US4677518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transient voltage surge suppressor
Assignee: Power Integrity Corp
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Filing: 1984-06-11
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Granted: 1987-06-30
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Expires: 2004-06-11
Abstract
Abstract A transient surge suppression system utilizes a negative resistance voltage breakdown device such as a gas discharge tube or a semiconductor device such as a SIDAC in series with a resistance element, preferably a non-linear resistance element, such as a varistor or Zener diode, to limit the amplitude of voltage transients applied to electrical equipment being protected. The breakdown device breaks down when a sufficiently high amplitude voltage transient is applied thereto, and the resistive element serves to protect the breakdown device from damage by excessive follow-on current. If a non-linear resistance device is used as the resistance element, the voltage across the combination is reduced at high currents. Several units may be cascaded to achieve sequential breakdown of multiple devices to thereby share the surge current among several devices and to reduce the dynamic impedance of the circuit and to multiply power dissipation capacity of the transient voltage surge suppression system.
Inventors
- 👤 Walton N. Hershfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:24
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
138 words
A transient surge suppression system comprising: a pair of input terminals; a first gas discharge tube connected in series with a first resistance device to form a first series combination coupled between a second pair of terminals providing a single electrical conduction path therebetween, said second pair of terminals being connected across said input terminals; a second gas discharge tube connected in series with a second resistance device to form a second series combination coupled between a third pair of terminals providing a single electrical conduction path therebetween; an integrating delay circuit coupling said second and third pairs of terminals wherein at least one terminal of said second pair of terminals is connected in common with one terminal of said third pair of terminals; and a pair of output terminals electrically coupled to said third pair of terminals.
Claim 2
Dependent Claim
138 words
A transient surge suppression system comprising: a pair of input terminals; a first gas discharge tube connected in series with a first resistance device to form a first series combination coupled between a second pair of terminals providing a single electrical conduction path therebetween, said second pair of terminals being connected across said input terminals; a second gas discharge tube connected in series with a second resistance device to form a second series combination coupled between a third pair of terminals providing a single electrical conduction path therebetween; an integrating delay circuit coupling said second and third pairs of terminals wherein at least one terminal of said second pair of terminals is connected in common with one terminal of said third pair of terminals; and a pair of output terminals electrically coupled to said third pair of terminals.
Claim 3
Dependent Claim
27 words
A transient surge suppressor as recited in claim 1 wherein the values of said gas discharge tubes and said resistance devices are selected to prevent holdover current.
Claim 4
Dependent Claim
20 words
A transient surge supression system as recited in claim 1 wherein said first resistance device is a non-linear resistance device.
Claim 5
Dependent Claim
25 words
A transient surge suppression system as recited in claim 3 wherein the other of said first and second resistance devices is a non-linear resistance device.
Claim 6
Dependent Claim
20 words
A system as recited in claim 3 wherein one of said first and second resistance devices is a Zener diode.
Claim 7
Dependent Claim
23 words
A transient surge suppression system as recited in claim 3 wherein one of said first and second resistance devices is a selenium stack.
Claim 8
Dependent Claim
24 words
A transient surge suppression system as recited in claim 3 wherein one of said first and second resistance devices is a voltage variable resistor.
Claim 9
Dependent Claim
27 words
A transient surge suppression system as recited in claim 1 wherein said second resistance device has a resistance higher than the resistance of said first resistance device.
Claim 10
Dependent Claim
21 words
A transient surge suppression system as recited in claim 1 wherein said integrating delay circuit includes an inductor and a capacitor.
Claim 11
Dependent Claim
17 words
A transient surge suppression system as recited in claim 9 wherein said inductor includes a ferrite bead.
Claim 12
Dependent Claim
18 words
A transient surge suppression system as recited in claim 10 wherein said first resistance device is a varistor.
Claim 13
Dependent Claim
18 words
A transient surge suppression system as recited in claim 11 wherein said second resistance device is a varistor.
Claim 14
Dependent Claim
43 words
A transient surge suppression surge as recited in claim 1 wherein said system includes a third gas discharge tube connected in series with a third resistance element to form a third series combination interposed between said second series combination and said output terminals.
Claim 15
Dependent Claim
27 words
A transient surge suppression system as recited in claim 13 furthur including a second integrating delay circuit coupling said third series combination to said second series combination.
Claim 16
Dependent Claim
24 words
A transient surge suppression system as recited in claim 14 wherein said second integrating delay circuit includes a second inductor and a second capacitor.
Claim 17
Dependent Claim
136 words
A transient surge suppression system comprising: a pair of input terminals; a first SIDAC device connected in series with a first resistance device to form a first series combination coupled between a second pair of terminals providing a single electrical conduction path therebetween, said second pair of terminals being connected across said input terminals; a second SIDAC device connected in series with a second resistance device to form a second series combination coupled between a third pair of terminals providing a single electrical conduction path therebetween; an integrating delay circuit coupling said second and third pair of terminals wherein at least one terminal of said second pair of terminals is connected in common with one terminal of said third pair of terminals; and a pair of output terminals electrically coupled to said third pair of terminals.
Claim 18
Dependent Claim
136 words
A transient surge suppression system comprising: a pair of input terminals; a first SIDAC device connected in series with a first resistance device to form a first series combination coupled between a second pair of terminals providing a single electrical conduction path therebetween, said second pair of terminals being connected across said input terminals; a second SIDAC device connected in series with a second resistance device to form a second series combination coupled between a third pair of terminals providing a single electrical conduction path therebetween; an integrating delay circuit coupling said second and third pair of terminals wherein at least one terminal of said second pair of terminals is connected in common with one terminal of said third pair of terminals; and a pair of output terminals electrically coupled to said third pair of terminals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |