US3875494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static power conversion arrangement for converting direct current power to alternating current power
Assignee: Westinghouse Electric Corp
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Filing: 1973-07-18
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Granted: 1975-04-01
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Expires: 1993-07-18
Abstract
Abstract Direct current (DC) power is converted to alternating current (AC) power by a series combination of first DC to AC converter (inverter) and a cycloconverter connected in parallel with a second DC to AC converter (inverter). All three of the converters are naturally commutated. A commutation voltage for both the cycloconverter and the first inverter is provided by a reactive power source. To augment operation for some uses, the output of the cycloconverter is connected to an inductor, and the AC side of the first inverter is connected to neutral by a capacitor. The cycloconverter is controlled to maintain a near unity power factor.
Inventors
- 👤 Laszlo Gyugyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
194 words
A static power conversion arrangement for converting DC power to AC power comprising: a first naturally commutated inverter adjusted to convey power from the DC side to the AC side thereof and having the DC side connected to the input of the arrangement; a naturally commutated cycloconverter having the input thereof connected to the AC side of said first naturally commutated inverter and adjusted to convey power from the AC side of said first inverter to the output of said cycloconverter; a reactive power source connected to the AC side of said first inverter and to the input of said cycloconverter, said source providing the voltage for commutation of said first inverter and said cycloconverter; and a second naturally commutated inverter adjusted to convey power from the DC side to the AC side thereof and having the DC side thereof connected to the DC side of said first inverter and the AC side thereof connected to the output of said cycloconverter, the AC signal at the output of said cycloconverter providing the commutation voltage for said second inverter, and the AC side of said second inverter being connected to the output of the arrangement.
Claim 2
Dependent Claim
194 words
A static power conversion arrangement for converting DC power to AC power comprising: a first naturally commutated inverter adjusted to convey power from the DC side to the AC side thereof and having the DC side connected to the input of the arrangement; a naturally commutated cycloconverter having the input thereof connected to the AC side of said first naturally commutated inverter and adjusted to convey power from the AC side of said first inverter to the output of said cycloconverter; a reactive power source connected to the AC side of said first inverter and to the input of said cycloconverter, said source providing the voltage for commutation of said first inverter and said cycloconverter; and a second naturally commutated inverter adjusted to convey power from the DC side to the AC side thereof and having the DC side thereof connected to the DC side of said first inverter and the AC side thereof connected to the output of said cycloconverter, the AC signal at the output of said cycloconverter providing the commutation voltage for said second inverter, and the AC side of said second inverter being connected to the output of the arrangement.
Claim 3
Dependent Claim
54 words
A static power conversion arrangement as claimed in claim 1 wherein: said first inverter and said second inverter are each rated for one half per unit of power provided at the output of the arrangement; and said cycloconverter is rated for two thirds per unit of power provided at the output of the arrangement.
Claim 4
Dependent Claim
20 words
A static power conversion arrangement as claimed in claim 1 wherein said reactive power source is a passive tuned circuit.
Claim 5
Dependent Claim
28 words
A static power conversion arrangement as claimed in claim 1 and further comprising an inductor connected between the output of said cycloconverter and the output of the arrangement.
Claim 6
Dependent Claim
26 words
A static power conversion arrangement as claimed in claim 1 and further comprising a capacitor connected from the AC side of said second inverter to neutral.
Claim 7
Dependent Claim
64 words
A static power conversion arrangement as claimed in claim 1 wherein: the alternating current signal at the AC side of said second inverter and the output of said cycloconverter has a frequency of 60 Hz; and said reactive power source provides a signal having a frequency of approximately 360 Hz to the AC side of said first inverter and the input of said cycloconverter.
Claim 8
Dependent Claim
233 words
A static power conversion arrangement for converting DC power to AC power comprising: an input terminal to which a DC signal may be applied; an output terminal from which an AC signal may be obtained; a first naturally commutated inverter having the DC side thereof connected to said input terminal and adjusted to convey power from the DC side to the AC side thereof; a naturally commutated cycloconverter having the input thereof connected to the AC side of said first inverter and adjusted to convey the power at the AC side of said first inverter to its output; an inductive-capacitive tuned circuit connected to the AC side of said first inverter and the input of said cycloconverter, said tuned circuit providing a commutating voltage to both said first inverter and said cycloconverter at a frequency high relative to the frequency of signal at the output of said cycloconverter; an inductor connected between the output of said cycloconverter and said output terminal; a second naturally commutated inverter having the DC side thereof connected to said input terminal and the AC side thereof connected to said output terminal, said second inverter being adjusted to convey power from the DC side to the AC side thereof, the signal at the output of said cycloconverter providing a commutation voltage for said second inverter; and a capacitor connected from the AC side of said second inverter to neutral.
Claim 9
Dependent Claim
233 words
A static power conversion arrangement for converting DC power to AC power comprising: an input terminal to which a DC signal may be applied; an output terminal from which an AC signal may be obtained; a first naturally commutated inverter having the DC side thereof connected to said input terminal and adjusted to convey power from the DC side to the AC side thereof; a naturally commutated cycloconverter having the input thereof connected to the AC side of said first inverter and adjusted to convey the power at the AC side of said first inverter to its output; an inductive-capacitive tuned circuit connected to the AC side of said first inverter and the input of said cycloconverter, said tuned circuit providing a commutating voltage to both said first inverter and said cycloconverter at a frequency high relative to the frequency of signal at the output of said cycloconverter; an inductor connected between the output of said cycloconverter and said output terminal; a second naturally commutated inverter having the DC side thereof connected to said input terminal and the AC side thereof connected to said output terminal, said second inverter being adjusted to convey power from the DC side to the AC side thereof, the signal at the output of said cycloconverter providing a commutation voltage for said second inverter; and a capacitor connected from the AC side of said second inverter to neutral.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |