A delay ignition circuit for fire extinguishing bomb

Abstract

The utility model discloses a kind of delay detonation circuits of fire extinguishing bomb, the circuit includes: crystal oscillator module, with controller connection, for timing;Pin detection module, with the controller connection, for detecting pin, and level signal is sent to the controller, and the pin is located on the delivery mechanism of fire extinguishing bomb;Ignition module is connected with electronic ignition head and the controller respectively, power module is connected with crystal oscillator module, pin detection module, ignition module and controller respectively, for power supply for crystal oscillator module, pin detection module, ignition module and controller.The circuit can improve the delay detonation reliability of fire extinguishing bomb, to ensure the fire extinguishing effect of fire extinguishing bomb.

Description

Technical Field

[0001] This utility model belongs to the field of fire extinguishing bomb technology, specifically relating to a delayed detonation circuit for a fire extinguishing bomb. Background Technology

[0002] Fire extinguishing bombs are a commonly used fire extinguishing product, convenient to use and effective. They are usually dropped from above the fire scene by fire helicopters or drones to extinguish the fire. However, the detonation point of the fire extinguishing bomb after being dropped directly affects the fire extinguishing effect. If the detonation point is too high or too low, the fire extinguishing effect will be greatly affected. The delay method in the existing technology is somewhat cumbersome and prone to delay failure, which can cause the detonation point of the fire extinguishing bomb to deviate.

[0003] Therefore, how to improve the reliability of delayed detonation of fire extinguishing bombs is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem of low reliability of delayed detonation of fire extinguishing bombs in the prior art. To this end, this invention provides a delayed detonation circuit for fire extinguishing bombs, which includes:

[0005] The crystal oscillator module, connected to the controller, is used for timing.

[0006] A pin detection module, connected to the controller, is used to detect pins and send an electrical signal to the controller. The pin is located on the fire extinguishing bomb's dispensing mechanism.

[0007] The ignition module is connected to both the electronic ignition head and the controller.

[0008] The power supply module is connected to the crystal oscillator module, pin detection module, ignition module, and controller respectively, and is used to supply power to the crystal oscillator module, pin detection module, ignition module, and controller.

[0009] Furthermore, the crystal oscillator module specifically includes:

[0010] One end of capacitor C1 is connected to port 2 of crystal oscillator X1, port 4 of crystal oscillator X1 and one end of capacitor C6 respectively. One end of capacitor C1 is also grounded. The other end of capacitor C1 is connected to port 1 of crystal oscillator X1, one end of resistor R2 and controller respectively. The other end of capacitor C6 is connected to the other end of crystal oscillator X1, the other end of resistor R2 and controller respectively.

[0011] Furthermore, the pin detection module specifically includes:

[0012] The JP2 terminal of the photoelectric sensor is grounded at port 2. The JP2 terminal of the photoelectric sensor is connected to a 5V power supply and one end of resistor R17. The JP2 terminal of the photoelectric sensor is connected to the other end of resistor R17 and one end of resistor R15. The other end of resistor R15 is connected to one end of resistor R16 and the gate of MOSFET Q2. The other end of resistor R16 is grounded and also connected to the source of MOSFET Q2. The drain of MOSFET Q2 is connected to the controller and the other end of resistor R1. One end of resistor R1 is connected to a 3.3V power supply.

[0013] Furthermore, the ignition module specifically includes:

[0014] One end of resistor R11 is connected to the controller, and the other end of resistor R11 is connected to one end of resistor R12 and the gate of MOSFET Q1. The other end of resistor R12 and the source of MOSFET Q1 are both grounded. The drain of MOSFET Q1 is connected to port 1 of terminal P2 of the electronic ignition head. Port 2 of terminal P2 is grounded to 4.2V and one end of capacitor C19, and the other end of capacitor C19 is grounded.

[0015] Furthermore, the power module specifically includes a 4.2V battery power supply terminal, a boost circuit, and a buck circuit. The boost circuit is used to boost the 4.2V power supplied by the 4.2V battery power supply terminal to a 5V power supply and output it. The buck circuit is used to buck the 5V power supply output by the boost circuit to a 3.3V power supply and output it.

[0016] Furthermore, the boost circuit specifically includes:

[0017] Port 1 of terminal P1 is connected to port 1 of switch S1. Port 2 of switch S1 is connected to one end of capacitor C9, one end of capacitor C10, one end of capacitor C11, and pin 4 of chip U2. Port 2 of terminal P1 is grounded and is also connected to the other end of capacitor C9, the other end of capacitor C10, the other end of capacitor C11, the other end of resistor R7, pin 2 of chip U2, the other end of resistor R8, the other end of capacitor C12, the other end of capacitor C13, and the other end of capacitor C14. The other end is connected to the following: one end of resistor R7 is connected to pin 6 of chip U2; pins 5 and 4 of chip U2 are both connected to one end of inductor L1; the other end of inductor L1 is connected to the positive terminal of diode D1 and pin 1 of chip U2; the negative terminal of diode D1, one end of resistor R6, one end of capacitor C12, one end of capacitor C13, and one end of capacitor C14 together output a 5V power supply; and pin 3 of chip U2 is connected to the other end of resistor R6 and one end of resistor R8.

[0018] Furthermore, the step-down circuit specifically includes:

[0019] One end of capacitor C15, one end of capacitor C17, and pin 3 of chip V1 are all connected to a 5V power supply. The other end of capacitor C15, the other end of capacitor C17, pin 1 of chip V1, the other end of capacitor C16, the other end of capacitor C18, and the negative terminal of LED2 are all grounded. The positive terminal of LED2 is connected to the other end of resistor R10. One end of resistor R10, one end of capacitor C18, one end of capacitor C16, and pins 2 and 4 of chip V1 together output a 3.3V power supply.

[0020] Furthermore, the delayed detonation circuit also includes a digital tube circuit, which specifically includes:

[0021] Pin 19 of chip U3 is grounded. Pins 2 through 9 of chip U3 are all connected to the controller. Pin 10 of chip U3 is grounded and also connected to the other end of capacitor C20. One end of capacitor C20 is connected to pin 20 of chip U3 and the 3.3V power supply. Pin 18 of chip U3 is connected to one end of the first resistor in resistor array R13. Pin 17 of chip U3 is connected to one end of the second resistor in resistor array R13. Pin 16 of chip U3 is connected to one end of the third resistor in resistor array R13. Pin 15 of chip U3 is connected to one end of the fourth resistor in resistor array R13. The other end of the first resistor in resistor array R13 is connected to pin 3 of the digital tube. The other end of the second resistor in resistor array R13 is connected to pin 5 of the digital tube. The other end of the third resistor in resistor array R13 is connected to the digital tube. Pin 10 of the chip is connected to the digital tube. The other end of the fourth resistor in the resistor array is connected to pin 1 of the digital tube. Pin 14 of the chip U3 is connected to one end of the first resistor in the resistor array R14. Pin 13 of the chip U3 is connected to one end of the second resistor in the resistor array R14. Pin 12 of the chip U3 is connected to one end of the third resistor in the resistor array R14. Pin 11 of the chip U3 is connected to one end of the fourth resistor in the resistor array R14. The other end of the first resistor in the resistor array R14 is connected to pin 2 of the digital tube. The other end of the second resistor in the resistor array R14 is connected to pin 4 of the digital tube. The other end of the third resistor in the resistor array R14 is connected to pin 7 of the digital tube. The other end of the fourth resistor in the resistor array R14 is connected to pin 11 of the digital tube. Pins 6, 8, 9 and 12 of the digital tube are all connected to the controller.

[0022] Furthermore, the controller is specifically a microcontroller, and the connection of the controller is specifically as follows:

[0023] Pin 1 of the controller is connected to a 3.3V power supply; pin 2 is connected to an indicator light; pins 5 and 6 are both connected to a crystal oscillator module; pin 7 is connected to a reset button; pin 8 is grounded; pin 9 is connected to a 3.3V power supply; pins 10 to 19 are all connected to a digital tube circuit; pins 20 and 21 are both connected to a digital tube circuit; pin 23 is grounded; pin 24 is connected to a 3.3V power supply; pin 48 is connected to a 3.3V power supply; pin 47 is grounded; pin 44 is grounded through resistor R4; pin 38 is connected to an ignition module; pins 37 and 34 are both connected to a program burning interface; pins 31 and 30 are both connected to a debugging interface; and pin 25 is connected to a pin detection module.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] This invention provides a delayed detonation circuit for a fire extinguishing grenade. Compared with existing technologies, this circuit includes: a crystal oscillator module connected to a controller for timing; a pin detection module connected to the controller for detecting the pin and sending a level signal to the controller, wherein the pin is located on the fire extinguishing grenade's delivery mechanism; an ignition module connected to both the electronic ignition head and the controller; and a power supply module connected to the crystal oscillator module, pin detection module, ignition module, and controller for supplying power to these components. This circuit improves the reliability of the delayed detonation of the fire extinguishing grenade, thereby ensuring its fire extinguishing effect. Attached Figure Description

[0026] To more clearly illustrate the embodiments of this specification, the accompanying drawings used in the embodiments will be briefly introduced below. 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.

[0027] Figure 1 The diagram shown is a schematic representation of the overall structure of the delayed detonation circuit for the fire extinguishing bomb provided in the embodiments of this specification.

[0028] Figure 2 The diagram shown is a structural schematic of the crystal oscillator module provided in the embodiments of this specification;

[0029] Figure 3 The diagram shown is a structural schematic of the pin detection module provided in the embodiment of this specification;

[0030] Figure 4 The diagram shown is a structural schematic of the ignition module provided in the embodiment of this specification;

[0031] Figure 5 The diagram shown is a schematic diagram of the boost circuit provided in the embodiment of this specification;

[0032] Figure 6 The diagram shown is a schematic diagram of the step-down circuit provided in the embodiment of this specification;

[0033] Figure 7 The diagram shown is a schematic diagram of the decoupling circuit provided in the embodiment of this specification;

[0034] Figure 8 The diagram shown is a connection diagram of the controller provided in the embodiment of this specification;

[0035] Figure 9 The diagram shown is a schematic diagram of the digital tube circuit provided in the embodiment of this specification. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0037] like Figure 1 The diagram shown illustrates the overall structure of the delayed detonation circuit for the fire extinguishing bomb provided in this embodiment. While this specification provides the structure shown in the following embodiments or figures, based on conventional methods or without creative effort, the structure may include more or fewer components combined. These structures are not limited to those shown in the embodiments or figures of this specification. In practical applications of devices or terminal products, the structures described can be executed sequentially or in parallel according to the embodiments or module structures.

[0038] The delayed detonation circuit for the fire extinguishing bomb provided in the embodiments of this specification includes:

[0039] The crystal oscillator module, connected to the controller, is used for timing.

[0040] A pin detection module, connected to the controller, is used to detect pins and send an electrical signal to the controller. The pin is located on the fire extinguishing bomb's dispensing mechanism.

[0041] The ignition module is connected to both the electronic ignition head and the controller.

[0042] The power supply module is connected to the crystal oscillator module, pin detection module, ignition module, and controller respectively, and is used to supply power to the crystal oscillator module, pin detection module, ignition module, and controller.

[0043] Specifically, the pin detection module is a photoelectric sensor detection module. The pin is located on the fire extinguishing grenade's delivery mechanism and is coupled to the photoelectric sensor. When the fire extinguishing grenade is thrown, the pin disengages from the pin detection module, and the level signal sent by the pin detection module to the controller changes. After detecting the changed level signal, the controller sends a signal to the crystal oscillator module to start timing. The timing of the crystal oscillator module is stable, with an error in the millisecond range. When the timing ends, the controller receives a feedback signal from the crystal oscillator module and then sends a signal to the ignition module. The ignition module outputs a pulse current to activate the electronic ignition head, thereby detonating the fire extinguishing grenade. The electronic ignition head can be an electric detonator or a semiconductor bridge initiator. In specific application scenarios, the controller uses the AT32F421 series microcontroller. This series of microcontrollers uses an ARM® Cortex™-M4 32-bit RISC core and is equipped with 16K bytes to 64K bytes of flash memory, Slib, timers, ADCs, comparators, and multiple communication interfaces. That is to say, this series of microcontrollers can perform the above response operations without relying on algorithms; it can be done solely by circuitry.

[0044] In the embodiments of this application, such as Figure 2 The diagram shown is a structural schematic of a crystal oscillator module, which specifically includes:

[0045] One end of capacitor C1 is connected to port 2 of crystal oscillator X1, port 4 of crystal oscillator X1 and one end of capacitor C6 respectively. One end of capacitor C1 is also grounded. The other end of capacitor C1 is connected to port 1 of crystal oscillator X1, one end of resistor R2 and controller respectively. The other end of capacitor C6 is connected to the other end of crystal oscillator X1, the other end of resistor R2 and controller respectively.

[0046] like Figure 3 The diagram shown illustrates the structure of the pin detection module, which specifically includes:

[0047] The JP2 terminal of the photoelectric sensor is grounded at port 2. The JP2 terminal of the photoelectric sensor is connected to a 5V power supply and one end of resistor R17. The JP2 terminal of the photoelectric sensor is connected to the other end of resistor R17 and one end of resistor R15. The other end of resistor R15 is connected to one end of resistor R16 and the gate of MOSFET Q2. The other end of resistor R16 is grounded and also connected to the source of MOSFET Q2. The drain of MOSFET Q2 is connected to the controller and the other end of resistor R1. One end of resistor R1 is connected to a 3.3V power supply.

[0048] like Figure 4 The diagram shown is a structural schematic of an ignition module, which specifically includes:

[0049] One end of resistor R11 is connected to the controller, and the other end of resistor R11 is connected to one end of resistor R12 and the gate of MOSFET Q1. The other end of resistor R12 and the source of MOSFET Q1 are both grounded. The drain of MOSFET Q1 is connected to port 1 of terminal P2 of the electronic ignition head. Port 2 of terminal P2 is grounded to 4.2V and one end of capacitor C19, and the other end of capacitor C19 is grounded.

[0050] In this embodiment of the application, the power module specifically includes a 4.2V battery power supply terminal, a boost circuit, and a buck circuit. The boost circuit is used to boost the 4.2V power supplied by the 4.2V battery power supply terminal to a 5V power supply and output it. The buck circuit is used to buck the 5V power supply output by the boost circuit to a 3.3V power supply and output it.

[0051] like Figure 5 The diagram shown is a schematic of a boost circuit, which specifically includes:

[0052] Port 1 of terminal P1 is connected to port 1 of switch S1. Port 2 of switch S1 is connected to one end of capacitor C9, one end of capacitor C10, one end of capacitor C11, and pin 4 of chip U2. Port 2 of terminal P1 is grounded and is also connected to the other end of capacitor C9, the other end of capacitor C10, the other end of capacitor C11, the other end of resistor R7, pin 2 of chip U2, the other end of resistor R8, the other end of capacitor C12, the other end of capacitor C13, and the other end of capacitor C14. The other end is connected to the following: one end of resistor R7 is connected to pin 6 of chip U2; pins 5 and 4 of chip U2 are both connected to one end of inductor L1; the other end of inductor L1 is connected to the positive terminal of diode D1 and pin 1 of chip U2; the negative terminal of diode D1, one end of resistor R6, one end of capacitor C12, one end of capacitor C13, and one end of capacitor C14 together output a 5V power supply; and pin 3 of chip U2 is connected to the other end of resistor R6 and one end of resistor R8.

[0053] like Figure 6 The diagram shown is a schematic of a step-down circuit, which specifically includes:

[0054] One end of capacitor C15, one end of capacitor C17, and pin 3 of chip V1 are all connected to a 5V power supply. The other end of capacitor C15, the other end of capacitor C17, pin 1 of chip V1, the other end of capacitor C16, the other end of capacitor C18, and the negative terminal of LED2 are all grounded. The positive terminal of LED2 is connected to the other end of resistor R10. One end of resistor R10, one end of capacitor C18, one end of capacitor C16, and pins 2 and 4 of chip V1 together output a 3.3V power supply.

[0055] In addition, the circuit of this application also includes a digital tube circuit for displaying timing or countdown, such as... Figure 9 The diagram shown is a schematic of a digital tube circuit, which specifically includes:

[0056] Pin 19 of chip U3 is grounded. Pins 2 through 9 of chip U3 are all connected to the controller. Pin 10 of chip U3 is grounded and also connected to the other end of capacitor C20. One end of capacitor C20 is connected to pin 20 of chip U3 and the 3.3V power supply. Pin 18 of chip U3 is connected to one end of the first resistor in resistor array R13. Pin 17 of chip U3 is connected to one end of the second resistor in resistor array R13. Pin 16 of chip U3 is connected to one end of the third resistor in resistor array R13. Pin 15 of chip U3 is connected to one end of the fourth resistor in resistor array R13. The other end of the first resistor in resistor array R13 is connected to pin 3 of the digital tube. The other end of the second resistor in resistor array R13 is connected to pin 5 of the digital tube. The other end of the third resistor in resistor array R13 is connected to the digital tube. Pin 10 of the chip is connected to the digital tube. The other end of the fourth resistor in the resistor array is connected to pin 1 of the digital tube. Pin 14 of the chip U3 is connected to one end of the first resistor in the resistor array R14. Pin 13 of the chip U3 is connected to one end of the second resistor in the resistor array R14. Pin 12 of the chip U3 is connected to one end of the third resistor in the resistor array R14. Pin 11 of the chip U3 is connected to one end of the fourth resistor in the resistor array R14. The other end of the first resistor in the resistor array R14 is connected to pin 2 of the digital tube. The other end of the second resistor in the resistor array R14 is connected to pin 4 of the digital tube. The other end of the third resistor in the resistor array R14 is connected to pin 7 of the digital tube. The other end of the fourth resistor in the resistor array R14 is connected to pin 11 of the digital tube. Pins 6, 8, 9 and 12 of the digital tube are all connected to the controller.

[0057] like Figure 8 The diagram shows the connection of the controller, which is specifically a microcontroller. The connection of the controller is as follows:

[0058] Pin 1 of the controller is connected to a 3.3V power supply; pin 2 is connected to an indicator light; pins 5 and 6 are both connected to a crystal oscillator module; pin 7 is connected to a reset button; pin 8 is grounded; pin 9 is connected to a 3.3V power supply; pins 10 to 19 are all connected to a digital tube circuit; pins 20 and 21 are both connected to a digital tube circuit; pin 23 is grounded; pin 24 is connected to a 3.3V power supply; pin 48 is connected to a 3.3V power supply; pin 47 is grounded; pin 44 is grounded through resistor R4; pin 38 is connected to an ignition module; pins 37 and 34 are both connected to a program burning interface; pins 31 and 30 are both connected to a debugging interface; and pin 25 is connected to a pin detection module.

[0059] The aforementioned program programming interface is a single provided interface. Each pin in the controller connected to the 3.3V power supply is also connected to a decoupling circuit. Each decoupling circuit has the same structure, such as... Figure 7 The diagram shows an exemplary decoupling circuit, which includes: one end of capacitor C2, one end of capacitor C3, one end of capacitor C4, and one end of capacitor C5 are all connected to a 3.3V power supply, that is, connected to the pin of the controller that is connected to the 3.3V power supply; the other ends of capacitor C2, capacitor C3, capacitor C4, and capacitor C5 are all grounded to smooth voltage changes.

[0060] It should be understood that when an element is referred to as “fixed to” or “set on” another element, it may be directly on the other element or may be interposed with an intervening element; when an element is referred to as “connected to” another element, it may be directly connected to the other element or may be interposed with an intervening element. Furthermore, the term “connected” as used herein may include wireless connections; the word “and / or” as used includes any and all combinations of one or more of the associated listed items.

[0061] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0062] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0063] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0064] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

[0067] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A delay ignition circuit for a fire extinguishing bomb, characterized in that, The delayed detonation circuit includes: The crystal oscillator module, connected to the controller, is used for timing. A pin detection module, connected to the controller, is used to detect pins and send an electrical signal to the controller. The pin is located on the fire extinguishing bomb's dispensing mechanism. The ignition module is connected to both the electronic ignition head and the controller. The power supply module is connected to the crystal oscillator module, pin detection module, ignition module, and controller respectively, and is used to supply power to the crystal oscillator module, pin detection module, ignition module, and controller.

2. The delay ignition circuit of the fire extinguishing bomb according to claim 1, wherein The crystal oscillator module specifically includes: One end of capacitor C1 is connected to port 2 of crystal oscillator X1, port 4 of crystal oscillator X1 and one end of capacitor C6 respectively. One end of capacitor C1 is also grounded. The other end of capacitor C1 is connected to port 1 of crystal oscillator X1, one end of resistor R2 and controller respectively. The other end of capacitor C6 is connected to the other end of crystal oscillator X1, the other end of resistor R2 and controller respectively.

3. The delay ignition circuit of the fire extinguishing bomb according to claim 1, wherein The pin detection module specifically includes: The JP2 terminal of the photoelectric sensor is grounded at port 2. The JP2 terminal of the photoelectric sensor is connected to a 5V power supply and one end of resistor R17. The JP2 terminal of the photoelectric sensor is connected to the other end of resistor R17 and one end of resistor R15. The other end of resistor R15 is connected to one end of resistor R16 and the gate of MOSFET Q2. The other end of resistor R16 is grounded and also connected to the source of MOSFET Q2. The drain of MOSFET Q2 is connected to the controller and the other end of resistor R1. One end of resistor R1 is connected to a 3.3V power supply.

4. The delay ignition circuit of the fire extinguishing bomb according to claim 1, wherein The ignition module specifically includes: One end of resistor R11 is connected to the controller, and the other end of resistor R11 is connected to one end of resistor R12 and the gate of MOSFET Q1. The other end of resistor R12 and the source of MOSFET Q1 are both grounded. The drain of MOSFET Q1 is connected to port 1 of terminal P2 of the electronic ignition head. Port 2 of terminal P2 is grounded to 4.2V and one end of capacitor C19, and the other end of capacitor C19 is grounded.

5. The delay ignition circuit of the fire extinguishing bomb according to claim 1, wherein The power module specifically includes a 4.2V battery power supply terminal, a boost circuit, and a buck circuit. The boost circuit is used to boost the 4.2V power supplied by the 4.2V battery power supply terminal to 5V power and output it. The buck circuit is used to buck the 5V power output by the boost circuit to 3.3V power and output it.

6. The delay ignition circuit of the fire extinguishing bomb according to claim 5, wherein The boost circuit specifically includes: Port 1 of terminal P1 is connected to port 1 of switch S1. Port 2 of switch S1 is connected to one end of capacitor C9, one end of capacitor C10, one end of capacitor C11, and pin 4 of chip U2. Port 2 of terminal P1 is grounded and is also connected to the other end of capacitor C9, the other end of capacitor C10, the other end of capacitor C11, the other end of resistor R7, pin 2 of chip U2, the other end of resistor R8, the other end of capacitor C12, the other end of capacitor C13, and the other end of capacitor C14. The other end is connected to the following: one end of resistor R7 is connected to pin 6 of chip U2; pins 5 and 4 of chip U2 are both connected to one end of inductor L1; the other end of inductor L1 is connected to the positive terminal of diode D1 and pin 1 of chip U2; the negative terminal of diode D1, one end of resistor R6, one end of capacitor C12, one end of capacitor C13, and one end of capacitor C14 together output a 5V power supply; and pin 3 of chip U2 is connected to the other end of resistor R6 and one end of resistor R8.

7. The delay ignition circuit of the fire extinguishing bomb according to claim 5, wherein The step-down circuit specifically includes: One end of capacitor C15, one end of capacitor C17, and pin 3 of chip V1 are all connected to a 5V power supply. The other end of capacitor C15, the other end of capacitor C17, pin 1 of chip V1, the other end of capacitor C16, the other end of capacitor C18, and the negative terminal of LED2 are all grounded. The positive terminal of LED2 is connected to the other end of resistor R10. One end of resistor R10, one end of capacitor C18, one end of capacitor C16, and pins 2 and 4 of chip V1 together output a 3.3V power supply.

8. The delay ignition circuit of the fire extinguishing bomb according to claim 1, wherein The delayed detonation circuit also includes a digital tube circuit, which specifically includes: Pin 19 of chip U3 is grounded. Pins 2 to 9 of chip U3 are all connected to the controller. Pin 10 of chip U3 is grounded and also connected to the other end of capacitor C20. One end of capacitor C20 is connected to pin 20 of chip U3 and the 3.3V power supply. Pin 18 of chip U3 is connected to one end of the first resistor in resistor array R13. Pin 17 of chip U3 is connected to one end of the second resistor in resistor array R13. Pin 16 of chip U3 is connected to one end of the third resistor in resistor array R13. Pin 15 of chip U3 is connected to one end of the fourth resistor in resistor array R13. The other end of the first resistor in resistor array R13 is connected to pin 3 of the digital tube. The other end of the second resistor in resistor array R13 is connected to pin 5 of the digital tube. The other end of the third resistor in resistor array R13 is connected to pin 3 of the digital tube. Pin 10 is connected. The other end of the fourth resistor in the resistor array R13 is connected to pin 1 of the digital tube. Pin 14 of the chip U3 is connected to one end of the first resistor in the resistor array R14. Pin 13 of the chip U3 is connected to one end of the second resistor in the resistor array R14. Pin 12 of the chip U3 is connected to one end of the third resistor in the resistor array R14. Pin 11 of the chip U3 is connected to one end of the fourth resistor in the resistor array R14. The other end of the first resistor in the resistor array R14 is connected to pin 2 of the digital tube. The other end of the second resistor in the resistor array R14 is connected to pin 4 of the digital tube. The other end of the third resistor in the resistor array R14 is connected to pin 7 of the digital tube. The other end of the fourth resistor in the resistor array R14 is connected to pin 11 of the digital tube. Pins 6, 8, 9, and 12 of the digital tube are all connected to the controller.

9. The delayed detonation circuit of the fire extinguishing bomb as described in claim 8, characterized in that, The controller is specifically a microcontroller, and the connection of the controller is as follows: Pin 1 of the controller is connected to a 3.3V power supply; pin 2 is connected to an indicator light; pins 5 and 6 are both connected to a crystal oscillator module; pin 7 is connected to a reset button; pin 8 is grounded; pin 9 is connected to a 3.3V power supply; pins 10 to 19 are all connected to a digital tube circuit; pins 20 and 21 are both connected to a digital tube circuit; pin 23 is grounded; pin 24 is connected to a 3.3V power supply; pin 48 is connected to a 3.3V power supply; pin 47 is grounded; pin 44 is grounded through resistor R4; pin 38 is connected to an ignition module; pins 37 and 34 are both connected to a program burning interface; pins 31 and 30 are both connected to a debugging interface; and pin 25 is connected to a pin detection module.

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