Over-limit output control method of charging circuit and related device

Abstract

The application discloses a method for controlling over-limit output of a charging circuit and related devices. The method comprises: detecting that the charging circuit is currently in an over-limit output mode, determining a next time temperature of each detection point in a plurality of detection points; determining a reference remaining time of each detection point in the over-limit output mode according to a real-time temperature, the next time temperature and a temperature difference value of each detection point; determining a cumulative running time of the over-limit output mode according to a first over-limit time of a current current segment and / or a second over-limit time of at least one previous current segment; and determining a remaining working time of the charging circuit in the over-limit output mode according to the reference remaining time, the cumulative running time and a safety time threshold of the current current segment. The application can maximize the power output of the charging circuit within a safety boundary, and improve the charging efficiency and power utilization rate.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to an over-limit output control method and related device for a charging circuit. Background Technology

[0002] Currently, electric vehicles are being used more and more widely, and their power battery packs need to be charged using charging stations. With the development of electric vehicles, the charging power of charging stations is constantly increasing. However, with the rapid increase in charging power, traditional charging methods and their control designs are finding it increasingly difficult to find a suitable balance between charging rate and charging temperature rise. This leads to a dilemma where the two are in a binary opposition and difficult to balance, seriously hindering charging efficiency and affecting user experience. Summary of the Invention

[0003] This application provides a method and related apparatus for controlling the over-limit output of a charging circuit, so as to maximize the power output of the charging circuit within the safety boundary and improve charging efficiency and power utilization.

[0004] In a first aspect, embodiments of this application provide an over-limit output control method for a charging circuit, including:

[0005] The charging circuit is detected to be in over-limit output mode. The temperature of each of the multiple detection points at the next moment is determined. The over-limit output mode is used to indicate the operating status of the charging circuit's operating current within the range of rated current and maximum allowable output current.

[0006] Based on the real-time temperature of each detection point, the temperature at the next moment, and the temperature difference, a reference remaining time for each detection point to exceed the limit is determined, where the temperature difference is the difference between the real-time temperature and the warning temperature.

[0007] The cumulative running time of the over-limit output mode is determined based on the first over-limit time of the current current segment and / or the second over-limit time of at least one preceding current segment. The second over-limit time is the sum of at least one conversion time. A single conversion time is obtained by converting the over-limit time of a single preceding current segment according to the safety time threshold of the current current segment.

[0008] The remaining operating time of the charging circuit in the over-limit output mode is determined based on the reference remaining time, the cumulative operating time, and the safe time threshold of the current segment.

[0009] The detection that the charging circuit is currently in an over-limit output mode, and the determination of the temperature at the next moment for each of the multiple detection points, includes:

[0010] The real-time temperature, heat capacity, and heat dissipation coefficient of each detection point are obtained;

[0011] Determine the thermal conduction coupling coefficient between each detection point;

[0012] The temperature change at each detection point is determined based on the thermal conduction coupling coefficient, the heat dissipation coefficient, and the heat capacity.

[0013] The temperature at the next moment is determined based on the real-time temperature and the temperature change.

[0014] The step of determining the temperature change at each detection point based on the thermal conductivity coupling coefficient, the heat dissipation coefficient, and the heat capacity includes:

[0015] Based on the real-time temperature, the thermal conduction coupling coefficient, and the heat dissipation coefficient, determine the heat dissipation reference power of each detection point under the combined effect of coupled thermal conduction and local cooling;

[0016] Obtain the ambient temperature at each detection point;

[0017] Based on the heat dissipation coefficient, determine the heat dissipation reference power for the ambient temperature;

[0018] The heating power of each detection point is determined based on the real-time current at each detection point.

[0019] The thermal deviation power is obtained based on the heat dissipation reference power, the heat dissipation reference power, and the heat generation power;

[0020] The temperature change is determined based on the heat capacity, time step, and thermal deviation power.

[0021] The step of determining the remaining operating time of the charging circuit in the over-limit output mode based on the reference remaining time, the cumulative operating time, and the safe time threshold of the current segment includes:

[0022] If the cumulative running time is detected to be greater than or equal to the safe time threshold of the current current segment, the charging circuit is controlled to exit the over-limit output mode.

[0023] If the cumulative running time is detected to be less than the safe time threshold of the current current segment, it is determined whether the target remaining time is less than the preset threshold. The target remaining time is the minimum value among the reference remaining times that can be exceeded by each detection point.

[0024] If the remaining time of the target is less than the preset threshold, then the charging circuit is controlled to exit the over-limit output mode;

[0025] If the target remaining time is greater than or equal to the preset threshold, the target remaining time and the cumulative running time are merged to obtain a reference safe running time;

[0026] The remaining operating time is determined based on the reference safe operating time and the safe time threshold of the current current segment.

[0027] The step of determining the remaining operating time based on the reference safe operating time and the safe time threshold of the current current segment includes:

[0028] If the reference safe operating time is greater than the safe operating time threshold of the current current segment, then the remaining operating time is determined based on the safe operating time threshold of the current current segment and the cumulative operating time.

[0029] If the reference safe operating time is less than or equal to the safe time threshold of the current current segment, then the target remaining time is determined as the remaining working time.

[0030] Before detecting that the charging circuit is currently in an over-limit output mode and determining the temperature of each of the multiple detection points at the next moment, the method further includes:

[0031] The current limit for each detection point is determined based on the real-time temperature of each detection point.

[0032] If the real-time current at each detection point is detected to be less than the current limit, it is determined whether multiple over-limit output conditions are met. These multiple over-limit output conditions include temperature constraints, cooling constraints, current demand constraints, and power constraints.

[0033] If the above multiple over-limit output conditions are met, then the over-limit output mode is entered;

[0034] If the multiple over-limit output conditions are not met, then the current limiting output action is performed on each detection point according to the minimum value among the current limits of each detection point.

[0035] The step of determining the reference remaining time for each detection point to exceed the output limit based on the real-time temperature of each detection point, the temperature at the next moment, and the temperature difference includes:

[0036] The rate of temperature change is determined based on the real-time temperature and the temperature at the next moment.

[0037] The reference remaining time is determined based on the temperature change rate and the temperature difference.

[0038] Secondly, embodiments of this application provide an over-limit output control device for a charging circuit, comprising:

[0039] The first determining unit is used to detect that the charging circuit is currently in the over-limit output mode and determine the temperature of each of the multiple detection points at the next moment. The over-limit output mode is used to indicate the operating status of the charging circuit's operating current within the range of rated current and maximum allowable output current.

[0040] The second determining unit is used to determine the reference remaining time for each detection point to exceed the limit output based on the real-time temperature of each detection point, the temperature at the next moment, and the temperature difference, wherein the temperature difference is the difference between the real-time temperature and the warning temperature.

[0041] The third determining unit is used to determine the cumulative running time of the over-limit output mode based on the first over-limit time of the current current segment and / or the second over-limit time of at least one preceding current segment. The second over-limit time is the sum of at least one conversion time, and the single conversion time is obtained by converting the over-limit time of a single preceding current segment based on the safety time threshold of the current current segment.

[0042] The fourth determining unit is used to determine the remaining operating time of the charging circuit in the over-limit output mode based on the reference remaining time, the cumulative operating time, and the safe time threshold of the current segment.

[0043] Thirdly, embodiments of this application provide an electronic device, including a memory, a processor, and executable program code stored in the memory and executable on the processor, wherein the processor executes the executable program code and performs the steps of the method described in the first aspect.

[0044] Fourthly, embodiments of this application provide a computer-readable storage medium storing executable program code, the executable program code including execution instructions for performing the steps of the method as described in the first aspect.

[0045] Fifthly, embodiments of this application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps described in the first aspect of embodiments of this application. The computer program product may be a software installation package.

[0046] As can be seen, in this embodiment, the charging circuit is first detected to be in an over-limit output mode, and the temperature at the next moment of each of the multiple detection points is determined. The over-limit output mode is used to indicate the operating state of the charging circuit's working current within the range of rated current and maximum allowable output current. Then, based on the real-time temperature of each detection point, the next moment temperature, and the temperature difference, a reference remaining time for each detection point to exceed the limit is determined. The temperature difference is the difference between the real-time temperature and the warning temperature. Subsequently, based on the first over-limit time of the current current segment and / or the second over-limit time of at least one preceding current segment, the cumulative operating time of the over-limit output mode is determined. The second over-limit time is the sum of at least one conversion time, and a single conversion time is obtained by converting the over-limit time of a single preceding current segment according to the safety time threshold of the current current segment. Finally, based on the reference remaining time, the cumulative operating time, and the safety time threshold of the current current segment, the remaining operating time of the charging circuit in the over-limit output mode is determined.

[0047] This application predicts the temperature of multiple detection points at the next moment and combines the real-time temperature with the temperature difference to determine the remaining time that the multiple detection points can exceed the output limit, protecting the multiple detection points of the charging circuit from overheating damage and achieving proactive prevention and control of temperature risks. It integrates the over-limit time of the current segment with the equivalent over-limit time of the previous current segment to accurately quantify the total over-limit time. Finally, it combines the reference remaining time, the cumulative running time and the current segment safety threshold to determine the remaining working time, which can achieve precise over-limit output protection, enabling the charging circuit to maximize power output within the safety boundary, reduce unnecessary waiting, and improve charging efficiency and power utilization. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This application provides a system architecture diagram of an over-limit output control system according to an embodiment;

[0050] Figure 2 This is a flowchart illustrating an over-limit output control method for a charging circuit provided in an embodiment of this application;

[0051] Figure 3 This is a schematic diagram of the control flow for over-limit protection provided in an embodiment of this application;

[0052] Figure 4This is a flowchart illustrating a method for determining the reference remaining time for detection point i to exceed the output limit, as provided in an embodiment of this application.

[0053] Figure 5 This is a schematic diagram of a charging circuit provided in an embodiment of this application;

[0054] Figure 6 This is a flowchart illustrating another over-limit output control method for a charging circuit provided in an embodiment of this application;

[0055] Figure 7 This is a functional unit block diagram of an over-limit output control device for a charging circuit provided in an embodiment of this application;

[0056] Figure 8 This is a functional unit block diagram of another charging circuit over-limit output control device provided in the embodiments of this application;

[0057] Figure 9 This is a schematic diagram of the structure of an electronic device proposed in an embodiment of this application. Detailed Implementation

[0058] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0059] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0060] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] Currently, electric vehicles are being used more and more widely, and their power battery packs need to be charged using charging stations. With the development of electric vehicles, the rated current of the charging guns used in charging stations is increasing, and the current flowing through components in the entire charging circuit, such as DC contactors, cables, shunts, and fuses, is also increasing. Due to external factors such as deviations in terminal tightening torque, humid and hot environments, and salt spray corrosion, the temperature rise characteristics of various components during charging vary significantly. If only the temperature of the charging gun head is monitored, it is easy to find situations where the gun head temperature is within the normal threshold range, but a component or part of the cable inside the circuit has already overheated. This can lead to safety anomalies such as cable burning and curling, and component overheating failure. This not only poses serious safety hazards to equipment operation but also causes frequent component damage, significantly increasing maintenance costs.

[0062] Furthermore, when the battery is in a low-voltage state, the charging current is forcibly clamped by a preset current-limiting threshold. Even if the current needs to be increased to compensate for the voltage shortfall and maintain full power output during this low-voltage phase, the current cannot exceed the aforementioned current-limiting threshold to achieve adaptive improvement. This directly results in the actual charging power failing to reach the rated full power level of the charging equipment and the vehicle battery, preventing the full release of its power output potential, ultimately leading to redundant and wasted hardware performance and low charging efficiency.

[0063] In conclusion, traditional charging methods and their control designs are finding it increasingly difficult to strike a balance between charging speed and charging temperature rise, resulting in a dilemma where the two are in a binary opposition and difficult to balance, which seriously hinders charging efficiency and affects user experience.

[0064] To address the aforementioned problems, this application provides an over-limit output control method and related apparatus for a charging circuit. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0065] Please see Figure 1 , Figure 1 This is a system architecture diagram of an over-limit output control system provided in an embodiment of this application. For example... Figure 1 As shown, the over-limit output control system 100 includes a temperature detection module 101, a PID control module 102, a current limiting module 103, an over-limit output control module 104, a power regulation module 105, and a data communication module 106.

[0066] The temperature detection module 101 is used to achieve comprehensive temperature monitoring of key areas in the charging circuit. Independent temperature detection points can be placed at locations such as DC contactors, cables, shunts, and fuses to collect temperature data from each point in real time. After preprocessing the data, including filtering and calibration, the data is synchronously transmitted to the PID control module 102. This multi-point distributed detection ensures no blind spots in temperature monitoring, providing reliable raw data support for subsequent precise control.

[0067] The PID control module 102 is used to implement temperature protection and current adaptation. It receives temperature data from various points transmitted by the temperature detection module 101, assigns an independent PID control submodule to each temperature detection point, and performs proportional, integral, and derivative calculations on the deviation between the temperature at each point and the safety threshold, outputting the corresponding current limit reference value for the detection point. Subsequently, through the built-in minimum value filtering logic, the minimum current limit value is extracted from the output values ​​of all PID control submodules and transmitted as the final safe current reference value to the current limiting module 103. Through the above steps, the temperature safety of each detection point is ensured, and the system's carrying capacity is maximized within the safe range, avoiding power waste caused by excessive limitation.

[0068] The current limiting module 103 converts the calculation result of the PID control module 102 into an executable current constraint signal. After receiving the minimum current limit value output by the PID control module 102, it directly uses the PID calculation result as the upper limit of the current for current limiting. At the same time, it monitors the deviation between the actual charging current and the limit value in real time, and ensures that the current is always within the set range through closed-loop feedback to prevent overcurrent risks.

[0069] The over-limit output control module 104 determines whether the preconditions for over-limit output are met. If the preconditions are met, the control module transmits the result to the power adjustment module 105, which then performs the corresponding power output adjustment to achieve short-term high-power output. Furthermore, timing and status monitoring are performed during the over-limit output process. When the preset over-limit duration is reached or an anomaly is detected, the over-limit exit mechanism is immediately triggered to ensure the safety and controllability of the over-limit output.

[0070] The power adjustment module 105 is used to precisely adjust the charging power. Upon receiving a control command from the over-limit output control module 104 to enter the over-limit output mode, it dynamically controls the charging power based on real-time parameters such as temperature and current to achieve short-term high-power output. Upon receiving a control command from the over-limit output control module 104 to exit the over-limit output mode, it initiates a power smoothing transition program, gradually reducing the charging power in a step-by-step derating manner based on real-time temperature data from each temperature detection point, the current charging current value, and the safe current reference value.

[0071] The data communication module 106 is used to realize information interaction and external data transmission between various functional modules. On the one hand, it enables real-time data interaction between internal modules such as the PID control module 102 and the current limiting module 103, ensuring the synchronous transmission of control commands and status data. On the other hand, it can communicate with the charging management platform and the vehicle battery management system to upload data such as system operating status and over-limit output records, while receiving control parameters issued by the platform, such as over-limit threshold updates and protection strategy adjustments. Through data communication, remote monitoring and maintenance of the system can be achieved.

[0072] Based on this, this application provides an over-limit output control method for a charging circuit, which will be described in detail below with reference to the accompanying drawings.

[0073] Please see Figure 2 , Figure 2 This is a flowchart illustrating an over-limit output control method for a charging circuit provided in an embodiment of this application, as shown below. Figure 2 As shown, the method includes the following steps:

[0074] S210, the charging circuit is detected to be in over-limit output mode, and the temperature of each of the multiple detection points at the next moment is determined.

[0075] The over-limit output mode is used to indicate the operating status of the charging circuit within the range of rated current and maximum allowable output current.

[0076] In this context, the charging circuit refers to the complete current flow path in the charging system, from the grid side to the charging pile, and then to the power battery. All components of the charging circuit are integrated into or connected to the charging pile. The charging pile uses a main control unit to regulate the circuit's on / off state and electrical parameters, achieving intelligent control of the charging process.

[0077] Among them, the over-limit output mode is a controllable operating mode in which the charging system actively allows the operating current of the charging circuit to exceed the rated current, but strictly limits it to the rated current and the maximum allowable output current, in order to meet the temporary high-power charging needs of electric equipment, such as electric vehicles, while ensuring the electrical safety of the charging circuit and the life of the equipment.

[0078] When a high-power charging request from an electric device is received and the real-time status of the charging circuit meets the preset conditions, the over-limit output mode is activated, and the temperature of each detection point is monitored in real time. If the temperature rise reaches the warning temperature or the temperature rise is predicted to exceed the power reduction threshold in a short period of time, the over-limit output mode is immediately exited and the rated output mode is switched.

[0079] The preset conditions may include that the temperature of all components in the current charging circuit is within a safe threshold range and that cooling conditions are sufficient. Sufficient cooling conditions are used to indicate that the fan is fault-free during air cooling and that the coolant flow, hydraulic pressure, liquid level, and circulation pump are normal during liquid cooling.

[0080] Among them, the warning temperature is less than the fault threshold. For example, the warning temperature is 5°C lower than the fault threshold.

[0081] In one possible embodiment, before detecting that the charging circuit is currently in an over-limit output mode and determining the temperature of each of the multiple detection points at the next moment, the method further includes: determining a current limit for each detection point based on the real-time temperature of each detection point; detecting that the real-time current of each detection point is less than the current limit, determining whether multiple over-limit output conditions are met, the multiple over-limit output conditions including temperature constraints, cooling constraints, current demand constraints, and power constraints; if the multiple over-limit output conditions are met, then entering the over-limit output mode; if the multiple over-limit output conditions are not met, then performing a current limiting output action on each detection point based on the minimum value among the current limits of each detection point.

[0082] Multiple detection points are set in the charging circuit, and an independent PID controller is configured for each temperature detection point to independently protect the key nodes in the charging circuit and achieve comprehensive coverage.

[0083] Specifically, the temperature at each detection point is monitored in real time, and the rate of temperature change is calculated. Based on the real-time temperature and the rate of temperature change, it is determined whether to trigger the emergency protection mechanism.

[0084] For example, temperature data can be collected from multiple detection points at a period of 10ms, or a sampling frequency of 10Hz. After acquiring the temperature data, the temperature change rate is calculated first, and then a second-order Butterworth low-pass filter with a cutoff frequency of 2Hz is used to filter the temperature change rate. At the same time, the temperature resolution is set to 0.1℃, that is, the minimum identifiable increment of the temperature data is 0.1℃.

[0085] When the real-time temperature at any detection point reaches the fault threshold, a shutdown fault is triggered.

[0086] The fault thresholds for each detection point can be different or not the same. For example, the fault threshold for detection point 1 is 85℃, the fault threshold for detection point 2 is 75℃, and the fault threshold for detection point 3 is 85℃.

[0087] If the temperature change rate at any detection point exceeds the preset change rate multiple times consecutively, an emergency shutdown will be triggered.

[0088] For example, when the temperature change at the i-th detection point exceeds 3℃ / s and occurs three times consecutively, an emergency shutdown is triggered.

[0089] Specifically, if the temperature change rate at any detection point exceeds a preset change rate and the duration is within a first preset range, a pre-protection state is triggered; if the duration is within a second preset range, an emergency shutdown is triggered. The minimum value of the second preset range is greater than the maximum value of the first preset range.

[0090] For example, when the temperature change at the i-th detection point exceeds 3℃ / s and lasts for 2s, a pre-protection state is triggered, and when the duration reaches 10s, an emergency shutdown is triggered.

[0091] In one possible embodiment, it can be first determined whether to trigger the emergency protection mechanism based on the rate of temperature change. If it is determined that the emergency protection mechanism is not triggered, then it can be determined whether to trigger the emergency protection mechanism based on the real-time temperature.

[0092] As can be seen, in this embodiment, the calculation of the temperature change rate can identify the trend of abnormal temperature rise in advance. Compared with the monitoring method that only relies on the temperature threshold, it can identify potential overheating risks and avoid sudden failures. At the same time, the shutdown and power-off triggered by the duration can reduce unnecessary shutdowns caused by single data misjudgment and can quickly start protection actions in case of abnormality. Combined with the judgment of direct shutdown fault triggered by temperature exceeding the limit, it effectively improves the safety of equipment operation, reduces equipment damage caused by abnormal temperature, and thus ensures the long-term stable operation of the equipment.

[0093] In this process, if it is determined that the emergency protection mechanism will not be triggered, the PID controller of each detection point is run in parallel based on the real-time temperature of each detection point to determine the current limit of each detection point.

[0094] In one possible embodiment, different PID parameters and set temperatures can be configured for each detection point based on its characteristics. PID parameter tuning methods include the Ziegler-Nichols tuning method and the trial-and-error method. The Ziegler-Nichols tuning method is used to determine the approximate range of parameters, and the trial-and-error method is used to fine-tune the parameters under actual working conditions to confirm the final PID parameters to be used.

[0095] in, The parameters can be adjusted by combining the device datasheet and actual operating conditions.

[0096] Among them, for the first For each detection point, the PID algorithm formula (1) is as follows:

[0097] ,

[0098] in, It is the output control quantity of the PID controller corresponding to the i-th detection point. For the proportional term parameter of the i-th detection point, For the integral term parameter of the i-th detection point, Let be the differential term parameter of the i-th detection point. Let be the difference between the actual temperature and the set temperature at the i-th detection point. The specific formula (2) is as follows:

[0099] ,

[0100] in, The set temperature for the i-th detection point. Let be the actual temperature at i detection points.

[0101] Among them, based on the output control quantity of the PID controller, the maximum current of the charging circuit and the proportional coefficient, the current limit value corresponding to the output of each PID controller is determined, and the specific formula (3) is as follows:

[0102] ,

[0103] in, The scaling factor for the i-th detection point is... This is the maximum current of the charging circuit. The current limit value for the i-th detection point is the maximum permissible operating current for safe operation of that detection point.

[0104] The proportional coefficients for each detection point are different. For example, the proportional coefficient for detection point 1 is 1.2, the proportional coefficient for detection point 2 is 1.5, and the proportional coefficient for detection point 3 is 1.0.

[0105] Specifically, based on the current limit value at each detection point, it is determined whether a current limiting output action is required.

[0106] Specifically, the actual current at each detection point is compared with the current limit at that detection point. If the actual current at any detection point is greater than or equal to the current limit, a power limiting action is triggered, which indirectly reduces the operating current of the component by reducing the output power of the system.

[0107] Specifically, if the device is originally in over-limit output mode but triggers a power limiting action, it will immediately exit the over-limit output mode.

[0108] Specifically, the final current limit value is determined based on the current limit value at each detection point. In particular, the minimum value among all independently calculated current limits and the maximum current of the charging circuit is taken as the final current limit value.

[0109] For example, if there are 4 detection points, 4 current limits will be output, and the final current limit value will be... The specific formula (4) is as follows: .

[0110] Furthermore, to avoid frequent state switching in the system, a lag prevention strategy is implemented, for example, setting 0.1% × The hysteresis of A prevents the system from repeatedly switching between two states due to minor signal fluctuations, thereby ensuring the stability of equipment operation.

[0111] If the actual current at all detection points is less than the corresponding current limit, then the decision on whether to enter the over-limit output mode is made based on multiple over-limit output conditions.

[0112] Temperature constraint is used to indicate whether the temperature at each detection point is lower than the current limit point. The current limit point is a critical temperature threshold. When the temperature reaches this value, the device will trigger current limiting protection to limit the current output and avoid overheating damage.

[0113] The cooling constraint indicates that the fan is functioning correctly during air cooling, and that the coolant flow, hydraulic pressure, level, and circulation pump are normal during liquid cooling. The current demand constraint indicates that the current demand exceeds the rated current. The power constraint indicates that the actual output power at each detection point is less than the system's rated value.

[0114] Furthermore, the over-limit output condition also includes instruction constraints, namely, determining whether the system has other power limiting instructions.

[0115] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the control flow for over-limit protection provided in an embodiment of this application, such as... Figure 3 As shown, first, determine if the actual temperature at each detection point is lower than the current-limiting point; if the actual temperature at each detection point is lower than the current-limiting point, then determine if the current demand is greater than the rated current; if the current demand is greater than the rated current, then determine if the actual output power at each detection point is less than the system's rated value; if the actual output power at each detection point is less than the system's rated value, then determine if the system has any other power-limiting commands; if the system has no other power-limiting commands, then enter the over-limit output mode. In other words, if all the above constraints are met simultaneously, the system can enter the over-limit output mode.

[0116] If the current system is in over-limit output mode and a certain constraint condition is not met, such as the actual temperature of the detection point being greater than or equal to the current limiting point, the current demand being less than or equal to the rated current, or the actual output power of the detection point being greater than or equal to the system's rated value; or if the system has other power limiting commands, then the system will immediately exit the over-limit output mode.

[0117] If the current device is not in over-limit output mode, but a certain constraint condition is not met, the device will not enter over-limit output mode. Instead, it will take the minimum value of the current limit at each detection point and the maximum current of the charging circuit as the final limit current value, and perform current limiting output action based on the final limit current value.

[0118] As can be seen, in this embodiment, the state of multiple detection points can be precisely and independently controlled simultaneously, and the current constraint of each detection point can be adapted to its actual operating requirements by optimizing the control of different detection points through PID parameters. Subsequently, the minimum value of the current limit at each point is determined as the final current limit value, which can achieve strict current control and ensure the stability and safety of equipment operation.

[0119] In one possible embodiment, the actual rated current of the charging gun is a fixed value, but the maximum charging current that the charging gun can withstand is greater than the rated current. For example, if the rated current is 800A, the maximum short-term charging current can be 1200A. When the demand exceeds the rated current, extra attention should be paid to the temperature rise of the charging gun wire and the temperature rise of the entire power circuit to prevent damage and accelerated aging of components, charging gun wire, etc. due to overheating.

[0120] The operating current of the charging circuit includes multiple current segments between the rated current and the maximum allowable output current, and each current segment corresponds to a safe time threshold.

[0121] Taking an 800A gun as an example, the maximum allowable output current is 1200A. The over-limit output can be divided into four segments. Through multiple actual measurements, the maximum safe window time, i.e., the safe time threshold, for each current segment is determined. See Table 1 below for details.

[0122] Table 1 Maximum Safety Window Schedule for Current Range

[0123]

[0124] In the initial stage, the charging gun can operate for a long time within the range of 0A to 800A. When the charging gun is operating in stage 1 and the timeout occurs during the short-term peak stage, the charging current is in the range of 800A to 900A, and the maximum charging time is 12 minutes. When the charging time exceeds 12 minutes, the load will be reduced to 800A. The same applies to other stages.

[0125] In one possible embodiment, if the charging circuit is detected to be in an over-limit output mode, a temperature rise prediction model for each detection point is established. Based on the thermoelectric coupling model, the available working time for each detection point to reach the warning temperature under different currents is expressed as a calculable prediction model.

[0126] Specifically, please refer to Figure 4 , Figure 4This is a flowchart illustrating a method for determining the reference remaining time for exceeding the output limit at detection point i, as provided in an embodiment of this application. Figure 4 As shown, the input parameters include the heat capacity, heat dissipation coefficient, real-time temperature, real-time current of detection point i, and the coupling heat transfer coefficient between detection point i and other detection points p. The reference remaining time for detection point i to exceed the limit is predicted by the temperature rise prediction model j of detection point i. The output parameter is the reference remaining time for detection point i to exceed the limit.

[0127] In one possible embodiment, detecting that the charging circuit is currently in an over-limit output mode and determining the next moment temperature of each of the multiple detection points includes: acquiring the real-time temperature, heat capacity, and heat dissipation coefficient of each detection point; determining the thermal conduction coupling coefficient between each detection point; determining the temperature change of each detection point based on the thermal conduction coupling coefficient, the heat dissipation coefficient, and the heat capacity; and determining the next moment temperature based on the real-time temperature and the temperature change.

[0128] The heat capacity C of each detection point is calibrated experimentally. A known heat source is applied to the detection point individually, and the transient curve of the temperature response is recorded. The heat capacity and possible coupling parameters are obtained by least squares fitting.

[0129] Among them, heat dissipation coefficient It can also be the cooling coefficient, which is used to represent the heat dissipation capacity of temperature relative to ambient temperature. Design a step-down or heating experiment, give a constant ambient temperature and the initial temperature of the detection point, and observe the cooling curve at the given ambient temperature after turning off all heat sources. Under the premise of ignoring the coupling of other detection points, the heat dissipation coefficient is obtained by fitting with a first-order thermal model.

[0130] The thermal conductivity coupling coefficient was calibrated experimentally at the detection points. Combined heating or cooling experiments were conducted, and the temperature response was recorded. The change under a known temperature difference is fitted using the least squares method to one or more data points to characterize the coupling relationship between the detection points. Finally obtained matrix.

[0131] Among them, based on the thermal conduction coupling coefficient, heat dissipation coefficient and heat capacity, a thermal coupling equation for multiple detection points is established, which then describes the thermal conduction and heat dissipation coupling of different detection points in detail and predicts the temperature change of each detection point.

[0132] In one possible embodiment, determining the temperature change at each detection point based on the thermal conduction coupling coefficient, the heat dissipation coefficient, and the heat capacity includes: determining the heat dissipation reference power of each detection point under the synergistic effect of coupled thermal conduction and local cooling based on the real-time temperature, the thermal conduction coupling coefficient, and the heat dissipation coefficient; obtaining the ambient temperature of each detection point; determining the heat dissipation reference power of the ambient temperature based on the heat dissipation coefficient; determining the heat generation power of each detection point based on the real-time current of each detection point; obtaining the thermal deviation power based on the heat dissipation reference power, the heat dissipation reference power, and the heat generation power; and determining the temperature change based on the heat capacity, the time step, and the thermal deviation power.

[0133] Among them, based on the real-time temperature, thermal conduction coupling coefficient and heat dissipation coefficient, a linear term is constructed to describe the combined effect of temperature change caused by coupling conduction and local cooling, and then the heat dissipation reference power is solved. The specific formula (5) is as follows:

[0134] ,

[0135] in, It is the thermal conduction coupling coefficient matrix between multiple detection points. It is a local heat dissipation coefficient matrix. The real-time temperature vector of each detection point is used to determine the internal heat transfer effect driven by the current temperature distribution caused by the heat conduction coupling between multiple detection points by multiplying the heat conduction coupling coefficient matrix and the real-time temperature vector. At the same time, the heat dissipation effect of local cooling based on the current temperature is determined by multiplying the heat dissipation coefficient matrix and the real-time temperature vector. The linear term obtained by subtracting the two integrates the heat transfer of the heat conduction coupling of multiple detection points and the heat dissipation of local cooling, and correlates the heat exchange intensity of the real-time temperature under the synergistic effect of the two in a linear form.

[0136] Among them, the environment coupling vector By coupling the ambient temperature as an external input to each detection point, this parameter is calibrated experimentally, using the same method. The same applies, so I won't go into details here.

[0137] in, This is a matrix composed of the heat dissipation coefficients between each detection point and the environment, where each element corresponds to the heat dissipation coefficient of one detection point. When determining the heat dissipation reference power for the ambient temperature, it is only necessary to include the heat dissipation coefficients of each detection point in the matrix. Compared with ambient reference temperature Multiplication is performed to obtain the heat dissipation reference power of each detection point based on its own heat dissipation coefficient and the ambient temperature.

[0138] Among them, a linear relationship between real-time current and heat source power loss is constructed, and the least squares method is used to fit a and b with multiple sets of data points through temperature rise experiments. The specific formula (6) is as follows: ,in, This refers to the power loss of the heat source, i.e., the aforementioned heat generation power. This represents the real-time current at the detection point.

[0139] The heat dissipation reference power is added to the heat dissipation power, and the heat dissipation reference power is subtracted to obtain the heat deviation power. Then, the product of the time step, the heat deviation power, and the reciprocal of the heat capacity is calculated to obtain the temperature change.

[0140] Specifically, the thermal coupling equation is a quantitative expression of the thermal coupling relationship among multiple detection points based on continuous-time matrix differential equations. That is, the thermal dynamic differential equations of multiple detection points are combined in the form of matrices and vectors, and the coupling change process of the thermal state of each detection point is described by the continuous-time derivative relationship. The specific formula (7) is as follows:

[0141] ,

[0142] in, The matrix is ​​composed of the heat capacity of each detection point. Heat capacity is measured in J / ℃; It is the rate of change of temperature at each detection point over a continuous time dimension. It is a time variable, and the unit can be seconds; A matrix constructed for the thermal conduction coupling coefficient between detection points; It is a vector composed of the temperatures at each detection point, T=[T1,T2,…]^T; A coefficient matrix used to characterize the net heat conduction and cooling effect between detection points; For heat source power loss; This is the environment coupling vector; The ambient temperature is used; this parameter uses the ambient temperature sample value.

[0143] Due to the implementation requirements of practical applications, continuous functions need to be processed with a given time step. Discretization, for example, It can be 100ms. The specific formula (8) is as follows:

[0144] .

[0145] The differential equation is approximated by forward difference in time, as shown in formula (9) below:

[0146] .

[0147] Substituting the above formula (9) into formula (7) yields the explicit Euler scheme, specifically formula (10) as follows:

[0148] .

[0149] in, Used to solve for the heat dissipation reference power. For real-time temperature, The reference power for heat dissipation This refers to the heating power.

[0150] The temperature at the next moment is obtained by adding the real-time temperature and the temperature change. .

[0151] Since each detection point is located at a different location, the ambient temperature has a different impact on it. Combined with the thermal conduction coupling coefficient between detection points, the specific calculation process of the temperature at the next moment for each detection point is different.

[0152] In one possible embodiment, if four detection points are set in the charging circuit, detection point 1 is located at the charging gun head, and detection points 2, 3, and 4 are located inside the charging device. Based on the actual wiring inside the charging device and field applications, it is known that detection point 1 is only coupled to detection point 2, while detection points 2, 3, and 4 are mutually coupled. The diagonal elements should be 0, and the matrix usually needs to be symmetric and positive semi-definite to help with energy conservation and stability. The coupled heat transfer matrix is ​​represented as follows:

[0153] ,

[0154] in, .

[0155] Among them, detection point 1 is located on the outside of the charging device, so the influence of ambient temperature on the gun head needs to be considered. Detection points 2, 3, and 4 are located on the inside of the charging device, where the ambient temperature is deeply coupled with the temperature of each area. Therefore, there is no need to consider the influence of ambient temperature on each device and area. Based on formula (10), the specific calculations for each detection point are as follows:

[0156] Detection point 1:

[0157] .

[0158] Detection point 2:

[0159] .

[0160] Detection point 3:

[0161] .

[0162] Detection point 4:

[0163] .

[0164] S220, based on the real-time temperature of each detection point, the temperature at the next moment, and the temperature difference, determine the reference remaining time for each detection point to exceed the limit for output.

[0165] According to formula (10), the temperature after n discrete time periods can be obtained. It is only necessary to continuously apply the discrete equation until the temperature reaches or exceeds the warning temperature, and then calculate the required number of time steps to obtain how much time is left until the warning temperature of each detection point.

[0166] In one possible embodiment, determining the reference remaining time for each detection point to exceed the output limit based on the real-time temperature of each detection point, the temperature at the next moment, and the temperature difference includes: determining the temperature change rate based on the real-time temperature and the temperature at the next moment; and determining the reference remaining time based on the temperature change rate and the temperature difference.

[0167] The difference between the real-time temperature and the warning temperature is calculated to obtain the temperature difference value.

[0168] Specifically, the target difference between the next temperature and the real-time temperature is calculated, and the ratio of the target difference to the time step is calculated to obtain the temperature change rate. The time step is the temperature acquisition and calculation cycle, which can be 10 ms.

[0169] Among them, the rate of temperature change The specific formula (11) is as follows:

[0170] .

[0171] Specifically, the ratio of the temperature difference to the rate of temperature change is calculated to obtain the warning temperature at each detection point. How much time is left, i.e., the remaining time. The specific formula (12) is as follows:

[0172] .

[0173] Specifically, after obtaining the reference remaining time, if the reference remaining time at a certain detection point is less than a preset threshold, the over-limit output mode will be exited prematurely to prevent device overheating. For example, the preset threshold is 5 seconds.

[0174] S230, determine the cumulative running time of the over-limit output mode based on the first over-limit time of the current segment and / or the second over-limit time of at least one preceding current segment.

[0175] Wherein, the second over-limit time is the sum of at least one conversion time, and the single conversion time is obtained by converting the over-limit time of a single preceding current segment according to the safe time threshold of the current current segment.

[0176] If the output current value of the charging gun is within the first current segment, then the over-limit operation time of the current current segment is the cumulative operation time.

[0177] If the output current value of the charging gun spans multiple current segments, the actual running time of different current segments can be converted into the equivalent over-limit time of the current current segment by normalizing the safe time threshold, and then accumulated to obtain the cumulative running time.

[0178] First, determine the ratio of the actual operating time of each preceding current segment to the safe time threshold of that current segment. This ratio is the equivalent over-limit contribution coefficient for that current segment. Then, sum the equivalent over-limit contribution coefficients of all preceding segments to obtain the total equivalent contribution coefficient across segments. Finally, multiply the total equivalent contribution coefficient by the safe time threshold of the current current segment to convert the operating time of each preceding current segment into the equivalent over-limit time of the current segment. After accumulating these values, obtain the cumulative operating time of the current current segment.

[0179] For example, if the charging gun operates for 3 minutes in current segment 1 with a safety time threshold of 12 minutes, 2 minutes in current segment 2 with a safety time threshold of 10 minutes, 1 minute in current segment 3 with a safety time threshold of 8 minutes, and finally jumps to current segment 4 with a safety time threshold of 6 minutes, the maximum operating time T_max_4 in current segment 4 is calculated as follows due to heat accumulation: T_max_4 = 6 - ((3 / 12 + 2 / 10 + 1 / 8) × 6) = 2.55 minutes. That is, under the condition that the circuit temperature is safe and controllable, the charging gun can still operate for a maximum of 2.55 minutes in current segment 4.

[0180] S240, based on the reference remaining time, the cumulative running time, and the safe time threshold of the current segment, determine the remaining operating time of the charging circuit in the over-limit output mode.

[0181] In one possible embodiment, determining the remaining operating time of the charging circuit in the over-limit output mode based on the reference remaining time, the cumulative operating time, and the safe time threshold of the current current segment includes: if the cumulative operating time is detected to be greater than or equal to the safe time threshold of the current current segment, controlling the charging circuit to exit the over-limit output mode; if the cumulative operating time is detected to be less than the safe time threshold of the current current segment, determining whether the target remaining time is less than a preset threshold, wherein the target remaining time is the minimum value among the reference remaining times for over-limit output at each detection point; if the target remaining time is less than the preset threshold, controlling the charging circuit to exit the over-limit output mode; if the target remaining time is greater than or equal to the preset threshold, fusing the target remaining time and the cumulative operating time to obtain a reference safe operating time; and determining the remaining operating time based on the reference safe operating time and the safe time threshold of the current current segment.

[0182] After obtaining the cumulative running time, the cumulative running time is compared with the safe time threshold of the current segment. If the cumulative running time of the charging circuit in the over-limit output mode has reached or exceeded the safe time threshold, in order to avoid safety risks such as equipment overload and overheating caused by long-term over-limit operation, the charging circuit is directly controlled to exit the over-limit output mode. If the cumulative running time has not yet reached the safe time threshold, the minimum value of the reference remaining time among each detection point is taken to obtain the target remaining time. Then, the target remaining time is compared with the preset threshold. If the target remaining time is less than the preset threshold, it indicates that the remaining safe over-limit operation time can no longer meet the subsequent operation requirements, and the over-limit output mode is exited.

[0183] If the target remaining time is greater than or equal to the preset threshold, it indicates that there is still a basis for safe over-limit operation. At this time, the target remaining time is added to the cumulative running time to obtain a reference safe running time that can comprehensively reflect the safety constraints and operating status. Finally, the safe time threshold of the current segment and the reference safe running time are compared to determine the remaining working time that the charging circuit can still operate safely in the over-limit output mode. This not only ensures the safety of equipment operation, but also realizes the flexible and efficient use of the over-limit output mode.

[0184] In one possible embodiment, determining the remaining operating time based on the reference safe operating time and the safe time threshold of the current current segment includes: if the reference safe operating time is greater than the safe time threshold of the current current segment, then determining the remaining operating time based on the safe time threshold of the current current segment and the cumulative operating time; if the reference safe operating time is less than or equal to the safe time threshold of the current current segment, then determining the target remaining time as the remaining operating time.

[0185] If the reference safe operating time is greater than the maximum safe window time of the current current segment, the output will be based on the maximum safe window time. That is, the remaining working time is the difference between the maximum safe window time and the cumulative operating time.

[0186] If the reference safe operating time is less than or equal to the maximum safe window time of the current current segment, the output will be based on the minimum remaining operating time at each detection point, that is, the target remaining time will be determined as the remaining working time.

[0187] As can be seen, in this embodiment of the application, the dual judgment of cumulative running time and target remaining time enables dynamic determination of the exit control of the over-limit output mode.

[0188] Furthermore, the remaining operating time is determined by dynamically comparing the reference safe operating time with the current segment safe time threshold, forming a dual safety constraint mechanism. When the reference safe operating time exceeds the threshold, the segment safety threshold is combined with the cumulative operating time for calculation to avoid exceeding the safety upper limit of the current segment. When the threshold is not exceeded, the target remaining time under the most stringent constraint is directly adopted to ensure that the remaining operating time is always within the safety boundary, effectively preventing risks such as equipment overload and overheating due to over-limit operation. At the same time, it accurately matches the actual operating status, maximizes the rational use of the available time of over-limit output, achieves a dynamic balance between charging circuit safety and operating efficiency, and significantly improves the reliability and flexibility of equipment operation.

[0189] As can be seen, in this embodiment, by predicting the temperature of multiple detection points at the next moment and combining the real-time temperature with the temperature difference to determine the remaining time for the multiple detection points to exceed the limit, the multiple detection points of the charging circuit are protected from overheating damage, achieving proactive prevention and control of temperature risks; by integrating the over-limit time of the current segment with the equivalent over-limit time of the previous current segment, the total over-limit time is accurately quantified; finally, by combining the reference remaining time, the cumulative running time and the current segment safety threshold to determine the remaining working time, accurate over-limit output protection can be achieved, enabling the charging circuit to maximize power output within the safety boundary, reduce invalid waiting, and improve charging efficiency and power utilization.

[0190] In one possible embodiment, please refer to Figure 5 , Figure 5 This is a schematic diagram of a charging circuit provided in an embodiment of this application, as shown below. Figure 5 As shown, four detection points are set in the charging circuit. Detection point 1 is located at the purple circle marking on the vehicle interface section, used to detect the temperature of the positive and negative terminals of the charging gun plug. Three detection points are set in the charger section: detection point 2 is located at the yellow circle marking, used to detect the temperature of the positive and negative terminals of the DC contactor; detection point 3 is located near the DC circuit components and cables, marked by the green line, used to detect the ambient temperature of the DC circuit; and detection point 4 is located near the AC circuit components and cables, marked by the blue line, used to detect the ambient temperature of the AC circuit.

[0191] Please refer to Figure 6 , Figure 6 This is a flowchart illustrating another over-limit output control method for a charging circuit provided in this application embodiment, as shown below. Figure 6 As shown, temperature is acquired in 10ms cycles; then, the temperature change rate is calculated based on the acquired temperature; it is determined whether the temperature change rate at any detection point is greater than 3℃ / s. If the result is yes, the number of consecutive occurrences is determined, and it is determined whether the number of consecutive occurrences reaches 3. If the number of consecutive occurrences reaches 3, it is determined to be a thermal runaway fault, triggering a shutdown and stopping charging; if the number of consecutive occurrences does not reach 3, the process returns to the step of calculating the temperature change rate and continues to cycle through monitoring.

[0192] If the judgment result for whether the temperature change rate at any detection point is greater than 3℃ / s is negative, then it is determined whether the real-time temperature at any detection point has reached the fault threshold; if the judgment result is positive, then a shutdown fault is triggered to avoid the risk of equipment overheating.

[0193] The fault threshold for detection point 1 is 90℃, the fault threshold for detection point 2 is 85℃, the fault threshold for detection point 3 is 70℃, and the fault threshold for detection point 4 is 70℃.

[0194] If the judgment result is negative, the PID controller of each detection point is run in parallel. The PID control algorithm is used to precisely adjust the parameters associated with each detection point, and then the limiting current corresponding to each detection point is calculated.

[0195] Each detection point is equipped with an independent PID control unit, with different PID parameters and set temperatures set according to the component characteristics. Specifically, the PID control unit for detection point 1 includes: =2.5, =0.1, =1.0, =75℃; the PID control unit at detection point 2 includes: =3.0, =0.15, =1.2, =70℃; the PID control units for detection points 3 and 4 include: =2.0, =0.08, =0.8, =55℃.

[0196] Each output control quantity is calculated according to formula (1), and the current limit value of each detection point is determined according to the output control quantity, the maximum current of the charging circuit and the proportional coefficient.

[0197] Specifically, the proportional gain is different for each PID controller, i.e. =1.2 (charging gun plug) =1.0 (DC contactor) =1.5 (DC loop area environment) =1.8 (AC loop area environment).

[0198] After obtaining the limiting current, the process enters the power limiting judgment. First, it determines whether the power limiting is triggered based on the actual current and the limiting current. If it is not triggered, it further determines whether the current condition meets the over-limit output condition. If the condition meets the condition, it enters the over-limit output mode. If it does not meet the condition, it calculates the final limiting current value.

[0199] When the power limit is triggered, if the system was originally in over-limit output mode, it will exit the mode, calculate the final limit current value, and use this value to limit the output current. After this action is completed, the process will cycle back to the temperature acquisition step, thus enabling the charging system to periodically regulate the power and current output within a safe range.

[0200] After entering the over-limit output mode, the maximum over-limit output duration of each detection point is calculated. That is, for each detection point, the maximum over-limit output running time that the detection point can withstand is calculated based on its current state. Then, the minimum value of the maximum over-limit output duration of each detection point is obtained. The duration with the smallest safety margin among all detection points is used as a unified benchmark to ensure that all detection points are within the safety constraints.

[0201] The process involves accumulating the total over-limit output time to determine the cumulative running time in the current over-limit output mode. If the total over-limit output time is greater than or equal to the maximum safe window time of the current current segment, it indicates that the cumulative running time has exceeded the safe time threshold corresponding to the current charging current. In this case, the over-limit output mode is exited, and the process loops back to temperature acquisition. If the total over-limit output time is less than the maximum safe window time of the current current segment, the next judgment is made to determine whether the minimum output duration is less than 5 seconds.

[0202] If the judgment result is yes, it means that the remaining safe time for over-limit operation is less than 5 seconds, and the over-limit output mode needs to be exited to ensure safety; if the judgment result is no, the process will loop back to the previous temperature acquisition step, continue to maintain the over-limit output mode and continue to perform safety monitoring.

[0203] As can be seen, in this embodiment, by equipping each key component's detection point with temperature detection and an independent PID controller, independent and precise protection of all component detection points is achieved, comprehensively covering critical areas such as components and interfaces. Furthermore, in the over-limit output process, the minimum safe duration of the detection point and the accumulated running time are used to control the over-limit duration, maintaining over-limit output within a safe range to fully utilize power, reducing unnecessary power limitations, and effectively improving charging operation efficiency. Additionally, this solution uses PID parameters to independently optimize control of different component detection points, allowing for flexible configuration of PID rules for detection points when adding, removing, or replacing components. This aligns with the thermal characteristics of different component detection points in actual engineering, enhancing the system's engineering practicality and long-term adaptability.

[0204] For examples consistent with the above embodiments, please refer to... Figure 7 , Figure 7 This is a functional unit block diagram of an over-limit output control device for a charging circuit provided in an embodiment of this application, such as... Figure 7 As shown, the over-limit output control device 70 for the charging circuit includes: a first determining unit 71, used to detect that the charging circuit is currently in an over-limit output mode, and determine the temperature at the next moment of each of the multiple detection points, wherein the over-limit output mode is used to indicate the operating state of the charging circuit's operating current within the range of rated current and maximum allowable output current; a second determining unit 72, used to determine the reference remaining time for each detection point to exceed the limit output based on the real-time temperature of each detection point, the temperature at the next moment, and the temperature difference, wherein the temperature difference is the difference between the real-time temperature and the warning temperature; a third determining unit 73, used to determine the cumulative operating time of the over-limit output mode based on the first over-limit time of the current current segment and / or the second over-limit time of at least one preceding current segment, wherein the second over-limit time is the sum of at least one conversion time, and a single conversion time is obtained by converting the over-limit time of a single preceding current segment based on the safety time threshold of the current current segment; and a fourth determining unit 74, used to determine the remaining operating time of the charging circuit in the over-limit output mode based on the reference remaining time, the cumulative operating time, and the safety time threshold of the current current segment.

[0205] In one possible embodiment, when detecting that the charging circuit is currently in an over-limit output mode, and determining the temperature of each of the multiple detection points at the next moment, the first determining unit 71 is specifically configured to: acquire the real-time temperature, heat capacity, and heat dissipation coefficient of each detection point; determine the thermal conduction coupling coefficient between each detection point; determine the temperature change of each detection point based on the thermal conduction coupling coefficient, the heat dissipation coefficient, and the heat capacity; and determine the temperature at the next moment based on the real-time temperature and the temperature change.

[0206] In one possible embodiment, in determining the temperature change at each detection point based on the thermal conduction coupling coefficient, the heat dissipation coefficient, and the heat capacity, the first determining unit 71 is further configured to: determine the heat dissipation reference power of each detection point under the synergistic effect of coupled thermal conduction and local cooling based on the real-time temperature, the thermal conduction coupling coefficient, and the heat dissipation coefficient; obtain the ambient temperature of each detection point; determine the heat dissipation reference power of the ambient temperature based on the heat dissipation coefficient; determine the heat generation power of each detection point based on the real-time current of each detection point; obtain the thermal deviation power based on the heat dissipation reference power, the heat dissipation reference power, and the heat generation power; and determine the temperature change based on the heat capacity, the time step, and the thermal deviation power.

[0207] In one possible embodiment, regarding determining the remaining operating time of the charging circuit in the over-limit output mode based on the reference remaining time, the cumulative operating time, and the safe time threshold of the current segment, the fourth determining unit 74 is specifically configured to: if the cumulative operating time is detected to be greater than or equal to the safe time threshold of the current segment, control the charging circuit to exit the over-limit output mode; if the cumulative operating time is detected to be less than the safe time threshold of the current segment, determine whether the target remaining time is less than a preset threshold, wherein the target remaining time is the minimum of the reference remaining time at each detection point that can be over-limited; if the target remaining time is less than the preset threshold, control the charging circuit to exit the over-limit output mode; if the target remaining time is greater than or equal to the preset threshold, merge the target remaining time and the cumulative operating time to obtain a reference safe operating time; and determine the remaining operating time based on the reference safe operating time and the safe time threshold of the current segment.

[0208] In one possible embodiment, in determining the remaining operating time based on the reference safe operating time and the safe time threshold of the current current segment, the fourth determining unit 74 is further configured to: if the reference safe operating time is greater than the safe time threshold of the current current segment, determine the remaining operating time based on the safe time threshold of the current current segment and the cumulative operating time; if the reference safe operating time is less than or equal to the safe time threshold of the current current segment, determine the target remaining time as the remaining operating time.

[0209] In one possible embodiment, before detecting that the charging circuit is currently in an over-limit output mode and determining the temperature of each of the multiple detection points at the next moment, the over-limit output control device 70 of the charging circuit is further configured to: determine the current limit of each detection point based on the real-time temperature of each detection point; detect that the real-time current of each detection point is less than the current limit, determine whether multiple over-limit output conditions are met, the multiple over-limit output conditions including temperature constraints, cooling constraints, current demand constraints, and power constraints; if the multiple over-limit output conditions are met, then enter the over-limit output mode; if the multiple over-limit output conditions are not met, then perform a current limiting output action on each detection point based on the minimum value among the current limits of each detection point.

[0210] In one possible embodiment, in determining the reference remaining time for each detection point to exceed the output limit based on the real-time temperature of each detection point, the temperature at the next moment, and the temperature difference, the second determining unit 72 is further configured to: determine the temperature change rate based on the real-time temperature and the temperature at the next moment; and determine the reference remaining time based on the temperature change rate and the temperature difference.

[0211] It is understood that since the method embodiments and the device embodiments are different presentations of the same technical concept, the content of the method embodiment section in this application should be adapted to the device embodiment section in a synchronous manner, and will not be repeated here.

[0212] In the case of using integrated units, please refer to Figure 8 , Figure 8 This is a functional unit block diagram of another charging circuit over-limit output control device provided in the embodiments of this application, such as... Figure 8As shown, the over-limit output control device 70 for the charging circuit includes a processing module 702 and a communication module 701. The processing module 702 controls and manages the operation of the over-limit output control device 70, for example, executing the steps of the first determining unit 71, the second determining unit 72, the third determining unit 73, and the fourth determining unit 74, and / or performing other processes of the technology described herein. The communication module 701 is used for interaction between the over-limit output control device 70 and other devices.

[0213] Among them, such as Figure 8 As shown, the over-limit output control device 70 of the charging circuit may further include a storage module 703, which is used to store the program code and data of the over-limit output control device 70 of the charging circuit.

[0214] The processing module 702 can be a processor or controller, such as a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computational functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0215] The communication module 701 can be a transceiver, RF circuit, or communication interface, etc. The storage module 703 can be a memory.

[0216] All relevant content in each scenario involved in the above method embodiments can be referenced from the functional descriptions of the corresponding functional modules, and will not be repeated here. The over-limit output control device 70 of the above charging circuit can perform the above... Figure 2 The over-limit output control method of the charging circuit shown.

[0217] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of an electronic device proposed in an embodiment of this application, as shown below. Figure 9As shown, the electronic device 900 includes a processor 910, a memory 920, a communication interface 930, and one or more programs 921. The one or more programs 921 are stored in the memory and configured to be executed by the processor. When the program is executed, it includes some or all of the steps of the over-limit output control method for any charging circuit described in the above method embodiments. The processor, memory, and communication interface are interconnected and complete communication between them.

[0218] The memory can be volatile memory such as Dynamic Random Access Memory (DRAM) or non-volatile memory such as a hard disk drive. The memory stores a set of executable program code, and the processor calls the executable program code stored in the memory to execute some or all of the steps of the over-limit output control method for any charging circuit described in the above embodiments of the over-limit output control method for the charging circuit.

[0219] As can be seen, the electronic device 900 described in this application embodiment first detects that the charging circuit is currently in an over-limit output mode, determines the temperature of each detection point at the next moment among multiple detection points, the over-limit output mode is used to indicate the operating state of the charging circuit's operating current within the range of rated current and maximum allowable output current; then, based on the real-time temperature of each detection point, the next moment temperature, and the temperature difference, determines the reference remaining time for each detection point to exceed the limit output, the temperature difference being the difference between the real-time temperature and the warning temperature; then, based on the first over-limit time of the current current segment and / or the second over-limit time of at least one preceding current segment, determines the cumulative operating time of the over-limit output mode, the second over-limit time being the sum of at least one conversion time, a single conversion time being obtained by converting the over-limit time of a single preceding current segment according to the safety time threshold of the current current segment; finally, based on the reference remaining time, the cumulative operating time, and the safety time threshold of the current current segment, determines the remaining operating time of the charging circuit in the over-limit output mode.

[0220] This application predicts the temperature of multiple detection points at the next moment and combines the real-time temperature with the temperature difference to determine the remaining time that the multiple detection points can exceed the output limit, protecting the multiple detection points of the charging circuit from overheating damage and achieving proactive prevention and control of temperature risks. It integrates the over-limit time of the current segment with the equivalent over-limit time of the previous current segment to accurately quantify the total over-limit time. Finally, it combines the reference remaining time, the cumulative running time and the current segment safety threshold to determine the remaining working time, which can achieve precise over-limit output protection, enabling the charging circuit to maximize power output within the safety boundary, reduce unnecessary waiting, and improve charging efficiency and power utilization.

[0221] This application also provides a computer storage medium storing a computer program for electronic data interchange, which causes a computer to perform some or all of the steps of any of the methods described in the above method embodiments, wherein the computer includes an electronic device.

[0222] This application also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any of the methods described in the above method embodiments. The computer program product may be a software installation package, and the computer may include an electronic device.

[0223] It should be noted that, for the sake of simplicity, the aforementioned methods are described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are optional, and the actions and modules involved are not necessarily essential to this application.

[0224] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0225] In the several embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0226] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0227] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software program module.

[0228] If the integrated unit is implemented as a software program module and sold or used as an independent product, it can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned memory includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0229] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage device, which may include: a flash drive, a read-only memory, a random access memory, a magnetic disk, or an optical disk, etc.

[0230] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for controlling over-limit output of a charging circuit, characterized in that, include: The charging circuit is detected to be in over-limit output mode. The temperature of each of the multiple detection points at the next moment is determined. The over-limit output mode is used to indicate the operating status of the charging circuit's operating current within the range of rated current and maximum allowable output current. Based on the real-time temperature of each detection point, the temperature at the next moment, and the temperature difference, a reference remaining time for each detection point to exceed the limit is determined, where the temperature difference is the difference between the real-time temperature and the warning temperature. The cumulative running time of the over-limit output mode is determined based on the first over-limit time of the current current segment and / or the second over-limit time of at least one preceding current segment. The second over-limit time is the sum of at least one conversion time. A single conversion time is obtained by converting the over-limit time of a single preceding current segment according to the safety time threshold of the current current segment. The remaining operating time of the charging circuit in the over-limit output mode is determined based on the reference remaining time, the cumulative operating time, and the safe time threshold of the current segment.

2. The method according to claim 1, characterized in that, The detection that the charging circuit is currently in an over-limit output mode determines the temperature of each of the multiple detection points at the next moment, including: The real-time temperature, heat capacity, and heat dissipation coefficient of each detection point are obtained; Determine the thermal conduction coupling coefficient between each detection point; The temperature change at each detection point is determined based on the thermal conduction coupling coefficient, the heat dissipation coefficient, and the heat capacity. The temperature at the next moment is determined based on the real-time temperature and the temperature change.

3. The method according to claim 2, characterized in that, The step of determining the temperature change at each detection point based on the thermal conductivity coupling coefficient, the heat dissipation coefficient, and the heat capacity includes: Based on the real-time temperature, the thermal conduction coupling coefficient, and the heat dissipation coefficient, determine the heat dissipation reference power of each detection point under the combined effect of coupled thermal conduction and local cooling; Obtain the ambient temperature at each detection point; Based on the heat dissipation coefficient, determine the heat dissipation reference power for the ambient temperature; The heating power of each detection point is determined based on the real-time current at each detection point. The thermal deviation power is obtained based on the heat dissipation reference power, the heat dissipation reference power, and the heat generation power; The temperature change is determined based on the heat capacity, time step, and thermal deviation power.

4. The method according to claim 1, characterized in that, Determining the remaining operating time of the charging circuit in the over-limit output mode based on the reference remaining time, the cumulative operating time, and the safe time threshold of the current segment includes: If the cumulative running time is detected to be greater than or equal to the safe time threshold of the current current segment, the charging circuit is controlled to exit the over-limit output mode. If the cumulative running time is detected to be less than the safe time threshold of the current current segment, it is determined whether the target remaining time is less than the preset threshold. The target remaining time is the minimum value among the reference remaining times that can be exceeded by each detection point. If the remaining time of the target is less than the preset threshold, then the charging circuit is controlled to exit the over-limit output mode; If the target remaining time is greater than or equal to the preset threshold, the target remaining time and the cumulative running time are merged to obtain a reference safe running time; The remaining operating time is determined based on the reference safe operating time and the safe time threshold of the current current segment.

5. The method according to claim 4, characterized in that, The step of determining the remaining operating time based on the reference safe operating time and the safe time threshold of the current current segment includes: If the reference safe operating time is greater than the safe operating time threshold of the current current segment, then the remaining operating time is determined based on the safe operating time threshold of the current current segment and the cumulative operating time. If the reference safe operating time is less than or equal to the safe time threshold of the current current segment, then the target remaining time is determined as the remaining working time.

6. The method according to any one of claims 1-5, characterized in that, Before detecting that the charging circuit is currently in an over-limit output mode and determining the temperature of each of the multiple detection points at the next moment, the method further includes: The current limit for each detection point is determined based on the real-time temperature of each detection point. If the real-time current at each detection point is detected to be less than the current limit, it is determined whether multiple over-limit output conditions are met. The multiple over-limit output conditions include temperature constraints, cooling constraints, current demand constraints, and power constraints. If the above multiple over-limit output conditions are met, then the over-limit output mode is entered; If the multiple over-limit output conditions are not met, then the current limiting output action is performed on each detection point according to the minimum value among the current limits of each detection point.

7. The method according to any one of claims 1-5, characterized in that, The step of determining the reference remaining time for each detection point to exceed the output limit based on the real-time temperature of each detection point, the temperature at the next moment, and the temperature difference includes: The rate of temperature change is determined based on the real-time temperature and the temperature at the next moment. The reference remaining time is determined based on the temperature change rate and the temperature difference.

8. An over-limit output control device for a charging circuit, characterized in that, include: The first determining unit is used to detect that the charging circuit is currently in the over-limit output mode and determine the temperature of each of the multiple detection points at the next moment. The over-limit output mode is used to indicate the operating status of the charging circuit's operating current within the range of rated current and maximum allowable output current. The second determining unit is used to determine the reference remaining time for each detection point to exceed the limit output based on the real-time temperature of each detection point, the temperature at the next moment, and the temperature difference, wherein the temperature difference is the difference between the real-time temperature and the warning temperature. The third determining unit is used to determine the cumulative running time of the over-limit output mode based on the first over-limit time of the current current segment and / or the second over-limit time of at least one preceding current segment. The second over-limit time is the sum of at least one conversion time, and the single conversion time is obtained by converting the over-limit time of a single preceding current segment based on the safety time threshold of the current current segment. The fourth determining unit is used to determine the remaining operating time of the charging circuit in the over-limit output mode based on the reference remaining time, the cumulative operating time, and the safe time threshold of the current segment.

9. An electronic device, characterized in that, The device includes: The system includes a memory, a processor, and executable program code stored in the memory and executable on the processor, wherein the processor executes the executable program code to perform the steps of the over-limit output control method for the charging circuit as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores executable program code, which includes execution instructions for performing the steps of the over-limit output control method for the charging circuit as described in any one of claims 1-7.

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