Parachute detonation circuit and drones

Abstract

This invention provides a parachute detonation circuit and a drone. The parachute detonation circuit includes a detection circuit and a detonation circuit. The detection circuit includes a first connection terminal, a second connection terminal, and a voltage detection terminal. The first and second connection terminals are used to connect to the parachute detonator of the drone, and the voltage detection terminal is connected to the control circuit of the drone to output a detection voltage. The detonation circuit is connected to the parachute detonator and includes a first receiving terminal and a second receiving terminal. The first and second receiving terminals are connected to the control circuit to receive a first detonation signal and a second detonation signal output by the control circuit, respectively. When the detection circuit is connected to the parachute detonator and the detection voltage meets a preset threshold, the detonation circuit detonates the parachute detonator according to the first and second detonation signals. This invention can improve the reliability of the detonation circuit.

Description

Technical Field

[0001] This invention relates to the field of unmanned aerial vehicle (UAV) technology, specifically to a parachute detonation circuit and a UAV. Background Technology

[0002] The new national standard requires small drones to be equipped with parachutes to reduce risks; therefore, both aerial photography drones and performance drones are now equipped with parachutes. The drone's parachute needs to be opened by a parachute detonator, so drones usually have a detonation circuit to detonate the detonator. However, during actual flight, collisions or other factors may cause the parachute to fail to connect properly to the drone. In this case, even if the detonation circuit is successfully activated, the parachute will not open, resulting in low reliability. Summary of the Invention

[0003] This invention provides a parachute detonation circuit and a drone, aiming to solve the problem of low reliability of current detonation circuits.

[0004] In a first aspect, the present invention provides a parachute detonation circuit for use in a drone. The parachute detonation circuit includes a detection circuit and a detonation circuit. The detection circuit includes a first connection terminal, a second connection terminal, and a voltage detection terminal. The first connection terminal and the second connection terminal are used to connect to the parachute detonator of the drone. The voltage detection terminal is connected to the control circuit of the drone and is used to output a detection voltage. The detonation circuit is connected to the parachute detonator and includes a first receiving terminal and a second receiving terminal. The first receiving terminal and the second receiving terminal are connected to the control circuit and are used to receive a first detonation signal and a second detonation signal output by the control circuit, respectively. When the detection circuit is connected to the parachute detonator and the detection voltage meets a preset threshold, the detonation circuit detonates the parachute detonator according to the first detonation signal and the second detonation signal.

[0005] Furthermore, the detonation circuit includes a primary switching circuit, an ignition circuit, and a secondary switching circuit; one end of the primary switching circuit is connected to the control circuit, and the other end of the primary switching circuit is connected to one end of the ignition circuit and one end of the secondary switching circuit, respectively; the other end of the ignition circuit and the other end of the secondary switching circuit are both connected to the detection circuit.

[0006] Furthermore, the first-stage switching circuit includes a first switching transistor, a first receiving terminal, and a second receiving terminal; the controlled electrode of the first switching transistor is connected to the first receiving terminal and the second receiving terminal respectively, the first electrode of the first switching transistor is connected to the first receiving terminal, and the second electrode of the first switching transistor is connected to the ignition circuit and the second-stage switching circuit respectively.

[0007] Furthermore, the first-stage switching circuit also includes a first resistor and a second resistor; one end of the first resistor is connected to the first receiving terminal, one end of the second resistor is connected to the second receiving terminal, and the other ends of the first resistor and the other ends of the second resistor are both connected to the controlled electrode of the first switching transistor.

[0008] Furthermore, the ignition circuit includes a second switching transistor and a relay; the controlled terminal of the second switching transistor is connected to the first-stage switching circuit, the first terminal of the second switching transistor is grounded, the second terminal of the second switching transistor is connected to one end of the relay, and the other end of the relay is connected to the parachute detonator.

[0009] Furthermore, the ignition circuit also includes a third resistor, a fourth resistor, a first diode, and a second diode; one end of the third resistor is connected to the first-stage switching circuit, and the other end of the third resistor is connected to one end of the fourth resistor and the controlled electrode of the second switching transistor, respectively, and the other end of the fourth resistor is grounded; the anode of the first diode is connected to the second electrode of the second switching transistor, and the cathode of the first diode is connected to the power supply terminal; the anode of the second diode is connected to the relay, and the cathode of the second diode is connected to the parachute detonator.

[0010] Furthermore, the secondary switching circuit includes a third switching transistor, the controlled terminal and the first terminal of the third switching transistor are both connected to the primary switching circuit, and the second terminal of the third switching transistor is connected to the parachute detonator.

[0011] Furthermore, the secondary switching circuit also includes a fifth resistor, a sixth resistor, a first capacitor, and a second capacitor; one end of the fifth resistor and one end of the first capacitor are both connected to the primary switching circuit, the other end of the fifth resistor is connected to one end of the sixth resistor and the controlled electrode of the third switching transistor, the other end of the first capacitor and the other end of the sixth resistor are both connected to the first electrode of the third switching transistor; one end of the second capacitor is connected to the second electrode of the third switching transistor, and the other end of the second capacitor is connected to the ignition circuit.

[0012] Furthermore, the detection circuit includes a seventh resistor, an eighth resistor, and a ninth resistor; one end of the seventh resistor is connected to the power supply battery of the UAV, and the other end of the seventh resistor is connected to the first connection terminal; one end of the eighth resistor is connected to the second connection terminal, and the other end of the eighth resistor and one end of the ninth resistor are both connected to the control circuit, and the other end of the ninth resistor is connected to the detonation circuit.

[0013] Secondly, the present invention provides an unmanned aerial vehicle (UAV) including a control circuit, a parachute detonator, and the parachute detonation circuit described in any one of the above-mentioned embodiments.

[0014] The parachute detonation circuit disclosed in this invention includes a control circuit, a parachute detonator, and a parachute detonation circuit. The parachute detonation circuit includes a detection circuit and a detonation circuit. The detection circuit includes a first connection terminal, a second connection terminal, and a voltage detection terminal. The first and second connection terminals are used to connect to the parachute detonator, and the voltage detection terminal is connected to the control circuit. The detonation circuit includes a first receiving terminal and a second receiving terminal. When both the first and second connection terminals are connected to the parachute detonator and the detection voltage output by the voltage detection terminal meets a preset threshold, the control circuit will output a control signal to the first and second receiving terminals to activate the detonation circuit. This ensures a stable connection between the parachute and the UAV and improves reliability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a block diagram of a parachute detonation circuit provided in an embodiment of the present invention;

[0017] Figure 2 This is a block diagram of a parachute detonation circuit provided in another embodiment of the present invention;

[0018] Figure 3 This is a circuit diagram of a parachute detonation circuit provided in an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0022] Furthermore, the directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying drawings and the product's usage state. Therefore, the directional terms used are for illustrating and understanding this invention, and not for limiting it. Additionally, in the accompanying drawings, structures that are similar or identical are indicated by the same reference numerals.

[0023] See Figures 1 to 3 , Figure 1 This is a block diagram of a parachute detonation circuit 100 provided in an embodiment of the present invention; Figure 2 This is a block diagram of a parachute detonation circuit 100 provided in another embodiment of the present invention; Figure 3 This is a circuit diagram of a parachute detonation circuit 100 provided in an embodiment of the present invention. Figure 1 As shown, the parachute detonation circuit 100 includes a detection circuit 10 and a detonation circuit 20. The detection circuit 10 includes a first connection terminal, a second connection terminal, and a voltage detection terminal. The first connection terminal and the second connection terminal are used to connect to the parachute detonator 300 of the UAV, and the voltage detection terminal is connected to the control circuit 200 of the UAV to output a detection voltage. The detonation circuit 20 is connected to the parachute detonator 300, and the detonation circuit 20 includes a first receiving terminal and a second receiving terminal. The first receiving terminal and the second receiving terminal are connected to the control circuit 200 to receive a first detonation signal and a second detonation signal output by the control circuit 200, respectively. When the detection circuit 10 is connected to the parachute detonator 300 and the detection voltage meets a preset threshold, the detonation circuit 20 detonates the parachute detonator 300 according to the first detonation signal and the second detonation signal.

[0024] Specifically, the drone may include a control circuit 200, a parachute detonator 300, and a parachute detonation circuit 100. The control circuit 200 is the core control module of the drone, which is mainly used to control the operation of the drone and, under certain conditions, to activate the parachute detonation circuit 100 to detonate the parachute detonator 300 and thus open the parachute.

[0025] The parachute detonation circuit 100 may include a detection circuit 10 and a detonation circuit 20. The detection circuit 10 is used to detect whether the parachute detonator 300 is properly connected to the detonation circuit 20, for example, whether the parachute detonator 300 is malfunctioning, or whether the parachute model is compatible. The detection circuit 10 may include a first connection terminal, a second connection terminal, and a voltage detection terminal. Both the first and second connection terminals are used to connect to the parachute detonator 300. When the first and second connection terminals are not connected to the parachute detonator 300, the detection circuit 10 is in a short-circuit state. When both the first and second connection terminals are connected to the parachute detonator 300, the detection circuit 10 is turned on. After the detection circuit 10 is turned on, the voltage detection terminal generates a detection voltage, which is output to the control circuit 200. The control circuit 200 determines the voltage magnitude of the detection circuit 10 based on the detection voltage. When the detection voltage matches a preset threshold, it indicates that the parachute detonator 300 is stably connected to the detection circuit 10 and the parachute model is compatible with the UAV. The preset threshold is an empirical value that is adjusted according to the model of the drone to adapt to different parachutes.

[0026] The detonation circuit 20 is connected to both the control circuit 200 and the parachute detonator 300. It is used to activate and detonate the parachute detonator 300 under the action of a control signal, thereby opening the parachute. The detonation circuit 20 may include a first receiving end and a second receiving end, both connected to the control circuit 200. Both ends are used to receive a first control signal and a second control signal output by the control circuit 200. For example, the first receiving end receives the first control signal, and the second receiving end receives the second control signal. When both ends receive the first and second control signals, the detonation circuit 20 is activated. Once activated, the parachute detonator 300 detonates, thus opening the parachute.

[0027] In practical use, the control circuit 200 determines whether the detonation circuit 20 needs to be activated based on preset logic. One of the preset logics is that the detection circuit 10 is activated and the detection voltage matches a preset threshold. Other preset logics could be that the detonation circuit 20 is activated when the drone is at risk of falling. In addition, a warning circuit can be provided to indicate whether the detection circuit 10 is activated, thereby facilitating early detection of whether the parachute is stably connected to the drone.

[0028] As a further embodiment, the detonation circuit 20 includes a primary switching circuit 21, an ignition circuit 22, and a secondary switching circuit 23; one end of the primary switching circuit 21 is connected to the control circuit 200, and the other end of the primary switching circuit 21 is connected to one end of the ignition circuit 22 and one end of the secondary switching circuit 23, respectively; the other ends of the ignition circuit 22 and the other ends of the secondary switching circuit 23 are both connected to the detection circuit 10.

[0029] The detonation circuit 20 may include a primary switching circuit 21, an ignition circuit 22, and a secondary switching circuit 23. The primary switching circuit 21 is used to connect the control circuit 200, the ignition circuit 22, and the diode switching circuit. The primary switching circuit 21 is used to verify the control signal; when a correct control signal is detected, the primary switching circuit 21 is turned on.

[0030] Ignition circuit 22 is connected to parachute detonator 300. Ignition circuit 22 is used to control the physical on / off state of the detonation circuit. When ignition circuit 22 is on, the main circuit is on. At the same time, secondary switch circuit 23 is also connected to parachute detonator 300. Secondary switch circuit 23 works in conjunction with ignition circuit 22 to ensure dual conduction of the detonation circuit. When secondary switch circuit 23 is on, detonation circuit 20 is on, and parachute detonator 300 is detonated.

[0031] See Figure 3 As a further embodiment, the first-stage switching circuit 21 includes a first switching transistor Q1, a first receiving terminal, and a second receiving terminal; the controlled electrode of the first switching transistor Q1 is connected to both the first receiving terminal and the second receiving terminal, the first electrode of the first switching transistor Q1 is connected to the first receiving terminal, and the second electrode of the first switching transistor Q1 is connected to both the ignition circuit 22 and the second-stage switching circuit 23. Further, the first-stage switching circuit 21 also includes a first resistor R1 and a second resistor R2; one end of the first resistor R1 is connected to the first receiving terminal, one end of the second resistor R2 is connected to the second receiving terminal, and the other ends of both the first resistor R1 and the second resistor R2 are connected to the controlled electrode of the first switching transistor Q1.

[0032] The primary switching circuit 21 includes a first switching transistor Q1, a first receiving terminal, and a second receiving terminal. The first switching transistor Q1 can be a MOSFET, with its gate connected to both the first and second receiving terminals. Its source is connected to the first receiving terminal, and its drain is connected to both the ignition circuit 22 and the secondary switching circuit 23. The first switching transistor Q1 conducts when both its gate and source receive a first control signal and a second control signal simultaneously. For example, the first control signal can be a high-level signal, and the second control signal can be a low-level signal. Therefore, when the first receiving terminal receives a high-level signal and the second receiving terminal receives a low-level signal, the first switching transistor Q1 conducts. Once the first switching transistor Q1 is turned on, the ignition circuit 22 and the secondary switching circuit 23 are also connected. A first resistor R1 is connected to both the first receiving terminal and the gate of the first switching transistor Q1 to provide current limiting protection for Q1, preventing overcurrent damage. The second resistor R2 is connected to the gate of the second receiver and the gate of the first switch Q1, respectively, to stabilize the level and prevent accidental parachute detonation caused by level fluctuations.

[0033] like Figure 3 As shown, Figure 3 MCU_EN1 is the first control signal and MCU_EN2 is the second control signal. When MCU_EN1 is a high-level signal and MCU_EN2 is a low-level signal, the first switch Q1 is turned on.

[0034] In a further embodiment, the ignition circuit 22 includes a second switch Q2 and a relay K1; the controlled terminal of the second switch Q2 is connected to the first-stage switching circuit 21, the first terminal of the second switch Q2 is grounded, the second terminal of the second switch Q2 is connected to one end of the relay K1, and the other end of the relay K1 is connected to the parachute initiator 300. Further, the ignition circuit 22 also includes a third resistor R3, a fourth resistor R4, a first diode D1, and a second diode D2; one end of the third resistor R3 is connected to the first-stage switching circuit 21, and the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and the controlled terminal of the second switch Q2, respectively, and the other end of the fourth resistor R4 is grounded; the anode of the first diode D1 is connected to the second terminal of the second switch Q2, and the cathode of the first diode D1 is connected to the power supply terminal; the anode of the second diode D2 is connected to the relay K1, and the cathode of the second diode D2 is connected to the parachute initiator 300.

[0035] The ignition circuit 22 may include a second switching transistor Q2 and a relay K1. The second switching transistor Q2 can be a transistor, with its base connected to the first-stage switching circuit 21 via a third resistor R3. The emitter of the second switching transistor Q2 is grounded, and its collector is connected to the relay K1. The third resistor R3 is connected between the first-stage switching circuit 21 and the base of the second switching transistor Q2 to provide current-limiting protection for Q2. The fourth resistor R4 is a pull-down resistor to prevent misfires in Q2. The relay K1 is connected to the parachute detonator 300 via a second diode D2. The second diode D2 is unidirectionally conductive to prevent reverse current in the detonation circuit. Furthermore, the anode of the first diode D1 is connected to the collector of the second switching transistor Q2, and the first diode D1 is connected in reverse parallel with the relay K1, acting as a freewheeling diode to protect the relay K1.

[0036] like Figure 3 As shown, the second switch Q2 can be connected to the drain of the first switch Q1 through the third resistor R3. When the first switch Q1 is turned on, the second switch Q2 is turned on, and then the 3rd and 6th pins, as well as the 4th and 5th pins of the relay K1 are turned on, and the detonation main circuit is turned on.

[0037] In a further embodiment, the secondary switching circuit 23 includes a third switching transistor Q3. The controlled terminal and the first terminal of the third switching transistor Q3 are both connected to the primary switching circuit 21, and the second terminal of the third switching transistor Q3 is connected to the parachute initiator 300. Further, the secondary switching circuit 23 also includes a fifth resistor R5, a sixth resistor R6, a first capacitor C1, and a second capacitor C2. One end of the fifth resistor R5 and one end of the first capacitor C1 are both connected to the primary switching circuit 21. The other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the controlled terminal of the third switching transistor Q3. The other ends of the first capacitor C1 and the sixth resistor R6 are both connected to the first terminal of the third switching transistor Q3. One end of the second capacitor C2 is connected to the second terminal of the third switching transistor Q3, and the other end of the second capacitor C2 is connected to the ignition circuit 22.

[0038] The secondary switching circuit 23 may include a third switching transistor Q3, which may be a MOSFET. The gate of Q3 is connected to the primary switching circuit 21 via a fifth resistor R5, its source is grounded, and its drain is connected to the parachute detonator 300. The fifth resistor R5 acts as a current resistor to protect Q3, and the sixth resistor R6 acts as a pull-down resistor to prevent Q3 from mis-energizing. The first capacitor C1 filters out noise to prevent interference-induced activation. The second capacitor C2 is connected between the ignition circuit 22 and the third switching transistor Q3 to stabilize the detonation voltage.

[0039] like Figure 3 As shown, the third switch Q3 is connected to the first switch Q1 through the fifth resistor R5. When the first switch Q1 is turned on, the third switch Q3 is turned on. Furthermore, when relay K1 is de-energized, pins 2 and 7, and pins 3 and 6 are energized, while pins 4 and 5, and pins 3 and 6 are open. Therefore, at the moment the drone inserts the battery, even if the first switch Q1 and the third switch Q3 are slightly turned on due to unstable voltage levels or other interference, the instantaneous insufficient current will cause pins 4 and 5, and pins 3 and 6 of relay K1 to energize, thus preventing accidental explosions caused by unstable voltage levels at the moment the drone inserts the battery.

[0040] Figure 3 The 1P battery serves as the power source for the parachute detonator 300. The 1P battery is the voltage of the first cell of the 4S battery. It does not pass through any DC-DC or LDO power chips, which can avoid the problem of power failure and failure to detonate due to chip failure. As long as the battery is still there, there is enough current to detonate the parachute.

[0041] As a further embodiment, the detection circuit 10 includes a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9; one end of the seventh resistor R7 is connected to the power supply battery of the UAV, and the other end of the seventh resistor R7 is connected to the first connection terminal; one end of the eighth resistor R8 is connected to the second connection terminal, and the other end of the eighth resistor R8 and one end of the ninth resistor R9 are both connected to the control circuit 200, and the other end of the ninth resistor R9 is connected to the detonation circuit 20.

[0042] The detection circuit 10 may include a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. When the detection circuit 10 is not connected to the parachute detonator 300, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 do not form a loop, and the detection circuit 10 is in an open circuit state. When the detection circuit 10 is connected to the parachute detonator 300, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 form a voltage divider circuit, and the voltage detection terminal outputs the detection voltage.

[0043] like Figure 3 As shown, JLS_ADC is a pin of control circuit 200. When the detected voltage is 0V, detection circuit 10 is not connected to parachute initiator 300. When the detected voltage is around 1V (the preset threshold is 1V), detection circuit 10 is connected to a parachute with the correct signal. If the detected voltage is any other voltage and deviates significantly from 1V, it indicates that the inserted parachute initiator 300 is malfunctioning or the parachute model is incorrect. This effectively detects whether the parachute is in normal condition before the drone takes off.

[0044] The present invention also provides an unmanned aerial vehicle (UAV), the UAV including a control circuit 200, a parachute detonator 300, and a parachute detonation circuit 100 as described in any of the above embodiments; the parachute detonation circuit 100 includes a detection circuit 10 and a detonation circuit 20; the detection circuit 10 includes a first connection terminal, a second connection terminal, and a voltage detection terminal, the first connection terminal and the second connection terminal being used to connect to the parachute detonator 300 of the UAV, and the voltage detection terminal being connected to the control circuit 200 of the UAV for outputting a detection voltage; the detonation circuit 20 is connected to the parachute detonator 300, and the detonation circuit 20 includes a first receiving terminal and a second receiving terminal, the first receiving terminal and the second receiving terminal being connected to the control circuit 200 for receiving a first detonation signal and a second detonation signal output by the control circuit 200, respectively; wherein, when the detection circuit 10 is connected to the parachute detonator 300 and the detection voltage meets a preset threshold, the detonation circuit 20 detonates the parachute detonator 300 according to the first detonation signal and the second detonation signal.

[0045] Specifically, the drone may include a control circuit 200, a parachute detonator 300, and a parachute detonation circuit 100. The control circuit 200 is the core control module of the drone, which is mainly used to control the operation of the drone and, under certain conditions, to activate the parachute detonation circuit 100 to detonate the parachute detonator 300 and thus open the parachute.

[0046] The parachute detonation circuit 100 may include a detection circuit 10 and a detonation circuit 20. The detection circuit 10 is used to detect whether the parachute detonator 300 is properly connected to the detonation circuit 20, for example, whether the parachute detonator 300 is malfunctioning, or whether the parachute model is compatible. The detection circuit 10 may include a first connection terminal, a second connection terminal, and a voltage detection terminal. Both the first and second connection terminals are used to connect to the parachute detonator 300. When the first and second connection terminals are not connected to the parachute detonator 300, the detection circuit 10 is in a short-circuit state. When both the first and second connection terminals are connected to the parachute detonator 300, the detection circuit 10 is turned on. After the detection circuit 10 is turned on, the voltage detection terminal generates a detection voltage, which is output to the control circuit 200. The control circuit 200 determines the voltage magnitude of the detection circuit 10 based on the detection voltage. When the detection voltage matches a preset threshold, it indicates that the parachute detonator 300 is stably connected to the detection circuit 10 and the parachute model is compatible with the UAV. The preset threshold is an empirical value that is adjusted according to the model of the drone to adapt to different parachutes.

[0047] The detonation circuit 20 is connected to both the control circuit 200 and the parachute detonator 300. It is used to activate and detonate the parachute detonator 300 under the action of a control signal, thereby opening the parachute. The detonation circuit 20 may include a first receiving end and a second receiving end, both connected to the control circuit 200. Both ends are used to receive a first control signal and a second control signal output by the control circuit 200. For example, the first receiving end receives the first control signal, and the second receiving end receives the second control signal. When both ends receive the first and second control signals, the detonation circuit 20 is activated. Once activated, the parachute detonator 300 detonates, thus opening the parachute.

[0048] In practical use, the control circuit 200 determines whether the detonation circuit 20 needs to be activated based on preset logic. One of the preset logics is that the detection circuit 10 is activated and the detection voltage matches a preset threshold. Other preset logics could be that the detonation circuit 20 is activated when the drone is at risk of falling. In addition, a warning circuit can be provided to indicate whether the detection circuit 10 is activated, thereby facilitating early detection of whether the parachute is stably connected to the drone.

[0049] The parachute detonation circuit and drone disclosed in this invention will only output a control signal to the first and second receiving terminals to activate the detonation circuit when both the first and second connecting terminals are connected to the parachute detonator and the detection voltage output by the voltage detection terminal meets the preset threshold. This ensures a stable connection between the parachute and the drone and improves reliability.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A parachute detonation circuit, characterized in that, Applied to drones, the parachute detonation circuit includes: The detection circuit includes a first connection terminal, a second connection terminal, and a voltage detection terminal. The first connection terminal and the second connection terminal are used to connect to the parachute detonator of the UAV, and the voltage detection terminal is connected to the control circuit of the UAV to output a detection voltage. The detonation circuit is connected to the parachute detonator, and the detonation circuit includes a first receiving end and a second receiving end, which are connected to the control circuit for receiving the first detonation signal and the second detonation signal output by the control circuit, respectively. When the detection circuit is connected to the parachute detonator and the detection voltage meets a preset threshold, the detonation circuit detonates the parachute detonator according to the first detonation signal and the second detonation signal. The detonation circuit includes a primary switching circuit, an ignition circuit, and a secondary switching circuit. One end of the first-level switching circuit is connected to the control circuit, and the other end of the first-level switching circuit is connected to one end of the ignition circuit and one end of the second-level switching circuit, respectively. The other end of the ignition circuit and the other end of the secondary switch circuit are both connected to the detection circuit.

2. The parachute detonation circuit as described in claim 1, characterized in that, The first-stage switching circuit includes a first switching transistor, a first receiving terminal, and a second receiving terminal; The controlled electrode of the first switching transistor is connected to the first receiving terminal and the second receiving terminal, respectively. The first electrode of the first switching transistor is connected to the first receiving terminal, and the second electrode of the first switching transistor is connected to the ignition circuit and the secondary switching circuit, respectively.

3. The parachute detonation circuit as described in claim 2, characterized in that, The primary switching circuit also includes a first resistor and a second resistor; One end of the first resistor is connected to the first receiving end, one end of the second resistor is connected to the second receiving end, and the other ends of the first resistor and the other ends of the second resistor are both connected to the controlled electrode of the first switching transistor.

4. The parachute detonation circuit as described in claim 1, characterized in that, The ignition circuit includes a second switching transistor and a relay; The controlled terminal of the second switching transistor is connected to the first-stage switching circuit, the first terminal of the second switching transistor is grounded, the second terminal of the second switching transistor is connected to one end of the relay, and the other end of the relay is connected to the parachute detonator.

5. The parachute detonation circuit as described in claim 4, characterized in that, The ignition circuit also includes a third resistor, a fourth resistor, a first diode, and a second diode; One end of the third resistor is connected to the first-stage switching circuit, and the other end of the third resistor is connected to one end of the fourth resistor and the controlled electrode of the second switching transistor, respectively. The other end of the fourth resistor is grounded. The positive terminal of the first diode is connected to the second terminal of the second switching transistor, and the negative terminal of the first diode is connected to the power supply terminal. The positive terminal of the second diode is connected to the relay, and the negative terminal of the second diode is connected to the parachute detonator.

6. The parachute detonation circuit as described in claim 1, characterized in that, The secondary switching circuit includes a third switching transistor. The controlled electrode and the first electrode of the third switching transistor are both connected to the primary switching circuit, and the second electrode of the third switching transistor is connected to the parachute detonator.

7. The parachute detonation circuit as described in claim 6, characterized in that, The secondary switching circuit also includes a fifth resistor, a sixth resistor, a first capacitor, and a second capacitor; One end of the fifth resistor and one end of the first capacitor are both connected to the first-stage switching circuit. The other end of the fifth resistor is connected to one end of the sixth resistor and the controlled electrode of the third switching transistor, respectively. The other end of the first capacitor and the other end of the sixth resistor are both connected to the first electrode of the third switching transistor. One end of the second capacitor is connected to the second terminal of the third switching transistor, and the other end of the second capacitor is connected to the ignition circuit.

8. The parachute detonation circuit as described in claim 1, characterized in that, The detection circuit includes a seventh resistor, an eighth resistor, and a ninth resistor; One end of the seventh resistor is connected to the power supply battery of the drone, and the other end of the seventh resistor is connected to the first connection end; One end of the eighth resistor is connected to the second connection end, the other end of the eighth resistor and one end of the ninth resistor are both connected to the control circuit, and the other end of the ninth resistor is connected to the detonation circuit.

9. A drone, characterized in that, The drone includes a control circuit, a parachute detonator, and a parachute detonation circuit as described in any one of claims 1-8.

Images