Initiation device control apparatus and method

Abstract

The application relates to the field of mining metallurgy and defense weapons, and particularly relates to a device and a method for controlling an initiating explosive inside an external time sequence control equipment, which comprises: a control switch connected in parallel with the initiating explosive; a selection switch connected in series with the control switch to form an activation control circuit; an external time sequence circuit connected with the activation control circuit to form a first loop; and a resistance value test circuit connected with the activation control circuit to form a second loop, wherein the resistance value test circuit comprises a test switch and a constant current source connected in series, and a voltage test circuit connected in parallel at both ends of the constant current source; and the initiating explosive is configured into a control, activation or test state by controlling the conduction of the selection switch, the control switch and the test switch. The application can realize safe control of the initiating explosive under abnormal conditions such as static electricity or large current in the circuit without increasing the number of internal control components of the existing equipment.

Description

Technical Field

[0001] This application relates to the fields of mining and metallurgy, and defense weapons, specifically to a device and method for controlling pyrotechnics within an external timing control device. Background Technology

[0002] In the fields of mining, metallurgy, and defense weaponry, some equipment is controlled by external timing circuits while containing internal pyrotechnics. Compared to general loads, these internal pyrotechnics are more prone to combustion or explosion when stimulated by external timing circuits, exhibiting characteristics of high energy density and significant danger. During the transportation, storage, and operation of this equipment, it is necessary to implement safety controls to prevent accidental triggering of internal pyrotechnics and ensure their safety and reliability, thus avoiding accidents.

[0003] Existing methods for controlling the external timing of pyrotechnics can achieve effective control under normal operating conditions. However, when faced with abnormalities such as static electricity or high current during equipment transportation, storage, and operation, pyrotechnics may be accidentally activated, posing a significant safety hazard. Summary of the Invention

[0004] This application provides a device and method for controlling pyrotechnic items within an external timing control device, which can solve the technical problem in the prior art where pyrotechnic items are accidentally activated when abnormalities such as static electricity or high current occur during the transportation, storage, and operation of the equipment.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a pyrotechnics control device internally controlled by an external timing control device, comprising: Control switch, used in parallel with pyrotechnic devices; The selector switch, which is connected in series with the control switch, forms an activation control circuit. An external timing circuit is used to connect with the activation control circuit to form a first loop; A resistance testing circuit, which is connected to the activation control circuit to form a second loop, the resistance testing circuit includes a test switch and a constant current source connected in series, and a voltage testing circuit connected in parallel across the constant current source. By controlling the conduction status of the selector switch, control switch, and test switch, the pyrotechnic device can be configured into a control, activation, or test state.

[0006] In some alternative solutions, the pyrotechnic control device inside the external timing control equipment also includes a controller connected to the voltage testing circuit for calculating the resistance value of the corresponding pyrotechnic to be tested based on the voltage across the constant current source.

[0007] In some alternative solutions, a test switch is connected in series at each end of the constant current source.

[0008] In some alternative solutions, a current-limiting resistor is provided between the activation positive terminal of the external timing circuit and the activation control circuit.

[0009] In some alternative solutions, when the equipment is in operation, the external timing circuit is connected to the activation control circuit to configure the pyrotechnic device in a controlled, activated, or tested state; when the equipment is in transport or storage, the external timing circuit is disconnected from the activation control circuit to configure the pyrotechnic device in a controlled state.

[0010] In some optional solutions, when the pyrotechnic device is configured in a controlled state, the control switch is turned on, the selection switch is turned off, the test switch is turned off, the pyrotechnic device is disconnected from the external timing circuit, and the pyrotechnic device will not be activated. When the pyrotechnic device is configured to be activated, the external timing circuit has an output, the selector switch is turned on, the control switch is turned off, the test switch is turned off, the external timing circuit supplies power to the pyrotechnic device, and the pyrotechnic device is activated. When the pyrotechnic device is configured for testing, the external timing circuit has no output, the control switch is open, the selection switch is on, and the test switch is on. The internal resistance of the pyrotechnic device is then detected by the resistance testing circuit.

[0011] Secondly, the present invention also includes a method for controlling pyrotechnic devices within an external timing control device, the method comprising the following steps: The pyrotechnic device is connected in parallel with the control switch, and the selector switch is connected in series with the control switch to form an activation control circuit. The activation control circuit is connected to an external timing circuit to form a first loop, and the activation control circuit is connected to a resistance test circuit to form a second loop. The resistance test circuit includes a test switch and a constant current source connected in series, and a voltage test circuit connected in parallel across the constant current source. By controlling the conduction status of the selector switch, control switch, and test switch, the pyrotechnic device can be configured into a control, activation, or test state.

[0012] In some alternative embodiments, the method for controlling pyrotechnic materials further includes the following steps: When the equipment is in operation, the external timing circuit is connected to the activation control circuit to configure the pyrotechnic device into a controlled, activated, or tested state. When the equipment is in transport or storage, the external timing circuit is disconnected from the activation control circuit, and the pyrotechnic device is configured to a controlled state.

[0013] In some alternative solutions, an external timing circuit is connected to an activation control circuit to configure the pyrotechnic device into a controlled, activated, or tested state, including: When the pyrotechnic device is configured to the controlled state, the control switch is turned on, the selector switch is turned off, the test switch is turned off, the pyrotechnic device is disconnected from the external timing circuit, and the pyrotechnic device will not be activated. When the pyrotechnic device is configured to be activated, the external timing circuit has an output, the selector switch is turned on, the control switch is turned off, and the test switch is turned off. At this time, the external timing circuit supplies power to the pyrotechnic device, and the pyrotechnic device is activated. When the pyrotechnic device is configured for testing, the external timing circuit has no output, the control switch is open, the selection switch is on, and the test switch is on. The internal resistance of the pyrotechnic device is then detected by the resistance testing circuit.

[0014] In some alternative solutions, the internal resistance of the pyrotechnic item is detected by the resistance testing circuit, including: The voltage across the constant current source is acquired using a voltage testing circuit; The controller calculates the resistance value of the corresponding pyrotechnic device under test based on the voltage across the constant current source collected by the voltage testing circuit.

[0015] Compared with existing technologies, the advantages of this invention are as follows: This solution achieves intelligent switching and interlocking protection of the safety status of pyrotechnics through a simple switch combination, solving the fundamental contradiction of difficulty in balancing safety and function in traditional pyrotechnic systems; by connecting the selector switch and the control switch in series to form a redundant safety link, in the control state the control switch conducts to short-circuit the two ends of the pyrotechnic, while the selector switch is open to cut off the external power supply, forming a dual safety protection mechanism. Even if one switch fails, the other switch can still effectively block the abnormal current path and prevent the pyrotechnic from being accidentally triggered. At the same time, by using a safe current to test the resistance value through a dedicated test circuit, not only is multi-level safety control achieved without increasing the number of components, but also the dependence on manual on-site operation and safety hazards are greatly reduced, significantly improving the safety and reliability of pyrotechnics under various working conditions and ensuring the safe operation of the equipment throughout its entire life cycle. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a pyrotechnic control device inside an external timing control device in an embodiment of the present invention.

[0018] Figure 2 This is an equivalent diagram of the activation circuit of a pyrotechnic device when it is configured in a controlled state in an embodiment of the present invention.

[0019] Figure 3 This is an equivalent diagram of the activation circuit of a pyrotechnic device when it is configured in an activated state in an embodiment of the present invention.

[0020] Figure 4 This is an equivalent diagram of the activation circuit of a pyrotechnic device when it is configured in a test state in an embodiment of the present invention. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0023] The existing equipment has an external timing control circuit, and the internal components include a pyrotechnic busbar, a control switch, and a selector switch. The traditional control method is that the internal pyrotechnic components and control switches are connected in parallel with the external timing circuit, and the internal pyrotechnic busbar is connected to the control switch through a current-limiting resistor and a selector switch.

[0024] like Figures 1 to 4 As shown, in one aspect, the present invention provides a pyrotechnic control device internally controlled by an external timing control device, comprising: a control switch, a selection switch, an external timing circuit, and a resistance testing circuit. The control switch is connected in parallel with the pyrotechnic item; the selection switch and the control switch are connected in series to form an activation control circuit; the external timing circuit is connected to the activation control circuit to form a first loop; the resistance testing circuit is connected to the activation control circuit to form a second loop. The resistance testing circuit includes a test switch and a constant current source connected in series, and a voltage testing circuit connected in parallel across the constant current source. By controlling the conduction of the selection switch, the control switch, and the test switch, the pyrotechnic item is configured to a control, activation, or testing state.

[0025] In this solution, a redundant safety link is formed by connecting the selector switch and the control switch in series. In the control state, the control switch is turned on to short-circuit the two ends of the pyrotechnic device, while the selector switch is turned off to cut off the external power supply, forming a dual safety protection mechanism. Even if one switch fails, the other switch can still effectively block the abnormal current path and prevent the pyrotechnic device from being accidentally triggered. At the same time, the resistance value is tested using a safe current through a dedicated test circuit. This not only achieves multi-level safety control without increasing the number of components, but also significantly reduces the reliance on manual on-site operation and safety hazards, significantly improving the safety and reliability of the pyrotechnic device under various working conditions and ensuring the safe operation of the equipment throughout its entire life cycle.

[0026] In this example, Figures 1 to 4 The signal processing circuit in the circuit is the voltage testing circuit.

[0027] In some optional embodiments, the pyrotechnic control device inside the external timing control equipment also includes a controller connected to a voltage testing circuit for calculating the resistance value of the corresponding pyrotechnic under test based on the voltage across the constant current source.

[0028] This invention introduces a controller connected to a voltage testing circuit in a pyrotechnic control device. A constant current source provides a known milliampere-level safe test current. When the test switch is turned on, the controller acquires the voltage across the constant current source measured by the voltage testing circuit. Using Ohm's law, it automatically calculates the precise resistance of the pyrotechnic item. This not only ensures that the test current is far below the pyrotechnic item's activation threshold, preventing false triggering, but also achieves full automation of the testing process and data traceability. This significantly reduces the electrostatic risks associated with manual on-site operation, improves testing efficiency and accuracy, and enables the equipment to complete self-checks of the pyrotechnic item's status without disassembly or external testing instruments. This significantly enhances the safety monitoring and fault warning capabilities of the pyrotechnic item system.

[0029] In some alternative embodiments, a test switch is connected in series across each end of the constant current source.

[0030] In this solution, a dual safety isolation mechanism is formed by two test switches to ensure that the test circuit is only fully connected when testing is required. When both test switches are on simultaneously, the constant current source, current-limiting resistor, and pyrotechnic device form a complete test circuit. Since the constant current source provides a safe current in the milliampere range, which is far below the activation threshold of the pyrotechnic device, it can accurately measure the resistance of the pyrotechnic device and avoid the risk of accidental activation of the pyrotechnic device during testing. When either test switch is off, the test circuit is effectively cut off, preventing the test circuit from affecting the pyrotechnic device in non-test states. At the same time, the dual-switch design also provides fault redundancy. When one test switch experiences a sticking fault, the other switch can still ensure the safe disconnection of the test circuit, greatly reducing the safety hazards caused by single-point failures.

[0031] In some alternative embodiments, a current-limiting resistor is provided between the activation positive terminal of the external timing circuit and the activation control circuit.

[0032] In this solution, Ohm's law is used to physically limit abnormal currents that may enter the pyrotechnic device. When the external timing circuit outputs a normal activation signal, the resistance value of the current-limiting resistor is precisely designed so as not to affect the normal activation function. When encountering electrostatic discharge, which is usually high voltage or abnormally large current, the current-limiting resistor can effectively limit the current below the activation threshold of the pyrotechnic device. Even if the selector switch and the control switch are both in an abnormal conducting state, it can prevent the pyrotechnic device from being accidentally activated, thus forming a triple protection system with the dual-switch safety mechanism. This can improve the system's fault tolerance to abnormal situations without adding additional control logic or components, and significantly improve safety without changing the original system workflow. It enables the pyrotechnic device system to effectively resist various electrical interferences throughout the transportation, storage, and operation processes, providing a more reliable technical guarantee for the application of pyrotechnic devices with high safety requirements.

[0033] In some optional embodiments, when the device is in operation, the external timing circuit is connected to the activation control circuit to configure the pyrotechnic item into a controlled, activated, or tested state; when the device is in transport or storage, the external timing circuit is disconnected from the activation control circuit to configure the pyrotechnic item into a controlled state.

[0034] In this solution, when the equipment is in transport or storage, the external timing circuit and the activation control circuit are physically disconnected. At the same time, the pyrotechnic device is forcibly configured into a controlled state. The control switch is turned on to short-circuit the pyrotechnic device, and the selector switch is turned off to cut off the external power supply path, forming a double safety guarantee. Even if a strong electrostatic discharge or accidental current interference occurs, an effective activation circuit cannot be formed. When the equipment enters the working state, the external timing circuit is reconnected, and the system can flexibly switch between controlled, activated, or tested states according to actual needs, ensuring operational functions while maintaining the necessary safety level.

[0035] In some optional embodiments, when the pyrotechnic device is configured in a controlled state, the controlled switch is on, the selector switch is off, and the test switch is off, so the pyrotechnic device is disconnected from the external timing circuit and will not be activated. When the pyrotechnic device is configured in an activated state, the external timing circuit has an output, the selector switch is on, the controlled switch is off, and the test switch is off, so the external timing circuit supplies power to the pyrotechnic device and activates it. When the pyrotechnic device is configured in a test state, the external timing circuit has no output, the controlled switch is off, the selector switch is on, and the test switch is on, so the internal resistance of the pyrotechnic device is detected by the resistance test circuit.

[0036] In this scheme, under controlled conditions, the control switch is turned on to short-circuit the pyrotechnic device while the selector switch is turned off to cut off the external power supply, forming a double physical isolation to ensure safety. Even in the event of strong static electricity, it will not be activated. Under activated conditions, the selector switch is turned on while the control switch is turned off, allowing the external timing circuit to reliably provide the activation voltage, while the test switch is turned off to avoid interference. Under tested conditions, with no output from the external timing circuit to ensure safety, the test switch is turned on to enable the small current test circuit to work, achieving accurate measurement of the pyrotechnic device's resistance without triggering it. This three-state separation and interlocking protection design not only achieves a balance between reliable safety, precise and controllable working conditions, and safe and convenient testing conditions, but also replaces complex electronic control with switch logic combinations, reducing system complexity and failure rate.

[0037] See you again Figures 1 to 4 Secondly, the present invention also provides a method for controlling pyrotechnic items within an external timing control device, the method comprising the following steps: S1: Connect the pyrotechnic device and the control switch in parallel, and connect the selector switch and the control switch in series to form an activation control circuit.

[0038] In this step, when the pyrotechnic device is connected in parallel with the control switch, the control switch will short-circuit the two ends of the pyrotechnic device when it is in the conducting state, forming a current bypass. This ensures that any abnormal current will preferentially pass through the low-impedance control switch rather than flow through the pyrotechnic device, thus fundamentally preventing the accidental activation of the pyrotechnic device. S2: The activation control circuit is connected to the external timing circuit to form the first loop, and the activation control circuit is connected to the resistance test circuit to form the second loop. The resistance test circuit includes a test switch and a constant current source connected in series, and a voltage test circuit connected in parallel across the constant current source.

[0039] The internal pyrotechnic resistance testing circuit includes a constant current source, a signal processing circuit, and a controller. Each end of the constant current source is connected to one end of a test switch, and the other ends of the two test switches are respectively connected to the positive and negative ends of the internal busbar. The constant current source and the signal processing circuit are connected in parallel, and the controller is connected to the signal processing circuit.

[0040] S3: By controlling the conduction status of the selector switch, control switch, and test switch, the pyrotechnic device can be configured to control, activate, or test states.

[0041] When the equipment is in operation, the external timing circuit is connected to the activation control circuit to configure the pyrotechnic device into a controlled, activated, or tested state.

[0042] Specifically, this includes: when the pyrotechnic device is configured in the controlled state, the controlled switch is on, the selector switch is off, and the test switch is off, the pyrotechnic device is disconnected from the external timing circuit, and the pyrotechnic device will not be activated; when the pyrotechnic device is configured in the activated state, the external timing circuit has an output, the selector switch is on, the controlled switch is off, and the test switch is off, at which time the external timing circuit supplies power to the pyrotechnic device, and the pyrotechnic device is activated; when the pyrotechnic device is configured in the test state, the external timing circuit has no output, the controlled switch is off, the selector switch is on, and the test switch is on, and the internal resistance value of the pyrotechnic device is detected by the resistance test circuit.

[0043] When the equipment is in transport or storage, the external timing circuit is disconnected from the activation control circuit, and the pyrotechnic device is configured to a controlled state.

[0044] In some optional embodiments, the internal resistance of the pyrotechnic item is detected by a resistance testing circuit, including: acquiring the voltage across a constant current source using a voltage testing circuit; and the controller calculating the resistance of the corresponding pyrotechnic item based on the voltage across the constant current source acquired by the voltage testing circuit.

[0045] This solution achieves intelligent switching and interlocking protection of the safety status of pyrotechnics through a simple switch combination, resolving the fundamental contradiction of balancing safety and functionality in traditional pyrotechnic systems. By precisely controlling the conduction states of three switches, the system can construct three physically isolated operating modes: In the controlled state: the controlled switch is on, the selector switch is off, and the test switch is off. The pyrotechnic is short-circuited and completely isolated from the external power supply, forming a double safety guarantee. Even in the event of strong electrostatic interference, the pyrotechnic cannot be activated, thus resolving the risk of accidental triggering during transportation and storage. In the activated state: the selector switch is on, the controlled switch is off, and the test switch is off. The external timing circuit can reliably provide the activation voltage, ensuring the normal operation of the pyrotechnic. At the same time, the off state of the controlled switch provides an additional safety barrier to prevent abnormal current interference. In the test state: the selector switch is on, the controlled switch is off, and the test switch is on. The system uses milliampere-level safe current for resistance measurement, achieving accurate detection of the pyrotechnic status while completely avoiding the risk of accidental activation during testing. This state configuration mechanism based on switch logic not only achieves a balance between absolutely reliable safety status, precise and controllable working status, and safe and convenient testing status, but also replaces complex electronic control logic with physical isolation, significantly reducing system failure rate and human operation risks. This enables pyrotechnic systems to meet the most stringent safety standards while maintaining necessary functional flexibility throughout their entire life cycle.

[0046] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0047] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0048] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0049] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0050] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0051] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0052] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A pyrotechnics control device internally controlled by an external timing control system, characterized in that, include: Control switch, used in parallel with pyrotechnic devices; The selector switch, which is connected in series with the control switch, forms an activation control circuit. An external timing circuit is used to connect with the activation control circuit to form a first loop; A resistance testing circuit, which is connected to the activation control circuit to form a second loop, the resistance testing circuit includes a test switch and a constant current source connected in series, and a voltage testing circuit connected in parallel across the constant current source. By controlling the conduction status of the selector switch, control switch, and test switch, the pyrotechnic device can be configured into a control, activation, or test state.

2. The pyrotechnics control device internally controlled by an external timing control device as described in claim 1, characterized in that, It also includes a controller, which is connected to the voltage testing circuit and is used to calculate the resistance value of the pyrotechnic device to be tested based on the voltage across the constant current source.

3. The pyrotechnics control device internally controlled by an external timing control device as described in claim 2, characterized in that, A test switch is connected in series at each end of the constant current source.

4. The pyrotechnics control device internally controlled by an external timing control device as described in claim 2, characterized in that, A current-limiting resistor is provided between the activation positive terminal of the external timing circuit and the activation control circuit.

5. The pyrotechnics control device internally controlled by an external timing control device as described in claim 1, characterized in that: When the device is in operation, the external timing circuit is connected to the activation control circuit to configure the pyrotechnic device to a controlled, activated, or tested state. When the equipment is in transport or storage, the external timing circuit is disconnected from the activation control circuit, and the pyrotechnic device is configured to a controlled state.

6. The pyrotechnics control device internally controlled by an external timing control device as described in claim 1, characterized in that: When the pyrotechnic device is configured to the controlled state, the control switch is turned on, the selector switch is turned off, the test switch is turned off, the pyrotechnic device is disconnected from the external timing circuit, and the pyrotechnic device will not be activated. When the pyrotechnic device is configured to be activated, the external timing circuit has an output, the selector switch is turned on, the control switch is turned off, the test switch is turned off, the external timing circuit supplies power to the pyrotechnic device, and the pyrotechnic device is activated. When the pyrotechnic device is configured for testing, the external timing circuit has no output, the control switch is open, the selection switch is on, and the test switch is on. The internal resistance of the pyrotechnic device is then detected by the resistance testing circuit.

7. A method for controlling pyrotechnic devices internally by an external timing control device, characterized in that, The method for controlling pyrotechnics includes the following steps: The pyrotechnic device is connected in parallel with the control switch, and the selector switch is connected in series with the control switch to form an activation control circuit. The activation control circuit is connected to an external timing circuit to form a first loop, and the activation control circuit is connected to a resistance test circuit to form a second loop. The resistance test circuit includes a test switch and a constant current source connected in series, and a voltage test circuit connected in parallel across the constant current source. By controlling the conduction status of the selector switch, control switch, and test switch, the pyrotechnic device can be configured into a control, activation, or test state.

8. The method for controlling pyrotechnic devices within an external timing control device as described in claim 7, characterized in that, The method for controlling pyrotechnics also includes the following steps: When the equipment is in operation, the external timing circuit is connected to the activation control circuit to configure the pyrotechnic device into a controlled, activated, or tested state. When the equipment is in transport or storage, the external timing circuit is disconnected from the activation control circuit, and the pyrotechnic device is configured to a controlled state.

9. The method for controlling pyrotechnic devices internally by an external timing control device as described in claim 8, characterized in that, An external timing circuit is connected to an activation control circuit to configure the pyrotechnic device into a controlled, activated, or tested state, including: When the pyrotechnic device is configured to the controlled state, the control switch is turned on, the selector switch is turned off, the test switch is turned off, the pyrotechnic device is disconnected from the external timing circuit, and the pyrotechnic device will not be activated. When the pyrotechnic device is configured to be activated, the external timing circuit has an output, the selector switch is turned on, the control switch is turned off, and the test switch is turned off. At this time, the external timing circuit supplies power to the pyrotechnic device, and the pyrotechnic device is activated. When the pyrotechnic device is configured for testing, the external timing circuit has no output, the control switch is open, the selection switch is on, and the test switch is on. The internal resistance of the pyrotechnic device is then detected by the resistance testing circuit.

10. The method for controlling pyrotechnic devices within an external timing control device as described in claim 9, characterized in that, The internal resistance of the pyrotechnic item is detected by the resistance testing circuit, including: The voltage across the constant current source is acquired using a voltage testing circuit; The controller calculates the resistance value of the corresponding pyrotechnic device under test based on the voltage across the constant current source collected by the voltage testing circuit.

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