GB1249041A - Improvements in or relating to circuits for flash discharge tubes - Google Patents

Improvements in or relating to circuits for flash discharge tubes

Info

Publication number
GB1249041A
GB1249041A GB217469A GB217469A GB1249041A GB 1249041 A GB1249041 A GB 1249041A GB 217469 A GB217469 A GB 217469A GB 217469 A GB217469 A GB 217469A GB 1249041 A GB1249041 A GB 1249041A
Authority
GB
United Kingdom
Prior art keywords
lamp
capacitor
voltage
transistor
glow
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
GB217469A
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 Electronics UK Ltd
Original Assignee
Philips Electronic and Associated 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 Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1249041A publication Critical patent/GB1249041A/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
    • H02M3/22—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
    • H02M3/3385—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 with automatic control of output voltage or current
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
    • H05B41/32—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation

Abstract

1,249,041. Flash discharge tube circuits. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 14 Jan., 1969 [17 Jan., 1968], No. 2174/69. Heading H2H. [Also in Division G3] A circuit for supplying a flash tube includes a capacitor which is charged from an oscillator and maintained at a substantially constant voltage by an arrangement including a breakdown element and a semi-conductor switching device. In the circuit of Fig. 1, the capacitor 10 is charged from a D.C. source 2 by way of an oscillator including transistors 7, 8. When the voltage on the capacitor reaches a predetermined value, a glow-lamp 17 breaks down and terminates the operation of the oscillator. A transistor 16 also becomes conductive at this time, shorting a resistor 14. The capacitor slowly discharges until the lamp 17 extinguishes, when charging recommences. The ratio of maximum to minimum voltages on the capacitor is close to unity due to the shorting of the resistor 14 even though the lamp 17 remains conductive at a voltage appreciably lower than its strike voltage. A switch 25, which may be on a camera, discharges the capacitor through a triggered flash tube 1. In an alternative arrangement, Fig. 2 (not shown), a normally conducting transistor is connected in series with the glow-lamp. When the lamp strikes, the transistor is blocked and a further resistance is placed in series with the lamp to lower its voltage and advance its extinction in the same way as in the first embodiment. The glow-lamp may be replaced by a diac, and the transistor 16 could alternatively be a thyristor or triac.
GB217469A 1968-01-17 1969-01-14 Improvements in or relating to circuits for flash discharge tubes Expired GB1249041A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6800696A NL161031C (en) 1968-01-17 1968-01-17 DEVICE FOR IGNITING AND FEEDING A DISCHARGE FLASHLIGHT.

Publications (1)

Publication Number Publication Date
GB1249041A true GB1249041A (en) 1971-10-06

Family

ID=19802526

Family Applications (1)

Application Number Title Priority Date Filing Date
GB217469A Expired GB1249041A (en) 1968-01-17 1969-01-14 Improvements in or relating to circuits for flash discharge tubes

Country Status (8)

Country Link
JP (1) JPS4719385B1 (en)
AT (1) AT291755B (en)
BE (1) BE726944A (en)
DE (1) DE1901584B2 (en)
ES (1) ES362528A1 (en)
FR (1) FR1600339A (en)
GB (1) GB1249041A (en)
NL (1) NL161031C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2900608A1 (en) * 1978-01-17 1979-07-19 Fuji Koeki Corp POWER SUPPLY DEVICE
DE2809617A1 (en) * 1978-03-06 1979-09-13 Balda Werke Photographische ELECTRONIC FLASH DEVICE
US4530550A (en) * 1982-09-13 1985-07-23 Olympus Optical Company Ltd. Power supply unit for electronic flash
DE3420033A1 (en) * 1984-05-29 1985-12-05 Richard Hirschmann Radiotechnisches Werk, 7300 Esslingen Self-excited DC/DC voltage converter having voltage regulation

Also Published As

Publication number Publication date
DE1901584A1 (en) 1969-07-31
ES362528A1 (en) 1970-09-01
JPS4719385B1 (en) 1972-06-02
DE1901584B2 (en) 1975-10-16
BE726944A (en) 1969-07-15
AT291755B (en) 1971-07-26
NL6800696A (en) 1969-07-21
NL161031C (en) 1979-12-17
FR1600339A (en) 1970-07-20

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