US2105902A - Periodic voltage generator - Google Patents

Periodic voltage generator Download PDF

Info

Publication number
US2105902A
US2105902A US64022A US6402236A US2105902A US 2105902 A US2105902 A US 2105902A US 64022 A US64022 A US 64022A US 6402236 A US6402236 A US 6402236A US 2105902 A US2105902 A US 2105902A
Authority
US
United States
Prior art keywords
periodic
circuits
current
pair
generator
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
US64022A
Other languages
English (en)
Inventor
Cawein Madison
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.)
BAE Systems Aerospace Inc
Original Assignee
Hazeltine Corp
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
Priority to NL47553D priority Critical patent/NL47553C/xx
Application filed by Hazeltine Corp filed Critical Hazeltine Corp
Priority to US64022A priority patent/US2105902A/en
Priority to GB2666/37A priority patent/GB489625A/en
Priority to DE1937H0150624 priority patent/DE688088C/de
Priority to FR817870D priority patent/FR817870A/fr
Application granted granted Critical
Publication of US2105902A publication Critical patent/US2105902A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H03K4/12—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 voltage is produced across a capacitor

Definitions

  • FIG. I IO ⁇ I2 [l5 [l4 [l5 CARRIER T VIDEO CATHODE FREQUENCY DETECTOR FREQUENCY RAY AMPLIFIER w AMPLIFIER TUBE l6 f PICTURE FREQUENCY. GENERATORR INVENTOR.
  • n picture or video-frequency signals corresponding 116K166 an Operating voltage may be used for h to the varying values of light and shade in the generator which is of an amplitude of only onet itt picture, Scanning synchronizing imhalf that which would be needed if a single un- 10 pulses are also transmitted, usually also as modubalanced Scanning Voltage were to be developedlation frequencies impressed on the same tele- Furthermore, any electrostatic and magnetic disvision carrier as the video frequencies. A cathturbances to which the voltage supply circuits ode-ray tube is employed at the receiver, whercare subjected will be balanced out or neutralized in a cathode ray.
  • Voltages fln is p y atvideo frequencies, derived from the received It is an object of the present invention to carrier, are utilized to vary the intensity or the provide an improved generator for d veloping ray according to the signal amplitude. In order p riodic voltages which are of balanced, and h to effect scanning of the screen by the ray, sawp ly f wooth, w v form.
  • a periodic voltage generator rived from the carrier are utilized to control or which includes capacitance means, as for example operate the scanning wave generators so that the a condenser, and a source of direct current.
  • a 30 scanning actions at the receiver are maintained in pair of circuits is provided for charging the caproper synchronism with the corresponding acpacitance means to opposite polarities from the tions at the transmitter.
  • direct-current source, and means-are are provided
  • relatively high voltages are for controlling the circuits, periodically to charge employed for the electrodes of the cathode-ray the capacitance means alternately to opposite 5 tube, as ior focusing the ray, and correspondingpolarities.
  • One of the circuits includes two imly high scanning voltages are, therefore, required.
  • pedance means of substantially equal values and It is, of course, essential that the saw-tooth scansymmetrically disposed in the circuit for the ning voltages be of such wave term as to effect periodic current th r in.
  • the scanning voltage generators be relationship whereby corresponding portions of relatively simple in their construction and operthe elements, in connection with which the term ation. is employed, are always at equal and opposite Because 01 inherent electrostatic and magnetic periodic voltages with respect to ground.
  • Suitable means as for example a regenerating tube, may be provided for of a cathode-ray tube, to eifect scanning by the ray.
  • FIG. 2 is a graph of the balanced sawtooth voltages developed by the generator shown Fig; 1.
  • the voltage generator l1 comprises capacitance means, more particularly a condenser III, and a direct-current source, such I9. by-Da Scd for periities.
  • one of the charging circuits of the condenser l8 includes thecontrol means,
  • a regenerating tube 25 For regenerating the operation of the tubes 20 and 2
  • the cathode of the tube 25 is grounded and its control grid circuit includes a suitable biasing resistor 29.
  • the anode of the tube 25 is connected'directly to the control grid of the tube 2
  • opposite terminals of the condenser Il may be connected, by'way of coupling condensers 31 and 33, directly to the scanning or deflecting elements of the cathode-ray tube i5.
  • a pair of serially-connected resistors 39 and ill having their junction grounded for periodiccurrents is connected across the load may be grounded, for direct current also, as shown, or may be maintained at any suitable direct voltage with reference to the operating voltages of the electrodes of the cathode-ray tube.
  • the grid of the tube 23 becomes negative with respect to its cathode by an amount approaching the voltage drop across the resistor 3 I while the grid of the tube 20 becomes negative relative to its cathode by an amount approaching through the resistor 25.
  • the tubes 23 and 2i are thus rendered-non-conductive and the charging of the condenser 13 to the opposite polarity is tial polarity, since the impedance of the circuit including the tubes 32 and 33 is very much higher than that of the circuit including the tubes 20 and M.
  • the charging of the capacitance means or condenser IB alternately to opposite polarities is periodic and the action is synchronized by virtue of the synchronizing impulse voltages which are applied negatively to the control grid of the tube 25 from the video-frequency amplifier, by way of the coupling condenser 21 and voltage divider 25.
  • the circuit constants are so selected that the voltage built up across the tubes 23 and 2i during the trace is justshort of breaking down these tubes with normal grid voltages applied.
  • the grid voltage of the tube of" a negative synchronizing impulse, the conductanceof the tube 25 is suddenly decreased and its anode voltage raised.
  • are increased positively to such a value that their existing anode voltages are suflicient to break them down.
  • the effectiveness, on the control of the tube 25, of the synchronizing voltage impulses from the video-frequency amplifier I4 and the voltage developed across resistor 22 may be controlled simultaneously and in opposite senses by adjustment of the tap on the voltage divider. Properly synchronized operation of the generator may thus be obtained.
  • suitable discriminating means will be included in the input circuit of the generator H5 or II, or both, to en.- sure that each is controlled only by its respective synchronizing impulses. Since the impedances of the tubes 32 and 33 are of substantially equal values, as are the resistors 34 and 35.
  • the alternating voltage developed across the condenser I8 is substantially balanced with respect to ground.
  • This voltage is impressed across the resistors 39 and 40 and is sent time and the ordinates represent amplitude. Relative polarities are indicated as and and ground is indicated as 0.
  • the received synchronizing voltage impulsessupplied by thevideofrequency amplifier determine the frequency at the generator, and the constants of the circuit determine the amplitude of the resultant voltages til 'the bias impressed thereon from the battery l3 1 their respective charging circuits for the periodic developed.
  • the curves 4
  • a periodic voltage generator comprising capacitance means, a direct-current circuit, a pair 4 of circuits for charging said capacitance means to opposite polarities from said direct-current circuit, means for controlling said pair of circuits I periodically to effect alternate charges of said capacitance means toopposite polarities, one. of the circuits of said pair including two impedance means of substantially equal values and symmetrically disposed therein for the periodic current of said generator, and an output circuit in which the periodic voltages developed across said impedance means appear as balanced oppositely poled voltages.
  • a periodic voltage generator comprising capacitance means, a direct-current circuit, a'pair of circuits for charging said capacitance means to opposite polarities from said direct-current circuit, means for controlling said pair of cir- I cuits periodically to eifect alternate charges of means to opposite polarities from said direct-current circuit, means for controlling said pair of said capacitance means to opposite polarities, one of the circuits of said pair including two impedance means of substantially equal values and symmetrically disposed therein for the periodic current of said generator, at least one of said impedance means being adapted to maintain the current in said circuit substantially constant, and an output circuit in which the periodic voltages developed across said impedance means appear as balanced oppositely poled voltages.
  • a periodic voltage generator comprising capacitance means, a direct-current circuit, a pair of circuits for charging said capacitance means to opposite polarities from said direct-current cir cuit, means for controlling said pair of circuits periodically to,efiect'alternate charges of said capacitance means to opposite polarities, one of the circuits of said pair including two impedance means of substantiallyequal values and symmetrically disposed therein for the periodic current of said generator, each of said impedance means comprising a constant-currentdevicefor -maintaining the current in'said circuit substantially constant, and an output circuit in which the periodic voltages developed across said impedance means appears as balanced oppositely poled voltages.
  • a periodic voltage generator comprising capacitance means, a direct-current circuit, a pair of circuits for charging said capacitance circuits periodically to effect alternate charges of said capacitance means to opposite polarities, one ofthe circuits of said pair including two impedance means of substantially equal values and symmetrically disposed therein for the periodic current of said generator, each of said impedance means including the space-current path of a pentode tube, means for applying potentials to the electrodes of said tubes whereby they are eflective to maintain the current in saidcircuit which the periodic voltages developed across said impedance means appear as balanced oppositely poled voltages.
  • a periodic voltage generator comprising capacitance means, a direct-current circuit, a pair of circuits for charging said capacitance means to opposite polarities from said direct-current circuit, means for controlling said pair of circuits periodically to efi'ect alternate charges of said capacitance means to opposite polarities, one of the circuits of said pair including two unilaterally conductive impedance means of substantially equal impedance values, said impedance means being symmetrically disposed for the periodic current of said generator, and an output circuit in which the periodic voltagm developed across said impedance means appear as balanced oppositely poled voltages.
  • a periodic voltage generator comprising capacitance means, a direct-current circuit, a
  • a periodic voltage generator comprising capacitance means, a direct-current circuit, a
  • pair of circuits for charging said capacitance means to opposite, polarities from said directcurrent circuit, means for controlling said pair of circuits periodically to efiect alternate charges of said capacitance means to opposite polarities comprising, in one of the circuits of said pair, two impedance means of substantially equal values and symmetrically disposed therein for theperiodic current of said generator and, in the other of the circuits of said pair, the space current paths of two vacuum tubes each having a control electrode, said tubes being serially connected and symmetrically disposed therein for the periodic, current of said generator, means for energizing said control electrodes with synchronizing voltage impulses, and an output circapacitance means, a
  • a periodic voltage generator comprising direct-current circuit, ,a pair of circuits for charging said capacitance means to opposite polarities from said direct-current circuit, means for controlling said circuits periodically to effect alternate charges of said capacitance means to opposite polarities comprising, in one of the circuits of said pair, two impedance means of substantially equal valuw and symmetrically disposed therein for the periodic current of said generator and, in the other of the circuits of said pair, the space-current paths of two vacuum tubes each having a controlelectrode, said tubes being serially connected and symmetrically disposed therein for the periodic current of said generator, means for energizing said control electrodes with synchronizing voltage impulses, means'associated with said tubes for regenerating the action thereof, and an output circuit in which the periodic voltages developed across said impedance means.
  • a periodic voltage generator comprising capacitance means, a direct-current circuit, a 'pair of circuits for charging said capacitance means to opposite polarities from said directcurrent circuit, means for controlling said pair or said capacitance means to opposite polarities comprising, in one of the circuits of said pair, two impedance means or substantially equal values and symmetrically disposed therein for the periodic current of said. generator and, in
  • MADISON CAWEIN p for the periodic current of said generator, means for energizing said control electrodes with synchronialng voltage impulses, a regenerating vacuum tube amplifier having its input circuit coupled to one or said circuits and itsv output circuit coupled to the control electrode of at least one of said charging tubes, and an output circuit in which the periodic voltages developed across said impedance means.
  • a periodic voltage generator for developing scanning voltages for the tube of said receiver comprising capacitance means, a direct-current circuit, a pair of circuits for charging said capacitance'means toopposite polarities from said direct-current circuit, means for controlling said pair of circuits periodically to effect alternate charges of said capacitance means to opposite polarities, one of the circuits of said pair including two impedance means of substantially equal values and symmetrically disposed therein for the periodic current of said generator, and an output circuit in which the periodic voltages-developed across said impedance means.
  • a periodic voltage generator comprising direct-current circuit, ,a pair of circuits for charging said capacitance means to opposite polarities from said direct-current circuit, means for controlling said circuits periodically to effect alternate charges of said capacitance means to opposite polarities comprising, in one of the circuits of said pair, two impedance means of substantially equal valuw and symmetrically disposed therein for the periodic current of said generator and, in the other of the circuits of said pair, the space-current paths of two vacuum tubes each having a controlelectrode, said tubes being serially connected and symmetrically disposed therein for the periodic current of said generator, means for energizing said control electrodes with synchronizing voltage impulses, means'associated with said tubes for regenerating the action thereof, and an output circuit in which the periodic voltages developed across said impedance means.
  • a periodic voltage generator comprising capacitance means, a direct-current circuit, a 'pair of circuits for charging said capacitance means to opposite polarities from said directcurrent circuit, means for controlling said pair or said capacitance means to opposite polarities comprising, in one of the circuits of said pair, two impedance means or substantially equal values and symmetrically disposed therein for the periodic current of said. generator and, in
  • MADISON CAWEIN p for the periodic current of said generator, means for energizing said control electrodes with synchronialng voltage impulses, a regenerating vacuum tube amplifier having its input circuit coupled to one or said circuits and itsv output circuit coupled to the control electrode of at least one of said charging tubes, and an output circuit in which the periodic voltages developed across said impedance means.
  • a periodic voltage generator for developing scanning voltages for the tube of said receiver comprising capacitance means, a direct-current circuit, a pair of circuits for charging said capacitance'means toopposite polarities from said direct-current circuit, means for controlling said pair of circuits periodically to effect alternate charges of said capacitance means to opposite polarities, one of the circuits of said pair including two impedance means of substantially equal values and symmetrically disposed therein for the periodic current of said generator, and an output circuit in which the periodic voltages-developed across said impedance means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Amplifiers (AREA)
  • Details Of Television Scanning (AREA)
US64022A 1936-02-15 1936-02-15 Periodic voltage generator Expired - Lifetime US2105902A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL47553D NL47553C (enrdf_load_stackoverflow) 1936-02-15
US64022A US2105902A (en) 1936-02-15 1936-02-15 Periodic voltage generator
GB2666/37A GB489625A (en) 1936-02-15 1937-01-29 Improvements in periodic voltage generator
DE1937H0150624 DE688088C (de) 1936-02-15 1937-02-14 Schaltung zur Erzeugung zweier gegenueber einem Bezugspotential, insbesondere Erde, spiegelbildlich symmetrischen Spannungen von nicht sinusfoermigem Verlauf mittels einer Kippschaltung
FR817870D FR817870A (fr) 1936-02-15 1937-02-15 Montage pour la production d'oscillations non sinusoïdales, en particulier pour la télévision

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US64022A US2105902A (en) 1936-02-15 1936-02-15 Periodic voltage generator

Publications (1)

Publication Number Publication Date
US2105902A true US2105902A (en) 1938-01-18

Family

ID=22053054

Family Applications (1)

Application Number Title Priority Date Filing Date
US64022A Expired - Lifetime US2105902A (en) 1936-02-15 1936-02-15 Periodic voltage generator

Country Status (5)

Country Link
US (1) US2105902A (enrdf_load_stackoverflow)
DE (1) DE688088C (enrdf_load_stackoverflow)
FR (1) FR817870A (enrdf_load_stackoverflow)
GB (1) GB489625A (enrdf_load_stackoverflow)
NL (1) NL47553C (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2458366A (en) * 1946-09-11 1949-01-04 Motorola Inc Saw-tooth voltage generator
US2597092A (en) * 1946-09-19 1952-05-20 Motorola Inc Vertical sweep generator
US2602890A (en) * 1947-11-01 1952-07-08 Bell Telephone Labor Inc Sweep circuit
US2646503A (en) * 1945-11-29 1953-07-21 Us Navy Balanced sweep circuit
US2677127A (en) * 1942-08-21 1954-04-27 Robert M Page Radio echo indicating apparatus
US2698400A (en) * 1947-06-03 1954-12-28 Sylvania Electric Prod Generator for dynamic focusing of cathode ray tubes
US2709746A (en) * 1948-11-02 1955-05-31 Westinghouse Electric Corp Pulse generator
US2836718A (en) * 1954-05-12 1958-05-27 Hughes Aircraft Co Pulse amplitude multiplier
US2886701A (en) * 1948-03-26 1959-05-12 Bell Telephone Labor Inc Zero direct current sweep circuit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677127A (en) * 1942-08-21 1954-04-27 Robert M Page Radio echo indicating apparatus
US2646503A (en) * 1945-11-29 1953-07-21 Us Navy Balanced sweep circuit
US2458366A (en) * 1946-09-11 1949-01-04 Motorola Inc Saw-tooth voltage generator
US2597092A (en) * 1946-09-19 1952-05-20 Motorola Inc Vertical sweep generator
US2698400A (en) * 1947-06-03 1954-12-28 Sylvania Electric Prod Generator for dynamic focusing of cathode ray tubes
US2602890A (en) * 1947-11-01 1952-07-08 Bell Telephone Labor Inc Sweep circuit
US2886701A (en) * 1948-03-26 1959-05-12 Bell Telephone Labor Inc Zero direct current sweep circuit
US2709746A (en) * 1948-11-02 1955-05-31 Westinghouse Electric Corp Pulse generator
US2836718A (en) * 1954-05-12 1958-05-27 Hughes Aircraft Co Pulse amplitude multiplier

Also Published As

Publication number Publication date
NL47553C (enrdf_load_stackoverflow)
GB489625A (en) 1938-07-29
DE688088C (de) 1940-02-12
FR817870A (fr) 1937-09-13

Similar Documents

Publication Publication Date Title
US2255484A (en) Automatic background control for television systems
US2252599A (en) Television receiver synchronizing system
US2286450A (en) Television receiving system
US2463685A (en) Automatic frequency control system
US2226706A (en) Periodic wave-generating system
US2255403A (en) Periodic wave repeater
US2105902A (en) Periodic voltage generator
US2191185A (en) Impulse generating arrangement
US2285043A (en) Television receiver
US2188653A (en) Electronic oscillation generator
US2137039A (en) Method and apparatus for communication by television
US2403549A (en) Modulation system for television
US2097334A (en) Control circuits for cathode ray devices
US2303909A (en) Transmission of electrical signals
US2180364A (en) Cathode ray sweep circuits
US2345668A (en) Impulse generator
US2183966A (en) Periodic wave-generating system
US2229964A (en) Television synchronizing system
US2052184A (en) Electric wave generator
US2118352A (en) Periodic voltage generator
US2240593A (en) Television synchronizing and control system
US2207499A (en) Cathode ray deflecting system
US2300452A (en) Combined power supply and scanning generator system
US2261762A (en) Interlaced scanning system
US2236066A (en) Television apparatus