-22 | Two meter degree ware three -phase kilowatt -hour meters of two rates of outer accuse |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633260A (en) * | 2018-12-06 | 2019-04-16 | 国网天津市电力公司 | Twin-core ammeter |
| CN111257608A (en) * | 2020-02-17 | 2020-06-09 | 浙江正泰仪器仪表有限责任公司 | Synchronous processing method of multi-core intelligent electric energy meter and multi-core intelligent electric energy meter |
-
2015
- 2015-12-22 CN CN201521087771.5U patent/CN205450074U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633260A (en) * | 2018-12-06 | 2019-04-16 | 国网天津市电力公司 | Twin-core ammeter |
| CN111257608A (en) * | 2020-02-17 | 2020-06-09 | 浙江正泰仪器仪表有限责任公司 | Synchronous processing method of multi-core intelligent electric energy meter and multi-core intelligent electric energy meter |
| CN111257608B (en) * | 2020-02-17 | 2021-06-22 | 浙江正泰仪器仪表有限责任公司 | Synchronous processing method of multi-core intelligent electric energy meter and multi-core intelligent electric energy meter |
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