US2621237A - Electron discharge tube circuits for generating electrical oscillations of saw-tooth wave form - Google Patents
Electron discharge tube circuits for generating electrical oscillations of saw-tooth wave form Download PDFInfo
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- US2621237A US2621237A US181136A US18113650A US2621237A US 2621237 A US2621237 A US 2621237A US 181136 A US181136 A US 181136A US 18113650 A US18113650 A US 18113650A US 2621237 A US2621237 A US 2621237A
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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
- H03K4/90—Linearisation of ramp; Synchronisation of pulses
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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
- H03K4/28—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 a switching device
- H03K4/32—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 a switching device combined with means for generating the driving pulses
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- This invention relates to electron discharge tube circuits for generating oscillations of sawtooth waveform. Such circuits are used for example in television for the purpose of reflecting the beam of a cathode ray tube.
- a type of circuit which employs two tubes in this manner is one which operates on the resonant return principle in which a sawtooth current is set up in inductive scanning coils associated with a cathode ray tube and in which the short flank of the sawtooth oscillations is obtained by allowing the current in the coils to execute a free half-cycle of oscillation at the end of the long flank of the sawtooth oscillation.
- one of the aforesaid tubes is employed to prevent further free oscillation by becoming conducting, this tube during its conducting period generating the initial portion of the long flank of the sawtooth oscillation after which the other tube becomes conducting for generating the remaining portion of the long flank.
- the tube which prevents further oscillation is usually called the damper tube and the other tube is usually called the driver tube since this latter tube has applied thereto suitable controlling voltages which serve to render the valve conducting in an appropriate manner for the generation of the sawtooth oscillations.
- the driver tube may be non-conducting for as much as the first 50 per cent of the long flank of the generated oscillation. It is of course well recognised that it is desirable for the long flank of the generated oscillations to be linear throughout its whole stroke but it is found with the circuits described above that the initial portion of the long flank is somewhat curved.
- the drawing illustrates a circuit according to the invention which operates on the resonant return principle and mainly diifers from the circuits shown in Figures 1 and 2 of the drawings "of said co-pending' application in that the negagenerating controlling voltages which in this case,
- the reference numeral l3 illustrates the driver tube and the reference numeral It the damper tube.
- the driver tube I3 is a tetrode and its anode is connected to the positive terminal of a source of anode current indicated at l5 through a resistance l5, which serves to suppress parasitic oscil lations, the primary Winding I! of a transformer and a decoupling resistance i8 which is decoupled to earth by a condenser I9.
- the secondary winding 20 of the transformer feeds current to the scanning coils 2! through a resistance 22, the resistance of the scanning coils being indicated by the resistance 23.
- the damper tube I4 is shunted across the scanning coils 2!, and is shown as a triode.
- Control voltages are applied to the control electrodes of the tubes I3 and I4, said control voltages being derived from a double triode tube 25!.
- the tubes l3 and M have their cathodes connected to earth'through resistances 25 and 26 respectively which serve to make the characteristics of said tubes more linear.
- the common cathode of tube 25 is connected through a resistance 21 to a source of negative potential, the resistance 21 serving to cause the tube 2a to function as a push-pull cathode coupled amplifier. Assuming that the scanning coils 2 l were ideal and that the tubes l3 and It were also ideal i. e.
- the voltage across said coils in order to set up a truly linear sawtooth current in the coils, would be a constant voltage so that the control voltages derived from the tube 24 and which are fed. to the control electrodes of the tubes l3 and It would, in this case, be constant and no negative feedback voltage would be required.
- the control voltages derived from the tube 24 and which are fed. to the control electrodes of the tubes l3 and It would, in this case, be constant and no negative feedback voltage would be required.
- the scanning coils do not represent an ideal inductance and the tubes possess internal impedance and, accordingly, the control voltages applied to the tubes 13 and M are modified by a negative feedback voltage,.such negative feedback voltage being substantially proportional to the voltage set up across said scanning coils.
- the negative feedback voltage is derived, as shown, from the upper end of the scanning coils 2
- the other control electrode'of the tube 24 is connected to earth through a resistance 3!
- the junction between the. condenserztaand resistance 29 is connected to a resistance 3
- the condenser 28 andresistance 31 form a time constant circuit in the-feedback path feeding the voltage derived from the upper end of the scanning coils 2
- The: tube .24 functions zasapushrpullamplifier and the control yoltages which zarezzsetzup. :in-Lthe anode circuits of .the
- l anodeAE is connected to.
- the control electrode of theatube: l4 through a resistance I353 shunted by a bypass condenser 59,- the resistance li being connected, to the junction of 1 a.
- the resistancesllfi and 52 serving to apply an appropriatev biassing potential to the tube M.
- the potentialfor thescreening electrode of thetube l3 is .derived from the positive potential source I5 through a resistance 53, the screening electrode .beingdecoupledto thecathodeof the tube l3 through condenser 56.
- Thecircuit shown is syn- Between the 'recchronised by applying to the control electrode of the tube I3 synchronising pulses which are set up at the anode of a tube 55 which may be the output tube of a multivibrator or other source of pulses, the anode of thetube 55 deriving its anode potential from a resistance 56 connected tothe junction point of the resistances and 3E.
- the condenser 44 serves to prevent undesired oscillations which may be otherwise set up due to phase shift in the feedback network and the rec- 'tifiertuserves'to isolate the condenser 64 from the tube when a pulse is set up at the anode 'ofsaid tubeso as to prevent delay in the builda pulse is applied to the control'electrode of the .tube i3 from the tube the tube [3 is rendered non conducting and the current in the scanning coils 2i is then permitted. toexecutea half-cycle ofxosei'llation after which the tube l4 becomes conducting to permitthe'generation of the initial portion of the-long flank of the sawtooth current across the coils 2i, this'portion'of the long.
- the resistance. 46 is made considerably smaller .thanthe. resistance-35 so that agreater' degree vent undesired oscillations from occurring.
- Theci-rcuitshown in Figure 1 may be modified as shown in Figure 2- by providing a resistance ii? in the anode :circuit of: the tube l4 and then connecting .the upper-end of the scanning coils 2i to'the. junction of the resistance-'57- andthe anode ofthe tubeal.
- a circuit for generating oscillations of sawtooth waveform .in a load comprising a pair of tubes each having a control-electrode, a source of control voltage, means. for applying a control voltage'frorn said sourceto one of said tubes to control the generation of the initial portion of the long flank of .a-sawtooth oscillationymeans for applying a control voltage from said source to the other tube to control the subsequent portion of said long flank, a connection from said load to provide a negative feedback voltage substantially proportional to the Voltage set up across said load, said source of control voltage including a constant voltage, and means for obtaining the difference between said negative feedback voltage and said constant voltage to derive said control voltage modified to linearize both the initial and subsequent portions of said long flank.
- a circuit for generating oscillations of sawtooth waveform in an inductive load comprising a driver tube having a control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage, means to provide a negative feedback voltage substantially proportional to the voltage set up across said load, said source of control voltage including a constant voltage, means for obtaining the difference between said negative feedback voltage and said constant voltage to derive said control voltage, and means for applying said control voltage to the control electrodes of said driver and damper tubes to linearize both said portions of said long flank.
- a circuit for generating oscillations of sawtooth waveform in a load comprising a pair of tubes each having a control electrode, a source of control voltage, means for applying a control voltage from said source to one of said tubes to control the generation of the initial portion of the long flank of a sawtooth oscillation, means for applying a control voltage from said source to the other tube to control the subsequent portion of said long flank, said source including a push-pull amplifier for generating said control voltage, a connection from said load to said amplifier to provide a negative'feedback voltage substantially proportional to the voltage set up across said load, means for applying said feedback voltage to said amplifier to obtain a control voltage dependent on the difference between said negative feedback voltage and a constant voltage, and means for applying said control voltage in push-pull to said tubes to linearize both the initial and subsequent portions of said long flank.
- a circuit for generating oscillations of sawtooth waveform in an inductive load comprising a driver tube having a, control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage including push-pull amplifier, means coupling said load to said source to provide a negative feedback voltage substantially proportional to the voltage set up across said load, means for applying said feedback voltage to said amplifier to obtain control voltage dependent on the difference between said negative feedback voltage and a constant voltage, and means for applying said control voltage in push-pull to said tubes to linearize both said portions of said long flank.
- a circuit for generating oscillations of sawtooth waveform in an inductive load which includes a resistive component, comprising a driver tube having a control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a, free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said lonk flank, said damper tube having a control electrode, a source of control voltage, means coupling said load to said source to provide negative feedback voltage substantially proportional to the voltage set up across said load, said source of control voltage including a constant voltage, means for obtaining the diflerence between said negative feedback voltage and said constant voltage to derive said control voltage, and means for applying said control voltage to the control electrodes of said driver and damper tubes to linearize both said portions of said long flank, said coupling means including a time constant network to
- a circuit for generating oscillations of sawtooth Waveform in an inductive load which includes a resistive component, comprising a driver tube having a control electrode, means for rendering said tube conductive to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage including a push-pull amplifier, means coupling said load to said source to provide a negative feedback voltage substantially proportional to the voltage set up across said load, means for applying said feedback voltage to said amplifier to obtain a control voltage dependent on the difference between said negative feedback voltage and a constant voltage, and means for applying said control voltage in push-pull to said tubes to linearize both the initial and subsequent portions of said long flank, said coupling means including a time constant network to compensate
- a circuit for generating oscillations of sawtooth waveform in an inductive load comprising a driver tube having a control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage, means coupling said load to said source to provide negative feedback voltage substantially proportional to the voltage set up across said load, said source of control voltage including a constant voltage, means for obtaining the difference between said negative feedback voltage andusaid constant voltage toderive saidcontrol voltage, and means for applying said control voltage to the control electrodes .ofsaid driver and damper tubes to linearize both portions of said long flank, said damper tube having ananode coupled to said load through a resistance, and one end. of said
- a circuit for generating oscillations of savvtcoth waveformin an inductive load comprising a driver tube having a control electrode, means for renderingsaidtube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of the current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage including a push-pull amplifier, means coupling said load to said source to provide a negative feedback voltage substantially proportional to the voltage set up acrosssaid load, said source of control voltage including a constant voltage, means for obtaining the difierence between said negative feedback voltage and said constant voltage to derive said control voltage, and means for applying said control voltage in push-pull to said tubes'to linearize both said portions of .said long flank, said damper tube having an an
Description
Dec. 9, 1952 HUNTLEY 2,621,237 ELECTRON DISCHARGE TUBE CIRCUITS FOR GENERATING ELECTRICAL OSCILLATIONS OF SAW TOOTH WAVE FORM Filed Aug. 24, 1950 FIG.
lnvehfa, KEITH GORDON HUNTLEY Af/v iney Patented Dec. 9, 1952 FHQE ELECTRON DISCHARGE TUBE CIRCUITS FOR GENERATING ELECTRICAL OSCILLA'KIONS OF SAW-TOOTH WAVE FORM Keith Gordon Huntley, Harlington, Hayes, England, assignor to Electric & Musical Industries Limited, Hayes, Middlesex, England Application August 24, 1950, Serial No. 181,186 In Great Britain September 22, 1949 8 Claims. 1
This invention relates to electron discharge tube circuits for generating oscillations of sawtooth waveform. Such circuits are used for example in television for the purpose of reflecting the beam of a cathode ray tube.
In a known circuit two tubes are employed for generating the long flank of the sawtooth oscillations, one of the tubes being conducting for one portion of said long flank and the other tube being conducting for the other, portion of the long flank. A type of circuit which employs two tubes in this manner is one which operates on the resonant return principle in which a sawtooth current is set up in inductive scanning coils associated with a cathode ray tube and in which the short flank of the sawtooth oscillations is obtained by allowing the current in the coils to execute a free half-cycle of oscillation at the end of the long flank of the sawtooth oscillation. In such a circuit one of the aforesaid tubes is employed to prevent further free oscillation by becoming conducting, this tube during its conducting period generating the initial portion of the long flank of the sawtooth oscillation after which the other tube becomes conducting for generating the remaining portion of the long flank. In this resonant return type of circuit, the tube which prevents further oscillation is usually called the damper tube and the other tube is usually called the driver tube since this latter tube has applied thereto suitable controlling voltages which serve to render the valve conducting in an appropriate manner for the generation of the sawtooth oscillations. In some circuits of this type when employed for generating oscillations at line frequency in a television receiver the driver tube may be non-conducting for as much as the first 50 per cent of the long flank of the generated oscillation. It is of course well recognised that it is desirable for the long flank of the generated oscillations to be linear throughout its whole stroke but it is found with the circuits described above that the initial portion of the long flank is somewhat curved.
In the United States co-pending Application Serial No. 128,598, filed November 21, 1949 by J. E. Best and R. C. White, circuits are disclosed for making the initial portion of the long flank more linear. The present invention seeks to provide improvements in said circuits.
In order that the invention may be clearly understood and readily carried into eiTect, it will now be more fully described with reference to the accompanying drawing, in which Figure 1 illustrates an embodiment of the present invention and Figure 2 illustrates a part of the circuit shown in Figure 1 embodying a modification.
The drawing illustrates a circuit according to the invention which operates on the resonant return principle and mainly diifers from the circuits shown in Figures 1 and 2 of the drawings "of said co-pending' application in that the negagenerating controlling voltages which in this case,
in the absence of negative feedback, are substantially constant voltages but which are modified by the negative feedback voltage to set up substantially sawtooth voltages for application to the driver and damper tubes.
As shown in Figure l in the drawing the reference numeral l3 illustrates the driver tube and the reference numeral It the damper tube. The driver tube I3 is a tetrode and its anode is connected to the positive terminal of a source of anode current indicated at l5 through a resistance l5, which serves to suppress parasitic oscil lations, the primary Winding I! of a transformer and a decoupling resistance i8 which is decoupled to earth by a condenser I9. The secondary winding 20 of the transformer feeds current to the scanning coils 2! through a resistance 22, the resistance of the scanning coils being indicated by the resistance 23. The damper tube I4 is shunted across the scanning coils 2!, and is shown as a triode. Control voltages are applied to the control electrodes of the tubes I3 and I4, said control voltages being derived from a double triode tube 25!. The tubes l3 and M have their cathodes connected to earth'through resistances 25 and 26 respectively which serve to make the characteristics of said tubes more linear. The common cathode of tube 25 is connected through a resistance 21 to a source of negative potential, the resistance 21 serving to cause the tube 2a to function as a push-pull cathode coupled amplifier. Assuming that the scanning coils 2 l were ideal and that the tubes l3 and It were also ideal i. e. have zero internal impedance, then the voltage across said coils, in order to set up a truly linear sawtooth current in the coils, would be a constant voltage so that the control voltages derived from the tube 24 and which are fed. to the control electrodes of the tubes l3 and It would, in this case, be constant and no negative feedback voltage would be required. However,
"in thescanning coils 2|. components are'designed so that C2sR31=L21/R23.
the scanning coils do not represent an ideal inductance and the tubes possess internal impedance and, accordingly, the control voltages applied to the tubes 13 and M are modified by a negative feedback voltage,.such negative feedback voltage being substantially proportional to the voltage set up across said scanning coils. The negative feedback voltage is derived, as shown, from the upper end of the scanning coils 2|, and is applied through condenser 28 and through a resistance 29 to one of the control electrodes of the tube 24. The other control electrode'of the tube 24 is connected to earth through a resistance 3! The junction between the. condenserztaand resistance 29 is connected to a resistance 3| :to earth through a decoupling condenser 32, the junction point of the resistance 3! and condenser 32 being connected to a tapping point on a potentiometer 33 which is connected across a source of D. C. potential. The condenser 28 andresistance 31 form a time constant circuit in the-feedback path feeding the voltage derived from the upper end of the scanning coils 2| to thetube'illl so as'to impart acorrect shape'to this feedback voltage to compensate for the resistance: 23'. of: the scanning coils "and thus obtain the: required linearity of sawtooth current set up 'For this purpose the The tappingjpoint on the potentiometer '33 is adjustable for the;purposeof varying the slope .of ;.the. sawtooth current. The: tube .24 functions zasapushrpullamplifier and the control yoltages which zarezzsetzup. :in-Lthe anode circuits of .the
"tube 1.2 4-.':are..applied .as' aforesaid" to 'the -control .elec'itrodes;Qf." the tubes i3and H3.
1'34. of'the tube 2c is connected to thesource'of 1 positive potential: l through resistances 35' and The anode 36, the junction point of the resistances '35 and -3$:. being decoupled to earth througha condenser -3 'l. electrode'of the tube 13 through a rectifier 38 -whichimay be a-contact rectifier or a rectifier The anode 35 is connected to the control ofsome ,other'suitable form and a'resistance 39 "which. is shuntedby a bypass condenser 40, the
controkelectrode circuit of the tube 13 including I airesistance 4 l. and a resistance 42 to the junction of-"whichi the resistance as is connected, whilst thelowerqend of the resistance-42 is connected tora tapping point on a resistance 43 one end of.which-31s; connected to the negative terminal :of: a'sou-rce of: bias voltage whilst the other end source of anode potential through resistances "M5 and- 41 the junction'point of which-is decoupled-to earth through a condenser 43. The
l anodeAE is connected to. the control electrode of theatube: l4 through a resistance I353 shunted by a bypass condenser 59,- the resistance li being connected, to the junction of 1 a. resistance 5 Land -a resistance:52,.the other end ofv the latter being :connected to a source of negative potential, the
resistancesllfi and 52 serving to apply an appropriatev biassing potential to the tube M. The potentialfor thescreening electrode of thetube l3 is .derived from the positive potential source I5 through a resistance 53, the screening electrode .beingdecoupledto thecathodeof the tube l3 through condenser 56. Thecircuit shown is syn- Between the 'recchronised by applying to the control electrode of the tube I3 synchronising pulses which are set up at the anode of a tube 55 which may be the output tube of a multivibrator or other source of pulses, the anode of thetube 55 deriving its anode potential from a resistance 56 connected tothe junction point of the resistances and 3E.
The condenser 44 serves to prevent undesired oscillations which may be otherwise set up due to phase shift in the feedback network and the rec- 'tifiertuserves'to isolate the condenser 64 from the tube when a pulse is set up at the anode 'ofsaid tubeso as to prevent delay in the builda pulse is applied to the control'electrode of the .tube i3 from the tube the tube [3 is rendered non conducting and the current in the scanning coils 2i is then permitted. toexecutea half-cycle ofxosei'llation after which the tube l4 becomes conducting to permitthe'generation of the initial portion of the-long flank of the sawtooth current across the coils 2i, this'portion'of the long. flank being controlled and linearised by the negative feedback voltage fed to the tube-'24. This feedback voltage isuof course amplified by :thatube .24; and? serves to reduce thezeilective; impedance ..of. thetube l-il. so-..-that at substantiallyilinear. curzrentilcwsthroughthe-coils 2 l The.-.-D.71C.;bias applied-to; the tube; 5 3 is so adjusted. that before the tube-4 l is rendered'nonsconducting' the tube V i3-becon1es conducting so as to generate the subsequent portio-n ofthe long flank of thelsawtoothcurrent. This subsequent portion isualso lineariseddue to the-negative feedback which is amplified by thetubei l and fed from the anode 33"to the control'electrode-of tube 13. Upon the occurrence of a further pulse from the tube 55,
theltube 131-is' rendered non-conducting rand the :cycle recommences.
The resistance. 46 is made considerably smaller .thanthe. resistance-35 so that agreater' degree vent undesired oscillations from occurring.
Theci-rcuitshown in Figure 1 may be modified as shown in Figure 2- by providing a resistance ii? in the anode :circuit of: the tube l4 and then connecting .the upper-end of the scanning coils 2i to'the. junction of the resistance-'57- andthe anode ofthe tubeal. The resistance: 5li.is."made equal to i theeffective 'xanoderesistance .of the tubel i,.i. e., the actualanode resistance divided by the :gain of the feedback, loopz'so :that .the upper end of the coils 2l...is.:theneifeotively a point-of zero: impedance thus :Zfurther: improving .the. linearity of the *generated' sawtooth oscillations.
'W-hatI claim is: l. A circuit for generating oscillations of sawtooth waveform .in a load, comprising a pair of tubes each having a control-electrode, a source of control voltage, means. for applying a control voltage'frorn said sourceto one of said tubes to control the generation of the initial portion of the long flank of .a-sawtooth oscillationymeans for applying a control voltage from said source to the other tube to control the subsequent portion of said long flank, a connection from said load to provide a negative feedback voltage substantially proportional to the Voltage set up across said load, said source of control voltage including a constant voltage, and means for obtaining the difference between said negative feedback voltage and said constant voltage to derive said control voltage modified to linearize both the initial and subsequent portions of said long flank.
2. A circuit for generating oscillations of sawtooth waveform in an inductive load, comprising a driver tube having a control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage, means to provide a negative feedback voltage substantially proportional to the voltage set up across said load, said source of control voltage including a constant voltage, means for obtaining the difference between said negative feedback voltage and said constant voltage to derive said control voltage, and means for applying said control voltage to the control electrodes of said driver and damper tubes to linearize both said portions of said long flank.
3. A circuit for generating oscillations of sawtooth waveform in a load, comprising a pair of tubes each having a control electrode, a source of control voltage, means for applying a control voltage from said source to one of said tubes to control the generation of the initial portion of the long flank of a sawtooth oscillation, means for applying a control voltage from said source to the other tube to control the subsequent portion of said long flank, said source including a push-pull amplifier for generating said control voltage, a connection from said load to said amplifier to provide a negative'feedback voltage substantially proportional to the voltage set up across said load, means for applying said feedback voltage to said amplifier to obtain a control voltage dependent on the difference between said negative feedback voltage and a constant voltage, and means for applying said control voltage in push-pull to said tubes to linearize both the initial and subsequent portions of said long flank.
4. A circuit for generating oscillations of sawtooth waveform in an inductive load, comprising a driver tube having a, control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage including push-pull amplifier, means coupling said load to said source to provide a negative feedback voltage substantially proportional to the voltage set up across said load, means for applying said feedback voltage to said amplifier to obtain control voltage dependent on the difference between said negative feedback voltage and a constant voltage, and means for applying said control voltage in push-pull to said tubes to linearize both said portions of said long flank.
5. A circuit for generating oscillations of sawtooth waveform in an inductive load which includes a resistive component, comprising a driver tube having a control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a, free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said lonk flank, said damper tube having a control electrode, a source of control voltage, means coupling said load to said source to provide negative feedback voltage substantially proportional to the voltage set up across said load, said source of control voltage including a constant voltage, means for obtaining the diflerence between said negative feedback voltage and said constant voltage to derive said control voltage, and means for applying said control voltage to the control electrodes of said driver and damper tubes to linearize both said portions of said long flank, said coupling means including a time constant network to compensate for the resistive component of said load.
6. A circuit for generating oscillations of sawtooth Waveform in an inductive load which includes a resistive component, comprising a driver tube having a control electrode, means for rendering said tube conductive to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage including a push-pull amplifier, means coupling said load to said source to provide a negative feedback voltage substantially proportional to the voltage set up across said load, means for applying said feedback voltage to said amplifier to obtain a control voltage dependent on the difference between said negative feedback voltage and a constant voltage, and means for applying said control voltage in push-pull to said tubes to linearize both the initial and subsequent portions of said long flank, said coupling means including a time constant network to compensate for the resistive component of said load.
7. A circuit for generating oscillations of sawtooth waveform in an inductive load comprising a driver tube having a control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage, means coupling said load to said source to provide negative feedback voltage substantially proportional to the voltage set up across said load, said source of control voltage including a constant voltage, means for obtaining the difference between said negative feedback voltage andusaid constant voltage toderive saidcontrol voltage, and means for applying said control voltage to the control electrodes .ofsaid driver and damper tubes to linearize both portions of said long flank, said damper tube having ananode coupled to said load through a resistance, and one end. of said load being connected to the junction of said resistance and anode to maintain said end effectively at zero impedance.
8. A circuit for generating oscillations of savvtcoth waveformin an inductive load comprising a driver tube having a control electrode, means for renderingsaidtube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of the current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage including a push-pull amplifier, means coupling said load to said source to provide a negative feedback voltage substantially proportional to the voltage set up acrosssaid load, said source of control voltage including a constant voltage, means for obtaining the difierence between said negative feedback voltage and said constant voltage to derive said control voltage, and means for applying said control voltage in push-pull to said tubes'to linearize both said portions of .said long flank, said damper tube having an anodecoupled to said load through a resistance; and one end of said load being connected to the junction of said resistance and anode to maintain said end effectively at zero impedance.
KEITH GORDON HUNTLEY.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 2,251,851 Moore Aug. 5, 1941 2,284,378 Dome May 26, 1942 2,414,546 Nagel Jan. 21, 1947 2,440,418 Tourshou Apr. 27, 1948 2,440,786 Schade May 4, 1948 2,466,537 De Vore Apr. 5, 1949 2,466,784 Schade Apr. 12, 1949 2,482,737 Shaw Sept. 20, 1949 2,492,090. Bass Dec. 20, 1949 2,510,027 Torsch May 30, 1950 2,536,839 Clark 'Jan. 2, 1951 2,536,857 Schade Jan. 2, 1951 2,543,305 Schwarz Feb. 27, 1951 2,561,817 Parker July 24, 1951 2,574,732 Denton Nov. 13, 1951
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3049248A GB655790A (en) | 1948-11-24 | 1948-11-24 | Improvements in or relating to electron discharge tube circuits for generating electrical oscillations of sawtooth waveform |
| GB2621237X | 1949-09-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2621237A true US2621237A (en) | 1952-12-09 |
Family
ID=32299796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US181136A Expired - Lifetime US2621237A (en) | 1948-11-24 | 1950-08-24 | Electron discharge tube circuits for generating electrical oscillations of saw-tooth wave form |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2621237A (en) |
| DE (1) | DE863537C (en) |
| FR (1) | FR1000244A (en) |
| NL (1) | NL86383C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2712615A (en) * | 1952-01-25 | 1955-07-05 | Gen Electric | Cathode ray beam deflection circuits |
| US2795733A (en) * | 1953-03-10 | 1957-06-11 | Rca Corp | Signal generating systems |
| DE1010665B (en) * | 1953-07-17 | 1957-06-19 | Emi Ltd | Circuit for generating saw tooth-shaped currents |
| US2809326A (en) * | 1954-03-30 | 1957-10-08 | Howard D Gulnac | Electron beam deflection circuits |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2251851A (en) * | 1939-06-16 | 1941-08-05 | Philco Radio & Television Corp | Electron-beam deflecting circuit |
| 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 |
| US2440418A (en) * | 1946-03-09 | 1948-04-27 | Rca Corp | Cathode-ray beam deflecting circuit |
| US2440786A (en) * | 1943-06-30 | 1948-05-04 | Rca Corp | Cathode-ray beam deflecting circuits |
| US2466537A (en) * | 1947-02-28 | 1949-04-05 | Remington Rand Inc | Cathode-ray tube sweep circuit |
| US2466784A (en) * | 1945-01-13 | 1949-04-12 | Rca Corp | Cathode-ray beam deflecting circuit |
| US2482737A (en) * | 1948-05-14 | 1949-09-20 | Rca Corp | Television receiver horizontal deflection |
| US2492090A (en) * | 1948-11-03 | 1949-12-20 | Avco Mfg Corp | Automatic frequency control circuit for television deflecting systems |
| US2510027A (en) * | 1947-05-28 | 1950-05-30 | Rca Corp | Cathode-ray tube deflection system |
| US2536857A (en) * | 1949-05-24 | 1951-01-02 | Rca Corp | High-efficiency cathode-ray deflection system |
| US2536839A (en) * | 1949-05-24 | 1951-01-02 | Rca Corp | Power recovery cathode-ray beam deflection system |
| US2543305A (en) * | 1949-12-16 | 1951-02-27 | Avco Mfg Corp | Circuit for suppressing undesired oscillations in television receivers |
| US2561817A (en) * | 1950-02-02 | 1951-07-24 | Avco Mfg Corp | Automatic frequency control circuit |
| US2574732A (en) * | 1949-04-01 | 1951-11-13 | Rca Corp | Automatic control for wave forms |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB512519A (en) * | 1938-03-02 | 1939-09-19 | Baird Television Ltd | Improvements in or relating to magnetic deflecting arrangements for electron discharge devices |
-
0
- NL NL86383D patent/NL86383C/xx active
-
1949
- 1949-11-22 FR FR1000244D patent/FR1000244A/en not_active Expired
- 1949-11-25 DE DEE299A patent/DE863537C/en not_active Expired
-
1950
- 1950-08-24 US US181136A patent/US2621237A/en not_active Expired - Lifetime
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2251851A (en) * | 1939-06-16 | 1941-08-05 | Philco Radio & Television Corp | Electron-beam deflecting circuit |
| 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 |
| US2466784A (en) * | 1945-01-13 | 1949-04-12 | Rca Corp | Cathode-ray beam deflecting circuit |
| US2440418A (en) * | 1946-03-09 | 1948-04-27 | Rca Corp | Cathode-ray beam deflecting circuit |
| US2466537A (en) * | 1947-02-28 | 1949-04-05 | Remington Rand Inc | Cathode-ray tube sweep circuit |
| US2510027A (en) * | 1947-05-28 | 1950-05-30 | Rca Corp | Cathode-ray tube deflection system |
| US2482737A (en) * | 1948-05-14 | 1949-09-20 | Rca Corp | Television receiver horizontal deflection |
| US2492090A (en) * | 1948-11-03 | 1949-12-20 | Avco Mfg Corp | Automatic frequency control circuit for television deflecting systems |
| US2574732A (en) * | 1949-04-01 | 1951-11-13 | Rca Corp | Automatic control for wave forms |
| US2536857A (en) * | 1949-05-24 | 1951-01-02 | Rca Corp | High-efficiency cathode-ray deflection system |
| US2536839A (en) * | 1949-05-24 | 1951-01-02 | Rca Corp | Power recovery cathode-ray beam deflection system |
| US2543305A (en) * | 1949-12-16 | 1951-02-27 | Avco Mfg Corp | Circuit for suppressing undesired oscillations in television receivers |
| US2561817A (en) * | 1950-02-02 | 1951-07-24 | Avco Mfg Corp | Automatic frequency control circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2712615A (en) * | 1952-01-25 | 1955-07-05 | Gen Electric | Cathode ray beam deflection circuits |
| US2795733A (en) * | 1953-03-10 | 1957-06-11 | Rca Corp | Signal generating systems |
| DE1010665B (en) * | 1953-07-17 | 1957-06-19 | Emi Ltd | Circuit for generating saw tooth-shaped currents |
| US2809326A (en) * | 1954-03-30 | 1957-10-08 | Howard D Gulnac | Electron beam deflection circuits |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1000244A (en) | 1952-02-11 |
| DE863537C (en) | 1953-01-19 |
| NL86383C (en) |
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