Current control method, device and system, and storage medium

Abstract

The present application discloses a current control method, device and system, and a storage medium, aiming at solving the problem of unbalanced current output from a plurality of power supply modules. The method comprises: in a pre-charging process, monitoring an execution progress of the pre-charging process; when the execution progress of the pre-charging process represents that pre-charging is completed, monitoring current corresponding to a plurality of power supply modules; acquiring a maximum current value and a minimum current value of the plurality of power supply modules; determining whether a difference between the maximum current value and the minimum current value is greater than a preset difference; and when the difference is greater than the preset difference, performing current balancing adjustment on the power supply modules. By using the present solution, the situation of unbalanced current output from a plurality of power supply modules can be avoided, thereby prolonging the service life of the power supply modules.

Description

Current control method, device, system and storage medium TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply control, in particular to a current control method, device, system and storage medium. BACKGROUND

[0002] With the popularity of electric vehicles, hybrid vehicles and other new energy vehicles, the power module as the core component of high-low voltage conversion has become an indispensable part of the power system of the vehicle. When the vehicle starts, the low-voltage power is mainly supplied by the low-voltage storage battery, and after the power battery pack is powered on, the power battery pack inputs high-voltage direct current to the power module through the high-voltage power distribution system; the power module converts the high-voltage direct current into low-voltage direct current to supply power to the low-voltage power equipment of the whole vehicle; when it is detected that the voltage of the low-voltage storage battery is insufficient, the power module charges the low-voltage storage battery.

[0003] In order to meet the requirements of vehicle load power and ensure the reliability of the power supply system, the outputs of the vehicle-mounted power modules are often connected in parallel, and the output power changes with the load on the vehicle. When multiple power modules work at the same time, due to the consistency of the power supply, output impedance and other reasons, the low-voltage output current of each power module is inconsistent, which affects the overall life of the system.

[0004] Therefore, how to provide a current control method to avoid the imbalance of the output current of multiple power modules and prolong the service life of the power module has become a technical problem to be solved. SUMMARY

[0005] The present application provides a current control method, device, system and storage medium to avoid the imbalance of the output current of multiple power modules and prolong the service life of the power module.

[0006] The present application provides a current control method, comprising:

[0007] In the pre-charging process, the execution progress of the pre-charging process is monitored;

[0008] When the execution progress of the pre-charging process represents that the pre-charging is completed, the currents corresponding to the multiple power modules are monitored;

[0009] The maximum current value and the minimum current value in the multiple power modules are obtained;

[0010] It is judged whether the difference between the maximum current value and the minimum current value is greater than a preset difference value;

[0011] When the difference is greater than the preset difference value, the current of the power module is adjusted.

[0012] The application has the beneficial effects that: after the pre-charging is completed, the output currents of different power modules are monitored in real time, and when the difference between the maximum current value and the minimum current value in the multiple power modules is greater than a preset difference value, the power modules are adjusted for current sharing, so that the output current of each power module is kept within the preset difference value range, the output currents of each power module are kept substantially consistent, the problem of unbalanced output currents of multiple power modules is avoided, and the service life of the power modules is prolonged.

[0013] In one embodiment, the monitoring of the execution progress of the pre-charging process comprises:

[0014] Obtaining the DC bus voltage;

[0015] Judging the ratio of the DC bus voltage to the high-voltage side voltage of the multiple power modules;

[0016] Determining the execution progress of the pre-charging process according to the ratio of the DC bus voltage to the high-voltage side voltage of the multiple power modules, wherein when the ratio of the DC bus voltage to the high-voltage side voltage of the multiple power modules is 1, it represents that the pre-charging is completed.

[0017] In one embodiment, the pre-charging process is as follows:

[0018] When it is detected that the high-voltage DC bus of the vehicle needs to be pre-charged, an initial low voltage is output to the DC bus through the battery pack connected with the power module, and the initial low voltage is boosted through the power module;

[0019] During the boosting process, the output current of the power module is controlled to decrease with the increase of the bus voltage;

[0020] When the high-voltage side voltage of the power module is equal to the DC bus voltage, a trickle current is used to maintain the constant of the bus voltage.

[0021] In one embodiment, the method further comprises:

[0022] After the pre-charging is completed, the voltage of the battery connected with the power module is monitored;

[0023] When the output voltage of the battery decreases, the output current of the battery is controlled to decrease with the decrease of the output voltage of the battery;

[0024] When the output voltage of the battery decreases to the minimum limit value of the output voltage, the output current is stopped.

[0025] In one embodiment, the power module corresponding to the minimum current value is a first power module, and the power module corresponding to the maximum current value is a second power module, and the adjusting of the power modules for current sharing comprises:

[0026] when the voltage of the first power module is less than the first preset value, increasing the voltage of the first power module by a preset step size;

[0027] when the current difference between the first power module and the second power module is less than the preset difference value, and the voltage of the first power module is still less than or equal to the first preset value, determining that the current sharing adjustment of the first power module and the second power module is completed.

[0028] In one embodiment, the method further comprises:

[0029] when the voltage of the first power module is increased to the first preset value, and the current difference between the first power module and the second power module is still greater than the preset difference value, decreasing the voltage of the second power module by a preset step size until the current difference between the first power module and the second power module is less than the preset difference value.

[0030] In one embodiment, the method further comprises:

[0031] when the current sharing adjustment of the power modules is completed, continuing to determine whether the difference between the maximum current value and the minimum current value of the plurality of power modules is greater than the preset difference value, and when the difference is greater than the preset difference value, continuing to perform the current sharing adjustment on the power modules.

[0032] The application also provides a current control device, comprising:

[0033] a first monitoring module configured to monitor the execution progress of the pre-charging process during the pre-charging process;

[0034] a second monitoring module configured to monitor the currents of the plurality of power modules when the execution progress of the pre-charging process indicates that the pre-charging is completed;

[0035] an obtaining module configured to obtain the maximum current value and the minimum current value of the plurality of power modules;

[0036] a determining module configured to determine whether the difference between the maximum current value and the minimum current value is greater than a preset difference value;

[0037] an adjusting module configured to perform current sharing adjustment on the power modules when the difference is greater than the preset difference value.

[0038] In one embodiment, the first monitoring module comprises:

[0039] an obtaining sub-module configured to obtain the DC bus voltage;

[0040] a determining sub-module configured to determine the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules;

[0041] The first determining sub-module is configured to determine the execution progress of the pre-charging process according to the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules, wherein when the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules is 1, it indicates that the pre-charging is completed.

[0042] In one embodiment, the pre-charging process is as follows:

[0043] When it is detected that the high-voltage DC bus of the vehicle needs to be pre-charged, an initial low voltage is output to the DC bus by the battery pack connected to the power module, and the initial low voltage is boosted by the power module;

[0044] During the boosting process, the output current of the power module is controlled to decrease with the increase of the bus voltage;

[0045] When the high-voltage side voltage of the power module is equal to the DC bus voltage, a trickle current is used to maintain the constant of the bus voltage.

[0046] In one embodiment, the device further comprises:

[0047] The third monitoring module is configured to monitor the voltage of the battery pack connected to the power module after the pre-charging is completed;

[0048] The control module is configured to control the output current of the battery pack to decrease with the decrease of the output voltage of the battery pack when the output voltage of the battery pack decreases;

[0049] The stop module is configured to stop the output current when the output voltage of the battery pack decreases to the minimum limit value of the output voltage.

[0050] In one embodiment, the power module corresponding to the minimum current value is a first power module, and the power module corresponding to the maximum current value is a second power module, and the adjusting module comprises:

[0051] The raising sub-module is configured to raise the voltage of the first power module by a preset step when the voltage of the first power module is less than a first preset value;

[0052] The second determining sub-module is configured to determine that the current equalization adjustment of the first power module and the second power module is completed when the current difference between the first power module and the second power module is less than a preset difference value, and the voltage of the first power module is still less than or equal to the first preset value.

[0053] In one embodiment, the device further comprises:

[0054] decrease the voltage of the second power module by a preset step size until the current difference between the first power module and the second power module is less than the preset difference value.

[0055] In one embodiment, the determining module is further configured to:

[0056] When the current sharing adjustment of the power modules is completed, the difference between the maximum current value and the minimum current value of the plurality of power modules is continuously determined, and when the difference is greater than the preset difference value, the current sharing adjustment of the power modules is continuously performed.

[0057] The application also provides a current control system, comprising:

[0058] at least one processor; and

[0059] a memory in communication connection with the at least one processor; wherein

[0060] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the current control method described in any of the above embodiments.

[0061] The application also provides a computer readable storage medium, when the instructions in the storage medium are executed by the processor corresponding to the current control system, the current control system can implement the current control method described in any of the above embodiments.

[0062] Other features and advantages of the application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims, and the appended drawings.

[0063] The technical solutions of the application will be further described in detail below with the aid of the accompanying drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0064] The accompanying drawings are intended to provide further understanding of the application, and constitute a part of the specification, and are used to explain the application together with the embodiments of the application, and do not constitute a limitation to the application. In the drawings:

[0065] Fig. 1 is a flow chart of a current control method in an embodiment of the application;

[0066] Fig. 2 is a structural schematic diagram of a current control device in an embodiment of the application;

[0067] Fig. 3 is a schematic diagram of a hardware structure of a current control system according to an embodiment of the present application. DETAILED DESCRIPTION

[0068] The preferred embodiments of the present application will be described hereinafter with reference to the accompanying drawings, in which, it should be understood that these described preferred embodiments are presented by way of explanation of the application, and are not intended to limit the present application.

[0069] The power module is a core component of the high-low voltage conversion of the electric power system of the electric vehicle. Since the power module has adjustable output voltage and current, the power module can be adjusted for current sharing according to actual requirements to achieve the required output voltage or current.

[0070] Fig. 1 is a flowchart of a current control method according to an embodiment of the present application. As shown in Fig. 1, the method can be implemented as the following steps S101-S105:

[0071] In step S101, during the pre-charging process, the execution progress of the pre-charging process is monitored.

[0072] In step S102, when the execution progress of the pre-charging process indicates that the pre-charging is completed, the currents corresponding to the plurality of power modules are monitored.

[0073] In step S103, the maximum current value and the minimum current value in the plurality of power modules are obtained.

[0074] In step S104, it is determined whether the difference between the maximum current value and the minimum current value is greater than a preset difference value.

[0075] In step S105, when the difference is greater than the preset difference value, the power module is adjusted for current sharing.

[0076] In the present application, the execution progress of the pre-charging process is monitored during the pre-charging process. Pre-charging is to prevent damage to electrical appliances caused by sparks and high temperature generated by high voltage circuits at the moment of contact during charging or discharging. Specifically, there are various methods to determine the execution progress of the pre-charging process, such as monitoring the bus voltage reaching a certain value, the pre-charging time reaching a preset length, etc. In an embodiment of the present application, the execution progress of the pre-charging process is determined by monitoring the ratio of the DC bus voltage to the high voltage side voltage of the plurality of power modules. During the pre-charging process, the DC bus voltage is obtained, for example, by resistance voltage division method and optocoupler isolation method, etc. Then the ratio of the DC bus voltage to the high voltage side voltage of the plurality of power modules is judged. Since the initial low voltage is output to the DC bus through the battery pack connected with the power module when it is detected that the vehicle high voltage DC bus needs to be pre-charged, and the initial low voltage is boosted by the power module. For example, the low voltage 24V of the battery is boosted to the high voltage DC bus of 400V-1200V through the boosting method, and the DC bus is pre-charged. Therefore, the execution progress of the pre-charging process can be determined according to the ratio of the DC bus voltage to the high voltage side voltage of the plurality of power modules, wherein when the ratio of the DC bus voltage to the high voltage side voltage of the plurality of power modules is 1, it indicates that the pre-charging is completed.

[0077] When the execution progress of the pre-charging process indicates that the pre-charging is completed, the currents corresponding to the plurality of power modules are monitored. When the execution progress of the pre-charging process indicates that the pre-charging is completed, it means that the system has reached a relatively stable state, and the next operation can be performed. Since the power modules may have differences in actual work, their output currents may be different. Therefore, after the pre-charging is completed, the currents corresponding to the plurality of power modules are monitored to understand the output of each power module and to discover the current imbalance in time.

[0078] The maximum current value and the minimum current value in the plurality of power modules are obtained. The maximum current value and the minimum current value reflect the extreme situation of the current difference between the power modules. By comparing the two values, the degree of current imbalance can be quickly judged. Therefore, the output currents of the plurality of power modules are compared to find the maximum value and the minimum value.

[0079] determining whether the difference between the maximum current value and the minimum current value is greater than a preset difference value. The preset difference value is a threshold value determined according to system requirements and actual experience, and represents an acceptable current imbalance degree. If the difference between the maximum current value Imax and the minimum current value Imin is less than the preset difference value, it indicates that the current imbalance is within an acceptable range, and the system can continue to operate normally; if the difference is greater than the preset difference value, current equalization adjustment needs to be performed. For example, if the preset difference value is set to 5 A, when Imax-Imin≥5 A, current equalization adjustment is started; when Imax-Imin≤5 A, no current equalization adjustment is performed.

[0080] When the difference between the maximum current value and the minimum current value is greater than the preset difference value, current sharing adjustment is performed on the power modules. The goal of current sharing adjustment is to make the output currents of the power modules as close as possible to ensure stable operation of the system. Through current sharing adjustment, the reliability and efficiency of the power supply system can be improved, and the service life of the power modules can be prolonged. For example, define the power module corresponding to the minimum current value Imin as a first power module, and define the power module corresponding to the maximum current value as a second power module. When the voltage of the first power module is less than a first preset value, the voltage of the first power module is increased by a preset step. For example, the maximum output voltage of the power module is set to be no more than 110% of the rated output voltage Va, and the first preset value can be set to be Va x 110%. Therefore, when Imax-Imin≥5A, current sharing adjustment is started, and if the voltage Vref1 of the first power module is less than the first preset value, the voltage Vref1 of the first power module is gradually increased, and the step is 0.1-1V. In this way, the output port voltage of the first power module starts to increase, and the output current of the first power module gradually increases. During the voltage increasing process of the first power module, when the current difference between the first power module and the second power module is less than the preset difference value, and the voltage of the first power module is still less than or equal to the first preset value, it is determined that the current sharing adjustment of the first power module and the second power module is completed. When the voltage of the first power module increases to the first preset value, and the current difference between the first power module and the second power module is still greater than the preset difference value, the voltage of the second power module is decreased by a preset step until the current difference between the first power module and the second power module is less than the preset difference value. For example, when Imax-Imin≥5A and Vref1=Va x 110%, the voltage Vref2 of the second power module starts to decrease, and the step is 0.1-1V. With the decrease of the voltage of the second power module, the output current of the second power module starts to decrease, and when Imax-Imin≤5A, the current sharing control strategy is stopped. In an embodiment of the present application, a minimum value range of the second power module can also be set, and then the value range of the second power module can be determined. For example, the value range is (90% x Va)≤Vref≤(Va x 110%), and when the power of the second power module decreases to the minimum value, the second power module is no longer controlled to decrease, and the output voltages of other power modules are adjusted to achieve current balance.

[0081] It can be understood that, in order to continuously implement current sharing control of the power supply, when the current sharing adjustment of the power modules is completed, it is continuously judged whether the difference between the maximum current value and the minimum current value of the plurality of power modules is greater than the preset difference value, and when the difference is greater than the preset difference value, the current sharing adjustment of the power modules is continuously performed.

[0082] In an embodiment of the present application, in order to ensure the safe and stable operation of the battery and the entire system, the voltage of the battery connected with the power module is monitored after the pre-charging is completed; by continuously monitoring the battery voltage, the working state of the battery can be known in time. If the battery voltage fluctuates abnormally or drops too fast, it may mean that there is a problem in the system, such as excessive load, power module failure or battery performance decline. Timely discovery of these problems can take appropriate measures to ensure the stable operation of the entire system. When the output voltage of the battery decreases, the output current of the battery is controlled to decrease with the decrease of the output voltage of the battery; as the output voltage of the battery decreases, the remaining power of the battery also decreases. If the output current is not controlled, it may cause the battery to be over-discharged, thereby damaging the battery. By making the output current decrease with the decrease of the output voltage, the battery can be protected to some extent to avoid over-discharge. When the output voltage of the battery decreases to the minimum limit value of the output voltage, the output current is stopped. The minimum limit value of the output voltage is usually determined according to the characteristics of the battery and the design requirements. When the output voltage decreases to this limit value, continuing to output current may cause serious damage to the battery. Stopping the output current can avoid this situation and protect the safety of the battery. For example, during the bus charging process, the rated voltage Vrbat of the battery, the battery voltage Vbat, the minimum battery voltage Vbat_min, and AVbat = (Vrbat-Vbat_min) are monitored in real time. When the battery voltage decreases to 50% x AVbat+Vbat_min, the output current is adjusted to decrease to 50% x Ibmax. When the battery voltage decreases to 80% x AVbat+Vbat_min, the output current is adjusted to decrease to 20% x Ibmax. When the battery voltage decreases to Vbat_min, the output is stopped. Of course, other ways of decreasing the output current with the decrease of the voltage can also be used, which will not be expanded herein.

[0083] Through the scheme provided in the present application, when multiple power supplies are working, the output currents of each power supply can be accurately balanced, so that each power supply output current works within a certain interval, while reducing the risk of internal device thermal runaway caused by power imbalance between devices, and improving the service life of the power supply.

[0084] The present application has the beneficial effect that after the pre-charging is completed, the output currents of different power modules are monitored in real time, and when the difference between the maximum current value and the minimum current value in the multiple power modules is greater than the preset difference value, the power module is adjusted for current balancing, so that the output current of each power module is maintained within the preset difference value range, and the output currents of each power module are kept basically consistent, avoiding the problem of unbalanced output currents of multiple power modules, thereby prolonging the service life of the power module.

[0085] In one embodiment, the above step S101 can be implemented as steps A1-A3 as follows:

[0086] In step A1, the DC bus voltage is acquired;

[0087] In step A2, the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules is determined;

[0088] In step A3, the execution progress of the pre-charging process is determined according to the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules, wherein when the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules is 1, it indicates that the pre-charging is completed.

[0089] In one embodiment, the pre-charging process in the above step S101 can be implemented as steps B1-B3 as follows:

[0090] In step B1, when it is detected that the high-voltage DC bus of the vehicle needs to be pre-charged, an initial low voltage is output to the DC bus through the battery pack connected to the power module, and the initial low voltage is boosted through the power module;

[0091] In step B2, during the boosting process, the output current of the power module is controlled to decrease as the bus voltage increases;

[0092] In step B3, when the high-voltage side voltage of the power module is equal to the DC bus voltage, a trickle current is used to maintain the constant bus voltage.

[0093] The power supply system of the vehicle includes components such as a battery pack, a power module, and a DC bus. The battery pack is the main energy storage device of the vehicle and provides power for the entire vehicle system. The battery stores electrical energy through a charging process. The power module is the core component for high-low voltage conversion. When the vehicle starts, low-voltage power is mainly supplied by the low-voltage battery, and after the power battery pack is powered on, the battery pack inputs high-voltage DC power to the power module through the high-voltage power distribution system; the power module converts the high-voltage DC power into low-voltage DC power to supply power to the low-voltage electrical equipment of the entire vehicle; when it is detected that the low-voltage battery voltage is insufficient, the power module charges the low-voltage battery. The DC bus is an important channel for vehicle power transmission and is used to connect the battery, the power module, and various electrical appliances. The DC bus is responsible for efficiently transmitting the electrical energy provided by the battery to various electrical appliances.

[0094] In order to prevent damage to electrical appliances caused by sparks and high temperature generated by high-voltage circuits during charging or discharging, the application performs pre-charging before charging and discharging of the vehicle to slowly raise the voltage and avoid impact on electrical appliances.

[0095] When it is detected that the vehicle high-voltage DC bus needs to be pre-charged, an initial low voltage is output to the DC bus by a battery connected to the power module, and the initial low voltage is boosted by the power module. For example, when the vehicle high-voltage DC bus needs to be pre-charged, the low voltage 24V of the battery is gradually increased to the high-voltage DC bus of 400V-1200V by the bidirectional DC / DC power module in a boosting manner to pre-charge the DC bus.

[0096] During the boosting process, the output current of the power module is controlled to decrease as the bus voltage increases. As the bus voltage increases, if the output current does not decrease, it may cause excessive current in the circuit and damage the circuit. Therefore, in this application, the output current is decreased as the bus voltage increases to avoid overcurrent. At the same time, the entire system can maintain relatively stable operation in different working states. There are many specific ways to reduce, for example, set the bus voltage as Vbus and the maximum output current value as Ibmax, then monitor the high-voltage side voltage Vhout of the power module, when the Vhout voltage rises to 50% x Vbus, adjust the output current Ib to decrease to 50% x Ibmax; when the Vhout voltage rises to 80% x Vbus, adjust the output current Ib to decrease to 20% x Vbus. Of course, the corresponding relationship between the bus voltage increase and the power module output current decrease can also be set in advance to smoothly reduce the current, which will not be expanded in this application.

[0097] When the high-voltage side voltage of the power module is equal to the DC bus voltage, a trickle current is used to maintain the constant of the bus voltage. That is, when the bus voltage charging is completed, Vhout = Vbus, a trickle current Itri is used to maintain the constant of the bus voltage.

[0098] In one embodiment, the above method can also be implemented as steps C1-C3 as follows:

[0099] In step C1, after the pre-charging is completed, the voltage of the battery connected to the power module is monitored;

[0100] In step C2, when the output voltage of the battery decreases, the output current of the battery is controlled to decrease as the output voltage of the battery decreases;

[0101] In step C3, when the output voltage of the battery decreases to the minimum limit value of the output voltage, the output current is stopped.

[0102] In one embodiment, the minimum current value corresponds to the first power module, and the maximum current value corresponds to the second power module, and the above step S105 can be implemented as steps D1-D2 as follows:

[0103] In step D1, when the voltage of the first power module is less than the first preset value, the voltage of the first power module is increased by a preset step size;

[0104] In step D2, when the current difference between the first power module and the second power module is less than a preset difference value, and the voltage of the first power module is still less than or equal to the first preset value, it is determined that the current sharing adjustment of the first power module and the second power module is completed.

[0105] In one embodiment, the above method can also be implemented as the following step D3:

[0106] In step D3, when the voltage of the first power module is increased to the first preset value, and the current difference between the first power module and the second power module is still greater than the preset difference value, the voltage of the second power module is decreased by a preset step size until the current difference between the first power module and the second power module is less than the preset difference value.

[0107] In one embodiment, the above method can also be implemented as the following step:

[0108] When the current sharing adjustment of the power modules is completed, it is continuously determined whether the difference between the maximum current value and the minimum current value of the plurality of power modules is greater than a preset difference value, and when it is greater than the preset difference value, the current sharing adjustment of the power modules is continuously performed.

[0109] FIG. 2 is a structural schematic diagram of a current control device in an embodiment of the present application, as shown in FIG. 2, the device includes:

[0110] The first monitoring module 201 is configured to monitor the execution progress of the pre-charging process during the pre-charging process.

[0111] The second monitoring module 202 is configured to monitor the currents of the plurality of power modules when the execution progress of the pre-charging process indicates that the pre-charging is completed.

[0112] The acquisition module 203 is configured to acquire the maximum current value and the minimum current value in the plurality of power modules.

[0113] The determination module 204 is configured to determine whether the difference between the maximum current value and the minimum current value is greater than a preset difference value.

[0114] The adjustment module 205 is configured to perform current sharing adjustment on the power modules when the difference is greater than the preset difference value.

[0115] In one embodiment, the first monitoring module includes:

[0116] The acquisition sub-module is configured to acquire the DC bus voltage.

[0117] The determination sub-module is configured to determine the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules.

[0118] a first determining sub-module, configured to determine the execution progress of the pre-charging process according to the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules, wherein when the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules is 1, it indicates that the pre-charging is completed.

[0119] In one embodiment, the pre-charging process is as follows:

[0120] When it is detected that the high-voltage DC bus of the vehicle needs to be pre-charged, an initial low voltage is output to the DC bus by the battery connected to the power module, and the initial low voltage is boosted by the power module;

[0121] During the boosting process, the output current of the power module is controlled to decrease with the increase of the bus voltage;

[0122] When the high-voltage side voltage of the power module is equal to the DC bus voltage, a trickle current is used to maintain the constant of the bus voltage.

[0123] In one embodiment, the device further comprises:

[0124] a third monitoring module, configured to monitor the voltage of the battery connected to the power module after the pre-charging is completed;

[0125] a control module, configured to control the output current of the battery to decrease with the decrease of the output voltage of the battery when the output voltage of the battery decreases;

[0126] a stopping module, configured to stop the output current when the output voltage of the battery decreases to a minimum limit value of the output voltage.

[0127] In one embodiment, the power module corresponding to the minimum current value is a first power module, and the power module corresponding to the maximum current value is a second power module, and the adjusting module comprises:

[0128] a raising sub-module, configured to raise the voltage of the first power module by a preset step when the voltage of the first power module is less than a first preset value;

[0129] a second determining sub-module, configured to determine that the current equalization adjustment of the first power module and the second power module is completed when the current difference between the first power module and the second power module is less than a preset difference value, and the voltage of the first power module is still less than or equal to the first preset value.

[0130] In one embodiment, the device further comprises:

[0131] The decreasing submodule is configured to decrease the voltage of the second power module by a preset step when the voltage of the first power module increases to a first preset value and the current difference between the first power module and the second power module is still greater than the preset difference value, until the current difference between the first power module and the second power module is less than the preset difference value.

[0132] In one embodiment, the determining module is further configured to:

[0133] When the current sharing adjustment of the power modules is completed, the difference between the maximum current value and the minimum current value of the plurality of power modules is continuously determined, and when the difference is greater than the preset difference value, the current sharing adjustment of the power modules is continuously performed.

[0134] FIG. 3 is a schematic diagram of a hardware structure of a current control system according to an embodiment of the present application. As shown in FIG. 3, the current control system includes:

[0135] at least one processor 320; and

[0136] a memory 304 connected with the at least one processor 320; wherein

[0137] The memory 304 stores instructions executable by the at least one processor 320, and the instructions are executed by the at least one processor 320 to implement the current control method described in any of the above embodiments.

[0138] Referring to FIG. 3, the current control system 300 can include one or more of the following components: a processing component 302, a memory 304, a power supply component 306, a multimedia component 308, an audio component 310, an input / output (I / O) interface 312, a sensor component 314, and a communication component 316.

[0139] The processing component 302 usually controls the overall operation of the current control system 300. The processing component 302 can include one or more processors 320 to execute instructions to complete all or part of the steps of the above methods. In addition, the processing component 302 can include one or more modules to facilitate interaction between the processing component 302 and other components. For example, the processing component 302 can include a multimedia module to facilitate interaction between the multimedia component 308 and the processing component 302.

[0140] The memory 304 is configured to store various types of data to support the operations of the current control system 300. Examples of such data include instructions for any application programs or methods operating on the current control system 300, such as text, pictures, videos, etc. The memory 304 can be implemented by any type of volatile or nonvolatile storage devices, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic or optical disks.

[0141] The power supply component 306 supplies power for the various components of the current control system 300. The power supply component 306 can include a power supply management system, one or more power supplies, and other components associated with generating, managing and distributing power for the current control system 300.

[0142] The multimedia component 308 includes a screen providing an output interface between the current control system 300 and the user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, swiping and gestures on the touch panel. The touch sensor can not only sense the boundary of the touch or swiping action, but also detect the duration and pressure associated with the touch or swiping operation. In some embodiments, the multimedia component 308 can also include a front-facing camera and / or a rear-facing camera. The front-facing camera and / or the rear-facing camera can receive external multimedia data when the current control system 300 is in an operation mode, such as a photographing mode or a video mode. Each of the front-facing camera and the rear-facing camera can be a fixed optical lens system or have a focal length and optical zoom capability.

[0143] The audio component 310 is configured to output and / or input audio signals. For example, the audio component 310 includes a microphone (MIC) configured to receive external audio signals when the current control system 300 is in an operation mode, such as an alarm mode, a recording mode, a voice recognition mode and a voice output mode. The received audio signals can be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, the audio component 310 also includes a speaker for outputting audio signals.

[0144] The I / O interface 312 provides an interface between the processing component 302 and peripheral interface modules, which can be a keyboard, a click wheel, a button, etc. These buttons can include, but are not limited to, a home button, a volume button, a start button and a lock button.

[0145] The sensor assembly 314 includes one or more sensors for providing status assessments of various aspects of the current control system 300. For example, the sensor assembly 314 can include a sound sensor. In addition, the sensor assembly 314 can detect the open / close status of the current control system 300, the relative positioning of components, such as a display and keypad of the current control system 300, the operational status of the current control system 300 or a component of the current control system 300, such as the operational status of a plenum, the structural status, the operational status of a discharge blade, etc., the orientation or acceleration / deceleration of the current control system 300, and temperature changes of the current control system 300. The sensor assembly 314 can include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 314 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 314 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, a material pile thickness sensor, or a temperature sensor.

[0146] The communication assembly 316 is configured to enable the current control system 300 to provide wired or wireless communication capabilities with other devices and cloud platforms. The current control system 300 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an example embodiment, the communication assembly 316 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an example embodiment, the communication assembly 316 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0147] In an example embodiment, the current control system 300 can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements for performing the current control method as described in any of the embodiments above.

[0148] The present application also provides a computer-readable storage medium, when the instructions in the storage medium are executed by a processor corresponding to the current control system, the current control system is enabled to implement the current control method as described in any of the embodiments above.

[0149] Those skilled in the art will appreciate that embodiments of the present application can be readily used as software, hardware, or a combination of software and hardware. In a software embodiment, various elements are implemented in hardware, firmware, or software, or combinations thereof. In embodiments implemented in software, the functions can be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media can be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired computer program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or other

[0150] The present application is described in reference to the drawings, which are as follows:

[0151] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.

[0152] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.

[0153] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A current control method characterized by, The method comprises the following steps: monitoring the progress of the pre-charging process during the pre-charging process; monitoring the currents corresponding to the plurality of power modules when the progress of the pre-charging process indicates that the pre-charging is completed; obtaining the maximum current value and the minimum current value among the plurality of power modules; determining whether the difference between the maximum current value and the minimum current value is greater than a preset difference value; adjusting the current sharing of the power modules when the difference is greater than the preset difference value.

2. The method of claim 1, wherein, The monitoring of the progress of the pre-charging process comprises the following steps: obtaining the DC bus voltage; determining the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules; determining the progress of the pre-charging process according to the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules, wherein when the ratio of the DC bus voltage to the high-voltage side voltage of the plurality of power modules is 1, it indicates that the pre-charging is completed.

3. The method of claim 1, wherein, The pre-charging process comprises the following steps: when it is detected that the high-voltage DC bus of the vehicle needs to be pre-charged, outputting an initial low voltage to the DC bus through a battery pack connected to the power modules, and boosting the initial low voltage through the power modules; during the boosting process, controlling the output current of the power modules to decrease with the increase of the bus voltage; when the high-voltage side voltage of the power modules is equal to the DC bus voltage, maintaining the constant of the bus voltage by using a trickle current.

4. The method of claim 1, wherein, The method further comprises the following steps: after the pre-charging is completed, monitoring the voltage of the battery connected to the power modules; when the output voltage of the battery decreases, controlling the output current of the battery to decrease with the decrease of the output voltage of the battery; when the output voltage of the battery decreases to the minimum limit value of the output voltage, stopping the output current.

5. The method of claim 1, wherein, The power module corresponding to the minimum current value is a first power module, and the power module corresponding to the maximum current value is a second power module. The current sharing adjustment of the power modules comprises the following steps: when the voltage of the first power module is less than a first preset value, increasing the voltage of the first power module by a preset step; when the current difference between the first power module and the second power module is less than the preset difference value, and the voltage of the first power module is still less than or equal to the first preset value, it is determined that the current sharing adjustment of the first power module and the second power module is completed.

6. The method of claim 5, wherein, The method further comprises the following steps: when the voltage of the first power module increases to the first preset value, and the current difference between the first power module and the second power module is still greater than the preset difference value, decreasing the voltage of the second power module by a preset step until the current difference between the first power module and the second power module is less than the preset difference value.

7. The method of claim 1, wherein, The method further comprises the following steps: when the current sharing adjustment of the power modules is completed, continuously determining whether the difference between the maximum current value and the minimum current value of the plurality of power modules is greater than the preset difference value, and continuously adjusting the current sharing of the power modules when the difference is greater than the preset difference value.

8. A current control device, characterized by, The method comprises the following steps: a first monitoring module is configured to monitor the progress of the pre-charging process during the pre-charging process; a second monitoring module is configured to monitor the currents corresponding to the plurality of power modules when the progress of the pre-charging process indicates that the pre-charging is completed; an obtaining module is configured to obtain the maximum current value and the minimum current value among the plurality of power modules; a determining module is configured to determine whether the difference between the maximum current value and the minimum current value is greater than a preset difference value; The adjusting module is configured to perform current sharing adjustment on the power module when the difference is greater than the preset difference.

9. A current control system characterized by, The method comprises: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the current control method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor corresponding to the current control system, the current control system can implement the current control method according to any one of claims 1-7.

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