A backup power management system for a tethered drone cable retracting device

Abstract

The present invention discloses a backup power management system for a tethered drone cable retracting device, which relates to the technical field of tethered drones, has an active capacitor voltage balancing function, solves the problem of unstable output voltage caused by increasing the voltage of a series supercapacitor by means of energy transfer, and prevents the backup power supply from overvoltage during the charging process. At the same time, it integrates protection and monitoring functions, including short circuit, overheating and other functions, effectively reduces the loss of electrical equipment, improves the efficiency of electric energy utilization, and reduces costs and increases efficiency. At the same time, a power resistor R66 is added to the output end of the supercapacitor management circuit to limit the current of the charging, an anti-reverse injection diode D3 is added to prevent the voltage at the supercapacitor end from being reversed to the input end of the charging chip, and capacitors C73 / C74 / C75 / C76 are added to provide electromagnetic compatibility protection functions, thereby ensuring the reliability and stability of the circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of tethered unmanned aerial vehicles, and in particular to a backup power management system for a cable retracting and releasing device of a tethered unmanned aerial vehicle. Background Art

[0002] The tethered drone system consists of a tethered drone, a tethered cable retracting device, a power converter, and a control terminal. The advantage of a tethered drone over an ordinary multi-rotor drone is that the power supply method is changed from an onboard lithium battery to a direct ground power supply. During the flight, the drone and ground equipment transmit data and power through the tethered cable, solving the problem of drone endurance.

[0003] The cables of tethered drones are usually retracted and released using a tethered cable retraction and release device. In actual applications, the tethered cable retraction and release device is not only responsible for the retraction and release of the cable, but also integrates status monitoring and communication modules to provide real-time feedback on its own operating status, thereby achieving the overall controllability and knowledgeability of the tethered drone system.

[0004] In the prior art, the tethered cable retracting device generally uses a supercapacitor to provide a backup power supply to ensure the normal operation of the RTK, optical terminal and other boards in the tethered cable retracting device of the drone, and to ensure the information exchange between the drone and the ground station.

[0005] However, the low working voltage of supercapacitors, usually between 2V and 3V, limits the application range of supercapacitors. At the same time, the capacitance value of supercapacitors is unstable and easily affected by temperature, service life and other factors, which will cause certain fluctuations and limit their output accuracy. Summary of the invention

[0006] In view of the above problems, the present invention provides a backup power management system for a tethered drone cable retracting and releasing device for overcoming the above problems or at least partially solving the above problems.

[0007] The present invention provides the following scheme:

[0008] A backup power management system for a tethered drone cable retracting and releasing device, comprising:

[0009] A charging configuration circuit, a supercapacitor management circuit, a supercapacitor group, a CAN communication circuit and a first power conversion circuit; the charging configuration circuit is respectively connected to the power module and the supercapacitor management circuit, the supercapacitor group is respectively connected to the supercapacitor management circuit and the first power conversion circuit, and the CAN communication circuit is respectively connected to the supercapacitor management circuit and the supercapacitor group; the supercapacitor group includes a plurality of supercapacitors connected in series;

[0010] The charging configuration circuit is used to configure the input current provided by the power module to the charging voltage and charging current required by the plurality of supercapacitors;

[0011] The supercapacitor management circuit is used to implement a health status monitoring function and a protection monitoring function for each supercapacitor according to the status information of each supercapacitor reported by the CAN communication circuit;

[0012] The first power conversion circuit is used to convert the voltage of the output current of the supercapacitor group to adapt to the voltage of the current required by the board in the cable box of the tethered drone;

[0013] Among them, the output end of the supercapacitor management circuit is provided with an anti-backflow diode D3 and a power resistor R66. The anti-backflow diode D3 is used to prevent the supercapacitor end voltage from backflowing to the input end of the manager U5, and the power resistor R66 is used to limit the charging current to ensure that the individual capacitor monitoring and balancing functions remain normal.

[0014] Preferably: the content of the health status monitoring includes at least the operating status, charging status, and health status; the content of the protection monitoring includes at least overvoltage protection, short circuit protection, and overheating protection.

[0015] Preferably: the output end of the supercapacitor management circuit is connected to a field effect transistor Q1 and a photocoupler U4 for signal isolation, level conversion and circuit protection; the power resistor R66 is connected to both ends of the field effect transistor Q1 in parallel.

[0016] Preferably: the VCC of the supercapacitor management circuit is connected to the positive electrode of the first supercapacitor CAP1, the positive electrode of the first supercapacitor CAP1 is connected to the drain of the field effect tube Q4, the negative electrode of the first supercapacitor CAP1 is connected to the resistor R29 and the positive electrode of the next supercapacitor CAP2, the other end of the resistor R29 is connected to the source of the field effect tube Q4, the gate of the field effect tube Q4 is connected to the VC pin of the manager, and a voltage balancing circuit is formed by the resistor R22, the resistor R29 and the capacitor C33; the positive electrode of the first supercapacitor CAP1 is connected to the drain of the field effect tube Q4, the negative electrode of the first supercapacitor CAP1 is connected to the resistor R29 and the positive electrode of the next supercapacitor CAP2, the other end of the resistor R29 is connected to the source of the field effect tube Q4, the gate of the field effect tube Q4 is connected to the VC pin of the manager, and the resistor R22, the resistor R29 and the capacitor C33 form a voltage balancing circuit ... drain of the field effect tube Q4, the negative electrode of the first supercapacitor CAP1 is connected to the drain of the field effect tube Q4, the negative electrode of the first supercapacitor CAP1 is The diode D1 is connected to a resistor R18, the other end of the resistor R18 is connected to a transistor Q2, the manager controls the on / off of the transistor Q2 through the REG27 pin, the other end of the transistor Q2 is connected to a resistor R20 and a resistor R21 connected in parallel, the other end of each of the resistors R20 and R21 is connected to the drain of the field effect transistor Q3, the gate of the field effect transistor Q3 is connected to the LLEN pin of the manager, the manager measures the supercapacitor equivalent series resistance and related parameters through the LLEN pin, and the source of the field effect transistor Q3 is grounded.

[0017] Preferably: the supercapacitor management circuit further includes a voltage and current monitoring circuit composed of a capacitor C41, a capacitor C42, a capacitor C43, a resistor R33, a resistor R34, and a resistor R41, for monitoring the available capacitance, health status, voltage, and current of the supercapacitor;

[0018] The TS pin of the manager is connected to the thermistor RT1 for monitoring the temperature parameters of the supercapacitor;

[0019] The SCL pin of the manager is connected to a resistor R23 and a resistor R24 ​​connected in series, a capacitor C34 is connected between the resistor R23 and the resistor R24, and the capacitor C34 is grounded to form a clock synchronization circuit;

[0020] The FAULT pin of the manager is connected to a resistor R25 and a resistor R26 connected in series, a capacitor C35 is connected between the resistor R25 and the resistor R26, and the capacitor C35 is grounded to serve as a fault indication;

[0021] The SDA pin of the manager is connected to resistors R27 and R28 connected in series, a capacitor C36 is connected between the resistors R27 and R28, and the capacitor C36 is grounded to play a role in data communication;

[0022] The CHGOR pin of the manager is grounded to act as an overvoltage protection.

[0023] Preferably: the input end of the CAN communication circuit includes a first filter circuit composed of a magnetic bead FB2, a capacitor C10, and a capacitor C11, and the output end of the CAN communication circuit includes a second filter circuit composed of a capacitor C6, a capacitor C7, and a capacitor C8.

[0024] Preferably: the CAN communication circuit further comprises an anti-interference circuit formed by matching capacitors C4 and C5 with a terminal resistor R1, and the anti-interference circuit is used to optimize the transmission quality and anti-interference capability of the CAN communication circuit.

[0025] Preferably: the input end of the charging configuration circuit is externally connected to a capacitor C37 and a capacitor C38, and the capacitor C37 and the capacitor C38 are used to reduce ripples and perform high-frequency filtering and anti-interference; the resistor R31, the resistor R37, the resistor R39 and the capacitor C40 form a voltage-dividing resistor network for monitoring the output voltage; the resistor R32, the capacitor C48, the capacitor C47 and the inductor L1 play the role of output filtering to ensure the stability of the output voltage.

[0026] Preferably: the VIN pin of the synchronous buck converter of the first power conversion circuit is externally connected to capacitor C53 and capacitor C54, and the capacitor C53 and the capacitor C54 are used to reduce ripple and perform high-frequency filtering and anti-interference; resistor R47, resistor R53 and capacitor C58 constitute a voltage-dividing resistor network for monitoring the output; resistor R44 and resistor R49 control enable, capacitor C51 is used to provide a driving voltage for the high field effect transistor, and inductor L3 and capacitor C60, capacitor C61 and capacitor C62 constitute a filtering circuit.

[0027] Preferably: it also includes a second power conversion circuit, a power chip and a microcontroller, the second power conversion circuit is connected to the power module and the power chip respectively, and the power chip is connected to the microcontroller;

[0028] The second power conversion circuit is used to adjust the voltage of the current input by the power module to a voltage adapted by the power chip and a voltage adapted to the current required by the board in the tethered drone cable box. The power chip is used to adjust the current voltage to a voltage adapted by the microcontroller.

[0029] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0030] The embodiment of the present application provides a backup power management system for a tethered drone cable retraction and deployment device, which has an active capacitor voltage balancing function. It solves the problem of unstable output voltage caused by increasing the voltage of series supercapacitors through energy transfer, and prevents overvoltage from occurring in the backup power supply during the charging process. At the same time, it integrates protection and monitoring functions, including short circuit and overheating functions, effectively reducing the loss of electrical equipment, improving the efficiency of power utilization, and reducing costs and increasing efficiency.

[0031] At the same time, a power resistor R66 is added at the output end of the supercapacitor management circuit to limit the charging current, an anti-backflow diode D3 is added to prevent the supercapacitor end voltage from backflowing to the charging chip input end, and capacitors C73 / C74 / C75 / C76 are added to provide electromagnetic compatibility protection function to ensure the reliability and stability of the circuit.

[0032] In addition, it provides a capacitor health status monitoring function, including operating status, charging status, health status, etc., and can report the voltage, charging voltage, charging current and other status information of a single capacitor through CAN communication, ensuring the stability of supercapacitor charging and discharging, and ensuring the stability and reliability of information exchange between the ground and the drone in the event of abnormal power supply of the tethered cable retraction device.

[0033] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 This is a principle block diagram of a backup power management system for a tethered drone cable retracting device provided by an embodiment of the present invention;

[0036] Figure 2 Is a circuit diagram of a supercapacitor management circuit provided in an embodiment of the present invention;

[0037] Figure 3 is a pin diagram of the manager U5 provided in an embodiment of the present invention;

[0038] Figure 4 Is a circuit diagram of a CAN communication circuit provided by an embodiment of the present invention;

[0039] Figure 5 Is a circuit diagram of a charging configuration circuit provided in an embodiment of the present invention;

[0040] Figure 6 It is a circuit schematic diagram of a first power conversion circuit provided in an embodiment of the present invention.

[0041] In the figure: power module 1, charging configuration circuit 2, super capacitor management circuit 3, super capacitor group 4, CAN communication circuit 5, first power conversion circuit 6, second power conversion circuit 7, power chip 8, microcontroller 9. DETAILED DESCRIPTION

[0042] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0043] See also Figure 1 , is a backup power management system for a tethered drone cable retracting device provided by an embodiment of the present invention, such as Figure 1 As shown, the system may include:

[0044] A charging configuration circuit 2, a supercapacitor management circuit 3, a supercapacitor group 4, a CAN communication circuit 5 and a first power conversion circuit 6; the charging configuration circuit 2 is respectively connected to the power module 1 and the supercapacitor management circuit 3, the supercapacitor group 4 is respectively connected to the supercapacitor management circuit 3 and the first power conversion circuit 6, and the CAN communication circuit 5 is respectively connected to the supercapacitor management circuit 3 and the supercapacitor group 4; the supercapacitor group 4 includes a plurality of supercapacitors connected in series;

[0045] The charging configuration circuit 2 is used to configure the input current provided by the power module 1 to the charging voltage and charging current required by the supercapacitors;

[0046] The supercapacitor management circuit 3 is used to implement a health status monitoring function and a protection monitoring function for each supercapacitor according to the status information of each supercapacitor reported by the CAN communication circuit 5;

[0047] The first power conversion circuit 6 is used to convert the voltage of the output current of the super capacitor group 4 to adapt to the voltage of the current required by the board in the cable box of the tethered drone;

[0048] Among them, the output end of the supercapacitor management circuit 3 is provided with an anti-backflow diode D3 and a power resistor R66, the anti-backflow diode D3 is used to prevent the supercapacitor terminal voltage from backflowing to the input end of the manager U5, and the power resistor R66 is used to limit the charging current to ensure that the individual capacitor monitoring and balancing functions remain normal. In specific implementation, the embodiment of the present application can provide that the content of the health status monitoring includes at least the operating status, charging status, and health status; the content of the protection monitoring includes at least overvoltage protection, short circuit protection, and overheating protection.

[0049] The backup power management system for the cable retracting device of the tethered drone provided by the present application, the supercapacitor group 4 provides multiple supercapacitors connected in series, so that the supercapacitor group 4 can provide a higher working voltage, expanding the use range of the supercapacitor. Through the provided CAN communication circuit 5, the supercapacitor board can report the voltage and charging voltage, charging current and other status information of a single capacitor through CAN communication.

[0050] The supercapacitor management circuit 3 provides a capacitor health status monitoring function based on the capacitor status information reported by the CAN communication circuit 5, including operating status, charging status, health status, etc., and integrates protection monitoring functions, including overvoltage, short circuit, overheating, etc., and ultimately plays the role of independent capacitor monitoring and balancing, effectively reducing the loss of electrical equipment, improving the efficiency of power utilization, and playing a role in reducing costs and increasing efficiency.

[0051] Add anti-backflow diode D3 at the output end of supercapacitor management circuit 3 to prevent the voltage at the supercapacitor end from backflowing to the input end of the charging chip (manager). At the same time, add power resistor R66 at the output end of supercapacitor management circuit 3 to limit the charging current and ensure the normal function of individual capacitor monitoring and balancing. In addition, Y capacitors C73 / C74 / C75 / C76 can be added to the power module 1 to provide electromagnetic compatibility protection function.

[0052] The supercapacitor management circuit 3 provided in the embodiment of the present application includes a manager U5 for implementing logical management, and the capacitor status information reported by the CAN communication circuit 5 provides a capacitor health status monitoring function and a protection monitoring function to ensure that when multiple supercapacitors are set, the capacitor charging safety can be guaranteed and the supercapacitor remains stable, thereby improving the output accuracy. In specific implementation, the embodiment of the present application can provide that the output end of the supercapacitor management circuit 3 is connected to a field effect transistor Q1 and a photocoupler U4 to perform signal isolation, level conversion and circuit protection on the circuit; the power resistor R66 is connected to both ends of the field effect transistor Q1 in parallel.

[0053] Furthermore, the VCC of the supercapacitor management circuit 3 is connected to the positive electrode of the first supercapacitor CAP1, the positive electrode of the first supercapacitor CAP1 is connected to the drain of the field effect tube Q4, the negative electrode of the first supercapacitor CAP1 is connected to the resistor R29 and the positive electrode of the next supercapacitor CAP2, the other end of the resistor R29 is connected to the source of the field effect tube Q4, the gate of the field effect tube Q4 is connected to the VC pin of the manager, and a voltage balancing circuit is formed by resistor R22, resistor R29 and capacitor C33; the positive electrode of the first supercapacitor CAP1 is connected Diode D1, the diode D1 is connected to a resistor R18, the other end of the resistor R18 is connected to a transistor Q2, the manager controls the on and off of the transistor Q2 through the REG27 pin, the other end of the transistor Q2 is connected to a resistor R20 and a resistor R21 in parallel, the other end of each of the resistors R20 and R21 is connected to the drain of the field effect transistor Q3, the gate of the field effect transistor Q3 is connected to the LLEN pin of the manager, the manager measures the supercapacitor equivalent series resistance and related parameters through the LLEN pin, and the source of the field effect transistor Q3 is grounded.

[0054] Furthermore, the supercapacitor management circuit 3 also includes a voltage and current monitoring circuit composed of a capacitor C41, a capacitor C42, a capacitor C43, a resistor R33, a resistor R34, and a resistor R41, which is used to monitor the available capacitance, health status, voltage, and current of the supercapacitor;

[0055] The TS pin of the manager U5 is connected to the thermistor RT1 for monitoring the temperature parameters of the supercapacitor;

[0056] The SCL pin of the manager U5 is connected to a resistor R23 and a resistor R24 ​​connected in series, a capacitor C34 is connected between the resistor R23 and the resistor R24, and the capacitor C34 is grounded to form a clock synchronization circuit;

[0057] The FAULT pin of the manager U5 is connected to a resistor R25 and a resistor R26 connected in series, a capacitor C35 is connected between the resistor R25 and the resistor R26, and the capacitor C35 is grounded to serve as a fault indication;

[0058] The SDA pin of the manager U5 is connected to a resistor R27 and a resistor R28 connected in series, a capacitor C36 is connected between the resistor R27 and the resistor R28, and the capacitor C36 is grounded to play a role in data communication;

[0059] The CHGOR pin of the manager U5 is grounded to provide overvoltage protection.

[0060] The CAN communication circuit 5 provided in the embodiment of the present application is used to send the capacitance status information of each supercapacitor in the supercapacitor group 4 to the supercapacitor management circuit 3. In specific implementation, the embodiment of the present application can provide that the input end of the CAN communication circuit 5 includes a first filtering circuit composed of a magnetic bead FB2, a capacitor C10, and a capacitor C11, and the output end of the CAN communication circuit 5 includes a second filtering circuit composed of a capacitor C6, a capacitor C7, and a capacitor C8.

[0061] In order to further improve the anti-interference capability of the CAN communication circuit 5, the embodiment of the present application may provide that the CAN communication circuit 5 also includes an anti-interference circuit composed of capacitors C4, C5 and terminal resistor R1, and the anti-interference circuit is used to optimize the transmission quality and anti-interference capability of the CAN communication circuit 5.

[0062] The charging configuration circuit 2 provided in the embodiment of the present application is used to configure the current provided by the power module 1 to the voltage required for charging the supercapacitor. In specific implementation, the embodiment of the present application can provide an external capacitor C37 and a capacitor C38 at the input end of the charging configuration circuit 2. The capacitor C37 and the capacitor C38 are used to reduce ripple and perform high-frequency filtering and anti-interference; the resistor R31, the resistor R37, the resistor R39 and the capacitor C40 form a voltage-dividing resistor network for monitoring the output voltage; the resistor R32, the capacitor C48, the capacitor C47, and the inductor L1 play the role of output filtering to ensure the stability of the output voltage.

[0063] The first power conversion circuit 6 provided in the embodiment of the present application is used to convert the voltage of the output current of the supercapacitor group 4 into the voltage of the current required by the board in the cable box of the tethered drone after a main power supply fails, thereby temporarily powering the board in the cable box to ensure that the optical terminal, RTK board and other boards in the cable box can operate stably for 3 minutes, and the necessary data can be transmitted during the landing process to ensure information interaction between the drone and the ground station.

[0064] In specific implementation, the embodiment of the present application can provide an external capacitor C53 and a capacitor C54 at the VIN pin of the synchronous buck converter of the first power conversion circuit 6, and the capacitor C53 and the capacitor C54 are used to reduce ripple and perform high-frequency filtering and anti-interference; resistor R47, resistor R53 and capacitor C58 constitute a voltage divider resistor network for monitoring the output; resistor R44 and resistor R49 control enable, capacitor C51 is used to provide a driving voltage for the high field effect transistor, and inductor L3 and capacitor C60, capacitor C61, and capacitor C62 constitute a filtering circuit.

[0065] In order to realize power supply for the board in the cable box of the tethered drone through the power module 1 in a fault-free state, the embodiment of the present application may further provide a second power conversion circuit 7, a power chip 8 and a microcontroller (GD32) 9, wherein the second power conversion circuit 7 is connected to the power module 1 and the power chip 8 respectively, and the power chip 8 is connected to the microcontroller (GD32) 9;

[0066] The second power conversion circuit 7 is used to adjust the voltage of the current input by the power module 1 to a voltage adapted by the power chip 8 and a voltage adapted to the current required by the board in the tethered drone cable box. The power chip 8 is used to adjust the current voltage to a voltage adapted by the microcontroller (GD32) 9.

[0067] In the normal state without any fault, the current provided by the power module 1 can be converted by the second power conversion circuit 7 to power the boards in the tethered drone cable box, as well as the power chip 8 and the microcontroller (GD32) 9. When the power supply path fails, the supercapacitor group 4 can be used to temporarily power the boards in the tethered drone cable box.

[0068] Taking the supercapacitor group 4 including 5 supercapacitors as an example, the mechanical energy of the backup power management system for the tethered drone cable retracting device provided in the embodiment of the present application is described in detail.

[0069] The system provided in the embodiment of the present application adopts the method of controlling the supercapacitor to charge by the main control chip, and uploads the status information of the board through the CAN bus. In the case of abnormal power supply of the system, the supercapacitor provides backup power for the board in the cable box, ensuring that the optical terminal, RTK board and other boards in the cable box can run stably for 3 minutes, and the necessary data can be transmitted during the landing process to ensure the information interaction between the drone and the ground station.

[0070] The power input DC48V provides DC24V power to the board through the 48V to 24V power module 1. At the same time, four YC73 / C74 / C75 / C76 capacitors can be added to the power module 1 to provide electromagnetic compatibility protection function; the DC24V current charges the supercapacitor through the microelectronic chip (supercapacitor management circuit 3), and the chip provides current limiting function; the microelectronic chip provides DC5V power to the board to ensure the transmission of real-time status information.

[0071] The system may include a power module 1, a charging configuration circuit 2, a supercapacitor management circuit 3, a supercapacitor group 4, a CAN communication circuit 5, a first power conversion circuit 6, a second power conversion circuit 7, a power chip 8 and a microcontroller 9. The circuit principle block diagram is shown in FIG. Figure 1 shown.

[0072] Among them, the supercapacitor management circuit 3 is as follows Figure 2 , Figure 3 As shown, the circuit provides a capacitor health status monitoring function according to the capacitor status information reported by the CAN communication circuit 5, including operating status, charging status, health status, etc., and integrates protection monitoring functions, including overvoltage, short circuit, overheating, etc., and finally plays the role of independent capacitor monitoring and balancing. The manager can exist in chip form.

[0073] The supercapacitor management circuit 3 is connected to the five supercapacitors in series included in the supercapacitor group 4, and the five supercapacitors include CAP1, CAP2, CAP3, CAP4, and CAP5. The output end of the supercapacitor management circuit 3 is connected to the field effect tube Q1 and the photocoupler U4 to perform signal isolation, level conversion, and protection circuit on the circuit, and at the same time, the power resistor R66 is added to limit the charging current, VCC is connected to the positive electrode of the first supercapacitor CAP1, the positive electrode of the first supercapacitor CAP1 is connected to the drain of the field effect tube Q4, the negative electrode of the first supercapacitor CAP1 is connected to the resistor R29, the other end of the resistor R29 is connected to the source of the field effect tube Q4, and the gate of the field effect tube Q4 is connected to the VC pin of the supercapacitor manager. At the same time, the resistor R22, the resistor R29, and the capacitor C33 form a voltage balancing circuit, and the negative electrode of the supercapacitor CAP1 is connected to the positive electrode of the next supercapacitor CAP2. The circuit structure of the next supercapacitor CAP2 is similar to that of the supercapacitor CAP1, and its negative electrode is connected to the next supercapacitor CAP3 until the supercapacitor CAP5.

[0074] The positive pole of the first super capacitor CAP1 is connected to the diode D1, and the diode D1 is connected to the resistor R18. The other end of the resistor R18 is connected to the transistor Q2. The manager U5 controls the on and off of the transistor Q2 through the REG27 pin. The other end of the transistor Q2 is connected to two parallel resistors R20 and R21. The other end of the resistor is connected to the drain of the field effect transistor Q3. The gate of the field effect transistor Q3 is connected to the LLEN pin of the chip (manager U5). The chip (manager U5) measures the super capacitor equivalent series resistance and other related parameters through the LLEN pin. The source of the field effect transistor Q3 is grounded.

[0075] Capacitors C41, C42, and C43, together with resistors R33, R34, and R41, form a voltage and current monitoring circuit for monitoring the available capacitance, health status, voltage, and current of the supercapacitor.

[0076] The TS pin of the manager U5 is connected to the thermistor RT1 for monitoring the temperature parameters of the supercapacitor. The SCL pin of the manager U5 is connected to the resistors R23 and R24. The capacitor C34 is connected between the resistors R23 and R24 and grounded to form a clock synchronization circuit.

[0077] The FAULT pin of the manager U5 is connected to resistors R25 and R26, and C35 is connected between the resistors R25 and R26 to ground to serve as a fault indication.

[0078] The SDA pin of the manager U5 is connected to resistors R27 and R28, and a capacitor C36 is connected between the resistors R27 and R28 to ground for data communication.

[0079] The CHGOR pin of manager U5 is grounded to provide overvoltage protection.

[0080] CAN communication circuit 5 Figure 4 As shown, the input end is filtered by a magnetic bead FB2 and capacitors C10 and C11, the output end capacitors C6, C7 and C8 are filtered, and capacitors C4 and C5 are matched with the terminal resistor R1 to optimize the transmission quality and anti-interference ability of the CAN communication circuit 5.

[0081] Charging configuration circuit 2 Figure 5 As shown, it is used to configure the supercapacitor charging voltage and current. The input end of the charging configuration circuit 2 is externally connected to two capacitors (capacitor C37 and capacitor C38). The large capacitor plays a role in reducing ripples, and the small capacitor is used for high-frequency filtering and anti-interference. Resistors R31, R37, R39 and capacitor C40 form a voltage-dividing resistor network for monitoring the output voltage. The remaining resistors, capacitors and inductors play a role in output filtering to ensure the stability of the output voltage.

[0082] The first power conversion circuit 6 is as follows Figure 6 As shown, two capacitors are connected to the VIN pin, the large capacitor plays a role in reducing ripples, the small capacitor is used for high-frequency filtering and anti-interference, the resistor R47, the resistor R53 and the capacitor C58 form a voltage-dividing resistor network for monitoring the output, the resistor R44 and the resistor R49 control the enable, the capacitor C51 is used to provide a high-sensing MOSFET drive voltage, and the inductor L3 and the capacitor C60, the capacitor C61 and the capacitor C62 form a filtering circuit. The principle of the second power conversion circuit 7 is similar to that of the first power conversion circuit 6, which will not be repeated here.

[0083] In summary, the backup power management system for the tethered drone cable retraction and deployment device provided in this application has an active capacitor voltage balancing function. It solves the problem of unstable output voltage caused by increasing the voltage of the series supercapacitor through energy transfer, and also prevents the backup power supply from overvoltage during the charging process. At the same time, it integrates protection and monitoring functions, including short circuit, overheating and other functions, effectively reducing the loss of electrical equipment, improving the efficiency of power utilization, and reducing costs and increasing efficiency.

[0084] At the same time, a power resistor R66 is added at the output end of the supercapacitor management circuit to limit the charging current, an anti-backflow diode D3 is added to prevent the supercapacitor end voltage from backflowing to the charging chip input end, and capacitors C73 / C74 / C75 / C76 are added to provide electromagnetic compatibility protection function to ensure the reliability and stability of the circuit.

[0085] In addition, it provides a capacitor health status monitoring function, including operating status, charging status, health status, etc., and can report the voltage, charging voltage, charging current and other status information of a single capacitor through CAN communication, ensuring the stability of supercapacitor charging and discharging, and ensuring the stability and reliability of information exchange between the ground and the drone in the event of abnormal power supply of the tethered cable retraction device.

[0086] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0087] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product can be stored in a storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application or certain parts of the embodiments.

[0088] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A backup power management system for a tethered drone cable retracting device, characterized in that: It includes a charging configuration circuit, a supercapacitor management circuit, a supercapacitor group, a CAN communication circuit and a first power conversion circuit; the charging configuration circuit is respectively connected to the power module and the supercapacitor management circuit, the supercapacitor group is respectively connected to the supercapacitor management circuit and the first power conversion circuit, and the CAN communication circuit is respectively connected to the supercapacitor management circuit and the supercapacitor group; the supercapacitor group includes a plurality of supercapacitors connected in series; The charging configuration circuit is used to configure the input current provided by the power module to the charging voltage and charging current required by the plurality of supercapacitors; The supercapacitor management circuit is used to implement a health status monitoring function and a protection monitoring function for each supercapacitor according to the status information of each supercapacitor reported by the CAN communication circuit; The first power conversion circuit is used to convert the voltage of the output current of the supercapacitor group to adapt to the voltage of the current required by the board in the cable box of the tethered drone; The output end of the supercapacitor management circuit is provided with an anti-backflow diode D3 and a power resistor R66. The anti-backflow diode D3 is used to prevent the voltage at the supercapacitor end from backflowing to the input end of the manager U5. The power resistor R66 is used to limit the charging current to ensure that the individual capacitor monitoring and balancing functions remain normal. The output end of the supercapacitor management circuit is connected to a field effect transistor Q1 and a photocoupler U4 to perform signal isolation, level conversion and circuit protection on the circuit; the power resistor R66 is connected to both ends of the field effect transistor Q1 in parallel; The VCC of the supercapacitor management circuit is connected to the positive electrode of the first supercapacitor CAP1, the positive electrode of the first supercapacitor CAP1 is connected to the drain of the field effect transistor Q4, the negative electrode of the first supercapacitor CAP1 is connected to the resistor R29 and the positive electrode of the next supercapacitor CAP2, the other end of the resistor R29 is connected to the source of the field effect transistor Q4, the gate of the field effect transistor Q4 is connected to the VC pin of the manager, and a voltage balancing circuit is formed by the resistor R22, the resistor R29 and the capacitor C33; the positive electrode of the first supercapacitor CAP1 is connected to the drain of the field effect transistor Q4, the negative electrode of the first supercapacitor CAP1 is connected to the resistor R29 and the positive electrode of the next supercapacitor CAP2, the other end of the resistor R29 is connected to the source of the field effect transistor Q4, the gate of the field effect transistor Q4 is connected to the VC pin of the manager, and the resistor R22, the resistor R29 and the capacitor C33 form a voltage balancing circuit ... drain of the field effect transistor Q4, the negative electrode of the first supercapacitor CAP1 is connected to the drain of the field effect transistor Q4, the negative electrode of the first supercapacitor CAP1 is connected to A diode D1 is connected to a resistor R18, the other end of the resistor R18 is connected to a transistor Q2, the manager controls the on / off of the transistor Q2 through the REG27 pin, the other end of the transistor Q2 is connected to a resistor R20 and a resistor R21 connected in parallel, the other ends of the resistors R20 and R21 are respectively connected to the drain of the field effect transistor Q3, the gate of the field effect transistor Q3 is connected to the LLEN pin of the manager, the manager measures the supercapacitor equivalent series resistance and related parameters through the LLEN pin, and the source of the field effect transistor Q3 is grounded; The supercapacitor management circuit also includes a voltage and current monitoring circuit composed of capacitor C41, capacitor C42, capacitor C43, resistor R33, resistor R34, and resistor R41, which is used to monitor the available capacitance, health status, voltage, and current of the supercapacitor; The TS pin of the manager is connected to the thermistor RT1 for monitoring the temperature parameters of the supercapacitor; The SCL pin of the manager is connected to a resistor R23 and a resistor R24 ​​connected in series, a capacitor C34 is connected between the resistor R23 and the resistor R24, and the capacitor C34 is grounded to form a clock synchronization circuit; The FAULT pin of the manager is connected to a resistor R25 and a resistor R26 connected in series, a capacitor C35 is connected between the resistor R25 and the resistor R26, and the capacitor C35 is grounded to serve as a fault indication; The SDA pin of the manager is connected to resistors R27 and R28 connected in series, a capacitor C36 is connected between the resistors R27 and R28, and the capacitor C36 is grounded to play a role in data communication; The CHGOR pin of the manager is grounded to act as an overvoltage protection.

2. The backup power management system for the cable retracting device of a tethered drone according to claim 1, characterized in that: The content of the health status monitoring includes at least the operating status, charging status, and health status; the content of the protection monitoring includes at least overvoltage protection, short circuit protection, and overheating protection.

3. The backup power management system for the cable retracting device of a tethered drone according to claim 1, characterized in that: The input end of the CAN communication circuit includes a first filter circuit composed of a magnetic bead FB2, a capacitor C10, and a capacitor C11, and the output end of the CAN communication circuit includes a second filter circuit composed of a capacitor C6, a capacitor C7, and a capacitor C8.

4. The backup power management system for the cable retracting device of a tethered drone according to claim 3 is characterized in that: The CAN communication circuit also includes an anti-interference circuit composed of capacitors C4 and C5 matched with a terminal resistor R1, and the anti-interference circuit is used to optimize the transmission quality and anti-interference capability of the CAN communication circuit.

5. The backup power management system for the cable retracting device of a tethered drone according to claim 1, characterized in that: The input end of the charging configuration circuit is externally connected to capacitor C37 and capacitor C38, and the capacitor C37 and capacitor C38 are used to reduce ripples and perform high-frequency filtering and anti-interference; resistor R31, resistor R37, resistor R39 and capacitor C40 form a voltage-dividing resistor network for monitoring the output voltage; resistor R32, capacitor C48, capacitor C47 and inductor L1 play the role of output filtering to ensure the stability of the output voltage.

6. The backup power management system for the cable retracting device of a tethered drone according to claim 1, characterized in that: The VIN pin of the synchronous buck converter of the first power conversion circuit is externally connected to capacitor C53 and capacitor C54, and the capacitor C53 and capacitor C54 are used to reduce ripple and perform high-frequency filtering and anti-interference; resistor R47, resistor R53 and capacitor C58 form a voltage-dividing resistor network for monitoring the output; resistor R44 and resistor R49 control enable, capacitor C51 is used to provide a driving voltage for the high field effect transistor, and inductor L3 and capacitor C60, capacitor C61, and capacitor C62 form a filtering circuit.

7. The backup power management system for the cable retracting device of a tethered drone according to claim 1, characterized in that: It also includes a second power conversion circuit, a power chip and a microcontroller, wherein the second power conversion circuit is connected to the power module and the power chip respectively, and the power chip is connected to the microcontroller; The second power conversion circuit is used to adjust the voltage of the current input by the power module to a voltage adapted by the power chip and a voltage adapted to the current required by the board in the tethered drone cable box. The power chip is used to adjust the current voltage to a voltage adapted by the microcontroller.

Images