A synchronous triggering system and method for a pulse wind tunnel

Abstract

The embodiment of the present specification provides a synchronization trigger system and method for a pulse wind tunnel, the system comprising: a signal trigger module, a light source control module and a device control module; the signal trigger module is used for receiving a reference signal; the sending device and the receiving device for the reference signal are electrically isolated based on a circuit structure; the reference value of a trigger signal is set according to the isolated reference signal; whether the light source and the device are turned on or not is indicated according to the trigger signal and the reference value; the light source control module is used for controlling the flicker frequency of the light source based on a MOSFET and a triode; the device control module is used for controlling the start and stop of the device according to a preset delay. The technical scheme provided in the present application is used to solve the problem that the risks among the sub-circuits are related to each other and the performance applicability is not strong.

Description

A Synchronous Triggering System and Method for Pulse Wind Tunnel Technical Field

[0001] This document relates to the field of hypersonic pulses, and in particular to a synchronous triggering system and method for pulse wind tunnels. Background Technology

[0002] High-speed photography is an important technique for conducting free-flight experiments, phosphorescent thermography experiments, and infrared experiments in hypersonic pulse wind tunnels. It allows for the acquisition of high-quality image information within an effective timeframe of only a few milliseconds to hundreds of milliseconds.

[0003] To achieve time differences ranging from a few milliseconds to hundreds of milliseconds, existing technologies typically employ high-frequency flickering light sources.

[0004] However, in the existing technology, the circuits for realizing high-frequency flickering of light sources have problems such as interrelated risks between sub-circuits and poor performance applicability. Summary of the Invention

[0005] In view of the above analysis, this application aims to propose a synchronous triggering system and method for pulse wind tunnels, which solves at least one of the above-mentioned technical problems.

[0006] In one aspect, one or more embodiments of this specification provide a synchronous triggering system for a pulse wind tunnel, including: a signal triggering module, a light source control module, and a device control module;

[0007] The signal triggering module is used to receive a reference signal; to electrically isolate the transmitting and receiving devices for the reference signal based on the circuit structure; to set a reference value for the trigger signal according to the isolated reference signal; and to indicate whether the light source and the device are turned on according to the trigger signal and the reference value.

[0008] The light source control module is used to control the flicker frequency of the light source based on MOSFETs and transistors;

[0009] The device control module is used to control the start and stop of the device according to a preset delay.

[0010] Furthermore, the signal triggering module includes: an isolation unit and a tuning unit;

[0011] The reference signal and the trigger signal enter the modulation unit from two different ports, respectively;

[0012] The isolation unit is used to isolate the transmitting and receiving devices of the reference signal based on optical coupling;

[0013] The modulation unit is used to modulate the value of the reference signal to obtain a reference value, and to determine whether the trigger signal is greater than the reference value.

[0014] Furthermore, the isolation unit includes: a first resistor, a transistor, a second resistor, and an optocoupler;

[0015] The first resistor is connected to the base of the transistor;

[0016] The emitter of the transistor is grounded;

[0017] The collector of the transistor, the light emitter of the optocoupler, and the second resistor form a series circuit;

[0018] One end of the photodetector of the optocoupler is connected to the modulation unit.

[0019] Furthermore, the tuning unit includes a tuning circuit, a filtering circuit, and a comparison circuit;

[0020] The reference signal passes sequentially through the modulation circuit, the filtering circuit, and the comparison circuit; the trigger signal directly enters the comparison circuit.

[0021] The modulation circuit is used to modulate the value of the reference signal;

[0022] The filtering circuit is used to filter the filter circuit;

[0023] The comparison circuit is used to determine whether the trigger signal is greater than a reference value.

[0024] Furthermore, the adjustment circuit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a three-terminal adjustable shunt reference source, and a transistor;

[0025] One end of the third resistor and the fourth resistor are respectively connected to the base of the transistor, and the other end is respectively grounded;

[0026] One end of the fifth resistor is connected to the collector of the transistor, and the other end is grounded;

[0027] One end of the sixth resistor is connected to the collector of the transistor, and the other end is connected to one end of the seventh resistor, the other end of which is grounded.

[0028] The cathode of the three-terminal adjustable shunt reference source is connected to the collector of the transistor, the anode of the three-terminal adjustable shunt reference source is connected to the emitter of the transistor, and the three-terminal adjustable shunt reference source is connected to the sixth resistor and the seventh resistor respectively.

[0029] The eighth resistor, the ninth resistor, and the tenth resistor are connected end to end in sequence. The first end of the eighth resistor is connected to the collector of the transistor, and the last end of the tenth resistor is connected to the filter circuit.

[0030] One end of the first capacitor is connected to the tail end of the eighth resistor and the head end of the ninth resistor, and the other end is grounded.

[0031] One end of the second capacitor is connected to the tail end of the tenth resistor, and the other end is grounded;

[0032] The emitter of the transistor is grounded.

[0033] Furthermore, the light source control module includes multiple isolation circuits and multiple control circuits;

[0034] One of the isolation circuits and one of the control circuits correspond to a light source.

[0035] Furthermore, the isolation circuit includes: an eleventh resistor, a twelfth resistor, a thirteenth resistor, a transistor, and an optocoupler;

[0036] One end of the eleventh resistor is connected to one end of the twelfth resistor, and the other end is connected to the base of the transistor.

[0037] The other end of the twelfth resistor is grounded;

[0038] The collector of the transistor is connected to one end of the thirteenth resistor and one end of the light emitter of the optocoupler, respectively.

[0039] The emitter of the transistor is connected to ground;

[0040] The other end of the light emitter of the optocoupler is grounded;

[0041] The other end of the thirteenth resistor is connected to a power source;

[0042] The light-receiving end of the optocoupler is connected to the control circuit.

[0043] Furthermore, the control circuit includes: a third capacitor, a fourteenth resistor, a fifteenth resistor, a control chip, and a MOSFET;

[0044] The other end of the third capacitor is grounded, and one end of the third capacitor is connected to the control chip and one end of the fourteenth resistor, respectively.

[0045] The other end of the fourteenth resistor is connected to the control chip;

[0046] One end of the fifteenth resistor is connected to the control chip, and the other end of the fifteenth resistor is connected to the gate of the MOSFET.

[0047] The MOSFET source is grounded;

[0048] The drain of the MOSFET is connected to an external power supply.

[0049] Furthermore, the device control module includes: a sixteenth resistor, a seventeenth resistor, a transistor, and an optocoupler;

[0050] The base of the transistor is connected to the sixteenth resistor;

[0051] One end of the collector of the transistor is connected to the seventeenth resistor and one end of the light emitter of the optocoupler, respectively;

[0052] The emitter of the transistor is grounded;

[0053] The other end of the light emitter of the optocoupler is grounded.

[0054] Secondly, one or more embodiments of this specification provide a synchronization triggering method for a pulse wind tunnel based on the system described in the first aspect, comprising:

[0055] Receive trigger level;

[0056] Based on the trigger level, determine whether the trigger level has reached a preset reference value;

[0057] When the trigger level reaches the reference value, the light source is controlled to start and stop synchronously, and the control device is controlled to start and stop according to a preset delay.

[0058] Compared with the prior art, this application can achieve at least the following technical effects:

[0059] In existing technologies, due to flaws in circuit design, it is impossible to simultaneously set the reference value for the trigger signal and isolate the reference signal transmitting and receiving devices. Therefore, the circuit structure designed in this application can first isolate the reference signal transmitting and receiving devices to ensure that there is no risky association between the circuits of the receiving and transmitting devices. Then, the reference value for the trigger signal is set, thus enabling precise and safe start-stop of the light source and related equipment. Simultaneously, high-frequency flickering of the light source is achieved based on MOSFETs and transistors. During the shooting process, the relevant equipment needs to be operated in a certain sequence; therefore, the equipment control module starts and stops the relevant equipment according to a preset delay, in conjunction with the signal triggering module and the light source control module, thereby achieving synchronous triggering of the light source and equipment. Attached Figure Description

[0060] To more clearly illustrate the technical solutions in one or more embodiments of this specification or in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0061] Figure 1 is a schematic diagram of a synchronous triggering system for a pulse wind tunnel provided in one or more embodiments of this specification;

[0062] Figure 2 is a circuit diagram of the isolation unit of the signal triggering module provided in one or more embodiments of this specification;

[0063] Figure 3 is a circuit diagram of the tuning unit of the signal triggering module provided in one or more embodiments of this specification;

[0064] Figure 4 is a circuit diagram of the isolation unit of the light source control module provided in one or more embodiments of this specification;

[0065] Figure 5 is a circuit diagram of the control circuit of the light source control module provided in one or more embodiments of this specification.

[0066] Figure 6 is a circuit diagram of the control circuit of the device control module provided in one or more embodiments of this specification;

[0067] Figure 7 is a schematic diagram of the control logic of the device control module provided in one or more embodiments of this specification. Detailed Implementation

[0068] To enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this document.

[0069] To meet the requirements of high-speed photography, multiple light sources need to be set up in the wind tunnel, ensuring that each light source flashes at a high frequency. Simultaneously, various devices must be installed in the wind tunnel to enable continuous shooting. These devices include high-speed photography equipment, a data acquisition unit, and relays. In practice, these devices operate in a sequential manner. For example, the relays first power up the data acquisition unit and photography equipment; then the data acquisition unit collects the light signal; and finally, the high-speed photography equipment takes pictures based on the collected light signal.

[0070] To address the above scenarios, this application needs to solve three problems:

[0071] Question 1: Controlling multiple light sources to blink simultaneously;

[0072] Question 2: Controlling multiple devices to perform automatic high-speed shooting while multiple light sources are flashing;

[0073] Question 3: High-frequency flickering of the light source makes the circuit prone to failure, and once a circuit fails in one part, it can easily paralyze the entire circuit.

[0074] To address the aforementioned technical problems, this application provides a synchronous triggering system for pulse wind tunnels, as shown in Figure 1, comprising: a triggering circuit, a main control chip, a light source control module 102, and a device control module 103.

[0075] The signal triggering module 101 is located on the triggering circuit.

[0076] In this embodiment, the trigger circuit determines whether the input trigger level Vin reaches the set reference value Vref. When the trigger voltage Vin is greater than Vref, it is considered a valid trigger. To generate the next trigger, Vin needs to drop below Vref and then rise above Vref. The reference value Vref of the trigger circuit is given by the main control chip, and its value is 0-5V with an adjustment accuracy of 0.05V.

[0077] The trigger level comes from the wind tunnel's sensors and is used to characterize the wind tunnel's operating status. The reference value comes from empirical values ​​obtained by testing personnel through experiments in the wind tunnel. That is, during actual operation, the testing personnel need to determine whether to start or stop the equipment and light sources in the wind tunnel based on the wind tunnel's operating status. When it is determined that the equipment and light sources in the wind tunnel should be turned on, a reference signal is sent to the trigger circuit through the main control chip, causing the signal trigger module 101 to obtain a reference value based on the reference signal, and the trigger level Vin reaches that reference value. If it is determined that the equipment and light sources in the wind tunnel should not be turned on, a reference signal is sent to the trigger circuit through the main control chip, causing the signal trigger module 101 to obtain a reference value based on the reference signal, and the trigger level Vin cannot reach that reference value. This method solves problem 1.

[0078] The signal triggering module 101 is used to receive a reference signal; based on the circuit structure, it electrically isolates the transmitting and receiving devices for the reference signal; based on the isolated reference signal, it sets a reference value for the trigger signal; based on the trigger signal and the reference value, it indicates whether the light source and the device are turned on.

[0079] It should be noted that, in order to electrically isolate the main control chip and the trigger circuit while completing other functions, this application divides the Vref setting into two segments based on the circuit: one segment is an isolation unit, and the other segment is an adjustment unit.

[0080] In this system, the signal triggering module 101 obtains a reference signal through an isolation unit. The reference signal and the trigger signal then enter the modulation unit from two different ports. The isolation unit is used to isolate the transmitting and receiving devices of the reference signal based on an optocoupler. The modulation unit modulates the value of the reference signal to obtain a reference value and determines whether the trigger signal is greater than the reference value.

[0081] Specifically, the isolation unit includes: a first resistor, a transistor, a second resistor, and an optocoupler;

[0082] The first resistor is connected to the base of the transistor;

[0083] The transistor's emitter is grounded;

[0084] The collector of the transistor, the light emitter of the optocoupler, and the second resistor form a series circuit.

[0085] One end of the optical receiver of the optocoupler is connected to the modulation unit.

[0086] The isolation unit circuit structure is shown in Figure 2. R9 is the first resistor, Q5 is the transistor, R52 is the second resistor, and OP5 is the optocoupler. Pin 8 of OP5 is connected to capacitor C27. Capacitor C27 is grounded.

[0087] The CPU generates a trigger signal DAC-P, which is then converted into a reference signal DAC-POL via R9, Q5, and OP5, thus achieving electrical isolation between the receiving and transmitting devices of the DAC-P signal.

[0088] In this embodiment, the modulation unit includes a modulation circuit, a filtering circuit, and a comparison circuit. The modulation circuit modulates the value of the reference signal; the filtering circuit filters the signal; and the comparison circuit determines whether the trigger signal is greater than the reference value. During operation, the reference signal passes sequentially through the modulation circuit, the filtering circuit, and the comparison circuit. The trigger signal directly enters the comparison circuit.

[0089] The circuit diagram of the adjustment unit is shown in Figure 3. The adjustment circuit includes: the third resistor (R32), the fourth resistor (R30), the fifth resistor (R31), the sixth resistor (R33), the seventh resistor (R34), the eighth resistor (R35), the ninth resistor (R36), the tenth resistor (R37), the first capacitor (C12), the second capacitor (C13), the three-terminal adjustable shunt reference source (Q2), the transistor (Q1), and the capacitor C3.

[0090] The third and fourth resistors are connected at one end to the base of the transistor and at the other end to ground; the other end of the fourth resistor is grounded through capacitor C3.

[0091] One end of the fifth resistor is connected to the collector of the transistor, and the other end is grounded;

[0092] One end of the sixth resistor is connected to the collector of the transistor, and the other end is connected to one end of the seventh resistor, while the other end of the seventh resistor is grounded.

[0093] The cathode (C) of the three-terminal adjustable shunt reference source is connected to the collector of the transistor, the anode (A) of the three-terminal adjustable shunt reference source is connected to the emitter of the transistor, and the three-terminal adjustable shunt reference electrode (REF) is connected to the sixth resistor and the seventh resistor respectively.

[0094] The eighth, ninth, and tenth resistors are connected end to end in sequence. The first end of the eighth resistor is connected to the collector of the transistor, and the last end of the tenth resistor is connected to the filter circuit.

[0095] One end of the first capacitor is connected to the tail end of the eighth resistor and the head end of the ninth resistor, and the other end is grounded.

[0096] One end of the second capacitor is connected to the tail end of the tenth resistor, and the other end is grounded.

[0097] The emitter of the transistor is grounded.

[0098] Specifically, the components forming the filter circuit include: capacitors C15, C27, and C40; resistors R38 and R40; and comparator IC2. The components forming the comparator circuit include: capacitors C28, C38, and C41; resistors R41 and R45; and comparator IC3A. Zener diodes D15 and D16, and resistor R39 form the input path TRRIGGER for the trigger signal.

[0099] During operation, the reference signal DAC-POL enters the modulation circuit through transistor Q1, and a voltage varying with the pulse duty cycle is obtained at R35; this voltage value is the reference value. The voltage output from R35 is directly fed into comparator IC2 in the filter circuit for filtering, and finally, the filtered voltage enters comparator IC3A in the comparison circuit. Simultaneously, the trigger level from the wind tunnel sensor also enters comparator IC3A via TRRIGGER. When the trigger level is greater than the reference value, the TRG-OUT signal output by IC3A is high; otherwise, the TRG-OUT signal output by IC3A is low. Afterward, the TRG-OUT signal enters the main control chip via an optocoupler, further achieving electrical isolation between the main control chip and the trigger circuit.

[0100] In this embodiment, the light source control module is used to control the flicker frequency of the light source based on MOSFETs and transistors; the device control module is used to control the start and stop of the device according to a preset delay.

[0101] Because the effective operating time of a pulse wind tunnel is only tens to hundreds of milliseconds, a high flicker frequency, up to 5 kHz, is required for the light source system to acquire as much data as possible within this timeframe. Achieving stable light source output at such a high flicker frequency places extremely stringent demands on the rise time and reliability of the switching signals. Traditional methods use solid-state relays as switches, but their highest performance can only maintain the millisecond level. Foreign equipment can meet high-frequency flicker requirements, but their technical solutions are generally quite expensive.

[0102] Based on the above problems, this application uses MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) and transistor as fast switching switches for light sources.

[0103] Specifically, since there are multiple light sources to be controlled, the light source control module includes multiple isolation circuits and multiple control circuits; one isolation circuit and one control circuit correspond to one light source.

[0104] The isolation circuit is used to isolate the circuits of the light source control module and the light source to prevent circuit faults caused by high-frequency flicker from being transmitted to the light source control module.

[0105] As shown in Figure 4, the isolation circuit includes: eleventh resistor (R10), twelfth resistor (R13), thirteenth resistor (R45), transistor (Q6), optocoupler (OP7) and capacitor C29;

[0106] One end of the eleventh resistor is connected to one end of the twelfth resistor, and the other end is connected to the base of the transistor.

[0107] The other end of the twelfth resistor is grounded;

[0108] The collector of the transistor is connected to one end of the thirteenth resistor and one end of the light emitter of the optocoupler, respectively.

[0109] The emitter of the transistor is connected to ground;

[0110] The other end of the optocoupler's light emitter is grounded;

[0111] The other end of the thirteenth resistor is connected to the power supply;

[0112] The light-receiving end of the optocoupler is connected to the control circuit and one end of capacitor C29, while the other end of C29 is grounded.

[0113] During operation, the control signal PWM passes through transistor Q6 and optocoupler OP7 in Figure 4 to obtain signal POUT1, thus isolating the light source control module and the light source circuit.

[0114] As shown in Figure 5, the control circuit includes: a third capacitor (C36), a fourteenth resistor (R8), a fifteenth resistor (R27), a control chip (IC11), and a MOSFET (M8);

[0115] The other end of the third capacitor is grounded, and one end of the third capacitor is connected to the control chip and one end of the fourteenth resistor.

[0116] The other end of the fourteenth resistor is connected to the control chip;

[0117] One end of the fifteenth resistor is connected to the control chip, and the other end of the fifteenth resistor is connected to the MOSFET gate.

[0118] MOSFET source grounded;

[0119] The drain of the MOSFET is connected to an external power supply.

[0120] During operation, signal POUT1 controls the on / off state of M8 via control chip IC11. M8 is a dedicated driver chip for MOSFETs, with a drive current exceeding 2.5A, offering higher reliability than direct drive by conventional resistors. Pin 2 of MOSFET M8 is the output PWM-O1, connected to the positive power supply, and pin 3 is connected to the ground power supply. When signal POUT1 is high, conduction occurs between pins 2 and 3, turning off the light source; conversely, the light source turns on when it is low. Furthermore, a clock unit is included in the control chip to control the flashing frequency and operating range of the light source. For example, the clock unit can be set to flash for 100 seconds, flashing 5000 times per second, where 5000 flashes constitute the flashing frequency and 100 seconds constitute the operating range.

[0121] In this embodiment, the control circuit of the device control module is shown in FIG6, including: a sixteenth resistor (R8), a seventeenth resistor (R49), a transistor (Q4), an optocoupler (OP4), and a capacitor C33;

[0122] The base of the transistor is connected to the sixteenth resistor;

[0123] One end of the transistor's collector is connected to the seventeenth resistor and one end of the optocoupler's light emitter, respectively.

[0124] The transistor's emitter is grounded;

[0125] The other end of the optocoupler's light emitter is grounded;

[0126] One end of the photodetector of the optocoupler is connected to one end of capacitor C29, and the other end of capacitor C29 is grounded.

[0127] During operation, the input control signal TTL1 is processed by transistor Q4 and optocoupler OP4 in Figure 6 to obtain signal TOUT1. The above method realizes the isolation of the control module and the circuit of each device.

[0128] The control logic of the equipment control module is shown in Figure 7. The startup time of each device is the same. When the startup time is different, each device can be started according to the preset timing sequence in the manner shown in Figure 7.

[0129] In summary, this application solves problem 1 based on the set reference values, the circuit structure of the signal triggering module 101, and the circuit structure of the light source control module 102. Problem 3 is solved by incorporating optocouplers in the signal triggering module 101, the light source control module 102, and the device control module 103. Problem 2 is solved based on the circuit structures of the signal triggering module 101, the light source control module 102, and the device control module 103, as well as the control logic of the device control module 103.

[0130] This application provides a synchronization triggering method for pulse wind tunnels based on the above system, comprising the following steps:

[0131] Step 1: Receive the trigger level;

[0132] Step 2: Determine whether the trigger level has reached the preset reference value based on the trigger level.

[0133] Step 3: When the trigger level reaches the reference value, control the light source to start and stop synchronously and control the equipment to start and stop according to the preset delay.

[0134] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0135] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0136] One or more embodiments of this specification can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a particular task or implement a particular abstract data type. One or more embodiments of this specification can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0137] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0138] The above description is merely an embodiment of this document and is not intended to limit the scope of this document. Various modifications and variations can be made to this document by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this document should be included within the scope of the claims of this document.

Claims

1. A synchronous triggering system for pulse wind tunnels, characterized in that, include: The system comprises a signal triggering module, a light source control module, and a device control module; the signal triggering module is used to receive a reference signal. Based on the circuit structure, the transmitting and receiving devices for the reference signal are electrically isolated; a reference value for the trigger signal is set according to the isolated reference signal; the light source and the device are indicated whether to turn on according to the trigger signal and the reference value; the light source control module is used to control the flashing frequency of the light source based on MOSFETs and transistors; The light source control module includes multiple isolation circuits and multiple control circuits; One of the isolation circuits and one of the control circuits correspond to one light source; The isolation circuit includes: an eleventh resistor, a twelfth resistor, a thirteenth resistor, a transistor, and an optocoupler; one end of the eleventh resistor is connected to one end of the twelfth resistor, and the other end is connected to the base of the transistor; the other end of the twelfth resistor is grounded; the collector of the transistor is connected to one end of the thirteenth resistor and one end of the light emitter of the optocoupler; the emitter of the transistor is grounded; the other end of the light emitter of the optocoupler is grounded; the other end of the thirteenth resistor is connected to a power supply; the light-receiving end of the optocoupler is connected to the control circuit; the control circuit includes: a third capacitor, a fourteenth resistor, a fifteenth resistor, a control chip, and a MOSFET; the other end of the third capacitor is grounded, and one end of the third capacitor is connected to the control chip and one end of the fourteenth resistor; the other end of the fourteenth resistor is connected to the control chip; one end of the fifteenth resistor is connected to the control chip, and the other end of the fifteenth resistor is connected to the gate of the MOSFET; the source of the MOSFET is grounded; the drain of the MOSFET is connected to an external power supply; the device control module is used to control the start and stop of the device according to a preset delay.

2. The system according to claim 1, characterized in that, The signal triggering module includes an isolation unit and a modulation unit; the reference signal and the trigger signal enter the modulation unit from two different ports respectively; the isolation unit is used to isolate the transmitting and receiving devices of the reference signal based on an optical coupler; the modulation unit is used to modulate the value of the reference signal to obtain a reference value, and to determine whether the trigger signal is greater than the reference value.

3. The system according to claim 2, characterized in that, The isolation unit includes: a first resistor, a transistor, a second resistor, and an optocoupler; the first resistor and the base of the transistor are connected; the emitter of the transistor is grounded; the collector of the transistor, the light emitter of the optocoupler, and the second resistor form a series circuit; one end of the light receiver of the optocoupler is connected to the modulation unit.

4. The system according to claim 2, characterized in that, The modulation unit includes a modulation circuit, a filtering circuit, and a comparison circuit; the reference signal passes sequentially through the modulation circuit, the filtering circuit, and the comparison circuit; the trigger signal directly enters the comparison circuit; the modulation circuit is used to modulate the value of the reference signal; the filtering circuit is used to filter the signal. The comparison circuit is used to determine whether the trigger signal is greater than a reference value.

5. The system according to claim 4, characterized in that, The adjustment circuit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a three-terminal adjustable shunt reference source, and a transistor; one end of the third resistor and the fourth resistor are respectively connected to the base of the transistor, and the other end is grounded; one end of the fifth resistor is connected to the collector of the transistor, and the other end is grounded; one end of the sixth resistor is connected to the collector of the transistor, and the other end is connected to one end of the seventh resistor, the other end of the seventh resistor is grounded; the cathode of the three-terminal adjustable shunt reference source is connected to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the seventh capacitor, and the tenth capacitor, the seventh capacitor, the tenth capacitor, the seventh capacitor, the tenth capacitor, the sixth capacitor, the seventh capacitor, the seventh capacitor, the tenth ... The collector of the transistor is connected to the collector of the transistor. The anode of the three-terminal adjustable shunt reference source is connected to the emitter of the transistor. The three-terminal adjustable shunt reference source is connected to the sixth resistor and the seventh resistor respectively. The eighth resistor, the ninth resistor, and the tenth resistor are connected end to end in sequence. The first end of the eighth resistor is connected to the collector of the transistor, and the last end of the tenth resistor is connected to the filter circuit. One end of the first capacitor is connected to the last end of the eighth resistor and the first end of the ninth resistor respectively, and the other end is grounded. One end of the second capacitor is connected to the last end of the tenth resistor, and the other end is grounded. The emitter of the transistor is grounded.

6. The system according to claim 1, characterized in that, The device control module includes: a sixteenth resistor, a seventeenth resistor, a transistor, and an optocoupler; the base of the transistor is connected to the sixteenth resistor; one end of the collector of the transistor is connected to the seventeenth resistor and one end of the light emitter of the optocoupler; the emitter of the transistor is grounded; the other end of the light emitter of the optocoupler is grounded.

7. A method based on claim 1 The synchronous triggering method for a pulse wind tunnel according to any one of the systems described in 6 is characterized in that, include: Receive trigger level; Based on the trigger level, determine whether the trigger level has reached a preset reference value; When the trigger level reaches the reference value, the light source is controlled to start and stop synchronously, and the control device is controlled to start and stop according to a preset delay.

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