GB742134A - Control circuit including a semiconducting body - Google Patents

Control circuit including a semiconducting body

Info

Publication number
GB742134A
GB742134A GB23859/53A GB2385953A GB742134A GB 742134 A GB742134 A GB 742134A GB 23859/53 A GB23859/53 A GB 23859/53A GB 2385953 A GB2385953 A GB 2385953A GB 742134 A GB742134 A GB 742134A
Authority
GB
United Kingdom
Prior art keywords
current
transistor
load
pulse
capacitor
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
GB23859/53A
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 claimed from US308618A external-priority patent/US2728857A/en
Application filed by RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of GB742134A publication Critical patent/GB742134A/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
    • H03K4/48—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
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/68—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors specially adapted for switching ac currents or voltages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
    • H04N5/185—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit for the black level

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Processing Of Color Television Signals (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Electronic Switches (AREA)

Abstract

742,134. Transistor switching, amplifying and saw-tooth generating circuits. RADIO CORPORATION OF AMERICA. Aug. 28, 1953 [Sept. 9, 1952], No. 23859/53. Class 40 (6). In a control circuit, the load is connected between two similarly arranged electrodes on a transistor, current flow being controlled by a voltage applied to a third electrode. The circuit is particularly applicable to bi-directional switching using junction type transistors and is described as applied to a saw-tooth current-generating circuit for feeding the defection coils of a C.R.T. A continuously varying input may be employed to vary the impedance of the transistor and hence the current in the load. A load 29, Fig. 1, and power source 28 is arranged between the P-type regions 11 and 15, the centre N-type region 13 being biased negatively over resistor 26. The current i ec flowing in the load 29 is determined by the base current i b , Fig. 1a. Current iec flow is interrupted by a positive pulse 40 applied to the centre region 13. When the characteristic 30, 31 is asymmetrical, two transistors may be parallelled, Fig. 2 (not shown), with their directions of greater conductivity reversed. By the use of negative switching pulses and positive biasing, the circuit may be arranged to be normally non-conducting. In a modification, Fig. 3, current i from capacitor 129 is fed through inductor 131 and increases steadily, Fig. 4, until a positive pulse 140 applied to the central base region causes the transistor to cut off. By choosing the pulse width equal to a half-cycle of oscillation of inductor 131 and capacitor 133 the current reverses and at the termination of the pulse is fed back to the capacitor 129 to complete one cycle of the sawtooth. A smaller synchronizing pulse may be employed if the resistor 135 is returned to a negative source.
GB23859/53A 1952-09-09 1953-08-28 Control circuit including a semiconducting body Expired GB742134A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US308618A US2728857A (en) 1952-09-09 1952-09-09 Electronic switching
US742336XA 1952-10-01 1952-10-01

Publications (1)

Publication Number Publication Date
GB742134A true GB742134A (en) 1955-12-21

Family

ID=26755401

Family Applications (2)

Application Number Title Priority Date Filing Date
GB23859/53A Expired GB742134A (en) 1952-09-09 1953-08-28 Control circuit including a semiconducting body
GB25481/53A Expired GB742336A (en) 1952-09-09 1953-09-15 D.c. restoring or clamping circuits

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB25481/53A Expired GB742336A (en) 1952-09-09 1953-09-15 D.c. restoring or clamping circuits

Country Status (6)

Country Link
BE (2) BE522540A (en)
CH (2) CH326329A (en)
DE (2) DE1025011B (en)
FR (2) FR1084457A (en)
GB (2) GB742134A (en)
NL (2) NL181718B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL255567A (en) *
DE109417C (en) * 1958-06-18
US3001014A (en) * 1958-07-14 1961-09-19 Zenith Radio Corp Synchronizing-signal separator
DE1121115B (en) * 1958-11-13 1962-01-04 Telefunken Patent Bipolar electronic switch
DE1208791B (en) * 1962-08-31 1966-01-13 Robotron Corp Switching arrangement with two controlled semiconductor rectifiers
US3268658A (en) * 1963-04-19 1966-08-23 Rca Corp Transistor clamp circuit
DE1227938B (en) * 1964-07-17 1966-11-03 Siemens Ag Circuit arrangement for compensating the residual open circuit voltage in a transistor switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL156301B (en) * 1949-09-30 H Verheij S Machines Nv BREAD MAKING MACHINE.
US2594449A (en) * 1950-12-30 1952-04-29 Bell Telephone Labor Inc Transistor switching device

Also Published As

Publication number Publication date
DE1025011B (en) 1958-02-27
CH342603A (en) 1959-11-30
NL181718B (en)
NL181210C (en)
GB742336A (en) 1955-12-21
BE523133A (en)
FR1084457A (en) 1955-01-19
CH326329A (en) 1957-12-15
FR64684E (en) 1955-12-01
BE522540A (en)
DE1067473B (en) 1959-10-22

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