Power supply system controlled by double current loops and capacity checking method thereof

Abstract

The invention relates to a power supply system controlled by double current loops and a capacity checking method thereof, and 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, and 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. A feedback signal output end of the working mode control module is connected with a first signal input end of the driving parameter calculating and processing module, a feedback signal output end of the output voltage negative feedback control module is connected with a second signal input end of the driving parameter calculating and processing module, and the system can ensure accurate adjustment of current under various working conditions. The problem of low capacity checking precision caused by efficiency fluctuation and unstable input current of the power conversion module is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of a power supply system controlled by a dual current loop, and in particular to a power supply system controlled by a dual current loop and a capacity control method thereof. Background Art

[0002] At present, the traditional method of battery capacity verification usually adopts the offline discharge method. Although the technology is mature, there are problems such as power waste, high heat, and low efficiency. In order to solve this problem, the existing technology began to use the power module to discharge the battery to verify the capacity, but only adjust the output voltage and output current. The input current is also adjusted by adjusting the output current after sampling the current comparison. However, due to the efficiency fluctuations of the power conversion module under different working conditions, it is difficult for the traditional method to achieve precise control of the input current. When the input current cannot be accurately controlled, the discharge current will change with the fluctuations of the efficiency of the main power conversion module and the input voltage, resulting in current instability. Since the capacity calculation of the battery is based on the product of the discharge current and the discharge time, if the current fluctuates greatly, the capacity verification result will be inaccurate and deviate from the actual value, thereby reducing the accuracy of the verification capacity. Summary of the invention

[0003] In order to solve the problem of how to accurately control the discharge current to avoid the problem of low battery capacity verification accuracy caused by power conversion module efficiency fluctuations and input current instability, the present application provides a dual current loop controlled power supply system and a capacity verification method thereof.

[0004] A power supply system with dual current loop control, the power supply system with dual current loop control comprising 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 processing module, the power input end of the main power conversion module is connected to a battery, the power output end of the main power conversion module is connected to a load, the signal acquisition end of the input current negative feedback control module acquires the actual input current signal between the power input end of the main power conversion module and the battery through a current acquisition device, the feedback signal output end of the input current negative feedback control module is connected to the first signal selection end of the working mode control module, and the signal acquisition end of the output current negative feedback control module acquires the actual input current signal between the power input end of the main power conversion module and the battery through a current acquisition device, the feedback signal output end of the input current negative feedback control module is connected to the first signal selection end of the working mode control module, and the signal acquisition end of the output current negative feedback control module acquires the actual input current signal between the power input end of the main power conversion module and the battery through a current acquisition device. The acquisition device acquires 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 processing module, the common node between the power output terminal and the load of the main power conversion module 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 processing module, and the signal output terminal of the drive parameter calculation 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 collects the actual input current signal through the input current negative feedback control module, the output current negative feedback control module collects the actual output current signal provided by the main power conversion module to the load, and the output voltage negative feedback control module collects the actual output voltage signal at the load end; then, the working mode control module selects the feedback signal that needs to be controlled first according to the working mode of the current system (such as the core capacity mode or the normal power supply mode) (such as the input current feedback signal is preferentially selected in the core capacity, and the output current feedback signal is selected in the normal mode); the signal is processed by the driving parameter calculation processing module to generate corresponding PWM and / or PFM signals, which are used to adjust the working state of the main power conversion module, control its switching frequency and / or duty cycle, so as to accurately adjust the input current or output current; when the system is in the battery core capacity mode, the system adjusts the discharge current of the battery through the input current negative feedback control module to ensure the stability of the discharge current and realize high-precision capacity verification. In the normal power supply mode, the output current negative feedback control module and the output voltage negative feedback control module ensure the stable power supply and current protection of the system by adjusting the output current and output voltage. Through this dual-loop control mechanism, the system can ensure accurate current regulation under various operating conditions, solving the problem of low core capacity accuracy caused by power conversion module efficiency fluctuations and input current instability.

[0006] Preferably, the input current negative feedback control module includes an input current sampling circuit and an input current loop compensator. The signal acquisition end of the input current sampling circuit obtains the actual input current signal between the power input end 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 end of the input current loop compensator is connected to the first signal selection end of the working mode control module.

[0007] By adopting the above technical solution, real-time monitoring of the input current can be achieved 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 has a correction effect on the input current, ensuring that the input current remains stable during the battery discharge process, thereby improving the accuracy of the system's battery capacity verification, avoiding inaccurate capacity verification results due to input current fluctuations, and thus improving the system's control accuracy and capacity verification 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 end of the output current sampling circuit obtains the actual output current signal between the power output end 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 end of the output current loop compensator is connected to the second signal selection end of the working mode control module.

[0009] By adopting the above technical solution, the output current can be accurately collected and feedback controlled through the combination of the output current sampling circuit and the output current loop compensator, ensuring that the system can respond quickly and adjust when the output current fluctuates, thereby ensuring the output current stability of the power supply system in the normal working mode, avoiding the impact of current fluctuations on the load, and 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 end of the output voltage sampling circuit is connected to the power output end of the main power conversion module. After comparing the actual output voltage signal and the output voltage setting 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 end of the output voltage loop compensator is connected to the second signal input end of the drive parameter calculation and processing module.

[0011] By adopting the above technical solution, the system can ensure accurate collection and feedback regulation of the output voltage through the combination of the output voltage sampling circuit and the output voltage loop compensator, especially under different load conditions, it can achieve precise voltage regulation and ensure the stability of the output voltage, thereby improving the voltage control accuracy of the system under various working conditions and ensuring the safety and stability of the system operation.

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

[0013] By adopting the above technical solution, the minimum value signal in the feedback signal 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, and an appropriate drive signal can be generated according to the minimum value signal, thereby ensuring that the system selects a suitable negative feedback control loop in different working modes, ensuring the stability of the output voltage and current, and improving the response speed and control accuracy of the system.

[0014] A capacity control method for a power supply system based on dual current loop control is applied to a power supply system based on dual current loop control. The control method comprises the following steps: Control the battery to discharge; Obtaining an input current feedback signal, an output current feedback signal, and an output voltage feedback signal; Acquire working mode information of the power supply system, determine the output state of the working mode control module according to the working mode information, and send an input current feedback signal or an output current feedback signal to the driving parameter calculation processing module based on the output state; Controlling the driving parameter calculation 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, so as to generate a corresponding power driving signal; Based on the power driving signal, the main power conversion module is controlled to switch to a corresponding working state to ensure a constant current in the nuclear capacity process; Based on the determined preset capacity verification rules, the capacity verification operation of the battery is performed during the capacity verification process with constant current.

[0015] By adopting the above technical solution, it is possible to control the discharge of the battery and combine the acquisition of the input current feedback signal, the output current feedback signal and the output voltage feedback signal to achieve precise control of the entire capacity verification process, ensure the stability of the current during the battery discharge process, thereby improving the accuracy of battery capacity verification, avoiding inaccurate capacity verification results due to current fluctuations, and improving the overall efficiency and reliability of the power supply system.

[0016] Preferably, the step of obtaining the input current feedback signal, the output current feedback signal and the output voltage feedback signal comprises: Obtain an actual measured value of the input current Iia and an input current setting value Iiset, and calculate an input current error signal ΔIiout according to the actual measured value of the input current Iia and the input current setting value Iiset, the calculation formula is: ΔIiout=Iiset-Iia; Based on a loop negative feedback compensation algorithm, converting the input current error signal ΔIiout into an input current feedback signal Iic; Obtain an actual measured value of the output current Ioa and an output current setting value Ioset, and calculate an output current error signal ΔIoout according to the actual measured value of the output current Ioa and the output current setting value Ioset, the calculation formula is: ΔIoout=Ioset-Ioa; Based on a loop negative feedback compensation algorithm, converting the output current error signal ΔIoout into an output current feedback signal Ioc; Obtain an actual measured value of the output voltage Voa and an output voltage setting value Voset, and calculate an output voltage error signal ΔVoout according to the actual measured value of the output voltage Ioa and the output voltage setting value Voset, the calculation formula is: ΔVoout=Voset-Voa; Based on a loop negative feedback compensation algorithm, the output voltage error signal ΔVoout is converted into an output voltage feedback signal Voc.

[0017] 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 converted into the input current feedback signal Iic, the output current feedback signal Ioc and the output voltage feedback signal Voc through the compensation algorithm, so as to achieve accurate processing of each feedback signal, thereby ensuring the system's precise 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 working conditions.

[0018] Preferably, the step of controlling the driving parameter calculation processing module to process the output voltage feedback signal and the input current feedback signal, or processing the output voltage feedback signal and the output current feedback signal to generate a corresponding power driving signal includes: If the driving parameter calculation and processing module is controlled to process the output voltage feedback signal and the input current feedback signal, the signal with the smallest amplitude is selected from the output voltage feedback signal and the input current feedback signal as the minimum signal; if the driving parameter calculation and processing module is controlled to process the output voltage feedback signal and the output current feedback signal, the signal with the smallest amplitude is selected from the output voltage feedback signal and the output current feedback signal as the minimum signal; and the corresponding driving signal is determined based on the minimum signal.

[0019] By adopting the above technical solution, the output voltage feedback signal and the input current feedback signal can be processed by the drive parameter calculation processing module, or the output voltage feedback signal and the output current feedback signal can be processed, the signal with the smallest amplitude is selected as the minimum signal, and the corresponding drive signal is generated according to the minimum signal, thereby ensuring that the system performs accurate power control according to the actual feedback signal in different working modes, ensuring the stable operation of the system, and improving the response speed and output efficiency of the system.

[0020] Preferably, in the step of determining a corresponding driving signal according to the minimum value signal, the driving signal at least includes a PWM signal and / or a PFM signal.

[0021] By adopting the above technical solution, it is possible to determine the corresponding driving signal according to the minimum signal, generate a PWM signal or a PFM signal, adjust the working state of the main power conversion module, and achieve precise adjustment of the system power output, thereby improving the power conversion efficiency and control accuracy of the system under different load conditions, and ensuring the efficient operation of the system under core capacity or normal working conditions.

[0022] Preferably, the step of performing the capacity verification operation of the battery in the capacity verification process with constant current based on the determined preset capacity verification rule includes: Based on the preset capacity verification rules, determine the verification interval time t k ; Real-time acquisition of the approved interval duration t k Discharge current value of internal battery Ii k ; According to the approved interval time t k and the discharge current value Ii k , calculate the rated battery capacity C, the calculation formula is C = ∑Ii k ×tk .

[0023] By adopting the above technical solution, the capacity of the battery can be accurately calculated based on the preset capacity verification rules combined with the discharge current and time interval obtained in real time, ensuring that the current is constant during the battery capacity verification process, thereby improving the capacity verification accuracy, avoiding the problem of battery capacity being too large or too small due to capacity verification errors, and increasing the battery life and the overall reliability of the power system.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: The present application collects the actual input current signal through the input current negative feedback control module, the output current negative feedback control module collects the actual output current signal provided by the main power conversion module to the load, and the output voltage negative feedback control module collects the actual output voltage signal at the load end; then, the working mode control module selects the feedback signal that needs to be controlled first (such as the input current feedback signal is selected first in the core capacity, and the output current feedback signal is selected in the normal mode) according to the working mode of the current system (such as the core capacity mode or the normal power supply mode); the signal is processed by the driving parameter calculation processing module to generate corresponding PWM and / or PFM signals, which are used to adjust the working state of the main power conversion module, control its switching frequency or duty cycle, so as to accurately adjust the input current or output current; when the system is in the battery core capacity mode, the system adjusts the discharge current of the battery through the input current negative feedback control module to ensure the stability of the discharge current and realize high-precision capacity verification. In the normal power supply mode, the output current negative feedback control module and the output voltage negative feedback control module ensure the stable power supply and current protection of the system by adjusting the output current and output voltage. Through this dual-loop control mechanism, the system can ensure accurate current regulation under various operating conditions, solving the problem of low core capacity accuracy caused by fluctuations in the efficiency of the main power conversion module and unstable input current. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flowchart of a power supply system with dual current loop control in one embodiment of the present application.

[0026] Figure 2 It is a specific implementation flow chart of a power supply system with dual current loop control in one embodiment of the present application.

[0027] Figure 3 It is a specific implementation flow chart of the power supply system of Technology 2 in the prior art of this application.

[0028] Figure 4 It is a flow chart of a power supply system with dual current loop control in one embodiment of the present application.

[0029] Figure 5This is a flowchart for implementing step S20 in a power supply system with dual current loop control in one embodiment of the present application; Figure 6 This is a flowchart for implementing step S40 in a power supply system with dual current loop control in one embodiment of the present application; Figure 7 This is a flowchart for implementing step S60 in a power supply system with dual current loop control in one embodiment of the present application; Description of reference numerals: 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. Working mode control module. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings.

[0031] In one embodiment, if Figure 1 As shown, the present application discloses a power supply system with dual current loop control, which specifically includes the following steps: A power supply system with dual current loop control, the power supply system with dual current loop control comprising 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 processing module 5, the power input end of the main power conversion module 1 is connected to a battery, the power output end of the main power conversion module 1 is connected to a load, the signal acquisition end of the input current negative feedback control module 2 obtains the actual input current signal between the power input end of the main power conversion module 1 and the battery through a current acquisition device, the feedback signal output end of the input current negative feedback control module 2 is connected to the first signal selection end of the working mode control module 6, the signal acquisition end of the output current negative feedback control module 3 is connected to the first signal selection end of the working mode control module 6, and the signal acquisition end of the output current negative feedback control module 3 is connected to the first signal selection end of the working mode control module 6. The current acquisition device obtains 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 processing module 5, the common node between the power output terminal and the load of the main power conversion module 1 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 processing module 5, and the signal output terminal of the drive parameter calculation processing module 5 is connected to the drive signal input terminal of the main power conversion module 1.

[0032] In this embodiment, the application collects the actual input current signal through the input current negative feedback control module 2, the output current negative feedback control module 3 collects the actual output current signal provided by the main power conversion module 1 to the load, and the output voltage negative feedback control module 4 collects the actual output voltage signal at the load end; then, the working mode control module 6 selects the feedback signal that needs to be controlled first according to the working mode of the current system (such as the core capacity mode or the normal power supply mode) (such as the input current feedback signal is preferentially selected in the core capacity, and the output current feedback signal is selected in the normal mode); the signal is processed by the driving parameter calculation processing module 5 to generate corresponding PWM and / or PFM signals, which are used to adjust the working state of the main power conversion module 1, control its switching frequency or duty cycle, so as to accurately adjust the input current or output current; when the system is in the battery core capacity mode, the system adjusts the discharge current of the battery through the input current negative feedback control module 2 to ensure the stability of the discharge current and realize high-precision capacity verification. In the normal power supply mode, the output current negative feedback control module 3 and the output voltage negative feedback control module 4 ensure the stable power supply and current protection of the system by adjusting the output current and output voltage. Through this dual-loop control mechanism, the system can ensure accurate current regulation under various operating conditions, solving the problem of low core capacity accuracy caused by power conversion module efficiency fluctuations and input current instability.

[0033] Specifically, 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 end of the input current sampling circuit 21 obtains the actual input current signal between the power input end 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 setting 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 end of the input current loop compensator 22 is connected to the first signal selection end of the working mode control module 6.

[0034] In this embodiment, in the dual current loop control system, the connection logic between the various ports of the input current negative feedback control module 2 reflects the workflow of accurate monitoring and error compensation of the input current. The signal acquisition end of the input current sampling circuit 21 is connected to the power input end of the main power conversion module 1, and is used to collect the actual input current signal from the battery to the main power conversion module 1 in real time. This acquisition signal represents the actual value of the 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 end 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, and performs compensation adjustment through a control algorithm (such as PID control) to generate a corresponding compensation signal. Subsequently, the feedback signal output end of the input current loop compensator 22 transmits the compensated signal to the first signal selection end of the working mode control module 6, which is used to further determine 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 working conditions and achieve stable control of the input current by real-time acquisition and compensation of input current errors. Especially in the capacity verification process, this precise input current control can effectively improve the accuracy of battery capacity verification and ensure efficient operation and stable output of the system.

[0035] In summary, through the combination of 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 to ensure that the input current remains stable during the battery discharge process, thereby improving the accuracy of the system in battery capacity verification and avoiding inaccurate capacity verification results due to input current fluctuations, thereby improving the control accuracy and capacity verification efficiency of the system.

[0036] Specifically, 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 end of the output current sampling circuit 31 obtains the actual output current signal between the power output end 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 setting 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 end of the output current loop compensator 32 is connected to the second signal selection end of the working mode control module 6.

[0037] In this embodiment, in the system, the output current negative feedback control module 3 realizes real-time monitoring and precise control of the output current through the connection of its various ports. Specifically, the current acquisition converts the main power current into a voltage or a small current signal through a current acquisition device such as a shunt or a Hall sensor or a current transformer, and the converted signal enters the acquisition circuit, thereby reflecting the actual current provided by the system to the load. The sampling circuit converts the 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 of the output current and the set value. 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 to the second signal selection terminal of the working mode control module 6 through its output terminal, so that the working mode control module 6 can judge and select a suitable negative feedback loop. Under different working conditions, the working mode control module 6 determines the most suitable negative feedback loop for the current operation according to the feedback signals of the input current and the output current, so as to ensure the stability and output accuracy of the system. The entire control logic relies on the real-time acquisition of the output current signal, and ensures the stability and accuracy of the output current through the adjustment of the compensator. Especially in the normal working 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.

[0038] In summary, through the combination of the output current sampling circuit 31 and the output current loop compensator 32, accurate collection and feedback control of the output current can be achieved, ensuring that the system can respond quickly and adjust when the output current fluctuates, thereby ensuring the output current stability of the power supply system in the normal working mode, avoiding the impact of current fluctuations on the load, and improving the output stability and control accuracy of the system.

[0039] Specifically, 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 end of the output voltage sampling circuit 41 is connected to the power output end of the main power conversion module 1. After comparing the actual output voltage signal and the output voltage setting 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 end of the output voltage loop compensator 42 is connected to the second signal input end of the drive parameter calculation and processing module 5.

[0040] In this embodiment, in this system, the connection relationship of each port of the output voltage negative feedback control module 4 ensures accurate control and real-time feedback of the output voltage. Specifically, the signal acquisition end of the output voltage sampling circuit 41 is connected to the power output end of the main power conversion module 1, and the actual voltage value output to the load by the real-time acquisition system. The sampling circuit converts the collected output voltage signal into a feedback signal, and transmits it to the voltage error signal input end of the output voltage loop compensator 42 through its feedback signal output end. 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. The compensation signal is sent from the voltage error signal output end of the output voltage loop compensator 42 to the second signal input end of the drive parameter calculation processing module 5, and the drive parameter calculation processing module 5 generates a drive signal according to the signal for adjusting the working state of the main power conversion module 1. The entire control logic collects and compensates for output voltage errors in real time to ensure that the system can maintain the stability and accuracy of the output voltage under different load conditions. In particular, when power demand fluctuates or load changes, it can quickly adjust the voltage output to ensure stable operation of the load and prevent system instability or damage caused by voltage fluctuations.

[0041] In summary, the combination of the output voltage sampling circuit 41 and the output voltage loop compensator 42 can ensure that the system can accurately collect and feedback-regulate the output voltage, especially under different load conditions, and can achieve precise voltage regulation to ensure the stability of the output voltage, thereby improving the voltage control accuracy of the system under various working conditions and ensuring the safety and stability of the system operation.

[0042] Specifically, Figure 2 As shown, the driving parameter calculation processing module 5 includes a minimum value calculation unit 51 and a driving parameter calculation unit 52. The first signal input end of the minimum value calculation unit 51 is connected to the feedback signal output end of the working mode control module 6, and the second signal input end of the minimum value calculation unit 51 is connected to the feedback signal output end of the output voltage negative feedback control module 4. The minimum value calculation unit 51 is used to calculate the corresponding minimum value signal according to 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 end of the minimum value calculation unit 51 is connected to the minimum value signal input end of the driving parameter calculation unit 52, and the driving parameter calculation unit 52 is used to determine the corresponding power drive signal according to the minimum value signal, and the power drive signal output end of the driving parameter calculation unit 52 is connected to the drive signal input end of the main power conversion module 1.

[0043] In this embodiment, in the system, the driving parameter calculation processing module 5 realizes precise control of the system through the cooperation of the minimum value calculation unit 51 and the driving parameter calculation unit 52. The first signal input end of the minimum value calculation unit 51 is connected to the feedback signal output end of the working mode control module 6, and is used to receive the feedback signal from the working mode control module 6, and the second signal input end is connected to the feedback signal output end of the output voltage negative feedback control module 4, and is used to obtain the feedback signal of the output voltage. The task of the minimum value calculation unit 51 is to compare the signals from the working 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 according to these feedback signals. 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 the minimum value signal to the driving parameter calculation unit 52 through its output end. The driving parameter calculation unit 52 calculates the corresponding power drive signal according to the received minimum value signal, and the drive signal is used to adjust the working 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 terminal of the main power conversion module 1 through its output terminal to control the output characteristics of the main power conversion module 1. The entire control logic selects the feedback signal through the minimum value calculation unit 51 to ensure that the system prioritizes the adjustment of the parameters that need the most attention under different working conditions, and generates accurate drive signals through the drive parameter calculation unit 52 to ensure the efficient operation and output stability of the main power conversion module 1. This mechanism can optimize the adjustment capability of the system under complex working conditions and ensure the stable output of the power supply system.

[0044] In summary, through the combination of the minimum value calculation unit 51 and the drive parameter calculation unit 52, the minimum value signal in the feedback signal 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 according to the minimum value signal, thereby ensuring that the system selects a suitable negative feedback control loop in different working modes, ensuring the stability of the output voltage and current, and improving the response speed and control accuracy of the system.

[0045] like Figure 4 As shown, a capacity control 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 comprises the following steps: S10, controlling the battery to discharge; In this embodiment, controlling the battery to discharge means guiding the energy output of the battery through the main power conversion module 1 so that it supplies power to the system load or the nuclear capacity test equipment. The purpose of discharge is to verify the actual capacity of the battery. By controlling the discharge rate and duration of the battery, the current is ensured to be constant, thereby providing a basis for subsequent capacity verification. The discharge process needs to cooperate with the power conversion module to ensure the stable output of the current, so as to maintain a constant current throughout the discharge process in order to accurately measure the remaining capacity of the battery.

[0046] S20, obtaining an input current feedback signal, an output current feedback signal, and an output voltage feedback signal; In this embodiment, obtaining the input current feedback signal, the output current feedback signal and the output voltage feedback signal refers to respectively collecting the real-time values ​​of the actual input current, the output current and the output voltage through the input current sampling circuit 21, the output current sampling circuit 31 and the output voltage sampling circuit 41. The input current feedback signal represents the actual current value when the battery is discharged, the output current feedback signal represents the current size provided by the power supply system to the load, and the output voltage feedback signal reflects the actual output voltage of the system. These signals are transmitted to the working mode control module 6 in real time through the feedback control module to provide a basis for subsequent mode selection and feedback adjustment.

[0047] S30, obtaining working mode information of the power supply system, determining the output state of the working mode control module 6 according to the working mode information, and sending an input current feedback signal or an output current feedback signal to the driving parameter calculation processing module 5 based on the output state; In this embodiment, the working mode information of the power supply system is obtained by detecting the current working state of the system (such as the battery capacity verification discharge mode or the normal working mode), and determining the required control strategy according to the requirements of different modes. According to the working mode information, the working mode control module 6 will output the corresponding signal state and select the feedback signal that needs to be controlled preferentially in the current working mode. In the battery discharge mode, the input current feedback signal is usually preferred to keep the discharge current constant, while in the normal working mode, the output current feedback signal may be selected to ensure the stability of the system output; here, the working mode information of the power supply system determines the current operating state of the system, and thus affects the selection of the negative feedback control loop. When the power supply system is in the battery capacity verification mode, the goal of the system is to accurately control the discharge current of the battery in order to perform high-precision capacity verification. In this mode, it is very important to maintain a constant input current, because the fluctuation of the input current will directly affect the accuracy of the capacity verification result. Therefore, the working mode control module 6 will give priority to the input current feedback signal, and ensure the stability of the discharge current by real-time monitoring and adjustment of the input current, thereby ensuring the accuracy of the capacity verification. When the system is in normal power supply mode, the main task of the system is to provide a stable output current for the load to meet the power demand of the load and ensure normal power supply. In this case, the stability of the output current is crucial to the reliability of the system operation, so the working mode control module 6 will select the output current feedback signal. At this time, the control of the output current is only for current limiting protection. The module actually works in the output voltage negative feedback control loop, that is, constant voltage output, to prevent current fluctuations from affecting the load. This selection is based on the priority control requirements in different modes to ensure that the system can be adjusted and feedback controlled in the best way under different working conditions.

[0048] S40, controlling the driving parameter calculation 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, so as to generate a corresponding power driving signal; In this embodiment, the purpose of controlling the drive parameter calculation 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 is to ensure that the system can give priority to processing the most important feedback signal under different working conditions. After receiving these feedback signals, the drive parameter calculation processing module 5 will select the signal with the smallest amplitude in the feedback signal through the minimum value calculation unit 51, so as to ensure that the system gives priority to adjusting the key current or voltage parameters and ensure the stability of the output. For example, in the battery discharge mode, the drive parameter calculation processing module 5 will give priority to processing the input current feedback signal to ensure constant current.

[0049] S50, based on the power driving signal, controlling the main power conversion module 1 to switch to a corresponding working state to ensure a constant current in the nuclear capacity process; In this embodiment, controlling the main power conversion module 1 to switch to the corresponding working state based on the power drive signal refers to adjusting the operation mode of the main power conversion module 1 according to the drive signal generated by the drive parameter calculation processing module 5. The control signal may be a PWM signal that adjusts the duty cycle and / or a PFM signal that adjusts 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 the battery discharge process, thereby improving the accuracy and efficiency of the nuclear capacity process.

[0050] S60: Based on the determined preset capacity verification rule, perform a capacity verification operation of the battery in a capacity verification process with a constant current.

[0051] In this embodiment, based on the preset capacity verification rules, the capacity verification operation of the battery is performed in the process of constant current verification, which means that the actual capacity of the battery is accurately verified by accumulating the integral of current and time while ensuring the current is constant. For example, the system can sample and accumulate the current at a certain time interval, and finally calculate the discharge capacity of the battery. In this way, the actual remaining capacity of the battery can be accurately verified, thereby providing data support for system maintenance and battery replacement, and improving the reliability and safety of the power supply system.

[0052] In summary, by controlling the discharge of the battery and combining the acquisition of the input current feedback signal, the output current feedback signal and the output voltage feedback signal, the precise control of the entire capacity verification process can be achieved, ensuring the stability of the current during the battery discharge process, thereby improving the accuracy of battery capacity verification, avoiding inaccurate capacity verification results due to current fluctuations, and improving the overall efficiency and reliability of the power supply system.

[0053] A further explanation of the prior art is that in the field of backup power, the battery, as the core component of the uninterruptible power supply system, is the last guarantee for the uninterruptible power supply system to provide power to the load in the event of an AC power outage or abnormality. The battery is a life device, and its capacity decays according to its operating conditions and time. When the capacity decays to a certain extent, it will not be able to provide power to the load for a certain time limit, thereby causing losses to the users of the uninterruptible power supply system. Especially in some important fields, such as the field of electric power operation, when a power accident occurs, the AC power is lost, and the remaining capacity of the battery cannot meet the power demand of the back-end equipment operation application, it often causes serious consequences and losses such as the expansion of the accident and the accident leapfrogging. Therefore, in important fields, there is often a need to regularly verify the actual capacity of the battery to ensure that the battery has sufficient backup power to meet the back-end load application needs.

[0054] That is, the current battery capacity verification generally adopts: Technology 1: The battery is offline (detached from the power system bus) and discharged with a discharger to detect and calculate the actual capacity of the battery. Advantages: simple and mature technology; Disadvantages: waste of electric energy, not environmentally friendly; the discharger generally adopts resistive discharge, generates a lot of heat, and has a fire risk; Technology 2: With the development of technology and environmental protection requirements, it is gradually transitioning to the use of power modules (including DC to DC conversion power modules and DC to AC inverter power modules) to discharge and verify the capacity of the battery, and convert the electric energy discharged by the battery into DC or AC power required by the on-site load for use by the on-site load, or convert it into AC to feed back to the power grid. When discharging the nuclear capacity, it is generally achieved by controlling the output voltage and / or current of the power module.

[0055] You can refer to Figure 3 Since what is controlled is the output voltage Vou and / or current Iout, rather than the input current Iin, the efficiency η of the main power conversion under different working conditions is different, and when the input voltage is different Vin, the input current cannot be accurately controlled.

[0056] However, it cannot be precisely controlled, so this application is required to adjust the input current to be constant in order to improve the accuracy of the core capacity. This application includes 1 output current negative feedback loop and 1 input current negative feedback loop and an operating mode controller. The operating mode controller determines whether the output current negative feedback loop or the input current negative feedback loop is effective according to user settings or program settings. When the input current negative feedback loop is effective, the output voltage negative feedback loop should operate in an open-loop state. The open-loop state is generally achieved by setting a voltage higher than the output voltage bus, and achieving natural saturation (i.e. reaching the compensator output upper limit) by the integral link in the loop compensator of the output voltage negative feedback loop. The main power conversion can be DC / DC or DC / AC, and the topology of the main power conversion 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 at least includes an integral link. The loop compensator can be one of the automatic control negative feedback loop compensators, or a combination of several, such as a common PID compensator. Compared with technology 1, the energy discharged by the core capacity of this application is provided to the conventional load consumption of the power supply system, and there is no additional waste of electricity, which is energy-saving and environmentally friendly; and this solution will use a high-frequency switching power supply module with a small size. Compared with technology 2, this application has a higher core capacity accuracy, which can avoid the actual backup time being insufficient due to the large core capacity result, thereby introducing the potential accident caused by the insufficient backup time, and can avoid the premature scrapping or retirement of the battery due to the small core capacity result, thereby reducing waste or loss. Specifically, Figure 5 As shown, the step of obtaining the input current feedback signal, the output current feedback signal and the output voltage feedback signal includes: S201, obtaining an actual measured value of input current Iia and an input current setting value Iiset, and calculating an input current error signal ΔIiout according to the actual measured value of input current Iia and the input current setting value Iiset, the calculation formula is: ΔIiout=Iiset-Iia; S202, based on a loop negative feedback compensation algorithm, converting the input current error signal ΔIiout into an input current feedback signal Iic; In this embodiment, obtaining the input current actual measurement value Iia and the input current setting value Iiset is completed by the input current sampling circuit 21. The input current actual measurement value Iia represents the actual input current when the battery is currently discharging, while the input current setting value 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 setting 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 will be converted into an input current feedback signal Iic as a control signal for adjusting the main power conversion module 1 to ensure that the input current remains stable during the entire discharge process. The compensation process can be implemented through a PID control algorithm, so that the system can quickly respond to current fluctuations and make corresponding adjustments.

[0057] S203, obtaining an actual measured value of the output current Ioa and an output current setting value Ioset, and calculating an output current error signal ΔIoout according to the actual measured value of the output current Ioa and the output current setting value Ioset, the calculation formula being: ΔIoout=Ioset-Ioa; S204, based on a loop negative feedback compensation algorithm, converting the output current error signal ΔIoout into an output current feedback signal Ioc; In this embodiment, obtaining the actual measured value of the output current Ioa and the set value of the output current Ioset is achieved through the output current sampling circuit 31. The actual measured value of the output current Ioa represents the actual current currently provided by the power supply system to the load, while the set 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 set value, the output current error signal ΔIoout is obtained, which is used to reflect 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 is maintained 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; Preferably, of the three negative feedback control loops, namely the input current negative feedback control module, the output current negative feedback control module, and the output voltage negative feedback control module, only one loop will actually work at the same time; but when the actual product is running, all will be calculated in real time, but which specific loop works is determined by the working mode and the minimum value calculation; S205, obtaining an actual measured value of the output voltage Voa and an output voltage setting value Voset, and calculating an output voltage error signal ΔVoout according to the actual measured value of the output voltage Ioa and the output voltage setting value Voset, the calculation formula being: ΔVoout=Voset-Voa; S206 , based on a loop negative feedback compensation algorithm, convert the output voltage error signal ΔVoout into an output voltage feedback signal Voc.

[0058] In this embodiment, obtaining the actual measured value of the output voltage Voa and the set value of the output voltage Voset is completed by the output voltage sampling circuit 41. The actual measured value of the output voltage Voa represents the actual output voltage currently provided by the system to the load, and the set value of the output voltage Voset is the ideal output voltage expected 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 will be converted into an output voltage feedback signal Voc, which is fed back to the drive parameter calculation 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 in the case of load changes or power fluctuations, thereby ensuring the safe operation of the entire system and efficient power conversion.

[0059] Among them, the compensator converts the error signal ΔIiout into an actual control signal Iic, that is, the input current control signal. This signal represents the adjustment amount of the input current, usually refers to the control signal used to drive the power conversion module, and is used to adjust the working state of the main power conversion module 1. Iic can be expressed as a reference value for adjusting the input current. This signal will be input into the drive parameter calculation processing module 5, and finally used to adjust the output power of the main power conversion module 1.

[0060] In summary, the input current error signal ΔIiout, the output current error signal ΔIoout and the output voltage error signal ΔVoout can be converted into the input current feedback signal Iic, the output current feedback signal Ioc and the output voltage feedback signal Voc through the compensation algorithm, so as to achieve accurate processing of each feedback signal, thereby ensuring the system's precise 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 working conditions.

[0061] Specifically, Figure 6As shown, the step of controlling the driving parameter calculation 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 driving signal includes: S401: If the driving parameter calculation processing module 5 is controlled to process the output voltage feedback signal and the input current feedback signal, a signal with the smallest amplitude is selected from the output voltage feedback signal and the input current feedback signal as a minimum value signal; In this embodiment, the purpose of controlling the drive parameter calculation processing module 5 to process the output voltage feedback signal and the input current feedback signal is to ensure that the system can prioritize the most critical signals when working through feedback control. During the operation of the power supply system, the output voltage feedback signal reflects the voltage output of the current 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 processing module 5 compares the amplitudes of the two feedback signals and selects the signal with the smallest amplitude as the minimum signal. In the minimum signal calculation link, when processing the output voltage feedback signal and the input current feedback signal, the signal with the smaller amplitude takes effect, that is, the parameter with priority control, and the other signal is the most restrictive protection; For example, in the core capacity mode, the input current is controlled, and the voltage negative feedback loop is normally open in this mode. However, once there is an abnormality (such as failure of the sampling circuit, etc.), the input current negative feedback loop is also open, and the output voltage is raised. Then the output voltage negative feedback loop will automatically take over (the voltage feedback signal is smaller than the current feedback signal), limiting the output voltage to operate at the set value.

[0062] S402: if the driving parameter calculation processing module 5 is controlled to process the output voltage feedback signal and the output current feedback signal, then a signal with the smallest amplitude is selected from the output voltage feedback signal and the output current feedback signal as a minimum value signal; In this embodiment, the control driving parameter calculation processing module 5 processes the output voltage feedback signal and the output current feedback signal, which is suitable for the normal working mode. When the system supplies power to the load, the feedback signals of the output voltage and the output current respectively reflect the actual conditions of the current voltage and current. The driving parameter calculation processing module 5 will select the signal with the smallest amplitude as the minimum signal among the two feedback signals to determine which parameter needs to be adjusted first. For example, when the load changes and causes the output voltage to fluctuate greatly, the driving parameter calculation processing module 5 will give priority to processing the output voltage feedback signal, so as to ensure the stability of the voltage output, avoid the influence of the voltage fluctuation on the load, and ensure the stable power supply of the system under different load conditions.

[0063] S403: Determine a corresponding driving signal according to the minimum value signal.

[0064] In this embodiment, determining the corresponding drive signal according to the minimum signal means that the system generates a corresponding control signal through the minimum signal, and this drive signal may be a pulse width modulation signal (PWM) and / or a pulse frequency modulation signal (PFM) for adjusting the working state of the main power conversion module 1. The drive signal achieves precise control of the power output by adjusting the working frequency or duty cycle of the main power conversion module 1, ensuring that the system can maintain stable current and voltage output under various working conditions. For example, in the case of large load current fluctuations, the system will generate a suitable PWM signal through the minimum signal, adjust the output current of the main power conversion module 1, ensure stable load power supply and improve the overall efficiency of the system.

[0065] In summary, the drive parameter calculation 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 signal, and generate the corresponding drive signal according to the minimum signal, thereby ensuring that the system performs precise power control according to the actual feedback signal in different working modes, ensuring the stable operation of the system, and improving the response speed and output efficiency of the system.

[0066] Specifically, in the step of determining a corresponding driving signal according to the minimum value signal, the driving signal at least includes a PWM signal and / or a PFM signal.

[0067] In this embodiment, the corresponding driving signal is determined according to the minimum signal, a PWM signal or a PFM signal is generated, and the working state of the main power conversion module 1 is adjusted to achieve precise adjustment of the system power output, thereby improving the power conversion efficiency and control accuracy of the system under different load conditions, and ensuring the efficient operation of the system under core capacity or normal working conditions. Specifically, Figure 7 As shown, the step of performing the capacity verification operation of the battery in the capacity verification process with constant current based on the determined preset capacity verification rule includes: S601: Determine the verification interval time t based on the preset verification rules. k ; In this embodiment, based on the determined preset capacity verification rules, determining the verification interval duration means that the system predefines the sampling time interval for each capacity verification process through 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 duration directly affects the accuracy of the capacity calculation. A time interval that is too long may cause the current fluctuation to be unable to be captured in time, while a time interval that is too short may increase the calculation complexity. Therefore, a reasonable verification interval duration can reduce the calculation burden of the system while ensuring data accuracy, and ensure that the current changes in the entire discharge process can be accurately captured.

[0068] S602: Real-time acquisition of the approved interval duration t k Discharge current value of internal battery Ii k ; In this embodiment, real-time acquisition of the discharge current value of the battery within the verification interval is achieved by inputting a current sampling circuit. During each verification interval, the system will continuously monitor and record the discharge current value of the battery. This process is to ensure that the current value in each time period is accurately recorded and provide a basis for subsequent capacity calculations. The stability of the discharge current is crucial in the capacity verification process, especially under constant current capacity verification conditions, ensuring accurate sampling of the current can avoid deviations in the capacity verification results caused by current fluctuations. For example, the system may collect and record the current value once a second so that the final capacity verification is more accurate.

[0069] S603, according to the determined interval time t k and the discharge current value Ii k , calculate the rated battery capacity C, the calculation formula is C = ∑Ii k ×t k .

[0070] In this embodiment, the approved battery capacity C is calculated based on the approved interval duration and the discharge current value by accumulating and calculating the collected current value. The capacity of the battery is usually calculated by the integration method, that is, in each sampling time period, the current value is multiplied by the time interval and then accumulated to obtain the total discharge capacity. The calculation formula is: C = Σ(I×Δt), where I is the current value in a certain time interval, and Δt is the approved interval duration. Through this step-by-step accumulation method, the system can accurately calculate the total capacity of the entire discharge process, thereby verifying whether the actual capacity of the battery reaches the expected value. Through precise current sampling and time recording, the system can avoid capacity verification deviation, thereby improving the accuracy of battery performance evaluation.

[0071] In summary, the capacity of the battery can be accurately calculated based on the preset capacity verification rules combined with the discharge current and time interval obtained in real time, ensuring that the current is constant during the battery capacity verification process, thereby improving the capacity verification accuracy, avoiding the problem of battery capacity being too large or too small due to capacity verification errors, and increasing the battery life and the overall reliability of the power system.

[0072] Furthermore, the battery capacity (AH) is verified by discharging the battery and calculating the final discharged capacity based on the product of the discharge current and the discharge time. The actual product is realized by multiplying a certain time interval by the current in the time interval (assuming that the current in the time interval is constant) and then summing them up, that is, C = ∑Ii k ×t k , where t k is the length of the above time interval, Ii k t k The current value during the time, C is the rated battery capacity.

[0073] In addition, the capacity of the battery is related to the discharge current. Generally, the larger the discharge current, the smaller the capacity that the battery can discharge. The battery capacity of domestic batteries is generally calibrated according to the 10-hour discharge rate, that is, C10. If the discharge current deviates from the discharge current of 0.1C10, even if the current Ii k The sampling accuracy and timing accuracy are very high, and the statistical capacity will still deviate from the C10 capacity. k High-precision time control can be easily achieved through clock chips or high-precision crystal oscillators. Therefore, the realization of core capacitance accuracy mainly depends on the high-precision and stable control of the core capacitance discharge current.

[0074] In order 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 supply system is determined by the working mode control module to be controlled by the input current negative feedback loop (working mode control module output Iic) or by the output current negative feedback loop (working mode control module output Ioc). That is, when the power supply system is operating in the battery core capacity discharge state, the output voltage of the power supply system is set to be higher than the voltage of the output bus. At this time, the output of the output voltage loop compensator will enter the positive saturation state (that is, reaching the output positive upper limit, that is, the voltage loop is open), and the input current negative feedback loop will work to achieve constant and stable discharge current; when the power supply system is operating in normal mode, the output current negative feedback loop will work, the power supply system outputs in normal mode, and current protection or current limiting output is achieved by the output current negative feedback loop control.

[0075] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by 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.

[0076] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A power supply system with dual current loop control, characterized in that: The dual current loop controlled power supply system comprises 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), an operating mode control module (6) and a drive parameter calculation processing module (5), wherein the power input end of the main power conversion module (1) is connected to a storage battery, the power output end of the main power conversion module (1) is connected to a load, the signal acquisition end of the input current negative feedback control module (2) acquires the actual input current signal between the power input end of the main power conversion module (1) and the storage battery through a current acquisition device, the feedback signal output end of the input current negative feedback control module (2) is connected to a first signal selection end of the operating mode control module (6), and the signal acquisition end of the output current negative feedback control module (3) acquires the actual input current signal between the power input end of the main power conversion module (1) and the storage battery 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 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 processing module (5), and the signal output terminal of the drive parameter calculation processing module (5) is connected to the drive signal input terminal of the main power conversion module (1).

2. A dual current loop controlled power supply system according to claim 1, characterized in that: The input current negative feedback control module (2) comprises an input current sampling circuit (21) and an input current loop compensator (22); the signal acquisition end of the input current sampling circuit (21) acquires the actual input current signal between the power input end of the main power conversion module (1) and the battery through a current acquisition device; after comparing the actual input current signal with an input current setting 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 end of the input current loop compensator (22) is connected to the first signal selection end of the working mode control module (6).

3. A dual current loop controlled power supply system according to claim 2, characterized in that: The output current negative feedback control module (3) comprises an output current sampling circuit (31) and an output current loop compensator (32); the signal acquisition end of the output current sampling circuit (31) acquires the actual output current signal between the power supply output end 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 setting 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 end of the output current loop compensator (32) is connected to the second signal selection end of the working mode control module (6).

4. A dual current loop controlled power supply system according to claim 1, characterized in that: The output voltage negative feedback control module (4) comprises an output voltage sampling circuit (41) and an output voltage loop compensator (42); the signal acquisition end of the output voltage sampling circuit (41) is connected to the power output end of the main power conversion module (1); after comparing the actual output voltage signal with the output voltage setting 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 end of the output voltage loop compensator (42) is connected to the second signal input end of the drive parameter calculation processing module (5).

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

6. A capacity control method for a power supply system based on dual current loop control, applied to a power supply system with dual current loop control as claimed in any one of claims 1 to 5, characterized in that: The core capacity method comprises the following steps: Control the battery to discharge; Obtaining an input current feedback signal, an output current feedback signal, and an output voltage feedback signal; Acquire working mode information of the power supply system, determine the output state of the working mode control module according to the working mode information, and send an input current feedback signal or an output current feedback signal to the driving parameter calculation processing module based on the output state; Controlling the driving parameter calculation 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, so as to generate a corresponding power driving signal; Based on the power driving signal, the main power conversion module is controlled to switch to a corresponding working state to ensure a constant current in the nuclear capacity process; Based on the determined preset capacity verification rules, the capacity verification operation of the battery is performed during the capacity verification process with constant current.

7. The method for determining the capacity of a power system based on dual current loop control according to claim 6, characterized in that: The step of obtaining the input current feedback signal, the output current feedback signal and the output voltage feedback signal comprises: Obtain an actual measured value of the input current Iia and an input current setting value Iiset, and calculate an input current error signal ΔIiout according to the actual measured value of the input current Iia and the input current setting value Iiset, the calculation formula is: ΔIiout=Iiset-Iia; Based on a loop negative feedback compensation algorithm, converting the input current error signal ΔIiout into an input current feedback signal Iic; Obtain an actual measured value of the output current Ioa and an output current setting value Ioset, and calculate an output current error signal ΔIoout according to the actual measured value of the output current Ioa and the output current setting value Ioset, the calculation formula is: ΔIoout=Ioset-Ioa; Based on a loop negative feedback compensation algorithm, converting the output current error signal ΔIoout into an output current feedback signal Ioc; Obtain an actual measured value of the output voltage Voa and an output voltage setting value Voset, and calculate an output voltage error signal ΔVoout according to the actual measured value of the output voltage Ioa and the output voltage setting value Voset, the calculation formula is: ΔVoout=Voset-Voa; Based on a loop negative feedback compensation algorithm, the output voltage error signal ΔVoout is converted into an output voltage feedback signal Voc.

8. The method for determining the capacity of a power supply system based on dual current loop control according to claim 6, characterized in that: The step of controlling the driving parameter calculation processing module to process the output voltage feedback signal and the input current feedback signal, or processing the output voltage feedback signal and the output current feedback signal to generate a corresponding power driving signal includes: If the driving parameter calculation and processing module is controlled to process the output voltage feedback signal and the input current feedback signal, the signal with the smallest amplitude is selected from the output voltage feedback signal and the input current feedback signal as the minimum signal; if the driving parameter calculation and processing module is controlled to process the output voltage feedback signal and the output current feedback signal, the signal with the smallest amplitude is selected from the output voltage feedback signal and the output current feedback signal as the minimum signal; and the corresponding driving signal is determined based on the minimum signal.

9. The method for determining the capacity of a power system based on dual current loop control according to claim 8, characterized in that: In the step of determining a corresponding driving signal according to the minimum value signal, the driving signal at least includes a PWM signal and / or a PFM signal.

10. The method for determining the capacity of a power system based on dual current loop control according to claim 6, characterized in that: The step of performing the capacity verification operation of the battery in the capacity verification process with constant current based on the determined preset capacity verification rule includes: Based on the preset capacity rules, determine the verification interval time t k ; Real-time acquisition of the approved interval duration t k Discharge current value of internal battery Ii k ; According to the approved interval time t k and the discharge current value Ii k , calculate the rated battery capacity C, the calculation formula is C = ∑Ii k ×t k .

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