US4555741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for eliminating inrush-current
Assignee: Individual
•
Filing: 1984-06-01
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Granted: 1985-11-26
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Expires: 2004-06-01
Abstract
Abstract The present invention provides a device for eliminating inrush-current, comprising connecting a power switch, pair of diode in reverse parallel, a resistance, a rectifier, a time constant circuit and a thyristor in a manner such that an ac current is supplied to a load through the resistance for a period, determined by the time constant circuit, after switching-on of the power switch, and that the rated current is supplied to the load after lapse of the period by allowing the thyristor both to conduct and to short the resistance.
Inventors
- 👤 Kazumi Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:43
CPC Classifications
H; H05; H05B; H05B39/00; H05B39/02; Y; Y10; Y10S; Y10S323/00; Y10S323/908
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
82 words
A device for eliminating inrush-current, comprising the components of a power switch, a thyristor, pair of diodes in reverse parallel, a resistance, a rectifier and a time constant circuit, (1) the switch, pair of diodes and resistance being connected in series; (2) the thyristor being connected to the resistance in parallel; (3) one terminal of the diode pair being connected to the time constant circuit through the rectifier; and (4) the time constant circuit being connected to the gate of the thyristor.
Claim 2
Independent Claim
82 words
A device for eliminating inrush-current, comprising the components of a power switch, a thyristor, pair of diodes in reverse parallel, a resistance, a rectifier and a time constant circuit, (1) the switch, pair of diodes and resistance being connected in series; (2) the thyristor being connected to the resistance in parallel; (3) one terminal of the diode pair being connected to the time constant circuit through the rectifier; and (4) the time constant circuit being connected to the gate of the thyristor.
Claim 3
Dependent Claim
16 words
A device as set forth in claim 1, wherein said thyristor is a bidirectional triode thyristor.
Claim 4
Dependent Claim
18 words
A device as set forth in claim 1, wherein said time constant circuit is a CR-time constant circuit.
Claim 5
Dependent Claim
16 words
A device as set forth in claim 1, wherein two or more diode pairs are cascaded.
Claim 6
Dependent Claim
16 words
A device as set forth in claim 1, which is used in an incandescent lamp circuit.
Claim 7
Dependent Claim
21 words
A device as set forth in claim 5, wherein the resistance is set in the range from 50 to 100 ohms.
Claim 8
Independent Claim
92 words
A method for eliminating inrush-current which occurs in a current circuit, comprising: inserting a pair of diodes, connected in reverse parallel, within a main current circuit; applying a voltage fall generated between the pair of diodes which are operated in the nonlinear region of their voltage-current characteristic to a CR-time constant circuit through a rectifier; and applying the output of the CR-time constant circuit to the gate of a bidirectional triode thyristor to allow the thyristor to conduct and also to short a series resistance which is inserted within the current circuit.
Claim 9
Independent Claim
92 words
A method for eliminating inrush-current which occurs in a current circuit, comprising: inserting a pair of diodes, connected in reverse parallel, within a main current circuit; applying a voltage fall generated between the pair of diodes which are operated in the nonlinear region of their voltage-current characteristic to a CR-time constant circuit through a rectifier; and applying the output of the CR-time constant circuit to the gate of a bidirectional triode thyristor to allow the thyristor to conduct and also to short a series resistance which is inserted within the current circuit.
Claim 10
Dependent Claim
17 words
A method as set forth in claim 7, wherein two or more pairs of diodes are cascaded.
Claim 11
Dependent Claim
17 words
A method as set forth in claim 7, wherein said current circuit is an incandescent lamp circuit.
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) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |