DC-DC converter, battery system, verification method and medium
By calculating the output current as a reference value to verify the output current sensor, the safety hazards caused by sensor failure are solved, cost and space requirements are reduced, and the safety and reliability of the battery system are improved.
Patent Information
- Application Number
- CN202311236484.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-22
- Publication Date
- 2025-03-25
AI Technical Summary
In electric vehicles, sensor failures can lead to loss of control of the battery system, which in turn creates safety risks. The prior art requires redundant sensors to be installed to achieve verification, but this increases cost and space requirements.
The output current sensor is verified by calculating the output current as a reference value, and the input voltage, input current and output voltage are used for calculation, avoiding dependence on redundant sensors.
Reduces cost and space requirements, improves the safety and reliability of the battery system, and simplifies the sensor verification process.
Smart Images
Figure CN119696295A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of fuel cells, and more particularly, to methods and media for determining a DC-DC converter, a battery system, and a calibration method. Background Art
[0002] As electric vehicles become more popular, the complexity of the entire vehicle's electrical and electronic systems continues to increase, and functional safety is becoming a mainstream requirement. The Automotive Safety Integrity Level (ASIL) represents the level of automotive safety, such as the ISO 26262 standard. This is a risk classification system defined for the functional safety of road vehicles, for example. The standard defines functional safety as "the absence of unreasonable risks caused by hazards related to the faulty behavior of electrical and electronic systems." ASIL establishes safety requirements in accordance with the ISO 26262 standard based on the probability and tolerance of hazards to automotive components.
[0003] In order to achieve a higher safety integrity level, electric vehicles are equipped with a variety of sensors for monitoring the operating conditions of electronic and electrical components. However, once a sensor fails, the erroneous information collected by the sensor may cause the corresponding device to lose control and create danger. Summary of the invention
[0004] The embodiment of the present disclosure proposes a scheme for verifying a current sensor in a DC-DC converter. In a first aspect of the present disclosure, a DC-DC converter is provided, which is suitable for being coupled between a power supply and a driving battery, and the DC converter includes: a conversion circuit configured to convert direct current input from the power supply to the driving battery; an input voltage sensor configured to detect an input voltage input to the conversion circuit; an input current sensor configured to detect an input current input to the conversion circuit; an output voltage sensor configured to detect an output voltage output to the driving battery; an output current sensor configured to detect an output current output to the driving battery; and a controller configured to: calculate an output current based on an input voltage, an input current, and an output voltage; and verify the output current sensor based on the calculated output current and the detected output current.
[0005] According to a second aspect of the present disclosure, a battery system is provided, comprising: a power supply configured to output direct current; a drive battery configured to supply power to components in a vehicle; and a DC-DC converter according to the first aspect of the present disclosure, which is coupled between the power supply and the drive battery and is configured to convert direct current input from the power supply to the drive battery.
[0006] According to a third aspect of the present disclosure, a method for verifying a current sensor of a DC-DC converter is provided. The verification scheme includes: obtaining an input voltage detected by an input voltage sensor and input to a conversion circuit of a DC-DC converter, the DC-DC converter being coupled between a power supply and a driving battery, and a conversion circuit configured to convert direct current input from the power supply to the driving battery; obtaining an input current detected by an input current sensor and input to the conversion circuit; obtaining an output voltage detected by an output voltage sensor and output to the driving battery; obtaining an output current detected by an output current sensor and output to the driving battery; calculating an output current based on the input voltage, the input current, and the output voltage; and verifying the output current sensor based on the calculated output current and the detected output current.
[0007] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided. The computer-readable storage medium stores computer-executable instructions. Here, the computer-executable instructions are executed by a processor to implement the method according to the third aspect of the present disclosure.
[0008] It should be understood that the contents described in the Summary of the Invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:
[0010] Figure 1 shows a schematic diagram of a battery system according to some embodiments of the present disclosure;
[0011] Figure 2 A schematic diagram of a sensor calibration system according to some embodiments of the present disclosure is shown;
[0012] Figures 3A-3D A flowchart illustrating an example method for sensor calibration according to some embodiments of the present disclosure is shown;
[0013] Figure 4 A schematic diagram showing an example process of calculating output current according to some embodiments of the present disclosure; and
[0014] Figure 5 A block diagram of a device in which various embodiments of the present disclosure may be implemented is shown. DETAILED DESCRIPTION
[0015] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.
[0016] In the description of the embodiments of the present disclosure, the term "including" and similar terms should be understood as open inclusion, that is, "including but not limited to". The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.
[0017] As discussed above, in order to improve the safety of the battery system, it is necessary to monitor and verify the sensors of the DC-DC converter, which is an important component in the battery system. Among them, the verification of the output current sensor in the DC-DC converter in the power supply is particularly important. For this reason, it is necessary to set a reliability verification mechanism for the output current sensor in the DC-DC converter.
[0018] Conventionally, redundant sensors can be set to collect redundant signals, and reliability verification can be performed by comparing the redundant signals collected by the redundant sensors with the detected signals as reference signals. For example, at the output end of the DC-DC converter, a current sensor is provided to detect the current input to the downstream drive battery. In order to meet safety standards, another redundant current sensor can be provided to detect the current value at the same position. Afterwards, the reading of the current sensor is verified to be normal by comparing the two current values detected by the two current sensors respectively.
[0019] However, in conventional solutions, it may be necessary to set corresponding electrical components for redundant sensors to ensure the correct operation of the redundant sensors, thereby increasing the overall cost. At the same time, the size of the DC-DC converter is increased due to the setting of additional sensors and corresponding circuits. This increases the difficulty of design and manufacturing for use scenarios with compact space.
[0020] In view of this, an embodiment of the present disclosure proposes a scheme for performing sensor calibration using the calculated output current as a reference value. In this scheme, when calibrating a sensor for detecting the current output to a driving battery, a reference value for calibration can be derived by obtaining the detected input current, input voltage, and output voltage from the converter to the driving battery, and then the measured value of the specific sensor can be verified based on the derived reference value. The reference value calculated using other measured values can replace the reference value detected by the redundant sensor specifically set for input current sensor calibration, thereby eliminating the redundant sensor. In this way, costs can be reduced and space requirements in the converter can be reduced.
[0021] Figure 1 Schematic diagram of a battery system according to some embodiments of the present disclosure is shown. Figure 1 As shown, the battery system includes a power supply 10. The power supply 10 may include a variety of power sources capable of providing electrical energy to the drive battery, such as a lithium battery (e.g., a lithium iron phosphate battery, a ternary lithium battery, etc.), a nickel-hydrogen battery, or a fuel cell, etc. In some embodiments, the power supply 10 may be a fuel cell stack. For example, the power supply 10 may be a proton exchange membrane fuel cell stack. The battery system also includes a drive battery 20. The drive battery 20 may be, for example, an energy storage battery, and supplies power to various components in an electric vehicle. In order to match the direct current generated by the power supply 10 with the drive battery 20, a DC-DC converter 100 is provided between the power supply 10 and the drive battery 20 to adjust the voltage of the direct current input from the power supply 10 to the drive battery 20.
[0022] exist Figure 1 In the illustrated embodiment, the DC-DC converter 100 includes a conversion circuit 110. The conversion circuit 110 is capable of converting the voltage of the direct current input from the power source 10 to the driving battery 20. For example, the conversion circuit 110 can increase or decrease the voltage of the direct current output by the power source 10 according to the application scenario and actual needs. The DC-DC converter 100 includes a variety of sensors for detecting its operating status.
[0023] On the input side of the DC-DC converter 100, an input voltage sensor 120 is provided to detect the input voltage input to the input terminal of the conversion circuit 110, and an input current sensor 130 is provided to detect the input current input to the conversion circuit 110. The input voltage sensor 120 is connected in parallel in the line connecting the power supply 10 and the conversion circuit 110. The input current sensor 130 is connected in series in the line connecting the power supply 10 to the conversion circuit 110.
[0024] Correspondingly, an output voltage sensor 140 is provided on the output side of the conversion circuit 110 to detect the output voltage output from the conversion circuit 110 to the drive battery 20, and an output current sensor 150 is provided to detect the output current output from the conversion circuit 110 to the drive battery 20. The output voltage sensor 140 is connected in parallel in the line connecting the conversion circuit 110 and the drive battery 20. The input current sensor 130 is connected in series in the line connecting the conversion circuit 110 and the drive battery 20.
[0025] In addition, the DC-DC converter 100 further includes a controller 160. The controller 160 is coupled to the electrical devices in the DC-DC converter 100 and is configured to obtain information from other electrical devices, analyze the obtained information and generate a signal indicating the analysis result.
[0026] like Figure 1 As shown, the controller 160 is coupled to the input voltage sensor 120, the input current sensor 130, the output voltage sensor 140, and the output current sensor 150, and can receive the detected input voltage from the input voltage sensor 120, the detected input current from the input current sensor 130, the detected output voltage from the output voltage sensor 140, and the detected output current from the output current sensor 150. Any one of the input voltage sensor 120, the input current sensor 130, the output voltage sensor 140, and the output current sensor 150 can form a sensing system with the controller 160. Figure 2 To describe the structure and principle of the sensing system in detail.
[0027] Figure 2 Schematic diagram of a sensing system 200 according to some embodiments of the present disclosure is shown. Figure 2 As shown, the sensing system 200 includes a sensing device 210 for sensing physical parameters and a controller 220 for analyzing the physical parameters. In some embodiments, the sensing device 210 may correspond to Figure 1 The sensing device 210 includes an input voltage sensor 120, an input current sensor 130, an output voltage sensor 140 or an output current sensor 150. The sensing device 210 includes a sensor 211. The sensor 211 is coupled in the circuit to be detected and detects the voltage or current in the circuit. The sensing device 210 also includes a sampling circuit 212 and an analog-to-digital converter 213. The sampling circuit 212 samples the analog signal received from the sensor 211 and inputs the sampled signal to the analog-to-digital converter 213. Thereafter, the sampled signal is quantized to generate a digital signal 214 representing the detected physical quantity. Finally, the analog-to-digital converted digital signal 214 is input to the controller 220.
[0028] The controller 220 may perform a variety of checks on the digital signal 214. For example, the controller 220 may first perform a valid range check 230 on the digital signal 214 to check whether the digital signal 214 is within a predetermined valid range. If the controller 220 determines that the digital signal 214 is within the predetermined valid range, then the valid range check 230 passes. Thereafter, the controller 220 performs a rationality check 250 on the digital signal 214. When performing the rationality check 250, the controller 220 compares the digital signal 214 with the reference signal 240 to determine whether the detected digital signal 214 is reasonable. For example, the digital signal 214 and the reference signal 240 may match, indicating that the detected digital signal 214 is reasonable. In this way, it can be determined that the sensor is normal.
[0029] Figure 3A FIG. 3 is a flow chart showing an example method 300 for sensor calibration according to some embodiments of the present disclosure. Figure 1 The method 300 is described in the environment shown in FIG. The method 300 may be performed by, for example Figure 1 The DC-DC converter 100 in FIG.
[0030] like Figure 3A As shown, at 310, the DC-DC converter 100 obtains calibration parameters associated with sensor calibration. In some embodiments, the calibration parameters may include a current matching threshold for rationality calibration and an overcurrent threshold for overcurrent detection.
[0031] At 320, the DC-DC converter 100 performs a rationality check. In some embodiments, the DC-DC converter 100 can perform a rationality check for any sensor in the DC-DC converter 100. For example, the DC-DC converter 100 can obtain a reference value for a specific sensor and compare the reference value with the measured value. In some embodiments, the reference value can be a fixed value obtained through experience or a set of values corresponding to the operating state. In some embodiments, the reference value can be calculated from the detection values at other locations through the corresponding physical constraints.
[0032] If the reference value matches the measured value, the DC-DC converter 100 can determine that the particular sensor is operating normally and the reading is reasonable. Conversely, if the reference value does not match the measured value, the DC-DC converter 100 can determine that the particular sensor is operating abnormally and the reading is unreasonable. The method of rationality verification will be referred to later. Figure 3B Let me introduce it in detail.
[0033] If the DC-DC converter 100 determines that the sensor is operating abnormally, that is, the rationality check fails, then the method 300 proceeds to 340. At 340, the DC-DC converter 100 sends a request to enter a safe mode to avoid the harm caused by the sensor abnormality. Here, the safe mode may include shutdown, for example. In some embodiments, the DC-DC converter 100 may send a request to enter a safe mode to the master controller for the battery system. After the master controller confirms that the DC-DC converter 100 can enter the safe mode, a confirmation of entering the safe mode is sent to the DC-DC converter 100. After receiving the confirmation, the DC-DC converter 100 enters the safe mode. In some embodiments, the rationality check 320 can be performed at fixed time intervals. For example, the fixed time interval can be 20ms or 10ms.
[0034] If the sensor operates normally, that is, the rationality check is successful, then the method 300 proceeds to 330. At 330, the DC-DC converter 100 performs an overcurrent check on the sensor that passes the rationality check. When a sensor passes the rationality check, it means that the reading of the sensor is credible and can be used for other checks and analyses. At this time, the DC-DC converter 100 performs an overcurrent check on the sensor to determine whether the detection value of the sensor exceeds the limit threshold and causes harm to the equipment. Here, the DC-DC converter 100 can, for example, compare the detected current value with the obtained overcurrent threshold. If the detected current value is greater than the obtained overcurrent threshold, the overcurrent check fails. Conversely, if the detected current value is less than the obtained overcurrent threshold, the overcurrent check passes. The overcurrent check will be referred to later. Figure 3D Let me introduce it in detail.
[0035] If the DC-DC converter 100 determines that the overcurrent check fails, the method 300 proceeds to 340. At 340, the DC-DC converter 100 sends a request to enter the safe mode. If the sensor operates normally, that is, the rationality check passes, the method 300 proceeds to 350. At 350, the DC-DC converter 100 maintains the current operating state, that is, maintains normal operation.
[0036] Thus, through the progressive multi-level sensor verification, the operating status of the sensor can be fully monitored. In addition, after the rationality verification is passed, other verifications are performed to ensure the accuracy of other types of verifications.
[0037] Figure 3B FIG. 3 is a flow chart showing an example method 320 for rationality checking of a sensor according to some embodiments of the present disclosure. Figure 1 The method 320 is described in the environment shown in FIG. The method 320 may be performed by, for example Figure 1The DC-DC converter 100 in FIG. 1 is executed. For the purpose of brevity and without loss of generality, the output current sensor 150 is selected as the target sensor to be calibrated for discussion.
[0038] As discussed above, when performing a rationality check on a sensor, it is necessary to compare the measured value detected by the sensor with a reference value. Therefore, it is necessary to first obtain the reference value. In an embodiment of the present disclosure, the reference value is derived from the measured values of different sensors at other locations.
[0039] like Figure 3B As shown, at 321, the DC-DC converter obtains the input voltage input to the conversion circuit detected by the input voltage sensor. In some embodiments, the output end of the power supply is connected to the conversion circuit, and the voltage sensor for detecting the input voltage value can be connected in parallel in the line connecting the power supply to the conversion circuit. For example, the DC-DC converter 100 can obtain the input voltage detected by the input voltage sensor 120 connected in parallel in the line connecting the power supply 10 to the DC-DC converter 100.
[0040] At 322, the DC-DC converter obtains the input current DC-DC input to the conversion circuit detected by the input current sensor. In some embodiments, the output end of the power supply is connected to the conversion circuit, and the current sensor for detecting the input current value can be connected in series in the line connecting the power supply 10 to the conversion circuit. For example, the DC-DC converter 100 can obtain the input current detected by the input current sensor 130 connected in series in the line connecting the power supply 10 to the DC-DC converter 100.
[0041] At 323, the DC-DC converter obtains the output voltage output to the driving battery detected by the output voltage sensor. In some embodiments, the output terminal segment of the DC-DC converter is connected to the driving battery, and the output voltage sensor for detecting the output voltage output to the driving battery can be connected in parallel in the line where the conversion circuit is connected to the driving battery. In some embodiments, the DC-DC converter 100 can obtain the output voltage detected by the output voltage sensor 140 connected in parallel in the line where the DC-DC converter 100 is connected to the driving battery 20.
[0042] At 324, the DC-DC converter obtains the output current output to the driving battery detected by the output current sensor. In some embodiments, the output terminal segment of the DC-DC converter is connected to the driving battery, and the output current sensor for detecting the output current output to the driving battery can be connected in series in the line connecting the conversion circuit to the driving battery. In some embodiments, the DC-DC converter 100 can obtain the output current detected by the output current sensor 150 connected in series in the line connecting the DC-DC converter 100 to the driving battery 20.
[0043] In some embodiments, the input voltage sensor 120, the input current sensor 130, the output voltage sensor 140, and the output current sensor 150 may have Figure 2 The structure of the sensing arrangement 210 is shown. In such an embodiment, the analog signals detected by the input voltage sensor 120, the input current sensor 130, the output voltage sensor 140, and the output current sensor 150 can be converted into corresponding digital signals through sampling and analog-to-digital conversion, and then input into the controller 160. Thus, the measurement values required for deriving the reference value and the current measurement values to be verified are obtained.
[0044] At 325, the DC-DC converter calculates the output current DC-DC based on the input voltage, the input current, and the output voltage. In some embodiments, the controller 160 of the DC-DC converter 100 can calculate the output current based on the input voltage, the input current, and the output voltage. In some embodiments, the DC-DC converter 100 can derive the output current based on the relationship between the input power and the output power. For example, the input power may be lost when passing through the conversion circuit 110, and therefore cannot be 100% output to the drive battery 20. The following will refer to Figure 4 An example of the calculation process of the reference current value is described in detail.
[0045] Figure 4A schematic diagram of an example process 400 for calculating an output current according to some embodiments of the present disclosure is shown. The process 400 can be performed, for example, in the controller 160 of the DC-DC converter 100. A current calculation model 420 is stored in the controller 160. After the controller 160 acquires the detected input current 411, the input voltage 412, and the output voltage 414, the acquired measured values are input into the current calculation model 420. In the calculation model 420, the nominal input power is calculated based on the input voltage 412 and the input current 411, that is, the input voltage 412 and the input current 411. In the calculation model 420, a power efficiency lookup table 421 is provided. The power efficiency lookup table 421, for example, includes power efficiencies corresponding to various powers. The power efficiency can be previously determined, for example. Afterwards, according to the calculated nominal input power, the power efficiency 413 corresponding to the nominal input power is selected in the power efficiency lookup table 421. After obtaining the power efficiency 413 , the input current 411 is multiplied by the input voltage 412 and then multiplied by the power efficiency 413 , thereby calculating the actual power. The actual power is then divided by the output voltage to obtain a reference value 415 for the output current.
[0046] In such an embodiment, a power efficiency lookup table is used to store power efficiency information, so that power efficiency can be quickly found. In addition, the reference value is determined by the relationship between input power and output power, which can simplify the calculation difficulty. At the same time, due to the low complexity of the calculation, the overall robustness of the reference value calculation is improved.
[0047] In some embodiments, the power loss of the DC-DC converter can be very small. In such embodiments, when calculating the output current, power efficiency can be considered, and the threshold when determining whether the calculated current matches the measured current can be appropriately adjusted.
[0048] return Figure 3B , at 326, the DC-DC converter verifies the output current sensor based on the calculated output current and the detected output current. In some embodiments, the DC-DC converter 100 can verify the output current sensor 150 based on the calculated output current and the output current detected by the output current sensor 150. The DC-DC converter 100 may include different types of sensors arranged at other locations. In this verification process, an input current and an input voltage and an output current having a specific relationship can be selected to calculate a current reference value. In this way, the current reference value can be calculated in a simple and accurate manner. Afterwards, by comparing the calculated reference value with the detected output current, the rationality verification of the output current sensor can be completed without the need for additional detection devices or other complex reference value calculation methods, thereby eliminating the redundant sensors that are conventionally specifically set for verification.
[0049] The following will refer to Figure 3C , which shows a flow chart of an example method 326 for rationality checking of a sensor according to some embodiments of the present disclosure. For the purpose of discussion, the following will be combined with Figure 1 The method 326 is described in the environment shown in FIG. The method 326 can be performed by, for example Figure 1 The DC-DC converter 100 in FIG.
[0050] At 3260, the DC-DC converter 100 obtains a current matching threshold. At 3261, the DC-DC converter 100 determines the difference between the calculated output current and the detected output current. At 3262, the DC-DC converter 100 determines whether the difference between the calculated output current and the detected output current is less than the current matching threshold. In such an embodiment, by comparing the difference between the calculated output current and the detected output current with a predetermined current matching threshold, erroneous comparison results due to minor detection interference are avoided.
[0051] If the DC-DC converter 100 determines that the difference between the calculated output current and the detected output current is less than the current matching threshold, then the method 326 proceeds to 3263. At 3263, the DC-DC converter 100 determines that the calculated output current matches the detected output current. The matching of the current indicates that the sensor is operating normally and the reading is reasonable. At 3264, the DC-DC converter 100 determines that the output current sensor is normal, that is, the rationality check for the output current sensor passes.
[0052] If the DC-DC converter 100 determines that the difference between the calculated output current and the detected output current is greater than the current matching threshold, then the method 326 proceeds to 3265. At 3265, the DC-DC converter 100 determines that the calculated output current does not match the detected output current. The current mismatch indicates that the sensor is operating abnormally, the reading is unreasonable, and cannot be used as a sampling result for electrical analysis. At 3266, the DC-DC converter 100 determines that the output current sensor is abnormal, that is, the rationality check for the output current sensor has failed.
[0053] Figure 3D FIG. 3 is a flow chart showing an example method 330 for overcurrent verification of a sensor according to some embodiments of the present disclosure. Figure 1 The method 330 is described in the environment shown in FIG. The method 330 may be performed by, for example, Figure 1 The DC-DC converter 100 in FIG.
[0054] like Figure 3DAs shown, at 331, the DC-DC converter 100 obtains the overcurrent threshold. At 332, the DC-DC converter 100 determines whether the detected output current is less than the overcurrent threshold. If the DC-DC converter 100 determines that the detected output current is less than the overcurrent threshold, the method 330 proceeds to 334. At 334, the DC-DC converter 100 determines that the output current is normal. If the DC-DC converter 100 determines that the detected output current is greater than the overcurrent threshold, the method 330 proceeds to 333. At 333, the DC-DC converter 100 determines that the output current is too large. Thus, accurate overcurrent verification of the output current sensor can be achieved.
[0055] Figure 5 A schematic block diagram of an example device 500 that can be used to implement an embodiment of the present disclosure is shown. As shown, the device 500 includes a computing unit 501, which can perform various appropriate actions and processes according to computer program instructions stored in a read-only memory (ROM) 502 or loaded from a storage unit 508 into a random access memory (RAM) 503. In the RAM 503, various programs and data required for the operation of the device 500 can also be stored. The computing unit 501, the ROM 502, and the RAM 503 are connected to each other via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.
[0056] A number of components in the device 500 are connected to the I / O interface 505, including, for example: an input unit 506, such as a keyboard, a mouse, etc.; an output unit 507, such as various types of displays, speakers, etc.; a storage unit 508, such as a disk, an optical disk, etc.; and a communication unit 509, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 509 allows the device 500 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.
[0057] The computing unit 501 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 501 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 501 performs the various methods and processes described above, such as methods 300, 320, 325, and 330. For example, in some embodiments, methods 300, 320, 325, and 330 may be implemented as a computer software program, which is tangibly included in a machine-readable medium, such as a storage unit 508. In some embodiments, part or all of the computer program may be loaded and / or installed on the device 500 via the ROM 502 and / or the communication unit 509. When the computer program is loaded into the RAM 503 and executed by the computing unit 501, one or more steps of the methods 300, 320, 325, and 330 described above may be performed. Alternatively, in other embodiments, the computing unit 501 may be configured to execute the methods 300 , 320 , 325 , and 330 in any other appropriate manner (eg, by means of firmware).
[0058] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chip systems (SOCs), load programmable logic devices (CPLDs), and the like.
[0059] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.
[0060] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In addition, although each operation is depicted in a specific order, this should be understood as requiring such operations to be performed in the specific order shown or in a sequential order, or requiring that all illustrated operations should be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Certain features described in the context of separate embodiments can also be implemented in a single implementation in combination. On the contrary, the various features described in the context of a single implementation can also be implemented in multiple implementations individually or in any suitable sub-combination.
[0061] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.
Claims
1. A DC-DC converter (100), adapted to be coupled between a power source (10) and a driving battery (20), the DC converter (100) comprising: A conversion circuit (110) configured to convert direct current input from the power source (10) to the driving battery (20); An input voltage sensor (120) configured to detect an input voltage input to the conversion circuit (110); An input current sensor (130) configured to detect an input current input to the conversion circuit (110); an output voltage sensor (140) configured to detect an output voltage output to the driving battery (20); an output current sensor (150) configured to detect an output current output to the driving battery (20); as well as The controller (160) is configured to: Calculating an output current based on the input voltage, the input current, and the output voltage; as well as The output current sensor (150) is calibrated based on the calculated output current and the detected output current.
2. The DC-DC converter (100) according to claim 1, wherein calculating the output current comprises: Determining input power based on the input voltage and the input current; as well as An output current is calculated based on the input power and the output voltage.
3. The DC-DC converter (100) according to claim 2, wherein determining the input power comprises: Obtaining power efficiency based on the input current and the input voltage; as well as An input power is determined based on the input voltage, the input current, and the power efficiency.
4. The DC-DC converter (100) according to claim 3, wherein obtaining the efficiency factor comprises: determining a nominal input power based on the input current and the input voltage; as well as A power efficiency corresponding to the nominal input power is selected in a power efficiency lookup table.
5. The DC-DC converter (100) according to claim 1, wherein verifying the output current sensor (150) comprises: determining whether the calculated output current matches the detected output current; as well as In response to determining that the calculated output current matches the detected output current, determining that the output current sensor (150) is normal; as well as In response to determining that the calculated output current does not match the detected output current, the output current sensor (150) is determined to be abnormal.
6. The DC-DC converter (100) according to claim 5, wherein determining whether the calculated output current matches the detected output current comprises: Get current matching threshold; determining a difference between the calculated output current and the detected output current; as well as In response to determining that the difference is less than the current matching threshold, it is determined that the calculated output current matches the detected output current.
7. The DC-DC converter (100) according to claim 6, wherein determining whether the calculated output current matches the detected output current further comprises: In response to determining that the difference is greater than the current matching threshold, it is determined that the calculated output current does not match the detected output current.
8. The DC-DC converter (100) according to claim 5, wherein the controller (160) is further configured to: In response to determining that the output current sensor (150) is abnormal, a request to enter a safe state is sent.
9. The DC-DC converter (100) according to claim 5, wherein the controller (160) is further configured to: In response to determining that the output current sensor (150) is normal, acquiring an overcurrent threshold; and In response to determining that the detected output current is less than the overcurrent threshold, maintaining the operating state; and In response to determining that the output current is greater than the overcurrent threshold, a request to enter a safe state is sent.
10. The DC-DC converter (100) of claim 1, wherein the power source (10) comprises a fuel cell.
11. A battery system comprising: A power supply (10) configured to output direct current; a drive battery (20) configured to supply power to components in the vehicle; as well as The DC-DC converter (100) according to claims 1 to 10 is coupled between the power source (10) and the driving battery and is configured to convert direct current input from the power source (10) to the driving battery (20).
12. A method for calibrating a current sensor of a DC-DC converter, comprising: Acquiring an input voltage detected by an input voltage sensor (120) and input to a conversion circuit (110) of a DC-DC converter (100), wherein the DC-DC converter is coupled between a power source (10) and a driving battery (20), and the conversion circuit (110) is configured to convert direct current input from the power source (10) to the driving battery (20); Acquiring an input current input to the conversion circuit (110) detected by an input current sensor (130); Acquiring an output voltage detected by an output voltage sensor (140) and outputted to the driving battery (20); Acquiring an output current detected by an output current sensor (150) and output to the driving battery (20); Calculating an output current based on the input voltage, the input current, and the output voltage; as well as The output current sensor (150) is calibrated based on the calculated output current and the detected output current.
13. A computer-readable storage medium having computer-executable instructions stored thereon, wherein the computer-executable instructions are executed by a processor to implement the method according to claim 12.