US3579088A — Ferroresonant transformer with controllable flux

Claim 1

Independent Claim 86 words

A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; a control winding on one of said sections; and switch means for opening and closing a circuit across said control winding, with no current source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said one section.

Claim 2

Dependent Claim 86 words

A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; a control winding on one of said sections; and switch means for opening and closing a circuit across said control winding, with no current source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said one section.

Claim 3

Dependent Claim 25 words

2. A ferroresonant transformer as defined in claim 1 wherein the core structure includes an opening therethrough, with said two sections forming opposite walls thereof.

Claim 4

Dependent Claim 30 words

A ferroresonant transformer as defined in claim 1 wherein said core structure includes stacked E and I laminations, with said two sections comprising the outer legs of the E laminations.

Claim 5

Dependent Claim 39 words

A ferroresonant transformer as defined in claim 1 wherein said core structure includes at least two groups of stacked E and I laminations, with said two sections comprising the center legs of two different groups of said stacked laminations.

Claim 6

Dependent Claim 26 words

A ferroresonant transformer as defined in claim 1 wherein said core structure is formed of a plurality of toroids, with said two sections comprising separate toroids.

Claim 7

Dependent Claim 50 words

A ferroresonant transformer as defined in claim 1 wherein said core structure includes three sets of stacked E and I laminations assembled side by side, with the center set inverted with respect to the outer sets, and with said two sections comprising the center legs of the outer sets, respectively.

Claim 8

Dependent Claim 93 words

A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; a control winding on one of said sections; and switch means for opening and closing a circuit across said control winding as a function of the secondary voltage, with no currEnt source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said one section.

Claim 9

Dependent Claim 93 words

A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; a control winding on one of said sections; and switch means for opening and closing a circuit across said control winding as a function of the secondary voltage, with no currEnt source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said one section.

Claim 10

Dependent Claim 16 words

A ferroresonant transformer as defined in claim 7 wherein said switch means includes a synchronized oscillator.

Claim 11

Dependent Claim 16 words

A ferroresonant transformer as defined in claim 7 wherein said switch means includes a phase shifter.

Claim 12

Dependent Claim 16 words

A ferroresonant transformer as defined in claim 7 wherein said switch means includes a saturable reactor.

Claim 13

Dependent Claim 22 words

A ferroresonant transformer as defined in claim 7 wherein said switch means provides for switching operation every half-cycle of the supply voltage.

Claim 14

Dependent Claim 22 words

A ferroresonant transformer as defined in claim 7 wherein said switch means provides for switching operation every cycle of the supply voltage.

Claim 15

Dependent Claim 57 words

A ferroresonant transformer as defined in claim 7 including rectifier means connected across the secondary winding for producing a DC control signal voltage; and said switch means includes a switch element and a control circuit having said control signal voltage as an input for closing said switch element when said control signal voltage exceeds a predetermined magnitude.

Claim 16

Dependent Claim 60 words

A ferroresonant transformer as defined in claim 13 in which said control circuit includes an integrator connected for charging from said control winding, and a trigger unit having the integrator output and said control signal voltage as inputs with said trigger unit actuating said switch element at least once each cycle of the supply voltage connected to the primary winding.

Claim 17

Dependent Claim 18 words

A ferroresonant transformer as defined in claim 14 in which said integrator comprises a resistor and capacitor circuit.

Claim 18

Dependent Claim 20 words

A ferroresonant transformer as defined in claim 14 in which said integrator comprises an operational amplifier connected as an integrator.

Claim 19

Dependent Claim 140 words

A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; and means for varying the saturation flux capacity in the core structure by switching the secondary and resonant flux between a first condition with flux change occurring in both of said sections and a second condition with substantially all of the flux change occurring in one of said sections, said means for varying including a control winding on the other of said sections, and means for closing and opening a circuit across said control winding, with no current source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said other section.

Claim 20

Dependent Claim 140 words

A ferroresonant transformer including a magnetic core structure, a primary winding and a secondary winding, wherein the core structure with the secondary winding includes two separate sections providing parallel magnetic paths for the secondary and resonant flux; and means for varying the saturation flux capacity in the core structure by switching the secondary and resonant flux between a first condition with flux change occurring in both of said sections and a second condition with substantially all of the flux change occurring in one of said sections, said means for varying including a control winding on the other of said sections, and means for closing and opening a circuit across said control winding, with no current source connected to said control winding whereby the only current in said control winding is self induced current resulting from flux in said other section.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-05-17	1974-11-16	1975-05-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-05-17	1978-11-16	1979-05-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-05-17	1982-11-16	1983-05-18	$7700.00	Window Closed / Lapsed

Ferroresonant transformer with controllable flux

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