Patent US3824442A successfully refreshed from Google Patents.
US3824442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter circuits
Assignee: Siemens Mobility Ltd
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Filing: 1972-08-23
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Granted: 1974-07-16
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Expires: 1992-08-23
Abstract
Abstract A polyphase, floating neutral, inverter in which harmonics of the operating frequency are added to the fundamental to increase the line-to-line output voltage for a given input voltage. In the three-phase three-wire case the Triplen harmonics are used. The inverter uses single phase amplifiers and a polyphase drive signal generator. One generator is described in detail. The inverter also includes a rapid acting semiconductor device protection circuit which employs an electrical network analog of the thermal characteristics of the device.
Inventors
- 👤 K King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:02
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M7/53875
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
An inverter arrangement comprising inverter means including input terminals for connection to a d.c. source, and output terminals for supplying a three-phase, three-phase alternating current output, and a drive signal generator for generating a drive signal for said inverter means which includes the fundamental frequency of said alternating current output and 3x harmonics thereof, where x is a positive integer; said inverter means including means responsive to said drive signal for amplifying said signal to the amplitude of the d.c. source so that each phase output waveform includes harmonic components which in conjunction with the harmonic components of the other phase voltages provide a sinusoidal line-to-line waveform of higher value than that formed by the fundamental of each phase voltage, said arrangement further comprising means for restricting the power dissipation in the inverter means during the transistion of the output voltage waveform from one extreme value to the other extreme value which adjusts the relative values of the supply voltage and output voltage of the inverter means during said transition.
Claim 2
Dependent Claim
170 words
An inverter arrangement comprising inverter means including input terminals for connection to a d.c. source, and output terminals for supplying a three-phase, three-phase alternating current output, and a drive signal generator for generating a drive signal for said inverter means which includes the fundamental frequency of said alternating current output and 3x harmonics thereof, where x is a positive integer; said inverter means including means responsive to said drive signal for amplifying said signal to the amplitude of the d.c. source so that each phase output waveform includes harmonic components which in conjunction with the harmonic components of the other phase voltages provide a sinusoidal line-to-line waveform of higher value than that formed by the fundamental of each phase voltage, said arrangement further comprising means for restricting the power dissipation in the inverter means during the transistion of the output voltage waveform from one extreme value to the other extreme value which adjusts the relative values of the supply voltage and output voltage of the inverter means during said transition.
Claim 3
Dependent Claim
21 words
An arrangement aS claimed in claim 1 wherein said power dissipation restricting means adjusts said relative values in a step-wise manner.
Claim 4
Dependent Claim
31 words
An arrangement as claimed in claim 2 which said step-wise adjustment is performed by switching elements arranged to connect appropriate portions of an output transformer between the inverter and a load.
Claim 5
Dependent Claim
29 words
An arrangement as claimed in claim 2 which said adjustment is performed by connecting an appropriate lower one of a plurality of values of supply voltage to the inverter.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |