US2622227A - Circuits for generating saw tooth oscillations - Google Patents

Circuits for generating saw tooth oscillations Download PDF

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Publication number
US2622227A
US2622227A US196780A US19678050A US2622227A US 2622227 A US2622227 A US 2622227A US 196780 A US196780 A US 196780A US 19678050 A US19678050 A US 19678050A US 2622227 A US2622227 A US 2622227A
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US
United States
Prior art keywords
tube
oscillations
transformer
load
circuits
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Expired - Lifetime
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US196780A
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English (en)
Inventor
Huntley Keith Gordon
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
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Filing date
Publication date
Application filed by EMI Ltd filed Critical EMI Ltd
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Publication of US2622227A publication Critical patent/US2622227A/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

  • This finvention relates to circuits for the generation of electrical sawtooth oscillations in an inductive load and it relates particularly but not exclusively to circuits for generating sawtooth oscillations in the scanning coils of a cathode ray tube incorporated, for example, in television apparatus.
  • an electron discharge tube (hereinafter referred to-fior rent oscillations in said load, and :a damper tube for reducing undesired oscillations at the ends convenience as the power tube) is arranged to of the short :flanks .ofsa'id sawtooth oscillations, apply a voltage periodically to the load, for exsaid power tube .being coupled to said load Mia ample the scanning coils of a cathode ray tube, two transformers connected in cascade and :the to develop the long flanks of sawtooth current anode-cathode path of said damper tube being oscillations, thetube being rendered nonconductconnected across the connected windings of said ing periodically at times corresponding to the transformers.
  • reference numeral the sawtooth oscillation and becoming conductl indicates low inductance scanning coils of a ing at the end of the half cycle so as to damp cathode ray tube, sawtooth current being fed to the free oscillations.
  • said coils from a, power tube 2.
  • the power tube It is frequently required to employ a load hav- 2 is coupled to the coils I via two transformers ing a relatively low inductance, this being the 3 and 4 connected in cascade, the anode of tube case, for example, when the load comprises scan- 2 being connected to one end of the primary windning coils, since these are difficulties associated ing of transformer 3, the other end of said windwith the use of high inductance coils.
  • damper e is ShOWn at 5, and h s its o that a suitably high impedance is presented to cat o pa h c te ac ss the s c dary the damper tube, but such an arrangement has winding of t transformer 3 and the Pr a y the disadvantage that when the damper tube be- Winding 0f the traIlSfOrmer Preferahly the comes conducting the energy which at this time damper tube 6 is provided with a control electrode is stored in the field of the transformer sets up as shown, and a negative feedback path to said ringing oscillations in the circuit comprising the control electrode is p o Via condenser an leakage inductance of the primary and tertiary amplifier being included if desired in the feedwindings and the stray capacities associated back path.
  • the control electrode of the damper therewith, and said ringing oscillations are trans- 5 tube 6 is connected via a resistor 9 to the negaferred to the load due to the leakage inductance tive bias terminal ll]. of the tertiary winding in series with the damper
  • the power tube tube serving to couple the scanning coils with 2 serves to generate sawtooth current oscillathe circuit in which the ringing oscillations occur.
  • tions in the load I by virtue of a suitable form
  • the object of the invention is to provide a cirof control voltage applied between the cathode and control electrode of tube 2 by any suitable means.
  • the coils i are of low inductance but the voltage ratio of transformer 4 is arranged to be such, having regard to the type of tube employed as the damper tube, that the impedance presented to the damper tube 6 by the transformer 4 is higher than that of the coils l, and is more suitable than the impedance of coils l for effective operation of the damper tube.
  • Negative feedback is applied to the control electrode of damper tube 6 via condenser I, and serves to reduce the effective resistance of the damper tube, thereby greatly reducing the likelihood of the internal impedance of the damper tube permitting the transfer of ringing oscillations from the leakage inductance circuits of the transformer 3 to the coils l.
  • Negative feedback may also be applied to the control electrode of power tube 2, the feedback tending to improve the linearity of the sawtooth current oscillations in the coils l as described in the United States patent application Serial No. 128,598, filed November 21, 1949 by J. E. Best and R. C. White.
  • a circuit comprising a low inductance load, a power tube to set up sawtooth current oscillations in said load, a first transformer having its primary winding connected in the output circuit of said power tube, a second transformer havin its primary winding connected to the secondary winding of said first transformer and having its secondary winding connected to said low inductance load, and a damper tube having its anode-cathode path connected across the secondary winding of said first transformer and across the primary winding of said second transformer with said second transformer presenting to said damper tube an impedance higher than that of said load.
  • a circuit comprising a low inductance load, a power tube to set up sawtooth current oscillations in said load, a first transformer having its primary winding connected in the output circuit of said power tube, a second transformer having its primary winding connected to the secondary winding of said first transformer and having its secondary winding connected to said low inductance load, a damper tube having its anode-cathode path connected across the secondary winding of said first transformer and across the primary winding of said second transformer with said second transformer presenting to said damper tube an impedance higher than that of said load, said damper tube having a control electrode, and means for applying negative feedback to said control electrode to reduce the effective resistance of said damper tube.

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  • Details Of Television Scanning (AREA)
  • Magnetically Actuated Valves (AREA)
US196780A 1949-11-30 1950-11-21 Circuits for generating saw tooth oscillations Expired - Lifetime US2622227A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30673/49A GB689316A (en) 1949-11-30 1949-11-30 Improvements relating to circuits for generating electrical sawtooth oscillations

Publications (1)

Publication Number Publication Date
US2622227A true US2622227A (en) 1952-12-16

Family

ID=10311346

Family Applications (1)

Application Number Title Priority Date Filing Date
US196780A Expired - Lifetime US2622227A (en) 1949-11-30 1950-11-21 Circuits for generating saw tooth oscillations

Country Status (5)

Country Link
US (1) US2622227A (en(2012))
DE (1) DE903844C (en(2012))
FR (1) FR1028440A (en(2012))
GB (1) GB689316A (en(2012))
NL (1) NL83733C (en(2012))

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2228266A (en) * 1939-07-01 1941-01-14 Bell Telephone Labor Inc Signal translating apparatus
US2230819A (en) * 1938-08-23 1941-02-04 Emi Ltd Thermionic valve circuits
US2251851A (en) * 1939-06-16 1941-08-05 Philco Radio & Television Corp Electron-beam deflecting circuit
US2280733A (en) * 1939-06-30 1942-04-21 Rca Corp Deflecting circuits
US2305919A (en) * 1941-09-25 1942-12-22 Rca Corp Deflection circuit
US2414546A (en) * 1942-01-06 1947-01-21 Westinghouse Electric Corp Television sweep circuits
US2460540A (en) * 1946-02-26 1949-02-01 Rca Corp Control circuit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230819A (en) * 1938-08-23 1941-02-04 Emi Ltd Thermionic valve circuits
US2251851A (en) * 1939-06-16 1941-08-05 Philco Radio & Television Corp Electron-beam deflecting circuit
US2280733A (en) * 1939-06-30 1942-04-21 Rca Corp Deflecting circuits
US2228266A (en) * 1939-07-01 1941-01-14 Bell Telephone Labor Inc Signal translating apparatus
US2305919A (en) * 1941-09-25 1942-12-22 Rca Corp Deflection circuit
US2414546A (en) * 1942-01-06 1947-01-21 Westinghouse Electric Corp Television sweep circuits
US2460540A (en) * 1946-02-26 1949-02-01 Rca Corp Control circuit

Also Published As

Publication number Publication date
GB689316A (en) 1953-03-25
FR1028440A (fr) 1953-05-22
DE903844C (de) 1954-02-11
NL83733C (en(2012))

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