CN213240315U - Double-core intelligent electric meter with self-checking function - Google Patents
Double-core intelligent electric meter with self-checking function Download PDFInfo
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- CN213240315U CN213240315U CN202022125236.1U CN202022125236U CN213240315U CN 213240315 U CN213240315 U CN 213240315U CN 202022125236 U CN202022125236 U CN 202022125236U CN 213240315 U CN213240315 U CN 213240315U
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Abstract
The utility model provides a double-core intelligent ammeter with a self-checking function, belonging to the technical field of electric energy meters, comprising at least one metering chip and at least one management chip; the metering chip and the management chip are respectively connected with at least one detection circuit and are connected in series through a bus; the management core and the metering core are separately designed, so that the management core self-checking device has the functions of management core self-checking, metering core self-checking and complete machine self-checking, can realize key parameter on-line self-checking and electric energy metering on-line self-calibration, realizes software and hardware isolation of the metering core and the management core, and solves the problems that the conventional ammeter has no self-diagnosis function and cannot realize on-line self-calibration.
Description
Technical Field
The utility model relates to an electric energy meter technical field, in particular to two core smart electric meters that possess self-checking function.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The multicore modular intelligent electric meter is obviously different from the current standard system of the intelligent electric meter in China by relying on the technical standard of the international legal metering Organization (OIML) for drafting IR 46; the multi-core modular intelligent electric meter adopts the design concept of an international high-end meter, and requires that electronic equipment is separated from a component, and the metering function is independent of other functions. Driven by the national energy management demand, the universal internet of things planning of the ubiquitous power internet of things is increased on the basis of the requirement of strengthening interconnection and intercommunication on a strong intelligent power grid. The intelligent electric energy meter is the strongest foundation stone in a power grid as the most extensive metering basic equipment in the power industry, and the multi-core modular intelligent electric meter is the preferred scheme of the next-generation intelligent electric meter.
The inventor of the utility model finds that the detection and calibration of the existing double-core electric energy meter are mostly carried out by adopting external equipment, the self-detection can not be realized, the separation detection of a metering chip and a management chip in the electric energy meter can not be realized, and the crossing of detection signals can be easily realized; meanwhile, the external detection mode is easily influenced by the external environment and detection equipment, so that the accuracy is low.
SUMMERY OF THE UTILITY MODEL
In order to solve the not enough of prior art, the utility model provides a two core smart electric meters that possess self-checking function adopts the separation design of management core and measurement core, has management core self-checking, measurement core self-checking and complete machine self-checking function, can realize that key parameter is online self-checking, the online self-calibration of electric energy measurement, has realized the software and hardware of measurement core and management core and has kept apart, has solved current ammeter and has not had self-checking function and unable online self-calibration's problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a double-core intelligent ammeter with a self-checking function comprises at least one metering chip and at least one management chip;
the metering chip and the management chip are respectively connected with at least one detection circuit and are connected in series through a bus.
As some possible implementation manners, the detection circuit of the metering chip at least comprises a zero line current detection circuit, the zero line current detection circuit at least comprises a current transformer and a sampling resistor, the sampling resistor at least comprises two resistors connected in series, two ends of the sampling resistor connected in series are connected to two ends of the current transformer, and two ends of the sampling resistor connected in series are also connected with an anti-aliasing filter circuit in parallel.
As some possible implementation manners, the detection circuit of the metering chip at least comprises a live wire current detection circuit, the live wire current detection circuit at least comprises a manganin shunt connected to a live wire, the manganin shunt is connected with an anti-aliasing filter circuit and a calibration circuit, and one port of the manganin shunt is connected to a voltage dependent resistor of the transformer.
As some possible implementation manners, the detection circuit of the metering chip at least comprises a voltage self-detection circuit for measuring the bus voltage, the voltage self-detection circuit at least comprises a serially connected resistor array connected with a zero line, and the other end of the resistor array is connected with a live line after being connected with the anti-aliasing filter circuit.
As possible some implementation manners, the detection circuit of the metering chip at least comprises a cover opening detection circuit and a backup battery detection circuit, the backup battery detection circuit comprises a three-body diode respectively connected with a backup battery, a super capacitor and a system power supply, and the three-body diode is connected with the metering chip after passing through a filter circuit.
As some possible realization modes, the detection circuit of the metering chip at least comprises an event recording circuit which passes through I2And the C bus is connected with the metering chip.
As some possible implementations, the detection circuit of the metering chip at least includes a temperature acquisition circuit and a power supply voltage acquisition circuit, the temperature acquisition circuit includes a plurality of NTC temperature sensors, and the power supply voltage acquisition circuit includes a plurality of voltage dividing resistors.
As some possible implementations, the management chip is connected to the metering chip through an internal connection, which is connected in a connection detection circuit.
As some possible implementation manners, the metering chip at least further includes a management chip offline detection module, and the management chip includes a metering chip offline detection module.
As some possible implementation modes, the uplink module and the downlink module are provided with an online self-checking circuit and a metering core disconnection detection circuit.
Compared with the prior art, the beneficial effects of the utility model are that:
1. electric energy meter, through the separate design who adopts management core and measurement core, have management core self-checking, measurement core self-checking and complete machine self-checking function, can realize key parameter online self-checking, the online self calibration of electric energy measurement, realized the software and hardware isolation of measurement core and management core, solved current ammeter and not had self-diagnostic function, the problem of unable online self-calibration.
2. Electric energy meter, realized voltage self-checking circuit hardware fault detection, current detection circuit hardware fault detection.
3. Electric energy meter, realized that management core and measurement core physics are connected fault detection, management core and outer expansion module physics and are connected fault detection.
4. Electric energy meter, realized the self calibration of measurement chip, can be online self calibration voltage sampling, current sampling and measurement.
5. Electric energy meter, realized measurement core mains operated voltage sampling for realize batch production's uniformity.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is the utility model discloses the two-core smart electric meter block diagram that possesses self-checking function that embodiment 1 provided.
Fig. 2 is the utility model discloses measurement core self-checking circuit diagram that embodiment 1 provided.
Fig. 3 is the utility model discloses measurement core live wire current acquisition and self-checking circuit diagram that embodiment 1 provided.
Fig. 4 is a circuit diagram of measuring core zero line current collection provided by embodiment 1 of the present invention.
Fig. 5 is a circuit diagram of the measurement core voltage acquisition and self-inspection provided in embodiment 1 of the present invention.
Fig. 6 is a circuit diagram for uncovering detection and backup battery voltage acquisition provided by the embodiment of the utility model.
Fig. 7 is a circuit diagram of a metering core event recording circuit provided in embodiment 1 of the present invention.
Fig. 8 is a circuit diagram of temperature and voltage acquisition provided in embodiment 1 of the present invention.
Fig. 9 is a circuit diagram for detecting whether the management core and the measurement core provided by embodiment 1 of the present invention are connected in a good or bad manner.
100-a metering core; 200-a management core; 300-zero line current detection circuit; 400-live current detection circuit; 500-voltage self-test circuit; 600-battery powered domain circuitry; 700-analog quantity acquisition circuit; 800-metering chip.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.
Example 1:
as shown in fig. 1-9, embodiment 1 of the present invention provides a novel dual-core smart electric meter with self-checking function, the block diagram of the electric meter is shown in fig. 1, including: metering core 100, management core 200, power supply and an intermediate connection SPI plug-in.
The metering chip comprises a voltage self-checking circuit, a zero line current self-checking circuit, a live wire circuit self-checking circuit, a metering self-checking circuit, a temperature self-checking circuit, a power supply self-checking circuit, a backup battery self-checking circuit, a management core power failure self-checking circuit and a cover opening self-checking circuit.
The management core comprises an uplink module, a downlink module online self-checking circuit, a backup battery self-checking circuit and a metering core disconnection detection circuit.
The double-core intelligent electric meter can be a single-phase intelligent electric meter or a three-phase electric meter and mainly comprises a metering core and a management core, wherein the metering core is mainly used as a base meter and is mainly responsible for an electric energy metering task, the management core undertakes the management task of the whole meter, the on-line detection and intelligent diagnosis of the electric energy meter are realized through the double-core intelligent electric meter management core, and the active reporting system can be used for self-repairing faults and repairing faults.
The self-checking is divided into a metering core and a management core.
As shown in fig. 2, the self-test circuit diagram of the metering core clearly shows the self-test principle of each circuit component of the metering core.
The zero line current detection circuit 300 is used for measuring zero line current and comprises a current transformer CT1, sampling resistors R8 and R9, an anti-aliasing filter circuit R10, R11, C6, C7 and C8;
the zero line current detection circuit in the embodiment adopts the current transformer for collection of zero line current, so that electricity stealing through modification of a live wire is prevented, and the sampling precision is equal to that of a manganin collection loop.
The live wire current detection circuit 400 is used for measuring live wire current and comprises a manganin shunt MT1, an anti-aliasing filter circuit R2, R3, C1, C2 and C3, and a calibration circuit R4 and C11.
In the embodiment, the current detection mainly comprises that a high-frequency current source is arranged in a metering chip to generate a reference current signal, the reference current signal is connected to a current acquisition circuit and an anti-aliasing filter circuit through a circuit, and whether faults of hardware circuits such as manganese-copper broken lines, anti-aliasing resistance-capacitance broken lines and the like exist is judged through a current channel precision detection unit.
The voltage self-checking circuit 500 is used for measuring the bus voltage and comprises a resistor array Rx, an anti-aliasing filter circuit R6, R7 and C5;
the voltage detection mainly comprises the steps of measuring two built-in high-frequency current sources to generate a reference current signal, coupling the reference current signal to a voltage division array and an anti-aliasing filter circuit through a line, and judging whether faults of hardware circuits such as voltage division circuit disconnection, anti-aliasing resistance capacitance disconnection and the like exist through a voltage channel precision detection unit.
The battery power supply domain circuit 600 is used for realizing backup battery voltage monitoring, cover opening detection, management core physical connection detection and event recording, and the event recording chip is an EEPROM;
each detection circuit is connected to the battery power supply domain of the metering chip, and the battery power supply domain can work independently under the condition that the system power supply is powered down.
The battery power supply domain is connected with a storage chip, when the system is powered down, a cover opening event can be recorded, and after the cover opening event is detected by the cover opening detection circuit, the event record and the EEPROM are notified to the system to check whether the cover is opened normally or not after the system recovers power supply.
As shown in fig. 6, the backup battery voltage switching circuit realizes seamless switching of a backup battery VBAT, a super capacitor VCAP and a system power supply VCC through a three-body diode D1, wherein the VCC is a main power supply, and R14 and C9 are battery voltage acquisition filter circuits, and are connected to a battery power supply domain of a metering chip after filtering.
As shown in fig. 6, the uncovering detection circuit is used for recording an ammeter opening event, a battery power supply domain is divided in the metering chip, a Central Processing Unit (CPU) kernel is not needed, the time for opening the cover can be recorded under the condition of power failure and stored in an Electrically Erasable Programmable Read Only Memory (EEPROM), whether the cover is opened abnormally or not is confirmed through linkage with a background system, and the occurrence of the ammeter opening event is prevented from being tampered by uncovering in a technical means.
The event recording circuit is shown in FIG. 7, wherein the memory chip is EEPROM, via I2The C-bus is connected to the battery powered domain of the metering chip.
The analog quantity acquisition circuit 700 is used for realizing temperature acquisition and power supply voltage acquisition;
the temperature acquisition circuit and the power supply voltage acquisition circuit are shown in figure 8, the temperature acquisition is realized by NTC, and the power supply voltage acquisition is realized by resistance voltage division.
In this embodiment, the temperature detection circuit specifically includes: four NTC thermistors are arranged in the electric energy meter and used for sampling the temperature of an external wiring terminal and detecting the wiring reliability, information is reported to the management core in time when abnormal temperature rise occurs, and the management core determines whether to report the system or not after processing events.
The power supply self-checking circuit described in this embodiment is configured to send a power supply voltage to the metering chip for batch calibration, and the metering chip is provided with a power supply voltage fixed value, and the fixed value is compared with current power supply voltage sampling data to be used as an important parameter for electric energy metering, so as to study and judge current metering acquisition accuracy.
The metering chip 800 internally comprises a current calibration current source Is1, a voltage calibration current source Is2 and Is3, and Is used for realizing the self-calibration function of voltage, current and metering.
In this embodiment, the voltage channel accuracy detection unit and the current channel accuracy detection unit are used to determine the fault of the external circuit, and at the same time, study and determine the current measurement accuracy by comparing the current measurement accuracy with the measurement unit data, calibrate and repair the error data, and send the data result to the management core through the SPI bus for further processing.
The detection circuit of the metering core also comprises a circuit for recording whether the management core and the metering core are in good contact,
the management core is connected with the metering core through the internal connecting piece, whether the connector is inserted in place or not is judged by detecting whether the connector is in place or not as shown in fig. 9, the management core is connected with the expansion module through the internal connecting piece, whether the connector is inserted in place or not is judged by detecting whether the connector is in place or not, and the inserting and pulling-out events of the expansion module are judged and recorded.
Specifically, the connector represents a plug-in terminal in practical application, and when the terminal is completely plugged, the terminal is similar to the connector and is closed, and a module plug-in event is represented; when the terminals are not plugged completely and the connector is disconnected, the event of module extraction is represented
In the management core, the uplink and downlink communication module disconnection self-detection circuit comprises an external expansion module disconnection detection circuit used for recording the plugging event of the external expansion module.
The embodiment realizes a novel double-core intelligent ammeter with a self-checking function, the ammeter is divided into a metering core and a management core from the aspects of hardware and software, the online detection and intelligent diagnosis of the ammeter are realized, the online calibration function of the ammeter is realized, and the reliability of a system can be improved; by adopting a novel specially-made metering product, the metering chip internally comprises a current channel precision detection unit, a voltage channel precision detection unit, a metering unit and a judging unit, and the self-calibration is carried out after the sampling fundamental wave data is compared and analyzed for errors.
Example 2:
the embodiment 2 of the utility model provides a novel two-core smart electric meter that possesses self-checking function, management core backup storage measurement parameter, before the system judges the measurement trouble, check whether measurement core measurement parameter is normal, carry out the selfreparing at first after discovering unusually, if the measurement function resumes normal after repairing, record the incident, if can't self-repare, judge the measurement trouble;
the management core management software also realizes the abnormal diagnosis of the electric quantity through a flying algorithm, an electric energy meter indication value unevenness algorithm and an electric energy meter backward walking algorithm, backups the metering parameters of the metering core through the software, studies and judges the read metering data of the metering core, determines whether the phenomenon that the metering parameters are abnormally modified exists or not, and records and reports abnormal events.
The other structures of the electric meter are the same as those in embodiment 1, and are not described again here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A double-core intelligent ammeter with a self-checking function is characterized by comprising at least one metering chip and at least one management chip;
the metering chip and the management chip are respectively connected with at least one detection circuit and are connected in series through a bus.
2. The dual-core smart meter with the self-test function according to claim 1, wherein the detection circuit of the metering chip at least comprises a zero line current detection circuit, and the zero line current detection circuit at least comprises a current transformer and a sampling resistor;
the sampling resistor at least comprises two resistors which are connected in series, two ends of the sampling resistor which is connected in series are connected to two ends of the current transformer, and two ends of the sampling resistor which is connected in series are also connected with the anti-aliasing filter circuit in parallel.
3. The dual-core smart meter with the self-checking function according to claim 1, wherein the detection circuit of the metering chip at least comprises a live wire current detection circuit, and the live wire current detection circuit at least comprises a manganin shunt connected to a live wire;
the manganin shunt is connected with an anti-aliasing filter circuit and a calibration circuit, and one port of the manganin shunt is connected to the voltage dependent resistor of the transformer.
4. The double-core smart meter with the self-checking function according to claim 1, wherein the detection circuit of the metering chip at least comprises a voltage self-checking circuit for bus voltage measurement;
the voltage self-checking circuit at least comprises a resistor array connected with a zero line in series, and the other end of the resistor array is connected with the live wire after being connected with the anti-aliasing filter circuit.
5. The dual-core smart meter with the self-checking function according to claim 1, wherein the detection circuit of the metering chip at least comprises an uncovering detection circuit and a backup battery detection circuit;
the backup battery detection circuit comprises a three-body diode connected with the backup battery, the super capacitor and the system power supply respectively, and the three-body diode is connected with the metering chip after passing through the filter circuit.
6. The dual-core smart meter with self-checking function according to claim 1, wherein the detection circuit of the metering chip at least comprises an event recording circuit, and the event recording circuit passes through I2And the C bus is connected with the metering chip.
7. The dual-core smart meter with the self-checking function according to claim 1, wherein the detection circuit of the metering chip at least comprises a temperature acquisition circuit and a power supply voltage acquisition circuit, the temperature acquisition circuit comprises a plurality of NTC temperature sensors, and the power supply voltage acquisition circuit comprises a plurality of voltage dividing resistors.
8. The dual-core smart meter with the self-checking function according to claim 1, wherein the management chip is connected with the metering chip through an internal connecting piece, and the internal connecting piece is connected in the connecting piece detection circuit.
9. The dual-core smart meter with the self-checking function according to claim 1, wherein the metering chip at least further comprises a management chip offline detection module, and the management chip comprises a metering chip offline detection module.
10. The dual-core smart meter with the self-checking function according to claim 1, wherein the up-link module and the down-link module are an on-line self-checking circuit and a metering core disconnection detection circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022125236.1U CN213240315U (en) | 2020-09-24 | 2020-09-24 | Double-core intelligent electric meter with self-checking function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022125236.1U CN213240315U (en) | 2020-09-24 | 2020-09-24 | Double-core intelligent electric meter with self-checking function |
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| CN213240315U true CN213240315U (en) | 2021-05-18 |
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| CN202022125236.1U Active CN213240315U (en) | 2020-09-24 | 2020-09-24 | Double-core intelligent electric meter with self-checking function |
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Address after: Room 902, 9 / F, block B, Yinhe building, 2008 Xinluo street, hi tech Zone, Jinan City, Shandong Province Patentee after: Shandong luruan Digital Technology Co.,Ltd. smart energy branch Address before: Room 902, 9 / F, block B, Yinhe building, 2008 Xinluo street, hi tech Zone, Jinan City, Shandong Province Patentee before: Shandong Luneng Software Technology Co.,Ltd. intelligent electrical branch |