GB606004A - Improvements in push-pull amplifying circuits - Google Patents

Improvements in push-pull amplifying circuits

Info

Publication number
GB606004A
GB606004A GB6244/46A GB624446A GB606004A GB 606004 A GB606004 A GB 606004A GB 6244/46 A GB6244/46 A GB 6244/46A GB 624446 A GB624446 A GB 624446A GB 606004 A GB606004 A GB 606004A
Authority
GB
United Kingdom
Prior art keywords
transformer
opposition
bias
supplied
negative bias
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
GB6244/46A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB606004A publication Critical patent/GB606004A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/22Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with tubes only
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10Regulating voltage or current
    • G05F1/46Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/52Regulating voltage or current wherein the variable actually regulated by the final control device is dc using discharge tubes in series with the load as final control devices
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26Push-pull amplifiers; Phase-splitters therefor
    • H03F3/28Push-pull amplifiers; Phase-splitters therefor with tubes only
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/04Synchronising
    • H04N5/08Separation of synchronising signals from picture signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Amplifiers (AREA)

Abstract

606,004. Valve - amplifying circuits. PHILIPS LAMPS, Ltd. Feb. 28, 1946, No. 6244. Convention date, July 4, 1941. [Class 40 (vi)] In a class B or class C push-pull amplifier circuit, a variable grid bias increasing with the input to the amplifier is obtained by rectifying the alternating current voltage appearing in the H.T. supply unit to decrease the distortion caused by the voltage drop due to the resistance of this unit. The Figure shows a low-frequency push-pull amplifier comprising valves 5 and 6, the anode voltage being supplied from transformer 9 and rectifying valve 10. A fixed negative bias for valves 5, 6, is derived from transformer 15 and rectifying valve 16. A variable grid bias in opposition to the fixed negative bias is supplied by means of transformer 18, the primary of which is connected between the two secondary windings of transformer 9, and the secondary winding is connected in series opposition with the secondary windings of transformer 15. The opposition voltage supplied by transformer 18 increases as the signal increases, thereby decreasing the negative bias voltage supplied from rectifier 16. Transformer 18 should have a low primary resistance and high transformation ratio, and phase-shifting networks 26, 27, are provided to ensure that the two voltages are exactly in phase opposition. The bias is applied via potentiometers 28 and 29, which should be of high resistance. To prevent overloading of valves 5 and 6, transformer 18 may be arranged to become saturated at the maximum admissible load so that the negative bias is not reduced beyond this point.
GB6244/46A 1941-07-04 1946-02-28 Improvements in push-pull amplifying circuits Expired GB606004A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL606004X 1941-07-04

Publications (1)

Publication Number Publication Date
GB606004A true GB606004A (en) 1948-08-04

Family

ID=19787944

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6244/46A Expired GB606004A (en) 1941-07-04 1946-02-28 Improvements in push-pull amplifying circuits

Country Status (5)

Country Link
US (1) US2527406A (en)
DE (1) DE860081C (en)
FR (1) FR883747A (en)
GB (1) GB606004A (en)
NL (1) NL59009C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2772329A (en) * 1951-02-23 1956-11-27 Bendix Aviat Corp Correction of distortion in push-pull amplifiers
US2896096A (en) * 1953-03-17 1959-07-21 Schwarzer Fritz Power supply
US3064202A (en) * 1959-01-27 1962-11-13 Gen Electric Low current drain transistor amplifier
US3274508A (en) * 1963-10-14 1966-09-20 Webster Electric Co Inc Power amplifier including biasing means for reducing standby power dissipation

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1904272A (en) * 1928-03-07 1933-04-18 Bell Telephone Labor Inc Vacuum tube amplifier circuit
US1985946A (en) * 1929-01-25 1935-01-01 Rca Corp Amplifying and reproducing system
US2102779A (en) * 1934-02-28 1937-12-21 Rca Corp Thermionic amplifier
US2154200A (en) * 1934-11-12 1939-04-11 Rca Corp Voltage regulator device
US2132830A (en) * 1934-11-20 1938-10-11 Dictaphone Corp Audio frequency amplifier

Also Published As

Publication number Publication date
FR883747A (en) 1943-07-13
US2527406A (en) 1950-10-24
NL59009C (en)
DE860081C (en) 1952-12-18

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