A small power current sharing method for special-shaped structure power supply

Abstract

This invention relates to the field of power supply parallel current sharing control technology, and discloses a low-power current sharing method for irregularly shaped power supplies. The method includes: acquiring module configuration parameters and calculating the location of a dedicated disturbance time slot; collecting current data from the module to establish a time series; applying resistance disturbances in the dedicated time slot and recording the active response; recording the passive response in the non-dedicated time slot and extracting the coupling response coefficient; estimating the current of other modules based on the coupling response coefficient and calculating the deviation; adjusting the output impedance according to the current deviation; and cyclically executing the method to achieve dynamic current sharing. This method eliminates the need for a current sharing bus and data communication lines, solves the problems of module information isolation and impedance coupling in sealed irregularly shaped power supplies, and improves the balance of current distribution.

Description

Technical Field

[0001] This invention relates to the field of power supply parallel current sharing control technology, and more specifically, to a low-power current sharing method for power supplies with irregular structures. Background Technology

[0002] In the application field of low-power power modules, irregularly shaped power products, due to size constraints (such as circular or L-shaped structures), usually require multiple low-power modules to be connected in parallel to meet the load current requirements.

[0003] In the prior art, the current sharing control of parallel modules relies on a common current sharing bus. Each module is connected to the current sharing bus through a signal line. The load current sharing controller detects the output current of each module and compares it with the level of the current sharing bus. Then, it automatically adjusts the series impedance of the output terminal of each module to achieve balanced current distribution.

[0004] However, the following technical problems exist in irregularly shaped power supplies with sealing protection requirements: First, low-power modules are packaged in a sealed cavity, and due to the limitations of the packaging structure, signal lines cannot be led out to connect to the current sharing bus. The modules are in an information isolation state and cannot obtain the working status information of other modules. Second, in irregular structures, the modules are distributed in different areas, and the output current of each module must pass through a common trace to reach the load junction point. The current paths of each module have an impedance coupling relationship. Third, when a module adjusts its output impedance, the current change of that module will affect the current distribution of other modules through the common trace impedance, causing each module to be unable to accurately determine its own current distribution status, and the traditional current sharing control method based on the current sharing bus fails. Summary of the Invention

[0005] This invention provides a low-power current sharing method for power supplies with irregular structures, solving the technical problem in related technologies where effective current sharing control cannot be achieved between parallel modules in sealed power supplies with irregular structures due to the inability to set up a data communication bus.

[0006] This invention discloses a low-power current sharing method for power supplies with irregular structures, comprising the following steps: Obtain the total number of parallel modules and the module number of this module. Calculate the location of the disturbance time slot specific to this module based on the module number. One current sharing adjustment cycle contains time slots equal to the total number of modules. During the current sharing adjustment cycle, the current change time series of this module is continuously sampled and recorded by the built-in sensor; when the system clock enters the dedicated disturbance time slot of this module, a preset resistance increment is applied to the series adjustable resistor at the output of this module, and the current change of this module is recorded as active disturbance response data. At the end of the disturbance time slot, the adjustable resistor is restored to the resistance value before the disturbance. During non-dedicated disturbance time slots, monitor and record the passive response of the current of this module when other modules apply disturbances; The coupling response coefficient is determined based on the active disturbance response data and the passive response quantity. The current output current value of each other module is estimated based on the coupling response coefficient. The average current value of all modules is calculated, and the current deviation of this module is determined. Adjust the resistance value of the adjustable resistor connected in series at the output terminal of this module according to the current deviation of this module. When the current of this module is higher than the average current value, increase the resistance value; when the current of this module is lower than the average current value, decrease the resistance value. The current sharing adjustment cycle is executed cyclically to continuously optimize current distribution.

[0007] Furthermore, the disturbance time slot location dedicated to this module is the m-th time slot within the current sharing adjustment cycle, where m is the module number. All time slots have equal durations, and the m-th module performs active disturbance operation in the m-th time slot. The total number of parallel modules and the module number are pre-configured by non-volatile memory before the power system leaves the factory. The module numbers are unique and remain unchanged throughout the system's lifecycle.

[0008] Furthermore, the time slot duration is determined based on the RC time constant of the power supply system. The time slot duration is set to at least 3 times the RC time constant, so that the transient current response caused by resistance disturbance is attenuated to more than 95% of the steady-state value.

[0009] Furthermore, when recording the time series of current changes, a sliding window mean filtering algorithm is used to process multiple consecutive sampling points. The input is the original current sampling sequence, and the output is the filtered current sampling data.

[0010] Furthermore, the preset resistance increment satisfies the following constraints: the current change caused by the resistance increment is greater than the noise level of the current sampling, and the current change caused by the resistance increment is less than 10% of the rated current.

[0011] Furthermore, the method for determining the coupling response coefficient includes: the coupling response coefficient is defined as the ratio of the current response of the nth module to the current response of the nth module when the resistance disturbance is applied; the coupling response coefficient is obtained through calibration testing before the power system leaves the factory. The calibration method is to apply standard resistance disturbances to each module in sequence under standard load conditions, record the current response of all modules, calculate the coupling response coefficient, and store it in the non-volatile memory of each module.

[0012] Furthermore, when adjusting the resistance value of the series adjustable resistor at the output terminal of this module according to the current deviation of this module, a proportional-integral control algorithm is adopted. The resistance adjustment consists of a proportional term and an integral term. The proportional term is the product of the proportional coefficient and the current deviation, and the integral term is the product of the integral coefficient and the cumulative sum of the current deviation.

[0013] Furthermore, an upper limit and a lower limit are set for the adjustable resistor value. The upper limit is set to ensure that the current of this module is not less than 50% of the rated current under minimum load conditions, and the lower limit is set to ensure that the current of this module is not more than 150% of the rated current under maximum load conditions. When the calculated resistance value exceeds the upper limit, the upper limit is used; when the calculated resistance value is lower than the lower limit, the lower limit is used.

[0014] Furthermore, during the cyclic execution of current sharing adjustment cycles, each module periodically updates its coupling response coefficient. The update method is that after every preset number of current sharing adjustment cycles, each module recalculates the coupling response coefficient based on the active disturbance response data and passive response quantity of the most recent several cycles. Each module monitors the changing trend of its current deviation. When the current deviation of its module continues to increase within several consecutive current sharing adjustment cycles, a fault protection mechanism is triggered, adjusting the output impedance of its module to the maximum value and issuing a fault alarm signal.

[0015] This invention provides a low-power current sharing system for irregularly shaped power supplies, comprising: The time slot configuration module is used to obtain the total number of parallel modules and the module number, and calculate the location of the disturbance time slot specific to this module based on the module number; The current acquisition module is used to continuously sample and record the time series of current changes in this module through a built-in sensor during the current sharing adjustment cycle. The active disturbance module is used to apply a preset resistance increment to the series adjustable resistor at the output of this module when the system clock enters the dedicated disturbance time slot of this module, record the change in current of this module as active disturbance response data, and restore the adjustable resistor to the resistance value before the disturbance at the end of the disturbance time slot. The passive response monitoring module is used to monitor and record the passive response of the current of this module when other modules apply disturbances during non-dedicated disturbance time slots; The current deviation calculation module is used to determine the coupling response coefficient based on the active disturbance response data and the passive response quantity, estimate the current output current value of other modules based on the coupling response coefficient, calculate the average current value of all modules, and determine the current deviation of this module. The impedance adjustment module is used to adjust the resistance value of the adjustable resistor connected in series at the output terminal of this module according to the current deviation of this module; the cycle control module is used to cyclically execute the current sharing adjustment cycle and continuously optimize the current distribution.

[0016] This invention allocates dedicated disturbance time slots to each module, enabling each module to perceive the operating status of other modules through active disturbance and passive response under information isolation conditions. Based on the coupling response coefficient matrix, it estimates the current of other modules and calculates the current deviation of its own module, realizing distributed current sharing control without the need for a current sharing bus and data communication lines. This solves the current sharing control problem caused by information isolation and impedance coupling between modules in sealed irregular power supplies, and improves the current distribution balance and power supply reliability of irregular power supply systems. Attached Figure Description

[0017] Figure 1 This is a flowchart of a low-power current sharing method for irregularly shaped power supplies provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the time slot allocation for the current equalization adjustment cycle provided in an embodiment of the present invention; Figure 3 This is the active disturbance response current variation curve of module 2 provided in this embodiment of the invention; Figure 4 This is a comparison diagram of the current distribution of the four modules provided in an embodiment of the present invention; Figure 5 This is a heatmap of the coupling response coefficient matrix provided in an embodiment of the present invention; Figure 6 This is the current deviation convergence curve of module 2 in the continuous adjustment cycle provided in the embodiment of the present invention; Figure 7 This refers to the adjustable resistor adjustment process of module 2 provided in this embodiment of the invention; Figure 8 This is the current response of each module when the load changes suddenly, as provided in the embodiments of the present invention. Detailed Implementation

[0018] In applications of low-power power modules (such as 1 / 8 brick and 1 / 16 brick sizes), irregularly shaped power products, due to size constraints (such as ring-shaped or L-shaped structures), typically require multiple low-power modules to be connected in parallel to meet load current requirements. In existing technologies, current sharing control of parallel modules relies on a common current sharing bus. Each module is connected to the current sharing bus via signal lines. The load current sharing controller detects the output current of each module and compares it with the current sharing bus level, then automatically adjusts the series impedance at the output terminals of each module to achieve balanced current distribution.

[0019] However, the following technical problems exist in irregularly shaped power supplies with sealing protection requirements: First, low-power modules are packaged in a sealed cavity, and due to the limitations of the packaging structure, signal lines cannot be led out to connect to the current sharing bus. The modules are in an information isolation state and cannot obtain the working status information of other modules. Second, in irregular structures, the modules are distributed in different areas, and the output current of each module must pass through a common trace to reach the load junction point. The current paths of each module have an impedance coupling relationship. Third, when a module adjusts its output impedance, the current change of that module will affect the current distribution of other modules through the common trace impedance, causing each module to be unable to accurately determine its own current distribution status, and the traditional current sharing control method based on the current sharing bus fails.

[0020] This embodiment provides a low-power current sharing method for power supplies with irregular structures, applicable to power supplies containing... This is a non-standard power supply system with several parallel low-power modules. It should be understood that in this embodiment, each low-power module has an independent built-in microcontroller and adjustable resistor. The modules share a unified system clock signal but do not share data communication lines.

[0021] At least one embodiment of the present invention discloses a low-power current sharing method for power supplies with irregular structures, such as... Figure 1 As shown, it includes the following steps: Step 1: Obtain module configuration parameters and calculate the location of the perturbation time slot specific to this module; Get the total number of parallel modules pre-configured during the initialization of the irregular power supply. and this module number Based on the module number, calculate the location of the disturbance time slot specific to this module and generate time slot configuration parameters.

[0022] It should be noted that the disturbance time slot location specific to this module is the [number]th [time slot] within the current equalization adjustment cycle. Each time slot. A complete flow equalization cycle includes... There are 1 time slot, each with an equal duration. The module in the first Active disturbance operations are performed in each time slot. The duration of each time slot should meet the requirements for stable current response to ensure that the disturbance response can be completely recorded.

[0023] It should be noted that the total number of parallel modules and this module number The power system is pre-configured using non-volatile memory before leaving the factory; the module numbers are in... to Within the range and without repetition.

[0024] Furthermore, this module is numbered The range of values ​​is ,and The number is a positive integer, and the number of each module remains unchanged throughout the system's lifecycle, ensuring the uniqueness and stability of time slot allocation.

[0025] Furthermore, the method for determining the time slot duration is as follows: the time slot duration is set to be at least 3 times the RC time constant according to the RC time constant of the power system, to ensure that the transient current response caused by resistance disturbance can be attenuated to more than 95% of the steady-state value, so that each module can accurately collect steady-state response data.

[0026] A certain airborne equipment power distribution system uses an L-shaped irregular power supply. This power supply internally encapsulates four low-power modules connected in parallel to provide 28V DC power to the airborne radar system. Due to the stringent requirements for electromagnetic shielding and protection levels in the airborne environment, each module is sealed within an aluminum alloy cavity, preventing the routing of current-sharing bus signal lines. The irregular power supply is pre-configured at the factory; module 2 reads the configuration parameters from non-volatile memory: the total number of parallel modules. This module number Based on the configuration parameters, module 2 calculates that its dedicated disturbance time slot is the second time slot of the current equalization adjustment cycle.

[0027] The system measures the RC time constant of the power output circuit to be 15ms. Based on the requirement of 3 times the RC time constant, the duration of a single time slot is set to 45ms, and the duration of a complete current sharing regulation cycle is 180ms. Module 2 performs active disturbance operation during the time period from 45ms to 90ms in each regulation cycle.

[0028] Table 1 Module Configuration Parameter Information: Step 2: Collect current data for this module and establish a time series of current changes; Each low-power module acquires its own output voltage and output current values ​​through built-in sensors, continuously samples and records the current change time series during the entire time slot of the current sharing regulation cycle, and generates local current sampling data.

[0029] It should be noted that the current change time series is a sequence of current values ​​recorded at fixed sampling intervals. The sampling intervals should meet the requirements of the Nyquist sampling theorem for the frequency characteristics of the disturbance response. Each module independently maintains its local current sampling data and does not share it with other modules.

[0030] Furthermore, the built-in sensors include a current sampling resistor and an analog-to-digital converter. The current sampling resistor is connected in series in the module's output circuit. The output current value is obtained by measuring the voltage across the current sampling resistor. The analog-to-digital converter converts the voltage analog signal into a digital signal for processing by the microcontroller unit.

[0031] In this embodiment of the application, in order to improve the anti-interference capability of current sampling, when recording the time series of current changes, a sliding window mean filtering algorithm is used to process multiple consecutive sampling points. The input is the original current sampling sequence, and the output is the filtered current sampling data, which filters out high-frequency noise interference.

[0032] During a current sharing adjustment cycle at 14:23 on March 15, 20XX, the microcontroller unit of module 2 controlled the built-in sensor to continuously collect the output current at a sampling interval of 2ms. The current sampling resistor had a resistance of 5mΩ, and the analog-to-digital converter had a precision of 12 bits. At the beginning of this adjustment cycle, the radar system load power was 560W, and the output voltage of module 2 was stable at 28.2V. Module 2 collected a total of 90 current sampling points during the entire 180ms adjustment cycle, and processed the raw sampling data using a sliding average filter with a window length of 5.

[0033] Table 2 Current sampling data for module 2 (partial time points): Figure 3 The current change of module 2 before and after the resistance disturbance is applied in the second time slot is shown.

[0034] Step 3: Apply a resistance disturbance in the dedicated disturbance time slot and record the active disturbance response; When the system clock enters the dedicated disturbance time slot for this module, a preset resistance increment is applied to the series adjustable resistor at the output of this module. Record the change in current of this module before the end of the disturbance time slot. At the end of the disturbance time slot, the adjustable resistor is restored to its pre-disturbance resistance value to generate active disturbance response data.

[0035] It should be noted that the active disturbance response data is the change in the module's current after applying a resistance disturbance within the dedicated disturbance time slot. This change reflects the direct impact of the module's output impedance adjustment on its own current distribution.

[0036] It should be noted that the preset resistance increment The value of should meet two constraints: First, the change in current caused by the increase in resistance should be greater than the noise level of the current sampling to ensure that the disturbance response can be effectively identified; Second, the change in current caused by the increase in resistance should be less than 10% of the rated current to avoid the disturbance process affecting the stability of the load power supply.

[0037] Furthermore, the change in current of this module The calculation method is as follows: within the dedicated disturbance time slot, record the steady-state current value before the resistance disturbance is applied. and the steady-state current value after applying resistance disturbance Calculate the change in current. .

[0038] Furthermore, to ensure that the acquired current value is a steady-state value, after applying the resistance disturbance, a settling time of at least 3 times the RC time constant must be waited before acquiring the steady-state current value after the resistance disturbance is applied. .

[0039] When the system clock enters the second time slot (at 45ms), the microcontroller unit of module 2 controls the adjustable resistor to increase from the initial value of 120mΩ to 140mΩ, with the resistance increment... mΩ. Before applying the resistance disturbance, module 2 reads the filtered current value at the end of the first time slot from Table 2 as the steady-state current value before the disturbance. A. After applying a resistance disturbance, wait 45ms (3 times the RC time constant) for the current response to reach a steady state, and then collect the steady-state current value in the second time slot. A.

[0040] Module 2 calculates the current change in the active disturbance response: At the end of the second time slot (90ms), module 2 restores the adjustable resistor to 120mΩ, and the current gradually rises back to around 5.10A.

[0041] Table 3 Module 2 Active Disturbance Response Data: Step 4: Record the passive response in the non-dedicated perturbation time slot and extract the coupling response coefficients; During the current sharing adjustment cycle, except for the disturbance time slot specific to this module, monitor the current change of this module in other time slots and record the passive response of this module's current when disturbances are applied by other modules. (in This module calculates the row elements of the coupled response coefficient matrix based on the active disturbance response data and the passive response data.

[0042] It should be noted that the passive response quantity For the first When a module applies a resistance perturbation in its dedicated perturbation time slot, this module (the first module) The change in current of each module (passive response quantity) reflects the coupling effect of the output impedance adjustment of other modules on the current distribution of this module.

[0043] It should be noted that the coupling response coefficient matrix is... 3D matrix, matrix elements Defined as the first When a unit resistance disturbance is applied to the first module, the... The current response of the first module and the first The ratio of the current response of each module, i.e. diagonal elements .

[0044] Furthermore, the coupling response coefficient The calculation method is as follows: in the first... Each time slot records the current change of this module. and the Active perturbation response of each module Calculate the coupling response coefficients .

[0045] It should be noted that, since the modules do not share data communication lines, the first... The module cannot directly obtain the first... Active perturbation response of each module .

[0046] Therefore, the first Each module needs to base its passive response on its own observations. and pre-calibrated coupling response coefficient matrix elements Calculate the first Active perturbation response of each module .

[0047] Furthermore, the coupling response coefficient matrix is ​​obtained through calibration testing before the power system leaves the factory. The calibration method is as follows: under standard load conditions, standard resistance disturbances are applied to each module in sequence, the current response of all modules is recorded, each element of the coupling response coefficient matrix is ​​calculated, and the coupling response coefficient matrix is ​​stored in the non-volatile memory of each module.

[0048] During the first time slot (0ms to 45ms), module 1 applied a resistance disturbance. Module 2 detected that its own current changed from 5.08A at the beginning of the first time slot to 5.14A at the end of the first time slot. The passive response quantity... A. In the third time slot (90ms to 135ms), module 3 applies a resistance disturbance. Module 2 detects that its own current changes from 5.10A at the beginning of the third time slot to 5.13A at the end of the third time slot. Passive response quantity A. In the fourth time slot (135ms to 180ms), module 4 applies a resistance disturbance. Module 2 detects that its own current changes from 5.11A at the beginning of the fourth time slot to 5.16A at the end of the fourth time slot. Passive response quantity A.

[0049] Module 2 reads the second row of the factory-calibrated coupling response coefficient matrix from non-volatile memory: , , , Based on the passive response and coupling response coefficients, module 2 calculates the active disturbance response of other modules: Table 4. Passive Response Data Records (Module 2): Figure 2 The dedicated perturbation time slot allocation for the four modules within a 180ms adjustment period is shown.

[0050] Figure 4 This demonstrates the current distribution status of each module before and after current sharing control.

[0051] Figure 5 The coefficient matrix displays the current coupling relationships between modules.

[0052] Step 5: Estimate the current of other modules based on the coupling response coefficient, and calculate the current deviation of this module; Based on the elements of the current module's row in the coupling response coefficient matrix and the current changes observed in each time slot, estimate the current values ​​of other modules, calculate the average current value of all modules, and determine the deviation of the current of this module from the average current value.

[0053] It should be noted that the estimation method for the current output current value of the other modules is as follows: Assume the first The current value of each module before its dedicated perturbation time slot is The current value after applying a resistance perturbation in the dedicated perturbation time slot is After the disturbance time slot ends and the resistance is restored, the current value approximately returns to its original value. This module observes the passive response quantity. and coupling response coefficient Estimation Thus, the first The current value of each module.

[0054] It should be noted that the average current value of all modules The calculation method is as follows: ,in The total number of parallel modules, For the summation index and The range of values ​​is to positive integers, For the first Estimated current values ​​for each module (for this module) (Directly use the sampled current value).

[0055] It should be noted that the deviation of the current in this module from the average current value... The calculation method is as follows: ,in This is the current sampled current value for this module. This represents the average current value across all modules. A positive deviation indicates that the current of this module is higher than the average, requiring an increase in output impedance; a negative deviation indicates that the current of this module is lower than the average, requiring a decrease in output impedance.

[0056] Furthermore, to improve the accuracy of current estimation, when calculating the average current value of all modules, the estimated current value of multiple consecutive current sharing adjustment cycles is filtered using an exponentially weighted moving average algorithm to reduce the impact of transient disturbances on current estimation.

[0057] Module 2 estimates the current value of each module at the end of the adjustment period based on the passive and active disturbance responses of each time slot. Module 1's current before the disturbance in time slot 1 is 5.08A, its active disturbance response is -0.21A, and its estimated current upon recovery after the disturbance is... A. Module 3's current before the disturbance in time slot 3 is 5.10A, the active disturbance response is -0.20A, and the estimated current during recovery after the disturbance is... A. The current in module 4 before the disturbance in time slot 4 is 5.11A, the active disturbance response is -0.23A, and the estimated current during recovery after the disturbance is... A. The current sampled current of module 2 at the end of the adjustment cycle is A.

[0058] Calculate the average current value of all modules: Calculate the deviation of the current in module 2 from the average current value: Table 5 Current estimation and deviation calculation for each module: Step 6: Adjust the output impedance of this module according to the current deviation to achieve current sharing control; Based on the deviation of the module current from the average current value, the resistance value of the adjustable resistor connected in series at the output terminal of the module is adjusted according to the preset impedance adjustment strategy. When the module current is higher than the average current value, the resistance value of the adjustable resistor is increased; when the module current is lower than the average current value, the resistance value of the adjustable resistor is decreased, so that the module current approaches the average current value.

[0059] It should be noted that the preset impedance adjustment strategy uses a proportional-integral control algorithm, and the resistance adjustment amount... The calculation formula is: ,in This is the proportionality coefficient. The integral coefficient is... This represents the deviation of the module's current from the average current value. For time step indicators, For the first Current deviation at each time step This is the cumulative sum of current deviations.

[0060] It should be noted that the proportionality coefficient and integral coefficient The value of needs to be adjusted according to the dynamic characteristics of the power system to ensure that the current sharing control system has an appropriate response speed and stability margin, and to avoid oscillation.

[0061] Furthermore, to prevent the adjustable resistor value from exceeding a reasonable range, when adjusting the resistance value of the adjustable resistor connected in series at the output of this module, an upper limit and a lower limit value are set for the adjustable resistor value. When the calculated resistance value exceeds the upper limit value, the upper limit value is used; when the calculated resistance value is lower than the lower limit value, the lower limit value is used.

[0062] Furthermore, the upper and lower limits of the adjustable resistor value are determined as follows: the upper limit is set so that the current of this module is not less than 50% of the rated current under minimum load conditions, and the lower limit is set so that the current of this module does not exceed 150% of the rated current under maximum load conditions, ensuring that each module can participate in current sharing control within the full load range.

[0063] Module 2 reads the scaling factor from the configuration parameters. mΩ / A and integral coefficient mΩ / (A·cycle). The cumulative sum of current deviations maintained by module 2 is A (including the cumulative total of the previous 5 adjustment cycles). Current cycle current deviation. A, update the cumulative sum to A.

[0064] Calculate the resistance adjustment amount: Since the current deviation is positive, the adjustable resistor value needs to be increased. Module 2 adjusts the adjustable resistor from the current value of 120mΩ to... mΩ. The adjustable resistor has an upper limit of 180mΩ and a lower limit of 80mΩ, and the resistance value is within a reasonable range after adjustment.

[0065] Table 6 Impedance Adjustment Parameters for Module 2: Step 7: Repeatedly execute the current sharing adjustment cycle to continuously optimize current distribution; After completing the active disturbance, passive response recording, current deviation calculation and impedance adjustment of one current sharing adjustment cycle, the next current sharing adjustment cycle begins, and steps 2 to 6 are repeated. The current deviation of this module is continuously monitored and the output impedance is adjusted to achieve dynamic current sharing control.

[0066] It should be noted that the duration of the current sharing adjustment cycle should be determined based on the load change rate and system dynamic response requirements. For application scenarios with rapid load changes, the duration of the current sharing adjustment cycle should be shortened to improve the current sharing response speed; for application scenarios with slow load changes, the duration of the current sharing adjustment cycle can be appropriately extended to reduce the disturbance frequency.

[0067] Furthermore, during the cyclic execution of current sharing adjustment cycles, each module periodically updates the coupling response coefficient matrix. The update method is as follows: after every preset number of current sharing adjustment cycles, each module recalculates the elements of its own row in the coupling response coefficient matrix based on the active disturbance response data and passive response data of the most recent several cycles, in order to adapt to impedance characteristic drift caused by factors such as power system aging and temperature changes.

[0068] Furthermore, in order to improve the robustness of current sharing control, during the cyclic execution of current sharing adjustment cycle, each module monitors the changing trend of its current deviation. When the current deviation of the module continues to increase in multiple consecutive current sharing adjustment cycles, it is determined that there may be a module fault or load abnormality, triggering the fault protection mechanism, adjusting the output impedance of the module to the maximum value and issuing a fault alarm signal.

[0069] After completing the first adjustment cycle, Module 2 entered the second adjustment cycle to continue executing current sharing control. During the five minutes from 14:23 to 14:28 on March 15, 20XX, Module 2 cyclically executed 1667 adjustment cycles. In the first adjustment cycle, the current deviation of Module 2 was 0.002A, and the adjustable resistor was adjusted to 120.079mΩ. In the second adjustment cycle, Module 2 repeated steps 2 to 6, and the current deviation decreased to 0.0008A, with the adjustable resistor adjusted to 120.092mΩ. In the tenth adjustment cycle, the current deviation of Module 2 decreased to 0.0002A, and the current of each module basically reached a balanced state.

[0070] Module 2 is configured to update the coupling response coefficients every 100 adjustment cycles. At the end of the 100th adjustment cycle, Module 2 recalculates the coupling response coefficients based on the disturbance response data of the most recent 100 cycles.

[0071] Original calibration value Updated calculated value The deviation is 1.4%, which is within the allowable range. Update the coupling response coefficient matrix.

[0072] During the 523rd adjustment cycle, the radar system load suddenly increased to 840W, and the current of module 2 jumped from 5.10A to 7.62A. Module 2 detected an increase in current deviation to 0.18A, and through impedance adjustment over eight consecutive adjustment cycles, reduced the current deviation to 0.006A, allowing all modules to return to a current-sharing state.

[0073] Table 7 shows the current deviation changes of module 2 during the continuous adjustment cycle: Table 8. Coupling response coefficient update record: Figure 6 The demonstration module 2 shows the process of the current deviation gradually converging to zero during the continuous adjustment cycle.

[0074] Figure 7 The variable resistor in module 2 changes with the current deviation.

[0075] Figure 8 The display shows the dynamic response of the current of each module when the load suddenly increases from 560W to 840W.

[0076] The low-power current sharing method for irregularly shaped power supplies provided in this embodiment allocates a dedicated disturbance time slot to each module, enabling each module to perceive the working status of other modules through active disturbance and passive response under information isolation conditions. Based on the coupling response coefficient matrix, it estimates the current of other modules and calculates the current deviation of its own module, realizing distributed current sharing control without the need for a current sharing bus and data communication lines. This solves the current sharing control problem caused by information isolation and impedance coupling between modules in sealed irregularly shaped power supplies, and improves the current distribution balance and power supply reliability of irregularly shaped power supply systems.

[0077] The embodiments of the present invention have been described above. However, the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make more equivalent embodiments under the guidance of the present embodiments, and all of them are within the protection scope of the present embodiments.

Claims

1. A low-power current sharing method for irregularly shaped power supplies, applied to an irregularly shaped power supply system containing N parallel low-power modules, wherein each module shares a unified system clock signal but does not share data communication lines, characterized in that... Includes the following steps: Obtain the total number of parallel modules and the module number of this module. Calculate the location of the disturbance time slot specific to this module based on the module number. One current sharing adjustment cycle contains time slots equal to the total number of modules. During the current sharing adjustment cycle, the current change time series of this module is continuously sampled and recorded by the built-in sensor; when the system clock enters the dedicated disturbance time slot of this module, a preset resistance increment is applied to the series adjustable resistor at the output of this module, and the current change of this module is recorded as active disturbance response data. At the end of the disturbance time slot, the adjustable resistor is restored to the resistance value before the disturbance. During non-dedicated disturbance time slots, monitor and record the passive response of the current of this module when other modules apply disturbances; The coupling response coefficient is determined based on the active disturbance response data and the passive response quantity. The current output current value of each other module is estimated based on the coupling response coefficient. The average current value of all modules is calculated, and the current deviation of this module is determined. Adjust the resistance value of the adjustable resistor connected in series at the output terminal of this module according to the current deviation of this module. When the current of this module is higher than the average current value, increase the resistance value; when the current of this module is lower than the average current value, decrease the resistance value. The current sharing adjustment cycle is executed cyclically to continuously optimize current distribution.

2. The low-power current sharing method for irregularly shaped power supplies according to claim 1, characterized in that, The disturbance time slot for this module is the m-th time slot within the current sharing adjustment cycle, where m is the module number. All time slots have the same duration, and the m-th module performs the active disturbance operation in the m-th time slot. The total number of parallel modules and the module number are pre-configured in non-volatile memory before the power system leaves the factory. The module numbers are unique and remain unchanged throughout the system's lifecycle.

3. The low-power current sharing method for irregularly shaped power supplies according to claim 2, characterized in that, The time slot duration is determined based on the RC time constant of the power supply system. The time slot duration is set to at least 3 times the RC time constant so that the transient current response caused by resistance disturbance is attenuated to more than 95% of the steady-state value.

4. The low-power current sharing method for irregularly shaped power supplies according to claim 1, characterized in that, When recording the time series of current changes, a sliding window mean filtering algorithm is used to process multiple consecutive sampling points. The input is the original current sampling sequence, and the output is the filtered current sampling data.

5. The low-power current sharing method for irregularly shaped power supplies according to claim 1, characterized in that, The preset resistance increment must meet the following constraints: the change in current caused by the resistance increment is greater than the noise level of the current sampling, and the change in current caused by the resistance increment is less than 10% of the rated current.

6. The low-power current sharing method for irregularly shaped power supplies according to claim 1, characterized in that, The method for determining the coupling response coefficient includes: the coupling response coefficient is defined as the ratio of the current response of the nth module to the current response of the nth module when the resistance disturbance is applied; the coupling response coefficient is obtained through calibration test before the power system leaves the factory. The calibration method is to apply standard resistance disturbance to each module in sequence under standard load conditions, record the current response of all modules, calculate the coupling response coefficient and store it in the non-volatile memory of each module.

7. The low-power current sharing method for irregularly shaped power supplies according to claim 1, characterized in that, When adjusting the resistance value of the adjustable resistor connected in series at the output terminal of this module based on the current deviation of this module, a proportional-integral control algorithm is adopted. The resistance adjustment consists of a proportional term and an integral term. The proportional term is the product of the proportional coefficient and the current deviation, and the integral term is the product of the integral coefficient and the cumulative sum of the current deviation.

8. The low-power current sharing method for irregularly shaped power supplies according to claim 7, characterized in that, Set upper and lower limits for the adjustable resistor value. The upper limit is set so that the current of this module is not less than 50% of the rated current under minimum load conditions, and the lower limit is set so that the current of this module is not more than 150% of the rated current under maximum load conditions. When the calculated resistance value exceeds the upper limit, the upper limit is used, and when the calculated resistance value is lower than the lower limit, the lower limit is used.

9. The low-power current sharing method for irregularly shaped power supplies according to claim 1, characterized in that, During the cyclic execution of current sharing adjustment, each module periodically updates its coupling response coefficient. The update method is that after every preset number of current sharing adjustment cycles, each module recalculates the coupling response coefficient based on the active disturbance response data and passive response quantity of the most recent several cycles. Each module monitors the changing trend of its current deviation. When the current deviation of its module continues to increase within several consecutive current sharing adjustment cycles, the fault protection mechanism is triggered, the output impedance of its module is adjusted to the maximum value, and a fault alarm signal is issued.

10. A low-power current sharing system for irregularly shaped power supplies, used to execute the low-power current sharing method for irregularly shaped power supplies according to any one of claims 1 to 9, characterized in that, include: The time slot configuration module is used to obtain the total number of parallel modules and the module number, and calculate the location of the disturbance time slot specific to this module based on the module number; The current acquisition module is used to continuously sample and record the time series of current changes in this module through a built-in sensor during the current sharing adjustment cycle. The active disturbance module is used to apply a preset resistance increment to the series adjustable resistor at the output of this module when the system clock enters the dedicated disturbance time slot of this module, record the change in current of this module as active disturbance response data, and restore the adjustable resistor to the resistance value before the disturbance at the end of the disturbance time slot. The passive response monitoring module is used to monitor and record the passive response of the current of this module when other modules apply disturbances during non-dedicated disturbance time slots; The current deviation calculation module is used to determine the coupling response coefficient based on the active disturbance response data and the passive response quantity, estimate the current output current value of other modules based on the coupling response coefficient, calculate the average current value of all modules, and determine the current deviation of this module. Impedance adjustment module, used to adjust the resistance value of the adjustable resistor connected in series at the output terminal of this module according to the current deviation of this module; The cycle control module is used to cyclically execute the current sharing adjustment cycle and continuously optimize the current distribution.

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