US3555361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turn on transient limiter
Assignee: FREDERICK C HALLBERG
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Filing: 1968-12-31
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Granted: 1971-01-12
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Expires: 1988-12-31
Abstract
Abstract This disclosure describes a turn-on current transient limiter that controls the peak current that can flow into a high capacity load when voltage is initially applied to the load. A plurality of silicon controlled rectifier (SCR) circuits are connected in a parallel arrangement with the parallel arrangement being connected in series with the load. All of the SCR circuits except the last one, include current limiting means. The SCR circuits are sequentially switched ''''on'''' when voltage is initially applied and limit current until the last one is switched ''''on'''' at which time current transients have dropped below a predetermined level. The invention described herein was made by an employee of the United States Government and may be manufactured and used by or for the Government for governmental purposes without the payment of any royalties thereon or therefor.
Inventors
- 👤 Frederick C Hallberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:44
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/001
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A turn on current transient limiter comprising: a plurality of switching circuits connected in parallel, each of said circuits including a switch, wherein at least two of said switches are silicon controlled rectifiers, a current limiter comprising a resistor connected in series with the switch and a control for controlling the operation of the switch, wherein in some of said switching circuits, diodes are connected between said resistor and s said silicon controlled rectifier; a further circuit connected in parallel with said plurality of switching circuits, said further circuit including a current limiter comprising resistor; and means for connecting said plurality of switching circuits and said further circuit in series between a source and a load.
Claim 2
Dependent Claim
116 words
A turn on current transient limiter comprising: a plurality of switching circuits connected in parallel, each of said circuits including a switch, wherein at least two of said switches are silicon controlled rectifiers, a current limiter comprising a resistor connected in series with the switch and a control for controlling the operation of the switch, wherein in some of said switching circuits, diodes are connected between said resistor and s said silicon controlled rectifier; a further circuit connected in parallel with said plurality of switching circuits, said further circuit including a current limiter comprising resistor; and means for connecting said plurality of switching circuits and said further circuit in series between a source and a load.
Claim 3
Dependent Claim
28 words
A turn on current limiter as claimed in claim 1 wherein said further circuit comprises: a resistor; and, a plurality of diodes connected in series with said resistor.
Claim 4
Dependent Claim
46 words
A turn on current limiter as claimed in claim 2 including a transistor amplifier in each of said plurality of switching circuits, said transistor amplifier connected between said control and said silicon controlled rectifier for amplifying the signal from said control to said silicon controlled rectifier.
Claim 5
Dependent Claim
30 words
The turn on current limiter as claimed in claim 3 wherein said control comprises a resistor-capacitor circuit adapted to charge the capacitor when power is initially applied to the circuit.
Claim 6
Dependent Claim
42 words
The turn on current limiter as claimed in claim 4 including a relay having its coil connected in circuit with the SCR in one of said plurality of switching circuits and having contacts for connection directly between a source and a load.
Claim 7
Dependent Claim
29 words
A turn on current transient limiter as claimed in claim 5 wherein one switch is a transistor switch, said transistor switch being connected in series with said relay coil.
Claim 8
Dependent Claim
37 words
A turn on current transient limiter as claimed in claim 6 including a diode connected in parallel with said relay coil, and including an inductor connected in series with said plurality of switching circuits connected in parallel.
References Cited (Backward Citations)
US3299347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |