US3705340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Buffer system for static transverters
Assignee: Siemens AG
•
Filing: 1971-10-15
•
Granted: 1972-12-05
•
Expires: 1991-10-15
Abstract
Abstract A static transverter, of the type in which semi-conductor controlled rectifiers (thyristors) provide the commutation and in which variation of the direct current link circuit is used to control the output frequency, is provided with a buffer system connected to the direct current link circuit for keeping the transverter in operation during short power failures. Buffer capacitance is distributed in a series of capacitors respectively charged to different voltages by a separate source. These capacitors are connected in parallel to the direct current link circuit through diodes.
Inventors
- 👤 Wolfgang Weisser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:31
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/062
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
Apparatus for buffering a static transverter having a variable direct current link circuit in order to maintain output during short power failures, comprising: a. an array of storage capacitors having different voltage ratings and having relative capacitance magnitudes in inverse order to said voltage ratings; b. means for charging said capacitors from a source of power other than said link circuit, said means being adapted to charge said capacitors to different voltages in the same magnitude order as their voltage ratings, and c. means connecting each of said capacitors across said link circuit with the same charge polarity as the operating voltage of said link circuit, said means including diodes respectively connected between one terminal of each of said capacitors and said link circuit with such diode polarity as to isolate the said capacitors respectively from the operating voltage of said link circuit so long as said operating voltage exceeds the voltage across the capacitor in question.
Claim 2
Dependent Claim
157 words
Apparatus for buffering a static transverter having a variable direct current link circuit in order to maintain output during short power failures, comprising: a. an array of storage capacitors having different voltage ratings and having relative capacitance magnitudes in inverse order to said voltage ratings; b. means for charging said capacitors from a source of power other than said link circuit, said means being adapted to charge said capacitors to different voltages in the same magnitude order as their voltage ratings, and c. means connecting each of said capacitors across said link circuit with the same charge polarity as the operating voltage of said link circuit, said means including diodes respectively connected between one terminal of each of said capacitors and said link circuit with such diode polarity as to isolate the said capacitors respectively from the operating voltage of said link circuit so long as said operating voltage exceeds the voltage across the capacitor in question.
Claim 3
Dependent Claim
74 words
Apparatus for buffering a static transverter as defined in claim 1 in which at least one capacitor other than the capacitors of said array and having a voltage rating at least as high as that of the capacitor of said array having the highest voltage rating is connected directly across said link circuit and is adapted to function as at least part of a smoothing filter for the output voltage of said link circuit.
Claim 4
Dependent Claim
38 words
Apparatus as defined in claim 2 in which the capacitance of the respective capacitors is so provided that in each voltage range of the direct current link circuit the corresponding available buffering periods are of approximately equal length.
Claim 5
Dependent Claim
20 words
Apparatus as defined in claim 3 in which resistors of low resistance are provided in series respectively with said diodes.
Claim 6
Dependent Claim
30 words
Apparatus as defined in claim 3 in which there is connected, in parallel with the said capacitors across said link circuit, a controllable rectifier adapted to short circuit switching transients.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |