Demagnetizer, solid state

Claim 2

Solid state demagnetizing means comprising a circuit adapted to be connected with an electrical source and with an object to be demagnetized, the circuit including means for applying DC to the object and for applying it in successive steps of opposite polarity, a first condenser of fixed maximum capacity constantly chargeable and substantially instantaneously charged by the source, a second condenser relatively slowly and progressively chargeable by the source, and adjustable through a range of maximum capacity extending above and below that of the first condenser, and means responsive to and controlled by the first condenser operative, when the second condenser is charged to a value less than that of the first condenser, for effecting application of DC of a first polarity to the object, means responsive to and controlled by the second condenser operative, when it is charged to a value greater than that of the first condenser, for effecting application of DC of the opposite polarity to the object, and means for reducing the value of the voltage applied to the object during the reversals of polarity as controlled by the first and second condensers.

Claim 3

Demagnetizing means according to claim 1 and including a first and a second transistors related to the condensers, the condensers respectively controlling the transistors by rendering the corresponding transistor conducting and the other nonconducting, and each condenser being operative for so controlling the respective transistor upon its predominance over the other, and the transistors operative for controlling the application of DC of respective opposite polarities to the object.

Claim 4

Demagnetizing means according to claim 2 and including first and second SCR''s related to and controlled by the first and second transistors, and transformer means controlled by the SCR''s and themselves controlling the application of DC to the object.

Claim 5

A demagnetizing means according to claim 1 adapted for connection with an AC source and wherein each condenser is operative throughout a range including a plurality of AC cycles and the condensers retain their charges throughout a plurality of AC cycles, and the charges decay independently of the AC cycles.

Claim 6

Solid state demagnetizing means comprising a circuit adapted to be connected with an AC source and with an object to be demagnetized, a first charging transformer and rectifier means for effecting DC of a first polarity and imposing it on the object, a second charging transformer and rectifier means for effecting DC of a second polarity and imposing on the object, a first condenser of fixed maximum capacity constantly chargeable and substantially instantaneously charged by source, rectifier means interposed between the source and the first condenser, a second condenser relatively slowly and progressively chargeable by the source, and adjustable through a range of maximum capacity extending above and below that of the first condenser, rectifiers means interposed between the source and the second condenser, means responsive to and controlled by the first condenser operative, when the second condenser is charged to a value less than that of the first condenser, for energizing the first charging transformer and thereby magnetizing the object in the corresponding first polarity, means responsive to and controlled by the second condenser operative, when it is charged to a value greater than that of the first condenser, for energizing the second charging transformer and thereby magnetizing the object in the corresponding opposite polarity, valve means operatively interposed between the condensers and tHe charging transformers, the first condenser during a predetermined value of charge thereon greater than that of the second condenser, being operable for holding the corresponding valve means in the respective conductive condition and the corresponding charging transformer in energized condition for imposing DC of a first polarity of the object, the second condenser during a predetermined value of charge thereon greater than that of the first condenser, being operable for holding the corresponding valve means in the respective conductive condition and the corresponding charging transformer in energized condition for imposing DC of the opposite polarity on the object, and means for reducing the value of the voltage imposed on the object throughout a predetermined range independently of the periods of energization of the condenser means and corresponding energization of the charging transformers.

Claim 7

Solid state demagnetizing means comprising a circuit adapted to be connected with an AC source and with an object to be demagnetized, a first charging transformer and rectifier means for effecting DC of a first polarity and imposing it on the object, a second charging transformer and rectifier means for effecting DC of a second polarity and imposing on the object, a first condenser of fixed maximum capacity constantly chargeable and substantially instantaneously charged by source, rectifier means interposed between the source and the first condenser, a second condenser relatively slowly and progressively chargeable by the source, and adjustable through a range of maximum capacity extending above and below that of the first condenser, rectifiers means interposed between the source and the second condenser, means responsive to and controlled by the first condenser operative, when the second condenser is charged to a value less than that of the first condenser, for energizing the first charging transformer and thereby magnetizing the object in the corresponding first polarity, means responsive to and controlled by the second condenser operative, when it is charged to a value greater than that of the first condenser, for energizing the second charging transformer and thereby magnetizing the object in the corresponding opposite polarity, valve means operatively interposed between the condensers and tHe charging transformers, the first condenser during a predetermined value of charge thereon greater than that of the second condenser, being operable for holding the corresponding valve means in the respective conductive condition and the corresponding charging transformer in energized condition for imposing DC of a first polarity of the object, the second condenser during a predetermined value of charge thereon greater than that of the first condenser, being operable for holding the corresponding valve means in the respective conductive condition and the corresponding charging transformer in energized condition for imposing DC of the opposite polarity on the object, and means for reducing the value of the voltage imposed on the object throughout a predetermined range independently of the periods of energization of the condenser means and corresponding energization of the charging transformers.

Claim 8

Demagnetizing means according to claim 5 wherein the means for reducing the voltage includes additional condenser means chargeable from the AC source, and means for controlling the discharging effect of the additional condenser means and corresponding range of the control of the first mentioned condenser means throughout a predetermined range.

Claim 9

Demagnetizing means according to claim 6 wherein the means for controlling the discharge of the additional condenser means establishes a range of effectiveness thereof greater than the range of discharge of either of the first and second condensers and independently thereof.

Claim 10

Demagnetizing means according to claim 6 wherein the first and second condensers are constantly chargeable by the source, and the circuit includes means normally holding the charging transformers in deenergized condition, and manually controlled means for actuating the means for controlling the discharge of the additional condenser means and thereby energizing the charging transformers.

Claim 11

Demagnetizing means according to claim 8 wherein the period of discharge of the additional condenser means is greater than that of either the first or second condensers.

Claim 12

Demagnetizing means according to claim 9 and including transformer means for energizing the additional condenser means, this last transformer means being utilized also for controlling the charging transformers.

Claim 13

Solid state demagnetizing means including a circuit adapted for connection to an AC source and to an object to be demagnetized, comprising a first condenser of fixed maximum capacity connected with the source, constantly chargeable and substantially instantaneously charged by the source, with rectifier means interposed between the source and the first condenser, a second condenser relatively slowly and progressively chargeable, connected with the source and adjustable through a range of maximum capacity extending above and below that of the first condenser, with rectifier means interposed between the source and the second condenser, a transistor associated with each condenser and controlled thereby, an SCR related to each transistor and controlled thereby, each condenser being operative to energizing its related transistor while deenergizing the opposite transistor and the transistors being correspondingly operative for energizing the corresponding SCR''s when they themselves are energized, transformer means for controlling the object including a main transformer energized directly by the source, and back-to-back transformers related to each of opposite polarities of DC and including associated back-to-back SCR''s directly related to the back-to-back transformers, a first pair of transformers having primaries in series connected with the source and having back-to-back rectifiers therebetween and including secondaries forming parts of the back-to-back transformers associated with the object, a second pair of transformers having primaries in series connected with the source and having back-to-back rectifiers thErebetween and including secondaries forming posts of the back-to-back transformers associated with the object, in the opposite polarity of the DC, conductors respectively center-tapping the first pair of transformer primaries and the second set of transformer primaries, SCR''s connected with the center tappings, additional transformers having primaries controlled by the first mentioned SCR''s and secondaries controlled by the last mentioned SCR''s, and means for controlling the application of DC to the object to be demagnetized including transformer means controlled by the last mentioned SCR''s and including the second and third SCR''s in a subcircuit, the transformers above mentioned being constantly energized under the control of the first and second condensers, throughout a range indeterminate in length, control means for terminating the application of DC to the object to be demagnetized including an additional condenser operative when charged for energizing the last mentioned transformer and thereby energizing the transformer controlling the object to be demagnetized, said additional condenser being constantly charged, and the circuit including means normally disconnecting the additional condenser from the last mentioned transformer, and manually control means for connecting the additional condenser with the last mentioned transformer whereby that transformer is energized throughout the period of decay of the additional condenser and during that period the last mentioned transformer energizes the transformer directly controlling the object to be demagnetized and after the decay of the additional condenser it becomes deenergized and the circuit is opened to the object to be demagnetized, the period of decay of the additional condenser being greater than at least the period of energization of each of the first and second condensers.

Claim 14

Solid state demagnetizing means including a circuit adapted for connection to an AC source and to an object to be demagnetized, comprising a first condenser of fixed maximum capacity connected with the source, constantly chargeable and substantially instantaneously charged by the source, with rectifier means interposed between the source and the first condenser, a second condenser relatively slowly and progressively chargeable, connected with the source and adjustable through a range of maximum capacity extending above and below that of the first condenser, with rectifier means interposed between the source and the second condenser, a transistor associated with each condenser and controlled thereby, an SCR related to each transistor and controlled thereby, each condenser being operative to energizing its related transistor while deenergizing the opposite transistor and the transistors being correspondingly operative for energizing the corresponding SCR''s when they themselves are energized, transformer means for controlling the object including a main transformer energized directly by the source, and back-to-back transformers related to each of opposite polarities of DC and including associated back-to-back SCR''s directly related to the back-to-back transformers, a first pair of transformers having primaries in series connected with the source and having back-to-back rectifiers therebetween and including secondaries forming parts of the back-to-back transformers associated with the object, a second pair of transformers having primaries in series connected with the source and having back-to-back rectifiers thErebetween and including secondaries forming posts of the back-to-back transformers associated with the object, in the opposite polarity of the DC, conductors respectively center-tapping the first pair of transformer primaries and the second set of transformer primaries, SCR''s connected with the center tappings, additional transformers having primaries controlled by the first mentioned SCR''s and secondaries controlled by the last mentioned SCR''s, and means for controlling the application of DC to the object to be demagnetized including transformer means controlled by the last mentioned SCR''s and including the second and third SCR''s in a subcircuit, the transformers above mentioned being constantly energized under the control of the first and second condensers, throughout a range indeterminate in length, control means for terminating the application of DC to the object to be demagnetized including an additional condenser operative when charged for energizing the last mentioned transformer and thereby energizing the transformer controlling the object to be demagnetized, said additional condenser being constantly charged, and the circuit including means normally disconnecting the additional condenser from the last mentioned transformer, and manually control means for connecting the additional condenser with the last mentioned transformer whereby that transformer is energized throughout the period of decay of the additional condenser and during that period the last mentioned transformer energizes the transformer directly controlling the object to be demagnetized and after the decay of the additional condenser it becomes deenergized and the circuit is opened to the object to be demagnetized, the period of decay of the additional condenser being greater than at least the period of energization of each of the first and second condensers.