Parachute driving circuit, ignition device and driving method suitable for small unmanned aerial vehicle

Abstract

The invention discloses a parachute driving circuit, an ignition device and a driving method suitable for a small unmanned aerial vehicle, and the parachute driving circuit comprises a plugging module which is used for plugging an igniter integrated with a parachute; one end of the detection module is connected with the plug-in module, and the other end of the detection module is used for being connected with an MCU module; one end of the anti-interference module is connected with the detection module, and the other end of the anti-interference module is used for being connected with the MCU module; wherein the ignition state of the igniter can be detected through the MCU module according to the divided voltage in the detection module, and the igniter can be prevented from being mistakenly triggered through the MCU module according to the two enable levels in the anti-interference module. The reliability of the parachute driving circuit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of drones, and particularly to a parachute drive circuit, an ignition device and a drive method applicable to small drones. Background Art

[0002] A drone is an unmanned aircraft, which can be divided into single drones and swarm drones according to the quantity. Swarm drones are a current research hotspot. At present, the new national standard also requires that small drones must be equipped with parachutes to avoid casualties caused by falling in urban areas.

[0003] A parachute igniter is in nature close to a 2-ohm resistor. After current flows through it, it will generate heat, and the heat generates temperature. When the temperature reaches the ignition point of the chemical, the igniter will be quickly ignited, generating an instant high temperature, which can rapidly expand the air and pop open the parachute folded into a small volume. After being popped open, the parachute will automatically expand into the maximum area and the set shape by using the airflow of the falling object. One of the risks of the parachute is that the igniter integrated with the parachute is accidentally triggered at the wrong time or the igniter cannot be triggered when the parachute needs to be opened, that is, the reliability of the drive circuit of the parachute in the prior art is relatively low.

[0004] Therefore, to solve the above problems, the present invention provides a parachute drive circuit, an ignition device and a drive method applicable to small drones with relatively high reliability. Summary of the Invention

[0005] The present invention provides a parachute drive circuit, an ignition device and a drive method applicable to small drones, aiming to solve the problem of relatively low reliability of the existing parachute drive circuit.

[0006] To solve the above technical problems, in the first aspect of the present invention, a parachute drive circuit applicable to small drones is provided, which includes: a plug-in module for plugging in an igniter integrated with a parachute; a detection module, one end of which is connected to the plug-in module and the other end is used to be connected to an MCU module; an anti-interference module, one end of which is connected to the detection module and the other end is used to be connected to the MCU module; wherein, according to the divided voltage in the detection module, the ignition state of the igniter can be detected through the MCU module, and according to the two enable levels in the anti-interference module, the mis-triggering of the igniter can be prevented through the MCU module.

[0007] Further, the detection module includes a sixth NMOS transistor, the drain of the sixth NMOS transistor is used to be connected to the igniter and the MCU module, the gate of the sixth NMOS transistor is connected to the anti-interference module, and the source of the sixth NMOS transistor is grounded.

[0008] Further, the detection module further includes a sixth resistor and a seventh resistor. One end of the sixth resistor is grounded, and the other end is connected to one end of the seventh resistor. The other end of the seventh resistor is connected to the igniter and the drain of the sixth NMOS transistor. The MCU module is connected between the sixth resistor and the seventh resistor to obtain the divided voltage.

[0009] Further, the anti-interference module includes a fifth PMOS transistor. The source and gate of the fifth PMOS transistor are used to be connected to the MCU module to obtain the two enable levels. The drain of the fifth PMOS transistor is connected to the detection module.

[0010] Further, the anti-interference module further includes a thirteenth resistor. One end of the thirteenth resistor is connected to the drain of the fifth PMOS transistor, and the other end is grounded.

[0011] Further, the anti-interference module further includes a twelfth resistor and an eighteenth resistor. One end of the twelfth resistor is used to be connected to the first enable terminal of the MCU module to obtain the first enable level, and the other end is connected to one end of the eighteenth resistor. The other end of the eighteenth resistor is used to be connected to the second enable terminal of the MCU module to obtain the second enable level. The gate of the fifth PMOS transistor is connected between the twelfth resistor and the eighteenth resistor.

[0012] Further, the plug-in module includes a plug-in component. The first pin and the second pin of the plug-in component are used to plug the igniter.

[0013] In a second aspect of the present invention, a parachute ignition device is further provided. The parachute ignition device includes an MCU module, an igniter, and the above-mentioned parachute driving circuit applicable to a small unmanned aerial vehicle. The igniter is plugged on the plug-in module in the parachute driving circuit, and the MCU module is connected to the parachute driving circuit.

[0014] In a third aspect of the present invention, a parachute driving method is further provided, which includes: if the obtained divided voltage is greater than a preset voltage, it is determined that the igniter is normally installed; an ignition signal is sent to the parachute driving circuit to turn on the sixth NMOS transistor; if it is detected that the divided voltage is pulled down to the preset voltage, it is determined that the igniter has successfully ignited.

[0015] Further, control the first enable level to be a high level and the second enable level to be a low level to turn on the fifth PMOS transistor.

[0016] The parachute drive circuit, ignition device and drive method for small unmanned aerial vehicles disclosed by the present invention can detect the ignition state of the igniter through the MCU module according to the divided voltage in the detection module by inserting the igniter integrated with the parachute into the plug-in module, and can prevent the misfiring of the igniter through the MCU module according to the two enable levels in the anti-interference module, thereby improving the reliability of the parachute drive circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a block diagram of a parachute drive circuit for small unmanned aerial vehicles provided by an embodiment of the present invention;

[0019] Figure 2 is a circuit schematic diagram of a parachute drive circuit for small unmanned aerial vehicles provided by an embodiment of the present invention;

[0020] Figure 3 is a block diagram of a parachute ignition device provided by an embodiment of the present invention;

[0021] Figure 4 is a flowchart of a parachute drive method provided by an embodiment of the present invention;

[0022] Reference numerals: 10, parachute drive circuit; 11, plug-in module; 12, detection module; 13, anti-interference module; Q6, sixth NMOS transistor; R6, sixth resistor; R7, seventh resistor; Q5, fifth PMOS transistor; R13, thirteenth resistor; R12, twelfth resistor; R18, eighteenth resistor; 100, parachute ignition device; 20, MCU module; 30, igniter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] 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, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups.

[0025] It should also be understood that the terminology used in this specification of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in this specification of the present invention and the appended claims, unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0026] It should be further understood that the term "and / or" used in this specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] Figures 1 to 2 An embodiment of a parachute drive circuit applicable to a small unmanned aerial vehicle provided by the present invention is shown. The parachute drive circuit 10 applicable to a small unmanned aerial vehicle in this embodiment includes a plug-in module 11, a detection module 12, and an anti-interference module 13. Among them, the plug-in module 11 is used to plug in an igniter 30 integrated with the parachute; one end of the detection module 12 is connected to the plug-in module 11, and the other end is used to be connected to an MCU module 20; one end of the anti-interference module 13 is connected to the detection module 12, and the other end is used to be connected to the MCU module 20; wherein, according to the voltage division voltage in the detection module 12, the ignition state of the igniter 30 can be detected through the MCU module 20, and according to the two enable levels in the anti-interference module 13, the MCU module 20 can prevent the igniter 30 from being accidentally triggered. It should be noted that in this embodiment, by plugging the igniter 30 integrated with the parachute into the plug-in module 11, according to the voltage division voltage in the detection module 12, the ignition state of the igniter 30 can be detected through the MCU module 20, and according to the two enable levels in the anti-interference module 13, the MCU module 20 can prevent the igniter 30 from being accidentally triggered, thereby improving the reliability of the parachute drive circuit 10.

[0028] Please refer to Figure 2, in one embodiment, such as this embodiment, the detection module 12 includes a sixth NMOS transistor Q6. The drain of the sixth NMOS transistor Q6 is used to connect to the igniter 30 and the MCU module 20. The gate of the sixth NMOS transistor Q6 is connected to the anti-interference module 13, and the source of the sixth NMOS transistor Q6 is grounded. It should be noted that in this embodiment, a single lithium-ion battery is selected for power supply, and the sixth NMOS transistor Q6 is used to control the ignition of the igniter 30. Understandably, in this embodiment, the reason for selecting a single lithium-ion battery for power supply instead of considering a constant voltage source or a constant current source drive is that the voltage of a single lithium-ion battery is about 3 to 4.2V. For the igniter 30 with a 2R resistor, it can generate a current of 1.5 to 2A, which is sufficient to ignite the igniter 30, while a constant voltage source or a constant current source drive will occupy space on the drone and increase the weight of the drone. It should also be noted that in this embodiment, the plug-in module 11 includes a plug-in component. The first pin and the second pin of the plug-in component are used to plug the igniter 30, that is, the igniter 30 is connected between the first pin and the second pin of the plug-in component, that is, the igniter 30 is connected between 1P and Igniter-. The positive electrode of the single lithium-ion battery is connected to the first pin of the plug-in component, and the negative electrode of the single lithium-ion battery is grounded. Specifically, as Figure 2 shown, the ground terminal is PACK-, that is, the positive electrode of the single lithium-ion battery is connected to 1P, and the negative electrode of the single lithium-ion battery is connected to PACK-. Understandably, a loop of the positive electrode of the single lithium-ion battery - igniter 30 - sixth NMOS transistor Q6 - ground is formed. When the sixth NMOS transistor Q6 is turned on, the igniter 30 will ignite when it is powered on.

[0029] Please refer to Figure 2 , in one embodiment, such as this embodiment, the detection module 12 further includes a sixth resistor R6 and a seventh resistor R7. One end of the sixth resistor R6 is grounded, and the other end is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to the igniter 30 and the drain of the sixth NMOS transistor Q6. The MCU module 20 is connected between the sixth resistor R6 and the seventh resistor R7 to obtain the divided voltage. Specifically, as Figure 2As shown, through the voltage division of the sixth resistor R6 and the seventh resistor R7, the MCU module 20 can obtain the divided voltage Igniter_V, and the divided voltage Igniter_V is connected to the ADC sampling pin of the MCU module 20. If there is a voltage in the divided voltage Igniter_V, that is, the voltage value of the divided voltage Igniter_V is greater than 0V, when the igniter 30 does not perform ignition, the MCU module 20 can determine that the igniter 30 is installed normally. If the voltage value of the divided voltage Igniter_V is 0V, when the igniter 30 does not perform ignition, the MCU module 20 can determine that the igniter 30 is not installed. It should be noted that in this embodiment, when the igniter 30 is installed normally and ignition needs to be performed, the sixth NMOS transistor Q6 will conduct, thereby pulling down the voltage at the igniter- as shown in Figure 2 in Figure 2 , that is, the Igniter_V voltage will be pulled down to 0V. At this time, the MCU module 20 determines that the ignition of the igniter 30 is successful. It should also be noted that in this embodiment, if the sixth NMOS transistor Q6 is damaged, it will always be in an open circuit. When ignition is performed, the Igniter_V voltage will never be pulled down to 0V, which can be detected by the MCU module 20. Understandably, if the sixth NMOS transistor Q6 is in a short circuit, Igniter_V will always be pulled down and conduct, and the power will be continuously consumed. Even if no ignition signal is given, Igniter_V will also be pulled down and conduct, which can also be detected by the MCU module 20. That is, through the divided voltage Igniter_V in the detection module 12, the MCU module 20 can detect the ignition state of the igniter 30, and the ignition state includes whether ignition has been performed and whether the ignition is successful.

[0030] Please refer to Figure 2, in an embodiment, such as this embodiment, the anti-interference module 13 includes a fifth PMOS transistor Q5. The source and gate of the fifth PMOS transistor Q5 are used to connect to the MCU module 20 to obtain the two enable levels, and the drain of the fifth PMOS transistor Q5 is connected to the detection module 12. Specifically, the drain of the fifth PMOS transistor Q5 is connected to the gate of the sixth NMOS transistor Q6. More specifically, the anti-interference module 13 further includes a thirteenth resistor R13. One end of the thirteenth resistor R13 is connected to the drain of the fifth PMOS transistor Q5, and the other end is grounded. The anti-interference module 13 further includes a twelfth resistor R12 and an eighteenth resistor R18. One end of the twelfth resistor R12 is used to connect to the first enable terminal of the MCU module 20 to obtain the first enable level, and the other end is connected to one end of the eighteenth resistor R18. The other end of the eighteenth resistor R18 is used to connect to the second enable terminal of the MCU module 20 to obtain the second enable level; the gate of the fifth PMOS transistor Q5 is connected between the twelfth resistor R12 and the eighteenth resistor R18. It should be noted that in this embodiment, the thirteenth resistor R13 can prevent the sixth NMOS transistor Q6 from being accidentally triggered by external interference. The source and gate of the fifth PMOS transistor Q5 are respectively connected to two IO ports of the MCU module 20. The two IO ports are the first IO port and the second IO port. The level on the first IO port is the first enable level, and the level on the second IO port is the second enable level. The first enable level is Igniter_EN1, and the second enable level is Igniter_EN2. When the first enable level Igniter_EN1 is higher than the second enable level Igniter_EN2, the fifth PMOS transistor Q5 will conduct. Through the anti-interference module 13, it is possible to prevent the igniter 30 from being accidentally triggered when a single IO port is abnormal. It should also be noted that in this embodiment, the first enable level Igniter_EN1, the second enable level Igniter_EN2, and the fifth PMOS form an enable circuit. The first IO port is EN1, the second IO port is EN2, EN2 is the enable pin, and it is enabled by a low level. EN1 is the main control pin. Only when EN2 is at a low level and EN1 is at a high level, the fifth PMOS transistor Q5 conducts. In the other three cases, the fifth PMOS transistor Q5 does not conduct. The other three cases are that both EN1 and EN2 are at a low level, both EN1 and EN2 are at a high level, and EN1 is at a low level and EM2 is at a high level. Understandably, if EN1 and EN2 are connected to IO ports of the same nature, for example, on the same group of IOs. The IOs of the MCU module 20 are generally divided into groups of 8, such as PA0~PA7, PB0~PB7, etc. The IO ports in the same group are generally in the same state during the power-on state or the programming state. Through this anti-interference module 13, it will not be accidentally triggered when the two IOs are both at a high level and both at a low level, improving the reliability.

[0031] In one embodiment, such as this embodiment, a parachute ignition device 100 is further provided. Please refer to Figure 3 , the parachute ignition device 100 includes an MCU module 20, an igniter 30, and the parachute drive circuit 10 applicable to a small unmanned aerial vehicle as described above. The igniter 30 is plugged into the plug-in module 11 in the parachute drive circuit 10, and the MCU module 20 is connected to the parachute drive circuit 10. Understandably, in practical applications, the igniter 30 integrated with the parachute is plugged into the plug-in module 11 of the parachute drive circuit 10. The first IO port and the second IO port of the MCU module 20 are respectively connected to the source and the gate of the fifth PMOS transistor Q5 in the anti-interference module 13 in the parachute drive circuit 10. The ADC sampling pin on the MCU module 20 is connected to the drain of the sixth NMOS transistor Q6. According to the divided voltage in the detection module 12, the ignition state of the igniter 30 can be detected through the ADC sampling pin in the MCU module 20. According to the first enable level and the second enable level in the anti-interference module 13, the first IO port and the second IO port can prevent the igniter 30 from being mis-triggered.

[0032] Referring to Figure 4 , Figure 4 is a schematic flowchart of a parachute drive method provided in an embodiment of the present invention. This parachute drive method is applied to the MCU module in the above-mentioned parachute ignition device. The following further elaborates the specific implementation steps of the parachute drive method of the present invention with this method. As Figure 4 shown, this method includes steps S110 - S130:

[0033] S110. If the obtained divided voltage is greater than the preset voltage, it is determined that the igniter is normally installed;

[0034] S120. Send an ignition signal to the parachute drive circuit to turn on the sixth NMOS transistor;

[0035] S130. If it is detected that the divided voltage is pulled down to the preset voltage, it is determined that the igniter has been successfully ignited.

[0036] In an embodiment of the present invention, the MCU module obtains the divided voltage on the detection module in the parachute drive circuit and determines whether the divided voltage is greater than a preset voltage, where the preset voltage is 0V; if the divided voltage is greater than the preset voltage, it is determined that the igniter is installed normally; understandably, if the divided voltage is equal to the preset voltage, it is determined that the igniter is not installed or installed abnormally; after it is determined that the igniter is installed normally, an ignition signal is sent to the parachute drive circuit to turn on the sixth NMOS transistor; if the MCU module detects that the divided voltage is pulled down to the preset voltage, it is determined that the igniter has ignited successfully; conversely, if it is detected that the divided voltage is not pulled down to the preset voltage, it is determined that the igniter has failed to ignite.

[0037] It should be noted that in this embodiment, after the step of determining that the igniter is installed normally if the obtained divided voltage is greater than the preset voltage, it further includes: controlling the first enable level to be high level and the second enable level to be low level to turn on the fifth PMOS transistor. After the fifth PMOS transistor is turned on, the thirteenth resistor, which is a pull-down resistor, can prevent the sixth NMOS transistor from being accidentally triggered by external interference. Understandably, when the first enable level and the second enable level are both high level, both low level, or the first enable level is low level and the second enable level is high level, the fifth PMOS transistor will not be turned on, improving the reliability of the parachute drive circuit.

[0038] The parachute drive circuit, ignition device and drive method applicable to small unmanned aerial vehicles provided by the present invention, wherein the parachute drive circuit plugs an igniter integrated with the parachute into the plug-in module, and the MCU module can detect the ignition state of the igniter according to the divided voltage in the detection module, and the MCU module can prevent the igniter from being accidentally triggered according to the two enable levels in the anti-interference module, thereby improving the reliability of the parachute drive circuit. Specifically, the present invention can detect whether the igniter is installed normally and whether the ignition is successful through the ADC sampling pin of the MCU module according to the divided voltage between the sixth resistor and the seventh resistor; the reliability of the parachute drive circuit can be improved through the first enable level, the second enable level, the first IO port and the second IO port in the MCU module and the thirteenth resistor. The parachute drive circuit applicable to small unmanned aerial vehicles disclosed by the present invention solves the problem of low reliability of the existing parachute drive circuit.

[0039] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A parachute drive circuit applicable to small unmanned aerial vehicles, characterized in that, Comprising: A plugging module for plugging an igniter integrated with a parachute; A detection module, one end of which is connected to the plugging module and the other end is for connecting to an MCU module; An anti-interference module, one end of which is connected to the detection module and the other end is for connecting to the MCU module; Wherein, the ignition state of the igniter can be detected by the MCU module according to the divided voltage in the detection module, and the mis-triggering of the igniter can be prevented by the MCU module according to the two enable levels in the anti-interference module.

2. The parachute drive circuit applicable to small unmanned aerial vehicles according to claim 1, characterized in that The detection module includes a sixth NMOS transistor, the drain of the sixth NMOS transistor is for connecting to the igniter and the MCU module, the gate of the sixth NMOS transistor is connected to the anti-interference module, and the source of the sixth NMOS transistor is grounded.

3. The parachute driving circuit for small unmanned aerial vehicles according to claim 2, characterized in that The detection module further includes a sixth resistor and a seventh resistor, one end of the sixth resistor is grounded, the other end is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to the igniter and the drain of the sixth NMOS transistor, and the MCU module is connected between the sixth resistor and the seventh resistor to obtain the divided voltage.

4. The parachute drive circuit applicable to small unmanned aerial vehicles according to claim 1, wherein The anti-interference module includes a fifth PMOS transistor, the source and gate of the fifth PMOS transistor are for connecting to the MCU module to obtain the two enable levels, and the drain of the fifth PMOS transistor is connected to the detection module.

5. The parachute drive circuit applicable to small unmanned aerial vehicles according to claim 4, wherein The anti-interference module further includes a thirteenth resistor, one end of the thirteenth resistor is connected to the drain of the fifth PMOS transistor and the other end is grounded.

6. The parachute drive circuit applicable to small unmanned aerial vehicles according to claim 4, characterized in that, The anti-interference module further includes a twelfth resistor and an eighteenth resistor, one end of the twelfth resistor is for connecting to the first enable terminal of the MCU module to obtain a first enable level, the other end is connected to one end of the eighteenth resistor, and the other end of the eighteenth resistor is for connecting to the second enable terminal of the MCU module to obtain a second enable level; The gate of the fifth PMOS transistor is connected between the twelfth resistor and the eighteenth resistor.

7. The parachute driving circuit applicable to small unmanned aerial vehicles according to claim 1, wherein The plugging module includes a plugging member, and the first pin and the second pin of the plugging member are for plugging the igniter.

8. A parachute ignition device, characterized in that, The parachute ignition device includes an MCU module, an igniter, and the parachute driving circuit for a small unmanned aerial vehicle according to any one of claims 1-7. The igniter is plugged on the plugging module in the parachute driving circuit, and the MCU module is connected to the parachute driving circuit.

9. A parachute driving method, applied to the MCU module in the parachute ignition device as described in claim 8, characterized in that, Comprising: If the obtained divided voltage is greater than a preset voltage, it is determined that the igniter is normally installed; Sending an ignition signal to the parachute driving circuit to turn on the sixth NMOS transistor; If it is detected that the divided voltage is pulled down to the preset voltage, it is determined that the igniter has been successfully ignited.

10. The parachute igniter driving method according to claim 9, characterized in that, After the step of if the obtained divided voltage is greater than the preset voltage, it is determined that the igniter is normally installed, further including: Controlling the first enable level to be high level and the second enable level to be low level to turn on the fifth PMOS transistor.

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