GB929786A - Improvements in or relating to circuit arrangements for supplying an impedance with current pulses - Google Patents

Improvements in or relating to circuit arrangements for supplying an impedance with current pulses

Info

Publication number
GB929786A
GB929786A GB33184/59A GB3318459A GB929786A GB 929786 A GB929786 A GB 929786A GB 33184/59 A GB33184/59 A GB 33184/59A GB 3318459 A GB3318459 A GB 3318459A GB 929786 A GB929786 A GB 929786A
Authority
GB
United Kingdom
Prior art keywords
transistor
impedance
current
diode
pulses
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
GB33184/59A
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 Electrical Industries Ltd
Original Assignee
Philips Electrical 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB929786A publication Critical patent/GB929786A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • 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
    • H03K17/64—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 having inductive loads

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)
  • Dc-Dc Converters (AREA)
  • Electronic Switches (AREA)

Abstract

929,786. Transistor switching circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. Sept. 30, 1959 [Oct. 3, 1958], No. 33184/59. Class 40 (6). In a transistor switching circuit in which pulses of current are fed through an impedance 3 connected in the emitter circuit of a transistor 1 in accordance with switching pulses applied to the base electrode of the transistor, the magnitude of the current flowing during these pulses is maintained constant, despite variations in the value of the impedance 3 by feeding back voltage variations appearing at the emitter of the transistor through a unitygain amplifier, such as emitterfollower 11, to one end of a resistor 22 whose other end is connected to the collector of the transistor, thereby to maintain the voltage across the resistor during current pulses, and hence the current through the resistor and through the impedance 3, constant. The impedance 3 comprises a plurality of seriesconnected cores of a magnetic store; the voltage developed upon the application of a pulse consequently depends upon the states to which the cores have been set. In the circuit shown a resistor 21 is provided to allow current to flow initially through the transistor on the application of a switching pulse from the transformer 9. Fig. 6 shows a modified form of circuit in which two cascaded emitter-follower stages are interposed between the diode 13 and the blocking capacitor 14. In this arrangement the initial flow of current is provided from a capacitor 32 through the diode 18; when transistor 11 commences conducting, however, the diode is reversely biased and the capacitor is able to recharge. The diode 13 prevents the application of negative pulses, developed across the impedance 3, to the base of the transistor 11 or 16, so that the reverse collector-base voltage is not exceeded. It is stated that the feed-back may be effected through a cathode follower constituted by a triode operable with a low value of anode voltage, thus reducing the current drain imposed by the amplifier upon the impedance 3 and removing the need for a diode 13. Specifications 765,326 and 806,559 are referred to.
GB33184/59A 1958-10-03 1959-09-30 Improvements in or relating to circuit arrangements for supplying an impedance with current pulses Expired GB929786A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL231959 1958-10-03

Publications (1)

Publication Number Publication Date
GB929786A true GB929786A (en) 1963-06-26

Family

ID=19751373

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33184/59A Expired GB929786A (en) 1958-10-03 1959-09-30 Improvements in or relating to circuit arrangements for supplying an impedance with current pulses

Country Status (6)

Country Link
US (1) US3142763A (en)
CH (1) CH393422A (en)
DE (1) DE1091610B (en)
FR (1) FR1236934A (en)
GB (1) GB929786A (en)
NL (1) NL103758C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250651A (en) * 1990-09-05 1992-06-10 Fuji Electric Co Ltd Transistor switching circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624418A (en) * 1969-12-17 1971-11-30 Control Data Corp Push-pull floating driver

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751549A (en) * 1954-01-04 1956-06-19 Bell Telephone Labor Inc Current supply apparatus
NL107621C (en) * 1955-05-31
US2912635A (en) * 1956-11-01 1959-11-10 Ford Motor Co Electrical regulator device for generators
US2832900A (en) * 1957-02-12 1958-04-29 Gerald M Ford Transient overvoltage and short circuit protective network
US2878440A (en) * 1957-03-28 1959-03-17 Navigation Computer Corp Regulated power supply
US2888633A (en) * 1958-05-09 1959-05-26 Collins Radio Co Voltage regulator with limited current drain

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250651A (en) * 1990-09-05 1992-06-10 Fuji Electric Co Ltd Transistor switching circuit
US5202619A (en) * 1990-09-05 1993-04-13 Fuji Electric Co., Ltd. Control circuit for a switching transistor
GB2250651B (en) * 1990-09-05 1994-10-12 Fuji Electric Co Ltd Transistor switching circuit

Also Published As

Publication number Publication date
CH393422A (en) 1965-06-15
US3142763A (en) 1964-07-28
NL103758C (en)
DE1091610B (en) 1960-10-27
FR1236934A (en) 1960-07-22

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