US2143745A - Constant potential transformer - Google Patents

Constant potential transformer Download PDF

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Publication number
US2143745A
US2143745A US227626A US22762638A US2143745A US 2143745 A US2143745 A US 2143745A US 227626 A US227626 A US 227626A US 22762638 A US22762638 A US 22762638A US 2143745 A US2143745 A US 2143745A
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US
United States
Prior art keywords
winding
core
voltage
resonant circuit
primary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US227626A
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English (en)
Inventor
Joseph G Sola
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SOLA ELECTRIC CO
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SOLA ELECTRIC CO
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL72460D priority Critical patent/NL72460C/xx
Priority to BE435925D priority patent/BE435925A/xx
Application filed by SOLA ELECTRIC CO filed Critical SOLA ELECTRIC CO
Priority to US227626A priority patent/US2143745A/en
Application granted granted Critical
Publication of US2143745A publication Critical patent/US2143745A/en
Priority to GB16005/39A priority patent/GB529420A/en
Priority to FR856672D priority patent/FR856672A/fr
Priority to DES4146D priority patent/DE930885C/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/04—Regulating voltage or current wherein the variable is AC
    • G05F3/06—Regulating voltage or current wherein the variable is AC using combinations of saturated and unsaturated inductive devices, e.g. combined with resonant circuit

Definitions

  • My invention relates to an improved constant potential transformer by means of which variations of input voltage over a wide range of limits may take place without affecting the output voltage to any substantial extent.
  • One of the objects of my invention is to provide a constant potential transformer which is compact as a unit and which may be economically manufactured.
  • a further object of my invention is to provide if) a transformer, the outputvoltage wave of which will have very little distortion and the device will be satisfactory for various commercial-applications.
  • Fig. 1 is a sectional view of one form of construction that may be used
  • Fig. 2 is a diagrammatic illustration of the wiring arrangement that may be used in connec- 30 tion with a construction such as that shown in Fig. 1;
  • Fig. 3 is a sectional view of another form of construction embodying the principles of my invention.
  • Fig. 4 is a diagrammatic illustration of the wiring arrangement that may be used in connection with a construction such as that shown in Fig. 3;
  • Fig. 5 is a diagram showing the vector relations 40 between the various voltages obtained in the illustrated constructions at different values of input voltage.
  • Fig. 6 is a graph showing the relation between the magnitudes of various voltages obtained in 45 the illustrated constructions as the input voltage is varied.
  • a core type of transformer construction is illustrated, the closed magnetic circuit ID of which comprises a stack of I-shaped laminations II in abutting relation with the end legs l2a of a stack of E-shaped laminations l2, which may be held 5 together by any suitable means.
  • I On the end portion A of the core bar H, I have provided a primary winding I3, the terminals I4 and I of which are adapted to be connected with a source of alternating current, the voltage of which from 7 time to time may fluctuate or vary substantially. 5
  • winding On the end portion B of the core bar H, I have mounted a winding it, which is in spaced relation to but magnetically coupled with the winding 13, the winding is having terminal leads I1 and I8 and an intermediate tap l9. That part 10 of the winding IE between the lead l1 and tap l9 may be considered as an output or load winding, and the entire winding l6 between the leads I1 and I8 may be termed an intermediate winding.
  • the magnetic core III is provided with a high leakage reactance path between the windings l3 and it which in the form shown comprises the central leg l2b of the E-shaped laminations and which terminates short of the core bar I l thereby providing a non-magnetic or air gap between 20 said leg l2b and the core bar I I.
  • is connected by leads 22 across the terminals I1 and 18 of the winding IS.
  • the lead II forms one side and the tap IS the other side of what may be termed an output or load circuit.
  • an auxiliary winding 23 is positioned over the winding 13 and is magnetically coupled therewith, the terminals 24 of said winding 23 being connected in series in the lead IQ of said output circuit.
  • Figs. 3 and 4 I have illustrated my invention in connection with a well-known shell type of transformer having two closed magnetic circuits Ill and la comprising a straight central core bar 25 of I-shaped laminations, the sides of which are in abutting contact with the end legs 26a of the E-shaped laminations 26 and the end legs 21a of the E-shaped laminations 21, said parts being held in operative relation by any suitable means.
  • I On the end portion A, of the core 0 bar 25, I have mounted a primary winding 28 the terminals 29 and 30 of which are adapted to be connected to a source of alternating current, the voltage of which may fluctuate substantially from time to time.
  • is positioned on the end portion B of the core bar 25, the winding 3
  • a condenser 32 is connected across the terminals 33 and 34 of the winding 3i.
  • Another winding 35 is mounted on the end portion B of the core bar 25, in the arrangement shown the winding 35 being positioned over and magnetically coupled tightly with the winding 3
  • the terminal 36 of the winding 35 leads to one side of what may 5 be termed an output circuit.
  • An auxiliary winding 31 is positioned on the end portion A of the core bar 28 and in the arrangement illustrated the winding 31 is positioned over and magnetically coupled tightly with the winding 28.
  • a lead 38 connects the winding .31 in series with the winding 35, the lead 39 of the winding 31 forming the other side of the aforesaid output circuit.
  • the winding 35 may be termed an output or load winding and the winding 3
  • the closed magnetic circuits described are each provided with a high leakage reactance path between the windings 28 and 31 on the end portion A of the core bar 25 and the windings 3
  • terminate short of the adjacent sides of the core bar 25 thereby providing non-magnetic or air gaps 42 and 43 between the legs 40 and 4
  • V0 represents the voltage across the output cucumv, shows the input voltage on the primary winding, V; indicates the voltage derived from the winding l8 between the lead l1 and tap l3,'and from the winding 35 forming parts of the respective output circuits, and Vpa is the component 0! the output voltage taken across the terminals of the auxiliary winding 23 or 31, as the case may be.
  • Fig. 5 I have shown the vector relations of the various voltages in either arrangement at a certain power output and at diflerent values of primary voltage.
  • the various voltages are either not primed or are primed to correspond to the difierent values of V, which is varied.
  • V is nearly 180 out of phase with V, and hence the vectorial sum V0 of the two is approximately their numerical diflference.
  • f is the frequency of the voltage impressed on the primary winding 28
  • L is the effective inductance of the winding 3
  • C is the capacity of the condenser 32.
  • a definite amount of current will fiow in the resonant circuit, comprising the winding 3
  • the aforesaid resonant circuit therefore, becomes a constant primary source of voltage for any winding such as the winding 35 that is directly coupled to the winding 3
  • This coupling can be effected in any desired way, for example, by means of an auto-type transformer arrangement as shown in Fig. 2, or by mounting the winding 35 over the winding 3
  • the output voltage of the windings 35 will also have a practically constant level voltage independent of the voltage variation in the primary winding 28 so long as the circuit which includes the winding 3
  • the auxiliary regulating winding 31 is coupled to the portion A of the core and is used to change the percentage of regulation of V0 across the terminals 36 and 39 of the output circuit with a variation of V Since this auxiliary winding 31 on core portion A is directly coupled to the primary winding 28, the voltage induced will always be proportional to the turns ratio of primary winding 28 and the auxiliary winding 31.
  • a very constant level of voltage V. across the terminals 36 and 39 may be obtained by suitably apportioning the number of turns of said auxiliary winding 31 in relation to the number of turns in the winding 35. Any percentage of regulation of output voltage in relation to varia-. tions of V9 also may be obtained from terminals 36 and 89,-for example, an increase in the primary voltage on winding 28 will produce a decrease in output voltage V by properly arranging or apportioning winding 31 in relation to the winding 35.
  • the primary' winding electrically connected to the source serves to induce voltage to the resonant circuit which is separated from the primary circuit by a high leakage reactance path, thereby providing a low co-eflicient of coupling between the primary and the resonant circuits.
  • the aforesaid resonant circuit may be considered as the primary or main source of controlling energy to the winding 35 and hence'to the output or consuming circuit of the transformer.
  • My improved constant potential transformers are compact and efiicient, and are of a small size relative to their power output as compared with other and more cumbersome and expensive apparatus intended for the same purpose.
  • My improved transformers operate at an inherent high power factor, and the output voltage is very close to a pure sine wave.
  • My improved transformers may be used for many diflerent purposes. They are particularly advantageous in connection with commercial applications such as amplifiers for talking motion pictures, amplifiers for radio transmitters, mercury arc lamps, X-ray apparatus, etc.
  • a constant potential transformer the combination of a magnetic core, a winding on said core adapted to be connected to a source of alternating current of fluctuating voltage, a second winding on said core, said core providing a high leakage reactance path for a portion of the fiux to thread through one of the windings to the exclusion of the other winding, and means for maintaining the potential across the second winding substantially constant regardless of fluctuations in the input voltage comprising a resonant circuit including said second winding and a condenser, the resonant circuit operating at a frequency equal to the frequency of the voltage impressed on the first winding.
  • a. constant potential transformer the combination of a magnetic core, a winding on said core adapted to be connected to a source of alternating current of fluctuating voltage, a second winding on said core in spaced relation to said first winding, said core having magnetically disposed between said windings a magnetically permeable shunt with a non-magnetic gap portion, and means for maintaining the potential across the second winding substantially constant regardless of fluctuations in the input voltage comprising a resonant circuit including said second winding and a condenser, the resonant circuit operating at a frequency equal to the frequency of the voltage impressed on the first winding.
  • a closed magnetic circuit comprising first and second core portions, a winding on said first core portion adapted to be connected to a source of alternating current of fluctuating voltage, a second winding on said second core portion, said circuit providing a high leakage reactance path for a portion of the flux to thread through one of the windings to the exclusion of the other winding, and means for maintaining the potential across the second winding substantially constant regardless of fluctuations in the input voltage comprising a resonant circuit including said second winding and a condenser, the resonant circuit operating at a frequency equal to the frequency of the voltage impressed on the first winding, the magnetic density at maximum predetermined input voltage of the first core portion being less than the maximum magnetic density of the second core portion.
  • a closed magnetic circuit comprising first and second core portions, a winding on said first core portion adapted to be connected to a source of alternating current of fiuctuating voltage, a second winding on said second core portion in spaced relation to said first winding, said circuit having magnetically disposed between said windings a magnetically permeable shunt with a non-magnetic gap portion, and means for maintaining the potential across the second winding substantially constant regardless of fluctuations in the input voltage comprising a resonant circuit including said second winding and a condenser, the resonant circuit operating at a frequency equal to the frequency of the voltage impressed on the first winding, the magnetic density at maximum predetermined input voltage of the first core portion being less than the maximum magnetic density of the second core portion.
  • a constant potential transformer comprising in combination a magnetic core, a primary winding on said core adapted to be connected to a source of alternating current of fiuctuating voltage, a load winding on said core adapted to be connected to an output circuit, said core providing a high leakage reactance path for a portion of the flux to thread through one of the windings to the and means for maintaining the potential across the load winding substantially constant regardless of fluctuations in the input voltage comprising a resonant circuit including a condenser and a third winding, the resonant circuit operating at a frequency equal to the frequency of the voltage impressed on the primary winding, the third winding being in inductive relation to the load winding.
  • a constant potential transformer comprising in combination a magnetic core, a primary winding on said core adapted to be connected to a exclusion of the other winding,
  • a constant potential transformer comprising in combination a magnetic core; a primarywinding on said core adapted to be connected to a source of alternating current of fluctuating voltage, a load winding on said core adapted to be connected to an output circuit, said core providing a high leakage reactance path for a portion of the flux to thread through one of the windings to the exclusion of the other winding, a resonant circuit on said first core portion adapted to be connected to a source of alternating current of fluctuating voltage, a load winding on said second core portion and adapted to be connected to an output circuit, said core having magnetically disposed between said windings a magnetically permeable shunt with a non-magnetic gap portion, a resonant circuit including a condenser and a third winding, the resonant circuit operating at a frequency equal to the frequency of the voltage impressed on the primary winding, the third winding being in inductive relation to the load winding, and an auxiliary winding'on'said first core portion in
  • a constant potential transformer comprising in combination a magnetic core, a primary winding on said core adapted to be connected to a source of alternating current of fluctuating voltage, a second winding on said core provided with two leads and an intermediate tap, one of said leads and said tap leading to an output circuit, said core providing a high leakage reactance path for a portion of the flux tothread through one of the windings to the exclusion of the other winding, and means for maintaining insaid output circuit a substantially constant potential regardless of fluctuations in the input voltage comprising a resonant circuit including a condenser connected in series between the leads of said second winding, the resonant circuit operating at a frequency equal to the frequency of the voltage impressed on the primary winding.
  • a constant potential trans former comprising in combination a magnetic core; aprimary winding on said core adapted to be connected to a source of alternating current of fluctuating voltage; a second winding on said core provided with two leads and an intermediate tap; said core having magnetically disposed between said windings a magnetically permeable shunt with a taining in said output circuit a substantially constant potential comprising a resonant circuit ineluding a condenser connected in series between the leads of the second winding, the resonant circuit operating at a frequency equal to the frequency of the voltage impressed on the primary winding, and an auxiliary winding on said core in inductive relation to the primary winding and in series with the load winding.
  • a constant potential transformer comprising in combination a closed magnetic core comprising first and second core portions; a primary winding on said first core portion adapted to be connected to a source of alternating current of fluctuating voltage; a second winding on the second core portion and provided with two leads and an intermediate tap; one of said leadsand saidtap leading to an output circuit; said core having magnetically disposed between said windings a magnetically permeable shunt with a non-magnetic gap portion; the maximum density at maximum predetermined input voltage of said first core portion being less than the maximum density of said second core portion; and means for maintaining in said output circuit a substantially constant potential comprising a resonant circuit ineluding a condenser connected in series between the leads of the second winding, the resonant circuit operating at a frequency equal to the frequency of the voltage impressed on the primary winding, and an auxiliary winding on said core in inductive relation to the primary winding and in series with the load winding.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Dc-Dc Converters (AREA)
US227626A 1938-08-31 1938-08-31 Constant potential transformer Expired - Lifetime US2143745A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL72460D NL72460C (enrdf_load_stackoverflow) 1938-08-31
BE435925D BE435925A (enrdf_load_stackoverflow) 1938-08-31
US227626A US2143745A (en) 1938-08-31 1938-08-31 Constant potential transformer
GB16005/39A GB529420A (en) 1938-08-31 1939-05-31 Constant potential transformer
FR856672D FR856672A (fr) 1938-08-31 1939-06-20 Transformateur à potentiel constant
DES4146D DE930885C (de) 1938-08-31 1939-09-01 In einer elektrischen Stromverteilungsanlage angeordnete Einrichtung zur Konstanthaltung der Verbraucherspannung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US227626A US2143745A (en) 1938-08-31 1938-08-31 Constant potential transformer

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US2143745A true US2143745A (en) 1939-01-10

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US227626A Expired - Lifetime US2143745A (en) 1938-08-31 1938-08-31 Constant potential transformer

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US (1) US2143745A (enrdf_load_stackoverflow)
BE (1) BE435925A (enrdf_load_stackoverflow)
DE (1) DE930885C (enrdf_load_stackoverflow)
FR (1) FR856672A (enrdf_load_stackoverflow)
GB (1) GB529420A (enrdf_load_stackoverflow)
NL (1) NL72460C (enrdf_load_stackoverflow)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432343A (en) * 1945-02-01 1947-12-09 Gen Electric Electromagnetic induction apparatus
US2434493A (en) * 1945-02-17 1948-01-13 Gen Electric Voltage stabilizing transformer
US2448925A (en) * 1946-03-21 1948-09-07 Chicago Title And Trust Compan Motor system using voltage regulating transformer
US2488742A (en) * 1947-03-06 1949-11-22 Essex Wire Corp Transformer
US2603771A (en) * 1948-11-01 1952-07-15 Philip J Walsh Magnetic trigger system
US2694177A (en) * 1951-03-16 1954-11-09 Joseph G Sola Transformer having constant and harmonic free output voltage
US2753513A (en) * 1953-11-06 1956-07-03 Joseph G Sola Transformers
US2801349A (en) * 1954-08-12 1957-07-30 Sola Electric Co Voltage stabilizing and control apparatus
US2996656A (en) * 1959-02-02 1961-08-15 Basic Products Corp Voltage regulating apparatus
US3022458A (en) * 1959-05-29 1962-02-20 Joseph G Sola Voltage regulating apparatus
US3054939A (en) * 1958-12-24 1962-09-18 Ibm Regulated power supply
US3061769A (en) * 1960-04-14 1962-10-30 Technical Operations Inc Electric wave converter
US3117274A (en) * 1960-07-29 1964-01-07 Ibm Power supply with protective circuits
US3148326A (en) * 1959-12-24 1964-09-08 Ibm Ferroresonant transformer with saturating control winding
DE1186142B (de) * 1961-05-09 1965-01-28 Frako Kondensatoren Und Appbau Einrichtung zur Konstanthaltung einer elektrischen Verbraucherspannung
DE1188202B (de) * 1962-07-06 1965-03-04 Cons Electrodynamics Corp Schaltungsanordnung zum Zuenden und zum Betrieb einer aus einem Wechselstromnetz gespeisten Hochdruck-Gasentladungslampe
DE1202397B (de) * 1962-10-26 1965-10-07 Iwasaki Electric Co Ltd Schaltungsanordnung zum Zuenden und zum Betrieb einer Hochdruckentladungslampe
US3237089A (en) * 1961-06-21 1966-02-22 Lambda Electronics Corp Means for improving constant voltage transformers
US3435318A (en) * 1966-03-02 1969-03-25 Dynamic Instr Corp Safety battery charger
DE1295080B (de) * 1962-07-27 1969-05-14 Berkey Photo Inc Eine Ges Des Schaltungsanordnung zum Impulsbetrieb von Gasentladungslampen
US3447068A (en) * 1966-12-20 1969-05-27 Bell Telephone Labor Inc Single core series-shunt ferroresonant voltage regulator with easily altered gap
US3454868A (en) * 1961-09-21 1969-07-08 Frako Kondensator Apparate Constant potential transformer
US3548292A (en) * 1966-12-24 1970-12-15 Dominitwerke Gmbh Single core magnetic voltage regulator
US4357587A (en) * 1980-02-14 1982-11-02 Wilfried Ernst Sawatzky Core laminations, particularly for transformers
US4361823A (en) * 1979-05-19 1982-11-30 Wilfried Ernst Sawatzky Core laminations for shell-type cores, especially for transformers
US4365224A (en) * 1977-10-25 1982-12-21 Wilfried Ernst Sawatsky Core lamination for shell-type cores, particularly for transformers
US5587892A (en) * 1994-10-04 1996-12-24 Delco Electronics Corp. Multi-phase power converter with harmonic neutralization
US5594632A (en) * 1994-10-03 1997-01-14 Delco Electronics Corporation Power converter with harmonic neutralization
US5625543A (en) * 1994-10-04 1997-04-29 Delco Electronics Corp. Power converter with harmonic neutralization
US5668707A (en) * 1994-10-04 1997-09-16 Delco Electronics Corp. Multi-phase power converter with harmonic neutralization
US5737203A (en) * 1994-10-03 1998-04-07 Delco Electronics Corp. Controlled-K resonating transformer
US11206722B2 (en) 2017-09-01 2021-12-21 Trestoto Pty Limited Lighting control circuit, lighting installation and method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1112783B (de) * 1955-10-03 1961-08-17 Basic Products Corp Elektrisches Energieversorgungsgeraet mit einem Transformator und nachgeschaltetem Kondensator
DE1156163B (de) * 1957-11-21 1963-10-24 Bert K Naster Elektromagnetischer Spannungskonstanthalter mit einem ersten und einem zweiten Transformator
US2985817A (en) * 1958-01-07 1961-05-23 Engelhard Hanovia Inc Automatic voltage regulating circuit
DE1246121B (de) * 1964-04-10 1967-08-03 Frako Kondensatoren Und Appbau Vorschaltgeraet fuer Gasentladungslampen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH180783A (de) * 1933-07-25 1935-11-15 Siemens Ag In einer elektrischen Stromverteilungsanlage angeordnete Einrichtung zur Konstanthaltung der Verbraucherspannung trotz schwankender Netzspannung.

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432343A (en) * 1945-02-01 1947-12-09 Gen Electric Electromagnetic induction apparatus
US2434493A (en) * 1945-02-17 1948-01-13 Gen Electric Voltage stabilizing transformer
US2448925A (en) * 1946-03-21 1948-09-07 Chicago Title And Trust Compan Motor system using voltage regulating transformer
US2488742A (en) * 1947-03-06 1949-11-22 Essex Wire Corp Transformer
US2603771A (en) * 1948-11-01 1952-07-15 Philip J Walsh Magnetic trigger system
US2694177A (en) * 1951-03-16 1954-11-09 Joseph G Sola Transformer having constant and harmonic free output voltage
US2753513A (en) * 1953-11-06 1956-07-03 Joseph G Sola Transformers
US2801349A (en) * 1954-08-12 1957-07-30 Sola Electric Co Voltage stabilizing and control apparatus
US3054939A (en) * 1958-12-24 1962-09-18 Ibm Regulated power supply
US2996656A (en) * 1959-02-02 1961-08-15 Basic Products Corp Voltage regulating apparatus
US3022458A (en) * 1959-05-29 1962-02-20 Joseph G Sola Voltage regulating apparatus
US3148326A (en) * 1959-12-24 1964-09-08 Ibm Ferroresonant transformer with saturating control winding
US3061769A (en) * 1960-04-14 1962-10-30 Technical Operations Inc Electric wave converter
US3117274A (en) * 1960-07-29 1964-01-07 Ibm Power supply with protective circuits
DE1186142B (de) * 1961-05-09 1965-01-28 Frako Kondensatoren Und Appbau Einrichtung zur Konstanthaltung einer elektrischen Verbraucherspannung
US3237089A (en) * 1961-06-21 1966-02-22 Lambda Electronics Corp Means for improving constant voltage transformers
US3454868A (en) * 1961-09-21 1969-07-08 Frako Kondensator Apparate Constant potential transformer
DE1188202B (de) * 1962-07-06 1965-03-04 Cons Electrodynamics Corp Schaltungsanordnung zum Zuenden und zum Betrieb einer aus einem Wechselstromnetz gespeisten Hochdruck-Gasentladungslampe
DE1295080B (de) * 1962-07-27 1969-05-14 Berkey Photo Inc Eine Ges Des Schaltungsanordnung zum Impulsbetrieb von Gasentladungslampen
DE1202397B (de) * 1962-10-26 1965-10-07 Iwasaki Electric Co Ltd Schaltungsanordnung zum Zuenden und zum Betrieb einer Hochdruckentladungslampe
US3435318A (en) * 1966-03-02 1969-03-25 Dynamic Instr Corp Safety battery charger
US3447068A (en) * 1966-12-20 1969-05-27 Bell Telephone Labor Inc Single core series-shunt ferroresonant voltage regulator with easily altered gap
US3548292A (en) * 1966-12-24 1970-12-15 Dominitwerke Gmbh Single core magnetic voltage regulator
US4365224A (en) * 1977-10-25 1982-12-21 Wilfried Ernst Sawatsky Core lamination for shell-type cores, particularly for transformers
US4361823A (en) * 1979-05-19 1982-11-30 Wilfried Ernst Sawatzky Core laminations for shell-type cores, especially for transformers
US4357587A (en) * 1980-02-14 1982-11-02 Wilfried Ernst Sawatzky Core laminations, particularly for transformers
US5594632A (en) * 1994-10-03 1997-01-14 Delco Electronics Corporation Power converter with harmonic neutralization
US5737203A (en) * 1994-10-03 1998-04-07 Delco Electronics Corp. Controlled-K resonating transformer
US5587892A (en) * 1994-10-04 1996-12-24 Delco Electronics Corp. Multi-phase power converter with harmonic neutralization
US5625543A (en) * 1994-10-04 1997-04-29 Delco Electronics Corp. Power converter with harmonic neutralization
US5668707A (en) * 1994-10-04 1997-09-16 Delco Electronics Corp. Multi-phase power converter with harmonic neutralization
US11206722B2 (en) 2017-09-01 2021-12-21 Trestoto Pty Limited Lighting control circuit, lighting installation and method

Also Published As

Publication number Publication date
FR856672A (fr) 1940-08-01
BE435925A (enrdf_load_stackoverflow)
GB529420A (en) 1940-11-20
DE930885C (de) 1955-07-28
NL72460C (enrdf_load_stackoverflow)

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