A closed-loop inverter power conversion method and device for a battery pack to power a communication power supply device

Abstract

The application relates to a closed-loop inverter power conversion method and device for a battery pack to communicate with a power supply equipment, and belongs to the technical field of electric energy conversion. The method comprises the following steps: collecting the voltage, current and power factor of a communication equipment load side in real time, and calculating target active power of the load; combining conversion efficiency to calculate total input power of a power conversion unit DC side, collecting a battery bus voltage, and solving target input current of an inverter DC side; comparing and limiting the current with inverter rating and battery maximum discharge current to obtain a hardware-allowed maximum current, and determining an effective target input current; converting high-voltage DC power of the battery into AC power to supply the load through a conversion circuit according to the effective current; synchronously collecting load electric parameters to construct a closed-loop model, calculating a pulse width modulation duty cycle, dynamically adjusting a switch tube driving signal, closed-loop adjusting output electric parameters, stabilizing output AC power, and realizing battery pack power supply for the communication equipment. The application improves conversion efficiency and the stability of an AC output waveform.

Description

Technical Field

[0001] This invention relates to the field of power conversion technology, and in particular to a closed-loop inverter power conversion method and apparatus for a battery pack to power a communication power supply device. Background Technology

[0002] Communication power supply cabinets are core power supply guarantee equipment for communication systems such as mobile communication base stations and power communication facilities, directly determining the stability and reliability of communication network operation. Currently, the standardized configuration of traditional communication power supply cabinets mainly includes an AC input module, an AC / DC conversion module, a built-in lithium battery, a display control unit, and a data transmission unit (FSU). Its conventional power supply mode uses AC mains power as the core input, converting AC power to DC power required by communication equipment through the AC / DC conversion module. At the same time, the built-in lithium battery in the cabinet serves as a backup power source in case of power failure, realizing a stable power supply when the mains power is normal and a short-term emergency backup power supply when the mains power is interrupted. This is the main solution for the normalized power supply of communication sites at present.

[0003] However, existing communication power supply systems have significant technical defects and limitations in practical applications. On the one hand, the backup energy storage unit of traditional communication power supplies is merely a small, built-in lithium battery in a cabinet. The battery capacity is limited, and the energy storage time is short, only meeting the needs of short-term power outages and unable to adapt to long-term, large-scale power outage scenarios. On the other hand, existing communication power supply equipment only supports a single power supply mode from municipal mains and a single backup mode from the built-in battery. The power source is singular, lacking the interface for connecting external large-capacity energy storage devices and the ability to control power conversion. Especially in special scenarios such as power facility failures, natural disaster relief and rescue, the construction of temporary base stations in the field, and communication deployment in remote areas without mains power, municipal power networks are easily interrupted and difficult to restore quickly. The traditional communication power supply's reliance on a small-capacity built-in lithium battery backup mode will quickly fail, leading to power outages and shutdowns of communication sites, severely impacting the continuity of emergency communication support, disaster relief command, and field communication services. While there are some external energy storage power supply solutions in the industry, most are general-purpose energy storage devices that cannot be precisely adapted to the battery packs of new energy electric vehicles. They lack the ability to communicate and interact with the battery management system (BMS) of electric vehicles, and cannot accurately control the on / off state of the electric vehicle battery bus voltage and power output. They are unable to efficiently and stably convert the power of the large-capacity battery pack of electric vehicles into usable power for communication. At the same time, they cannot realize reverse charging of the electric vehicle battery pack by the grid, and do not have bidirectional charging and discharging functions. Their energy utilization rate is low, and their power supply stability is poor, which cannot meet the long-term, stable and uninterrupted power supply requirements of communication equipment in special scenarios.

[0004] New energy electric vehicle battery packs possess advantages such as large capacity, ample energy storage, high mobility, and rapid deployment, making them high-quality mobile energy storage resources. However, currently, these on-board energy storage resources have not yet formed a compatible power interaction system with communication power systems, failing to achieve bidirectional energy exchange between on-board battery energy storage and communication power supply systems. Consequently, a large amount of mobile energy storage resources are not effectively utilized in emergency communication power supply scenarios, resulting in a serious waste of energy storage resources. In summary, current communication power systems suffer from a single power supply mode, insufficient emergency endurance, inability to adapt to large-capacity on-board energy storage, and difficulty in meeting the communication power supply needs of complex emergency and special scenarios. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problems of the existing technology, such as the single power supply mode, low energy utilization rate, poor power supply stability, and inability to use the large-capacity mobile energy storage of electric vehicles to power communication power.

[0006] In a first aspect, to solve the above-mentioned technical problems, the present invention provides a closed-loop inverter power conversion method for a battery pack to a communication power supply device, comprising: S1. Real-time acquisition of AC output voltage, operating current, and real-time power factor of the load side of the communication power supply equipment; dynamic calculation of the target output active power of the load side of the communication power supply equipment based on the AC output voltage, the operating current, and the real-time power factor; calculation of the required total input power of the DC side of the power conversion unit based on the preset circuit conversion efficiency and the target output active power. S2. Collect the bus DC voltage of the battery pack; calculate the target input current of the inverter DC side based on the bus DC voltage and the required total input power; compare the target input current with the rated DC current of the inverter and the maximum allowable discharge current of the battery pack for limiting protection calculation to obtain the maximum allowable current in hardware. S3. Determine whether the target input current is greater than the maximum allowable current of the hardware. If so, the maximum allowable current of the hardware shall be used as the valid target input current; otherwise, the target input current shall be used as the valid target input current. S4. Based on the effective target input current, the high-voltage DC power of the battery pack is converted into AC power using a conversion circuit, and the AC power is input to the load side of the communication power supply equipment. The conversion circuit includes an inverter circuit, which includes a power switch. During operation, the actual AC voltage and current on the load side of the communication power supply equipment are collected in real time. A closed-loop control adjustment model is constructed based on the actual AC voltage and current. The pulse width modulation duty cycle of the inverter bridge is calculated based on the closed-loop control adjustment model, and the drive signal of the power switch is dynamically corrected to perform real-time closed-loop adjustment of the voltage and current of the AC power supply, thereby achieving stable AC power output and enabling the battery pack to supply power to the communication power supply equipment.

[0007] In one embodiment of the present invention, before step S1, the method further includes obtaining the communication message of the BMS controller of the battery pack, and sequentially performing physical cable connection confirmation, low-voltage auxiliary power-on, charging handshake, charging parameter setting, and pre-charging process on the battery pack, and turning on the DC+ and DC- bus contactors of the battery pack to output the high-voltage DC power of the battery pack to the external output cable.

[0008] In one embodiment of the present invention, step S4, which involves using a conversion circuit to convert the high-voltage direct current of the battery pack into AC power for supply, comprises the following steps: The conversion circuit further includes a step-down circuit; the step-down circuit uses the effective target input current as the control target to step down the high voltage DC to a stable fixed intermediate DC. The inverter circuit converts the stable intermediate DC power into a sinusoidal form through the power switch and LC filter circuit, and then converts it into AC power for power supply.

[0009] In one embodiment of the present invention, the buck circuit adopts an isolated buck topology; the inverter circuit adopts a high-power full-bridge inverter topology.

[0010] In one embodiment of the present invention, the mathematical expression of the target output active power is: ; in, Indicates the target output active power. This indicates the effective value of the AC output voltage on the load side. This indicates the effective value of the load-side operating current. This represents the real-time power factor.

[0011] In one embodiment of the present invention, the mathematical expression of the closed-loop control adjustment model is: ; in, Indicates the pulse width modulation duty cycle of the inverter bridge. This represents the proportionality coefficient. Represents the integral coefficient. This indicates the real-time deviation value of the AC output voltage. This indicates the current real-time sampling time.

[0012] In one embodiment of the present invention, the expression for the target input current is: ; ; in, Indicates the target input current. This indicates the total required input power on the DC side of the power conversion unit. This indicates the target output active power after compensation. Indicates the preset circuit conversion efficiency. This indicates the DC bus voltage of the battery pack.

[0013] Secondly, to solve the above-mentioned technical problems, the present invention provides a closed-loop inverter power conversion device for a battery pack supplying power to a communication power supply device, used to realize the above-mentioned closed-loop inverter power conversion method for a battery pack supplying power to a communication power supply device, comprising: The first acquisition and calculation module is used to acquire the AC output voltage, operating current and real-time power factor of the load side of the communication power supply equipment in real time; dynamically calculate the target output active power of the load side of the communication power supply equipment based on the AC output voltage, the operating current and the real-time power factor; and calculate the required total input power of the DC side of the power conversion unit based on the preset circuit conversion efficiency and the target output active power. The second acquisition and calculation module is used to acquire the bus DC voltage of the battery pack; calculate the target input current of the inverter DC side based on the bus DC voltage and the required total input power; compare the target input current with the rated DC current of the inverter and the maximum allowable discharge current of the battery pack for limiting protection calculation to obtain the maximum allowable current in hardware. The judgment module is used to determine whether the target input current is greater than the maximum allowable current of the hardware. If it is, the maximum allowable current of the hardware is taken as the valid target input current; otherwise, the target input current is taken as the valid target input current. A power conversion module is used to convert the high-voltage direct current of the battery pack into AC power supply based on the effective target input current using a conversion circuit, and input the AC power supply to the load side of the communication power supply equipment; wherein, the conversion circuit includes an inverter circuit; the inverter circuit includes a power switching transistor; The power conversion module includes a regulation submodule, which is used to collect the actual AC voltage and actual AC current on the load side of the communication power supply equipment in real time during the operation of the conversion circuit; construct a closed-loop control regulation model based on the actual AC voltage and actual AC current; calculate the inverter bridge pulse width modulation duty cycle based on the closed-loop control regulation model; dynamically correct the drive signal of the power switch; and perform real-time closed-loop regulation of the voltage and current of the AC power supply to achieve stable AC power output and complete the power supply of the communication power supply equipment by the battery pack.

[0014] In one embodiment of the present invention, an auxiliary power module is further included, which is used to output a preset voltage signal to wake up the BMS controller of the battery pack during the initial stage of communication.

[0015] In one embodiment of the present invention, a battery status monitoring module is further included, which is used to acquire in real time the battery status message and charging demand message sent by the BMS controller during the process of the battery pack supplying power to the communication power supply equipment, and dynamically match the power supply output parameters; when the battery pack shutdown abnormal message is received or the remaining battery power is lower than the discharge threshold, the module controls the power conversion output of the battery pack.

[0016] Compared with the prior art, the above-described technical solution of the present invention has the following advantages: (1) The closed-loop inverter power conversion method and device for battery pack power supply equipment of the present invention constructs an integrated power supply control logic of load power conversion, dual threshold current limiting, power conversion and closed-loop voltage regulation, which has significant advantages over traditional inverter power supply schemes. The present invention collects the voltage, current and power factor of the communication load to accurately calculate the target active power, and combines the conversion efficiency to calculate the DC input power, which can dynamically adapt to the fluctuating load conditions of the communication equipment and improve the power utilization rate. At the same time, the output current is corrected by dual current threshold limiting of the power battery and the inverter, which effectively avoids battery overcurrent and inverter overload faults and greatly improves the power supply safety. The load electrical parameter closed-loop adjustment model is used to correct the inverter pulse width modulation duty cycle in real time, accurately correct the output power parameters, suppress fluctuation deviation, ensure stable and high-quality power frequency AC output, meet the strict power supply requirements of communication equipment, and the overall control logic closed loop is reliable and practical.

[0017] (2) The present invention adopts a two-stage hierarchical power conversion architecture that combines isolated DC-DC step-down with full-bridge DC-AC inverter. In response to the wide range of high voltage fluctuation characteristics of the battery pack, the high voltage DC power that fluctuates greatly is first stabilized into a constant and stable intermediate bus voltage, effectively isolating the influence of battery side voltage fluctuation and voltage difference jump on the inverter output, so that the subsequent inverter circuit always maintains operation in the optimal stable operating range. Attached Figure Description

[0018] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is a flowchart of a closed-loop inverter power conversion method for a battery pack to a communication power supply device according to a preferred embodiment of the present invention. Figure 2 This is a structural diagram of a closed-loop inverter power conversion device for a battery pack supplying power to a communication power supply device according to a preferred embodiment of the present invention; Figure 3 This is a schematic diagram illustrating an application scenario of a closed-loop inverter power conversion device for supplying power to a communication power supply device according to a preferred embodiment of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0021] Example 1: Reference Figure 1 As shown, the present invention provides a closed-loop inverter power conversion method for a battery pack to power a communication power supply device, including but not limited to the following steps: S1. Real-time acquisition of AC output voltage, operating current and real-time power factor of the load side of the communication power supply equipment; dynamic calculation of the target output active power of the load side of the communication power supply equipment based on AC output voltage, operating current and real-time power factor; calculation of the required total input power of the DC side of the power conversion unit based on the preset circuit conversion efficiency and the target output active power. S2. Collect the DC bus voltage of the battery pack; calculate the target input current of the inverter DC side based on the DC bus voltage and the required total input power; compare the target input current with the rated DC current of the inverter and the maximum allowable discharge current of the battery pack for limiting protection calculation to obtain the maximum allowable current of the hardware. S3. Determine whether the target input current is greater than the maximum allowable current of the hardware. If so, the maximum allowable current of the hardware shall be used as the valid target input current; otherwise, the target input current shall be used as the valid target input current. S4. Based on the effective target input current, the high-voltage DC power of the battery pack is converted into AC power for power supply using a conversion circuit, and the AC power for power supply is input to the load side of the communication power supply equipment. The conversion circuit includes an inverter circuit, which in turn includes a power switch. During the operation of the conversion circuit, the actual AC voltage and current on the load side of the communication power supply equipment are collected in real time. Based on the actual AC voltage and current, a closed-loop control and regulation model is constructed. The pulse width modulation duty cycle of the inverter bridge is calculated based on the closed-loop control and regulation model, and the drive signal of the power switch is dynamically corrected to perform real-time closed-loop regulation of the voltage and current of the AC power supply, thereby achieving stable AC power output and enabling the battery pack to supply power to the communication power supply equipment.

[0022] This invention discloses a closed-loop inverter power conversion method for power supply equipment to communication devices using a battery pack. It constructs an integrated and complete power supply control logic encompassing load power acquisition and conversion, dual-threshold current safety limiting, power conversion output, and closed-loop waveform voltage regulation. This method accurately calculates the real-time target active power of the load by acquiring multiple electrical parameters in real time, including AC voltage, operating current, and power factor. It then combines this with the circuit conversion efficiency to calculate the total DC input power. This allows for adaptive power matching to adapt to the dynamically fluctuating power consumption conditions of communication equipment, avoiding the shortcomings of traditional inverters with fixed power output and single sampling dimensions. It effectively solves the problems of power matching imbalance, insufficient or excessive power supply redundancy when load conditions change, significantly improving energy utilization efficiency. Meanwhile, this invention employs a dual-dimensional current limiting protection mechanism for both the power battery and the inverter. It combines the maximum allowable discharge current of the battery with the rated DC current of the inverter as dual hardware thresholds to correct and filter the target input current. Through hierarchical current comparison and judgment logic, it adaptively matches the optimal effective output current. This ensures sufficient power supply to the load under normal, light-load conditions while automatically limiting protection under high-power overload conditions. It balances the upper limit of the power battery's discharge safety with the inverter's hardware load-bearing capacity, mitigating the risk of battery overcurrent and inverter overload damage from the algorithm's pre-processing level, thus improving the operational reliability and lifespan of the equipment and power battery. Furthermore, this invention continuously collects actual load-side voltage and current parameters during the power conversion process to build a closed-loop regulation model. By dynamically correcting the power switch drive signal through real-time calculation of the inverter bridge pulse width modulation duty cycle, it performs real-time correction of the output AC parameters, effectively suppressing electrical parameter deviations caused by load fluctuations, avoiding static output errors, and achieving stable output of industrial frequency AC power. The output waveform quality is excellent, and the power supply accuracy is high, meeting the stringent power supply requirements of communication power supply equipment for high stability and high continuity. This method effectively overcomes the technical shortcomings of traditional vehicle-mounted inverter power supply control logic being simple and lacking precise power matching and closed-loop voltage regulation, and significantly improves the intelligence level and engineering practical value of the battery pack's external emergency power supply.

[0023] Specifically, before step S1, the process includes obtaining communication messages from the BMS controller of the battery pack (such as the battery pack in a new energy vehicle), and sequentially performing physical cable connection confirmation, low-voltage auxiliary power-on, charging handshake, charging parameter setting, and pre-charging process on the battery pack. This involves activating the DC+ and DC- contactors of the battery pack's bus to output the high-voltage DC power from the battery pack to the external output cable. The communication between the battery pack and the BMS controller is achieved via a CAN bus, and the communication message transmission fully complies with the charging communication protocol requirements of the national standard for interaction between charging piles and electric vehicles (GB / T27930-203).

[0024] This invention provides an output cable that transmits energy from the battery pack in a new energy vehicle. Its primary function is to establish a high-voltage power transmission channel, delivering high-voltage DC power from the battery with low loss, providing energy input for downstream conversion circuits and communication loads. The cable employs a multi-layered insulation structure to achieve high-voltage safety isolation, and a shielding layer suppresses high-voltage electromagnetic interference, ensuring that control signals such as load power acquisition and inverter closed-loop regulation remain undisturbed. Simultaneously, the cable possesses flexible and weather-resistant characteristics, adapting to vehicle vibration and wide-temperature environments. It can both discharge power externally and transmit charging energy in reverse, supporting both national standard fast charging and slow charging bidirectional energy flow, maintaining continuous and stable operation of the overall power supply and charging system.

[0025] Further, the specific steps for confirming the physical cable connections of the battery pack, performing low-voltage auxiliary power-on, charging handshake, setting charging parameters, and pre-charging process, and then activating the DC+ and DC- contactors of the battery pack bus to output the high-voltage DC power from the battery pack to the external output cable are as follows: During the physical cable connection confirmation phase, after the vehicle charging plug is inserted into the socket, the connection validity is determined by the conduction status of the CC1 and CC2 circuits; when the voltage of the charger detection circuit reaches the first preset value (e.g., 4V), it is determined that the charging interface is fully plugged in; when the voltage of the vehicle-side detection circuit reaches the second preset value (e.g., 6V), the connection is confirmed to be normal.

[0026] During the low-voltage auxiliary power-on phase, the external charger activates the low-voltage auxiliary power supply circuit and outputs a 12V low-voltage auxiliary power signal A+, thus waking up the BMS controller.

[0027] During the charging handshake phase, the charger sends a CHM handshake message carrying protocol version information; after receiving the message, the BMS controller replies with a BHM message, which carries the maximum allowed charging voltage limit for the vehicle.

[0028] During the charging parameter setting phase, the BMS controller sends a BCP message to report charging constraint parameters such as the maximum charging voltage and maximum charging current of the battery; the charger synchronously feeds back a CML message carrying its maximum output capacity and a CTS message for timing synchronization; after the interaction between the two parties is completed, they send BRO (vehicle ready) and CRO (charger ready) messages respectively to confirm that the pre-charging preparations are ready.

[0029] During the pre-charging process, the BMS controller continuously sends BCS battery status messages and BCL charging demand messages; the charger adjusts the output power in real time according to the BCL messages and sends CCS charging status messages to synchronize its own working conditions.

[0030] During the charging completion phase, if a charging failure occurs or the battery is fully charged, the BMS controller sends a BST stop message to cut off the charging process; after receiving the termination command, the charger sends a CSD message and uploads complete statistics of this charging.

[0031] After completing all the pre-processing steps, including physical connection verification, insulation detection, low-voltage auxiliary power-on, protocol handshake, parameter configuration, and pre-charging, the DC+ and DC- contactors of the battery BMS bus are turned on to stably output the energy of the new energy vehicle battery pack to the external output cable.

[0032] Specifically, in steps S1 and S2, the required AC voltage and rated operating current of the communication power supply load side are collected in real time through the communication sampling loop; the original operating data such as the bus DC voltage, maximum allowable discharge current, remaining capacity, and protection threshold uploaded by the battery pack are read synchronously. The target output active power is calculated based on the load condition requirements, and the required input power on the DC side is derived in reverse by combining the target required power factor (the power circuit conversion efficiency loss is taken into account in the calculation process); based on the total input conversion efficiency and the bus voltage reported by the BMS, the target input current on the DC side of the inverter is obtained.

[0033] Specifically, since communication power supply equipment (such as communication power cabinets) has the ability to acquire output voltage and output current in real time with millisecond-level response, in step S1, the communication sampling circuit of the communication power supply equipment is used to acquire the AC output voltage, operating current, and real-time power factor of its load side in real time. The total voltage and current demand data required by the load are read through the RS485 communication bus, and the acquired load demand data is processed. In this embodiment, the initial default output demand voltage is set to 55.5V, and the initial demand current is taken as the maximum output current of the communication power supply equipment; this demand current can be dynamically adjusted according to the actual load capacity, and after dynamic conversion, the target voltage and target current are output to match the load conditions. The total power required by the load is calculated based on the converted voltage and current, and this is used as the control benchmark for the output adjustment of the communication power supply equipment. The mathematical expression for calculating the target output active power on the load side of the communication power supply equipment is: ; in, Indicates the target output active power. This indicates the effective value of the AC output voltage on the load side. This indicates the effective value of the load-side operating current. Indicates the real-time power factor of the load. This represents the phase difference between voltage and current. The method for obtaining the real-time power factor is as follows: synchronously sample the instantaneous values ​​of AC voltage and AC current on the load side of the communication power supply equipment at the same moment; discretely sample the voltage and current within a complete power frequency cycle, and calculate the effective value of the AC output voltage on the load side. Effective value of operating current And calculate the phase difference between voltage and current. The cosine of the phase difference is taken to obtain the real-time power factor for the current cycle. The power factor value is refreshed once every power frequency cycle and used as the real-time input parameter for calculating the target output active power in step S1.

[0034] Furthermore, based on the preset circuit conversion efficiency and target output active power, the specific steps for calculating the required total input power on the DC side of the power conversion unit are as follows: S110. Introduce a dynamic prediction and compensation mechanism specifically for communication load, extract historical load power data within a preset sliding time window, and calculate the power lead compensation coefficient. The specific steps are as follows: S111. Perform differential calculation on multiple consecutive frames of power data within the sliding window to solve for the real-time rate of change of load power. It is used to characterize the rate of transient change in load power.

[0035] S112. Analyze the extreme values ​​of the deviation between the power data and the steady-state average power within the statistical window, and extract the instantaneous load fluctuation amplitude. It is used to characterize the rate of transient change in load power.

[0036] S113. Using power change rate and instantaneous fluctuation amplitude as dual input feature parameters, the real-time compensation coefficient is obtained through dynamic iterative calculation using a weighted coupled prediction model. The specific expression is: ; in, , This indicates a preset non-zero weighted correction coefficient, which is calibrated according to the load conditions of the communication power supply equipment, so that the compensation coefficient adapts and dynamically changes with the transient fluctuation trend of the load, rather than being a fixed constant.

[0037] S120. The compensated target output active power is obtained through the correction formula. This allows for early prediction of sudden pulse-like power surges in communication power supply equipment, proactively correcting the output power reference to avoid current-limiting shutdowns and voltage fluctuations caused by instantaneous power surges in the communication load. The correction formula is as follows: .

[0038] S130. Based on the preset circuit conversion efficiency and the target output active power after compensation, calculate the required total input power on the DC side of the power conversion unit. The specific expression for the required total input power is as follows: ; in, This indicates the total required input power on the DC side of the power conversion unit. This indicates the target output active power after compensation; This represents the preset circuit conversion efficiency, with a value range of (0,1).

[0039] Specifically, in step S2, the target input current on the DC side of the inverter is calculated based on the bus DC voltage and the required total input power. The expression for the target input current is: ; in, Indicates the target input current. This indicates the DC bus voltage of the battery pack.

[0040] Furthermore, the calculated target input current Current limiting protection calculations are performed using the maximum allowable discharge current of the BMS controller and the rated DC current of the inverter, respectively, to obtain the maximum allowable current in hardware. The mathematical expression for the current limiting protection calculation is as follows: ; in, Indicates the maximum allowable current of the hardware. Indicates the maximum allowable discharge current of the battery pack. This indicates the rated DC current of the inverter.

[0041] Specifically, in step S3, when the calculated target input current is not greater than the maximum allowable current of the hardware, the entire unit outputs power stably according to the set target power; if the calculated target input current exceeds the maximum allowable current of the hardware, the equipment automatically performs derating control to constrain the output power of the entire unit, thereby avoiding overcurrent damage to the power battery and inverter. The bus DC voltage is also simultaneously monitored. Real-time verification is performed; once the DC voltage of the bus is detected... If the voltage drops below 300VDC or rises above 1000VDC, the entire machine will immediately be shut down for protection.

[0042] The battery pack outputs a wide-range high-voltage DC power of 300-1000VDC. This voltage cannot be directly inverted to generate standard power frequency AC power. Therefore, the battery pack bus voltage reported by the BMS controller is transformed through a multi-stage step-down and inverter circuit to obtain power frequency AC power to supply the communication power load.

[0043] Specifically, in step S4, the step of converting the high-voltage DC power from the battery pack into AC power using the conversion circuit of the power conversion unit is as follows: S410, the conversion circuit also includes a step-down circuit; the step-down circuit uses the effective target input current as the control target to step down the high voltage DC to a stable fixed intermediate DC.

[0044] Specifically, in this embodiment of the invention, the step-down circuit is a front-stage DC-DC step-down converter, employing an isolated step-down topology. The target input current is... The target intermediate DC voltage serves as the objective for dual closed-loop control. This front-end circuit can uniformly step down the high-voltage DC current of the BMS bus, which fluctuates between 300VDC and 1000VDC, to a constant intermediate DC bus voltage, selectable between 700VDC and 400VDC. This circuit architecture can eliminate the interference of battery pack bus voltage fluctuations on the downstream inverter unit, enabling the inverter to continuously operate within its optimal operating voltage range and effectively improving the overall power conversion efficiency.

[0045] The S420 inverter circuit converts the stable intermediate DC power into a sinusoidal current through power switching transistors and an LC filter circuit, thus converting it into AC power for supply. The LC filter circuit is located on the output side of the inverter circuit.

[0046] Specifically, in this embodiment of the invention, the inverter circuit is a downstream DC-AC inverter converter, employing a high-power full-bridge inverter topology. This full-bridge inverter unit receives a stable intermediate DC voltage from the upstream output, and builds a closed-loop PI regulation model based on the AC output voltage and actual load current sampled in real time from the load side. It then calculates the Pulse Width Modulation (PWM) duty cycle in real time and dynamically updates the power switch drive signal. The power switch performs high-frequency chopping based on the real-time updated PWM drive signal, and the chopped voltage is then sinusoidally corrected by an LC filter circuit, converting the DC power into standard power frequency AC power and outputting it to the communication power load. The output power parameters match the power supply specifications of the communication equipment.

[0047] Specifically, based on the actual current value and AC output voltage, a closed-loop control and regulation model is constructed, and its mathematical expression is as follows: ; in, Indicates the pulse width modulation duty cycle of the inverter bridge. This represents the proportionality coefficient. Represents the integral coefficient. This indicates the real-time deviation value of the AC output voltage. This indicates the current real-time sampling time.

[0048] It should be noted that, in this embodiment of the invention, the power conversion unit is an integrated functional module, which integrates a conversion circuit. The DC side of the power conversion unit is the external high-voltage input port of the module that connects to the battery pack. The high-voltage DC power output from the battery pack is sent to the conversion circuit via the DC side of the power conversion unit. The conversion circuit first performs voltage regulation through an isolated DC-DC circuit, and then outputs the power to the DC side of the inverter, providing a stable DC input for the inverter circuit. The three components are arranged sequentially along the energy transmission path, and the power regulation and inversion conversion are completed step by step.

[0049] The conversion method described in this embodiment of the invention has the following advantages through the above design: First, this method, based on a dual-parameter weighted coupling predictive compensation mechanism of power change rate and instantaneous fluctuation amplitude, breaks away from conventional techniques such as fixed coefficient compensation and lag adjustment. It can accurately fit the transient power change trend of the communication load's pulse, dynamically and adaptively generate a power lead compensation coefficient, and correct the power output power reference in advance. This effectively avoids voltage fluctuations, waveform distortion, and false current limiting shutdowns caused by instantaneous power surges in communication equipment, significantly improving the transient response capability and operational stability of the power supply system. It adapts to the special power consumption conditions of high-frequency pulse fluctuations in communication loads, solving the problems of traditional inverter power supply's inability to predict load transient changes and its weak impact resistance.

[0050] Secondly, this invention sets up dual-threshold current limiting protection logic for both the battery and the inverter. It dynamically filters the maximum allowable discharge current of the battery and the rated DC current of the inverter, precisely limiting the effective output current of the entire unit. Compared to traditional solutions with only current limiting protection, this approach simultaneously considers the discharge safety threshold of the battery pack and the load-bearing limit of the inverter hardware, fundamentally preventing problems such as over-power discharge of the battery and overcurrent damage to the inverter. It is compatible with power supply conditions covering an ultra-wide high-voltage battery voltage range of 300VDC to 1000VDC, significantly improving the operational safety and lifespan of the equipment.

[0051] Third, this invention adopts a two-stage hierarchical power conversion architecture of isolated DC-DC step-down and full-bridge DC-AC inverter. First, the wide-range fluctuating high-voltage DC is regulated to a constant intermediate bus voltage, which effectively eliminates the interference of power battery voltage fluctuations on inverter output, allowing the inverter circuit to always work in the optimal operating range, effectively improving the overall power conversion efficiency and wide voltage adaptability, and is compatible with high-voltage battery packs of different models and different capacity specifications.

[0052] Fourth, this invention employs a PI zero-steady-state-error closed-loop control model with an integral component to collect load-side electrical parameters in real time, calculate voltage deviation, dynamically iteratively correct the PWM duty cycle of the inverter bridge power switch, and achieve sinusoidal power processing in conjunction with an LC filter circuit. This allows for precise and stable AC output voltage and current at the power frequency, reducing static output errors, producing excellent output waveform quality and high power supply accuracy. It meets the stringent power supply standards for high precision and stability in communication equipment, ensuring continuous and reliable operation.

[0053] Example 2: Based on the same inventive concept, this embodiment provides a closed-loop inverter power conversion device for a battery pack to power a communication power supply device. The principle of solving the problem is similar to the closed-loop inverter power conversion method for a battery pack to power a communication power supply device provided in Embodiment 1, and the repeated parts will not be described again.

[0054] Reference Figure 2 As shown, this embodiment provides a closed-loop inverter power conversion device for a battery pack supplying power to a communication power supply device, used to implement the closed-loop inverter power conversion method for a battery pack supplying power to a communication power supply device described in Embodiment 1, including: The first acquisition and calculation module is used to acquire the AC output voltage, operating current and real-time power factor of the load side of the communication power supply equipment in real time; dynamically calculate the target output active power of the load side of the communication power supply equipment based on the AC output voltage, operating current and real-time power factor; and calculate the required total input power of the DC side of the power conversion unit based on the preset circuit conversion efficiency and the target output active power. The second acquisition and calculation module is used to acquire the bus DC voltage of the battery pack; calculate the target input current of the inverter DC side based on the bus DC voltage and the required total input power; compare the target input current with the rated DC current of the inverter and the maximum allowable discharge current of the battery pack for limiting protection calculation to obtain the maximum allowable current of the hardware. The judgment module is used to determine whether the target input current is greater than the maximum allowable current of the hardware. If it is, the maximum allowable current of the hardware is used as the valid target input current; otherwise, the target input current is used as the valid target input current. The power conversion module is used to convert the high-voltage direct current of the battery pack into AC power for supply based on the effective target input current, and then input the AC power to the load side of the communication power supply equipment; wherein, the conversion circuit includes an inverter circuit; the inverter circuit includes a power switching transistor; The power conversion module includes a regulation submodule, which is used to collect the actual AC voltage and actual AC current on the load side of the communication power supply equipment in real time during the operation of the conversion circuit; construct a closed-loop control regulation model based on the actual AC voltage and actual AC current; calculate the inverter bridge pulse width modulation duty cycle based on the closed-loop control regulation model, dynamically correct the drive signal of the power switch tube, and perform real-time closed-loop regulation of the voltage and current of the AC power supply to achieve stable AC power output and complete the power supply of the battery pack to the communication power supply equipment.

[0055] Specifically, in this embodiment, the first acquisition and calculation module, the second acquisition and calculation module, the judgment module, and the power conversion module are all integrated inside the power conversion unit.

[0056] Specifically, the conversion device described in this embodiment includes a CAN communication unit, which has a built-in BMS communication module. This module realizes the exchange of messages with the BMS controller of the battery pack through the CAN bus, and the communication message transmission specifications fully comply with the charging communication protocol requirements of the national standard for interaction between charging piles and electric vehicles (GB / T27930-2023).

[0057] Specifically, the conversion device described in this embodiment further includes an auxiliary power supply module, used to output a preset voltage signal to wake up the BMS controller during the initial stage of communication. In this embodiment, the auxiliary power supply module preferably outputs a 12V wake-up voltage.

[0058] Specifically, the conversion device described in this embodiment also includes a battery status monitoring module, which is used to acquire in real time the battery status messages and charging demand messages sent by the BMS controller during the process of the battery pack supplying power to the communication power supply equipment, and dynamically match the power supply output parameters; when a battery pack shutdown abnormal message is received or the remaining battery power is lower than the discharge threshold, the module sends a shutdown control signal to the BMS controller to stop the power conversion output of the battery pack, and collects the power supply operation data through the power supply statistics message to end the power supply task.

[0059] Specifically, the conversion device described in this embodiment has a built-in high-power inverter (input DC voltage range: 300VDC~1000VDC), which can meet the power supply requirements of high-power communication power supplies. The high-power inverter integrates the inverter circuit described in Embodiment 1.

[0060] Specifically, the conversion device described in this embodiment also includes a discharge termination determination module. This module has built-in multiple discharge termination determination logics, supports user-defined discharge termination SOC thresholds, individual cell voltage thresholds, and whole pack voltage thresholds, and is compatible with various discharge stop triggering logics such as fault shutdown and manual shutdown. When any discharge stop condition is met and triggers the shutdown process, the conversion device sends a discharge termination message and a CST message to the BMS controller. After parsing the CST message, the BMS controller executes the shutdown control logic, disconnects the DC+ and DC- DC contactors on the bus, and cuts off the power battery energy output circuit, thus achieving discharge shutdown. During the entire data interaction and energy transmission process of the external battery pack, the device simultaneously performs real-time communication link detection and high-voltage insulation detection to ensure the operational safety of the entire energy transmission link.

[0061] It should be noted that the battery status monitoring module is used for real-time protection against battery anomalies during the power supply process, while the discharge termination determination module is used for standardized and orderly shutdown under preset conditions. The two form a dual shutdown protection logic, and the trigger priorities are distinguished as follows: battery fault and low power abnormality messages have the highest shutdown priority, and the battery status monitoring module immediately shuts down the power conversion; only when the battery status is normal and the user-defined discharge threshold is reached will the discharge termination determination module execute the complete shutdown interaction process.

[0062] The conversion device described in this embodiment also has fast charging and slow charging functions adapted to electric vehicles, and the entire charging process fully complies with the specifications of GB / T 27930-2023, GB / T 20234, and GB / T 18487. Specifically, the conversion device described in this embodiment includes AC / DC dual-path charging hardware and a national standard protocol communication module to achieve fast charging and slow charging compatibility: at the hardware level, it distinguishes between the AC slow charging OBC rectifier branch and the DC fast charging high-voltage direct charging branch, and is equipped with CP / CC1 / CC2 control guidance detection, low-voltage auxiliary power supply, and high-voltage interlock circuit. The charging interface, insulation protection, and grounding structure meet the specifications of GB / T 18487 and GB / T20234; at the control level, it has a built-in CAN communication unit. DC fast charging fully executes the vehicle-charging pile message interaction timing specified in GB / T 27930-2023, and AC slow charging completes charging pile identification and power matching through CP pulse signals. The device can automatically identify AC slow charging guns and DC fast charging guns, and sequentially complete the standardized process of gun activation, insulation detection, charging parameter negotiation, segmented constant current and constant voltage charging, and fault shutdown. The charging circuit and the external power supply circuit are set with hardware interlocks, and the entire charging process fully complies with three national standards.

[0063] Furthermore, referring to Figure 3 As shown, the conversion device described in this embodiment can be installed internally or externally in the communication power supply cabinet, and can continuously output stable power to communication power supply equipment such as communication power supply cabinets.

[0064] The conversion device described in this embodiment can establish communication with the electric vehicle BMS controller. By controlling the on / off state of the DC contactor on the electric vehicle battery bus side, it obtains the on-board battery bus voltage, and after inversion processing, connects it to the communication power cabinet, thereby using the electric vehicle battery pack as an emergency energy storage power source for the communication system. This device also realizes bidirectional charging and discharging regulation functions, enabling the on-board battery to supply power to external systems and the mains power to charge the electric vehicle in reverse. It fully utilizes the value of the large-capacity on-board energy storage, overcomes the shortcomings of existing technologies such as low energy utilization and insufficient emergency power supply stability, and is suitable for special operation scenarios such as emergency repair of power facilities, disaster emergency support, and temporary base station construction.

[0065] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0066] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0067] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0068] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0069] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A closed-loop inverter power conversion method for a battery pack supplying power to a communication power supply device, characterized in that, include: S1. Real-time acquisition of AC output voltage, operating current, and real-time power factor of the load side of the communication power supply equipment; dynamic calculation of the target output active power of the load side of the communication power supply equipment based on the AC output voltage, the operating current, and the real-time power factor; Based on the preset circuit conversion efficiency and target output active power, calculate the total required input power on the DC side of the power conversion unit; S2. Collect the bus DC voltage of the battery pack; calculate the target input current on the DC side of the inverter based on the bus DC voltage and the required total input power; The target input current is compared with the rated DC current of the inverter and the maximum allowable discharge current of the battery pack to calculate the limiting protection and obtain the maximum allowable current in hardware. S3. Determine whether the target input current is greater than the maximum allowable current of the hardware. If so, take the maximum allowable current of the hardware as the valid target input current. Conversely, the target input current is taken as the effective target input current; S4. Based on the effective target input current, the high-voltage DC power of the battery pack is converted into AC power using a conversion circuit, and the AC power is input to the load side of the communication power supply equipment. The conversion circuit includes an inverter circuit, which includes a power switch. During operation, the actual AC voltage and current on the load side of the communication power supply equipment are collected in real time. A closed-loop control adjustment model is constructed based on the actual AC voltage and current. The pulse width modulation duty cycle of the inverter bridge is calculated based on the closed-loop control adjustment model, and the drive signal of the power switch is dynamically corrected to perform real-time closed-loop adjustment of the voltage and current of the AC power supply, thereby achieving stable AC power output and enabling the battery pack to supply power to the communication power supply equipment.

2. The closed-loop inverter power conversion method for a battery pack to a communication power supply device according to claim 1, characterized in that, Before step S1, the process includes obtaining the communication message of the BMS controller of the battery pack, and sequentially performing physical cable connection confirmation, low-voltage auxiliary power-on, charging handshake, charging parameter setting, and pre-charging process on the battery pack, and turning on the DC+ and DC- contactors of the battery pack to output the high-voltage DC power of the battery pack to the external output cable.

3. The closed-loop inverter power conversion method for a battery pack to a communication power supply device according to claim 1, characterized in that, In step S4, the step of converting the high-voltage DC power of the battery pack into AC power using a conversion circuit is as follows: The conversion circuit further includes a step-down circuit; the step-down circuit uses the effective target input current as the control target to step down the high voltage DC to a stable fixed intermediate DC. The inverter circuit converts the stable intermediate DC power into a sinusoidal form through the power switch and LC filter circuit, and then converts it into AC power for power supply.

4. The closed-loop inverter power conversion method for a battery pack to a communication power supply device according to claim 3, characterized in that, The step-down circuit adopts an isolated step-down topology; the inverter circuit adopts a high-power full-bridge inverter topology.

5. The closed-loop inverter power conversion method for a battery pack to a communication power supply device according to claim 1, characterized in that, The mathematical expression for the target output active power is: ; in, Indicates the target output active power. This indicates the effective value of the AC output voltage on the load side. This indicates the effective value of the load-side operating current. This represents the real-time power factor.

6. The closed-loop inverter power conversion method for a battery pack to a communication power supply device according to claim 1, characterized in that, The mathematical expression for the closed-loop control adjustment model is: ; in, Indicates the pulse width modulation duty cycle of the inverter bridge. This represents the proportionality coefficient. Represents the integral coefficient. This indicates the real-time deviation value of the AC output voltage. This indicates the current real-time sampling time.

7. The closed-loop inverter power conversion method for a battery pack to a communication power supply device according to claim 1, characterized in that, The expression for the target input current is: ; ; in, Indicates the target input current. This indicates the total required input power on the DC side of the power conversion unit. This indicates the target output active power after compensation. Indicates the preset circuit conversion efficiency. This indicates the DC bus voltage of the battery pack.

8. A closed-loop inverter power conversion device for a battery pack supplying power to a communication power supply device, used to implement the closed-loop inverter power conversion method for a battery pack supplying power to a communication power supply device as described in any one of claims 1 to 7, characterized in that, include: The first acquisition and calculation module is used to acquire the AC output voltage, operating current and real-time power factor of the load side of the communication power supply equipment in real time; and dynamically calculate the target output active power of the load side of the communication power supply equipment based on the AC output voltage, the operating current and the real-time power factor. Based on the preset circuit conversion efficiency and target output active power, calculate the total required input power on the DC side of the power conversion unit; The second acquisition and calculation module is used to acquire the bus DC voltage of the battery pack; and calculate the target input current on the DC side of the inverter based on the bus DC voltage and the required total input power. The target input current is compared with the rated DC current of the inverter and the maximum allowable discharge current of the battery pack to calculate the limiting protection and obtain the maximum allowable current in hardware. The judgment module is used to determine whether the target input current is greater than the maximum allowable current of the hardware. If so, the maximum allowable current of the hardware is taken as the valid target input current. Conversely, the target input current is taken as the effective target input current; A power conversion module is used to convert the high-voltage direct current of the battery pack into AC power supply based on the effective target input current using a conversion circuit, and input the AC power supply to the load side of the communication power supply equipment; wherein, the conversion circuit includes an inverter circuit; the inverter circuit includes a power switching transistor; The power conversion module includes a regulation submodule, which is used to collect the actual AC voltage and actual AC current on the load side of the communication power supply equipment in real time during the operation of the conversion circuit; construct a closed-loop control regulation model based on the actual AC voltage and actual AC current; calculate the inverter bridge pulse width modulation duty cycle based on the closed-loop control regulation model; dynamically correct the drive signal of the power switch; and perform real-time closed-loop regulation of the voltage and current of the AC power supply to achieve stable AC power output and complete the power supply of the communication power supply equipment by the battery pack.

9. A closed-loop inverter power conversion device for a battery pack supplying power to a communication power supply device according to claim 8, characterized in that, It also includes an auxiliary power module, which is used to output a preset voltage signal to wake up the BMS controller of the battery pack during the initial communication phase.

10. A closed-loop inverter power conversion device for a battery pack supplying power to a communication power supply device according to claim 9, characterized in that, It also includes a battery status monitoring module, which is used to acquire in real time the battery status messages and charging demand messages sent by the BMS controller during the process of the battery pack supplying power to the communication power supply equipment, and dynamically match the power supply output parameters; when the battery pack shutdown abnormal message is received or the remaining battery power is lower than the discharge threshold, the module controls the power conversion output of the battery pack.

Images