Current-limiting resistor design method in multi-path thermal battery parallel ignition scheme

Abstract

The invention belongs to the technical field of missile-borne electrical design of a weapon system, particularly relates to a current-limiting resistor design method in a multipath thermal battery parallel ignition scheme, and provides a current-limiting resistor constraint formula based on the current size of an ignition channel and ground launch control loading capacity, so that reliable activation of parallel ignition of multipath thermal batteries is effectively ensured. The method comprises the following steps: firstly, proposing a current-limiting resistance constraint requirement 1 based on an ignition channel activation current size constraint; secondly, proposing a current-limiting resistance constraint requirement 2 based on a ground launch control loading capacity constraint; the invention provides a design method of a current-limiting resistor of a multi-path thermal battery parallel ignition scheme by combining a constraint requirement 1 and a constraint requirement 2. Meanwhile, the method is high in engineering practice generalization performance and can be widely applied to multi-path parallel ignition scheme design of other initiating explosive devices in the future.

Description

Technical Field

[0001] The invention belongs to the technical field of on-board electrical design of weapon systems, and particularly relates to a design method for current-limiting resistors in a multi-channel thermal battery parallel ignition scheme. Background Art

[0002] With the rapid development of intelligent weaponry, the demand for onboard power is increasing. Single-channel thermal battery power supply is no longer sufficient for weaponry, and distributed power distribution using multiple thermal batteries has become the preferred power supply for weaponry electrical design. However, while multiple thermal batteries meet overall performance requirements, they also face the risk of bridging wires during activation. To improve ignition reliability, current-limiting resistors are typically connected in series with the thermal battery ignition channels when designing parallel ignition schemes for multiple thermal batteries. The resistance of these resistors is a key factor in the design of parallel ignition schemes for multiple thermal batteries.

[0003] Currently, for weapon system ignition designs, since most systems utilize time-sharing ignition, the design of current-limiting resistors is primarily focused on ensuring that the current in the ignition channel matches the activation current of the ignition device. However, for simultaneous ignition of parallel pyrotechnic devices, the current-limiting resistor design must not only ensure that the current in the ignition channel matches the activation current, but also prevent current dropout during the ignition process from affecting the reliable activation of other ignition devices. Based on this operating condition, this method proposes a current-limiting resistor design method for a multi-channel thermal battery parallel ignition scheme. The current-limiting resistor designed based on this method can ensure the reliable activation of multiple thermal batteries. This design method can also be extended to the design of parallel ignition schemes for other pyrotechnic devices. Summary of the Invention

[0004] (1) Technical issues to be resolved

[0005] The technical problem to be solved by the present invention is: in order to solve the problem of reliable activation of each thermal battery in the parallel ignition scheme of multiple thermal batteries and avoid the problem of activation current pull-down caused by ignition bridge wire overlap, a current limiting resistor needs to be set on the ignition channel. The present invention provides a design method for the current limiting resistor in the parallel ignition scheme of multiple thermal batteries.

[0006] (2) Technical solution

[0007] To solve the above technical problems, the present invention provides a method for designing a current-limiting resistor in a multi-channel thermal battery parallel ignition solution, the method comprising:

[0008] Step 1: Determine the setting requirements of the ignition channel current limiting resistor;

[0009] Step 2: Determine the current limiting resistor setting requirements based on the ground control load capacity constraint;

[0010] Step 3: Design of current limiting resistors for the multi-channel thermal battery parallel ignition scheme.

[0011] wherein, in the step one, the setting requirement of the ignition channel current-limiting resistor is determined;

[0012] As shown in Figure 1 D1, D2┈D V represent the thermal batteries, a total of V thermal batteries are connected in parallel for ignition, R 点 is the ignition device resistance of the thermal battery electric detonator, and one current-limiting resistor R 限 is connected in series on the ignition channel of each thermal battery, U is the output voltage of the ground launch control power supply;

[0013] V thermal batteries are each connected in series with one current-limiting resistor R 限 , and the V ignition channels are connected in parallel, and the output voltage of the ground launch control power supply is output;

[0014] In order to reliably ignite and activate a certain thermal battery, it is necessary to ensure that the current on the ignition channel thereof is within the activation current range of the ignition device, i.e. between the minimum activation current I 小 and the maximum activation current I 大 , as shown in formula 1.

[0015]

[0016] wherein, in the step two, the setting requirement of the current-limiting resistor is determined based on the load capacity constraint of the ground launch control;

[0017] During the activation of the ignition device, the state of the bridge wire cannot be determined, and the phenomena of bridging and breaking may exist; considering the worst case, the bridge wire is completely bridged and its resistance is in an ideal state of 0Ω; considering the load capacity constraint of the ground launch control, in order to ensure that the ignition devices of other thermal batteries can be reliably activated, the current-limiting resistor should meet the requirement of formula 2, wherein n is the number of short-circuit ignition devices caused by bridging, m is the number of unactivated ignition devices, V is the number of thermal batteries, and I max is the maximum current output capacity of the ground launch control.

[0018]

[0019] n+m=v (3)

[0020] Considering the maximum deterioration condition, the bridge wires of the ignition devices of V-1 thermal batteries are bridged, i.e. n=V-1 and m=1, in order to ensure that the ignition devices of the remaining 1 thermal battery can be reliably ignited and activated, the current-limiting resistor should meet the requirement of formula 4.

[0021]

[0022] wherein, in the step three, the current-limiting resistor design of the multi-path thermal battery parallel ignition scheme;

[0023] The design of the current limiting resistor for the multi-channel thermal battery parallel ignition scheme should satisfy both the ignition channel requirement constraints of formula (1) and the ground control load capacity requirement constraints of formula (4).

[0024] The method is based on the ignition channel current size and the ground control load capacity condition limit, and designs the current limiting resistor size to meet the condition requirements.

[0025] The method can ensure that all thermal batteries can be reliably ignited and activated under the maximum bridge wire overlap deterioration condition.

[0026] The method has been applied in the development of a domestic short- to medium-range missile project. The designed current-limiting resistor ensures reliable parallel activation of multiple thermal batteries on the missile. This method has broad versatility and potential for widespread application in the future in the design of multi-channel parallel ignition schemes for other pyrotechnic devices, improving their ignition reliability.

[0027] Among them, the method proposes a current limiting resistor constraint formula based on the ignition channel current size and the ground control load capacity, which effectively ensures the reliable activation of the parallel ignition of multiple thermal batteries.

[0028] Among them, the method first proposes current limiting resistor constraint requirement 1 based on the activation current size constraint of the ignition channel; then proposes current limiting resistor constraint requirement 2 based on the ground control load capacity constraint; combining constraint requirements 1 and 2, a design method for current limiting resistors in a multi-channel thermal battery parallel ignition scheme is proposed.

[0029] The method has strong applicability in engineering practice and can be widely used in the design of multi-channel parallel ignition schemes of other pyrotechnic products in the future.

[0030] (3) Beneficial effects

[0031] Compared to existing technologies, the proposed method has been applied in the development of a domestic medium- and short-range missile project. The designed current-limiting resistor ensures reliable parallel activation of multiple thermal batteries on the missile. This method has broad versatility and potential for widespread application in the future in the design of multi-circuit parallel ignition schemes for other pyrotechnic devices, thereby improving their ignition reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a circuit diagram of multiple thermal batteries connected in parallel for ignition.

[0033] Figure 2a-2d This is the ignition condition diagram when the current limiting resistor is 4Ω.

[0034] Figure 2a This is the normal ignition condition diagram. Figure 2b This is a diagram of the ignition situation with short circuit 1.

[0035] Figure 2c This is a diagram of the 2-way short-circuit ignition situation. Figure 2d This is a diagram of the 3-way short-circuit ignition situation. DETAILED DESCRIPTION

[0036] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and examples.

[0037] To solve the above technical problems, the present invention provides a method for designing a current-limiting resistor in a multi-channel thermal battery parallel ignition solution, the method comprising:

[0038] Step 1: Determine the setting requirements of the ignition channel current limiting resistor;

[0039] Step 2: Determine the current limiting resistor setting requirements based on the ground control load capacity constraint;

[0040] Step 3: Design of current limiting resistors for the multi-channel thermal battery parallel ignition scheme.

[0041] Wherein, in said step 1, the setting requirements of the current limiting resistor of the ignition channel are determined;

[0042] like Figure 1 As shown, define D1, D2┈D V Represents a thermal battery. There are V thermal batteries connected in parallel and ignited. R 点 The ignition resistor of the thermal battery electric ignition device is connected in series with a current limiting resistor R 限 , U is the output voltage of the ground control power supply;

[0043] Each of the V thermal batteries is connected in series with a current limiting resistor R 限 After that, the V-way ignition channels are connected in parallel, and the ground control power supply outputs the voltage;

[0044] If a thermal battery is to be reliably ignited and activated, it should be ensured that the current on its ignition channel is within the activation current range of the ignition device, that is, the minimum activation current I 小 To the maximum activation current I 大 As shown in formula 1.

[0045]

[0046] Wherein, in said step 2, based on the load capacity constraint of the ground transmission control, the setting requirements of the current limiting resistor are determined;

[0047] During the activation of the ignition device, the state of its bridge wire is uncertain, and both overlap and disconnection may occur. Considering the worst case, the bridge wire is completely overlapped and its resistance is ideally 0Ω. Considering the load capacity constraint of the ground control, to ensure that the ignition devices of other thermal battery pyrotechnics can be reliably activated, their current limiting resistors should meet the requirements of formula 2, where n is the number of short-circuited ignition devices caused by overlap, m is the number of unactivated ignition devices, V is the number of thermal batteries, and I max It is the maximum current output capability of the ground control.

[0048]

[0049] n+m=v (3)

[0050] Considering the maximum deterioration condition, the ignition device bridge wires of V-1 thermal batteries are overlapped, that is, n=V-1, m=1. In order to ensure that the ignition device of the remaining thermal battery can be reliably ignited and activated, its current limiting resistor should meet the requirements of formula 4.

[0051]

[0052] Among them, in the step 3, the current limiting resistor design of the multi-channel thermal battery parallel ignition solution;

[0053] The design of the current limiting resistor for the multi-channel thermal battery parallel ignition scheme should satisfy both the ignition channel requirement constraints of formula (1) and the ground control load capacity requirement constraints of formula (4).

[0054] The method is based on the ignition channel current size and the ground control load capacity condition limit, and designs the current limiting resistor size to meet the condition requirements.

[0055] The method can ensure that all thermal batteries can be reliably ignited and activated under the maximum bridge wire overlap deterioration condition.

[0056] The method has been applied in the development of a domestic short- to medium-range missile project. The designed current-limiting resistor ensures reliable parallel activation of multiple thermal batteries on the missile. This method has broad versatility and potential for widespread application in the future in the design of multi-channel parallel ignition schemes for other pyrotechnic devices, improving their ignition reliability.

[0057] Among them, the method proposes a current limiting resistor constraint formula based on the ignition channel current size and the ground control load capacity, which effectively ensures the reliable activation of the parallel ignition of multiple thermal batteries.

[0058] Among them, the method first proposes current limiting resistor constraint requirement 1 based on the activation current size constraint of the ignition channel; then proposes current limiting resistor constraint requirement 2 based on the ground control load capacity constraint; combining constraint requirements 1 and 2, a design method for current limiting resistors in a multi-channel thermal battery parallel ignition scheme is proposed.

[0059] The method has strong applicability in engineering practice and can be widely used in the design of multi-channel parallel ignition schemes of other pyrotechnic products in the future.

[0060] Example 1

[0061] The present invention is further described below in conjunction with the accompanying drawings. In the multi-channel thermal battery parallel ignition scheme, four thermal batteries are connected in parallel. The thermal battery's pyrotechnic ignition device has a resistance of 1Ω, an activation current of 5A to 10A, and a ground control power supply of 28V with a maximum current carrying capacity of 30A.

[0062] Step 1: Setting the ignition channel current limiting resistor

[0063] Considering the activation current setting constraint of the ignition channel, the current limiting resistor should meet the requirements of formula (5).

[0064]

[0065] Then the current limiting resistor should satisfy the requirements of formula (6).

[0066] 1.8Ω<<R 限 ≤4.6Ω (6)

[0067] Step 2: Setting the current limiting resistor based on the ground control load capacity constraint

[0068] Considering the maximum deterioration condition, during the activation process of the ignition device of the thermal battery pyrotechnics, there are three ignition devices of the thermal battery pyrotechnics overlapped. To ensure that the last thermal battery can be reliably ignited and activated, its current limiting resistor should meet the requirements of formula (7).

[0069]

[0070] Then we can obtain:

[0071] R 限 >>3.53Ω (8)

[0072] Step 3: Design method of current limiting resistor for multi-channel thermal battery parallel ignition scheme

[0073] In the design of the current limiting resistor for the multi-channel thermal battery parallel ignition scheme, it should satisfy both the ignition channel requirement constraints of formula (6) and the ground control load capacity requirement constraints of formula (8). The current limiting resistor range is obtained as:

[0074] 3.5 3Ω << R 限 ≤ 4.6Ω (9)

[0075] In order to verify the correctness of the design method, the current limiting resistor is selected as 4Ω according to formula (9), and simulation verification is carried out by using circuit simulation software. Four working conditions are set: ① normal ignition working condition; ② ignition device bridge wire lap ignition working condition of 1 hot battery fire product; ③ ignition device bridge wire lap ignition working condition of 2 hot battery fire products; ④ ignition device bridge wire lap ignition working condition of 3 hot battery fire products. The ignition condition is shown in Figure 2a-2d Under the working condition of 3 hot battery fire products of ignition device bridge wire lap ignition, the current required by the ground launch control power supply is 26.6A, and the current range of the ignition channel under all working conditions is 5.6A-7A. It can be seen from the simulation result that the current limiting resistor proposed by the design method can guarantee the reliable activation of 4 hot batteries.

[0076] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A method for designing a current limiting resistor in a multi-channel thermal battery parallel ignition scheme, characterized in that: The method comprises: Step 1: Determine the setting requirements of the ignition channel current limiting resistor; Step 2: Determine the current limiting resistor setting requirements based on the ground control load capacity constraint; Step 3: Design of current limiting resistors for the multi-channel thermal battery parallel ignition scheme.

2. The method for designing current limiting resistors in a multi-channel thermal battery parallel ignition scheme according to claim 1, characterized in that: In the step 1, the setting requirements of the ignition channel current limiting resistor are determined; Define D1, D2┈D V Represents a thermal battery. There are V thermal batteries connected in parallel and ignited. R 点 The ignition resistor of the thermal battery electric ignition device is connected in series with a current limiting resistor R 限 , U is the output voltage of the ground control power supply; Each of the V thermal batteries is connected in series with a current limiting resistor R 限 After that, the V-way ignition channels are connected in parallel, and the ground control power supply outputs the voltage; If a thermal battery is to be reliably ignited and activated, it should be ensured that the current on its ignition channel is within the activation current range of the ignition device, that is, the minimum activation current I 小 To the maximum activation current I 大 Between, as shown in formula 1; 3. The method for designing current limiting resistors in a multi-channel thermal battery parallel ignition scheme according to claim 2, characterized in that: In the step 2, based on the load capacity constraint of the ground transmission control, the setting requirements of the current limiting resistor are determined; During the activation of the ignition device, the state of its bridge wire is uncertain, and both overlap and disconnection may occur. Considering the worst case, the bridge wire is completely overlapped and its resistance is ideally 0Ω. Considering the load capacity constraint of the ground control, to ensure that the ignition devices of other thermal battery pyrotechnics can be reliably activated, their current limiting resistors should meet the requirements of formula 2, where n is the number of short-circuited ignition devices caused by overlap, m is the number of unactivated ignition devices, V is the number of thermal batteries, and I max It is the maximum current output capability of the ground control. n+m=v (3) Considering the most deteriorated working condition, the ignition bridge wires of V-1 thermal batteries are connected, that is, n = V-1, m = 1. To ensure that the ignition of the remaining thermal battery can be reliably ignited and activated, its current limiting resistor should meet the requirements of formula 4; 4. The method for designing current limiting resistors in a multi-channel thermal battery parallel ignition scheme according to claim 3, characterized in that: In the step 3, the current limiting resistor design of the multi-channel thermal battery parallel ignition scheme; The design of the current limiting resistor for the multi-channel thermal battery parallel ignition scheme should satisfy both the ignition channel requirement constraints of formula (1) and the ground control load capacity requirement constraints of formula (4).

5. The method for designing current limiting resistors in a multi-channel thermal battery parallel ignition scheme according to claim 4, characterized in that: The method is based on the ignition channel current size and the ground control load capacity condition limit, and designs the current limiting resistor size to meet the condition requirements.

6. The method for designing current limiting resistors in a multi-channel thermal battery parallel ignition scheme according to claim 4, characterized in that: The method can ensure that all thermal batteries can be reliably ignited and activated under the maximum bridgewire overlap deterioration condition.

7. The method for designing current limiting resistors in a multi-channel thermal battery parallel ignition scheme according to claim 4, characterized in that: The method has been applied to the development of a domestic medium- and short-range missile project. The designed current-limiting resistor ensures the reliable parallel activation of multiple thermal batteries on the missile. The method has broad versatility and applicability. In the future, it can be widely used in the design of multi-channel parallel ignition schemes for other pyrotechnics, thereby improving the ignition reliability of pyrotechnics.

8. The method for designing current limiting resistors in a multi-channel thermal battery parallel ignition scheme as claimed in claim 4, characterized in that: The method proposes a current limiting resistor constraint formula based on the ignition channel current size and the ground control load capacity, which effectively ensures the reliable activation of parallel ignition of multiple thermal batteries.

9. The method for designing current limiting resistors in a multi-channel thermal battery parallel ignition scheme according to claim 4, characterized in that: The method first proposes constraint requirement 1 of the current-limiting resistor based on the activation current size constraint of the ignition channel; then proposes constraint requirement 2 of the current-limiting resistor based on the load capacity constraint of the ground control; and combining constraint requirements 1 and 2, a design method for the current-limiting resistor of the multi-channel thermal battery parallel ignition scheme is proposed.

10. The method for designing current limiting resistors in a multi-channel thermal battery parallel ignition scheme according to claim 4, characterized in that: The method has strong engineering practice applicability and can be widely used in the design of multi-channel parallel ignition schemes of other pyrotechnic products in the future.

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