US2471819A - Circuit for generating a saw-toothlike current in the deflecting coil of cathode-raytubes - Google Patents

Circuit for generating a saw-toothlike current in the deflecting coil of cathode-raytubes Download PDF

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Publication number
US2471819A
US2471819A US661527A US66152746A US2471819A US 2471819 A US2471819 A US 2471819A US 661527 A US661527 A US 661527A US 66152746 A US66152746 A US 66152746A US 2471819 A US2471819 A US 2471819A
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United States
Prior art keywords
current
circuit
sawtooth
voltage
generating
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Expired - Lifetime
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US661527A
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English (en)
Inventor
Kerkhof Frederik
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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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
    • 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

Definitions

  • This invention relates to a circuit for generating a sawtooth-like current in the deflecting coils of a cathode ray tube, particularly in the image deflecting coils of the cathode ray tube in a television device.
  • a circuit of this kind generally includes a source that generates a sawtooth voltage and an amplifier valve into whose anode circuit the deflecting coils are included via a transformer. If the sawtooth-like voltage is supplied to the control grid of the amplifier valve directly, the curve shape of the current passing through the deflecting coils is found to diverge from the sawtooth-shape in that during the stroke of the sawtooth the current does not increase lineally as a function of time, as in the case of a pure sawtooth-course. The lower the frequency of the sawtooth oscillation and the smaller the primary inductance of the transformer, the more intense is this distortion. That is why this transformer-coupled circuit is not serviceable without additional means for the image deflection in a television device in which the frequency of the sawtooth oscillation is 50 or 60 cycles/sec.
  • the primary inductance of the transformer is chosen to be such that the anode direct current of the amplifier valve is at least approximately a minimum.
  • the invention is consequently based on recognition of the fact that there is a given value of the primary inductance at which the parabolic voltage at the control grid that counteracts the distortion brings about such a divergence of the anode current from the sawtooth-shape that the anode direct current of the amplifier valve becomes a minimum.
  • the circuit shown in Fig. 1 comprises an amplifier valve I of the pentode type, in the anode circuit of which the deflecting coils 2 of a cathode ray tube (not shown) are included via a transformer 3.
  • Fig. 2 shows the substitution diagram of the transformer and the deflecting coils, Lp designating the primary inductance of the transformer and Ls and Re the inductance and resistance of the deflecting coils as transformed on the primary side.
  • the integration constant 0 contained therein may L,, 1 TR,
  • the anode current is. thus becomes:
  • Fig. i is a graph showing the relation between 52.0 and Lp as given by this equation and shows that as the primary inductance Lp decreases the anode direct current falls and on having reached a minimum at increases again.
  • the primary inductance of the transformer is chosen to be such that the relation (7) is fulfilled at least approximately, the circuit thus acting with a maximum output.
  • the voltage supplied to the control grid mustv have the same shape. If starting with a sawtooth-like voltage this may, as already mentioned hereinbefore, be ensured by either using a negative feedback or by feeding a sawtooth-like voltage via a, phase shifting network to the control grid, as shown in Figs. 6 and '7 respectively.
  • Fig. 6 shows a negative feedback circuit, a resistance, which is also included in the grid circuit of the amplifier, I, being connected in series with the deflecting coils.
  • the source of voltage that supplies a sawtooth-like voltage is designated by 5.
  • the sawtooth-like voltage which is generated by the source 5, is fed by a phase shifting network constituted by condensers 6 and I and a resistance 8 to the control grid of the amplifier valve l.
  • a circuit for generating a sawtooth-like current in the deflecting coils of a cathode ray tube comprising: a vacuum tube amplifier, the anode circuit of which includes a transformer coupling to the deflecting coils; a source of supply of sawtooth voltage connected to the input of said amplifier; means for correcting the distortion of the current in the deflecting coils; and in which circuit, the primary inductance of the transformer is equal to substantially .29'IRs, where T is the period of the saw tooth current and Rs is the transformed secondary resistance, whereby the D. C. component of the anode current is maintamed a minimum.
  • a circuit for generating a sawtooth-like current in the deflecting coils of a cathode ray tube comprising: a vacuum tube amplifier, the anode circuit of which is transformer-coupled to the deflecting coils; a source of supply of sawtooth voltage which is fed to the input of said amplifier; feedback means for correcting the distortion of the sawtooth wave in the deflecting coils; and in which anode circuit, the primary inductance of the transformer is equal to substantially .29TR5, where T is the period of. the sawtooth current and Rs is the transformed secondary resistance, whereby the D. C. component of the anode current is maintained a minimum.
  • a circuit for generating a sawtooth-like current in the deflecting coils of a cathode ray tube comprising: a vacuum tube amplifier, the anode circuit of which is transformer coupled to the deflecting coils; a source of supply of sawtoothiike voltage which is fed to the input of said amplifier via a phase shifting network; and in which anode circuit, the primary inductance of the transformer is equal to substantially .29'IRs, where T is the period of the sawtooth current and R5 is the transformed secondary resistance, whereby the D. C. component of the anode current is maintained a minimum.

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  • Details Of Television Scanning (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
US661527A 1945-11-07 1946-04-12 Circuit for generating a saw-toothlike current in the deflecting coil of cathode-raytubes Expired - Lifetime US2471819A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL259000X 1945-11-07

Publications (1)

Publication Number Publication Date
US2471819A true US2471819A (en) 1949-05-31

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ID=19781427

Family Applications (1)

Application Number Title Priority Date Filing Date
US661527A Expired - Lifetime US2471819A (en) 1945-11-07 1946-04-12 Circuit for generating a saw-toothlike current in the deflecting coil of cathode-raytubes

Country Status (7)

Country Link
US (1) US2471819A (fr)
BE (1) BE469484A (fr)
CH (1) CH259000A (fr)
DE (1) DE930167C (fr)
FR (1) FR943426A (fr)
GB (1) GB632175A (fr)
NL (1) NL77381C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650955A (en) * 1951-01-09 1953-09-01 William L Martin Transformer-coupled pulse-train amplifier
US2654050A (en) * 1950-06-25 1953-09-29 Int Standard Electric Corp Saw-tooth wave generator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2059219A (en) * 1930-05-05 1936-11-03 Farnsworth Television Inc Slope wave generator
US2284378A (en) * 1940-05-03 1942-05-26 Gen Electric Deflecting circuit
US2414546A (en) * 1942-01-06 1947-01-21 Westinghouse Electric Corp Television sweep circuits
US2440786A (en) * 1943-06-30 1948-05-04 Rca Corp Cathode-ray beam deflecting circuits

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH71358A (de) * 1915-03-22 1915-12-16 Aeg Tragkörper für das Triebsystem von Elektrizitätszählern
FR838387A (fr) * 1937-05-24 1939-03-03 Fernseh Ag Transformateur pour courants en dents de scie

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2059219A (en) * 1930-05-05 1936-11-03 Farnsworth Television Inc Slope wave generator
US2284378A (en) * 1940-05-03 1942-05-26 Gen Electric Deflecting circuit
US2414546A (en) * 1942-01-06 1947-01-21 Westinghouse Electric Corp Television sweep circuits
US2440786A (en) * 1943-06-30 1948-05-04 Rca Corp Cathode-ray beam deflecting circuits

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654050A (en) * 1950-06-25 1953-09-29 Int Standard Electric Corp Saw-tooth wave generator
US2650955A (en) * 1951-01-09 1953-09-01 William L Martin Transformer-coupled pulse-train amplifier

Also Published As

Publication number Publication date
DE930167C (de) 1955-07-11
NL77381C (fr)
CH259000A (de) 1948-12-31
GB632175A (en) 1949-11-17
FR943426A (fr) 1949-03-08
BE469484A (fr)

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