Charging pile electric energy detection system based on wide dynamic range measurement

Abstract

The invention relates to a charging pile electric energy detection system based on wide dynamic range measurement. The charging pile electric energy detection system comprises a sensing acquisition module, a signal processing module, a data storage module and a display module, the sensing acquisition module is used for acquiring electric signal information of the charging pile in the charging process; the signal processing module is used for processing the collected signals to obtain accurate detection data; the data storage module is used for storing data information detected in the charging process; the display module is used for displaying charging information in real time; according to the invention, the voltage and current values obtained through direct measurement can be corrected in different charging stages, the interference of factors such as heat generated in the charging process on measurement is reduced, and more accurate charging electric energy data are obtained.

Description

Technical Field

[0001] The present application relates to the field of charging pile power detection, and more specifically, to a charging pile power detection system based on wide dynamic range measurement. Background Art

[0002] With the development of electric vehicles, more and more charging piles are installed in various places to meet the needs of electric vehicle charging. During the charging process, accurate power data is needed to optimize the charging process. However, heat is generated during the charging process, and the power data directly measured is often not very accurate. Therefore, a more advanced detection system is needed to detect and obtain real charging data.

[0003] Now many electric energy detection systems have been developed. After a lot of searching and reference, it is found that the existing charging pile systems are such as the system disclosed in the publication number CN117277525B. These systems generally include a power processing module for connecting to the mains and processing the mains; an intelligent control module for signal reception and module control; a fast charging module and a slow charging module, both of which are used to connect to the power consumption equipment and receive electric energy, and the connection detection module detects the connection status with the power consumption equipment; a mode control module for logical calculation and control of the charging and discharging of the power control module; an electric energy detection module for isolation and power failure detection; a power control module for energy storage and release and voltage regulation of electric energy; a bus control module for electric energy collection, storage and distribution and boosting the distribution voltage. However, this system optimizes and controls the charging process after obtaining the electric energy data, and cannot directly obtain accurate electric energy data. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a charging pile power detection system based on wide dynamic range measurement, which can correct the voltage and current values ​​directly measured at different stages of charging, reduce the interference to the measurement caused by factors such as heat generated during the charging process, and obtain more accurate charging power data.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] The embodiment of the present application provides a charging pile power detection system based on wide dynamic range measurement, including a sensor acquisition module, a signal processing module, a data storage module and a display module;

[0007] The sensing acquisition module is used to collect the electrical signal information of the charging pile during the charging process, the signal processing module is used to process the collected signals to obtain accurate detection data, the data storage module is used to save the data information detected during the charging process, and the display module is used to display the charging information in real time;

[0008] The sensing acquisition module includes a current acquisition unit, a voltage acquisition unit and a power calculation unit. The current acquisition unit is used to collect the output current information of the charging pile, the voltage acquisition unit is used to collect the output voltage information of the charging pile, and the power calculation unit is used to calculate the real-time charging power of the charging pile;

[0009] The signal processing module includes a signal conversion unit, a data cleaning unit and a detection adjustment unit, wherein the signal conversion unit is used to convert the detection signal into a specific detection value, the data cleaning unit is used to filter the interfering data, and the detection adjustment unit adjusts the detection value based on the charging stage;

[0010] The data storage module includes a local storage unit and a remote storage unit, wherein the local storage unit is used to record and save the electric energy data during the entire charging process, and the remote storage unit is used to synchronize the complete charging data to a remote server;

[0011] The display module includes a digital display unit and a display driving unit, wherein the digital display unit is used to display data and graphic information, and the display driving unit is used to process the data to obtain a data form that can be directly displayed by the digital display unit;

[0012] Further, the power calculation unit includes a power register, a multiplication processor and a power correction processor, the power register is used to store the power change data during the charging process, the multiplication processor is used to multiply the received voltage value and current value to obtain the power value, and the power correction processor corrects the calculated power value based on the power change data;

[0013] Furthermore, the power correction processor calculates the current power value P C With the previous power value P L When the absolute value of the difference ΔP is greater than the continuity judgment threshold Yp, it means that the calculated power value needs to be corrected, and the correction is performed according to the following formula:

[0014]

[0015] Among them, λ is the adjustment coefficient, P′ is the corrected power value and is recorded in the power register;

[0016] Further, the detection and adjustment unit includes a data pairing processor, a stage identification processor and a value adjustment processor, the data pairing processor is used to pair the voltage and current values ​​with the power values, the stage identification processor determines the current charging stage based on the voltage circuit value, and the value adjustment processor adjusts the voltage and current values ​​based on the charging stage and the power value;

[0017] Furthermore, the value adjustment processor adjusts the voltage value according to the following formula during the constant current charging stage:

[0018]

[0019] Where Ic represents the initial current in the constant current stage, P′(t) represents the power correction value at time t, is the time element, T is the current moment, k1 is the voltage adjustment coefficient, and U' is the adjusted voltage;

[0020] In the constant current charging stage, Ic is directly used as the adjusted current;

[0021] The value adjustment processor adjusts the current value according to the following formula during the constant voltage charging stage:

[0022]

[0023] Wherein, Uc represents the initial voltage in the constant voltage stage, k2 is the current adjustment coefficient, and I' is the adjusted current;

[0024] In the constant voltage charging stage, Uc is directly used as the adjusted voltage.

[0025] Compared with the prior art, the beneficial effects of the present invention are: the system corrects the measured data based on the electric energy characteristics of different charging stages to obtain data that is closer to the actual situation, which can effectively reduce the impact of heat on the measurement, and before correcting the measured voltage and current, the power is preliminarily corrected based on the continuity of the power, and the correction of the voltage and current is processed with the corrected power, which can reduce the interference caused by some unexpected factors in the measurement and make the correction of the voltage and current more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structural framework of the present invention;

[0028] Figure 2 This is a schematic diagram of the signal processing module of the present invention;

[0029] Figure 3 It is a schematic diagram of the power calculation unit of the present invention;

[0030] Figure 4This is a schematic diagram of the data cleaning unit of the present invention;

[0031] Figure 5 It is a schematic diagram of the detection and adjustment unit of the present invention. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0033] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0034] The terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and should not be understood as indicating or implying relative importance, nor should they be understood as requiring or implying any such actual relationship or order between these entities or operations.

[0035] This embodiment provides a charging pile power detection system based on wide dynamic range measurement, combined with Figure 1 , including a sensing acquisition module, a signal processing module, a data storage module and a display module;

[0036] The sensing acquisition module is used to collect the electrical signal information of the charging pile during the charging process, the signal processing module is used to process the collected signals to obtain accurate detection data, the data storage module is used to save the data information detected during the charging process, and the display module is used to display the charging information in real time;

[0037] The sensing acquisition module includes a current acquisition unit, a voltage acquisition unit and a power calculation unit. The current acquisition unit is used to collect the output current information of the charging pile, the voltage acquisition unit is used to collect the output voltage information of the charging pile, and the power calculation unit is used to calculate the real-time charging power of the charging pile;

[0038] The signal processing module includes a signal conversion unit, a data cleaning unit and a detection adjustment unit, wherein the signal conversion unit is used to convert the detection signal into a specific detection value, the data cleaning unit is used to filter the interfering data, and the detection adjustment unit adjusts the detection value based on the charging stage;

[0039] The data storage module includes a local storage unit and a remote storage unit, wherein the local storage unit is used to record and save the electric energy data during the entire charging process, and the remote storage unit is used to synchronize the complete charging data to a remote server;

[0040] The display module includes a digital display unit and a display driving unit, wherein the digital display unit is used to display data and graphic information, and the display driving unit is used to process the data to obtain a data form that can be directly displayed by the digital display unit;

[0041] The power calculation unit includes a power register, a multiplication processor and a power correction processor, wherein the power register is used to store power change data during the current charging process, the multiplication processor is used to multiply the received voltage value and current value to obtain a power value, and the power correction processor corrects the calculated power value based on the power change data;

[0042] The power correction processor calculates the current power value P C With the previous power value P L When the absolute value of the difference ΔP is greater than the continuity judgment threshold Yp, it means that the calculated power value needs to be corrected, and the correction is performed according to the following formula:

[0043]

[0044] Among them, λ is the adjustment coefficient, P′ is the corrected power value and is recorded in the power register;

[0045] The detection and adjustment unit includes a data pairing processor, a stage identification processor and a value adjustment processor, wherein the data pairing processor is used to pair the voltage and current values ​​with the power values, the stage identification processor determines the current charging stage based on the voltage circuit value, and the value adjustment processor adjusts the voltage and current values ​​based on the charging stage and the power value;

[0046] The value adjustment processor adjusts the voltage value according to the following formula during the constant current charging stage:

[0047]

[0048] Where Ic represents the initial current in the constant current stage, P′(t) represents the power correction value at time t, is the time element, T is the current moment, k1 is the voltage adjustment coefficient, and U' is the adjusted voltage;

[0049] In the constant current charging stage, Ic is directly used as the adjusted current;

[0050] The value adjustment processor adjusts the current value according to the following formula during the constant voltage charging stage:

[0051]

[0052] Wherein, Uc represents the initial voltage in the constant voltage stage, k2 is the current adjustment coefficient, and I' is the adjusted current;

[0053] In the constant voltage charging stage, Uc is directly used as the adjusted voltage.

[0054] Embodiment 2.

[0055] This embodiment includes all the contents of the first embodiment, and provides a charging pile power detection system based on wide dynamic range measurement, including a sensor acquisition module, a signal processing module, a data storage module and a display module;

[0056] The sensing acquisition module is used to collect the electrical signal information of the charging pile during the charging process, the signal processing module is used to process the collected signals to obtain accurate detection data, the data storage module is used to save the data information detected during the charging process, and the display module is used to display the charging information in real time;

[0057] The sensing acquisition module includes a current acquisition unit, a voltage acquisition unit and a power calculation unit. The current acquisition unit is used to collect the output current information of the charging pile, the voltage acquisition unit is used to collect the output voltage information of the charging pile, and the power calculation unit is used to calculate the real-time charging power of the charging pile;

[0058] Combination Figure 2 , the signal processing module includes a signal conversion unit, a data cleaning unit and a detection adjustment unit, the signal conversion unit is used to convert the detection signal into a specific detection value, the data cleaning unit is used to filter the interference data, and the detection adjustment unit adjusts the detection value based on the charging stage;

[0059] The data storage module includes a local storage unit and a remote storage unit, wherein the local storage unit is used to record and save the electric energy data during the entire charging process, and the remote storage unit is used to synchronize the complete charging data to a remote server;

[0060] The display module includes a digital display unit and a display driving unit, wherein the digital display unit is used to display data and graphic information, and the display driving unit is used to process the data to obtain a data form that can be directly displayed by the digital display unit;

[0061] The detection of the system during the charging process includes the following steps:

[0062] S1. The current acquisition unit acquires current signals, the voltage acquisition unit acquires voltage signals, and sends the acquired signals to the signal processing module;

[0063] S2, the signal conversion unit converts the signal data into a voltage value and a current value, and sends them to the data cleaning unit and the power calculation unit respectively;

[0064] S3, the power calculation unit calculates the charging power and sends it to the detection and adjustment unit;

[0065] S4, the data cleaning unit performs interference judgment on the voltage value and the current value, and sends the judgment result to the detection and adjustment unit;

[0066] S5, the detection and adjustment unit determines the charging stage based on the voltage value and the current value, and adjusts the voltage value and the current value in combination with the power value and the charging stage;

[0067] S6, sending the adjusted voltage and current values ​​to the data storage module and the display module respectively;

[0068] The current acquisition unit includes a current sensor, a signal amplification processor and an analog-to-digital conversion processor, wherein the current sensor is used to detect the output current electrical signal of the charging pile, the signal amplification processor is used to amplify the current electrical signal, and the analog-to-digital conversion processor is used to convert the amplified analog current electrical signal into a digital current electrical signal;

[0069] The voltage acquisition unit includes a voltage sensor, a signal amplification processor and an analog-to-digital conversion processor. The voltage sensor is used to detect the output voltage electrical signal of the charging pile, the signal amplification processor is used to amplify the voltage electrical signal, and the analog-to-digital conversion processor is used to convert the amplified analog voltage electrical signal into a digital voltage electrical signal;

[0070] The signal amplification processor and analog-to-digital conversion processor in the current acquisition unit and the voltage acquisition unit have the same structure and function. They are just installed in different acquisition units, so there is no difference in naming.

[0071] The signal conversion unit includes a conversion parameter register and a conversion calculation processor, wherein the conversion parameter register is used to store parameters for current and voltage conversion, and the conversion calculation processor uses the parameters to convert the digital electrical signal into corresponding current and voltage values;

[0072] The conversion calculation processor calculates the real-time voltage U and current I according to the following formula:

[0073] U=α1·v1+β1;

[0074] I = α2·v2+β2;

[0075] Among them, α1 and β1 are conversion parameters of voltage, α2 and β2 are conversion parameters of current, v1 is the digital voltage signal value, and v2 is the digital current signal value;

[0076] Combination Figure 3 The power calculation unit includes a power register, a multiplication processor and a power correction processor, wherein the power register is used to store the power change data during the charging process, the multiplication processor is used to multiply the received voltage value and current value to obtain the power value, and the power correction processor corrects the calculated power value based on the power change data;

[0077] The power correction processor calculates the current power value P C With the previous power value P L When the absolute value of the difference ΔP is greater than the continuity judgment threshold Yp, it means that the calculated power value needs to be corrected, and the correction is performed according to the following formula:

[0078]

[0079] Among them, λ is the adjustment coefficient, P′ is the corrected power value and is recorded in the power register;

[0080] Combination Figure 4 , the data cleaning unit includes an interference judgment processor and a result output processor, the interference judgment processor is used to make interference judgment on the received voltage value and current value, and the result output processor outputs corresponding content to the detection adjustment unit based on the judgment result;

[0081] The interference judgment processor calculates the interference indexes FU and FI of the voltage value and the current value according to the following formula:

[0082]

[0083] Among them, U L is the previous voltage value, U N is the next voltage value, I L is the previous current value, IN is the next current value;

[0084] When a value of the voltage interference index and the current interference index is greater than the interference threshold, it means that the voltage value and the current value are interfered with;

[0085] It should be noted that the calculation of the interference index is not immediate and needs to wait for the next voltage and current value to be received before calculation;

[0086] If the voltage value and the current value are determined to be interfering, the result output processor resets the voltage value and the current value to 0 and outputs them to the detection and adjustment unit; otherwise, the original voltage value and the current value are directly output;

[0087] Combination Figure 5 The detection and adjustment unit includes a data pairing processor, a stage identification processor and a value adjustment processor, wherein the data pairing processor is used to pair the voltage and current values ​​with the power values, the stage identification processor determines the current charging stage based on the voltage circuit value, and the value adjustment processor adjusts the voltage and current values ​​based on the charging stage and the power value;

[0088] The data pairing processor pairs the voltage and current values ​​with the power values ​​in sequence, and when the voltage and current values ​​are 0, the corresponding power values ​​are discarded at the same time;

[0089] The charging process of the charging pile for the electric vehicle battery includes four stages: pre-charging stage, constant current charging stage, constant voltage charging stage and trickle charging stage;

[0090] In the pre-charging stage, the voltage and current values ​​are both small, which is the initial stage of charging, and there is no need to adjust the measured voltage and current values;

[0091] In the constant current charging stage, the current remains constant. In the second stage of charging, the measured voltage value is calculated and adjusted;

[0092] In the constant voltage charging stage, the voltage remains constant, which is the third stage of charging, and the measured current value is calculated and adjusted;

[0093] In the trickle charging stage, the current is at a very low level and the voltage remains basically unchanged. This is the final stage of charging and is used to maintain the battery at full charge. There is no need to adjust the measured voltage and current values.

[0094] The value adjustment processor adjusts the voltage value according to the following formula during the constant current charging stage:

[0095]

[0096] Where Ic represents the initial current in the constant current stage, P′(t) represents the power correction value at time t, is the time element, T is the current moment, k1 is the voltage adjustment coefficient, and U' is the adjusted voltage;

[0097] In the constant current charging stage, Ic is directly used as the adjusted current;

[0098] The value adjustment processor adjusts the current value according to the following formula during the constant voltage charging stage:

[0099]

[0100] Wherein, Uc represents the initial voltage in the constant voltage stage, k2 is the current adjustment coefficient, and I' is the adjusted current;

[0101] In the constant voltage charging stage, Uc is directly used as the adjusted voltage.

[0102] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A charging pile power detection system based on wide dynamic range measurement, characterized in that: It includes a sensor acquisition module, a signal processing module, a data storage module and a display module; The sensor acquisition module is used to collect electrical signal information of the charging pile during the charging process; The signal processing module is used to process the collected signals to obtain accurate detection data; The data storage module is used to store data information detected during the charging process; The display module is used to display charging information in real time; The sensing acquisition module includes a current acquisition unit, a voltage acquisition unit and a power calculation unit. The current acquisition unit is used to collect the output current information of the charging pile, the voltage acquisition unit is used to collect the output voltage information of the charging pile, and the power calculation unit is used to calculate the real-time charging power of the charging pile; The signal processing module includes a signal conversion unit, a data cleaning unit and a detection adjustment unit, wherein the signal conversion unit is used to convert the detection signal into a specific detection value, the data cleaning unit is used to filter the interfering data, and the detection adjustment unit adjusts the detection value based on the charging stage; The data storage module includes a local storage unit and a remote storage unit, wherein the local storage unit is used to record and save the electric energy data during the entire charging process, and the remote storage unit is used to synchronize the complete charging data to a remote server; The display module comprises a digital display unit and a display driving unit. The digital display unit is used to display data and graphic information. The display driving unit is used to process the data to obtain a data form that can be directly displayed by the digital display unit.

2. A charging pile power detection system based on wide dynamic range measurement according to claim 1, characterized in that: The power calculation unit includes a power register, a multiplication processor and a power correction processor. The power register is used to store the power change data during the charging process. The multiplication processor is used to multiply the received voltage value and current value to obtain the power value. The power correction processor corrects the calculated power value based on the power change data.

3. A charging pile power detection system based on wide dynamic range measurement according to claim 2, characterized in that: The power correction processor calculates the current power value P C With the previous power value P L When the absolute value of the difference ΔP is greater than the continuity judgment threshold Yp, it means that the calculated power value needs to be corrected, and the correction is performed according to the following formula: Among them, λ is the adjustment coefficient, and P′ is the corrected power value and is recorded in the power register.

4. A charging pile power detection system based on wide dynamic range measurement according to claim 3, characterized in that: The detection and adjustment unit includes a data pairing processor, a stage identification processor and a numerical adjustment processor. The data pairing processor is used to pair the voltage and current values ​​with the power values. The stage identification processor determines the current charging stage based on the voltage circuit value. The numerical adjustment processor adjusts the voltage and current values ​​based on the charging stage and the power value.

5. A charging pile power detection system based on wide dynamic range measurement according to claim 4, characterized in that: The value adjustment processor adjusts the voltage value according to the following formula during the constant current charging stage: Where Ic represents the initial current in the constant current stage, P′(t) represents the power correction value at time t, is the time element, T is the current moment, k1 is the voltage adjustment coefficient, and U' is the adjusted voltage; In the constant current charging stage, Ic is directly used as the adjusted current; The value adjustment processor adjusts the current value according to the following formula during the constant voltage charging stage: Wherein, Uc represents the initial voltage in the constant voltage stage, k2 is the current adjustment coefficient, and I' is the adjusted current; In the constant voltage charging stage, Uc is directly used as the adjusted voltage.

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