WO1999039419A1 - Lightning protection device for wired equipment - Google Patents

Lightning protection device for wired equipment Download PDF

Info

Publication number
WO1999039419A1
WO1999039419A1 PCT/IL1999/000054 IL9900054W WO9939419A1 WO 1999039419 A1 WO1999039419 A1 WO 1999039419A1 IL 9900054 W IL9900054 W IL 9900054W WO 9939419 A1 WO9939419 A1 WO 9939419A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
equipment
line
unit
energy
Prior art date
Application number
PCT/IL1999/000054
Other languages
French (fr)
Inventor
Omry Rotem
Original Assignee
Omry Rotem
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Omry Rotem filed Critical Omry Rotem
Priority to EP99901872A priority Critical patent/EP1058956A1/en
Priority to AU21831/99A priority patent/AU2183199A/en
Priority to CA002318876A priority patent/CA2318876A1/en
Publication of WO1999039419A1 publication Critical patent/WO1999039419A1/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/18Automatic or semi-automatic exchanges with means for reducing interference or noise; with means for reducing effects due to line faults with means for protecting lines
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01CRESISTORS
    • H01C7/00Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12Overvoltage protection resistors
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/738Interface circuits for coupling substations to external telephone lines
    • H04M1/74Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H04M1/745Protection devices or circuits for voltages surges on the line
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/22Arrangements for supervision, monitoring or testing
    • H04M3/2272Subscriber line supervision circuits, e.g. call detection circuits

Definitions

  • the present invention relates to a device adopted to prevent damage, caused by the phenomena of lightning, to electronic equipment connected to wires which are exposed to lightning and more particularly to Lightning Protection for wired equipment like Telephone Networks, Communication Network, TV Sets and other similar Equipment.
  • the common protections mostly use one or more of the following components:
  • the known protection device are "passive" and thus are all the time in the same mode of operation, regardless the status of the apparatus or device to be protected. It is thus the object of the present invention to provide a device which would provide better protection to the various networks.
  • the device according to the invention is intended to protect different kinds
  • the device comprises a housing in which are mounted in combination:
  • the device according to the invention is capable to protect all kinds of equipment with adaptation of the sensors and the switch.
  • the device operates in two or more distinctive usage types:
  • the IDLE line state At this state, the line is in a waiting state, for either a signal from the outside and connected equipment, or, by actuating the electronic device or lifting the hook of a telephone, for instance, before dialing.
  • the ACTIVE line state During this state the line of a telephone for instance, is ringing or unhooked and the user is waiting for the dial tone, is dialing, or is speaking.
  • the device comprises a signal input connection to the EMF surge protection unit, 1 , a protected output signal connection 2 from the EMF surge protection unit to the users at the protected
  • This logic unit adopted to evaluate the signal status or the signal usage status. This logic unit performs constant assessment of the signal status or usage status and pass the outcome to the logic of decision.
  • the unit is connected to Logic Unit 3 via 7.
  • the main switch 8 for galvanic connection / attenuation level change from the incoming signal and protected zone signal.
  • the nature of the devices at this area will be slow to moderate reaction speed but large energy absorbing level.
  • a Fast EMF energy absorbing devices 12 adopted to cut the energy level while the voltage is rising behind certain level, pass the excess energy to the earth.
  • the nature of the devices at this area will be fast reaction speed and accurate voltage trimming but small to moderate energy absorbing level.
  • a protection device power supply 14 The power source can be
  • This output is intended to indicate an external device about certain signal situations as signal disconnection or short circuit or level exceeding. Also it is possible to report to the protected zone about the probability of presence of an EMF noise, and the reflected risk level.
  • the type of protection in the present example in each state of the phone is intended to indicate an external device about certain signal situations as signal disconnection or short circuit or level exceeding. Also it is possible to report to the protected zone about the probability of presence of an EMF noise, and the reflected risk level.
  • INSULATION GALVANICALLY INSULATED OR ATTENUATED.
  • the phone line While the phone line is in the IDLE state i.e., the line is INACTIVE, the phone line
  • That INSULATION is carried out in the device.
  • the device must be located at any one of the following elements:
  • the protection device identifies the IDLE state of
  • the protecting device logic unit automatically
  • the equipment is protected by the LIMITATION concept or the
  • the above example refers to a device adopted to protect a telephone line
  • the sensors are adapted to the nature of the signal and its characteristics. The outcome of the sensor which defines the status is transferred to the logic unit which controls the operation of switch 8.

Abstract

A protecting device for electric and electronic devices and appliances is provided. The device includes a housing which is mounted in combination: a signal input connection to the EMF surge protection unit (1), a protected output signal connection (2) from the EMF surge protection unit to the users at the protected zone, a logic unit (3) of decision for the signal galvanic connection or attenuation level by a switch (8), an assess Logic unit (6) adopted to evaluate the signal status or the signal usage status, the switch (8) for galvanic connection/attenuation level change from the incoming signal and protected zone signal and logic unit for the assessment of the input signal, define the conditions to pass a request to change mode.

Description

LIGHTNING PROTECTION DEVICE FOR WIRED EQUIPMENT
FIELD OF THE INVENTION
The present invention relates to a device adopted to prevent damage, caused by the phenomena of lightning, to electronic equipment connected to wires which are exposed to lightning and more particularly to Lightning Protection for wired equipment like Telephone Networks, Communication Network, TV Sets and other similar Equipment.
BACKGROUND OF THE INVENTION
The natures of the telephone, computer communication networks and other wired equipment, which is connected to partly outdoor wires or networks of wires hang and spread all over, making it highly sensitive to the harm caused by the lightning phenomena. Because the lightning involves enormous levels of energy, the direct consequences are destroying the equipment, and in many cases it might cause burning of the equipment. Due to these hazards, the telephone communication equipment for example, always includes some kind of standard protection, defined by the Government Standard Institute, or local "PIT'.
The common protections mostly use one or more of the following components:
• Gas Tube Surge Arrestors
• Varistore protecting device
• Tamsorb and other Semiconductor protection devices
• Band Gap voltage limiters
• Coils and Chokes These devices are used and incorporated in the equipment are well known and need no further elaboration.
The problem of these protection devices and schemes, is that the level of the protection demonstrated by said devices are low, and even in case of an indirect lightning hit, the equipment suffers severe malfunctions and sometimes
total damage.
Furthermore, the known protection device are "passive" and thus are all the time in the same mode of operation, regardless the status of the apparatus or device to be protected. It is thus the object of the present invention to provide a device which would provide better protection to the various networks.
It is a further object of the present invention to provide "active" device which could distinguish between an "on" or "off1 or any operational mode of the electronic device it is adopted to protect.
SUMMARY OF THE INVENTION
The device according to the invention is intended to protect different kinds
of equipment, such as: Telephone equipment, or computer communication
network equipment, or other electronic or electric devices and appliances.
The device comprises a housing in which are mounted in combination:
a) A signal input connection to the EMF surge protection unit.
b) A protected output signal connection from the EMF surge protection
unit to the users at the protected zone.
c) A logic unit of decision for the signal galvanic connection or
attenuation level by a switch.
d) An assess Logic unit, adopted to evaluate the signal status or the
signal usage status.
e) A switch for galvanic connection / attenuation level change from the
incoming signal and protected zone signal.
f) A Logic Unit for the assessment of the input signal, define the
conditions to pass a request to change mode.
In a preferred embodiment the device further includes any or all of:
a) An optional sensor to sense the in-coming signal. This sensor can
be realized using a galvanically insulated sensing technique.
b) An optional sensor to sense the signal from the protected zone.
c) An optional input for request or conditional request for the operating
of said switch. a) Slow EMF energy absorbing devices. Cut the energy level while the voltage is rising beyond a certain level, pass the excess energy to the earth. e) Fast EMF energy absorbing devices. f) Devices of an inductive, resistive or capacitive nature. g) A protection device power supply. h) Optional signal and/or protection status output.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
The invention will now be described with reference to the annexed electric block diagram (Fig. 1) which is illustrated by way of example.
The device according to the invention is capable to protect all kinds of equipment with adaptation of the sensors and the switch. The device operates in two or more distinctive usage types:
I .The IDLE line state. At this state, the line is in a waiting state, for either a signal from the outside and connected equipment, or, by actuating the electronic device or lifting the hook of a telephone, for instance, before dialing. 2.The ACTIVE line state. During this state the line of a telephone for instance, is ringing or unhooked and the user is waiting for the dial tone, is dialing, or is speaking.
Turning to the block diagram the device comprises a signal input connection to the EMF surge protection unit, 1 , a protected output signal connection 2 from the EMF surge protection unit to the users at the protected
zone. A logic unit 3 of decision for the signal galvanic connection or attenuation
level by switch 8. An optional sensor 4 to sense the in coming signal. This sensor can be realized using a galvanically insulated sensing technique. A further optional sensor 5 to sense the signal from the protected zone. This sensor can
be realized using a galvanically insulated sensing technique. An assess Logic
unit 6, adopted to evaluate the signal status or the signal usage status. This logic unit performs constant assessment of the signal status or usage status and pass the outcome to the logic of decision.
The unit is connected to Logic Unit 3 via 7. The main switch 8 for galvanic connection / attenuation level change from the incoming signal and protected zone signal.
A further optional input 9 for request or conditional request for the
operating of said switch, which is connected to a Logic Unit 10 for the assessment of the input signal, define the conditions to pass a request to change status mode.
A Slow EMF energy absorbing devices 11 adopted to cut the energy level while the voltage is rising beyond a certain level, pass the excess energy to the earth. The nature of the devices at this area will be slow to moderate reaction speed but large energy absorbing level.
A Fast EMF energy absorbing devices 12 adopted to cut the energy level while the voltage is rising behind certain level, pass the excess energy to the earth. The nature of the devices at this area will be fast reaction speed and accurate voltage trimming but small to moderate energy absorbing level.
Devices of an inductive, resistive or capacitive nature 13. These devices
stop the flow of the EMF wave, and delay its speed from input 1 to output 2. The purpose of device 13 is to compensate the slow reaction speed of the devices denoted 11. A protection device power supply 14. The power source can be
external AC adapter or a battery or in some cases the signal itself.
An Optional signal and/or protection status output 15. This output is intended to indicate an external device about certain signal situations as signal disconnection or short circuit or level exceeding. Also it is possible to report to the protected zone about the probability of presence of an EMF noise, and the reflected risk level. The type of protection in the present example in each state of the phone
line is different:
During the IDLE line state, the equipment is protected by INSULATION
concept. INSULATION = GALVANICALLY INSULATED OR ATTENUATED.
While the phone line is in the IDLE state i.e., the line is INACTIVE, the phone line
and the connected equipment is protected by insulating it from the telephone line.
That INSULATION is carried out in the device. The device must be located at any
point on the line, between the entry to the premises and to the connection point
into the protected equipment. The protection device identifies the IDLE state of
the phone line and automatically switches itself to INSULATE the phone line from
its equipment.
During the IDLE state, the protecting device logic unit automatically
identifies the ringing state or the lifting of the hook by the user, and then switches
itself to the CONNECTED state OR NON-ATTENUATED.
During the ACTIVE state, when the phone line is connected to its
equipment, the equipment is protected by the LIMITATION concept or the
ISOLATION concept described above.
The above example refers to a device adopted to protect a telephone line
and equipment. However, it is within the scope of the invention and device to protect any
electrical and electronic device and apparatus and/or appliances, provided some
of the compounds such as the switch and the sensor are charged in accordance
with the specific apparatus. Further, the sensors are adapted to the nature of the signal and its characteristics. The outcome of the sensor which defines the status is transferred to the logic unit which controls the operation of switch 8.

Claims

1. A protecting device for electric and electronic devices and appliances which comprises in combination: a) a signal input connection to the EMF surge protection unit; b) a protected output signal connection from the EMF surge protection unit to the users at the protected zone; c) a logic unit of decision for the signal galvanic connection or attenuation level by a switch; d) an assess Logic unit, adopted to evaluate the signal status or the signal usage status; e) a switch for galvanic connection / attenuation level change from the incoming signal and protected zone signal; and f) a logic unit for the assessment of the input signal, define the conditions to pass a request to change mode.
2. The device as claimed in claim 1 provided with an optional sensor to sense the in-coming signal, which can be realized using a galvanically insulated sensing technique.
3. The device as claimed in claim 1 or 2 provided with an optional sensor to sense the signal from the protected zone.
4. The device as claimed in any of claims 1 to 3 provided with an optional input for request or conditional request for the operating of said switch.
5. The device as claimed in any of claims 1 to 4 provided with slow EMF energy absorbing devices to cut the energy level while the voltage is rising beyond a certain level, pass the excess energy to the earth.
6. The device as claimed in any of claims 1 to 5 provided with fast EMF energy absorbing devices.
7. The device as claimed in any of claims 1 to 6 provided with devices of an inductive, resistive or capacitive nature.
8. 8. The device as claimed in any of claims 1 to 7 provided with a
protection device power supply.
9. The device as claimed in any of claims 1 to 8 provided with optional
signal and/or protection status output.
10. A device as claimed in any of claims 1 to 9 being galvanically insulated
or/and change the properties of the connection of the Telephone,
Communication Network, antenna or other input line to the equipment.
11. A device as claimed in any of claims 1 to 10 adapted to (a) distinguish
the line usage state, wherein the line is connected while the line is in
use, and insulated while the line is not in use and connection is not
required, and (b) distinguish the equipment usage state, wherein the
line is connected while the equipment or another related unit is "ON"
state, and insulated while the equipment or another related unit is
switched to "OFF" state.
12. A protecting device as claimed in any of claims 1 to 10 which can
distinguish the line or equipment usage mode, determine the highest
10 protection possible for this mode, and adapt the protection scheme to this mode.
13. A protecting device as claimed in claims 1 to 10 wherein said sensors would sense the state of the line and the connected equipment.
14. A protecting device as claimed in claims 1 to 10 wherein said sensors will use a galvanically insulated or high impedance sensor, which will have negligible or no effect on the line and equipment.
15. A protecting device as claimed in any of claims 1 to 10 where a limitation unit is provided which can be used in the protecting device, to enhance the ability of the protecting device to protect from high energy surges at the line while the line and equipment are connected.
16. A protecting device as claimed in claims 1 to 10 wherein a limitation unit is provided which can use staged architecture in order to stop and reduce the energy wave from entering the equipment, so as to be able to reduce the energy to a size that can be tolerated by the equipment
with no damage.
17. A protecting device as claimed in claims 14 to 16 wherein said limitation unit can include energy slope barrier device for either the common mode energy wave or a differential mode energy wave.
18. A protecting device as claimed in claims 1 to 10 wherein said electronic logic system of the protecting device can automatically, on the basis of needs definitions and/or connected sensors, switch the protecting schemes from insulation to limitation and vice versa.
11
9. A protection device, substantially as hereinbefore described and with reference to the accompanying drawings.
12
PCT/IL1999/000054 1998-01-28 1999-01-28 Lightning protection device for wired equipment WO1999039419A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP99901872A EP1058956A1 (en) 1998-01-28 1999-01-28 Lightning protection device for wired equipment
AU21831/99A AU2183199A (en) 1998-01-28 1999-01-28 Lightning protection device for wired equipment
CA002318876A CA2318876A1 (en) 1998-01-28 1999-01-28 Lightning protection device for wired equipment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL123087 1998-01-28
IL12308798A IL123087A0 (en) 1998-01-28 1998-01-28 Lightning protection device for wired equipment

Publications (1)

Publication Number Publication Date
WO1999039419A1 true WO1999039419A1 (en) 1999-08-05

Family

ID=11071146

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL1999/000054 WO1999039419A1 (en) 1998-01-28 1999-01-28 Lightning protection device for wired equipment

Country Status (5)

Country Link
EP (1) EP1058956A1 (en)
AU (1) AU2183199A (en)
CA (1) CA2318876A1 (en)
IL (1) IL123087A0 (en)
WO (1) WO1999039419A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1204300A1 (en) * 2000-11-02 2002-05-08 Hitachi, Ltd. Lighting apparatus, lighting control system and home electric appliance
WO2002050973A1 (en) * 2000-12-20 2002-06-27 Power Innovations Limited Modem protection circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142430A (en) * 1990-03-28 1992-08-25 Anthony Anthony A Power line filter and surge protection circuit components and circuits
US5222119A (en) * 1990-10-20 1993-06-22 Fujitsu Limited Communication system and a method, to detect a power exposure of a communication line
US5315651A (en) * 1993-06-09 1994-05-24 Rockwell International Corporation Active surge rejection circuit
US5369666A (en) * 1992-06-09 1994-11-29 Rockwell International Corporation Modem with digital isolation
US5390231A (en) * 1993-04-01 1995-02-14 Northern Telecom Limited Protection and recovery of telephone line interface circuits

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142430A (en) * 1990-03-28 1992-08-25 Anthony Anthony A Power line filter and surge protection circuit components and circuits
US5222119A (en) * 1990-10-20 1993-06-22 Fujitsu Limited Communication system and a method, to detect a power exposure of a communication line
US5369666A (en) * 1992-06-09 1994-11-29 Rockwell International Corporation Modem with digital isolation
US5390231A (en) * 1993-04-01 1995-02-14 Northern Telecom Limited Protection and recovery of telephone line interface circuits
US5315651A (en) * 1993-06-09 1994-05-24 Rockwell International Corporation Active surge rejection circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1204300A1 (en) * 2000-11-02 2002-05-08 Hitachi, Ltd. Lighting apparatus, lighting control system and home electric appliance
US6713975B2 (en) 2000-11-02 2004-03-30 Hitachi, Ltd. Lighting apparatus, lighting control system and home electric appliance
WO2002050973A1 (en) * 2000-12-20 2002-06-27 Power Innovations Limited Modem protection circuit

Also Published As

Publication number Publication date
AU2183199A (en) 1999-08-16
IL123087A0 (en) 1998-09-24
CA2318876A1 (en) 1999-08-05
EP1058956A1 (en) 2000-12-13

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