GB1049857A - Sawtooth waveform generators - Google Patents

Sawtooth waveform generators

Info

Publication number
GB1049857A
GB1049857A GB33778/62A GB3377862A GB1049857A GB 1049857 A GB1049857 A GB 1049857A GB 33778/62 A GB33778/62 A GB 33778/62A GB 3377862 A GB3377862 A GB 3377862A GB 1049857 A GB1049857 A GB 1049857A
Authority
GB
United Kingdom
Prior art keywords
scr1
transistor
voltage
circuit
series
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
GB33778/62A
Inventor
Michael Ralph Sibley
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
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB33778/62A priority Critical patent/GB1049857A/en
Priority to DEE25452A priority patent/DE1232192B/en
Priority to FR946418A priority patent/FR1368485A/en
Publication of GB1049857A publication Critical patent/GB1049857A/en
Expired legal-status Critical Current

Links

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
    • H03K4/085—Protection of sawtooth generators
    • 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
    • H03K4/62—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 using a semiconductor device operating as a switching device
    • 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
    • H03K4/62—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 using a semiconductor device operating as a switching device
    • H03K4/64—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 using a semiconductor device operating as a switching device combined with means for generating the driving pulses
    • 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
    • H03K4/83—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices with more than two PN junctions or with more than three electrodes or more than one electrode connected to the same conductivity region

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Television Receiver Circuits (AREA)
  • Dc-Dc Converters (AREA)

Abstract

1,049,857. Semi-conductor sawtooth generating circuits. ELECTRIC & MUSICAL INDUSTRIES Ltd. Aug. 27, 1963 [Sept. 4, 1962], No. 33778/62. Heading H3T. In a sawtooth generator comprising a transistor in series with an inductor, the voltage across the transistor during the flyback period is reduced by connecting a silicon controlled rectifier in the circuit. In the line timebase circuit shown for a television receiver, the deflection coils L are connected in series with a transistor TR1 and a controlled rectifier SCR1 across a D.C. supply between terminals 2, 4. Control pulses are fed to terminal 1 and passed by emitter followers TR2, TR3 to switch on TR1 and SCR1, thus giving a linear rise of current in the coils L. TR1 is turned off at the end of each pulse at 1 so that the circuit L, C executes a half-cycle of oscillation during the flyback period, energy being returned to the supply by the efficiency diode D1 SCR1 becomes non-conductive when its anode current falls to a sufficiently low level. Resistors R4, R5 arrange that the flyback voltage divides between SCR1 and TR1 in the ratio 10: 1. The control voltage for SCR1 is limited by a Zener diode ZD1. TR1 may be replaced by an oppositely connected PNP transistor if the control pulses are coupled to the base by a transformer.
GB33778/62A 1962-09-04 1962-09-04 Sawtooth waveform generators Expired GB1049857A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB33778/62A GB1049857A (en) 1962-09-04 1962-09-04 Sawtooth waveform generators
DEE25452A DE1232192B (en) 1962-09-04 1963-09-03 Saw tooth generator
FR946418A FR1368485A (en) 1962-09-04 1963-09-03 Semiconductor circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB33778/62A GB1049857A (en) 1962-09-04 1962-09-04 Sawtooth waveform generators

Publications (1)

Publication Number Publication Date
GB1049857A true GB1049857A (en) 1966-11-30

Family

ID=10357308

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33778/62A Expired GB1049857A (en) 1962-09-04 1962-09-04 Sawtooth waveform generators

Country Status (3)

Country Link
DE (1) DE1232192B (en)
FR (1) FR1368485A (en)
GB (1) GB1049857A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1293203B (en) * 1967-04-05 1969-04-24 Standard Elektrik Lorenz Ag Horizontal deflection circuit for television receivers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921231A (en) * 1958-03-24 1960-01-12 Rca Corp Television deflection circuits
FR1282183A (en) * 1960-12-09 1962-01-19 Radiotechnique Switching device on inductive load by means of transistors connected in series

Also Published As

Publication number Publication date
DE1232192B (en) 1967-01-12
FR1368485A (en) 1964-07-31

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