GB2298092A - Control circuit for lighting apparatus - Google Patents
Control circuit for lighting apparatus Download PDFInfo
- 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- Withdrawn
Links
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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.
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)
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)
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 |
-
1995
- 1995-02-18 GB GB9503216A patent/GB2298092A/en not_active Withdrawn
Patent Citations (7)
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)
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) |