GB987077A - Lamp control - Google Patents

Lamp control

Info

Publication number
GB987077A
GB987077A GB3229463A GB3229463A GB987077A GB 987077 A GB987077 A GB 987077A GB 3229463 A GB3229463 A GB 3229463A GB 3229463 A GB3229463 A GB 3229463A GB 987077 A GB987077 A GB 987077A
Authority
GB
United Kingdom
Prior art keywords
photoresistor
aug
transformer
rectifiers
lamps
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
GB3229463A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 DEST19649A external-priority patent/DE1202186B/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB987077A publication Critical patent/GB987077A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
    • H05B39/081—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by measuring the incident light
    • 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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
    • H05B39/083—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

987,077. Controlling lamps. STANDARD TELEPHONES & CABLES Ltd. Aug.15, 1963 [Aug. 23, 1962; Aug. 30, 1962], No. 32294/63. Heading G1A. Lamps LS whose brightness is to be controlled in dependence upon the surrounding luminous density Bu are supplied with voltage from the mains through silicon controlled rectifiers G1 and G2 and have connected in parallel a transformer U3 used to supply a comparison lamp LV which shines on a photoresistor RF2. The photoresistor RF2 is connected in a bridge circuit with a further photoresistor RF1 whose resistance is dependent upon the surrounding luminous density. When the surrounding luminous density Bu increases, the resistance of RF1 is reduced and the voltage applied to the base of a transistor Trs1 which forms part of a differential amplifier DV becomes more positive and this variation is amplified and caused to change the bias of a transistor Trs3 of a phase shift bridge PB in which the output hrs its phase shifted in relationship with that of a transformer U1 connected to the mains as a function of the modulation of the transistor Trs3. This phase shifted A.C. is applied to a trigger TR and when it reaches a predetermined threshold value it causes the trigger to transmit a pulse via the transformer U2 and rectifiers G3 and G4 to the rectifiers G1 and G2. Due to the increase in positive voltage applied to the base of Trsl the time of triggering of each rectifier G1 and G2 is advanced so that the lamps LS receive a current of higher r.m.s. value and thus become brighter. This also brightens the lamp LV and eventually the circuit is balanced. The circuit elements are chosen so that the sensitivity of the apparatus to changes in surrounding luminous intensity closely follows that of the human eye.
GB3229463A 1962-08-23 1963-08-15 Lamp control Expired GB987077A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEST019628 1962-08-23
DEST19649A DE1202186B (en) 1962-08-30 1962-08-30 Circuit arrangement for controlling the brightness of signal lamps

Publications (1)

Publication Number Publication Date
GB987077A true GB987077A (en) 1965-03-24

Family

ID=25994115

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3229463A Expired GB987077A (en) 1962-08-23 1963-08-15 Lamp control

Country Status (1)

Country Link
GB (1) GB987077A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5118992A (en) * 1990-04-17 1992-06-02 North American Philips Corporation Fluorescent lamp controlling arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5118992A (en) * 1990-04-17 1992-06-02 North American Philips Corporation Fluorescent lamp controlling arrangement

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