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US2489375A - Circuit arrangement for producing a saw-tooth current in inductance coils - Google Patents

Circuit arrangement for producing a saw-tooth current in inductance coils Download PDF

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Publication number
US2489375A
US2489375A US746694A US74669447A US2489375A US 2489375 A US2489375 A US 2489375A US 746694 A US746694 A US 746694A US 74669447 A US74669447 A US 74669447A US 2489375 A US2489375 A US 2489375A
Authority
US
United States
Prior art keywords
coil
inductance
circuit
auxiliary
saw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US746694A
Other languages
English (en)
Inventor
Haantjes Johan
Valeton Josue Jean Philippe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2489375A publication Critical patent/US2489375A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K6/00—Manipulating pulses having a finite slope and not covered by one of the other main groups of this subclass
    • H03K6/04—Modifying slopes of pulses, e.g. S-correction
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/90—Linearisation of ramp; Synchronisation of pulses

Definitions

  • the invention relates to a circuit-arrangement for producing a saw-tooth current in an inductance coil exhibiting both inductance and resistance with the aid of a pulse-like voltage this voltage having a, constant value between the pulses and for a longer time period than the duration of each pulse.
  • Circuit-arrangements of this kind are used, for example, for deflecting cathode-rays in cathode-ray tubes, the coil being used as a deflecting coil.
  • the pulse-like voltage may, for example, be obtained from the secondary of a transformer, the primary of which is included in the output circuit of a time-base generator, this generator being designed such that during the fly-back of the saw-tooth current of the generator avoltage of constant value is set up across the primary, and thus also across the secondary, of the transformer.
  • the sawtooth current produced in the coil should vary linearly with time during the fly-back.
  • this will not be the case.
  • the deviation from straight line relationship is, in this case, proportional to the exponent and to the time duration of the period of sawtooth current.
  • the time duration of the period is generally prescribed, and
  • the object of the invention is to provide a circuit-arrangement, in which the deviation from linearity of the saw-tooth current is considerably smaller than in the well-known circuit-arrangements.
  • the invention is based on recognition of the fact that this deviation is primarily due to phase distortion for the various frequencies of the components into which the voltage applied in a pulse-like fashion can be broken down.
  • FIG. 3 4 and 2 illustrate a circuit-arrangement of the said This ensures a further reduction of the value of kind and the pulse-like voltage supplied thereto tan g). respectively.
  • Figure 3 is a modification of Fig- The optimum effect of the circuit-arrangement ure 1. The circuit-arrangement shown in Fig.
  • a further embodiment comprises the series combination of a coil l com- 5 of the circuit-arrangement accordin to the inprising inductance designated L1 and resistance vention, provision is also for the coils l and 2 designated 11, and a parallel circuit, of which one to be such that the condition: branch includes a coil 2 comprising inductance designated L2 and resistance designated T2, and L2 L2 the other branch a coil 3 comprisin inductance 10 designated L and resistance designated 1.
  • a pulse-like voltage having the shape illustrated in is fu1fiued F 2 1S supphed the Input .r If this condition is fulfilled, a minimum value ThlS voltage is constituted by periodical pulses found. fortan (p at lower Values of w. on com gs gi iz g f ig s; g gf z g gfi ig sidering the expression found above for tan (1),
  • a voltage of this kind can be Wh ch ca be W e m 0 produced in a number of ways which are not of interest to the present invention. 7 tan If this voltage is assumed to be. composed of sinusoidal components and if in the circuit-arrangement shown in Fig.
  • tan in order to reduce phase distor- 1 tion, tan must always be smaller than tan 1.
  • tanqv the value found for tanz indication that tanqv will, in actual fact, alis found for an angular velocity of w of 6.10' ways be smaller than tan (731, if the conditions are radius per second, that is to say approximately satisfied that 64 times smaller than in the case of direct supply of this voltage to the coil.
  • the values of r T and L may be in ohms and henries. This ref is larger than I 65 sults in a considerably improved approximation 2 of the straight-line relationship of the saw tooth current.
  • This capacit ma .be expressed in faradsv
  • the first condition indicates that the quality of Arfhrther improvemint the shlape of the coil 2 composed of L2 and m which is connected tooth current can thus be ensuredsaid improve in parallel with the coil 3 composed of L and r 5 ment being a maximum if must have a lower figure of merit than the latter.
  • Those parts of the circuit-arrangement which is smaller than correspond to parts of the circuit-arrangement shown in Fig. 1 are designated by like referencenumerals. so that the figure of merit of the series-con- For this circuit-arrangement also, a calcula nected coil is higher than that-of the coil L, r. tion similar to the preceding permits of calculating the current i'passing through the coil 3 for a given value of w it being again found that times a factor which introduces the distortion.
  • a circuit-arrangement for producing a sawtooth current in an inductance coil exhibiting an inductance L and a resistance 1' including a pulse-like voltage which exhibits a constant value between the pulses and for a longer time than the duration of each pulse, wherein this pulse-like voltage is fed to a circuit, said circuit comprising the series combination of an auxiliary coil exhibiting an inductance L1 and a resistance 1'1 and a parallel circuit, of which one branch includes the inductance coil (L, r) and the other branch an auxiliary coil exhibiting an inductance L2 and a resistance 12, and these auxiliary coils being of such value that I2 1'.
  • L2 is greater than L and - 2. 1s smaller than Z+2L2 3.
  • a circuit arrangement to produce sawtooth electric variations in an inductance coil having an inductance designated L and a resistance component 1 comprising, a source of alternating current having a stepped wave shape, a first auxiliary coil having an inductance L1 and a resistance component 11, a second auxiliary coil having an inductance L2 and a resistance component r2, said second auxiliary coil coupled in parallel with the inductance coil, said source of desired signals supplied to a series connection of the said first auxiliary coil and the parallel coupling of the inductance coil and the said second auxiliary coil, and said first and second auxiliary coils having values with respect to the said inductance coil at which is smaller than L and V L 1 IL L, L 2L,
  • a circuit arrangement to produce sawtooth electric variations in an inductance coil having an inductance designated L and a resistance component r comprising, a source of alternating current having a stepped wave shape, a first auxiliary coil having an inductance L1 and a resistance component 11, a second auxiliary coil having an inductance L2 and a resistance component T2, a capacitive element in series with the said second auxiliary coil, said second auxiliary coil and capacitive element coupled in parallel with the inductance coil, said source of desired signals sup,- plied to a series connection of the said first auxiliary coil and the parallel coupling of the inductance coil and the said second auxiliary coil and capacitive element, and said first and sec- 0nd auxiliary coils having values with respect to the said inductance coil at which 1 L L2 L and 11 1 n.

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  • Details Of Television Scanning (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Generation Of Surge Voltage And Current (AREA)
US746694A 1946-05-10 1947-05-08 Circuit arrangement for producing a saw-tooth current in inductance coils Expired - Lifetime US2489375A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL647478X 1946-05-10

Publications (1)

Publication Number Publication Date
US2489375A true US2489375A (en) 1949-11-29

Family

ID=19791960

Family Applications (1)

Application Number Title Priority Date Filing Date
US746694A Expired - Lifetime US2489375A (en) 1946-05-10 1947-05-08 Circuit arrangement for producing a saw-tooth current in inductance coils

Country Status (5)

Country Link
US (1) US2489375A (fr)
DE (1) DE895040C (fr)
FR (1) FR946426A (fr)
GB (1) GB647478A (fr)
NL (1) NL77100C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559525A (en) * 1949-12-31 1951-07-03 Rca Corp Cathode-ray deflection circuits

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR823067A (fr) * 1936-07-13 1938-01-13 Fernseh Ag Système de tube à rayons cathodiques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559525A (en) * 1949-12-31 1951-07-03 Rca Corp Cathode-ray deflection circuits

Also Published As

Publication number Publication date
NL77100C (fr)
GB647478A (en) 1950-12-13
FR946426A (fr) 1949-06-02
DE895040C (de) 1953-10-29

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