Power-off holding system for pan-tilt video of unmanned aerial vehicle

Abstract

The invention provides an unmanned aerial vehicle holder video power-off holding system, and the system comprises a holder mainboard which is used for processing, coding and storing a video or infrared signal collected by a holder; the power supply management module is used for monitoring the state of a main power supply and triggering switching of a standby power supply when abnormal power failure or an under-voltage abnormal state is detected; the standby power supply unit is used for providing temporary power support for the holder mainboard after the main power supply is interrupted; the data storage module is used for automatically storing current video stream data, cache data and key state information when a power-off event is triggered; according to the invention, the standby power supply is immediately started and seamless switching is carried out at the moment when the main power supply of the unmanned aerial vehicle is accidentally interrupted, so that the stability augmentation holder and the camera equipment thereof can be ensured to continuously and stably run for several seconds, key video data can be continuously acquired, and any interruption and important image information loss caused by sudden power failure are avoided.

Description

Technical Field

[0001] This invention relates to the field of unmanned aerial vehicle (UAV) system safety technology, and in particular to a power-off video retention system for a UAV gimbal. Background Technology

[0002] The rapid development of drone technology, especially in fields such as inspection, surveying, security monitoring, film and television shooting, and emergency rescue, has made real-time video acquisition and transmission using high-performance optoelectronic pods (gimbals) a core application scenario. Gimbal video data carries crucial on-site information, target status, and operational results; its continuity and completeness are essential for successful mission execution and subsequent analysis.

[0003] Currently, most drone systems are not designed with sufficient consideration for data preservation and function maintenance mechanisms in the event of a sudden power outage. First, existing power systems generally lack efficient and rapid backup power switching capabilities. Once the main power supply is interrupted due to battery failure, physical impact, electrical system malfunction, or human error, the entire gimbal system will immediately cease operation, resulting in the loss of video data being processed and cached, and the inability to recover important mission segments. Second, even if some systems use simple backup batteries, their response speed, power supply duration, and coordination with data storage processes are insufficient. They cannot achieve multiple objectives such as seamless power switching, proper data preservation, and stable gimbal attitude maintenance in a very short time, thus making it difficult to guarantee the continuity and integrity of critical data.

[0004] Therefore, in response to the problems mentioned above, this invention proposes a power-off video retention system for drone gimbals. Summary of the Invention

[0005] To overcome the problems of video data loss, service interruption, and gimbal malfunction in existing UAV gimbal systems during sudden power outages, this invention proposes a power-off video retention system for UAV gimbals. This system can activate a backup power supply within milliseconds after a power outage is detected, maintain the gimbal's normal operation for a short period, and automatically save cached video and critical data, maximizing the continuity and integrity of mission data.

[0006] The technical solution of this invention is: a power-off video retention system for a drone gimbal, comprising: The PTZ mainboard is used to process, encode, and store video or infrared signals captured by the PTZ. The power management module is used to monitor the status of the main power supply and trigger the switching of the backup power supply when an abnormal power outage or undervoltage abnormality is detected. The backup power unit, consisting of a supercapacitor or a small-capacity backup battery, is used to provide temporary power support for the gimbal motherboard after the main power is interrupted. The data storage module, which communicates with the power management module, is integrated into the embedded processing unit of the PTZ motherboard. It is used to automatically save the current video stream data, cached data, and key status information when a power failure event is triggered.

[0007] Preferably, abnormal states include, but are not limited to, sudden drops in battery voltage, abnormal current interruption, physical loosening of power interface, and other level signal changes that can indicate that the main power supply is about to fail or has already failed. The system operates as an independent subsystem, and its power failure detection, response, and data saving process does not depend on the UAV flight control main computer, thereby avoiding the risk of failure of the protection function due to the simultaneous failure of the flight control system.

[0008] Preferably, the power management module includes a power status detection circuit for real-time monitoring of the main power supply voltage and current status, a switching control circuit for automatically and quickly switching to the backup power supply when the main power supply is abnormal, and a supercapacitor management unit for charging and discharging control and status monitoring of the supercapacitor. The entire power management module responds quickly through optimized hardware circuit design, and the entire process from detecting an abnormality to completing the power switching takes less than 10 milliseconds.

[0009] Preferably, the switching control circuit adopts a MOSFET-based solid-state switching circuit, and its switching action is directly triggered by the comparator circuit, thereby achieving a microsecond-level switching speed, which is much faster than software response, thus ensuring that the power supply bus voltage of the gimbal system does not drop significantly.

[0010] Preferably, the supercapacitor management unit includes a charging control circuit for constant current or constant voltage charging of the supercapacitor when the main power supply is normal, a discharge control circuit for controlling the supercapacitor to discharge to the gimbal motherboard when the main power supply is interrupted, and a voltage monitoring circuit for real-time monitoring of the voltage across the supercapacitor. When the voltage of the supercapacitor drops to a preset threshold voltage due to discharge, the voltage monitoring circuit sends a signal to the data storage module to indicate that the available energy is about to be exhausted, which triggers the data storage completion sequence and ultimately allows the system to be safely shut down.

[0011] Preferably, the charging control circuit includes a current-limiting resistor and a charging IC to prevent excessive surge current to the supercapacitor from affecting the stability of the main power supply. The low voltage signal output by the voltage monitoring circuit is not only used to indicate that the power is depleted, but can also be used as a "data saving complete" flag signal to feed back to the power management logic, so that the system can enter a complete shutdown state after the data is safely written, avoiding the complete depletion of the backup power.

[0012] Preferably, the data storage module includes a status information recording unit for temporarily storing the currently acquired real-time video data, for recording the position, flight attitude and timestamp of the drone at the moment of power failure, and for writing the cached data into the built-in memory or external memory card. After receiving the power failure trigger signal from the power management module, the module immediately and automatically starts the storage process to save the video data and status data cached at the moment of power failure and the previous few seconds to the storage medium.

[0013] Preferably, the data storage module continues to support video encoding and compression functions for a limited time after a power outage when the backup power supply is available, processing the original video data in the cache. At the same time, the module also includes a data verification mechanism to ensure the integrity and readability of the data written to the storage medium, and sends a storage completion signal to the power management module after all critical data storage tasks are completed, notifying the power management module that the power can be completely cut off.

[0014] Preferably, the video encoding and compression functions are completed by the hardware encoder on the PTZ main processor under the support of backup power, thereby maximizing the retention time of effective data within a limited backup time. The data verification mechanism refers to reading and verifying or calculating the cyclic redundancy check code immediately after the data is written, and storing the verification information together in the storage medium. This allows the extent of data corruption to be identified even in extreme cases (such as when the power is completely exhausted during the storage process), thereby improving the success rate of data recovery in the later stage.

[0015] Preferably, the system also includes a gimbal attitude control and maintenance unit, which is directly powered by a backup power supply unit. Its function is to maintain the basic attitude stability control loop of the gimbal by continuing to provide power to the gimbal motor driver and attitude sensor during the period when the main power supply is interrupted and the backup power supply is discharging.

[0016] Preferably, the gimbal attitude control and maintenance unit prioritizes power supply to the drive circuit of the gimbal brushless motor and the gyroscope sensor, enabling the gimbal to enter a "attitude hold" or "gradual descent" safety mode during a brief power outage, rather than immediately locking up or losing control. This is to prevent the last frame before the power outage and the first frame after power is restored from becoming completely blurry and unusable due to severe lens shaking.

[0017] Preferably, the backup power unit has the capacity to provide the entire gimbal system, including the image sensor, processor, memory, and attitude control motor, with a full-power operating time of no less than 5 seconds, and the specific capacity value of the supercapacitor will be dynamically configured and selected according to the total power consumption of different gimbal models.

[0018] Preferably, the power management module has the ability to identify various abnormal power states, including but not limited to main power undervoltage, output overcurrent, short circuit and physical battery detachment. The module also integrates a communication interface for communicating with the UAV's flight control system and timely reporting the current power status, abnormal alarms and logs of power outage events.

[0019] As a preferred option, the power management module supports different power failure response strategies configured via software. Users can choose to prioritize ensuring the integrity of video data preservation during a power failure, or prioritize allocating more power to maintain the gimbal's stable posture for a longer period of time, depending on the importance of the task.

[0020] Preferably, the system is integrated inside the drone gimbal, and is designed to share a board with the gimbal motherboard or is connected via an interface.

[0021] The beneficial effects of this invention are: 1. This invention enables the immediate activation and seamless switching of the backup power supply in the event of an unexpected power outage of the drone's main power supply, ensuring the continuous and stable operation of the gimbal and its camera equipment for several seconds. This allows for uninterrupted acquisition of critical video data, thereby preventing mission interruption and loss of important image information due to sudden power outages and reliably guaranteeing the integrity of core data.

[0022] 2. After a power outage, the system can not only maintain video acquisition, but also use the backup power supply to briefly maintain the operation of the PTZ motherboard, continue to encode and compress video data, and maintain caching capabilities. This provides a valuable window of time for safely writing critical data into non-volatile memory, preventing data from being damaged or incomplete due to sudden interruption of the processing.

[0023] 3. This invention provides sufficient time and power support to completely and reliably write video data collected briefly after a power outage, as well as key UAV status information (such as GPS location, flight attitude, system timestamp, etc.) into non-volatile storage media such as built-in memory or memory cards, thus preserving mission evidence and on-site information to the greatest extent possible, providing crucial evidence for post-event playback and analysis.

[0024] 4. This system effectively solves the long-standing pain point in the drone industry of instantaneous loss of core mission data (especially gimbal video) due to unexpected power outages (such as collisions, line failures, and battery detachment), and significantly improves the overall reliability and data security of drones when performing critical tasks such as inspection, reconnaissance, mapping, and evidence collection.

[0025] 5. During the moment of power failure and the subsequent brief period of power supply, the system can maintain the basic operation of the gimbal control system, supply power to the gimbal motor and attitude sensor, prevent the gimbal from shaking violently, locking up or falling out of control due to momentary power failure, help maintain the relative stability of the lens field of view, thereby improving the usability and value of video clips acquired under extreme power failure conditions.

[0026] 6. By automatically saving key data in extreme and unexpected situations, this invention greatly reduces the risk and cost of mission failure due to sudden power outages, requiring a lot of time, manpower, and resources for repeated operations, thereby improving the economic benefits and operational efficiency of drone operations.

[0027] 7. This invention demonstrates the intelligence and adaptability of the unmanned aerial vehicle (UAV) system in responding to sudden failures. Through the synergy between rapid hardware response and software logic, it enhances the robustness and survivability of the entire UAV platform in complex, harsh, or unpredictable environments.

[0028] 8. The system typically includes a dedicated backup power supply (such as a supercapacitor) and an intelligent power management module. It is compact, small in size, and lightweight, making it easy to integrate as a standalone module or into the motherboard of an existing drone equipped with a stabilization gimbal. It does not require large-scale structural or electrical modifications to the drone body and offers good integration convenience.

[0029] 9. This system is particularly suitable for demanding application scenarios with extremely high requirements for data continuity and integrity (such as law enforcement evidence collection, accident investigation, power line inspection, and disaster assessment), ensuring that high-value information during critical periods can be acquired and preserved even in the worst case of main power outage, meeting the extreme requirements of professional fields for the reliability of UAV missions. Attached Figure Description

[0030] Figure 1 The diagram shown is a schematic representation of the system framework of the present invention. Figure 2 The diagram shown illustrates the workflow of this invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1This invention provides an embodiment of a power-off video retention system for a drone gimbal: This system is a highly integrated and rapidly responding independent system embedded within the drone gimbal. It monitors the main power supply status in real time through circuitry. Once an anomaly is detected, it immediately triggers a millisecond-level seamless switch to a supercapacitor-based backup power supply, providing a brief but crucial continuous power supply to the gimbal system. Simultaneously, the embedded data storage module on the gimbal motherboard is activated. Utilizing these precious few seconds, it systematically completes the final processing of cached video data, records key status information, and securely writes all data to non-volatile memory, thereby maximizing the continuity and integrity of the data.

[0033] Furthermore, the power status detection circuit will be explained as follows: This circuit continuously samples the voltage and current of the drone's main power supply. It consists of a high-precision, low-drift voltage divider network and a high-speed comparator circuit. The voltage divider network scales down the main power supply voltage (e.g., 22.2V) to a range that the comparator can recognize (e.g., 3.3V). One input of the comparator is connected to the scaled voltage, and the other input is connected to a threshold voltage generated by a precision reference source (e.g., 3.0V corresponding to undervoltage of the main power supply). Once the main power supply voltage drops below the threshold due to a fault, the comparator's output level will instantly flip, generating a hardware power-off interrupt signal. Similarly, the total current can be monitored through sampling resistors and operational amplifiers to achieve overcurrent and short-circuit detection. This pure hardware implementation has a response time in the microsecond range, which is much faster than any software implementation.

[0034] Furthermore, the switching control circuit will be explained as follows: This circuit receives a power failure interrupt signal from the comparator and controls the switching between the main power supply and the backup power supply. By using a pair of back-to-back P-MOSFETs or a dedicated ideal diode controller chip, the main power supply path is turned on during normal power supply, the supercapacitor is in a charging state, and the main power supply supplies power to the load. When the power failure interrupt signal arrives, the control circuit will turn off the main power supply path MOSFET very quickly (usually within tens of microseconds) and simultaneously turn on the backup power supply path MOSFET completely, so that the supercapacitor's power is seamlessly injected into the system power bus. The entire switching process is required to be as smooth as possible to avoid large voltage drops or glitches on the system power bus, which could cause the gimbal processor to reset.

[0035] Furthermore, the supercapacitor management unit will be explained as follows: This unit uses a constant current / constant voltage charging management IC to manage the charging of the supercapacitor. The charging current and termination voltage must be carefully set according to the specifications of the selected supercapacitor to prevent overcharging damage. The charging circuit usually includes current-limiting resistors and voltage regulators to ensure that the supercapacitor can be stably and safely maintained at full charge when the main power supply is normal, ready to be put into operation at any time.

[0036] During the discharge phase, the voltage of the supercapacitor continuously decreases. An ADC or another comparator circuit continuously monitors the voltage across the supercapacitor. The system has two critical voltage thresholds. The first threshold is the minimum voltage required to maintain the normal operation of the gimbal system, and the second, lower threshold is the protection voltage at which the system must terminate operation and shut down to prevent damage from over-discharge of the supercapacitor. When the voltage drops to the first threshold, the unit sends a warning signal to the data storage module; when the voltage drops to the second threshold, it sends a final shutdown signal and controls the discharge circuit to completely disconnect, protecting the supercapacitor.

[0037] Furthermore, the backup power unit will be explained as follows: This invention uses a supercapacitor bank instead of a traditional lithium battery as a backup power source. Supercapacitors have a lifespan of millions of charge-discharge cycles, extremely fast charge-discharge speed, a wider operating temperature range, and higher safety.

[0038] The capacity and operating voltage range of the supercapacitor are key parameters. During implementation, a precise energy budget is required. First, calculate the total power P or total current I of all loads requiring power after a power outage (gimbal SOC, camera sensor, SD card, motor driver standby power consumption, etc.). Then, determine the required operating time T of the system, for example, 5 seconds, and the energy required. The energy stored in supercapacitors Where C is the capacitance value, This is the initial voltage (full charge voltage). The minimum voltage at which the system can operate is given. The required capacitance C value can be calculated from this formula. Typically, multiple supercapacitors are connected in series (to increase the operating voltage) and in parallel (to increase the capacity) to form a capacitor bank to meet the voltage and energy requirements.

[0039] Furthermore, the data storage module will be explained as follows: When the system is working normally, the DRAM of the gimbal's main processor will open up an independent circular buffer to continuously store the latest video data being processed or encoded (data 3-5 seconds before power failure). This buffer is protected by software and will not be overwritten by regular tasks. Its size is calculated based on the video bitrate and the length of time that needs to be backtracked.

[0040] The status information recording unit of this module periodically receives the UAV's status information (latitude, longitude, altitude, attitude angle and speed, etc.) from the flight control system via serial port or CAN bus through DMA, and writes it into a dedicated buffer area. At the same time, the system timestamps each frame of video data.

[0041] The power outage of this module specifically includes: The gimbal's main processor receives a "power-off trigger" signal from the power management module via a high-priority hardware interrupt pin. This signal immediately triggers an interrupt service routine to take over system control. First, it saves the processor's current critical operating state. Then, the main program exits the regular task loop and enters an emergency save routine. This routine immediately stops writing new data to the video frame circular buffer in DRAM and locks its start and end pointers, thus freezing the precious video data of the moment of power failure and the previously predetermined few seconds. Next, the system calls a hardware encoder to quickly encode and encapsulate the remaining raw video data or incomplete bitstream in the buffer into standard video file segments. Simultaneously, it records the latest critical UAV status information (such as GPS position, attitude, and time) cached in the status information recording unit. The data storage module generates an independent log file or embeds video metadata using a high-speed storage interface (such as SDIO). Then, it securely writes the final video file segments and log file to non-volatile memory. After writing, it can optionally perform a refresh operation to force the data in the operating system cache to be written to the physical medium. Cyclic redundancy check can be performed to ensure data integrity and readability. After all critical data saving tasks are confirmed, the data saving module sends a "save complete" signal to the power management module. Finally, the processor enters a low-power sleep state or shuts down completely, waiting for the power management module to cut off all power supply based on the signal and the supercapacitor voltage status, thus completing the entire power failure response and data preservation process.

[0042] Furthermore, the gimbal attitude control and maintenance unit will be explained as follows: On the software side, a high-priority task is set in the power-off preservation firmware to continuously read attitude data from the inertial measurement unit after power failure and run a PID control algorithm to calculate the motor control quantities required to maintain the current attitude or slowly tilt downwards. On the hardware side, the backup power supply must be able to power the gimbal's IMU sensors and brushless motor driver board. After receiving the control signal from the processor, the motor driver board continues to drive the motor with reduced power consumption to generate sufficient torque to counteract gimbal jitter and its own weight, achieving a "soft landing" rather than a "free fall".

[0043] Please see Figure 2 This invention provides an embodiment, which uses the example of a drone undergoing power line inspection suddenly experiencing a loose battery interface leading to a main power outage, to illustrate its system workflow: The drone, equipped with this invention, can film high-voltage lines. With the main power supply normal and the supercapacitor fully charged, video data is continuously written to the DRAM cache. At the same time, key status information of the drone, such as GPS latitude and longitude, flight altitude, attitude angle, and system timestamp, is continuously acquired and recorded in a dedicated cache area through the communication interface. Meanwhile, the power management module continuously monitors the voltage and current parameters of the main power supply.

[0044] During the inspection, the battery interface became physically loose or momentarily disconnected due to continuous vibration of the machine body. The impedance of the main power circuit increased sharply, and the output voltage dropped drastically. This abnormal situation exceeded the normal operating voltage range and constituted a "sudden power outage" event that triggered the system response.

[0045] Within 100 microseconds, the voltage comparator of the power management module detects that the main power supply voltage has dropped below the undervoltage threshold. Its output level then flips, generating a high-priority hardware power-off interrupt signal. This signal is immediately sent to the switching control circuit, which drives its internal MOSFET array to quickly cut off the main power supply path within milliseconds. At the same time, it fully connects the backup power supply path, so that the electrical energy stored in the supercapacitor bank is immediately injected into the power bus of the gimbal system, thereby achieving seamless power supply capability.

[0046] The interrupt signal simultaneously triggers a hardware interrupt in the PTZ processor. The processor immediately interrupts the current video encoding task, suspends all currently executing routine tasks (such as video encoding, image enhancement, communication transmission, etc.), saves the CPU context urgently, and then jumps to execute the interrupt service routine.

[0047] The emergency procedure of the data storage module first locks the DRAM, stops new data overwriting, and quickly encapsulates the video data cached in the DRAM 5 seconds before the power failure. At the same time, it writes the last GPS positioning, attitude and timestamp information to the log file, and then writes all the data to the SD card. Meanwhile, the system reduces the video processing frequency and uses more resources for data storage.

[0048] Throughout the process, the gimbal attitude control and maintenance unit continued to function, and the backup power supply provided the necessary power to the gimbal's brushless motor drive board and inertial measurement unit. Based on the final command, the attitude was maintained, and the camera image remained stable without any violent shaking or drop.

[0049] Approximately 4 seconds later, the data was saved and a "save complete" signal was issued. At this point, the supercapacitor voltage had dropped to the predetermined safety threshold, and the power management module completely shut down the power supply of the entire PTZ system.

[0050] After the inspection team retrieved the drone, they successfully recovered a complete video from the SD card. The video ended with clear footage of the circuit before and after the power outage, along with location information. This successfully identified the fault and prevented the inspection mission from completely failing.

[0051] This invention provides an embodiment, which is illustrated using a nighttime security evidence collection scenario as an example: In this embodiment, when a drone equipped with the power failure retention system described in this invention is performing a patrol mission at night, its main battery experiences a sudden drop in output voltage due to rapid performance degradation caused by long-term aging. The hardware detection circuit of the system's power management module identifies this undervoltage anomaly within microseconds and immediately triggers the fast switching control circuit to disconnect the faulty main power supply path and simultaneously seamlessly connect the backup power unit composed of supercapacitors. This ensures uninterrupted power supply to the gimbal system's power bus. Within the precious few seconds of power supply provided by the backup power supply, the data storage module on the gimbal motherboard is efficiently triggered. First, it keeps the infrared thermal imager sensor and image processor working, continuously acquiring the on-site thermal imaging video stream, while simultaneously cutting off power. The critical video data, including the moment and the following few seconds, was locked from the buffer and the embedded processor's encoding and storage resources were utilized. This video data was then integrated with the drone's last known GPS coordinates, gimbal lens pointing azimuth angle, attitude angle, and high-precision timestamps obtained in real time by the flight control system. Finally, the data was reliably and completely written into the onboard non-volatile memory. After the entire process was completed, the system automatically and safely shut down. Subsequently, law enforcement personnel successfully recovered the critical video and data evidence, which recorded the suspect's thermal signal, escape direction, and final location, from the memory. This provided crucial information support for solving the case and fully demonstrated the system's ability to ensure the integrity and availability of evidence data in the event of a sudden power failure.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A power-off video retention system for a drone gimbal, characterized in that, Including: The PTZ mainboard is used to process, encode, and store video or infrared signals captured by the PTZ. The power management module is used to monitor the status of the main power supply and trigger the switching of the backup power supply when an abnormal power outage or undervoltage abnormality is detected. The backup power unit, consisting of a supercapacitor or a small-capacity backup battery, is used to provide temporary power support for the gimbal motherboard after the main power is interrupted. The data storage module, which communicates with the power management module, is integrated into the embedded processing unit of the PTZ motherboard. It is used to automatically save the current video stream data, cached data, and key status information when a power failure event is triggered.

2. The power-off video retention system for a drone gimbal according to claim 1, characterized in that: The power management module includes a power status detection circuit for real-time monitoring of the main power supply voltage and current status, a switching control circuit for automatically and quickly switching to the backup power supply when the main power supply is abnormal, and a supercapacitor management unit for charging and discharging control and status monitoring of the supercapacitor. The entire power management module responds quickly through optimized hardware circuit design, and the entire process from detecting an abnormality to completing the power switching takes less than 10 milliseconds.

3. The power-off video retention system for a drone gimbal according to claim 2, characterized in that: The supercapacitor management unit includes a charging control circuit for constant current or constant voltage charging of the supercapacitor when the main power supply is normal, a discharge control circuit for controlling the supercapacitor to discharge to the gimbal motherboard when the main power supply is interrupted, and a voltage monitoring circuit for real-time monitoring of the voltage across the supercapacitor. When the voltage of the supercapacitor drops to a preset threshold voltage due to discharge, the voltage monitoring circuit sends a signal to the data storage module to indicate that the available energy is about to be exhausted, which triggers the data storage completion sequence and ultimately allows the system to shut down safely.

4. The power-off video retention system for a drone gimbal according to claim 1, characterized in that: The data storage module includes a status information recording unit for temporarily storing the currently acquired real-time video data, for recording the drone's position, flight attitude and timestamp at the moment of power failure, and for writing cached data to the built-in memory or external memory card. After receiving a power failure trigger signal from the power management module, the module immediately and automatically starts the storage process, saving the video data and status data cached at the moment of power failure and the previous few seconds to the storage medium.

5. The power-off video retention system for a drone gimbal according to claim 4, characterized in that: The data storage module continues to support video encoding and compression functions for a limited time after a power outage when the backup power supply is available, processing the original video data in the cache. At the same time, the module also includes a data verification mechanism to verify the data written to the storage medium, and sends a signal to the power management module indicating that the power can be completely cut off after all critical data storage tasks are completed.

6. The power-off video retention system for a drone gimbal according to claim 1, characterized in that: The system also includes a gimbal attitude control and maintenance unit, which is directly powered by a backup power supply unit. Its function is to maintain the basic attitude stability control loop of the gimbal by continuing to provide power to the gimbal motor driver and attitude sensor during the period when the main power supply is interrupted and the backup power supply is discharging.

7. The power-off video retention system for a drone gimbal according to claim 1, characterized in that: The backup power unit has the capacity to provide the entire gimbal system, including the image sensor, processor, memory, and attitude control motor, with a full-power operating time of no less than 5 seconds. The specific capacity of the supercapacitor will be dynamically configured and selected according to the total power consumption of different gimbal models.

8. The power-off video retention system for a drone gimbal according to claim 1, characterized in that: The power management module is capable of identifying various abnormal power states, including but not limited to main power undervoltage, output overcurrent, short circuit and physical battery detachment. The module also integrates a communication interface for communicating with the UAV's flight control system and promptly reporting the current power status, abnormal alarms and logs of power outage events.

9. A power-off video retention system for a drone gimbal according to claim 8, characterized in that: The power management module supports different power failure response strategies configured via software. Users can choose to prioritize ensuring the integrity of video data preservation during a power failure, or prioritize allocating more power to maintain the stability of the PTZ for a longer period of time, depending on the importance of the task.

10. A power-off video retention system for a drone gimbal according to claim 1, characterized in that: The system is integrated inside the drone gimbal and is either designed on the same board as the gimbal motherboard or connected via an interface.

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