A two-stage start control ignition circuit based on digital code stream control

Abstract

The application discloses a two-stage starting control ignition circuit based on digital code flow control, which is mainly applied to the ignition circuit use scene with high ignition safety requirement in a guided aircraft system. The circuit uses two-stage starting control signals to realize the output of an ignition signal, wherein a first-stage switch is controlled by a digital code flow signal, and a second-stage switch is controlled by a digital IO high-low level signal. Only when the correct digital code flow signal is received and the second-stage switch is at a high level, the ignition signal can be output. The circuit can effectively prevent the ignition misoutput caused by the IO port failure of a control circuit, and can greatly improve the ignition safety of the guided aircraft system.

Description

Technical Field

[0001] This invention belongs to the field of guided aircraft technology, specifically relating to a two-stage ignition circuit based on digital code stream control. Background Technology

[0002] Guided aircraft systems are large and complex, requiring numerous pyrotechnic components to be controlled by ignition circuits. Ignition safety design is a crucial aspect of aircraft safety. Currently, in the field of guided aircraft, ignition control I / O signals are primarily output through control circuits. These I / O signals are then optocoupled and isolated before driving subsequent drive circuits, thereby outputting the ignition signal.

[0003] The control, power, and damage systems of guided aircraft are complex, and the safety requirements for aircraft are extremely high. Currently, the ignition signal of guided aircraft is directly controlled by the high and low levels of the I / O level of the core control circuit. When the I / O port fails, the I / O state may reach a high level unexpectedly or be interfered with during transmission, which may cause erroneous ignition output during use, thereby causing a safety accident. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a two-stage ignition control circuit based on digital code stream control, primarily applied in guided aircraft systems where ignition safety requirements are high. 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, and the second-stage switch is controlled by high / low level digital I / O signals. An ignition signal can only be output when a correct digital code stream signal is received and the second-stage switch is high. This circuit effectively prevents erroneous ignition output due to I / O port failure in the control circuit, significantly improving the ignition safety of guided aircraft systems.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows:

[0006] A two-stage ignition control 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 an encoding recognition module and an AND operation module; the drive-side circuit includes a first-stage switch drive module and a second-stage switch drive module; the isolation module isolates the control-side circuit from the drive-side circuit.

[0007] The input to the encoding and 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 encoding and recognition module and the secondary switch IO control signal, and outputs the AND operation result to the isolation module;

[0009] The isolation module receives digital signals from the encoding and recognition module and the AND operation module, and isolates them from the driving-side circuit.

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

[0011] The secondary switch driver module receives a secondary switch isolation control signal. This signal is the result of the AND operation module's output passing through the isolation module. When the output signal of the encoding and recognition module is high and the secondary switch I / O control signal is also high, the secondary switch isolation control signal is high, and the secondary switch driver module is turned on. When either the output signal of the encoding and recognition module or the secondary switch I / O control signal is low, the secondary switch isolation control signal is low, and the secondary switch driver module is turned off. Simultaneously, the secondary switch driver module does not respond to high-level secondary switch isolation control signals with a pulse width of less than 10 microseconds.

[0012] The ignition circuit requires power to both the control-side circuit and the drive-side circuit, and it will only output an ignition signal when both the primary switch drive module and the secondary switch drive module are turned on.

[0013] Preferably, the digital code stream signal supports protocols including IIC, SPI, and UART.

[0014] Preferably, the encoding and recognition module pre-stores a preset code stream signal and compares it with the input signal. The encoding and recognition module outputs a high-level signal only when the input signal matches the pre-stored code stream signal; otherwise, it outputs a low-level signal.

[0015] Preferably, the encoding and recognition module can identify the response time configuration information in the digital code stream, and after the comparison result is correct, output a high-level signal after a delay according to the configured delay time.

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

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

[0018] This invention is used in ignition circuits of guided aircraft systems where ignition safety requirements are high. It can effectively prevent ignition mis-output caused by the failure of the control circuit I / O port, and can significantly improve the ignition safety of guided aircraft systems. Attached Figure Description

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

[0020] Figure 2 Circuit diagram of an embodiment of the present invention. Detailed Implementation

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

[0022] This invention provides a two-stage ignition control circuit based on code stream control, which can effectively prevent erroneous ignition output caused by uncontrolled level of IO port when it is faulty or interfered with, thereby improving the ignition safety of guided aircraft weapon systems.

[0023] The circuit composition of the present invention is as follows Figure 1 As shown, the circuit includes an encoding and recognition module, an AND operation module, an isolation module, a first-level switch driver module, and a second-level switch driver module. The encoding and recognition module and the AND operation module belong to the control-side circuit, while the first-level switch driver module and the second-level switch driver module belong to the drive-side circuit. The isolation module separates the control-side circuit from the drive-side circuit.

[0024] The encoding and recognition module can recognize digital code stream signals of protocols including but not limited to IIC, SPI, and UART. The module pre-stores the preset code stream signals and compares them with the input signal. Only when the input signal matches the pre-stored code stream signal will the encoding and recognition module output a high-level signal; otherwise, it will output a low-level signal. At the same time, the module can recognize 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 encoding and 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 and recognition module and the AND operation module, and isolates them from the driving side circuit. The isolation methods include, but are not limited to, capacitive isolation, magnetic isolation, and optical isolation.

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

[0028] The secondary switch driver module receives a secondary switch isolation control signal, which originates from the recognition result of the encoding and recognition module and the result of the AND operation of the secondary switch I / O control signal. When both the recognition result of the encoding and recognition module and the secondary switch I / O control signal are high, the secondary switch isolation control signal is high, and the secondary switch driver module is turned on. When either the recognition result of the encoding and recognition module or the secondary switch I / O control signal is low, the secondary switch isolation control signal is low, and the secondary switch driver module is turned off. Simultaneously, this module can ignore high-level secondary switch isolation control signals with a pulse width of less than 10 microseconds.

[0029] The ignition circuit requires power to both the control-side circuit and the drive-side circuit, and it will only output an ignition signal when both the primary switch drive module and the secondary switch drive module are turned on.

[0030] Example:

[0031] This embodiment applies to an airborne computer, and its internal circuit structure is as follows: Figure 2 As shown.

[0032] This circuit employs an IIC logic encoding switch. The external control circuit and the encoding recognition module are connected via the clock and data lines of the IIC serial bus. The encoding recognition module has an address configuration port, which can be pulled up, pulled down, or left floating to configure the circuit's IIC address to 0x2F, 0x2C, or 0x2D. During use, a 3V to 5V DC power supply (typically 3.3V) is required for the encoding recognition module. When the external control circuit selects the current module and sends the correct channel enable command, the encoding 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 encoding and recognition module and the control signal of the secondary switch. The isolated output signal of the encoding and recognition module is used to drive the primary switch MOS, and the isolated control signal of the secondary switch is used to drive the secondary switch MOS.

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

[0035] When the encoding and recognition module recognizes the correct code stream, the first-stage switching MOSFET is turned on. After the voltage is output through the drain, it is applied to the source of the second-stage switching MOSFET. When the second-stage switching control signal is high while the first-stage switching MOSFET is turned on, the second-stage switching MOSFET is turned on. The current is output through the source of the second-stage switching MOSFET, flows through the current-limiting resistor to the ignition device, and ignites the ignition device to complete the ignition action.

Claims

1. A two-stage ignition control 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 an encoding and recognition module and an AND operation module; the drive-side circuit includes a first-level switch drive module and a second-level switch drive module; the isolation module isolates the control-side circuit from the drive-side circuit; The input to the encoding and 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 encoding and recognition module and the secondary switch IO control signal, and outputs the AND operation result to the isolation module; The isolation module receives digital signals from the encoding and recognition module and the AND operation module, and isolates them from the driving-side circuit. The first-level switch driving module receives the first-level switch isolation control signal; the first-level switch isolation control signal is the result of the output signal of the encoding and recognition module passing through the isolation module. When the result is high, the first-level switch isolation control signal is high and the first-level switch driving module is turned on; when the result is low, the first-level switch isolation control signal is low and the first-level switch driving module is turned off. The secondary switch driver module receives a secondary switch isolation control signal. This signal is the result of the AND operation module's output passing through the isolation module. When the output signal of the encoding and recognition module is high and the secondary switch I / O control signal is also high, the secondary switch isolation control signal is high, and the secondary switch driver module is turned on. When either the output signal of the encoding and recognition module or the secondary switch I / O control signal is low, the secondary switch isolation control signal is low, and the secondary switch driver module is turned off. Simultaneously, the secondary switch driver module does not respond to high-level secondary switch isolation control signals with a pulse width of less than 10 microseconds. The ignition circuit requires power to both the control-side circuit and the drive-side circuit, and it will only output an ignition signal when both the primary switch drive module and the secondary switch drive module are turned on.

2. The two-stage ignition control 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 two-stage ignition control circuit based on digital code stream control according to claim 1, characterized in that, The encoding and recognition module pre-stores a preset code stream signal and compares it with the input signal. The encoding and recognition module outputs a high-level signal only when the input signal matches the pre-stored code stream signal; otherwise, it outputs a low-level signal.

4. The two-stage ignition control circuit based on digital code stream control according to claim 1, characterized in that, The encoding recognition 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.

5. The two-stage ignition control 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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