GB894326A - Amplitude stabilized sawtooth current generator - Google Patents

Amplitude stabilized sawtooth current generator

Info

Publication number
GB894326A
GB894326A GB16373/60A GB1637360A GB894326A GB 894326 A GB894326 A GB 894326A GB 16373/60 A GB16373/60 A GB 16373/60A GB 1637360 A GB1637360 A GB 1637360A GB 894326 A GB894326 A GB 894326A
Authority
GB
United Kingdom
Prior art keywords
transistor
current
amplitude
sawtooth
resistor
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
Application number
GB16373/60A
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Publication of GB894326A publication Critical patent/GB894326A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
    • H04N3/223—Controlling dimensions
    • 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
    • H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
    • H03K4/50—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor
    • H03K4/54—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor using a single semiconductor device with positive feedback through a transformer, e.g. blocking oscillator
    • 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
    • H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
    • H03K4/60—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
  • Dc-Dc Converters (AREA)

Abstract

894,326. Transistor sawtooth generating circuits; cathode ray tube circuits. SYLVANIA ELECTRIC PRODUCTS Inc. May 9, 1960 [May 7, 1959], No. 16373/60. Classes 40(6) and 40(7). The sawtooth current generated in aninductive load is maintained constant in amplitude despite changes in frequency by means of a series transistor arranged to pass a constant emitter-collector current. The Figure shows a blocking oscillator transistor T1 having a feedback transformer AT, an output coil 2, a monitoring resistor 32 and a by-pass capacitor 20. During the conducting phase the transistor passes a steadily increasing current through the output inductor until at a value determined by resistor R1 the transistor ceases to be saturated whereupon by regenerative action the transistor is switched off and then on again producing the flyback. Adjustment of R1 varies the frequency oscillation and accompanying variations of amplitude are prevented by connecting in series with the collector circuit of a transistor T2 arranged to pass a constant current. The magnitude of this current and thus the amplitude of the sawtooth output wave may be varied by means of resistor R2 or modulated by source 53.
GB16373/60A 1959-05-07 1960-05-09 Amplitude stabilized sawtooth current generator Expired GB894326A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US811649A US3070756A (en) 1959-05-07 1959-05-07 Amplitude stabilized sawtooth current generator

Publications (1)

Publication Number Publication Date
GB894326A true GB894326A (en) 1962-04-18

Family

ID=25207150

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16373/60A Expired GB894326A (en) 1959-05-07 1960-05-09 Amplitude stabilized sawtooth current generator

Country Status (2)

Country Link
US (1) US3070756A (en)
GB (1) GB894326A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL289193A (en) * 1962-02-23
JPS60251777A (en) * 1984-05-29 1985-12-12 Sony Corp Amplitude detecting circuit of vertical deflection signal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL91359C (en) * 1953-06-19
US2847569A (en) * 1955-03-30 1958-08-12 Rca Corp Relaxation oscillator circuit
US2891192A (en) * 1955-09-30 1959-06-16 Rca Corp Sawtooth wave generator
US2939040A (en) * 1957-08-30 1960-05-31 Zenith Radio Corp Scanning generator

Also Published As

Publication number Publication date
US3070756A (en) 1962-12-25

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