Patent US4697230A successfully refreshed from Google Patents.
US4697230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
AC power supplied static switching apparatus having energy recovery capability
Assignee: AEG Westinghouse Industrial Automation Corp
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Filing: 1986-06-23
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Granted: 1987-09-29
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Expires: 2006-06-23
Abstract
Abstract A three-phase matrix converter including switches having snubber circuits associated thereto, is provided with a common voltage clamp capacitor for limiting the voltage applied to the snubber capacitor, and energy is accumulated in the clamp capacitor which is controllably dissipated, in particular by providing energy to auxiliary elements of the overall system.
Inventors
- 👤 Charles L. Neft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:50
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/275; H02M5/297; H02M3/00; H02M3/02; H02M3/04; H02M3/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
In a matrix converter for directly converting AC power from an AC supply to an AC load including a plurality of bilateral switches connected on respective AC phase lines, the combination of: a common capacitor connected between opposite pole ends of each of said bilateral switches through corresponding diode means, for deriving from said pole ends current under substantially constant DC voltage; and means connected across said common capacitor for dissipating energy accumulated in said common capacitor.
Claim 2
Dependent Claim
77 words
In a matrix converter for directly converting AC power from an AC supply to an AC load including a plurality of bilateral switches connected on respective AC phase lines, the combination of: a common capacitor connected between opposite pole ends of each of said bilateral switches through corresponding diode means, for deriving from said pole ends current under substantially constant DC voltage; and means connected across said common capacitor for dissipating energy accumulated in said common capacitor.
Claim 3
Dependent Claim
45 words
The matrix converter of claim 1 with said energy dissipating means including resistor means, control means being provided operative at a predetermined maximum voltage level upon said common capacitor for connecting said resistor means across said common capacitor, thereby to dissipate said derived energy therethrough.
Claim 4
Dependent Claim
57 words
The matrix of claim 2 with said control means including unilateral switching means connected in series with said resistor means across said common capacitor, and voltage comparator means responsive to the voltage buildup upon said common capacitor, said voltage comparator means being operable to close said unilateral switching means when said predetermined maximum voltage level is exceeded.
Claim 5
Dependent Claim
52 words
The matrix converter of claim 1 with means connected across said common capacitor for recovering energy therefrom, and means responsive to said energy recovering means for providing auxiliary energy for said matrix converter; energy dissipating means being provided operative with accumulated energy in excess of energy derived by said energy recovering means.
Claim 6
Dependent Claim
35 words
The matrix converter of claim 4, with said energy recovering means including inverter means operative with said common capacitor voltage for generating AC voltage at a high frequency as a vehicle of said auxiliary energy.
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) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |