DC-DC converter, battery system, verification method and medium

Abstract

The invention relates to a DC-DC converter, a battery system, a verification method and a medium. The DC-DC converter includes: a conversion circuit including at least two phase conversion units and configured to convert a direct current input from a power source to a driving battery; at least two current sensors, each of the at least two current sensors detecting a phase current input to the phase conversion unit; an input current sensor detecting an input current input to the DC-DC converter; and a controller configured to: acquire at least two phase currents detected by the at least two current sensors and an input current; and verifying the at least two current sensors based on the at least two phase currents and the input current. In this way, the physical constraint relation between the measured value to be verified and the measured value associated with the measured value to be verified is utilized to execute verification, a redundant sensor specially aiming at the measured value to be verified can be omitted, and therefore the space requirement is reduced.

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] In some fuel cell vehicle architectures, a DC-DC converter such as a boost converter is provided between the power source and the drive battery or power battery to measure and control the current from the power source input to the drive battery. Conventional DC-DC converters may include multi-phase converter circuits. By increasing the number of phases of the converter circuit in the DC-DC converter, the ripple current of the DC input and output filter capacitors can be reduced.

[0003] Here, in order to realize the predetermined conversion function of the DC-DC converter, the DC-DC converter controller is required to control it according to the circuit of each phase. In a multi-phase DC-DC converter, an independent current sensor is provided for the inductor of each phase to obtain current information. The current sensor provides the controller with the current information of each phase. However, once the current sensor fails, there is a risk of failure of the DC converter due to the error in current acquisition. Summary of the invention

[0004] The embodiment of the present disclosure proposes a scheme for verifying the current sensor of each phase converter circuit in a DC-DC converter. In the first aspect of the present disclosure, a DC-DC converter is provided. The DC-DC converter is suitable for being coupled between a power supply and a driving battery, and the DC-DC converter includes: a conversion circuit, including at least two phase conversion units and configured to convert direct current input from the power supply to the driving battery; at least two current sensors, each of the at least two current sensors is coupled between one phase conversion unit of the at least two phase conversion units and the power supply, and is configured to detect the phase current input to the one phase conversion unit; an input current sensor, configured to detect the input current input to the DC-DC converter; and a controller, configured to: obtain at least two phase currents and input currents detected by at least two current sensors; and verify at least two current sensors based on at least two phase currents and input currents.

[0005] According to a second aspect of the present disclosure, a battery system is provided. The power system includes: 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, coupled between the power supply and the drive battery and 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 converter is provided. The method comprises: obtaining at least two phase currents in at least two phase conversion units of a conversion circuit of a DC-DC converter detected by at least two current sensors of the DC-DC converter, the conversion circuit being configured to convert direct current input from a power supply to a driving battery; obtaining input current input to the DC-DC converter detected by an input current sensor of the DC-DC converter, each current sensor of the at least two current sensors being coupled between one phase conversion unit of the at least two phase conversion units and the power supply; and verifying at least two current sensors based on the at least two phase currents and the input 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-3E A flowchart illustrating an example method for sensor calibration according to some embodiments of the present disclosure; and

[0013] Figure 4 A block diagram of a device in which various embodiments of the present disclosure may be implemented is shown. DETAILED DESCRIPTION

[0014] 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.

[0015] 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.

[0016] As discussed above, in order to prevent the DC converter from failing due to sensor failure, it is necessary to perform sensor calibration on the DC-DC sensor. To this end, the current sensor of each phase in the DC-DC converter in the power supply vehicle needs to be calibrated.

[0017] Conventionally, an additional sensor can be set for the current sensor to collect redundant signals. By comparing the redundant signals collected by the redundant sensor with the detected measurement signals, a reliability check for the current sensor can be performed. For example, in a single-phase conversion circuit of a DC-DC converter, a current sensor is provided to detect the current input into the phase. In order to meet the standard, another redundant current sensor can be set to detect the current value at the same position. The check for the current sensor can be performed by comparing whether the current detected by it matches the redundant current. However, in the scheme of setting redundant sensors, in addition to the additional sensors, electrical components for the redundant sensors must also be set. As a result, the complexity of the overall spatial layout and wiring is increased, resulting in increased difficulty in design and manufacturing.

[0018] In view of this, an embodiment of the present disclosure proposes a scheme for performing sensor calibration using the physical constraint relationship of currents at different positions. In this scheme, when the sensor of the two-phase converter circuit is calibrated, the measurement values ​​of the sensors associated with the current sensors of the two phases are first obtained, and then the sensor calibration is performed according to the physical constraint relationship between the associated measurement values ​​and the two-phase currents. In this way, by using the associated measurement values ​​for calibration, the redundant sensors conventionally set up specifically for calibration can be replaced, thereby achieving the rationality calibration of each phase current sensor at a lower cost and lower design difficulty.

[0019] Figure 1Schematic 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 driving 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 driving battery 20. The driving battery 20 may be, for example, an energy storage battery, and supplies power to various components in the vehicle. In order to match the direct current generated by the power supply 10 with the driving battery 20, a DC-DC converter 100 is provided between the power supply 10 and the driving battery 20 to adjust the voltage of the direct current input from the power supply 10 to the driving battery 20. Here, the DC-DC converter 100 may be a boost converter or a buck converter.

[0020] exist Figure 1 In the illustrated embodiment, the DC-DC converter 100 includes a conversion circuit. The conversion circuit 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 can increase or decrease the voltage of the direct current output by the power source 10 according to the application scenario and actual needs. In order to achieve the boost or buck function, the conversion circuit may include at least two phase conversion units. Figure 1 As shown, the conversion circuit includes conversion units 130-1, 130-2, and 130-N. Here, N is a positive integer greater than or equal to two.

[0021] The DC-DC converter 100 may include a variety of sensors for detecting its operating state. For example, on the input side of the DC-DC converter 100, an input voltage sensor for detecting the input voltage input to the input terminal of the conversion circuit 110, and an input current sensor 150 for detecting the input current input to the conversion circuit may be provided. The input voltage sensor may be connected in parallel to the line where the power supply 10 is connected to the conversion circuit. The input current sensor 150 may be connected in series to the line where the power supply 10 is connected to the conversion circuit 110. Accordingly, on the output side of the conversion circuit, an output voltage sensor for detecting the output voltage output from the conversion circuit 110 to the drive battery 20, and an output current sensor for detecting the output current output from the conversion circuit 110 to the drive battery 20 may be provided.

[0022] In addition, in the conversion circuit, a current sensor 120-1 for detecting the current of the conversion unit 130-1, a current sensor 120-2 for detecting the current of the conversion unit 130-2, and a current sensor 120-N (collectively referred to as the conversion circuit 130 with the conversion unit 130-1 and the conversion unit 130-2) for detecting the current of the conversion unit 130-N (collectively referred to as the conversion circuit 130 with the current sensor 120-1 and the current sensor 120-2). Each phase conversion unit 130 includes two power switches connected in series. For example, the conversion unit 130-1 includes two power switches 140-11 and 140-12 connected in series, the conversion unit 130-2 includes two power switches 140-21 and 140-22 connected in series, and the conversion unit 130-N includes two power switches 140-N1 and 140-N2 connected in series. The current sensor 120-1 is connected in series in a line where a connection point of two power switches 140-11 and 140-12 is connected to the power supply 10. The current sensor 120-2 is connected in series in a line where a connection point of two power switches 140-21 and 140-22 is connected to the power supply 10. The current sensor 120-N is connected in series in a line where a connection point of two power switches 140-N1 and 140-N2 is connected to the power supply 10.

[0023] like Figure 1 As shown, 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.

[0024] In this embodiment, the controller 160 is coupled to the current sensor 120 and the input current sensor 150, and can receive the detected phase current from the current sensor 120 and the detected input current from the input current sensor 150. The current sensor 120 and the input 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.

[0025] Figure 2 Schematic diagram of a sensing system 200 according to some embodiments of the present disclosure is shown. For the purpose of clarity and without loss of generality, Figure 2 Only the sensing components of the two-phase conversion unit are shown. Figure 2 As shown, the sensing system 200 includes a first current sensor 210 for sensing a first phase current, a second current sensor 220 for sensing a second phase current, and a controller 230 for analyzing the measured values. The first current sensor 210 and the second current sensor 220 may correspond to Figure 1Any two current sensors in Figure 2 In the illustrated embodiment, the first current sensor 210 includes a first sensor 211. The first sensor 211 is coupled in the first phase conversion circuit to be detected and detects the current in the circuit. The first current sensor 210 also includes a first sampling circuit 212 and a first analog-to-digital converter 213. The first sampling circuit 212 samples the analog signal received from the first sensor 211 and inputs the sampled signal into the first analog-to-digital converter 213. Afterwards, the sampled signal is quantized to generate a first digital signal 214 representing the detected current. Finally, the analog-to-digital converted first digital signal 214 is input into the controller 230. Similarly, the second current sensor 220 includes a second sensor 221. The second sensor 221 is coupled in the second phase conversion circuit to be detected and detects the current in the circuit. The second current sensor 220 also includes a second sampling circuit 222 and a second analog-to-digital converter 223. The second sampling circuit 222 samples the analog signal received from the second sensor 221 and inputs the sampled signal into the second analog-to-digital converter 223. Afterwards, the sampled signal is quantized to generate a second digital signal 224 representing the detected current. Finally, the analog-to-digital converted second digital signal 224 is input to the controller 230.

[0026] The controller 230 may perform a variety of checks on the first digital signal 214 and the second digital signal 224. For example, the controller 230 may first perform a valid range check 240 on the first digital signal 214 and a valid range check 250 on the second digital signal 224 to check whether the first digital signal 214 and the second digital signal 224 are within a predetermined valid range. If the controller 230 determines that both the first digital signal 214 and the second digital signal 224 are within a predetermined valid range, then the valid range check 240 and the valid range check 250 pass. Thereafter, the controller 230 performs a rationality check 270 on the first digital signal 214 and the second digital signal 224. When performing the rationality check 270, the controller 230 performs a check based on the relationship between the first digital signal 214 and the second digital signal 224 and the input current signal 260 to determine whether the detected first digital signal 214 and the second digital signal 224 are reasonable. For example, the first digital signal 214 and the second digital signal 224 satisfy a relative relationship with the input current signal 260, indicating that the detected first digital signal 214 and the second digital signal 224 are reasonable. In this way, it can be determined that the sensor is normal.

[0027] After determining that the sensor is normal, the controller 230 may perform other subsequent checks or analyses on the first digital signal 214 and the second digital signal 224 , respectively, such as an overcurrent check 280 for the first digital signal 214 and an overcurrent check 290 for the second digital signal 224 .

[0028] 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. 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 threshold for rationality calibration, a power supply current threshold and a consistency threshold for consistency calibration, and multiple overcurrent thresholds for overcurrent detection.

[0029] At 320, the DC-DC converter 100 performs a rationality check. The DC-DC converter 100 can perform a rationality check for each phase conversion circuit in the DC-DC converter 100. For example, the DC-DC converter 100 can perform a check based on the relationship between the current in each phase conversion circuit and the associated current. If the associated circuit meets the predetermined relationship with each circuit, the DC-DC converter 100 can determine that the sensor in each phase conversion circuit is operating normally and the reading is reasonable. Conversely, if the associated circuit does not meet the predetermined relationship with each circuit, the DC-DC converter 100 can determine that a certain sensor in all phase conversion circuits is operating abnormally and the reading is unreasonable. The method of rationality check will be described in detail later with reference to Figure B.

[0030] In some embodiments, the DC-DC converter may include two or more phase conversion circuits. In such embodiments, when performing a rationality check on the current sensor of each phase conversion circuit, the current measurement value of each phase and the total current value input to these phases may be obtained. The check is performed by comparing whether the sum of the currents of all phases matches the total current value.

[0031] 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. In some embodiments, when it is determined that the current sensor is abnormal, the controller can send a request to enter a safe state to the main control system of the vehicle to make the DC-DC converter enter a safe state to avoid the abnormality of the DC-DC converter due to the sensor abnormality. 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 detection 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.

[0032] Here, the DC-DC converter 100 may, for example, compare the detected current value with the acquired overcurrent threshold value. If the detected current value is greater than the acquired overcurrent threshold value, then the overcurrent check fails. Conversely, if the detected current value is less than the acquired overcurrent threshold value, then the overcurrent check passes. The overcurrent check will be referred to later. Figure 3D If the DC-DC converter 100 determines that the overcurrent check has failed, 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 360. At 360, the DC-DC converter 100 maintains the current operating state, that is, maintains normal operation.

[0033] While performing the rationality check, at 350, the DC-DC converter 100 performs a current consistency check to determine whether the currents in the conversion circuits of all phases are consistent. If the DC-DC converter 100 determines that all phase currents are consistent, the consistency check passes. If the DC-DC converter 100 determines that any phase current is inconsistent with other currents, the consistency check fails. 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 a safe mode. If the sensor operates normally, that is, the rationality check passes, the method 300 proceeds to 360. At 360, the DC-DC converter 100 maintains the current operating state, that is, maintains normal operation. Thus, through progressive multi-level sensor verification, the operating state of the sensor can be fully monitored. In addition, performing other checks after the rationality check passes can ensure the accuracy of other types of checks.

[0034] 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 1 The DC-DC converter 100 in FIG.

[0035] As discussed above, when performing a rationality check on the sensor, it is necessary to determine whether each phase current and the associated current satisfy a predetermined physical constraint condition, i.e., a corresponding physical relationship. In an embodiment of the present disclosure, the physical constraint condition is that the circuit input from the power supply 10 to the DC-DC converter 100 is equal to the sum of the currents of all phase conversion currents.

[0036] like Figure 3B As shown, at 321, at least two phase currents in at least two phase conversion units of the conversion circuit of the DC-DC converter (100) detected by at least two current sensors of the DC-DC converter (100) are obtained. In some embodiments, the power supply can be connected to the connection point of two power switches in each phase conversion unit, and a current sensor for one phase conversion unit can be connected in series to the line connecting the phase conversion unit to the power supply. For example, the DC-DC converter 100 can obtain the phase current input to the phase conversion unit 130-1 detected by the current sensor 120-1 connected in series to the line connecting the conversion unit 130-1 to the power supply 10.

[0037] At 322, an input current detected by an input current sensor input to the DC-DC converter is obtained. In some embodiments, an input current sensor may be connected in series to a line where the power source is connected to the DC-DC converter. For example, the DC-DC converter 100 may obtain an input current detected by an input current sensor 150 (also referred to as an input current sensor) connected in series to a line where the power source 10 is connected to the DC-DC converter 100 and input to the DC-DC converter 100.

[0038] In some embodiments, one of any two current sensors in the multi-phase current sensor may have Figure 2 The structure of the first current sensor 210 shown in FIG. 1 and the other current sensor of any two current sensors 110 may have Figure 2 The structure of the second current sensor 220 is shown. In addition, the input current sensor may also have a similar structure. In such an embodiment, the analog signals detected by the current sensor 120 and the input current sensor 150 are converted into matching digital signals through sampling and analog-to-digital conversion, and then input into the controller 160.

[0039] Thus, all current measurement values ​​involved in the relevant physical constraints are obtained. At 323, the DC-DC converter 100 verifies the at least two current sensors (120) based on the at least two-phase currents and the input current. In some embodiments, the DC-DC converter 100 can determine whether all phase currents and the input current satisfy the corresponding relationship, and thereby determine whether each current sensor in the at least two current sensors is operating normally. The verification method will be referred to later. Figure 3C Describe in detail.

[0040] In this way, it is possible to determine in a simple manner whether the current of each phase satisfies the predetermined relationship with the associated current, thereby completing the rationality check of the output current sensor without the need for additional detection devices or other complex reference value calculation methods.

[0041] The following will Figure 3C FIG. 3 is a flow chart showing an example method 323 for rationality checking of a sensor according to some embodiments of the present disclosure. Figure 1 The method 323 is described in the environment shown in FIG. The method 323 can be performed by, for example Figure 1 The DC-DC converter 100 in FIG.

[0042] At 3231, the DC-DC converter 100 determines the sum of all phase currents. At 3232, the DC-DC converter 100 determines the difference between the determined sum and the input current. At 3233, the DC-DC converter 100 determines whether the obtained difference is less than a current threshold. In such an embodiment, by comparing the sum of the currents and the difference between the input current and a predetermined threshold, erroneous comparison results due to minor detection disturbances can be avoided.

[0043] If the DC-DC converter 100 determines that the obtained difference is less than the current threshold, then the method 323 proceeds to 3234. The calculated difference is less than the current threshold, indicating that the sum of the currents of the two phases matches the input current, that is, the physical constraint relationship that the predetermined input current is equal to the output current is satisfied. At 3234, the DC-DC converter 100 determines that all current sensors are normal. If the DC-DC converter 100 determines that the obtained difference is greater than the current threshold, then the method 323 proceeds to 3235. The calculated difference is greater than the current threshold, indicating that the sum of the currents of the two phases does not match the input current, that is, the physical constraint relationship that the predetermined input current is equal to the output current is not satisfied. At 3235, the DC-DC converter 100 determines that at least one of all current sensors is abnormal. In such an embodiment, the current input from the power supply to the DC-DC converter is shunted into all phases, so the input current should match the current measurement values ​​of all phases. Based on this, if the input current matches the sum of the currents of all phases, it means that the sensor is operating normally and the reading is reasonable. Conversely, if the input current does not match the sum of the currents of all phases, it means that the sensor is operating abnormally, the reading is unreasonable, and it cannot be used as a sampling result for electrical analysis. In this way, it is possible to determine whether the sensor is normal through a simple correspondence between the currents at different positions.

[0044] 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 It should be understood that the over-current check method for the current of each phase conversion circuit is the same.

[0045] like Figure 3D As shown, at 331, the DC-DC converter 100 obtains the corresponding overcurrent threshold for the current sensor 120. At 332, the DC-DC converter 100 determines whether the detected phase current is less than the overcurrent threshold. If the DC-DC converter 100 determines that the detected phase current is less than the corresponding overcurrent threshold, the method 330 proceeds to 334. At 334, the DC-DC converter 100 determines that the phase current is normal. If the DC-DC converter 100 determines that the detected phase current is greater than the corresponding overcurrent threshold, the method 330 proceeds to 333. At 333, the DC-DC converter 100 determines that the phase current is too large, that is, the overcurrent check fails. Thus, accurate overcurrent check of each phase current sensor can be achieved.

[0046] Figure 3EFIG. 3 is a flow chart showing an example method 350 for consistency checking of a sensor according to some embodiments of the present disclosure. Figure 1 The method 350 is described in the environment shown in FIG. The method 350 may be performed by, for example, Figure 1 The DC-DC converter 100 in FIG.

[0047] like Figure 3E As shown, at 351, the DC-DC converter 100 obtains a power supply current threshold and a consistency threshold. The power supply current threshold can, for example, indicate that each phase conversion unit in the conversion circuit is working. At 352, the DC-DC converter 100 determines whether the detected input current is greater than the power supply current threshold. If the DC-DC converter 100 determines that the detected input current is less than the power supply current threshold, the method 330 returns to 352 until the detected input current is greater than the power supply current threshold. If the DC-DC converter 100 determines that the detected input current is greater than the power supply current threshold, the method 330 proceeds to 353. At 353, the DC-DC converter 100 determines whether any two phase currents of all phase currents match.

[0048] In some embodiments, the DC-DC converter 100 may determine an average value of the phase current of each phase within a predetermined time period. Thereafter, the DC-DC converter 100 may calculate the difference between each two average values ​​and compare the calculated difference with a consistency threshold. If the DC-DC converter 100 determines that the calculated difference is less than the consistency threshold, it is determined that the compared two-phase currents match. If the DC-DC converter 100 determines that the calculated difference is greater than the consistency threshold, it is determined that the compared two-phase currents do not match. In such an embodiment, by determining the average value within the same time period, the effect caused by current toggling can be removed.

[0049] If the DC-DC converter 100 determines that any two phase currents match, the method 350 proceeds to 355. At 355, the DC-DC converter 100 determines that the phase currents of all phases are consistent, that is, the consistency check passes. If the DC-DC converter 100 determines that there are two phase currents that do not match, the method 350 proceeds to 354. At 354, the DC-DC converter 100 determines that at least one phase current is inconsistent with other phase currents, that is, the consistency check fails. In some embodiments, the DC-DC converter 100 can also determine whether there is a third phase current different from the first phase current and the second phase current when determining that the first phase current of all phase currents is inconsistent with the second phase current. If the DC-DC converter 100 determines that the third phase current is also included, the DC-DC converter 100 compares the first phase current with the third phase current, and determines whether the first phase current is consistent with the third phase current. If the DC-DC converter 100 determines that the first phase current is consistent with the third phase current, the DC-DC converter 100 determines that the current sensor associated with the second phase current is abnormal. If the DC-DC converter 100 determines that the first phase current is inconsistent with the third phase current, the DC-DC converter 100 determines that the current sensor associated with the first phase current is abnormal.

[0050] In such an embodiment, when the phase current is more than two phases, that is, at least three phases, when it is confirmed that the phase currents of two phases are different, the other phase can be used as a reference to determine which of the two inconsistent phase currents is abnormal, thereby determining that the current sensor associated with the phase current is abnormal. In this way, the consistency check between the two-phase current sensors can be achieved, and the safety of the DC-DC converter 100 is improved. In an embodiment where the DC-DC converter includes more phase conversion circuits, when the consistency check is performed on the current sensor of each phase conversion circuit, the current measurement values ​​of each two phases can be compared.

[0051] Figure 4 A schematic block diagram of an example device 400 that can be used to implement an embodiment of the present disclosure is shown. As shown, the device 400 includes a computing unit 401, which can perform various appropriate actions and processes according to computer program instructions stored in a read-only memory (ROM) 402 or loaded from a storage unit 408 into a random access memory (RAM) 403. In the RAM 403, various programs and data required for the operation of the device 400 can also be stored. The computing unit 401, the ROM 402, and the RAM 403 are connected to each other via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0052] A number of components in the device 400 are connected to the I / O interface 405, including: an input unit 406, such as a keyboard, a mouse, etc.; an output unit 407, such as various types of displays, speakers, etc.; a storage unit 408, such as a disk, an optical disk, etc.; and a communication unit 409, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 409 allows the device 400 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0053] The computing unit 401 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 401 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 401 performs the various methods and processes described above, such as methods 300, 320, 323, 330, and 350. For example, in some embodiments, methods 300, 320, 323, 330, and 350 may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 408. In some embodiments, part or all of the computer program may be loaded and / or installed on the device 400 via the ROM 402 and / or the communication unit 409. When the computer program is loaded into the RAM 403 and executed by the computing unit 401, one or more steps of the methods 300, 320, 323, 330, and 350 described above may be performed. Alternatively, in other embodiments, the computing unit 401 may be configured to perform the methods 300, 320, 323, 330, and 350 in any other appropriate manner (e.g., by means of firmware).

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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-DC converter (100) comprising: A conversion circuit (110) comprising at least two phase conversion units (130) and configured to convert direct current input from the power source (10) to the driving battery (20); at least two current sensors (120), each of the at least two current sensors (120) being coupled between one phase conversion unit of the at least two phase conversion units (130) and the power supply (10), and being configured to detect a phase current input to the one phase conversion unit; An input current sensor (150) configured to detect an input current input to the DC-DC converter (100); as well as The controller (160) is configured to: Acquiring at least two-phase currents detected by the at least two current sensors (120) and the input current; as well as The at least two current sensors (120) are calibrated based on the at least two-phase currents and the input current.

2. The DC-DC converter (100) according to claim 1, wherein verifying the at least two current sensors (120) comprises: determining whether the sum of the at least two-phase currents matches the input current; as well as In response to determining that the sum of the at least two-phase currents matches the input current, determining that the at least two current sensors (120) are normal; as well as In response to determining that the sum of the at least two current sensors (120) does not match the input current, at least one current sensor of the at least two current sensors (120) is determined to be abnormal.

3. The DC-DC converter (100) according to claim 2, wherein determining whether the sum of the at least two-phase currents matches the input current comprises: Determining a difference between a sum of the at least two-phase currents and the input current; as well as In response to the difference being less than a current threshold, determining that a sum of the at least two-phase currents matches the input current; as well as In response to the difference being greater than the current threshold, it is determined that the at least two-phase currents do not match the input current.

4. The DC-DC converter (100) according to claim 2, wherein the controller (160) is further configured to: In response to determining that at least one of the at least two current sensors (120) is abnormal, a request to enter a safe state is sent.

5. The DC-DC converter (100) according to claim 2, wherein the controller (160) is further configured to: In response to determining that the at least two current sensors (120) are normal, performing overcurrent detection on the at least two current sensors (120); In response to determining that the phase currents of the at least two phases are not overcurrent, maintaining a normal state; and In response to determining that a phase current of one of the at least two phase currents is overcurrent, a request to enter a safe state is sent.

6. The DC-DC converter (100) according to claim 5, wherein performing the overcurrent detection comprises: comparing a phase current of the at least two phase currents with a corresponding overcurrent threshold; In response to determining that the one-phase current is less than the corresponding overcurrent threshold, determining that the one-phase current is not overcurrent; as well as In response to determining that the one-phase current is greater than the corresponding overcurrent threshold, it is determined that the one-phase current is overcurrent.

7. The DC-DC converter (100) according to claim 1, wherein the controller (160) is further configured to: In response to determining that the input current is greater than a power supply current threshold, determining whether any two phase currents of the at least two phase currents are consistent; as well as In response to determining that the phase currents of the arbitrary two phases are consistent, maintaining a normal state; as well as In response to determining that a first phase current and a second phase current of the at least two phase currents are inconsistent, a request to enter a safe state is sent.

8. The DC-DC converter (100) according to claim 7, wherein the controller (160) is further configured to: In response to determining that the first phase current is inconsistent with the second phase current, determining whether the at least two phase currents further include a third phase current; In response to determining that the at least two-phase currents also include the third phase current, comparing the first phase current with the third phase current; and In response to determining that the first phase current is consistent with the third phase current, determining that a current sensor associated with the second phase current is abnormal; or In response to determining that the first phase current is inconsistent with the third phase current, it is determined that a current sensor associated with the first phase current is abnormal.

9. The DC-DC converter (100) according to claim 8, wherein determining whether the phase currents of any two phases are consistent comprises: determining a first average value of the first phase current over a period of time; determining a second average value of the second phase current during the period of time; determining a difference between the first average and the second average; as well as In response to determining that the difference between the first average value and the second average value is less than a consistency threshold, determining that the first phase current and the second phase current are consistent; as well as In response to determining that the difference between the first average value and the second average value is greater than the consistency threshold, it is determined that the first phase current and the second phase current are inconsistent.

10. The DC-DC converter (100) according to claim 1, wherein one phase conversion unit of the at least two phase conversion units (130) comprises two power switches connected in series, and a current sensor associated with the one phase conversion unit is connected in series in a line connected to the power supply at a connection point of the two power switches.

11. The DC-DC converter (100) of claim 1, wherein the power source (10) comprises a fuel cell.

12. 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 any one of claims 1 to 11 is coupled between the power source (10) and the driving battery (20) and is configured to convert direct current input from the power source (10) to the driving battery (20).

13. A method for calibrating a current sensor of a DC converter, comprising: Acquiring at least two phase currents detected by at least two current sensors of a DC-DC converter (100) and input into at least two phase conversion units of a conversion circuit of the DC-DC converter (100), wherein the conversion circuit is configured to convert direct current input from a power source (10) to a driving battery (20); Acquiring an input current input to the DC-DC converter (100) detected by an input current sensor (150) of the DC-DC converter (100), wherein each of the at least two current sensors (120) is coupled between one phase conversion unit of the at least two phase conversion units (130) and the power source (10); as well as The at least two current sensors (120) are calibrated based on the at least two-phase currents and the input current.

14. 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 13.

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