US2544213A - Saw-tooth current oscillation generator - Google Patents

Saw-tooth current oscillation generator Download PDF

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Publication number
US2544213A
US2544213A US4588A US458848A US2544213A US 2544213 A US2544213 A US 2544213A US 4588 A US4588 A US 4588A US 458848 A US458848 A US 458848A US 2544213 A US2544213 A US 2544213A
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US
United States
Prior art keywords
electrode
cathode
oscillation generator
current oscillation
saw
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
US4588A
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English (en)
Inventor
Arthur J Bennett
Lax Ladislav
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.)
Pye Electronic Products Ltd
Original Assignee
Pye Ltd
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
Application filed by Pye Ltd filed Critical Pye Ltd
Application granted granted Critical
Publication of US2544213A publication Critical patent/US2544213A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H03K4/34—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 using a single tube with positive feedback through a transformer

Definitions

  • the present invention relates to a sawtooth current oscillation generator employing a single valve which serves the dual purpose of generating of sawtooth current oscillations and as an amplifier thereof.
  • This invention is directed to the linearisation of the oscillations in a single valve sawtooth current oscillation generator in which a substantially sawtooth current is produced in a network composed mainly of inductances.
  • FIG. 1 shows a basic circuit diagram of a sawtooth current generator
  • Figure 2 shows a graph and Figure 3 shows a circuit arrangement according to the invention.
  • Figure 1 shows a circuit arrangement for this purpose, which is suitable for producing the line oscillations in television receiving apparatus.
  • the circuit comprises a multi-grid valve V having two electrodes gl, g2 arranged between the cathode and anode, an inductance L being connected in the anode lead in which the amplified sawtooth oscillations are produced.
  • the inductance L may comprise the primary winding of the line scan transformer S, the secondary of which is connected to the line deflecting coils D of the cathode ray tube.
  • the transformer T provides a positive feedback between the two grid electrodes gl, 92. If the feedback is tight the dynamic characteristics of the grid volts (Eg2) to grid current (192) of the grid g2 will be as shown in Figure 2. This shape of characteristic, especially as regards the sections ab and bc, may be easily produced by employing a suitable transformer ratio and tightness of coupling. Between th points a and b the impedance of the electrode g2 is positive and thus Igz increases with EgZ. At point b the impedance increases. quickly to infinity and 102 remains substantially constant with increase of E92. The duration of the portion 120 is determined by the inductances and resistances in the circuit and the biases on the diiierent electrodes.
  • the impedance of electrode 92 becomes negative, and that section of the circuit begins to oscillate.
  • the voltage of electrode g2 increases quickly and that of electrode gl decreases until it finally cuts off the flow of elec- 2 trons in the valve.
  • the frequency of these oscillations is determined by the capacity Cl across the primary and secondary of the transformer T produced by the inter-electrode capacities'of the valve and the self-capacities of the transformer T.
  • the frequency may be controlled by variations of the resistance R I.
  • the potential on electrode gl is more positive than the cathode or established bias voltage.
  • the resistance R2 and condenser C2 serve to adjust the voltage on the electrode 92 to the correct value, as the impedance on g2 is positive, and the voltage on g! is positive, and the valve is conducting.
  • section ab may be made very steep so that IgZ suddenly rises to a high value and remains constant.
  • the voltage on electrode 92 increases, that on electrode gl decreases and changes the impedance of the anode circuit.
  • a third winding is, as shown in Figure 3, introduced on the feed back transformer T and connected in the cathode circuit in such a way that the potential changes on the electrode gl are followed by that on the cathode. This further increases the potential difference between the cathode and electrode 92, and partly counteracts the effects of finite resistances in the anode circuit.
  • a diode may be connected in various ways in that particular part of the circuit. In the circuit shown in Figure 3 the resistance R3 may be used as a frequency control.
  • the frequency of the oscillations generated by either embodiment may be synchronised by the application of negative pulses to the electrode 9! or positive pulses to the electrode g2.
  • a sawtooth current oscillation generator comprising a valve having at least two grid electrodes between the cathode and the anode, a source of high tension supply, a transformer having three mutually coupled windings, that one of the said two grids nearer to the cathode being connected to the negative high tension supply through one of said windings, the other grid of the valve being connected to the high tension positive supply through a second winding on said 3.
  • a generator according to claim 1 having a transformer and a series resistance, a condenser resistance included in the connection from the connecting the point of junction of said resistgrid electrode nearer to the cathode to ground. ance and said second Winding to a point of fixed potential, said first and second windings being 5 ARTHUR J. BENNETT. coupled to provide positive feed back between LADISLAV LAX.

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  • Details Of Television Scanning (AREA)
  • Amplifiers (AREA)
  • Generation Of Surge Voltage And Current (AREA)
US4588A 1947-02-01 1948-01-27 Saw-tooth current oscillation generator Expired - Lifetime US2544213A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3116/47A GB631972A (en) 1947-02-01 1947-02-01 Sawtooth current oscillation generator

Publications (1)

Publication Number Publication Date
US2544213A true US2544213A (en) 1951-03-06

Family

ID=9752214

Family Applications (1)

Application Number Title Priority Date Filing Date
US4588A Expired - Lifetime US2544213A (en) 1947-02-01 1948-01-27 Saw-tooth current oscillation generator

Country Status (5)

Country Link
US (1) US2544213A (fr)
DE (1) DE852586C (fr)
FR (1) FR960406A (fr)
GB (1) GB631972A (fr)
NL (1) NL85223C (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712606A (en) * 1949-10-07 1955-07-05 Du Mont Allen B Lab Inc Blocking tube oscillator
US2871355A (en) * 1955-02-24 1959-01-27 Gen Dynamics Corp Pulse generator
US2890330A (en) * 1953-03-23 1959-06-09 Rca Corp Signal amplifying systems
US2936383A (en) * 1956-10-23 1960-05-10 Jr Joseph Mees Transistor blocking oscillator
US2960603A (en) * 1957-03-04 1960-11-15 Bell Aerospace Corp Point light source
US3072802A (en) * 1959-01-14 1963-01-08 Burroughs Corp Pulse driver with magnetic amplitude and width control

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE961278C (de) * 1951-07-01 1957-04-04 Fernseh Gmbh Kippschaltung mit Transformatorgegenkopplung
DE958744C (de) * 1951-11-30 1957-02-21 Sueddeutsche Telefon App Kabel Selbstsperrender, durch Impulse synchronisierter Schwingungserzeuger

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB493142A (en) * 1938-02-24 1938-10-05 Ferranti Ltd Improvements in or relating to oscillation generators
US2212202A (en) * 1936-02-04 1940-08-20 Emi Ltd Electronic oscillation generator
US2303924A (en) * 1939-03-07 1942-12-01 Emi Ltd Television transmitting or receiving system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2212202A (en) * 1936-02-04 1940-08-20 Emi Ltd Electronic oscillation generator
GB493142A (en) * 1938-02-24 1938-10-05 Ferranti Ltd Improvements in or relating to oscillation generators
US2303924A (en) * 1939-03-07 1942-12-01 Emi Ltd Television transmitting or receiving system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712606A (en) * 1949-10-07 1955-07-05 Du Mont Allen B Lab Inc Blocking tube oscillator
US2890330A (en) * 1953-03-23 1959-06-09 Rca Corp Signal amplifying systems
US2871355A (en) * 1955-02-24 1959-01-27 Gen Dynamics Corp Pulse generator
US2936383A (en) * 1956-10-23 1960-05-10 Jr Joseph Mees Transistor blocking oscillator
US2960603A (en) * 1957-03-04 1960-11-15 Bell Aerospace Corp Point light source
US3072802A (en) * 1959-01-14 1963-01-08 Burroughs Corp Pulse driver with magnetic amplitude and width control

Also Published As

Publication number Publication date
FR960406A (fr) 1950-04-18
GB631972A (en) 1949-11-14
DE852586C (de) 1952-10-16
NL85223C (fr)

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