Voltage influence error suppression method, electric energy meter and storage medium

Abstract

The invention discloses a voltage influence error suppression method, an electric energy meter and a storage medium. The method is applied to the electric energy meter and comprises the following steps: respectively adjusting the structure and parameters of a transformer, the structure and parameters of a manganese-copper diverter and the parameters of a metering chip; and the error variation of the electric energy meter is compensated and calibrated through the control module. From the aspect of hardware, the structure and parameters of the transformer are adjusted for an interference source, and the influence on other devices is reduced; aiming at an interfered device, the structure and parameters of the manganese-copper shunt are adjusted, so that the influence on the interfered device is reduced; parameters of the metering chip are adjusted, and relative interference is reduced. From the perspective of software, the actual error of the electric energy meter is compensated, and the voltage influence is further suppressed. By means of the method, the influence on the voltage is restrained from multiple aspects, the error change amount is stably controlled within 1% from the original standard limit value, the national standard is greatly exceeded, and the higher internal control index of an enterprise is met.

Description

Technical Field

[0001] This invention relates to the field of electricity metering technology, and in particular to a method for suppressing voltage-induced errors, an electricity meter, and a storage medium. Background Technology

[0002] As the core device for electricity metering, the accuracy of smart meters is of paramount importance. Both national and international standards have set clear and strict limits on the amount of error change (i.e., voltage effect) of electricity meters, and the higher the accuracy class of the electricity meter, the smaller the allowable change.

[0003] In practical applications, the metering error of electricity meters changes significantly when the grid voltage fluctuates, especially during "voltage influence tests." This effect is even more pronounced for smart meters that use power frequency transformers as their power supply. Specifically, the higher the influencing voltage, the stronger the magnetic field interference signal generated by the transformer, and the greater the impact on the same current test point of the smart meter. This interference has a relatively small impact on high-current load points, but for low-current load points, because the useful signal itself is weak, the relative impact of the interference signal is amplified dramatically. This often causes the error change at that test point to approach or even exceed the upper limit specified by the standard, making it difficult to meet higher or more stringent accuracy requirements.

[0004] Therefore, for low-current load points, how to control the voltage influence error within the high standard of internal control and metering accuracy requirements has become an urgent problem to be solved in this field. Summary of the Invention

[0005] This invention provides a method for suppressing voltage-induced errors, an energy meter, and a storage medium, which solves the problem in the prior art where the metering error of the energy meter is significantly increased due to transformer leakage magnetic interference under high voltage and low load current conditions.

[0006] To solve the above-mentioned technical problems, the present invention provides a voltage influence error suppression method applied to an electricity meter. The electricity meter includes a power supply module, a sampling module, a metering module, and a control module. The sampling module, metering module, and control module are connected sequentially, and the power supply module is connected to the sampling module, metering module, and control module respectively. The power supply module includes a transformer, the sampling module includes a manganese-copper shunt, and the metering module includes a metering chip. The voltage influence error suppression method includes the following steps: adjusting the structure and parameters of the transformer, the structure and parameters of the manganese-copper shunt, and the parameters of the metering chip respectively; and compensating and calibrating the change in error of the electricity meter through the control module.

[0007] In some embodiments, adjusting the structure and parameters of the transformer includes: changing the direction of the transformer core so that the direction of the main magnetic lines of force generated by the transformer is not perpendicular to the manganese-copper shunt.

[0008] In some embodiments, adjusting the structure and parameters of the transformer includes: providing a shielding winding layer inside the transformer to shield the primary winding and the secondary winding.

[0009] In some embodiments, adjusting the structure and parameters of the transformer includes increasing the number of turns in the primary winding of the transformer to 1.1 to 1.2 times the original number.

[0010] In some embodiments, adjusting the structure and parameters of the manganese copper shunt includes increasing the resistance of the manganese copper shunt to 1.15 to 1.25 times the original value.

[0011] In some embodiments, adjusting the structure and parameters of the manganese copper shunt includes: changing the length, width and height of the manganese copper shunt respectively, so that the area through which the magnetic field generated by the transformer passes perpendicularly through the manganese copper shunt is reduced to 0.75 to 0.85 times the original area.

[0012] In some embodiments, the metering chip includes an analog-to-digital converter, and adjusting the parameters of the metering chip includes increasing the analog current channel gain of the analog-to-digital converter to 1.5 times its original value.

[0013] In some embodiments, the metering chip includes a calibration parameter register, which compensates for and calibrates the error change of the energy meter through a control module. This includes: testing the energy meter under multiple preset application conditions to obtain multiple corresponding error changes; wherein the application conditions include applied voltage and applied current; converting each error change into a corresponding compensation parameter, and establishing an error parameter compensation table based on the multiple different compensation parameters; during energy meter operation, acquiring the sampled voltage and sampled current of the energy meter, and determining whether the sampled voltage and sampled current are within the preset application conditions; if so, querying the error parameter compensation table to obtain the compensation parameter under the corresponding application conditions, and writing the compensation parameter back to the calibration parameter register to compensate for the current error change of the energy meter.

[0014] This invention also provides an electricity meter, comprising: a power supply module for supplying power to the internal circuit of the electricity meter, the power supply module including a transformer; a sampling module connected to the power supply module for acquiring voltage and current signals of the electricity meter, the sampling module including a manganese copper shunt; a metering module connected to both the power supply module and the sampling module for metering electrical energy, the metering module including a metering chip; and a control module connected to both the power supply module and the metering module for controlling the power supply module and the metering module; the electricity meter performs the steps of the voltage influence error suppression method described above when it is in the production and verification stage.

[0015] The present invention also provides a readable storage medium storing a microcontroller program thereon, wherein the microcontroller program, when executed by a processor, implements the steps of the method described above.

[0016] The beneficial effects of this invention are as follows: Firstly, from a hardware perspective, this application adjusts the structure and parameters of the transformer to reduce its impact on other devices in response to interference sources. Secondly, for the interfered devices, the structure and parameters of the manganese-copper shunt are adjusted to reduce the impact of interference sources on them, and the influence of interference signals is suppressed from the perspective of the manganese-copper shunt itself. Thirdly, for the interfered devices, the parameters of the metering chip are adjusted to enhance the interference signal and reduce relative interference. Next, from a software perspective, through program design, the actual error change of the energy meter is compensated to achieve accurate correction, further suppressing voltage influence. Through the above methods, this application can suppress voltage influence from multiple aspects, and can stably control the voltage influence error change of the energy meter at the high-voltage, low-current test point from nearly the standard limit (approximately 1.5%-1.8%) to within 1%, not only meeting but also far exceeding the requirements of international and national standards, but also meeting the higher internal control indicators of enterprises for product performance, significantly improving the metering accuracy, reliability, and market competitiveness of the product. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic flowchart of a voltage-affected error suppression method according to the present invention; Figure 2 This is a block diagram of the composition of an electricity meter according to the present invention; Figure 3 This is a flowchart illustrating step S2 in a voltage influence error suppression method of the present invention; Figure 4 This is a structural diagram showing the relative positions of the transformer and the manganese-copper shunt in the prior art; Figure 5 This is a structural schematic diagram showing the relative positions of the transformer and the manganese-copper shunt in a voltage influence error suppression method of the present invention; Figure 6 This is a schematic diagram of the dimensions of a manganese-copper shunt in the prior art; Figure 7 This is a schematic diagram of the dimensions of the manganese-copper shunt in a voltage influence error suppression method of the present invention; Figure 8This is a schematic diagram of the framework of a readable storage medium according to the present invention.

[0019] Reference numerals: 1. Energy meter; 2. Power supply module; 21. Transformer; 3. Sampling module; 31. Manganese copper shunt; 4. Metering module; 41. Metering chip; 5. Control module; 100. Readable storage medium. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the accompanying drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated, and the same reference numerals denote the same elements throughout.

[0022] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0023] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0024] Please see Figure 1 , Figure 1 This is a flowchart illustrating an embodiment of the voltage influence error suppression method provided in this application. The method includes the following steps: S1: Adjust the structure and parameters of the transformer, the structure and parameters of the manganese copper shunt, and the parameters of the metering chip respectively.

[0025] S2: The control module compensates for and calibrates the change in error of the electricity meter.

[0026] Combination Figure 2As shown, the voltage influence error suppression method of this application is applied to an electricity meter 1, which includes a power supply module 2, a sampling module 3, a metering module 4, and a control module 5. The sampling module 3, metering module 4, and control module 5 are connected sequentially, and the power supply module 2 is connected to each of these modules. The power supply module 2 includes a transformer 21, the sampling module 3 includes a manganese-copper shunt 31, and the metering module 4 includes a metering chip 41.

[0027] The method of this application first addresses the issue from a hardware perspective: For the interference source, the structure and parameters of transformer 21 are adjusted to reduce its impact on other devices; for the interfered device, the structure and parameters of manganese-copper shunt 31 are adjusted to reduce the impact of the interference source, and the influence of interference signals is suppressed from the perspective of the manganese-copper shunt 31 itself; for the interfered device, the parameters of metering chip 41 are adjusted to enhance the interfered signal and reduce relative interference. Next, from a software perspective: through program design, the actual error change of energy meter 1 is compensated to achieve accurate correction, further suppressing voltage influence. Through the above methods, this application can suppress voltage influence from multiple aspects, stably controlling the voltage influence error change of energy meter 1 at the high-voltage, low-current test point from nearly the standard limit (approximately 1.5%-1.8%) to within 1%, not only meeting but far exceeding international and national standards, but also meeting the higher internal control indicators of enterprise product performance, significantly improving the metering accuracy, reliability, and market competitiveness of the product.

[0028] Specifically, please refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 Adjusting the structure and parameters of transformer 21 includes: ① changing the direction of the magnetic core of transformer 21 so that the direction of the main magnetic lines of force generated by transformer 21 is not perpendicular to the manganese-copper shunt 31; ② setting a shielding winding layer for shielding the primary and secondary windings inside transformer 21; ③ increasing the number of turns of the primary winding of transformer 21 to 1.1 to 1.2 times the original number. In this application, transformer 21 is a linear transformer.

[0029] Among them, such as Figure 4 The diagram shown is a structural schematic of the relative positions of the transformer 21 and the manganese-copper shunt 31 in the prior art, that is, the position diagram of the transformer 21 before the direction of the magnetic core is changed. Figure 5The diagram shown is a structural schematic of the relative positions of the transformer 21 and the manganese-copper shunt 31 of this application, specifically the position diagram after the direction of the magnetic core of the transformer 21 is changed. By changing the direction of the magnetic core of the transformer 21, the direction of the main magnetic lines of force generated by the magnetic core of the transformer 21 (i.e., the direction of the magnetic lines of force with the greatest interference) is made to be non-perpendicular to the manganese-copper shunt 31, thereby reducing the magnetic lines of force that pass perpendicularly through the manganese-copper shunt 31 and achieving the effect of reducing interference.

[0030] As an example, this application changes the orientation of the core of transformer 21 so that the direction of the main magnetic lines of force generated by the core of transformer 21 (i.e., the direction of the magnetic lines of force with the greatest interference) is parallel to the manganese-copper shunt 31. This parallel arrangement can further reduce the magnetic lines of force passing through the manganese-copper shunt 31, thereby further reducing interference.

[0031] Continue reading Figure 2 , Figure 4 and Figure 5 . Figure 4 The winding configuration of transformer 21 in the prior art is as follows. Figure 5 This application describes the winding configuration of the transformer 21. The transformer 21 incorporates a shielding winding layer that shields both the primary and secondary windings. By this shielding layer, interference signals generated by the transformer 21 can be suppressed from radiating to the outside, reducing their impact on the manganese-copper shunt 31.

[0032] As an example, the transformer 21 of this application has a shielding winding layer disposed between the primary winding and the secondary winding.

[0033] Continue reading Figure 2 , Figure 4 and Figure 5 . Figure 4 The coil arrangement of transformer 21 in the prior art is as follows: Figure 5 This application describes the coil configuration of transformer 21. The number of turns in the primary winding of transformer 21 is increased to 1.1 to 1.2 times the original number. Increasing the number of turns in the primary winding means that the impedance of the primary winding also increases synchronously. Under the same excitation conditions, the excitation current decreases, thus reducing the interference signal generated by the magnetic field.

[0034] For further details, please refer to Figure 1 , Figure 2 , Figure 6 , Figure 7 Adjusting the structure and parameters of the manganese copper shunt 31 includes: ① increasing the resistance of the manganese copper shunt 31 to 1.15 to 1.25 times the original value; ② changing the length, width, and height of the manganese copper shunt 31 respectively, so that the area through which the magnetic field generated by the transformer 21 passes perpendicularly through the manganese copper shunt 31 is reduced to 0.75 to 0.85 times the original value.

[0035] Among them, such as Figure 6 The diagram shown is a dimensional schematic of a manganese-copper shunt 31 in the prior art. Figure 7 The figure shown is a schematic diagram of the dimensions of the manganese copper shunt 31 of this application. Under the same overcurrent carrying capacity conditions, this application increases the resistance of the manganese copper shunt 31 to 1.15 to 1.25 times that of the original, so that the sampling signal of the manganese copper shunt 31 at the same current sampling point is increased compared with the previous one, that is, the useful signal is increased, the relative interference is reduced, and the influence of magnetic field interference signal is better suppressed.

[0036] As an example, this application increases the resistance of the manganese-copper shunt 31 from the original 260μΩ to the current 300μΩ. The specific calculation formula is as follows: in, The resistance value is the same as that of the original manganese copper shunt 31. The resistance value of the current manganese copper shunt 31 is... Represents resistivity. This represents the length of the manganese-copper shunt 31. This represents the height of the manganese-copper shunt 31. This represents the width of the manganese copper shunt 31.

[0037] Continue reading Figure 2 , Figure 6 and Figure 7 Under the same overcurrent carrying capacity conditions, this application modifies the length L, width W, and height H of the manganese copper shunt 31, reducing the area S of the magnetic field generated by the transformer 21 that passes perpendicularly through the manganese copper shunt 31 to 0.75 to 0.85 times the original area, thereby reducing the magnetic field lines passing through the manganese copper shunt 31 and thus reducing the impact of interference signals on the manganese copper shunt 31.

[0038] As an example, this application changes the length L, width W, and height H of the manganese-copper shunt 31 from the original 7mm, 1mm, and 12mm to the current 8mm, 1.5mm, and 8mm. The specific formula for calculating the area S through which the magnetic field perpendicularly passes through the manganese-copper shunt 31 is as follows: in, Let be the area through which the magnetic field passes perpendicularly through the original manganese-copper shunt 31. The area through which the magnetic field passes perpendicularly through the current manganese-copper shunt 31 This represents the length of the manganese-copper shunt 31. This represents the height of the manganese copper shunt 31.

[0039] The calculation results above show that changing the length L, width W, and height H of the manganese-copper shunt 31 reduces the area S of the magnetic field perpendicularly passing through it by 20%. .

[0040] For further details, please refer to Figure 1 , Figure 2 The metering chip 41 of this application includes an analog-to-digital converter (ADC). Adjusting the parameters of the metering chip 41 includes increasing the analog current channel gain (PGA) of the ADC to 1.5 times its original value. Increasing the coefficient of the analog current channel gain of the ADC in the metering chip 41 is equivalent to enhancing the interfered signal (i.e., the useful signal) under the same interference conditions, which can effectively reduce relative interference.

[0041] As an example, this application increases the gain coefficient of the analog current channel from 16 to 24. The specific calculation formula for the interfered signal (voltage signal value V) is as follows: in, This is the original voltage signal value. The current voltage signal value, The resistance value is the same as that of the original manganese copper shunt 31. This is the resistance value of the current manganese copper shunt 31.

[0042] The calculations above show that changing the gain coefficient of the analog current channel increased the interference signal by 218.88. .

[0043] For further details, please refer to Figures 1 to 3 The metering chip 41 of this application also includes a calibration parameter register.

[0044] Specifically, step S2 includes the following sub-steps: S21: Under multiple preset different application conditions, the energy meter 1 is tested respectively to obtain multiple corresponding error changes of the energy meter 1; wherein, the application conditions include applied voltage and applied current.

[0045] Multiple different application conditions refer to multiple different voltage and current parameters, allowing the energy meter 1 to operate under different applied voltage and current conditions, thus obtaining different error changes in the energy meter 1.

[0046] For example, the first applied condition is 115% of the rated voltage and 5% of the rated current, at which time the error change of the measured energy meter 1 is 1.8%; the second applied condition is 110% of the rated voltage and 10% of the rated current, at which time the error change of the measured energy meter 1 is 1.5%; and so on.

[0047] S22: Convert each error change into a corresponding compensation parameter, and establish an error parameter compensation table based on multiple different compensation parameters.

[0048] Based on the different error changes of the energy meter 1 obtained in step S21 (such as 1.8%, 1.5%, etc.), these are converted to obtain multiple corresponding compensation parameters. Finally, an error parameter compensation table is established based on these compensation parameters for subsequent use.

[0049] S23: When the energy meter 1 is running, acquire the sampling voltage and sampling current of the energy meter 1, and determine whether the sampling voltage and sampling current are within the preset application conditions.

[0050] For example, if the current sampling voltage and sampling current of the current electricity meter 1 are 115% of the rated voltage and 5% of the rated current, it means that it is within the preset first application conditions.

[0051] S24: If present, query the error parameter compensation table, obtain the corresponding compensation parameters under the applied conditions, and write the compensation parameters back to the calibration parameter register to compensate for the error change of the current energy meter 1.

[0052] If the sampling voltage and sampling current are within the preset application conditions, the corresponding error change is looked up in the error parameter compensation table according to the application conditions corresponding to the sampling voltage and sampling current; based on the error change, the corresponding compensation parameter is obtained. Finally, the compensation parameter is written back to the calibration parameter register of the metering chip 41 to compensate for the error change of the current energy meter 1.

[0053] The voltage effect under specific voltage and current conditions can be reduced through the above compensation calibration.

[0054] In summary, the method of this application first addresses the issue from a hardware perspective: For the interference source, the structure and parameters of transformer 21 are adjusted to reduce its impact on other devices; the leakage magnetic field intensity radiated from the interference source (transformer 21) to the sensitive device (manganese copper shunt 31) is directly and effectively reduced from both physical layout and structural shielding dimensions, resulting in a significant fundamental solution. For the interfered device, the structure and parameters of manganese copper shunt 31 are adjusted to reduce the impact of the interference source, and the influence of interference signals is suppressed from the perspective of manganese copper shunt 31 itself. For the interfered device, the parameters of metering chip 41 are adjusted to enhance the interfered signal and reduce relative interference; by synergistically increasing the resistance of manganese copper shunt 31, reducing its affected area, and increasing the gain of the ADC front end, the signal-to-noise ratio of the current sampling channel is systematically enhanced. Especially for small current signals, the useful signal is amplified multiple times, while the interference path is suppressed, greatly enhancing the inherent immunity of metering module 4 to magnetic field interference. Next, from a software perspective: through program design, the actual error change of electricity meter 1 is compensated to achieve accurate correction and further suppress the influence of voltage.

[0055] Through the above collaborative design, this application can suppress the voltage influence from multiple aspects (such as interference source, propagation path, signal conditioning, etc.), and can stably control the change in voltage influence error of the energy meter 1 at the high voltage and low current test point from the original close to the standard limit (about 1.5%-1.8%) to within 1%. This not only meets but also far exceeds the requirements of international and national standards, but also meets the higher internal control indicators of enterprises for product performance, significantly improving the metering accuracy, reliability and market competitiveness of the product.

[0056] Based on the same inventive concept, such as Figure 2 As shown, the present invention also provides an energy meter 1, including a power supply module 2, a sampling module 3, a metering module 4, and a control module 5.

[0057] The power supply module 2 supplies power to the internal circuitry of the energy meter 1, and includes a transformer 21. The sampling module 3, connected to the power supply module 2, collects voltage and current signals from the energy meter 1 and includes a manganese-copper shunt 31. The metering module 4, connected to both the power supply module 2 and the sampling module 3, measures electrical energy and includes a metering chip 41. The control module 5, connected to both the power supply module 2 and the metering module 4, controls both modules.

[0058] In this application, the steps of the voltage influence error suppression method described above are performed when the electricity meter 1 is in the production and verification stage.

[0059] In this application, the other technical features of the above-mentioned electricity meter 1 are the same as those disclosed in the embodiments of the aforementioned voltage influence error suppression method, and will not be repeated here.

[0060] Based on the same inventive concept, this application also provides a readable storage medium storing a microcontroller program, which can be executed by a processor to implement the above-mentioned voltage influence error suppression method.

[0061] See Figure 8 If the integrated unit described above is implemented as a software functional unit and sold or used as an independent product, it can be stored in the readable storage medium 100.

[0062] The description of the execution process of program data in a readable storage medium can be found in the descriptions in the various method embodiments of this application above, and will not be repeated here.

[0063] Therefore, this invention discloses a method for suppressing voltage-induced errors, an electricity meter, and a storage medium. This method is applied to an electricity meter, which includes a power supply module, a sampling module, a metering module, and a control module. The sampling module, metering module, and control module are connected sequentially, and the power supply module is connected to each of these modules. The power supply module includes a transformer, the sampling module includes a manganese-copper shunt, and the metering module includes a metering chip. The method includes the steps of: adjusting the structure and parameters of the transformer, the manganese-copper shunt, and the metering chip; and compensating for and calibrating the change in error of the electricity meter through the control module. The method of this application, firstly, addresses the issue from a hardware perspective: by adjusting the structure and parameters of the transformer to reduce its impact on other devices, it directly and effectively reduces the leakage magnetic field intensity radiated from the interference source (transformer) to the sensitive device (manganese-copper shunt) from both physical layout and structural shielding dimensions, achieving a significant fundamental solution. For the affected devices, the structure and parameters of the manganese-copper shunt were adjusted to reduce the impact of interference sources. The influence of interference signals was also suppressed by addressing the manganese-copper shunt itself. For the affected devices, the parameters of the metering chip were adjusted to enhance the interference signal and reduce relative interference. By synergistically increasing the resistance of the manganese-copper shunt, reducing its affected area, and increasing the gain of the ADC front-end, the signal-to-noise ratio of the current sampling channel was systematically enhanced. Especially for small current signals, the useful signal was amplified multiple times, while the interference path was suppressed, greatly enhancing the inherent immunity of the metering module to magnetic field interference. Then, from a software perspective: through program design, compensation for the actual error change of the energy meter was achieved, realizing accurate correction and further suppressing voltage influence. Through the above collaborative design, this application can suppress the voltage influence from multiple aspects (such as interference sources, propagation paths, signal conditioning, etc.), and can stably control the change in voltage influence error at the high voltage and low current test point of the electricity meter from the original close to the standard limit (about 1.5%-1.8%) to within 1%. This not only meets but also far exceeds the requirements of international and national standards, but also meets the higher internal control indicators of enterprises for product performance, significantly improving the metering accuracy, reliability and market competitiveness of the product.

[0064] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for suppressing voltage-induced errors, applied to an electricity meter, characterized in that, The electricity meter includes a power supply module, a sampling module, a metering module, and a control module; the sampling module, metering module, and control module are connected in sequence, and the power supply module is connected to the sampling module, metering module, and control module respectively; the power supply module includes a transformer, the sampling module includes a manganese-copper shunt, and the metering module includes a metering chip; The voltage influence error suppression method includes the following steps: The structure and parameters of the transformer, the structure and parameters of the manganese-copper shunt, and the parameters of the metering chip are adjusted respectively. The control module compensates for and calibrates the error change of the electricity meter.

2. The voltage influence error suppression method according to claim 1, characterized in that, The adjustment of the transformer's structure and parameters includes: The direction of the transformer core is changed so that the direction of the main magnetic lines of force generated by the transformer is not perpendicular to the manganese-copper shunt.

3. The voltage influence error suppression method according to claim 1, characterized in that, The adjustment of the transformer's structure and parameters includes: A shielding winding layer is provided inside the transformer to shield the primary winding and the secondary winding.

4. The voltage influence error suppression method according to claim 1, characterized in that, The adjustment of the transformer's structure and parameters includes: Increase the number of turns in the primary winding of the transformer to 1.1 to 1.2 times the original number.

5. The voltage influence error suppression method according to claim 1, characterized in that, The adjustment of the structure and parameters of the manganese-copper shunt includes: Increase the resistance of the manganese copper shunt to 1.15 to 1.25 times its original value.

6. The voltage influence error suppression method according to claim 1, characterized in that, The adjustment of the structure and parameters of the manganese-copper shunt includes: The length, width, and height of the manganese-copper shunt are changed respectively, so that the area through which the magnetic field generated by the transformer passes perpendicularly through the manganese-copper shunt is reduced to 0.75 to 0.85 times the original area.

7. The voltage influence error suppression method according to claim 1, characterized in that, The metering chip includes an analog-to-digital converter, and adjusting the parameters of the metering chip includes: The analog current channel gain of the analog-to-digital converter is increased to 1.5 times the original value.

8. The voltage influence error suppression method according to claim 1, characterized in that, The metering chip includes a calibration parameter register, and the step of compensating for and calibrating the error change of the energy meter through the control module includes: The electricity meter is tested under multiple preset different application conditions to obtain multiple corresponding error changes of the electricity meter; wherein, the application conditions include applied voltage and applied current; Each of the error changes is converted into a corresponding compensation parameter, and an error parameter compensation table is established based on the multiple different compensation parameters. When the energy meter is running, the sampling voltage and sampling current of the energy meter are acquired, and it is determined whether the sampling voltage and sampling current are within the preset application conditions; If present, the error parameter compensation table is queried to obtain the corresponding compensation parameter under the applied condition, and the compensation parameter is written back to the calibration parameter register to compensate for the current error change of the energy meter.

9. An electricity meter, characterized in that, include: A power supply module is used to supply power to the internal circuitry of the energy meter, and the power supply module includes a transformer; A sampling module, connected to the power supply module, is used to collect the voltage and current signals of the energy meter. The sampling module includes a manganese copper shunt. A metering module is connected to the power supply module and the sampling module respectively, and is used to meter electrical energy. The metering module includes a metering chip. A control module is connected to the power module and the metering module respectively, and is used to control the power module and the metering module; When the energy meter is in the production and verification stage, the steps of the voltage influence error suppression method as described in any one of claims 1 to 8 are performed.

10. A readable storage medium having a microcontroller program stored thereon, characterized in that, When the microcontroller program is executed by the processor, it implements the steps of the method as described in any one of claims 1 to 8.

Images