Control circuit of unmanned aerial vehicle and unmanned aerial vehicle

Abstract

The utility model provides a control circuit of an unmanned aerial vehicle and the unmanned aerial vehicle, and relates to the technical field of unmanned aerial vehicles, and the control circuit of the unmanned aerial vehicle comprises a voltage detection circuit which is used for detecting the connection state of a power signal line of a wired unmanned aerial vehicle and outputting a corresponding power connection signal; the first controlled end of the battery power supply circuit is connected with the output end of the voltage detection circuit, and the battery power supply circuit is used for supplying power to the unmanned aerial vehicle under the condition that the power supply connection signal is not connected; the power input end of the master control circuit is electrically connected with the power interface and the output end of the battery power supply circuit. The unmanned aerial vehicle can still operate stably when the power signal line is disconnected, the crash risk caused by power failure is avoided, and the flight safety is improved.

Description

Technical Field

[0001] This application relates to the field of unmanned aerial vehicle (UAV) technology, and more particularly to a control circuit for a UAV and the UAV itself. Background Technology

[0002] Unmanned aerial vehicles (UAVs) are unmanned aircraft controlled by radio remote control equipment and their own program control devices, or operated autonomously, either completely or intermittently, by an onboard computer. However, when natural disasters such as earthquakes, floods, and mudslides occur, communication in the disaster area is disrupted, making it difficult for traditional wireless UAVs to operate stably.

[0003] To address communication issues, technicians have adopted wired drones instead of wireless ones. However, wired connections are easily damaged in disaster environments, causing the power signal line to disconnect from the drone, resulting in an immediate loss of external power. In critical application scenarios such as industrial inspection and emergency rescue, power outages leading to drone crashes can cause significant economic losses and social impact. Utility Model Content

[0004] The main purpose of this invention is to provide a control circuit for a drone, which aims to ensure that the drone can still operate stably when the power signal line is disconnected, avoid the risk of crash due to power failure, and improve flight safety.

[0005] To achieve the above objectives, this utility model provides a control circuit for a wired unmanned aerial vehicle (UAV). The wired UAV includes a power interface for connecting a power signal cable. The control circuit of the UAV includes:

[0006] A voltage detection circuit is used to detect the connection status of the power signal line of the wired UAV and output a corresponding power connection signal.

[0007] A battery power supply circuit, wherein the first controlled terminal of the battery power supply circuit is connected to the output terminal of the voltage detection circuit, and the battery power supply circuit is used to supply power to the drone when the power connection signal is not connected;

[0008] The main control circuit has its power input terminal electrically connected to both the power interface and the output terminal of the battery power supply circuit.

[0009] Optionally, the voltage detection circuit includes:

[0010] A switching transistor, wherein the gate of the switching transistor is connected to the positive terminal of the power interface, and a first resistor is connected in parallel between the gate and the source of the switching transistor;

[0011] The second resistor has a first end connected to the gate of the switching transistor and a second end grounded.

[0012] When the power signal line connected to the power interface is connected, the switching transistor is at a high level and is off; when the power signal line connected to the power interface is disconnected, the switching transistor is at a low level and is on, and outputs the power connection signal.

[0013] Optionally, the battery-powered circuit includes:

[0014] A battery connection terminal, the first end of which is grounded, is used to connect a power supply battery.

[0015] The transistor has its collector connected to the second terminal of the battery connection terminal, and its emitter connected to the drain of the switching transistor.

[0016] The third resistor has its first end connected to the source of the switching transistor and its second end grounded.

[0017] When the power signal line connected to the power interface is disconnected, the switching transistor is turned on, so that the power supply of the battery is output to the power input terminal of the main control circuit through the switching transistor.

[0018] Optionally, the control circuit of the UAV further includes:

[0019] A battery power detection circuit is provided, wherein the input terminal of the battery power detection circuit is connected to the output terminal of the battery power supply circuit, and the output terminal of the battery power detection circuit is connected to the second controlled terminal of the battery power supply circuit.

[0020] Optionally, the battery power detection circuit includes:

[0021] An operational amplifier chip, wherein a fourth resistor is connected between the output terminal of the operational amplifier chip and the base of the transistor, and a fifth resistor is connected between the inverting terminal and the output terminal of the operational amplifier chip;

[0022] The sixth resistor has its first end connected to the output terminal of the battery power supply circuit and its second end connected to the inverting input of the operational amplifier chip.

[0023] The seventh resistor has its first end grounded and its second end connected to the non-inverting input of the operational amplifier chip.

[0024] Optionally, the control circuit of the UAV further includes:

[0025] A first unidirectional circuit, wherein a first end of the first unidirectional circuit is connected to the output end of the power interface, and a second end of the first unidirectional circuit is connected to the power input end of the main control circuit;

[0026] The second unidirectional circuit has its first end connected to the output end of the battery power supply circuit and its second end connected to the power input end of the main control circuit.

[0027] Optionally, the first unidirectional circuit includes:

[0028] The first diode has its anode connected to the output terminal of the power interface and its cathode connected to the power input terminal of the main control circuit.

[0029] The second unidirectional circuit includes:

[0030] The second diode has its anode connected to the output terminal of the battery power supply circuit, and its second terminal connected to the power input terminal of the main control circuit.

[0031] Optionally, the control circuit of the UAV further includes:

[0032] An energy storage circuit is provided, the input terminal of which is connected to the output terminal of the power interface. The energy storage circuit is used to store energy when the power signal line plugged into the power interface is connected, and to supply power when the power signal line plugged into the power interface is disconnected.

[0033] Optionally, the energy storage circuit includes:

[0034] A supercapacitor, the positive terminal of which is connected to the output terminal of the power interface, and the negative terminal of which is grounded.

[0035] In addition, to achieve the above objectives, this utility model also provides a drone, including the control circuit of the drone as described above.

[0036] The drone of this embodiment is a wired drone. The wired drone includes a power interface for connecting a power signal line. The drone's control circuit includes a voltage detection circuit, a battery power supply circuit, and a main control circuit. First, the voltage detection circuit detects the connection status of the power signal line of the wired drone and outputs a corresponding power connection signal. Then, the first controlled terminal of the battery power supply circuit is connected to the output terminal of the voltage detection circuit, and the battery power supply circuit supplies power to the drone when the power connection signal is not connected. Finally, the power input terminal of the main control circuit is electrically connected to both the power interface and the output terminal of the battery power supply circuit, thereby ensuring that the drone can still operate stably when the power signal line is disconnected, avoiding the risk of crash due to power failure, and improving flight safety. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a circuit block diagram of the control circuit of an unmanned aerial vehicle according to an embodiment of the present invention;

[0040] Figure 2 A circuit block diagram of the control circuit of a drone according to another embodiment of the present invention;

[0041] Figure 3 This is a circuit block diagram of the control circuit of a drone according to another embodiment of the present invention;

[0042] Figure 4 This is a circuit block diagram of the control circuit of a drone according to another embodiment of the present invention;

[0043] Figure 5 A circuit block diagram of the control circuit of a drone according to another embodiment of the present invention;

[0044] Figure 6 A circuit block diagram of the control circuit of a drone according to another embodiment of the present invention;

[0045] Figure 7 This is a circuit block diagram of the control circuit of a drone according to another embodiment of the present invention;

[0046] Figure 8 This is a circuit block diagram of the control circuit of a drone according to another embodiment of the present invention.

[0047] Explanation of icon numbers:

[0048] label name label name 10 Power interface 50 Battery power detection circuit 20 Voltage detection circuit 60 First unidirectional circuit 30 Battery power supply circuit 70 Second unidirectional circuit 40 Main control circuit 80 Energy storage circuit

[0049] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0050] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Well-known modules, units, and their connections, links, communications, or operations are not shown or described in detail. Furthermore, the described features, architectures, or functions can be combined in any way in one or more embodiments. Those skilled in the art should understand that the various embodiments described below are only for illustrative purposes and are not intended to limit the scope of protection of the present invention.

[0051] Unmanned aerial vehicles (UAVs) are unmanned aircraft controlled by radio remote control equipment and their own program control devices, or operated autonomously, either completely or intermittently, by an onboard computer. However, when natural disasters such as earthquakes, floods, and mudslides occur, communication in the disaster area is disrupted, making it difficult for traditional wireless UAVs to operate stably.

[0052] To address communication issues, technicians have adopted wired drones instead of wireless ones. However, wired connections are easily damaged in disaster environments, causing the power signal line to disconnect from the drone, resulting in an immediate loss of external power. In critical application scenarios such as industrial inspection and emergency rescue, power outages leading to drone crashes can cause significant economic losses and social impact.

[0053] The main solution of this application embodiment is as follows: The wired drone includes a power interface for connecting a power signal line. The control circuit of the drone includes a voltage detection circuit, a battery power supply circuit, and a main control circuit. First, the voltage detection circuit detects the connection status of the power signal line of the wired drone and outputs a corresponding power connection signal. Then, the first controlled terminal of the battery power supply circuit is connected to the output terminal of the voltage detection circuit, and the battery power supply circuit supplies power to the drone when the power connection signal is not connected. Finally, the power input terminal of the main control circuit is electrically connected to the power interface and the output terminal of the battery power supply circuit, respectively.

[0054] This application provides a solution to ensure that drones can still operate stably when the power signal line is disconnected, thereby avoiding the risk of crashes due to power failure and improving flight safety.

[0055] In existing technologies, wired drones generally maintain flight by directly connecting to an external power source. During missions, if these drones encounter obstacles or experience a loose connection that causes the power signal cable to detach, the flight control system will immediately cease operation due to power interruption. For example, when performing inspection missions in complex terrain, the drone may experience power outages due to tangled cables, potentially leading to equipment damage or mission failure.

[0056] The primary cause of the accident was power outage due to disconnection of the power signal line, necessitating the determination of how to maintain control system operation in the event of external power failure. By analyzing the relationship between the power interface 10 status and power supply mode, a solution is proposed to automatically switch to backup power by real-time monitoring of the power connection status, thereby eliminating the risk of system paralysis caused by power outages.

[0057] It should be noted that the drone in this embodiment is a wired drone. The wired drone includes a power interface 10, which is used to connect a power signal cable.

[0058] Based on the above, referring to Figure 1 In one embodiment of this utility model, the control circuit of the UAV includes a voltage detection circuit 20, a battery power supply circuit 30, and a main control circuit 40, wherein:

[0059] The voltage detection circuit 20 is used to detect the connection status of the power signal line of the wired drone and output the corresponding power connection signal; the first controlled terminal of the battery power supply circuit 30 is connected to the output terminal of the voltage detection circuit 20, and the battery power supply circuit 30 is used to supply power to the drone when the power connection signal is not connected; the power input terminal of the main control circuit 40 is electrically connected to the power interface 10 and the output terminal of the battery power supply circuit 30 respectively.

[0060] The voltage detection circuit 20 refers to a circuit module capable of identifying the physical connection status of the power signal line. It can be implemented using a field-effect transistor and voltage divider resistors to form a level detection loop, determining the connection status by comparing the interface voltage with a preset threshold. The battery power supply circuit 30 refers to a backup power path controlled by the connection status signal. It can be implemented using a transistor switch and a battery interface to form a controlled power supply loop, automatically switching on battery power when an external power supply disconnection is detected. The main control circuit 40 refers to the core processing unit of the flight control system, which can be implemented using a microcontroller or a dedicated chip. Its power input terminal is designed with a dual-input structure compatible with both external power and battery power.

[0061] When the power signal line remains properly connected to the interface, the voltage detection circuit 20 outputs a high-level signal to suppress the battery power supply circuit 30, and the main control circuit 40 is directly powered by an external power source. If the power signal line is accidentally disconnected, causing the interface voltage to drop below a threshold, the voltage detection circuit 20 outputs a low-level trigger signal, driving the transistor in the battery power supply circuit 30 to conduct, allowing the built-in battery to continuously supply power to the main control circuit 40 through this path. The dual-power input design of the main control circuit 40 ensures a stable power supply in any power supply mode, thereby maintaining the normal operation of flight control functions.

[0062] Compared to existing technologies, traditional wired drones lack power status detection and automatic switching mechanisms, resulting in direct power loss during power outages. This embodiment, by adding status detection and controlled switching circuitry, enables the drone to seamlessly switch to a backup power source in the event of a power failure, effectively preventing downtime caused by cable detachment.

[0063] Through the above-mentioned technical means, this embodiment realizes intelligent switching between external power supply and backup battery power supply, ensuring that the UAV can still maintain normal operation of the control system when the power signal line is unexpectedly disconnected, which significantly improves the reliability and safety of the equipment under complex working conditions.

[0064] The drone in this embodiment is a wired drone, which includes a power interface 10 for connecting a power signal line. The drone's control circuit includes a voltage detection circuit 20, a battery power supply circuit 30, and a main control circuit 40. First, the voltage detection circuit 20 detects the connection status of the power signal line of the wired drone and outputs a corresponding power connection signal. Then, the first controlled terminal of the battery power supply circuit 30 is connected to the output terminal of the voltage detection circuit 20, and the battery power supply circuit 30 supplies power to the drone when the power connection signal is not connected. Finally, the power input terminal of the main control circuit 40 is electrically connected to the power interface 10 and the output terminal of the battery power supply circuit 30, thereby ensuring that the drone can still operate stably when the power signal line is disconnected, avoiding the risk of crash due to power failure, and improving flight safety.

[0065] Optionally, refer to Figure 2 Another embodiment of this utility model provides a control circuit for a drone, based on the above. Figure 1 In the embodiment shown, the voltage detection circuit 20 includes a switching transistor Q1 and a second resistor R1, wherein:

[0066] The gate of the switching transistor Q1 is connected to the positive terminal of the power interface 10, and a first resistor R3 is connected in parallel between the gate and source of the switching transistor Q1; the first end of the second resistor R1 is connected to the gate of the switching transistor Q1, and the second end of the second resistor R1 is grounded; when the power signal line plugged into the power interface 10 is connected, the switching transistor Q1 is at a high level and is cut off; when the power signal line plugged into the power interface 10 is disconnected, the switching transistor Q1 is at a low level and is turned on, and outputs the power connection signal.

[0067] In this circuit, the switching transistor Q1 is a semiconductor device used to control the on / off state of the circuit. It can be implemented using a field-effect transistor (FET), and the conduction state between the source and drain is controlled by changes in the gate voltage. The first resistor R3 is a current-limiting element connected in parallel between the gate and source of the switching transistor Q1. It can be implemented using a surface-mount resistor with a fixed resistance value and is used to discharge gate charge to prevent false triggering. The second resistor R1 is a pull-down resistor, ensuring that the switching transistor Q1 remains at a low level when the power signal line connected to the power interface 10 is disconnected. It can be implemented using a high-precision metal film resistor and is used to pull down the gate potential when the power signal line is disconnected.

[0068] When the power interface 10 is connected to the power signal line, the high level at the positive terminal is transmitted to the gate of the switching transistor Q1 through the wire. At this time, the gate voltage is higher than the conduction threshold, and the switching transistor Q1 is in the off state, with no current flowing through the source and drain. When the power signal line is accidentally disconnected, the gate voltage is pulled down to a low level by the second resistor R1, the switching transistor Q1 is turned on, and a current path is formed between the source and drain, thereby generating a low-level signal indicating that the power is disconnected. Thus, the power connection state is converted into a recognizable level signal output.

[0069] This embodiment can monitor the power connection status of wired drones in real time and immediately trigger battery power switching when the power cord is unexpectedly disconnected, solving the problem of drones losing control and crashing due to sudden power outages. The detection circuit has a simple structure and responds quickly, requiring no additional complex detection modules, thus reducing the overall system cost.

[0070] Optionally, the battery power supply circuit 30 includes a battery connection terminal H1, a transistor Q2, and a third resistor R2, wherein:

[0071] The first end of the battery connection terminal H1 is grounded, and the battery connection terminal H1 is used to connect the power supply battery; the collector of the transistor Q2 is connected to the second end of the battery connection terminal H1, and the emitter of the transistor Q2 is connected to the drain of the switching transistor Q1; the first end of the third resistor R2 is connected to the source of the switching transistor Q1, and the second end of the third resistor R2 is grounded; when the power signal line connected to the power interface 10 is disconnected, the switching transistor Q1 is turned on, so that the power supply battery is output to the power input terminal of the main control circuit 40 through the switching transistor Q1.

[0072] Among them, battery connection terminal H1 is the physical interface used to fix and conduct the power supply battery. It can be implemented using metal contacts or a slot structure, and its function is to provide a stable electrical connection path for the external battery. Transistor Q2 is a current-controlled semiconductor device, which can be implemented using a PNP transistor. Its base is controlled by a voltage detection signal to turn the battery power supply circuit on or off. The third resistor R2 is an electronic component that limits the current or divides the voltage. It can be implemented using a carbon film resistor or a metal film resistor. Its function is to provide a stable bias voltage for the switching transistor Q1, ensuring the reliability of signal transmission.

[0073] When the power signal line is connected, the switching transistor Q1 is in the off state, and the base of transistor Q2 cannot receive drive current, thus disconnecting the battery power supply circuit. If the power signal line is accidentally disconnected, the voltage detection circuit 20 outputs a low-level signal to trigger the switching transistor Q1 to conduct. At this time, the base of transistor Q2 forms a loop with ground through the third resistor R2. After transistor Q2 conducts, it transmits the voltage from the battery to the power input terminal of the main control circuit 40. During this process, the third resistor R2 limits the current flowing through the base of transistor Q2 through voltage division, preventing damage to the device due to overcurrent.

[0074] Existing solutions rely on a single energy storage element to maintain power supply when the power line is disconnected, which has the drawbacks of short power supply time and inability to actively switch to backup power. This embodiment introduces the coordinated control of transistor Q2 and switching transistor Q1, which can activate backup battery power supply in milliseconds after detecting a power interruption, without the need for additional complex logic control circuitry.

[0075] Through the aforementioned technical means, this embodiment achieves the function of automatically switching to battery power when the power signal line is unexpectedly disconnected, effectively preventing the drone from losing system control due to power failure. Furthermore, the simple control loop formed by transistor Q2 and the third resistor R2 reduces hardware costs and improves circuit reliability, making it suitable for industrial-grade drone scenarios requiring rapid power switching.

[0076] Optionally, refer to Figure 3 Another embodiment of this utility model provides a control circuit for a drone, based on the above. Figure 1 In the embodiment shown, the drone's control circuit also includes a battery power detection circuit 50, wherein:

[0077] The input terminal of the battery power detection circuit 50 is connected to the output terminal of the battery power supply circuit 30, and the output terminal of the battery power detection circuit 50 is connected to the second controlled terminal of the battery power supply circuit 30.

[0078] The battery power detection circuit 50 is a circuit module used to monitor the remaining power of the power supply battery. It can be implemented using a voltage comparison circuit, which outputs a control signal by comparing the battery voltage with a preset threshold. The second controlled terminal is the control port in the battery power supply circuit 30 that receives the power detection signal. It can be implemented using the base connection point of transistor Q2. When insufficient power is detected, the signal triggers the power supply circuit to disconnect through this port. It can also control the battery management circuit to charge the power supply battery when the power signal line is connected, ensuring that the battery has continuous power and maintaining the safety of the drone.

[0079] When the power signal line connected to the power interface 10 is disconnected, the battery power supply circuit 30 begins to supply power to the drone. At this time, the battery power detection circuit 50 continuously acquires the output voltage of the battery power supply circuit 30 through its input terminal and compares it with a preset voltage threshold. For example, when the battery voltage is lower than the threshold, the power detection circuit sends a low-level signal to the second controlled terminal of the battery power supply circuit 30 through its output terminal, causing transistor Q2 to turn off, thereby cutting off battery power. Thus, the drone automatically stops supplying power when the battery is low, preventing the drone from becoming uncontrollable due to battery depletion.

[0080] Compared to existing technologies, current wired drones rely solely on battery power after the power cord is disconnected, but lack a real-time battery level monitoring mechanism, which may lead to the drone suddenly losing power and crashing after the battery is completely depleted. This embodiment, through the coordinated control of the battery level detection circuit 50 and the power supply circuit, can proactively cut off power when the battery is low, providing operators with a safe response time.

[0081] Through the above-mentioned technical means, this embodiment realizes dynamic monitoring of battery power and autonomous power-off protection, effectively preventing the drone from crashing due to power interruption when the battery power is exhausted, and improving the safety and controllability of wired drones in emergency power supply mode.

[0082] Optionally, refer to Figure 4 Another embodiment of this utility model provides a control circuit for a drone, based on the above... Figure 3 In the embodiment shown, the battery power detection circuit 50 includes an operational amplifier chip U3.1, a sixth resistor R5, and a seventh resistor R6, wherein:

[0083] A fourth resistor R7 is connected between the output terminal of the operational amplifier chip U3.1 and the base of the transistor Q2; a fifth resistor R8 is connected between the inverting input and the output terminal of the operational amplifier chip U3.1; the first terminal of the sixth resistor R5 is connected to the output terminal of the battery power supply circuit 30, and the second terminal of the sixth resistor R5 is connected to the inverting input of the operational amplifier chip U3.1; the first terminal of the seventh resistor R6 is grounded, and the second terminal of the seventh resistor R6 is connected to the non-inverting input of the operational amplifier chip U3.1.

[0084] The operational amplifier chip U3.1 refers to an operational amplifier integrated circuit with differential input and single-ended output, which can be implemented using LM358 or LM393, etc., and is used to compare the battery supply voltage with the reference voltage and output a control signal. The fourth resistor R7 is a current-limiting component with a resistance range of 1kΩ to 10kΩ, which can be implemented using a surface-mount resistor, and is used to adjust the drive current from the op-amp output to the base of transistor Q2. The sixth resistor R5 and the seventh resistor R6 are matching resistors that form a voltage divider network, with resistance ranges between 10kΩ and 100kΩ respectively, used to proportionally attenuate the battery voltage before inputting it to the op-amp's inverting input. The fifth resistor R8 is a feedback resistor connected between the op-amp's inverting input and output, with a resistance range between 10kΩ and 1MΩ, used to stabilize the op-amp's operating state and create hysteresis characteristics.

[0085] When the output voltage of the battery power supply circuit 30 drops, the voltage divider network formed by the sixth resistor R5 and the seventh resistor R6 inputs the attenuated voltage to the inverting input of the operational amplifier (op-amp) and compares it with the fixed reference voltage at the non-inverting input. When the voltage at the inverting input is lower than the reference voltage, the op-amp outputs a high-level signal, which drives the transistor Q2 to conduct through the fourth resistor R7, allowing the battery power supply circuit 30 to continue maintaining the power input to the main control circuit 40. When the battery voltage is too low, the voltage divider network causes the voltage at the inverting input to exceed the reference voltage, the op-amp outputs a low-level signal, and the transistor Q2 turns off the power supply circuit to prevent over-discharge damage to the battery. The positive feedback formed by the fifth resistor R8 prevents the circuit from frequently switching at critical voltage points.

[0086] This embodiment uses an operational amplifier chip U3.1 combined with a voltage divider network and a feedback resistor to form a detection circuit, which can accurately set the power threshold and eliminate the influence of voltage jitter through hysteresis characteristics. At the same time, it uses transistor Q2 to realize fast on / off control of the power supply circuit.

[0087] Through the above-mentioned technical means, this embodiment realizes real-time monitoring and precise control of battery power. When the external power is disconnected, it can automatically switch the power supply state according to the remaining battery power. This ensures that the drone continues to receive a stable power supply after the main power is disconnected, and also prevents the battery from being damaged due to over-discharge, thereby effectively solving the problem of crashes when wired drones suddenly lose power.

[0088] Optionally, refer to Figure 5 In another embodiment of this utility model, a control circuit for a drone is provided, based on the above. Figures 1 to 4 In any of the embodiments shown, the control circuit of the UAV further includes a first unidirectional circuit 60 and a second unidirectional circuit 70, wherein:

[0089] The first end of the first unidirectional circuit 60 is connected to the output end of the power interface 10, and the second end of the first unidirectional circuit 60 is connected to the power input end of the main control circuit 40; the first end of the second unidirectional circuit 70 is connected to the output end of the battery power supply circuit 30, and the second end of the second unidirectional circuit 70 is connected to the power input end of the main control circuit 40.

[0090] The first unidirectional circuit 60 is a unidirectional conducting device that allows current to flow from the power interface 10 to the main control circuit 40, and can be implemented using a diode. This circuit prevents the current in the main control circuit 40 from flowing back into the power interface 10 when the external power supply is disconnected, thus avoiding safety hazards caused by live power signal lines. The second unidirectional circuit 70 is a unidirectional conducting device that allows current to flow from the battery power supply circuit 30 to the main control circuit 40, and can also be implemented using a diode. This circuit blocks the current in the main control circuit 40 from flowing back into the battery power supply circuit 30, preventing the battery from being accidentally charged or experiencing energy loss when an external power source is connected.

[0091] When the power interface 10 is normally powered through the power signal line, the current from the external power supply is delivered to the main control circuit 40 via the first unidirectional circuit 60. At this time, the second unidirectional circuit 70 is in a reverse cutoff state because the battery power supply circuit 30 is not activated. If the power signal line is accidentally disconnected, the battery power supply circuit 30 is activated, and its output current supplies power to the main control circuit 40 through the second unidirectional circuit 70. At this time, the first unidirectional circuit 60 is cut off because the external power supply is disconnected. Thus, the two unidirectional circuits achieve automatic switching of the power path through their unidirectional conduction characteristics, while avoiding current backflow between different power sources.

[0092] This embodiment physically isolates the power path using a unidirectional circuit, eliminating mutual interference between different power sources and ensuring that the main control circuit 40 receives a stable power supply from only one power source. Through these technical means, this embodiment solves the power supply fluctuation problem caused by current backflow during power switching, improving the power supply reliability of the drone when the external power supply is unexpectedly disconnected, thereby effectively reducing the risk of drone loss of control due to power switching failure.

[0093] Optionally, refer to Figure 6 Another embodiment of this utility model provides a control circuit for a drone, based on the above. Figure 5 In the embodiment shown, the first unidirectional circuit 60 includes a first diode D1, wherein:

[0094] The positive terminal of the first diode D1 is connected to the output terminal of the power interface 10, and the negative terminal of the first diode D1 is connected to the power input terminal of the main control circuit 40.

[0095] The second unidirectional circuit 70 includes a second diode D2, wherein:

[0096] The positive terminal of the second diode D2 is connected to the output terminal of the battery power supply circuit 30, and the second terminal of the second diode D2 is connected to the power input terminal of the main control circuit 40.

[0097] The first unidirectional circuit 60 refers to the conductive path that allows current to flow from the power interface 10 to the main control circuit 40. This can be implemented using a forward-conducting diode, which blocks reverse current through its unidirectional conduction characteristic. The second unidirectional circuit 70 refers to the conductive path that allows current to flow from the battery-powered circuit 30 to the main control circuit 40. This can also be implemented using a forward-conducting diode, which blocks reverse current through its unidirectional conduction characteristic. The function of the first diode D1 and the second diode D2 is to isolate the current path between the power interface 10 and the battery-powered circuit 30, respectively, to prevent current backflow or voltage conflict when both power sources are supplied simultaneously.

[0098] When the power interface 10 is connected to an external power source via the power signal line, the first diode D1 is forward-biased, and the external power supply provides power to the main control circuit 40 through the first diode D1. At this time, the battery power supply circuit 30 is in the off state, and the second diode D2 is reverse-biased and cut off, preventing the external power supply current from flowing back into the battery power supply circuit 30. When the power signal line is disconnected, the battery power supply circuit 30 starts supplying power, the second diode D2 is forward-biased, and the battery power supply provides power to the main control circuit 40 through the second diode D2. At this time, the first diode D1 is reverse-biased and cut off, preventing the battery current from flowing back into the power interface 10. Through the unidirectional conduction characteristics of the two diodes, it is ensured that the main control circuit 40 only obtains power from the currently available power source.

[0099] This embodiment achieves power path isolation through the unidirectional conduction characteristic of diodes, automatically switching the power supply path without additional control signals. This simplifies the circuit structure and reduces component costs. Through the above technical means, this embodiment solves the current backflow problem that may occur when external power and battery power are present simultaneously, ensuring the uniqueness and stability of the power supply path for the main control circuit 40, avoiding the risk of voltage abnormalities or circuit damage due to power conflict, and improving the reliability of the UAV during power switching.

[0100] Optionally, refer to Figure 7 Another embodiment of this utility model provides a control circuit for a drone, based on the above. Figures 1 to 4In any of the embodiments shown, the control circuit of the UAV further includes an energy storage circuit 80, wherein:

[0101] The input terminal of the energy storage circuit 80 is connected to the output terminal of the power interface 10. The energy storage circuit 80 is used to store energy when the power signal line plugged into the power interface 10 is connected, and to supply power when the power signal line plugged into the power interface 10 is disconnected.

[0102] The energy storage circuit 80 is a circuit module that stores electrical energy when an external power source is connected and releases it when the power source is disconnected. It can be implemented using a supercapacitor C1, with its positive terminal connected to the output of the power interface 10 and its negative terminal grounded. The "connected" state of the power signal line plugged into the power interface 10 refers to the conductive state formed when the external power source supplies power to the drone through the signal line. In this state, the energy storage circuit 80 receives and stores electrical energy through the power interface 10. The "disconnected" state means that after the external power source is disconnected, the energy storage circuit 80 releases the stored electrical energy to the power input of the main control circuit 40 to maintain the power requirements for short-term drone operation.

[0103] When the power signal line remains connected to the power interface 10, the external power supply provides power to the main control circuit 40 through the power interface 10, while simultaneously charging the supercapacitor C1 in the energy storage circuit 80. At this time, the supercapacitor C1 is in an energy storage state, and its voltage gradually increases to match the external power supply voltage. When the power signal line is unexpectedly disconnected, causing an interruption in the external power supply, the energy stored in the supercapacitor C1 discharges through the connection path between its positive terminal and the power input terminal of the main control circuit 40, providing temporary power to the main control circuit 40. This allows the drone to maintain basic control functions before switching to battery power, preventing system crashes due to momentary power outages.

[0104] Compared with existing technologies, traditional wired drones lose power immediately after the power signal line is disconnected, causing the main control circuit 40 to stop working. However, this embodiment adds an energy storage circuit 80, which uses its energy storage characteristics to provide transitional power at the moment of power failure, thus providing a buffer time for the switching between the main control circuit 40 and the battery power supply circuit 30, thereby reducing the risk of loss of control caused by instantaneous power failure.

[0105] Through the above-mentioned technical means, this embodiment can maintain the operation of the drone for a short time by temporarily storing electrical energy through the energy storage circuit 80 when the power signal line is accidentally disconnected, effectively preventing crashes caused by power outages, and avoiding system power outages caused by the switching delay of the battery power supply circuit 30, thereby improving the reliability of the drone in the event of a sudden power outage.

[0106] Optionally, refer to Figure 8 Another embodiment of this utility model provides a control circuit for a drone, based on the above... Figure 7 In the embodiment shown, the energy storage circuit 80 includes a supercapacitor C1, wherein:

[0107] The positive terminal of the supercapacitor C1 is connected to the output terminal of the power interface 10, and the negative terminal of the supercapacitor C1 is grounded.

[0108] Among them, the energy storage circuit 80 refers to a circuit module used to store electrical energy when the power signal line is connected and release electrical energy when it is disconnected. It can be implemented using capacitors or batteries. For example, the farad capacitor C1 has fast charge and discharge characteristics and is suitable as an energy storage element for short-term power supply. The farad capacitor C1 refers to a large-capacity capacitor that stores charge based on the double-layer principle. It can be implemented using a wound or stacked structure. Its high power density and long cycle life enable it to release electrical energy rapidly when the power is disconnected.

[0109] When the power signal line is connected to the power interface 10, the external power supply provides power to the main control circuit 40 through the power interface 10, and the supercapacitor C1 is charged to store electrical energy. If the power signal line is accidentally disconnected, the electrical energy stored in the supercapacitor C1 is released to the power input terminal of the main control circuit 40, thereby maintaining the short-term operation of the UAV control system. The energy storage circuit 80 is designed without additional control logic; it achieves energy storage and release solely through the physical characteristics of the supercapacitor C1, resulting in a simple structure and high reliability.

[0110] In some specific implementations, the capacity of the supercapacitor C1 can be selected according to the power consumption requirements of the UAV main control circuit 40. For example, a supercapacitor C1 with a 5F / 5.5V specification can be used, and its energy storage capacity can support the main control circuit 40 to continue working for several seconds to tens of seconds after power failure, providing a buffer time for the UAV to switch to backup power or perform an emergency landing.

[0111] Compared to existing technologies, wired drones suffer immediate power outages when the power signal line is disconnected due to the lack of energy storage devices. This embodiment, however, adds an energy storage circuit 80 between the power interface 10 and the main control circuit 40, enabling the drone to still receive temporary power in the event of a sudden power outage. This improvement solves the system paralysis problem caused by instantaneous power interruptions in existing technologies, while avoiding the increased cost and size associated with introducing complex switching circuits.

[0112] Through the above-mentioned technical means, this embodiment can release the stored electrical energy through the supercapacitor C1 when the power signal line is accidentally disconnected, and provide power to the main control circuit 40 for several seconds, preventing the drone from losing control and crashing due to power failure of the main control system, and significantly improving the safety and reliability of the drone in the event of a sudden power failure.

[0113] This utility model also proposes an unmanned aerial vehicle (UAV) that includes the control circuit of the UAV as described in the above embodiments.

[0114] It is worth noting that since the UAV of this utility model is based on the control circuit of the aforementioned UAV, the embodiments of the UAV of this utility model include all the technical solutions of all embodiments of the control circuit of the aforementioned UAV, and the technical effects achieved are exactly the same, so they will not be repeated here.

[0115] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A control circuit for a drone, wherein the drone is a wired drone, the wired drone includes a power interface for connecting a power signal cable, characterized in that... The control circuit of the UAV includes: A voltage detection circuit is used to detect the connection status of the power signal line of the wired UAV and output a corresponding power connection signal. A battery power supply circuit, wherein the first controlled terminal of the battery power supply circuit is connected to the output terminal of the voltage detection circuit, and the battery power supply circuit is used to supply power to the drone when the power connection signal is not connected; The main control circuit has its power input terminal electrically connected to both the power interface and the output terminal of the battery-powered circuit.

2. The control circuit for the unmanned aerial vehicle as described in claim 1, characterized in that, The voltage detection circuit includes: A switching transistor, wherein the gate of the switching transistor is connected to the positive terminal of the power interface, and a first resistor is connected in parallel between the gate and the source of the switching transistor; The second resistor has a first end connected to the gate of the switching transistor and a second end grounded. When the power signal line connected to the power interface is connected, the switching transistor is at a high level and is off; when the power signal line connected to the power interface is disconnected, the switching transistor is at a low level and is on, and outputs the power connection signal.

3. The control circuit for the unmanned aerial vehicle as described in claim 2, characterized in that, The battery power supply circuit includes: A battery connection terminal, the first end of which is grounded, is used to connect a power supply battery. The transistor has its collector connected to the second terminal of the battery connection terminal, and its emitter connected to the drain of the switching transistor. The third resistor has its first end connected to the source of the switching transistor and its second end grounded. When the power signal line connected to the power interface is disconnected, the switching transistor is turned on, so that the power supply of the battery is output to the power input terminal of the main control circuit through the switching transistor.

4. The control circuit for the unmanned aerial vehicle as described in claim 3, characterized in that, The control circuit of the drone also includes: A battery power detection circuit is provided, wherein the input terminal of the battery power detection circuit is connected to the output terminal of the battery power supply circuit, and the output terminal of the battery power detection circuit is connected to the second controlled terminal of the battery power supply circuit.

5. The control circuit for the unmanned aerial vehicle as described in claim 4, characterized in that, The battery power detection circuit includes: An operational amplifier chip, wherein a fourth resistor is connected between the output terminal of the operational amplifier chip and the base of the transistor, and a fifth resistor is connected between the inverting terminal and the output terminal of the operational amplifier chip; The sixth resistor has its first end connected to the output terminal of the battery power supply circuit and its second end connected to the inverting input of the operational amplifier chip. The seventh resistor has its first end grounded and its second end connected to the non-inverting input of the operational amplifier chip.

6. The control circuit for the unmanned aerial vehicle as described in any one of claims 1 to 5, characterized in that, The control circuit of the drone also includes: A first unidirectional circuit, wherein a first end of the first unidirectional circuit is connected to the output end of the power interface, and a second end of the first unidirectional circuit is connected to the power input end of the main control circuit; The second unidirectional circuit has its first end connected to the output end of the battery-powered circuit and its second end connected to the power input end of the main control circuit.

7. The control circuit for the unmanned aerial vehicle as described in claim 6, characterized in that, The first unidirectional circuit includes: The first diode has its anode connected to the output terminal of the power interface and its cathode connected to the power input terminal of the main control circuit. The second unidirectional circuit includes: The second diode has its anode connected to the output terminal of the battery power supply circuit, and its second terminal connected to the power input terminal of the main control circuit.

8. The control circuit for the unmanned aerial vehicle as described in any one of claims 1 to 5, characterized in that, The control circuit of the drone also includes: An energy storage circuit is provided, the input terminal of which is connected to the output terminal of the power interface. The energy storage circuit is used to store energy when the power signal line plugged into the power interface is connected, and to supply power when the power signal line plugged into the power interface is disconnected.

9. The control circuit for the unmanned aerial vehicle as described in claim 8, characterized in that, The energy storage circuit includes: A supercapacitor, the positive terminal of which is connected to the output terminal of the power interface, and the negative terminal of which is grounded.

10. A drone, characterized in that, Includes the control circuit of the unmanned aerial vehicle as described in any one of claims 1 to 9.

Images