LRM connector with hot plug and electromagnetic compatibility shielding functions

Abstract

The invention discloses an LRM connector with hot plugging and electromagnetic compatibility shielding functions, which relates to the technical field of computers and comprises a shielding structural member, a connector head, a connector seat and an electrical connecting member. Electromagnetic compatibility shielding is realized by selecting one stage or multiple stages in three-stage electromagnetic protection, and the three-stage electromagnetic protection comprises the steps that beryllium copper reeds are arranged at the joint of a connector head and a connector base to form the first-stage electromagnetic protection; shielding waterproof rubber is arranged between the connector seat end and the connector seat of the shielding structural member to form secondary electromagnetic protection; a labyrinth structure is arranged at the contact surface of the shielding structural member connector head end and the shielding structural member connector seat end to form three-stage electromagnetic protection; by designing the length of the pins of the LRM connector to be in contact in sequence and cooperating with a hot-plug circuit, the LRM connector capable of being hot-plugged quickly is realized. According to the invention, the reliable and effective electromagnetic shielding performance of the LRM connector can be realized, and the hot plugging function of the LRM connector is realized.

Description

Technical Field

[0001] The invention relates to the technical field of computers, in particular to an LRM connector with hot plug and electromagnetic compatibility shielding functions. Background Art

[0002] LRM is a modular design concept for electronic equipment that has been formed with the development of avionics systems. It is the hardware foundation of the fourth-generation avionics system and is of great significance to improving the combat readiness of military aircraft and reducing their life cycle costs. The new electronic system can adapt to various harsh environments and has the functions of flexible opening, rapid maintenance and high efficiency and versatility. It is replaceable on site, the installation structure function is relatively independent, and it has module-level fault diagnosis capabilities. Field replaceable modules (LRM) in modern avionics systems are becoming increasingly important. On-board electronic equipment must not only meet environmental adaptability requirements, but also be miniaturized, lightweight and standardized. As an important component of realizing electronic modularization, the LRM connector's related reinforcement functions must meet the environmental adaptability requirements and miniaturization, lightweight and standardization requirements of on-board electronic equipment. The existing LRM connectors have the following problems:

[0003] Existing LRM connectors do not take electromagnetic shielding measures and do not realize the electromagnetic compatibility shielding function. However, when used on equipment, they interact and interconnect with the equipment as blades, which will inevitably involve a large amount of high-speed signal transmission, and the electromagnetic compatibility shielding function is indispensable.

[0004] The existing technical solution only uses the hot-swap circuit to implement the blade interface design, and the hot-swap enable signal is set by the power input from the LRM connector. Figure 2 As shown. When the LRM blade is quickly hot-swapped, the blade power supply will not be powered off in advance and there is no protection function. The current LRM blade design for hot-swappable only uses a hot-swappable circuit of one power supply, and the hot-swappable enable is directly pulled up to the power input of the hot-swappable circuit. It does not take into account the probability of the blade being tilted during the fast hot-swappable process, resulting in uneven current distribution to each LRM connector pin and the order of powering on and off during the hot-swappable process. Within the allowable service life of the LRM connector, frequent hot-swappable may cause electric sparks and burn the pins black, and the surrounding insulation layer may be burned due to high temperature. The above reasons affect the service life of the LRM connector and fail to meet the standards for use in reinforced servers. Summary of the invention

[0005] The technical task of the present invention is to address the above deficiencies and provide an LRM connector with hot plug and electromagnetic compatibility shielding functions, which can achieve reliable and effective electromagnetic shielding performance of the LRM connector and realize the hot plug function of the LRM connector.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] An LRM connector with hot plug and electromagnetic compatibility shielding functions, comprising a shielding structure, a connector head, a connector seat and an electrical connector; electromagnetic compatibility shielding is achieved by selecting one or more levels among three levels of electromagnetic protection, wherein the three levels of electromagnetic protection include:

[0008] A beryllium copper spring is provided at the connection between the connector head and the connector seat to form a first-level electromagnetic protection;

[0009] A shielding waterproof rubber is arranged between the connector seat end of the shielding structure and the connector seat to form a secondary electromagnetic protection;

[0010] A labyrinth structure is arranged at the contact surface between the shielding structure connector head end and the shielding structure connector seat end to form a three-level electromagnetic protection;

[0011] By designing the LRM connector pins to contact in sequence according to length and combining it with a hot-swap circuit, a reliable, efficient, and fast hot-swappable LRM connector is achieved.

[0012] The LRM connector realizes electromagnetic compatibility shielding function, which is effectively realized through the three-level protection of integrated mold beryllium copper reed and maze structure, shielding waterproof rubber. At the same time, the LRM connector is designed to have long and short pins contact in sequence, and cooperates with hot plug circuit to realize hot plug function.

[0013] Furthermore, the first-level electromagnetic protection,

[0014] A groove is provided on the connector seat, and a beryllium copper reed is installed in the groove. The beryllium copper reed can maintain 25% compression deformation and remain unchanged within the 500 plug-in and unplug life of the LRM connector. It can have a shielding effectiveness of 110dB in magnetic field (100KHz), 100dB in electromagnetic (10MHz), and 90dB in plane wave (1GHz). It can maintain the electromagnetic shielding function when the connector head and the connector seat are plugged in place. Its function is not affected by harsh environment and is reliable and effective.

[0015] The contact surface between the connector seat and the connector head is provided with a connector waterproof rubber strip.

[0016] Furthermore, the secondary electromagnetic protection,

[0017] Shielding waterproof rubber is used to prevent the connector seat and the attached motherboard signal from leaking through the contact gap. Its electromagnetic shielding efficiency reaches 60dB and it also has waterproof function.

[0018] Furthermore, the shielding waterproof rubber is made of aluminum-silver die-cut rubber and has a compression and rebound function. It forms a good overlap with the shielding structural parts on both sides, which can effectively prevent the connector seat and the attached motherboard signal from leaking through the contact gap.

[0019] Furthermore, the three-level electromagnetic protection,

[0020] The maze structure is a double-type U-shaped structure, which can achieve high-frequency electromagnetic compatibility shielding of no less than 60dB. At the same time, a waterproof strip is installed in the inner groove to achieve internal waterproofing.

[0021] Furthermore, the waterproof rubber strip is made of rubber with a hardness of 40-60.

[0022] Furthermore, the LRM connector pins are in contact with each other in order of length.

[0023] The LRM connector is improved, and its pins are designed as long and short pins: the ordinary signal pin is designed as a short pin, the power pin is designed as a medium-long pin, and the power ground pin is designed as a long pin;

[0024] The three-level pins are contacted front and back in stages to ensure that when the LRM module is quickly hot-plugged, the power ground is pulled out last; when the LRM module is quickly plugged back in, the power ground is contacted first.

[0025] Furthermore, the lengths of the long needle, the medium-long needle, and the short needle differ by 1.5 mm respectively.

[0026] Furthermore, by combining the hot-swap circuit of the power supply with the signal interface of the LRM connector, the LRM module can be powered off in advance when the LRM module is unplugged, and the LRM module can be powered on slowly when the LRM module is inserted, thereby avoiding the occurrence of electric sparks.

[0027] Among them, the signal interface of the LRM connector is a short pin;

[0028] By using the grounding resistance from the short pin to the backplane, the CPLD system can be notified to shut down when the LRM blade is pulled out, avoiding system loss, damage and other problems caused by forced power off; when the LRM blade is inserted, the secondary pin is used to notify the CPLD system to power on, and the blade can be powered on immediately after insertion.

[0029] Furthermore, the hot-swap circuit of the power supply is matched with the signal interface of the LRM connector.

[0030] The LRM connector with long and short pin design improves the enable (EN) interface of the hot-swap circuit. The NPN-MOS tube is combined with the short pin of the LRM connector. When the LRM module is quickly plugged in and out, the control signal of the hot-swap circuit is connected to the backplane by the LRM short pin. In the first stage of unplugging, when the short pin is separated from the LRM connector pin on the backplane, the blade will be powered off immediately; when the long pin is pulled out, the long pin ground signal has not been pulled out, and the ground loop is retained, which can effectively avoid the occurrence of electric sparks or burning of the LRM connector;

[0031] When the LRM module is quickly inserted, the long-pin ground signal first contacts the backplane LRM connector pin to preserve the ground loop, then the medium-long-pin power contacts the backplane, and finally the control signal contacts the backplane to perform the power-on operation.

[0032] Compared with the prior art, the LRM connector with hot plug and electromagnetic compatibility shielding function of the present invention has the following beneficial effects:

[0033] The present invention realizes reliable and effective electromagnetic shielding performance of the LRM connector, and can effectively provide electromagnetic shielding in complex and harsh environments through three-level electromagnetic protection.

[0034] The present invention realizes the hot plug function of the LRM connector, adopts the design of the LRM connector pins of different lengths contacting in sequence, and cooperates with the hot plug circuit to realize a reliable and efficient fast hot plug function. When the LRM module is unplugged, the LRM module is powered off in advance, and when the LRM module is inserted, the power is slowly turned on, which can avoid the occurrence of electric sparks. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 1. It is a structural diagram of an LRM connector with hot plug and electromagnetic compatibility shielding functions provided by an embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of hot plugging of LRM computing blades in the prior art provided by the background technology of the present invention;

[0037] Figure 3 It is a schematic diagram of hardware design of a computing blade interface with an improved LRM connector that can be quickly plugged in and out provided by an embodiment of the present invention;

[0038] Figure 4 is a schematic diagram of the improved LRM connector pin design structure provided by an embodiment of the present invention;

[0039] Figure 5 is a flowchart of quickly removing an LRM module based on an improved hot-swap circuit provided by an embodiment of the present invention;

[0040] Figure 6It is a flowchart of the rapid insertion of the LRM module based on the improved hot-swap circuit provided by the embodiment.

[0041] In the figure, 1. connector head end of shielding structure component, 2. connector head, 3. connector waterproof rubber strip, 4. connector seat end of shielding structure component, 5. drainage groove, 6. waterproof rubber strip, 7. shielding waterproof rubber, 8. connector seat, 9. connector seat shielding structure shell, 10. beryllium copper reed, 11. groove, 12. maze structure. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0043] An embodiment of the present invention provides an LRM connector with hot plug and electromagnetic compatibility shielding functions. The design of the connector includes the design of an electromagnetic compatibility shielding function part and the design of a hot plug function part.

[0044] The electromagnetic compatibility shielding function is effectively achieved through the three-level protection of the integrated mold beryllium copper reed and the maze structure and the shielding waterproof rubber.

[0045] like Figure 1 As shown, its structure includes the following components: shielding structure connector head end 1, connector head 2, connector waterproof rubber strip 3, shielding structure connector seat end 4, drainage groove 5, waterproof rubber strip 6, shielding waterproof rubber 7, connector seat 8, connector seat shielding structure shell 9, beryllium copper reed 10, groove 11, labyrinth structure 12. The above components and electrical connectors together constitute the LRM connector.

[0046] Among them, the beryllium copper reed 10 and the groove 11 form a first-level protection, which is a ring structure, and can be installed in place and used reliably through customized tooling and molds. The beryllium copper reed 10 can maintain 25% compression deformation and remain unchanged within the 500 plug-in and unplug life of the LRM connector, and reliably maintain good overlap. The following is its electromagnetic shielding effectiveness: it can have 110dB shielding effectiveness in magnetic field (100KHz), 100dB shielding effectiveness in electromagnetic (10MHz), 90dB shielding effectiveness in plane wave (1GHz), and can maintain electromagnetic shielding function when the connector head 2 and the connector seat 8 are plugged in place. Its function is not affected by harsh environment and is reliable and effective. This is a first-level electromagnetic protection.

[0047] There is normally an installation gap between the LRM connector seat and the shielding structure. A shielding waterproof rubber 7 is designed between the connector seat end 4 of the shielding structure and the connector seat 8. The material of the rubber is aluminum-silver die-cut rubber, and it has a compression and rebound function, forming a good overlap with the two structures, which can effectively prevent the connector seat 8 and the attached motherboard signal from leaking through this contact gap. Its electromagnetic shielding efficiency can reach 60dB, and it also has a waterproof function. This is a secondary electromagnetic protection.

[0048] A labyrinth structure 12 is designed between the two shielding structural members. The labyrinth structure 12 is a double U-shaped structure. This structure can achieve high-frequency electromagnetic compatibility shielding of not less than 60dB. At the same time, a waterproof rubber strip 6 is installed in the internal groove. The material is rubber with a hardness of 40-60, which can achieve internal waterproofing. This is the third-level electromagnetic protection.

[0049] The above three levels of electromagnetic protection can effectively shield electromagnetic waves in complex and harsh environments. However, one or two levels can also be used at the same time to meet the electromagnetic compatibility shielding requirements.

[0050] The hot-swap function is achieved by designing the LRM connector pins to contact in sequence with different lengths, and cooperating with the hot-swap circuit to achieve a reliable and efficient LRM connector that can be quickly hot-swapped. It includes:

[0051] 1. Improve the LRM connector, design its pins as long and short pins, design the ordinary signal pins as short pins, design the power pins as medium and long pins, and design the power ground pins as long pins. The three-level pins are contacted back and forth in batches, so that when the LRM module is quickly hot-plugged, the power ground is pulled out last to ensure a good power return; and then when the LRM module is quickly plugged back in, the power ground is contacted first to ensure a good power return.

[0052] 2. Through the hot-swap circuit of the power supply and the signal interface (short pin) of the LRM connector, the LRM module can be powered off in advance when the LRM module is unplugged, and the power-on process is slowly performed when the LRM module is inserted to avoid the occurrence of electric sparks.

[0053] like Figure 3 As shown, it is a hardware design block diagram of the computing blade interface with an improved LRM connector that can be quickly plugged in and out.

[0054] By using the grounding resistance from the short pin to the backplane, the CPLD system can be notified to shut down when the blade is pulled out, avoiding system loss, damage and other problems caused by forced power off; when the blade is inserted, the secondary pin is used to notify the CPLD system to power on, and the blade can be powered on immediately when inserted.

[0055] The improved LRM connector can be quickly plugged in and out of the LRM module interface design method. On the one hand, the improved LRM connector design: the LRM connector signal interface uses a short pin design; the LRM power interface uses a medium-long pin design; the LRM connector ground interface uses a long pin design. On the other hand, the LRM connector combined with the long-short pin design improves the enable (EN) interface of the hot-swap circuit, and uses an NPN-MOS tube combined with the short pin of the LRM connector. When the LRM module is quickly plugged in and out, the control signal of the hot-swap circuit is connected to the backplane by the LRM short pin. In the first stage of unplugging, when the short pin is separated from the backplane LRM connector pin, the blade will be powered off immediately. When the medium-long pin is pulled out, the long pin has not been pulled out (ground signal), and the return ground is retained, which can effectively avoid the occurrence of electric sparks or burning of the LRM connector. Figure 5 When the LRM module is quickly inserted, the long pin ground signal first contacts the backplane LRM connector pin to keep a good ground loop, then the medium and long pin power contacts the backplane, and finally the control signal contacts the backplane to perform the power-on operation. Figure 6 shown.

[0056] Improve the LRM connector pin design such as Figure 4 As shown, the pin lengths of the LRM connector are designed to be three types: 2-long pin (ground signal), 1-medium-long pin (power signal), and 3-short pin (control / high-speed signal), and their lengths differ by 1.5 mm respectively; the enabling of the hot-swap circuit is optimized, and the short pin design of the LRM connector is combined to use the short pin to control the enabling of the hot-swap circuit to ensure that the power is turned off first when the blade is pulled out, and then turned on when the blade is inserted, thereby avoiding damage to the blade.

[0057] Through the above specific implementations, those skilled in the art can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific implementations. On the basis of the disclosed implementations, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions.

[0058] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

Claims

1. An LRM connector with hot plug and electromagnetic compatibility shielding functions, characterized in that: It includes a shielding structure, a connector head, a connector seat and an electrical connector; by selecting one or more levels in the three-level electromagnetic protection, electromagnetic compatibility shielding is achieved, and the three-level electromagnetic protection includes: A beryllium copper spring is provided at the connection between the connector head and the connector seat to form a first-level electromagnetic protection; A shielding waterproof rubber is arranged between the connector seat end of the shielding structure and the connector seat to form a secondary electromagnetic protection; A labyrinth structure is arranged at the contact surface between the shielding structure connector head end and the shielding structure connector seat end to form a three-level electromagnetic protection; By designing the LRM connector pins to contact in sequence of length and in conjunction with a hot-swap circuit, a fast hot-swappable LRM connector is achieved.

2. The LRM connector with hot-plug and electromagnetic compatibility shielding functions according to claim 1, characterized in that: The first level electromagnetic protection, A groove is provided on the connector seat, and a beryllium copper reed is installed in the groove. The beryllium copper reed can maintain 25% compression deformation and remain unchanged during the 500 plug-in and unplug life of the LRM connector. It can have a shielding effectiveness of 110dB in magnetic field, 100dB in electromagnetic field, and 90dB in plane wave. It can also maintain electromagnetic shielding function when the connector head and the connector seat are plugged in place. The contact surface between the connector seat and the connector head is provided with a connector waterproof rubber strip.

3. The LRM connector with hot plug and electromagnetic compatibility shielding function according to claim 1, characterized in that: The secondary electromagnetic protection, Shielding waterproof rubber is used to prevent the connector seat and the attached motherboard signal from leaking through the contact gap. Its electromagnetic shielding efficiency reaches 60dB and it also has waterproof function.

4. The LRM connector with hot plug and EMC shielding function according to claim 3, characterized in that: The shielding waterproof rubber is made of aluminum-silver die-cut rubber and has a compression and rebound function, and forms a good overlap with the shielding structural parts on both sides.

5. The LRM connector with hot plug and electromagnetic compatibility shielding function according to claim 1, characterized in that: The three-level electromagnetic protection, The maze structure is a double-type U-shaped structure, which can achieve high-frequency electromagnetic compatibility shielding of no less than 60dB. At the same time, a waterproof strip is installed in the inner groove to achieve internal waterproofing.

6. The LRM connector with hot plug and electromagnetic compatibility shielding function according to claim 5, characterized in that: The waterproof rubber strip is made of rubber with a hardness of 40-60.

7. The LRM connector with hot plug and electromagnetic compatibility shielding functions according to claim 1, characterized in that: The LRM connector pins are in contact with each other in order of length. The LRM connector is improved, and its pins are designed as long and short pins: the ordinary signal pin is designed as a short pin, the power pin is designed as a medium-long pin, and the power ground pin is designed as a long pin; The three-level pins are contacted front and back in stages to ensure that the power ground is pulled out last when the LRM module is quickly hot-plugged; when the LRM module is quickly plugged back in, the power ground is contacted first.

8. The LRM connector with hot plug and electromagnetic compatibility shielding functions according to claim 1, characterized in that: The lengths of the long needle, the medium-long needle and the short needle differ by 1.5 mm respectively.

9. The LRM connector with hot-plug and electromagnetic compatibility shielding functions according to claim 1, 7 or 8, characterized in that: The hot-swap circuit of the power supply is combined with the signal interface of the LRM connector to realize that when the LRM module is unplugged, the LRM module is powered off in advance, and when the LRM module is inserted, it is powered on slowly; Among them, the signal interface of the LRM connector is a short pin; By using the grounding resistance from the short pin to the backplane, the CPLD system is notified to shut down when the LRM blade is pulled out; when the LRM blade is inserted, the secondary pin is used to notify the CPLD system to power on, and the blade can be powered on immediately after insertion.

10. The LRM connector with hot plug and electromagnetic compatibility shielding functions according to claim 9, characterized in that: The hot-swap circuit of the power supply is matched with the signal interface of the LRM connector. The LRM connector with long and short pin design improves the enabling interface of the hot-swap circuit. The NPN-MOS tube is used in combination with the short pin of the LRM connector. When the LRM module is quickly plugged in and out, the control signal of the hot-swap circuit is connected to the backplane by the LRM short pin. In the first stage of unplugging, when the short pin is separated from the LRM connector pin on the backplane, the blade will be powered off immediately; when the middle long pin is pulled out, the long pin has not been pulled out yet, and the ground loop is retained, which can effectively avoid the occurrence of electric sparks or burning of the LRM connector. When the LRM module is quickly inserted, the long pin first contacts the backplane LRM connector pin to preserve the ground loop, then the middle and long pin power contacts the backplane, and finally the control signal contacts the backplane to perform the power-on operation.

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