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GB1333912A - Lighting control arrangements - Google Patents

Lighting control arrangements

Info

Publication number
GB1333912A
GB1333912A GB5128769A GB1333912DA GB1333912A GB 1333912 A GB1333912 A GB 1333912A GB 5128769 A GB5128769 A GB 5128769A GB 1333912D A GB1333912D A GB 1333912DA GB 1333912 A GB1333912 A GB 1333912A
Authority
GB
United Kingdom
Prior art keywords
output
lighting
threshold
saturation
switched
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
GB5128769A
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 Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Publication of GB1333912A publication Critical patent/GB1333912A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4204—Photometry, e.g. photographic exposure meter using electric radiation detectors with determination of ambient light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

1333912 Transistor bi-stable and timing circuits MULLARD Ltd 5 Nov 1970 [20 Oct 1969] 51287/69 Heading H3T [Also in Division G1] In a system which switches lighting on or off according to the ambient light level, a photodiode or phototransistor D1 provides an amplified output to devices Q4, Q5 having different threshold levels whose outputs are combined so that if both thresholds are exceeded the lighting is switched off, whereas if neither is attained the lighting is switched on. The response of the system in the MID region depends on whether the level was previously HIGH or LOW. This variable MID level response is provided by a backlash circuit (Fig. 3, not shown) including the operational amplifiers Q4, Q5, Q8. The output of Q8 is the basic output from the controller, which is modified by a timing circuit C4-R12 so that transient dull conditions, e.g. clouds passing across the sun, do not actuate the lighting system. The output from the photodiode D1 which may be employed in the photovoltaic mode, is amplified by the variable gain operational amplifier Q2 whose gain (RI adjustment) sets both the upper threshold on Q4 and the lower threshold on Q5. Below its threshold Q4 gives a negative saturation output, above the threshold positive saturation Q5 gives a positive saturation output below its threshold, negative saturation above. To perform a cloud recognition function, the output from the R12-C4 network is monitored by the FET Q9. With a high output from Q8, diode D2 conducts and capacitor C4 charges to line potential. Hence the amplifier Q10 has a positive saturation output, which energizes control relay RR to turn on the lighting. With a low output from Q8, diode D2 is cut off and capacitor C4 begins its discharge. After a preset time interval amplifier Q10 switches to negative saturation, and control relay RR switches off. if a high output from Q8 returns during the discharge period the timer is reset. ln this way, the lighting is not switched off until bright conditions have persisted for fifteen minutes. Pilot lamps B1-B5 monitor the output voltages of the various operational amplifiers and hence give a visual indication of the state of the circuit at any time.
GB5128769A 1969-10-20 1969-10-20 Lighting control arrangements Expired GB1333912A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5128769 1969-10-20

Publications (1)

Publication Number Publication Date
GB1333912A true GB1333912A (en) 1973-10-17

Family

ID=10459415

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5128769A Expired GB1333912A (en) 1969-10-20 1969-10-20 Lighting control arrangements

Country Status (1)

Country Link
GB (1) GB1333912A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135771A (en) * 1983-02-23 1984-09-05 Lutron Electronics Co Excess light turn-off circuit
GB2221298A (en) * 1988-07-18 1990-01-31 Egidio Basso Light-sensitive switch structure and method with inverse off/on ratio
GB2298043A (en) * 1995-02-18 1996-08-21 Thorpe F W Plc Lighting apparatus switched according to ambient light level

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135771A (en) * 1983-02-23 1984-09-05 Lutron Electronics Co Excess light turn-off circuit
GB2221298A (en) * 1988-07-18 1990-01-31 Egidio Basso Light-sensitive switch structure and method with inverse off/on ratio
GB2221298B (en) * 1988-07-18 1993-03-10 Egidio Basso Condition responsive switch structure and method with inverse off/on ratio
GB2298043A (en) * 1995-02-18 1996-08-21 Thorpe F W Plc Lighting apparatus switched according to ambient light level

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees