Current sharing system, electronic equipment and current sharing method

Abstract

The invention discloses a current sharing system, electronic equipment and a current sharing method, and relates to the technical field of power supplies, an independent analog-to-digital conversion unit is adopted to carry out shunt sampling and quantification on electrical parameters on a connection line between a power supply module and a load interface, the parallelism of signal acquisition and the system response speed are improved, and the system reliability is improved. The control module judges whether the impedance of each line is balanced or not based on the parameters, if the impedance is unbalanced, a control signal is sent to the variable impedance module on the line with the abnormal impedance, the impedance is dynamically adjusted, and finally the impedance of all the parallel branches tends to be consistent, so that automatic balanced distribution of current is realized, and the service life is prolonged. The technical problems of non-uniform current distribution, easy overheating aging and system stability reduction of the parallel power supply module caused by line impedance difference are solved, and the beneficial effects of improving the overall efficiency of the system, prolonging the service life of the module and enhancing the operation stability are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a current sharing system, an electronic device and a current sharing method. BACKGROUND

[0002] With the increasing power demand of electronic devices, multi-power brick parallel system is increasingly widely used in data centers, industrial control and other fields. This architecture can increase the total power of the system and provide redundancy backup and convenient power expansion capability. However, in actual application, due to the difference in line impedance of each parallel branch, the current is not evenly distributed among each power brick. The power brick that bears too much current is easy to overheat, thereby accelerating aging, shortening life, and also reducing the overall efficiency and operation stability of the system, which restricts its application in high-end industrial scenarios.

[0003] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present. SUMMARY

[0004] The present application provides a current sharing system, an electronic device and a current sharing method to at least solve the technical problems of uneven distribution of parallel power supply module current, easy overheating and aging, and system stability decline caused by line impedance difference.

[0005] The present application provides a current sharing system applied to an electronic device, the electronic device comprising a load interface and a plurality of parallel power supply modules, a connection line being provided between the load interface and each power supply module, the current sharing system comprising: a detection module comprising a sampling resistor provided on the connection line, a first sampling point provided on the connection line and close to the output end of the power supply module, and a second sampling point provided on the connection line and close to the load interface, further comprising a first analog-to-digital conversion unit and a second analog-to-digital conversion unit, the first analog-to-digital conversion unit being configured to collect the voltage across the sampling resistor, and the second analog-to-digital conversion unit being configured to collect the voltage of the first sampling point and the voltage of the second sampling point respectively; a variable impedance module provided on the connection line and configured to adjust the impedance on the connection line in response to the received control signal; and a control module connected with the detection module and the variable impedance module, configured to obtain the impedance of each connection line based on the voltage collected by the first analog-to-digital conversion unit and the voltage collected by the second analog-to-digital conversion unit, determine a target connection line when it is determined that the impedance of each connection line does not satisfy the balance condition, and send the control signal to the variable impedance module on the target connection line to make the impedance of each connection line equal.

[0006] The present application also provides an electronic device comprising a load interface, a plurality of parallel power supply modules and a current sharing system as described above.

[0007] The application also provides a current sharing method, which applies the control module in the current sharing system as described above, and the current sharing method comprises the following steps: obtaining the impedance of the connection line between the load interface and each power supply module in the electronic device based on the voltage collected by the first analog-digital conversion unit and the voltage collected by the second analog-digital conversion unit; the voltage collected by the first analog-digital conversion unit comprises the voltage across the sampling resistor arranged on the connection line, and the voltage collected by the second analog-digital conversion unit comprises the voltage of the first sampling point arranged on the connection line and close to the output end of the power supply module and the voltage of the second sampling point arranged on the connection line and close to the load interface; determining the target connection line when it is determined that the impedance of each connection line does not satisfy the balance condition; and controlling the variable impedance module on the target connection line to adjust the impedance on the connection line, so that the impedance of each connection line is equal.

[0008] By the application, the electrical parameters on the connection line between the power supply module and the load interface are sampled and quantified by independent analog-digital conversion units, which improves the parallelism of signal collection and the system response speed. The control module determines whether the impedance of each line is balanced based on these parameters, and if it is found that the impedance is not balanced, a control signal is sent to the variable impedance module on the abnormal impedance line to dynamically adjust the impedance, so that the impedance of all parallel branches tends to be consistent, thereby realizing automatic balanced distribution of current, solving the technical problems of uneven distribution of current among parallel power supply modules, easy overheating and aging and decline of system stability caused by differences in line impedance, and achieving the beneficial effects of improving the overall efficiency of the system, prolonging the service life of the module and enhancing the operation stability. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0010] Figure 1 A structural schematic diagram of a current sharing system provided by an embodiment of the application.

[0011] Figure 2 A structural schematic diagram of another current sharing system provided by an embodiment of the application.

[0012] Figure 3 A structural schematic diagram of a digital potentiometer provided by an embodiment of the application.

[0013] Figure 4 A step flowchart of a current sharing method provided by an embodiment of the application. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, any other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0015] It should be noted that, in the description of the present application, the terms “comprise”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. The terms “first”, “second” and the like in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence.

[0016] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0017] Please refer to Figure 1 The embodiments of the present application provide a current sharing system applied to an electronic device, the electronic device comprising a plurality of power supply modules connected in parallel, and the current sharing system comprising: a detection module 1 configured to detect an electrical parameter on a connection line between a load and each power supply module; a variable impedance module 2 arranged on each connection line and configured to adjust the impedance on the connection line in response to a received control signal; and a control module 3 connected with the detection module 1 and the variable impedance module 2, and configured to determine the impedance of each connection line based on the electrical parameter, determine a target connection line when determining that the impedance of each connection line does not satisfy a balance condition, and send a control signal to the variable impedance module 2 on the target connection line to make the impedance of each connection line equal.

[0018] In the embodiments, the power supply module can be a power brick or an electronic fuse (efuse) connected with a power supply, that is, the current sharing system in the embodiments can be applied to a multi-power brick parallel connection scenario, or a multi-efuse parallel connection scenario, of course, it is not limited to the above two parallel connection scenarios, and can also be applied to other scenarios. Taking the power brick parallel connection scenario as an example, a connection line is arranged between each power brick and a load interface.

[0019] The detection module 1 is configured to acquire electrical parameters (e.g. voltage values at different sampling points on the connection lines) on the connection lines, and is connected to the control module 3 to transmit the acquired electrical parameters to the control module 3. As an optional embodiment, the detection module 1 can be composed of sampling resistors and signal conditioning circuits, and the sampling resistors can be coupled to the connection lines one by one.

[0020] The variable impedance module 2 is arranged on each connection line, and has a first end connected to the power supply module, a second end connected to the load interface, and a controlled end connected to the control module 3. The variable impedance module 2 adjusts its impedance value in response to the control signal output by the control module 3, so as to adjust the impedance on the connection line where the variable impedance module 2 is located.

[0021] The control module 3 can specifically include a microcontroller or a digital signal processor. The control module 3 has a plurality of detection ends connected to a plurality of output ends of the detection module 1 one by one to acquire the electrical parameters detected by the detection module 1. The control module 3 has a control end connected to the controlled end of the variable impedance module 2. The control module 3 calculates the impedance of each connection line according to the electrical parameters of the connection lines by using an internal algorithm, and determines whether the connection lines are balanced. When it is determined that the connection lines are not balanced, the control module 3 determines a target connection line, and sends a control signal to the variable impedance module 2 on the target connection line to make the variable impedance module 2 adjust the impedance on the connection line where the variable impedance module 2 is located, so that the impedances of the connection lines are equalized.

[0022] It can be understood that, in the embodiment, the detection module 1 continuously monitors the electrical parameters on the connection lines, and the control module 3 compares the real-time data with preset balanced conditions. Once the current imbalance caused by the impedance difference of the connection lines is identified, the target connection line to be adjusted and the impedance change amount required by the target connection line are calculated, and then the variable impedance module 2 on the target connection line is driven to adjust its impedance value for compensation, so as to actively offset the inherent impedance difference of the connection lines, realize the current equalization of the power supply modules, and dynamically respond to the impedance drift caused by the load change and the aging of components, so as to ensure the real-time and persistence of the current equalization effect.

[0023] On the basis of the above embodiment, please refer to Figure 2On the basis of the current equalization system provided in the above embodiment, the detection module 1 comprises: a sampling resistor R arranged on each connection line; a first sampling point arranged on the connection line and close to the output end of the power supply module; a second sampling point arranged on the connection line and close to the load interface; a first analog-digital conversion unit 11 configured to collect the voltage across the sampling resistor R; a second analog-digital conversion unit 12 configured to collect the voltage of the first sampling point and the voltage of the second sampling point respectively; and the control module 3 is specifically configured to obtain the impedance of each connection line based on the voltage collected by the first analog-digital conversion unit 11 and the voltage collected by the second analog-digital conversion unit 12, and determine the target connection line when it is determined that the impedance of each connection line does not satisfy the equalization condition, and send a control signal to the variable impedance module on the target connection line to make the impedance of each connection line equal.

[0024] In this embodiment, the sampling resistor R is connected in series in each connection line. This embodiment takes one connection line as an example for description, and the same applies to other connection lines.

[0025] The first sampling point is arranged between the sampling resistor R and the output end of the power supply module and close to the output end of the power supply module, for monitoring the actual output voltage V_out of the power supply module, and the second sampling point is arranged between the sampling resistor R and the load interface and close to the load interface, for monitoring the input voltage V_in on the load side. Correspondingly, the third sampling point and the fourth sampling point can also be arranged across the sampling resistor R, and the control module 3 performs accurate impedance calculation by measuring the current flowing through the sampling resistor R (I, which can be calculated by measuring the voltage difference across the sampling resistor R and dividing the resistance value of the known sampling resistor R . ), and combining the voltage of the first sampling point and the voltage of the second sampling point.

[0026] In this embodiment, the first analog-digital conversion unit 11 and the second analog-digital conversion unit 12 are both ADC conversion units, and the first analog-digital conversion unit 11 is used to collect the voltage signal across the sampling resistor R with high precision. The second analog-digital conversion unit 12 is used to synchronously or nearly synchronously collect the ground voltage signals of the first sampling point and the second sampling point. This clear division of labor facilitates the optimization of the configuration of the ADC, for example, a high-resolution, high-precision differential input ADC can be selected as the first analog-digital conversion unit 11, and a multi-channel single-ended input ADC can be selected as the second analog-digital conversion unit 12 for measuring the voltages of the first sampling point and the second sampling point.

[0027] The control module 3 receives digital quantities from the two ADCs. First, according to the digital quantity (corresponding ) sent by the first analog-digital conversion unit 11 and the known resistance value of the sampling resistor R ( ​), by formula The current value flowing through the connection line is accurately calculated. Secondly, the control module 3 reads two digital quantities (corresponding to V_out and V_in respectively) sent by the second analog-digital conversion unit 12, and obtains the total voltage drop of the connection line through digital operation Finally, the impedance is calculated by using the following relationship Z_line is the impedance of the connection line.

[0028] The embodiment adopts independent analog-digital conversion units for branch sampling and quantization, avoids the range matching problem and calculation error caused by asynchronous sampling time when a single ADC is used to collect different signals (small signal differential voltage and large signal voltage to ground), allows selecting the most suitable ADC device for different types of signals, optimizes the system cost and performance, improves the parallelism of signal acquisition and system response speed, and thus improves the control accuracy and reliability of the entire current sharing system.

[0029] As an optional embodiment, the control module 3 is specifically configured to calculate the total voltage drop of the connection line based on the voltage of the first sampling point and the voltage of the second sampling point on the connection line, take the ratio of the total voltage drop on the connection line and the current flowing through the sampling resistor R as the impedance of the connection line, and determine the target connection line when it is determined that the impedance of each connection line does not satisfy the balance condition, and send a control signal to the variable impedance module 2 on the target connection line to make the impedance of each connection line equal.

[0030] Specifically, the control module 3 obtains the total voltage drop of the connection line by calculating the difference between the voltage (V_out) of the first sampling point and the voltage (V_in) of the second sampling point, and determines the impedance (Z_line) of the connection line in combination with the calculated current value (I). The specific calculation formula is: This calculated impedance Z_line includes the impedance of the entire path from the output end of the power supply module to the load interface, mainly including the line parasitic resistance, contact resistance and the current impedance value of the variable impedance module 2. Through this calculation method, the impedance in the actual circuit can be comprehensively reflected.

[0031] The control module 3 compares the impedance of each connection line, and after determining the target connection line when it is determined that the impedance of each connection line does not satisfy the balance condition, the control module 3 sends a control signal to the variable impedance module 2 on the target connection line to finely adjust the impedance, for example, for the line with high impedance, the resistance value of the variable impedance module 2 is reduced, and for the line with low impedance, the resistance value of the variable impedance module 2 is increased, until the impedance of all connection lines reaches dynamic balance again.

[0032] The embodiment can accurately and directly measure the actual total impedance on each connection line by using two-point sampling and combining current measurement, thereby improving the directness of measurement. The embodiment can help eliminate system errors caused by different sampling point positions or reference ground potential differences, thereby significantly improving the accuracy and reliability of impedance measurement and current sharing control. Thus, the embodiment can effectively compensate for inherent impedance differences caused by different PCB (Printed Circuit Board) trace lengths, widths, connector contact resistances, and the like, and achieve active impedance matching, thereby ensuring that each power supply module in parallel achieves excellent current sharing performance, effectively preventing individual power supply modules from being overloaded, and improving the overall efficiency and reliability of the system.

[0033] In an example embodiment, the control module 3 is further configured to calculate the difference between the currents of any two connection lines, and determine that the impedances of the connection lines do not satisfy the balance condition when the absolute value of any difference is greater than a preset threshold value.

[0034] In the embodiment, after the control module 3 obtains the current values of the connection lines through the detection module 1, the control module 3 will cyclically compare or selectively compare the current values of any two connection lines, calculate the difference , , between the current values, compare the difference with a preset threshold value, which can be a maximum allowed current deviation value preset based on system safety margin, component tolerance, and current sharing accuracy requirements and the like. Once it is found that the absolute value of any current difference exceeds the preset threshold value, it indicates that the current distribution on at least one connection line is uneven, thereby reflecting that the impedances of the connection lines are in an unbalanced state, triggering the subsequent impedance adjustment procedure.

[0035] The embodiment based on the direct comparison scheme of the current difference has simpler calculation logic and faster response speed, and is suitable for scenarios that require quick response to dynamic load changes. Directly analyzing the uneven current helps the control module 3 quickly identify the power supply line with the largest current deviation, thereby providing a clear basis for accurately determining the target connection line that needs to be adjusted first.

[0036] In an example embodiment, the control module 3 is specifically configured to obtain the impedances of the connection lines based on the voltage collected by the first analog-to-digital conversion unit 11 and the voltage collected by the second analog-to-digital conversion unit 12, and when it is determined that the impedances of the connection lines do not satisfy the balance condition, determine at least one of the two connection lines with the absolute value of the difference greater than the preset threshold value as the target connection line, and send a control signal to the variable impedance module 2 on the target connection line, so that the impedances of the connection lines are equal.

[0037] In this embodiment, when the control module 3 finds that the absolute value of the current difference between two connection lines (for example, connection line A and connection line B) exceeds the preset threshold value through current comparison, it determines the target connection line from the two lines.

[0038] As an optional embodiment, the connection line with a larger current value (for example, connection line A) can be determined as the target connection line, and the resistance value of the variable impedance module 2 thereof is increased to reduce the current of the line, or the connection line with a smaller current value (for example, connection line B) can be determined as the target connection line, and the resistance value of the variable impedance module 2 thereof is reduced to increase the current of the line. The selection of which line to adjust can be set according to the system optimization goal (for example, priority is given to the service life or overall efficiency of the key power supply module). As an optional embodiment, the impedance of connection line A and connection line B can also be adjusted at the same time, for example, the impedance of the low-impedance connection line is increased and the impedance of the high-impedance connection line is reduced, so as to improve the response speed.

[0039] In view of the complex situation that multiple current differences may exceed the preset threshold value at the same time in actual operation. In order to efficiently and stably restore the system balance, the control module 3 can determine the target connection line according to the priority strategy.

[0040] Specifically, the control module 3 can calculate the size of all over-standard differences, and preferentially process the pair of connection lines with the largest absolute value of current deviation. For example, if , , and all exceed the threshold value, the connection line 1 and the connection line 3 with a current deviation of 8A are preferentially processed. First, the most serious imbalance is corrected, the system risk is quickly reduced, and individual branch overload is avoided.

[0041] The control module 3 can also first calculate the average value (I_avg) of the currents of all connection lines. Then, all current values are compared with the average value, and the connection line (i.e. the connection line with the largest absolute value) deviating farthest from the average value is determined as the primary target connection line for adjustment, so as to make the branch currents converge to the center value, which helps the system as a whole to quickly reach the balanced state.

[0042] The control module 3 can also use a step-by-step iteration strategy, that is, whether the priority strategy or the benchmark strategy is used, only one target connection line is usually adjusted in one control cycle. After adjustment, the next sampling and control cycle is entered, and re-determination and calculation are performed. This iterative adjustment method can avoid system oscillation or over-compensation problems that may be caused by simultaneously adjusting multiple variable impedance modules 2, and ensures the stability and reliability of the control process.

[0043] As another alternative, when the control module 3 finds that there are multiple difference values exceeding the preset threshold, it analyzes all the out-of-tolerance data, identifies the key connection line that causes the most imbalance and prioritizes adjustment.

[0044] Specifically, as in a three-way power supply system, the measured currents The preset threshold is 1. The difference values are calculated as follows: (exceeding the preset threshold), (not exceeding the preset threshold), (exceeding the preset threshold). In this scenario, although and have the largest deviation, the connection line where is located simultaneously exceeds the preset threshold in comparison with and , indicating that the connection line where is located is the core node of the current system imbalance. In contrast, only exceeds the preset threshold in comparison with , while the difference with is within the allowable range. Therefore, the decision logic of the control module 3 will prioritize the connection line where is located as the target connection line for adjustment. By adjusting the variable impedance module 2 on the connection line where is located, so that its current value is closer to the middle value of and , it can simultaneously improve the two out-of-tolerance imbalance relationships of and , thereby achieving the goal of restoring overall system balance with the least adjustment action and highest efficiency, optimizing control efficiency and stability.

[0045] In an exemplary embodiment, the control module 3 is further configured to generate an alarm instruction and / or a power cutoff instruction when it determines that there is an abnormal connection line with a current greater than a safety current threshold. The current-sharing system further includes an alarm module configured to prompt alarm information corresponding to the abnormal connection line when it receives the alarm instruction.

[0046] In this embodiment, the safety current threshold can be a critical value preset based on the maximum safe current-carrying capacity of the power supply module, the connection line and the components, which is usually higher than the allowable current deviation threshold during normal current-sharing adjustment. While continuously monitoring the currents of each connection line, the control module 3 will compare them with the safety current threshold in real time. Once it detects that the current of a connection line continuously or instantaneously exceeds this safety threshold, the control module 3 determines that the line is an abnormal connection line, which may have a short circuit, a serious overload or a current-sharing system failure.

[0047] The control module 3 generates an alarm instruction and sends it to the alarm module to timely inform the operation and maintenance personnel that the system has an abnormality, so as to intervene and check to prevent the fault from expanding. The control module 3 can also send a power-off instruction to the power supply module on the abnormal connection line or the power supply control unit (such as an electronic fuse efuse) in front of it directly or through an additional drive circuit, to realize rapid power-off isolation of the branch. This effectively protects the power supply module and the line safety, and prevents equipment damage or causes more serious systemic problems.

[0048] In this embodiment, the alarm and power-off measures can be started independently or simultaneously, and the specific strategy can be configured according to the severity of the fault (such as the over-limit amplitude and duration).

[0049] After receiving the alarm instruction, the alarm module can prompt the alarm information in various forms such as sound, light, and electricity. Specifically, it can include triggering a buzzer to emit an alarm sound, lighting an indicator light of a specific color (such as red) or flashing an LED (Light-Emitting Diode), popping up a prompt box on the system HMI (Human-Machine Interface) or monitoring software and explicitly indicating the number of the abnormal connection line, etc., so as to provide clear and intuitive fault positioning information for the operation and maintenance personnel.

[0050] In an exemplary embodiment, the acquisition period of the first and second analog-to-digital conversion units 11 and 12 is less than or equal to the calculation period of the control module 3; the control module 3 is specifically configured to, in each calculation period, for each connection line, obtain the average value of the voltage collected by the first analog-to-digital conversion unit 11 in the continuous multiple acquisition periods closest to the current time, to calculate the current flowing through the sampling resistor R on the connection line, obtain the average value of the voltage collected by the second analog-to-digital conversion unit 12 in the continuous multiple acquisition periods closest to the current time, to calculate the total voltage drop of the connection line, and take the ratio of the total voltage drop on the connection line and the current flowing through the sampling resistor R as the impedance of the connection line; when it is determined that the impedances of the connection lines do not satisfy the equalization condition, the target connection line is determined, and a control signal is sent to the variable impedance module 2 on the target connection line to make the impedances of the connection lines equal.

[0051] In this embodiment, the first and second analog-to-digital conversion units 11 and 12 continuously sample at a high frequency, while the control algorithm of the control module 3 has a relatively long execution period. At the beginning of each calculation period, the control module 3 does not directly use the instantaneous value of a single sampling point, but extracts a plurality of latest sampling values (for example, 10 sampling values obtained in the last 1 ms) within a time window from each of the two analog-to-digital conversion units, and calculates the arithmetic mean value thereof. This processing method based on the average value of multiple period sampling can effectively suppress random errors and smooth abnormal jumps caused by power supply noise, electromagnetic interference, etc. in the sampling process, so as to obtain a stable and smooth voltage average value that can more truly reflect the direct current component of the signal. The current and impedance calculation based on this average value has stronger anti-interference ability, and the accuracy and reliability are significantly higher than the calculation result based on a single sampling value.

[0052] As an optional embodiment, a timer interrupt (e.g., every 1 ms) can be used to periodically trigger data acquisition and calculation.

[0053] In an exemplary embodiment, with reference to Figure 3 The variable impedance module 2 includes a digital potentiometer, which includes a resistance chain in series and a tap selection network connected to a plurality of nodes of the resistance chain respectively; the tap selection network is configured to electrically connect a selected node of the resistance chain to the wiper of the digital potentiometer in response to a control signal, so as to set the impedance value of the digital potentiometer.

[0054] In this embodiment, the digital potentiometer is composed of a resistance chain formed by a series of resistance units with accurate resistance values. Each connection point on the resistance chain is a node. The tap selection network is usually composed of a group of analog switches (such as MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) switches), one end of each switch is connected to a specific node, and the other end is commonly connected to the wiper. The digital control signal sent by the control module 3 (usually transmitted through a digital bus such as I2C (Inter-Integrated Circuit), SPI (Serial Peripheral Interface), etc.) is decoded by the logic circuit in the tap selection network, and then the corresponding analog switch is turned on, so as to physically connect a selected node on the resistance chain with the wiper. The total resistance value of the digital potentiometer is fixed, but the resistance value between the wiper and one end depends on the position of the selected node in the resistance chain, thereby realizing digital setting of the resistance value.

[0055] The control module 3 can change the resistance value of the access circuit accurately and quickly by changing the control word (i.e. digital signal) sent to the digital potentiometer, so as to adjust the impedance of the branch. The resistance value adjustment is directly controlled by the digital signal, which has high accuracy, good repeatability, no mechanical wear problem, long service life and high reliability. The adjustment process does not require mechanical movement, has fast response speed, is easy to integrate with a digital control module such as a microcontroller, and realizes automatic control. The resistance value can be accurately set and memorized, which is suitable for current sharing systems that require precision, programmability and long-term stability, and provides a reliable hardware foundation for high-precision current sharing control.

[0056] In an exemplary embodiment, the digital potentiometer further comprises a register; the control module 3 is specifically configured to obtain the impedance of each connection line based on the voltage collected by the first analog-to-digital conversion unit 11 and the voltage collected by the second analog-to-digital conversion unit 12, determine a target connection line when it is determined that the impedance of each connection line does not satisfy the balance condition, and write the control word into the register in the digital potentiometer on the target connection line to generate a control signal; the control word is used to specify a selected node.

[0057] In this embodiment, the register is an important component inside the digital potentiometer, which is used to temporarily store the instruction data from the control module 3. When the control module 3 sends data (i.e. control word) to the target digital potentiometer through a digital communication bus (such as I2C or SPI), the data is first written into the register for temporary storage. The control word is usually a multi-bit binary number, and its value directly corresponds to the address or index of the target node on the resistance chain.

[0058] The control word in the register itself constitutes a digital control signal. The logic control circuit inside the digital potentiometer will interpret the control word and drive the analog switch in the tap selection network to act accordingly, so as to connect the node specified by the control word on the resistance chain to the sliding end, and complete the setting of the resistance value. Once the control word is written into the register, the resistance value will usually be updated immediately, or uniformly updated according to a specific instruction (such as a software synchronization update instruction).

[0059] It can be understood that the digital potentiometer can maintain the last set resistance value after power-on or before receiving a new instruction, which improves the stability of the system state. The control word is transmitted through the register, so that the setting of the resistance value becomes a precise digital mapping process, eliminating the drift error that may exist in the analog control signal and ensuring the setting accuracy and repeatability. Finally, this digital interface method simplifies the connection between the control module 3 and the execution module, improves the anti-interference ability and integration of the system, and ensures the accuracy, stability and reliability of the variable impedance module 2 adjustment.

[0060] In summary, the embodiment of the present application adopts the MCU (Microcontroller Unit) chip combined with the digital potentiometer to achieve the current sharing purpose. The MCU and the digital potentiometer replace the analog circuit in the traditional scheme, and the control logic is simplified and the high requirement for the PCB wiring space is reduced through the software algorithm. At the same time, the digital potentiometer and the MCU chip have high reliability and a longer service life than the analog resistor, and the fault is easier to troubleshoot and replace. The MCU combined with the digital potentiometer supports N+1 redundancy, which can automatically detect the fault module and exclude it when the system fails. The digital potentiometer can adjust the line impedance at the millisecond level, and the standby module does not need additional complex control logic to quickly match the working state of other modules, avoiding voltage or current surges that cause system abnormalities, and enhancing the reliability of the system.

[0061] The embodiment of the present application also provides an electronic device, including a load, a plurality of parallel power supply modules, and a current sharing system as described in any one of the above embodiments.

[0062] Please refer to Figure 4 The embodiment of the present application also provides a current sharing method, which applies the control module in the current sharing system as described in any one of the above embodiments, and the current sharing method includes: S101: obtaining the impedance of the connection line between the load interface and each power supply module in the electronic device based on the voltage collected by the first analog-digital conversion unit and the voltage collected by the second analog-digital conversion unit, wherein the voltage collected by the first analog-digital conversion unit includes the voltage across the sampling resistor arranged on the connection line, and the voltage collected by the second analog-digital conversion unit includes the voltage at the first sampling point arranged on the connection line close to the output end of the power supply module and the voltage at the second sampling point arranged on the connection line close to the load interface; S102: determining the target connection line when it is determined that the impedance of each connection line does not satisfy the balance condition; and S103: controlling the variable impedance module on the target connection line to adjust the impedance on the connection line, so that the impedance of each connection line is equal.

[0063] In an exemplary embodiment, the current sharing method further includes: calculating the difference of the current of any two connection lines, and determining that the impedance of each connection line does not satisfy the balance condition when the absolute value of any difference is greater than a preset threshold.

[0064] In an exemplary embodiment, the process of determining the target connection line includes: determining at least one of the two connection lines with the absolute value of the difference greater than the preset threshold as the target connection line.

[0065] In an example embodiment, the current sharing method further comprises: when it is determined that there is an abnormal connection line in which the current is greater than the safety current threshold, generating an alarm instruction and / or a power-off instruction, the alarm instruction being used to control an alarm module in the current sharing system to prompt alarm information corresponding to the abnormal connection line.

[0066] In an example embodiment, the process of obtaining the impedance of the connection line between the load interface in the electronic device and each power supply module based on the voltage collected by the first analog-to-digital conversion unit and the voltage collected by the second analog-to-digital conversion unit comprises: for each connection line, calculating the current flowing through the sampling resistor on the connection line based on the voltage collected by the first analog-to-digital conversion unit, and calculating the total voltage drop of the connection line based on the voltage collected by the second analog-to-digital conversion unit, and taking the ratio of the total voltage drop on the connection line and the current flowing through the sampling resistor as the impedance of the connection line.

[0067] In an example embodiment, the collection period of the first analog-to-digital conversion unit and the second analog-to-digital conversion unit is less than or equal to the calculation period of the control module; for each connection line, the process of calculating the current flowing through the sampling resistor on the connection line based on the voltage collected by the first analog-to-digital conversion unit, and calculating the total voltage drop of the connection line based on the voltage collected by the second analog-to-digital conversion unit, and taking the ratio of the total voltage drop on the connection line and the current flowing through the sampling resistor as the impedance of the connection line comprises: in each calculation period, for each connection line, obtaining the average value of the voltage collected by the first analog-to-digital conversion unit in the continuous multiple collection periods closest to the current time to calculate the current flowing through the sampling resistor on the connection line, and obtaining the average value of the voltage collected by the second analog-to-digital conversion unit in the continuous multiple collection periods closest to the current time to calculate the total voltage drop of the connection line, and taking the ratio of the total voltage drop on the connection line and the current flowing through the sampling resistor as the impedance of the connection line.

[0068] In an example embodiment, the variable impedance module comprises a digital potentiometer, the digital potentiometer comprising a resistance chain and a tap selection network connected to multiple nodes of the resistance chain respectively; the tap selection network is configured to electrically connect a selected node of the resistance chain to a sliding terminal of the digital potentiometer in response to a control signal, so as to set the impedance value of the digital potentiometer.

[0069] In an example embodiment, the digital potentiometer further comprises a register; the process of controlling the variable impedance module on the target connection line to adjust the impedance on the connection line comprises: writing a control word into the register in the digital potentiometer on the target connection line to generate a control signal; the control word is used to specify the selected node.

[0070] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is configured to execute the steps in any of the above-mentioned current sharing method embodiments when running.

[0071] In an example embodiment, the above-mentioned computer readable storage medium can include, but is not limited to, a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store computer programs.

[0072] The embodiment of the present application further provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to implement the steps in any of the above-mentioned current sharing method embodiments.

[0073] The embodiment of the present application further provides another computer program product, which comprises a non-volatile computer readable storage medium, and the non-volatile computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps in any of the above-mentioned current sharing method embodiments.

[0074] The skilled person can further realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in general terms in the above description. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0075] The above describes in detail the current sharing system, the electronic device and the current sharing method provided by the present application. The principles and implementation manners of the present application are described by applying specific examples in this paper, and the above description of the examples is only used to help understand the method and the core idea of the present application. It should be pointed out that, for the ordinary skilled person in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A flow sharing system, characterized in that, Applied to electronic devices, the electronic devices include a load interface and multiple power supply modules connected in parallel, wherein a connection line is provided between the load interface and each of the power supply modules, and the current sharing system includes: The detection module includes a sampling resistor disposed on the connection line, a first sampling point disposed on the connection line near the output terminal of the power supply module, and a second sampling point disposed on the connection line near the load interface. It also includes a first analog-to-digital conversion unit and a second analog-to-digital conversion unit. The first analog-to-digital conversion unit is configured to collect the voltage across the sampling resistor, and the second analog-to-digital conversion unit is configured to collect the voltage at the first sampling point and the voltage at the second sampling point, respectively. A variable impedance module is provided on the connection line and configured to adjust the impedance on the connection line in response to a received control signal. The control module, connected to the detection module and the variable impedance module, is configured to obtain the impedance of each connection line based on the voltage collected by the first analog-to-digital conversion unit and the voltage collected by the second analog-to-digital conversion unit. When it is determined that the impedance of each connection line does not meet the equalization condition, a target connection line is identified, and the control signal is sent to the variable impedance module on the target connection line to make the impedance of each connection line equal.

2. The flow sharing system according to claim 1, characterized in that, The control module is also configured to calculate the difference in current between any two of the connecting lines, and if the absolute value of any difference is greater than a preset threshold, it is determined that the impedance of each of the connecting lines does not meet the equalization condition.

3. The flow sharing system according to claim 2, characterized in that, The control module is specifically configured to obtain the impedance of each connection line based on the voltage collected by the first analog-to-digital conversion unit and the voltage collected by the second analog-to-digital conversion unit. When it is determined that the impedance of each connection line does not meet the equalization condition, at least one of the two connection lines whose absolute value of the difference is greater than the preset threshold is identified as the target connection line, and the control signal is sent to the variable impedance module on the target connection line to make the impedance of each connection line equal.

4. The flow sharing system according to claim 1, characterized in that, The control module is also configured to generate an alarm command and / or a power cut-off command when it is determined that there is an abnormal connection line in each of the connection lines with a current greater than the safe current threshold. The flow equalization system also includes: The alarm module is configured to display alarm information corresponding to the abnormal connection line when the alarm command is received.

5. The flow sharing system according to claim 1, characterized in that, The control module is specifically configured as follows: For each of the connection lines, the current flowing through the sampling resistor on the connection line is calculated based on the voltage collected by the first analog-to-digital conversion unit, and the total voltage drop of the connection line is calculated based on the voltage collected by the second analog-to-digital conversion unit. The ratio of the total voltage drop on the connection line to the current flowing through the sampling resistor is used as the impedance of the connection line. When it is determined that the impedance of each of the connection lines does not meet the equalization condition, a target connection line is identified, and the control signal is sent to the variable impedance module on the target connection line to make the impedance of each connection line equal.

6. The flow sharing system according to claim 5, characterized in that, The acquisition cycle of the first analog-to-digital conversion unit and the second analog-to-digital conversion unit is less than or equal to the calculation cycle of the control module; The control module is specifically configured as follows: In each calculation cycle, for each connection line, the average value of the voltage collected by the first analog-to-digital converter in the consecutive sampling cycles including the one closest to the current time is obtained to calculate the current flowing through the sampling resistor on the connection line. The average value of the voltage collected by the second analog-to-digital converter in the consecutive sampling cycles including the one closest to the current time is obtained to calculate the total voltage drop of the connection line. The ratio of the total voltage drop on the connection line to the current flowing through the sampling resistor is used as the impedance of the connection line. When it is determined that the impedance of each of the connection lines does not meet the equalization condition, a target connection line is identified, and the control signal is sent to the variable impedance module on the target connection line to make the impedance of each connection line equal.

7. The flow sharing system according to any one of claims 1-6, characterized in that, The variable impedance module includes a digital potentiometer, which includes a series resistor chain and a tap selection network connected to multiple nodes of the resistor chain respectively. The tap selection network is configured to electrically connect a selected node of the resistor chain to the sliding terminal of the digital potentiometer in response to the control signal, so as to set the impedance value of the digital potentiometer.

8. The flow sharing system according to claim 7, characterized in that, The digital potentiometer also includes a register; The control module is specifically configured to obtain the impedance of each connection line based on the voltage collected by the first analog-to-digital conversion unit and the voltage collected by the second analog-to-digital conversion unit. When it is determined that the impedance of each connection line does not meet the equalization condition, a target connection line is identified, and a control word is written into the register of the digital potentiometer on the target connection line to generate the control signal. The control word is used to specify the selected node.

9. An electronic device, characterized in that, It includes a load interface, multiple parallel power supply modules, and a current sharing system as described in any one of claims 1-8.

10. A flow sharing method, characterized in that, The control module applied to the current sharing system as described in any one of claims 1-8, wherein the current sharing method comprises: The impedance of the connection line between the load interface and each power supply module in the electronic device is obtained based on the voltage collected by the first analog-to-digital converter and the voltage collected by the second analog-to-digital converter. The voltage collected by the first analog-to-digital converter includes the voltage across the sampling resistor on the connection line, and the voltage collected by the second analog-to-digital converter includes the voltage at a first sampling point on the connection line near the output terminal of the power supply module and the voltage at a second sampling point on the connection line near the load interface. When it is determined that the impedance of each of the aforementioned connection lines does not meet the equalization condition, the target connection line is identified. The variable impedance module on the target connection line is controlled to adjust the impedance of the connection line so that the impedance of each connection line is equal.

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