Radio frequency switch

Abstract

The invention relates to the technical field of radio frequency switches, in particular to a radio frequency switch which comprises a connector assembly, a cavity cover assembly and a coil assembly, the connector assembly comprises a center connector and a plurality of branch connectors, the cavity cover assembly comprises a cavity cover and a plurality of reeds, each reed is provided with a supporting medium, and the coil assembly is arranged on the cavity cover. The coil assembly comprises a plurality of coils, when power is off, one coil is in a magnetic state, an iron core of the coil is connected with the corresponding supporting medium, and the iron core of the coil moves downwards under the action of magnetic force to drive the corresponding supporting medium and the reed to move downwards. And the reed is respectively contacted and conducted with the central connector and one branch connector, so that when the radio frequency switch is not electrified or the switch fails, one path of the switch is still switched on, at the moment, a system connected with the switch can still work in a default state, a failure mode can be guided to a safety mode, and the service life of the switch is prolonged. And the working efficiency of the system is not influenced while time is provided for maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency switches, and in particular to a radio frequency switch. Background Art

[0002] SPnT (n≥3) switch is a single-pole multi-throw switch, which realizes the function of selecting one path from n paths, and has one input (output) port to multiple optional output (input) ports. Fig.10 This is the schematic diagram of a normally open single-pole four-throw (SP4T) RF coaxial switch. Fig.11 is its equivalent circuit, where the dotted line indicates that the branch in the switch is disconnected when no voltage is applied to the control end. Its usage is generally: the control end selects one of the four paths to be powered on, and the RF connection end only selects and closes one of the four RF branches (hence the single-pole four-throw) to meet the continuous impedance matching of the single-path transmission line. When this type of switch fails or loses power, the entire system will not be able to connect normally, affecting the normal working efficiency of the equipment / system, and may cause equipment / system failure. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a radio frequency switch, which can ensure that when the coaxial radio frequency switch is not powered on or the switch fails, one path of the switch is still connected. At this time, the system connected to this switch can still work in the default state, and the failure mode can be directed to a safe mode, which provides time for maintenance without affecting the working efficiency of the system.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A radio frequency switch comprises a connector assembly, a cavity cover assembly and a coil assembly, wherein the cavity cover assembly is located between the connector assembly and the coil assembly; The connector assembly includes a central connector and a plurality of branch connectors, wherein the plurality of branch connectors are circumferentially distributed around the central connector; The cavity cover assembly comprises a cavity cover and a plurality of springs, wherein the plurality of springs are located on a side of the cavity cover away from the coil assembly, a supporting medium is installed on each of the springs, the supporting mediums are arranged in a one-to-one correspondence with the branch connectors, one end of the supporting medium passes through the cavity cover and the supporting medium is slidably connected to the cavity cover, and a lower spring is sleeved on the outside of each of the supporting media; The coil assembly includes a plurality of coils distributed in a circle, and the coils are arranged in one-to-one correspondence with the supporting medium. When the power is off, one of the coils is in a magnetic state, and the iron core of the coil is connected to the corresponding supporting medium. The iron core of the coil moves downward under the action of the magnetic force, driving the corresponding supporting medium and the reed to move downward, so that the reed is respectively in contact with the central connector and one of the branch connectors for conduction.

[0005] The beneficial effects of the present invention are: The RF switch of the present invention comprises a connector assembly, a cavity cover assembly and a coil assembly. The connector assembly comprises a central connector and a plurality of branch connectors. The cavity cover assembly comprises a cavity cover and a plurality of reeds. A supporting medium is installed on each reed. A lower spring is sleeved on the outside of each supporting medium. The coil assembly comprises a plurality of coils distributed in a circle. The coils and the supporting medium are arranged one by one. When the power is off, one of the coils is in a magnetic state, and the iron core of the coil is connected to the corresponding supporting medium. The iron core of the coil moves downward under the action of the magnetic force, driving the corresponding supporting medium and the reed to move downward, so that the reed They are respectively in contact with the center connector and one of the branch connectors for conduction, so that when the power is off, the movement direction of the iron core of one of the magnetic coils and the other coils is opposite, and the magnetic coil is in a falling state when the power is off; the other coils are in a sucked-up state when they are not powered; after power is on, the state of one of the coils is opposite to the other coils, so it can be ensured that when the RF switch is not powered or the switch fails, the switch is still connected in one way. At this time, the system connected to this switch can still work in the default state, and the failure mode can be guided to the safe mode, which provides time for maintenance without affecting the work efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural schematic diagram of the radio frequency switch of the present invention; Figure 2 is a cross-sectional view of the radio frequency switch of the present invention; Figure 3 It is a structural schematic diagram of the cavity cover assembly of the radio frequency switch of the present invention; Figure 4 It is a structural schematic diagram of the cavity cover assembly of the radio frequency switch of the present invention; Figure 5 It is a structural schematic diagram of a connector assembly of a radio frequency switch of the present invention; Figure 6 It is a schematic structural diagram of a coil assembly of a radio frequency switch of the present invention; Figure 7 A schematic diagram of a single-pole N-throw radio frequency switch supporting a failsafe function of the radio frequency switch of the present invention; Figure 8 The single-pole N-throw radio frequency switch equivalent circuit supporting failsafe function of the radio frequency switch of the present invention; Fig. 9 A block diagram of an improved radio frequency transceiver system using a failsafe switch of the radio frequency switch of the present invention; Fig.10 It is a schematic diagram of an existing normally open single-pole four-throw radio frequency coaxial switch; Fig.11It is an equivalent circuit of an existing single-pole four-throw radio frequency coaxial switch; Description of labels: 1. Connector assembly; 11. Center connector; 12. Branch connector; 13. Base; 131. First groove; 132. Second groove; 2. Cavity cover assembly; 21. Cavity cover; 22. Spring; 23. Support medium; 24. Support isolation column; 25. Lower spring; 3. Coil assembly; 31. Coil; 311. Enameled wire; 312. Iron core; 32. Reset magnetic plate; 33. Partition plate; 34. Lower cover plate; 4. Shell; 5. Connector socket. DETAILED DESCRIPTION

[0007] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0008] Please refer to Figure 1 as well as Figure 2 , the technical solution adopted by the present invention is: A radio frequency switch comprises a connector assembly, a cavity cover assembly and a coil assembly, wherein the cavity cover assembly is located between the connector assembly and the coil assembly; The connector assembly includes a central connector and a plurality of branch connectors, wherein the plurality of branch connectors are circumferentially distributed around the central connector; The cavity cover assembly comprises a cavity cover and a plurality of springs, wherein the plurality of springs are located on a side of the cavity cover away from the coil assembly, a supporting medium is installed on each of the springs, the supporting mediums are arranged in a one-to-one correspondence with the branch connectors, one end of the supporting medium passes through the cavity cover and the supporting medium is slidably connected to the cavity cover, and a lower spring is sleeved on the outside of each of the supporting media; The coil assembly includes a plurality of coils distributed in a circle, and the coils are arranged in one-to-one correspondence with the supporting medium. When the power is off, one of the coils is in a magnetic state, and the iron core of the coil is connected to the corresponding supporting medium. The iron core of the coil moves downward under the action of the magnetic force, driving the corresponding supporting medium and the reed to move downward, so that the reed is respectively in contact with the central connector and one of the branch connectors for conduction.

[0009] From the above description, it can be seen that the beneficial effects of the present invention are: The RF switch of the present invention comprises a connector assembly, a cavity cover assembly and a coil assembly. The connector assembly comprises a central connector and a plurality of branch connectors. The cavity cover assembly comprises a cavity cover and a plurality of reeds. A supporting medium is installed on each reed. A lower spring is sleeved on the outside of each supporting medium. The coil assembly comprises a plurality of coils distributed in a circle. The coils and the supporting medium are arranged one by one. When the power is off, one of the coils is in a magnetic state, and the iron core of the coil is connected to the corresponding supporting medium. The iron core of the coil moves downward under the action of the magnetic force, driving the corresponding supporting medium and the reed to move downward, so that the reed They are respectively in contact with the center connector and one of the branch connectors for conduction, so that when the power is off, the movement direction of the iron core of one of the magnetic coils and the other coils is opposite, and the magnetic coil is in a falling state when the power is off; the other coils are in a sucked-up state when they are not powered; after power is on, the state of one of the coils is opposite to the other coils, so it can be ensured that when the RF switch is not powered or the switch fails, the switch is still connected in one way. At this time, the system connected to this switch can still work in the default state, and the failure mode can be guided to the safe mode, which provides time for maintenance without affecting the work efficiency of the system.

[0010] Furthermore, the reeds are in a strip shape, and a plurality of the reeds are distributed at equal angles on the radius of a same virtual circle, and the reeds are close to one end and are in a triangular shape.

[0011] Furthermore, supporting isolation columns are symmetrically provided on two opposite sides of each reed.

[0012] It can be seen from the above description that by providing the supporting isolation column, the downward movement of the reed can be made more stable, and the accuracy of the switch conduction is further improved.

[0013] Furthermore, two supporting isolation columns are symmetrically arranged on two opposite sides of each reed, and the two supporting isolation columns located on the same side are respectively arranged at opposite ends of the reed.

[0014] Furthermore, the connector assembly also includes a base, the central connector and the plurality of branch connectors are mounted on a side surface of the base away from the cavity cover assembly, and the conductive end of the central connector and the conductive ends of the plurality of branch connectors pass through the base.

[0015] Furthermore, one side surface of the base close to the cavity cover assembly is recessed inward to form a first groove and several second grooves, the several second grooves are arranged around the first groove, the second grooves are arranged one-to-one corresponding to the spring sheets, and the shape of the second grooves is adapted to the shape of the spring sheets, the conductive end of the center connector passes through the base to the first groove, and the conductive ends of the several branch connectors all pass through the base to the corresponding second grooves.

[0016] From the above description, it can be seen that by forming a first groove and several second grooves on the side surface of the base close to the cavity cover assembly, the spring can be in more stable contact with the conductive end of the center connector and the conductive ends of several branch connectors, thereby further improving the accuracy of switch conduction.

[0017] Furthermore, the coil assembly also includes a reset magnetic plate, a partition and a lower cover plate, and the plurality of coils are located between the partition and the lower cover plate, and the reset magnetic plate is arranged on a side surface of the partition away from the coil.

[0018] Furthermore, the iron core of the coil in a magnetic state when the power is off is connected to its corresponding supporting medium by glue.

[0019] Furthermore, the iron core of the coil which is in a magnetic state when the power is off is connected to the corresponding supporting medium via threads.

[0020] Furthermore, it also includes a shell and a connector socket, the cavity cover assembly and the coil assembly are arranged inside the shell, the connector assembly is arranged outside the shell, and the connector socket is connected to the cable in the coil through a wire.

[0021] Please refer to Figures 1 to 9 As shown, the first embodiment of the present invention is: Please refer to Figure 1 , a radio frequency switch, comprising a connector component 1, a cavity cover component 2 and a coil component 3, wherein the cavity cover component 2 is located between the connector component 1 and the coil component 3; Please refer to Figure 2 , the connector assembly 1 includes a central connector 11 and a plurality of branch connectors 12, and the plurality of branch connectors 12 are circumferentially distributed around the central connector 11; Please refer to Figure 2 The cavity cover assembly 2 includes a cavity cover 21 and a plurality of reeds 22. The reeds 22 are made of a non-ferromagnetic base material, and the surface coating is treated with special electroplating. The cavity cover 21 is made of a non-ferromagnetic base material, and the surface coating is treated with special electroplating. The reeds 22 are used to place the reeds. The plurality of reeds 22 are located on a side of the cavity cover 21 away from the coil assembly 3. A supporting medium 23 is installed on each of the reeds 22. The supporting medium 23 is arranged one-to-one with the branch connector 12. One end of the supporting medium 23 passes through the cavity cover 21 and the supporting medium 23 is slidably connected to the cavity cover 21. A lower spring 25 is sleeved on the outside of each of the supporting media 23. Please refer to Figure 2The coil assembly 3 includes a plurality of coils 31 distributed in a circle, and the coils 31 are arranged one by one with the supporting medium 23. An upper spring is provided on one end of the iron core 312 in one of the coils 31 (in this embodiment, it is positioned as the J0 end, that is, a spring is provided on one end of the iron core 312 in the J0 end coil 31). The iron core 312 with the upper spring on the coil 31 is connected to the corresponding supporting medium 23. When the power is off, the compression force of the upper spring is greater than the compression force of the lower spring 25, so that the iron core 312 in the coil 31 moves downward, driving the corresponding supporting medium 23 and the spring leaf 22 to move downward, so that the spring leaf 22 is respectively in contact with the central connector 11 and one of the branch connectors 12 for conduction.

[0022] Please refer to Figure 3 The reeds 22 are in a strip shape, and a plurality of the reeds 22 are distributed at equal angles on the radius of the same virtual circle. The reeds 22 are close to one end and are in a triangular shape.

[0023] Please refer to Figure 3 Each of the reeds 22 is symmetrically provided with supporting isolation columns 24 on two opposite sides. The supporting isolation columns 24 are made of composite materials and have the advantages of high flame retardancy, thermal stability, high mechanical strength, etc., and are fixed on the cavity cover 21.

[0024] Please refer to Figure 3 Two supporting isolation columns 24 are symmetrically arranged on opposite sides of each reed 22 , and the two supporting isolation columns 24 on the same side are respectively arranged at opposite ends of the reed 22 .

[0025] Please refer to Figure 2 and Figure 5 The connector assembly 1 also includes a base 13, which is made of a non-ferromagnetic base material and is used to fix a center connector 11 and a plurality of branch connectors 12. The center connector 11 and the plurality of branch connectors 12 are all installed on a side surface of the base 13 away from the cavity cover assembly 2, and the conductive ends of the center connector 11 and the conductive ends of the plurality of branch connectors 12 all pass through the base 13.

[0026] Please refer to Figure 2 and Figure 5 The base 13 is recessed inward on one side surface close to the cavity cover assembly 2 to form a first groove 131 and a plurality of second grooves. The plurality of second grooves are arranged around the first groove 131. The second grooves are arranged one-to-one with the spring sheets 22, and the shape of the second grooves is adapted to the shape of the spring sheets 22. The conductive end of the center connector 11 passes through the base 13 to the first groove 131, and the conductive ends of the plurality of branch connectors 12 all pass through the base 13 to the corresponding second grooves.

[0027] Please refer to Figure 6 The coil assembly 3 also includes a reset magnetic plate 32, a partition 33 and a lower cover 34. Several coils 31 are located between the partition 33 and the lower cover 34. The reset magnetic plate 32 is arranged on a side surface of the partition 33 away from the coil 31.

[0028] The resetting magnetic attraction plate 32 is made of a ferromagnetic base material, the coil 31 is composed of an enameled wire 311 and an iron core 312, the enameled wire 311 is wound around the outside of the iron core 312, and the lower cover plate 34 is made of a non-ferromagnetic base material.

[0029] The iron core of the coil 31 which is in a magnetic state when the power is off is connected to the corresponding supporting medium 23 by means of threads or glue.

[0030] Please refer to Figure 1 , and also includes a shell 4 and a connector socket 5. The shell 4 is electroplated and has excellent corrosion resistance. The cavity cover assembly 2 and the coil assembly 3 are arranged inside the shell 4, and the connector assembly 1 is arranged outside the shell 4. The connector socket 5 is connected to the cable in the coil 31 through a wire.

[0031] When the power is off, the magnetized coil 31 at the J0 end is in a magnetized state, and the iron core 312 at the J0 end moves downward under the action of the magnetic force, driving the supporting medium 23 and the reed 22 to move downward, so that the reed 22 is respectively in contact with the center connector 11 and one of the branch connectors 12 to achieve the conduction function when the power is not on.

[0032] When power is turned on, the magnetic coil 31 at the J0 end is electrically demagnetized, and the lower spring 25 at the J0 end drives the iron core 312, the supporting medium 23 and the reed 22 at the J0 end to move upward, so that the reed 22 is disconnected from the central connector 11 and one of the branch connectors 12 respectively, realizing the disconnection function when power is turned on.

[0033] Under the premise of ensuring low intermodulation and high reliability of the RF switch, this solution adds a failsafe function (Failsafe refers to the failsafe mode. When there is no voltage on the control end or the switch fails, the switch connects to a certain channel by default to protect the device or maintain normal operation of the device). From the perspective of the transceiver system, under the premise of ensuring that the functions and performance of the RF transceiver system are not reduced, the overall design is simplified, the reliability is improved, the RF switches and external cable components (RF cables and connectors) are reduced, the key indicator of insertion loss is improved, and the total types, total quantity, total volume, and total cost of external mounting fixtures are reduced.

[0034] The schematic diagram of the coaxial RF switch with low intermodulation, high reliability and failsafe function is as follows: Figure 7 shown.

[0035] like Figure 7 As shown in , the solenoid at the J0 end (i.e., coil 31) and the iron core 312 of the other solenoids (i.e., coil 31) move in opposite directions. The solenoid at the J0 end is in a falling state when not powered on, i.e., the COM end and the J0 end are connected; the other solenoids at the J1~JN ends are in a sucking state when not powered on, i.e., the COM end and the JN end are disconnected; after power-on, the solenoid at the J0 end is in the opposite state to the other solenoids. This state can ensure that when the coaxial RF switch is not powered on or the switch fails, the switch is still connected one way. At this time, the system connected to this switch can still work in the default state, and the failure mode can be directed to the safety mode, which provides time for maintenance without affecting the working efficiency of the equipment / system; the equivalent circuit of this type of switch is as follows Figure 8 shown.

[0036] The use of failsafe RF switches can simplify the number of system-level switches. Fig. 9 The block diagram of the improved RF transceiver system using the switch is shown in FIG.

[0037] Fig. 9 The RF switch 1 and RF switch 2 in the system are failsafe RF switches, which are connected to the J0 terminal by default. When the system is not powered on or fails, the direct path will be connected by default. The system before the improvement needs to use at least four RF switches to achieve the same function, that is, RF switch 1 needs to use a single-pole double-throw switch and a normally-open single-pole multi-throw switch, and RF switch 2 needs to use a single-pole double-throw switch and a normally-open single-pole multi-throw switch. The low intermodulation and high-reliability RF switch that supports failsafe reduces the RF connection between devices while ensuring the functional performance of the entire system, simplifies the composition of the entire system, and simplifies the control signal of the system.

[0038] In summary, a radio frequency switch provided by the present invention includes a connector assembly, a cavity cover assembly, and a coil assembly. The connector assembly includes a central connector and a plurality of branch connectors. The cavity cover assembly includes a cavity cover and a plurality of reed switches. A support medium is installed on each reed switch, and a lower spring is sleeved outside each support medium. The coil assembly includes a plurality of coils distributed in a circumferential manner, and the coils are arranged in one-to-one correspondence with the support media. When powered off, one of the coils is in a magnetic state, and the iron core of the coil is connected to its corresponding support medium. The iron core of the coil moves downward under the action of magnetic force, driving the corresponding support medium and reed switch to move downward, so that the reed switches are respectively in contact with the central connector and one of the branch connectors to conduct. In this way, the movement directions of the iron cores of one of the coils that is magnetic when powered off and the remaining coils are opposite. The coil that is magnetic when powered off is in a fallen state when not powered on; the remaining coils are in a lifted state when not powered on; after power-on, the states of one of the coils and the remaining coils are opposite. Therefore, it can be ensured that when the radio frequency switch is not powered on or fails, one path of the switch is still connected. At this time, the system connected to this switch can still operate in the default state, and the fault mode can be directed to the safe mode, providing time for maintenance without affecting the working efficiency of the system.

[0039] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A radio frequency switch, characterized in that: It comprises a connector assembly, a cavity cover assembly and a coil assembly, wherein the cavity cover assembly is located between the connector assembly and the coil assembly; The connector assembly includes a central connector and a plurality of branch connectors, wherein the plurality of branch connectors are circumferentially distributed around the central connector; The cavity cover assembly comprises a cavity cover and a plurality of springs, wherein the plurality of springs are located on a side of the cavity cover away from the coil assembly, a supporting medium is installed on each of the springs, the supporting mediums are arranged in a one-to-one correspondence with the branch connectors, one end of the supporting medium passes through the cavity cover and the supporting medium is slidably connected to the cavity cover, and a lower spring is sleeved on the outside of each of the supporting media; The coil assembly includes a plurality of coils distributed in a circle, and the coils are arranged in one-to-one correspondence with the supporting medium. When the power is off, one of the coils is in a magnetic state, and the iron core of the coil is connected to the corresponding supporting medium. The iron core of the coil moves downward under the action of the magnetic force, driving the corresponding supporting medium and the reed to move downward, so that the reed is respectively in contact with the central connector and one of the branch connectors for conduction.

2. The radio frequency switch according to claim 1, characterized in that: The reeds are in strip shape, and a plurality of the reeds are distributed at equal angles on the radius of a same virtual circle. The reeds are close to one end and are in a triangular shape.

3. The radio frequency switch according to claim 2, characterized in that: Supporting isolation columns are symmetrically arranged on two opposite sides of each reed.

4. The radio frequency switch according to claim 3, characterized in that: Two supporting isolation columns are symmetrically arranged on two opposite sides of each reed, and the two supporting isolation columns located on the same side are respectively arranged at two opposite ends of the reed.

5. The radio frequency switch according to claim 1, characterized in that: The connector assembly also includes a base, the central connector and several branch connectors are installed on a side surface of the base away from the cavity cover assembly, and the conductive ends of the central connector and several branch connectors pass through the base.

6. The radio frequency switch according to claim 5, characterized in that: One side surface of the base close to the cavity cover assembly is recessed inward to form a first groove and a plurality of second grooves, the plurality of second grooves are arranged around the first groove, the second grooves are arranged one-to-one corresponding to the spring sheets, and the shape of the second grooves is adapted to the shape of the spring sheets, the conductive end of the center connector passes through the base to the first groove, and the conductive ends of the plurality of branch connectors all pass through the base to the corresponding second grooves.

7. The radio frequency switch according to claim 1, characterized in that: The coil assembly also includes a reset magnetic attraction plate, a partition and a lower cover plate. The plurality of coils are located between the partition and the lower cover plate. The reset magnetic attraction plate is arranged on a side surface of the partition away from the coil.

8. The radio frequency switch according to claim 1, characterized in that: The iron core of the coil which is in a magnetic state when the power is off is connected to its corresponding supporting medium by glue.

9. The radio frequency switch according to claim 1, characterized in that: The iron core of the coil which is in a magnetic state when the power is off is connected to its corresponding supporting medium through a thread.

10. The radio frequency switch according to claim 1, characterized in that: It also includes a shell and a connector socket. The cavity cover assembly and the coil assembly are arranged inside the shell, the connector assembly is arranged outside the shell, and the connector socket is connected with the cable in the coil through a wire.

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