Electric power data sampling device and charging and discharging equipment

Abstract

The invention discloses an electric power data sampling device and charging and discharging equipment, which are applied to the technical field of data sampling and are used for solving the problem of relatively poor measurement precision of an electric power data sampling device for wide-range electric power data in the prior art. Specifically, the electric power data acquisition module is used for acquiring a plurality of electric power detection data of a detected element according to different measuring ranges and / or different magnification times; and the control module is used for acquiring the current change range and the analog-to-digital conversion resolution of the power detection data of the detected element, determining target power data from the multiple pieces of power detection data based on the current change range and the analog-to-digital conversion resolution, and performing analog-to-digital conversion on the target power data to obtain actual power data. In this way, through combination of parallel acquisition of multiple ranges and / or multiple magnification times and target power data output by the optimal data source intelligently selected based on the current change range and the analog-to-digital conversion resolution, the measurement range is remarkably widened, and the effective precision is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data sampling, and particularly relates to a power data sampling device and a charge-discharge equipment. BACKGROUND

[0002] In modern power electronic devices and systems, the working current range of a battery management system (BMS), a precision instrument and other devices is often very wide, which can be from several hundred microamperes (μA) to several hundred amperes (A). Such a large range of current variation characteristics poses a serious technical challenge to the power data sampling device.

[0003] At present, the measurement accuracy of the power data sampling device is usually defined by a full-scale calibration method, that is, the nominal accuracy is set based on the maximum range. However, this calibration method has certain limitations and can easily mask the problem of insufficient actual accuracy in small current measurement scenarios. For example, a current sensor with a range of 100 A and a nominal accuracy of 1% has an absolute error of ±1 A. When measuring a 100 A current close to the full range, the ±1 A error is within an acceptable range; however, when measuring a small current of only 1 mA, the absolute error of ±1 A results in a relative error of up to 100000%, significantly affecting the reliability of the measurement result and failing to meet the high-precision measurement requirement. Therefore, the existing power data sampling device generally has a problem of decreased accuracy when facing a wide range of current measurement requirements, and it is difficult to meet the accurate measurement requirement of different orders of magnitude of current. SUMMARY

[0004] The present application provides a power data sampling device and a charge-discharge equipment to solve the problem of poor measurement accuracy of the existing power data sampling device for a wide range of power data.

[0005] The technical scheme provided by the present application is as follows: On the one hand, the present application provides a power data sampling device, comprising: a power data acquisition module and a control module. The input end of the power data acquisition module is connected with a measured element, and the output end of the power data acquisition module is connected with the control module. The power data acquisition module is configured to acquire a plurality of power detection data of the measured element according to different ranges and / or different amplification factors. The control module is configured to obtain a current variation range and an analog-to-digital conversion resolution of the power detection data of the measured element, determine target power data from the plurality of power detection data based on the current variation range and the analog-to-digital conversion resolution, and perform analog-to-digital conversion on the target power data to obtain actual power data.

[0006] Optionally, the power data acquisition module comprises: one current acquisition element and at least two differential amplification circuits; each differential amplification circuit has different amplification multiples; The current acquisition element is connected in series to the branch where the measured element is located; the input end of each differential amplification circuit is connected to the output end of the current acquisition element; and the output end of each differential amplification circuit is connected to the corresponding input end of the control module.

[0007] Optionally, the power data acquisition module comprises: at least two current acquisition elements and one differential amplification circuit; each current acquisition element has different ranges; All the current acquisition elements in the power data acquisition module are connected in parallel to form a current acquisition network, and the current acquisition network is connected in series to the branch where the measured element is located; the output end of each current acquisition element is connected to the corresponding input end of the differential amplification circuit; and each output end of the differential amplification circuit is connected to the corresponding input end of the control module.

[0008] Optionally, the power data acquisition module further comprises: a plurality of main switching switches and one auxiliary switching switch; The auxiliary switching switch is connected in parallel to the current acquisition network; and the control end of the auxiliary switching switch is connected to the control module. Each current acquisition element in the current acquisition network is connected in series to one main switching switch, and the control end of the main switching switch is connected to the control module.

[0009] Optionally, the power data acquisition module comprises at least two current acquisition elements and at least two differential amplification circuits; each current acquisition element has different ranges; All the current acquisition elements in the power data acquisition module are connected in series to form a current acquisition branch, and the current acquisition branch is connected in series to the branch where the measured element is located; the output end of each current acquisition element is connected to the input end of the corresponding differential amplification circuit; and the output end of each differential amplification circuit is connected to the corresponding input end of the control module.

[0010] Optionally, the control module comprises: an analog-to-digital conversion chip and a control chip; The input end of the analog-to-digital conversion chip is connected to the output end of the power data acquisition module; the control end of the analog-to-digital conversion chip is connected to the output end of the control chip, and the output end of the analog-to-digital conversion chip is connected to the input end of the control chip.

[0011] Optionally, the power data sampling device further comprises: a filtering module; The filtering module is connected in series between the output end of the power data acquisition module and the input end of the analog-to-digital conversion chip; The filtering module is used to filter out high-frequency noise output by the power data acquisition module.

[0012] Optionally, the filtering module comprises: at least two filtering circuits; the cutoff frequencies of the at least two filtering circuits are different. All the filtering circuits in the filtering module are connected in parallel to form a filtering network; the output end of the power data acquisition module is connected to the input end of the analog-digital conversion chip through the filtering network.

[0013] Optionally, the power data sampling device further comprises: at least two controllable switches. The controllable switches are arranged in one-to-one correspondence with the differential amplification circuits; the output end of each differential amplification circuit is connected to the control module through a corresponding controllable switch; the control end of each controllable switch is connected to the control module. The controllable switch is used to turn on or turn off the connection between the corresponding differential amplification circuit and the control module.

[0014] In another aspect, the application provides a charging and discharging equipment, comprising: a main control module, a charging and discharging device, and the above-mentioned power data sampling device. The charging and discharging device is connected to an external battery cluster and an external load respectively; the input end of the power data sampling device is connected to the charging and discharging device, and the output end of the power data sampling device is connected to the main control module; the main control module is connected to the control end of the charging and discharging device and the control end of the power data sampling device respectively.

[0015] The beneficial effects of the application are as follows: The application combines the parallel acquisition of multiple ranges and / or multiple amplification factors with the intelligent selection of the target power data output based on the current change range and the analog-digital conversion resolution, significantly improving the range and effective precision of measurement. It solves the contradiction between "small signal precision deficiency" and "large signal easy saturation" of traditional single-range sampling in a wide range, ensuring that the resolution of analog-digital conversion can be fully utilized regardless of signal strength, and obtaining accurate measurement close to the full range. In addition, parallel acquisition reduces the range switching delay, improves sampling efficiency, reduces the dependence on high-cost, high-resolution analog-digital conversion modules, and ultimately realizes high-precision, high-efficiency, and high-reliability sampling of power data in a wide range.

[0016] Other features and advantages of the application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims, and the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings described herein are used to provide further understanding of the application, and form a part of the application. The illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. In the drawings: Figure 1 Figure 1 is a first structural schematic diagram of a power data sampling device according to an embodiment of the present application; Figure 2 Figure 2 is a second structural schematic diagram of a power data sampling device according to an embodiment of the present application; Figure 3 Figure 3 is a third structural schematic diagram of a power data sampling device according to an embodiment of the present application; Figure 4 Figure 4 is a fourth structural schematic diagram of a power data sampling device according to an embodiment of the present application; Figure 5 Figure 5 is a fifth structural schematic diagram of a power data sampling device according to an embodiment of the present application; Figure 6 Figure 6 is a sixth structural schematic diagram of a power data sampling device according to an embodiment of the present application; Figure 7 Figure 7 is a seventh structural schematic diagram of a power data sampling device according to an embodiment of the present application; Figure 8 Figure 8 is an eighth structural schematic diagram of a power data sampling device according to an embodiment of the present application; Figure 9 Figure 9 is a ninth structural schematic diagram of a power data sampling device according to an embodiment of the present application; Figure 10 Figure 10 is a structural schematic diagram of a charge-discharge device according to an embodiment of the present application.

[0018] Figure 1 is a first structural schematic diagram of a power data sampling device according to an embodiment of the present application; DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0020] The present application provides a power data sampling device, as shown in Figure 1 The power data sampling device 100 provided by the present application at least includes a power data collection module 110 and a control module 120. An input end of the power data acquisition module 110 is connected with the measured element, and an output end of the power data acquisition module 110 is connected with the control module 120. The power data acquisition module 110 is configured to acquire a plurality of power detection data of the measured element according to different ranges and / or different amplification factors. The control module 120 is configured to acquire a current variation range and an analog-to-digital conversion resolution of the power detection data of the measured element, determine target power data from the plurality of power detection data based on the current variation range and the analog-to-digital conversion resolution, and perform analog-to-digital conversion on the target power data to obtain actual power data.

[0021] In Figure 1 In the power data sampling device 100 shown, the measured element can be a component element in a circuit or a live conductor, wherein the live conductor is one of a wire, a copper bar, and a PCB, etc. The power detection data is a detection voltage and / or a detection current of the measured element. Different ranges of the power data acquisition module 110 can cover a variation range of the power data of the measured element. The plurality of power detection data of the measured element acquired by the power data acquisition module 110 can be divided into the following three acquisition situations. In the first acquisition situation, the power data acquisition module 110 acquires the plurality of power detection data of the measured element according to the same range and different amplification factors. In the second acquisition situation, the power data acquisition module 110 acquires the plurality of power detection data of the measured element according to different ranges and the same amplification factor. In the third acquisition situation, the power data acquisition module 110 acquires the plurality of power detection data of the measured element according to different ranges and different amplification factors. The analog-to-digital conversion resolution can be externally input or determined by the control module 120 according to the number of bits of analog-to-digital conversion and a reference voltage. The current variation range of the power detection data of the measured element can be externally input or determined by the control module 120 according to historical power detection data. For the above three acquisition situations, the control module 120 determines the target power data in different ways. In the first acquisition situation, the control module 120 selects the power detection data corresponding to the amplification factor matching the current variation range as the target power data. In the second acquisition situation, the control module 120 selects the power detection data corresponding to the range matching the current variation range as the target power data. In the third acquisition situation, the control module 120 selects the power detection data matching both the current variation range and the analog-to-digital conversion resolution as the target power data. After determining the target power data, the control module 120 performs analog-to-digital conversion on the target power data to obtain the actual power data, wherein the actual power data is an actual current value or an actual voltage value of the measured element.

[0022] In this way, the application combines the parallel acquisition of multiple ranges and / or multiple amplification factors with the intelligent selection of optimal data source output based on the current range of variation and analog-to-digital conversion resolution, significantly improving the range and effective precision of measurement. It solves the contradiction between "insufficient precision of small signals" and "easy saturation of large signals" in traditional single-range sampling at a wide range, ensuring that the resolution of analog-to-digital conversion is fully utilized regardless of signal strength, and obtaining accurate measurement close to the full range. In addition, parallel acquisition reduces range switching delay, improves sampling efficiency, reduces dependence on high-cost, high-resolution analog-to-digital conversion chips, and ultimately achieves high-precision, high-efficiency, and high-reliability acquisition of power data in a wide range.

[0023] In specific implementation, the power data acquisition module has multiple structures to achieve its functions, as shown in Figure 2 The power data acquisition module 110 includes a current acquisition element 111 and at least two differential amplification circuits 112; each differential amplification circuit 112 has a different amplification factor; The current acquisition element 111 is connected in series to the branch where the measured element is located; the input end of each differential amplification circuit 112 is connected to the output end of the current acquisition element 111; the output end of each differential amplification circuit 112 is connected to the corresponding input end of the control module 120.

[0024] In Figure 2In the shown power data sampling device 100, one current collection element 111 and at least two differential amplification circuits 112 correspond to the first case described above. The current collection element 111 can be one of a high-precision resistor, a Hall sensor or a CT, and in the case that the differential amplification circuit 112 has a large amplification ratio, a multi-stage amplification circuit architecture can be used inside. The current collection element 111 is connected in series to the branch to be measured, converting the current flowing therethrough into a measurable electrical signal, and its output is directly connected to the input of all differential amplification circuits 112. Each differential amplification circuit 112 has a different amplification factor, and the inputs of the differential amplification circuits 112 are connected in parallel to the output of the current collection element 111, and the outputs of the differential amplification circuits 112 are independently connected to different input channels of the control module 120. In different current ranges, different amplification factors are needed to ensure the accuracy of the signal current measurement. The control module 120 has a pre-set correspondence between the power data range and the amplification factor; when the measured current is small, a differential amplification circuit 112 with a high amplification factor is used to amplify the signal, so as to measure more accurately; when the current is large, a differential amplification circuit 112 with a low amplification factor is used to avoid signal oversaturation and distortion. The control module 120 can expand the measurement range while maintaining accuracy through different differential amplification circuits 112. After the control module 120 obtains the current variation range of the power detection data of the measured element, it can determine the amplification factor corresponding to the current variation range as the target amplification factor from the pre-set correspondence between the power data range and the amplification factor, and the power detection data output by the differential amplification circuit 112 corresponding to the target amplification factor as the target power data.

[0025] In specific implementation, the power data acquisition module has various structures to achieve its functions, which are described in detail below. Figure 3 As shown, the power data acquisition module 110 includes at least two current collection elements 111 and one differential amplification circuit 112; each current collection element 111 has a different range; All current collection elements 111 in the power data acquisition module 110 are connected in parallel to form a current collection network, which is connected in series to the branch where the measured element is located; the output of each current collection element 111 is connected to the corresponding input of the differential amplification circuit 112; and the outputs of the differential amplification circuit 112 are connected to the corresponding inputs of the control module 120.

[0026] In Figure 3In the shown power data sampling device 100, the arrangement of at least two current collection elements 111 and one differential amplifier circuit 112 corresponds to the second case described above. The current collection network is connected in series to the branch where the measured element is located, wherein each current collection element 111 converts the current flowing therethrough into a measurable electrical signal, and the output thereof is directly connected to the input of the differential amplifier circuit 112, and the output of the differential amplifier circuit 112 is connected to different input channels of the control module 120. In different current ranges, different ranges are required to ensure the accuracy of current measurement. The control module 120 is pre-provided with a corresponding relationship between the power data range and the range; when the measured current is small, a small-range current collection element 111 is used for data collection, so as to more accurately collect data; and when the current is large, a large-range current collection element 111 is used for data collection, so as to avoid damaging the device. The control module 120 can expand the measurement range while maintaining the accuracy through the current collection element 111 of different ranges. After the control module 120 obtains the current variation range of the power detection data of the measured element, the range corresponding to the current variation range can be determined from the pre-provided corresponding relationship between the power data range and the range as the target range, and the power detection data output by the current collection element 111 corresponding to the target range is taken as the target power data.

[0027] In one possible implementation, referring to Figure 4 As shown, the power data collection module 110 further comprises a plurality of main switching switches 113 and an auxiliary switching switch 114. The auxiliary switching switch 114 is connected in parallel to the current collection network; and the control end of the auxiliary switching switch 114 is connected to the control module 120.

[0028] Each current collection element 111 in the current collection network is connected in series to one main switching switch 113, and the control end of the main switching switch 113 is connected to the control module 120.

[0029] In Figure 4The main switch 113 and the auxiliary switch 114 in the power data sampling device 100 shown in the figure can be one of a relay, an electronic switch and an analog switch. In addition to selecting the target power data by controlling the channel receiving the input data of the current collection element 111, the control module 120 can directly connect the corresponding current collection element 111 and disconnect other current collection elements 111 by controlling the main switch 113 and the auxiliary switch 114, so as to reduce the data receiving amount of the control module 120. The control module 120 controls the corresponding main switch 113 to be turned on to connect the corresponding current collection element 111 to collect data. The auxiliary switch 114 is provided to switch between different range current collection elements 111 under the premise of ensuring the continuity of the current, that is, when switching, the auxiliary switch 114 is turned on first, then the main switch 113 of the current collection element 111 currently connected is turned off, then the main switch 113 of the current collection element 111 to be connected is turned on, and finally the auxiliary switch 114 is turned off.

[0030] In specific implementation, the power data collection module has various structures to realize its functions, which can be referred to in the following description. Figure 5 As shown in the figure, the power data collection module 110 includes at least two current collection elements 111 and at least two differential amplification circuits 112; each current collection element 111 has different ranges. All the current collection elements 111 in the power data collection module 110 are connected in series to form a current collection branch, and the current collection branch is connected in series to the branch where the measured element is located; the output end of each current collection element 111 is connected to the input end of the corresponding differential amplification circuit 112; and the output end of each differential amplification circuit 112 is connected to the corresponding input end of the control module 120.

[0031] In the third case, Figure 5 In the power data sampling device 100 shown in the figure, the at least two current collection elements 111 and the at least two differential amplification circuits 112 correspond to the third case described above. The amplification ratios of the differential amplification circuits 112 can be the same or different, and the data collected by each current collection element 111 is input to the control module 120 after being amplified by a corresponding differential amplification circuit 112. The control module 120 can select the power detection data matching the range and the analog-to-digital conversion resolution as the target power data.

[0032] In specific implementation, the control module has various structures to realize its functions, which can be referred to in the following description. Figure 6 As shown in the figure, the control module 120 includes an analog-to-digital conversion chip 121 and a control chip 122. An input end of the analog-digital conversion chip 121 is connected with an output end of the power data acquisition module 110; a control end of the analog-digital conversion chip 121 is connected with an output end of the control chip 122, and an output end of the analog-digital conversion chip 121 is connected with an input end of the control chip 122.

[0033] In Figure 6 In the power data sampling device 100 shown in the figure, the analog-digital conversion chip 121 is mainly used for analog-digital conversion of target power data to obtain actual power data. The control module 120 is used for determining the target power data from a plurality of power detection data based on a current variation range of the power detection data of the measured element and an analog-digital conversion resolution. The target power data can be determined by the control module 120 selecting the channel corresponding to the analog-digital conversion chip 121 to select the target power data, or by controlling the corresponding switch to select the target power data. Optionally, the control module 120 can be one of an MCU, a DSP and other controllers provided with an internal ADC peripheral module. The input end of the internal ADC module of the control module 120 is provided with a clamping diode to avoid damaging the analog-digital conversion module.

[0034] In a possible implementation, referring to Figure 7 As shown in the figure, the power data sampling device 100 further comprises a filtering module 130. The filtering module 130 is connected in series between the output end of the power data acquisition module 110 and the input end of the analog-digital conversion chip 121. The filtering module 130 is used for filtering high-frequency noise output by the power data acquisition module 110.

[0035] Specifically, referring to Figure 7 As shown in the figure, the filtering module 130 comprises at least two filtering circuits 131; the cutoff frequencies of the at least two filtering circuits 131 are different. All the filtering circuits 131 in the filtering module 130 are connected in parallel to form a filtering network; the output end of the power data acquisition module 110 is connected to the input end of the analog-digital conversion chip 121 through the filtering network.

[0036] In practical applications, the filter circuit 131 can be an RC filter circuit, a pi filter circuit or an active filter circuit. When the element to be measured is an inductive element, the inductive element can have a current discontinuity. In the discontinuous section, a filter circuit 131 with a high cutoff frequency can be used to average the non-continuous signal. For example, in a BOOST circuit, the inductor current is discontinuous in the non-continuous mode of the BOOST circuit. The average value of the inductor conduction current collected is greater than the actual input current. By setting two filter circuits 131 with different cutoff frequencies, the control module 120 controls the filter circuit 131 with a larger cutoff frequency to filter when the current is greater than the preset current value, and obtains a sampling value close to the input current after averaging the collected non-continuous current signal. The control module 120 controls the filter circuit 131 with a smaller cutoff frequency to filter when the current is less than the preset value. The control of the control module 120 to the filter circuit 131 can also be realized by channel gating, or a controllable switch 140 is connected in series with each filter circuit 131, and the control module 120 controls the state of the controllable switch 140 connected in series with the filter circuit 131. In order to more accurately collect the current, the inductor current can be more finely segmented according to a plurality of preset current values, and each segment corresponds to a filter circuit 131.

[0037] In one possible implementation, referring to FIG. 1, Figure 8 and Figure 9 The power data sampling device 100 further comprises at least two controllable switches 140. The controllable switches 140 are arranged one-to-one with the differential amplification circuits 112. The output end of each differential amplification circuit 112 is connected to the control module 120 through the corresponding controllable switch 140. The control end of each controllable switch 140 is connected to the control module 120. The controllable switch 140 is used to turn on or turn off the connection between the corresponding differential amplification circuit 112 and the control module 120.

[0038] In practical applications, the controllable switch 140 can be one of a relay, an electronic switch and an analog switch. In the power data sampling device 100 shown in FIG. 1, Figure 8 The control module 120 controls the corresponding controllable switch 140 to be conductive to turn on the corresponding differential amplification circuit 112, so as to select the power detection data corresponding to the amplification multiple matching the current change range as the target power data. In the power data sampling device 100 shown in FIG. 1, Figure 9 The control module 120 controls the corresponding controllable switch 140 to be conductive to turn on the corresponding current sampling element and differential amplification circuit 112, so as to select the power detection data matching both the current change range and the analog-to-digital conversion resolution as the target power data.

[0039] Based on the above embodiment, the application provides a charging and discharging device, referring to Figure 10 As shown in the figure, the application provides a charging and discharging device 200, which at least comprises a main control module 210, a charging and discharging device 220 and the above-mentioned power data sampling device 100. The charging and discharging device 220 is connected with an external battery cluster and an external load respectively; the input end of the power data sampling device 100 is connected with the charging and discharging device 220, and the output end of the power data sampling device 100 is connected with the main control module 210; the main control module 210 is connected with the control end of the charging and discharging device 220 and the control end of the power data sampling device 100 respectively.

[0040] It should be noted that the principle of solving the technical problem of the charging and discharging device 200 provided by the application is similar to that of the power data sampling device 100 provided by the application, therefore, the implementation of the charging and discharging device 200 provided by the application can be referred to the implementation of the power data sampling device 100 provided by the application, and the repeated parts will not be described in detail.

[0041] It should be noted that although several units or sub-units of the device are mentioned in the above detailed description, such division is only exemplary and not mandatory. In fact, according to the embodiments of the application, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of one unit described above can be further divided into multiple units for embodiment.

[0042] In addition, although the operations of the method of the application are described in a specific order in the drawings, this does not require or imply that the operations must be performed in that specific order, or that all of the illustrated operations must be performed to achieve the desired result. Additionally or alternatively, certain steps can be omitted, combined into a single step, and / or divided into multiple steps.

[0043] Although the preferred embodiments of the application have been described, those skilled in the art who have the benefit of the basic inventive concept can make further changes and modifications to the embodiments. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the application.

[0044] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the application without departing from the spirit and scope of the embodiments of the application. Thus, if these modifications and variations of the embodiments of the application fall within the scope of the claims of the application and their equivalents, the application also intends to include these modifications and variations.

Claims

1. An electric power data sampling device, characterized by, The utility model relates to a kind of power data acquisition module and control module; The input of the power data acquisition module is connected with the measured element, and the output of the power data acquisition module is connected with the control module; The power data acquisition module is used to collect multiple power detection data of the measured element according to different ranges and / or different amplification factors; The control module is used to obtain the current variation range and the analog-digital conversion resolution of the power detection data of the measured element, determine the target power data from the multiple power detection data based on the current variation range and the analog-digital conversion resolution, and obtain the actual power data by analog-digital conversion on the target power data. The power data acquisition module includes a current acquisition element and at least two differential amplification circuits, and the amplification factor of each differential amplification circuit is different; 2. The power data sampling apparatus of claim 1, wherein, The current acquisition element is connected in series to the branch where the measured element is located, the input of each differential amplification circuit is connected to the output of the current acquisition element, and the output of each differential amplification circuit is connected to the corresponding input of the control module. The power data acquisition module includes at least two current acquisition elements and one differential amplification circuit, and the range of each current acquisition element is different; 3. The power data sampling apparatus of claim 1, wherein, All current acquisition elements in the power data acquisition module are connected in parallel to form a current acquisition network, the current acquisition network is connected in series to the branch where the measured element is located, the output of each current acquisition element is connected to the corresponding input of the differential amplification circuit, and each output of the differential amplification circuit is connected to the corresponding input of the control module. The power data acquisition module further includes a plurality of main switching switches and an auxiliary switching switch; 4. The power data sampling apparatus of claim 3, wherein, The auxiliary switching switch is connected in parallel to the current acquisition network, and the control end of the auxiliary switching switch is connected to the control module. Each current acquisition element in the current acquisition network is connected in series to one main switching switch, and the control end of the main switching switch is connected to the control module. The power data acquisition module includes at least two current acquisition elements and at least two differential amplification circuits, and the range of each current acquisition element is different; 5. The power data sampling apparatus of claim 1, wherein, All current acquisition elements in the power data acquisition module are connected in series to form a current acquisition branch, the current acquisition branch is connected in series to the branch where the measured element is located, the output of each current acquisition element is connected to the input of the corresponding differential amplification circuit, and the output of each differential amplification circuit is connected to the corresponding input of the control module. The control module includes an analog-digital conversion chip and a control chip.

6. The power data sampling device of any one of claims 1-5, wherein, The input of the analog-digital conversion chip is connected to the output of the power data acquisition module, the control end of the analog-digital conversion chip is connected to the output of the control chip, and the output of the analog-digital conversion chip is connected to the input of the control chip. Further includes:

7. The power data sampling apparatus of claim 6, wherein, a filtering module; The filtering module is connected in series between the output of the power data acquisition module and the input of the analog-digital conversion chip. The filtering module is used to filter out high-frequency noise output by the power data acquisition module. ​ 8. The power data sampling apparatus of claim 7, wherein, The filter module comprises at least two filter circuits, and the cutoff frequencies of the at least two filter circuits are different. All filter circuits in the filter module are connected in parallel to form a filter network, and an output end of the power data acquisition module is connected to an input end of the analog-digital conversion chip through the filter network.

9. The power data sampling apparatus of claim 2 or 5, wherein Further comprising: At least two controllable switches; The controllable switches are arranged in one-to-one correspondence with the differential amplification circuits, an output end of each differential amplification circuit is connected to the control module through a corresponding controllable switch, and a control end of each controllable switch is connected to the control module; The controllable switch is used to turn on or turn off the connection between the corresponding differential amplification circuit and the control module.

10. A charge and discharge device, characterized by comprising: Comprise: A main control module, a charge-discharge device and the power data sampling device as claimed in any one of claims 1-9; The charge-discharge device is connected to an external battery cluster and an external load respectively, an input end of the power data sampling device is connected to the charge-discharge device, an output end of the power data sampling device is connected to the main control module, and the main control module is connected to a control end of the charge-discharge device and a control end of the power data sampling device respectively.

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