Failure screening device and method suitable for miniature exploder

Abstract

The invention discloses a failure screening device and method suitable for a miniature exploder, and relates to the technical field of multi-path double-bridge electric detonator on-off detection.The failure screening device comprises electric detonator on-off detection equipment, and the electric detonator on-off detection equipment communicates with an upper computer through an RS232 communication protocol; the electric detonator on-off detection equipment needs to analyze the data sent by the upper computer and execute the corresponding test or function, and can store and return the test data after the detection is finished; the on-off detection circuit can detect the on-off condition of each path of the double-bridge electric detonator, has the functions of uploading data to the upper computer, storing the data and giving an alarm, has the characteristic of isolating interference, can isolate the electric detonator from the on-off detection circuit by using the isolation transformer, can reduce the influence of the circuit on the electric detonator, and improves the reliability of the electric detonator. Accidental detonation of the electric detonator in the detection process is effectively prevented; a detection signal can be correctly output, and the output power value of the device is within a safe range and does not reach the dangerous detonation condition of the electric detonator.

Description

Technical Field

[0001] The invention relates to the technical field of multi-channel double-bridge electric squib on-off detection, and in particular to a failure screening device and method suitable for micro initiators. Background Art

[0002] For the testing of universal aircraft seat equipment; squibs cannot be regarded as general electronic components, and multiple voltage tests and long-term continuous current tests are not allowed. The above operations will cause the squibs to fail, and the greater the voltage and current applied during the test, the higher the probability of failure. There is no specific energy analysis of the explosion impact of the squib, which poses a risk to test safety.

[0003] Therefore, in order to prevent the electric squib from being directly connected to the power supply, a transformer coupling method is used in the design to transfer energy to the electric squib, reduce the impact of the circuit on the electric squib, and effectively prevent the electric squib from accidentally detonating during the detection process. Summary of the invention

[0004] The object of the present invention is to provide a failure screening device and method suitable for micro-initiators to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a failure screening method suitable for a micro detonator, including an electric bursting tube on-off detection device, which communicates with a host computer using an RS232 communication protocol. The electric bursting tube on-off detection device needs to parse the data sent by the host computer and perform corresponding tests or functions. After the detection is completed, the test data can be stored and transmitted back, thereby realizing electrical isolation between master and slave devices and increasing the safety between devices.

[0006] Furthermore, the detection signal coupling and detection circuit design need to meet the electrical characteristics of the bridge wire of the electric detonator. If the power applied to the bridge circuit to be detected does not meet the requirements, the electric detonator cannot be turned on.

[0007] Furthermore, by utilizing the on-off status characteristics of the electric squib, the MCU's I / O is used to send a square wave signal of a specified frequency to the primary coil of the isolation transformer (1:1), which is then coupled to one end of the electric squib through the secondary coil. The other end of the electric squib is connected to the primary coil of another isolation transformer (1:1). The secondary of the coil is rectified by a diode and outputs high and low levels for detection by the MCU's I / O port.

[0008] Furthermore, the modulated square wave signal for detecting on / off needs to reach a frequency of 2KHZ, otherwise the transistor at the detection end cannot be turned on and the on / off state of the electric detonator cannot be determined.

[0009] Furthermore, the electric squib on-off detection device uses an isolation transformer to isolate the electric squib from the on-off detection circuit, which can reduce the impact of the circuit on the electric squib and effectively prevent the electric squib from accidentally detonating during the detection process.

[0010] Furthermore, a current-limiting resistor is connected in series with the coupling part of the circuit as a protection circuit. During on-off detection, the current is no more than 10mA, which is far below the detonation current condition of 500mA for the double-bridge squib, effectively preventing the coupling power from being too large to detonate the squib.

[0011] Furthermore, applying 24V~28V, 28uF, capacitor discharge action to each bridge circuit can reliably ignite within 1ms.

[0012] Furthermore, when a minimum direct current of 1A and a relative power of 1W is applied to each bridge circuit, no ignition occurs within 5 minutes.

[0013] Furthermore, the electric bursting tube on-off detection equipment is powered by an external battery. When the equipment is working, the upper computer controls the cutting off and opening of the power supply, so no additional switch button is required, effectively realizing the battery charging and discharging management and battery protection.

[0014] A failure screening device suitable for a micro-exploder, wherein the failure screening device adopts the above-mentioned failure screening method for a micro-exploder.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the electric bursting tube on-off detection equipment adopts RS232 communication protocol to communicate with the host computer, can receive the host computer command and start to perform on-off detection on the electric bursting tubes one by one, and uses transformer coupling to transfer energy to the electric bursting tubes. After the detection is completed, the test data can be stored and transmitted back; the test result can correctly output the detection signal, and the output power value of the equipment is within the safe range, which is far from reaching the dangerous detonation conditions of the electric bursting tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a block diagram of the overall architecture of the present invention.

[0017] Figure 2 It is a software flow chart.

[0018] Figure 3 This is the working principle diagram of the isolation transformer.

[0019] Figure 4 It is the schematic diagram of the on-off detection equipment of the electric detonator. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 4 The present invention provides a technical solution: a failure screening method suitable for a micro-initiator, including an electric bursting tube on-off detection device, the electric bursting tube on-off detection device uses the RS232 communication protocol to communicate with a host computer, the electric bursting tube on-off detection device needs to parse the data sent by the host computer and perform corresponding tests or functions, and after the detection is completed, it can store and return the test data, thereby realizing electrical isolation between master and slave devices and increasing the safety between devices.

[0022] Among them, the detection signal coupling and detection circuit design need to meet the electrical characteristics requirements of the electric detonator bridge wire. If the power applied to the bridge circuit to be tested does not meet the requirements, the electric detonator cannot be turned on.

[0023] Among them, the on-off state characteristics of the electric squib are utilized, and the MCU's I / O is used to send a square wave signal of a specified frequency to the primary coil of the isolation transformer (1:1), and then coupled to one end of the electric squib through the secondary coil. The other end of the electric squib is connected to the primary coil of another isolation transformer (1:1). The secondary of the coil outputs high and low levels after being rectified by a diode, allowing the MCU's I / O port to detect.

[0024] Among them, the modulated square wave signal for detecting on and off needs to reach a frequency of 2KHZ, otherwise the transistor at the detection end cannot be turned on and the on and off state of the electric detonator cannot be determined.

[0025] Among them, the electric squib on-off detection equipment uses an isolation transformer to isolate the electric squib from the on-off detection circuit, which can reduce the impact of the circuit on the electric squib and effectively prevent the electric squib from accidentally detonating during the detection process.

[0026] Among them, the circuit coupling part is connected in series with a current-limiting resistor as a protection circuit. The current is no more than 10mA during on-off detection, which is far below the 500mA detonation current condition of the double-bridge electric squib, effectively preventing the coupling power from being too large to detonate the electric squib.

[0027] Among them, 24V~28V, 28uF, capacitor discharge effect is applied to each bridge circuit, and it can ignite reliably within 1ms.

[0028] When a minimum direct current of 1A and a relative power of 1W is applied to each bridge circuit, no ignition will occur within 5 minutes.

[0029] Among them, the electric bursting tube on-off detection equipment is powered by an external battery. When the equipment is working, the upper computer controls the cutting off and opening of the power supply, so there is no need for additional switch buttons, which effectively realizes the battery charging and discharging management and battery protection.

[0030] A failure screening device suitable for a micro-exploder, wherein the failure screening device adopts the above-mentioned failure screening method for a micro-exploder.

[0031] Working principle: The on-off detection device of the electric initiator controls the power supply to be cut off and on through the host computer; when the lithium battery is powered off, the product does not work; during the online test, the lithium battery first powers on the device, the device self-checks and stands by, and then receives the host computer command, performs on-off test according to the command, returns historical test records or queries the device status, etc. After the on-off detection of the electric initiator is completed, the test data will be stored in the external FLASH; RS232 communication is adopted between the electric detonator on-off detection equipment and the host computer, including receiving, analyzing, processing downlink commands, and returning corresponding uplink commands. The communication protocol adopts the synchronization header + data length + data + checksum protocol format to ensure that each packet of data in the response is reliable; The MCU receives and parses the host computer command to perform tests or send back historical test results. The MCU outputs periodic high and low levels through the I / O port to obtain a 2KHz square wave signal, thereby controlling the on and off of the NMOS tube. When the electric squib is working normally, the NMOS tube is always in the on state. The MCU detects that the signal output I / O port is low level. If the electric squib is abnormal, the signal output is high level. The MCU modulated square wave signal is coupled to the current limiting resistor (≯10mA) through the first audio transformer (1:1) to prevent the coupling power from being too large and detonating the electric squib; the signal is transmitted to the current limiting resistor and then to the electric squib, and then the signal is coupled to the last coil through the second audio transformer (1:1); in the last coil, the diode is rectified to ensure that the current is forward-conducting; when the current is in the forward direction, the diode is turned on, the capacitor is charged, and the NMOS tube detects a high level; conversely, when the diode is cut off, since the capacitor acts as energy storage, the capacitor is discharged, and the current direction is from the capacitor to the resistor, so that the gate of the NMOS tube is still at a high level; thus, the working state of the electric squib can be obtained through the conduction state of the NMOS tube.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A failure screening method applicable to a micro-exploder, characterized in that: It includes electric bursting tube on-off detection equipment, which uses RS232 communication protocol to communicate with the host computer. The electric bursting tube on-off detection equipment needs to parse the data sent by the host computer and perform corresponding tests or functions. After the detection is completed, it can store and return the test data to achieve electrical isolation between the master and slave devices.

2. The failure screening method for micro-initiators according to claim 1, characterized in that: The detection signal coupling and detection circuit design need to meet the electrical characteristics requirements of the electric detonator bridge wire. If the power applied to the bridge circuit to be detected does not meet the requirements, the electric detonator cannot be turned on.

3. The failure screening method for micro-initiators according to claim 2, characterized in that: Taking advantage of the on-off status characteristics of the electric squib, the MCU's I / O is used to send a square wave signal of a specified frequency to the primary coil of the isolation transformer (1:1), which is then coupled to one end of the electric squib through the secondary coil. The other end of the electric squib is connected to the primary coil of another isolation transformer (1:1). The secondary of the coil is rectified by a diode and outputs high and low levels for detection by the MCU's I / O port.

4. The failure screening method for micro-initiators according to claim 3 is characterized in that: The modulated square wave signal for detecting on and off needs to reach a frequency of 2KHZ, otherwise the transistor at the detection end cannot be turned on and the on and off state of the electric detonator cannot be determined.

5. The failure screening method for micro-initiators according to claim 4, characterized in that: The electric squib on-off detection equipment uses an isolation transformer to isolate the electric squib from the on-off detection circuit.

6. The failure screening method for micro-initiators according to claim 5, characterized in that: The circuit coupling part is connected in series with a current-limiting resistor as a protection circuit, and the current is no more than 10mA during on-off detection.

7. The failure screening method for micro-initiators according to claim 6, characterized in that: Apply 24V~28V, 28uF, capacitor discharge action to each bridge circuit, and it can ignite reliably within 1ms.

8. The failure screening method for micro-initiators according to claim 7, characterized in that: When a minimum DC current of 1A and a relative power of 1W is applied to each bridge circuit, no ignition will occur within 5 minutes.

9. The failure screening method for micro-initiators according to claim 8, characterized in that: The electric bursting tube on-off detection equipment is powered by an external battery. When the equipment is working, the host computer controls the power cut-off and on-off, so no additional switch button is required.

10. A failure screening device suitable for a micro-exploder, characterized in that: The failure screening device adopts the failure screening method for micro-initiators as described in any one of claims 1 to 9.

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