CN206235646U - Electric energy meter - Google Patents
Electric energy meter Download PDFInfo
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- CN206235646U CN206235646U CN201621377538.5U CN201621377538U CN206235646U CN 206235646 U CN206235646 U CN 206235646U CN 201621377538 U CN201621377538 U CN 201621377538U CN 206235646 U CN206235646 U CN 206235646U
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Abstract
A kind of electric energy meter, including power subsystem, treatment and metering units and electromagnetic relay unit, the electromagnetic relay unit are used to control the break-make between ac output end and ac input end；Also include：Output end voltage detection unit, for detecting the voltage on ac output end, and gives the treatment and metering units by detection signal；Wherein, the detection signal is that frequency is the square-wave signal of power frequency, and its dutycycle is linear with the voltage exchanged in output, and the treatment can determine whether there is stealing with metering units according to the detection signal.The anti-electricity-theft detection means of the utility model is practical, can well safeguard normal supply order.
Description
Technical field
The utility model is related to electric energy meter, more particularly, to the thief-proof electro-detection of electric energy meter.
Background technology
Electric energy meter abbreviation electric energy meter.Electric energy meter is the instrument for measuring electric energy, is used for metering user
The device of how many electric energy, is also foundation that power supply enterprise collects the electricity charge.Therefore, the use electric energy that user must be legitimate.Together
When, user also has not stealing and supervises the obligation of other electricity filching behaviors.
For a long time, some personal or enterprises, using theft electric energy as profit means, take various methods to disregard or few
Quantity calculation, to reach the purpose do not handed over or pay tariff less.This seriously compromises the legitimate rights and interests of power supply enterprise, has upset normal
Supply order, had a strong impact on the development of electric utility, and serious threat is brought to safety utilization of electric power.However, existing electricity
Energy table often lacks effective anti-electricity-theft detection means, for example：Although by installing voltage/current transformer, can be well
Electricity filching behavior is detected, so because its cost is too high, and is difficult to try out.
Utility model content
Technical problem to be solved in the utility model is to overcome the shortcomings of existing for above-mentioned prior art, and proposes one
Electric energy meter is planted, anti-electricity-theft detection means is practical, can well safeguard normal supply order.
The utility model proposes a kind of electric energy meter, including power subsystem, treatment and metering units for above-mentioned technical problem
With electromagnetic relay unit, the electromagnetic relay unit is for controlling the break-make between ac output end and ac input end；Also
Including：Output end voltage detection unit, for detecting the voltage on ac output end, and gives the treatment with meter by detection signal
Amount unit；Wherein, the detection signal is that frequency is the square-wave signal of power frequency, and its dutycycle is linear with the voltage exchanged in output
Relation, the treatment can determine whether there is stealing with metering units according to the detection signal.
In certain embodiments, the output end voltage detection unit is by resistor voltage divider circuit, current amplification circuit and isolation
Circuit is constituted.
In certain embodiments, the resistor voltage divider circuit includes being attempted by between the live wire of the ac output end and zero line
Multiple resistance, the resistance of some of them resistance is larger, and for realizing that high resistant is isolated, the resistance of wherein other resistance is smaller, uses
In acquisition detection voltage.
In certain embodiments, these are used to realize the resistance of high resistant isolation from for hundreds of kilohms, and these are used to obtain
The resistance of detection voltage is taken from for several kilohms.
In certain embodiments, the main PNP triode Q2 and a NPN by mutually concatenating of the current amplification circuit
Triode Q1 is constituted；Wherein, the base stage of PNP triode Q2 is connected with the output of the resistor voltage divider circuit, PNP triode Q2
Emitter stage connect the first power supply ground, the colelctor electrode of PNP triode Q2 is connected with the base stage of the NPN triode Q1, the poles of NPN tri-
The emitter stage of pipe Q1 connects the first power supply, and the colelctor electrode of the NPN triode Q1 drives the main side of the isolation circuit.
In certain embodiments, the secondary circuit of the isolation circuit is powered using second source, the second source with this
One power supply is isolated.
In certain embodiments, the isolation circuit is photoelectrical coupler, and the main side of the isolation circuit corresponds to the light thermocouple
The luminous tube side of clutch, the secondary of the isolation circuit corresponds to the light receiving tube side of the photoelectrical coupler.
In certain embodiments, the electric energy meter also includes communication unit, for being communicated with external equipment.
Compared with prior art, electric energy meter of the present utility model is by dexterously setting output end voltage detection unit, energy
It is enough that voltage on the ac output end by electromagnetic relay cell isolation is detected, and detection signal is reported at this
Reason and metering units, are determined with the presence or absence of stealing in time by the treatment and metering units, and anti-electricity-theft detection means is practical,
Normal supply order can well be safeguarded.
Brief description of the drawings
Fig. 1 illustrates the circuit block diagram of electric energy meter of the present utility model and the electrical schematic diagram of output end voltage detection unit.
Fig. 2 illustrates the electrical schematic diagram of power subsystem of the present utility model.
Specific embodiment
Below in conjunction with the accompanying drawing of this specification, further elaboration is given to preferred embodiment of the present utility model.
Referring to Fig. 1, Fig. 1 illustrates the circuit block diagram of electric energy meter of the present utility model and the electricity of output end voltage detection unit
Schematic diagram.The utility model proposes a kind of electric energy meter 100, it is generally comprised：Power subsystem 10, for being provided directly for other units
Stream power supply；Treatment and metering units 20, for realizing metering and necessary treatment；Communication unit 30, for entering with external equipment
Row communication；Electromagnetic relay unit 40, for control ac output end L_out, N_out and ac input end L_in, N_in it
Between break-make；And output end voltage detection unit 50, for detecting the voltage on ac output end L_out, N_out, and will
Detection signal TO_mcu gives the treatment and metering units 20.
Specifically, the ground of the treatment and metering units 20（GND）Connected together with the live wire L_in of ac input end.When
When electromagnetic relay unit 40 is in "on" position, fire wire output end L_out is with ground（GND）It is connected together.Work as electromagnetic relay
When unit 40 is in disconnected lock state, fire wire output end L_out is floating state, makes ac output end L_out, N_out with this
Without reference point between reason and metering units 20, the voltage in Sample AC output end L_out, N_out is at this moment difficult to.
The output end voltage detection unit 50 can realize thief-proof electro-detection, and its operation principle is substantially：Under normal circumstances,
When being off when electromagnetic relay unit 40 is controlled, on ac output end L_out, N_out（Namely the exchange of user
On supply lines）Should be no voltage.Once there is electricity filching behavior, namely：Artificially get around the electromagnetic relay unit 40
Disconnection control, if ac output end L_out, N_out short circuit corresponding with ac input end L_in, N_in, exchange export
L_out, N_out are equivalent to ac input end L_in, N_in at end, there is electric main on ac output end L_out, N_out.This
When, corresponding detection signal TO_mcu can be provided by the output end voltage detection unit 50, notify at once to this
Treatment and metering units 20, the treatment can in time judge whether stealing with metering units 20, and can be by the communication
Unit 30 reports the presence of electricity filching behavior in time, in order to power supply enterprise's treatment of reply in time.
Specifically, the output end voltage detection unit 50 by resistance R17, R18, R22, R26, R27, R17, R19, R23,
R16, R21, R24, R25 and R20, electric capacity C11, diode D4, NPN triode Q2, PNP triode Q1, and photoelectrical coupler
U4 is constituted.
Resistance R17, R18, R22, R26 and R27 are connected in parallel on the ac output end L_out, N_out by after series connection.Electricity
Resistance R17, R18, R26 and R27 resistance is larger, in the present embodiment, from being hundreds of kilohms, is capable of achieving high resistant isolation.Resistance
R22 resistances are smaller, and in the present embodiment, from being several kilohms, it constitutes bleeder circuit with resistance R17, R18, R26 and R27,
For obtaining detection voltage.
Diode D4 is connected in reverse parallel on resistance R22.With resistance R22's after the base stage series resistor R19 of NPN triode Q2
One end is connected.The emitter stage of NPN triode Q2 is connected with the other end of resistance R22.The emitter stage of NPN triode Q2.Resistance R23
It is connected in parallel between the base stage of NPN triode Q2 and emitter stage.
In this way, one end of the emitter stage and resistance R24 of the anode of diode D4 and triode Q2 connects isolator ISO_GND
（That is the ground of power supply ISO_5V）.Resistance R17, R18, R26, R27 series connection partial pressure obtain a small voltage signal, go to drive NPN
Triode Q2.Diode D4 is the emitter junction protection diode of NPN triode Q2.
Resistance R16 is connected across between the base stage of the colelctor electrode of NPN triode Q2 and PNP triode Q1.PNP triode Q1's
Emitter stage meets power supply ISO_5V.1 pin of the colelctor electrode connection photoelectrical coupler U4 of PNP triode Q1（That is the positive pole of luminous tube）,
2 pin of photoelectrical coupler U4（That is the negative pole of luminous tube）Connection resistance R24.Resistance R21 be connected to photoelectrical coupler U4 1 pin and
Between 2 pin.
In this way, after PNP triode Q1 is by the Current amplifier of NPN triode Q2, go to drive the luminous tube of photoelectrical coupler U4,
The secondary of photoelectrical coupler U4（That is light receiving tube）The square-wave signal that will be received passes to the treatment and is processed with metering units 20.
It is understood that the output end voltage detection unit 50 is by resistor voltage divider circuit, current amplification circuit and isolation
Circuit is constituted.Wherein, the resistor voltage divider circuit is made up of resistance R17, R18, R22, R26 and R27.The current amplification circuit is main
It is made up of the PNP triode Q2 and NPN triode Q1 that mutually concatenate.The isolation circuit is photoelectrical coupler U4.
Emulated by the output end voltage detection unit 50, it can be found that：For the output end electricity of different amplitudes
Pressure（That is upper voltages of ac output end L_out, N_out）, the detection signal TO_mcu that photoelectrical coupler U4 is given is with difference
The square wave of dutycycle, the frequency of the square wave is power frequency（50HZ）.Therefore, the treatment can be received with metering units 20 by recognizing
The dutycycle of the square-wave signal for arriving, the anti-voltage released on ac output end L_out, N_out.
It can be seen that, by dutycycle one magnitude of voltage of correspondence, the utility model can be realized to output end voltage more
Accurate detection, and then realize the anti-stealing electricity function based on electric energy meter output end.
With reference to referring to Fig. 2, Fig. 2 is the electrical schematic diagram of power subsystem of the present utility model.In the present embodiment, the power supply list
Unit 10 provides three groups of mutually isolated dc sources.Wherein ,+15V is supplied to treatment and metering units 20, the ground of+15V（GND）
It is connected with the live wire L_in for exchanging input, is non-isolated state；5V is supplied to communication unit 30；ISO_5V is supplied to the light thermocouple
The main side circuit of clutch the U4 ,+3.3V that the secondary circuit of photoelectrical coupler U4 is then obtained by+15V conversion powers, in this way, can
To realize that the high resistant between the detection input of the output end voltage detection unit 50 and detection output is isolated.
It is noted that the treatment includes MCU with metering units 20, the judgement of stealing is by running on the MCU
Program make.In the present embodiment, the communication unit 30 can support that RS485 communicates；In other embodiments, the communication
Unit 30 can support power line carrier communication, and/or, various wired, wireless means of communication such as mobile telephone network communication.
To sum up, the utility model proposes a kind of anti-electricity-theft detection method of electric energy meter, to by electromagnetic relay unit 40
Voltage on the ac output end of isolation is detected, if electromagnetic relay unit 40 is off, and the treatment and meter
Amount unit 20 is able to detect that on the at this moment ac output end confession that there is setting voltage by output end voltage detection unit 50
Give, then judge there is stealing.
Specifically, the voltage on ac output end is detected, the detection signal TO_mcu for obtaining is its dutycycle
The square-wave signal linear with magnitude of voltage, the frequency of the square-wave signal is power frequency.
Compared with prior art, electric energy meter of the present utility model 100 is by dexterously setting output end voltage detection unit
50, the voltage on the ac output end isolated by electromagnetic relay unit 40 can be detected, and by detection signal TO_
Mcu is reported to treatment and metering units 20, determined with the presence or absence of stealing in time by the treatment and metering units 20, thief-proof electric-examination
Survey means are practical, can well safeguard normal supply order.
The above is only preferred embodiment of the present utility model, is not intended to limit embodiment of the present utility model,
Those of ordinary skill in the art can very easily carry out corresponding accommodation according to central scope of the present utility model and spirit
Or modification, therefore protection domain of the present utility model should be defined by the protection domain required by claims.
Claims (8)
1. a kind of electric energy meter, including power subsystem, treatment and metering units and electromagnetic relay unit, the electromagnetic relay unit
For controlling the break-make between ac output end and ac input end；Characterized in that, also including：Output end voltage detection is single
Unit, for detecting the voltage on ac output end, and gives the treatment and metering units by detection signal；Wherein, detection letter
Number for frequency be the square-wave signal of power frequency, its dutycycle is linear with voltage on ac output end, the treatment with measure
Unit can determine whether there is stealing according to the detection signal.
2. according to the electric energy meter described in claim 1, it is characterised in that the output end voltage detection unit is by electric resistance partial pressure electricity
Road, current amplification circuit and isolation circuit are constituted.
3. according to the electric energy meter described in claim 2, it is characterised in that the resistor voltage divider circuit includes being attempted by exchange output
Multiple resistance between the live wire and zero line at end, the resistance of some of them resistance is larger, for realizing that high resistant is isolated, wherein another
The resistance of a little resistance is smaller, for obtaining detection voltage.
4. according to the electric energy meter described in claim 3, it is characterised in that it is several that these are used to realize that the resistance of high resistant isolation is selected
Hundred kilohms, these are used to obtain the resistance of detection voltage from for several kilohms.
5. according to the electric energy meter described in claim 2, it is characterised in that main by mutually concatenating of the current amplification circuit
PNP triode Q2 and a NPN triode Q1 composition；Wherein, the base stage of PNP triode Q2 is defeated with the resistor voltage divider circuit
Go out connected, the emitter stage of PNP triode Q2 connects the first power supply ground, colelctor electrode and the NPN triode Q1 of PNP triode Q2
Base stage be connected, the emitter stage of the NPN triode Q1 connects the first power supply, and the colelctor electrode of the NPN triode Q1 drives isolation electricity
The main side on road.
6. according to the electric energy meter described in claim 5, it is characterised in that the secondary circuit of the isolation circuit is supplied using second source
Electricity, the second source is isolated with first power supply.
7. according to the electric energy meter described in claim 6, it is characterised in that the isolation circuit is photoelectrical coupler, the isolation circuit
Main side correspond to the luminous tube side of the photoelectrical coupler, the light that the secondary of the isolation circuit corresponds to the photoelectrical coupler connects
Closed tube side.
8., according to the electric energy meter described in any one of claim 1 to 7, it is characterised in that the electric energy meter also includes communication unit, use
Communicated in external equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621377538.5U CN206235646U (en) | 2016-12-15 | 2016-12-15 | Electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621377538.5U CN206235646U (en) | 2016-12-15 | 2016-12-15 | Electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206235646U true CN206235646U (en) | 2017-06-09 |
Family
ID=58992099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621377538.5U Active CN206235646U (en) | 2016-12-15 | 2016-12-15 | Electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206235646U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226593A (en) * | 2016-12-15 | 2018-06-29 | 成都长城开发科技有限公司 | Electric energy meter and its anti-electricity-theft detection method |
| CN109861197A (en) * | 2019-03-08 | 2019-06-07 | 武汉市路灯管理服务中心 | Anti- alternating current grid-connecting apparatus for DC power-supply system |
-
2016
- 2016-12-15 CN CN201621377538.5U patent/CN206235646U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226593A (en) * | 2016-12-15 | 2018-06-29 | 成都长城开发科技有限公司 | Electric energy meter and its anti-electricity-theft detection method |
| CN108226593B (en) * | 2016-12-15 | 2024-04-19 | 成都长城开发科技股份有限公司 | Electric energy meter and electricity larceny prevention detection method thereof |
| CN109861197A (en) * | 2019-03-08 | 2019-06-07 | 武汉市路灯管理服务中心 | Anti- alternating current grid-connecting apparatus for DC power-supply system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee after: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. Address before: 611731 no.1218, Hezuo Road, high tech Zone (West District), Chengdu, Sichuan Province Patentee before: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee after: Chengdu Great Wall Development Technology Co.,Ltd. Address before: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee before: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. |