EP2720246A1 - RF thermal fuse - Google Patents
RF thermal fuse Download PDFInfo
- Publication number
- EP2720246A1 EP2720246A1 EP13187898.5A EP13187898A EP2720246A1 EP 2720246 A1 EP2720246 A1 EP 2720246A1 EP 13187898 A EP13187898 A EP 13187898A EP 2720246 A1 EP2720246 A1 EP 2720246A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thermal
- transmission line
- fuse
- temperature
- protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000679 solder Inorganic materials 0.000 claims description 33
- 230000002441 reversible effect Effects 0.000 claims description 18
- 239000003989 dielectric material Substances 0.000 claims description 12
- 230000002427 irreversible effect Effects 0.000 claims description 10
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- 230000008018 melting Effects 0.000 claims description 10
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- 238000005476 soldering Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 2
- 238000013021 overheating Methods 0.000 abstract description 21
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- 229910000634 wood's metal Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/767—Normally open
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/36—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/24—Terminating devices
- H01P1/28—Short-circuiting plungers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/30—Auxiliary devices for compensation of, or protection against, temperature or moisture effects ; for improving power handling capability
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Definitions
- the present invention relates generally to telecommunications systems and more particularly (although not necessarily exclusively) to thermal fuses for preventing overheating of RF devices in a telecommunication system.
- a telecommunications device can include a cooling mechanism that can maintain the temperature of internal components of the telecommunications device such that the internal components are not damaged by heat.
- An example of a cooling mechanism can include a forced airflow provided by a cooling fan.
- a cooling mechanism such as a cooling fan can be powered by a power source in the telecommunications device.
- Deficiencies in the power source can cause power to cease being provided to the cooling mechanism.
- Deficiencies in the power source can include (but are not limited to) a defective power supply, a switching off of the power source, an over-current fuse trip, etc.
- the loss of power to the cooling mechanism can cause the RF termination device or other components of the telecommunications device to increase in temperature such that the components will be overstrained, defective, and/or dangerous to touch.
- Certain aspects and features of the present invention are directed to thermal fuses for preventing overheating of RF devices in a telecommunication system.
- an RF thermal fuse in one aspect, includes a body, a conductive bolt, and a driving mechanism.
- the body can be positioned on a transmission line between an RF signal source and an RF device.
- the conductive bolt is positioned in the body.
- the conductive bolt has a length sufficient to provide impedance at a point of protection on the transmission line in response to the conductive bolt contacting a live conductor of the transmission line.
- the impedance is sufficient to reflect a portion of the incident power of an RF signal from the RF source.
- the driving mechanism can cause the conductive bolt to contact the live conductor in response to a temperature at or near the point of protection exceeding a threshold temperature.
- a thermal protection system in another aspect, includes multiple RF fuses.
- Each RF fuse includes a body, a conductive bolt, and a driving mechanism.
- the body can be positioned on a transmission line between an RF signal source and an RF device.
- the conductive bolt is positioned in the body.
- the conductive bolt has a length sufficient to provide impedance at a point of protection on the transmission line in response to the conductive bolt contacting a live conductor of the transmission line.
- the driving mechanism can cause the conductive bolt to contact the live conductor in response to a temperature at or near the point of protection exceeding a threshold temperature.
- the RF thermal fuses are positioned on the transmission line at intervals such that the RF thermal fuses provide a combined impedance that is sufficient to reflect a portion of the incident power of an RF signal in a predetermined frequency band from the RF signal source.
- Fig. 1 is a block diagram of an example RF thermal fuse positioned along a transmission line between a base station and an RF device according to one aspect.
- Fig. 2 is a cross-sectional side view of an irreversible RF thermal fuse positioned along a transmission line according to one aspect.
- Fig. 3 is a cross-sectional side view of the irreversible RF thermal fuse creating a short circuit in a transmission line according to one aspect.
- Fig. 4 is a block diagram of an alternative example RF thermal fuse positioned along a transmission line between a base station and an RF device according to one aspect.
- Fig. 5 is a cross-sectional side view of a reversible RF thermal fuse positioned along a transmission line according to one aspect.
- Fig. 6 is a cross-sectional side view of the reversible RF thermal fuse creating a short circuit in a transmission line according to one aspect.
- the protected RF device 106 being set to an "OFF" status can cease the electrical current to the coil, thereby causing the current to cease exerting an electro-magnetic force on the bolt 502.
- the spring can expand in response to the cessation of the electro-magnetic force, thereby causing the bolt to contact the protected transmission line 108.
- the thermal over-temperature protection fuse 1704 of the RF termination device 1702 can be coupled to the lead 1706a via a solder joint 1708.
- the shape of the thermal over-temperature protection fuse 1704 can cause a force to be exerted that opposes the force of a solder joint 1708 coupling the thermal over-temperature protection fuse 1704 to the lead 1706a.
- Current can flow and/or a signal can be communcated from the transmission line 108 to one or more RF device components 1712.
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Fuses (AREA)
Abstract
Description
- The present invention relates generally to telecommunications systems and more particularly (although not necessarily exclusively) to thermal fuses for preventing overheating of RF devices in a telecommunication system.
- The power of a signal received by a telecommunications device in a telecommunications system can cause the temperature of the telecommunications device to increase. A telecommunications device can include a cooling mechanism that can maintain the temperature of internal components of the telecommunications device such that the internal components are not damaged by heat. An example of a cooling mechanism can include a forced airflow provided by a cooling fan.
- A cooling mechanism such as a cooling fan can be powered by a power source in the telecommunications device. Deficiencies in the power source can cause power to cease being provided to the cooling mechanism. Deficiencies in the power source can include (but are not limited to) a defective power supply, a switching off of the power source, an over-current fuse trip, etc. The loss of power to the cooling mechanism can cause the RF termination device or other components of the telecommunications device to increase in temperature such that the components will be overstrained, defective, and/or dangerous to touch.
- Certain aspects and features of the present invention are directed to thermal fuses for preventing overheating of RF devices in a telecommunication system.
- In one aspect, an RF thermal fuse is provided. The RF thermal fuse includes a body, a conductive bolt, and a driving mechanism. The body can be positioned on a transmission line between an RF signal source and an RF device. The conductive bolt is positioned in the body. The conductive bolt has a length sufficient to provide impedance at a point of protection on the transmission line in response to the conductive bolt contacting a live conductor of the transmission line. The impedance is sufficient to reflect a portion of the incident power of an RF signal from the RF source. The driving mechanism can cause the conductive bolt to contact the live conductor in response to a temperature at or near the point of protection exceeding a threshold temperature.
- In another aspect, a thermal protection system is provided. The thermal protection system includes multiple RF fuses. Each RF fuse includes a body, a conductive bolt, and a driving mechanism. The body can be positioned on a transmission line between an RF signal source and an RF device. The conductive bolt is positioned in the body. The conductive bolt has a length sufficient to provide impedance at a point of protection on the transmission line in response to the conductive bolt contacting a live conductor of the transmission line. The driving mechanism can cause the conductive bolt to contact the live conductor in response to a temperature at or near the point of protection exceeding a threshold temperature. The RF thermal fuses are positioned on the transmission line at intervals such that the RF thermal fuses provide a combined impedance that is sufficient to reflect a portion of the incident power of an RF signal in a predetermined frequency band from the RF signal source.
- In another aspect, a system is provided. The system includes and RF device in communication with an RF signal source via a transmission line and an RF thermal fuse positioned on the transmission line. The RF thermal fuse includes a body, a conductive bolt, and a driving mechanism. The body can be positioned on the transmission line between the RF signal source and the RF device. The conductive bolt is positioned in the body. The conductive bolt has a length sufficient to provide impedance at a point of protection on the transmission line in response to the conductive bolt contacting a live conductor of the transmission line. The impedance is sufficient to reflect a portion of the incident power of an RF signal from the RF source. The driving mechanism can cause the conductive bolt to contact the live conductor in response to a temperature at or near the point of protection exceeding a threshold temperature.
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Fig. 1 is a block diagram of an example RF thermal fuse positioned along a transmission line between a base station and an RF device according to one aspect. -
Fig. 2 is a cross-sectional side view of an irreversible RF thermal fuse positioned along a transmission line according to one aspect. -
Fig. 3 is a cross-sectional side view of the irreversible RF thermal fuse creating a short circuit in a transmission line according to one aspect. -
Fig. 4 is a block diagram of an alternative example RF thermal fuse positioned along a transmission line between a base station and an RF device according to one aspect. -
Fig. 5 is a cross-sectional side view of a reversible RF thermal fuse positioned along a transmission line according to one aspect. -
Fig. 6 is a cross-sectional side view of the reversible RF thermal fuse creating a short circuit in a transmission line according to one aspect. -
Fig. 7 is a side view of a reversible RF thermal fuse with a steering ring according to one aspect. -
Fig. 8 is a cross-sectional side view of a reversible RF thermal fuse with a steering ring positioned along a transmission line according to one aspect. -
Fig. 9 is a cross-sectional side view of a reversible RF thermal fuse with a steering ring creating a short circuit in a transmission line according to one aspect. -
Fig. 10 is a cross-sectional side view of a reversible RF thermal fuse actuated by a bimetal driving mechanism positioned along a transmission line according to one aspect. -
Fig. 11 is a cross-sectional side view of a reversible RF thermal fuse actuated by a bimetal driving mechanism creating a short circuit in a transmission line according to one aspect. -
Fig. 12 is a cross-sectional side view of an electromagnetically actuated RF thermal fuse positioned along a transmission line according to one aspect. -
Fig. 13 is a cross-sectional side view of an electromagnetically actuated RF thermal fuse creating a short circuit in a transmission line according to one aspect. -
Fig. 14 is a cross-sectional side view of an RF thermal fuse actuated by an expandable gas that is positioned along a transmission line according to one aspect. -
Fig. 15 is a cross-sectional side view of an RF thermal fuse actuated by an expandable gas creating a short circuit in a transmission line according to one aspect. -
Fig. 16 is a block diagram of alternative example RF thermal fuse positioned along a transmission line between a base station and an RF device according to one aspect. -
Fig. 17 is a cross-sectional side view of an RF thermal fuse for creating an open circuit positioned along a transmission line according to one aspect. -
Fig. 18 is a cross-sectional side view of an RF thermal fuse creating an open circuit positioned along a transmission line according to one aspect. -
Fig. 19 is a cross-sectional side view of cascaded RF thermal fuses for creating open circuits positioned along a transmission line according to one aspect. -
Fig. 20 is a cross-sectional side view of cascaded RF thermal fuses creating open circuits in a transmission line according to one aspect. -
Fig. 21 is a block diagram of alternative example RF thermal fuse positioned along a transmission line between a base station and an RF device according to one aspect. -
Fig. 22 is a cross-sectional side view of an RF thermal fuse having a dielectric material and positioned along a transmission line according to one aspect. -
Fig. 23 is a cross-sectional side view of an RF thermal fuse having a dielectric material creating an open circuit in a transmission line according to one aspect. -
Fig. 24 is a cross-sectional side view of cascaded RF thermal fuses having dielectric materials and positioned along a transmission line according to one aspect. -
Fig. 25 is a cross-sectional side view of cascaed RF thermal fuses having dielectric material creating open circuits in a transmission line according to one aspect. -
Fig. 26 is a block diagram of an RF device including an RF termination device and in communication with a base station via a transmission line according to one aspect. -
Fig. 27 is a perspective view of an RF termination device according to one aspect. -
Fig. 28 is a cross-sectional side view of an RF termination device having a thermal over-temperature protection fuse according to one aspect. -
Fig. 29 is a cross-sectional side view of a thermal over-temperature protection fuse for an RF termination device creating an open circuit according to one aspect. -
Fig. 30 is a cross-sectional side view of an RF termination device having a thermal over-temperature protection fuse configured to provide a single pole change over function according to one aspect. -
Fig. 31 is a cross-sectional side view of an RF termination device having a thermal over-temperature protection fuse configured to provide a single pole change over function according to one aspect. - Certain aspects and examples are directed to RF thermal fuses for preventing overheating of an RF device receiving signals from a base station or other RF signal source.
- In accordance with some aspects, an RF thermal fuse can include a body, a conductive bolt, and a driving mechanism. The body can be positioned on a transmission line, such as a coaxial cable, between an RF signal source, such as a base station, and an RF device, such as an antenna unit. The bolt can be formed from or otherwise include a conductive material. The bolt can be positioned in the body. The bolt can have a length sufficient to provide an impedance at the point of protection in response to the bolt contacting a "live" conductor of the transmission line that carries RF signals, such as (but not limited to) the inner conductor of a coaxial cable. The impedance can be sufficient to reflect at least a portion of the incident power of an RF signal from the RF signal source. The incident power or portion thereof that is reflected back to the RF signal source can be sufficient to cause the RF signal source to cease providing RF signals to an RF device protected using the RF thermal fuse. The driving mechanism can cause the bolt to contact the conductor in response to a temperature of the conductor exceeding a threshold temperature.
- The RF thermal fuse can be positioned at a protection point of the transmission line via which RF signals are transmitted to the protected RF device. For example, the RF thermal fuse can be mounted on the outer conductor of a coaxial cable used as a transmission line. A base station or other RF signal source can transmit RF signals to the protected RF device via the transmission line. A non-limiting example of a protected RF device is a point-of-interface connecting a base station to a distributed antenna system or other telecommunication system. Other non-limiting examples of a protected device include devices that use active cooling, such as dummy loads, attenuators, or other devices. Active cooling systems may include cooling systems that require external power such as fans. Devices that use active cooling may be damaged if exposed to incident RF power via the transmission line without active cooling and/or other proper cooling methods. The RF thermal fuse can reflect most or all of the incident power from an RF signal back to an RF signal source (e.g., a base station) in response to the temperature at or near the protection point exceeding the critical temperature of the device.
- In additional or alternative aspects, the RF thermal fuse can reflect most or all of the incident power from an RF signal back to the RF signal source in response to the protected RF device being set to an "OFF" status. For example, a power source that supplies DC power to the RF device can be turned off. An RF signal source may continue to transmit RF signals to the RF device after the power source is turned off. Continuing to transmit RF signals to the RF device after the power source is turned off can cause the RF device to overheat. The RF thermal fuse can reflect incident power from an RF signal back to the RF signal source in response to the power source being turned off, thereby notifying the RF signal source that it should cease transmitting RF signals to the RF device.
- As used herein, the term "'OFF' status" is used to refer to a state for an RF device in which the RF device does not transmit or receive RF signals.
- As used herein, the term "'ON' status" is used to refer to a state for an RF device in which the RF device transmits or receives RF signals.
- The RF thermal fuse can provide high impedance at the protection point during standard operation of the protected RF device. As used herein, the term "standard operation" is used to refer to an operational state in which the RF device being in an "ON" status in which the RF device can receive and/or transmit RF signals. The RF thermal fuse can provide low impedance at the protection point in response to the temperature at or near the protection point exceeding the critical temperature such that most of incident power is reflected towards the RF signal source. The temperature at or near the protection point can be measured by a temperature sensor.
- In some aspects, the RF thermal fuse can include a switching mechanism positioned at the end of a stub. The stub can be connected in parallel to the protected transmission line at the protection point. The stub can physically separate a switching point and a protection point. The stub can have a length of N x λ / 4, where N is an integer and λ is the wavelength of an RF signal at an operating frequency. The operating frequency can be a frequency of an RF signal transmitted by a base station or other RF signal source via the transmission line. An even value of N can provide an open-circuited stub in standard operation. An odd value of N can provide a short-circuited stub such that performance in the transmission line is not affected during standard operation.
- In additional aspects, the RF thermal fuse can be positioned such that the RF thermal fuse provides a short circuit within a close vicinity of the protection point (i.e., N = 0). For example, an RF thermal fuse can provide a short circuit within a close vicinity of the protection point in response to the protected RF device being in an "OFF" status.
- In some aspects, the RF thermal fuse can be irreversible. An irreversible RF thermal fuse can be replaced after the single overheating event. In other aspects, the RF thermal fuse can be reversible. For example, after each overheating event, the bolt of a reversible RF thermal fuse can re-set to a position that does not affect the transmission of RF signals along the protected transmission line.
- As used herein, the term "irreversible" is used to refer to an RF thermal fuse being used to protect the RF device in response to a single overheating event, where the RF thermal fuse is replaced after the overheating event.
- As used herein, the term "reversible" is used to refer to an RF thermal fuse being used to protect the RF device in response to multiple overheating events, where the RF thermal fuse is re-set after each overheating event.
- In additional or alternative aspects, the RF device can include one or more thermal over-temperature protection fuses. The thermal over-temperature protection fuse can cause an RF signal path that includes the transmission line and the RF device to open. Opening the signal path can interrupt electrical current, such as the current caused by a signal communicated from a base station or other RF signal source to the RF device, from flowing through the signal path. Interrupting the electrical current can prevent the base station or other RF signal source from providing RF power to the RF device. Preventing the base station or other telecommunications device from providing RF power to the RF device can prevent components of the RF device from overheating.
- Detailed descriptions of these aspects and examples are discussed below. These illustrative examples are given to introduce the reader to the general subject matter discussed here and are not intended to limit the scope of the disclosed concepts. The following sections describe various additional aspects and examples with reference to the drawings in which like numerals indicate like elements, and directional descriptions are used to describe the illustrative examples but, like the illustrative examples, should not be used to limit the present invention.
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Figs. 1-3 depict an example irreversible RFthermal fuse 102 that can be used to protect RF devices from over-heating in a telecommunication system. -
Fig. 1 is a block diagram depicting an RFthermal fuse 102 positioned along atransmission line 108 between abase station 104 and anRF device 106. Atransmission line 108 can include any suitable transmission medium for electrically communicating signals between an RF signal source, such as abase station 104, and a protectedRF device 106. Non-limiting examples of a protectedRF device 106 include a remote antenna unit, a point-of-interface device connecting abase station 104 to a distributed antenna system or other telecommunication system, and the like. -
Fig. 2 is a cross-sectional side view of a RFthermal fuse 102 positioned along thetransmission line 108 at aprotection point 202. The RFthermal fuse 102 can include abolt 206, abody 208, aspring 210, and anadjustment screw 214. Thebolt 206, thespring 210, and theadjustment screw 214 can be disposed in thebody 208. Thebolt 206 can be formed from or otherwise include a conductive material, such as (but not limited to) copper. Thebody 208 can be formed from any suitable rigid non-conductive material, such as (but not limited to) plastic. Thespring 210 can be an expansion spring adapted to exert a force against thebolt 206 in a direction of aconductor 204 of thetransmission line 108. - A
solder 212 can be applied to thebolt 206 to maintain thebolt 206 in a position that does not contact theconductor 204. Thesolder 212 can exert a force resisting the force exerted by thespring 210. Thesolder 212 can include a metal or other soldering material having a melting temperature that is less than or equal to a threshold temperature. The threshold temperature can be indicative of overheating in thetransmission line 108. A non-limiting example of a melting temperature is 95-100 degrees Celsius. - The RF
thermal fuse 102 can be positioned to such that the protectedtransmission line 108 is short-circuited at theprotection point 202 in response to an overheating event. A temperature at or near the RFthermal fuse 102 that exceeds the threshold temperature can cause the soldering material of thesolder 212 to melt. Melting thesolder 212 can reduce or cease resistance of the force exerted by thespring 210. Reducing or ceasing resistance to the force exerted by thespring 210 can cause thebolt 206 to move toward theconductor 204 of the protectedtransmission line 108, as depicted by the downward arrow inFig. 3 . - The
bolt 206 can make a connection with theconductor 204 of thetransmission line 108. The connection with thetransmission line 108 can be a galvanic connection allowing the flow of current through thebolt 206. The connection can provide a low impedance ZL in parallel to the protectedtransmission line 108 at theprotection point 202. The value of the impedance ZL can be determined by the distance d of the short-circuit position from the protection point, as represented by the equation
where Z0 is the characteristic impedance of the stub and Θ is an electrical length corresponding to the distance d between a physical position of the short circuit and theprotection point 202. - An RF signal from a
base station 104 or other signal source can encounter the impedance ZL . Encountering the impedance ZL can cause a portion of incident power from the RF signal to be reflected back to thebase station 104 or other signal source. Thebase station 104 or other RF signal source can receive the reflected RF signal. Thebase station 104 or other signal source can determine that the reflected incident power is sufficiently large that no additional RF signals are to be transmitted to the protectedRF device 106. Thebase station 104 or other signal source ceasing to transmit RF signal can thereby protect the protectedRF device 106 from additional warming. - The solution depicted in
Figs. 1-3 can be used, for example, in applications in which the distance d between a physical position of the short-circuit and theprotection point 202 is sufficiently small compared to λ/4 at the operating frequency, such as for operating frequencies from DC to a few GHz. The protectedRF device 106 can be returned to operation by replacing the melted RFthermal fuse 102 with a new RF thermal fuse. - In other aspects, the RF thermal fuse can be reversible, as depicted in
Figs. 4-6. Fig. 4 is a block diagram depicting an RFthermal fuse 402 positioned along atransmission line 108 between abase station 104 and anRF device 106.Fig. 5 is a cross-sectional side view of a RFthermal fuse 402 positioned along thetransmission line 108 at aprotection point 501. The RFthermal fuse 402 includes abolt 502 and abody 504. Thebolt 502 can be disposed in thebody 504. Thebolt 502 can be formed from or otherwise include a conductive material. For the protectedRF device 106 being in an "ON" status, thebolt 502 being positioned in thebody 504 can prevent thebolt 502 from influencing transmission of RF signals from abase station 104 or other RF signal source to the protectedRF device 106, as depicted inFig. 5 . For the protected RF device being in an "OFF" status, thebolt 502 can move toward theconductor 204, as depicted by the downward arrow inFig. 6 . Thebolt 502 contact theconductor 204 to generate a short circuit, thereby providing a low-impedance connection to theprotection point 501. - The RF
thermal fuse 402 for N = 0 can be used at low RF frequencies wherein the distance d between the physical position of a short-circuit provided by the RFthermal fuse 402 and the point of protection (as depicted inFig. 6 ) is smaller than λ / 4 at the operating frequency. - In additional or alternative aspects, an RF
thermal fuse 402 can be modified to increase the operating frequency band, as depicted inFigs. 7-9 . The operating frequency band can be increased by using an RF thermal fuse having aspring 702 and ametallic steering ring 704, as depicted by the lateral side view of thebolt 502 inFig. 7 . Thespring 702 and ametallic steering ring 704 can be disposed in thebody 504, as depicted by the cross-sectional side view of the RF thermal fuse 402'Fig. 8 . Thespring 702 can exert a force causing thebolt 502 to contact theconductor 204 and create a short circuit, as depicted by the downward arrow inFig. 9 . Themetallic steering ring 704 can shorten the distance d of the short circuit such that the distance d is the distance from theprotection point 701 to themetallic steering ring 704. Shortening the distance d can allow the RF thermal fuse 402' to reflect incident power from higher frequency signals. - The position of the
bolt 502 can be driven by any suitable driving mechanism. In some aspects, a reversible RFthermal fuse 402 can include a temperature-sensitive driving mechanism to position thebolt 502. Non-limiting examples of a suitable driving mechanism include bimetal, a shape memory alloy ("SMA") spring, air pressure, wax, liquid, relay, etc. with an appropriate spring/anchor mechanism. - For example,
Figs. 10-11 depict an RFthermal fuse 402" having abimetal driving mechanism 706. In standard operation, as depicted inFig. 10 , thebimetal driving mechanism 706 can exert a force that resists a force exerted by thespring 702. A temperature exceeding a threshold temperature can allow thebimetal driving mechanism 706 to lengthen, as depicted inFig. 11 . Lengthening thebimetal driving mechanism 706 can reduce or remove the force resisting the force exerted by thespring 702. Reducing or removing the force resisting the force exerted by thespring 702 can allow thespring 702 to contract. Contracting thespring 702 can cause thebolt 502 to move toward theconductor 204 of thetransmission line 108, as depicted by the downward arrow inFig. 11 . - In other aspects, a reversible RF
thermal fuse 402 can be electromagnetically actuated to position thebolt 502.Figs. 12-13 depict an RF thermal fuse 402'" that is electromagnetically actuated via anactuation coil 708 and aDC power source 710. A non-limiting example of aDC power source 710 is a power source of a protectedRF device 106. In standard operation, as depicted inFig. 12 , theDC power source 710 can provide power creating an electromagnetic field through theactuation coil 708. The electromagnetic field through theactuation coil 708 can resist a force exerted by thespring 702. TheDC power source 710 ceasing to provide power to theactuation coil 708 can reduce or eliminate the magnetic field resisting the force exerted by thespring 702. For example, theDC power source 710 may cease providing power in response to the protectedRF device 106 being set to an "OFF" status. Ceasing resistance to the force exerted by thespring 702 can allow thespring 702 to contract. Contracting thespring 702 can cause thebolt 502 to move toward theconductor 204 of thetransmission line 108, as depicted by the downward arrow inFig. 13 . - In additional or alternative aspects, a reversible RF
thermal fuse 402 can include other driving mechanisms to position thebolt 502. For example, a driving mechanism can include a coil and an expansion spring for spring loading thebolt 502. The protectedRF device 106 in an "ON" status can supply an electrical current to the coil, thereby causing the coil to exert an electro-magnetic force on the bolt. The electro-magnetic force on the bolt can move the bolt away from the protection point such that the bolt does not influence the transmission of RF signals along the protectedtransmission line 108. Moving the bolt away from the protection point can compress an expansion spring adjacent to thebolt 502 and adapted to exert a force against thebolt 502 in the direction of theconductor 204. The protectedRF device 106 being set to an "OFF" status can cease the electrical current to the coil, thereby causing the current to cease exerting an electro-magnetic force on thebolt 502. The spring can expand in response to the cessation of the electro-magnetic force, thereby causing the bolt to contact the protectedtransmission line 108. - In other aspects, a reversible RF
thermal fuse 402 can be actuated via an expandable gas to position thebolt 502.Figs. 14-15 depict an RFthermal fuse 402"" that is actuated via anexpandable gas 712 contained in achamber 714. In standard operation, as depicted inFig. 14 , thegas 712 can have an amount of pressure that is sufficiently low that a force applied to thebolt 502 in response to the pressure of thegas 712 is less than a force exerted by aspring 716. The force can be exerted by aspring 716 against thebolt 502 in a direction away from theconductor 204, as depicted by the upward arrow inFig. 14 . Thegas 712 can expand in response to a temperature at or near the RFthermal fuse 402"" exceeding a threshold temperature. The threshold temperature can be a temperature that is indicative of an overheating event. The expansion of thegas 712 can apply a sufficient pressure to thebolt 502 that thespring 716 is compressed and thebolt 502 is moved toward theconductor 204 of thetransmission line 108, as depicted by the downward arrow inFig. 15 . A cessation or absence of the overheating event can allow thegas 712 to contract. The contraction of thegas 712 can reduce pressure applied to thebolt 502 such that that thespring 716 expands and thebolt 502 is moved away from theconductor 204 of thetransmission line 108. Thebolt 502 moving away from theconductor 204 of thetransmission line 108 can return the bolt to the position depicted inFig. 14 . In additional or alternative aspects, thespring 716 can be omitted. Thebolt 502 can be manually reset to the position depicted inFig. 14 by a technician or other user. - For higher frequencies at which an impedance at the protection point can be too high, an RF thermal fuse having a λ/4 stub (d = λ/4) can be used, as depicted in
Figs. 16-18. Fig. 16 is a block diagram depicting an RFthermal fuse 902 positioned along atransmission line 108 between abase station 104 and anRF device 106.Fig. 17 is a cross-sectional side view of the RFthermal fuse 902 positioned along thetransmission line 108 at aprotection point 1001. The RFthermal fuse 902 can include abolt 1002, astub 1003, and abody 1004. Thebolt 1002 and thestub 1003 can be disposed in thebody 1004. Thebolt 1002 and thestub 1003 can be formed from or otherwise include a conductive material, such as (but not limited to) copper. Thebolt 1002 and thestub 1003 can be coupled or otherwise attached together via any suitable method providing an electrical path from thebolt 1002 through thestub 1003, such as (but not limited to) soldering thebolt 1002 to thestub 1003. - Standard operation of the protected
RF device 106 can involve the RFthermal fuse 902 being short-circuited, as depicted inFig. 17 . A temperature at or near theprotection point 1001 exceeding a threshold temperature can cause the RFthermal fuse 902 to provide an open circuit. The open circuit can be provided by the separation of thebolt 1002 and thestub 1003, as depicted by the upward arrow inFig. 18 . In some aspects, the RFthermal fuse 902 can be irreversible. For example, soldering thebolt 1002 to thestub 1003 can cause the RFthermal fuse 902 to be irreversible. - In some aspects, the
stub 1003 can have a length of λ/4 stub. In other aspects, a longer stub 1003 (N ≥ 2) can be used. A switching function of the RF thermal fuse can provide an open circuit at the protection point in standard operation. The switching function of the RF thermal fuse can provide a short circuit when protected. The bandwidth of operation can decrease as the value of N increases. - A wider operating frequency band of the RF thermal fuse may be required at higher RF frequencies of RF signals transmitted by the
base station 104 or another RF signal source. A wider operating frequency band can be obtained by cascading more than one RFthermal fuse 902. For example,Fig. 19 is a cross-sectional side view of RFthermal fuses protection points transmission line 108 during standard operation. The RFthermal fuses bolts stubs bodies -
Fig. 20 is a cross-sectional side view of the RFthermal fuses protection points transmission line 108. The open circuits in thetransmission line 108 can be created by disconnecting thebolts stubs Fig. 20 . Each of the RFthermal fuses stubs thermal fuse 902a has thestub 1003a with a length dstub, a that is different from the length dstub, b of thestub 1003b for thethermal fuse 902b. The cascaded RFthermal fuses thermal fuses RF device 106 receiving RF signals. - Another non-limiting example of an RF thermal fuse having a reversible function at higher frequencies is depicted in
Figs. 21-23. Fig. 21 is a block diagram depicting an RFthermal fuse 1302 positioned along atransmission line 108 between abase station 104 and anRF device 106.Fig. 22 is a cross-sectional side view of a RFthermal fuse 1302 positioned along thetransmission line 108 at aprotection point 1401. The RFthermal fuse 1302 includes abolt 1402, abolt extender 1403, abody 1404, and adielectric material 1406. Thebolt 1402, thebolt extender 1403, and thedielectric material 1406 can be disposed in thebody 1404. Thedielectric material 1406 can be positioned between thebolt 1402 and thebolt extender 1403. For the protected RF device being in an "ON" status,bolt 1402, thebolt extender 1403 and thedielectric material 1406 can be positioned such that the transmission of RF signals from abase station 104 or other RF signal source to the protectedRF device 106 is not affected. Thebolt 1402, thebolt extender 1403 and thedielectric material 1406 can be shifted towards theconductor 204 in response to the temperature at theprotection point 1401 exceeding a threshold temperature, as depicted by the downward arrow inFig. 23 . Thebolt 1402 can contact theconductor 204. Thebolt 1402 contacting theconductor 204 can cause a short circuit from theprotection point 1401 to an open-circuit provided by thedielectric material 1406. The short circuit from theprotection point 1401 to an open-circuit can have a length of λ/4 at the operating frequency of the transmitted RF signal. - A wider operating frequency band of the RF thermal fuse may be required at higher RF frequencies. A wider operating frequency band can be obtained by cascading more than one RF
thermal fuse 1302, as depicted inFigs. 24-25. Fig. 24 is a cross-sectional side view of the RFthermal fuses protection points thermal fuses bolts bolt extenders dielectric materials bodies Fig. 25 is a cross-sectional side view of the RFthermal fuses protection points transmission line 108. The short circuits in thetransmission line 108 can be created by thebolts conductor 204 of thetransmission line 108, as depicted by the downward arrows inFig. 25 . Each of the RFthermal fuses Fig. 25 , thethermal fuse 1302a has thebolt 1402a with a length dbolt, a that is different from the length dbolt, b of thebolt 1402b for thethermal fuse 1302b. The cascaded RFthermal fuses thermal fuses RF device 106 receiving RF signals. - In additional or alternative aspects, additional protection from overheating can be provided by a thermal over-temperature protection fuse for an RF termination device in a telecommunications system. A thermal over-temperature protection fuse can cause a signal path in a telecommunications system, such as an RF signal path, to open. Opening the signal path can interrupt electrical current, such as the current caused by a signal communicated from a base station or other telecommunications device, from flowing through the signal path. Interrupting the electrical current can prevent the
base station 104 or other signal source from providing RF power to an RF termination device that includes the thermal over-temperature protection fuse. - For example, an RF termination device may be included in a protected
RF device 106.Fig. 26 is a block diagram of theRF device 106 that includes anRF termination device 1502. A non-limiting example of anRF device 106 is a base station router or other a point-of-interface system or device. TheRF device 106 can include a splitter/combiner module 1501 in which theRF termination device 1502 is disposed. TheRF termination device 1502 can prevent thebase station 104 and/or another RF signal source from providing RF power to theRF device 106. Preventing thebase station 104 or other RF signal source from providing RF power to the RF termination device can prevent overheating of components of the protectedRF device 106. -
Fig. 27 is a perspective view of an exampleRF termination device 1502. AnRF termination device 1502, such as the flange mount termination device depicted inFig. 27 , can include alead 1504. An example of a flange mount termination device is a K100N50X4 half flange termination device. TheRF termination device 1502 can receive power from abase station 104 or other telecommunications device, such as theRF device 106 via thelead 1504. Thelead 1504 can be formed from any suitable conductive material, such as (but not limited to) copper or a copper alloy. -
Fig. 28 depicts an example of anRF termination device 1602 having a thermalover-temperature protection fuse 1604. TheRF termination device 1602 can be coupled to a lead of a printedcircuit board 1606 via the thermalover-temperature protection fuse 1604 or otherwise coupled to a component of a telecommunications device via the thermalover-temperature protection fuse 1604. The thermalover-temperature protection fuse 1604 can be coupled to a lead of the printedcircuit board 1606 via asolder joint 1608. - The thermal
over-temperature protection fuse 1604 can be coupled to a component of a telecommunications device such that a tension of the thermalover-temperature protection fuse 1604 exerts a force. The force exerted by the tension of the thermalover-temperature protection fuse 1604 can oppose a force exerted by the coupling of the thermalover-temperature protection fuse 1604 to the printedcircuit board 1606. For example, as depicted inFig. 28 , the thermalover-temperature protection fuse 1604 can have a curved shape such that the thermalover-temperature protection fuse 1604 has a spring function. The thermalover-temperature protection fuse 1604 can be coupled to the printedcircuit board 1606 via asolder joint 1608. The curved shape of the thermalover-temperature protection fuse 1604 can cause a force to be exerted that opposes the force of the solder joint 1608 coupling the thermalover-temperature protection fuse 1604 to the printedcircuit board 1606. - Ceasing the force exerted by the solder joint 1608 can cause the thermal
over-temperature protection fuse 1604 to cease contacting the printedcircuit board 1606, thereby opening the signal path terminated by theRF termination device 1602. Ceasing the forced exerted by the solder joint 1608 can be caused by, for example, the printedcircuit board 1606 having a temperature sufficient to cause the solder joint 1608 to melt. For example,Fig. 29 depicts theRF termination device 1602 having a thermalover-temperature protection fuse 1604 that ceases contacting the printedcircuit board 1606. The printedcircuit board 1606 can have a sufficiently high temperature that the solder joint 1608 melts, thereby removing the force exerted by thesolder joint 1608. The force caused by the shape of the thermalover-temperature protection fuse 1604 can cause the thermalover-temperature protection fuse 1604 to cease contacting the printedcircuit board 1606, thereby opening the signal path in which the printedcircuit board 1606 is disposed. - The
base station 104 or other RF signal source can provide a signal to a signal path that is opened by the thermalover-temperature protection fuse 1604. The opening of the signal path by the thermalover-temperature protection fuse 1604 can cause the signal path to lack a termination mechanism. The un-terminated signal path can cause a signal provided by thebase station 104 or other RF signal source to reflect back to thebase station 104 or other RF signal source. The signal reflecting back to thebase station 104 or other RF signal source can cause thebase station 104 or other RF signal source to cease providing signals to the signal path that is opened by the thermalover-temperature protection fuse 1604. For example, abase station 104 receiving a reflected signal may be configured to terminate operation in response to receiving the reflected signal. - The thermal
over-temperature protection fuse 1604 can be formed from a conductive material. The conductive material can have a strength sufficient that the thermalover-temperature protection fuse 1604 is not broken or otherwise damaged by the force opposing the force of thesolder joint 1608. An example of such a conductive material can include, but is not limited to, beryllium copper. Other examples include copper alloys. Such copper alloys can include copper, which provides a conductive property, and one or more additional elements, which provide sufficient durability to prevent the thermalover-temperature protection fuse 1604 from being broken or otherwise damaged by the force opposing the force of thesolder joint 1608. - Although the thermal
over-temperature protection fuse 1604 is depicted inFigs. 28 and 29 as having a curved shape, other implementations are possible. For example, the thermalover-temperature protection fuse 1604 can have a flat shape and be oriented at an angle away from the printedcircuit board 1606 or other component of the telecommunications device. The thermalover-temperature protection fuse 1604 can be coupled to the printedcircuit board 1606 or other component by exerting a force against the thermalover-temperature protection fuse 1604. The exerted force can cause the thermalover-temperature protection fuse 1604 to contact the printedcircuit board 1606 or other component. The force can be exerted or otherwise caused by, for example, the solder joint 1608 retaining the thermalover-temperature protection fuse 1604 in a position contacting the printedcircuit board 1606. The thermalover-temperature protection fuse 1604 can be formed from a material having a tension resisting the force exerted by thesolder joint 1608. In the absence of the force exerted by the solder joint 1608, the thermalover-temperature protection fuse 1604 can return to an original orientation angle at which the thermalover-temperature protection fuse 1604 does not contact the printedcircuit board 1606. - The solder joint 1608 can be formed from any conductive material having a sufficiently low melting point. For example, components of a telecommunications device may be capable of operating at temperatures up to 150 degrees Celsius. The performance of the components may be degraded or disrupted by temperatures in the range of 150 degrees Celsius to 250 degrees Celsius. A solder joint 1608 can be formed from a conductive material having a melting point in the range of 150 degrees Celsius to 250 degrees Celsius. A solder joint 1608 can be formed from a conductive material having a melting point exceeding 250 degrees Celsius. One example of a material from which the solder joint 1608 can be formed is Wood's metal. The solder joint 1608 can be soldered by hand or by machine.
- In some aspects, the conductive material for the solder joint 1608 can have a melting point at a threshold temperature that is the same threshold temperature as the RF
thermal fuse 102 positioned along thetransmission line 108. In other aspects, the conductive material for the solder joint 1608 can have a melting point at a threshold temperature that is a different threshold temperature than the RFthermal fuse 102. - In additional or alternative aspects, the thermal over-temperature protection fuse can be configured to provide a single pole changeover switching function. For example, as depicted in
Figs. 30-31 , anRF termination device 1702 having a thermalover-temperature protection fuse 1704 can provide a single pole changeover switching function betweenleads lead 1706a can be electrically connected to one or moreRF device components 1712. Thelead 1706b can be electrically connected to analert device 1710. A non-limiting example of analert device 1710 can include a transmitting device configured to transmit an alarm or other message in response to current flowing to the transmitting device or a signal being communicated to the transmitting device. In some aspects, thealert device 1710 can be coupled to thetransmission line 108 and can communicate the alarm or other message via thetransmission line 108, as depicted inFig. 30 . In other aspects, thealert device 1710 can include a wireless transmitting device configured to wirelessly broadcast or otherwise transmit the alarm or other message. - In normal operation, the thermal
over-temperature protection fuse 1704 of theRF termination device 1702 can be coupled to thelead 1706a via asolder joint 1708. The shape of the thermalover-temperature protection fuse 1704 can cause a force to be exerted that opposes the force of a solder joint 1708 coupling the thermalover-temperature protection fuse 1704 to thelead 1706a. Current can flow and/or a signal can be communcated from thetransmission line 108 to one or moreRF device components 1712. - An overheating event can cause the
lead 1706a to have a sufficiently high temperature that the solder joint 1708 melts. Thelead 1706a having a temperature sufficient to cause the solder joint 1708 to melt can cause the forced exerted by the solder joint 1708 to cease. Ceasing the force exerted by the solder joint 1708 can cause the thermalover-temperature protection fuse 1704 to cease contacting thelead 1706a. The force caused by the shape of the thermalover-temperature protection fuse 1704 can cause the thermalover-temperature protection fuse 1704 to contact thelead 1706b, as depicted by the upward arrow inFig. 31 . The thermalover-temperature protection fuse 1704 contacting thelead 1706b can allow current to flow to thealert device 1710 and/or a signal from thetransmission line 108 to be communicated to thealert device 1710. Current flowing to thealert device 1710 and/or a signal being communicated to thealert device 1710 can trigger an alert message from thealert device 1710 that an overheating condition has occurred. The alert from thealert device 1710 can identify the position of theRF termination device 1702 and identify that the thermalover-temperature protection fuse 1704 has switched from normal operation. - Although
Figs. 30-31 depict a singleRF termination device 1702, a single thermalover-temperature protection fuse 1704, and asingle alert device 1710, other implementations are possible. In additional or alternative aspects,multiple alert devices 1710 for multipleRF termination devices 1702 can be used to identify that multiple overheating events have occurred at multiple positions in anRF device 106 and/or in a telecommunication system havingmultiple RF devices 106. - The foregoing description of aspects and features of the invention, including illustrated examples, has been presented only for the purpose of illustration and description and is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Numerous modifications, adaptations, and uses thereof will be apparent to those skilled in the art without departing from the scope of this invention. Aspects and features from each example disclosed can be combined with any other example. The illustrative examples described above are given to introduce the reader to the general subject matter discussed here and are not intended to limit the scope of the disclosed concepts.
Claims (15)
- An RF thermal fuse comprising:a body adapted to be positioned on a transmission line between an RF signal source and an RF device;a conductive bolt positioned in the body, the conductive bolt having a length sufficient to provide an impedance at a point of protection on the transmission line in response to the conductive bolt contacting a live conductor of the transmission line, wherein the impedance is configured to reflect a portion of the incident power of an RF signal from the RF signal source; anda diiving mechanism configured to cause the conductive bolt to contact the live conductor in response to a temperature at or near the point of protection exceeding a threshold temperature.
- The RF thermal fuse of claim 1, wherein the driving mechanism is irreversible.
- The RF thermal fuse of claim 2, wherein the driving mechanism comprises:a spring adapted to apply a force to the conductive bolt in a direction toward the live conductor; anda solder adapted to resist the force applied to the conductive bolt, wherein the solder comprises a soldering material having a melting temperature equal to the threshold temperature.
- The RF thermal fuse of claim 1, wherein the driving mechanism is reversible.
- The RF thermal fuse of claim 4, wherein the driving mechanism comprises a bimetal driving mechanism.
- The RF thermal fuse of claim 4, wherein the driving mechanism comprises a chamber enclosing a gas or liquid, wherein the gas or the liquid is expandable such that the gas or the liquid applies pressure to the conductive bolt in response to the threshold temperature.
- The RF thermal fuse of claim 4, wherein the driving mechanism comprises an electromagnet configured to oppose a force applied by a spring to the conductive bolt in a direction toward the live conductor, the electromagnet configured to oppose the force in response to the electromagnet receiving a current from the RF device.
- The RF thermal fuse of claim 4, wherein the driving mechanism comprises a shape memory alloy spring mechanism.
- The RF thermal fuse of claim 1, further comprising a dielectric material positioned at a first end of the conductive bolt opposite a second end of the conductive bolt adapted to contact the live conductor.
- A thermal protection system comprising:a plurality of RF thermal fuses, each RF thermal fuse comprising:a body adapted to be positioned on a transmission line between an RF signal source and an RF device;a conductive bolt positioned in the body, the conductive bolt having a length sufficient to provide an impedance at a point of protection on the transmission line in response to the conductive bolt contacting a live conductor of the transmission line; anda driving mechanism configured to cause the conductive bolt to contact the live conductor in response to a temperature at or near the point of protection exceeding a threshold temperature;wherein the plurality of RF thermal fuses are positioned on the transmission line at intervals such that the plurality of RF thermal fuses provide a combined impedance that is adapted to reflect a portion of the incident power of an RF signal in a predetermined frequency band from the RF signal source.
- The thermal protection system of claim 10, wherein at least one of the plurality of RF thermal fuses is an RF thermal fuse according to one of the claims 1 to 9.
- The thermal protection system of claim 10, wherein, for at least one of the plurality of RF thermal fuses, the driving mechanism is irreversible or reversible.
- A system comprising:an RF device in communication with an RF signal source via a transmission line;an RF thermal fuse positioned on the transmission line, the RF thermal fuse comprising:a body adapted to be positioned on the transmission line between the RF signal source and the RF device;a conductive bolt positioned in the body, the conductive bolt having a length sufficient to provide an impedance at a point of protection on the transmission line in response to the conductive bolt contacting a live conductor of the transmission line, wherein the impedance is configured to reflect a portion of the incident power of an RF signal from the RF signal source; anda driving mechanism configured to cause the conductive bolt to contact the live conductor in response to a temperature at or near the point of protection exceeding a threshold temperature.
- The system of claim 13, wherein the RF device comprises a thermal over-temperature protection fuse coupled to at least one component of the RF device, wherein a signal path is provided from the transmission line to the thermal over-temperature protection fuse via the at least one component, wherein the thermal over-temperature protection fuse is configured to open the signal path in response to a temperature of the at least one component exceeding the threshold temperature.
- The system of claim 14, wherein the thermal over-temperature protection fuse comprises a soldering material adapted to electrically connect the thermal over-temperature protection fuse to the at least one component, wherein the soldering material has a melting temperature less than or equal to the threshold temperature.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15166240.0A EP2930733A1 (en) | 2012-10-09 | 2013-10-09 | Rf thermal fuse |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US201261711350P | 2012-10-09 | 2012-10-09 | |
US13/869,653 US9443683B2 (en) | 2012-04-24 | 2013-04-24 | RF thermal fuse |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
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EP15166240.0A Division EP2930733A1 (en) | 2012-10-09 | 2013-10-09 | Rf thermal fuse |
EP15166240.0A Division-Into EP2930733A1 (en) | 2012-10-09 | 2013-10-09 | Rf thermal fuse |
Publications (2)
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EP2720246A1 true EP2720246A1 (en) | 2014-04-16 |
EP2720246B1 EP2720246B1 (en) | 2015-07-08 |
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Family Applications (2)
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EP15166240.0A Withdrawn EP2930733A1 (en) | 2012-10-09 | 2013-10-09 | Rf thermal fuse |
EP13187898.5A Active EP2720246B1 (en) | 2012-10-09 | 2013-10-09 | RF thermal fuse |
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Application Number | Title | Priority Date | Filing Date |
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EP15166240.0A Withdrawn EP2930733A1 (en) | 2012-10-09 | 2013-10-09 | Rf thermal fuse |
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CN (1) | CN103715011B (en) |
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CL2016001392A1 (en) * | 2016-06-07 | 2016-12-30 | Infante Raúl Dominguez | Electrical disconnection protection device that acts in the presence of excessive current circulation that may occur in a coaxial cable that connects the decoficator with the antenna, which provides cable tv service in a residence |
CN110838396B (en) * | 2019-12-04 | 2022-05-20 | 湖南省安能电子有限公司 | Magnetic power-off fuse resistor |
CN111128595B (en) * | 2019-12-31 | 2022-06-07 | 宁波军鸽防务科技有限公司 | Control switch |
JP2024110141A (en) * | 2023-02-02 | 2024-08-15 | デクセリアルズ株式会社 | Protection Circuit |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2886744A (en) * | 1956-03-21 | 1959-05-12 | Jr William E Mcnatt | Electrical protective apparatus |
DE29605370U1 (en) * | 1996-03-22 | 1996-05-30 | Fritz Driescher KG Spezialfabrik für Elektrizitätswerksbedarf GmbH & Co, 41844 Wegberg | High voltage high power fuse |
JP2007089054A (en) * | 2005-09-26 | 2007-04-05 | Nippon Telegr & Teleph Corp <Ntt> | Antenna of rfid tag |
WO2007095873A1 (en) * | 2006-02-23 | 2007-08-30 | Siemens Aktiengesellschaft | Device for short-circuiting power semiconductor modules |
US20100073120A1 (en) * | 2007-03-26 | 2010-03-25 | Robert Bosch Gmbh | Thermal fuse for use in electric modules |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2126748Y (en) * | 1992-07-04 | 1993-02-03 | 陈明掌 | Plug-in sheet type fuse device |
-
2013
- 2013-10-09 CN CN201310465703.7A patent/CN103715011B/en active Active
- 2013-10-09 EP EP15166240.0A patent/EP2930733A1/en not_active Withdrawn
- 2013-10-09 EP EP13187898.5A patent/EP2720246B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2886744A (en) * | 1956-03-21 | 1959-05-12 | Jr William E Mcnatt | Electrical protective apparatus |
DE29605370U1 (en) * | 1996-03-22 | 1996-05-30 | Fritz Driescher KG Spezialfabrik für Elektrizitätswerksbedarf GmbH & Co, 41844 Wegberg | High voltage high power fuse |
JP2007089054A (en) * | 2005-09-26 | 2007-04-05 | Nippon Telegr & Teleph Corp <Ntt> | Antenna of rfid tag |
WO2007095873A1 (en) * | 2006-02-23 | 2007-08-30 | Siemens Aktiengesellschaft | Device for short-circuiting power semiconductor modules |
US20100073120A1 (en) * | 2007-03-26 | 2010-03-25 | Robert Bosch Gmbh | Thermal fuse for use in electric modules |
Also Published As
Publication number | Publication date |
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EP2930733A1 (en) | 2015-10-14 |
CN103715011B (en) | 2017-11-28 |
EP2720246B1 (en) | 2015-07-08 |
CN103715011A (en) | 2014-04-09 |
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