CN204188705U - A kind of Multifunctional electronic electric energy meter - Google Patents
A kind of Multifunctional electronic electric energy meter Download PDFInfo
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- CN204188705U CN204188705U CN201420584978.2U CN201420584978U CN204188705U CN 204188705 U CN204188705 U CN 204188705U CN 201420584978 U CN201420584978 U CN 201420584978U CN 204188705 U CN204188705 U CN 204188705U
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Abstract
The utility model discloses a kind of Multifunctional electronic electric energy meter, comprise electric current and voltage sample circuit, electric energy computation chip group circuit (20), main control chip (30), real-time clock (31), watchdog circuit (32), storer (33), communication module, keyboard (35), light-emitting diode display (36), power module (40), described electric current and voltage sample circuit is connected with electric energy computation chip group circuit (20), described electric energy computation chip group circuit (20) is connected with main control chip (30) by synchronous serial Peripheral Interface, described real-time clock (31), watchdog circuit (32), storer (33), communication module, keyboard (35), light-emitting diode display (36) is connected with main control chip (30) respectively.The utility model can measure the various information of electric energy easily, and realizes telecommunication and complete the work of checking meter and realize Distributing Network Automation.
Description
Technical field:
The utility model relates to Electric Energy Metering Technology, in particular to a kind of Multifunctional electronic electric energy meter.
Background technology:
Electric energy is the most important energy, in modern society electric energy oneself be widely applied to the every field of social production and the various aspects of social life.Electric energy meter is the main tool of current electric energy metrical and economic balance, its whether accurate economic interests being directly connected to country and user.
Induction type electric energy meter, as a kind of traditional electric energy meter, has played great effect in electric energy metrical work.But along with electric power progressively moves towards market, Power marketing is had higher requirement to electric energy metrical work.Induction type electric energy meter due to congenital in the deficiency of communication aspects, so be difficult to there is development in centralized and automatic is checked meter.Though the electromechanical electric energy meter grown up afterwards can carry out the telecommunication of energy information, its available power information is fewer, such as frequency, meritorious, idle etc., realizes multi tariff metering in addition also more difficult.Although achieve pre-payment based on the electric energy meter of electromechanical, in view of security and otherwise reason, country does not advocate to use this electric energy meter on a large scale.
Summary of the invention:
The technical matters that the utility model solves: induction type electric energy meter due to congenital in the deficiency of communication aspects, so be difficult to there is development in centralized and automatic is checked meter.The available power information of electromechanical electric energy meter is fewer, realizes multi tariff metering also more difficult.
The utility model provides following technical scheme: a kind of Multifunctional electronic electric energy meter, comprises electric current and voltage sample circuit, electric energy computation chip group circuit, main control chip, real-time clock, watchdog circuit, storer, communication module, keyboard, light-emitting diode display, power module.Described electric current and voltage sample circuit is connected with electric energy computation chip group circuit, described electric energy computation chip group circuit is connected with main control chip by synchronous serial Peripheral Interface, and described real-time clock, watchdog circuit, storer, communication module, keyboard, light-emitting diode display are connected with main control chip respectively.
Native system adopts the mode of special electric energy computation chip+MCU (microcontroller) to measure electric energy.Main modular of the present utility model has power module, electric energy computation chip group circuit, main control chip.Large voltage, big current become small voltage through electric current and voltage sample circuit, small area analysis enters electric energy computation chip group circuit, real-time clock, watchdog circuit, storer, communication module, keyboard, light-emitting diode display belong to peripheral circuit or the equipment of main control chip, and it coordinates main control chip to realize the master control function of electric energy meter.Electronic electric energy meter described in the utility model overcomes the shortcoming of above-mentioned induction type electric energy meter and electromechanical electric energy meter, can measure the various information of electric energy easily, and realizes telecommunication and complete the work of checking meter and realize Distributing Network Automation.
As further illustrating technique scheme, described electric current and voltage sample circuit comprises voltage sampling circuit, current sampling circuit, and described voltage sampling circuit comprises current mode voltage transformer (VT), and described current sampling circuit comprises current transformer.The iron core of described current mode voltage transformer (VT) summation current transformer is made up of the permalloy of high permeability coefficient or high-quality steel band.The mutual inductor secondary side load of the electronic electric energy meter of less than 0.5 grade is less, and that therefore can do is very little, and the permalloy of high permeability coefficient or the high-quality steel band of adopting unshakable in one's determination is made, to reduce the phase angle difference that core loss and limited magnetoconductivity produce.Improve as one, described electric current and voltage sample circuit comprises frequency overlapped-resistable filter, and described frequency overlapped-resistable filter comprises resistance 1.2K and the electric capacity 0.01 μ F of structural symmetry.In electric current and voltage input circuit, resistance 1.2K and electric capacity 0.01 μ F constitutes frequency overlapped-resistable filter, its structure and parameter will be particular about symmetry, and adopts the good components and parts of temperature performance, thus makes the filtering that circuit reaches good, Anti-Jamming, and ensure that electric energy meter obtains good temperature characterisitic.
As further illustrating technique scheme, described main control chip comprises 8 single-chip microcomputers, described single-chip microcomputer comprises one for forming the controlled high-gain sign-changing amplifier of oscillator, described amplifier comprises input end and output terminal, the electric capacity of cross-over connection crystal oscillator and two couplings between described input end and output terminal, described crystal oscillator is the crystal oscillator of 11.0592MHZ.
As further illustrating technique scheme, described keyboard comprises reset key, electricity historical query key, up key, down key, and described electricity historical query key, up key, down key are connected to the I/O mouth of single-chip microcomputer, and described reset key is by Hardware Response Delay.
Electric energy meter carries out exchanges data through communication module and the external world, realizes the functions such as meter reading data transmission, preset system parameter.Electric energy meter communication module described in the utility model comprises RS-485 interface and infrared communication interface.
Further illustrate as of the present utility model, the utility model adopts power frequency supply mode.That is: three-phase voltage rectification after three transformer pressure-reducings, filtering, voltage stabilizing, again give system power supply.The secondary voltage of voltage transformer (VT) respectively through full wave rectifier rectification, then carries out filtering process through common mode inductance coil and obtains the stable voltage in+15V left and right, and voltage transformation is become to meet+5V the voltage that Single Chip Microcomputer (SCM) system requires by three terminal voltage voltage stabilizers.In order to prevent causing damage to circuit because line voltage is too high, between three-phase and zero line, connect a voltage dependent resistor (VDR), the interference (as lightning) of the macro-energy that decays, duration length.Voltage dependent resistor (VDR) is the non-linear resistance type element very responsive to additional voltage; in operating voltage range; the increase of its electrical resistance voltage and reducing; therefore form the shunt of a low-resistance in superpotential (exceeding twice rated voltage) period, thus can prevent the voltage at protected circuit two ends from rising further.After surge voltage, circuit voltage returns to normal work, and voltage dependent resistor (VDR) returns to high-impedance state again.In the design, selected parameter is the voltage dependent resistor (VDR) of 20K681, the resistance action when line voltage is too high, can available protecting circuit.
Accompanying drawing illustrates:
Below in conjunction with accompanying drawing, the utility model is described further:
Fig. 1 is the system chart of a kind of Multifunctional electronic electric energy meter of the utility model;
Fig. 2 is voltage sampling circuit figure in Fig. 1;
Fig. 3 is current sampling circuit figure in Fig. 1;
Fig. 4 is the Singlechip clock oscillatory circuit figure of main control chip in Fig. 1;
Fig. 5 is the power circuit diagram of Multifunctional electronic electric energy meter described in the utility model.
Symbol description in figure:
11-voltage sampling circuit; 12-current sampling circuit;
20-electric energy computation chip group circuit;
30-main control chip; 31-real-time clock; 32-watchdog circuit; 33-storer; 35-keyboard; 36-LED display; 37-RS-485 interface; 38-infrared communication interface;
T1-voltage transformer (VT); T2-voltage transformer (VT); T3-voltage transformer (VT); T4-current mode voltage transformer (VT); T9-current transformer;
BG1-full wave rectifier; BG2-full wave rectifier; BG3-full wave rectifier;
LA-common mode inductance coil; LB-common mode inductance coil;
R3-resistance; R4-resistance; R21-resistance; R22-resistance;
C6-electric capacity; C7-electric capacity; C12-electric capacity; C13-electric capacity; C42-electric capacity; C43-electric capacity;
The input end of X1-Singlechip clock oscillatory circuit; The output terminal of X2-Singlechip clock oscillatory circuit;
Y2-crystal oscillator.
Embodiment:
As shown in Figure 1, a kind of Multifunctional electronic electric energy meter, comprises electric current and voltage sample circuit, electric energy computation chip group circuit 20, main control chip 30, real-time clock 31, watchdog circuit 32, storer 33, communication module, keyboard 35, light-emitting diode display 36, power module 40.Described electric current and voltage sample circuit is connected with electric energy computation chip group circuit 20, described electric energy computation chip group circuit 20 is connected with main control chip 30 by synchronous serial Peripheral Interface, and described real-time clock 31, watchdog circuit 32, storer 33, communication module, keyboard 35, light-emitting diode display 36 are connected with main control chip 30 respectively.
As shown in Figure 2 and Figure 3, described electric current and voltage sample circuit comprises voltage sampling circuit 11, current sampling circuit 12, and described voltage sampling circuit 11 comprises current mode voltage transformer (VT) T4, and described current sampling circuit 12 comprises current transformer T9.The iron core of described current mode voltage transformer (VT) T4 summation current transformer T9 is made up of the permalloy of high permeability coefficient or high-quality steel band.Described electric current and voltage sample circuit comprises frequency overlapped-resistable filter, and described frequency overlapped-resistable filter comprises resistance R21, the resistance R22 of structural symmetry, resistance R3, resistance R4 and electric capacity C12, electric capacity C13, electric capacity C6, electric capacity C7.The TV31B-02 type current mode voltage transformer (VT) that voltage sampling circuit 11 described in the utility model adopts Yuan Xing electronics corporation to produce.Current sampling circuit 12 adopts the accurate AC current transformer of first star TA20 type.
The utility model adopts special electric energy computation chip ATT7022B to complete the metering of electric energy, and it is a kind of special high-accuracy integrated circuit for power measurement or electric energy metrical that Zhuhai Ju Li company produces.
Main control chip 30 described in the utility model adopts AT89C52, and AT89C52 is the low-voltage that American ATMEL is produced, high-performance CMOS 8 single-chip microcomputers.
ATT7O22B and single-chip microcomputer have 6 lines, and wherein four is SPI interface line: CS, SCK, DIN, DOU, the reset control line RESET of an ATT7022B, a handshake line SIG.The data write of ATT7022B with read the spi bus mode of four-wire system of adopting, the mode taking I/O mouth SPI-bus analogue sequential is considered in software programming, so any four two-way I/O mouths that four of ATT7022B spi bus are connected to CPU are just passable.The reseting signal line of ATT7O22A and and CPU between handshake line directly receive the two-way I/0 mouth of CPU.
Described single-chip microcomputer comprises one for forming the controlled high-gain sign-changing amplifier of oscillator, described amplifier comprises input end X1 and output terminal X2, electric capacity C42, the electric capacity C43 of cross-over connection crystal oscillator Y2 and two coupling between described input end X1 and output terminal X2, described crystal oscillator Y2 is the crystal oscillator of 11.0592MHZ, as shown in Figure 4.
Real-time clock 31 circuit of the present utility model uses DS1302 as time reference.
The utility model selects the low price monitoring chip IMP813L with WatchDog Timer and step-down measuring ability.
Described keyboard comprises reset key, electricity historical query key, up key, down key, and described electricity historical query key, up key, down key are connected to the I/O mouth of single-chip microcomputer.
The utility model selects FM24C16 to realize storer 33 Elementary Function.
The design adopts the static state display circuit formed with serioparallel exchange shift register 74HC164.So-called static state display is exactly that each display will take the independent I/O interface with latch function for stroke section font code.As long as such single-chip microcomputer is sent to interface circuit the font code that will show, just need not manage it, until when will show new data, then send new graphemic code.Two I/O ports P2.6, P2.7 of AT89C52 single-chip microcomputer, external 7 74HC164 are as the static state display interface of 7 light-emitting diode displays, and in two display months, five show other data.Using the P2.6 of AT89C52 as DOL Data Output Line, P2.7 is as shift clock pulses.Reset termination+5V, only in this way, time clock is just effective.
As shown in Figure 1, described communication module comprises RS-485 interface 37 and infrared communication interface 38.
As shown in Figure 5, described power module comprises power circuit, described power circuit comprises: voltage transformer (VT) T1, voltage transformer (VT) T2, voltage transformer (VT) T3, the full wave rectifier BG1 be connected with voltage transformer (VT) T1, voltage transformer (VT) T2, voltage transformer (VT) T3, full wave rectifier BG2, full wave rectifier BG3, the common mode inductance coil LA be connected with full wave rectifier BG1, full wave rectifier BG2, full wave rectifier BG3, common mode inductance coil LB, the three terminal voltage voltage stabilizers be connected with common mode telefault LA, common mode inductance coil LB.
Above content is only better embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (8)
1. a Multifunctional electronic electric energy meter, comprise electric current and voltage sample circuit, electric energy computation chip group circuit (20), main control chip (30), real-time clock (31), watchdog circuit (32), storer (33), communication module, keyboard (35), light-emitting diode display (36), power module (40), it is characterized in that: described electric current and voltage sample circuit is connected with electric energy computation chip group circuit (20), described electric energy computation chip group circuit (20) is connected with main control chip (30) by synchronous serial Peripheral Interface, described real-time clock (31), watchdog circuit (32), storer (33), communication module, keyboard (35), light-emitting diode display (36) is connected with main control chip (30) respectively.
2. a kind of Multifunctional electronic electric energy meter as claimed in claim 1, it is characterized in that: described electric current and voltage sample circuit comprises voltage sampling circuit (11), current sampling circuit (12), described voltage sampling circuit (11) comprises current mode voltage transformer (VT) (T4), and described current sampling circuit (12) comprises current transformer (T9).
3. a kind of Multifunctional electronic electric energy meter as claimed in claim 2, is characterized in that: the iron core of described current mode voltage transformer (VT) (T4) summation current transformer (T9) is made up of the permalloy of high permeability coefficient or high-quality steel band.
4. a kind of Multifunctional electronic electric energy meter as claimed in claim 2, is characterized in that: described electric current and voltage sample circuit comprises frequency overlapped-resistable filter, and described frequency overlapped-resistable filter comprises the resistance (R21 of structural symmetry; R22; R3; And electric capacity (C12 R4); C13; C6; C7).
5. a kind of Multifunctional electronic electric energy meter as claimed in claim 1, it is characterized in that: described main control chip (30) comprises 8 single-chip microcomputers, described single-chip microcomputer comprises one for forming the controlled high-gain sign-changing amplifier of oscillator, described amplifier comprises input end (X1) and output terminal (X2), the electric capacity (C42, C43) of cross-over connection crystal oscillator (Y2) and two couplings between described input end (X1) and output terminal (X2), the crystal oscillator that described crystal oscillator (Y2) is 11.0592MHZ.
6. a kind of Multifunctional electronic electric energy meter as claimed in claim 5, it is characterized in that: described keyboard comprises reset key, electricity historical query key, up key, down key, described electricity historical query key, up key, down key are connected to the I/O mouth of single-chip microcomputer.
7. a kind of Multifunctional electronic electric energy meter as described in claim 1 or 5, is characterized in that: described communication module comprises RS-485 interface (37) and infrared communication interface (38).
8. a kind of Multifunctional electronic electric energy meter as claimed in claim 1, it is characterized in that: described power module comprises power circuit, described power circuit comprises voltage transformer (VT) (T1; T2; T3), with voltage transformer (VT) (T1; T2; T3) full wave rectifier (BG1 connected; BG2; BG3), with full wave rectifier (BG1; BG2; BG3) the common mode inductance coil (LA connected; LB), with common mode telefault (LA; LB) the three terminal voltage voltage stabilizers connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420584978.2U CN204188705U (en) | 2014-10-11 | 2014-10-11 | A kind of Multifunctional electronic electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420584978.2U CN204188705U (en) | 2014-10-11 | 2014-10-11 | A kind of Multifunctional electronic electric energy meter |
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| Publication Number | Publication Date |
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| CN204188705U true CN204188705U (en) | 2015-03-04 |
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| CN201420584978.2U Expired - Fee Related CN204188705U (en) | 2014-10-11 | 2014-10-11 | A kind of Multifunctional electronic electric energy meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345211A (en) * | 2014-10-11 | 2015-02-11 | 苏州克兰兹电子科技有限公司 | Multifunctional electronic watt-hour meter |
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2014
- 2014-10-11 CN CN201420584978.2U patent/CN204188705U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345211A (en) * | 2014-10-11 | 2015-02-11 | 苏州克兰兹电子科技有限公司 | Multifunctional electronic watt-hour meter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20151011 |
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| EXPY | Termination of patent right or utility model |