Dual current loop controlled power supply system and its core capacity method

Abstract

The application relates to a dual-current-loop controlled power supply system and a core capacity method thereof. The power supply system comprises an input current negative feedback control module, an output current negative feedback control module, an output voltage negative feedback control module, a working mode control module and a driving parameter calculation processing module. The feedback signal output end of the input current negative feedback control module is connected with the first signal selection end of the working mode control module. The feedback signal output end of the output current negative feedback control module is connected with the second signal selection end of the working mode control module. The feedback signal output end of the working mode control module is connected with the first signal input end of the driving parameter calculation processing module. The feedback signal output end of the output voltage negative feedback control module is connected with the second signal input end of the driving parameter calculation processing module. The system can ensure accurate current regulation under various working conditions, and solves the problem of low core capacity precision caused by power conversion module efficiency fluctuation and unstable input current.

Description

Technical Field

[0001] This invention relates to the technical field of a power supply system with dual current loop control, and more particularly to a power supply system with dual current loop control and its capacity integration method. Background Technology

[0002] Currently, traditional methods for determining battery capacity typically employ offline discharge, a mature technology that suffers from energy waste, high heat generation, and low efficiency. To address this, existing technologies utilize power modules for discharge-based capacity assessment, but these only regulate the output voltage and current; input current adjustment is achieved by sampling and comparing current data before adjusting the output current. However, due to efficiency fluctuations in the power conversion module under different operating conditions, traditional methods struggle to achieve precise input current control. When the input current cannot be precisely controlled, the discharge current fluctuates with the efficiency of the main power conversion module and the input voltage, leading to current instability. Since battery capacity calculation is based on the product of discharge current and discharge time, significant current fluctuations will result in inaccurate capacity assessments, deviating from the actual value and reducing the accuracy of the capacity determination. Summary of the Invention

[0003] To address the issue of low battery capacity accuracy caused by power conversion module efficiency fluctuations and input current instability through precise control of the discharge current, this application provides a power supply system with dual current loop control and its capacity assessment method.

[0004] A dual current-loop controlled power supply system includes a main power conversion module, an input current negative feedback control module, an output current negative feedback control module, an output voltage negative feedback control module, a working mode control module, and a drive parameter calculation and processing module. The power input terminal of the main power conversion module is connected to a battery, and the power output terminal is connected to a load. The signal acquisition terminal of the input current negative feedback control module acquires the actual input current signal between the power input terminal of the main power conversion module and the battery through a current acquisition device. The feedback signal output terminal of the input current negative feedback control module is connected to the first signal selection terminal of the working mode control module. The signal acquisition terminal of the output current negative feedback control module acquires the actual input current signal between the power input terminal of the main power conversion module and the battery through a current acquisition device. The acquisition device obtains the actual output current signal between the power output terminal of the main power conversion module and the load. The feedback signal output terminal of the output current negative feedback control module is connected to the second signal selection terminal of the working mode control module. The feedback signal output terminal of the working mode control module is connected to the first signal input terminal of the drive parameter calculation and processing module. The common node between the power output terminal of the main power conversion module and the load is connected to the signal acquisition terminal of the output voltage negative feedback control module to obtain the actual output voltage signal. The feedback signal output terminal of the output voltage negative feedback control module is connected to the second signal input terminal of the drive parameter calculation and processing module. The signal output terminal of the drive parameter calculation and processing module is connected to the drive signal input terminal of the main power conversion module.

[0005] By adopting the above technical solution, the application acquires the actual input current signal through the input current negative feedback control module, the output current negative feedback control module acquires the actual output current signal provided by the main power conversion module to the load, and the output voltage negative feedback control module acquires the actual output voltage signal at the load end. Then, the operating mode control module selects the feedback signal that needs to be prioritized for control according to the current system operating mode (such as capacity-controlled mode or normal power supply mode) (e.g., prioritizing the input current feedback signal in capacity-controlled mode and the output current feedback signal in normal mode). This signal is processed by the drive parameter calculation and processing module to generate corresponding PWM and / or PFM signals. These signals are used to adjust the operating state of the main power conversion module, control its switching frequency and / or duty cycle, thereby accurately adjusting the input current or output current. When the system is in battery capacity-controlled mode, the system adjusts the battery discharge current through the input current negative feedback control module to ensure stable discharge current and achieve high-precision capacity determination. In normal power supply mode, the output current negative feedback control module and the output voltage negative feedback control module adjust the output current and output voltage to ensure stable power supply and current protection of the system. Through this dual-loop control mechanism, the system can ensure precise current regulation under various operating conditions, solving the problem of low capacitance accuracy caused by power conversion module efficiency fluctuations and unstable input current.

[0006] Preferably, the input current negative feedback control module includes an input current sampling circuit and an input current loop compensator. The signal acquisition terminal of the input current sampling circuit acquires the actual input current signal between the power input terminal of the main power conversion module and the battery through a current acquisition device. After comparing the actual input current signal with the input current set value to generate a corresponding first current error signal, the input current loop compensator is used to convert the first current error signal into a corresponding input current feedback signal. The feedback signal output terminal of the input current loop compensator is connected to the first signal selection terminal of the working mode control module.

[0007] By adopting the above technical solution, the input current can be monitored in real time through the combination of the input current sampling circuit and the input current loop compensator. The feedback signal output by the compensator acts on the control chain of the drive parameter calculation and processing module and the main power conversion module, and corrects the input current to ensure that the input current remains stable during the battery discharge process. This improves the accuracy of the system's battery capacity determination and avoids inaccurate capacity determination results due to input current fluctuations, thereby improving the system's control accuracy and capacity determination efficiency.

[0008] Preferably, the output current negative feedback control module includes an output current sampling circuit and an output current loop compensator. The signal acquisition terminal of the output current sampling circuit acquires the actual output current signal between the power output terminal of the main power conversion module and the battery through a current acquisition device. After comparing the actual output current signal with the output current set value to generate a corresponding second current error signal, the output current loop compensator is used to convert the second current error signal into a corresponding output current feedback signal. The feedback signal output terminal of the output current loop compensator is connected to the second signal selection terminal of the working mode control module.

[0009] By adopting the above technical solution, the combination of output current sampling circuit and output current loop compensator can achieve accurate acquisition and feedback control of output current, ensuring that the system can respond and adjust quickly when the output current fluctuates, thereby ensuring the stability of the output current of the power supply system in normal working mode, avoiding the impact of current fluctuations on the load, and thus improving the output stability and control accuracy of the system.

[0010] Preferably, the output voltage negative feedback control module includes an output voltage sampling circuit and an output voltage loop compensator. The signal acquisition terminal of the output voltage sampling circuit is connected to the power output terminal of the main power conversion module. After comparing the actual output voltage signal with the output voltage set value to generate a corresponding voltage error signal, the output voltage loop compensator is used to convert the voltage error signal into a corresponding output voltage feedback signal. The voltage error signal output terminal of the output voltage loop compensator is connected to the second signal input terminal of the drive parameter calculation and processing module.

[0011] By adopting the above technical solution, the combination of the output voltage sampling circuit and the output voltage loop compensator can ensure that the system can accurately acquire and regulate the output voltage. Especially under different load conditions, it can achieve precise voltage regulation, ensure the stability of the output voltage, thereby improving the voltage control accuracy of the system under various operating conditions and ensuring the safe and stable operation of the system.

[0012] Preferably, the drive parameter calculation and processing module includes a minimum value calculation unit and a drive parameter calculation unit. The first signal input terminal of the minimum value calculation unit is connected to the feedback signal output terminal of the working mode control module, and the second signal input terminal of the minimum value calculation unit is connected to the feedback signal output terminal of the output voltage negative feedback control module. The minimum value calculation unit is used to calculate the corresponding minimum value signal based on the feedback signals output by the working mode control module and the output voltage negative feedback control module. The minimum value signal output terminal of the minimum value calculation unit is connected to the minimum value signal input terminal of the drive parameter calculation unit. The drive parameter calculation unit is used to determine the corresponding power drive signal based on the minimum value signal, and the power drive signal output terminal of the drive parameter calculation unit is connected to the drive signal input terminal of the main power conversion module.

[0013] By adopting the above technical solution, the minimum value signal in the feedback signals of the working mode control module and the output voltage negative feedback control module can be calculated in real time through the combination of the minimum value calculation unit and the drive parameter calculation unit. Appropriate drive signals are generated based on the minimum value signal, thereby ensuring that the system selects the appropriate negative feedback control loop in different working modes, ensuring the stability of output voltage and current, and improving the system's response speed and control accuracy.

[0014] A capacity grading method for a power supply system based on dual current loop control is provided, applicable to a power supply system with dual current loop control. The control method includes the following steps:

[0015] Control the battery to discharge;

[0016] Acquire the input current feedback signal, output current feedback signal, and output voltage feedback signal;

[0017] Obtain the operating mode information of the power system, determine the output state of the operating mode control module based on the operating mode information, and send an input current feedback signal or an output current feedback signal to the drive parameter calculation and processing module based on the output state.

[0018] The drive parameter calculation and processing module is controlled to process the output voltage feedback signal and the input current feedback signal, or to process the output voltage feedback signal and the output current feedback signal, in order to generate a corresponding power drive signal;

[0019] Based on the power drive signal, the main power conversion module is controlled to switch to the corresponding working state to ensure that the current in the capacitance process remains constant.

[0020] Based on the predetermined preset capacity determination rules, the capacity determination operation of the battery is performed during the capacity determination process with constant current.

[0021] By adopting the above technical solution, the battery discharge can be controlled, and by acquiring the input current feedback signal, output current feedback signal, and output voltage feedback signal, the entire capacity assessment process can be precisely controlled. This ensures the stability of the current during battery discharge, thereby improving the accuracy of battery capacity assessment, avoiding inaccurate capacity assessment results due to current fluctuations, and improving the overall efficiency and reliability of the power system.

[0022] Preferably, the step of acquiring the input current feedback signal, the output current feedback signal, and the output voltage feedback signal includes:

[0023] Obtain the actual measured value of the input current Iia and the set value of the input current Iiset. Based on the actual measured value of the input current Iia and the set value of the input current Iiset, calculate the input current error signal ΔIiout. The calculation formula is: ΔIiout=Iiset-Iia;

[0024] Based on the loop negative feedback compensation algorithm, the input current error signal ΔIiout is transformed into the input current feedback signal Iic.

[0025] Obtain the actual measured value of the output current Ioa and the set value of the output current Ioset. Based on the actual measured value of the output current Ioa and the set value of the output current Ioset, calculate the output current error signal ΔIoout. The calculation formula is: ΔIoout=Ioset-Ioa;

[0026] Based on the loop negative feedback compensation algorithm, the output current error signal ΔIoout is transformed into the output current feedback signal Ioc;

[0027] Obtain the actual measured value of the output voltage Voa and the set value of the output voltage Voset. Based on the actual measured value of the output voltage Voa and the set value of the output voltage Voset, calculate the output voltage error signal ΔVoout. The calculation formula is: ΔVoout=Voset-Voa;

[0028] Based on the loop negative feedback compensation algorithm, the output voltage error signal ΔVoout is transformed into the output voltage feedback signal Voc.

[0029] By adopting the above technical solution, the input current error signal ΔIiout, the output current error signal ΔIoout, and the output voltage error signal ΔVoout can be transformed into the input current feedback signal Iic, the output current feedback signal Ioc, and the output voltage feedback signal Voc through the compensation algorithm. This enables precise processing of each feedback signal, thereby ensuring the system's accurate control of the input current, output current, and output voltage, improving the feedback control accuracy and response speed of the entire system, and ensuring the system's stability under different operating conditions.

[0030] Preferably, the step of controlling the drive parameter calculation and processing module to process the output voltage feedback signal and the input current feedback signal, or to process the output voltage feedback signal and the output current feedback signal to generate a corresponding power drive signal, includes:

[0031] If the drive parameter calculation and processing module processes the output voltage feedback signal and the input current feedback signal, then the signal with the smallest amplitude among the output voltage feedback signal and the input current feedback signal is selected as the minimum value signal; if the drive parameter calculation and processing module processes the output voltage feedback signal and the output current feedback signal, then the signal with the smallest amplitude among the output voltage feedback signal and the output current feedback signal is selected as the minimum value signal; based on the minimum value signal, the corresponding drive signal is determined.

[0032] By adopting the above technical solution, the output voltage feedback signal and input current feedback signal, or the output voltage feedback signal and output current feedback signal, can be processed by the drive parameter calculation and processing module. The signal with the smallest amplitude is selected as the minimum value signal, and the corresponding drive signal is generated based on the minimum value signal. This ensures that the system performs precise power control based on the actual feedback signal in different working modes, guarantees the stable operation of the system, and improves the system's response speed and output efficiency.

[0033] Preferably, in the step of determining the corresponding drive signal based on the minimum value signal, the drive signal includes at least a PWM signal and / or a PFM signal.

[0034] By adopting the above technical solution, the corresponding drive signal can be determined based on the minimum signal, and a PWM signal or PFM signal can be generated to adjust the working state of the main power conversion module, thereby achieving precise adjustment of the system power output. This improves the power conversion efficiency and control accuracy of the system under different load conditions, and ensures the efficient operation of the system under full capacity or normal working conditions.

[0035] Preferably, the step of performing the battery capacity verification operation during the constant current verification process based on the determined preset capacity verification rules includes:

[0036] Based on the established preset capacity rules, the approved interval t is determined. k ;

[0037] Real-time acquisition of the approved interval duration t k The discharge current value Ii of the internal storage battery k ;

[0038] According to the approved interval duration t k and the discharge current value Ii k The rated battery capacity C is calculated using the formula C = ∑Ii k ×t k .

[0039] By adopting the above technical solution, the battery capacity can be accurately calculated based on the preset capacity calculation rules and combined with the real-time obtained discharge current and time interval, ensuring that the current is constant during the battery capacity calculation process, thereby improving the accuracy of capacity calculation, avoiding the problem of battery capacity being too large or too small due to capacity calculation errors, and improving the service life of the battery and the overall reliability of the power system.

[0040] In summary, this application includes at least one of the following beneficial technical effects:

[0041] This application uses an input current negative feedback control module to acquire the actual input current signal, an output current negative feedback control module to acquire the actual output current signal provided by the main power conversion module to the load, and an output voltage negative feedback control module to acquire the actual output voltage signal at the load end. Then, the operating mode control module selects the feedback signal to be prioritized based on the current system operating mode (e.g., capacity-accumulation mode or normal power supply mode) (e.g., prioritizing the input current feedback signal in capacity-accumulation mode and the output current feedback signal in normal mode). This signal is processed by the drive parameter calculation and processing module to generate corresponding PWM and / or PFM signals. These signals are used to adjust the operating state of the main power conversion module, controlling its switching frequency or duty cycle, thereby precisely adjusting the input or output current. When the system is in battery capacity-accumulation mode, the system adjusts the battery discharge current through the input current negative feedback control module to ensure stable discharge current and achieve high-precision capacity determination. In normal power supply mode, the output current negative feedback control module and the output voltage negative feedback control module adjust the output current and output voltage to ensure stable power supply and current protection of the system. Through this dual-loop control mechanism, the system can ensure precise current regulation under various operating conditions, solving the problem of low capacitance accuracy caused by fluctuations in the efficiency of the main power conversion module and instability in the input current. Attached Figure Description

[0042] Figure 1This is a flowchart of a power supply system with dual current loop control according to an embodiment of this application.

[0043] Figure 2 This is a flowchart illustrating the specific implementation of a dual current loop controlled power supply system in one embodiment of this application.

[0044] Figure 3 This is a flowchart illustrating the specific implementation of the power supply system for technology 2 in the prior art of this application.

[0045] Figure 4 This is a flowchart of a power supply system with dual current loop control according to one embodiment of this application.

[0046] Figure 5 This is a flowchart illustrating the implementation of step S20 in a dual current loop controlled power supply system according to an embodiment of this application.

[0047] Figure 6 This is a flowchart illustrating the implementation of step S40 in a dual current loop controlled power supply system according to an embodiment of this application.

[0048] Figure 7 This is a flowchart illustrating the implementation of step S60 in a dual current loop controlled power supply system according to an embodiment of this application.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Main power conversion module; 2. Input current negative feedback control module; 21. Input current sampling circuit; 22. Input current loop compensator; 3. Output current negative feedback control module; 31. Output current sampling circuit; 32. Output current loop compensator; 4. Output voltage negative feedback control module; 41. Output voltage sampling circuit; 42. Output voltage loop compensator; 5. Drive parameter calculation and processing module; 51. Minimum value calculation unit; 52. Drive parameter calculation unit; 6. Operating mode control module. Detailed Implementation

[0051] The present application will be further described in detail below with reference to the accompanying drawings.

[0052] In one embodiment, such as Figure 1 As shown, this application discloses a power supply system with dual current loop control, which specifically includes the following steps:

[0053] A dual current loop controlled power supply system includes a main power conversion module 1, an input current negative feedback control module 2, an output current negative feedback control module 3, an output voltage negative feedback control module 4, a working mode control module 6, and a drive parameter calculation and processing module 5. The power input terminal of the main power conversion module 1 is connected to a battery, and the power output terminal of the main power conversion module 1 is connected to a load. The signal acquisition terminal of the input current negative feedback control module 2 acquires the actual input current signal between the power input terminal of the main power conversion module 1 and the battery through a current acquisition device. The feedback signal output terminal of the input current negative feedback control module 2 is connected to the first signal selection terminal of the working mode control module 6. The signal acquisition terminal of the output current negative feedback control module 3 is connected to a drive parameter calculation and processing module 5. The current acquisition device acquires the actual output current signal between the power output terminal of the main power conversion module 1 and the load. The feedback signal output terminal of the output current negative feedback control module 3 is connected to the second signal selection terminal of the working mode control module 6. The feedback signal output terminal of the working mode control module 6 is connected to the first signal input terminal of the drive parameter calculation and processing module 5. The common node between the power output terminal of the main power conversion module 1 and the load is connected to the signal acquisition terminal of the output voltage negative feedback control module 4 to acquire the actual output voltage signal. The feedback signal output terminal of the output voltage negative feedback control module 4 is connected to the second signal input terminal of the drive parameter calculation and processing module 5. The signal output terminal of the drive parameter calculation and processing module 5 is connected to the drive signal input terminal of the main power conversion module 1.

[0054] In this embodiment, the actual input current signal is acquired by the input current negative feedback control module 2, the actual output current signal is acquired by the output current negative feedback control module 3, and the actual output voltage signal is acquired by the output voltage negative feedback control module 4. Then, the operating mode control module 6 selects the feedback signal to be prioritized based on the current system operating mode (e.g., capacity-controlled mode or normal power supply mode) (e.g., input current feedback signal is prioritized during capacity-controlled mode, and output current feedback signal is selected during normal mode). This signal is processed by the drive parameter calculation and processing module 5 to generate corresponding PWM and / or PFM signals. These signals are used to adjust the operating state of the main power conversion module 1, controlling its switching frequency or duty cycle, thereby precisely adjusting the input current or output current. When the system is in battery capacity-controlled mode, the system adjusts the battery discharge current through the input current negative feedback control module 2 to ensure stable discharge current and achieve high-precision capacity determination. In normal power supply mode, the output current negative feedback control module 3 and the output voltage negative feedback control module 4 adjust the output current and output voltage to ensure stable power supply and current protection of the system. Through this dual-loop control mechanism, the system can ensure precise current regulation under various operating conditions, solving the problem of low capacitance accuracy caused by power conversion module efficiency fluctuations and unstable input current.

[0055] Specifically, such as Figure 2 As shown, the input current negative feedback control module 2 includes an input current sampling circuit 21 and an input current loop compensator 22. The signal acquisition terminal of the input current sampling circuit 21 obtains the actual input current signal between the power input terminal of the main power conversion module 1 and the battery through a current acquisition device. After comparing the actual input current signal with the input current set value to generate a corresponding first current error signal, the input current loop compensator 22 is used to convert the first current error signal into a corresponding input current feedback signal. The feedback signal output terminal of the input current loop compensator 22 is connected to the first signal selection terminal of the working mode control module 6.

[0056] In this embodiment, the connection logic between the ports of the input current negative feedback control module 2 in the dual current loop control system embodies the workflow of precise monitoring and error compensation of the input current. The signal acquisition terminal of the input current sampling circuit 21 is connected to the power input terminal of the main power conversion module 1, and is used to acquire the actual input current signal from the battery to the main power conversion module 1 in real time. This acquired signal represents the actual value of the current input current of the current system. Then, the sampling circuit sends the feedback signal of the actual current value to the current error signal input terminal of the input current loop compensator 22. After receiving the signal, the input current loop compensator 22 calculates the error signal of the input current, that is, the difference between the actual value and the set value of the input current, and processes the error signal. It then performs compensation adjustment through a control algorithm (such as PID control) to generate a corresponding compensation signal. Subsequently, the feedback signal output terminal of the input current loop compensator 22 transmits the compensated signal to the first signal selection terminal of the working mode control module 6 for further determination of the selection of the negative feedback loop. The core of the entire control logic is to ensure that the system can select the optimal feedback signal under different operating conditions by real-time acquisition and compensation of input current errors, thereby achieving stable control of the input current. Especially during the capacity determination process, this precise input current control can effectively improve the accuracy of battery capacity determination and ensure the efficient operation and stable output of the system.

[0057] In summary, by combining the input current sampling circuit 21 and the input current loop compensator 22, real-time monitoring and error correction of the input current can be achieved, ensuring that the input current remains stable during battery discharge. This improves the accuracy of the system's battery capacity determination, avoids inaccurate capacity determination results due to input current fluctuations, and thus improves the system's control accuracy and capacity determination efficiency.

[0058] Specifically, such as Figure 2 As shown, the output current negative feedback control module 3 includes an output current sampling circuit 31 and an output current loop compensator 32. The signal acquisition terminal of the output current sampling circuit 31 obtains the actual output current signal between the power output terminal of the main power conversion module 1 and the battery through a current acquisition device. After comparing the actual output current signal with the output current set value to generate a corresponding second current error signal, the output current loop compensator 32 is used to convert the second current error signal into a corresponding output current feedback signal. The feedback signal output terminal of the output current loop compensator 32 is connected to the second signal selection terminal of the working mode control module 6.

[0059] In this embodiment, the output current negative feedback control module 3 achieves real-time monitoring and precise control of the output current through the connection of its various ports. Specifically, the current acquisition uses current acquisition devices such as shunts, Hall sensors, or current transformers to convert the main power current into a voltage or small current signal. The converted signal enters the acquisition circuit, reflecting the actual current supplied by the system to the load. The sampling circuit converts this signal into a feedback signal and sends it to the current error signal input terminal of the output current loop compensator 32. After receiving the feedback signal, the output current loop compensator 32 calculates the error signal of the output current, that is, the difference between the actual value and the set value of the output current. By processing the error signal, the compensator generates an adjustment signal to correct the current error and ensure that the output current remains stable under different load conditions. Subsequently, the output current loop compensator 32 transmits the compensated error signal through its output terminal to the second signal selection terminal of the working mode control module 6, so that the working mode control module 6 can judge and select a suitable negative feedback loop. Under different operating conditions, the operating mode control module 6 determines the most suitable negative feedback loop for the current operation based on the feedback signals of the input and output currents, thereby ensuring the stability and output accuracy of the system. The entire control logic relies on the real-time acquired output current signal and ensures the stability and accuracy of the output current through the adjustment of the compensator. Especially in the normal operating mode of the system, this control can prevent the output current from being too large or unstable, thereby protecting the load and improving the operating efficiency and reliability of the system.

[0060] In summary, by combining the output current sampling circuit 31 and the output current loop compensator 32, accurate acquisition and feedback control of the output current can be achieved, ensuring that the system can respond quickly and adjust when the output current fluctuates. This ensures the stability of the output current of the power supply system under normal operating conditions, avoids the impact of current fluctuations on the load, and improves the output stability and control accuracy of the system.

[0061] Specifically, such as Figure 2 As shown, the output voltage negative feedback control module 4 includes an output voltage sampling circuit 41 and an output voltage loop compensator 42. The signal acquisition terminal of the output voltage sampling circuit 41 is connected to the power output terminal of the main power conversion module 1. After comparing the actual output voltage signal with the output voltage set value to generate a corresponding voltage error signal, the output voltage loop compensator 42 is used to convert the voltage error signal into a corresponding output voltage feedback signal. The voltage error signal output terminal of the output voltage loop compensator 42 is connected to the second signal input terminal of the drive parameter calculation and processing module 5.

[0062] In this embodiment, the connection relationships of the ports of the output voltage negative feedback control module 4 ensure precise control and real-time feedback of the output voltage. Specifically, the signal acquisition terminal of the output voltage sampling circuit 41 is connected to the power output terminal of the main power conversion module 1, and the actual voltage value output to the load by the system is acquired in real time. The sampling circuit converts the acquired output voltage signal into a feedback signal and transmits it to the voltage error signal input terminal of the output voltage loop compensator 42 through its feedback signal output terminal. After receiving the feedback signal, the output voltage loop compensator 42 calculates the error signal of the output voltage, that is, the difference between the actual output voltage and the preset voltage. Through the control algorithm inside the compensator, the compensator processes the error and generates a corresponding compensation signal. This compensation signal is sent from the voltage error signal output terminal of the output voltage loop compensator 42 to the second signal input terminal of the drive parameter calculation and processing module 5. The drive parameter calculation and processing module 5 generates a drive signal based on the signal to adjust the working state of the main power conversion module 1. The entire control logic ensures that the system can maintain the stability and accuracy of the output voltage under different load conditions by real-time acquisition and compensation of output voltage errors. In particular, when power demand fluctuates or load changes, it can quickly adjust the voltage output to ensure the stable operation of the load and prevent system instability or damage caused by voltage fluctuations.

[0063] In summary, the combination of the output voltage sampling circuit 41 and the output voltage loop compensator 42 ensures that the system can accurately acquire and regulate the output voltage. Especially under different load conditions, it can achieve precise voltage regulation, ensure the stability of the output voltage, thereby improving the voltage control accuracy of the system under various operating conditions and ensuring the safe and stable operation of the system.

[0064] Specifically, such as Figure 2 As shown, the drive parameter calculation and processing module 5 includes a minimum value calculation unit 51 and a drive parameter calculation unit 52. The first signal input terminal of the minimum value calculation unit 51 is connected to the feedback signal output terminal of the working mode control module 6, and the second signal input terminal of the minimum value calculation unit 51 is connected to the feedback signal output terminal of the output voltage negative feedback control module 4. The minimum value calculation unit 51 is used to calculate the corresponding minimum value signal based on the feedback signals output by the working mode control module 6 and the output voltage negative feedback control module 4. The minimum value signal output terminal of the minimum value calculation unit 51 is connected to the minimum value signal input terminal of the drive parameter calculation unit 52. The drive parameter calculation unit 52 is used to determine the corresponding power drive signal based on the minimum value signal. The power drive signal output terminal of the drive parameter calculation unit 52 is connected to the drive signal input terminal of the main power conversion module 1.

[0065] In this embodiment, the drive parameter calculation and processing module 5 achieves precise control of the system through the cooperation of the minimum value calculation unit 51 and the drive parameter calculation unit 52. The first signal input terminal of the minimum value calculation unit 51 is connected to the feedback signal output terminal of the operating mode control module 6 to receive feedback signals from the operating mode control module 6, and the second signal input terminal is connected to the feedback signal output terminal of the output voltage negative feedback control module 4 to obtain the output voltage feedback signal. The task of the minimum value calculation unit 51 is to compare the signals from the operating mode control module 6 and the output voltage negative feedback control module 4, and calculate the signal with the smallest amplitude as the minimum value signal. This minimum value signal represents the voltage or current parameter that needs to be adjusted first in the current system. Then, the minimum value calculation unit 51 transmits this minimum value signal to the drive parameter calculation unit 52 through its output terminal. The drive parameter calculation unit 52 calculates the corresponding power drive signal based on the received minimum value signal, which is used to adjust the operating state of the main power conversion module 1. Finally, the drive parameter calculation unit 52 sends the generated power drive signal to the drive signal input of the main power conversion module 1 through its output terminal, controlling the output characteristics of the main power conversion module 1. The entire control logic, through the selection of feedback signals by the minimum value calculation unit 51, ensures that the system prioritizes adjusting the most critical parameters under different operating conditions, and generates precise drive signals through the drive parameter calculation unit 52, ensuring the efficient operation and output stability of the main power conversion module 1. This mechanism optimizes the system's regulation capability under complex operating conditions, guaranteeing stable output of the power supply system.

[0066] In summary, by combining the minimum value calculation unit 51 and the drive parameter calculation unit 52, the minimum value signal in the feedback signals of the working mode control module 6 and the output voltage negative feedback control module 4 can be calculated in real time, and an appropriate drive signal can be generated based on the minimum value signal. This ensures that the system selects the appropriate negative feedback control loop in different working modes, ensures the stability of the output voltage and current, and improves the system's response speed and control accuracy.

[0067] like Figure 4 As shown, a capacity grading method for a power supply system based on dual current loop control is applied to a power supply system with dual current loop control. The control method includes the following steps:

[0068] S10, Control the battery to discharge;

[0069] In this embodiment, controlling the battery to discharge means guiding the battery's energy output through the main power conversion module 1 to supply power to the system load or capacity testing equipment. The purpose of discharging is to verify the battery's actual capacity. By controlling the battery's discharge rate and duration, a constant current is ensured, thus providing a basis for subsequent capacity verification. The discharge process needs to cooperate with the power conversion module to ensure a stable current output, thereby maintaining a constant current throughout the discharge process to accurately measure the battery's remaining capacity.

[0070] S20. Acquire the input current feedback signal, output current feedback signal, and output voltage feedback signal;

[0071] In this embodiment, acquiring the input current feedback signal, output current feedback signal, and output voltage feedback signal refers to collecting the real-time values ​​of the actual input current, output current, and output voltage through the input current sampling circuit 21, output current sampling circuit 31, and output voltage sampling circuit 41, respectively. The input current feedback signal represents the actual current value when the battery discharges, the output current feedback signal represents the magnitude of the current supplied by the power system to the load, and the output voltage feedback signal reflects the actual output voltage of the system. These signals are transmitted in real time to the operating mode control module 6 through the feedback control module, providing a basis for subsequent mode selection and feedback adjustment.

[0072] S30. Obtain the operating mode information of the power system, determine the output state of the operating mode control module 6 based on the operating mode information, and send an input current feedback signal or an output current feedback signal to the drive parameter calculation and processing module 5 based on the output state.

[0073] In this embodiment, the operating mode information of the power system is obtained by detecting the current operating state of the system (such as battery capacity assessment discharge mode or normal operating mode) and determining the required control strategy according to the needs of different modes. Based on the operating mode information, the operating mode control module 6 outputs corresponding signal states and selects the feedback signal that needs to be prioritized for control in the current operating mode. In battery discharge mode, the input current feedback signal is usually prioritized to maintain a constant discharge current, while in normal operating mode, the output current feedback signal may be selected to ensure the stability of the system output. Here, the operating mode information of the power system determines the current operating state of the system and thus affects the selection of the negative feedback control loop. When the power system is in battery capacity assessment mode, the goal of the system is to accurately control the battery discharge current for high-precision capacity assessment. In this mode, maintaining a constant input current is crucial because fluctuations in the input current directly affect the accuracy of the capacity assessment result. Therefore, the operating mode control module 6 prioritizes the input current feedback signal, ensuring the stability of the discharge current through real-time monitoring and adjustment of the input current, thereby guaranteeing the accuracy of the capacity assessment. When the system is in normal power supply mode, its main task is to provide a stable output current to the load to meet its power requirements and ensure normal power supply. In this situation, the stability of the output current is crucial to the reliability of the system. Therefore, the operating mode control module 6 selects the output current feedback signal. At this time, the output current control only performs current limiting protection; the module actually operates in the output voltage negative feedback control loop, i.e., constant voltage output, to prevent current fluctuations from affecting the load. This selection is based on the priority control requirements of different modes, ensuring that the system can be optimally adjusted and controlled under different operating conditions.

[0074] S40. Control the drive parameter calculation and processing module 5 to process the output voltage feedback signal and the input current feedback signal, or process the output voltage feedback signal and the output current feedback signal to generate a corresponding power drive signal;

[0075] In this embodiment, the purpose of the control drive parameter calculation and processing module 5 in processing the output voltage feedback signal and the input current feedback signal, or processing the output voltage feedback signal and the output current feedback signal, is to ensure that the system prioritizes processing the most important feedback signal under different operating conditions. After receiving these feedback signals, the drive parameter calculation and processing module 5 selects the signal with the smallest amplitude among the feedback signals through the minimum value calculation unit 51, thereby ensuring that the system prioritizes adjusting the key current or voltage parameters and ensures the stability of the output. For example, in battery discharge mode, the drive parameter calculation and processing module 5 will prioritize processing the input current feedback signal to ensure that the current remains constant.

[0076] S50. Based on the power drive signal, control the main power conversion module 1 to switch to the corresponding working state to ensure that the current of the capacitance process is constant;

[0077] In this embodiment, controlling the main power conversion module 1 to switch to the corresponding operating state based on the power drive signal refers to adjusting the operating mode of the main power conversion module 1 according to the drive signal generated by the drive parameter calculation and processing module 5. This control signal may be a PWM signal adjusting the duty cycle and / or a PFM signal adjusting the frequency, ultimately achieving precise control of the power output. The main power conversion module 1 adjusts the input current according to the received drive signal to ensure that the current remains constant during battery discharge, thereby improving the accuracy and efficiency of the capacity verification process.

[0078] S60. Based on the predetermined preset capacity verification rules, perform the capacity verification operation of the battery during the capacity verification process with constant current.

[0079] In this embodiment, based on predetermined preset capacity verification rules, the battery capacity verification operation is performed during the constant current capacity verification process. This means that, while ensuring a constant current, the actual capacity of the battery is accurately determined by integrating the accumulated current and time. For example, the system can sample and accumulate the current at certain time intervals to finally calculate the battery's discharge capacity. In this way, the actual remaining capacity of the battery can be accurately determined, thereby providing data support for system maintenance and battery replacement, and improving the reliability and safety of the power system.

[0080] In summary, by controlling the battery discharge and acquiring input current feedback signals, output current feedback signals, and output voltage feedback signals, precise control of the entire capacity assessment process can be achieved. This ensures the stability of the current during battery discharge, thereby improving the accuracy of battery capacity assessment, avoiding inaccurate assessment results due to current fluctuations, and improving the overall efficiency and reliability of the power system.

[0081] A further explanation of existing technology is that in the field of backup power, batteries, as a core component of uninterruptible power supply (UPS) systems, serve as the last line of defense, providing power to loads in the event of AC power outages or other abnormalities. Batteries are lifespan devices; their capacity decays depending on operating conditions and time. When the capacity decays to a certain extent, it will be unable to provide power to the load for a certain period, causing losses to UPS users. Especially in critical sectors, such as power operating power supplies, when a power outage occurs and the remaining battery capacity is insufficient to meet the power demands of downstream equipment, it often leads to escalation of the accident, resulting in serious consequences and losses. Therefore, in critical sectors, there is often a need to periodically verify the actual capacity of batteries to ensure that they have sufficient backup power to meet the needs of downstream loads.

[0082] Currently, battery capacity verification generally employs two methods: Method 1: The battery is discharged offline (disconnected from the power system bus) using a discharge tester, and the actual capacity is calculated and verified. Advantages: Simple and mature technology; Disadvantages: Wasteful of electrical energy, not environmentally friendly; the discharge tester typically uses resistive discharge, generating significant heat and posing a fire risk. Method 2: With technological advancements and environmental requirements, a gradual transition is underway to using power modules (including DC-to-DC converters and DC-to-AC inverters) to discharge and verify battery capacity. The discharged energy is then converted into DC or AC power for the on-site load, or converted back to AC power for grid feedback. Capacity verification during discharge is generally achieved by controlling the output voltage and / or current of the power module.

[0083] You can refer to this. Figure 3 Since the control is of the output voltage Vou and / or current Iout, rather than the input current Iin, and because the efficiency η of the main power converter varies under different operating conditions, and the input voltage Vin varies, it is impossible to achieve precise control of the input current.

[0084] However, precise control is not possible, so this application is needed to constantly adjust the input current to improve the accuracy of the capacitance. This application includes one output current negative feedback loop, one input current negative feedback loop, and a working mode controller. The working mode controller determines whether the output current negative feedback loop or the input current negative feedback loop is active based on user settings or program settings. When the input current negative feedback loop is active, the output voltage negative feedback loop should operate in an open-loop state. The open-loop state is generally achieved by setting a value higher than the output voltage bus, which is naturally saturated (i.e., reaching the upper limit of the compensator output) by the integral element in the loop compensator of the output voltage negative feedback loop. The main power conversion can be DC / DC or DC / AC, and the main power conversion topology can be various main power topologies. The current sampling circuit (input and / or output) can be a non-isolated circuit or an electrically isolated circuit. The loop compensator must contain at least an integral element. The loop compensator can be one or a combination of several automatic control negative feedback loop compensators, such as the common PID compensator. Compared to technology 1, this application provides the energy of the capacity discharge to the regular load consumption of the power system, without any additional energy waste, thus saving energy and protecting the environment. Furthermore, this solution uses a high-frequency switching power module, which is small in size. Compared to technology 2, this application has higher capacity accuracy, which can avoid insufficient actual backup power time caused by an overestimation of the capacity, thereby preventing potential accidents caused by insufficient backup power time. It can also avoid premature battery failure or retirement caused by an underestimation of the capacity, thus reducing waste or loss.

[0085] Specifically, such as Figure 5 As shown, the steps of acquiring the input current feedback signal, the output current feedback signal, and the output voltage feedback signal include:

[0086] S201. Obtain the actual measured value of input current Iia and the set value of input current Iiset. Calculate the input current error signal ΔIiout based on the actual measured value of input current Iia and the set value of input current Iiset. The calculation formula is: ΔIiout=Iiset-Iia;

[0087] S202. Based on the loop negative feedback compensation algorithm, the input current error signal ΔIiout is converted into the input current feedback signal Iic.

[0088] In this embodiment, the actual measured value of the input current Iia and the setpoint value of the input current Iiset are obtained through the input current sampling circuit 21. The actual measured value of the input current Iia represents the actual input current during the current battery discharge, while the setpoint value of the input current Iiset is the ideal value set by the system to achieve constant discharge. By calculating the difference between the two, the input current error signal ΔIiout can be obtained, which represents the difference between the current actual current and the ideal setpoint value. This error signal is an important basis for the entire feedback control system and can guide subsequent adjustment actions. Based on the loop negative feedback compensation algorithm, the input current error signal ΔIiout is converted into the input current feedback signal Iic, which serves as the control signal for adjusting the main power conversion module 1, ensuring that the input current remains stable throughout the discharge process. This compensation process can be implemented through a PID control algorithm, enabling the system to quickly respond to current fluctuations and make corresponding adjustments.

[0089] S203. Obtain the actual measured value of the output current Ioa and the set value of the output current Ioset. Based on the actual measured value of the output current Ioa and the set value of the output current Ioset, calculate the output current error signal ΔIoout. The calculation formula is: ΔIoout=Ioset-Ioa;

[0090] S204. Based on the loop negative feedback compensation algorithm, the output current error signal ΔIoout is converted into the output current feedback signal Ioc;

[0091] In this embodiment, the actual measured value of the output current Ioa and the setpoint value of the output current Ioset are obtained through the output current sampling circuit 31. The actual measured value of the output current Ioa represents the actual current currently supplied by the power supply system to the load, while the setpoint value of the output current Ioset is the ideal output current value expected by the system. By calculating the difference between the actual value and the setpoint value, the output current error signal ΔIoout is obtained, which reflects the deviation of the output current. The system converts the output current error signal ΔIoout into an output current feedback signal Ioc through a compensation algorithm, which is used to adjust the drive parameter calculation and processing module 5. This feedback signal ensures that the output current remains within the ideal range under different load conditions, thereby improving the output stability of the system and avoiding the impact of current fluctuations on the load.

[0092] Preferably, there are three negative feedback control loops: input current negative feedback control module, output current negative feedback control module, and output voltage negative feedback control module. Only one loop will actually work at any given time. However, in actual product operation, all loops are calculated in real time, but which loop works is determined by the working mode and the minimum value calculation.

[0093] S205. Obtain the actual measured value of the output voltage Voa and the set value of the output voltage Voset. Calculate the output voltage error signal ΔVoout based on the actual measured value of the output voltage Voa and the set value of the output voltage Voset. The calculation formula is: ΔVoout=Voset-Voa;

[0094] S206. Based on the loop negative feedback compensation algorithm, the output voltage error signal ΔVoout is converted into the output voltage feedback signal Voc.

[0095] In this embodiment, the actual measured output voltage value Voa and the output voltage setpoint Voset are obtained through the output voltage sampling circuit 41. The actual measured output voltage value Voa represents the actual output voltage currently supplied by the system to the load, while the output voltage setpoint Voset is the ideal output voltage desired by the system. By calculating the difference between the two, the output voltage error signal ΔVoout can be obtained, which is used to evaluate the deviation of the current output voltage. Based on the loop negative feedback compensation algorithm, the output voltage error signal ΔVoout is converted into an output voltage feedback signal Voc, which is fed back to the drive parameter calculation and processing module 5 for processing. Through this feedback signal, the system can adjust the output voltage in real time to ensure that the output voltage remains stable even under load changes or power fluctuations, thereby ensuring the safe operation and efficient power conversion of the entire system.

[0096] The compensator converts the error signal ΔIiout into an actual control signal Iic, which is the input current control signal. This signal represents the adjustment amount of the input current and is usually used as a control signal to drive the power conversion module, adjusting the operating state of the main power conversion module 1. Iic can be represented as a reference value for adjusting the input current. This signal is input to the drive parameter calculation and processing module 5 and is ultimately used to adjust the output power of the main power conversion module 1.

[0097] In summary, the compensation algorithm can transform the input current error signal ΔIiout, the output current error signal ΔIoout, and the output voltage error signal ΔVoout into the input current feedback signal Iic, the output current feedback signal Ioc, and the output voltage feedback signal Voc, respectively. This enables precise processing of each feedback signal, thereby ensuring accurate control of the input current, output current, and output voltage, improving the feedback control accuracy and response speed of the entire system, and ensuring the stability of the system under different operating conditions.

[0098] Specifically, such as Figure 6As shown, the step of controlling the drive parameter calculation and processing module 5 to process the output voltage feedback signal and the input current feedback signal, or to process the output voltage feedback signal and the output current feedback signal to generate a corresponding power drive signal, includes:

[0099] S401. If the drive parameter calculation and processing module 5 is controlled to process the output voltage feedback signal and the input current feedback signal, then the signal with the smallest amplitude among the output voltage feedback signal and the input current feedback signal is selected as the minimum value signal.

[0100] In this embodiment, the purpose of the control drive parameter calculation and processing module 5 in processing the output voltage feedback signal and the input current feedback signal is to ensure that the system prioritizes the processing of the most critical signals during operation through feedback control. During the operation of the power system, the output voltage feedback signal reflects the current voltage output of the system to the load, while the input current feedback signal reflects the input current between the battery and the main power conversion module 1. The drive parameter calculation and processing module 5 compares the amplitudes of these two feedback signals and selects the signal with the smallest amplitude as the minimum value signal. In the minimum value signal calculation stage, when processing the output voltage feedback signal and the input current feedback signal, the signal with the smaller amplitude takes effect, i.e., it is the parameter that is prioritized for control, while the other signal is used for limiting protection.

[0101] For example, in the core capacity mode, the input current is controlled. The voltage negative feedback loop is normally open in this mode, but once there is an abnormality (such as the failure of the sampling circuit), the input current negative feedback loop will also open, and the output voltage will rise. Then the output voltage negative feedback loop will automatically take over (the voltage feedback signal is smaller than the current feedback signal) and limit the output voltage to work at the set value.

[0102] S402. If the drive parameter calculation and processing module 5 is controlled to process the output voltage feedback signal and the output current feedback signal, then the signal with the smallest amplitude among the output voltage feedback signal and the output current feedback signal is selected as the minimum value signal.

[0103] In this embodiment, the control drive parameter calculation and processing module 5 processes the output voltage feedback signal and the output current feedback signal in normal operating mode. When the system supplies power to the load, the output voltage and output current feedback signals reflect the actual current voltage and current conditions, respectively. The drive parameter calculation and processing module 5 selects the signal with the smallest amplitude from these two feedback signals as the minimum value signal to determine which parameter needs to be adjusted first. For example, when load changes cause large fluctuations in the output voltage, the drive parameter calculation and processing module 5 will prioritize processing the output voltage feedback signal to ensure stable voltage output, avoid voltage fluctuations affecting the load, and ensure stable power supply to the system under different load conditions.

[0104] S403. Determine the corresponding driving signal based on the minimum value signal.

[0105] In this embodiment, determining the corresponding drive signal based on the minimum value signal means that the system generates a corresponding control signal using the minimum value signal. This drive signal may be a pulse width modulation (PWM) signal and / or a pulse frequency modulation (PFM) signal, used to adjust the operating state of the main power conversion module 1. This drive signal, by adjusting the operating frequency or duty cycle of the main power conversion module 1, achieves precise control of the power output, ensuring that the system can maintain stable current and voltage output under various operating conditions. For example, when the load current fluctuates significantly, the system will generate a suitable PWM signal using the minimum value signal to adjust the output current of the main power conversion module 1, ensuring stable power supply to the load and improving the overall efficiency of the system.

[0106] In summary, the drive parameter calculation and processing module 5 can process the output voltage feedback signal and the input current feedback signal, or process the output voltage feedback signal and the output current feedback signal, select the signal with the smallest amplitude as the minimum value signal, and generate the corresponding drive signal based on the minimum value signal. This ensures that the system can perform precise power control based on the actual feedback signal in different working modes, guarantee the stable operation of the system, and improve the system's response speed and output efficiency.

[0107] Specifically, in the step of determining the corresponding drive signal based on the minimum value signal, the drive signal includes at least a PWM signal and / or a PFM signal.

[0108] In this embodiment, the corresponding drive signal can be determined based on the minimum value signal to generate a PWM signal or a PFM signal, thereby adjusting the working state of the main power conversion module 1. This achieves precise adjustment of the system power output, improving the power conversion efficiency and control accuracy of the system under different load conditions, and ensuring efficient operation of the system under full capacity or normal operating conditions. Specifically, as shown... Figure 7As shown, the step of performing battery capacity verification based on predetermined preset capacity verification rules during a constant current capacity verification process includes:

[0109] S601. Based on the predetermined preset capacity rules, determine the approved interval length t. k ;

[0110] In this embodiment, determining the verification interval length based on the predetermined capacity verification rules means that the system predefines the sampling time interval during each capacity verification process according to the set capacity verification rules. For example, the system may set different sampling time intervals (such as per second or per minute) according to different types of batteries and application scenarios. The setting of the verification interval length directly affects the accuracy of capacity calculation. If the time interval is too long, current fluctuations may not be captured in time, while if the time interval is too short, it may increase the computational complexity. Therefore, a reasonable verification interval length can reduce the computational burden of the system while ensuring data accuracy and ensuring that current changes can be accurately captured throughout the discharge process.

[0111] S602. Real-time acquisition of the verified interval duration t k The discharge current value Ii of the internal storage battery k ;

[0112] In this embodiment, the real-time acquisition of the battery's discharge current value within the specified interval is achieved through an input current sampling circuit. Within each specified interval, the system continuously monitors and records the battery's discharge current value. This process ensures that the current value within each time period is accurately recorded, providing a basis for subsequent capacity calculations. The stability of the discharge current is crucial in the capacity assessment process, especially under constant current conditions. Ensuring accurate current sampling avoids deviations in the capacity assessment results caused by current fluctuations. For example, the system might collect and record the current value once per second to ensure a more accurate final capacity assessment.

[0113] S603, according to the approved interval duration t k and the discharge current value Ii k The rated battery capacity C is calculated using the formula C = ∑Ii k ×t k .

[0114] In this embodiment, the rated battery capacity C is calculated based on the rated interval duration and discharge current value by accumulating and calculating the collected current values. Battery capacity is typically calculated using an integral method, where the current value is multiplied by the time interval within each sampling period and then summed to obtain the total discharge capacity. The calculation formula is: C = Σ(I × Δt), where I is the current value within a certain time interval, and Δt is the rated interval duration. Through this segmented accumulation method, the system can accurately calculate the total capacity throughout the entire discharge process, thereby verifying whether the actual battery capacity meets the expected value. By accurately sampling the current and recording the time, the system can avoid capacity verification deviations, thus improving the accuracy of battery performance evaluation.

[0115] In summary, based on preset capacity calculation rules and combined with real-time acquired discharge current and time intervals, the battery capacity can be accurately calculated, ensuring a constant current during the battery capacity calculation process. This improves capacity calculation accuracy, avoids problems of battery capacity being too large or too small due to capacity calculation errors, and enhances battery life and the overall reliability of the power system.

[0116] Furthermore, battery capacity (AH) is determined by discharging the battery and calculating the final discharged capacity based on the integral of the product of the discharge current and the discharge time. In actual products, this is achieved by multiplying the current within a certain time interval (assuming the current remains constant within that time interval) by a specific interval and then summing the results, i.e., C = ∑Ii k ×t k , where t k For the duration of the above time interval, Ii k For t k The current value over a given time period, where C represents the rated battery capacity.

[0117] Furthermore, battery capacity is related to the discharge current. Generally, the higher the discharge current, the smaller the capacity the battery can discharge. In China, battery capacity is typically calibrated based on a 10-hour discharge rate, i.e., C10. If the discharge current deviates from 0.1C10, even if the current Ii... k Even with high sampling and timing accuracy, the calculated capacity will still deviate from the C10 capacity. This is because t k High-precision time control can be relatively easily achieved using clock chips or high-precision crystal oscillators. Therefore, the accuracy of the capacitor core mainly depends on the high-precision and stable control of the capacitor core discharge current.

[0118] To achieve stable and precise control of the discharge current, an input current negative feedback loop and a working mode control module are added. The working current of the power system is determined by the working mode control module whether it is controlled by the input current negative feedback loop (output Iic) or the output current negative feedback loop (output Ioc). Specifically, when the power system operates in the battery's full-capacity discharge state, the power system output voltage is set higher than the output bus voltage. At this time, the output voltage loop compensator will enter positive saturation (i.e., reaching the upper positive output limit, i.e., the voltage loop is open), and the input current negative feedback loop will activate, achieving a constant and stable discharge current. When the power system operates in normal mode, the output current negative feedback loop activates, and the power system outputs according to normal mode. Current protection or current limiting output is controlled by the output current negative feedback loop.

[0119] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0120] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A power supply system with dual current loop control, characterized in that, The dual current loop controlled power supply system includes a main power conversion module (1), an input current negative feedback control module (2), an output current negative feedback control module (3), an output voltage negative feedback control module (4), a working mode control module (6), and a drive parameter calculation and processing module (5). The power input terminal of the main power conversion module (1) is connected to the battery, and the power output terminal of the main power conversion module (1) is connected to the load. The signal acquisition terminal of the input current negative feedback control module (2) acquires the actual input current signal between the power input terminal of the main power conversion module (1) and the battery through a current acquisition device. The feedback signal output terminal of the input current negative feedback control module (2) is connected to the first signal selection terminal of the working mode control module (6). The signal acquisition terminal of the output current negative feedback control module (3) is connected to the first signal selection terminal of the working mode control module (6) through a current acquisition device. The actual output current signal between the power output terminal of the main power conversion module (1) and the load is obtained. The feedback signal output terminal of the output current negative feedback control module (3) is connected to the second signal selection terminal of the working mode control module (6). The feedback signal output terminal of the working mode control module (6) is connected to the first signal input terminal of the drive parameter calculation and processing module (5). The common node between the power output terminal of the main power conversion module (1) and the load is connected to the signal acquisition terminal of the output voltage negative feedback control module (4) to obtain the actual output voltage signal. The feedback signal output terminal of the output voltage negative feedback control module (4) is connected to the second signal input terminal of the drive parameter calculation and processing module (5). The signal output terminal of the drive parameter calculation and processing module (5) is connected to the drive signal input terminal of the main power conversion module (1). The input current negative feedback control module (2) includes an input current sampling circuit (21) and an input current loop compensator (22). The signal acquisition terminal of the input current sampling circuit (21) acquires the actual input current signal between the power input terminal of the main power conversion module (1) and the battery through a current acquisition device. After comparing the actual input current signal with the input current set value to generate the corresponding first current error signal, the input current loop compensator (22) is used to convert the first current error signal into the corresponding input current feedback signal. The feedback signal output terminal of the input current loop compensator (22) is connected to the first signal selection terminal of the working mode control module (6). The output current negative feedback control module (3) includes an output current sampling circuit (31) and an output current loop compensator (32). The signal acquisition terminal of the output current sampling circuit (31) acquires the actual output current signal between the power output terminal of the main power conversion module (1) and the battery through a current acquisition device. After comparing the actual output current signal with the output current set value to generate a corresponding second current error signal, the output current loop compensator (32) is used to convert the second current error signal into a corresponding output current feedback signal. The feedback signal output terminal of the output current loop compensator (32) is connected to the second signal selection terminal of the working mode control module (6). The output voltage negative feedback control module (4) includes an output voltage sampling circuit (41) and an output voltage loop compensator (42). The signal acquisition terminal of the output voltage sampling circuit (41) is connected to the power output terminal of the main power conversion module (1). After comparing the actual output voltage signal with the output voltage set value to generate the corresponding voltage error signal, the output voltage loop compensator (42) is used to convert the voltage error signal into the corresponding output voltage feedback signal. The voltage error signal output terminal of the output voltage loop compensator (42) is connected to the second signal input terminal of the drive parameter calculation and processing module (5).

2. The power supply system with dual current loop control according to claim 1, characterized in that, The drive parameter calculation and processing module (5) includes a minimum value calculation unit (51) and a drive parameter calculation unit (52). The first signal input terminal of the minimum value calculation unit (51) is connected to the feedback signal output terminal of the working mode control module (6), and the second signal input terminal of the minimum value calculation unit (51) is connected to the feedback signal output terminal of the output voltage negative feedback control module (4). The minimum value calculation unit (51) is used to calculate the corresponding minimum value signal based on the feedback signals output by the working mode control module (6) and the output voltage negative feedback control module (4). The minimum value signal output terminal of the minimum value calculation unit (51) is connected to the minimum value signal input terminal of the drive parameter calculation unit (52). The drive parameter calculation unit (52) is used to determine the corresponding power drive signal based on the minimum value signal. The power drive signal output terminal of the drive parameter calculation unit (52) is connected to the drive signal input terminal of the main power conversion module (1).

3. A method for capacity control of a power supply system based on dual current loop control, applied to a power supply system with dual current loop control as described in any one of claims 1-2, characterized in that, The nuclear capacity method includes the following steps: Control the battery to discharge; Acquire the input current feedback signal, output current feedback signal, and output voltage feedback signal; Obtain the operating mode information of the power system, determine the output state of the operating mode control module based on the operating mode information, and send an input current feedback signal or an output current feedback signal to the drive parameter calculation and processing module based on the output state. The drive parameter calculation and processing module is controlled to process the output voltage feedback signal and the input current feedback signal, or to process the output voltage feedback signal and the output current feedback signal, in order to generate a corresponding power drive signal; Based on the power drive signal, the main power conversion module is controlled to switch to the corresponding working state to ensure that the current in the capacitance process remains constant. Based on the predetermined preset capacity determination rules, the capacity determination operation of the battery is performed during the capacity determination process with constant current.

4. The capacity control method for a power supply system based on dual current loop control according to claim 3, characterized in that, The steps of acquiring the input current feedback signal, the output current feedback signal, and the output voltage feedback signal include: Obtain the actual measured value of the input current Iia and the set value of the input current Iiset. Based on the actual measured value of the input current Iia and the set value of the input current Iiset, calculate the input current error signal ΔIiout. The calculation formula is: ΔIiout=Iiset-Iia; Based on the loop negative feedback compensation algorithm, the input current error signal ΔIiout is transformed into the input current feedback signal Iic. Obtain the actual measured value of the output current Ioa and the set value of the output current Ioset. Based on the actual measured value of the output current Ioa and the set value of the output current Ioset, calculate the output current error signal ΔIoout. The calculation formula is: ΔIoout=Ioset-Ioa. Based on the loop negative feedback compensation algorithm, the output current error signal ΔIoout is transformed into the output current feedback signal Ioc; Obtain the actual measured value of the output voltage Voa and the set value of the output voltage Voset. Based on the actual measured value of the output voltage Voa and the set value of the output voltage Voset, calculate the output voltage error signal ΔVoout. The calculation formula is: ΔVoout = Voset - Voa. Based on the loop negative feedback compensation algorithm, the output voltage error signal ΔVoout is transformed into the output voltage feedback signal Voc.

5. The capacity control method for a power supply system based on dual current loop control according to claim 3, characterized in that, The step of controlling the drive parameter calculation and processing module to process the output voltage feedback signal and the input current feedback signal, or to process the output voltage feedback signal and the output current feedback signal to generate a corresponding power drive signal, includes: If the drive parameter calculation and processing module processes the output voltage feedback signal and the input current feedback signal, then the signal with the smallest amplitude among the output voltage feedback signal and the input current feedback signal is selected as the minimum value signal; If the drive parameter calculation and processing module processes the output voltage feedback signal and the output current feedback signal, then the signal with the smallest amplitude among the output voltage feedback signal and the output current feedback signal is selected as the minimum value signal. The corresponding driving signal is determined based on the minimum value signal.

6. The capacity control method for a power supply system based on dual current loop control according to claim 5, characterized in that, In the step of determining the corresponding drive signal based on the minimum value signal, the drive signal includes at least a PWM signal and / or a PFM signal.

7. The capacity control method for a power supply system based on dual current loop control according to claim 3, characterized in that, The step of performing battery capacity verification based on predetermined preset capacity verification rules during a constant current capacity verification process includes: Based on the established preset capacity control rules, the approved interval length is determined. ; Real-time acquisition of the approved interval duration Discharge current value of internal storage battery ; According to the approved interval duration and the discharge current value Calculate the rated battery capacity C using the following formula: .

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