GB850343A - Improvements in or relating to high voltage supply sources - Google Patents

Improvements in or relating to high voltage supply sources

Info

Publication number
GB850343A
GB850343A GB2403957A GB2403957A GB850343A GB 850343 A GB850343 A GB 850343A GB 2403957 A GB2403957 A GB 2403957A GB 2403957 A GB2403957 A GB 2403957A GB 850343 A GB850343 A GB 850343A
Authority
GB
United Kingdom
Prior art keywords
transistor
voltage
oscillator
circuit
high voltage
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
GB2403957A
Inventor
Abdul Hameed Quraishi
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.)
Marconi Instruments Ltd
Original Assignee
Marconi Instruments 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 Marconi Instruments Ltd filed Critical Marconi Instruments Ltd
Priority to GB2403957A priority Critical patent/GB850343A/en
Publication of GB850343A publication Critical patent/GB850343A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/338—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
    • H02M3/3382—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement in a push-pull circuit arrangement
    • H02M3/3384—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement in a push-pull circuit arrangement of the parallel type

Abstract

850,343. Transistor oscillator circuits. MARCONI INSTRUMENTS Ltd. June 9, 1958 [July 30, 1957], No. 24039/57. Class 40(6). [Also in Groups XXXV and XXXVI] A high voltage for supplying a moisture meter is obtained from a voltage multiplier arrangement connected to a D.C. transistor converter comprising a battery E, an oscillating transistor TRI and a transformer T having a feed back winding C. To start the oscillations the base of TRI is given (temporarily or continuously) a negative bias. The voltage is stabilized by transistor TR2 which is normally biased off by battery F but passes a heavy current when voltage across winding B becomes excessive, so limiting further voltage rise For moisture measurement or control the high voltage is applied to the circuit shown in Fig. 2, the test specimen being inserted at T, P and meter A<SP>1</SP> being graduated in ohms or in moisture content. For automatic control of moisture content A<SP>1</SP> is replaced by a relay, an astable flip-flop circuit or the split field of a servo-motor. The current passing through the test specimen may be amplified by a transistor (Fig. 3, not shown). According to the Provisional Specification the oscillator arrangement can be a class C, a ringing choke or a transformer coupled oscillator with grounded emitter or grounded base. Two transistors in a push-pull circuit can be used or a separate transistor oscillator can be used to feed a single-ended or push-pull output stage. Transistor TR2 can be replaced by a diode and voltage stabilization can also be provided using a diode and a condenser in a saw-tooth oscillator circuit across one or more voltage multiplication stages.
GB2403957A 1957-07-30 1957-07-30 Improvements in or relating to high voltage supply sources Expired GB850343A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2403957A GB850343A (en) 1957-07-30 1957-07-30 Improvements in or relating to high voltage supply sources

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2403957A GB850343A (en) 1957-07-30 1957-07-30 Improvements in or relating to high voltage supply sources

Publications (1)

Publication Number Publication Date
GB850343A true GB850343A (en) 1960-10-05

Family

ID=10205410

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2403957A Expired GB850343A (en) 1957-07-30 1957-07-30 Improvements in or relating to high voltage supply sources

Country Status (1)

Country Link
GB (1) GB850343A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3412311A (en) * 1966-03-28 1968-11-19 Westinghouse Electric Corp Battery-operated power supply circuitry for providing long battery lifetime and close regulation of the output voltages
GB2138643A (en) * 1983-04-08 1984-10-24 Standard Telephones Cables Ltd DC-DC Converter
EP0952449A2 (en) * 1998-04-21 1999-10-27 Illinois Tool Works Inc. Resistance measuring meter with voltage multiplier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3412311A (en) * 1966-03-28 1968-11-19 Westinghouse Electric Corp Battery-operated power supply circuitry for providing long battery lifetime and close regulation of the output voltages
GB2138643A (en) * 1983-04-08 1984-10-24 Standard Telephones Cables Ltd DC-DC Converter
EP0952449A2 (en) * 1998-04-21 1999-10-27 Illinois Tool Works Inc. Resistance measuring meter with voltage multiplier
EP0952449A3 (en) * 1998-04-21 2004-06-16 Illinois Tool Works Inc. Resistance measuring meter with voltage multiplier

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