CN2781382Y - Seingle-phase electric energy meter with device for preventing electric burglary - Google Patents
Seingle-phase electric energy meter with device for preventing electric burglary Download PDFInfo
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- CN2781382Y CN2781382Y CN 200520008683 CN200520008683U CN2781382Y CN 2781382 Y CN2781382 Y CN 2781382Y CN 200520008683 CN200520008683 CN 200520008683 CN 200520008683 U CN200520008683 U CN 200520008683U CN 2781382 Y CN2781382 Y CN 2781382Y
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Abstract
The utility model relates to a single-phase electricity stealing preventing electric energy meter which belongs to the manufacturing field of electric energy meters. A power supply input terminal of a power supply managing module is respectively connected with an AC fire line, an AC zero line, a power supply current transformer and a battery, and an output terminal of the power supply managing module is connected with a power supply terminal of a single-chip microcomputer MSP430FE42X. A signal output terminal of a current unbalance testing circuit is connected with a current sampling signal input terminal of the single-chip microcomputer MSP430FE42X. A signal output terminal of an electricity stealing preventing testing circuit is connected with the current sampling signal input terminal of the single-chip microcomputer MSP430FE42X. Asignal output terminal of a voltage testing circuit is connected with a voltage sampling signal input terminal of the single-chip microcomputer MSP430FE42X. In the single-chip microcomputer MSP430FE42X, a driving module is connected with an LCD display, and a hardware universal asynchronous / synchronous receiving and sending module is connected with a communication interface and a pulse output interface for correcting the electric energy meter and metering.
Description
Technical field:
The utility model relates to a kind of anti-electricity-theft electric energy meter, belongs to electric energy meter and makes the field.
Background technology:
Patent No. ZL96214677.3, title " anti-electricity-theft electric energy meter ", anti-electricity-theft electric energy meter belongs to electric energy metrical, recorder, be to Voltag driving circuit in the plain edition induction energy meter, current driving circuit has been done perfect improvement, and adopt current detection circuit and control circuit to constitute, thereby reach multi-faceted anti-electricity-theft function, it is rational in infrastructure, dependable performance, any electricity filching behavior is quick on the draw, be normal metering electric energy meter at ordinary times, electric energy meter was accelerated the meter degree when electricity filching behavior was arranged, stealing electricity phenomenon is punished, recover normal metering state when stopping stealing automatically.
Summary of the invention:
Purpose of design: designing a kind of one is when electric energy meter alternating current zero line ground connection or live wire short circuit, can carry out the anti-electricity-theft measurement and metrology of current imbalance effectively; The 2nd, when the turnover port of electric energy meter alternating current fire wire connects exchange, the anti-electricity-theft measurement and metrology in the time of can carrying out current reversal effectively; The 3rd, zero line or the live wire that electric energy meter is removed ammeter connect, when not having voltage signal to enter electric energy meter, the anti-electricity-theft measurement and metrology in the time of can removing principal voltage effectively.
Design proposal: one, design concept: the utility model adopts the design agents of the MSP430 of Texas Instrument series super low-power consumption controller as single-phase anti-electricity-theft electric energy meter, it adopts the chip of different peripheral modules to form at multiple different application, its structure combines with the pattern of five kinds of power consumptions, prolongs battery serviceable life.The MSP430FE42x series monolithic disposes three, and independently 16 ∑-Δ analog to digital converters and embedded signal are handled kernel (ESP430), are the microcontrollers that is used for the single-phase electric energy meter of measurements and calculations two wires or three-wire system, the super low-power consumption performance that cooperates MSP430, realization single-phase electric energy meter that can be more or less freely with inferior anti-electricity-theft measurement: the 1. anti-electricity-theft measurement during current imbalance: current imbalance is typically zero line ground connection or live wire short circuit; 2. the anti-electricity-theft measurement during current reversal: the turnover port that current reversal is typically live wire connects exchange; Anti-electricity-theft measurement when 3. removing principal voltage: remove principal voltage and be typically the zero line or the live wire connection of removing ammeter, do not have voltage signal to enter ammeter.Two, the single-phase anti-electricity-theft electric energy meter of project organization: MSP430FE42X can be realized more comprehensive anti-electricity-theft measurement, in conjunction with the anti-electricity-theft ammeter functional block diagram of Fig. 1 MSP430FE42X, the single-phase anti-electricity-theft electric energy meter of MSP430FE42X can be divided into following functional module: anti-electricity-theft multi-functional metering, power management, LCD demonstration, communication interface, pulse output, band temperature compensation real-time clock etc.1, anti-electricity-theft multi-functional metering: the present electric energy meter of multi-functional metered body can realize gaining merit, the measurement of idle, applied power, current effective value, voltage effective value, frequency, phase place etc.1. the anti-electricity-theft measurement during current imbalance: current imbalance comprises the unbalanced situation of the load current that measures of any live wire and zero line, and current imbalance is presented as zero line ground connection or live wire short circuit usually.Detect the imbalance of electric current, must additionally increase a current sensor, to realize the current detecting of zero line; Owing to isolating reason, can on the current channel of the first via, select copper-manganese resistance cheaply for use, but another road just must the higher relatively current transformer of use cost.In the anti-electricity-theft ammeter functional block diagram of Fig. 1 MSP430FE42X, the single-chip microcomputer MSP430FE42X of 24 ADC of built-in three independence carries out the sampling of two current channels (live wire, zero line) and a voltage channel, and in the size of current of single-chip microcomputer inter-process, two current channels of comparison, detection and anti-electricity-theft measurement when realizing current imbalance.The sensor of two current channels has been selected copper-manganese resistance summation current transformer respectively for use, and voltage channel adopts electric resistance partial pressure to realize.2. the anti-electricity-theft measurement during current reversal: transposing turnover line is the electricity filching behavior that electricity filching person is often taked, and the turnover port that current reversal is typically live wire connects exchange.MSP430FE42X electric energy metrical module can realize detecting the current reversal function, without any need for auxiliary element just can realize the detection of current reversal.Simultaneously, the processing mode when can preset current reverse, the absolute value of getting power or electric energy during as current reversal is measured value or the like, realizes the anti-electricity-theft measurement of current reversal.Anti-electricity-theft measurement when 3. removing principal voltage: remove principal voltage and show as and remove wherein one tunnel in the connection box of electric energy meter (live wire and zero line), usually electricity filching person removes zero line, make ammeter not have entering of line voltage, cause electric energy meter not have power supply, can not normally measure maybe and can not work.Tackle this electricity filching behavior, available one cheaply current transformer CT (the power supply CT among Fig. 1) electric current of from the lead of remaining connection ammeter, flowing through steal very little electric energy, through the processing of power management module,, make electric energy meter realize anti-electricity-theft measurement to the electric energy meter power supply.Because electric energy meter cost, the size of electric energy meter watchcase and the influence of the maximum current that electronic devices and components can bear, selection CT of stealing from the electric current is restricted, therefore can be also restricted to the electric energy of electric energy meter power supply from stealing on the electric current, special be that the electric energy that can steal from electric current is with not competent electric energy meter power supply when load current is very for a short time.Power supply department usually wishes just can realize during greater than 1A-2A when load current the anti-electricity-theft measurement of electric energy meter, and certainly for power supply department, this can realize that thief-proof electrometric load minimum current ultimate value is the smaller the better.Based on above requirement, need to select a scheme that power consumption is very little when removing the anti-electricity-theft measurement of principal voltage to guarantee finishing anti-electricity-theft measurement smoothly.So anti-electricity-theft measurement when cooperating the super low-power consumption characteristic of MSP430FE42X series monolithic and abundant AFE (analog front end) can more or less freely realization to remove principal voltage.2, power management: in the anti-electricity-theft ammeter functional block diagram of Fig. 1 MSP430FE42X, except that battery, the power supply of electric energy meter is supplied with had two steps to be grouped into, the one, the principal voltage of live wire and zero line provides power supply, another part is that power supply CT steals from electric current power supply is provided, so when removing principal voltage, the power supply that power supply CT steals from electric current still can be preserved electric energy meter work, carries out anti-electricity-theft measurement.Fig. 2 is the circuit diagram of power management.Power supply CT need also can drive electric energy meter work when little electric current.Usually when load current was 1A, a little CT provided and is equivalent to 1mA/3V, and this can realize anti-electricity-theft measurement for the MSP430FE42X single-chip microcomputer with the super low-power consumption that enriches AFE (analog front end).Remove the thief-proof electrometric load minimum current ultimate value of principal voltage if select for use bigger CT to reduce certainly, but this will increase the cost of power supply CT on the one hand, on the other hand, when load current is very big, the components and parts that power management is relevant will bear very big pressure, and might damage, to remove the thief-proof electrometric load current ultimate value of principal voltage be worthless so reduce with the method for selecting big CT for use.3, LCD shows: MSP430FE42x inside has lcd driver, maximum desirable moving demonstration 128 segment encodes, can well finish the LCD Presentation Function, need not to expand again lcd driver, link to each other as long as directly that each pin of liquid crystal is corresponding with MSP430FE42x LCD drives the pin of output.4, that communication interface: MSP430FE42x has hardware is universal asynchronous/and receive synchronously and send (USARTO) peripheral module, be used for serial data communication.The MSP430FE427x single-phase multifunctional electric energy meter can select optical communication interface, RS-232/RS-485 interface or both to have concurrently.5, pulse output: pulse output is used for calibration, metering, and impulse output circuit adds light-coupled isolation by common I/O and realizes that implementation is succinct.6, band temperature compensation real-time clock RTC: real-time clock RTC can be realized by the timer of MSP430 single-chip microcomputer inside.Built-in temperature sensor can be realized the measurement of temperature easily, realizes the temperature compensation to real-time clock RTC.
Technical scheme 1: single-phase anti-electricity-theft electric energy meter, it comprises watchcase, the power management module power input connects alternating current fire wire and zero line respectively, the supply current mutual inductor, battery, the power management module output terminal connects the power end of single-chip microcomputer MSP430FE42X, the signal output part of current imbalance testing circuit connects the input end that connects current sampling signal in the single-chip microcomputer of single-chip microcomputer MSP430FE42X, the signal output part of anti-electricity-theft testing circuit connects the input end of current sampling signal among the single-chip microcomputer MSP430FE42X, the signal output part of voltage detecting circuit connects voltage sampling signal input end among the single-chip microcomputer MSP430FE42X, and driver module connects LCD display among the single-chip microcomputer MSP430FE42X, hardware is universal asynchronous/receives sending module synchronously to connect the letter interface, the pulse output interface is used for calibration and metering.Its anti-electricity-theft metering method: after ammeter enters duty, judge at first whether external voltage exists, if there is not then the only real-time clock of retainer belt temperature compensation operation in external voltage, and the monitoring external voltage, in case external voltage exists, then electric energy meter switches to the anti-electricity-theft metering state of principal voltage that removes, and then judge that the line voltage effective value is whether greater than the minimum limit value of electrical network electrical network, if less than, then remain on the anti-electricity-theft metering state of principal voltage that removes, and whether the monitoring external voltage exists; If greater than, then switch to normal metering state, under normal metering state, monitor external voltage on the one hand, when external voltage does not exist, switch to the only state of real-time clock operation, on the other hand, if external voltage exists, then remain on normal metering state, and monitoring voltage effective value, the further duty of definite electric energy meter.
The utility model adopts the main body of MSP430FE42x series monolithic as anti-electricity-theft electric energy meter, not only structural design novelty, uniqueness, simple, practical, keep to the side and anti-electricity-theft measurement and metrology when having realized anti-electricity-theft measurement and metrology, the current reversal of current imbalance effectively and the anti-electricity-theft measurement and metrology when removing principal voltage.
Description of drawings:
Fig. 1 is the anti-electricity-theft ammeter functional block diagram of MSP430FE42X.
Fig. 2 is the circuit diagram of power management.
Fig. 3 is the anti-electricity-theft measurement process flow diagram of the single-phase anti-electricity-theft electric energy meter of MSP430FE42X.
Embodiment:
Embodiment 1: with reference to accompanying drawing 1～2.Single-phase anti-electricity-theft electric energy meter, it comprises watchcase, the power management module power input connects alternating current fire wire and zero line, supply current mutual inductor, battery respectively, the power management module output terminal connects the power end of single-chip microcomputer MSP430FE42X, 24 ADC of built-in three independences among the single-chip microcomputer MSP430FE42X.The signal output part of current imbalance testing circuit connects the input end that connects current sampling signal in the single-chip microcomputer of single-chip microcomputer MSP430FE42X, the current signal sampling end of current imbalance testing circuit connects the two ends of shunt resistance respectively, shunt resistance is serially connected on the alternating current zero line, and the current signal of current imbalance testing circuit sampling output terminal connects the input end of current sampling signal among the single-chip microcomputer MSP430FE42X.The signal output part of anti-electricity-theft testing circuit connects the input end of current sampling signal among the single-chip microcomputer MSP430FE42X, anti-electricity-theft testing circuit is made of current transformer and sample circuit, current transformer is enclosed within on the single-phase AC electric wire, its output terminal is connected with the input end of sample circuit, and the output terminal of sample circuit connects the input end of current sampling signal among the single-chip microcomputer MSP430FE42X.The signal output part of voltage detecting circuit connects voltage sampling signal input end among the single-chip microcomputer MSP430FE42X, and the voltage detecting end of alternating current voltage testing circuit joins with alternating current fire wire and zero line respectively, voltage signal output end connects voltage sampling signal input end among the single-chip microcomputer MSP430FE42X.That driver module connects LCD display, hardware among the single-chip microcomputer MSP430FE42X is universal asynchronous/receive synchronously that sending module is connected the letter interface, the pulse output interface is used for calibration and metering.The power input of power management module joins with the live wire and the zero line of single-phase alternating current respectively, and the supply current mutual inductor is enclosed within on the single-phase AC electric wire, the signal input part of the output termination power management module of its current detection signal.The principle of work of MSP430FE42X anti-electricity-theft electric energy meter has two joints: external voltage (line voltage, power supply CT produces or both concur), voltage effective value.When external voltage did not exist, ammeter only kept RTC operation and LCD to show at sleep state.Externally under the situation that voltage exists, if voltage effective value, thinks then that line voltage exists greater than the minimum limit value (as 80V) of line voltage, electric energy meter is at normal metering state, by the actual measured value metering of current return and voltage circuit; If voltage effective value is less than the minimum limit value (as 80V) of line voltage, think that then line voltage does not exist, enter remove the anti-electricity-theft measurement state of principal voltage this moment, and voltage is as the criterion with this regional rated voltage, and electric current is as the criterion with the actual measured value of current return and measures.
Embodiment 2: with reference to accompanying drawing 3: the anti-electricity-theft metering method of single-phase anti-electricity-theft electric energy meter, after ammeter enters duty, judge at first whether external voltage exists, if there is not then the only real-time clock of retainer belt temperature compensation operation in external voltage, and monitoring external voltage, in case external voltage exists, then electric energy meter switches to the anti-electricity-theft metering state of principal voltage that removes, and then judge that the line voltage effective value is whether greater than the minimum limit value of electrical network electrical network, if less than, then remain on the anti-electricity-theft metering state of principal voltage that removes, and whether the monitoring external voltage exists; If greater than, then switch to normal metering state, under normal metering state, monitor external voltage on the one hand, when external voltage does not exist, switch to the only state of real-time clock operation, on the other hand, if external voltage exists, then remain on normal metering state, and monitoring voltage effective value, the further duty of definite electric energy meter.The stealing from current return of supply current mutual inductor provides the ammeter working power.
What need understand is: though the foregoing description is to the utility model detailed explanation of contrasting, but these explanations are just illustrative, rather than to restriction of the present utility model, any innovation and creation that do not exceed in the utility model connotation all fall in the protection domain of the present utility model; Secondly, the application's emphasis has been narrated based on the low power capabilities of MSP430FE42X and the anti-stealing electricity function of the anti-electricity-theft electric energy meter of the characteristics of enriching such as AFE (analog front end), its said single-phase anti-electricity-theft electric energy meter is to add anti-stealing electricity function on normal single-phase multifunctional, multi-rate electric energy meter, so the single-phase anti-electricity-theft electric energy meter of MSP430FE42X can be the form of single-phase multifunctional table, also can be the form of single-phase many rates and other electric energy meter form.
Claims (7)
1, a kind of single-phase anti-electricity-theft electric energy meter, it comprises watchcase, it is characterized in that: the power management module power input connects alternating current fire wire and zero line respectively, the supply current mutual inductor, battery, the power management module output terminal connects the power end of single-chip microcomputer MSP430FE42X, the signal output part of current imbalance testing circuit connects the input end that connects current sampling signal in the single-chip microcomputer of single-chip microcomputer MSP430FE42X, the signal output part of anti-electricity-theft testing circuit connects the input end of current sampling signal among the single-chip microcomputer MSP430FE42X, the signal output part of voltage detecting circuit connects voltage sampling signal input end among the single-chip microcomputer MSP430FE42X, and driver module connects LCD display among the single-chip microcomputer MSP430FE42X, hardware is universal asynchronous/receives sending module synchronously to connect the letter interface, the pulse output interface is used for calibration and metering.
2, single-phase anti-electricity-theft electric energy meter according to claim 1, it is characterized in that: the power input of power management module joins with the live wire and the zero line of single-phase alternating current respectively, the supply current mutual inductor is enclosed within on the single-phase AC electric wire, the signal input part of the output termination power management module of its current detection signal.
3, single-phase anti-electricity-theft electric energy meter according to claim 1, it is characterized in that: the current signal sampling end of current imbalance testing circuit connects the two ends of shunt resistance respectively, shunt resistance is serially connected on the alternating current zero line, and the current signal of current imbalance testing circuit sampling output terminal connects the input end of current sampling signal among the single-chip microcomputer MSP430FE42X.
4, single-phase anti-electricity-theft electric energy meter according to claim 1, it is characterized in that: anti-electricity-theft testing circuit is made of current transformer and sample circuit, current transformer is enclosed within on the single-phase AC electric wire, its output terminal is connected with the input end of sample circuit, and the output terminal of sample circuit connects the input end of current sampling signal among the single-chip microcomputer MSP430FE42X.
5, single-phase anti-electricity-theft electric energy meter according to claim 1 is characterized in that: the voltage detecting end of alternating current voltage testing circuit joins with alternating current fire wire and zero line respectively, voltage signal output end connects voltage sampling signal input end among the single-chip microcomputer MSP430FE42X.
6, single-phase anti-electricity-theft electric energy meter according to claim 1 is characterized in that: 24 ADC of built-in three independences among the single-chip microcomputer MSP430FE42X.
7, single-phase anti-electricity-theft electric energy meter according to claim 1 is characterized in that: the stealing from current return of supply current mutual inductor provides the ammeter working power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520008683 CN2781382Y (en) | 2005-03-25 | 2005-03-25 | Seingle-phase electric energy meter with device for preventing electric burglary |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520008683 CN2781382Y (en) | 2005-03-25 | 2005-03-25 | Seingle-phase electric energy meter with device for preventing electric burglary |
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| CN2781382Y true CN2781382Y (en) | 2006-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200520008683 Expired - Fee Related CN2781382Y (en) | 2005-03-25 | 2005-03-25 | Seingle-phase electric energy meter with device for preventing electric burglary |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100378461C (en) * | 2005-03-25 | 2008-04-02 | 杭州利尔达单片机技术有限公司 | Single phase electric larceny preventing electricity meter and method for preventing electric larceny |
| CN102072978A (en) * | 2011-01-25 | 2011-05-25 | 武汉盛帆电子股份有限公司 | Single-phase double-circuit manganese copper metering anti-theft electric charge-controlled intelligent electric energy meter |
| CN102298082B (en) * | 2009-03-10 | 2014-08-13 | 吴嘉懿 | Electricity-stealing prevention electric energy meter |
| CN105486918A (en) * | 2016-01-18 | 2016-04-13 | 广东美的暖通设备有限公司 | Electric quantity management method and system |
-
2005
- 2005-03-25 CN CN 200520008683 patent/CN2781382Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100378461C (en) * | 2005-03-25 | 2008-04-02 | 杭州利尔达单片机技术有限公司 | Single phase electric larceny preventing electricity meter and method for preventing electric larceny |
| CN102298082B (en) * | 2009-03-10 | 2014-08-13 | 吴嘉懿 | Electricity-stealing prevention electric energy meter |
| CN102072978A (en) * | 2011-01-25 | 2011-05-25 | 武汉盛帆电子股份有限公司 | Single-phase double-circuit manganese copper metering anti-theft electric charge-controlled intelligent electric energy meter |
| CN105486918A (en) * | 2016-01-18 | 2016-04-13 | 广东美的暖通设备有限公司 | Electric quantity management method and system |
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| CF01 | Termination of patent right due to non-payment of annual fee |