US3777252A - Constant current source for the operation of multiple coil systems - Google Patents

Constant current source for the operation of multiple coil systems Download PDF

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Publication number
US3777252A
US3777252A US00328741A US3777252DA US3777252A US 3777252 A US3777252 A US 3777252A US 00328741 A US00328741 A US 00328741A US 3777252D A US3777252D A US 3777252DA US 3777252 A US3777252 A US 3777252A
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United States
Prior art keywords
threshold
transistor
operational voltage
winding
switch
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US00328741A
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English (en)
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H Leszke
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Hell R dt GmbH
HELL R GmbH
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HELL R GmbH
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/28—Arrangements for convergence or focusing
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/46—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC
    • G05F1/56—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices

Definitions

  • ABSTRACT A constant current source for the operation of multiple'coil systems, utilizing a static winding and one or more dynamic windings effective at a common air gap, including a constant operational voltage source, a corrective element between the operation voltage source and static winding, and a current control system operative to control the correcting element, in which a corresponding higher operational voltage is applied to the static winding in the presence of subtractive voltages induced in the static winding as a result of the dynamic winding, with the corresponding higher operational voltage being derived from an independent voltage source or from the charge on one or more capacitors, arranged for charging to the lower operational voltage and adapted to be connected in series to provide a multiple of such voltage.
  • the invention is directed to a constant current source for the operation of multiple coilsystems employing a static and one or more dynamic windings which are effective at a common air gap,;in which the constant current source includes a constant operational voltage source, a correcting element operatively disposed between the operational .voltage source and the static winding, and with a current control system for effecting control of the correcting element.
  • the voltages induced in the static winding may be greater than the operational voltage applied to the control circuit.
  • the problem is solved in the present invention by the utilization of a thresholdvalue sensing system which is connected to the static winding and to a thresholdvalue switch whereby the latter will operatively connect the static winding, over the correcting element, with a higher operational voltage in the presence of subtractive voltages induced in the static winding resulting from the presence of the dynamic winding.
  • the higher operational voltage a separate, independent higher operational voltage supply, or one or morecapacitors which are charged by the normal low operational voltage and whose charge voltage can be operatively connected in series with the operational voltage over a cooperable switch when the threshold-value switch is actuated by the presence of an induced voltage peak.
  • one or more addi tional capacitors circuits of the same type may be provided, preferably each utilizing a transistor as the switching means for such capacitor.
  • a transistor may be employed as the threshold-value switch and a Zener diode as the sensing means for actuating such transistor.
  • the invention proceeds from the recognition that current changes in a winding of a multiple-coil system do not immediately cause a corresponding voltage at the terminals of a second magnetically coupled winding, but, due to the inductivity and capacitance of the winding, results following a delay, whereby the second winding behaves as a parallel oscillator circuit which may even overshoot in the opposite direction, assuming a small loss resistance.
  • the relatively slow increase of the induced coil voltage permits the switching over from the normal lower operational voltage to a higher operational voltage for a required short period of time when a predetermined threshold-value is reached at the static winding.
  • the threshhold-value switch will immediately deactivate to return the application of the normal low operational voltage to the static winding. This operation can be repeated as often as desired and presents the advantage that the increased operational voltage is applied when only actually required, whereby the loss at the correcting element of the current control system is increased only very slightly above the value existing under purely static operations.
  • FIG. 1 is a schematic circuit diagram of a system according to the invention employing a separate independent higher voltage source
  • FIG. 2 is a schematic circuit diagram, similar to FIG. 1 illustrating a further embodiment of the invention in which two capacitors and respective controlling transistors are utilized as a higher voltage source;
  • FIG. 3 is a graphic representation of various voltages involved in the operation of the system.
  • FIG. 1 illustrating an example of a system, embodying the invention, for the current supply of a combined static-dynamic focussing system, indicated generally by the numeral 1, which comprises a static winding w, containing a relatively large number of turns, and a dynamic winding w containing a substantially smaller number of turns, with the respective windings being disposed at a common air gap, not illustrated.
  • a current control system which insures that a constant current will steadily flow through the static winding w such control system being supplied with a constant voltage over terminals P and P and in the example, a negative operational voltage of 40V being supplied at the terminal P
  • the current of the static winding w flows across the resistance R.;, over winding w transistor T and across the decoupling diode D to the low operational voltage at terminal P
  • a current change occuring at the resistor R thus causes a corresponding current change at the resistor R If a difference arises between the current through the resistor 25 and the current, which flows from P through the resistors R, and R a voltage change will result at the summation point a, of the amplifier A, ie a negative potential will be produced at the inverting input of the amplifier A.
  • the latter will be amplified, appearing at the outlet a of the control amplifier A with positively increasing potential and will be applied to the base of the transistor T, over the resistor R,,.
  • the collector current of the transistor T thus will be lowered.
  • the collector current of the latter will likewise be lowered and thereby the current for the static winding w, will likewise be lowered.
  • Such control loop is so designed that an equilibrium of currents will occur under normal static operation, whereby the winding current is proportional to the current through resistors R, and R
  • the voltage of the static winding w will be influenced either additively or subtractively, whereby the winding terminal w, becomes either more positive or more negative with respect to its normal static level. If a positive induced voltage occurs at the winding terminal w, this will result in an addition to the lower operational voltage source and will be controlled without difficulty by the control amplifier A (see the positive induced amplitude at the left side of FIG. 3), by effecting an increase in the collector-emitter resistance of the transistor T functioning as a correcting element.
  • Such switching over is initiated when the Zener voltage of the diode D, is reached, such voltage being conducted over diode D and series resistors R to the base of a transistor T functioning as a threshold-value switch.
  • the transistor T following triggering thereof, will so control a transistor T connected over resistor R,,, with the collector of the transistor T that the transistor T, will be conductive.
  • base resistor R, for the transistor T and base resitor R,, for the transistor T are provided.
  • FIG. 2 illustrates a further embodiment of the invention which in many respect corresponds directly with the circuit of FIG. 1, and accordingly component elements of FIG. 2 are provided with the same reference numerals as corresponding elements illustrated in FIG. 1.
  • the low voltage source is operatively connected to the emitter of the transistor T over respective diodes D,, and D,,.
  • the diode D is operatively shunted by a capacitor C, and the emittercollector path of a transistor T the collector of which, and thus one side of the capacitor C,, being connected to common by a resistor.
  • the base of the transistor T is operatively connected over a resistor R,,, to the collector of the transistor T
  • the diode D is operatively shunted by the capacitor C and emittercollector path of the transistor T R,, comprising the base resistor and resistor R,, connecting the base thereof to the collector of the transistor T
  • the capacitors C, and C will be charged to the potential of the low operating voltage appearing at terminal P If a negative induced voltage now appears at the winding terminal W the transistor T, will be rendered conductive in the manner previously described, and as the bases of the two transistors T and T are connected with the collector of the transistor T such transistors likewise will conduct.
  • the charges on the respective capacitors will be applied in series with the low operational voltage -40V on the emitter of the transistor T and as soon as the negative induced amplitude has decayed below the threshold-value of Zener diode D, the transistors T T and T, will again be blocked, permitting the capacitors C, and C to recharge.
  • a constant current source for the operation of multiple coil systems employing a static winding and at least one dynamic windings, effective at a common air gap, having a constant operational voltage source, a correcting element operatively disposed between the operational voltage source and the static winding, and a current system operative to control the correcting element, comprising a threshold-value switch, thresholdvalue sensing means operatively connected to the static winding and to the threshold value switch, a corresponding higher operative voltage source, said threshold-value switch being operative in the presence of subtractive voltages, induced in the static winding as a result of the presence of the dynamic winding, to connect the static winding with said higher corresponding operational voltage source over said correcting element.
  • the higher operational voltage source comprises at least one capacitor circuited to be charged by the lower operational voltage, and associated switch means operatively connected to said threshold-value switch, operative, when the latter is actuated, to switch the charge voltage of said capacitor in series with the lower operational voltage source.
  • said associated switch means comprises a transistor.
  • each of said capacitors is circuited to receive said lower operational voltage over an appropriately poled diode, the transistor comprising the switch means associated with each capacitor being operatively connected in series with such capacitor, and such capacitor and cooperable transistor shunting the associated diode, said diodes being operative, when the associated transistors are blocked, to supply the lower operational voltage to said correcting element and to the respective associated capacitors to charge the same, and, when the associated transistors are conductive, to prevent discharge of the associated capacitor other than in series with said operational voltage and said correcting element.
  • said correcting element comprises a transistor operatively connecting said winding, over said diodes, to said lower operational voltage
  • said threshold-value switch comprising a transistor operatively controlled by said threshold-value sensing means, the latter comprising a Zener diode operatively connecting said winding to said threshold-value transistor.
  • said correcting element comprises a transistor operatively connecting said diode and said first mentioned transistor to said winding, said threshold-value switch comprising a transistor operatively controlled by said thresholdvalue sensing means, said threshold-value sensing means comprising a Zener diode operatively connecting said winding to said threshold value transistor.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)
  • Dc-Dc Converters (AREA)
US00328741A 1972-02-05 1973-02-01 Constant current source for the operation of multiple coil systems Expired - Lifetime US3777252A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2205468A DE2205468A1 (de) 1972-02-05 1972-02-05 Konstantstromquelle zum betrieb von mehrfachspulensystemen

Publications (1)

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US3777252A true US3777252A (en) 1973-12-04

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US00328741A Expired - Lifetime US3777252A (en) 1972-02-05 1973-02-01 Constant current source for the operation of multiple coil systems

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US (1) US3777252A (en:Method)
JP (1) JPS5432299B2 (en:Method)
DE (1) DE2205468A1 (en:Method)
FR (1) FR2170271B1 (en:Method)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050135040A1 (en) * 2003-12-11 2005-06-23 Anden Co., Ltd. Relay device having holding current stabilizing and limiting circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991407A (en) * 1958-02-17 1961-07-04 Sylvania Electric Prod Current supply apparatus
US3350599A (en) * 1966-12-29 1967-10-31 Rca Corp Color television kinescope ultor voltage regulator utilizing a voltage dependent resistor in the control grid circuit of the regulator triode
US3496408A (en) * 1968-05-17 1970-02-17 Rank Organisation Ltd Cathode ray tube focusing arrangements
US3613109A (en) * 1969-08-15 1971-10-12 Admiral Corp Horizontal convergence circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991407A (en) * 1958-02-17 1961-07-04 Sylvania Electric Prod Current supply apparatus
US3350599A (en) * 1966-12-29 1967-10-31 Rca Corp Color television kinescope ultor voltage regulator utilizing a voltage dependent resistor in the control grid circuit of the regulator triode
US3496408A (en) * 1968-05-17 1970-02-17 Rank Organisation Ltd Cathode ray tube focusing arrangements
US3613109A (en) * 1969-08-15 1971-10-12 Admiral Corp Horizontal convergence circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050135040A1 (en) * 2003-12-11 2005-06-23 Anden Co., Ltd. Relay device having holding current stabilizing and limiting circuit
US7262950B2 (en) * 2003-12-11 2007-08-28 Anden Co., Ltd. Relay device having holding current stabilizing and limiting circuit

Also Published As

Publication number Publication date
FR2170271B1 (en:Method) 1977-02-11
FR2170271A1 (en:Method) 1973-09-14
JPS4889626A (en:Method) 1973-11-22
DE2205468A1 (de) 1973-08-16
JPS5432299B2 (en:Method) 1979-10-13

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