Multi-source input intelligent management portable communication power supply system based on bidirectional DC / DC converter and current sharing control method

Abstract

The invention relates to the technical field of batteries, in particular to a current sharing control method of a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter. The system comprises a storage battery body, a multi-input / output interface module, a voltage conversion adjusting module and an intelligent control module. The storage battery is designed to be lightweight, multiple input interfaces support access of commercial power, solar energy and a vehicle-mounted power supply, the voltage conversion module guarantees stable voltage transformation, and the intelligent control module is responsible for monitoring, regulation and control. The current sharing control method comprises the following six steps: acquiring input source parameters, calculating target current and judging deviation, sending an adjusting instruction, adjusting the current and feeding back, checking the current matching degree, and locking a state or processing abnormity. And through sensor fault handling, in combination with optimization strategies such as storage battery state adjustment, high-precision acquisition and PID algorithm improvement, the control precision, stability and system adaptability are improved, and power supply stability and energy consumption optimization are both considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter. BACKGROUND

[0002] In scenarios requiring flexible deployment of communication equipment, stable power supply is the core of equipment operation, directly affecting the smoothness of communication links and the stability of data transmission. Currently, lithium iron phosphate batteries, due to their low cost, mature technology, and long service life, have become the mainstream choice for portable communication power supplies in such scenarios, adapting to temporary and mobile power supply needs. However, with the diversification of communication equipment, existing power supplies have obvious shortcomings. In terms of voltage output, most products can only provide a single voltage of 48V DC or 220V AC, while in practice, core communication equipment requires 48V power supply, and auxiliary devices rely on 220V power supply. Additional configuration of conversion modules increases cost and volume, and also increases voltage loss and failure risk, reducing power supply stability.

[0003] In terms of multi-input source control, although some power supplies integrate multiple input interfaces, they lack a scientific current sharing mechanism, which can easily cause unbalanced current distribution, resulting in energy waste or input source overload. When the sensor fails, there is no redundancy guarantee, and power supply is often directly interrupted. Moreover, the current sharing calculation does not take into account the remaining capacity and aging state of the battery, which can easily lead to overcharging and overdischarging, shortening the battery life and increasing safety hazards. In terms of portability and durability, existing power supplies often use metal casings and thick circuit boards, which are heavy and not conducive to transportation and deployment. The design of heat dissipation and environmental adaptability is insufficient, and under different conditions, the reliability of the power supply can be affected due to overheating of devices or damage to the casing, making it difficult to adapt to various scenarios. There is a lack of intelligence and energy consumption optimization, and traditional control algorithms do not take into account load priority and dynamic demand, resulting in poor current sharing accuracy and response speed under complex conditions. When the load is light, the system still maintains high-frequency sampling and full-channel power supply, wasting energy. Some systems have low sampling frequency and lack environmental compensation, which affects the accuracy of control decisions. SUMMARY

[0004] To solve the above-mentioned deficiencies of existing technology in terms of adaptability, reliability, portability, and intelligence, and to meet the diversified needs of power supply systems in different use scenarios, the present application proposes a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter and a current sharing control method,

[0005] The multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter includes a battery body, a multi-input interface module, a voltage conversion and regulation module, a multi-output interface module, and an intelligent control module.

[0006] The battery body adopts a lightweight design, the shell is a high-strength lightweight composite material, the internal battery pack is composed of a plurality of high-energy-density battery monomers through optimized series and parallel connection, the battery monomer adopts a new alloy electrode material, and the internal layout of the battery pack is compact and is provided with a heat dissipation structure;

[0007] The multi-input interface module is arranged on the battery body, includes a commercial power input interface, a solar input interface and a vehicle-mounted power supply input interface, is respectively connected with corresponding charging circuits, and each circuit is integrated on a same circuit board;

[0008] The voltage conversion and regulation module is connected with the battery body and the multi-output interface module, the multi-output interface module includes a 48V direct-current output interface and a 220V alternating-current output interface, the module adopts integrated power devices and high-frequency switching power supply technology, includes a DC-DC conversion unit and a DC-AC conversion unit, and is provided with a protection circuit and a voltage feedback regulation mechanism;

[0009] The intelligent control module is connected with each module, is provided with a microprocessor and a control algorithm, includes an input detection unit, an output control unit and a state display unit, and is used for monitoring input parameters, controlling output states and displaying working information.

[0010] The current equalization control method of the multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter includes the following steps:

[0011] S1: the intelligent control module synchronously collects voltage, current and power parameters of each input source through the input detection unit, and transmits the digital signals to the microprocessor after conversion;

[0012] S2: the microprocessor calculates target current equalization current values of each input source in combination with a remaining battery capacity and multi-output interface load demands, and determines whether a deviation between actual current and the target values exceeds an allowable range;

[0013] S3: if the deviation exceeds the allowable range, the intelligent control module sends an adjustment instruction containing a current compensation amount to the bidirectional DC / DC conversion unit, and simultaneously locks the working state of the input source that is in compliance with the deviation;

[0014] S4: the bidirectional DC / DC conversion unit adjusts the current of the corresponding input source by adjusting the on-duty ratio of the high-frequency switching tube, and feeds back the adjusted actual current value to the input detection unit;

[0015] S5: the intelligent control module monitors the load current change of the multi-output interface, checks whether the total current of each input source matches the total load current, and returns to step S2 to recalculate the target current equalization current value if the total current of each input source does not match the total load current;

[0016] S6: If the check passes and the deviation is within the compliance, lock the current current-sharing state; if an abnormal input source is detected, trigger the protection circuit to cut off the abnormal input source and alarm, and adjust the target current-sharing current value of other input sources.

[0017] Preferably, in step S1, if the mutation amplitude of the voltage data exceeds 20% of the rated value and the current data is 0 for 3 consecutive sampling periods, it is determined that the sensor is faulty, and the parameter acquisition is automatically switched to the backup sensor; if the backup sensor is also faulty, the average value of the parameters in the last 10 sampling periods in the historical data is used as the temporary input source parameter, and a local audible and visual alarm is triggered to ensure that the current-sharing control process is not interrupted.

[0018] Preferably, in step S2, when the microprocessor calculates the target current-sharing current value, the battery charge and discharge protection threshold is also considered. When the remaining battery capacity is lower than 20%, the target current-sharing current proportion of chargeable input sources such as photovoltaic and external power is increased, and the current output proportion of discharge-type input sources such as backup lithium batteries is reduced. When the SOC is higher than 90%, the current input of chargeable input sources is reduced to avoid overcharging of the battery, thereby prolonging the service life of the battery and ensuring the stability of the system power supply.

[0019] Preferably, in step S1, the input detection unit uses high-precision sensors to collect the voltage, current, and power parameters of each input source. The sensor sampling frequency is not less than 10 kHz, and a temperature compensation coefficient is introduced during the collection process to correct the current collection value, , where T is the working temperature of the sensor. The power parameter is calculated by the corrected current value and the voltage value .

[0020] Preferably, in step S2, when the microprocessor calculates the target current-sharing current value of each input source, an improved proportional-integral-derivative control algorithm is used, which introduces a battery aging factor , , the cycle number is ≤2000; and a load priority coefficient , critical load , and ordinary load . First, calculate the total target current according to formula (1) , and then dynamically correct the target current of each input source by the PID algorithm. The PID controller output formula is shown in formula (2), which improves the current-sharing control accuracy and response speed under complex working conditions: , , where I is the total load current, ​The target remaining power of the battery is 80% by default. The current remaining power is The rated capacity of the battery is , , The proportional, integral, and differential coefficients are The current deviation of the last cycle is The sampling period is

[0021] Preferably, in step S3, the current compensation amount in the adjustment instruction sent by the intelligent control module Based on the deviation rate , the input source type coefficient , photovoltaic , lithium battery ; fuel cell is calculated; the deviation rate formula is as shown in equation (3), and the current compensation amount formula is as shown in equation (4), which ensures the stability and rapidity of the current regulation when different types of input sources are connected, and avoids excessive or insufficient regulation: , , In the formula, is the basic adjustment step, and when the load fluctuation is greater than 10% , otherwise ; is the sign function, is the minimum function.

[0022] Preferably, in step S5, the intelligent control module uses the federated Kalman filter algorithm to fuse and denoise the multi-output interface load current data, and introduces the credibility weight of each interface data , , is the interface number; the filtering core formulas are as shown in equations (5) and (6), which ensure the accuracy of the current data when multiple loads fluctuate simultaneously; when the total current of each input source and the total current of the load are matched, a dynamic error range is set , and if the range is exceeded, the step S2 is returned to recalculate: , , In the formula, is the filtered value of the th interface in the th cycle, is the Kalman gain, is the original load current, is the observation matrix, is the number of output interfaces, is the estimated value of the total load current after fusion.

[0023] Preferably, in step S6, the time threshold of the deviation compliance is dynamically set, and the system stability margin is extended to 8s, otherwise 5s; when the input source anomaly is monitored, the voltage or current , is the grid stability coefficient, when the grid fluctuation is large ; the protection circuit cuts off the abnormal input source within 1ms and alarms, and the target current of the normal input source is redistributed according to formula (7): , In the formula, is the input source health state coefficient, the new device , the aging device is reduced according to the degree of attenuation; is the DC / DC conversion efficiency, is the total load current after fusion filtering.

[0024] Preferably, when the total power of the multi-output interface load is less than 10% of the rated load power for 5 minutes, the intelligent control module automatically reduces the sampling frequency of the input detection unit from 10kHz to 2kHz, and closes the idle channel power supply of the bidirectional DC / DC conversion unit that is not connected to the input source; when the load power rises to more than 30% of the rated load power, the sampling frequency and the idle channel power supply are restored, and the system itself energy consumption is reduced under light load working condition.

[0025] The beneficial effects of the present application are:

[0026] 1、In the system of the present application, the multi-input interface module integrates three types of input interfaces of power grid, solar energy and vehicle-mounted power supply, and is matched with 48V direct current and 220V alternating current double-output interfaces, which can adapt to multiple loads such as communication equipment and emergency terminals, and can not only be powered by power grid in fixed scene, but also meet the demand of portable communication, breaking the scene limitation of single power supply mode.

[0027] 2、In the system of the present application, the battery body adopts high-strength lightweight composite material shell and high-energy density battery monomer, which reduces the overall weight and improves portability, avoids battery pack overheating and aging through compact layout and built-in heat dissipation structure, and further improves the battery cycle life and charge-discharge stability by using new alloy electrode material, laying a hardware foundation for long-term reliable operation of the system.

[0028] 3. In the system of the present invention, the voltage conversion and regulation module adopts integrated power devices and high-frequency switching power supply technology, combined with DC-DC and DC-AC dual conversion units, which greatly improves energy conversion efficiency and reduces power loss; the protection circuit and voltage feedback regulation mechanism monitor voltage fluctuations in real time to avoid damage to the load and battery caused by overvoltage and undervoltage, and improve the safety of system operation.

[0029] 4. In the method of the present invention, the input detection unit achieves accurate acquisition of voltage, current and power parameters through high-frequency sampling and temperature compensation. Combined with the remaining battery power, charge and discharge protection threshold and load demand, the target current sharing is dynamically adjusted to avoid overcharging and over-discharging of the battery, ensure sufficient power supply to the load, extend battery life and ensure continuous operation of communication equipment.

[0030] 5. In the method of the present invention, an improved PID algorithm with the introduction of "battery aging factor + load priority coefficient" is adopted to dynamically correct the current distribution for batteries with different aging levels and loads with different priorities; combined with a current compensation strategy based on deviation rate and input source type coefficient, it avoids over- or under-adjustment when different types of input sources such as photovoltaic and lithium batteries are connected, and can still quickly achieve current sharing under complex working conditions.

[0031] 6. In the method of the present invention, when the sensor experiences a voltage surge exceeding the rated value by 20% or a current of 0 for three consecutive sampling cycles, it automatically switches to the backup sensor. If the backup sensor also fails, the average value of the parameters from the most recent 10 sampling cycles is used as the temporary input source parameter, and an audible and visual alarm is triggered to ensure that the current sharing control is not interrupted, avoid power outages caused by sensor failure, and ensure the continuity of communication services.

[0032] 7. In the method of the present invention, when an abnormal input source voltage or current is detected, the protection circuit cuts off the abnormal channel within 1ms. At the same time, it redistributes the normal input source current through the input source health status coefficient + DC / DC conversion efficiency to quickly reconstruct the power supply link. If the mains power is interrupted, the proportion of photovoltaic input is automatically increased to avoid system shutdown caused by a single input source failure and improve the reliability in emergency communication scenarios.

[0033] 8. In the method of the present invention, when the total power of the multi-output interface load is lower than 10% of the rated load power for 5 minutes, the intelligent control module automatically reduces the sampling frequency of the input detection unit and shuts down the power supply of the idle channel in the bidirectional DC / DC conversion unit that is not connected to the input source; when the load power rises to more than 30% of the rated load power, the sampling frequency and the power supply of the idle channel are restored, which greatly reduces the system's own energy consumption under light load, and is especially suitable for extending the battery life in outdoor scenarios without continuous power replenishment.

[0034] 9. In the method of the present invention, a federated Kalman filter algorithm with interface data credibility weight is introduced to fuse and denoise the load current data of multiple output interfaces, so as to avoid the deviation of current data when multiple loads fluctuate at the same time; a dynamic error range is set to verify the matching degree between the total current of each input source and the total load current, so as to ensure that the current distribution is always consistent with the actual needs, reduce ineffective energy loss, and improve the overall energy utilization efficiency. Attached Figure Description

[0035] Figure 1 This is a schematic diagram illustrating the steps of the current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter according to the present invention.

[0036] Figure 2 This is a schematic diagram of the multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter, according to the present invention. Detailed Implementation

[0037] A portable communication power supply system based on a bidirectional DC / DC converter with multi-source input intelligent management includes a battery body, a multi-input interface module, a voltage conversion and regulation module, a multi-output interface module, and an intelligent control module.

[0038] The battery body adopts a lightweight design, with the outer shell made of high-strength lightweight composite material. The internal battery pack is composed of multiple high-energy-density battery cells connected in series and parallel in an optimized manner. The battery cells use a new alloy electrode material. The internal layout of the battery pack is compact and equipped with a heat dissipation structure.

[0039] The multi-input interface module is located on the battery body and includes an AC power input interface, a solar power input interface and a vehicle power input interface, which are respectively connected to the corresponding charging circuits. All circuits are integrated on the same circuit board.

[0040] The voltage conversion and regulation module connects the battery body and the multi-output interface module. The multi-output interface module includes a 48V DC output interface and a 220V AC output interface. This module adopts integrated power devices and high-frequency switching power supply technology, and includes a DC-DC conversion unit and a DC-AC conversion unit. It is also equipped with protection circuits and a voltage feedback regulation mechanism.

[0041] The intelligent control module is connected to each of the aforementioned modules. It has a built-in microprocessor and control algorithm, including an input detection unit, an output control unit, and a status display unit, which are used to monitor input parameters, control output status, and display working information.

[0042] A current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter includes the following steps:

[0043] S1: The intelligent control module synchronously collects the voltage, current and power parameters of each input source through the input detection unit, converts them into digital signals and transmits them to the microprocessor;

[0044] S2: The microprocessor calculates the target current sharing value of each input source in combination with the remaining battery capacity and the load demand of the multi-output interface, and determines whether the deviation of the actual current from the target value exceeds the allowed range;

[0045] S3: If the deviation exceeds the allowed range, the intelligent control module sends an adjustment instruction containing the current compensation amount to the bidirectional DC / DC conversion unit, and locks the working state of the input source that meets the deviation requirement;

[0046] S4: The bidirectional DC / DC conversion unit adjusts the current of the corresponding input source by adjusting the on-duty ratio of the high-frequency switch tube, and feeds back the adjusted actual current value to the input detection unit;

[0047] S5: The intelligent control module monitors the load current change of the multi-output interface, checks whether the total current of each input source matches the total load current, and returns to step S2 for recalculation of the target current sharing value if they do not match;

[0048] S6: When the check is passed and the deviation is continuously met, the current current sharing state is locked; when an abnormal input source is detected, the protection circuit is triggered to cut off the abnormal input source and issue an alarm, and the target current sharing value of the other input sources is adjusted.

[0049] In step S1, if the voltage data mutation amplitude exceeds 20% of the rated value and the current data is 0 for 3 consecutive sampling periods, it is determined that the sensor is faulty, and the parameter acquisition is automatically switched to the backup sensor; if the backup sensor is also faulty, the average value of the parameters of the last 10 sampling periods in the historical data is used as the temporary input source parameter, and a local audible and visual alarm is triggered to ensure that the current sharing control process is not interrupted.

[0050] In step S2, when calculating the target current sharing value, the microprocessor also needs to consider the battery charge and discharge protection threshold. When the remaining battery capacity is lower than 20%, the target current sharing proportion of chargeable input sources such as photovoltaic and external power is increased, and the current output proportion of discharge-type input sources such as backup lithium batteries is reduced; when the SOC is higher than 90%, the current input of chargeable input sources is reduced to avoid overcharging of the battery, prolong the service life of the battery through dynamic adjustment, and ensure the stability of the system power supply.

[0051] In step S1, the input detection unit uses high-precision sensors to collect the voltage, current and power parameters of each input source, and the sensor sampling frequency is not less than 10 kHz, and a temperature compensation coefficient is introduced during the collection process to correct the current collection value, , The working temperature of the sensor; the power parameter is corrected by the current value The voltage value The calculation.

[0052] In step S2, the microprocessor calculates the target current value of each input source, uses an improved proportional integral derivative control algorithm, and introduces a battery aging factor , The number of cycles ≤2000; and the load priority coefficient Critical load Normal load First, calculate the total target current according to formula (1) Then, dynamically correct the target current of each input source by the PID algorithm, and the output formula of the PID controller is shown in formula (2), which improves the accuracy and response speed of the current sharing control under complex working conditions: , , In the formula, The total load current is The target remaining capacity of the battery is 80% by default; The current remaining capacity is The rated capacity of the battery; , , The proportional, integral, and differential coefficients are The current deviation of the last cycle is The sampling period is

[0053] In step S3, the current compensation amount in the adjustment instruction sent by the intelligent control module is Based on the deviation rate , the input source type coefficient Photovoltaic Lithium battery Fuel cell The calculation; the deviation rate formula is (3), and the current compensation amount formula is (4), which ensures the stability and rapidity of current sharing adjustment when different types of input sources are connected, and avoids excessive or insufficient adjustment: , , In the formula, The basic adjustment step is Otherwise ; The sign function is The minimum function is

[0054] In step S5, the intelligent control module adopts a federated Kalman filtering algorithm to fuse and denoise the multi-output interface load current data, and introduces the data reliability weight of each interface , , is the interface number; the filtering core formula is (5) and (6), which ensures the accuracy of the current data when multiple loads fluctuate at the same time; when the total current of each input source is matched with the total load current, a dynamic error range is set , and if the range is exceeded, step S2 is returned to recalculate: , , is the filtered value of the i th interface in the j th period, is the Kalman gain, is the original load current, is the observation matrix, is the number of output interfaces, is the estimated value of the total load current after fusion. In step S6, the time threshold for checking and deviation compliance is dynamically set, and the system stability margin is extended to 8s, otherwise it is 5s; when an abnormal input source is monitored, the voltage

[0055] or the current , is the grid stability coefficient, and when the grid fluctuates greatly ; the protection circuit cuts off the abnormal input source within 1ms and alarms, and simultaneously reallocates the target current of the normal input source according to formula (7): , , is the input source health status coefficient, and new devices are set to be high, and aging devices are set to be low according to the degree of attenuation; is the DC / DC conversion efficiency, is the total load current after fusion filtering.

[0056] When the total power of the multi-output interface load is continuously less than 10% of the rated load power for 5 minutes, the intelligent control module automatically reduces the sampling frequency of the input detection unit from 10kHz to 2kHz, and simultaneously closes the idle channel power supply of the bidirectional DC / DC conversion unit that is not connected to the input source; when the load power rises to more than 30% of the rated load power, the sampling frequency and the idle channel power supply are restored, thereby reducing the energy consumption of the system itself under light load conditions.

[0057] The embodiments of the application are as follows: ​​​

[0058] This embodiment applies the portable communication power supply system to the scene of outdoor temporary communication base station, which needs to provide stable power supply for signal transceiver equipment, monitoring equipment and emergency lighting equipment, and needs to adapt to the environment of no fixed city power supply and diversified energy supply outdoors.

[0059] When the system is deployed, the lightweight battery body is placed in the base station protection box. The high-strength lightweight composite material of the shell can resist outdoor minor collisions and weather erosion. The compact layout of the internal battery pack cooperates with the heat dissipation structure to adapt to the outdoor day and night temperature difference. The multi-input interface module is connected externally through the protection box reserved interface: the city power input interface is enabled when there is temporary city power access, the solar power input interface is connected with the portable solar panel erected beside the base station, and the vehicle power input interface is powered by the rescue vehicle in emergency; the charging circuit corresponding to each input interface is integrated on the same circuit board, reducing the occupied space of the system.

[0060] The multi-output interface module supplies power to the base station equipment: the 48V DC output interface connects the signal transceiver equipment and the monitoring equipment, and the 220V AC output interface connects the emergency lighting equipment; the voltage conversion and regulation module realizes the voltage conversion between the battery and the output interface through integrated power devices and high-frequency switching power supply technology, and the protection circuit and voltage feedback regulation mechanism ensure the stability of the output voltage in real time. The intelligent control module is embedded in the protection box control panel. The built-in microprocessor and control algorithm coordinate the work of each module. The state display unit displays the system input and output parameters, battery remaining capacity and other information in real time, which is convenient for operation and maintenance personnel to check.

[0061] After the system starts, the input detection unit of the intelligent control module collects the voltage, current and power parameters of the three types of input sources of city power, solar power and vehicle power through high-precision sensors, and the sampling frequency is not less than 10kHz. During the collection process, the temperature compensation coefficient is introduced to correct the current collection value, which eliminates the influence of outdoor temperature change on the accuracy of the sensor. The power parameter is calculated by the corrected current value and voltage value.

[0062] If the voltage data of an input source suddenly changes by more than 20% of the rated value, or the current data is 0 for 3 sampling periods, the system determines that the sensor is faulty, automatically switches to the standby sensor to continue collecting parameters; if the standby sensor is also faulty, the average value of the parameters of the last 10 sampling periods in the historical data is used as the temporary input source parameter, and the audible and visual alarm of the control panel is triggered at the same time, ensuring that the current control process is not interrupted and the continuity of the power supply of the base station equipment is ensured.

[0063] After receiving the parameter collection data, the microprocessor calculates the target current value of each input source in combination with the remaining battery capacity, the base station load demand, and the battery charge and discharge protection threshold. The calculation process uses an improved proportional-integral-derivative control algorithm. The introduced battery aging factor is dynamically adjusted according to the number of battery cycles, and the load priority coefficient is divided according to the importance of the equipment, among which the signal transceiver equipment is set as a key load, and the emergency lighting is set as a general load.

[0064] First, the total target current is calculated, which needs to match the total load current of each device of the base station, and is dynamically adjusted in combination with the difference between the target remaining battery capacity (default value 80%) and the current remaining capacity, and the rated capacity of the battery. Then, the target current of each input source is dynamically corrected through the PID algorithm. The output of the PID controller needs to be combined with the proportional, integral, and differential coefficients, as well as the current deviation of the last period and the sampling period, to optimize the response speed and improve the current sharing control accuracy under complex working conditions.

[0065] At the same time, the current distribution is adjusted in combination with the battery charge and discharge protection threshold: when the remaining battery capacity is lower than 20%, the target current sharing of the rechargeable input sources such as solar energy and commercial power is increased, and the current output proportion of the backup lithium battery (if the vehicle power supply is connected, the backup lithium battery is used as a discharge-type input source) is reduced, to preferentially charge the battery; when the SOC is higher than 90%, the current input of the charging-type input source is reduced to avoid overcharging the battery and prolong the service life of the battery.

[0066] The microprocessor compares the target current value of each input source calculated with the actual collected current value. If the deviation between the actual current and the target value exceeds the allowed range, the intelligent control module sends an adjustment instruction containing the current compensation amount to the bidirectional DC / DC conversion unit, and locks the input source working state that meets the deviation.

[0067] The current compensation amount needs to be calculated based on the deviation rate and the type coefficient of the input source, where solar energy, lithium battery, and fuel cell correspond to different type coefficients. The basic adjustment step is dynamically set according to the load fluctuation. When the load fluctuation is greater than a certain proportion, the adjustment step is increased, and vice versa. Through such setting, the stability and rapidity of current sharing adjustment when different types of input sources are connected are ensured, and over-adjustment or under-adjustment is avoided.

[0068] After receiving the adjustment instruction, the bidirectional DC / DC conversion unit adjusts the current of the corresponding input source by adjusting the conduction duty cycle of the high-frequency switch tube, and feeds back the adjusted actual current value to the input detection unit in real time, forming a closed-loop adjustment.

[0069] The intelligent control module monitors the load current changes of the multiple output interfaces through the input detection unit, adopts the federated Kalman filtering algorithm to fuse and denoise the load current data of each output interface, and sets the data credibility weight of each interface according to the importance of the interface equipment, so as to calculate the filtering value of each interface in different periods and the estimated value of the fused load total current, and ensure the accuracy of the current data when multiple loads fluctuate at the same time.

[0070] Based on the fused load total current, it is verified whether the total current of each input source matches the load total current, a dynamic error range is set, if it exceeds the range, the target current-sharing current calculation link is returned to recalculate the target current-sharing current value; if the verification is passed and the deviation between the actual current and the target value is continuously compliant, the system locks the current current-sharing state. The time threshold of the deviation continuously compliant is dynamically set and will be adjusted according to the system stability margin, the threshold is extended when the stability margin is higher, and vice versa, so as to balance the adjustment precision and response speed.

[0071] If an abnormal input source is monitored (such as voltage exceeding the safe range, current appearing abnormal fluctuation), the protection circuit cuts off the abnormal input source within 1ms and triggers an alarm, and at the same time, the target current of the normal input source is redistributed; the health state coefficient of the input source and the DC / DC conversion efficiency are introduced during the redistribution, the health state coefficient of the new device is higher, and the aging device is reduced according to the attenuation degree, so as to ensure that the normal input source can stably undertake the load demand and protect the base station equipment from power interruption.

[0072] When the base station is in a low business period, the total power of the multiple output interfaces is continuously lower than 10% of the rated load power for 5 minutes, the intelligent control module automatically reduces the sampling frequency of the input detection unit, and at the same time, the idle channel power supply of the bidirectional DC / DC conversion unit which is not connected to the input source is closed; when the load power rises to more than 30% of the rated load power, the sampling frequency and the idle channel power supply are restored, which reduces the energy consumption of the system itself in the light load working condition and further improves the endurance of the system.

Claims

1. A portable communication power supply system with multi-source input intelligent management based on a bidirectional DC / DC converter, characterized in that, It includes the battery body, a multi-input interface module, a voltage conversion and regulation module, a multi-output interface module, and an intelligent control module; The battery body adopts a lightweight design, with the outer shell made of high-strength lightweight composite material. The interior is composed of multiple high-energy-density battery cells connected in series and parallel in an optimized manner. The battery cells use a new type of alloy electrode material. The multiple battery cells are arranged in a compact layout. The battery body is also equipped with a heat dissipation structure. The multi-input interface module is electrically connected to the battery body, and the multi-input interface module includes an AC power input interface, a solar power input interface, and a vehicle power input interface; The voltage conversion and regulation module is electrically connected to the battery body and the multi-output interface module, respectively. The voltage conversion and regulation module includes a DC-DC conversion unit and a DC-AC conversion unit, and is equipped with a protection circuit. The multi-output interface module includes a 48V DC output interface and a 220V AC output interface; The intelligent control module is electrically connected to the battery body, the multi-input interface module, the voltage conversion and regulation module, and the multi-output interface module. The intelligent control module includes a microprocessor, an input detection unit, an output control unit, and a status display unit. The intelligent control module is used to monitor input parameters, control output status, and display working information. The multi-input interface module, voltage conversion and regulation module, multi-output interface module, and intelligent control module are all mounted on the battery body.

2. A current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter, characterized in that, Includes the following steps: S1: The intelligent control module synchronously collects the voltage, current, and power parameters of each input source through the input detection unit, converts them into digital signals, and transmits them to the microprocessor. S2: The microprocessor combines the remaining battery power and the load requirements of multiple output interfaces to calculate the target current sharing value of each input source and determine whether the deviation between the actual current and the target value exceeds the allowable range. S3: If the deviation exceeds the allowable range, the intelligent control module sends an adjustment command containing current compensation to the bidirectional DC / DC conversion unit, and at the same time locks the working state of the input source that complies with the deviation. S4: The bidirectional DC / DC conversion unit adjusts the corresponding input source current by adjusting the duty cycle of the high-frequency switching transistor, and feeds back the adjusted actual current value to the input detection unit. S5: The intelligent control module monitors the load current changes of multiple output interfaces and verifies whether the total current of each input source matches the total load current. If they do not match, it returns to step S2 and recalculates the target current sharing value. S6: When the verification passes and the deviation remains compliant, the current current sharing state is locked; when an abnormal input source is detected, the protection circuit is triggered to cut off the abnormal input source and issue an alarm, while adjusting the target current sharing value of other input sources.

3. The current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter according to claim 2, characterized in that, In step S1, if the voltage data fluctuation exceeds 20% of the rated value and the current data is 0 for 3 consecutive sampling cycles, the sensor is determined to be faulty and the system automatically switches to the backup sensor to collect parameters. If the backup sensor is also faulty, the average value of the parameters in the most recent 10 sampling cycles in the historical data is used as the temporary input source parameter, and a local audible and visual alarm is triggered to ensure that the current sharing control process is not interrupted.

4. The current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter according to claim 1, characterized in that, In step S2, when the microprocessor calculates the target current sharing value, it also needs to consider the battery charge and discharge protection threshold. When the remaining battery power is less than 20%, the proportion of the target current sharing from rechargeable input sources such as photovoltaics and external mains power is increased, while the proportion of the current output from discharge-type input sources such as backup lithium batteries is reduced. When the SOC is higher than 90%, the current input from rechargeable input sources is reduced to avoid overcharging of the battery. By dynamically adjusting, the battery life is extended, and the stability of the system power supply is ensured.

5. The current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter according to claim 2, characterized in that, In step S1, the input detection unit uses high-precision sensors to collect the voltage, current, and power parameters of each input source. The sensor sampling frequency is not less than 10kHz, and a temperature compensation coefficient is introduced during the acquisition process. Correct the current acquisition value. , The sensor's operating temperature; the power parameter is obtained by adjusting the current value. With voltage value calculate.

6. The current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter according to claim 2, characterized in that, In step S2, when the microprocessor calculates the target current sharing value for each input source, it employs an improved proportional-integral-derivative control algorithm and incorporates a battery aging factor. , Loop count ≤ 2000; and load priority coefficient. Critical load Normal load First, calculate the total target current according to formula (1). Then, the target current of each input source is dynamically corrected through the PID algorithm. The output formula of the PID controller is shown in (2), which improves the accuracy and response speed of current sharing control under complex working conditions. ， ， In the formula, This is the total load current. The target remaining battery charge is 80% by default. This is the current remaining battery level. This refers to the rated capacity of the battery. , , These are the proportional, integral, and differential coefficients, respectively. This is the current deviation from the previous cycle. The sampling period.

7. The current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter according to claim 2, characterized in that, In step S3, the adjustment command sent by the intelligent control module includes the current compensation amount. Based on deviation rate Input source type coefficients Photovoltaics lithium batteries fuel cells Calculation; the deviation rate formula is as shown in (3), and the current compensation formula is as shown in (4), to ensure the stability and speed of current sharing adjustment when different types of input sources are connected, and to avoid over- or under-adjustment: ， ， In the formula, Adjust the step size based on load fluctuation >10% ,otherwise ; For symbolic functions, To take the smaller function.

8. The current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter according to claim 2, characterized in that, In step S5, the intelligent control module uses a federated Kalman filter algorithm to fuse and denoise the load current data from multiple output interfaces, introducing a confidence weight for each interface's data. , , For the interface number; the core filtering formulas are as follows (5) and (6), to ensure the accuracy of current data when multiple loads fluctuate simultaneously; when verifying the matching of the total current of each input source with the total load current, set the dynamic error range. If the value is outside the range, return to step S2 to recalculate. ， ， In the formula, For the first The first interface Periodic filter value, For Kalman gain, This is the original load current. For the observation matrix, For the number of output interfaces, This is the estimated total load current after merging.

9. The current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter according to claim 2, characterized in that, In step S6, the time threshold for successful verification and sustained compliance with deviations is dynamically set, and its system stability margin is... The time threshold is extended to 8 seconds, otherwise it is 5 seconds; when an abnormal input source is detected, the voltage... or current , This is the power grid stability coefficient; when power grid fluctuations are large... The protection circuit cuts off the abnormal input source and alarms within 1ms, and at the same time redistributes the target current of the normal input source according to formula (7): ， In the formula, For the input source health status coefficient, the new device The aging equipment is reduced according to the degree of degradation; For DC / DC conversion efficiency, This represents the total load current after fusion filtering.

10. The current sharing control method for a multi-source input intelligent management portable communication power supply system based on a bidirectional DC / DC converter according to claim 2, characterized in that, When the total load power of the multi-output interface remains below 10% of the rated load power for 5 minutes, the intelligent control module automatically reduces the sampling frequency of the input detection unit from 10kHz to 2kHz, and simultaneously shuts off the power supply to the idle channels in the bidirectional DC / DC conversion unit that are not connected to an input source. When the load power rises back to above 30% of the rated load power, the sampling frequency and the power supply to the idle channels are restored, thereby reducing the system's own energy consumption under light load conditions.

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