Patent US4209757A successfully refreshed from Google Patents.
US4209757A
Expired / Lapsed
US
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Circuit for compensating harmonic currents in an electric consumer arrangement
Assignee: Siemens AG
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Filing: 1978-03-30
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Granted: 1980-06-24
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Expires: 1998-03-30
Abstract
Abstract To improve the effect of a filter circuit for the harmonics, which contains an L-C-R series resonant circuit in at least one loop, a variable supplementary current excitation which compensates the residual harmonic current in the consumer arrangement at least approximately, is coupled into the series resonant circuit, the supplementary current excitation preferably being supplied by a compensation transformer which is controlled by the current in the loop, the compensation transformer being excited by a source and controlled by an auxiliary transformer arranged in the loop.
Inventors
- 👤 Michael Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:18
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H02; H02J; H02J1/00; H02J1/02; H02J3/00; H02J3/36; H02M; H02M1/00; H02M1/14; H02M1/143; H03H7/17; H03H7/1741; H03H7/1758; H02J2003/365; Y; Y02; Y02E; Y02E60/00; Y02E60/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
A circuit for compensating harmonic currents in a direct current electric supply for a consumer having at least one filter circuit for a harmonic which is connected in parallel to the load and which comprises, in at least one loop, an L-C-R series resonant circuit and a compensation transformer for providing inductively counter-coupled, controller supplementary current excitation and means responsive to the current in the loop for controlling the current in the transducer so as to reduce the harmonic voltage supplied to the consumer to a small value.
Claim 2
Dependent Claim
88 words
A circuit for compensating harmonic currents in a direct current electric supply for a consumer having at least one filter circuit for a harmonic which is connected in parallel to the load and which comprises, in at least one loop, an L-C-R series resonant circuit and a compensation transformer for providing inductively counter-coupled, controller supplementary current excitation and means responsive to the current in the loop for controlling the current in the transducer so as to reduce the harmonic voltage supplied to the consumer to a small value.
Claim 3
Dependent Claim
47 words
The circuit of claim 1 further comprising an auxiliary transformer in the loop and a control device for regulating the input to the compensation transformer from an isolated power source, the control device being coupled to the auxiliary transformer and responding to the current in the loop.
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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |