A highly efficient shielded compartment filter plug

Abstract

The present invention discloses a highly efficient shielded compartment-type filter plug, comprising a metal shell, an insulator, a power pin, a signal pin, a through-hole capacitor, a metal ground plate, a metal partition, and a metal cover. The metal ground plate is installed in the middle section of the metal shell and is in close contact with the through-hole capacitors. The shells of multiple through-hole capacitors pass through multiple through holes on the metal ground plate and are in close contact with the through-hole capacitors. The metal partition divides the shielded inner cavity between the metal ground plate and the metal cover into two compartments. One end of the through-hole pin of the through-hole capacitor corresponding to the power pin and one end of the through-hole pin of the through-hole capacitor corresponding to the signal pin are respectively placed in the two compartments. The present invention utilizes the metal ground plate, the metal partition, the metal cover, and the metal shell to form two compartments with good electromagnetic shielding effect, thereby avoiding electromagnetic coupling interference between the power terminal and the signal terminal, so that the electrical connector using this plug can meet electromagnetic compatibility requirements.

Description

Technical Field

[0001] The present invention relates to a plug for an electrical connector, and in particular to a highly efficient shielded compartment-type filter plug, belonging to the technical field of electrical connectors. Background Art

[0002] With the continuous expansion of the application of electrical connectors, their functions are no longer limited to simple power connection or electrical signal connection functions. For example, some electrical connectors need to integrate power connection and signal connection functions together, which will put higher performance requirements on the electrical connectors.

[0003] Traditional electrical connector plugs lack compartments and filtering capabilities. Traditional electrical connector filtering is typically achieved by adding filtering components or circuits to the receptacle, creating a filtered electrical connector. However, without compartments, electromagnetic coupling interference still exists between the filtered power and signal cables. Therefore, simply transferring the filtering capabilities of traditional receptacles to plugs is not feasible.

[0004] With the increasing demand for multifunctionality and weight reduction in equipment, more and more pins are being designed on the same electrical connector, and the electromagnetic coupling interference between power and signal is becoming increasingly serious. Traditional filter electrical connectors that have filter elements or filter circuits installed on the socket cannot effectively achieve electromagnetic isolation between the power connection line connector and the signal connection line connector because they lack a compartment structure. At the same time, because the plugs of traditional electrical connectors do not have electromagnetic isolation functions, electromagnetic interference from different external devices can affect the equipment connected to the socket. Therefore, traditional filter electrical connectors are no longer able to achieve effective filtering and electromagnetic decoupling functions, resulting in traditional electrical connectors being unable to meet electromagnetic compatibility requirements. In addition, neither the plugs nor the sockets of traditional electrical connectors have lightning protection and voltage spike protection functions. These functions can only be added to other filter components, resulting in large and heavy products that are not conducive to application. Summary of the Invention

[0005] The object of the present invention is to provide a high-efficiency shielded compartment filter plug with filtering function and good shielding effect in order to solve the above problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A highly efficient shielded compartment filter plug comprises a metal shell, an insulator, a power pin and a signal pin, one end of the insulator is placed in the first end of the two ends of the metal shell, the two power pins and the plurality of signal pins respectively pass through the corresponding through holes on the insulator, the highly efficient shielded compartment filter plug also comprises a through-hole capacitor for filtering, a metal grounding plate, a metal partition and a metal cover plate, the metal grounding plate is installed in the middle section of the metal shell and is in close contact, the metal grounding plate is perpendicular to the center line of the central through hole of the metal shell, one end of the through-hole pins of the plurality of through-hole capacitors is respectively connected to the two power pins and the plurality of signal pins, the shells of the plurality of through-hole capacitors pass through the plurality of through holes on the metal grounding plate and are in close contact, the metal cover plate It is connected to the second end of the two ends of the metal shell, and the space in the metal shell between the metal grounding plate and the metal cover plate forms a shielding inner cavity. The other ends of the through-hole pins of the multiple through-hole capacitors are all placed in the shielding inner cavity. The metal partition is placed in the shielding inner cavity and one end of it is connected to the metal grounding plate and the other end is in close contact with the inner wall of the metal cover plate. The metal partition and the metal grounding plate are perpendicular to each other. The metal partition divides the shielding inner cavity into two compartments, and the other ends of the through-hole pins of the two through-hole capacitors corresponding to the power plug and the other ends of the through-hole pins of the multiple through-hole capacitors corresponding to the signal plug are respectively placed in the two compartments. The positions corresponding to the two compartments on the metal cover plate are respectively provided with cable through holes for passing cables.

[0008] Preferably, in order to install the metal grounding plate more stably and reliably and enhance the conductivity between it and the metal shell, the inner wall of the metal shell is provided with a first annular step, the metal grounding plate is in close contact with the first annular step, and the edge of the metal grounding plate is welded to the inner wall of the metal shell.

[0009] Preferably, in order to make the stability between the metal grounding plate and the metal partition higher and to install the metal partition more stably and to facilitate the partitioning and identification of the through-hole capacitors corresponding to the power pins and the signal pins, the metal grounding plate and the metal partition are formed as one piece, and the two side edges of the metal partition extend out of the corresponding edges of the metal grounding plate to form a partition convex edge, and the inner wall of the metal shell is provided with partition limiting grooves on opposite sides, and the two partition convex edges are respectively placed in the two partition limiting grooves.

[0010] Preferably, in order to facilitate the stable installation of the metal cover and avoid the metal cover affecting the connection between the plug and other devices, a second annular step is provided on the inner wall of the second end of the metal shell, and the metal cover is placed in the second end of the metal shell and is in close contact with the second annular step. Outward protruding strips are respectively provided on both sides of the outer peripheral edge of the metal cover, and the two protruding strips are respectively placed in the two partition limiting grooves. A plurality of cover mounting through holes are provided on the metal cover at a position between the two cable through holes, and a plurality of screw holes are provided on the end face of the metal partition close to the metal cover, and a plurality of screws are respectively passed through the plurality of cover mounting through holes and connected to the corresponding plurality of screw holes.

[0011] Preferably, in order to avoid the problem of the through-hole needle of the through-hole capacitor easily falling off when welding with the wire and to improve the stability and reliability of the connection with the wire, the high-efficiency shielded compartment filter plug also includes two first printed circuit boards respectively installed in the two compartments, and the first printed circuit board is provided with a plurality of groups of welding through holes corresponding to the plurality of through-hole capacitors one by one, each group of the welding through holes includes two welding through holes that are electrically conductive to each other, and the through-hole needle of each through-hole capacitor passes through one of the welding through holes in the corresponding group of the welding through holes and are electrically conductive to each other, and the other welding through hole in each group of the welding through holes is used for welding connection with the corresponding wire.

[0012] Preferably, in order to install the two first printed circuit boards more stably and reliably, a countersunk hole is provided on the side surface of the metal grounding plate close to the first printed circuit board and a third annular step is provided on the circumferential wall of the countersunk hole. The two first printed circuit boards are respectively close to the third annular step, and the outer edges of the two first printed circuit boards are respectively covered with metal rings and are welded to the hole wall of the countersunk hole of the metal grounding plate and the corresponding surface of the metal partition through the metal rings.

[0013] Preferably, in order to facilitate better limiting of the through-hole needles of the through-hole capacitor to improve its stability and reliability, the high-efficiency shielded compartment-type filter plug also includes a second printed circuit board arranged between the metal ground plate and the insulator, and a plurality of limiting through holes are provided on the second printed circuit board. The through-hole needles of the plurality of through-hole capacitors respectively pass through the plurality of limiting through holes on the second printed circuit board and are connected to the corresponding power pins or the signal pins.

[0014] Preferably, in order to install the second printed circuit board more stably and reliably, a fourth annular step is provided on the inner wall of the metal shell, the second printed circuit board is in close contact with the fourth annular step and is tightly fixed by one end of the insulator, a positioning groove is provided on the inner wall of the metal shell, and a positioning bar is provided on the edge of the second printed circuit board, and the positioning bar is placed in the positioning groove.

[0015] Preferably, to provide lightning protection and voltage spike protection for the plug, TVS diodes are installed on the second printed circuit board between the two limiting holes corresponding to the power pins and adjacent to all limiting holes on the second printed circuit board. The TVS diode between the two limiting holes corresponding to the power pins is a bidirectional TVS diode, while the TVS diodes adjacent to all limiting holes on the second printed circuit board are unidirectional TVS diodes. The cathode of each unidirectional TVS diode is conductively connected to all limiting holes, and the anodes of each of the unidirectional TVS diodes are conductively connected to the metal housing. A TVS diode is a transient voltage suppression diode. Under specified reverse application conditions, when subjected to a high-energy transient overvoltage pulse, its operating impedance can immediately drop to a very low conduction value, allowing large current to pass and clamping the voltage to a predetermined level, thereby effectively protecting the precision components in the electronic circuit from damage. TVS diodes include unidirectional TVS diodes and bidirectional TVS diodes.

[0016] Preferably, in order to improve the stability and reliability of the connection between the unidirectional TVS diode and the metal shell, the outer peripheral edge of the second printed circuit board is covered with a metal ring and is in close contact with the inner wall of the metal shell and the fourth annular step through the metal ring, and the positive electrodes of the multiple unidirectional TVS diodes are all conductively connected to the metal ring.

[0017] The beneficial effects of the present invention are:

[0018] The present invention installs a through-hole capacitor in the plug, so that the plug has a filtering function, and uses a metal ground plate, a metal partition, a metal cover plate and a metal shell to form two compartments with good electromagnetic shielding effect. The connection terminals of the through-hole pins of the two through-hole capacitors corresponding to the power pins and the connection terminals of the through-hole pins of multiple through-hole capacitors corresponding to the signal pins are respectively placed in the two compartments, thereby avoiding electromagnetic coupling interference between the power connection terminals and the signal connection terminals, so that the electrical connector using this plug can achieve effective filtering and de-electromagnetic coupling functions and meet electromagnetic compatibility requirements; by using a first printed circuit board to transfer the wire welding position of the through-hole pins of the through-hole capacitors, the problem of loose welding and easy falling off of the through-hole pins and the wires is avoided, and the stability and reliability of the connection between the through-hole capacitors and the wires is improved; by installing a TVS diode on the second printed circuit board, the plug has the functions of lightning protection and voltage spike protection, without adding this function to other components, which can reduce the product volume and weight and facilitate application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the three-dimensional exploded views of the efficient shielded compartment filter plug of the present invention before assembly;

[0020] Figure 2This is the second three-dimensional exploded view of the efficient shielded compartment filter plug before assembly of the present invention, and Figure 1 Different perspectives;

[0021] Figure 3 This is a three-dimensional diagram of the assembled high-efficiency shielded compartment filter plug of the present invention;

[0022] Figure 4 It is a main sectional view of the assembled efficient shielded compartment filter plug of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings:

[0024] like Figures 1-4 As shown, the efficient shielded compartment filter plug of the present invention includes a metal shell 9, an insulator 2, a power pin 4, a signal pin 3, a through-hole capacitor 7, a metal grounding plate 12, a metal partition 14 and a metal cover 18. One end of the insulator 2 is placed in the first end 8 (the left end in the figure) of the two ends of the metal shell 9, two power pins 4 and multiple signal pins 3 respectively pass through the corresponding through holes on the insulator 2, the metal grounding plate 12 is installed in the middle section of the metal shell 9 and is in close contact with it, the metal grounding plate 12 is perpendicular to the center line of the central through hole of the metal shell 9, one end of the through-hole pins 6 of multiple through-hole capacitors 7 for filtering are respectively connected to the two power pins 4 and multiple signal pins 3 in a one-to-one correspondence, the shells of the multiple through-hole capacitors 7 pass through the multiple through holes on the metal grounding plate 12 and are in close contact with the second end of the metal shell 9. The metal shell 9 is connected to the metal grounding plate 12 and the metal cover 18 in the space between the metal grounding plate 12 and the metal cover 18 to form a shielding cavity (not marked in the figure). The other ends of the through-hole needles 6 of the multiple through-hole capacitors 7 are placed in the shielding cavity. The metal partition 14 is placed in the shielding cavity and one end of it is connected to the metal grounding plate 12 and the other end is in close contact with the inner wall of the metal cover 18. The metal partition 14 and the metal grounding plate 12 are perpendicular to each other. The metal partition 14 divides the shielding cavity into two compartments (not marked in the figure). The other ends of the through-hole needles 6 of the two through-hole capacitors 7 corresponding to the power pin 4 and the other ends of the through-hole needles 6 of the multiple through-hole capacitors 7 corresponding to the signal pin 3 are respectively placed in the two compartments. The positions corresponding to the two compartments on the metal cover 18 are respectively provided with cable through-holes 19 for the cables to pass through.

[0025] like Figures 1-4 As shown, the present invention also discloses the following multiple more specific preferred structures. According to actual needs, the above structure can be superimposed and combined with one or more of the following structures to form multiple more optimized technical solutions.

[0026] In order to install the metal grounding plate 12 more stably and reliably and enhance the conductivity between it and the metal shell 9, the inner wall of the metal shell 9 is provided with a first annular step (not marked in the figure), and the metal grounding plate 12 is in close contact with the first annular step, and the edge of the metal grounding plate 12 is welded to the inner wall of the metal shell 9.

[0027] In order to make the stability between the metal grounding plate 12 and the metal partition 14 higher and to install the metal partition 14 more stably and to facilitate the partition identification of the through-hole capacitors 7 corresponding to the power pin 4 and the signal pin 3, the metal grounding plate 12 and the metal partition 14 are formed as one piece, and the two side edges of the metal partition 14 extend out of the corresponding edges of the metal grounding plate 12 to form a partition convex edge (not marked in the figure), and the inner wall of the metal shell 9 is provided with partition limiting grooves 11 on the opposite sides, and the two partition convex edges are respectively placed in the two partition limiting grooves 11.

[0028] In order to facilitate the stable installation of the metal cover 18 and prevent the metal cover 19 from affecting the connection between the plug and other devices, the inner wall of the second end 10 of the metal shell 9 is provided with a second annular step (not marked in the figure), and the metal cover 18 is placed in the second end 10 of the metal shell 9 and is in close contact with the second annular step. The outer edge of the metal cover 18 is provided with outward protruding ridges 17 on both sides, and the two ridges 17 are respectively placed in the two partition limiting grooves 11. A plurality of cover mounting through holes (not marked in the figure) are provided on the metal cover 18 at a position between the two cable through holes 19. A plurality of screw holes (not marked in the figure) are provided on the end face of the metal partition 14 close to the metal cover 18. A plurality of screws 16 are respectively passed through the plurality of cover mounting through holes and connected to the corresponding plurality of screw holes.

[0029] In order to avoid the problem of easy detachment of the through-hole needle 6 of the through-hole capacitor 7 and the wire (not shown in the figure) during welding and to improve the stability and reliability of the connection with the wire, the said efficient shielded compartment type filter plug also includes two first printed circuit boards 15 respectively installed in the two compartments, and the first printed circuit board 15 is provided with a plurality of groups of welding through holes (not marked in the figure) corresponding to the plurality of through-hole capacitors 7 one by one, each group of the welding through holes includes two welding through holes that are electrically conductive to each other, and the through-hole needle 6 of each through-hole capacitor 7 passes through one of the welding through holes in the corresponding group of the welding through holes and is electrically conductive to each other, and the other welding through hole in each group of the welding through holes is used for welding connection with the corresponding wire.

[0030] In order to install the two first printed circuit boards 15 more stably and reliably, a countersunk hole 13 is provided on the side surface of the metal grounding plate 12 close to the first printed circuit board 15, and a third annular step (not marked in the figure) is provided on the circumferential wall of the countersunk hole 13. The two first printed circuit boards 15 are respectively close to the third annular step. The outer edges of the two first printed circuit boards 15 are respectively covered with metal rings (not shown in the figure) and are welded to the hole wall of the countersunk hole 13 of the metal grounding plate 12 and the corresponding surface of the metal partition 14 through the metal rings.

[0031] In order to facilitate better limiting of the through-hole needles 6 of the through-hole capacitors 7 to improve their stability and reliability, the highly efficient shielded compartment-type filter plug also includes a second printed circuit board 5 arranged between the metal ground plate 12 and the insulator 2. The second printed circuit board 5 is provided with a plurality of limiting through holes (not marked in the figure). The through-hole needles 6 of the plurality of through-hole capacitors 7 respectively pass through the plurality of limiting through holes on the second printed circuit board 5 and are connected to the corresponding power pins 4 or signal pins 3.

[0032] In order to install the second printed circuit board 5 more stably and reliably, a fourth annular step (not marked in the figure) is provided on the inner wall of the metal shell 9. The second printed circuit board 5 is in close contact with the fourth annular step and is tightly fixed by one end of the insulator 2. A positioning groove 21 is provided on the inner wall of the metal shell 9, and a positioning bar (not marked in the figure) is provided on the edge of the second printed circuit board 5. The positioning bar is placed in the positioning groove 21.

[0033] To provide lightning protection and voltage spike protection for the plug, TVS diodes 20 are installed between the position-limiting through-holes corresponding to the two power pins 4 on the second printed circuit board 5 and next to all the position-limiting through-holes on the second printed circuit board 5. The TVS diodes 20 between the position-limiting through-holes corresponding to the two power pins 4 are bidirectional TVS diodes, while the TVS diodes 20 next to all the position-limiting through-holes on the second printed circuit board 5 are unidirectional TVS diodes. The cathodes of the unidirectional TVS diodes are conductively connected to all the position-limiting through-holes, and the anodes of the multiple unidirectional TVS diodes are conductively connected to the metal housing 9.

[0034] Preferably, in order to improve the stability and reliability of the connection between the unidirectional TVS diode and the metal shell 9, the outer peripheral edge of the second printed circuit board 5 is covered with a metal ring (not shown in the figure) and the metal ring is in close contact with the inner wall of the metal shell 9 and the fourth annular step, and the positive electrodes of multiple unidirectional TVS diodes are conductively connected to the metal ring.

[0035] Figures 1-4 Also shown is an insulating plate 1 arranged outside the insulator 2, which is used to better position the power pin 4 and the signal pin 3. The outer walls of the first end 8 and the second end 10 of the metal shell 9 are respectively provided with external threads, which are conventional structures.

[0036] like Figures 1-4 As shown, when in use, the power cable (not shown) and the signal cable are respectively passed through the corresponding cable through-holes 19, the two wires of the power cable are respectively passed through the two welding through-holes corresponding to the two power pins 4 on a first printed circuit board 15 and welded, and the multiple wires of the signal cable are respectively passed through the multiple welding through-holes corresponding to the multiple signal pins 3 on another first printed circuit board 15 and welded, and connected to the socket (not shown) through the external thread of the first end 8 of the metal shell 9, so that the power pin 4 and the signal pin 3 are respectively plugged into the power jack and signal jack of the socket, that is, an electrical connector with electromagnetic isolation function, filtering function, lightning protection and voltage spike protection function is formed.

[0037] The above embodiments are only preferred embodiments of the present invention and are not limitations on the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A highly efficient shielded compartment filter plug, comprising a metal housing, an insulator, a power pin, and a signal pin, wherein one end of the insulator is positioned within a first end of the metal housing, and two power pins and a plurality of signal pins respectively pass through corresponding through holes in the insulator, characterized in that: The efficient shielded compartment filter plug also includes a through-hole capacitor, a metal grounding plate, a metal partition and a metal cover plate for filtering. The metal grounding plate is installed in the middle section of the metal shell and is in close contact. The metal grounding plate is perpendicular to the center line of the central through hole of the metal shell. One end of the through-hole needles of the plurality of through-hole capacitors is respectively connected to the two power pins and the plurality of signal pins in a one-to-one correspondence. The shells of the plurality of through-hole capacitors pass through the plurality of through holes on the metal grounding plate and are in close contact. The metal cover plate is connected to the second end of the two ends of the metal shell. The space between the metal grounding plate and the metal cover plate in the metal shell forms A shielding inner cavity, the other ends of the through-hole needles of the plurality of through-hole capacitors are placed in the shielding inner cavity, the metal partition is placed in the shielding inner cavity and one end of the metal partition is connected to the metal grounding plate and the other end is in close contact with the inner wall of the metal cover, the metal partition and the metal grounding plate are perpendicular to each other, the metal partition divides the shielding inner cavity into two compartments, the other ends of the through-hole needles of the two through-hole capacitors corresponding to the power plugs and the other ends of the through-hole needles of the plurality of through-hole capacitors corresponding to the signal plugs are respectively placed in the two compartments, and cable through holes for passing cables are respectively provided at positions corresponding to the two compartments on the metal cover.

2. The high-efficiency shielded compartment filter plug according to claim 1, characterized in that: The inner wall of the metal shell is provided with a first annular step, the metal grounding plate is in close contact with the first annular step, and the edge of the metal grounding plate is welded to the inner wall of the metal shell.

3. The high-efficiency shielded compartment filter plug according to claim 1, characterized in that: The metal grounding plate and the metal partition are integrally formed, and the two side edges of the metal partition extend out of the corresponding edges of the metal grounding plate to form a partition convex edge. The inner wall of the metal shell is provided with partition limiting grooves on opposite sides, and the two partition convex edges are respectively placed in the two partition limiting grooves.

4. The high-efficiency shielded compartment filter plug according to claim 3, characterized in that: A second annular step is provided on the inner wall of the second end of the metal shell, the metal cover is placed in the second end of the metal shell and is in close contact with the second annular step, outward protruding ridges are respectively provided on both sides of the outer peripheral edge of the metal cover, and the two ridges are respectively placed in the two partition limiting grooves, and a plurality of cover mounting through holes are provided on the metal cover at a position between the two cable through holes, and a plurality of screw holes are provided on the end face of the metal partition close to the metal cover, and a plurality of screws are respectively passed through the plurality of cover mounting through holes and connected to the corresponding plurality of screw holes.

5. The high-efficiency shielded compartment filter plug according to any one of claims 1 to 4, characterized in that: The high-efficiency shielded compartment-type filter plug also includes two first printed circuit boards respectively installed in the two compartments, and the first printed circuit boards are provided with multiple groups of welding through holes corresponding one-to-one to the multiple through-hole capacitors, each group of the welding through holes includes two welding through holes that are electrically conductive to each other, and the through-hole needle of each through-hole capacitor passes through one of the welding through holes in the corresponding group and is electrically conductive to each other, and the other welding through hole in each group of the welding through holes is used for welding connection with the corresponding wire.

6. The high-efficiency shielded compartment filter plug according to claim 5, characterized in that: A countersunk hole is provided on one side surface of the metal grounding plate close to the first printed circuit board, and a third annular step is provided on the circumferential wall of the countersunk hole. The two first printed circuit boards are respectively close to the third annular step. The outer edges of the two first printed circuit boards are respectively covered with metal rings and are welded to the hole wall of the countersunk hole of the metal grounding plate and the corresponding surface of the metal partition through the metal rings.

7. The high-efficiency shielded compartment filter plug according to any one of claims 1 to 4, characterized in that: The highly efficient shielded compartment filter plug also includes a second printed circuit board arranged between the metal ground plate and the insulator, and a plurality of limiting through holes are provided on the second printed circuit board. The through-hole pins of the plurality of through-hole capacitors respectively pass through the plurality of limiting through holes on the second printed circuit board and are connected to the corresponding power pins or the signal pins.

8. The high-efficiency shielded compartment filter plug according to claim 7, characterized in that: A fourth annular step is provided on the inner wall of the metal shell, the second printed circuit board is in close contact with the fourth annular step and is tightly fixed by one end of the insulator, a positioning groove is provided on the inner wall of the metal shell, and a positioning bar is provided on the edge of the second printed circuit board, and the positioning bar is placed in the positioning groove.

9. The high-efficiency shielded compartment filter plug according to claim 8, characterized in that: TVS diodes are installed on the second printed circuit board between the limiting through holes corresponding to the two power pins and next to all the limiting through holes on the second printed circuit board. The TVS diode between the limiting through holes corresponding to the two power pins is a bidirectional TVS diode, and the TVS diodes next to all the limiting through holes on the second printed circuit board are unidirectional TVS diodes. The cathode of the unidirectional TVS diode is conductively connected to all the limiting through holes, and the anodes of the multiple unidirectional TVS diodes are conductively connected to the metal shell.

10. The high-efficiency shielded compartment filter plug according to claim 9, characterized in that: The outer peripheral edge of the second printed circuit board is covered with a metal ring and is in close contact with the inner wall of the metal shell and the fourth annular step through the metal ring, and the positive electrodes of the multiple unidirectional TVS diodes are all conductively connected to the metal ring.

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