US3889175A — Driving device for thyristor type ac-dc converter

Claim 1

Independent Claim 139 words

A driving device for a thyristor type AC-DC converter, comprising at least one insulating cylinder having a plurality of conductive layers constituting a capacitor formed therein and near at least one end thereof disposed nearer the high voltage terminal of said device, the innermost one of said conductive layers being extended midway of said cylinder; a primary conductor passing through said insulating cylinder at the center thereof and connected with a pulse generator; and a plurality of transformer units stacked one upon another and arranged in skewered condition on said insulating cylinder, each said unit having a magnetic core with a plurality of secondary windings wound thereabout which windings supply gating voltages for the gates of thyristors connected in series, wherein said innermost conductive layer is electrically insulated from said primary conductor and grounded toward said high voltage terminal.

Claim 2

Dependent Claim 139 words

A driving device for a thyristor type AC-DC converter, comprising at least one insulating cylinder having a plurality of conductive layers constituting a capacitor formed therein and near at least one end thereof disposed nearer the high voltage terminal of said device, the innermost one of said conductive layers being extended midway of said cylinder; a primary conductor passing through said insulating cylinder at the center thereof and connected with a pulse generator; and a plurality of transformer units stacked one upon another and arranged in skewered condition on said insulating cylinder, each said unit having a magnetic core with a plurality of secondary windings wound thereabout which windings supply gating voltages for the gates of thyristors connected in series, wherein said innermost conductive layer is electrically insulated from said primary conductor and grounded toward said high voltage terminal.

Claim 3

Dependent Claim 147 words

A driving device for a thyristor type AC-DC converter, comprising a pair of parallel disposed insulating cylinders, each having therein a pair of capacitors, each capacitor being disposed near the end of said insulating cylinder and having a plurality of coaxially disposed conductive layers whose axial lengths decrease toward the outer surface of said insulating cylinder, and the innermost conductors of said capacitors being axially separated from each other and grounded only near the ends of said insulating cylinder; a primary conductor passiNg through said insulating cylinders at the centers thereof and connected with a pulse generator; and a plurality of transformer units stacked one upon another and arranged in skewered condition on each of said insulating cylinders, each transformer unit having a magnetic core with a plurality of secondary windings wound thereabout which windings supply gating voltages for the gates of the thyristors connected in series.

Claim 4

Dependent Claim 147 words

A driving device for a thyristor type AC-DC converter, comprising a pair of parallel disposed insulating cylinders, each having therein a pair of capacitors, each capacitor being disposed near the end of said insulating cylinder and having a plurality of coaxially disposed conductive layers whose axial lengths decrease toward the outer surface of said insulating cylinder, and the innermost conductors of said capacitors being axially separated from each other and grounded only near the ends of said insulating cylinder; a primary conductor passiNg through said insulating cylinders at the centers thereof and connected with a pulse generator; and a plurality of transformer units stacked one upon another and arranged in skewered condition on each of said insulating cylinders, each transformer unit having a magnetic core with a plurality of secondary windings wound thereabout which windings supply gating voltages for the gates of the thyristors connected in series.

Claim 5

Dependent Claim 58 words

A driving device for a thyristor type AC-DC converter as claimed in claim 2, wherein the secondary windings of the transformer units of one of said insulating cylinders and the secondary windings of the transformer units of the other insulating cylinder are connected alternatively with the series-connected thyristors of said converter to control the gates of said thyristors.

Claim 6

Dependent Claim 199 words

A driving device for a thyristor type AC-DC converter, comprising at least two insulating cylinders, each having therein two capacitors separated axially of said insulating cylinder from each other, each of said capacitor consisting of a plurality of coaxial conductive layers; a primary conductor passing through said insulating cylinders at the centers thereof and connected with a pulse generator; a plurality of transformer units stacked one upon another and arranged in skewered condition on each of said insulating cylinders, each transformer unit having a magnetic core with a plurality of secondary windings wound thereabout which windings supply gating voltages for the gates of the thyristors connected in series; a pair of first means each of which is disposed near the uppermost transformer unit of each insulating cylinder for conducting a surge current flowing in through the terminal of said converter radially from outside the core of said uppermost transformer unit to the outermost conductive layer of the correspondng capacitor of said insulating cylinder; and a pair of second means each of which serves to cancel the magnetic flux generated due to said surge current, through the transformer units of each insulating cylinder near the path of said surge current.

Claim 7

Dependent Claim 199 words

A driving device for a thyristor type AC-DC converter, comprising at least two insulating cylinders, each having therein two capacitors separated axially of said insulating cylinder from each other, each of said capacitor consisting of a plurality of coaxial conductive layers; a primary conductor passing through said insulating cylinders at the centers thereof and connected with a pulse generator; a plurality of transformer units stacked one upon another and arranged in skewered condition on each of said insulating cylinders, each transformer unit having a magnetic core with a plurality of secondary windings wound thereabout which windings supply gating voltages for the gates of the thyristors connected in series; a pair of first means each of which is disposed near the uppermost transformer unit of each insulating cylinder for conducting a surge current flowing in through the terminal of said converter radially from outside the core of said uppermost transformer unit to the outermost conductive layer of the correspondng capacitor of said insulating cylinder; and a pair of second means each of which serves to cancel the magnetic flux generated due to said surge current, through the transformer units of each insulating cylinder near the path of said surge current.

Claim 8

Dependent Claim 66 words

A driving device for a thyristor type AC-DC converter as claimed in claim 4, wherein each of said first means comprises a conductor disposed above the uppermost transformer unit of the corresponding insulating cylinder and connected with the terminal of said converter and a plurality of lead wires to connect said conductor with the outermost conductive layer of the capacitor opposite to said uppermost transformer unit.

Claim 9

Dependent Claim 95 words

A driving device for a thyristor type AC-DC converter as claimed in claim 4, wherein each of said first means comprises a horn-shaped conductor disposed above the uppermost transformer unit of the corresponding insulating cylinder, the large-diameter periphery of said horn-shaped conductor extending outward beyond the periphery of said uppermost transformer unit; a means for connecting said large-diameter periphery of said horn-shaped conductor with the terminal of said converter; and a means for connecting the small-diameter periphery of said horn-shaped conductor with the outermost conductor layer of the capacitor corresponding to said uppermost transformer unit.

Claim 10

Dependent Claim 73 words

A driving device for a thyristor type AC-DC converter as claimed in claim 2, wherein each of said transformer units comprises at least a pair of compensating windings wound about its core in diametrically opposite relation to each other and differentially connected with each other; a conducting shield surrounding said differential windings inclusive of their differential connection part; and secondary windings wound about said conducting shield with a desired insulating layer coated thereon.

Claim 11

Dependent Claim 35 words

A driving device for a thyristor type AC-DC converter as claimed in claim 7, wherein the secondary windings of each transformer unit are disposed in the vicinity of one of said pair of compensating windings.

Claim 12

Dependent Claim 100 words

A driving device for a thyristor type AC-DC converter as claimed in claim 2, wherein each of said transformer units comprises at least a pair of compensating windings wound about its core in diametrically opposite relation to each other and differentially connected with each other; a differential winding wound about said core and connected differentially with the differential winding of the corresponding transformer unit; a conducting shield surrounding said compensating windings and said differential winding, inclusive of the differential connection part of said compensating windings; and secondary windings wound about said conducting shield with a desired insulating layer coated thereon.

Claim 13

Dependent Claim 164 words

A driving device for a thyristor type AC-DC converter, comprising at least one insulating cylinder having a plurality of conductive layers disposed coaxially near each of upper and lower ends thereof and constituting a capacitor formed therein, said conductive layers having different axial lengths decreasing from the innermost to outermost layer thereof, said innermost layer being extended midway of said cylinder; a primary conductor passing through said insulating cylinder at the center thereof and connected with a pulse generator; and a plurality of transformer units stacked one upon another and arranged in skewered condition on said insulating cylinder, each said unit having a magnetic core with a plurality of secondary windings wound thereabout which windings supply gating voltages for the gates of thyristors connected in series, wherein said innermost conductive layers are electrically insulated from said primary conductor, isolated in the axial direction from each other at a predetermined distance, and grounded axially outside said insulating cylinder through respective ends of the insulating cylinder.

Claim 14

Dependent Claim 164 words

A driving device for a thyristor type AC-DC converter, comprising at least one insulating cylinder having a plurality of conductive layers disposed coaxially near each of upper and lower ends thereof and constituting a capacitor formed therein, said conductive layers having different axial lengths decreasing from the innermost to outermost layer thereof, said innermost layer being extended midway of said cylinder; a primary conductor passing through said insulating cylinder at the center thereof and connected with a pulse generator; and a plurality of transformer units stacked one upon another and arranged in skewered condition on said insulating cylinder, each said unit having a magnetic core with a plurality of secondary windings wound thereabout which windings supply gating voltages for the gates of thyristors connected in series, wherein said innermost conductive layers are electrically insulated from said primary conductor, isolated in the axial direction from each other at a predetermined distance, and grounded axially outside said insulating cylinder through respective ends of the insulating cylinder.

Claim 15

Dependent Claim 84 words

A driving device for a thyristor type AC-DC converter as claimed in claim 10, wherein said transformer units of said insulating cylinder are equally divided into an upper group and a lower group, the transformer units belonging to said upper group being placed electrostatically opposite to said innermost conductive layer of said upper end of said insulating cylinder, and the transformer units belonging to said lower group being placed electrostatically opposite to said innermost conductive layer of said lower end of said insulating cylinder.

Claim 16

Dependent Claim 31 words

A driving device for a thyristor type AC-DC converter as claimed in claim 11, wherein each of said outermost conductive layers is disposed closely near the end of said insulating cylinder.

Claim 17

Dependent Claim 59 words

A driving device for a thyristor type AC-DC converter as claimed in claim 10, wherein the axial ends, near the midway of said insulating cylinder, of said conductive layers of each capacitor are terminated at a predetermined axial distance with each other so that each said transformer unit may be placed opposite to corresponding one of said conductive layers.

Claim 18

Dependent Claim 66 words

A driving device for a thyristor type AC-DC converter as claimed in claim 10, wherein said transformer units of said insulating cylinder are equally divided into two groups substantially midway of said insulating cylinder, the transformer units belonging to each group being equidistantly apart from each other, and the interval between two transformer units belonging to each group is smaller than that between said two groups.

Claim 19

Dependent Claim 70 words

A driving device for a thyristor type AC-DC converter as claimed in claim 10, wherein the outermost conductive layer of one of said capacitors in said insulating cylinder is connected with the input terminal of the thyristor main circuit consisting of said series-connected thyristors while the outermost conductive layer of the other of said capacitors in said insulating cylinder is connected with the output terminal of said thyristor main circuit.

Claim 20

Dependent Claim 110 words

A driving device for a thyristor type AC-DC converter as claimed in claim 10, wherein a conducting shield for electrostatic shielding is provided for each said transformer unit, said conducting shield being Disposed at least in a portion within said transformer unit opposite to said insulating cylinder so as to shield the secondary windings of said unit, the conducting shield of the uppermost one of said transformer units being connected to said outermost conductive layer of said upper end of said insulating cylinder, and the conducting shield of the lowermost one of said transformer units being connected to said outermost conductive layer of said lower end of said insulating cylinder.

Claim 21

Dependent Claim 93 words

A driving device for a thyristor type AC-DC converter as claimed in Claim 16, wherein the conducting shields of said uppermost and lowermost transformer units are connected respectively with the junction point between the two extreme thyristors nearest the input terminal of said thyristor main circuit and the junction point between the two extreme thyristors nearest the output terminal of said thyristor main circuit, and the outermost conductive layers of said upper and lower ends of said insulating cylinder are connected respectively with said input and output terminals of said thyristor main circuit.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-06-09	1978-12-09	1979-06-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-06-09	1982-12-09	1983-06-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-06-09	1986-12-09	1987-06-10	$7700.00	Window Closed / Lapsed

Driving device for thyristor type ac-dc converter

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