CN202563005U - Single-phase electric energy meter suitable for two-way automatic communication system (TWACS) communication function - Google Patents
Single-phase electric energy meter suitable for two-way automatic communication system (TWACS) communication function Download PDFInfo
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- CN202563005U CN202563005U CN2012201782534U CN201220178253U CN202563005U CN 202563005 U CN202563005 U CN 202563005U CN 2012201782534 U CN2012201782534 U CN 2012201782534U CN 201220178253 U CN201220178253 U CN 201220178253U CN 202563005 U CN202563005 U CN 202563005U
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Abstract
The utility model discloses a single- phase electric energy meter suitable for two-way automatic communication system (TWACS) communication function. The single- phase electric energy meter comprises a TWACS communication function circuit, an electric energy measuring management circuit, a transformer, a relay, a relay control circuit and a triode voltage switching circuit. The TWACS communication function circuit is communicated with a serial port of the electric energy measuring management circuit through the triode voltage switching circuit. The single- phase electric energy meter can achieve the requirement for high purity of a power system in the TWACS communication function circuit, thereby effectively increasing success rate of communications.
Description
Technical field
The utility model relates to a kind of single-phase electric energy meter of the TWACS of being suitable for communication function.
Background technology
The TWACS power line communication technology, promptly two-way power frequency automated communications systems (Two-Way Automated Communications System) are a kind of comparatively advanced power line communication technologies of U.S. ACLARA company research and development.This technology success ratio of once communicating by letter is higher than 99.6%.The transmission range of TWACS signal is almost unrestricted, and does not need repeater or signal condition equipment, and these are that general power-line carrier communication is needed.The TWACS power line communication technology is compared with common line of electric force modulated carrier wave technology (PLC) has following advantage: 1, need not to do meticulous adjustment to system or power transmission line situation.2, need not special measures cross-over connection transformer and capacitor pond.3, TWACS can be on long power transmission line Gong Zuo – aerial line and bury the ground transmission cable.4, can not produce the high frequency radiation emission.
TWACS communication function circuit has been used for single-phase electric energy meter at present.As shown in Figure 1, this ammeter has TWACS communication function circuit, electric energy measuring management circuit, transformer etc.Wherein, Because TWACS communication function circuit is had relatively high expectations to the power supply degree of purity; Need its power supply and measuring control circuit power is relatively independent, so TWACS communication function circuit adopts two different secondary side voltage outputs of transformer to supply with the electric energy measuring management circuit power.Adopt the optocoupler coupling scheme to realize serial communication between TWACS communication function circuit and the electric energy measuring management circuit; Because the optocoupler action current of TWACS communication function circuit one side is big; Introduce big noise for TWACS communication function circuit power system, the communication success ratio between two circuit is low.
The utility model content
The purpose of the utility model is to provide a kind of single-phase electric energy meter that is suitable for the TWACS communication function that can effectively improve the communication success ratio.
The single-phase electric energy meter of this TWACS of the being suitable for communication function that the utility model provides; The table meter power supply, relay, the control relay circuit that comprise TWACS communication function circuit, electric energy measuring management circuit, transformer, draw by transformer; Also comprise the triode voltage conversion circuit, TWACS communication function circuit is through said triode voltage conversion circuit and electric energy measuring management circuit serial communication.
Said triode voltage conversion circuit; Comprise two-way, this two-way has two triodes respectively, and wherein the base stage of a triode connects the transmit port of measuring control circuit chip in one tunnel two triodes; Emitter connects table meter power firestreak; The collector of a triode connects the receiving end of TWACS communication function circuit chip, and the collector of a triode connects the receiving end of measuring control circuit chip in two triodes on another road, and the base stage of a triode connects the transmitting terminal of TWACS communication function circuit chip; Emitter connects table meter power firestreak, and the conversion of circuit voltage realizes through the resistance chain dividing potential drop that triode connects.Said table meter power supply is supplied with by the output of transformer self coupling end.
Owing to the optical coupling isolation circuit between TWACS communication function circuit in the prior art and the electric energy measuring management circuit is replaced with the triode transtation mission circuit, is utilized the switching characteristic of triode to realize the level conversion between transmitting terminal and the receiving end.Because the triode conducting is less to current requirements, can realize the high-purity requirement of TWACS communication function circuit power system, thereby can effectively improve the communication success ratio.
Description of drawings
Fig. 1 is the structural representation of two line single-phase electric energy meters of prior art.
Fig. 2 is the structural representation of the utility model.
Fig. 3 is triode voltage conversion circuit figure in a kind of embodiment of the utility model.
Embodiment
As can beappreciated from fig. 2 the utility model table meter power supply, relay, control relay circuit of still having TWACS communication function circuit, electric energy measuring management circuit, transformer, drawing by transformer.Measuring control chip in the electric energy measuring management circuit adopts the 71M6521FE chip of MAXIM company, can carry out the sampling and the power calculation of electric current and voltage, and circuit is the 3.3V power-supply system.TWACS communication function circuit is quoted the TWACS power line communication technology of ACLARA company and is realized the line of electric force two-way communication, and table meter power supply is supplied with by the output of transformer self coupling end.
The utility model utilizes TWACS communication function circuit and measuring control circuit can do the characteristic of power supply reference jointly with power firestreak, light-coupled isolation communication of the prior art is replaced with the triode voltage conversion circuit connects.The height of having realized TWACS communication function circuit power is pure, has strengthened the communication success ratio.
Fig. 3 has reflected the triode voltage conversion circuit, adopts serial communication between the chip of TWACS communication function circuit and the measuring control chip.TX, RX are the transmitting and receiving terminal mouth of measuring control circuit chip, and TX2, RX2 are the transmitting and receiving terminal mouth of TWACS communication function circuit chip.Among the figure ,+5V is a TWACS communication function circuit power voltage, is 5V with respect to power supply ground GPLC; V3P3SYS is 3.3V for table meter measuring control circuit power voltage with respect to power supply ground GND.
At first, GPLC and V3P3SYS are connected to table meter live wire UL jointly, realize that the reference of two kinds of circuit is unified, the feasibility condition that obtains to carry out through the triode voltage conversion circuit direct communication.For the isolation that realizes crosstalking between two kinds of circuit, connect through two magnetic beads and realize.At this moment, GPLC exceeds 3.3V than GND.If the GND current potential is 0V, then+5V is 8.3V, V3P3SYS and GPLC are all 3.3V.Convert example from high to low into level; When the TX level changes into when low from height, triode Q6 is by by becoming conducting, and triode Q4 base voltage becomes 3.3V by 0V; The Q4 conducting; The potential-divider network that utilizes resistance R R3 and RR10 to form, the RX2 level becomes 3.3V by 8.3V, promptly realized RX2 with respect to GPLC by high level to low level conversion.
This circuit utilizes the switching characteristic of triode to realize the level conversion between transmitting terminal and the receiving end.Because the triode conducting is less to current requirements, can realize the high-purity requirement of TWACS communication function circuit power system.The key point of this circuit is the circuit of two kinds of relative separation is connected on the same potential reference, realizes the level conversion of two kinds of circuit to have ready conditions.
Claims (3)
1. single-phase electric energy meter that is suitable for the TWACS communication function; Comprise TWACS communication function circuit, electric energy measuring management circuit, transformer, by table meter power supply, relay, control relay circuit that transformer is drawn, it is characterized in that adopting between said TWACS communication function circuit and the electric energy measuring management circuit triode voltage conversion circuit to realize serial communication.
2. the single-phase electric energy meter that is suitable for the TWACS communication function according to claim 1; It is characterized in that said triode voltage conversion circuit comprises two-way; This two-way has two triodes respectively; Wherein the base stage of a triode connects the transmit port of measuring control circuit chip in one tunnel two triodes, and emitter connects table meter power firestreak, and the collector of a triode connects the receiving end of TWACS communication function circuit chip; The collector of a triode connects the receiving end of measuring control circuit chip in two triodes on another road; The base stage of a triode connects the transmitting terminal of TWACS communication function circuit chip, and emitter connects table meter power firestreak, and the conversion of circuit voltage realizes through the resistance chain dividing potential drop that triode connects.
3. the single-phase electric energy meter that is suitable for the TWACS communication function according to claim 1 and 2 is characterized in that table meter power supply is by transformer self coupling end output supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201782534U CN202563005U (en) | 2012-04-25 | 2012-04-25 | Single-phase electric energy meter suitable for two-way automatic communication system (TWACS) communication function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201782534U CN202563005U (en) | 2012-04-25 | 2012-04-25 | Single-phase electric energy meter suitable for two-way automatic communication system (TWACS) communication function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202563005U true CN202563005U (en) | 2012-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201782534U Expired - Lifetime CN202563005U (en) | 2012-04-25 | 2012-04-25 | Single-phase electric energy meter suitable for two-way automatic communication system (TWACS) communication function |
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| Country | Link |
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| CN (1) | CN202563005U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105261196A (en) * | 2015-11-27 | 2016-01-20 | 国网重庆市电力公司电力科学研究院 | TWACS-based rural power grid automatic meter reading system |
-
2012
- 2012-04-25 CN CN2012201782534U patent/CN202563005U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105261196A (en) * | 2015-11-27 | 2016-01-20 | 国网重庆市电力公司电力科学研究院 | TWACS-based rural power grid automatic meter reading system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121128 |