CN113281673A - Direct current electric quantity calculation device and method - Google Patents
Direct current electric quantity calculation device and method Download PDFInfo
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- CN113281673A CN113281673A CN202110563465.8A CN202110563465A CN113281673A CN 113281673 A CN113281673 A CN 113281673A CN 202110563465 A CN202110563465 A CN 202110563465A CN 113281673 A CN113281673 A CN 113281673A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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Abstract
The embodiment of the invention discloses a direct current electric quantity calculating device and a method, wherein a voltage detection unit, a data processing unit, a high-voltage isolation unit and a power supply processing unit are integrated into an integrated direct current electric quantity calculating device which is electrically connected to a high-voltage storage battery pack, a weak voltage signal generated by the voltage detection unit is processed into a target digital signal by using the data processing unit, the target electric quantity calculation of the high-voltage storage battery pack is completed by adopting current integration, and then the target electric quantity is sent to a main control unit of a storage battery pack management system of the high-voltage storage battery pack, so that the high-speed and high-precision current acquisition and electric quantity calculation functions are realized, and the main control unit of the storage battery pack management system can timely master the electric quantity state of the high-voltage storage battery pack; and the high-voltage isolation unit isolates the high-voltage side from the low-voltage safety side, the withstand voltage value of the high-voltage isolation unit can reach AC5000Vrms, the equipment safety and the personnel safety are further ensured, and the direct current electric quantity calculation equipment which is low in cost, high in stability and easy to use can be provided.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a direct current electric quantity calculating device and a direct current electric quantity calculating method.
Background
The storage battery is an energy storage device capable of converting chemical energy into electric energy, and the storage battery is applied to various industries along with the development of novel storage battery technology. At present, the subway tunnel construction in China adopts a shield machine for excavation, the muck generated in the excavation process is transported to a wellhead through a tunnel horizontal transportation electric locomotive, and construction materials such as duct pieces, mortar and the like are transported to the interior of the tunnel from the wellhead through the tunnel horizontal transportation electric locomotive. The storage battery system provides electric energy for the tunnel horizontal transport electric locomotive to drive the tunnel horizontal transport electric locomotive to walk.
Because the battery system has higher voltage and wide output current range, the current acquisition and electric quantity calculation difficulty is higher. Current prior art adopts hall sensor to gather electric current, and hall sensor converts current signal to voltage signal through magnetic induction technology, transmits for collection module through the wire, because hall sensor sampling precision is limited, and analog signal receives the interference through the wire transmission easily, leads to electric current collection precision to be limited, and battery system electric quantity calculation deviation is great.
Disclosure of Invention
The invention mainly aims to provide direct current electric quantity calculation equipment and a direct current electric quantity calculation method, which can solve the problems that the current acquisition precision is limited and the electric quantity calculation deviation of a storage battery system is large in the prior art.
To achieve the above object, a first aspect of the present invention provides a dc power calculating apparatus, including: the device comprises a voltage detection unit, a data processing unit, a high-voltage isolation unit and a power supply processing unit; the output end of the voltage detection unit is electrically connected with the input end of the data processing unit, the output end of the data processing unit is electrically connected with the high-voltage side input end of the high-voltage isolation unit, the output end of the power supply processing unit is electrically connected with the low-voltage side input end of the high-voltage isolation unit, the voltage detection unit, the data processing unit, the high-voltage isolation unit and the power supply processing unit are integrated into a whole to form the equipment, and the equipment is connected with a high-voltage storage battery pack in series;
the high-voltage storage battery pack is used for storing energy and is a calculation target of the direct current electric quantity calculation equipment;
the voltage detection unit is used for detecting weak voltage signals corresponding to the currents at the two ends of the high-voltage storage battery pack;
the data processing unit is used for performing signal transformation on the weak voltage signal to obtain a target digital signal of the high-voltage storage battery pack and a target electric quantity corresponding to the target digital signal, and transmitting the target electric quantity to a main control unit of a storage battery pack management system of the high-voltage storage battery pack, wherein the target digital signal is a digital signal corresponding to the weak voltage signal;
the high-voltage isolation unit is used for isolating and protecting a high-voltage side and a low-voltage side, wherein the high-voltage side is one side of the high-voltage isolation unit where the high-voltage storage battery pack is located, and the low-voltage side is the other side opposite to the high-voltage side;
the power supply processing unit is used for carrying out voltage stabilization processing on voltage input by an external power supply and stably supplying power to the equipment.
A second aspect provides a dc power calculation method applied to the dc power calculation apparatus according to any one of claims 1 to 6, the method including:
acquiring a weak voltage signal detected by a voltage detection unit;
performing signal conversion on the weak voltage signal to obtain a target digital signal, wherein the target digital signal is a digital signal corresponding to the weak voltage signal;
obtaining the target electric quantity of the high-voltage storage battery pack according to the target digital signal and a preset electric quantity algorithm;
and transmitting the target electric quantity to a main control unit of a storage battery pack management system of the high-voltage storage battery pack.
The embodiment of the invention has the following beneficial effects:
the invention provides a direct current electric quantity calculating device, which comprises: the device comprises a voltage detection unit, a data processing unit, a high-voltage isolation unit and a power supply processing unit; the output end of the voltage detection unit is electrically connected with the input end of the data processing unit, the output end of the data processing unit is electrically connected with the high-voltage side input end of the high-voltage isolation unit, the output end of the power supply processing unit is electrically connected with the low-voltage side input end of the high-voltage isolation unit, the voltage detection unit, the data processing unit, the high-voltage isolation unit and the power supply processing unit are integrated into a whole to form the direct current electric quantity calculation equipment, and the direct current electric quantity calculation equipment is connected with the high-voltage storage battery in series. The voltage detection unit, the data processing unit, the high-voltage isolation unit and the power supply processing unit are integrated into a direct current electric quantity calculation device which is electrically connected to the high-voltage storage battery pack, weak voltage signals generated by the voltage detection unit are processed into target digital signals by the data processing unit, target electric quantity calculation of the high-voltage storage battery pack is completed by adopting current integration, and then the target electric quantity is sent to a main control unit of a storage battery pack management system of the high-voltage storage battery pack, so that high-speed and high-precision current collection and electric quantity calculation functions are realized, and the main control unit of the storage battery pack management system can timely master the electric quantity state of the high-voltage storage battery pack; and the high-voltage isolation unit isolates the high-voltage side from the low-voltage safety side, the withstand voltage value of the high-voltage isolation unit can reach AC5000Vrms, the equipment safety and the personnel safety are further ensured, and the direct current electric quantity calculation equipment which is low in cost, high in stability and easy to use can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
fig. 1 is a schematic diagram of an application environment of a dc power calculating device according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a method for calculating dc power according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another application environment of a dc power calculating apparatus according to an embodiment of the present invention;
fig. 4 is another schematic flow chart illustrating a dc power calculating method according to an embodiment of the invention;
FIG. 5 is a diagram illustrating a function curve of a linear fitting function of preset temperature and resistance according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a block diagram of an application environment structure of a dc power calculating apparatus according to an embodiment of the present invention, and the dc power calculating apparatus 100 shown in fig. 1 includes: a voltage detection unit 102, a data processing unit 103, a high voltage isolation unit 104 and a power supply processing unit 105; the output end of the voltage detection unit 102 is electrically connected with the input end of the data processing unit 103, the output end of the data processing unit 103 is electrically connected with the high-voltage side input end of the high-voltage isolation unit 104, the output end of the power supply processing unit 105 is electrically connected with the low-voltage side input end of the high-voltage isolation unit 104, the voltage detection unit 102, the data processing unit 103, the high-voltage isolation unit 104 and the power supply processing unit 105 are integrated into a whole to form the direct current electric quantity calculation device 100, and the direct current electric quantity calculation device 100 is connected with the high-voltage storage battery pack 101 in series.
It should be noted that the high-voltage battery pack 101 is used for storing energy and is a calculation target of the dc power calculation apparatus 100, and the high-voltage battery pack 101 is an energy storage device composed of one or more battery packs and corresponding accessories, where the corresponding accessories include, but are not limited to, a battery pack management system, a high-voltage circuit, a low-voltage circuit, a thermal management system, a mechanical assembly, and the like, and the dc power calculation apparatus 100 is used for calculating the target power of the high-voltage battery pack 101 so as to well control the power condition of the high-voltage battery pack 101.
The storage battery management system is used for monitoring state information of the storage battery, such as electric quantity, total voltage, monomer voltage, total current, temperature, insulation resistance, charge state, power state and the like, providing communication, safety, cell balance and management control for the storage battery, and providing a system of a communication interface with application equipment.
The voltage detection unit 102 is configured to detect a weak voltage signal corresponding to a current at two ends of the high-voltage battery pack 101.
It should be noted that the voltage detection unit 102 includes, but is not limited to, a current sensor such as a current divider, and the dc power calculation device 100 is connected in series with the high-voltage battery pack 101, when the current in the high-voltage battery pack 101 changes, the current in the voltage detection unit 102 changes simultaneously to generate a voltage, and a weak voltage signal can be obtained according to ohm's law.
Illustratively, the resistance value of the resistor of the shunt is 100 μ Ω, and the sampling precision is 0.01A, so that the corresponding voltage is 1 μ V, so that the current detected by the shunt at two ends of the high-voltage battery pack 101 corresponds to a weak voltage signal.
The data processing unit 103 is configured to perform signal transformation on the weak voltage signal to obtain a target digital signal of the high-voltage battery pack 101 and a target electric quantity corresponding to the target digital signal, and transmit the target electric quantity to a main control unit of a battery pack management system of the high-voltage battery pack 101, where the target digital signal is a digital signal corresponding to the weak voltage signal.
In one possible implementation, the signal transformation includes, but is not limited to, signal acquisition, signal filtering, analog-to-digital conversion, and electric quantity calculation.
It can be understood that, after the target electric quantity is obtained, the target electric quantity signal can be transmitted to the main control unit of the storage battery management system of the high-voltage storage battery pack 101, so that the performance and the working parameters of the high-voltage storage battery pack 101 can be effectively managed in real time.
The high-voltage isolation unit 104 is used for isolating and protecting a high-voltage side and a low-voltage side, the high-voltage side is one side of the high-voltage isolation unit 104 where the high-voltage storage battery pack 101 is located, and the low-voltage side is the other side opposite to the high-voltage side.
It should be noted that the voltage range of the high-voltage battery pack is as high as 400-750V, and the current range of the current output is as high as ± 800A. Because the battery system has higher voltage and wide output current range, the total voltage of the battery system is up to 750V, and the battery system has harm to operators and low-voltage equipment, the high-voltage isolation unit 104 is arranged to realize isolation protection between high-voltage hazard measurement and low-voltage safety measurement, and the power utilization safety is ensured.
Illustratively, the high voltage isolation unit 104 includes, but is not limited to, isolation protection by electromagnetic isolation, wherein an insulation resistance greater than 20M Ω and a leakage current less than 2mA can be achieved to protect safety of personnel and equipment.
The power supply processing unit 105 is configured to perform voltage stabilization processing on a voltage input by an external power supply and stably supply power to the direct-current power amount calculation apparatus 100.
Illustratively, the external power supply adopts a wide voltage of 32V, and the power supply processing unit 105 is used to step down the input wide voltage to a stable 5V for supplying power to the direct current computing device, so as to ensure the safety and stability of power utilization.
The invention provides a direct current electric quantity calculating device, which comprises: the device comprises a voltage detection unit, a data processing unit, a high-voltage isolation unit and a power supply processing unit; the output end of the voltage detection unit is electrically connected with the input end of the data processing unit, the output end of the data processing unit is electrically connected with the high-voltage side input end of the high-voltage isolation unit, the output end of the power supply processing unit is electrically connected with the low-voltage side input end of the high-voltage isolation unit, the voltage detection unit, the data processing unit, the high-voltage isolation unit and the power supply processing unit are integrated into a whole to form the direct current electric quantity calculation equipment, and the direct current electric quantity calculation equipment is connected with the high-voltage storage battery in series. The voltage detection unit, the data processing unit, the high-voltage isolation unit and the power supply processing unit are integrated into a direct current electric quantity calculation device which is electrically connected to the high-voltage storage battery pack, weak voltage signals generated by the voltage detection unit are processed into target digital signals by the data processing unit, target electric quantity calculation of the high-voltage storage battery pack is completed by adopting current integration, and then the target electric quantity is sent to a main control unit of a storage battery pack management system of the high-voltage storage battery pack, so that high-speed and high-precision current collection and electric quantity calculation functions are realized, and the main control unit of the storage battery pack management system can timely master the electric quantity state of the high-voltage storage battery pack; and the high-voltage isolation unit isolates the high-voltage side from the low-voltage safety side, the withstand voltage value of the high-voltage isolation unit can reach AC5000Vrms, the safety and the personnel safety of the direct current electric quantity computing equipment are further ensured, and the direct current electric quantity computing equipment which is low in cost, high in stability and easy to use can be realized.
Referring to fig. 2, fig. 2 is a method for calculating dc power according to an embodiment of the present invention, where the method shown in fig. 2 is applied to the dc power calculating apparatus shown in fig. 1, and the method includes:
201. acquiring a weak voltage signal detected by a voltage detection unit;
the weak voltage signal is a weak voltage signal corresponding to the current at the two ends of the high-voltage storage battery pack 101.
It can be understood that the voltage detection unit 102 is connected in series with the high-voltage battery pack 101, and a change in current in the high-voltage battery pack 101 will cause a change in current in the voltage detection unit 102 at the same time, so that the current can be converted into a weak voltage signal according to ohm's law.
202. Performing signal conversion on the weak voltage signal to obtain a target digital signal, wherein the target digital signal is a digital signal corresponding to the weak voltage signal;
it should be noted that the signal conversion includes, but is not limited to, signal acquisition, signal filtering, analog-to-digital conversion, and signal conversion modes such as electric quantity calculation.
203. Obtaining the target electric quantity of the high-voltage storage battery pack according to the target digital signal and a preset electric quantity algorithm;
in a feasible implementation manner, the preset electric quantity algorithm may be to solve a target current corresponding to the target digital signal by using ohm's law, and then perform current integral calculation on the target current for a time corresponding to the current, so as to solve the target electric quantity of the high-voltage storage battery.
204. And transmitting the target electric quantity to a main control unit of a storage battery pack management system of the high-voltage storage battery pack.
In a feasible implementation manner, the target electric quantity obtained by integration is transmitted to a main control unit of a storage battery management system of the high-voltage storage battery pack, and the main control unit is used for indicating the working state of the high-voltage storage battery pack, so that the main control unit can manage the high-voltage storage battery pack according to the indication.
The invention provides a direct current electric quantity calculation method, which is applied to direct current electric quantity calculation equipment and comprises the following steps: acquiring a weak voltage signal detected by a voltage detection unit; performing signal conversion on the weak voltage signal to obtain a target digital signal, wherein the target digital signal is a digital signal corresponding to the weak voltage signal; obtaining the target electric quantity of the high-voltage storage battery pack according to the target digital signal and a preset electric quantity algorithm; and transmitting the target electric quantity to a main control unit of a storage battery pack management system of the high-voltage storage battery pack. The weak voltage signal generated by the voltage detection unit is processed into a target digital signal, the target electric quantity calculation of the high-voltage storage battery pack is completed by adopting a preset electric quantity algorithm, and then the target electric quantity is sent to the main control unit of the storage battery pack management system of the high-voltage storage battery pack, so that the high-speed and high-precision current acquisition and electric quantity calculation functions are realized, and the main control unit of the storage battery pack management system can timely master the electric quantity state of the high-voltage storage battery pack.
For example, a dc power calculating device in the embodiment of the present invention is described by taking a high-voltage battery pack suitable for a shield machine excavation system, which is commonly used for tunnel excavation, such as underground traffic, underground shopping mall, and the like. The shield machine excavation system further comprises a tunnel horizontal transportation electric locomotive, and the tunnel horizontal transportation electric locomotive is used for transporting construction materials such as duct pieces, mortar and the like to the interior of the tunnel from a wellhead. And the storage battery system provides electric energy for the tunnel horizontal transport electric locomotive to drive the tunnel horizontal transport electric locomotive to walk.
Referring to fig. 3, fig. 3 is a schematic diagram of another application environment of a dc power calculating apparatus according to an embodiment of the present invention, and the dc power calculating apparatus 300 shown in fig. 3 includes: a voltage detection unit 302, a data processing unit 303, a high voltage isolation unit 304, a power processing unit 305 and a communication unit 306; the output end of the voltage detection unit 302 is electrically connected to the input end of the data processing unit 303, the output end of the data processing unit 303 is electrically connected to the high-voltage side input end of the high-voltage isolation unit 304, the output end of the power processing unit 305 is electrically connected to the low-voltage side input end of the high-voltage isolation unit 304, the communication unit 306 is connected to the low-voltage side of the high-voltage isolation unit 304, the voltage detection unit 302, the data processing unit 303, the high-voltage isolation unit 304, the power processing unit 305 and the communication unit 306 are integrated into the dc power calculating apparatus 300, and the dc power calculating apparatus 300 is connected to the high-voltage battery pack 301 in series.
It is understood that, part of the contents of the voltage detection unit 302, the data processing unit 303, the high voltage isolation unit 304, and the power supply processing unit 305 in the high voltage battery pack 301 and the dc power calculating device 300 shown in fig. 3 are similar to the descriptions of the voltage detection unit 102, the data processing unit 103, the high voltage isolation unit 104, and the power supply processing unit 105 in the high voltage battery pack 101 and the dc power calculating device 100 shown in fig. 1, and therefore, no further description is provided herein to avoid repetition.
In one possible implementation, the data processing unit 303 includes: the micro-control module and the differential filter circuit are connected; the input end of the differential filter circuit is electrically connected with the output end of the voltage detection unit 302, and the output end of the differential filter circuit is electrically connected with the input end of the micro control module;
the differential filter circuit is used for filtering the weak voltage signal to obtain a filtered voltage signal;
in a feasible implementation manner, the weak voltage signal is subjected to signal conversion processing by using a differential filter circuit, wherein the differential filter circuit may be an RC low-pass filter circuit, the weak voltage signal detected by the voltage detection unit 302 is subjected to filtering processing by using the RC low-pass filter circuit to obtain a filtered voltage signal, and the filtered voltage signal is transmitted to the micro control module to continue signal conversion.
The micro control module is used for collecting the filtering voltage signal by a preset collecting mechanism to obtain the target digital signal and the target electric quantity corresponding to the target digital signal.
It should be noted that the micro control module further performs signal conversion on the obtained filtered voltage signal, obtains a target electric quantity through signal acquisition, analog-to-digital conversion, electric quantity calculation and the like, and transmits the target electric quantity to a main control unit of the storage battery management system.
In a feasible implementation manner, the micro-control module includes a micro-control chip, a fully differential analog-to-digital conversion circuit, and a preset number of thermistors; the input end of the fully differential digital-to-analog conversion circuit is electrically connected with the output end of the differential filter circuit, the output end of the fully differential digital-to-analog conversion circuit is electrically connected with the micro control chip, and the thermistor is electrically connected with the micro control chip;
the thermistor is used for detecting the ambient temperature and transmitting the ambient temperature to the micro control chip.
It should be noted that the ambient temperature detected by the thermistor is used to instruct the micro-control chip to obtain the resistance value of the voltage detection unit 302 for calculating the target electric quantity.
Illustratively, the thermistor may be an NTC (negative Temperature coefficient) which refers to a thermistor phenomenon and material having a negative Temperature coefficient in which the resistance decreases exponentially with the Temperature rise, wherein the number of NTCs includes, but is not limited to, 4, and each is electrically connected to the micro control chip.
The fully differential analog-to-digital conversion circuit is used for collecting the filtering voltage signal by a preset collection mechanism to obtain the target digital signal and transmitting the target digital signal to the micro control chip.
The fully differential analog-to-digital conversion circuit collects and converts a target voltage signal, namely a filtering voltage signal, input through the differential filter circuit into a target digital signal.
The preset acquisition mechanism comprises acquisition frequency, acquisition times of each acquisition period and cycle times of the period, wherein the acquisition frequency can be T, the acquisition times of each acquisition period are N, and the cycle times of the period are M.
For example, the acquisition frequency T may be 1 ms/time, the number of acquisitions N per acquisition period is 10, and the number of cycles of the period is 10.
Performing trapezoidal filtering on the 10 filtering voltage signals every time an acquisition cycle is executed to obtain 10 filtering digital signals, and caching each filtering digital signal; and when the acquisition period reaches 10 periodic cycle times, performing secondary filtering on the 10 × 10 filtered digital signals to smooth data to obtain a target digital signal.
The micro control chip is configured to receive the environment temperature and the target digital signal, obtain the target electric quantity according to the environment temperature, the target digital signal and a preset electric quantity algorithm, and transmit the target electric quantity to a main control unit of a storage battery management system of the high-voltage storage battery 301.
In one possible implementation, the preset electrical quantity algorithm includes, but is not limited to, ohm's law, a linear fitting function of temperature and resistance, and current integration.
In the embodiment of the present invention, the high voltage isolation unit 304 is an isolated DC-DC converter with an integrated model of IsoPower and model of Adum6201, and when the power processing unit 305 inputs a 5.0V power, it can provide a regulated isolation power of 400mW to power the data processing circuit. The premium 6201 also integrates two paths of digital isolators to provide channels for digital signal transmission. The isolation voltage of the Adum6201 is 5000Vrms, and the requirement of strengthening insulation under the voltage class of an electric locomotive is met (according to the standard GB/T18384.3-20157.3.3.3.2).
In this embodiment of the present invention, the power supply processing unit 305 includes: the circuit comprises an anti-reverse connection circuit, a transient suppression circuit, a filter circuit, an ultra-low electromagnetic interference circuit and a switching regulator; wide voltage input by an external power supply is input to the switching regulator through the anti-reverse connection circuit, the transient suppression circuit, the filter circuit and the ultra-low electromagnetic interference circuit; the switching regulator is used for performing voltage reduction processing on the wide voltage input by the external power supply and supplying power to the direct current electric quantity calculation device 300.
Illustratively, the switching regulator is selected from a model LT8619, the model LT8619 is a compact, high-efficiency, high-speed, synchronous, single-chip and buck switching regulator, output ripples are lower than 10mVp-p, and the switching regulator can well supply power to other circuits.
The communication unit 306 includes, but is not limited to, a Controller Area Network (CAN) bus, and provides a data transmission channel for the dc computing device and a corresponding terminal establishing communication by using a data communication protocol.
In one possible implementation, the communication unit 306 includes a CAN transceiver having a filter circuit and a transient suppression circuit, and the target power is transmitted to the CAN bus through the filter circuit and the transient suppression circuit. The CAN transceiver type number CAN be NXP TJA1042, and the TJA1042 CAN provide differential transmission driving capability and differential driving receiving capability for bus signals for a high-speed CAN transceiver conforming to ISO11898 standard; the filter circuit adopts a common mode filter special for TDK, the transient suppression circuit adopts TVS special for Littelfuse, the parasitic capacitance is small, the response is fast, the power peak value is large, and the data transmission is stable and is not distorted.
In this embodiment of the present invention, the dc power calculating device 300 further includes: and the upper computer management unit.
The upper computer management unit is used for debugging, calibrating and analyzing the performance parameters of the high-voltage storage battery pack 301 and the performance parameters of the direct-current computing equipment.
The invention provides a direct current electric quantity calculating device, which comprises: the device comprises a voltage detection unit, a data processing unit, a high-voltage isolation unit, a power supply processing unit and a communication unit; the output end of the voltage detection unit is electrically connected with the input end of the data processing unit, the output end of the data processing unit is electrically connected with the high-voltage side input end of the high-voltage isolation unit, the output end of the power supply processing unit is electrically connected with the low-voltage side input end of the high-voltage isolation unit, the communication unit is connected to the low-voltage side of the high-voltage isolation unit, the voltage detection unit, the data processing unit, the high-voltage isolation unit, the power supply processing unit and the communication unit are integrated into a whole to form the equipment, and the direct current electric quantity calculation equipment is connected with the high-voltage storage battery in series. The voltage detection unit, the data processing unit, the high-voltage isolation unit, the power supply processing unit and the communication unit are integrated into a whole to form direct current electric quantity calculation equipment which is electrically connected to the high-voltage storage battery pack, weak voltage signals generated by the voltage detection unit are processed into target digital signals by the data processing unit, target electric quantity calculation of the high-voltage storage battery pack is completed by adopting current integration, and then the target electric quantity is sent to a main control unit of a storage battery pack management system of the high-voltage storage battery pack, so that high-speed and high-precision current collection and electric quantity calculation functions are realized, and the main control unit of the storage battery pack management system can timely master the electric quantity state of the high-voltage storage battery pack; and the high-voltage isolation unit isolates the high-voltage side from the low-voltage safety side, the withstand voltage value of the high-voltage isolation unit can reach AC5000Vrms, the equipment safety and the personnel safety are further ensured, the direct current electric quantity computing equipment which is low in cost, high in stability and easy to use can be realized, data interaction can be carried out on the communication unit and the upper computer management unit, and the performance parameters of the high-voltage storage battery pack are debugged, calibrated and analyzed.
Referring to fig. 4, fig. 4 is another schematic flow chart of a method for calculating dc power according to an embodiment of the present invention, where the method shown in fig. 4 includes:
401. acquiring a weak voltage signal detected by the voltage detection unit 302;
402. filtering the weak voltage signal by using a differential filter circuit to obtain a filtered voltage signal;
403. performing signal acquisition of preset cycle times M on the filtering voltage signals by using a fully differential analog-to-digital conversion circuit in an acquisition period with preset acquisition frequency T and preset acquisition times N to obtain M groups of acquisition signals, wherein the M groups of acquisition signals comprise N filtering voltage signals;
404. performing trapezoidal filtering on each group of the collected signals respectively to obtain N × M filtered digital signals;
405. performing secondary filtering on the N-M filtered digital signals to obtain target digital signals;
for example, the acquisition frequency T may be 1 ms/time, the acquisition frequency N of each acquisition period is 10, the cycle frequency of the period is 10, and trapezoidal filtering is performed on 10 filtered voltage signals every time an acquisition period is executed, so as to obtain 10 filtered digital signals, and each filtered digital signal is cached; and when the acquisition period reaches 10 periodic cycle times, performing secondary filtering on the 10 × 10 filtered digital signals, wherein the secondary filtering may be running water filtering to smooth the data to obtain a target digital signal.
406. Obtaining the target electric quantity of the high-voltage storage battery pack 301 according to the target digital signal and a preset electric quantity algorithm;
in this embodiment of the present invention, step 406 specifically includes:
i. acquiring a resistance value of the voltage detection unit 302;
wherein, step i also includes before: acquiring the ambient temperature detected by the thermistor; and determining the resistance value of the voltage detection unit 302 by using the environment temperature and a linear fitting function of the preset temperature and the resistance value.
Referring to fig. 5, fig. 5 is a graph illustrating a function curve of a linear fitting function of preset temperature and resistance according to an embodiment of the present invention, wherein the resistance of the shunt is 100 μ Ω, and the linear fitting function of the preset temperature and resistance is as follows:
y＝1×10-6x3+8×10-6x2+0.002x+0.9879
where y represents the shunt resistance and x represents the ambient temperature sensed by the thermistor.
ii. Determining a target current by using the target digital signal, the resistance value of the voltage detection unit 302 and ohm's law;
and iii, performing integral calculation on the target current and time to obtain the target electric quantity of the high-voltage storage battery pack 301.
It is understood that the charge Q is ixt, where I is the target current and t is time.
Illustratively, the integral calculation adopts trapezoidal integration, the period is 10ms, and the trapezoidal integration is carried out on the current and the time to obtain the target electric quantity.
407. And transmitting the target electric quantity to a main control unit of a storage battery management system of the high-voltage storage battery pack 301.
In one possible implementation, the target electric quantity is transmitted to a main control end element of the storage battery management system through a data communication protocol of a vehicle local Area Network (CAN) communication data bus.
The invention provides a direct current electric quantity calculation method, which is applied to direct current electric quantity calculation equipment and comprises the following steps: acquiring a weak voltage signal detected by a voltage detection unit; performing signal conversion on the weak voltage signal to obtain a target digital signal, wherein the target digital signal is a digital signal corresponding to the weak voltage signal; obtaining the target electric quantity of the high-voltage storage battery pack according to the target digital signal and a preset electric quantity algorithm; and transmitting the target electric quantity to a main control unit of a storage battery pack management system of the high-voltage storage battery pack. The weak voltage signal generated by the voltage detection unit is processed into a target digital signal, the target electric quantity calculation of the high-voltage storage battery pack is completed by adopting a preset electric quantity algorithm, and then the target electric quantity is sent to the main control unit of the storage battery pack management system of the high-voltage storage battery pack, so that the high-speed and high-precision current acquisition and electric quantity calculation functions are realized, and the main control unit of the storage battery pack management system can timely master the electric quantity state of the high-voltage storage battery pack.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A direct current electric quantity calculation apparatus, characterized in that the apparatus comprises: the device comprises a voltage detection unit, a data processing unit, a high-voltage isolation unit and a power supply processing unit; the output end of the voltage detection unit is electrically connected with the input end of the data processing unit, the output end of the data processing unit is electrically connected with the high-voltage side input end of the high-voltage isolation unit, the output end of the power supply processing unit is electrically connected with the low-voltage side input end of the high-voltage isolation unit, the voltage detection unit, the data processing unit, the high-voltage isolation unit and the power supply processing unit are integrated into a whole to form the equipment, and the equipment is connected with a high-voltage storage battery pack in series;
the high-voltage storage battery pack is used for storing energy and is a calculation target of the direct current electric quantity calculation equipment;
the voltage detection unit is used for detecting weak voltage signals corresponding to the currents at the two ends of the high-voltage storage battery pack;
the data processing unit is used for performing signal transformation on the weak voltage signal to obtain a target digital signal of the high-voltage storage battery pack and a target electric quantity corresponding to the target digital signal, and transmitting the target electric quantity to a main control unit of a storage battery pack management system of the high-voltage storage battery pack, wherein the target digital signal is a digital signal corresponding to the weak voltage signal;
the high-voltage isolation unit is used for isolating and protecting a high-voltage side and a low-voltage side, wherein the high-voltage side is one side of the high-voltage isolation unit where the high-voltage storage battery pack is located, and the low-voltage side is the other side opposite to the high-voltage side;
the power supply processing unit is used for carrying out voltage stabilization processing on voltage input by an external power supply and stably supplying power to the equipment.
2. The apparatus according to claim 1, wherein the data processing unit includes: the micro-control module and the differential filter circuit are connected; the input end of the differential filter circuit is electrically connected with the output end of the voltage detection unit, and the output end of the differential filter circuit is electrically connected with the input end of the micro control module;
the differential filter circuit is used for filtering the weak voltage signal to obtain a filtered voltage signal;
the micro control module is used for collecting the filtering voltage signal by a preset collecting mechanism to obtain the target digital signal and the target electric quantity corresponding to the target digital signal.
3. The direct current electric quantity calculation device according to claim 2, wherein the micro control module further comprises a micro control chip, a fully differential analog-to-digital conversion circuit and a preset number of thermistors; the input end of the fully differential digital-to-analog conversion circuit is electrically connected with the output end of the differential filter circuit, the output end of the fully differential digital-to-analog conversion circuit is electrically connected with the micro control chip, and the thermistor is electrically connected with the micro control chip;
the thermistor is used for detecting the ambient temperature and transmitting the ambient temperature to the micro control chip;
the fully differential digital-to-analog conversion circuit is used for acquiring the filtering voltage signal by a preset acquisition mechanism to obtain the target digital signal and transmitting the target digital signal to the micro control chip;
the micro control chip is used for receiving the environment temperature and the target digital signal, obtaining the target electric quantity according to the environment temperature, the target digital signal and a preset electric quantity algorithm, and transmitting the target electric quantity to a main control unit of a storage battery management system of the high-voltage storage battery.
4. The dc power calculating apparatus according to claim 1, wherein the power processing unit includes: the circuit comprises an anti-reverse connection circuit, a transient suppression circuit, a filter circuit, an ultra-low electromagnetic interference circuit and a switching regulator;
wide voltage input by the external power supply is input to the switching regulator through the anti-reverse connection circuit, the transient suppression circuit, the filter circuit and the ultra-low electromagnetic interference circuit;
the switching regulator is used for carrying out voltage reduction processing on wide voltage input by the external power supply and supplying power for the direct current electric quantity computing equipment.
5. The dc power calculating apparatus according to claim 1, further comprising: the communication unit is connected to the low-voltage side of the high-voltage isolation unit;
the communication unit is used for performing data interaction between the data processing unit and a main control unit of a storage battery pack management system of the high-voltage storage battery pack to provide a transmission channel.
6. The dc power calculating apparatus according to claim 1, further comprising: an upper computer management unit;
and the upper computer management unit is used for debugging, calibrating and analyzing the performance parameters of the high-voltage storage battery pack.
7. A direct current electric quantity calculation method applied to the direct current electric quantity calculation apparatus according to any one of claims 1 to 6, the method comprising:
acquiring a weak voltage signal detected by a voltage detection unit;
performing signal conversion on the weak voltage signal to obtain a target digital signal, wherein the target digital signal is a digital signal corresponding to the weak voltage signal;
obtaining the target electric quantity of the high-voltage storage battery pack according to the target digital signal and a preset electric quantity algorithm;
and transmitting the target electric quantity to a main control unit of a storage battery pack management system of the high-voltage storage battery pack.
8. The method of claim 7, wherein said performing signal transformation on the weak voltage signal to obtain a target digital signal comprises:
filtering the weak voltage signal by using a differential filter circuit to obtain a filtered voltage signal;
performing signal acquisition of preset cycle times M on the filtering voltage signals by using a fully differential analog-to-digital conversion circuit in an acquisition period with preset acquisition frequency T and preset acquisition times N to obtain M groups of acquisition signals, wherein the M groups of acquisition signals comprise N filtering voltage signals;
performing trapezoidal filtering on each group of the collected signals respectively to obtain N × M filtered digital signals;
and carrying out secondary filtering on the N-M filtered digital signals to obtain target digital signals.
9. The method of claim 7, wherein obtaining the target charge of the high-voltage battery pack according to the target digital signal and a preset charge algorithm comprises:
acquiring a resistance value of the voltage detection unit;
determining a target current by using the target digital signal, the resistance value of the voltage detection unit and the ohm's law;
and performing integral calculation on the target current and time to obtain the target electric quantity of the high-voltage storage battery pack.
10. The method of claim 9, wherein the obtaining the resistance value of the voltage detection unit further comprises:
acquiring the ambient temperature detected by the thermistor;
and determining the resistance value of the voltage detection unit by utilizing the environment temperature and a linear fitting function of the preset temperature and the resistance value.
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| CN113884758A (en) * | 2021-09-29 | 2022-01-04 | 广东电网有限责任公司 | Direct current electric energy metering method, device, equipment and storage medium |
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