A series-parallel combined shifting method, device and storage medium for electric energy metering

Abstract

The application discloses a series-parallel combined gear shifting method and device for electric energy metering and a storage medium. Two sets of current sensors are adopted, one of which is a first current sensor with a larger range and serves as a main sensor responsible for current measurement on a bus of an equipment under test in the whole metering process. The other set is composed of second, third and fourth current sensors with different measurement accuracies and is used for accurate measurement in a low current range. The combined structure ensures that accurate measurement data can be provided in a wide current range. Through the combination of a gear shifting module, a multi-channel digital-analog conversion module and a digital signal processing module, automatic gear shifting and real-time adjustment of the measurement gear can be realized, a wide current and voltage range from micro-ampere to hundreds of amperes and from several volts to dozens of volts is covered, different battery models and working states are adapted, manual intervention is not needed, and accurate electric energy cumulative measurement results can be continuously provided under different working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric energy metering, and more particularly, to a series-parallel combined shifting method, device and storage medium for electric energy metering. BACKGROUND

[0002] Currently, for the high-precision electric energy metering detection technology required for lithium ion battery charging and discharging electric energy metering, the "virtual load" verification or "real load" verification method with fixed verification points is usually adopted. The two traditional electric energy accumulation methods usually adopt virtual load or real load scheme with fixed verification points, and their common point is that the verification point is fixed, that is, there is no shifting operation on the primary loop in the metering process, which ensures the continuity of electric energy accumulation.

[0003] However, when the object to be detected is a lithium ion battery, the voltage and current change all the time during the charging and discharging process of the battery according to the current characteristics of the battery and the working mode of the battery management system. Therefore, the traditional real load high-precision electric energy accumulation metering detection scheme will no longer be applicable for calibration and verification. SUMMARY

[0004] In order to solve the problems of the prior art, the present application provides a series-parallel combined shifting method, device and storage medium for electric energy metering.

[0005] According to one aspect of the present application, a series-parallel combined shifting method for electric energy metering is provided, comprising:

[0006] The voltage signal of the detected device is collected by the voltage front-end module, the primary current signal of the detected device is collected by the first current sensor, and the collected voltage signal and primary current signal are transmitted to the multi-channel digital-to-analog conversion module. The voltage signal and primary current signal are transmitted to the digital signal processing module by the channel digital-to-analog conversion module;

[0007] The digital signal processing module determines the target current interval corresponding to the primary current signal from the plurality of preset current intervals, generates the corresponding first shifting instruction according to the target current interval, and sends the first shifting instruction to the shifting module;

[0008] The shifting module determines one of the second current sensor, the third current sensor and the fourth current sensor as the target current sensor based on the received first shifting instruction, and controls the first switch to be closed, so that the first current sensor is only turned on with the target current sensor; wherein the second current sensor, the third current sensor and the fourth current sensor are connected in parallel after the first current sensor, and the measurement accuracy of each current sensor is different, and the range of the first current sensor is the largest;

[0009] The secondary current signal of the device under test is collected by the target current sensor, and the collected secondary current signal is transmitted to the multi-channel digital-to-analog conversion module, and the secondary current signal is transmitted to the digital signal processing module by the channel digital-to-analog conversion module.

[0010] The digital signal processing module calculates the power and energy of the device under test based on the received voltage signal and secondary current signal.

[0011] Optionally, the method further comprises:

[0012] The multi-channel digital-to-analog conversion module calculates the difference between the primary current signal and the secondary current signal;

[0013] The multi-channel digital-to-analog conversion module calibrates the primary current signal collected by the first current sensor according to the difference, and transmits the calibrated primary current signal to the digital signal processing module;

[0014] The digital signal processing module calculates the energy value generated by the device under test during gear shifting according to the received voltage signal and the calibrated primary current signal.

[0015] Optionally, the method further comprises:

[0016] The digital signal processing module determines whether the primary current signal is greater than a preset current threshold;

[0017] When the primary current signal is greater than the preset current threshold, the digital signal processing module generates a corresponding second gear shifting instruction and sends the second gear shifting instruction to the gear shifting module;

[0018] The gear shifting module controls the second switch to be closed and the first switch to be opened based on the received second gear shifting instruction; wherein, when the second switch is closed, the first current sensor and the corresponding diode on the rectifier bridge are turned on.

[0019] Optionally, the first current sensor is a magnetic flux gate current sensor with a range of 600A.

[0020] Optionally, the collected voltage signal and primary current signal are transmitted to the multi-channel digital-to-analog conversion module, comprising:

[0021] The collected voltage signal is transmitted to the voltage front-end module, and the voltage signal is in-phase amplified or attenuated by the voltage front-end module, and the in-phase amplified or attenuated voltage signal is transmitted to the multi-channel digital-to-analog conversion module;

[0022] The collected primary current signal is transmitted to the first current front-end module, and the first current front-end module converts the primary current signal into a first target voltage signal suitable for sampling by the multi-channel digital-to-analog conversion module, and transmits the first target voltage signal to the multi-channel digital-to-analog conversion module.

[0023] Optionally, transmitting the acquired secondary current signal to the multi-channel digital-to-analog converter module includes:

[0024] The acquired secondary current signal is transmitted to the second current front-end module, which converts the secondary current signal into a second target voltage signal suitable for sampling by the multi-channel digital-to-analog converter module, and then transmits the second target voltage signal to the multi-channel digital-to-analog converter module.

[0025] Optionally, the digital signal processing module calculates the power and energy of the device under test based on the received voltage signal and secondary current signal, including:

[0026] The digital signal processing module determines a target electrical energy mathematical model from a set of preset electrical energy mathematical models.

[0027] The digital signal processing module calculates the power and energy of the tested equipment based on the received voltage and secondary current signals and using the target electrical energy mathematical model.

[0028] According to another aspect of the present invention, a series-parallel combined shifting device for electricity metering is provided, comprising:

[0029] The system includes a voltage front-end module, a first current sensor, a second current sensor, a third current sensor, a fourth current sensor, a shift module, a channel digital-to-analog converter module, and a digital signal processing module. The second, third, and fourth current sensors are connected in parallel and then connected in series after the first current sensor. Each current sensor has a different measurement accuracy, with the first current sensor having the largest measurement range.

[0030] The voltage front-end module is used to acquire the voltage signal of the device under test and transmit the acquired voltage signal to the multi-channel digital-to-analog converter module. The multi-channel digital-to-analog converter module then transmits the primary current signal to the digital signal processing module.

[0031] The first current sensor is used to collect the primary current signal of the device under test and transmit the collected primary current signal to the multi-channel digital-to-analog converter module, which then transmits the primary current signal to the digital signal processing module.

[0032] The second, third, and fourth current sensors are all used to acquire the secondary current signal of the device under test and transmit the acquired secondary current signal to the multi-channel digital-to-analog converter module, which then transmits the secondary current signal to the digital signal processing module.

[0033] The digital signal processing module is used to determine the target current range corresponding to the primary current signal from multiple preset current ranges, generate the corresponding first shift command according to the target current range, and send the first shift command to the shift module.

[0034] The shift module is used to determine one of the current sensors from the second current sensor, the third current sensor and the fourth current sensor as the target current sensor based on the received first shift command, and control the first switch to close so that the first current sensor is only connected to the target current sensor.

[0035] The digital signal processing module is also used to calculate the power and energy of the device under test based on the received voltage signal and secondary current signal.

[0036] Optionally, the multi-channel digital-to-analog converter module is also used to calculate the difference between the primary current signal and the secondary current signal, calibrate the primary current signal collected by the first current sensor according to the difference, and transmit the calibrated primary current signal to the digital signal processing module.

[0037] The digital signal processing module is also used to calculate the electrical energy generated by the tested equipment during gear switching based on the received voltage signal and the calibrated primary current signal.

[0038] Optionally, the digital signal processing module is further configured to determine whether the primary current signal is greater than a preset current threshold; when the primary current signal is greater than the preset current threshold, the digital signal processing module generates a corresponding second shift command and sends the second shift command to the shift module.

[0039] The shift module is also used to control the second switch to close and the first switch to open based on the received second shift command; wherein, when the second switch is closed, the first current sensor is turned on by the corresponding diode on the rectifier bridge.

[0040] Optionally, the first current sensor is a fluxgate current sensor with a range of 600A.

[0041] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the methods described in any of the above aspects of the present invention.

[0042] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the preceding aspects of the present invention.

[0043] This invention employs a dual-sensor structure. One set, a primary current sensor with a larger measurement range, serves as the main sensor responsible for measuring the current on the busbar of the device under test throughout the metering process. The other set consists of second, third, and fourth current sensors with varying measurement accuracies, used for precise measurements in low-current ranges. This combined structure ensures accurate measurement data across a wide current range, from microamperes to hundreds of amperes. Through a combination of a gear-switching module, a multi-channel analog-to-digital converter, and a digital signal processing module, automatic gear switching and real-time adjustment of the measurement range are achieved, covering a wide current and voltage range from microamperes to hundreds of amperes and from a few volts to tens of volts. This adapts to different battery models and operating conditions without manual intervention, ensuring consistently accurate cumulative energy measurement results under various operating conditions. Attached Figure Description

[0044] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0045] Figure 1 This is a schematic flowchart of a series-parallel combination switching method for electricity metering in one embodiment of the present invention.

[0046] Figure 2 This is a schematic diagram of a series-parallel combined shifting device for electricity metering according to an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0048] The embodiments of the present invention will now be described in detail. When the description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0049] It should be understood that in the description of all embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0050] Figure 1 A schematic flowchart of the series-parallel combination switching method for electricity metering provided by the present invention is shown.Figure 1 As shown, the series-parallel combination switching method for electricity metering includes:

[0051] Step S1: Acquire the voltage signal of the device under test through the voltage front-end module, acquire the primary current signal of the device under test through the first current sensor, and transmit the acquired voltage signal and primary current signal to the multi-channel digital-to-analog converter module. The multi-channel digital-to-analog converter module then transmits the voltage signal and primary current signal to the digital signal processing module.

[0052] Optionally, the first current sensor is a fluxgate current sensor with a range of 600A.

[0053] Optionally, transmitting the acquired voltage signal and primary current signal to the multi-channel digital-to-analog converter module includes: transmitting the acquired voltage signal to a voltage front-end module, where the voltage front-end module amplifies or attenuates the voltage signal in phase, and then transmitting the amplified or attenuated voltage signal to the multi-channel digital-to-analog converter module; transmitting the acquired primary current signal to a first current front-end module, where the first current front-end module converts the primary current signal into a first target voltage signal suitable for sampling by the multi-channel digital-to-analog converter module, and then transmitting the first target voltage signal to the multi-channel digital-to-analog converter module.

[0054] In this embodiment of the invention, the voltage signal of the device under test is acquired by a voltage sensor and sent to a voltage front-end module for voltage signal acquisition. When performing voltage-to-voltage (V / V) conversion, the voltage front-end module only needs to amplify or attenuate the external voltage signal in phase. Therefore, this invention employs instrumentation amplification for inverting amplification and operational amplifiers for directional amplification.

[0055] A 600A fluxgate wide-range current sensor is used as the main sensor for measurement, and the current signal is acquired through this 600A wide-range current sensor. This sensor requires high stability and linearity, but its zero-point performance is not critical, as it can be calibrated in real time by subsequent multi-range sensors. The measurement current range is switched according to a preset logic based on the 600A fluxgate current transformer. When the input current is between 100 and 600A, the AD converter uses the sampling value from the 600A channel combined with the voltage sampling value to calculate the accumulated energy value.

[0056] Step S2: The digital signal processing module determines the target current range corresponding to the primary current signal from multiple preset current ranges, generates the corresponding first shift command based on the target current range, and sends the first shift command to the shift module.

[0057] In this embodiment of the invention, the preset multiple current ranges are, for example but not limited to: 600A~100A, 100A~20A, 20A~5A, and 5A~0A. When the input current is in the 600A~100A range, a first current sensor is used to collect the current signal; when the input current is in the 100A~20A range, a second current sensor is used to collect the current signal; when the input current is in the 20A~5A range, a third current sensor is used to collect the current signal; and when the input current is in the 5A~0A range, a fourth current sensor is used to collect the current signal.

[0058] Step S3: Based on the received first shift command, the shift module determines one of the current sensors from the second, third, and fourth current sensors as the target current sensor, and controls the first switch to close, so that the first current sensor is only connected to the target current sensor; wherein, the second, third, and fourth current sensors are connected in parallel and then connected in series after the first current sensor, and the measurement accuracy of each current sensor is different, with the first current sensor having the largest range;

[0059] In this embodiment of the invention, three sets of 100A, 20A, and 5A high-precision current sensors are connected in parallel and then in series after a 600A wide-range current sensor to acquire multiple current signals, covering the accurate measurement requirements of various current ranges and ensuring continuous current conversion on the bus from the start to the end of measurement. These sensors require sufficiently low zero-point drift and high linearity, while the wide-range performance requirement is not high. The three sets of 100A, 20A, and 5A high-precision current sensors are switched via a first switch S1, and the 600A wide-range current sensor is connected to the output via a second switch S2. When the input current is less than 100A, the second switch S2 is closed first to ensure that the circuit remains conductive during the switching process.

[0060] Step S4: Acquire the secondary current signal of the device under test through the target current sensor, and transmit the acquired secondary current signal to the multi-channel digital-to-analog converter module, which then transmits the secondary current signal to the digital signal processing module.

[0061] Optionally, transmitting the acquired secondary current signal to the multi-channel digital-to-analog converter module includes: transmitting the acquired secondary current signal to a second current front-end module, whereby the second current front-end module converts the secondary current signal into a second target voltage signal suitable for sampling by the multi-channel digital-to-analog converter module, and transmitting the second target voltage signal to the multi-channel digital-to-analog converter module.

[0062] In this embodiment of the invention, the second current front-end module receives a secondary current signal from the preceding current sensor, which is a small current signal. This module converts the input current into a voltage that can be sampled and measured by an analog-to-digital converter (A / D converter) using a precision platinum resistance thermometer. The current is then measured by measuring the voltage. During the current-to-voltage (I / V) conversion, a precision resistor is first connected in series with the externally input current signal. Simultaneously, an amplifier is used to convert the voltage signal across the resistor, ultimately obtaining a voltage value suitable for A / D sampling.

[0063] Step S5: The digital signal processing module calculates the power and energy of the device under test based on the received voltage signal and secondary current signal.

[0064] Optionally, the method further includes: a multi-channel digital-to-analog converter module calculating the difference between the primary current signal and the secondary current signal; the multi-channel digital-to-analog converter module calibrating the primary current signal acquired by the first current sensor based on the difference, and transmitting the calibrated primary current signal to the digital signal processing module; and the digital signal processing module calculating the electrical energy generated by the tested device during gear switching based on the received voltage signal and the calibrated primary current signal.

[0065] In this embodiment of the invention, after switching, the AD value of the 600A channel is calibrated according to the AD value of the switched gear. Then, the 600A channel is compensated for the energy value lost during the gear switching process according to the calibrated current and voltage values, achieving seamless compensation for the energy lost during gear switching, and the accuracy is fully calibrated to the accuracy of the low current range transformer.

[0066] Optionally, the method further includes: a digital signal processing module determining whether a primary current signal is greater than a preset current threshold; when the primary current signal is greater than the preset current threshold, the digital signal processing module generating a corresponding second shift command and sending the second shift command to the shift module; the shift module controlling the second switch to close and the first switch to open based on the received second shift command; wherein, when the second switch is closed, the first current sensor and the corresponding diode on the rectifier bridge are turned on.

[0067] In this embodiment of the invention, a high-current high-speed analog switch is used for overcurrent protection at the current port. When the primary current signal exceeds a preset current threshold (e.g., but not limited to 5000A), the high-current high-speed analog switch provides overcurrent protection at the current port. This high-current high-speed analog switch consists of a rectifier bridge and an operational amplifier. Through the follower function of the operational amplifier, the voltage across the corresponding diode is ensured to be approximately equal, i.e., the voltage across the diode is approximately zero. This results in very low leakage current in the rectifier bridge, ensuring the accuracy of the current across the sampling resistor. This circuit bypasses the current through the diodes. When an input overcurrent occurs, the voltage across the sampling resistor increases, and the corresponding diode in the rectifier bridge conducts. Since the forward voltage drop of the diode does not change significantly with the current, once the voltage across the sampling resistor reaches a certain value, the remaining current will be diverted through the diodes, thus preventing a large current from flowing through the sampling resistor. This provides limiting and protection, functioning as a high-speed switch.

[0068] Optionally, the digital signal processing module calculates the power and energy of the device under test based on the received voltage signal and secondary current signal, including: the digital signal processing module determines a target electrical energy mathematical model from a plurality of preset electrical energy mathematical models; the digital signal processing module calculates the power and energy of the device under test based on the received voltage signal and secondary current signal and using the target electrical energy mathematical model.

[0069] In this embodiment of the invention, the multi-channel digital-to-analog conversion adopts an innovative AD acquisition scheme, which uses two AD converters with different high and low frequencies to simultaneously acquire the input analog quantities from the current front-end module and the voltage front-end module. The acquired digital quantities are sent to the digital signal processing module, and a suitable power mathematical model is selected for processing to calculate power and power, thereby achieving high-precision power metering in different current ranges.

[0070] The current sensing module involved in this invention employs a dual-sensor structure. One set is a wide-range current sensor (600A level), which serves as the primary sensor responsible for current measurement on the busbar throughout the metering process. This sensor is designed for high stability and excellent linearity, ensuring continuous stability from the start to the end of metering. The other set consists of 100A, 20A, and 5A high-precision current sensors for accurate measurement in low current ranges. This combined structure ensures that the system can provide accurate measurement data across a wide current range, from microamperes to hundreds of amperes.

[0071] This invention introduces a high-current, high-speed analog switch. Its design is not only about its physical structure, but more importantly, its control logic and response speed. This module can close instantaneously to rapidly respond to sudden surges in current within the circuit. This high-speed response ensures that the system handles sudden surges in current quickly and accurately, while avoiding the tens of milliseconds of open-circuit states that can be introduced by traditional switching methods. This effectively reduces the impact on the entire system, thereby extending the lifespan of electrical equipment.

[0072] The intelligent voltage shifting method of this invention is a combination of intelligent algorithms and logic, realizing automatic voltage shifting. It uses a complex voltage detection algorithm to monitor changes in the input voltage in real time and automatically selects the appropriate shifting level based on preset logical conditions. The ingenuity of this algorithm lies in its ability to automatically adapt to various input voltage conditions without affecting measurement accuracy, ensuring precise measurements.

[0073] This invention utilizes a dual-AD self-calibration technique to achieve real-time calibration and high-resolution current and voltage sampling across different measurement ranges. In this technique, multiple AD converters sample the input analog signal at different frequencies, which is then processed using a carefully designed mathematical model. This method ensures both high-precision DC signal acquisition and effective detection of AC signals over a wide frequency range, guaranteeing the accuracy and stability of cumulative energy measurement.

[0074] The energy compensation algorithm of this invention is the core of ensuring seamless compensation for lost energy during gear switching. When the system switches gears, the energy compensation algorithm calculates the energy loss caused by the gear switching based on the current and voltage values, and seamlessly compensates for this lost energy value through corresponding calibration logic. The design of this algorithm requires highly accurate current and voltage measurements, as well as intelligent algorithm logic, to ensure the continuity and stability of the measurement results during gear switching.

[0075] The key to this invention lies in the efficient and stable data interaction between the various modules. Each module needs to achieve accurate data transmission under high-speed operation to ensure the overall performance of the system. Furthermore, the implementation logic of adaptive intelligent operation is also crucial; the system needs to be able to automatically select the appropriate measurement level under different operating conditions and perform real-time calibration to provide continuously accurate cumulative energy measurement results.

[0076] In summary, the present invention has the following advantages:

[0077] (1) Dynamic adaptability and wide range coverage: It can adjust the measurement range in real time to cover a wide range of current and voltage from microamperes to hundreds of amperes and from a few volts to tens of volts, adapting to different battery models and working conditions.

[0078] (2) Real-time calibration and high-resolution sampling: Real-time calibration is achieved through interval dual AD self-calibration technology, providing high-resolution voltage and current sampling to ensure high-precision power accumulation measurement.

[0079] (3) Fast response and stable reliability: The system has fast response characteristics, captures changes in battery parameters in real time, and maintains the stability and reliability of measurement results through intelligent calibration.

[0080] (4) Adaptive intelligent operation: It realizes automatic gear switching and intelligent calibration without manual intervention, ensuring that accurate power accumulation measurement results are continuously provided under different working conditions.

[0081] Exemplary apparatus

[0082] Figure 2 This is a schematic diagram of a series-parallel combined shifting device for electricity metering provided in an exemplary embodiment of the present invention. Figure 2 As shown, the series-parallel combined switching device for electricity metering includes:

[0083] The system includes a voltage front-end module, a first current sensor, a second current sensor, a third current sensor, a fourth current sensor, a shift module, a channel digital-to-analog converter module, and a digital signal processing module. The second, third, and fourth current sensors are connected in parallel and then connected in series after the first current sensor. Each current sensor has a different measurement accuracy, with the first current sensor having the largest measurement range.

[0084] The voltage front-end module is used to acquire the voltage signal of the device under test and transmit the acquired voltage signal to the multi-channel digital-to-analog converter module. The multi-channel digital-to-analog converter module then transmits the primary current signal to the digital signal processing module.

[0085] The first current sensor is used to collect the primary current signal of the device under test and transmit the collected primary current signal to the multi-channel digital-to-analog converter module, which then transmits the primary current signal to the digital signal processing module.

[0086] The second, third, and fourth current sensors are all used to acquire the secondary current signal of the device under test and transmit the acquired secondary current signal to the multi-channel digital-to-analog converter module, which then transmits the secondary current signal to the digital signal processing module.

[0087] The digital signal processing module is used to determine the target current range corresponding to the primary current signal from multiple preset current ranges, generate the corresponding first shift command according to the target current range, and send the first shift command to the shift module.

[0088] The shift module is used to determine one of the current sensors from the second current sensor, the third current sensor and the fourth current sensor as the target current sensor based on the received first shift command, and control the first switch to close so that the first current sensor is only connected to the target current sensor.

[0089] The digital signal processing module is also used to calculate the power and energy of the device under test based on the received voltage signal and secondary current signal.

[0090] Optionally, the multi-channel digital-to-analog converter module is also used to calculate the difference between the primary current signal and the secondary current signal, calibrate the primary current signal collected by the first current sensor according to the difference, and transmit the calibrated primary current signal to the digital signal processing module.

[0091] The digital signal processing module is also used to calculate the electrical energy generated by the tested equipment during gear switching based on the received voltage signal and the calibrated primary current signal.

[0092] Optionally, the digital signal processing module is further configured to determine whether the primary current signal is greater than a preset current threshold; when the primary current signal is greater than the preset current threshold, the digital signal processing module generates a corresponding second shift command and sends the second shift command to the shift module.

[0093] The shift module is also used to control the second switch to close and the first switch to open based on the received second shift command; wherein, when the second switch is closed, the first current sensor is turned on by the corresponding diode on the rectifier bridge.

[0094] Optionally, transmitting the acquired voltage signal and primary current signal to the multi-channel digital-to-analog converter module includes:

[0095] The acquired voltage signal is transmitted to the voltage front-end module, which amplifies or attenuates the voltage signal in phase, and then transmits the amplified or attenuated voltage signal to the multi-channel digital-to-analog converter module.

[0096] The acquired primary current signal is transmitted to the first current front-end module, which converts the primary current signal into a first target voltage signal suitable for sampling by the multi-channel digital-to-analog converter module, and then transmits the first target voltage signal to the multi-channel digital-to-analog converter module.

[0097] Optionally, transmitting the acquired secondary current signal to the multi-channel digital-to-analog converter module includes:

[0098] The acquired secondary current signal is transmitted to the second current front-end module, which converts the secondary current signal into a second target voltage signal suitable for sampling by the multi-channel digital-to-analog converter module, and then transmits the second target voltage signal to the multi-channel digital-to-analog converter module.

[0099] Optionally, the digital signal processing module calculates the power and energy of the device under test based on the received voltage signal and secondary current signal, including:

[0100] The digital signal processing module determines a target electrical energy mathematical model from a set of preset electrical energy mathematical models.

[0101] The digital signal processing module calculates the power and energy of the tested equipment based on the received voltage and secondary current signals and using the target electrical energy mathematical model.

[0102] The series-parallel combined shifting device for electricity metering in one embodiment of the present invention corresponds to the series-parallel combined shifting method for electricity metering in another embodiment of the present invention, and will not be described again here.

[0103] Exemplary electronic device

[0104] Figure 3 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. For example... Figure 3 As shown, the electronic device 30 includes one or more processors 31 and memory 32.

[0105] The processor 31 may be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0106] The memory 32 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 31 may execute the program instructions to implement the methods for information mining of historical change records and / or other desired functions of the software programs of the various embodiments of the present invention described above. In one example, the electronic device may also include an input device 33 and an output device 34, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0107] In addition, the input device 33 may also include, for example, a keyboard, a mouse, etc.

[0108] The output device 34 can output various information to the outside. The output device 34 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0109] Of course, for the sake of simplicity, Figure 3 Only some of the components of the electronic device relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0110] Exemplary computer program product and computer readable storage medium

[0111] In addition to the methods and apparatus described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps in the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0112] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0113] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the methods for information mining of historical change records according to various embodiments of the present invention as described in the "Exemplary Methods" section above.

[0114] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0115] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0116] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0117] The block diagrams of devices, systems, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0118] The methods and systems of the present invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the present invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers recording media storing programs for performing the methods according to the present invention.

[0119] It should also be noted that in the systems, apparatus, and methods of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0120] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A series-parallel combination switching method for electricity metering, characterized in that, include: The voltage signal of the device under test is acquired by the voltage front-end module, and the primary current signal of the device under test is acquired by the first current sensor. The acquired voltage signal and primary current signal are then transmitted to the multi-channel digital-to-analog converter module, which in turn transmits them to the digital signal processing module. The digital signal processing module determines the target current range corresponding to the primary current signal from multiple preset current ranges, generates the corresponding first shift command based on the target current range, and sends the first shift command to the shift module. Based on the received first shift command, the shift module determines one of the current sensors from the second, third, and fourth current sensors as the target current sensor, and controls the first switch to close so that the first current sensor is only connected to the target current sensor. The second, third, and fourth current sensors are connected in parallel and then connected in series after the first current sensor. The measurement accuracy of each current sensor is different, and the first current sensor has the largest range. The secondary current signal of the device under test is acquired by the target current sensor and transmitted to the multi-channel digital-to-analog converter module. The multi-channel digital-to-analog converter module then transmits the secondary current signal to the digital signal processing module. The multi-channel digital-to-analog converter module calculates the difference between the primary current signal and the secondary current signal; The multi-channel digital-to-analog converter module calibrates the primary current signal acquired by the first current sensor based on the difference, and transmits the calibrated primary current signal to the digital signal processing module. The digital signal processing module calculates the electrical energy generated by the tested equipment during gear switching based on the received voltage signal and the calibrated primary current signal. The digital signal processing module calculates the power and energy of the device under test based on the received voltage and secondary current signals.

2. The method according to claim 1, characterized in that, Also includes: The digital signal processing module determines whether the primary current signal is greater than a preset current threshold. When the primary current signal exceeds the preset current threshold, the digital signal processing module generates a corresponding second shift command and sends the second shift command to the shift module. Based on the received second shift command, the shift module controls the second switch to close and the first switch to open; wherein, when the second switch is closed, the first current sensor and the corresponding diode on the rectifier bridge are turned on.

3. The method according to claim 1, characterized in that, The first current sensor is a fluxgate current sensor with a range of 600A.

4. The method according to claim 1, characterized in that, The process of transmitting the acquired voltage signal and primary current signal to the multi-channel digital-to-analog converter module includes: The acquired voltage signal is transmitted to the voltage front-end module, which amplifies or attenuates the voltage signal in phase, and then transmits the amplified or attenuated voltage signal to the multi-channel digital-to-analog converter module. The acquired primary current signal is transmitted to the first current front-end module, which converts the primary current signal into a first target voltage signal suitable for sampling by the multi-channel digital-to-analog converter module, and then transmits the first target voltage signal to the multi-channel digital-to-analog converter module.

5. The method according to claim 1, characterized in that, The process of transmitting the acquired secondary current signal to the multi-channel digital-to-analog converter module includes: The acquired secondary current signal is transmitted to the second current front-end module, which converts the secondary current signal into a second target voltage signal suitable for sampling by the multi-channel digital-to-analog converter module, and then transmits the second target voltage signal to the multi-channel digital-to-analog converter module.

6. The method according to claim 1, characterized in that, The digital signal processing module calculates the power and energy of the device under test based on the received voltage signal and secondary current signal, including: The digital signal processing module determines a target electrical energy mathematical model from a set of preset electrical energy mathematical models. The digital signal processing module calculates the power and energy of the tested equipment based on the received voltage and secondary current signals and using the target electrical energy mathematical model.

7. A series-parallel combined shifting device for electricity metering, characterized in that, include: Voltage front-end module, first current sensor, second current sensor, third current sensor, fourth current sensor, shift module, multi-channel digital-to-analog converter module, and digital signal processing module; The second, third, and fourth current sensors are connected in parallel and then connected in series after the first current sensor. Each current sensor has a different measurement accuracy, with the first current sensor having the largest measurement range. The voltage front-end module is used to acquire the voltage signal of the device under test and transmit the acquired voltage signal to the multi-channel digital-to-analog converter module, which then transmits the primary current signal to the digital signal processing module. The first current sensor is used to collect the primary current signal of the device under test and transmit the collected primary current signal to the multi-channel digital-to-analog converter module, which then transmits the primary current signal to the digital signal processing module. The second, third, and fourth current sensors are all used to collect the secondary current signal of the device under test and transmit the collected secondary current signal to the multi-channel digital-to-analog converter module, which then transmits the secondary current signal to the digital signal processing module. The digital signal processing module is used to determine the target current range corresponding to the primary current signal from multiple preset current ranges, generate the corresponding first shift command according to the target current range, and send the first shift command to the shift module. The multi-channel digital-to-analog converter module is also used to calculate the difference between the primary current signal and the secondary current signal, calibrate the primary current signal collected by the first current sensor based on the difference, and transmit the calibrated primary current signal to the digital signal processing module. The digital signal processing module is also used to calculate the electrical energy generated by the tested equipment during gear switching based on the received voltage signal and the calibrated primary current signal. The shift module is used to determine one of the current sensors from the second current sensor, the third current sensor and the fourth current sensor as the target current sensor based on the received first shift command, and control the first switch to close so that the first current sensor is only connected to the target current sensor. The digital signal processing module is also used to calculate the power and energy of the device under test based on the received voltage signal and secondary current signal.

8. The apparatus according to claim 7, characterized in that, The digital signal processing module is also used to determine whether the primary current signal is greater than a preset current threshold; when the primary current signal is greater than the preset current threshold, the digital signal processing module generates a corresponding second shift command and sends the second shift command to the shift module. The shift module is also used to control the second switch to close and the first switch to open based on the received second shift command; wherein, when the second switch is closed, the first current sensor is turned on by the corresponding diode on the rectifier bridge.

9. The apparatus according to claim 7, characterized in that, The first current sensor is a fluxgate current sensor with a range of 600A.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for performing the method described in any one of claims 1-6.

11. An electronic device, characterized in that, The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-6.

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