US2801366A - Circuit arrangement for producing a sawtooth current - Google Patents

Circuit arrangement for producing a sawtooth current Download PDF

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Publication number
US2801366A
US2801366A US446527A US44652754A US2801366A US 2801366 A US2801366 A US 2801366A US 446527 A US446527 A US 446527A US 44652754 A US44652754 A US 44652754A US 2801366 A US2801366 A US 2801366A
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US
United States
Prior art keywords
current
sawtooth
tube
producing
circuit
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Expired - Lifetime
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US446527A
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English (en)
Inventor
Janssen Peter Johanne Hubertus
Smeulers Wouter
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US2801366A publication Critical patent/US2801366A/en
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    • 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
    • H03K4/39—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 using a tube operating as an amplifier
    • H03K4/43—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 using a tube operating as an amplifier combined with means for generating the driving pulses

Definitions

  • the invention relates to a circuit arrangement for producing a sawtooth current in a coil which is fed through the secondary winding of a transformer, of which the primary winding, included in the anode circuit of a discharge tube, has an inductance such that the direct anode current traversing the tube is substantially at a minimum, the control-grid circuit of this tube having fed to it a sawtooth voltage through a distorting network which has a substantially dual relationship with the system included in the anode circuit of the tube.
  • Such known circuits are often used for producing sawtooth currents for deflection in the direction of the image, i. e. for vertical deflection, in television receivers.
  • the anode current of the tube Owing to the aforesaid choice of the inductance and of the primary winding of the transformer the anode current of the tube must be constituted by a sawtooth component and a parabolic component.
  • the grid voltage must, consequently, have a sawtooth component and a parabolic component. If the sawtooth voltage is assumed to be substantially linear, this grid voltage is obtained by means of the distorting network, which has a substantially dual relationship with the system included in the anode circuit of the tube.
  • the invention has for its object to mitigate this drawback and has the feature that the sawtooth voltage is supplied through the parallel combination of a resistor and a capacitor to the dual network.
  • reference numeral 1 designates the discharge tube arranged in an amplifier stage, the anode circuit of which includes the primary winding of a transformer 3. To the secondary winding 4 of the transformer is connected the deflection coil 5.
  • the substitute diagram of the complete system included in the anode circuit of the tube is found to be constituted in practice by the parallel combination of the primary inductance Lp of the transformer and the resistance of the deflector Rs, transformed to the primary side, the parasitic inductances and the resistances of the transformer and the inductance of the conventional deflector being found to have in practice no considerable effect, so that they are negligible.
  • T is the duration of the stroke of the sawtooth current across the coil 5.
  • the inductance will differ in general not more than a factor 2from the value of 0.29R5T, which means that then the direct anode current differs less than 20% from the minimum value.
  • the anode current of the tube must be constituted by a sawtooth current component and a parabolic current component. If the characteristic curve of the tube 1 is straight, this is achieved with the aid of a dual network in the grid circuit of the tube.
  • this network comprises capacitors 6 and 7 and a resistor 8.
  • the sawtooth voltage is derived from a circuit known per se, which is shown here for the sake of simplicity by a resistor 9, a capacitor 10 and a switch 11, connected in parallel there with and opening and closing periodically, the sawtooth voltage occurring at the capacitor 10.
  • the capacitor 10 is connected directly in parallel with the series combination of the capacitors 6 and 7, which brings about that owing to the curvature of the characteristic of tube 1 a non-linear deflection current flows across the coil 5.
  • the voltage across the capacitor 10 is supplied to the dual network 6, 7, 8 through the parallel combination of the resistor 12 and the capacitor 13.
  • the capacity of the capacitor 13 is about five to ten times higher than the capacity of the capacitor 6, whilst the time constant of the network 12, 13 is about equal to /5 of the duration T of the stroke of the sawtooth current across the coil 5.
  • a circuit for producing a sawtooth current in a coil comprising a transformer having a secondary winding connected to said coil and having a primary winding, an amplifier stage comprising an electron discharge tube having an input electrode and an output electrode, means to supply current through said primary winding to said output electrode, said primary winding being connected to receive signals from said output electrode and having a value of inductance to minimize the direct current in said tube, a distorting network connected to said input electrode, a source of sawtooth voltage, and a parallel combination of a resistor and a capacitor connected between said source of sawtooth voltage and said distorting network.
  • a circuit for producing a sawtooth current in a coil comprising a source of sawtooth voltage, an amplifier stage comprising an electron discharge tube having input and output electrodes and a common electrode, a first combination of parallel-connected resistance and capacitance, a second combination of parallel-connected resistance and capacitance, said combinations being connected in series between said source of sawtooth voltage and said input electrode, a condenser connected between said input electrode and said common electrode, a transformer having a primary winding connected to said output electrode and having a secondary winding connected to said coil, and means connected to supply current through said primary winding to said output electrode, said pri- 3 4 mary winding having a value of inductance to minimize References Cited in the file of this patent the direct current in said tube.

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US446527A 1953-08-13 1954-07-29 Circuit arrangement for producing a sawtooth current Expired - Lifetime US2801366A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL320972X 1953-08-13

Publications (1)

Publication Number Publication Date
US2801366A true US2801366A (en) 1957-07-30

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ID=19783987

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Application Number Title Priority Date Filing Date
US446527A Expired - Lifetime US2801366A (en) 1953-08-13 1954-07-29 Circuit arrangement for producing a sawtooth current

Country Status (5)

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US (1) US2801366A (enrdf_load_stackoverflow)
BE (1) BE531067A (enrdf_load_stackoverflow)
CH (1) CH320972A (enrdf_load_stackoverflow)
DE (1) DE959576C (enrdf_load_stackoverflow)
FR (1) FR1106225A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171120A (en) * 1962-07-12 1965-02-23 Theodore L Beeler Clearance line generating system
US3702414A (en) * 1971-06-15 1972-11-07 Philips Corp Circuit arrangement for supplying eht to the accelerator anode of a picture display tube

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382822A (en) * 1942-06-30 1945-08-14 Rca Corp Cathode ray beam deflecting circuits
US2470197A (en) * 1946-09-25 1949-05-17 Rca Corp Electron beam deflection control system
US2633555A (en) * 1947-09-27 1953-03-31 Beam deflection control
US2633554A (en) * 1948-01-24 1953-03-31 Rca Corp Beam deflection control
US2685033A (en) * 1951-01-02 1954-07-27 Rca Corp Beam deflection control for cathode-ray devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382822A (en) * 1942-06-30 1945-08-14 Rca Corp Cathode ray beam deflecting circuits
US2470197A (en) * 1946-09-25 1949-05-17 Rca Corp Electron beam deflection control system
US2633555A (en) * 1947-09-27 1953-03-31 Beam deflection control
US2633554A (en) * 1948-01-24 1953-03-31 Rca Corp Beam deflection control
US2685033A (en) * 1951-01-02 1954-07-27 Rca Corp Beam deflection control for cathode-ray devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171120A (en) * 1962-07-12 1965-02-23 Theodore L Beeler Clearance line generating system
US3702414A (en) * 1971-06-15 1972-11-07 Philips Corp Circuit arrangement for supplying eht to the accelerator anode of a picture display tube

Also Published As

Publication number Publication date
DE959576C (de) 1957-03-07
BE531067A (enrdf_load_stackoverflow)
FR1106225A (fr) 1955-12-15
CH320972A (de) 1957-04-15

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