US3710135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating and direct current transformer using harmonic modulator
Assignee: Technical Management Services
•
Filing: 1971-01-15
•
Granted: 1973-01-09
•
Expires: 1991-01-15
Abstract
Abstract The harmonic modulator, preferably a single-core second harmonic modulator, is made into a transformer capable of transforming both alternating and direct currents by the use of two output windings on the core, a ''''drive'''' winding and a ''''sense'''' winding. A high-gain amplifier is connected to the drive and sense windings in a first feed-back loop to quickly balance and maintain the voltage across the sense winding at zero, and to thus maintain the rate of change of flux in the core at zero. A second feed-back loop detects the second harmonic content of the output signal from the core, and feeds a signal back to the amplifier to balance out flux caused by very low frequency or direct current input signals. The modulator preferably uses a spiral tape magnetic core whose ends are connected together to form a short-circuited secondary winding for an energizing transformer. The end connection preferable passes through the core laminations so as to avoid unbalancing the device.
Inventors
- 👤 R Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:40
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/42; H01F27/422; H01F27/427; H01F38/00; H01F38/02; H01F38/04; H01F38/20; H01F38/22; H01F38/28
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
86 words
A magnetic flux modulator comprising a core of magnetic material, at least one output winding on said core, and energizing means for causing an alternating electrical current to flow in said magnetic core in a director such that the magnetic flux developed by said current develops substantially no net e.m.f. in said winding, an even harmonic detector for detecting the even harmonic content of the signal in said output winding, and means for utilizing the detected signal for balancing the total core flux at substantially zero.
Claim 2
Dependent Claim
86 words
A magnetic flux modulator comprising a core of magnetic material, at least one output winding on said core, and energizing means for causing an alternating electrical current to flow in said magnetic core in a director such that the magnetic flux developed by said current develops substantially no net e.m.f. in said winding, an even harmonic detector for detecting the even harmonic content of the signal in said output winding, and means for utilizing the detected signal for balancing the total core flux at substantially zero.
Claim 3
Dependent Claim
165 words
A magnetic flux modulator comprising a core of magnetic material, at least one output winding on said core, and energizing means for causing an alternating electrical current to flow in said magnetic core in a direction such that the magnetic flux developed by said current develops substantially no net e.m.f. in said winding, said energizing means including a second magnetic core, alternating current drive and winding means for said second core, the first-named core being wound around said second core as a short-circuited secondary turn, said first core being made of a wound, elongated high-permeability conductive member, and means for conductively connecting the ends of said member together without thereby creating a net fractional turn around said first core, said conductive member being a tape which is coiled to form said core, said core having a hole through it, said hole being in the approximate center of the coiled tape material, and a conductor extending through said hole and interconnecting the ends of said tape.
Claim 4
Dependent Claim
165 words
A magnetic flux modulator comprising a core of magnetic material, at least one output winding on said core, and energizing means for causing an alternating electrical current to flow in said magnetic core in a direction such that the magnetic flux developed by said current develops substantially no net e.m.f. in said winding, said energizing means including a second magnetic core, alternating current drive and winding means for said second core, the first-named core being wound around said second core as a short-circuited secondary turn, said first core being made of a wound, elongated high-permeability conductive member, and means for conductively connecting the ends of said member together without thereby creating a net fractional turn around said first core, said conductive member being a tape which is coiled to form said core, said core having a hole through it, said hole being in the approximate center of the coiled tape material, and a conductor extending through said hole and interconnecting the ends of said tape.
Claim 5
Dependent Claim
20 words
A modulator as in claim 2 in which said hole is substantially orthogonal to the central axis of said coils.
Claim 6
Dependent Claim
20 words
A modulator as in claim 2 in which said hole is substantially parallel to the central axis of said coils.
Claim 7
Dependent Claim
137 words
A magnetic flux modulator comprising a core of magnetic material, at least one output winding on said core, and energizing means for causing an alternating electrical current to flow in said magnetic core in a direction such that the magnetic flux developed by said current develops substantially no net e.m.f. in said winding, said energizing means including a second magnetic core, alternating current drive and winding means for said second core, the first-named core being wound around said second core as a short-circuited secondary turn, said first core consisting of two elements, each comprising a coiled high-permeability conductive tape member, the direction in which the coils are coiled being opposite, and means for conductively connecting symmetrically the inside ends of said coils to one another and for connecting the outside ends of said coils to one another.
Claim 8
Dependent Claim
137 words
A magnetic flux modulator comprising a core of magnetic material, at least one output winding on said core, and energizing means for causing an alternating electrical current to flow in said magnetic core in a direction such that the magnetic flux developed by said current develops substantially no net e.m.f. in said winding, said energizing means including a second magnetic core, alternating current drive and winding means for said second core, the first-named core being wound around said second core as a short-circuited secondary turn, said first core consisting of two elements, each comprising a coiled high-permeability conductive tape member, the direction in which the coils are coiled being opposite, and means for conductively connecting symmetrically the inside ends of said coils to one another and for connecting the outside ends of said coils to one another.
Claim 9
Dependent Claim
80 words
A current transformer, said transformer comprising, in combination, a harmonic modulator including transformer means with core means and a pair of secondary windings, balancing means for maintaining the total flux in said core means substantially at zero, said balancing means comprising a high-gain amplifier connected in a first feed-back path between said secondary windings, and detector means for detecting the even harmonic content of the output signal of said harmonic modulator and feeding a corresponding signal back to said amplifier.
Claim 10
Dependent Claim
80 words
A current transformer, said transformer comprising, in combination, a harmonic modulator including transformer means with core means and a pair of secondary windings, balancing means for maintaining the total flux in said core means substantially at zero, said balancing means comprising a high-gain amplifier connected in a first feed-back path between said secondary windings, and detector means for detecting the even harmonic content of the output signal of said harmonic modulator and feeding a corresponding signal back to said amplifier.
Claim 11
Dependent Claim
55 words
A transformer as in claim 6 in which said detector means includes means for rectifying the even harmonic output signals of said modulator, holding integrator means for receiving the output of said rectifying means and delivering to said amplifier a flux-correction signal which is a function of the magnitude of said even harmonic output signals.
Claim 12
Dependent Claim
38 words
A transformer as in claim 6 including an alternating frequency source of energizing current for said modulator, and means for sweeping the frequency of said source repetitively at a repetition rate different from the frequency of said source.
Claim 13
Dependent Claim
27 words
A transformer as in claim 6 in which the time-constant of the first feed-back path is subStantially smaller than the time constant of the last-named feed-back path.
Claim 14
Dependent Claim
48 words
A transformer as in claim 6 including supply means for supplying alternating exciting current to said modulator core means, said supply means including means for causing said exciting current to flow in said core means in a direction such that no net e.m.f.''s are developed in said windings.
Claim 15
Dependent Claim
39 words
A transformer as in claim 6 including a clock source and at least one frequency divider for dividing the frequency of the output of said clock, and means for supplying alternating energizing current to said modulator from said divider.
Claim 16
Dependent Claim
43 words
A transformer as in claim 11 in which said detector means includes a synchronous rectifier, and means for deriving from said clock source and applying to said detector means a synchronizing signal at an even multiple of the frequency of the energizing current.
Claim 17
Dependent Claim
62 words
A transformer operable to transform both alternating and direct current input signals, said transformer comprising, in combination, an active alternating current transformer together with means for operating said alternating current transformer as an even harmonic modulator and utilizing the even harmonic signal produced by said modulator to compensate for deviations of the net flux level in said core from a zero level.
Claim 18
Dependent Claim
62 words
A transformer operable to transform both alternating and direct current input signals, said transformer comprising, in combination, an active alternating current transformer together with means for operating said alternating current transformer as an even harmonic modulator and utilizing the even harmonic signal produced by said modulator to compensate for deviations of the net flux level in said core from a zero level.
Claim 19
Dependent Claim
32 words
A transformer as in claim 13 in which said active transformer includes a pair of secondary windings and a high-gain amplifier connected therebetween to keep the alternating current-developed flux substantially at zero.
Claim 20
Dependent Claim
64 words
A transformer comprising a magnetic core with at least one output winding and amplifier means for maintaining the total core flux at substantially zero, energizing means for supplying alternating exciting current to said core in a direction such that substantially no net e.m.f.''s are developed in said winding, means for detecting harmonic signals in said winding and delivering corresponding signals to said amplifier means.
Claim 21
Dependent Claim
64 words
A transformer comprising a magnetic core with at least one output winding and amplifier means for maintaining the total core flux at substantially zero, energizing means for supplying alternating exciting current to said core in a direction such that substantially no net e.m.f.''s are developed in said winding, means for detecting harmonic signals in said winding and delivering corresponding signals to said amplifier means.
Claim 22
Dependent Claim
42 words
A transformer as in claim 15 in which said energizing means includes a second magnetic core, alternating current drive and winding means for said second core, the first-named core being wound with respect to said second core as a short-circuited secondary turn.
Claim 23
Dependent Claim
42 words
A transformer as in claim 16 in which said first core is made of a wound, elongated high-permeability conductive member, and means for conductively connecting the ends of said member together without thereby creating a net fractional turn around said first core.
Claim 24
Dependent Claim
41 words
A transformer as in claim 16 in which said first core has the shape of a closed loop, said second core extending through said loop, said winding means comprising a pair of windings spaced symmetrically with respect to said first core.
Claim 25
Dependent Claim
23 words
A transformer as in claim 16 in which said first core has a central opening, said second core extending around said first core.
Claim 26
Dependent Claim
28 words
A transformer as in claim 19 in which said winding means includes a plurality of windings substantially parallel to said first core and inside of said second core.
Claim 27
Dependent Claim
20 words
A transformer as in claim 19 including a plurality of said second cores at spaced intervals along said first core.
Claim 28
Dependent Claim
178 words
A current transformer comprising a coiled tape high-permeability first core, a drive and a sense winding on said core, a high-gain amplifier connected to receive flux-induced signals from said sense winding, amplify said signals, and deliver amplified signals to said drive winding to balance changes in net flux in said core, a phase-splitter connected to receive the second harmonic output of said drive winding, a synchronous detector, a holding integrator connected to receive the output of said detector and to deliver its output to said amplifier, a clock source, a first divider for deviding the frequency of said clock source and delivering a second synchronizing signal to said synchronous detector, second divider means for dividing the frequency of said first divider to form a fundamental frequency energizing signal, an exciting transformer for sAid first core, said exciting transformer including a second core encircling said first core and primary windings energized by said second divider means, said first core forming a short-circuited secondary turn for said exciting transformer and carrying exciting current in the longitudinal direction through said tape.
Claim 29
Dependent Claim
178 words
A current transformer comprising a coiled tape high-permeability first core, a drive and a sense winding on said core, a high-gain amplifier connected to receive flux-induced signals from said sense winding, amplify said signals, and deliver amplified signals to said drive winding to balance changes in net flux in said core, a phase-splitter connected to receive the second harmonic output of said drive winding, a synchronous detector, a holding integrator connected to receive the output of said detector and to deliver its output to said amplifier, a clock source, a first divider for deviding the frequency of said clock source and delivering a second synchronizing signal to said synchronous detector, second divider means for dividing the frequency of said first divider to form a fundamental frequency energizing signal, an exciting transformer for sAid first core, said exciting transformer including a second core encircling said first core and primary windings energized by said second divider means, said first core forming a short-circuited secondary turn for said exciting transformer and carrying exciting current in the longitudinal direction through said tape.
References Cited (Backward Citations)
US3080549A
Cited
US2997667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |