Current control method, device and system and storage medium

Abstract

The invention discloses a current control method, device and system and a storage medium, which are used for solving the problem that the output current of a plurality of power supply modules is unbalanced. The method comprises the following steps: 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 the pre-charging is completed, monitoring current corresponding to the plurality of power supply modules; obtaining a maximum current value and a minimum current value in the plurality of power supply modules; judging whether a difference value between the maximum current value and the minimum current value is greater than a preset difference value or not; and when the difference value is greater than the preset difference value, performing current-sharing adjustment on the power module. By adopting the scheme, the condition that the output current of a plurality of power supply modules is unbalanced can be avoided, so that the service life of the power supply modules is prolonged.

Description

Technical Field

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

[0002] With the popularity of new energy vehicles such as electric vehicles and hybrid vehicles, power modules, as the core components of high-low voltage conversion, have become an indispensable part of their power systems. When the vehicle starts, the low-voltage electricity is mainly powered by the low-voltage battery. After the power battery pack is powered on, the power 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 power the low-voltage electrical equipment of the entire vehicle; when the low-voltage battery voltage is detected to be insufficient, the power module charges the low-voltage battery.

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

[0004] Therefore, how to provide a current control method to avoid the imbalance of output currents of multiple power modules and extend the service life of the power modules has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present application provides a current control method, device, system and storage medium, which are used to avoid the situation where the output current of multiple power modules is unbalanced, thereby extending the service life of the power modules.

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

[0007] During the pre-charging process, monitoring the execution progress of the pre-charging process;

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

[0009] Obtain the maximum current value and the minimum current value in multiple power modules;

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

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

[0012] The beneficial effect of the present application is that after pre-charging is completed, the output current of different power modules is monitored in real time, and when the difference between the maximum current value and the minimum current value in multiple power modules is greater than a preset difference, the power modules are adjusted for current balancing, so that the output current of each power module is maintained within the preset difference range, so that the output current of each power module remains basically consistent, avoiding the problem of unbalanced output current of multiple power modules, thereby extending the service life of the power modules.

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

[0014] Get the DC bus voltage;

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

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

[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 a battery pack connected to the power module, and the initial low voltage is boosted by the power module;

[0019] During the voltage boost process, the output current of the power module is controlled to decrease as the bus voltage increases;

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

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

[0022] After the pre-charging is completed, monitoring the voltage of the storage battery connected to the power module;

[0023] When the output voltage of the battery drops, the output current of the battery is controlled to drop along with the drop of the output voltage of the battery;

[0024] When the output voltage of the battery drops to the minimum output voltage limit, the output current stops.

[0025] In one embodiment, the power module corresponding to the minimum current value is the first power module, and the power module corresponding to the maximum current value is the second power module, and the current balancing adjustment of the power modules includes:

[0026] When the voltage of the first power module is less than a first preset value, increasing the voltage of the first power module according to a preset step length;

[0027] When the current difference between the first power module and the second power module is less than the preset difference, 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.

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

[0029] 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, the voltage of the second power module is reduced according to a preset step until the current difference between the first power module and the second power module is less than the preset difference.

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

[0031] When the current balancing adjustment of the power modules is completed, continue to determine whether the difference between the maximum current value and the minimum current value of the multiple power modules is greater than the preset difference. If it is greater than the preset difference, continue to adjust the current balancing of the power modules.

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

[0033] A first monitoring module, used for monitoring the execution progress of the pre-charging process during the pre-charging process;

[0034] A second monitoring module is used to monitor the currents corresponding to the multiple power modules when the execution progress of the pre-charging process indicates that the pre-charging is completed;

[0035] An acquisition module, used for acquiring maximum current value and minimum current value in multiple power modules;

[0036] A judging module, used to judge whether the difference between the maximum current value and the minimum current value is greater than a preset difference;

[0037] The adjustment module is used to adjust the current sharing of the power module when the difference is greater than a preset value.

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

[0039] An acquisition submodule is used to acquire the DC bus voltage;

[0040] A judgment submodule, used to judge the ratio of the DC bus voltage to the high-voltage side voltages of multiple power modules;

[0041] The first determination submodule is used to determine the execution progress of the pre-charging process according to the ratio of the DC bus voltage to the high-voltage side voltages of multiple power modules, wherein when the ratio of the DC bus voltage to the high-voltage side voltages of multiple 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 through a battery pack connected to the power module, and the initial low voltage is boosted by the power module;

[0044] During the voltage boost process, the output current of the power module is controlled to decrease as the bus voltage increases;

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

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

[0047] A third monitoring module, used for monitoring the voltage of the battery connected to the power module after the pre-charging is completed;

[0048] The control module is used for controlling the battery output current to decrease as the battery output voltage decreases when the battery output voltage decreases;

[0049] The stop module is used to stop the output current when the output voltage of the battery drops to the minimum limit of the output voltage.

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

[0051] A boost submodule, used to boost the voltage of the first power module according to a preset step length when the voltage of the first power module is less than a first preset value;

[0052] The second determination submodule is used to determine that the current sharing 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 and the voltage of the first power module is still less than or equal to a first preset value.

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

[0054] A reduction submodule is used to reduce the voltage of the second power module according to a preset step size 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, until the current difference between the first power module and the second power module is less than the preset difference.

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

[0056] When the current balancing adjustment of the power modules is completed, continue to determine whether the difference between the maximum current value and the minimum current value of the multiple power modules is greater than the preset difference. If it is greater than the preset difference, continue to adjust the current balancing of the power modules.

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

[0058] at least one processor; and,

[0059] a memory communicatively connected to the at least one processor; wherein,

[0060] The memory stores instructions that can be executed 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 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 can implement the current control method recorded in any of the above embodiments.

[0062] Other features and advantages of the present application will be described in the subsequent description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings.

[0063] The technical solution of the present application is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0065] Figure 1 This is a flow chart of a current control method in one embodiment of the present application;

[0066] Figure 2 This is a schematic diagram of the structure of a current control device in one embodiment of the present application;

[0067] Figure 3 Schematic diagram of the hardware structure of a current control system in one embodiment of the present application. DETAILED DESCRIPTION

[0068] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

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

[0070] Figure 1 Flow chart of a current control method in one embodiment of the present application. Figure 1 As shown, 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, currents corresponding to the multiple power modules are monitored;

[0073] In step S103, the maximum current value and the minimum current value in the multiple 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;

[0075] In step S105, when the difference is greater than a preset value, current sharing adjustment is performed on the power module.

[0076] In the present application, during the pre-charging process, the execution progress of the pre-charging process is monitored. Pre-charging is to prevent the high-voltage circuit from generating sparks and high temperatures at the moment of contact during charging or discharging, which may damage the electrical appliances. Specifically, there may be a variety of methods to determine the execution progress of the pre-charging process, such as monitoring the bus voltage to reach a certain value, the pre-charging time to reach a preset duration, etc. In one 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 voltages of multiple power modules. During the pre-charging process, the DC bus voltage is obtained, for example, by means of a resistor voltage division method and an optical coupling isolation method. Then the ratio of the DC bus voltage to the high-voltage side voltages of multiple power modules is determined. When it is detected that the high-voltage DC bus of the vehicle needs to be pre-charged, the battery pack connected to the power module outputs an initial low voltage to the DC bus, and the initial low voltage is boosted by the power module. For example, by raising the voltage of the low-voltage 24V of the battery to a high-voltage DC bus of 400V-1200V through a boosting method, 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 voltages of the multiple power modules, wherein the pre-charging is completed when the ratio of the DC bus voltage to the high-voltage side voltages of the multiple power modules is 1.

[0077] When the execution progress of the pre-charging process indicates that the pre-charging is completed, the currents corresponding to the multiple 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 can proceed to the next step. Since the power modules may differ in actual work, their output currents may be different. Therefore, after the pre-charging is completed, the currents corresponding to the multiple power modules are monitored to understand the output of each power module and detect the current imbalance in time.

[0078] Get the maximum and minimum current values ​​of multiple power modules. The maximum and minimum current values ​​reflect the extremes of the current differences between the power modules. By comparing these two values, you can quickly determine the degree of current imbalance. Therefore, compare the output currents of multiple monitored power modules to find the maximum and minimum values.

[0079] Determine whether the difference between the maximum current value and the minimum current value is greater than the preset difference. The preset difference is a threshold value determined according to system requirements and actual experience, which represents an acceptable degree of current imbalance. If the difference between the maximum current value Imax and the minimum current value Imin is less than the preset difference, it means 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, current balancing adjustment is required. For example, if the preset difference is set to 5A, then when Imax-Imin≥5A, current balancing adjustment is started; when Imax-Imin≤5A, no current balancing adjustment is performed.

[0080] When it is greater than the preset difference, the power module is adjusted for current sharing. The goal of current sharing adjustment is to make the output currents of each power module as close as possible to ensure the stable operation of the system. Through current sharing adjustment, the reliability and efficiency of the power system can be improved and the service life of the power module can be extended. For example, the power module corresponding to the minimum current value Imin is defined as the first power module, and the power module corresponding to the maximum current value is defined as the second power module. When the voltage of the first power module is less than the first preset value, the voltage of the first power module is increased according to the preset step size. For example, if the maximum output voltage of the power module is set not to exceed 110% of the rated output power Va, the first preset value can be set to Va×110%. Therefore, when Imax-Imin≥5A, current sharing adjustment begins. 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 increase step size is 0.1~1V, so that the output port voltage of the first power module begins to increase, and the output current of the first power module gradually increases. During the voltage boost 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, 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, the voltage of the second power module is reduced according to the preset step until the current difference between the first power module and the second power module is less than the preset difference. For example, when Imax-Imin≥5A, and Vref1=Va×110%, the voltage Vref2 reference of the second power module is controlled to start decreasing at this time, and the step size is 0.1~1V; as the voltage of the second power module begins to decrease, the output current of the second power module begins to decrease, and when Imax-Imin≤5A, the current sharing control strategy is stopped. In one embodiment of the present application, the minimum value range of the second power supply module can also be set, and then the value range of the second power supply module can be determined. For example, the value range is (90%×Va)≤Vref≤(Va×110%). When the power supply of the second power supply module drops to the minimum value, the second power supply module is no longer controlled to drop, and the output voltages of other power supply modules are adjusted to achieve current balance.

[0081] It can be understood that in order to continuously achieve current balancing control of the power supply, when the current balancing adjustment of the power supply module is completed, continue to determine whether the difference between the maximum current value and the minimum current value of multiple power supply modules is greater than the preset difference. When it is greater than the preset difference, continue to adjust the current balancing of the power supply module.

[0082] In one embodiment of the present application, in order to ensure the safe and stable operation of the battery and the entire system, after the pre-charging is completed, the voltage of the battery connected to the power module is monitored; by continuously monitoring the battery voltage, the working status of the battery is timely understood. If the battery voltage fluctuates abnormally or drops too fast, it may mean that there are problems in the system, such as excessive load, power module failure, or degradation of the battery itself. Timely discovery of these problems can take corresponding measures to ensure the stable operation of the entire system. When the output voltage of the battery drops, the output current of the battery is controlled to drop as the output voltage of the battery drops; as the output voltage of the battery drops, its remaining power is also reduced. If the output current is not controlled, the battery may be over-discharged, thereby damaging the battery. By making the output current drop as the output voltage drops, the battery can be protected to a certain extent to avoid over-discharge. When the output voltage of the battery drops to the minimum limit of the output voltage, the output current is stopped. The minimum limit of the output voltage is usually determined according to the characteristics and design requirements of the battery. When the output voltage drops to this limit, continuing to output the 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 bus charging, the rated voltage Vrbat and the battery voltage Vbat are monitored in real time, and the minimum battery voltage is set to Vbat_min, △Vbat=(Vrbat-Vbat_min), when the battery voltage drops to 50%×△Vbat+Vbat_min, the output current is adjusted to drop to 50%×Ibmax, when the battery voltage drops to 80%×△Vbat+Vbat_min, the output current is adjusted to drop to 20%×Ibmax, and when the battery voltage drops to Vbat_min, the output is stopped. Of course, it can also refer to other ways in which the output current drops as the voltage drops, which will not be expanded in this application.

[0083] Through the solution provided in the present application, when multiple power supplies are working, the output current of each power supply can be accurately balanced, so that the output current of each power supply can be maintained within a certain range. At the same time, the risk of thermal runaway of internal components caused by power imbalance between devices is reduced, thereby increasing the service life of the power supply.

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

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

[0086] In step A1, a DC bus voltage is obtained;

[0087] In step A2, the ratio of the DC bus voltage to the high-voltage side voltages 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 voltages of multiple power modules, wherein the pre-charging is completed when the ratio of the DC bus voltage to the high-voltage side voltages of multiple power modules is 1.

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

[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 a battery pack connected to the power module, and the initial low voltage is boosted by the power module;

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

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

[0093] The vehicle's power supply system includes components such as battery packs, power modules, and DC busbars. Among them, the battery pack is the vehicle's main energy storage device, providing power for the entire vehicle system. The battery stores electrical energy through the charging process. The power module is the core component that completes the high-low voltage conversion. When the vehicle starts, the low-voltage electricity is mainly powered by the low-voltage battery. After the power battery pack is powered on, the battery pack inputs the high-voltage direct current to the power module through the high-voltage distribution system; the power module converts the high-voltage direct current into low-voltage direct current to power the low-voltage electrical equipment of the entire vehicle; when the low-voltage battery voltage is detected to be insufficient, the power module charges the low-voltage battery. The DC bus is an important channel for vehicle power transmission, used to connect batteries, power modules, and various electrical appliances. The DC bus is responsible for efficiently transmitting the electrical energy provided by the battery to each electrical appliance.

[0094] In order to prevent damage to electrical appliances due to sparks and high temperatures generated by high-voltage circuits at the moment of contact during charging or discharging, the present application performs pre-charging before charging or discharging the vehicle to allow the voltage to increase slowly to avoid shock to the electrical appliances.

[0095] When it is detected that the vehicle's high-voltage DC bus needs to be pre-charged, the battery pack connected to the power module outputs an initial low voltage to the DC bus, and the power module boosts the initial low voltage. For example, when the vehicle's high-voltage DC bus needs to be pre-charged, the bidirectional DCDC power module gradually raises the voltage of the battery's low voltage 24V to the 400V-1200V high-voltage DC bus through a boosting method to pre-charge the DC bus.

[0096] During the boost 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, the current in the circuit may be too large and damage the circuit. Therefore, in the present application, the output current is reduced as the bus voltage increases to avoid the occurrence of overcurrent. At the same time, the entire system can maintain relatively stable operation under different working conditions. There are many specific ways to reduce, for example, setting the bus voltage to Vbus, the maximum output current value to Ibmax, then monitoring the high-voltage side voltage Vhout of the power module, when the Vhout voltage rises to 50% × Vbus, adjust the output current Ib to 50% × Ibmax; when the Vhout voltage rises to 80% × Vbus, adjust the output current Ib to 20% × Vbus. Of course, the corresponding relationship between the increase in bus power supply and the decrease in the output current of the power module can also be pre-set to smoothly reduce the current, which is not specifically expanded in this application.

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

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

[0099] In step C1, after pre-charging is completed, the voltage of the storage 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 drops to the output voltage minimum limit value, the output current is stopped.

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

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

[0104] In step D2, when the current difference between the first power module and the second power module is less than the preset difference, 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 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, the voltage of the second power module is reduced according to a preset step size until the current difference between the first power module and the second power module is less than the preset difference.

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

[0108] When the current balancing adjustment of the power modules is completed, continue to determine whether the difference between the maximum current value and the minimum current value of the multiple power modules is greater than the preset difference. If it is greater than the preset difference, continue to adjust the current balancing of the power modules.

[0109] Figure 2 Schematic diagram of the structure of a current control device in one embodiment of the present application. Figure 2 As shown, the device comprises:

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

[0111] A second monitoring module 202 is used to monitor the currents corresponding to the multiple power modules when the execution progress of the pre-charging process indicates that the pre-charging is completed;

[0112] An acquisition module 203 is used to acquire a maximum current value and a minimum current value in a plurality of power modules;

[0113] A determination module 204 is used to determine whether the difference between the maximum current value and the minimum current value is greater than a preset difference;

[0114] The adjustment module 205 is used to adjust the current sharing of the power supply module when the difference is greater than a preset difference.

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

[0116] An acquisition submodule is used to acquire the DC bus voltage;

[0117] A judgment submodule, used to judge the ratio of the DC bus voltage to the high-voltage side voltages of multiple power modules;

[0118] The first determination submodule is used to determine the execution progress of the pre-charging process according to the ratio of the DC bus voltage to the high-voltage side voltages of multiple power modules, wherein when the ratio of the DC bus voltage to the high-voltage side voltages of multiple 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 through a battery pack connected to the power module, and the initial low voltage is boosted by the power module;

[0121] During the voltage boost process, the output current of the power module is controlled to decrease as the bus voltage increases;

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

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

[0124] A third monitoring module, used for monitoring the voltage of the battery connected to the power module after the pre-charging is completed;

[0125] The control module is used for controlling the battery output current to decrease as the battery output voltage decreases when the battery output voltage decreases;

[0126] The stop module is used to stop the output current when the output voltage of the battery drops to the minimum limit of the output voltage.

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

[0128] A boost submodule, used to boost the voltage of the first power module according to a preset step length when the voltage of the first power module is less than a first preset value;

[0129] The second determination submodule is used to determine that the current sharing 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 and the voltage of the first power module is still less than or equal to a first preset value.

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

[0131] A reduction submodule is used to reduce the voltage of the second power module according to a preset step size 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, until the current difference between the first power module and the second power module is less than the preset difference.

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

[0133] When the current balancing adjustment of the power modules is completed, continue to determine whether the difference between the maximum current value and the minimum current value of the multiple power modules is greater than the preset difference. If it is greater than the preset difference, continue to adjust the current balancing of the power modules.

[0134] Figure 3 FIG. 1 is a schematic diagram of the hardware structure of a current control system in an embodiment of the present application. Figure 3 As shown, the current control system comprises:

[0135] at least one processor 320; and,

[0136] A memory 304 in communication with the at least one processor 320; wherein,

[0137] The memory 304 stores instructions that can be executed 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] Reference Figure 3 , the current control system 300 may include one or more of the following components: a processing component 302 , a memory 304 , a power 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 generally controls the overall operation of the current control system 300. The processing component 302 may include one or more processors 320 to execute instructions to complete all or part of the steps of the above method. In addition, the processing component 302 may include one or more modules to facilitate the interaction between the processing component 302 and other components. For example, the processing component 302 may include a multimedia module to facilitate the 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 operation of the current control system 300. Examples of such data include instructions for any application or method 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 non-volatile storage device 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 memory, flash memory, magnetic disk or optical disk.

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

[0142] The multimedia component 308 includes a screen that provides an output interface between the current control system 300 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may 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, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 308 may also include a front camera and / or a rear camera. When the current control system 300 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each front camera and rear camera may 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), and 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 microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 304 or sent via the communication component 316. In some embodiments, the audio component 310 also includes a speaker for outputting audio signals.

[0144] I / O interface 312 provides an interface between processing component 302 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may 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 various aspects of status assessment for the current control system 300. For example, the sensor assembly 314 may include a sound sensor. In addition, the sensor assembly 314 may detect the on / off state of the current control system 300, the relative positioning of components, such as the display and keypad of the current control system 300, and the sensor assembly 314 may also detect the operating state of the current control system 300 or a component of the current control system 300, such as the operating state of the air distribution plate, the structural state, the operating state of the discharge scraper, etc., the orientation or acceleration / deceleration of the current control system 300 and the temperature change of the current control system 300. The sensor assembly 314 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 314 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 314 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, a material stack thickness sensor or a temperature sensor.

[0146] The communication component 316 is configured to enable the current control system 300 to provide the ability to communicate with other devices and cloud platforms in a wired or wireless manner. 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 exemplary embodiment, the communication component 316 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 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 exemplary 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, microcontrollers, microprocessors or other electronic components to execute the current control method described in any of the above embodiments.

[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 can implement the current control method recorded in any of the above embodiments.

[0149] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0150] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0151] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0152] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0153] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A current control method, characterized in that: include: During the pre-charging process, monitoring the execution progress of the pre-charging process; When the execution progress of the pre-charging process indicates that the pre-charging is completed, currents corresponding to the plurality of power modules are monitored; Obtain the maximum current value and the minimum current value in multiple power modules; Determine whether the difference between the maximum current value and the minimum current value is greater than a preset difference; When the difference is greater than the preset value, the power module is adjusted for current sharing.

2. The method according to claim 1, characterized in that The monitoring of the execution progress of the pre-charging process includes: Get the DC bus voltage; Determine the ratio of the DC bus voltage to the high-voltage side voltages of multiple power modules; The execution progress of the pre-charging process is determined according to the ratio of the DC bus voltage to the high-voltage side voltages of the multiple power modules, wherein the pre-charging is completed when the ratio of the DC bus voltage to the high-voltage side voltages of the multiple power modules is 1.

3. The method according to claim 1, characterized in that The pre-charging process is as follows: 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 a battery pack connected to the power module, and the initial low voltage is boosted by the power module; During the voltage boost process, the output current of the power module is controlled to decrease as the bus voltage increases; When the voltage on the high-voltage side of the power module is equal to the DC bus voltage, trickle current is used to maintain the bus voltage constant.

4. The method according to claim 1, characterized in that The method further comprises: After the pre-charging is completed, monitoring the voltage of the storage battery connected to the power module; When the output voltage of the battery drops, the output current of the battery is controlled to drop along with the drop of the output voltage of the battery; When the output voltage of the battery drops to the minimum output voltage limit, the output current stops.

5. The method according to claim 1, characterized in that The power module corresponding to the minimum current value is the first power module, and the power module corresponding to the maximum current value is the second power module. The current balancing adjustment of the power modules includes: When the voltage of the first power module is less than a first preset value, increasing the voltage of the first power module according to a preset step length; When the current difference between the first power module and the second power module is less than the preset difference, 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 according to claim 5, characterized in that The method further comprises: 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, the voltage of the second power module is reduced according to a preset step until the current difference between the first power module and the second power module is less than the preset difference.

7. The method according to claim 1, characterized in that The method further comprises: When the current balancing adjustment of the power modules is completed, continue to determine whether the difference between the maximum current value and the minimum current value of the multiple power modules is greater than the preset difference. If it is greater than the preset difference, continue to adjust the current balancing of the power modules.

8. A current control device, characterized in that: include: A first monitoring module, used for monitoring the execution progress of the pre-charging process during the pre-charging process; A second monitoring module is used to monitor the currents corresponding to the multiple power modules when the execution progress of the pre-charging process indicates that the pre-charging is completed; An acquisition module, used for acquiring maximum current value and minimum current value in multiple power modules; A judging module, used to judge whether the difference between the maximum current value and the minimum current value is greater than a preset difference; The adjustment module is used to adjust the current sharing of the power module when the difference is greater than a preset value.

9. A current control system, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed 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 to 7.

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

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