Unmanned aerial vehicle ignition system and device

Abstract

The utility model discloses an ignition system and device for an unmanned aerial vehicle. The ignition system comprises an input interface module, a power conversion module, a control module, a communication module, an ignition switch module and an output interface module, the ignition switch module comprises an ignition main switch, a first ignition switch and a second ignition switch, and the first ignition switch and the second ignition switch are both CMOS type switches. The control module controls on-off of the ignition main switch according to a safety control signal transmitted by the input interface module and then controls on-off of the first ignition switch and the second ignition switch according to an ignition instruction transmitted by the input interface module, and the first ignition switch and the second ignition switch both adopt CMOS type switches to replace traditional mechanical relays. The problems that an ignition device is large in size and heavy in weight are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of unmanned aerial vehicle (UAV) ignition, and in particular relates to an UAV ignition system and device. Background Art

[0002] The ignition device is a type of launch controller. The launch controller is an important component for completing the launch of a drone. It generally has functions such as drone detection, power supply, communication, and pyrotechnic ignition, among which pyrotechnic ignition is the key function.

[0003] The ignition circuit for a pyrotechnic device generally needs to perform two functions: maintain a short circuit in the load when not ignited and provide ignition power to the load when ignited. Existing pyrotechnic device ignition circuits in launch controllers typically utilize at least two double-pole or single-pole mechanical relays connected in series: one relay is a short-circuit protection relay, providing short-circuit protection when not ignited; the other relay is an ignition relay, connecting the ignition power supply. Existing ignition devices have a large number of relays, resulting in a bulky and heavy ignition device. Utility Model Content

[0004] The purpose of the utility model is to provide an ignition system and device for a UAV, so as to solve the problem that the ignition device is large in size and heavy in weight.

[0005] The utility model is achieved through the following technical solutions:

[0006] An unmanned aerial vehicle ignition system includes an input interface module, a power conversion module, a control module, a communication module, an ignition switch module and an output interface module;

[0007] The ignition switch module includes a main ignition switch, a first ignition switch and a second ignition switch, wherein the first ignition switch and the second ignition switch are both CMOS switches;

[0008] The input interface module is connected to the power conversion module and the control module respectively, and is used to connect the power conversion module and the control module to the required power supply;

[0009] The power conversion module is connected to the main ignition switch, one output end of the main ignition switch is connected to the first ignition switch and the second ignition switch respectively, the other output end of the main ignition switch is connected to the output interface module, and the output ends of the first ignition switch and the second ignition switch are connected to the output interface module respectively;

[0010] The communication module is connected to the input interface module and the control module respectively, and is used for communication between the input interface module and the control module;

[0011] The control module is connected to the main ignition switch, the first ignition switch and the second ignition switch respectively, and is used to control the on and off of the main ignition switch, the first ignition switch and the second ignition switch.

[0012] In some embodiments, the input interface module includes a power interface, a control interface and a communication interface. The power interface is connected to the power conversion module and the control module respectively, the communication interface is connected to the communication module, and the control interface is connected to the ignition main switch and the control module respectively.

[0013] In some embodiments, a first unidirectional diode is further included, the control interface is connected to the anode of the first unidirectional diode, and the cathode of the first unidirectional diode is connected to the main ignition switch.

[0014] In some embodiments, a second unidirectional diode is further included, one output terminal of the control module is connected to the anode of the second unidirectional diode, and the cathode of the second unidirectional diode is connected to the main ignition switch.

[0015] In some embodiments, a short circuit protection circuit is provided between the first ignition switch, the second ignition switch and the output interface module respectively;

[0016] The short-circuit protection circuit includes a short-circuit resistor, one end of which is connected to the output end of the first ignition switch or the second ignition switch and the positive power supply end of the output interface module respectively, and the other end of the short-circuit resistor is connected to the negative power supply end of the output interface module.

[0017] In some embodiments, the input interface module uses an onboard micro rectangular connector.

[0018] In some embodiments, the control interface of the input interface module is connected to a safety switch circuit, and a ground line of the safety switch circuit is connected to a ground line of a power source to which the power interface is connected.

[0019] In some embodiments, the main ignition switch is a double-pole mechanical intermediate relay.

[0020] In some embodiments, the input interface module, the power conversion module, the control module, the communication module, the main ignition switch, the first ignition switch, the second ignition switch and the output interface module are integrated on a substrate.

[0021] The present invention also relates to an unmanned aerial vehicle (UAV) ignition device, comprising the above-mentioned UAV ignition system.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. The control module controls the on and off of the main ignition switch according to the insurance control signal transmitted by the input interface module. The control module then controls the on and off of the first ignition switch and the second ignition switch according to the ignition command transmitted by the input interface module to implement ignition, thereby simplifying the circuit. The first ignition switch and the second ignition switch both use CMOS switches instead of traditional mechanical relays, reducing the size and weight of the ignition system and facilitating the integrated design of the ignition system.

[0024] 2. A double-pole mechanical intermediate relay is connected in series with a CMOS switch as the ignition control switch, which achieves no leakage current after the circuit is disconnected, greatly reduces the risk of relay contact adhesion and short circuit, and improves reliability.

[0025] 3. Using short-circuit resistors instead of short-circuit protection relays reduces the size and weight of the ignition system, simplifies the circuit, reduces costs and improves reliability.

[0026] 4. The first unidirectional diode and the second unidirectional diode are used to prevent the main ignition switch from being burned out by reverse current generated at the control end of the main ignition switch when the main ignition switch is turned on or off.

[0027] 5. The safety switch signal of the control interface is connected in parallel with the safety switch signal of the communication interface to achieve compatibility with multiple safety controls and improve reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a circuit diagram of the ignition system in an embodiment of the present utility model.

[0030] Figure 2 This is a schematic structural diagram of the ignition device in an embodiment of the present utility model.

[0031] Among them: 1-lower housing, 2-upper housing, 3-input interface module, 4-output interface module, 5-power conversion module, 6-control module, 7-communication module, 8-ignition main switch, 9-first ignition switch, 10-second ignition switch, 11-first short-circuit resistor, 12-second short-circuit resistor. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0033] Example 1

[0034] Reference Figure 1 , a UAV ignition system, including an input interface module 3, a power conversion module 5, a control module 6, a communication module 7, an ignition switch module and an output interface module 4;

[0035] The ignition switch module includes a main ignition switch 8, a first ignition switch 9 and a second ignition switch 10. Both the first ignition switch 9 and the second ignition switch 10 are CMOS switches.

[0036] The input interface module 3 is connected to the power conversion module 5 and the control module 6 respectively, and is used to connect the power conversion module 5 and the control module 6 to the required power supply;

[0037] The power conversion module 5 is connected to the main ignition switch 8, one output end of the main ignition switch is connected to the first ignition switch 9 and the second ignition switch 10 respectively, the other output end of the main ignition switch is connected to the output interface module 4, and the output ends of the first ignition switch and the second ignition switch are respectively connected to the output interface module 4;

[0038] The communication module 7 is connected to the input interface module 3 and the control module 6 respectively, and is used for communication between the input interface module 3 and the control module 6;

[0039] The control module 6 is connected to the main ignition switch 8 , the first ignition switch 9 and the second ignition switch 10 respectively, and is used to control the on and off of the main ignition switch 8 , the first ignition switch 9 and the second ignition switch 10 .

[0040] The control module 6 controls the on and off of the ignition main switch 8 according to the insurance control signal transmitted by the input interface module 3. The control module 6 then controls the on and off of the first ignition switch 9 and the second ignition switch 10 according to the ignition command transmitted by the input interface module 3 to implement ignition, thereby simplifying the circuit. The first ignition switch 9 and the second ignition switch 10 both use CMOS switches instead of traditional mechanical relays, reducing the size and weight of the ignition system and facilitating the integrated design of the ignition system.

[0041] In some embodiments, the input interface module 3 includes a power interface, a control interface and a communication interface. The power interface is connected to the power conversion module 5 and the control module 6 respectively, the communication interface is connected to the communication module 7, and the control interface is connected to the ignition main switch 8 and the control module 6 respectively.

[0042] In some embodiments, a first unidirectional diode is further included, the control interface is connected to the anode of the first unidirectional diode, and the cathode of the first unidirectional diode is connected to the ignition main switch 8.

[0043] In some embodiments, a second unidirectional diode is further included, one output terminal of the control module is connected to the anode of the second unidirectional diode, and the cathode of the second unidirectional diode is connected to the ignition main switch 8.

[0044] The first unidirectional diode and the second unidirectional diode are used to prevent a reverse current from being generated at the control end of the ignition master switch 8 at the moment of closing or opening the ignition master switch, thereby preventing the ignition master switch 8 from being burned out.

[0045] In some embodiments, a short-circuit protection circuit is provided between the first ignition switch 9 , the second ignition switch 10 and the output interface module 4 ;

[0046] The short-circuit protection circuit includes a short-circuit resistor, and the short-circuit resistor includes a first short-circuit resistor 11 and a second short-circuit resistor 12;

[0047] One end of the first short-circuit resistor is respectively connected to the output end of the first ignition switch and the positive power supply port of the output interface module, and the other end of the first short-circuit resistor is connected to the negative power supply port of the output interface module; one end of the second short-circuit resistor is respectively connected to the output end of the second ignition switch and the positive power supply port of the output interface module, and the other end of the second short-circuit resistor is connected to the negative power supply port of the output interface module.

[0048] The first short-circuit resistor 11 and the second short-circuit resistor 12 are used to replace the short-circuit protection relay, which reduces the volume and weight of the ignition system, simplifies the circuit, reduces the cost and improves the reliability.

[0049] In some embodiments, the input interface module 3 uses an onboard micro rectangular connector.

[0050] In some embodiments, the control interface of the input interface module 3 is connected to a safety switch circuit, and a ground line of the safety switch circuit is connected to a ground line of a power source to which the power interface is connected.

[0051] In some embodiments, the main ignition switch 8 is a double-pole mechanical intermediate relay.

[0052] A double-pole mechanical intermediate relay connected in series with a CMOS switch is used as the ignition control switch, which ensures no leakage current after the circuit is disconnected, greatly reduces the risk of relay contact adhesion and short circuit, and improves reliability.

[0053] In some embodiments, the input interface module 3, the power conversion module 5, the control module 6, the communication module 7, the main ignition switch 8, the first ignition switch 9, the second ignition switch 10, the first unidirectional diode, the second unidirectional diode, the first short-circuit resistor 11, the second short-circuit resistor 12 and the output interface module 4 are integrated on the substrate.

[0054] The input interface module 3, the power conversion module 5, the control module 6, the communication module 7, the main ignition switch 8, the first ignition switch 9, the second ignition switch 10, the first unidirectional diode, the second unidirectional diode, the first short-circuit resistor 11, the second short-circuit resistor 12 and the output interface module 4 are integrated using a substrate to reduce the volume of the ignition system and achieve miniaturization.

[0055] Among them, the input interface module 3 adopts an onboard micro rectangular connector to provide power supply and wired communication electrical interface for the ignition system; the inner side of the input interface module is directly welded on the substrate; the power interface of the input interface module 3 provides two power supply points to the outside, namely the positive power supply port and the negative power supply port, the power interface can pass the voltage not more than 100V, the rated current 40A, the power interface is connected to the power conversion module 5, the ignition main switch 8, and the control module 6 through PCB wiring; the control interface of the input interface module 3 provides two insurance points to the outside, namely the insurance positive port and the insurance negative port, the control interface can control the input voltage not more than 60V, the control interface is unidirectionally connected to the ignition main switch 8 and the "insurance open" output port of the control module 6 through PCB wiring; the communication interface of the input interface module 3 provides four communication points to the outside, namely Rx +, Rx-, Tx+, Tx-, the four communication points are respectively connected to the signal points corresponding to the communication module 7; the input interface module 3 uses a small aviation plug on a PCB board to connect to the airborne power supply, safety switch circuit and drone controller respectively, which are used to transmit working power, safety switch signals and digital communications to the ignition system respectively. Digital communications include safety switch signals and ignition commands.

[0056] The safety switch signal of the control interface is connected in parallel with the safety switch signal of the communication interface, thereby achieving compatibility of multiple safety controls and improving reliability.

[0057] The power conversion module 5 is a wide-voltage stabilization module that is used to stabilize and convert the input DC power and output a constant voltage source to the ignition main switch 8 for ignition. The power conversion module 5 is connected to the input interface module 3, the control module 6 and the ignition main switch 8 respectively through PCB wiring.

[0058] The control module 6 uses a single-chip microcomputer and communicates with the communication module 7. It is used to parse the safety switch signal and ignition command and control the operation of the main ignition switch 8, the first ignition switch 9, and the second ignition switch 10 to implement ignition; the control module 6 sends ignition system status data to the communication module 7; the control module 6 is connected to the communication module 7, the input interface module 3, the main ignition switch 8, the first ignition switch 9, and the second ignition switch 10 through PCB wiring.

[0059] The communication module 7 uses an RS422 communication chip for converting between TTL level and RS422 level and providing isolated RS422 drive. The communication module 7 is connected to the control module 6 and the input interface module 3 respectively through PCB wiring.

[0060] The main ignition switch 8 adopts a double-pole mechanical intermediate relay to receive the fuse switch signal of the input interface module 3 or the communication module 7. After the coil of the main ignition switch is energized, the main ignition switch 8 outputs the ignition power output by the power conversion module 5 to the first ignition switch 9 and the second ignition switch 10; the main ignition switch 8 is connected to the first ignition switch 9, the second ignition switch 10 and the output interface module 4 respectively through PCB wiring.

[0061] The first ignition switch 9 adopts a high-power CMOS switch. After receiving the control signal output by the control module 6, it connects to the ignition power supply and implements ignition. The first ignition switch 9 is connected to the ignition main switch 8 and the output interface module 4 through PCB wiring.

[0062] The second ignition switch 10 adopts a high-power CMOS switch. After receiving the control signal output by the control module 6, it connects to the ignition power supply and implements ignition. The second ignition switch 10 is connected to the ignition main switch 8 and the output interface module 4 through PCB wiring.

[0063] The first short-circuit resistor 11 includes two resistors connected in series, each with a resistance of 100Ω. The first short-circuit resistor 11 is connected in parallel with the load through the output interface module 4 to release the accumulated static electricity of the load and provide safety protection. When the ignition system is ignited, the shunt current of the first short-circuit resistor 11 is negligible. The first short-circuit resistor 11 is connected to the load and the first ignition switch via PCB wiring.

[0064] The second short-circuit resistor 12 includes two resistors connected in series, each with a resistance of 100Ω. The second short-circuit resistor 12 is connected in parallel with the load through the output interface module 4 to release the accumulated static electricity of the load and provide safety protection. When the ignition system is ignited, the shunt current of the second short-circuit resistor 12 is negligible. The second short-circuit resistor 12 is connected to the load and the second ignition switch via PCB wiring.

[0065] The first unidirectional diode is used to conduct current unidirectionally from the input interface module 3 to the ignition master switch 8 to prevent reverse current from being generated at the control end of the ignition master switch 8 when the ignition master switch 8 is closed or opened, thereby burning out the ignition master switch 8. The first unidirectional diode is respectively connected to the input interface module 3, the ignition master switch 8, and the second unidirectional diode through PCB wiring.

[0066] The second unidirectional diode is used to control the control module 6 to conduct current unilaterally to the ignition master switch 8 to prevent reverse current from being generated at the control end of the ignition master switch 8 when the ignition master switch 8 is closed or opened, thereby burning out the ignition master switch 8. The second unidirectional diode is connected to the control module 6, the ignition master switch 8 and the first unidirectional diode respectively through PCB wiring.

[0067] The substrate is a rigid PCB board, which serves as a fixed platform for the input interface module 3, the power conversion module 5, the control module 6, the communication module 7, the main ignition switch 8, the first ignition switch 9, the second ignition switch 10, the first one-way diode, the second one-way diode, the first short-circuit resistor 11, the second short-circuit resistor 12 and the output interface module 4, and is used for power and signal wiring.

[0068] The working process of the above-mentioned UAV ignition system is as follows:

[0069] After the ignition system is assembled, the lower shell 1 of the ignition system is fixed to the drone through threads, the input interface module 3 is connected to the onboard power supply, the safety switch circuit, and the drone controller respectively, and the output interface module 4 is connected to the pyrotechnic device.

[0070] The power interface of the input interface module 3 is connected to the onboard power supply for transmitting the working power; the control interface of the input interface module 3 is connected to the safety switch circuit for transmitting the safety switch signal; the communication interface of the input interface module 3 is connected to the drone controller for transmitting RS422 digital communication.

[0071] The power of the input interface module 3 is transmitted to the power conversion module 5 and the control module 6; the power conversion module 5 converts the input power into a 15V constant voltage source and outputs it to the ignition main switch 8 for the ignition circuit to implement ignition; the control module 6 converts the input power into 5V working power.

[0072] The control interface of the input interface module 3 is connected to the fuse switch circuit, and the ground wire of the fuse switch circuit is connected to the ground wire of the power supply connected to the power interface to realize a common ground connection; the fuse positive port of the control interface is connected to the fuse switch signal circuit output by the control module and then connected to the coil of the ignition main switch for parallel control of the action of the ignition main switch 8.

[0073] The communication interface of the input interface module 3 is connected to the communication module 7 via an RS422 communication line for transmitting 422 signals.

[0074] The communication module 7 converts and isolates the 422 signal and the TTL level, and provides drive and protection for the control module 6 to communicate externally.

[0075] After the control module 6 is powered on, it runs the control software, receives and parses the RS422 data sent by the communication module 7; if the safety switch signal does not include the instruction to open the safety, the output safety control signal is low, and the ignition main switch 8 does not operate; if the safety switch signal includes the instruction to open the safety, the output safety control signal is high, the ignition main switch coil is energized, the contacts are connected, and the ignition current is output to the first ignition switch 9 and the second ignition switch 10.

[0076] The control module 6 receives and parses the RS422 data. If the RS422 data does not contain an ignition command, the output ignition signal is low, and the first ignition switch 9 and the second ignition switch 10 do not operate. If the RS422 data contains an ignition command, the output ignition signal is high, and the first ignition switch 9 and the second ignition switch 10 operate, outputting the ignition current to the load.

[0077] The control module 6 starts timing after outputting the ignition command, and controls the first ignition switch 9 and the second ignition switch 10 to cut off the ignition current when the accumulated time reaches the set value.

[0078] The present invention also relates to an unmanned aerial vehicle (UAV) ignition device, comprising the above-mentioned UAV ignition system.

[0079] The UAV ignition device also includes a housing, in which an input interface module 3, a power conversion module 5, a control module 6, a communication module 7, an ignition master switch 8, a first ignition switch 9, a second ignition switch 10, a first one-way diode, a second one-way diode, a first short-circuit resistor 11, a second short-circuit resistor 12, and an output interface module 4 are arranged;

[0080] Reference Figure 2 The housing consists of an upper housing 2 and a lower housing 1. The left and right sides of the upper housing 2 each have holes for the input interface module 3 and the output interface module 4 to extend through. The input interface module 3 and the output interface module 4 are fixedly connected to the upper housing via threads. The lower housing 1 has mounting holes reserved for mounting the entire ignition system on another base. The upper and lower housings 2 and 1 are fixedly connected via screws and encapsulated with epoxy resin.

[0081] The components of the ignition system are arranged in the housing, which protects the components and provides a fixing and connection position with external equipment.

[0082] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention falls within the scope of protection of the present invention.

Claims

1. A UAV ignition system, characterized in that: It includes input interface module, power conversion module, control module, communication module, ignition switch module and output interface module; The ignition switch module includes a main ignition switch, a first ignition switch and a second ignition switch, wherein the first ignition switch and the second ignition switch are both CMOS switches; The input interface module is connected to the power conversion module and the control module respectively, and is used to connect the power conversion module and the control module to the required power supply; The power conversion module is connected to the main ignition switch, one output end of the main ignition switch is connected to the first ignition switch and the second ignition switch respectively, the other output end of the main ignition switch is connected to the output interface module, and the output ends of the first ignition switch and the second ignition switch are connected to the output interface module respectively; The communication module is connected to the input interface module and the control module respectively, and is used for communication between the input interface module and the control module; The control module is connected to the main ignition switch, the first ignition switch and the second ignition switch respectively, and is used to control the on and off of the main ignition switch, the first ignition switch and the second ignition switch.

2. The UAV ignition system according to claim 1, characterized in that: The input interface module includes a power interface, a control interface and a communication interface. The power interface is connected to the power conversion module and the control module respectively, the communication interface is connected to the communication module, and the control interface is connected to the ignition main switch and the control module respectively.

3. The UAV ignition system according to claim 2, characterized in that: It also includes a first unidirectional diode, the control interface is connected to the anode of the first unidirectional diode, and the cathode of the first unidirectional diode is connected to the main ignition switch.

4. The UAV ignition system according to claim 1, characterized in that: A second unidirectional diode is also included, one output end of the control module is connected to the anode of the second unidirectional diode, and the cathode of the second unidirectional diode is connected to the main ignition switch.

5. The UAV ignition system according to claim 1, characterized in that: A short-circuit protection circuit is provided between the first ignition switch, the second ignition switch and the output interface module respectively; The short-circuit protection circuit includes a short-circuit resistor, one end of which is connected to the output end of the first ignition switch or the second ignition switch and the positive power supply end of the output interface module respectively, and the other end of the short-circuit resistor is connected to the negative power supply end of the output interface module.

6. The UAV ignition system according to claim 1, characterized in that: The input interface module uses an onboard micro rectangular connector.

7. The UAV ignition system according to claim 2, characterized in that: The control interface of the input interface module is connected to a safety switch circuit, and a ground line of the safety switch circuit is connected to a ground line of a power source connected to the power interface.

8. The UAV ignition system according to claim 1, characterized in that: The main ignition switch is a double-pole mechanical intermediate relay.

9. An unmanned aerial vehicle ignition system according to any one of claims 1 to 8, characterized in that: The input interface module, the power conversion module, the control module, the communication module, the main ignition switch, the first ignition switch, the second ignition switch and the output interface module are integrated on a substrate.

10. An ignition device for a UAV, characterized by: A UAV ignition system comprising the UAV ignition system according to any one of claims 1 to 9.

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