Low-frequency current transformer circuit based on integrated circuit hardware module control and electric energy meter
The low-frequency current transformer circuit controlled by the integrated circuit hardware module converts the current signal into a voltage value using a transimpedance amplifier and an analog-to-digital converter. By resolving the error value through the integrated circuit, the problem of measurement deviation in low-frequency current transformers is solved, and high-precision current measurement is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGAN LEADING HUACAI ELECTRONIC TECH CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-08-04
AI Technical Summary
Existing low-frequency current transformer circuits suffer from measurement deviations due to leakage magnetic field effects, making it difficult to meet the high standards required for precision control and data acquisition.
The low-frequency current transformer circuit based on integrated circuit hardware module control includes a transimpedance amplifier, an analog-to-digital converter, and an integrated circuit hardware module. The transimpedance amplifier converts the current signal into a voltage value, the analog-to-digital converter digitizes the voltage value, and the integrated circuit hardware module analyzes and calculates the error value, finally outputting a high-precision current value.
It improves the accuracy and stability of current measurement, filters out interference from error factors, and provides high-quality current data to support power metering and system monitoring.
Smart Images
Figure CN224594722U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of current transformer technology, and in particular to a low-frequency current transformer circuit and energy meter based on integrated circuit hardware module control. Background Technology
[0002] In fields such as power system monitoring, industrial automation control, and smart grid construction, the high precision and reliability of current measurement are of irreplaceable importance.
[0003] Although existing low-frequency current transformer circuits can complete the acquisition and conversion of current signals, the measurement results are often biased due to the leakage magnetic effect of low-frequency current transformers, making it difficult to meet the high standards of precision control and data acquisition. Utility Model Content
[0004] This invention addresses the problem that while existing low-frequency current transformer circuits can acquire and convert current signals, their measurement results are often biased due to the leakage magnetic effect of low-frequency current transformers, making it difficult to meet the high standards of precision control and data acquisition. The invention provides a low-frequency current transformer circuit and an energy meter based on integrated circuit hardware module control.
[0005] The technical solution adopted in this utility model is:
[0006] A low-frequency current transformer circuit based on integrated circuit hardware module control includes:
[0007] Current transformer (CT), the primary winding of the current transformer (CT) is connected to the external circuit under test;
[0008] A transimpedance amplifier is connected to the secondary winding of a current transformer (CT) and is used to convert the current signal acquired by the CT into a voltage value; wherein, the magnitude of the current acquired by the CT is proportional to the magnitude of the voltage.
[0009] An analog-to-digital converter (ADC) is connected to a transimpedance amplifier; the ADC converts analog voltage values into digital values.
[0010] The integrated circuit hardware module is connected to the analog-to-digital converter (ADC). The integrated circuit hardware module parses the digital value of the voltage input from the ADC into a current value. This current value is then calculated with an error value to output a highly accurate final current value.
[0011] Furthermore, the integrated circuit hardware module includes:
[0012] The parsing submodule connects to the analog-to-digital converter (ADC), receives the voltage value from the ADC, parses the digital value of the voltage value into a current value, and outputs the current value, expressed as...
[0013] Current value = Voltage value / Resistance value of the feedback resistor in the transimpedance amplifier;
[0014] The compensation submodule stores the error values of multiple range points of the current transformer (CT); the range points are used as the true values.
[0015] The calculation submodule adds the current value collected by the current transformer (CT) to the error value of the corresponding range point, and outputs a final current value with high accuracy.
[0016] Furthermore, the error values at multiple range points are calculated using the measurement results of a current testing device with an error of less than 0.05% and the current values output by the analytical submodule.
[0017] Furthermore, the current testing equipment with an error of less than 0.05% is the HIT series Hall effect replacement current sensor from Hangzhi.
[0018] Furthermore, the integrated circuit hardware module is an FPGA.
[0019] Furthermore, the parsing submodule, compensation submodule, and arithmetic submodule are all circuits within the FPGA.
[0020] Furthermore, the integrated circuit hardware module is an ASIC.
[0021] Furthermore, the parsing submodule, compensation submodule, and arithmetic submodule are all circuits within the ASIC.
[0022] Based on the same inventive concept, this utility model also provides an electricity meter, which includes the aforementioned low-frequency current transformer circuit controlled by an integrated circuit hardware module.
[0023] The beneficial effects of this utility model are:
[0024] This invention discloses a low-frequency current transformer circuit and energy meter controlled by an integrated circuit hardware module. The circuit efficiently converts the current signal acquired by the current transformer (CT) into a voltage value through a transimpedance amplifier. After precise digitization by an analog-to-digital converter (ADC), the integrated circuit hardware module analyzes the current value and calculates it with the error value, ultimately outputting a highly accurate current value. This design improves the accuracy and stability of current measurement, effectively filters out interference from error factors, and makes the current detection results more reliable, providing high-quality current data for subsequent energy metering and system monitoring. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a circuit schematic of a low-frequency current transformer controlled by an integrated circuit hardware module. Detailed Implementation
[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0028] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.
[0029] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.
[0030] As attached Figure 1 As shown, the low-frequency current transformer circuit based on integrated circuit hardware module control disclosed in this embodiment includes a current transformer (CT), a transimpedance amplifier (1), an analog-to-digital converter (5), and an integrated circuit hardware module (2). Based on the complete structure of the low-frequency current transformer circuit based on integrated circuit hardware module control, this embodiment also provides an external circuit under test (3) and an external receiving device (4).
[0031] The primary winding of the current transformer (CT) is connected to the external circuit under test (3).
[0032] The transimpedance amplifier 1 is connected to the secondary winding of the current transformer CT and is used to convert the current signal collected by the current transformer CT into a voltage value; wherein, the magnitude of the current collected by the current transformer CT is proportional to the magnitude of the voltage; the transimpedance amplifier 1 is the transimpedance amplifier 1 in the prior art.
[0033] Analog-to-digital converter 5 is connected to transimpedance amplifier 1; analog-to-digital converter 5 converts the analog voltage value into a digital value.
[0034] Integrated circuit hardware module 2 is connected to analog-to-digital converter 5; integrated circuit hardware module 2 parses the digital value of the voltage value input from analog-to-digital converter 5 into a current value, calculates the current value and the error value, and outputs a highly accurate final current value for use by external receiving device 4.
[0035] The beneficial effects of the above technical solution are as follows: the current signal acquired by the current transformer (CT) is efficiently converted into a voltage value by the transimpedance amplifier 1, and then accurately digitized by the analog-to-digital converter 5. The integrated circuit hardware module 2 then analyzes the current value and calculates it with the error value, finally outputting a highly accurate current value. This design improves the accuracy and stability of current measurement, effectively filters out interference from error factors, makes the current detection results more reliable, and provides high-quality current data for subsequent power metering, system monitoring, etc.
[0036] Furthermore, the integrated circuit hardware module 2 includes a parsing submodule 21, a compensation submodule 22, and a calculation submodule 23.
[0037] The parsing submodule 21 is connected to the analog-to-digital converter 5, receives the voltage value input from the converter, parses the digital value of the voltage value into a current value, and outputs the current value, expressed as...
[0038] Current value = Voltage value / Resistance value of the feedback resistor in transimpedance amplifier 1;
[0039] Compensation submodule 22 stores the error values of multiple range points of the current transformer CT; the range points are used as the true values.
[0040] The calculation submodule 23 superimposes the current value collected by the current transformer CT with the error value of the corresponding range point to output a final current value with high accuracy.
[0041] The error values at multiple measurement ranges are calculated using the measurement results of a current testing device with an error of less than 0.05% and the current values output by the analysis submodule 21.
[0042] The specific method is as follows:
[0043] Current values at multiple range points are collected using a current transformer (CT). All range points are determined by a current testing device with an error of less than 0.05%. The current testing device with an error of less than 0.05% uses the HIT series Hall effect replacement current sensor from Hangzhi.
[0044] Calculate the difference between the current value at each current transformer CT acquisition range point and the corresponding range point;
[0045] The current values and differences collected by each current transformer (CT) at multiple range points are added together, and the sum is the final current value with high accuracy.
[0046] When the measured value is not at the preset range point, first find its two adjacent range points and corresponding error values, calculate the error compensation value of the measured value through linear interpolation, and then superimpose this compensation value with the measured current value to obtain a high-precision final current value. This process is completed by the operation submodule 23 in the integrated circuit hardware module 2.
[0047] Furthermore, integrated circuit hardware module 2 is an FPGA. The parsing submodule 21, compensation submodule 22, and arithmetic submodule 23 are all circuits inside the FPGA, i.e., modules developed for the FPGA.
[0048] Furthermore, integrated circuit hardware module 2 is an FPGA. The parsing submodule 21, compensation submodule 22, and arithmetic submodule 23 are all circuits within the ASIC, i.e., modules developed by the ASIC.
[0049] Based on the same inventive concept, this embodiment also provides an electricity meter, which includes the aforementioned low-frequency current transformer circuit controlled by an integrated circuit hardware module.
[0050] The beneficial effects of the above technical solution are as follows: First, the voltage value is accurately converted into a current value by the analysis submodule 21, and combined with the multi-range point error values stored by the compensation submodule 22, and processed by the calculation submodule 23, the error of the current transformer under different ranges is effectively compensated, and a high-precision current value is output to meet the high-precision measurement requirements. Second, the linear interpolation method is used to compensate for the error of the non-range point measurement value, which broadens the measurement range while ensuring measurement accuracy. Third, the integrated circuit hardware module 2 uses FPGA or ASIC to integrate analysis, compensation and calculation functions, simplifying the circuit structure, improving the system integration and reliability, facilitating large-scale application and promotion, and improving the accuracy, adaptability and stability of low-frequency current measurement as a whole.
Claims
1. A low-frequency current transformer circuit based on integrated circuit hardware module control, characterized in that, include: Current transformer (CT), the primary winding of the current transformer (CT) is connected to the external circuit under test; A transimpedance amplifier is connected to the secondary winding of a current transformer (CT) and is used to convert the current signal acquired by the CT into a voltage value; wherein, the magnitude of the current acquired by the CT is proportional to the magnitude of the voltage. An analog-to-digital converter (ADC) is connected to a transimpedance amplifier; the ADC converts analog voltage values into digital values. The integrated circuit hardware module is connected to the analog-to-digital converter (ADC). The integrated circuit hardware module parses the digital value of the voltage input from the ADC into a current value. This current value is then calculated with an error value to output a highly accurate final current value.
2. The low-frequency current transformer circuit based on integrated circuit hardware module control according to claim 1, characterized in that, The integrated circuit hardware module includes: The parsing submodule connects to the analog-to-digital converter (ADC), receives the voltage value from the ADC, parses the digital value of the voltage value into a current value, and outputs the current value, expressed as... Current value = Voltage value / Resistance value of the feedback resistor in the transimpedance amplifier; The compensation submodule stores the error values of multiple range points of the current transformer (CT); the range points are used as the true values. The calculation submodule adds the current value collected by the current transformer (CT) to the error value of the corresponding range point, and outputs a final current value with high accuracy.
3. The low-frequency current transformer circuit based on integrated circuit hardware module control according to claim 2, characterized in that, The error values at multiple measurement points are calculated using the measurement results of a current testing device with an error of less than 0.05% and the current values output by the analytical submodule.
4. The low-frequency current transformer circuit based on integrated circuit hardware module control according to claim 3, characterized in that, The current testing equipment with an error of less than 0.05% is the HIT series Hall replacement current sensor from Hangzhi.
5. The low-frequency current transformer circuit based on integrated circuit hardware module control according to any one of claims 1-4, characterized in that, The integrated circuit hardware module is an FPGA.
6. The low-frequency current transformer circuit based on integrated circuit hardware module control according to claim 5, characterized in that, The parsing submodule, compensation submodule, and arithmetic submodule are all internal circuits of the FPGA.
7. The low-frequency current transformer circuit based on integrated circuit hardware module control according to any one of claims 1-4, characterized in that, The integrated circuit hardware module is an ASIC.
8. The low-frequency current transformer circuit based on integrated circuit hardware module control according to claim 7, characterized in that, The parsing submodule, compensation submodule, and arithmetic submodule are all internal circuits of the ASIC.
9. An electricity meter, characterized in that, Includes the low-frequency current transformer circuit based on integrated circuit hardware module control as described in any one of claims 1-6.