US3921054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for converting D.C. voltage
Assignee: Siemens AG
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Filing: 1974-09-12
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Granted: 1975-11-18
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Expires: 1994-09-12
Abstract
Abstract The invention concerns a D.C. voltage converter with a transformer which has a magnetization reversing coil connected in series with a limiting resistor across the D.C. voltage source. The invention consists of connecting a choke inductor in series with the magnetization reversing coil and the limiting resistor where the choke inductor has an inductance value such that the magnetization reversing current is at all times greater than the value V/R, where V signifies the voltage of the D.C. voltage source and R signifies the ohmic resistance value of the limiting resistor. This arrangement yields a reduction of the physical size of the transformer.
Inventors
- 👤 Harald Heinicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:41
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/305; H02M3/315
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
137 words
Apparatus for converting the D.C. level of a constant voltage source having a negative and positive terminal comprising a transformer having a primary coil, a secondary coil, and a magnetization reversing coil switching means, rectifying means, where the primary coil in series with the switching means is connected in parallel across the constant voltage source, one side of the secondary coil is connected to the positive terminal of the constant voltage source and the other side is connected to the rectifying means, the magnetization reversing coil is connected between the positive terminal of the constant voltage source and a series connected limiting resistor and choke inductor connected to the constant voltage source negative terminal, said magnetization reversing coil connected so that current flowing in it is in a direction opposite to that flowing in the primary coil.
Claim 2
Dependent Claim
137 words
Apparatus for converting the D.C. level of a constant voltage source having a negative and positive terminal comprising a transformer having a primary coil, a secondary coil, and a magnetization reversing coil switching means, rectifying means, where the primary coil in series with the switching means is connected in parallel across the constant voltage source, one side of the secondary coil is connected to the positive terminal of the constant voltage source and the other side is connected to the rectifying means, the magnetization reversing coil is connected between the positive terminal of the constant voltage source and a series connected limiting resistor and choke inductor connected to the constant voltage source negative terminal, said magnetization reversing coil connected so that current flowing in it is in a direction opposite to that flowing in the primary coil.
Claim 3
Dependent Claim
60 words
The apparatus of claim 1 wherein the inductance value of said choke inductor is sufficient depending on the frequency and modulation of said switching means to prevent the current flowing in said magnetization reversing coil from rising to a value VR where V is the voltage of said constant voltage source and R is the resistance of said limiting resistor.
References Cited (Backward Citations)
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US3119060A
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US3322968A
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US3381165A
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US3665292A
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |