Solid rocket engine ignition circuit capable of preventing transient false triggering of control end reset

Abstract

The application provides a solid rocket engine ignition circuit capable of preventing the control system control output end from being reset transiently and mis-triggered. The control end reset transient high level is prevented from being mis-triggered, and a simple logic module and a pull-up resistor are adopted to prevent the control system control output end from being reset transiently and mis-triggered. The pull-up resistor connected to the output end of the control module makes the control signal output by the control module in a high state during the reset period. The logic module is inverted to a low level signal, so that the high level signal output by the control module during the power-on reset period can be effectively prevented from directly causing the ignition module to be mis-triggered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety ignition circuit of solid rocket engine, in particular to a solid rocket engine ignition circuit capable of preventing transient false triggering of control end reset. BACKGROUND

[0002] The advantage of solid rocket engine in transportation and storage makes it widely used in various rocket projectiles, guided bombs, missiles and various individual weapons. The solid rocket engine belongs to explosive substances, and the ignition system is one of the most sensitive control components in the engine. It is particularly important to reduce the sensitivity of the ignition system and improve its safety under various adverse electromagnetic interferences such as static electricity source, lightning and radio frequency in the external natural environment. In order to meet the safety insurance and reliable ignition of weapon system and prevent accidental firing of the ignition circuit, on the one hand, the ignition circuit is required to ensure that the rated current pulse is provided to the firing element in the battle working state under various adverse environments; on the other hand, the ignition circuit is required to effectively prevent the misfire of the firing element under the interference or environmental influence in the non-battle state.

[0003] At present, the relay control ignition nozzle is mostly used in the design of the safety ignition circuit of the solid rocket engine. In the usual design circuit, the ignition control system sends an ignition command to control the action of the ignition relay to complete the ignition of the engine. In the power-on process and the configuration process of the control system, the output state of the control system is uncontrollable because the control system is in an indefinite state. The ignition signal output uses a high-voltage (such as +26V) power supply, which belongs to a primary power supply and is often in an effective state before the low-voltage (such as +5V) power supply used in the control circuit. In the reset configuration process of the control system, the ignition control signal is in an indefinite state, and if a transient high-level signal is sent, the ignition relay will be easily turned on, resulting in false output of the ignition signal. In order to ensure the safety of the pyrotechnics, the safety ignition circuit of the projectile must have a multi-level safety design. The existing safety ignition circuit generally uses the following ways to ensure the safety of the pyrotechnics:

[0004] Adopting a 1A1W / 5min non-ignition insensitive ignition device can prevent the misfire to a certain extent; adopting an RLC filter circuit allows the current of the required frequency to pass through and prevents the current of other frequencies; and a multi-level relay is used for safety protection through a control switch.

[0005] However, the current ignition circuit structure is relatively complex, and therefore, a new technical solution capable of preventing the transient false triggering of the control system control output end reset is required to solve the above problems. SUMMARY

[0006] Therefore, the present application provides a solid rocket engine ignition circuit capable of preventing the transient false triggering of the control system control output end reset.

[0007] To achieve the above object, the technical scheme of the present application is:

[0008] A solid rocket engine ignition circuit for preventing transient false triggering of control end reset, comprising a control module, a logic module, a driving module, a switch module and an ignition module;

[0009] The control module outputs a control signal to the logic module, and the output end of the control module is connected with a pull-up resistor, and the pull-up resistor is connected with a high-level control voltage; when ignition is needed, the control module outputs a low-level control signal to the logic module.

[0010] The logic module inversely outputs the control signal output by the control module to the driving module.

[0011] The driving module controls the opening and closing of the relay according to the control signal output by the logic module.

[0012] The input end of the switch module is connected with the driving module, and the output end of the switch module is connected with the ignition module; when the switch module is always open, the ignition circuit is disconnected, and the ignition module cannot be ignited; when the switch module is closed, a high-level signal is output to the ignition module, the ignition circuit is turned on, and ignition is performed.

[0013] The ignition module simultaneously receives an ignition voltage and a control signal sent by the switch module, and triggers ignition when the control signal meets the condition.

[0014] The logic module inversely outputs the control signal output by the control module to the driving module.

[0015] In the driving module, when the input is a high-level signal, the driving module drives the switch module to be closed, otherwise the switch module remains in the always open state.

[0016] The driving module adopts a Darlington driving tube.

[0017] The switch module adopts an always open relay, which is closed only when the Darlington tube outputs a high-level signal, and sends a control signal to the ignition module.

[0018] Advantages:

[0019] 1. The solid rocket engine safety ignition circuit of the present application can prevent transient false triggering of the control system control output end reset, and can effectively prevent the control module from directly causing false triggering of the ignition module by outputting a high-level signal during power reset.

[0020] 2、The safety ignition circuit of the present application is simple in design, compared with the commonly used multi-stage relay type safety ignition circuit, the circuit can effectively prevent the reset transient false triggering of the control system output end only by a pull-up resistor and a logic module, has low debugging difficulty coefficient and low production cost, and is high in efficiency and safety.

[0021] 3、In the present application, the input end of the logic module is connected with the control signal output by the control module, and the output end is connected with the driving module, when the control signal is a low level signal, the logic module inversely outputs a high level signal to the driving module, when the control signal is a high level signal, the logic module inversely outputs a low level signal to the driving module, so that the ignition module is prevented from being false triggered. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Fig. 1 is a schematic diagram of the ignition circuit principle of the present application.

[0023] Figure 2 Fig. 2 is a schematic diagram of the working process of the ignition circuit of the present application. DETAILED DESCRIPTION

[0024] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0025] The present application provides a solid rocket engine ignition circuit for preventing control end reset transient false triggering, as shown in Fig. 1, which comprises a control module, a logic module, a driving module, a switch module and an ignition module. Figure 1

[0026] The control module output end is connected with the logic module, and the control module output end is also connected with a pull-up resistor. In order to prevent the control module from sending a high level signal directly to cause the ignition module to be false triggered during the power reset moment, the ignition circuit is connected with a pull-up resistor at the control output end of the control module, so that the control signal output by the control module is in a high state during the reset period, and the high level signal is inversely converted into a low level signal by connecting the logic module at the control output end of the control module, so that the ignition module is prevented from being false triggered during the reset period of the control module. The pull-up resistor is connected with a high level control voltage, and when ignition is needed, the control module outputs a low level control signal to the logic module.

[0027] The logic module adopts a logic NOT gate, the input end of the logic module is connected with the control signal output by the control module, and the output end is connected with the driving module, so that the control signal output by the control module is inversely output to the driving module. Specifically, when the control signal is a low level signal, the logic module inversely outputs a high level signal to the driving module, when the control signal is a high level signal, the logic module inversely outputs a low level signal to the driving module, so that the ignition module is prevented from being false triggered.

[0028] ​The input end of the driving module is connected with the output end of the logic module, and the output end is connected with the switch module, and the opening and closing of the relay is controlled according to the control signal output by the logic module, specifically, when the input is a high level signal, the driving module drives the switch module to close, otherwise the switch module is kept in the open state; in the embodiment, the driving module adopts a Darlington driving tube.

[0029] The input end of the switch module is connected with the driving module, and the output end is connected with the ignition module, when the switch module is always open, the ignition circuit is disconnected, and the ignition module cannot ignite; when the switch module is closed, a high level signal is output to the ignition module, the ignition circuit is turned on, and ignition is performed. In the embodiment, the switch module adopts a normally open relay, which is closed only when the Darlington tube outputs a high level signal, and sends a control signal to the ignition module.

[0030] The ignition module receives the ignition voltage and the control signal sent by the switch module at the same time, and triggers ignition when the control signal meets the condition. The specific working process of the circuit of the application is shown in Figure 2

[0031] In summary, the above is only a preferred embodiment of the application, and is not used to limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application shall be included in the protection scope of the application.​

Claims

1. A solid rocket engine ignition circuit that prevents a master reset transient from falsely triggering, characterized by, It comprises a control module, a logic module, a drive module, a switch module and an ignition module. The control module outputs a control signal to the logic module, and the output end of the control module is connected with a pull-up resistor, and the pull-up resistor is connected with a high-level control voltage; when ignition is needed, the control module outputs a low-level control signal to the logic module. The logic module inversely outputs the control signal output by the control module to the drive module. The drive module controls the opening and closing of the relay according to the control signal output by the logic module. The input end of the switch module is connected with the drive module, and the output end of the switch module is connected with the ignition module; when the switch module is always open, the ignition circuit is disconnected, and the ignition module cannot ignite; when the switch module is closed, a high-level signal is output to the ignition module, the ignition circuit is turned on, and ignition is performed. The ignition module simultaneously receives an ignition voltage and a control signal output by the switch module, and triggers ignition when the control signal meets the condition.

2. The circuit of claim 1, wherein, The logic module adopts a logic NOT gate to inversely output the control signal output by the control module to the drive module.

3. The circuit of claim 1 or 2, wherein, In the drive module, when the input is a high-level signal, the drive module drives the switch module to be closed, otherwise the switch module is always open.

4. The circuit of claim 3, wherein, The drive module adopts a Darlington drive tube.

5. The circuit of claim 4, wherein, The switch module adopts a normally open relay, which is closed only when the Darlington tube outputs a high-level signal, and sends a control signal to the ignition module.

Images