Topology and Control Strategy of Supercapacitor Energy Storage System for Continuous UAV Electromagnetic Catapult

Continuous electromagnetic catapult technology is the core key equipment for rapid delivery, cluster takeoff and landing, and mobile assault of swarm UAVs. Different from single-shot large-scale electromagnetic catapults, it features short-interval high-frequency continuous launching, transient pulsed high power, intermittent energy storage standby, and drastic dynamic load fluctuation. A single catapult requires the release of ultra-large pulsed electric energy within milliseconds to complete continuous multi-launch missions in a short cycle, placing extremely high requirements on the energy storage system in terms of topological simplicity, instantaneous power output, fast recharging capability, voltage regulation accuracy and continuous launching stability. Traditional single battery energy storage suffers from insufficient discharge rate, poor pulse resistance, severe performance attenuation during continuous launches and short service life, while pure flywheel energy storage has inherent drawbacks such as mechanical response delay, complex structure and weak mobile adaptability. Leveraging the superior characteristics of supercapacitors including high power density, millisecond-level ultra-fast response and million-level high-frequency pulse cycle durability, a dedicated energy storage topology and intelligent control strategy tailored for continuous UAV catapults can thoroughly solve industrial pain points such as power collapse, voltage drop and inconsistent initial velocity during high-frequency launching, ensuring stable, rapid and accurate continuous launch of UAV clusters.

1. Core Operating Conditions and Design Requirements of Energy Storage System for Continuous Catapult

Continuous UAV electromagnetic catapults operate with high-frequency, short-interval and pulsed energy release as the core working mode. The system repeatedly cycles through “energy storage standby — instantaneous energy release — fast recharging”, with design requirements significantly different from conventional steady-state energy storage and single-shot catapult systems.

First, ultra-high transient power output: A single catapult releases peak pulsed power within milliseconds to drive the linear motor and accelerate UAVs to takeoff speed, requiring zero response delay and sufficient instantaneous power output without power bottlenecks. Second, high-frequency continuous launching stability: Multiple consecutive launches within a short period demand fast system recharging without performance attenuation, avoiding insufficient voltage, reduced initial velocity and launch failure in later continuous launching stages. Third, lightweight and mobile adaptability: Adaptable to vehicle-mounted, airborne and field mobile deployment, the system requires a simplified topology, high integration, high volumetric power density and low maintenance. Fourth, high-precision voltage stabilization control: Dynamically suppress instantaneous voltage drop and power oscillation during launching to guarantee consistent initial velocity of each UAV and meet cluster delivery accuracy requirements. Fifth, high reliability and durability: Capable of withstanding long-term high-frequency pulse charge-discharge impacts without cell aging or polarization failure, adapting to high-intensity continuous battlefield operations.

2. Core Topology Architecture of Supercapacitor Energy Storage System

According to the lightweight, mobile, high-pulse and fast-recharging characteristics of continuous UAV catapults, a battery + supercapacitor + bidirectional DC/DC converter hybrid energy storage topology is adopted. This architecture balances sustained energy supply and instantaneous peak power output, realizing the collaborative mechanism of “batteries for steady energy storage and supercapacitors for pulse peak load bearing”. It serves as the optimal lightweight topological solution for continuous catapult scenarios, featuring simplified structure, high controllability and high integration, and is suitable for portable and vehicle-mounted UAV catapult equipment.

2.1 Topology Hierarchy and Work Division

The system consists of three collaborative layers: a basic energy unit, an instantaneous power unit, and an intelligent conversion control unit. As the basic energy unit, batteries provide steady and continuous power during launch intervals through constant-current supplementary energy supply, avoiding cell aging caused by high-rate instantaneous impact loads. As the core instantaneous power unit, supercapacitors rely on ultra-low internal resistance and ultra-high discharge rate to bear all millisecond-level pulse peak loads and instantly compensate for huge power shortages during launch transients. The bidirectional DC/DC converter acts as the energy scheduling core, enabling controllable bidirectional power flow, precisely regulating battery charging rate and supercapacitor discharge characteristics, and realizing full-process management of energy storage, voltage stabilization, amplitude limiting and energy feedback.

2.2 Topology Operating Mechanism

During standby intervals, the bidirectional DC/DC converter operates in the forward charging mode. Batteries steadily charge supercapacitors at a low constant rate to achieve full-charge standby rapidly, reserving sufficient peak energy for subsequent launches with zero impact, overheating or energy loss. At the moment of launch triggering, the DC/DC converter locks the charging loop, and supercapacitors independently release full-power pulsed current within milliseconds, providing sufficient peak power for the linear catapult motor to ensure adequate startup thrust and linear and stable power output. After each launch, the system immediately switches back to charging mode for rapid supercapacitor reset, shortening launch intervals and improving overall cluster launch frequency. Meanwhile, the system recycles residual feedback energy in real time to optimize energy utilization and reduce overall power consumption.

2.3 Core Topology Advantages

Compared with single battery or pure supercapacitor topologies, this hybrid architecture eliminates inherent defects of traditional solutions. It avoids insufficient instantaneous discharge rate and rapid high-frequency attenuation of batteries, while compensating for the low energy capacity and static voltage drop shortcomings of pure supercapacitor systems. The simplified circuit design features low switching loss and zero response delay, perfectly adapting to high-frequency continuous pulse operating conditions. The modular and lightweight structure supports convenient deployment and vibration resistance, fully matching complex field and vehicle-mounted mobile combat scenarios.

3. Core Control Strategy for Continuous Launch Adaptation

Aiming at the characteristics of drastic dynamic load fluctuation, violent transient power mutation and high-precision voltage stabilization requirements in high-frequency continuous UAV launching, an integrated control strategy combining segmented energy management, fuzzy adaptive control, and voltage-current double closed-loop voltage stabilization protection is adopted. It realizes intelligent, precise and stable full-process system control to ensure deviation-free, fault-free and attenuation-free continuous multi-launch operations.

3.1 Segmented Energy Scheduling Control

System operation is divided into three timed stages: energy storage, launch energy release, and feedback reset, with targeted precise control. In the energy storage stage, constant-current and voltage-limited charging is adopted, with dynamically adjusted charging rates based on residual power to avoid overcharging and overheating and minimize recharging time. In the launch stage, the supercapacitor independent output mode is locked to isolate batteries from instantaneous impact loads and ensure sufficient peak power release. After launching, residual energy feedback and fast reset logic are activated to rapidly restore system standby status, compress launch intervals and improve operational efficiency.

3.2 Fuzzy Adaptive Power Control

To address uncertain factors such as dynamic load fluctuation, progressive supercapacitor voltage attenuation and variable environmental conditions during continuous launching, a fuzzy adaptive control algorithm is introduced. The system collects real-time data of capacitor voltage, output current and launch load parameters, dynamically corrects DC/DC conversion parameters and power output thresholds, and adaptively adjusts charging and discharging power. This eliminates voltage drift and power attenuation after multiple rounds of launching, ensuring highly consistent output power, propulsion thrust and initial velocity for every launch and significantly improving UAV cluster launch accuracy and uniformity.

3.3 Voltage-Current Double Closed-Loop Stabilization Control

A dual closed-loop control system with an outer voltage loop and an inner current loop is constructed to achieve high-precision transient voltage and current stabilization. The outer voltage loop monitors bus voltage in real time and dynamically suppresses instantaneous voltage drop and spike oscillation to stabilize the system operating reference. The inner current loop precisely limits instantaneous discharge current, balancing high-power output and equipment safety protection and eliminating transient overcurrent, undervoltage and power collapse faults.

3.4 Full-Condition Closed-Loop Fault Protection Strategy

Comprehensive protection logic including overvoltage, undervoltage, overcurrent, overheating, excessive charge-discharge frequency and short-circuit protection is configured for extreme high-frequency launching conditions. The system real-timely monitors cell consistency, temperature and voltage of supercapacitor modules and balances cell voltage differences dynamically to prevent unbalanced operation, local overheating and premature failure caused by long-term cycling. Abnormal parameter triggers will activate immediate current limiting, voltage stabilization and locking protection with fault data recording, ensuring equipment safety and stability during high-intensity continuous operations.

4. Core Application Value

Properly tailored for the high-frequency, pulsed, transient and mobile operating characteristics of continuous UAV electromagnetic catapults, this integrated supercapacitor topology and intelligent control solution solves the inherent defects of traditional launch systems, including weak continuous launching capability, poor stability, large initial velocity deviation, short equipment life and complicated maintenance. Through the collaborative architecture of supercapacitors undertaking peak power, batteries sustaining energy supply, and algorithms guaranteeing precision, it effectively improves launch frequency, launch consistency and battlefield mobile reliability of UAV catapult systems, reduces equipment failure rates and full-lifecycle operation and maintenance costs, and fully adapts to military scenarios such as rapid swarm UAV delivery, field mobile combat and multi-batch continuous takeoff missions.

5. Solution Summary

The core technological breakthrough of continuous UAV electromagnetic catapults lies in the stable and controllable high-frequency pulse transient energy storage. The optimized hybrid energy storage topology features concise structure, high efficiency and strong power adaptability. Combined with adaptive segmented energy management and double closed-loop voltage stabilization control, it realizes millisecond-level pulse energy release, fast cyclic recharging and high-precision continuous voltage stabilization, thoroughly breaking the continuous launching performance bottleneck of traditional energy storage systems. Tsingyane Electronics focuses on the supercapacitor field. Relying on military-grade pulse energy storage technology and rich practical experience in high-frequency operating conditions, we provide standardized, highly reliable and mass-deployable integrated solutions of supercapacitor energy storage topology and control strategy, empowering performance upgrading of rapid UAV cluster launch equipment.