US4887180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for protecting electronic equipment against strong electromagnetic pulses, more particulary due to lightening
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1988-06-15
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Granted: 1989-12-12
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Expires: 2008-06-15
Abstract
Abstract A device for protecting electronic equipment (42) against strong electromagnetic pulses, the equipment being contained in a radioelectrically insulated enclosure (40) and connected to a line outside the enclosure, the protective device being disposed in another radioelectrically insulated enclosure (2) and comprising an input (4) connected to said line (6) and an output (8) connected to the equipment, the device being characterized in that it comprises in series: at least one first clipping cell (12A) comprising a clipper having one end connected to the input of the clipping cell and another end to ground, and a low-pass filter disposed between the input and the output of the clipping cell, and a filtering cell (14) comprising in series a low-pass filter (12A) and if necessary a device (14B) for switching the cut-off frequency of the filter. The device is particularly applicable to the protection of telephonic and digital lines.
Inventors
- 👤 Jean-Pierre Climent
- 👤 Jean-Claude Tronel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:29
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/06
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
119 words
A device for protecting electronic equipment (42) against strong electromagnetic pulses, the equipment being contained in a radioelectrically insulated enclosure (40) and connected to a line outside the enclosure, the protective device being disposed in another radioelectrically insulated enclosure (2) and comprising an input (4) connected to said line (6) and an output (8) connected to the equipment, the device being characterized in that it comprises in series: at least on first clipping cell (12A) comprising a clipper having one end connected to the input of the clipping cell and another end to ground, and a low-pass filter disposed between the input and the output of the clipping cell, and a filtering cell (14) comprising a low-pass filter (14a).
Claim 2
Independent Claim
119 words
A device for protecting electronic equipment (42) against strong electromagnetic pulses, the equipment being contained in a radioelectrically insulated enclosure (40) and connected to a line outside the enclosure, the protective device being disposed in another radioelectrically insulated enclosure (2) and comprising an input (4) connected to said line (6) and an output (8) connected to the equipment, the device being characterized in that it comprises in series: at least on first clipping cell (12A) comprising a clipper having one end connected to the input of the clipping cell and another end to ground, and a low-pass filter disposed between the input and the output of the clipping cell, and a filtering cell (14) comprising a low-pass filter (14a).
Claim 3
Dependent Claim
90 words
A device according to claim 1, characterized in that it comprises a second clipping cell (12B) comprising a clipper having one end connected to the input of the clipping cell and another end to ground, the clipper of the second cell and the clipper of the first cell having different dynamic triggering characteristics and the low-pass filter of the first clipping cell creating an overvoltage at the terminals of the second clipper for a resonance frequency higher than the maximum frequency contained in the signals normally transmitted on the line.
Claim 4
Independent Claim
26 words
A device according to claims 1 or 2, characterized in that the low-pass filter of the first clipping cell (12A) is an L filter (20, 22).
Claim 5
Independent Claim
20 words
A device according to any of claims 1 to 2, characterized in that each clipper is a discharger (16, 24).
Claim 6
Dependent Claim
78 words
A device according to claim 2, characterized in that the second discharger (25) is of the triple-pole or gate kind, the second clipping cell (12B) also cmprising a low-pass filter made up in series of an inductance (19), a capacitor (21) and an inductance (23) and connected between the input of the main clipping cell and ground, the gate of the second discharger being connected to the common point between the capacitor (21) and the second-mentioned inductance (23).
Claim 7
Dependent Claim
21 words
A device according to claim 2, characterized in that a varistor (18, 26) is also disposed between each discharger and ground.
Claim 8
Dependent Claim
31 words
A device according to claim 1, characterized in that the filtering cell (14) also comprises a means (14B) for switching the cut-off frequency of the low-pass filter (14A) in series therewith.
Claim 9
Dependent Claim
72 words
A device according to claim 7, characterized in that the switching means (14B) comprises in series a capacitor (32) and an inductance disposed between the line and ground, and elements with a conduction threshold at the terminals of the inductance, the threshold being so determined that said elements are conductive when the signal on the line has an amplitude higher than the maximum amplitude of the signals normally transmitted on the line.
Claim 10
Dependent Claim
16 words
A device according to claim 8, characterized in that the threshold elements are diodes (36, 38).
Claim 11
Dependent Claim
39 words
A device according to claim 1, characterized in that the first clipper, the assembly formed by the filter of the main clipping cell and the second clipper, and the filtering cell are each contained in a radioelectrically insulated enclosure.
Claim 12
Dependent Claim
16 words
A device according to claim 3 characterized in that each clipper is a discharger (16, 24).
Claim 13
Dependent Claim
21 words
A device according to claim 3, characterized in that a varistor (18, 26) is also disposed between each discharger and ground.
Claim 14
Dependent Claim
21 words
A device according to claim 4, characterized in that a varistor (18, 26) is also disposed between each discharger and ground.
Claim 15
Dependent Claim
21 words
A device according to claim 5, characterized in that a varistor (18, 26) is also disposed between each discharger and ground.
Claim 16
Dependent Claim
31 words
A device according to claim 2, characterized in that the filtering cell (14) also comprises a means (14B) for switching the cut-off frequency of the low-pass filter (14A) in series therewith.
Claim 17
Dependent Claim
31 words
A device according to claim 3, characterized in that the filtering cell (14) also comprises a means (14B) for switching the cut-off frequency of the low-pass filter (14A) in series therewith.
Claim 18
Dependent Claim
31 words
A device according to claim 4, characterized in that the filtering cell (14) also comprises a means (14B) for switching the cut-off frequency of the low-pass filter (14A) in series therewith.
Claim 19
Dependent Claim
31 words
A device according to claim 5, characterized in that the filtering cell (14) also comprises a means (14B) for switching the cut-off frequency of the low-pass filter (14A) in series therewith.
Claim 20
Dependent Claim
31 words
A device according to claim 6, characterized in that the filtering cell (14) also comprises a means (14B) for switching the cut-off frequency of the low-pass filter (14A) in series therewith.
Claim 21
Dependent Claim
39 words
A device according to claim 2, characterized in that the first clipper, the assembly formed by the filter of the main clipping cell and the second clipper, and the filtering cell are each contained in a radioelectrically insulated enclosure.
Claim 22
Dependent Claim
39 words
A device according to claim 3, characterized in that the first clipper, the assembly formed by the filter of the main clipping cell and the second clipper, and the filtering cell are each contained in a radioelectrically insulated enclosure.
Claim 23
Dependent Claim
39 words
A device according to claim 4, characterized in that the first clipper, the assembly formed by the filter of the main clipping cell and the second clipper, and the filtering cell are each contained in a radioelectrically insulated enclosure.
References Cited (Backward Citations)
US4328523A
Cited
US4675772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |