GB2298092A - Control circuit for lighting apparatus - Google Patents

Control circuit for lighting apparatus Download PDF

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Publication number
GB2298092A
GB2298092A GB9503216A GB9503216A GB2298092A GB 2298092 A GB2298092 A GB 2298092A GB 9503216 A GB9503216 A GB 9503216A GB 9503216 A GB9503216 A GB 9503216A GB 2298092 A GB2298092 A GB 2298092A
Authority
GB
United Kingdom
Prior art keywords
lighting apparatus
control circuit
circuitry
pir
control circuitry
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.)
Withdrawn
Application number
GB9503216A
Other versions
GB9503216D0 (en
Inventor
Michael Allcock
Resphpal Singh Sangha
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.)
FW Thorpe PLC
Original Assignee
FW Thorpe 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
Application filed by FW Thorpe PLC filed Critical FW Thorpe PLC
Priority to GB9503216A priority Critical patent/GB2298092A/en
Publication of GB9503216D0 publication Critical patent/GB9503216D0/en
Publication of GB2298092A publication Critical patent/GB2298092A/en
Withdrawn legal-status Critical Current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
    • 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
    • H05B47/115—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings
    • H05B47/13—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings by using passive infrared detectors
    • 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

  • Rectifiers (AREA)

Abstract

A control circuit for lighting apparatus includes PIR circuitry fed with a stabilised low voltage supply from a mains source via a series limiting resistor R1, a bridge rectifier D1-D4, and a plurality of Zener diodes D5-D7. The lighting apparatus may be switched from a low to a high level e.g. automatically when anyone is present and vice versa when persons are absent, e.g. in storerooms and washrooms.

Description

LIGHTING APPARATUS This invention relates to lighting apparatus and more particularly control circuitry for situations where the lighting is to be switched from low to high level e.g. automatically when anyone is present and vice versa when persons are absent. The invention may find use for example in store rooms, washrooms and similar situations in business premises or in public places. A low level of lighting is required for persons to enter and perhaps also when they leave the lit space, but higher level of lighting when they occupy the space.
The conventional solution is to provide PIR circuitry which, with commercially available components is essentially low voltage for example 10 volt supply.
The problem is that special circuitry has to be provided including a transformer in order to provide the low voltage supply for the PIR. The object of the invention is to provide improvements, in particular to avoid the need for a transformer and additionally to minimise on power used in the controlling circuitry.
According to the invention we provide a series limiting resistor, bridge rectifier, and a set of zener diodes providing a stabilised low voltage supply from, for example, a mains voltage source. This replaces a transformer, smoothing capacitor and other circuitry, to like effect but at substantially reduced cost.
The arrangement may be such as to provide two functions namely a 12 volt supply for a PIR and a 1-10 volt control for a regulating ballast for the lamps.
One embodiment of the invention is more particularly shown in the accompanying circuit diagrams. The mains input is limited by resistor 1 which may be of 20k value.
Approximately 140 volts ac (RMS) are developed across the resistor thus providing lOOvolt ac (RMS) drive to the bridge rectifier.
Rectified output is approximately 100Vdc. Two series zener diodes (75V, 4.7V) provide a further 79.7V drop to the filter stage. The voltage to the filter stage is clamped at 24Vdc such that small low power rated components can be used.
The remaining circuit is that of a standard discrete regulating circuit.
A 220us filtering capacitor is such as to offer adequate impedence to the rectified ac and smoothing of the rectified current.

Claims (3)

1. Control circuitry for lighting apparatus including PIR circuitry fed with a stabilised low voltage supply from a mains voltage source via a series limiting resistor, bridge rectifier, and a set of zener diodes.
2. Control circuitry as claimed in Claim 1 but arranged to provide a 12 volt supply for a PIR and a 1-10 volt control for regulating ballast for lamps.
3. Control circuitry for lighting apparatus substantially as described with reference to the accompanying drawing.
GB9503216A 1995-02-18 1995-02-18 Control circuit for lighting apparatus Withdrawn GB2298092A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9503216A GB2298092A (en) 1995-02-18 1995-02-18 Control circuit for lighting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9503216A GB2298092A (en) 1995-02-18 1995-02-18 Control circuit for lighting apparatus

Publications (2)

Publication Number Publication Date
GB9503216D0 GB9503216D0 (en) 1995-04-05
GB2298092A true GB2298092A (en) 1996-08-21

Family

ID=10769842

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9503216A Withdrawn GB2298092A (en) 1995-02-18 1995-02-18 Control circuit for lighting apparatus

Country Status (1)

Country Link
GB (1) GB2298092A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365231A (en) * 2000-06-27 2002-02-13 Paul Mans Method and apparatus for the control of lighting circuits

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1050192A (en) *
GB922490A (en) * 1960-02-22 1963-04-03 Electroflo Meters Co Ltd Improvements relating to apparatus for providing stabilised d.c. voltages
GB2094572A (en) * 1981-03-07 1982-09-15 Southall Geoffrey Richard Supply of power to intrinsically safe devices in hazardous areas
GB2175463A (en) * 1985-05-12 1986-11-26 Michael Shmuel Howard Ballasts and transformerless power supplies
US4682079A (en) * 1984-10-04 1987-07-21 Hallmark Cards, Inc. Light string ornament circuitry
GB2232021A (en) * 1989-03-02 1990-11-28 Hemscheidt Maschf Hermann An intrinsically safe power supply
GB2269008A (en) * 1992-07-15 1994-01-26 Applied Security Design Ltd A security device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1050192A (en) *
GB922490A (en) * 1960-02-22 1963-04-03 Electroflo Meters Co Ltd Improvements relating to apparatus for providing stabilised d.c. voltages
GB2094572A (en) * 1981-03-07 1982-09-15 Southall Geoffrey Richard Supply of power to intrinsically safe devices in hazardous areas
US4682079A (en) * 1984-10-04 1987-07-21 Hallmark Cards, Inc. Light string ornament circuitry
GB2175463A (en) * 1985-05-12 1986-11-26 Michael Shmuel Howard Ballasts and transformerless power supplies
GB2232021A (en) * 1989-03-02 1990-11-28 Hemscheidt Maschf Hermann An intrinsically safe power supply
GB2269008A (en) * 1992-07-15 1994-01-26 Applied Security Design Ltd A security device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365231A (en) * 2000-06-27 2002-02-13 Paul Mans Method and apparatus for the control of lighting circuits
GB2365231B (en) * 2000-06-27 2004-09-15 Paul Mans Method and apparatus for the control of lighting circuits

Also Published As

Publication number Publication date
GB9503216D0 (en) 1995-04-05

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)