CN202512171U - Single-phase electric energy meter with built-in TWACS (two-way automatic communication system) communication function circuit - Google Patents
Single-phase electric energy meter with built-in TWACS (two-way automatic communication system) communication function circuit Download PDFInfo
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- CN202512171U CN202512171U CN2012201781851U CN201220178185U CN202512171U CN 202512171 U CN202512171 U CN 202512171U CN 2012201781851 U CN2012201781851 U CN 2012201781851U CN 201220178185 U CN201220178185 U CN 201220178185U CN 202512171 U CN202512171 U CN 202512171U
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Abstract
The utility model provides a single-phase electric energy meter with a built-in TWACS (two-way automatic communication system) communication function circuit. The single-phase electric energy meter comprises a transformer, a relay, an electric energy metering management circuit, and a TWACS communication function circuit, wherein the TWACS communication function circuit communicates with the electric energy metering management circuit by a serial port. The single-phase electric energy meter is characterized in that two relays are arranged; the two relays share the power supply, and are internally arranged inside the meter and controlled by a same management chip, and the power supply shared by the relays is output and supplied by a self-coupling end of the transformer. According to the utility model, a TWACS power line communication technology is expanded to a single-phase three-wire electrical environment. Due to adopting of the two relays, the single-phase electric energy meter can be used as a single-phase two-wire electric energy meter and also can be used as a single-phase three-wire electric energy meter, and the application range is expanded.
Description
Technical field
The utility model relates to a kind of single-phase electric energy meter that is applicable to built-in TWACS communication function circuit.
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.
At present domestic is incorporated in the single-phase-two-wire electric energy meter with the TWACS power line communication technology.As shown in Figure 1, this electric energy meter has only a relay, and only can be used for inlet wire is the single-phase-two-wire electric energy meter of a live wire and a zero line, and range of application is narrow, can not be applicable to that the phasing degree still is the single-phase three-wire power utilization environment of 180 degree.The power supply that this appearance meter adopts the output of Circuit Fault on Secondary Transformer two-way to do electric energy measuring management circuit and TWACS communication function circuit is respectively supplied with, and realizes that the power-supply system of two kinds of circuit is isolated.
The utility model content
The purpose of the utility model is to provide a kind of can be used for the single-phase electric energy meter that two lines can be used for three-way built-in TWACS communication function circuit again.
The single-phase electric energy meter of this built-in TWACS communication function circuit that the utility model provides; Comprise transformer, relay, control relay circuit, contain electric energy measuring management circuit, the TWACS communication function circuit of measuring control chip; Adopt serial communication between TWACS communication function circuit and the electric energy measuring management circuit; Control relay circuit is controlled by the electric energy measuring management circuit; Said relay and control relay circuit all have two, these two relay common sources and through said control relay circuit through the measuring control chip controls, the shared power supply of relay is supplied with by the output of transformer self coupling end.
In order to strengthen the communication success ratio, be connected with a triode voltage conversion circuit between built-in TWACS communication function circuit and the said electric energy measuring management circuit.
The utility model makes this single-phase electric energy meter not only can be used for the single-phase-two-wire power utilization environment but also can be used for the single-phase three-wire power utilization environment owing to adopted two relays, and range of application obtains enlarging.
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 the relay driving power circuit.
Fig. 4 is the control circuit of relay.
Fig. 5 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 still has TWACS communication function circuit, electric energy measuring management circuit, relay, control relay circuit, 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 A, B two phase voltage electric currents.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.Relay adopts two relay drive circuit power supplys to be supplied with by the output of transformer self coupling end, and the measuring control chip is realized the control of double relay through a control circuit.
The relay driving power is supplied with by the output of transformer self coupling end, and the measuring control chip is realized the control of double relay through a control circuit.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-Fig. 4 has reflected the relay driving power.
As can beappreciated from fig. 3 drive high pressure from taking out between transformer self coupling end and the live wire UL, the voltage of transformer self coupling end UN_RY output is a little more than relay driving voltage VRY.Power supply is through producing relay driving electric charge to electrochemical capacitor C1 and C2 charging back.To direct current-24V, power-supply system ground GNDRY is attached on the live wire UL with the voltage stabilizing of VRY voltage for commutation diode D15 and voltage stabilizing diode DZ1.Mention according to last trifle, because the power supply V3P3SYS of relay control chip 71M6521FE also links to each other with UL, so GNDRY and V3P3SYS are same electric point, relay control signal can directly link to each other with the relay power system, need not isolation coupling.
Fig. 4 has reflected the control circuit of relay.Two relays have identical control circuit.As can beappreciated from fig. 5 P4 is the relay coil combination hub.RYON and RYOFF are the control I/O signal of relay control chip 71M6521FE to relay.When RYON is a high level, when RYOFF is low level, RYON and its power supply V3P3SYS equipotential, promptly with the GNDRY equipotential, triode Q12 ends; RYOFF is than the low 3.3V of GNDRY, triode Q16, Q11 conducting, and triode Q15 ends, and has forward current to flow through relay, relay closes; Otherwise, triode Q12, Q15 conducting, Q16, Q11 end, and have inverse current to flow through relay, and relay breaks off.
Fig. 5 has reflected the triode voltage conversion circuit, adopts serial communication between TWACS communication function circuit and the measuring control circuit." TX " " RX " is the transmitting and receiving terminal mouth of measuring control circuit chip, and " TX2 " " RX2 " is the transmitting and receiving terminal mouth of TWACS communication function circuit chip.Among the figure, "+5V " is 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.For the isolation that realizes crosstalking between two kinds of circuit, connect through two magnetic beads and realize.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 (2)
1. the single-phase electric energy meter of a built-in TWACS communication function circuit; Comprise transformer, relay, control relay circuit, contain electric energy measuring management circuit, the TWACS communication function circuit of measuring control chip; Adopt serial communication between TWACS communication function circuit and the electric energy measuring management circuit; Control relay circuit is controlled by the electric energy measuring management circuit; It is characterized in that said relay and control relay circuit all have two, these two relay common sources and through said control relay circuit through the measuring control chip controls, the shared power supply of relay is supplied with by the output of transformer self coupling end.
2. the single-phase electric energy meter of built-in TWACS communication function circuit according to claim 1 is characterized in that being connected with a triode voltage conversion circuit between built-in TWACS communication function circuit and the said electric energy measuring management circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201781851U CN202512171U (en) | 2012-04-25 | 2012-04-25 | Single-phase electric energy meter with built-in TWACS (two-way automatic communication system) communication function circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201781851U CN202512171U (en) | 2012-04-25 | 2012-04-25 | Single-phase electric energy meter with built-in TWACS (two-way automatic communication system) communication function circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202512171U true CN202512171U (en) | 2012-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201781851U Expired - Lifetime CN202512171U (en) | 2012-04-25 | 2012-04-25 | Single-phase electric energy meter with built-in TWACS (two-way automatic communication system) communication function circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202512171U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646071A (en) * | 2018-07-03 | 2018-10-12 | 青岛东软载波科技股份有限公司 | A kind of novel modularized intelligent electric energy meter |
-
2012
- 2012-04-25 CN CN2012201781851U patent/CN202512171U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646071A (en) * | 2018-07-03 | 2018-10-12 | 青岛东软载波科技股份有限公司 | A kind of novel modularized intelligent electric energy meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121031 |