US3839686A - Method and apparatus for decreasing superimposed or induced alternating currents in direct current and high frequency circuits - Google Patents

Method and apparatus for decreasing superimposed or induced alternating currents in direct current and high frequency circuits Download PDF

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Publication number
US3839686A
US3839686A US00321033A US32103373A US3839686A US 3839686 A US3839686 A US 3839686A US 00321033 A US00321033 A US 00321033A US 32103373 A US32103373 A US 32103373A US 3839686 A US3839686 A US 3839686A
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United States
Prior art keywords
winding
choke
magnetization
coaxial line
core
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Expired - Lifetime
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US00321033A
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English (en)
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W Vogl
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/02—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only
    • B60G11/08—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only arranged substantially transverse to the longitudinal axis of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G3/00—Resilient suspensions for a single wheel
    • B60G3/02—Resilient suspensions for a single wheel with a single pivoted arm
    • B60G3/04—Resilient suspensions for a single wheel with a single pivoted arm the arm being essentially transverse to the longitudinal axis of the vehicle
    • B60G3/10—Resilient suspensions for a single wheel with a single pivoted arm the arm being essentially transverse to the longitudinal axis of the vehicle the arm itself being resilient, e.g. leaf spring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/28—Reducing interference caused by currents induced in cable sheathing or armouring

Definitions

  • a coaxial choke is connected in circuit with an amplifier and a control transformer so that the primary winding of the control transformer and a choke winding are traversed by the same interference current.
  • the magnetization winding of the choke is connected to the output of an amplifier whose input is fed by a feedback winding that is common on the iron core of the choke with the magnetization winding.
  • This invention relates to a method and apparatus for reducing induced alternating currents in high frequency circuits, and more particularly for reducing influencing voltage on coaxial lines through the use of coaxial chokes which are connected in circuit in the ground circuit and the outer conductor of the coaxial lines.
  • step-down transformers It is also known in the prior art to employ passive and actively driven step-down transformers in order to protect telecommunication cables from severe current interference.
  • the actively driven step-down transformer the induced voltage is supplied by way of an auxiliary wire of the telecommunication cable to the input of an amplifier.
  • the output of the amplifier controlled in this way, feeds into a primary winding of the step-down transformer which is not connected to the cable sheathing. This compensates for the wire voltages induced by a strong current installation.
  • the energy generated by the amplifier serves essentially to cover the iron losses of the transformer.
  • the primary object of the present invention is to provide apparatus for effectively reducing through influencing external interference voltages induced in cables to improve the choking effect to a desired degree without there resulting awkward chokes due to a high num ber of choke windings and excessive size.
  • the foregoing objective is realized through the use of means for increasing the effective inductance of a choke in a direct current supply circuit or in a high-frequency transmission circuit through the utilization of an active two-terminal circuit to substantially suppress influencing currents on the outer conductor of a coaxial line.
  • the circuit for realizing induced or superimposed signal reduction can be constructed in such a way that the choke core is provided with an additional thin-wire magnetization winding having a high number of windings and that the magnetization winding is connected with the output of a voltage-controlled amplifier, preferably a multistage amplifier, which is controlled by a voltage derived from the alternating current flowing in the main winding of the choke.
  • a voltage-controlled amplifier preferably a multistage amplifier
  • the active circuit can be designed in the form of a feedback circuit in such a way that the choke core is provided with an additional feedback winding which is connected to an input of an amplifier, and with a thin-wire magnetization winding of a high number of turns which is connected with the output of the amplifier.
  • the effective inductance can be increased in accordance with the chosen degree of amplification of the controlled amplifier.
  • the main winding of the choke therefore, needs only a relatively few turns.
  • FIG. 1 is a schematic circuit diagram of an embodiment of the invention which employs an amplifier which is fed by a control transformer to control a many turn magnetization winding of a choke;
  • FIG. 2 illustrates a second embodiment of the invention which utilizes instead of a control transformer, a feedback winding on the same core as the magnetization winding of a choke for controlling through an amplifier the energization of the magnetization winding of the choke.
  • FIG. 1 there is illustrated in schematic form a choke Dr (a coaxial choke) for increasing the inductance of the ground circuit and having a choke winding W consisting of several turns of the coaxial line about a core.
  • the choke is provided with an additional thinwire magnetization winding W having a high number of turns.
  • the external voltage arising in the ground circuit, which voltage causes the current J through the choke winding W and the primary winding of the control transformer U is symbolically represented in the drawing by an active voltage source U
  • the iron core of the choke Dr is magnetized by the magnetization winding W
  • the magnetization current is delivered by an amplifier V which is driven on its input side by way of the voltage induced in the secondary winding of the control transformer U, the output of the amplifier V being connected to the magnetization winding W
  • the control voltage is derived from the current J flowing in the choke winding W and in the primary winding of the control transformer U.
  • a voltage U which, in correspondence to the amplification of the amplifier V, is greater than the voltage U, on the terminals 1 and 2 of the primary winding of the transformer U.
  • the reference character R is provided to designate the input apparent resistance of the control transformer U between the terminals 1 and 2 and the reference character R is provided to designate the apparent resistance of the choke winding W between the terminals 3 and 4.
  • the choke winding W represents a controlled voltage source E, which has an electromotive force induced by means of the magnetization winding W which electromotive force is greater by the amplification degree of the amplifier V than the voltage drop U, which is provided by the current J on the input apparent resistance R of the control transformer U.
  • the degree of amplification of the amplifier V corresponds to the voltage amplification between the input of the transformer (terminals 1 and 2) and the choke winding W (terminals 3 and 4) in no-load operation.
  • the current J which drives an outer voltage U through the circuit may be seen through the expression
  • the current J from the apparent resistances R and R2 The winding of the active circuit is given, when the amplification is greater than zero, by the following expression which designates the reduction factor r
  • the real part of the quotient must not be negative, since self-excitation of the circuit would otherwise set in. For this reason, the magnetization W of the choke must be correctly poled and-the phase rotation in the amplification path must remain under for voltage amplifications greater than 1.
  • the relation R V R, R must hold. If the apparent resistances R, and R are equal, the current J is then reduced by half of the value of the amplification.
  • the active circuit is to possess frequency characteristics of an inductance, then the apparent impedances R and R of the transformer U and of the choke winding W must be inductive in nature and the voltage amplification of the amplifier V independent of frequency.
  • a pair of wide-band amplification stages each having properties of voltage controlled current sources fulfill these requirements when they are connected over a coupling member which rotates or shifts the phase by 90 and reduces the voltage proportionally with frequency.
  • Voltage-controlled current sources are realizable with transistor circuits.
  • the coupling member can be provided by capacitive load resistance as a phase shifter.
  • the circuit according to FIG. 2 operates with a feedback amplifier and therefore does not require a control transformer.
  • the choke winding W traversed by interfering current is disposed in common with the magnetization winding W and the feed-back winding W on the common iron core of the choke Drl.
  • the iron core is thereby magnetized by a magnetization winding W through the provision of an amplifier V, which is controlled on its input side by the voltage on the feed back winding W and whose output delivers the mag netization current to the magnetization winding W If the choke winding W is placed on an outer voltage U i.e., if in consequence of an external influencing an interfering current flows through the choke winding, the choke winding W in correspondence to the example of execution according to FIG.
  • U signifies the reduced outer voltage
  • V the voltage amplification U,jU, of the circuit when U is the voltage drop on the choke winding W and U is the feedback voltage
  • U the translation ratio of the feedback voltage
  • R the apparent input resistance of the choke winding
  • the feedback winding must be poled in such a way that the quotient of amplification and feedback translation ratio can be negatively substituted, that is if the reduction factor is negative, then self-excitation of the circuit will occur.
  • the present invention may be simply and easily employed in connection with high frequency lines, such as in high-frequency information transmission systems, and in filter circuits of power supplies in place of conventional chokes to minimize undesired interference waves.
  • a circuit for reducing induced interfering alternating voltages in a coaxial line comprising: coaxial choke means including core means, a magnetization winding on said core means and a coaxial line wound about said core means; means including a secondary winding on said core means for deriving a control voltage from an interfering alternating current flowing in the outer conductor of said coaxial line; and a voltage controlled amplifier connected between said secondary winding and said magnetization winding for controlling the'magnetization of said core means and suppression of the inter- 6 ference in accordance with the interfering alternating current.
  • a circuit according to claim 1, comprising a feedback circuit connected between said means for deriving a control voltage and said magnetization winding including said amplifier.
  • a circuit according to claim 2, wherein said means for deriving a control voltage comprises a feedback winding carried on said core means along with said coaxial line of said choke and said magnetization winding and connected to the input of said amplifier.
  • a method of reducing superimposed or induced interference voltages in a coaxial line comprising the steps of: winding the coaxial line about a core of a coaxial choke and about a core of a control transformer to serve as a primary winding for each; increasing the effective inductance of the choke by deriving a control voltage with a secondary winding on the control transformer in accordance with the current traversing the outer conductor of the coaxial line and applying the control voltage to a magnetization winding on the choke core to suppress the interfering voltage.
  • a circuit for reducing induced interfering alternating voltages in a coaxial line comprising: a coaxial choke means including core means, a magnetization winding on said core means and a coaxial line wound about said core means including an outer conductor; means including a control transformer for deriving a control voltage from an interfering alternating current flowing in said outer conductor of said coaxial line including a primary winding constituted by the outer conductor of said coaxial line and a secondary winding; and a voltage controlled amplifier connected between said secondary winding and said magnetization winding for controlling the magnetization of said core means and suppression of the interference in accordance with the interfering alternating current flowing in said outer conductor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Amplifiers (AREA)
US00321033A 1970-02-24 1973-01-04 Method and apparatus for decreasing superimposed or induced alternating currents in direct current and high frequency circuits Expired - Lifetime US3839686A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2008634A DE2008634C3 (de) 1970-02-24 1970-02-24 Schaltungsanordnung zur Verringerung von einer Nutzspannung überlagerten Wechselspannungen

Publications (1)

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US3839686A true US3839686A (en) 1974-10-01

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US00321033A Expired - Lifetime US3839686A (en) 1970-02-24 1973-01-04 Method and apparatus for decreasing superimposed or induced alternating currents in direct current and high frequency circuits

Country Status (5)

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US (1) US3839686A (de)
CH (1) CH532867A (de)
DE (1) DE2008634C3 (de)
NL (1) NL148761B (de)
SE (1) SE367903B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3008412A1 (de) * 1979-03-08 1980-09-11 Hughes Aircraft Co Zweipol zur darstellung eines widerstandes
US5878132A (en) * 1995-06-15 1999-03-02 Murata Manufacturing Co., Ltd. High-frequency noise elimination for use in telephone systems
US6710673B1 (en) 1998-06-26 2004-03-23 Thomas Jokerst Return path noise reducer
US6867564B1 (en) 2001-04-11 2005-03-15 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US6987372B1 (en) 2001-04-11 2006-01-17 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US7132812B1 (en) 2001-04-11 2006-11-07 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
RU2609151C2 (ru) * 2015-06-30 2017-01-30 Федеральное Государственное Унитарное Предприятие Ордена Трудового Красного Знамени Научно-Исследовательский Институт Радио (Фгуп Ниир) Способ снижения уровня напряжений, наводимых на согласованных нагрузках коаксиального кабеля узкополосной радиочастотной помехой

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1773772A (en) * 1926-12-30 1930-08-26 American Telephone & Telegraph Harmonic suppressor
US2280950A (en) * 1941-05-13 1942-04-28 Westinghouse Electric & Mfg Co Pilot wire system with means for neutralizing induced voltages
US3518577A (en) * 1969-07-25 1970-06-30 Baum Elektrophysik Gmbh Radiation protected cables
US3715673A (en) * 1970-02-19 1973-02-06 Baum Elektrophysik Gmbh Noise suppression for communication cables

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1773772A (en) * 1926-12-30 1930-08-26 American Telephone & Telegraph Harmonic suppressor
US2280950A (en) * 1941-05-13 1942-04-28 Westinghouse Electric & Mfg Co Pilot wire system with means for neutralizing induced voltages
US3518577A (en) * 1969-07-25 1970-06-30 Baum Elektrophysik Gmbh Radiation protected cables
US3715673A (en) * 1970-02-19 1973-02-06 Baum Elektrophysik Gmbh Noise suppression for communication cables

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3008412A1 (de) * 1979-03-08 1980-09-11 Hughes Aircraft Co Zweipol zur darstellung eines widerstandes
US5878132A (en) * 1995-06-15 1999-03-02 Murata Manufacturing Co., Ltd. High-frequency noise elimination for use in telephone systems
US6710673B1 (en) 1998-06-26 2004-03-23 Thomas Jokerst Return path noise reducer
US6867564B1 (en) 2001-04-11 2005-03-15 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US6987372B1 (en) 2001-04-11 2006-01-17 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US7132812B1 (en) 2001-04-11 2006-11-07 Rockwell Automation Technologies, Inc. Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
RU2609151C2 (ru) * 2015-06-30 2017-01-30 Федеральное Государственное Унитарное Предприятие Ордена Трудового Красного Знамени Научно-Исследовательский Институт Радио (Фгуп Ниир) Способ снижения уровня напряжений, наводимых на согласованных нагрузках коаксиального кабеля узкополосной радиочастотной помехой

Also Published As

Publication number Publication date
DE2008634C3 (de) 1974-05-09
NL7101852A (de) 1971-08-26
CH532867A (de) 1973-01-15
DE2008634A1 (de) 1972-02-17
NL148761B (nl) 1976-07-15
SE367903B (de) 1974-06-10
DE2008634B2 (de) 1973-10-11

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