Two-stage start control ignition circuit based on digital code stream control

Abstract

The invention discloses a two-stage starting control ignition circuit based on digital code stream control. The two-stage starting control ignition circuit is mainly applied to an ignition circuit use scene with a high ignition safety requirement in a guided aircraft system. According to the circuit, two-stage starting control signals are used for outputting ignition signals, a first-stage switch is controlled by digital code stream signals, a second-stage switch is controlled by digital IO high-low level signals, and the ignition signals can be output only when correct digital code stream signals are received and the second-stage switch is at a high level. The circuit can effectively prevent ignition error output caused by failure of the IO port of the control circuit, and the ignition safety of a guided aircraft system can be greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of guided aircraft, and in particular relates to a two-stage start-up control ignition circuit based on digital code stream control. Background Art

[0002] Guided aircraft systems are large and complex, and numerous pyrotechnic devices require ignition circuits for ignition control. Ignition safety design is paramount in aircraft safety. Currently, in the guided aircraft field, ignition control I / O signals are primarily output through control circuits. These signals, after optical coupling isolation, drive subsequent driver circuits, ultimately generating the ignition signal.

[0003] Guided aircraft control systems, power systems, and damage systems are complex, and aircraft safety requirements are extremely high. Currently, the ignition signal in guided aircraft is directly controlled by the IO level of the core control circuit. When the IO port fails, the IO state may reach a high level under unexpected circumstances or be interfered with and glitch during transmission. This may cause the ignition output to be incorrectly output during use, thereby causing a safety accident. Summary of the Invention

[0004] To overcome the shortcomings of the existing technology, the present invention provides a two-stage start-up control ignition circuit based on digital code stream control. This circuit is primarily used in guided aircraft systems where ignition circuits require high ignition safety. This circuit uses a two-stage start-up control signal to output the ignition signal. The first-stage switch is controlled by the digital code stream signal, while the second-stage switch is controlled by the high and low level signals of the digital IO. The ignition signal is output only when the correct digital code stream signal is received and the second-stage switch is at a high level. This circuit effectively prevents ignition errors caused by IO port failures in the control circuit, significantly improving ignition safety in guided aircraft systems.

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0006] A two-stage start-up control ignition circuit based on digital code stream control includes a control-side circuit, an isolation module, and a drive-side circuit; the control-side circuit includes a code recognition module and an AND operation module; the drive-side circuit includes a primary switch drive module and a secondary switch drive module; the isolation module isolates the control-side circuit from the drive-side circuit;

[0007] The input of the coding recognition module is a first-level switch digital code stream signal;

[0008] The AND operation module performs an AND operation on the output signal of the code recognition module and the secondary switch IO control signal, and outputs the AND operation result to the isolation module;

[0009] The isolation module receives the digital signals output from the coding recognition module and the AND operation module, and isolates them from the driving side circuit;

[0010] The primary switch driving module receives a primary switch isolation control signal; the primary switch isolation control signal is the result of the output signal of the coding recognition module passing through the isolation module. When the result is high, the primary switch isolation control signal is high, and the primary switch driving module is turned on; when the result is low, the primary switch isolation control signal is low, and the primary switch driving module is turned off;

[0011] The secondary switch driving module receives a secondary switch isolation control signal; the secondary switch isolation control signal is the result of the output of the AND operation module passing through the isolation module. When the output signal of the code recognition module is high and the secondary switch IO control signal is also high, the secondary switch isolation control signal is high and the secondary switch driving module is turned on; when either the output signal of the code recognition module or the secondary switch IO control signal is low, the secondary switch isolation control signal is low and the secondary switch driving module is turned off; at the same time, the secondary switch driving module does not respond to a high-level secondary switch isolation control signal with a pulse width of less than 10 microseconds;

[0012] The ignition circuit requires the control side circuit and the drive side circuit to be powered at the same time, and will output an ignition signal only when the primary switch drive module and the secondary switch drive module are turned on at the same time.

[0013] Preferably, the protocols supported by the digital code stream signal include IIC, SPI, and Uart.

[0014] Preferably, the coding recognition module pre-stores a set code stream signal and compares it with the input signal. Only when the input signal is consistent with the pre-stored code stream signal, the coding recognition module outputs a high level signal, otherwise it outputs a low level signal.

[0015] Preferably, the coding recognition module is capable of recognizing the response time configuration information in the digital code stream, and outputting a high-level signal after a delay according to the configured delay time after the comparison result is correct.

[0016] Preferably, the isolation method includes capacitive isolation, magnetic isolation, and optical isolation.

[0017] The beneficial effects of the present invention are as follows:

[0018] The present invention is used in ignition circuit usage scenarios in guided aircraft systems that require high ignition safety. It can effectively prevent ignition error output caused by failure of the control circuit IO port, and can greatly improve the ignition safety of the guided aircraft system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a circuit composition block diagram of the present invention;

[0020] Figure 2 Circuit diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] The present invention provides a two-stage start-up control ignition circuit based on code stream control, which can effectively prevent ignition error output caused by uncontrolled level when the IO port fails or is interfered, thereby improving the ignition safety of the guided aircraft weapon system.

[0023] The circuit composition of the present invention is as follows Figure 1 As shown, the circuit includes a code recognition module, an AND operation module, an isolation module, a primary switch driver module, and a secondary switch driver module. The code recognition module and the AND operation module belong to the control-side circuit, while the primary and secondary switch driver modules belong to the driver-side circuit. The isolation module isolates the control-side circuit from the driver-side circuit.

[0024] The coding recognition module can identify digital code stream signals including but not limited to IIC, SPI, Uart and other protocols. The module pre-stores the set code stream signal and compares it with the input signal. Only when the input signal is consistent with the pre-stored code stream signal, the coding recognition module outputs a high-level signal, otherwise it outputs a low-level signal. At the same time, the module can identify the response time configuration information in the digital code stream. After the comparison result is correct, it outputs a high-level signal after a delay according to the configured delay time.

[0025] The AND operation module performs an AND operation on the output signal of the code recognition module and the input IO control signal of the second-stage switch, and outputs the AND operation result to the isolation module.

[0026] The isolation module receives digital signals from the encoding recognition module and the AND operation module and isolates them from the drive side circuit. The isolation methods include but are not limited to capacitive isolation, magnetic isolation, optical isolation, etc.

[0027] The primary switch driving module receives the primary switch isolation control signal, which comes from the recognition result of the coding recognition module. When the recognition result is high, the primary switch isolation control signal is high and the primary switch driving module is turned on. When the recognition result is low, the primary switch isolation control signal is low and the primary switch driving module is turned off.

[0028] The secondary switch driver module receives a secondary switch isolation control signal, derived from the code recognition module's recognition result and the result of an AND operation between the secondary switch IO control signal. When both the code recognition module's recognition result and the secondary switch IO control signal are high, the secondary switch isolation control signal is high, turning the secondary switch driver module on. When either the code recognition module's recognition result or the secondary switch IO control signal is low, the secondary switch isolation control signal is low, turning the secondary switch driver module off. The module also disregards high-level secondary switch isolation control signals with a pulse width of less than 10 microseconds.

[0029] The ignition circuit requires the control side circuit and the drive side circuit to be powered at the same time, and will output an ignition signal only when the primary switch drive module and the secondary switch drive module are turned on at the same time.

[0030] Example:

[0031] This embodiment is applied to a missile-borne computer, and the internal structure of the circuit is as follows: Figure 2 shown.

[0032] This circuit uses an IIC logic code switch. The external control circuit is connected to the code recognition module via the clock and data lines of the IIC serial bus. The code recognition module has an external address configuration port. By pulling up, pulling down, or leaving it floating, the circuit's IIC address can be configured to 0x2F, 0x2C, or 0x2D. During operation, the code recognition module requires a 3V to 5V DC power supply (typically 3.3V). When the external control circuit's control command selects the current module and sends the correct channel open command, the code recognition module outputs a high-level signal; otherwise, it outputs a low-level signal.

[0033] An isolation chip is used in the circuit to isolate the output signal of the coding recognition module and the secondary switch control signal. The isolated output signal of the coding recognition module is used to drive the primary switch MOS, and the isolated secondary switch control signal is used to drive the secondary switch MOS.

[0034] The driving side circuit in the circuit uses two high-voltage NMOS devices using high-voltage BCD technology, with a maximum withstand voltage of up to 100V and a maximum current of 30A.

[0035] When the code recognition module recognizes the correct code stream, the primary switch MOS tube is turned on, and the voltage is added to the source of the secondary switch MOS tube after being output through the drain. When the primary switch MOS is turned on, the secondary switch control signal is high, and the secondary switch MOS tube is turned on. The current is output through the source of the secondary switch MOS tube and then flows through the current limiting resistor to reach the ignition device, igniting the ignition device to complete the ignition action.

Claims

1. A two-stage start-up control ignition circuit based on digital code stream control, characterized in that: It includes a control side circuit, an isolation module and a drive side circuit; the control side circuit includes a code recognition module and an AND operation module; the drive side circuit includes a primary switch drive module and a secondary switch drive module; the isolation module isolates the control side circuit from the drive side circuit; The input of the coding recognition module is a first-level switch digital code stream signal; The AND operation module performs an AND operation on the output signal of the code recognition module and the secondary switch IO control signal, and outputs the AND operation result to the isolation module; The isolation module receives the digital signals output from the coding recognition module and the AND operation module, and isolates them from the driving side circuit; The primary switch driving module receives a primary switch isolation control signal; the primary switch isolation control signal is the result of the output signal of the coding recognition module passing through the isolation module. When the result is high, the primary switch isolation control signal is high, and the primary switch driving module is turned on; when the result is low, the primary switch isolation control signal is low, and the primary switch driving module is turned off; The secondary switch driving module receives a secondary switch isolation control signal; the secondary switch isolation control signal is the result of the output of the AND operation module passing through the isolation module. When the output signal of the code recognition module is high and the secondary switch IO control signal is also high, the secondary switch isolation control signal is high and the secondary switch driving module is turned on; when either the output signal of the code recognition module or the secondary switch IO control signal is low, the secondary switch isolation control signal is low and the secondary switch driving module is turned off; at the same time, the secondary switch driving module does not respond to a high-level secondary switch isolation control signal with a pulse width of less than 10 microseconds; The ignition circuit requires the control side circuit and the drive side circuit to be powered at the same time, and will output an ignition signal only when the primary switch drive module and the secondary switch drive module are turned on at the same time.

2. A two-stage start-up control ignition circuit based on digital code stream control according to claim 1, characterized in that: The protocols supported by the digital code stream signal include IIC, SPI, and Uart.

3. The dual-stage start-up control ignition circuit based on digital code stream control according to claim 1, characterized in that: The coding recognition module pre-stores a set code stream signal and compares it with the input signal. Only when the input signal is consistent with the pre-stored code stream signal, the coding recognition module outputs a high-level signal, otherwise it outputs a low-level signal.

4. The dual-stage start-up control ignition circuit based on digital code stream control according to claim 1, characterized in that: The coding recognition module can recognize the response time configuration information in the digital code stream, and output a high-level signal after a delay according to the configured delay time after the comparison result is correct.

5. The dual-stage start-up control ignition circuit based on digital code stream control according to claim 1, characterized in that: The isolation methods include capacitive isolation, magnetic isolation, and optical isolation.

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