CN204142835U - A kind of single-phase electric energy meter - Google Patents

A kind of single-phase electric energy meter Download PDF

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Publication number
CN204142835U
CN204142835U CN201420438079.1U CN201420438079U CN204142835U CN 204142835 U CN204142835 U CN 204142835U CN 201420438079 U CN201420438079 U CN 201420438079U CN 204142835 U CN204142835 U CN 204142835U
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China
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circuit
input
electric energy
output terminal
microprocessor
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CN201420438079.1U
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Chinese (zh)
Inventor
谢晓晖
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FUJIAN AGRICULTURAL MECHANIZATION INSTITUTE
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FUJIAN AGRICULTURAL MECHANIZATION INSTITUTE
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Abstract

The utility model discloses a kind of single-phase electric energy meter, comprise ic for energy metering, microprocessor, network communication interface circuit etc., wherein said network communication interface circuit comprises: the first photoelectrical coupler, and its output terminal is connected with the network input of described microprocessor; Second photoelectrical coupler, its input end is connected with the network output of described microprocessor; Network transceivers, its receiver output terminal connects the input end of described first photoelectrical coupler, and its driver input end connects the output terminal of described second photoelectrical coupler; TVS diode, is connected between the homophase input/output terminal of described network transceivers and reverse input/output terminal; First thermistor, its one end connects the homophase input/output terminal of described network transceivers; Second thermistor, its one end connects the anti-phase input output terminal of described network transceivers; Network communication interface connector, connects the other end of described first thermistor and described second thermistor.

Description

A kind of single-phase electric energy meter
Technical field
The utility model relates to power domain, particularly a kind of single-phase electric energy meter.
Background technology
The design proposal of existing single-phase electronic energy meter both domestic and external has following two kinds:
1, single chip solution (SOC) is exactly metering circuit, clock circuit and MCU are combined in same chip.The advantage of this scheme is that the simple cost of circuit is low, and shortcoming is that measuring accuracy and clock accuracy are low, and poor reliability does not reach the technical requirement of state's net intelligent electric energy meter, can only be used for designing easy data acquisition instrument.
2, combined type scheme, selects special-purpose multifunctional electric energy computation chip, external hardware clock chip and single-chip microcomputer.The data such as voltage, electric current, power factor relevant with electric energy metrical by the sampling of special-purpose multifunctional electric energy computation chip, the meritorious forward and reverse electricity of metering.By the management of computing of chip microcontroller data, display, communication, storage and revenue insurance, realize the measuring requirement of tou power price and gradient electricity price.Advantage is that metering and clock accuracy are high, and reliability is high, can meet the technical requirement of State Grid Corporation of China to intelligent electric meter; Shortcoming is that circuit is slightly complicated, and cost is slightly high, is applicable to the senior measuring instrument of design.
On the communication modes of electric energy meter, for being applicable to the different application scenarios such as rural area, city, factory, the technical scheme that there is the electric energy meter comprising the meter reading methods such as infrared communication, 485 serial communications, power communication, GPRS communication exists.But above-mentioned electric energy meter lacks anti-lightning strike and forceful electric power misconnection design, when thunderbolt and forceful electric power misconnection, easily causes communicating circuit to damage, affects electric energy metrical.
Utility model content
The purpose of this utility model is to provide a kind of single-phase electric energy meter, can solve the problems of the technologies described above better.
According to an aspect of the present utility model, provide a kind of single-phase electric energy meter, comprising:
Be used to provide the power circuit of working power;
Be used for the ic for energy metering using electric energy to measure to user;
Microprocessor, its data input pin connects the data output end of described ic for energy metering;
Infra red communication port circuit, it connects the infrared input/output terminal of described microprocessor;
Network communication interface circuit, it connects the network input/output terminal of described microprocessor;
Wherein, described network communication interface circuit comprises:
Be used for realizing the first photoelectrical coupler of electrical isolation, its output terminal is connected with the network input of described microprocessor;
Be used for realizing the second photoelectrical coupler of electrical isolation, its input end is connected with the network output of described microprocessor;
Network transceivers, its receiver output terminal connects the input end of described first photoelectrical coupler, and its driver input end connects the output terminal of described second photoelectrical coupler;
TVS diode, is connected between the homophase input/output terminal of described network transceivers and reverse input/output terminal;
First thermistor, its one end connects the homophase input/output terminal of described network transceivers;
Second thermistor, its one end connects the anti-phase input output terminal of described network transceivers;
Network communication interface connector, connects the other end of described first thermistor and described second thermistor.
Preferably, described power circuit is the series connection linear power supply with two-way output.
Preferably, described series connection linear power supply comprises:
The secondary power transformer that there is two-way and export, wherein described in a road direction, network communication interface circuit provides independent current source;
With the 3rd thermistor of described power transformer primary series;
With the first voltage dependent resistor (VDR) of described power transformer primary parallel.
Preferably, described ic for energy metering comprises:
To the current sampling circuit that input current is sampled;
To the voltage sampling circuit that input voltage is sampled;
Connect the electric energy computation chip of the signal output part of described current sampling circuit and voltage sampling circuit.
Preferably, described electric energy computation chip adopts special chip ATT7053.
Preferably, described microprocessor adopts chip PIC18F86J90.
Preferably, described single-phase electric energy meter also comprises:
Electric line carrier communication circuit, it connects the power line carrier input/output terminal of described microprocessor.
Preferably, described electric line carrier communication circuit comprises carrier communication chip PLCi38-III.
Preferably, described single-phase electric energy meter also comprises:
What be connected with described microprocessor-based control output terminal forfeits electric control circuit.
Preferably, described electric control circuit of forfeiting comprises:
What be connected with described microprocessor-based control output terminal is used for receiving the relay drive circuit forfeiting electric control signal;
The magnetic latching relay being used for being switched on or switched off input power be connected with the output terminal of described relay drive circuit;
What be connected with described magnetic latching relay is used for the feedback of status of described magnetic latching relay to the state-feedback circuit of described microprocessor.
Compared with prior art, the beneficial effects of the utility model are:
1, network communication interface circuit of the present utility model adopts TVS diode, the first thermistor and the second thermistor, can prevent from being struck by lightning or forceful electric power misconnection time infringement to circuit.
2, network communication interface circuit of the present utility model adopts independent current source to power, signal between its with microcontroller is connected employing first photoelectrical coupler and the second photoelectrical coupler realizes electrical isolation, effectively avoids the electric quantity metering work of network communication interface damage to whole electric energy meter.
Accompanying drawing explanation
Fig. 1 is the single-phase electric energy meter system architecture schematic diagram that the utility model embodiment provides;
Fig. 2 is the single-phase electric energy meter structural representation that the utility model embodiment provides;
Fig. 3 is the network communication interface circuit diagram that the utility model embodiment provides;
Fig. 4 a is the infrared receiving circuit figure that the utility model embodiment provides;
Fig. 4 b is the infrared transmitting circuit figure that the utility model embodiment provides;
Fig. 5 a is that the power line carrier signal that the utility model embodiment provides receives, radiating circuit figure;
Fig. 5 b is the carrier chip partial circuit figure that the utility model embodiment provides;
Fig. 6 is the power circuit diagram that the utility model embodiment provides;
Fig. 7 a is the voltage sampling circuit figure that the utility model embodiment provides;
Fig. 7 b is the first current sampling circuit figure that the utility model embodiment provides;
Fig. 7 c is the second current sampling circuit figure that the utility model embodiment provides;
Fig. 7 d is the electric energy computation chip circuit diagram that the utility model embodiment provides;
Fig. 8 is the microcontroller circuit figure that the utility model embodiment provides;
Fig. 9 is the relay drive circuit figure that the utility model embodiment provides.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, should be appreciated that following illustrated preferred embodiment is only for instruction and explanation of the utility model, and be not used in restriction the utility model.
Fig. 1 is the single-phase electric energy meter system architecture schematic diagram that the utility model embodiment provides, as shown in Figure 1, power circuit, ic for energy metering, MCU microprocessor and peripheral circuit, liquid crystal display circuit, external hardware clock circuit, data storage circuitry, output of pulse signal circuit, communicating circuit etc. is comprised.
Wherein, ic for energy metering, by improving the sample mode of electric power signal, realizes single-phase voltage and the current signal sampling of wide frequency domain, ensures the measuring accuracy of electricity and electrical quantity.
Wherein, ic for energy metering adopts special-purpose multifunctional electric energy computation chip, the data such as voltage, electric current, power factor relevant with electric energy metrical by the sampling of special-purpose multifunctional electric energy computation chip, and the meritorious forward and reverse electricity of metering, for MCU microprocessor processes.
Wherein, communicating circuit adopts modular design, can using infrared communication and RS485 communication as basic communication function, electric power carrier communication function, WI-FI wireless communication function or other communication modes (as ZIGBEE wireless communication function, optical-fibre communications, GPRS communication) are designed to the standalone module with general-purpose interface, by user's choice for use.Such as, design three tunnels independently communication interface circuit, for the road infra red communication port circuit checked meter in scene, for road network communication interface circuit (such as RS-485 and WiFi) and a road electric line carrier communication interface circuit of remote meter reading and control.
Wherein, data can be passed to concentrator by electric energy meter of the present utility model, concentrator passes through the modes such as GPRS or CDMA or PSTN (telephone wire) again by data remote on Internet, and host computer workstation obtains data and issuing command from Internet.
Fig. 2 is the single-phase electric energy meter structural representation that the utility model embodiment provides, as shown in Figure 2, comprise: the power circuit being used to provide working power, be used for the ic for energy metering using electric energy to measure to user, data input pin connects the microprocessor of the data output end of described ic for energy metering, connect the infra red communication port circuit of the infrared input/output terminal of described microprocessor, connect the network communication interface circuit of the network input/output terminal of described microprocessor.
Wherein, described network communication interface circuit comprises: be used for realizing the first photoelectrical coupler of electrical isolation, the second photoelectrical coupler being used for realizing electrical isolation, network transceivers, TVS diode, the first thermistor, the second thermistor and network communication interface connector.Further, the output terminal of described first photoelectrical coupler is connected with the network input of described microprocessor, and the input end of described second photoelectrical coupler is connected with the network output of described microprocessor; The receiver output terminal of described network transceivers connects the input end of described first photoelectrical coupler, and driver input end connects the output terminal of described second photoelectrical coupler; Described TVS diode is connected between the homophase input/output terminal of described network transceivers and reverse input/output terminal; One end of described first thermistor connects the homophase input/output terminal of described network transceivers; One end of described second thermistor connects the anti-phase input output terminal of described network transceivers; Described network communication interface connector connects the other end of described first thermistor and described second thermistor.
Single-phase electric energy meter of the present utility model can be designed with the both-way communication interface of three or more autonomous channels, and communication protocol can meet the requirement of DL/T645-2007 communication protocol, and compatible DL/T645-1997.Below for network communication, infrared, power line carrier three both-way communication interfaces, composition graphs 3-Fig. 5 further illustrates.
Fig. 3 is network communication interface (for the RS485) circuit theory diagrams that the utility model embodiment provides, and as shown in Figure 3, RS-485 communication interface has anti-lightning strike and overcurrent proof misconnection circuit design, and it comprises:
Photoelectrical coupler TP3, output connecting microprocessor;
Photoelectrical coupler TP4, input connects microprocessor;
Transceiver HM3085EESA, its receiver output pin 1 connects the input of TP3, and its receiver output enable pin 2 is connected the output of TP4 with driver output enable pin 3;
TVS diode D1, it is connected between the homophase input and output pin 6 of HM3085EESA and anti-phase input output pin 7;
Thermistor RVT1, its one end connects the anti-phase input output pin 7 of HM3085EESA;
Thermistor RVT2, its one end connects the homophase input and output pin 6 of HM3085EESA;
Connector 485AB-CON, it connects the other end of described RVT1 and RVT2.
The utility model is can the network communication interface of anti-lightning strike and misconnection forceful electric power design, it adopts independent current source to power, being connected with the signal between main circuit adopts TP3 and TP4 to realize electrical isolation, avoids the damage because of communication interface to affect the gage work of integrated circuit.For network communication interface circuit, thunderbolt energy is absorbed by D1, RVT1 and RVT2 carries out open circuit protection in the moment that line current increases, thus prevents thunderbolt and forceful electric power misconnection to the infringement of circuit.
Fig. 4 a and Fig. 4 b is the infrared receiver that provides of the utility model embodiment and radiating circuit schematic diagram respectively, and it is used for scene and checks meter, as shown in figures 4 a and 4b, wherein:
Infrared receiving circuit comprises:
Infrared remote receiver FM-9038LM, its output pin connects microprocessor.
Infrared transmitting circuit comprises:
Triode T8, its base stage connects microprocessor by resistance R58;
Infrared transmitting tube L2, its negative electrode connects the emitter of T8, and anode connects 3.3V voltage;
Triode T9, its base stage connects microprocessor by resistance R67, and launch collection ground connection, collector connects the collector of described T8 by resistance R59.
Fig. 5 a is that the power line carrier signal that the utility model embodiment provides receives, radiating circuit figure, if 5b is the carrier chip partial circuit figure that the utility model embodiment provides, as shown in figure 5 a and 5b, electric line carrier communication interface circuit of the present utility model connects the power line carrier input/output terminal of microprocessor, it has built-in PLC communication module, can change separately, and between data concentrator, realize power line carrier bi-directional communication function.Wherein, described PLC communication module adopts carrier communication chip PLCi38-III, as shown in Figure 5 b.PLCi38-III is specially spread spectrum communication chip that power line medium designs as communication channel, this chip has the features such as communication reliability is high, frame relay forwarding strategy, perfect network data communication protocol suite, and has the features such as low cost, low-power consumption, peripheral components are few.
Shown in Fig. 5 a, circuit comprises transtation mission circuit and receiving circuit, described transtation mission circuit is made up of modulated spread spectrum signal input, tuned power amplifier and signal coupling circuit three part, its main task is output signal power expeditiously, and carrier signal is injected line of electric force effectively.Described receiving circuit by signal coupling circuit, bandpass filter BPF and AFE (analog front end) AFE tri-part form, its major function effectively receives and analog demodulator from the spread spectrum communications signals on line of electric force.The design object of described receiving circuit is the Signal reception power (part for signal coupling circuit design improved in frequency band, need with transmitting portion Uniting), and suppress to greatest extent from the noise on line of electric force, and make the insertion loss of passive filtering network minimum.Because transmitting portion and the circuit structure of receiving unit and the selection of components and parts make influencing each other of transmitting portion and receiving unit less.
Wherein, described signal coupling circuit is the essential elements be connected with line of electric force by carrier communication circuit, its major function comprises: the AC signal of filtering 220VAC/50Hz (or 110VAC/60Hz), suppress the transient voltage strike (as: superpotential that thunderbolt causes, the surge of line voltage and peak voltage, and static discharge voltage etc.), can expeditiously by the injection line of electric force that transmits, ensure the useful signal power on line of electric force, minimum decay and optimum reception is realized to from the useful signal on line of electric force, suppress from the noise on line of electric force to greatest extent, there is good band-pass filtering function, meet the requirement of relevant criterion to output signal level and harmonic level.
Further, electric capacity C2 filtering exchanges 50Hz signal, adopts isolating transformer T1 to make line of electric force loop and communication unit Secure isolation, and forms the function of Hi-pass filter by the secondary inductance L of electric capacity C2 and isolating transformer T1.
Further, transient voltage strike, the superpotential that causes of being such as struck by lightning is impacted, the surge of line voltage and peak voltage, some consumer produce spike disturbing pulse, industrial spark, and static discharge voltage etc., destruction and interference effect can be played to Circuits System, therefore, zinc oxide varistor part is adopted to suppress transient voltage strike.
Further, bidirectional transient voltage suppressor TVS pipe F2 is utilized to suppress the surge voltage in passband.
Further, TS1 is the Schottky stabilivolt of a 20V, and the present embodiment mainly utilizes the feature that its forward conduction voltage is low; the metal-oxide-semiconductor of protection P raceway groove; consider the reliability of product, voltage stabilizing diode can be selected to select 1N5817 or SS12, or there is the diode of more low forward conduction voltage.
Further, resistance R7 is used for protecting carrier chip.Due to carrier chip employing is MOSFET technique, and the input of amplifying circuit is capacitive, and the resistance of the 0.22k that therefore connects protects carrier chip.
Further, described carrier communication interface circuit adopts transformer-supplied.US6M2 inside has the metal-oxide-semiconductor of a P raceway groove and the metal-oxide-semiconductor of a N raceway groove; the resistance to stream of P raceway groove is 1A; the resistance to stream of N raceway groove is 1.5A; this just makes the resistance to stream of whole carrier current channel be 1A; so the power supplying the power supply of this amplifying circuit can not be too large; if the power that power supply provides is very large; when the impedance in the external world is very little; just have big current and flow through US6M2; when exceeding its ratings, likely US6M2 can be burnt, therefore; for protection US6M2, carrier communication circuit adopts transformer-supplied.
Current communication modes is a lot, also can adopt as the various ways such as GPRS, CDMA, Personal Handyphone System communication, optical-fibre communications, bluetooth communication, MBUS communication, telephone wire MODEN communication, CAM, USB communication.
Fig. 6 is the power circuit diagram that the utility model embodiment provides, power circuit described in the utility model has the low series connection linear power supply of reliability high electromagnetic interference (EMI) low power consumption that two-way exports, comprise secondary have power transformer F1 that two-way exports, with the thermistor RVT3 of described F1 primary series, voltage dependent resistor (VDR) MOV1, rectifier bridge, three-terminal voltage-stabilizing circuit, the filtering circuit with described F1 primary parallel.
Power circuit is the elementary RVT3 that first connects at F1 for superpotential design protection, then MOV1 in parallel.The electrical resistance voltage of MOV1 increases and reduces; the shunt of a low-resistance is formed at overvoltage moment MOV1; at this moment the thermistor resistance that is rapidly heated because of overcurrent becomes and finally forms open circuit greatly, and protection transformer both end voltage can not rise further, protects subsequent conditioning circuit.F1 time level has two-way to export, one tunnel supply primary power uses, another road is specialized in and is used to network communication interface circuit (for RS485 interface circuit), such design can ensure the collapse that can not cause whole power supply when RS485 interface is attacked by forceful electric power, and metering circuit can also normally work.
The utility model adopts above-mentioned series-connection power supplies to have, and cost is low, the life-span long, the advantage of anti-high frequency interference.
The ic for energy metering of the present embodiment comprises:
To the voltage sampling circuit that input voltage is sampled, voltage sampling circuit figure as shown in Figure 7a;
To the first current sampling circuit that input current is sampled, the first current sampling circuit figure as shown in Figure 7b;
To the second current sampling circuit that input current is sampled, the first current sampling circuit figure as shown in Figure 7 c;
Connect the electric energy computation chip of signal output part of described voltage sampling circuit, the first and second current sampling circuits, electric energy computation chip circuit diagram as shown in figure 7d, wherein, ic for energy metering selects high precision electric energy metrical special chip ATT7053, and it can ensure measuring accuracy and the linearity under complex environment condition.
Fig. 8 is the microcontroller circuit figure that the utility model embodiment provides, and as shown in Figure 8, described microprocessor adopts chip PIC18F86J90.Described PIC18F86J90 carries out digital communication by spi bus and electric energy computation chip, reads the electric quantity data on computation chip and electrical network analog parameter, and it analyzed, process, store, communication, display to be to realize the intellectuality of ammeter.
Specifically, its pin 37 (485_R1) is connected with network communication interface circuit (such as RS485 communication), electric line carrier communication circuit with pin 38 (485_T1), its pin 6 (TXH) is connected infra red communication port circuit with pin 7 (RXH), and pin 39 (DI), pin 40 (DO), pin 41 (CS), pin 42 (CL), pin 46 (CON_3.3) are connected with ATT7053AU.
Further, described single-phase electric energy meter also comprises: what be connected with described microprocessor-based control output terminal forfeits electric control circuit, and it comprises:
What be connected with described microprocessor-based control output terminal is used for receiving the relay drive circuit forfeiting electric control signal;
The magnetic latching relay being used for being switched on or switched off input power be connected with the output terminal of described relay drive circuit;
What be connected with described magnetic latching relay is used for the feedback of status of described magnetic latching relay to the state-feedback circuit of described microprocessor.
Fig. 9 is the relay drive circuit figure that the utility model embodiment provides, as shown in Figure 9, electric control "ON" transmission mouth (i.e. one end CTR_ON of resistance R63) of forfeiting of relay drive circuit connects the pin 36 of microprocessor, and the electric control "Off" of forfeiting of relay drive circuit transmits the pin 35 that mouth (i.e. one end CTR_OFF of resistance R66) connects microprocessor.
The advantage of described magnetic latching relay is energy-conservation, only when changing on off operating mode action once, the maintenance of state is completed by physical construction, no longer consumes energy.MCU sends pulse signal, drives the actuating of relay by relay drive circuit, feedback circuit by the feedback of status of relay to MCU.If the incorrect MCU of state will send second time driving pulse, if state remains unchanged, incorrect MCU will send out alerting signal to main website.
Except foregoing circuit, the utility model also comprises the circuit commons such as clock circuit, liquid crystal display circuit, data storage circuitry.
Further, the utility model also comprises the WI-FI wireless communication module with communications protocol translation function, it is not when revising electric energy meter program, still can realize and the interconnecting of the concentrator of different stipulations (acquisition system), as long as replacing communication module, communication modes that just can be compatible external.Specifically, described WI-FI wireless communication module comprises antenna, wireless receiving and radiating circuit, WI-FI control chip, single-chip microcomputer, UART serial interface circuit and power circuit.The radio signal that this module is sent by antenna, wireless receiving and radiating circuit reception concentrator, WI-FI control chip by be transferred to after signal resolution single-chip microcomputer, single-chip microcomputer by communications protocol change after through UART interface and electric energy meter communication, realize the data communication of electric energy meter and teletransmission data concentrator.Similarly, single-chip microcomputer receives electric energy meter data through UART interface, and sends to WI-FI control chip after communications protocol being changed, and sends to concentrator finally by by wireless receiving and radiating circuit, antenna.
In sum, the utility model has following technique effect:
The utility model can meet multi-functional, the networking of China national grid requirements, intelligentized requirement, it is all new generation single-phase intelligent electric energy meter, realize accurate measurement, automatic data logging (data can networking transmitted in both directions), thus realize the control of intelligent rate, meet the billing requirements of tou power price and gradient electricity price.
Although be described in detail the utility model above, the utility model has been not limited thereto, and those skilled in the art of the present technique can carry out various amendment according to principle of the present utility model.Therefore, all amendments done according to the utility model principle, all should be understood to fall into protection domain of the present utility model.

Claims (10)

1. a single-phase electric energy meter, comprising:
Be used to provide the power circuit of working power;
Be used for the ic for energy metering using electric energy to measure to user;
Microprocessor, its data input pin connects the data output end of described ic for energy metering;
Infra red communication port circuit, it connects the infrared input/output terminal of described microprocessor;
Network communication interface circuit, it connects the network input/output terminal of described microprocessor;
It is characterized in that, described network communication interface circuit comprises:
Be used for realizing the first photoelectrical coupler of electrical isolation, its output terminal is connected with the network input of described microprocessor;
Be used for realizing the second photoelectrical coupler of electrical isolation, its input end is connected with the network output of described microprocessor;
Network transceivers, its receiver output terminal connects the input end of described first photoelectrical coupler, and its driver input end connects the output terminal of described second photoelectrical coupler;
TVS diode, is connected between the homophase input/output terminal of described network transceivers and reverse input/output terminal;
First thermistor, its one end connects the homophase input/output terminal of described network transceivers;
Second thermistor, its one end connects the anti-phase input output terminal of described network transceivers;
Network communication interface connector, connects the other end of described first thermistor and described second thermistor.
2. single-phase electric energy meter according to claim 1, is characterized in that, described power circuit is the series connection linear power supply with two-way output.
3. single-phase electric energy meter according to claim 2, is characterized in that, described series connection linear power supply comprises:
The secondary power transformer that there is two-way and export, wherein described in a road direction, network communication interface circuit provides independent current source;
With the 3rd thermistor of described power transformer primary series;
With the first voltage dependent resistor (VDR) of described power transformer primary parallel.
4. single-phase electric energy meter according to claim 1, is characterized in that, described ic for energy metering comprises:
To the current sampling circuit that input current is sampled;
To the voltage sampling circuit that input voltage is sampled;
Connect the electric energy computation chip of the signal output part of described current sampling circuit and voltage sampling circuit.
5. single-phase electric energy meter according to claim 4, is characterized in that, described electric energy computation chip adopts special chip ATT7053.
6. single-phase electric energy meter according to claim 1, is characterized in that, described microprocessor adopts chip PIC18F86J90.
7. single-phase electric energy meter according to claim 1, is characterized in that, described single-phase electric energy meter also comprises:
Electric line carrier communication circuit, it connects the power line carrier input/output terminal of described microprocessor.
8. single-phase electric energy meter according to claim 1, is characterized in that, described electric line carrier communication circuit comprises carrier communication chip PLCi38-III.
9. the single-phase electric energy meter according to claim 1-8 any one, is characterized in that, described single-phase electric energy meter also comprises:
What be connected with described microprocessor-based control output terminal forfeits electric control circuit.
10. single-phase electric energy meter according to claim 9, is characterized in that, described electric control circuit of forfeiting comprises:
What be connected with described microprocessor-based control output terminal is used for receiving the relay drive circuit forfeiting electric control signal;
The magnetic latching relay being used for being switched on or switched off input power be connected with the output terminal of described relay drive circuit;
What be connected with described magnetic latching relay is used for the feedback of status of described magnetic latching relay to the state-feedback circuit of described microprocessor.
CN201420438079.1U 2014-08-06 2014-08-06 A kind of single-phase electric energy meter Expired - Fee Related CN204142835U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107424402A (en) * 2017-09-13 2017-12-01 杭州乾龙电器有限公司 The carrier module that can be communicated with external equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107424402A (en) * 2017-09-13 2017-12-01 杭州乾龙电器有限公司 The carrier module that can be communicated with external equipment

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