Electric energy metering error automatic compensation electric energy meter

Abstract

The invention discloses an electric energy metering error automatic compensation electric energy meter, and relates to the technical field of electric energy meters, current and voltage signals are accurately collected through a current signal sampling unit and a voltage signal sampling unit, and the high-speed processing capability of a microprocessor is combined, so that the electric energy metering precision is improved, and errors are reduced; the sensor unit can monitor the working environment of the electric energy meter, so that the electric energy meter can perform automatic compensation in different environments, and the adaptability is high; the automation and intelligence of the electric energy meter are improved by adopting the microprocessor; electrical isolation is realized, and the safety, reliability and anti-interference capability of the electric energy meter are improved. According to the technical scheme, the device is characterized in that the device comprises a shell, a circuit board, a current transformer, a voltage transformer and a display, and the circuit board comprises an electric energy metering unit, a current signal sampling unit, a voltage signal sampling unit, a storage unit, a sensor unit, an A / D conversion unit and a microprocessor. The method is used for electric energy metering error automatic compensation of the electric energy meter.

Description

Technical Field

[0001] The invention relates to the technical field of electric energy meters, and in particular to an electric energy meter with automatic compensation for electric energy measurement errors. Background Art

[0002] An energy meter, also known as an electric meter or energy meter, is a device used to measure and record the consumption of electrical energy. Energy meters are usually installed in homes, commercial buildings or industrial facilities to measure the amount of electrical energy consumed by users within a certain period of time, where the electrical energy is usually measured in kilowatt-hours (kWh). With the rapid development of my country's economy, the demand for energy meters in all walks of life is increasing. The energy measurement error of an energy meter refers to the difference between the actual measured value and the true value caused by various reasons when the energy meter measures electrical energy. This error may be caused by a variety of factors, including the technical characteristics of the energy meter itself, external environmental conditions, installation and operation methods, etc. Therefore, it is very important to compensate for the energy measurement error.

[0003] The existing technology usually uses hardware compensation methods to achieve energy metering error compensation, that is, to achieve error compensation by adjusting the hardware settings of the energy meter. The specific method is: adjusting the resistor divider network, by adjusting the resistance value of the resistor divider network for voltage sampling, changing the amplitude of the sampling voltage of the metering chip, and then changing the output frequency of the metering pulse to achieve metering error correction.

[0004] The biggest disadvantage of the above-mentioned energy metering error compensation method using a resistor network is that it cannot achieve electrical isolation. Electrical isolation is essential for protecting the safety of circuits and operators, especially in high-voltage environments, where lack of isolation increases safety risks. The resistance value in the resistor divider network changes with temperature, which can cause the metering error of the energy meter to change with changes in ambient temperature. Summary of the invention

[0005] The present invention provides an electric energy meter with automatic compensation for electric energy measurement errors. The electric energy meter can accurately collect current and voltage signals through a current signal sampling unit and a voltage signal sampling unit, and the high-speed processing capability of a microprocessor is combined to improve the accuracy of electric energy measurement and reduce errors. The sensor unit can monitor the working environment of the electric energy meter, so that the electric energy meter can automatically compensate in different environments and has strong adaptability. The microprocessor is used to improve the automation and intelligence of the electric energy meter; electrical isolation is achieved, and the safety, reliability and anti-interference ability of the electric energy meter are improved.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme: The present invention provides an electric energy meter with automatic compensation for electric energy measurement errors, comprising: a shell, a circuit board, a current transformer, a voltage transformer and a display; the circuit board is installed inside the shell and is used for electric energy measurement and data processing; the current transformer is installed inside the shell and connected to the input end of the circuit board, and is used to measure the current flowing through the electric energy meter; the voltage transformer is installed inside the shell and connected to the input end of the circuit board, and is used to measure the voltage of the electric energy meter; the display is embedded in the shell and connected to the output end of the circuit board, and is used to display the electrical parameters of the electric energy meter; the circuit board comprises: an electric energy metering unit, a current signal sampling unit, a voltage signal sampling unit, a storage unit, a sensor unit, an A / D conversion unit and a microprocessor.

[0007] The electric energy metering unit is respectively connected to the current signal sampling unit, the voltage signal sampling unit and the microprocessor for calculating the electric energy consumption.

[0008] The current signal sampling unit is connected to the current transformer, the electric energy metering unit and the A / D conversion unit respectively, and is used to receive the current signal from the current transformer and input it into the electric energy metering unit via the A / D conversion unit.

[0009] The voltage signal sampling unit is connected to the voltage transformer, the electric energy metering unit and the A / D conversion unit respectively, and is used to receive the voltage signal from the voltage transformer and input it into the electric energy metering unit via the A / D conversion unit.

[0010] The storage unit is connected to the microprocessor and is used to store the operating parameters, historical data and billing information of the electric energy meter.

[0011] The sensor unit is connected to the microprocessor and is used to monitor the working environment of the electric energy meter.

[0012] The A / D conversion unit is connected to the current signal sampling unit, the voltage signal sampling unit and the microprocessor respectively, and is used to convert analog signals into digital signals.

[0013] The microprocessor is respectively connected to the electric energy metering unit, the storage unit, the sensor unit and the A / D conversion unit for calculating electric energy parameters.

[0014] Furthermore, in the electric energy meter with automatic compensation for electric energy measurement error, the current signal sampling unit comprises: Resistor R1, resistor R2, resistor R3, a common negative terminal VSS, a ground terminal S1, a capacitor C1 and a capacitor C2.

[0015] The resistor R1, the resistor R2 and the resistor R3 are connected in series, the capacitor C1 and the capacitor C2 are connected in series, the capacitor C1 and the resistor R2 are connected in series, the capacitor C2 and the resistor R3 are connected in series, the common negative terminal VSS is connected to the resistor R3, and the ground terminal S1 is located between the capacitor C1 and the capacitor C2.

[0016] Furthermore, in the electric energy meter with automatic compensation for electric energy measurement error, the voltage signal sampling unit comprises: Resistor R4, resistor R5, resistor R6, capacitor C3, capacitor C4 and ground terminal S2.

[0017] The resistor R4 and the resistor R5 are connected in series, the resistor R5 and the resistor R6 are connected in parallel, the capacitor C3 and the capacitor C4 are connected in parallel, the capacitor C3 and the resistor R5 are connected in parallel, the capacitor C4 and the resistor R6 are connected in parallel, and the ground terminal S2 is connected to the capacitor C3.

[0018] Furthermore, in the electric energy meter with automatic compensation for electric energy measurement error, the circuit board further comprises: a timer; The timer is connected to the microprocessor and is used to realize timing and timing functions.

[0019] Furthermore, in the electric energy meter with automatic compensation for electric energy measurement errors, the circuit board also includes: a load circuit adjustment unit.

[0020] The load circuit adjustment unit is connected to the microprocessor and is used to adjust the load.

[0021] Furthermore, in the electric energy meter with automatic compensation for electric energy measurement errors, the circuit board also includes: a compensation output unit.

[0022] The compensation output unit is connected to the display and the microprocessor respectively, and is used for error compensation of electric energy metering and outputting electric parameters to the display.

[0023] Furthermore, in the electric energy meter with automatic compensation for electric energy measurement error, the microprocessor comprises: The microprocessor comprises an information processing module, which is located in the microprocessor and is used for data analysis and processing.

[0024] Furthermore, in the electric energy meter with automatic compensation for electric energy measurement error, the microprocessor further comprises: The microprocessor further comprises a communication module, which is located in the microprocessor and is used for data transmission and communication.

[0025] Furthermore, in the electric energy meter with automatic compensation for electric energy measurement error, the sensor unit comprises: The sensor unit includes but is not limited to a temperature sensor, a humidity sensor, an air pressure sensor, and a magnetic field sensor.

[0026] Furthermore, the electric energy meter with automatic compensation for electric energy measurement error, the electric energy consumption includes: The electric energy consumption includes but is not limited to active power, reactive power and electric energy accumulation.

[0027] The present invention provides an electric energy meter with automatic compensation for electric energy measurement errors, comprising a housing, a circuit board, a current transformer, a voltage transformer and a display, wherein the circuit board comprises: an electric energy metering unit, a current signal sampling unit, a voltage signal sampling unit, a storage unit, a sensor unit, an A / D conversion unit and a microprocessor. Compared with the prior art, the present invention accurately collects current and voltage signals through the current signal sampling unit and the voltage signal sampling unit, and combines the high-speed processing capability of the microprocessor to improve the accuracy of electric energy measurement and reduce errors; the sensor unit can monitor the working environment of the electric energy meter, so that the electric energy meter can automatically compensate in different environments and has strong adaptability; the microprocessor is used to improve the automation and intelligence of the electric energy meter; electrical isolation is achieved, and the safety, reliability and anti-interference ability of the electric energy meter are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. The drawings are only used to illustrate the implementation methods and are not to be considered as limitations of the present invention.

[0029] Figure 1 A schematic diagram of the structure of an electric energy meter with automatic compensation for electric energy measurement errors according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the circuit board structure in the electric energy meter with automatic compensation for electric energy measurement errors in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the circuit board structure in the electric energy meter with automatic compensation for electric energy measurement errors in Embodiment 2 of the present invention; Figure 4 A circuit diagram of a current signal sampling unit in an embodiment of the present invention; Figure 5 The figure is a circuit diagram of a voltage signal sampling unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by technicians in the field of the present invention; the terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings, and are intended to cover non-exclusive inclusions.

[0032] In the description of the embodiments of the present invention, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0033] In the description of the embodiments of the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0034] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0035] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0036] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances. Example

[0037] The embodiment of the present invention provides an electric energy meter with automatic compensation error for electric energy measurement, such as Figure 1 As shown, it includes: a housing 11, a circuit board 12, a current transformer 13, a voltage transformer 14 and a display 15; the circuit board 12 is installed inside the housing 11 and is used for electric energy measurement and data processing; the current transformer 13 is installed inside the housing 11 and connected to the input end of the circuit board 12, and is used to measure the current flowing through the electric energy meter; the voltage transformer 14 is installed inside the housing 11 and connected to the input end of the circuit board 12, and is used to measure the voltage of the electric energy meter; the display 15 is embedded in the housing 11 and connected to the output end of the circuit board 12, and is used to display the electrical parameters of the electric energy meter.

[0038] The housing 11 is an important part of the electric energy meter, which not only protects the internal components of the electric energy meter from the influence of the external environment, but also involves the safety, stability and durability of the electric energy meter. Generally, the material of the housing 1 can be engineering plastics, ductile iron, stainless steel castings, cast lead brass, cast aluminum alloy, etc.

[0039] The printed circuit board 12 (PCB) is a support for electronic components, that is, all electronic components of the electric energy meter are integrated thereon and the electrical connection between the electronic components is realized. In the electric energy meter of this embodiment, the printed circuit board 12 is one of the core components and is used for electric energy measurement and data processing.

[0040] A current transformer (CT) is a power system measuring device that works on the principle of electromagnetic induction. Its main function is to convert the large current value in a high current circuit into a small current signal that can be received and processed by instruments, protection devices, recorders and other equipment.

[0041] Voltage Transformer (VT) is an electrical device used to measure and monitor high voltage in power systems. It converts high voltage signals into low voltage output signals to facilitate the operation of measurement and protection equipment.

[0042] The display 15 is an important component of the electric energy meter and is the user interface of the electric energy meter. It is used to display the electric parameters of the electric energy meter, such as electric energy consumption, remaining power, voltage, current, etc. The user can read the data of the electric energy meter intuitively through the display 15. The display 15 can be an LED digital tube or an LCD liquid crystal display.

[0043] like Figure 2 As shown, the circuit board 12 includes: an electric energy metering unit 121 , a current signal sampling unit 122 , a voltage signal sampling unit 123 , a storage unit 124 , a sensor unit 125 , an A / D conversion unit 126 and a microprocessor 127 .

[0044] The electric energy metering unit 121 is respectively connected to the current signal sampling unit 122 , the voltage signal sampling unit 123 and the microprocessor 127 for calculating the electric energy consumption.

[0045] Among them, the electric energy metering unit 121 is the core part of the electric energy meter, which is used to calculate the electric energy consumption. Its working principle is: the current signal collected by the current signal sampling unit 122 and the voltage signal collected by the voltage signal sampling unit 123 are converted into corresponding digital signals through the A / D conversion unit 126, the current digital signal and the voltage digital signal enter the digital multiplier for multiplication, and the output is a DC voltage proportional to the average power over a period of time. The DC voltage is converted into a corresponding pulse frequency, and the corresponding electric energy consumption data is displayed through frequency division and counter counting. The optional models of the electric energy metering unit 121 are ATT7022B, ADE7880, HT7017, or HLW8012.

[0046] The current signal sampling unit 122 is respectively connected to the current transformer 13 , the electric energy metering unit 121 and the A / D conversion unit 126 , and is used to receive the current signal from the current transformer 13 and input it to the electric energy metering unit 121 via the A / D conversion unit 126 .

[0047] Based on Ohm's law, the current signal sampling unit 122 can calculate the current flowing through a known resistor through the voltage drop of the resistor, and thus obtain the sampled current flowing through the circuit. The specific calculation formula is:

[0048]

[0049] in, Indicates voltage, represents the sampling current, Indicates resistance.

[0050] The voltage signal sampling unit 123 is connected to the voltage transformer 14 , the electric energy metering unit 121 and the A / D conversion unit 126 respectively, and is used to receive the voltage signal from the voltage transformer 14 and input it to the electric energy metering unit 121 via the A / D conversion unit 126 .

[0051] The voltage signal sampling unit 123 can obtain a sampling voltage proportional to the input voltage through resistor voltage division. The specific calculation formula is:

[0052] in, represents the sampling voltage, Indicates the input voltage, represents the total resistance, Represents the sampling resistor.

[0053] According to the electric energy calculation formula:

[0054] in, Represents electrical energy, Indicates power, Indicates time, represents the sampling voltage, Indicates the sampling current.

[0055] Through the above calculation, the power consumption data within a certain period of time can be obtained. It should be noted here that in the AC circuit, the power factor should also be considered, and the power calculation formula is:

[0056] in, Indicates power, represents the sampling voltage, represents the sampling current, Represents the phase angle between the sampled voltage and the sampled current.

[0057] The storage unit 124 is connected to the microprocessor 127 and is used to store the operating parameters, historical data and billing information of the electric energy meter.

[0058] The storage unit 124 is an important component of the electric energy meter, and its core function is to store binary data, i.e., 0 and 1. The binary data can represent all the information and instructions of the electric energy meter through different combinations and arrangements, such as: operating parameters, historical data, and billing information of the electric energy meter. Specifically, the storage unit 124 can be IM1281B, BL6503E, ADE9153A, or CS5467.

[0059] The sensor unit 125 is connected to the microprocessor 127 and is used to monitor the working environment of the electric energy meter.

[0060] Among them, the sensor unit 125 includes at least one sensor, which is a detection device that can sense the information to be measured and convert it into an electrical signal or other required form of information output according to a certain rule to meet the requirements of information transmission, processing, storage, display, recording and control. The working principle of the sensor unit 125 is: the sensor senses or receives the physical quantity to be measured through a specific sensitive element (such as a photosensitive element, a pressure sensor, a temperature sensor, etc.); the sensor converts the sensed physical quantity into an electrical signal; the circuit or chip inside the sensor processes and amplifies the converted electrical signal; the sensor outputs the processed electrical signal to an external device or system for further analysis, display and control. The sensor unit 125 of this embodiment includes but is not limited to a temperature sensor, a humidity sensor, an air pressure sensor and a magnetic field sensor.

[0061] The A / D conversion unit 126 is connected to the current signal sampling unit 122 , the voltage signal sampling unit 123 and the microprocessor 127 respectively, and is used to convert the analog signal into a digital signal.

[0062] The A / D conversion unit 126 (analog-to-digital converter) is a device that converts an external analog signal into a digital signal that can be processed by a computer or a digital circuit. Its working principle is: measuring the value of the analog signal at a specific moment; mapping the analog signal value to a digital signal; converting the digital signal into a digital representation in binary or other coded forms. Specifically, the A / D conversion unit 126 can be ADC0804, ADS1100, TLV320ADC3101 or ADS131M08.

[0063] The microprocessor 127 is respectively connected to the electric energy metering unit 121 , the storage unit 124 , the sensor unit 125 and the A / D conversion unit 126 for calculating electric energy parameters.

[0064] The microprocessor 127 is an integrated circuit in the electric energy meter, which executes program instructions, processes data, and controls other electric energy meter hardware such as the storage unit 124, the sensor unit 125, etc. The working principle of the microprocessor 127 is: obtain current and voltage information from the current signal sampling unit 122 and the voltage signal sampling unit 123 respectively, obtain the electric energy meter state information from the sensor unit 125, and obtain the digital information of the analog signal from the A / D conversion unit 126; process the electric energy meter state information and digital information, including but not limited to filtering, amplification, and analog-to-digital conversion; calculate the electric energy consumption according to the electric energy calculation formula; and store the calculation results and intermediate data in the storage unit 124. Specifically, the microprocessor 127 can be selected from FM3308 or RX651.

[0065] The embodiment of the present invention provides an electric energy meter with automatic compensation for electric energy measurement errors, comprising a housing, a circuit board, a current transformer, a voltage transformer and a display, wherein the circuit board comprises: an electric energy metering unit, a current signal sampling unit, a voltage signal sampling unit, a storage unit, a sensor unit, an A / D conversion unit and a microprocessor. Compared with the prior art, the embodiment of the present invention accurately collects current and voltage signals through the current signal sampling unit and the voltage signal sampling unit, and combines the high-speed processing capability of the microprocessor to improve the accuracy of electric energy measurement and reduce errors; the sensor unit can monitor the working environment of the electric energy meter, so that the electric energy meter can automatically compensate in different environments and has strong adaptability; the use of a microprocessor improves the automation and intelligence of the electric energy meter; electrical isolation is achieved, and the safety, reliability and anti-interference ability of the electric energy meter are improved. Example

[0066] The embodiment of the present invention provides an electric energy meter with automatic compensation error for electric energy measurement, such as Figure 1 As shown, it includes: a housing 11, a circuit board 12, a current transformer 13, a voltage transformer 14 and a display 15; the circuit board 12 is installed inside the housing 11 and is used for electric energy measurement and data processing; the current transformer 13 is installed inside the housing 11 and connected to the input end of the circuit board 12, and is used to measure the current flowing through the electric energy meter; the voltage transformer 14 is installed inside the housing 11 and connected to the input end of the circuit board 12, and is used to measure the voltage flowing through the electric energy meter; the display 15 is embedded in the housing 11 and connected to the output end of the circuit board 12, and is used to display the electrical parameters of the electric energy meter.

[0067] like Figure 3 As shown, the circuit board 12 includes: an electric energy metering unit 121 , a current signal sampling unit 122 , a voltage signal sampling unit 123 , a storage unit 124 , a sensor unit 125 , an A / D conversion unit 126 and a microprocessor 127 .

[0068] The electric energy metering unit 121 is respectively connected to the current signal sampling unit 122 , the voltage signal sampling unit 123 and the microprocessor 127 for calculating the electric energy consumption.

[0069] Among them, the power consumption includes but is not limited to active power, reactive power and accumulated power. The following is the calculation formula for active power, reactive power and accumulated power:

[0070] in, Indicates active power, represents the sampling voltage, represents the sampling current, Represents the phase angle between the sampled voltage and the sampled current.

[0071]

[0072] in, Represents reactive power, represents the sampling voltage, represents the sampling current, Represents the phase angle between the sampled voltage and the sampled current.

[0073]

[0074] in, Indicates the accumulated electrical energy. Indicates active power, Indicates time.

[0075] In summary, in an actual electric energy meter, the calculation of these parameters is usually completed by the electric energy metering unit 121 or the microprocessor 127. It calculates the active power and reactive power by sampling the voltage and sampling the current, and integrates the active power to obtain the accumulated electric energy for display and billing.

[0076] The current signal sampling unit 122 is respectively connected to the current transformer 13 , the electric energy metering unit 121 and the A / D conversion unit 126 , and is used to receive the current signal from the current transformer 13 and input it to the electric energy metering unit 121 via the A / D conversion unit 126 .

[0077] The voltage signal sampling unit 123 is connected to the voltage transformer 14 , the electric energy metering unit 121 and the A / D conversion unit 126 respectively, and is used to receive the voltage signal from the voltage transformer 14 and input it to the electric energy metering unit 121 via the A / D conversion unit 126 .

[0078] The storage unit 124 is connected to the microprocessor 127 and is used to store the operating parameters, historical data and billing information of the electric energy meter.

[0079] The sensor unit 125 is connected to the microprocessor 127 and is used to monitor the working environment of the electric energy meter.

[0080] In this embodiment, the sensor unit 125 includes but is not limited to a temperature sensor, a humidity sensor, an air pressure sensor, and a magnetic field sensor.

[0081] Among them, the temperature sensor is a sensor that can sense temperature and convert it into a usable output signal. Currently, there are mainly thermocouple temperature sensors, thermistor temperature sensors and digital temperature sensors on the market for selection.

[0082] A humidity sensor is a device used to measure the relative humidity in the air. Currently, there are mainly water molecule affinity type humidity sensors, non-water molecule affinity type humidity sensors and resistive humidity sensors on the market for selection.

[0083] A pressure sensor is a device that can measure and convert changes in gas pressure. Currently, there are mainly absolute pressure sensors, gauge pressure sensors, vacuum pressure sensors and differential pressure sensors on the market for selection.

[0084] A magnetic field sensor is a device that can detect the strength and direction of a magnetic field. Currently, there are Hall element magnetic field sensors, magnetoresistive magnetic field sensors, magnetic capacitance magnetic field sensors, magnetic induction magnetic field sensors and magnetic inductance magnetic field sensors on the market for selection.

[0085] The A / D conversion unit 126 is connected to the current signal sampling unit 122 , the voltage signal sampling unit 123 and the microprocessor 127 respectively, and is used to convert the analog signal into a digital signal.

[0086] The microprocessor 127 is respectively connected to the electric energy metering unit 121 , the storage unit 124 , the sensor unit 125 and the A / D conversion unit 126 for calculating electric energy parameters.

[0087] Preferably, the electric energy meter with automatic compensation of electric energy measurement error, the microprocessor 127 comprises: The microprocessor 127 includes an information processing module 2271 , which is located in the microprocessor and is used for data analysis and processing.

[0088] In the electric energy meter of this embodiment, the information processing module 2271 also needs to calculate the compensation value according to environmental factors (such as temperature, humidity, etc.) and internal calibration data, and adjust the electric energy measurement result to improve the measurement accuracy. The compensation value calculation formula is:

[0089] in, represents the measured electrical energy, Represents the real electrical energy, Indicates the compensation coefficient.

[0090] Preferably, in the electric energy meter with automatic compensation for electric energy measurement error, the microprocessor 127 further comprises: The microprocessor further includes a communication module 2272, which is located in the microprocessor and is used for data transmission and communication.

[0091] Among them, the communication module 2272 is a key part for realizing data transmission and communication in the electric energy meter, which enables the electric energy meter to exchange information with the external system. For example, the communication module 2272 can transmit the electric energy data (such as electric energy consumption, voltage, current, etc.) of the electric energy meter to the central control system or other monitoring equipment. Through the communication module 2272, the operator can also remotely monitor the working status of the electric energy meter and send control instructions, such as remotely starting or stopping the electric energy meter, adjusting parameter settings, etc.

[0092] Preferably, Figure 4 As shown, the current signal sampling unit 122 includes: Resistor R1, resistor R2, resistor R3, a common negative terminal VSS, a ground terminal S1, a capacitor C1 and a capacitor C2.

[0093] Resistors R1, R2 and R3 are connected in series, capacitors C1 and C2 are connected in series, capacitor C1 and resistor R2 are connected in series, capacitor C2 and resistor R3 are connected in series, a common negative terminal VSS is connected to resistor R3, and a ground terminal S1 is located between capacitor C1 and capacitor C2.

[0094] Preferably, Figure 5 As shown, the voltage signal sampling unit 123 includes: Resistor R4, resistor R5, resistor R6, capacitor C3, capacitor C4 and ground terminal S2.

[0095] The resistor R4 and the resistor R5 are connected in series, the resistor R5 and the resistor R6 are connected in parallel, the capacitor C3 and the capacitor C4 are connected in parallel, the capacitor C3 and the resistor R5 are connected in parallel, the capacitor C4 and the resistor R6 are connected in parallel, and the ground terminal S2 is connected to the capacitor C3.

[0096] Preferably, the electric energy meter with automatic compensation of electric energy measurement errors, the circuit board 12 also includes: a timer 228.

[0097] The timer 228 is connected to the microprocessor 127 to implement timing and timing functions.

[0098] Among them, the most basic function of timer 228 is to realize accurate time interval timing. By configuring the prescaler and automatic reload value of the timer, a specific time interval can be set to realize periodic timing tasks. The core of timer 228 is a counter that can count by adding 1 (or subtracting 1). Every time a counting signal appears, the counter automatically adds 1 (or automatically subtracts 1). When the count value reaches the preset value, the timer makes an interrupt request to the microprocessor. The counting signal can come from a periodic internal clock signal (such as a timing function) or a non-periodic external input signal (such as a counting function). Timer 228 can use STM32 series timers, RN821X series timers, PIC series timers or ATmega series timers.

[0099] Preferably, the electric energy meter with automatic compensation for electric energy measurement errors, the circuit board 12 further includes: a load circuit adjustment unit 229 .

[0100] The load circuit adjustment unit 229 is connected to the microprocessor 127 and is used to adjust the load.

[0101] The load circuit adjustment unit 229 refers to a circuit part used to adjust and control the load in the electric energy meter. It can dynamically adjust the load according to the working state and external conditions of the electric energy meter to optimize the performance and response of the electric energy meter. Specifically, the load circuit adjustment unit 229 can be selected from TPS65021, AD5758 or a digital potentiometer.

[0102] Preferably, the electric energy meter with automatic compensation for electric energy measurement error, the circuit board 12 further includes: a compensation output unit 2210; The compensation output unit 2210 is connected to the display 15 and the microprocessor 127 respectively, and is used for error compensation of electric energy measurement and outputting electric parameters to the display 15 .

[0103] The compensation output unit 2210 is mainly used to realize error compensation of electric energy metering. It ensures the accuracy and reliability of the measurement result by adjusting the output of the electric energy meter. Specifically, the compensation output unit 2210 calculates the compensation value according to the temperature, humidity, air pressure, magnetic field strength and other data collected by the sensor unit 125:

[0104] in, Indicates the compensation value, represents the compensation value under reference conditions, Indicates temperature, represents the reference temperature, represents the temperature coefficient, Indicates humidity, Indicates the reference humidity, represents the humidity coefficient, Indicates air pressure, Indicates the reference air pressure, represents the air pressure coefficient, represents the magnetic field strength, represents the reference magnetic field strength, Represents the magnetic field coefficient.

[0105] It should be noted here that the detailed description of each component structure of this embodiment can refer to other embodiments and will not be repeated here.

[0106] The embodiment of the present invention provides an electric energy meter with automatic compensation for electric energy measurement errors, comprising a housing, a circuit board, a current transformer, a voltage transformer and a display, wherein the circuit board comprises: an electric energy metering unit, a current signal sampling unit, a voltage signal sampling unit, a storage unit, a sensor unit, an A / D conversion unit and a microprocessor. Compared with the prior art, the embodiment of the present invention accurately collects current and voltage signals through the current signal sampling unit and the voltage signal sampling unit, and combines the high-speed processing capability of the microprocessor to improve the accuracy of electric energy measurement and reduce errors; the sensor unit can monitor the working environment of the electric energy meter, so that the electric energy meter can automatically compensate in different environments and has strong adaptability; the use of a microprocessor improves the automation and intelligence of the electric energy meter; electrical isolation is achieved, and the safety, reliability and anti-interference ability of the electric energy meter are improved.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An electric energy meter with automatic compensation for electric energy measurement error, comprising: Housing, circuit boards, current transformers, voltage transformers and displays; The circuit board is installed inside the housing and is used for electric energy measurement and data processing; The current transformer is installed inside the housing and connected to the input end of the circuit board, and is used to measure the current flowing through the electric energy meter; the voltage transformer is installed inside the housing and connected to the input end of the circuit board, and is used to measure the voltage of the electric energy meter; the display is embedded in the housing and connected to the output end of the circuit board, and is used to display the electrical parameters of the electric energy meter; it is characterized in that the circuit board includes: an electric energy metering unit, a current signal sampling unit, a voltage signal sampling unit, a storage unit, a sensor unit, an A / D conversion unit and a microprocessor; The electric energy metering unit is respectively connected to the current signal sampling unit, the voltage signal sampling unit and the microprocessor, and is used to calculate the electric energy consumption; The current signal sampling unit is connected to the current transformer, the electric energy metering unit and the A / D conversion unit respectively, and is used to receive the current signal from the current transformer and input it into the electric energy metering unit via the A / D conversion unit; The voltage signal sampling unit is connected to the voltage transformer, the electric energy metering unit and the A / D conversion unit respectively, and is used to receive the voltage signal from the voltage transformer and input it into the electric energy metering unit via the A / D conversion unit; The storage unit is connected to the microprocessor and is used to store the operating parameters, historical data and billing information of the electric energy meter; The sensor unit is connected to the microprocessor and is used to monitor the working environment of the electric energy meter; The A / D conversion unit is connected to the current signal sampling unit, the voltage signal sampling unit and the microprocessor respectively, and is used to convert the analog signal into a digital signal; The microprocessor is respectively connected to the electric energy metering unit, the storage unit, the sensor unit and the A / D conversion unit for calculating electric energy parameters.

2. The electric energy meter with automatic compensation for electric energy measurement error according to claim 1, characterized in that: The current signal sampling unit comprises: Resistor R1, resistor R2, resistor R3, common negative terminal VSS, ground terminal S1, capacitor C1 and capacitor C2; The resistor R1, the resistor R2 and the resistor R3 are connected in series, the capacitor C1 and the capacitor C2 are connected in series, the capacitor C1 and the resistor R2 are connected in series, the capacitor C2 and the resistor R3 are connected in series, the common negative terminal VSS is connected to the resistor R3, and the ground terminal S1 is located between the capacitor C1 and the capacitor C2.

3. The electric energy meter with automatic compensation for electric energy measurement error according to claim 1, characterized in that: The voltage signal sampling unit comprises: Resistor R4, resistor R5, resistor R6, capacitor C3, capacitor C4 and ground terminal S2; The resistor R4 and the resistor R5 are connected in series, the resistor R5 and the resistor R6 are connected in parallel, the capacitor C3 and the capacitor C4 are connected in parallel, the capacitor C3 and the resistor R5 are connected in parallel, the capacitor C4 and the resistor R6 are connected in parallel, and the ground terminal S2 is connected to the capacitor C3.

4. The electric energy meter with automatic compensation for electric energy measurement error according to claim 1, characterized in that: The circuit board also includes: a timer; The timer is connected to the microprocessor and is used to realize timing and timing functions.

5. The electric energy meter with automatic compensation for electric energy measurement error according to claim 1, characterized in that: The circuit board also includes: a load circuit adjustment unit; The load circuit adjustment unit is connected to the microprocessor and is used to adjust the load.

6. The electric energy meter with automatic compensation for electric energy measurement error according to claim 1, characterized in that: The circuit board also includes: a compensation output unit; The compensation output unit is connected to the display and the microprocessor respectively, and is used for error compensation of electric energy metering and outputting electric parameters to the display.

7. The electric energy meter with automatic compensation for electric energy measurement error according to claim 1, characterized in that: The microprocessor comprises: The microprocessor comprises an information processing module, which is located in the microprocessor and is used for data analysis and processing.

8. The electric energy meter with automatic compensation for electric energy measurement error according to claim 1, characterized in that: The microprocessor also includes: The microprocessor further comprises a communication module, which is located in the microprocessor and is used for data transmission and communication.

9. The electric energy meter with automatic compensation for electric energy measurement error according to claim 1, characterized in that: The sensor unit comprises: The sensor unit includes but is not limited to a temperature sensor, a humidity sensor, an air pressure sensor, and a magnetic field sensor.

10. The electric energy meter with automatic compensation for electric energy measurement error according to claim 1, characterized in that: The power consumption includes: The electric energy consumption includes but is not limited to active power, reactive power and electric energy accumulation.

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