Patent US4901183A successfully refreshed from Google Patents.
US4901183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge protection device
Assignee: WORLD PRODUCTS Inc A CORP OF MINNESOTA
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Filing: 1988-08-29
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Granted: 1990-02-13
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Expires: 2008-08-29
Abstract
Abstract A surge or transient protection circuit is described which operates in an immediate fail-safe mode of failure. If an incoming transient exceeds the transient absorption capacity of the circuit, precision fast-blow fuses are immediately opened to remove current from the load to prevent damage to the equipment connected to the transient suppression circuit and to indicate to the user that the transient suppression abilities of this circuit have been damaged. The transient suppression circuit uses silicon transient voltage suppressor components to absorb the fast-rising edge of transients and also uses slower-acting MOV transient absorption devices for the bulk of the overvoltage transient power. Upon short-circuit failure of any of the suppressor components, the excessive current draw produced thereby results in blowing of the fast-blow fuses.
Inventors
- 👤 Benny H. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:18
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/042
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
326 words
A fail-safe voltage surge protection circuit for transient protection of AC lines, comprising: input means having a hot line, a neutral line and a ground line for receiving power from an AC supply line; output means having a hot line, a neutral line and a ground line for supplying said power to a load; a first MOV connected between the hot line and neutral line of said input means, a second MOV connected between the neutral line and the ground line of said input means and a third MOV connected between the hot line and the ground line of the input means; a first silicon transient suppressor connected between the hot line and neutral line of said output means, a second silicon transient suppressor connected between the neutral line and the ground line of said output means and a third silicon transient suppressor connected between the hot line and the ground line of the output means; a first inductor connected between the hot line of said input means and the hot line of said output means, and a second inductor connected between the neutral line of said input means and the neutral line of said output means; first fuse means having a response time of less than 20 milliseconds at a precise current level connected in series in said hot line of said input means for fail-safe removal of said power from said load if any of said first MOV, third MOV, first silicon transient suppressor or third silicon transient suppressor fail shorted; second fuse means having a response time of less than 20 milliseconds at a precise current level connected in series in said neutral line of said input means for fail-safe removal of said power from said load if any of said first MOV, second MOV, first silicon transient suppressor or second silicon transient suppressor fail shorted; and said ground line of said input means connected to said ground line of said output means.
Claim 2
Dependent Claim
326 words
A fail-safe voltage surge protection circuit for transient protection of AC lines, comprising: input means having a hot line, a neutral line and a ground line for receiving power from an AC supply line; output means having a hot line, a neutral line and a ground line for supplying said power to a load; a first MOV connected between the hot line and neutral line of said input means, a second MOV connected between the neutral line and the ground line of said input means and a third MOV connected between the hot line and the ground line of the input means; a first silicon transient suppressor connected between the hot line and neutral line of said output means, a second silicon transient suppressor connected between the neutral line and the ground line of said output means and a third silicon transient suppressor connected between the hot line and the ground line of the output means; a first inductor connected between the hot line of said input means and the hot line of said output means, and a second inductor connected between the neutral line of said input means and the neutral line of said output means; first fuse means having a response time of less than 20 milliseconds at a precise current level connected in series in said hot line of said input means for fail-safe removal of said power from said load if any of said first MOV, third MOV, first silicon transient suppressor or third silicon transient suppressor fail shorted; second fuse means having a response time of less than 20 milliseconds at a precise current level connected in series in said neutral line of said input means for fail-safe removal of said power from said load if any of said first MOV, second MOV, first silicon transient suppressor or second silicon transient suppressor fail shorted; and said ground line of said input means connected to said ground line of said output means.
Claim 3
Dependent Claim
269 words
A fail-safe voltage surge protection circuit for transient protection of AC lines, comprising: input means having a hot line, a neutral line and a ground line for receiving power from an AC supply line; output means having a hot line, a neutral line and a ground line for supplying said power to a load; a first MOV connected between the hot line and neutral line of said input means, a second MOV connected between the neutral line and the ground line of said input means and a third MOV connected between the hot line and the ground line of the input means; a first silicon transient suppressor connected between the hot line and neutral line of said output means, a second silicon transient suppressor connected between the neutral line and the ground line of said output means and a third silicon transient suppressor connected between the hot line and the ground line of the output means; a first inductor connected between the hot line of said input means and the hot line of said output means, and a second inductor connected between the neutral line of said input means and the neutral line of said output means; fuse means having a response time of less than 20 milliseconds at a precise current level connected in series in said hot line of said input means for fail-safe removal of said power from said load if any of said first MOV, third MOV, first silicon transient suppressor or third silicon transient suppressor fail shorted; and said ground line of said input means connected to said ground line of said output means.
Claim 4
Dependent Claim
269 words
A fail-safe voltage surge protection circuit for transient protection of AC lines, comprising: input means having a hot line, a neutral line and a ground line for receiving power from an AC supply line; output means having a hot line, a neutral line and a ground line for supplying said power to a load; a first MOV connected between the hot line and neutral line of said input means, a second MOV connected between the neutral line and the ground line of said input means and a third MOV connected between the hot line and the ground line of the input means; a first silicon transient suppressor connected between the hot line and neutral line of said output means, a second silicon transient suppressor connected between the neutral line and the ground line of said output means and a third silicon transient suppressor connected between the hot line and the ground line of the output means; a first inductor connected between the hot line of said input means and the hot line of said output means, and a second inductor connected between the neutral line of said input means and the neutral line of said output means; fuse means having a response time of less than 20 milliseconds at a precise current level connected in series in said hot line of said input means for fail-safe removal of said power from said load if any of said first MOV, third MOV, first silicon transient suppressor or third silicon transient suppressor fail shorted; and said ground line of said input means connected to said ground line of said output means.
References Cited (Backward Citations)
US3527985A
Cited
US3737725A
Cited
US3777219A
Cited
US3934175A
Cited
US4023071A
Cited
GB1485679A
Cited
US4191985A
Cited
US4068277A
Cited
US4089032A
Cited
US4068279A
Cited
US4271446A
Cited
US4168514A
Cited
US4296336A
Cited
US4325097A
Cited
US4600960A
Cited
US4463406A
Cited
US4698721A
Cited
US4587588A
Cited
US4599636A
Cited
US4563720A
Cited
US4675772A
Cited
US4677518A
Cited
US4584622A
Cited
US4628394A
Cited
US4758920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |