CN114184877B - Electric energy meter and full-voltage-loss detection method thereof - Google Patents
Electric energy meter and full-voltage-loss detection method thereof Download PDFInfo
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- CN114184877B CN114184877B CN202010963664.3A CN202010963664A CN114184877B CN 114184877 B CN114184877 B CN 114184877B CN 202010963664 A CN202010963664 A CN 202010963664A CN 114184877 B CN114184877 B CN 114184877B
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- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 238000004891 communication Methods 0.000 claims abstract description 128
- 238000002955 isolation Methods 0.000 claims abstract description 113
- 238000005070 sampling Methods 0.000 claims abstract description 65
- 238000006243 chemical reaction Methods 0.000 claims description 45
- 238000004146 energy storage Methods 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 27
- 238000010586 diagram Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- 229910052744 lithium Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses an electric energy meter and a full-voltage-loss detection method thereof, wherein the electric energy meter comprises: the sampling circuit obtains the sampling voltage of the power line; the metering circuit collects line voltage and current of a user terminal; the isolation communication circuit isolates the voltage and current of the user terminal line; in a low-power consumption operation mode of the electric energy meter when the power line is powered down, when the power-down duration exceeds a preset time, the data processing circuit sends a closing signal, and carries out full-voltage loss detection, and after the full-voltage loss detection is completed, the data processing circuit sends an opening signal; the power supply circuit supplies power to the metering circuit, the isolation communication circuit and the data processing circuit according to the closing signal; and stopping power supply according to the disconnection signal. The data processing circuit judges whether the power line is powered down according to the voltage of the power line, and when the power line is powered down, the power supply circuit is controlled to supply power to the metering circuit, the isolation communication circuit, the data processing circuit and the sampling circuit, so that the electric energy meter is ensured to be powered down continuously in the power line power-down state.
Description
Technical Field
The invention relates to the technical field of electronic electric energy meters, in particular to an electric energy meter and a full-voltage-loss detection method thereof.
Background
The full voltage loss is the working condition that the three-phase voltage is lower than the critical voltage of the electric energy meter, and the load current is greater than 5% of rated (basic) current, and the full voltage loss event record and the calculation of the safety value during the full voltage loss in the power grid are used for reasonably supplementing the electric quantity. The critical voltage (threshold) is the lowest voltage at which the electric energy meter can start operation. When each phase is lower than the critical voltage of the electric energy meter, the electronic electric energy meter loses the power supply of the power grid, and the standby battery supplies power. At this time, the electric energy meter is to periodically (< 60S) detect the three-phase load current, and compare with the threshold current (5% rated (basic) current) to judge whether the electric energy meter is in the state of full voltage loss, if in the state of full voltage loss, still record the current effective value at this moment, this is the event recording function of full voltage loss. When the electric energy meter is in full voltage loss, the electric energy meter is mainly powered by using an internal full voltage loss battery, the full voltage loss battery adopts a non-chargeable columnar lithium battery, and meanwhile, the service life requirement is not less than three years.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect of low safety of the electric energy meter powered by the full-voltage-loss battery in the prior art, thereby providing the electric energy meter and the full-voltage-loss detection method thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides an electric energy meter, where the electric energy meter is connected between a power line and a subscriber line, and the electric energy meter includes: the device comprises a sampling circuit, a data processing circuit, a metering circuit, a power circuit and an isolation communication circuit, wherein the sampling circuit is respectively connected with the power circuit, a power circuit and the data processing circuit and is used for collecting the voltage of the power circuit and converting the amplitude of the voltage to obtain a sampling voltage; the metering circuit is respectively connected with the user terminal line, the power supply circuit, the isolation communication circuit and the data processing circuit and is used for collecting the voltage and the current of the user terminal line; the isolation communication circuit is respectively connected with the power supply circuit, the metering circuit and the data processing circuit and is used for isolating the voltage and the current of the user side line collected by the metering circuit and then transmitting the isolated voltage and the isolated current to the data processing circuit; the data processing circuit is respectively connected with the sampling circuit, the metering circuit, the power supply circuit and the isolation communication circuit and is used for comparing the sampling voltage with a preset threshold value, judging whether the power line is powered down or not and whether the power line power down duration exceeds a preset time, entering a low-power consumption operation mode when the power line is judged to be powered down, and sending a closing signal to the power supply circuit and the isolation communication circuit when the power line power down duration exceeds the preset time; detecting total voltage loss according to the voltage and current of the user terminal line, and judging the running state of the user terminal line; after the full-voltage-loss detection is completed, sending a disconnection signal to the power supply circuit and the isolation communication circuit; the power supply circuit is respectively connected with the power circuit, the sampling circuit, the metering circuit, the isolation communication circuit and the data processing circuit and is used for supplying power to the metering circuit, the isolation communication circuit and the data processing circuit according to the closing signal; and according to the disconnection signal, disconnecting the metering circuit and the isolation communication circuit.
In one embodiment, the electric energy meter further comprises: the power conversion circuit is respectively connected with the power line, the sampling circuit, the metering circuit, the isolation communication circuit and the data processing circuit and is used for supplying power to the metering circuit, the isolation communication circuit and the data processing circuit after the voltage of the power line is subjected to voltage conversion.
In one embodiment, a power supply circuit includes: the first power supply circuit is respectively connected with the power line, the sampling circuit, the power conversion circuit, the isolation communication circuit, the metering circuit and the data processing circuit and is used for supplying power to the sampling circuit, the metering circuit and the isolation communication circuit according to a first closing signal when the power-down duration of the power line exceeds a preset time; after the full-voltage-loss detection is completed, stopping supplying power to the sampling circuit, the metering circuit and the isolation communication circuit according to the first disconnection signal; the second power circuit is respectively connected with the data processing module, the power conversion circuit and the isolation communication circuit and is used for supplying power to the data processing module and the isolation communication circuit according to a second closing signal when the power-down duration time of the power circuit exceeds the preset time; and after the full-voltage-loss detection is completed, disconnecting the communication circuit from the isolation communication circuit according to the second disconnection signal.
In one embodiment, an isolated communication circuit includes: the high-speed isolation communication circuit is respectively connected with the first power supply circuit, the metering circuit, the data processing circuit and the power supply conversion circuit and is used for isolating the voltage and the current of the user side line collected by the metering circuit and then transmitting the isolated voltage and the isolated current to the data processing circuit; the control circuit is respectively connected with the second power supply circuit, the power supply conversion circuit and the high-speed isolation communication circuit and is used for connecting the second power supply circuit with the high-speed isolation communication circuit according to a second closing signal so as to enable the second power supply circuit to supply power for the high-speed isolation communication circuit; and according to the second disconnection signal, disconnecting the second power supply circuit from the high-speed isolation communication circuit.
In one embodiment, a first power supply circuit includes: the isolation control circuit is respectively connected with the first energy storage circuit, the data processing circuit and the power supply conversion circuit and is used for connecting the first energy storage circuit with the metering circuit according to a first closing signal so that the first energy storage circuit supplies power for the sampling circuit, the metering circuit and the high-speed isolation communication circuit; according to the first disconnection signal, stopping the first energy storage circuit from supplying power to the sampling circuit, the metering circuit and the high-speed isolation communication circuit; the first energy storage circuit is respectively connected with the sampling circuit, the power conversion circuit and the isolation control circuit and is used for storing energy when the power line is normal; when the power line is powered down, the power line is connected with the metering circuit, and the stored energy is subjected to voltage conversion to supply power for the metering circuit and the high-speed isolation communication circuit.
In one embodiment, the second power supply circuit includes: the second energy storage circuit is connected with the voltage conversion circuit and is used for supplying power for the data processing circuit and the isolation communication circuit; the voltage conversion circuit is respectively connected with the second energy storage circuit, the data processing circuit and the control circuit and is used for supplying power to the data processing circuit and the isolation communication circuit after converting the voltage of the second energy storage circuit according to the second closing signal; and according to the disconnection signal, disconnecting the connection with the second energy storage circuit, and stopping the second energy storage circuit from supplying power to the isolated communication circuit.
In an embodiment, the data processing circuit is further configured to configure the metering circuit to calibrate parameters.
In a second aspect, an embodiment of the present invention provides a method for detecting total voltage loss of an electric energy meter, based on the electric energy meter in the first aspect, where the method includes: the sampling circuit collects the voltage of the power line in real time; the data processing circuit judges whether the power line is powered down according to the voltage of the power line and a preset threshold value, and controls the electric energy meter to enter a low-power consumption operation mode after judging that the power line is powered down; the data processing circuit controls the power supply state of the power supply circuit according to a first preset control method, and the metering circuit meters the voltage and the current of the user terminal circuit; the data processing circuit carries out full-decompression processing according to the voltage and the current of the user side line, judges the running state of the user side line and generates a judging result of the running state of the user side line; the data processing circuit controls the power supply state of the power supply circuit according to a second preset control method; the data processing circuit controls the electric energy meter to enter a low-power consumption operation mode.
In one embodiment, the data processing circuit controls a power supply state of the power supply circuit according to a first preset control method, and the metering circuit meters a voltage and a current of the subscriber line, including: the data processing circuit judges whether the power failure duration of the power line reaches a first preset time according to the voltage of the power line; when the power-down duration of the power line reaches a first preset time, the data processing circuit sequentially sends a first closing signal to the first power circuit and a second closing signal to the second power circuit; the data processing circuit configures meter calibrating parameters of the metering circuit, and the metering circuit performs meter calibrating according to the meter calibrating parameters; the data processing circuit judges whether the power failure duration of the power line reaches a second preset time according to the voltage of the power line; when the power line power-down duration reaches a second preset time, the metering circuit meters the voltage and the current of the user terminal line.
In one embodiment, the process of controlling the power supply state of the power supply circuit by the data processing circuit according to the second preset control method includes: the data processing circuit sequentially sends a first disconnection signal to the first power supply circuit and a second disconnection signal to the second power supply circuit.
The technical scheme of the invention has the following advantages:
1. according to the electric energy meter and the full voltage loss detection method thereof, the data processing circuit judges whether the power line is powered down according to the voltage and the current of the power line, and when the power line is powered down, the data processing circuit controls the power supply circuit to supply power to the metering circuit, the isolation communication circuit, the data processing circuit and the sampling circuit, so that the electric energy meter is ensured to be powered down continuously in the power line power-down state.
2. According to the electric energy meter and the full-voltage-loss detection method thereof, when the power circuit is powered down, the first energy storage circuit and the second energy storage circuit supply power for the electric energy meter, so that the power supply reliability of the electric energy meter is improved, and the power consumption is reduced; the isolation communication circuit isolates the data information between the metering circuit and the data processing circuit, so that the isolation between the full-voltage-loss battery and an external power line is ensured, and the safety of replacing the full-voltage-loss battery is improved. .
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a composition diagram of a specific example of an electric energy meter according to an embodiment of the present invention;
fig. 2 is a specific circuit diagram of a sampling circuit and a power conversion circuit according to an embodiment of the present invention;
fig. 3 is a composition diagram of another specific example of an electric energy meter according to an embodiment of the present invention;
fig. 4 is a composition diagram of another specific example of an electric energy meter according to an embodiment of the present invention;
fig. 5 is a specific circuit diagram of a first power supply circuit according to an embodiment of the present invention;
fig. 6 is a specific circuit diagram of a second power supply circuit according to an embodiment of the present invention;
FIG. 7 is a specific circuit diagram of an isolated communication circuit according to an embodiment of the present invention;
fig. 8 is a flowchart of a specific example of a full-voltage-loss detection method of an electric energy meter according to an embodiment of the present invention;
fig. 9 is a flowchart of another specific example of a full-voltage-loss detection method of an electric energy meter according to an embodiment of the present invention;
fig. 10 is a flowchart of another specific example of a full-voltage-loss detection method of an electric energy meter according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
The embodiment of the invention provides an electric energy meter, which is applied to occasions requiring uninterrupted power supply when the electric energy meter performs full voltage loss detection, and is connected between a power line and a user terminal line, as shown in fig. 1, the electric energy meter comprises: a sampling circuit 1, a data processing circuit 2, a metering circuit 3, a power supply circuit 4 and an isolated communication circuit 5.
As shown in fig. 1, a sampling circuit 1 in the embodiment of the present invention is respectively connected to a power circuit 4, a power line, and a data processing circuit 2, and is configured to collect a voltage of the power line, and perform amplitude conversion on the voltage to obtain a sampled voltage.
As shown in fig. 1, the electric energy meter according to the embodiment of the present invention is installed between a power line and a subscriber line, and the sampling circuit 1 collects the voltage of the power line in real time, performs voltage limiting and amplitude conversion on the voltage to obtain a sampled voltage, and sends the sampled voltage to the data processing circuit 2. As shown in fig. 2, the sampling circuit 1 is connected to the POWER circuit 4 by resistors R154, R153, R152, R151, R150, R149, R148, R147, R146, R145, R144, R3, R2, R130, R137, capacitors C7, C5, switching transistors V2, V13, and an optocoupler isolation chip U5, v_meter, and the power_det is connected to the data processing circuit 2. The sampling circuit 1 is used for limiting the voltage and the current at the DC+ through collecting the voltage at the DC+ by a circuit formed by resistors R154, R153, R152, R151, R150, R149, R148, R147, R146 and R145, the voltage after the voltage limiting is isolated by an optocoupler isolation chip U5, the sampling voltage is obtained and is transmitted to the data processing circuit 2 through the POWER_DET, and the data processing circuit 2 is used for judging whether the POWER line is powered down. When the POWER line is not powered down, V2 is closed, V13 is opened, U5 outputs power_det to be high level, and when the POWER line is powered down, V2 is opened, V13 is closed, U5 outputs power_det to be low level.
As shown in fig. 1, a metering circuit 3 in the embodiment of the present invention is respectively connected to a subscriber line, a power supply circuit 4, an isolation communication circuit 5 and a data processing circuit 2, and is used for collecting the voltage and current of the subscriber line. The isolation communication circuit 5 is respectively connected with the power supply circuit 4, the metering circuit 3 and the data processing circuit 2, and is used for isolating the voltage and the current of the user side line collected by the metering circuit 3 and then transmitting the isolated voltage and the isolated current to the data processing circuit 2.
In the embodiment of the invention, the metering circuit 3 may include a metering chip and a peripheral circuit thereof, the metering circuit 3 collects the voltage and current of the user side line, processes the voltage and current of the user side line according to the actual working condition requirement to obtain electrical parameters such as power, electric energy and the like, and sends the voltage, current or electrical parameters of the user side line to the data processing circuit 2 through the isolation communication circuit 5.
As shown in fig. 1, a data processing circuit 2 of the embodiment of the present invention is respectively connected to a sampling circuit 1, a metering circuit 3, a power supply circuit 4, and an isolation communication circuit 5, and is configured to compare a sampling voltage with a preset threshold value, determine whether a power line is powered down and whether a power line power-down duration exceeds a preset time, enter a low-power consumption operation mode when determining that the power line is powered down, and send a closing signal to the power supply circuit 4 and the isolation communication circuit 5 when the power line power-down duration exceeds the preset time; detecting total voltage loss according to the voltage and current of the user terminal line, and judging the running state of the user terminal line; when the full-voltage-loss detection is completed, an off signal is sent to the power supply circuit 4 and the isolation communication circuit 5.
As shown in fig. 1, a power supply circuit 4 of the embodiment of the present invention is respectively connected to a power line, a sampling circuit 1, a metering circuit 3, an isolated communication circuit 5 and a data processing circuit 2, and is used for supplying power to the metering circuit 3, the isolated communication circuit 5 and the data processing circuit 2 according to a closing signal; according to the disconnection signal, the connection with the metering circuit 3 and the isolation communication circuit 5 is disconnected.
The data processing circuit 2 in the embodiment of the invention not only can process the voltage, the current or the electrical parameters of the user side line sent by the metering circuit 3 when the power line is not powered down, but also can judge whether the power line is powered down, and after the power line is judged to be powered down, the electric energy meter enters a full-voltage-loss state, the data processing circuit 2 controls each circuit in the electric energy meter to enter a low-power-consumption operation mode, when the power line power-down duration exceeds a preset time, the power supply circuit 4 is controlled to supply power to the sampling circuit 1, the metering circuit 3, the isolation communication circuit 5 and the data processing circuit 2 by controlling the on-off state of the power supply circuit 4, and the user side line is subjected to full-voltage-loss detection, and after the full-voltage-loss detection is finished, the power supply circuit 4 is controlled to stop supplying power to the sampling circuit 1, the metering circuit 3 and the isolation communication circuit 5.
According to the electric energy meter provided by the embodiment of the invention, the data processing circuit judges whether the power line is powered down according to the voltage of the power line, and when the power line is powered down, the data processing circuit controls the power supply circuit to supply power for the metering circuit, the isolation communication circuit, the data processing circuit and the sampling circuit, so that the electric energy meter is ensured not to be powered down in a full voltage-losing state.
In one embodiment, as shown in fig. 3, the electric energy meter further includes: the power conversion circuit 6 is connected to the power line, the sampling circuit 1, the metering circuit 3, the isolation communication circuit 5 and the data processing circuit 2, and is configured to convert the voltage of the power line into a voltage and then supply power to the metering circuit 3, the isolation communication circuit 5 and the data processing circuit 2.
In the embodiment of the invention, the power conversion circuit 6 is powered from the power line under the normal condition of the power line, and is powered by the power circuit (the second power circuit) under the power failure condition of the power line, and the power conversion circuit 6 converts the voltage output by the power circuit into the corresponding power supply voltage for the metering circuit 3, the isolation communication circuit 5 and the data processing circuit 2. Specifically, as shown in fig. 2, the bridge circuit formed by the diodes D11, D13, D19, D9, D15, D17, D24, D12, D14, D20, D22, D23, D10, D16, D18, and D25 rectifies the voltage of the power line to obtain a dc voltage, and the chip U8 converts the dc voltage into a power supply voltage required by the metering circuit 3, the isolation communication circuit 5, and the data processing circuit 2, and it should be noted that the bridge circuit in fig. 2 may be another rectifying circuit.
In one embodiment, as shown in fig. 4, the power circuit 4 includes: a first power supply circuit 41 and a second power supply circuit 42.
As shown in fig. 4, a first power circuit 41 of the embodiment of the present invention is respectively connected to a power line, a sampling circuit 1, a power conversion circuit 6, an isolated communication circuit 5, a metering circuit 3 and a data processing circuit 2, and is configured to supply power to the sampling circuit 1, the metering circuit 3 and the isolated communication circuit 5 according to a first closing signal when a power-down duration of the power line exceeds a preset time; when the full-voltage-loss detection is completed, the power supply to the sampling circuit 1, the metering circuit 3 and the isolation communication circuit 5 is stopped according to the first disconnection signal.
As shown in fig. 4, a second power circuit 42 of the embodiment of the present invention is respectively connected to the data processing module, the power conversion circuit 6 and the isolated communication circuit 5, and is configured to supply power to the data processing module and the isolated communication circuit 5 according to the second closing signal when the power-down duration of the power line exceeds a preset time; when the full-voltage-loss detection is completed, the connection with the isolated communication circuit 5 is disconnected according to the second disconnection signal.
In the embodiment of the present invention, when the power line is powered down, and after the power line is continuously powered down for a preset time, the data processing circuit 2 sequentially sends a first closing signal to the first power circuit 41 and a second closing signal to the second power circuit 42, the first power circuit 41 supplies power to the sampling circuit, the isolated communication circuit 5 and the metering circuit 3, the second power circuit 42 supplies power to the isolated communication circuit 5 and the data processing circuit 2, the data processing circuit 2 performs full voltage loss detection, and after the detection is completed, the data processing circuit 2 sequentially sends a first opening signal to the first power circuit 41 and a second opening signal to the second power circuit 42, the first power circuit 41 stops supplying power to the sampling circuit, the isolated communication circuit 5 and the metering circuit 3, and the second power circuit 42 stops supplying power to the isolated communication circuit 5.
In one embodiment, as shown in fig. 5, the first power supply circuit 41 includes: the isolation control circuit 411 and the first tank circuit 412.
As shown in fig. 5, the isolation control circuit 411 of the embodiment of the present invention is respectively connected to the first energy storage circuit 412, the data processing circuit 2 and the power conversion circuit 6, and is configured to connect the first energy storage circuit 412 to the metering circuit 3 according to the first closing signal, so that the first energy storage circuit 412 supplies power to the sampling circuit 1, the metering circuit 3 and the high-speed isolation communication circuit; the first tank circuit 412 is stopped from powering the sampling circuit 1, the metering circuit 3, and the high-speed isolation communication circuit in response to the first off signal. The first energy storage circuit 412 is connected to the sampling circuit 1, the power conversion circuit 6 and the isolation circuit, respectively, and is used for storing energy when the power line is normal; when the power line is powered down, the power line is connected with the metering circuit 3, and the stored energy is subjected to voltage conversion to supply power for the sampling circuit 1, the metering circuit 3 and the high-speed isolation communication circuit.
As shown in fig. 5, the first tank circuit 412 is connected to the power conversion circuit 6 through a v_4.8v port, connected to the power line through a v_sys port, outputs a supply voltage at pin 5 of U2, and supplies power to the sampling circuit 1, the metering circuit 3, and the high-speed isolation communication circuit through a v_meter port; the isolation control circuit 411 is connected to the data processing circuit 2 through the MEER_PWR_CTL port and to the power conversion circuit 6 through the V_MCU_Meter.
In the first power supply circuit 41 shown in fig. 5, when the power line is not powered down, V14 is in an on state, pin 3 of U2 is in a low level, enable end EN of U2 is turned off, and U2 prohibits outputting the supply voltage, so as to prevent the energy storage device C1 from discharging in the case of power line having electricity; when the power line is powered down and V14 is in a closed state, the 3 rd pin of U2 is at a high level, the enable end EN of U2 is opened, the 5 th pin OUT of U2 has a supply voltage output (the supply voltage is the voltage obtained by converting the discharge voltage of the energy storage device C1 by U2), meanwhile, when the isolation control circuit 411 receives the first closing signal sent by the data processing circuit 2 through the met_pwr_ctl port, the isolation chip U4 is opened, the V14 is turned off, the V3 is opened, the super capacitor C1 discharges at this time, after the discharge voltage of C1 is converted by U2, the power voltage is connected with the isolation communication circuit 5, the metering circuit 3 and the sampling circuit 1 through the v_met port connected with the V3, and at this time, the C1 supplies power to the isolation communication circuit 5, the metering circuit 3 and the sampling circuit 1.
As shown in fig. 6, the second power supply circuit 42 includes: the second tank circuit 421 and the voltage conversion circuit 422.
As shown in fig. 6, the second tank circuit 421 of the embodiment of the present invention is connected to the voltage conversion circuit 422 for supplying power to the data processing circuit 2 and the isolated communication circuit 5. The voltage conversion circuit 422 is respectively connected with the second energy storage circuit 421, the data processing circuit 2 and the control circuit, and is configured to supply power to the data processing circuit 2 and the isolation communication circuit 5 after converting the voltage of the second energy storage circuit 421 according to the second closing signal; according to the disconnection signal, the connection with the second tank circuit 421 is disconnected, and the second tank circuit 421 is stopped to supply power to the isolated communication circuit 5.
As shown in fig. 6, the second power supply circuit 42 is connected to the power supply conversion circuit 6 through a v_mcu_4.0V port, to the data processing circuit 2 through a mcu_vd port and a bat_6v_en port, and to the control circuits of the data processing circuit 2 and the isolation communication circuit 5 through a bat_3.6V port. After the power line is powered down, the power conversion circuit 6 receives the second closing signal sent by the data processing circuit 2 through the bat_6v_en port, and the chip U30 converts the voltage of the second energy storage circuit 421 to supply power to the data processing circuit 2 and the isolation communication circuit 5. In an embodiment, the second tank circuit 421 may be a full-voltage-loss battery, but this is merely an example and is not a limitation.
In one embodiment, as shown in fig. 7, the isolated communication circuit 5 includes: high-speed isolation communication circuit 51 and control circuit 52.
As shown in fig. 7, the high-speed isolation communication circuit 51 of the embodiment of the present invention is respectively connected to the first power supply circuit 41, the metering circuit 3, the data processing circuit 2 and the power conversion circuit 6, and is configured to isolate the voltage and the current of the subscriber line collected by the metering circuit 3 and then transmit the isolated voltage and current to the data processing circuit 2. The control circuit 52 is respectively connected to the second power supply circuit 42, the power conversion circuit 6 and the high-speed isolation communication circuit 51, and is configured to connect the second power supply circuit 42 to the high-speed isolation communication circuit 51 according to the second closing signal, so that the second power supply circuit 42 supplies power to the high-speed isolation communication circuit 51; according to the second disconnection signal, the second power supply circuit 42 is disconnected from the high-speed isolation communication circuit 51.
As shown in fig. 7, the high-speed isolation communication circuit 51 is connected to the metering circuit 3 via a MeterDin port, to the data processing circuit 2 via a McuDin port, to the first power supply circuit 41 via a v_meter port, and to the power supply conversion circuit 6 via a v_mcu_meter port; the control circuit 52 is connected to the data processing circuit 2 through the METER_PWR_CTL port, to the power conversion circuit 6 through the VMCU_Meter_4.0V port and the V_MCU_Meter port, and to the second power supply circuit 42 through the BAT_3.6V port.
In the isolated communication circuit 5 shown in fig. 7, when the power line power-down duration exceeds the preset time, the data processing circuit 2 sequentially sends a first closing signal to the first power circuit 41, a second closing signal to the second power circuit 42 and the control circuit 52 of the isolated communication circuit 5, at this time, V17, V16 and V1 are all turned on, the first power circuit 41 and the second power circuit 42 simultaneously supply power to the high-speed isolated communication circuit 51, the metering circuit 3 sends the collected voltage, current or metering result of the user line to the high-speed isolated communication circuit 51 through the v_meter port, and the data processing circuit 2 receives the voltage, current or metering result of the user line sent by the metering circuit 3 through the McuDin port.
In the embodiment of the present invention, after the data processing circuit 2 completes the full-voltage loss detection, the first power supply circuit 41 receives the first disconnection signal through its internal METER_PWR_CTL port, the isolated communication circuit 5 receives the second disconnection signal through its internal METER_PWR_CTL port, and the second power supply circuit 42 receives the second disconnection signal through its internal BAT_6V_EN port.
In a specific embodiment, the data processing circuit 2 is further configured to calibrate parameters of the metering circuit 3, and the data processing circuit 2 includes an MCU and its peripheral circuits.
According to the electric energy meter provided by the embodiment of the invention, the data processing circuit judges whether the power line is powered down according to the voltage and the current of the power line, and when the power line is powered down, the data processing circuit controls the power supply circuit to supply power to the metering circuit, the isolation communication circuit, the data processing circuit and the sampling circuit, so that the electric energy meter is ensured to be powered down continuously in the power line power-down state; when the power line is powered off, the first energy storage circuit and the second energy storage circuit supply power for the electric energy meter, so that the power supply reliability of the electric energy meter is improved, and the power consumption is reduced; the isolation communication circuit isolates the data information between the metering circuit and the data processing circuit, so that the isolation between the full-voltage-loss battery and an external power line is ensured, and the safety of replacing the full-voltage-loss battery is improved. .
Example 2
The embodiment of the invention provides a full-voltage-loss detection method of an electric energy meter, which is based on the electric energy meter of embodiment 1, as shown in fig. 8, and comprises the following steps:
step S11: the sampling circuit collects the voltage of the power line in real time.
Step S12: and the data processing circuit judges whether the power line is powered down according to the voltage of the power line and a preset threshold value, and controls the electric energy meter to enter a low-power consumption operation mode after judging that the power line is powered down.
Step S13: the data processing circuit controls the power supply state of the power supply circuit according to a first preset control method, and the metering circuit meters the voltage and the current of the user terminal line.
Step S14: the data processing circuit carries out full-decompression processing according to the voltage and the current of the user side line, judges the running state of the user side line and generates a judging result of the running state of the user side line.
Step S15: the data processing circuit controls the power supply state of the power supply circuit according to a second preset control method.
Step S16: the data processing circuit controls the electric energy meter to enter a low-power consumption operation mode.
In the embodiment of the invention, a sampling circuit acquires the voltage of a power line in real time, a data processing circuit judges whether the power line is powered down according to the voltage of the power line, at the initial moment of power failure of the power line, an electric energy meter enters a low-power-consumption operation mode, the data processing circuit controls a power supply circuit to supply power to a metering circuit, the sampling circuit, an isolation communication circuit and the data processing circuit according to a first preset control method, the metering circuit acquires the voltage and the current of a user side line, the data processing circuit performs full-voltage-loss detection according to the voltage and the current of the user side line (or the metering result obtained after the metering circuit meters the voltage and the current of the user side line), the data processing circuit judges the operation state of the user side line, and after the full-voltage-loss detection, the data processing circuit controls the power supply state of the power supply circuit according to a second preset control method, and the electric energy meter enters the low-power-consumption operation mode.
In one embodiment, as shown in fig. 9, the data processing circuit controls the power supply state of the power supply circuit according to a first preset control method, and the process of measuring the voltage and the current of the line at the user terminal by the metering circuit includes:
step S21: the data processing circuit judges whether the power failure duration of the power line reaches a first preset time according to the voltage of the power line.
Step S22: when the power line power-down duration reaches a first preset time, the data processing circuit sequentially sends a first closing signal to the first power circuit and a second closing signal to the second power circuit.
Step S23: the data processing circuit configures meter calibrating parameters of the metering circuit, and the metering circuit performs meter calibrating according to the meter calibrating parameters.
Step S24: the data processing circuit judges whether the power failure duration of the power line reaches a second preset time according to the voltage of the power line.
Step S25: when the power line power-down duration reaches a second preset time, the metering circuit meters the voltage and the current of the user terminal line.
In the embodiment of the invention, after the power-down duration of the power line reaches a first preset time, the data processing circuit sequentially sends a first closing signal to the first power circuit and a second closing signal to the second power circuit, at this time, the power circuit supplies power to the metering circuit, the data processing circuit, the isolation communication circuit and the data processing circuit, the data processing circuit configures metering circuit meter calibration parameters, the metering circuit performs meter calibration according to the meter calibration parameters, the data processing circuit judges whether the power-down duration of the power line reaches a second preset time according to the voltage of the power line, and when the power-down duration of the power line reaches the second preset time, the metering circuit acquires the voltage and the current of the user side line, and the data processing circuit acquires the metering result obtained after the metering circuit meters the voltage and the current of the user side line according to the voltage and the current of the user side line.
In a specific embodiment, the process of controlling the power supply state of the power supply circuit by the data processing circuit according to the second preset control method includes: the data processing circuit sequentially sends a first disconnection signal to the first power supply circuit and a second disconnection signal to the second power supply circuit.
The implementation process of the full-voltage-loss detection method of the electric energy meter provided by the embodiment of the invention is shown in fig. 10, and the time parameters in the diagram are set according to actual conditions. As shown in fig. 10, after the data processing circuit detects that the power line is powered down, the electric energy meter enters a low-power consumption operation mode, when the power line power down time reaches 58 seconds, the data processing circuit sequentially turns on a super capacitor (an energy storage element C1) to supply power to a metering chip (a first power supply circuit and an isolated communication circuit are sent, the first power supply circuit supplies power to the metering circuit, the isolated communication circuit and a sampling circuit), a full-voltage-loss battery (a second power supply circuit is sent to the second power supply circuit, the second power supply circuit supplies power to the isolated communication circuit), the data processing circuit configures metering chip meter parameters (the metering circuit comprises the metering chip and a peripheral circuit thereof), when the power line power down time reaches 60 seconds, the metering circuit collects voltage and current of a user side line, and the data processing circuit sequentially turns off the super capacitor (a first power supply circuit is sent to the first power supply circuit) and the full-voltage-loss battery (a second power supply circuit is sent to the isolated communication circuit and the second power supply circuit is disconnected after the detection is completed according to the voltage and current of the metering circuit obtained by the user side line.
According to the full-voltage-loss detection method for the electric energy meter, the data processing circuit judges whether the electric power circuit is powered down according to the voltage and the current of the electric power circuit, and when the electric power circuit is powered down, the data processing circuit controls the power circuit to supply power to the metering circuit, the isolation communication circuit, the data processing circuit and the sampling circuit, so that the electric energy meter is ensured to be powered down continuously in the power circuit power-down state; when the power line is powered off, the first energy storage circuit and the second energy storage circuit supply power for the electric energy meter, so that the power supply reliability of the electric energy meter is improved, and the power consumption is reduced; the isolation communication circuit isolates the data information between the metering circuit and the data processing circuit, so that the isolation between the full-voltage-loss battery and an external power line is ensured, and the safety of replacing the full-voltage-loss battery is improved.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. The utility model provides an electric energy meter, its characterized in that, the electric energy meter is connected between electric power circuit and user terminal circuit, the electric energy meter includes: the sampling circuit, the data processing circuit, the metering circuit, the power supply circuit and the isolation communication circuit, wherein,
the sampling circuit is respectively connected with the power circuit, the power circuit and the data processing circuit and is used for collecting the voltage of the power circuit and converting the amplitude of the voltage to obtain a sampling voltage;
the metering circuit is respectively connected with the user terminal line, the power supply circuit, the isolation communication circuit and the data processing circuit and is used for collecting the voltage and the current of the user terminal line;
the isolation communication circuit is respectively connected with the power supply circuit, the metering circuit and the data processing circuit and is used for isolating the voltage and the current of the user terminal line acquired by the metering circuit and then transmitting the isolated voltage and the isolated current to the data processing circuit;
the data processing circuit is respectively connected with the metering circuit, the sampling circuit, the power supply circuit and the isolation communication circuit and is used for comparing the sampling voltage with a preset threshold value, judging whether the power line is powered down or not and whether the power line power down duration exceeds a preset time, entering a low-power consumption operation mode when the power line is judged to be powered down, and sending a closing signal to the power supply circuit and the isolation communication circuit when the power line power down duration exceeds the preset time; detecting total voltage loss according to the voltage and current of the user terminal line, and judging the running state of the user terminal line; after the full-voltage-loss detection is completed, a disconnection signal is sent to the power supply circuit and the isolation communication circuit;
the power supply circuit is respectively connected with the power circuit, the sampling circuit, the metering circuit, the isolation communication circuit and the data processing circuit and is used for supplying power to the metering circuit, the isolation communication circuit and the data processing circuit according to the closing signal; and according to the disconnection signal, disconnecting the metering circuit and the isolation communication circuit.
2. The electrical energy meter of claim 1, further comprising:
the power conversion circuit is respectively connected with the power line, the sampling circuit, the metering circuit, the isolation communication circuit and the data processing circuit and is used for supplying power to the metering circuit, the isolation communication circuit and the data processing circuit after the voltage of the power line is subjected to voltage conversion.
3. The electrical energy meter of claim 2, wherein the power circuit comprises:
the first power supply circuit is respectively connected with the power line, the sampling circuit, the power conversion circuit, the isolation communication circuit, the metering circuit and the data processing circuit and is used for supplying power to the sampling circuit, the metering circuit and the isolation communication circuit according to a first closing signal when the power-down duration of the power line exceeds a preset time; after the full-voltage-loss detection is completed, stopping supplying power to the sampling circuit, the metering circuit and the isolation communication circuit according to the first disconnection signal;
the second power circuit is respectively connected with the data processing module, the power conversion circuit and the isolation communication circuit and is used for supplying power to the data processing module and the isolation communication circuit according to a second closing signal when the power-down duration time of the power circuit exceeds the preset time; and after the full-voltage-loss detection is completed, disconnecting the communication circuit from the isolation communication circuit according to the second disconnection signal.
4. The electrical energy meter of claim 3, wherein the isolated communication circuit comprises: a high-speed isolation communication circuit and a control circuit, wherein,
the high-speed isolation communication circuit is respectively connected with the first power supply circuit, the metering circuit, the data processing circuit and the power supply conversion circuit and is used for isolating the voltage and the current of the user terminal line collected by the metering circuit and then transmitting the isolated voltage and the isolated current to the data processing circuit;
the control circuit is respectively connected with the second power supply circuit, the power supply conversion circuit and the high-speed isolation communication circuit and is used for connecting the second power supply circuit with the high-speed isolation communication circuit according to the second closing signal so that the second power supply circuit supplies power for the high-speed isolation communication circuit; and according to a second disconnection signal, disconnecting the second power supply circuit from the high-speed isolation communication circuit.
5. The electrical energy meter of claim 4, wherein the first power circuit comprises: an isolation control circuit and a first tank circuit, wherein,
the isolation control circuit is respectively connected with the first energy storage circuit, the data processing circuit and the power supply conversion circuit and is used for connecting the first energy storage circuit with the metering circuit according to the first closing signal so that the first energy storage circuit supplies power for the sampling circuit, the metering circuit and the high-speed isolation communication circuit; according to the first disconnection signal, stopping the first energy storage circuit from supplying power to the sampling circuit, the metering circuit and the high-speed isolation communication circuit;
the first energy storage circuit is respectively connected with the sampling circuit, the power conversion circuit and the isolation control circuit and is used for storing energy when the power line is normal; when the power line is powered down, the power line is connected with the metering circuit, and the stored energy is subjected to voltage conversion to supply power for the sampling circuit, the metering circuit and the high-speed isolation communication circuit.
6. The electrical energy meter of claim 5, wherein the second power circuit comprises: a second energy storage circuit and a voltage conversion circuit, wherein,
the second energy storage circuit is connected with the voltage conversion circuit and is used for supplying power to the data processing circuit and the isolation communication circuit;
the voltage conversion circuit is respectively connected with the second energy storage circuit, the data processing circuit and the control circuit and is used for supplying power to the data processing circuit and the isolation communication circuit after converting the voltage of the second energy storage circuit according to the second closing signal; and according to the disconnection signal, disconnecting the connection with the second energy storage circuit, so that the second energy storage circuit stops supplying power to and isolating the communication circuit.
7. The electrical energy meter of claim 1, wherein the data processing circuit is further configured to calibrate parameters of the metering circuit.
8. A method for detecting total voltage loss of an electric energy meter, characterized in that the method comprises, based on the electric energy meter according to any one of claims 1 to 7:
the sampling circuit collects the voltage of the power line in real time;
the data processing circuit judges whether the power line is powered down according to the voltage of the power line and a preset threshold value, and controls the electric energy meter to enter a low-power consumption operation mode after judging that the power line is powered down;
the data processing circuit controls the power supply state of the power supply circuit according to a first preset control method, and the metering circuit meters the voltage and the current of the user terminal circuit;
the data processing circuit carries out full-decompression processing according to the voltage and the current of the user side line, judges the running state of the user side line and generates a judging result of the running state of the user side line;
the data processing circuit controls the power supply state of the power supply circuit according to a second preset control method;
the data processing circuit controls the electric energy meter to enter a low-power consumption operation mode.
9. The method for detecting total voltage loss of an electric energy meter according to claim 8, wherein the data processing circuit controls the power supply state of the power supply circuit according to a first preset control method, and the metering circuit meters the voltage and current of the user terminal line, comprising:
the data processing circuit judges whether the power failure duration of the power line reaches a first preset time according to the voltage of the power line;
when the power-down duration of the power line reaches a first preset time, the data processing circuit sequentially sends a first closing signal to the first power circuit and a second closing signal to the second power circuit;
the data processing circuit configures meter calibrating parameters of the metering circuit, and the metering circuit performs meter calibrating according to the meter calibrating parameters;
the data processing circuit judges whether the power failure duration of the power line reaches a second preset time according to the voltage of the power line;
when the power line power-down duration reaches a second preset time, the metering circuit meters the voltage and the current of the user terminal line.
10. The method for detecting total voltage loss of an electric energy meter according to claim 8, wherein the process of controlling the power supply state of the power supply circuit by the data processing circuit according to the second preset control method comprises the steps of:
the data processing circuit sequentially sends a first disconnection signal to the first power supply circuit and a second disconnection signal to the second power supply circuit.
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