Connector optical cable assembly resistant to high temperature in short time

Abstract

The short-time high-temperature-resistant connector optical cable assembly comprises a printed board assembly, the printed board assembly comprises a first rigid printed board and two second rigid printed boards arranged side by side, and the second rigid printed boards and the first rigid printed board are electrically connected through flexible printed boards; energy storage cover plates are arranged at the top and the bottom of the shell, a molybdenum copper block is installed on the second rigid printed board in an embedded mode, one side of the molybdenum copper block is flush with the inner side of the second rigid printed board, a photoelectric / electro-optical conversion chip is installed on the side of the molybdenum copper block in a surface-mounted mode, and the other side of the molybdenum copper block protrudes out of the outer side of the second rigid printed board and is in lap joint with the energy storage cover plates through heat conduction pads; the outer side of the shell is sleeved with a heat insulation sheath, and the inner wall of the heat insulation sheath abuts against the outer wall of the energy storage cover plate after assembly. According to the invention, electrical interconnection of double-backup high-density contact elements can be realized, and short-time high temperature resistance of the active electric connector optical cable assembly can be ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical communications, and in particular relates to a connector optical cable assembly capable of resisting high temperatures for a short period of time. Background Art

[0002] Active electrical connector cable assemblies typically integrate optoelectronic / electro-optical conversion modules within traditional electrical connectors and transmit signals via optical cables. These assemblies offer the reliability of electrical connectors, eliminating the risk of end-face contamination during insertion and removal, while retaining the advantages of optical fiber transmission, such as high bandwidth, low loss, lightweight, and electromagnetic interference resistance. Furthermore, they eliminate the need for separate optoelectronic / electro-optical conversion circuits within the connected devices. Consequently, they are widely used in aerospace, missile-borne, airborne, shipborne, ground vehicle-mounted, and missile-borne communications equipment.

[0003] When active electrical connector cable assemblies are used in missile-borne environments, they are subject to extremely harsh temperature conditions. During missile launch, the ambient temperature of active electrical connector cable assemblies will rise rapidly in a short period of time. Figure 1 Figure 2 shows the ambient temperature variation curve of the active electrical connector cable assembly during missile launch. At 4000s, the ambient temperature reaches a maximum of 160°C. Optical chips are very sensitive to temperature during operation. When the chip junction temperature exceeds 120°C, the chip may fail.

[0004] Therefore, in the prior art, active electrical connector cable assemblies have the following design difficulties:

[0005] 1. Since missile launches belong to the military field, military products require optoelectronic conversion products to have dual backup functions, and it is necessary to electrically interconnect the high-density distributed pin contacts with the optoelectronic / electro-optical conversion module;

[0006] 2. The ambient temperature during the missile launch process is high, reaching a maximum of 160°C. During this period of missile launch, it is necessary to ensure that the active electrical connector cable assembly can still work normally. Summary of the Invention

[0007] The present invention aims to solve the problems in the prior art and proposes the following technical solutions:

[0008] A short-term high-temperature-resistant connector cable assembly includes a plug, a housing mounted at the rear end of the plug, and a printed circuit board assembly disposed within the housing. The printed circuit board assembly includes a first rigid printed circuit board and two second rigid printed circuit boards disposed side by side, and the second rigid printed circuit boards are electrically interconnected with the first rigid printed circuit board via a flexible printed circuit board; the two second rigid printed circuit boards serve as backup for each other and are independently powered.

[0009] The top and bottom of the housing are both provided with an energy storage cover plate, a molybdenum copper block is embedded in the second rigid printed circuit board, one side of the molybdenum copper block is flush with the inner side of the second rigid printed circuit board and a photoelectric / electro-optical conversion chip is surface mounted, and the other side of the molybdenum copper block protrudes from the outer side of the second rigid printed circuit board and is overlapped with the energy storage cover plate through a thermal pad;

[0010] The outer side of the shell is covered with a heat-insulating sheath, and after assembly, the inner wall of the heat-insulating sheath and the outer wall of the energy storage cover plate are in contact with each other.

[0011] As a preferred embodiment of the above technical solution, a first conductive sealing ring is provided at the contact interface between the shell and the energy storage cover.

[0012] As a preferred embodiment of the above technical solution, the connector cable assembly further includes an MT jumper and an MT pressure plate. After the MT jumper is coupled with the optoelectronic / electro-optical conversion chip, a first MT connector is led out through a bare optical fiber, and the first MT connector is fixed in the corresponding slot of the housing by the MT pressure plate and screws.

[0013] As a preferred embodiment of the above technical solution, the energy storage cover plate includes a cover plate, which is a hollow structure and the inner cavity is filled with PCM material.

[0014] As a preferred embodiment of the above technical solution, the connector optical cable assembly further includes an optical cable assembly, the optical cable assembly includes a second MT connector at the head end, and the second MT connector is connected to the first MT connector.

[0015] As a preferred embodiment of the above technical solution, the optical cable assembly further comprises a side cover plate docked with the housing, a spring is provided between the side cover plate and the second MT connector, and an optical cable is provided at the tail end of the side cover plate.

[0016] The beneficial effects of the present invention are:

[0017] 1. The optoelectronic / electrooptical conversion module is implemented using a rigid-flexible printed circuit board assembly solution, consisting of three rigid printed circuit boards and two flexible printed circuit boards. The first rigid printed circuit board can be directly soldered to the pins leading out of the plug. The two second rigid printed circuit boards use the same design and are equipped with optoelectronic / electrooptical conversion circuits. They can be bent 90° for installation during assembly. The optoelectronic / electrooptical conversion circuits on the two second rigid printed circuit boards are independently powered and work as backup for each other.

[0018] 2. Since the photoelectric / electro-optical conversion chip is the main heat source when the active electrical connector cable assembly is working, the printed circuit board assembly adopts the method of partially embedding molybdenum copper blocks for heat dissipation; the molybdenum copper block itself has good thermal conductivity and is overlapped with the energy storage cover through a thermal pad, so that the heat generated by the photoelectric / electro-optical conversion chip when working is quickly conducted to the upper and lower energy storage covers for heat dissipation. As the ambient temperature gradually increases over time, the heat generated by the early optical chip when working will be absorbed and stored by the solid PCM material, thereby achieving the cooling of the internal photoelectric / electro-optical conversion chip. At the same time, the external thermal insulation sleeve can delay the impact of the external temperature on the active optical cable assembly. With this heat dissipation + heat resistance structure, the active electrical connector cable assembly can achieve the function of high temperature resistance for a short time. The thermal simulation results are as follows Figure 2 As shown in FIG. 4 , at 4000 s, the junction temperature of the optical chip can be kept at about 100°C, thereby ensuring that the active electrical connector and optical cable assembly can still work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure shows the temperature change of the active electrical connector cable during missile launch.

[0020] Figure 2 Shown is a thermal simulation temperature distribution cloud diagram of a short-time high-temperature-resistant connector cable assembly during the transmission process in an embodiment;

[0021] Figure 3 Shown is an exploded view of a short-term high-temperature-resistant connector cable assembly according to an embodiment;

[0022] Figure 4 The figure shows a schematic diagram of the three-dimensional structure of a plug in a short-time high-temperature-resistant connector cable assembly according to an embodiment;

[0023] Figure 5 The figure shows a three-dimensional structural diagram of a printed circuit board assembly in a short-time high-temperature-resistant connector optical cable assembly according to an embodiment;

[0024] Figure 6 The figure shows a cross-sectional view of the internal structure of an energy storage cover plate in a short-time high-temperature-resistant connector cable assembly according to an embodiment;

[0025] Figure 7 Shown is a schematic diagram of the three-dimensional structure of an optical cable assembly in a connector optical cable assembly with short-term high temperature resistance in an embodiment.

[0026] In the figure: 1. Plug; 2. Printed circuit board assembly; 3. Housing; 4. First conductive sealing ring; 5. Energy storage cover; 6. MT jumper; 7. MT pressure plate; 8. Second conductive sealing ring; 9. Optical cable assembly; 10. Thermal insulation jacket; 11. Connector housing; 21. First rigid printed circuit board; 22. Flexible printed circuit board; 23. Second rigid printed circuit board; 24. Molybdenum copper block; 25. Chip protection cover; 26. Photoelectric / electro-optical conversion chip; 51. Cover; 52. PCM material; 61. FA assembly; 62. First MT connector; 91. Second MT connector; 92. Spring; 93. Side cover; 94. Optical cable. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0028] Example

[0029] Figure 3 This is an exploded view of the structure of the rectangular active electrical connector cable assembly of the present invention. The assembly consists of a plug 1, a printed circuit board assembly 2, a housing 3, a first conductive seal 4, an energy storage cover 5, an MT jumper 6, an MT pressure plate 7, a second conductive seal 8, an optical cable assembly 9, and a thermal insulation sheath 10. The printed circuit board assembly 2 includes three sub-boards, which are connected together using a rigid-flexible printed circuit board. The first rigid printed circuit board 21, the middle sub-board of the printed circuit board assembly 2, is welded to the plug 1. The other two rigid printed circuit boards 23 are bent 90 degrees through the flexible printed circuit board 22 and fixed to the corresponding screw bosses of the housing 3 by screws. After the MT jumper 6 is coupled to the optoelectronic / electro-optical conversion chip 26 on the printed circuit board assembly 2, two 4mm first MT connectors 62 are introduced via bare optical fiber. These two 4mm first MT connectors 62 are then secured to the corresponding slots in the housing 3 using an MT pressure plate 7 and screws. The two 4mm second MT connectors 91 of the optical cable assembly 9 are inserted through the housing 3 and docked with the two 4mm first MT connectors 62 of the MT jumper 6. The interface between the structural components of the optical cable assembly 9 and the housing 3 is sealed by a second conductive sealing ring 8. The 4mm second MT connector 91 introduced from the optical cable assembly 9 includes a 6mm spring 92 and guide pins to ensure a reliable connection between the MT connectors. The upper and lower surfaces of the housing 3 are sealed, dissipated, and stored by an energy storage cover 5. The interface between the housing 3 and the energy storage cover 5 is sealed by a first conductive sealing ring 4. After the rectangular active electrical connector cable assembly is assembled, it is covered with a thermal insulation jacket 10 to provide short-term thermal insulation.

[0030] like Figure 4As shown, the connector housing 11 of plug 1 is custom-made, with threaded holes designed on the sides for mating with housing 3. The contact interface is also sealed with a conductive sealing ring. Threaded holes are also designed on the top and bottom surfaces of connector housing 11 for mating with energy storage cover 5. This connection method not only limits the freedom of movement of components in all directions after assembly, preventing relative displacement between components, but also ensures the sealing of the rectangular active electrical connector cable assembly. Plug 1 serves as an electrical interface, with 100 pin contacts inside, enabling direct soldering of printed circuit boards.

[0031] like Figure 5 As shown, the printed circuit board assembly 2 includes a first rigid printed circuit board 21, a flexible printed circuit board 22, and a second rigid printed circuit board 23. The first rigid printed circuit board 21 is provided with 100 solder holes, through which the pin contacts in the plug 1 cavity can be soldered. The first rigid printed circuit board 21 and the two second rigid printed circuit boards 23 are connected via two flexible printed circuit boards 22 to achieve electrical interconnection. A molybdenum copper block 24 is embedded in the second rigid printed circuit board 23. After embedding, one side of the molybdenum copper block is flush with the inner side of the second rigid printed circuit board 23, and a photoelectric / electro-optical conversion chip 26 is attached to the flush side. The second rigid printed circuit board 23 is provided with a photoelectric / electro-optical conversion circuit, which can convert external input optical signals into electrical signals for transmission, or vice versa. Because the optoelectronic / electro-optical conversion chip 26 is extremely sensitive to temperature, especially in high-temperature environments where it may malfunction or even fail, the other side of the molybdenum-copper block 26 protrudes from the printed circuit board surface and overlaps with the energy storage cover 5 via a thermal pad. This quickly conducts the heat generated by the optoelectronic / electro-optical conversion chip 26 to the structural components of the energy storage cover 5, ensuring the product's application in extremely high-temperature environments. After the optoelectronic / electro-optical conversion chip 26 is mounted, gold wire bonding is performed to achieve electrical interconnection between the optoelectronic / electro-optical conversion chip 26 and the second rigid printed circuit board 23, followed by coupling with the FA assembly 61. Since the optoelectronic / electro-optical conversion chip emits light vertically (or receives light vertically), the function of the MT jumper 6 is to shift the optical path of the optoelectronic / electro-optical conversion chip by 90 degrees through the FA assembly 61, ensuring that the optical cable output direction is aligned with the centerline of the plug 1. It also provides a 12-core 4mm first MT connector 62 optical interface. Each second rigid printed board 23 can realize 6-way photoelectric conversion and 6-way electro-optical conversion. The two second rigid printed boards 23 backup each other and are independently powered, preventing product failure when any of the second rigid printed boards 23 fails, thereby improving product reliability.

[0032] like Figure 6As shown, the energy storage cover plate consists of a cover plate 51 filled with PCM material 52. The cover plate 51 has a central cavity for the PCM material 52. The cover plate 51 is made of aluminum alloy 6061 and is machined and welded together. The cavity is first machined and formed, then welded together using a parallel sealing process. Only one injection port is reserved. After the cover plate 51 is tested for airtightness, the high-temperature liquid PCM material 52 is injected into the cavity of the cover plate 51 through the injection port. The injection port is then spot welded shut and polished to a smooth finish.

[0033] like Figure 7 As shown, the optical cable assembly 9 consists of two 24-core optical cables 94 mounted on a side cover. Cable assembly 9 leads to two 12-core 4mm second MT connectors 91 that mate with the 12-core 4mm first MT connector 62, achieving optical interconnection. Cable assembly 9 is mounted to housing 3 via side cover 93. Side cover 93 is a metal structure that uses crimping to hold optical cable 94 in place. A 6mm spring 92 is inserted into the optical cable and nestled within a slot in side cover 93, ensuring a tight connection between the two 4mm MT connectors.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A short-term high-temperature-resistant connector cable assembly, comprising a plug (1), a housing (3) mounted at the rear end of the plug (1), a printed circuit board assembly (2) disposed within the housing (3), and characterized in that: The printed circuit board assembly (2) comprises a first rigid printed circuit board (21) and two second rigid printed circuit boards (23) arranged side by side, and the second rigid printed circuit board (23) and the first rigid printed circuit board (21) are electrically interconnected via a flexible printed circuit board (22); the two second rigid printed circuit boards (23) serve as backup for each other and are independently powered. The top and bottom of the housing (3) are both provided with an energy storage cover plate (5); a molybdenum copper block (24) is embedded in the second rigid printed board (23); one side of the molybdenum copper block (24) is flush with the inner side of the second rigid printed board (23) and a photoelectric / electro-optical conversion chip (26) is surface mounted; the other side of the molybdenum copper block (24) protrudes from the outer side of the second rigid printed board (23) and is overlapped with the energy storage cover plate (5) via a thermal pad; The outer side of the shell (3) is provided with a heat-insulating sheath (10), and after assembly, the inner wall of the heat-insulating sheath (10) and the outer wall of the energy storage cover plate (5) are in contact with each other.

2. A short-time high-temperature-resistant connector cable assembly according to claim 1, characterized in that: A first conductive sealing ring (4) is provided at the contact interface between the housing (3) and the energy storage cover plate (5).

3. The short-term high-temperature-resistant connector cable assembly according to claim 1, characterized in that: The connector optical cable assembly further comprises an MT jumper (6) and an MT pressure plate (7); the MT jumper (6) is coupled with the photoelectric / electro-optical conversion chip (26) to lead out a first MT connector (62) through a bare optical fiber, and the first MT connector (62) is fixed in a corresponding slot of the housing (3) through the MT pressure plate (7) and screws.

4. The short-term high-temperature-resistant connector cable assembly according to claim 1, characterized in that: The energy storage cover plate (5) comprises a cover plate (51), wherein the cover plate (51) is a hollow structure and an inner cavity is filled with PCM material (52).

5. The short-term high-temperature-resistant connector cable assembly according to claim 3, characterized in that: The connector optical cable assembly further comprises an optical cable assembly (9), wherein the optical cable assembly (9) comprises a second MT connector (91) at the head end, and the second MT connector (91) is connected to the first MT connector (62).

6. A short-time high-temperature-resistant connector cable assembly according to claim 5, characterized in that: The optical cable assembly (9) further comprises a side cover plate (93) docked with the housing (3), a spring (92) is provided between the side cover plate (93) and the second MT connector (91), and an optical cable (94) is provided at the tail end of the side cover plate (93).

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