A PBIT circuit for testing the connection status of multi-channel electric explosive tubes

Abstract

The invention discloses a PBIT circuit for testing the connection status of multiple electric squibs, comprising a connected detection control and reporting module and an interface output module; wherein an output end of the detection control and reporting module is respectively connected to the detection control end and the status reporting end; the interface output module comprises a plurality of groups of electric squib circuits connected in series, the electric squib circuit comprises an ignition relay and an electric squib connected in series, two normally open contacts are arranged on the ignition relay as input contacts and output contacts respectively, adjacent electric squib circuits are connected to the input contacts of the next electric squib circuit through the output contacts of the previous electric squib circuit, wherein the input contact of the first electric squib circuit is connected to the other output end of the detection control and reporting module, and the output contact of the last electric squib circuit is connected to an input end of the detection control and reporting module. The invention has the ability to test the connection status of all electric initiators of a rocket ejection seat, and can report the status through PBIT.

Description

Technical Field

[0001] The invention belongs to the field of aviation ejection lifesaving, and in particular relates to a PBIT circuit for testing the connection state of multi-channel electric squibs. Background Art

[0002] The rocket ejection seat is an important equipment to ensure the normal combat effectiveness of the pilot and the safety and life-saving of the pilot in the event that the aircraft cannot be saved. At present, the latest rocket ejection seat adopts adaptive program control to control the ignition of up to 20 ignition mechanisms, and these ignition mechanisms use voltage signals to stimulate and ignite the electric detonator, thereby driving the ignition mechanism to move and complete the ejection and life-saving control. Therefore, the reliable electrical connection of the electric squib is related to whether the rocket ejection seat actuation mechanism can complete the set program, and thus plays a vital role in the safety and life-saving ability of the rocket ejection seat.

[0003] Since the loading and dismantling of the rocket ejection seat is a very large workload and involves the safety of pyrotechnics, after the rocket ejection seat is loaded, the equipment cannot be used to perform in-situ testing of all the electric squibs (loaded).

[0004] The current measures are to use special equipment to detect the out-of-position of all the electric squibs before loading the rocket ejection seat to ensure that the electric squibs are normal; secondly, use other equipment to test the continuity and correctness of the cables used to connect the electric detonators on the seat; finally, after the seat is loaded, the electric squibs of each ignition mechanism are docked with the cable connector. After the docking is completed, ground personnel can only install the electric squibs in place by visual inspection, but cannot accurately judge whether the electrical connection between the electric squib and the connector is good (such as internal misalignment of the connector, shrinkage of the pins, etc.), thus affecting the ejection and life-saving function of the rocket ejection seat. Summary of the invention

[0005] The object of the present invention is to provide a PBIT circuit for testing the connection status of multiple electric detonators, which has the ability to test the connection status of all electric detonators of a rocket ejection seat and can report the status through PBIT, so that ground personnel can accurately judge whether the electric detonators have unreliable electrical connection through the reported status information when the rocket ejection seat is powered on for testing after loading. At the same time, the circuit has flexible expansion capabilities. When the electric detonator test is expanded, no additional test components and installation space will be added. At the same time, the detection is safe and reliable, and no false excitation of the electric detonators will be caused.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a PBIT circuit for testing the connection status of multiple electric squibs, comprising a detection control and reporting module and an interface output module connected to each other; wherein an output end of the detection control and reporting module is respectively connected to the detection control end and the status reporting end; the interface output module comprises a plurality of groups of electric squib circuits connected in series, the electric squib circuits at least comprising an ignition relay and an electric squib connected in series, two normally open contacts are arranged on the ignition relay as input contacts and output contacts respectively, adjacent electric squib circuits connected in series are connected to the input contacts of the next electric squib circuit via the output contacts of the previous electric squib circuit, wherein the input contact of the first electric squib circuit is connected to the other output end of the detection control and reporting module, and the output contact of the last electric squib circuit is connected to an input end of the detection control and reporting module.

[0007] The electric squib circuit specifically includes an ignition relay, an ignition power supply, a connector and an electric squib, wherein the ignition relay is provided with two normally open contacts and two normally closed contacts, the two normally closed contacts are connected by cables to form a closed loop, the connector and the electric squib are connected in series on the closed loop, and the ignition relay is provided with two interfaces to respectively connect the ignition power supply and the external power supply.

[0008] The detection control and reporting module includes a detection control relay, an optical coupler, a load, a state detection terminal, a DSP and a contact conversion circuit; wherein the detection control relay is provided with two normally closed contacts and two normally open contacts, the two normally closed contacts are connected to form a closed loop, and the two normally open contacts are respectively used as the output terminal and the input terminal of the detection control and reporting module, and are respectively connected to the input contact of the first electric squib circuit and the output contact of the last electric squib circuit; the detection control relay has a built-in coil, one end of the coil is externally connected to a power supply, and the other end is connected to a contact conversion circuit, which is used to control the contact conversion of the detection control relay; the input end of the contact conversion circuit is connected to the detection control terminal; the detection control relay is provided with two interfaces respectively connected to the negative pole of the optical coupler input terminal and the ground; the positive pole of the input terminal and the positive pole of the output terminal of the optical coupler are both connected to the load, the negative pole of the output terminal is grounded, and the positive pole of the output terminal of the optical coupler is connected to the input terminal of the state detection terminal; the output terminal of the state detection terminal is connected to the input terminal of the DSP; the output terminal of the DSP is respectively connected to the detection control terminal and the state reporting terminal.

[0009] The load is connected to an external power supply, and the external power supplies in the detection control and reporting modules are all 5V.

[0010] The number of electric squib circuits is set to 3 to 20 groups.

[0011] The number of electric squib circuits is set to 20 groups.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The present invention has the ability to test the connection status of all electric detonators of a rocket ejection seat, and can report the status through PBIT, so that ground personnel can accurately judge whether there is unreliable electrical connection of the electric detonator through the reported status information when the rocket ejection seat is powered on for testing after loading. At the same time, the present invention has flexible expansion capabilities. When the electric detonator test is expanded, no additional test components and installation space will be added. At the same time, the detection is safe and reliable, and no false excitation of the electric detonator will be caused. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of circuit connection of an embodiment of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0016] A PBIT circuit for testing the connection status of a multi-channel electric squib designed by the present invention comprises:

[0017] Detection control and reporting module and interface output module, circuit connection diagram see Figure 1 .

[0018] The detection control and reporting module mainly includes a DSP controller, pull-up resistors R1 and R2, an optocoupler, a detection control relay (two sets of normally open contacts and two sets of normally closed contacts), current limiting resistors R3 and R4, and a switch transistor Q1. The detection control terminal of the main controller is connected to the base current limiting resistor R3 of the transistor Q1, the state detection terminal is connected to the output terminal "+" of the optocoupler, and the state reporting terminal sends the connection status of the electric explosive tube through the I / O port or the SCI port; the input terminal "+" of the optocoupler is connected to the pull-up current limiting resistor R1, and the input terminal "-" is connected to the detection control relay. The base of the switch transistor Q1 is connected to the control I / O port of the DSP through R1, and the collector is connected to the coil of the detection control relay, which is used to control the contact conversion of the detection control relay.

[0019] The interface output module mainly includes an ignition relay (two sets of normally open contacts and two sets of normally closed contacts), an electric squib, and connectors and cables for connecting the electric squib. The output end of the ignition relay is connected to an external electric detonator through cables and connectors. The input end "+" of the first ignition relay is connected to the output end "+" of the detection control relay. The output end "-" of the first ignition relay is connected to the input end "+" of the second ignition relay, until the output end "-" of the nineteenth ignition relay is connected to the input end "+" of the twentieth ignition relay. In this way, all connected electric squibs are connected in series through the normally closed contacts of the ignition relay, and finally connected to the circuit of the detection control and reporting module through the output end "-" of the twentieth ignition relay and the input end "-" of the control relay.

[0020] If you want to add electric squib detection to the existing test circuit, you only need to connect the ignition relay connected to the corresponding electric squib in series to the interface output module. There is no need to add additional detection circuits, and the expansion is convenient and flexible.

[0021] The present invention has the ability to test the connection status of all electric detonators of a rocket ejection seat, and can report the status through PBIT, so that ground personnel can accurately judge whether there is unreliable electrical connection of the electric detonator through the reported status information when the rocket ejection seat is powered on for testing after loading. At the same time, the present invention has flexible expansion capabilities. When the electric detonator test is expanded, no additional test components and installation space will be added. At the same time, the detection is safe and reliable, and no false excitation of the electric detonator will be caused.

[0022] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A PBIT circuit for testing the connection status of multi-channel electric squibs, characterized in that: It comprises a detection control and reporting module and an interface output module which are connected to each other; wherein an output end of the detection control and reporting module is respectively connected to the detection control end and the status reporting end; the interface output module comprises a plurality of groups of electric squib circuits which are connected in series in sequence, wherein the electric squib circuit comprises at least an ignition relay and an electric squib which are connected in series in sequence, wherein two normally open contacts are provided on the ignition relay as input contacts and output contacts respectively, wherein adjacent electric squib circuits which are connected in series in sequence are connected to the input contacts of the next electric squib circuit via the output contacts of the previous electric squib circuit, wherein the input contacts of the first electric squib circuit are connected to the other output end of the detection control and reporting module, and the output contacts of the last electric squib circuit are connected to an input end of the detection control and reporting module; The detection control and reporting module includes a detection control relay, an optical coupler, a load, a state detection terminal, a DSP and a contact conversion circuit; wherein the detection control relay is provided with two normally closed contacts and two normally open contacts, the two normally closed contacts are connected to form a closed loop, and the two normally open contacts are respectively used as the output terminal and the input terminal of the detection control and reporting module, and are respectively connected to the input contact of the first electric squib circuit and the output contact of the last electric squib circuit; the detection control relay has a built-in coil, one end of the coil is externally connected to a power supply, and the other end is connected to a contact conversion circuit, which is used to control the contact conversion of the detection control relay; the input end of the contact conversion circuit is connected to the detection control terminal; the detection control relay is provided with two interfaces respectively connected to the negative pole of the optical coupler input terminal and the ground; the positive pole of the input terminal and the positive pole of the output terminal of the optical coupler are both connected to the load, the negative pole of the output terminal is grounded, and the positive pole of the output terminal of the optical coupler is connected to the input terminal of the state detection terminal; the output terminal of the state detection terminal is connected to the input terminal of the DSP; the output terminal of the DSP is respectively connected to the detection control terminal and the state reporting terminal.

2. A PBIT circuit for testing the connection status of multi-channel electric squibs according to claim 1, characterized in that: The electric squib circuit specifically includes an ignition relay, an ignition power supply, a connector and an electric squib, wherein the ignition relay is provided with two normally open contacts and two normally closed contacts, the two normally closed contacts are connected by cables to form a closed loop, the connector and the electric squib are connected in series on the closed loop, and the ignition relay is provided with two interfaces to respectively connect the ignition power supply and the external power supply.

3. A PBIT circuit for testing the connection status of multi-channel electric squibs according to claim 1, characterized in that: The load is connected to an external power supply, and the external power supplies in the detection control and reporting modules are all 5V.

4. A PBIT circuit for testing the connection status of multi-channel electric squibs according to claim 1, characterized in that: The number of electric squib circuits is set to 3 to 40 groups.

5. A PBIT circuit for testing the connection status of multi-channel electric squibs according to claim 4, characterized in that: The number of electric squib circuits is set to 20 groups.

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