A weather rain / snow flame-rod ignition control device

Abstract

The utility model discloses a meteorological rain and snow flame strip ignition control device, including multichannel gating detection module, multichannel analog switch chip and with the input end connection of each analog switch chip's electric ignition head state detection circuit, multichannel drive execution module, including serial -to -parallel expansion chip, multichannel drive chip and multichannel switch device that electrically connect in proper order, the channel selection end of multichannel analog switch chip and enable end are connected to the first group general input output port of main control unit, the public output end of multichannel analog switch chip is connected to the analog-digital conversion port of main control unit, the serial control input end of serial -to -parallel expansion chip is connected to the second group general input output port of main control unit, the controlled end of multichannel switch device is through multichannel drive chip, serial -to -parallel expansion chip and main control unit and forms electric connection, and the switch loop of multichannel switch device is connected in series between ignition power and electric ignition head interface. The device can complete the accurate control of multichannel ignition head.

Description

Technical Field

[0001] This utility model relates to the field of machinery, specifically to a meteorological rain and snow enhancement flame strip ignition control device. Background Technology

[0002] As an important meteorological disaster prevention and mitigation tool, weather modification plays an increasingly important role in drought relief, rain enhancement, forest fire prevention, and air quality improvement. Its operational methods are diverse, mainly including aerial seeding, ground-based flare generators, and rain-inducing rockets. The core commonality of these methods is that they all require an electric ignition device to ignite specific catalyst flares or pyrotechnics, thereby creating a catalyst source in a predetermined airspace or area. The electric igniter, as the key component performing the ignition action, is essentially a low-resistance resistor with a bridge wire structure. It typically ignites due to the Joule heating effect when a specified current passes through it, thus igniting the subsequent agents. Ensuring the reliable ignition of the electric igniter under command is the fundamental physical prerequisite for the successful implementation of the entire weather modification operation.

[0003] Under current technological conditions, ignition control units of airborne, rocket-borne, and ground-based fixed operational equipment generally face several prominent engineering challenges. First is the issue of reliability. Operational equipment is often deployed in harsh environments such as the field and at high altitudes, where vibration, temperature changes, and humidity corrosion can easily cause open-circuit or short-circuit faults in the electric ignition head or its connecting circuits. If these fault conditions cannot be accurately identified before ignition, not only will the mission fail, but misjudgment may also cause reverse impacts or even damage to the control equipment. Existing devices often lack intuitive and effective status indication functions. When some channels in the system malfunction, maintenance personnel find it difficult to quickly and accurately locate the fault point, which is particularly inconvenient in emergency operations where every second counts.

[0004] Therefore, there is an urgent need in this field for a universal, multi-channel electric ignition control device that can balance high reliability, high integration, easy and quick maintenance, and adapt to the application requirements of various artificial weather modification operation platforms. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a meteorological rain and snow enhancement flame strip ignition control device.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model discloses a meteorological rain and snow enhancement flame strip ignition control device, comprising:

[0008] Main control unit;

[0009] The multi-channel selection detection module includes a multi-channel analog switch chip and an electric ignition head status detection circuit connected to the input terminal of each analog switch chip. The electric ignition head status detection circuit is configured to output an analog voltage signal characterizing the resistance state of the electric ignition head.

[0010] The multi-channel drive execution module includes a serial-to-parallel expansion chip, a multi-channel drive chip, and a multi-channel switch device connected in sequence. The first set of general-purpose input / output ports of the main control unit is connected to the channel selection terminal and the enable terminal of the multi-channel analog switch chip for cyclically selecting each analog voltage signal. The analog-to-digital conversion port of the main control unit is connected to the common output terminal of the multi-channel analog switch chip for receiving the selected analog voltage signal. The second set of general-purpose input / output ports of the main control unit is connected to the serial control input terminal of the serial-to-parallel expansion chip. The controlled terminal of the multi-channel switch device is electrically connected to the main control unit through the multi-channel drive chip and the serial-to-parallel expansion chip. The switching circuit of the multi-channel switch device is connected in series between the ignition power supply and the electric ignition head interface. The main control unit, the multi-channel selection detection module, and the multi-channel drive execution module form a closed-loop detection and control path through the above connection relationship.

[0011] Preferably, the multi-channel analog switch chip consists of multiple 8-to-1 analog switch chips. The channel selection address lines of the multiple 8-to-1 analog switch chips are connected in parallel to the same first group of general-purpose input / output ports of the main control unit. The enable terminal of each 8-to-1 analog switch chip is connected to a different first group of general-purpose input / output ports of the main control unit.

[0012] Preferably, the electric ignition head status detection circuit includes a first resistor, a second resistor, and an interface for connecting an external electric ignition head; one end of the interface is connected to a series branch of the second resistor and the electric ignition head, the series branch is connected in parallel with the first resistor between the reference power supply and ground, and the connection node of the second resistor and the electric ignition head in the series branch is connected to the input terminal of the multi-channel analog switch chip.

[0013] Preferably, the serial-to-parallel expansion chip is a shift register, whose serial data input, shift clock input, and latch clock input are connected to the second set of general-purpose input / output ports of the main control unit.

[0014] Preferably, the multiplexer chip is a Darlington transistor array, whose input terminals are connected one-to-one with the parallel output terminals of the shift register, and whose output terminals are connected to the control terminals of the multiplexer.

[0015] Preferably, the multiplexing device is an electromagnetic relay, with its coil pin as the controlled terminal and its normally open contact and common contact as the switching circuit.

[0016] Preferably, the device also includes a power management module, which includes a switching buck circuit for converting the externally input first DC voltage into the operating voltage required by the main control unit, the multiplexing detection module, and the serial-to-parallel expansion chip.

[0017] Preferably, the input terminal of the power management module is also connected in series with a resettable fuse and in parallel with a transient voltage suppression diode.

[0018] Preferably, the device also includes an RS-485 communication circuit, the differential signal terminal of which is connected to the serial communication port of the main control unit, and the bus terminal of which is used to connect to the communication interface of the host computer.

[0019] Preferably, the device further includes a status indication module; the status indication module includes a multi-channel onboard indicator circuit and an external indication interface; the multi-channel onboard indicator circuit is connected in parallel with the control terminal of the multi-channel switching device to indicate the driving status of each multi-channel switching device locally; the external indication interface is electrically connected to the multi-channel onboard indicator circuit, and the external indication interface is provided with a jumper selection bit to lead the indication signal of the onboard indicator circuit to the external indicator on the device housing through a jumper.

[0020] The beneficial effects of this utility model are as follows: By constructing a closed-loop control architecture with the main control unit as the core and multiple-channel selection detection modules and multiple-channel drive execution modules working in coordination, a highly integrated and miniaturized design is achieved. Only a small amount of microcontroller resources are needed to complete the precise control and status detection of up to 48 ignition heads, significantly saving circuit board space and manufacturing costs. It is particularly suitable for operating platforms such as aircraft and rockets that are sensitive to the size and weight of the load. Based on a high-precision detection mechanism combining a precision resistor voltage divider network and an analog-to-digital converter, it can clearly distinguish between the three states of the electric ignition head: normal, open circuit, and short circuit. This fundamentally eliminates ignition failure or equipment damage caused by misjudgment of status, greatly improving operational reliability. The device features a closed-loop hardware path that integrates status perception, logic judgment, and power execution, ensuring the real-time and accurate response to ignition commands. The power management module incorporates a self-resetting fuse and transient voltage suppression diodes, enhancing its adaptability and durability in complex electromagnetic environments and harsh weather conditions. Furthermore, a status indicator module with both onboard and remote display capabilities provides intuitive status feedback for on-site maintenance. Combined with remote control and status monitoring capabilities via a standard RS-485 communication interface, this creates an intelligent and visualized operational support system, significantly improving the maintenance efficiency and ease of operation for various weather modification equipment. Attached Figure Description

[0021] Figure 1 This is an overall hardware structure block diagram provided in an embodiment of the present utility model.

[0022] Figure 2 This is the circuit schematic of the multi-channel selection detection module.

[0023] Figure 3 This is the circuit diagram of the electric ignition head status detection circuit.

[0024] Figure 4 This is the circuit schematic of a serial-to-parallel expansion chip.

[0025] Figure 5 This is the circuit schematic of a multi-channel driver chip.

[0026] Figure 6 This is the circuit schematic of a multiplexer device.

[0027] Figure 7 This is the circuit schematic of the power management module.

[0028] Figure 8 This is the circuit diagram of a switching step-down circuit. Detailed Implementation

[0029] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. This utility model provides a meteorological rain and snow enhancement flare ignition control device, which can be widely used in various artificial weather modification platforms such as aircraft, rockets, and ground-based flare generators.

[0030] See Figure 1 As shown, the overall hardware structure of the device mainly includes a main control unit 1, a multi-channel selection detection module 2, a multi-channel drive execution module 4, a power management module 6, an RS-485 communication circuit 7, and a status indication module. These modules, through specific electrical connections, together constitute a complete closed-loop detection and control system.

[0031] The meteorological rain enhancement and snow enhancement flame ignition control device in this embodiment includes: a main control unit 1; a multi-channel selection and detection module 2, including a multi-channel analog switch chip and an electric ignition head status detection circuit 3 connected to the input terminals of each analog switch chip, the electric ignition head status detection circuit 3 being configured to output an analog voltage signal characterizing the resistance state of the electric ignition head; a multi-channel drive execution module 4, including a serial-to-parallel expansion chip, a multi-channel drive chip, and a multi-channel switch device 5 connected in sequence; the first set of general-purpose input / output ports of the main control unit 1 is connected to the channel selection terminal and the enable terminal of the multi-channel analog switch chip, used for cyclically selecting each analog switch chip. The analog voltage signal is received by the analog-to-digital converter port of the main control unit 1 and the common output terminal of the multi-channel analog switch chip. The second set of general-purpose input / output ports of the main control unit 1 is connected to the serial control input terminal of the serial-to-parallel expansion chip. The controlled terminal of the multi-channel switch device 5 is electrically connected to the main control unit 1 through the multi-channel driver chip and the serial-to-parallel expansion chip. The switching circuit of the multi-channel switch device 5 is connected in series between the ignition power supply and the electric ignition head interface. The main control unit 1, the multi-channel selection detection module 2 and the multi-channel drive execution module 4 form a closed-loop detection and control path through the above connection relationship.

[0032] The main control unit 1 is the core decision-making part of the device, typically implemented by an embedded microcontroller, such as the STC8H series microcontroller. It integrates necessary peripherals such as an analog-to-digital converter, general-purpose input / output ports, and a serial communication interface. The first set of general-purpose input / output ports outputs digital control signals. The analog switch chip is essentially a multiplexer, acting like a multi-position electronic rotary switch, switching its common output to one of the many input channels under the control of digital signals. The ignition head status detection circuit 3 converts the minute resistance changes, which are difficult to measure directly, into easily measurable voltage signals. When the main control unit 1 reads this voltage value through the analog-to-digital converter port, it can accurately determine whether the ignition head is in a normal, open-circuit, or short-circuit state. The second set of general-purpose input / output ports outputs serial control data. This data is converted by a serial-to-parallel expansion chip to form multiple parallel signals to control subsequent drive and actuator mechanisms. The multiplexer device 5 is the final switch controlling the on / off state of the high-current ignition power supply. The entire system, through precise hardware connections, forms a physical closed loop from state perception to action execution, ensuring the reliability and real-time performance of the control.

[0033] In this embodiment, the main control unit can be implemented using an STC8H1K28 series enhanced 51 core microcontroller. This chip integrates a 12-bit high-precision ADC module, multiple general-purpose I / O ports, and a UART serial communication interface, operating at 5V. Three pins of the main control unit 1 are configured as the first set of general-purpose input / output ports for outputting channel selection signals; one pin is configured as an analog-to-digital converter port for receiving analog voltage signals; and the other three pins are configured as the second set of general-purpose input / output ports for outputting serial control signals.

[0034] See Figure 2 As shown, the multi-channel analog switch chip consists of multiple 8-to-1 analog switch chips. The channel selection address lines of the multiple 8-to-1 analog switch chips are connected in parallel to the same first group of general-purpose input / output ports of the main control unit 1. The enable terminal of each 8-to-1 analog switch chip is connected to a different first group of general-purpose input / output ports of the main control unit 1.

[0035] Using an 8-to-1 analog switch chip, such as the 74HC4051, is a highly efficient way to expand input channels. Each chip can manage the detection signals of 8 ignition heads. The channel selection address lines of all chips, namely the three pins S0, S1, and S2, are connected in parallel and controlled by the same set of three I / O ports of the main control unit 1. This means that all chips "see" the same channel address at the same time. The enable pin of each chip is independently controlled by a different I / O port of the main control unit 1. This connection method forms a two-dimensional gating matrix. When the main control unit 1 needs to read a channel, it first outputs the channel address to the common address lines, then activates and pulls low only the enable pin of the target chip, disabling other chips. This scheme greatly saves the I / O port resources of the main control unit 1, using 3+n I / O ports (n being the number of chips) to control 8n detection channels, achieving optimal resource utilization.

[0036] In this embodiment, to achieve the detection and ignition of 48 ignition heads, the multi-channel selection detection module 2 consists of six 74HC4051PW 8-to-1 analog switch chips and their peripheral circuitry. Each 74HC4051PW manages eight detection channels, and the six chips work together to detect the status of the 48 electric ignition heads. The channel selection terminals S0, S1, and S2 of all 74HC4051PWs are connected in parallel to the three pins of the main control unit 1, i.e., the first group of general-purpose input / output ports. The channel selection terminals S0, S1, and S2 are three-bit binary codes used to select which of the eight channels is activated. For example, 000 represents channel Y0, so selecting channel Y0 requires the main control unit to output three 0s, which are sent to terminals S0, S1, and S2 respectively. The enable terminal E# of each chip is connected to the other six pins of the main control unit 1 to achieve independent chip selection control. This enable pin acts as a master switch for each chip. When the input signal to this pin is low, the chip is enabled (turned on), and the chip will connect the corresponding Y channel to the common terminal MNKG_Z_1 according to the addresses of the S0, S1, and S2 terminals. When the input signal to this pin is high, the chip is disabled, and all Y channels of this chip are disconnected from the common terminal MNKG_Z_1. The common terminal MNKG_Z_1 of the multi-channel analog chip is also grounded through a capacitor C1 to filter out high-frequency interference.

[0037] See Figure 3 As shown, the electric ignition head status detection circuit 3 includes a first resistor, a second resistor, and an interface for connecting an external electric ignition head; one end of the interface is connected to the series branch of the second resistor and the electric ignition head, the series branch is connected in parallel with the first resistor between the reference power supply and ground, and the connection node of the second resistor and the electric ignition head in the series branch is connected to the input terminal of the multi-channel analog switch chip.

[0038] The electric ignition head status detection circuit 3 is a resistor voltage divider network. The first resistor, typically with a large value of 10kΩ, is the upper arm resistor of the voltage divider circuit. The second resistor is connected in series with the external electric ignition head, forming the lower arm of the voltage divider circuit. A reference power supply provides a stable voltage reference of 5V. The ignition head interface is used to connect the external electric ignition head. When the ignition head is connected, the voltage at the node connected in series with the second resistor, i.e., the analog voltage signal, is determined by the resistance of the first resistor, the second resistor, and the ignition head itself. Since the first and second resistors are precisely known resistance values, a small change in the ignition head resistance (such as a normal connection with a resistance of 3Ω, an open circuit with infinity, and a short circuit with 0Ω) will cause a significant and distinguishable change in the voltage at that node. This analog voltage signal is sent to the input of a multiplexed analog switch chip, waiting for selection and reading by the main control unit 1, thereby converting the impedance characteristics of the ignition head into a quantifiable electrical signal.

[0039] Taking the first channel as an example, the electric ignition head status detection circuit includes a first resistor J1_1, a second resistor J2_1, and a two-pin interface DH1 for connecting to an external electric ignition head. The second resistor J2_1 and the electric ignition head DH1 form a series branch, which is connected in parallel with the first resistor J1_1 between the +5V reference power supply and ground. An analog voltage signal is generated at the connection point between the second resistor J2_1 and the electric ignition head DH1. This signal is connected to the Y0 input terminal (MNKG_Y0_1) of the first 74HC4051PW chip.

[0040] See Figure 4 , Figure 5 and Figure 6 As shown, the serial-to-parallel expansion chip is a shift register, whose serial data input, shift clock input, and latch clock input are connected to the second set of general-purpose input / output ports of the main control unit 1. The multiplexer chip is a Darlington transistor array, whose input is connected one-to-one with the parallel output of the shift register, and whose output is connected to the control terminal of the multiplexer 5.

[0041] The multi-channel drive execution module 4 uses six 74HC595 shift registers as serial-to-parallel expansion chips, six ULN2803 Darlington transistor arrays as multi-channel drive chips, and 48 HZ46-12V electromagnetic relays as multiplexing devices 5. The serial data input terminal DS of the six 74HC595 chips is connected to a common pin of the main control unit 1, the shift clock input terminal SHCP is connected to a common pin, and the latch clock input terminal STCP is connected to a common pin. The parallel output terminals QA-QH of each 74HC595 chip are connected to the corresponding ULN2803 input terminals 1B-8B. The ULN2803 output terminals 1C-8C drive the coils of the corresponding electromagnetic relays. The normally open contact NO1 and the common contact COM1 of the electromagnetic relays are connected in series between the +12V ignition power supply and the electric ignition head interface, forming a complete ignition circuit.

[0042] Multiplexer chips, such as the ULN2803 Darlington transistor array, serve to amplify current and provide electrical isolation. While the parallel outputs of shift registers can provide standard digital levels (e.g., 5V high), their drive current capability is very limited, typically only a few milliamps, far insufficient to directly drive relay coils or similar loads. Each channel of the Darlington transistor array integrates two series-connected transistors, resulting in high current gain. When its input receives a high-level signal from the shift register, the corresponding output conducts to ground, forming a low-impedance path. This conducting lower terminal can withstand currents up to hundreds of milliamps or even amperes, perfectly meeting the high current requirements for driving relay coils. Its inputs are connected one-to-one with the shift register outputs, ensuring a one-to-one transmission of control signals.

[0043] See Figure 7 and Figure 8 As shown, power management module 6 uses the XL1509-5V switching buck chip as its core, converting the externally input +24V DC voltage into a stable +5V voltage to provide operating power for the entire control circuit. At the module's +24V input terminal, i.e., the stage below the external 24V power supply, a resettable fuse (not shown in the circuit diagram) is connected in series, and a unidirectional TVS diode D1_1 is connected in parallel to provide overcurrent and overvoltage protection. The peripheral components of the switching buck circuit include a power inductor D12_1, an SS34 Schottky diode D2_1 as a freewheeling diode, an input filter capacitor D4_1, and an output filter capacitor D8_1.

[0044] RS-485 communication circuit 7: The differential signal terminal of RS-485 communication circuit 7 is connected to the serial communication port of main control unit 1, and the bus terminal of RS-485 communication circuit 7 is used to connect to the communication interface of the host computer.

[0045] RS-485 communication circuit 7 serves as the bridge for data exchange between the device and an external host computer. It typically consists of an RS-485 transceiver chip and its peripheral circuitry. The RS-485 standard employs differential signal transmission, a mechanism that provides strong common-mode interference immunity, effectively suppressing noise introduced during long-distance transmission and ensuring communication reliability. Its bus end is led out via terminal blocks, facilitating connection to the host computer via twisted-pair cables or other media, forming a stable and reliable remote control system. This allows operators to send ignition commands and receive status feedback from a safe distance.

[0046] See Figure 6 As shown, the device also includes a status indication module; the status indication module includes a multi-channel onboard indicator circuit 8 and an external indication interface 9; the multi-channel onboard indicator circuit 8 is connected in parallel with the control terminal of the multi-channel switching device 5, and is used to indicate the driving status of each multi-channel switching device 5 locally; the external indication interface 9 is electrically connected to the multi-channel onboard indicator circuit 8, and the external indication interface 9 is provided with a jumper selection bit, which is used to lead the indication signal of the onboard indicator circuit 8 to the external indicator on the device housing through a jumper.

[0047] The status indication module provides intuitive status visualization. The multi-channel onboard indicator circuit 8 typically consists of LEDs and current-limiting resistors connected in series, directly connected in parallel to the control terminals of the multi-channel switching device 5, such as across a relay coil. When a drive signal energizes the relay coil, the corresponding onboard indicator light illuminates simultaneously, providing on-site maintenance personnel with direct status indication, facilitating quick location of the active channel or troubleshooting. The external indication interface 9 offers flexibility in external status display. Its jumper selection allows users to selectively connect the drive signals of one or more onboard indicator lights to this interface by plugging and unplugging jumper caps or soldering zero-ohm resistors. This allows these signals to be routed via cables to external indicator lights mounted on the device housing, ensuring that critical operating statuses are clearly visible even when the device is installed inside the chassis, significantly improving maintainability and user-friendliness.

[0048] The status indication module includes 48 onboard indicator light circuits 8 and an external indicator interface 9. Each onboard indicator light circuit consists of a red LED K2_1 connected in series and a current-limiting resistor K1_1, which is directly connected in parallel across the coil of the corresponding electromagnetic relay. The external indicator interface 9 uses a connector, and by using a jumper selection bit, the drive signal of any onboard indicator light can be led to an external indicator light on the device housing to display the working status.

[0049] In practical applications, the device receives commands from the host computer via RS-485 communication circuit 7. When a detection command is received, the main control unit 1 cycles through each detection channel, reads the analog voltage value, and determines the status of the electric ignition head, returning the detection results to the host computer. When an ignition command is received, the main control unit 1 first checks the status of the ignition head of the designated channel. If the status is normal, it outputs a control signal through serial-to-parallel conversion to drive the corresponding electromagnetic relay to engage for 0.5-1 seconds, completing the ignition operation. Throughout the process, the status indicator light of the corresponding channel will illuminate, providing a clear display of the operating status.

[0050] The following details the working process of the device in this utility model:

[0051] The device's workflow is controlled by commands issued by the host computer via RS-485 communication circuit 7, and mainly consists of two modes: detection and ignition. The main control unit 1 coordinates the multi-channel selection detection module 2 and the multi-channel drive execution module 4 by parsing the commands.

[0052] When the main control unit 1 receives a "detection command" from the host computer via the RS-485 communication circuit 7, the system enters a full self-test state. At this time, all relays in the multi-channel drive execution module 4 remain open, and the ignition power circuit is in a physically disconnected safety mode. The main control unit 1 then starts the detection sequence, and its first group of general-purpose input / output ports outputs control signals according to a preset timing sequence, cyclically selecting all 48 channels in the multi-channel selection detection module 2. Specifically, the main control unit controls the enable terminal and channel selection address line of each 74HC4051 analog switch chip to sequentially connect the analog voltage signal generated by each ignition head status detection circuit 3 to the common output terminal in a time-division multiplexing manner, and the analog-to-digital converter inside the main control unit 1 samples and quantizes it. For each sampled voltage value, the core program of the main control unit 1 will make a real-time judgment based on the preset voltage threshold range to determine whether the ignition head is in a "normal", "open circuit", or "short circuit" state. After all 48 channels have been tested, the main control unit 1 will send the summarized "48-channel status result" data packet back to the host computer via RS-485 communication circuit 7, thus ending the testing process.

[0053] When the main control unit 1 receives an "ignition command" for a specific channel, such as igniting channel 25, the system will execute a rigorous closed-loop ignition procedure. The entire process consists of three key steps: First, pre-ignition detection is performed. The main control unit 1 controls the multi-channel selection detection module 2 to accurately select the detection channel corresponding to channel 25, read its analog-to-digital conversion value, and determine whether the resistance of the ignition head of that channel is within the normal range of approximately 3 ohms. Next, the decision and execution phase begins. If the detection result is abnormal, the main control unit 1 will immediately return "ignition failure" information to the host computer through the RS-485 communication circuit 7, and will not send any action signals to the multi-channel drive execution module 4 throughout the process. If the detection result is normal, the main control unit 1 will send specific serial data to the serial-to-parallel expansion chip through its second set of general-purpose input / output ports. After conversion, this data will only cause the bit line corresponding to the control of the relay of channel 25 to output a high level on the parallel output terminal, while the other bit lines will be at a low level. This high-level signal drives the corresponding multi-channel driver chip channel to conduct, thereby energizing the electromagnetic relay coil of channel 25 and closing its normally open contact to connect the ignition power supply to the interface of the 25th electric igniter for a preset duration of 0.5 to 1 second. Finally, after ignition verification, once the ignition duration ends and the relay is deactivated, the main control unit 1 again controls the multi-channel selection detection module 2 to perform status detection on channel 25. If the status read this time has changed from "normal" to "open circuit", it is determined that the electric igniter of that channel has successfully blown, and "ignition successful" information is returned to the host computer via RS-485 communication circuit 7; otherwise, "ignition failed" information is returned.

[0054] Through the above workflow, the device achieves fully automated closed-loop control of the electric igniter, from status detection and safety judgment to precise ignition and result verification, which greatly improves the reliability and safety of the operation.

[0055] This utility model embodiment, through the above-described hardware configuration and connection method, achieves accurate detection and reliable control of 48-channel electric ignition heads, and has the advantages of high integration, good reliability, and easy maintenance, which can meet the application requirements of various artificial weather modification operation platforms.

[0056] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A meteorological rain and snow enhancement flame strip ignition control device, characterized in that, include: Main control unit (1); The multi-channel selection detection module (2) includes a multi-channel analog switch chip and an electric ignition head status detection circuit (3) connected to the input terminal of each analog switch chip. The electric ignition head status detection circuit (3) is configured to output an analog voltage signal characterizing the resistance state of the electric ignition head. The multi-channel drive execution module (4) includes a serial-to-parallel expansion chip, a multi-channel drive chip, and a multi-channel switching device (5) connected in sequence. The first set of general-purpose input / output ports of the main control unit (1) are connected to the channel selection terminal and the enable terminal of the multi-channel analog switch chip, and are used to cyclically select each of the analog voltage signals; The analog-to-digital conversion port of the main control unit (1) is connected to the common output terminal of the multi-channel analog switch chip to receive the selected analog voltage signal; The second set of general-purpose input / output ports of the main control unit (1) is connected to the serial control input terminal of the serial-to-parallel expansion chip; The controlled end of the multiplexer (5) is electrically connected to the main control unit (1) through the multiplexer driver chip and the serial-to-parallel expansion chip. The switching circuit of the multiplexer (5) is connected in series between the ignition power supply and the electric ignition head interface. The main control unit (1), the multi-channel selection detection module (2), and the multi-channel drive execution module (4) form a closed-loop detection and control path through the above connection relationship.

2. The meteorological rain and snow enhancement flame strip ignition control device according to claim 1, characterized in that, The multi-channel analog switch chip is a plurality of 8-to-1 analog switch chips. The channel selection address lines of the plurality of 8-to-1 analog switch chips are connected in parallel to the same group of the first group of general-purpose input / output ports of the main control unit (1). The enable terminal of each 8-to-1 analog switch chip is respectively connected to different groups of the first group of general-purpose input / output ports of the main control unit (1).

3. The meteorological rain and snow enhancement flame strip ignition control device according to claim 1, characterized in that, The electric ignition head status detection circuit (3) includes a first resistor, a second resistor, and an interface for connecting an external electric ignition head; one end of the interface is connected to a series branch of the second resistor and the electric ignition head, the series branch is connected in parallel with the first resistor between the reference power supply and ground, and the connection node of the second resistor and the electric ignition head in the series branch is connected to the input terminal of the multi-channel analog switch chip.

4. The meteorological rain and snow enhancement flame strip ignition control device according to claim 1, characterized in that, The serial-to-parallel expansion chip is a shift register, and its serial data input terminal, shift clock input terminal and latch clock input terminal are connected to the second set of general-purpose input / output ports of the main control unit (1).

5. The meteorological rain and snow enhancement flame strip ignition control device according to claim 4, characterized in that, The multi-channel driver chip is a Darlington transistor array, whose input terminal is connected one-to-one with the parallel output terminal of the shift register, and whose output terminal is connected to the control terminal of the multi-channel switching device (5).

6. The meteorological rain and snow enhancement flame strip ignition control device according to claim 1, characterized in that, The multiplexer (5) is an electromagnetic relay, with its coil pin serving as the controlled terminal and its normally open contact and common contact serving as the switching circuit.

7. The meteorological rain and snow enhancement flame strip ignition control device according to claim 1, characterized in that, It also includes a power management module (6), which includes a switching buck circuit for converting the externally input first DC voltage into the operating voltage required by the main control unit (1), the multiplexing detection module (2) and the serial-to-parallel expansion chip.

8. The meteorological rain and snow enhancement flame strip ignition control device according to claim 7, characterized in that, The input terminal of the power management module (6) is also connected in series with a self-resetting fuse and in parallel with a transient voltage suppression diode.

9. The meteorological rain and snow enhancement flame strip ignition control device according to claim 1, characterized in that, It also includes an RS-485 communication circuit (7), the differential signal terminal of which is connected to the serial communication port of the main control unit (1), and the bus terminal of which is used to connect to the communication interface of the host computer.

10. A meteorological rain enhancement and snow enhancement flame strip ignition control device according to any one of claims 1-9, characterized in that, It also includes a status indicator module; The status indication module includes a multi-channel onboard indicator circuit (8) and an external indication interface (9). The multi-channel onboard indicator circuit (8) is connected in parallel with the control terminal of the multi-channel switching device (5) to indicate the driving status of each multi-channel switching device (5) locally; The external indicator interface (9) is electrically connected to the multi-channel onboard indicator circuit (8). The external indicator interface (9) is provided with a jumper selection bit, which is used to lead the indicator signal of the onboard indicator circuit (8) to the external indicator on the device housing through a jumper.

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