CA2031809A1 - Method for controlling fluorescent lamp dimmers and circuit for providing such control - Google Patents
Method for controlling fluorescent lamp dimmers and circuit for providing such controlInfo
- Publication number
- CA2031809A1 CA2031809A1 CA002031809A CA2031809A CA2031809A1 CA 2031809 A1 CA2031809 A1 CA 2031809A1 CA 002031809 A CA002031809 A CA 002031809A CA 2031809 A CA2031809 A CA 2031809A CA 2031809 A1 CA2031809 A1 CA 2031809A1
- Authority
- CA
- Canada
- Prior art keywords
- amount
- light
- control circuit
- steep slope
- slope
- 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.)
- Abandoned
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
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
-
- 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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
- H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
- H05B41/3922—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations and measurement of the incident 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S315/00—Electric lamp and discharge devices: systems
- Y10S315/07—Starting and control circuits for gas discharge lamp using transistors
Abstract
PHA 21.560 31-07-1990 ABSTRACT;
Method for controlling fluorescent lamp dimmers and circuit for providing such control.
A method of controlling fluorescent lamps in accordance with any selected one of a family of curves plotting sensed natural and artificial light against lamp output, each curve having a steep portion and a more moderate portion and a circuit for providing such control.
Method for controlling fluorescent lamp dimmers and circuit for providing such control.
A method of controlling fluorescent lamps in accordance with any selected one of a family of curves plotting sensed natural and artificial light against lamp output, each curve having a steep portion and a more moderate portion and a circuit for providing such control.
Description
2031~09 P~A 21.560 1 31-07-1990 ., Method for controlling fluorescent lamp dimmers and circuit for providing such control.
~his is an invention in the lighting art. More particularly, it involves a method for controlling fluorescent lamp dimmers. It also involves a control circuit for providing such a method.
This invention is related to that disclosed in Application Serial No. 403,222 of Stefan F. Szuba filed September 5, 1989 under the title "Dimmer Control Circuit"
and assigned to the same assignee as this application.
Application Serial No. 403,222 incorporates by reference U.S. Patent Application Serial No. 358,257 of John M. Wong and Michael Ao Kurzak filed on May 26, 1989 and all matter incorporated by reference therein. Application Serial No. 403,222 and all matter incorporated by reference therein is hereby incorporated by re~erence herein.
It is an object of this invention to provide a more efficient dimming controller for fluorescent lamps.
One of the advantages o~ the invention is that it provides higher electrical energy ~avings than prior dimming controllers.
One of the features of the invention is that it enables one to control the amount of light at a prescribed location more selectively than in the past.
In accordance with one aspect of the invention, there is provided a method for controlling the amount of light provided by fluorescent lamps at a prescribed location.
The control is in accordance with any selected one of a family of predetermined curves. Each of the curves plots the amount of lamp light versus the amount of illumination provided by natural light and lamp light. Each of the curves has a portion with a steep slope joined with a portion with a more moderate slope than the steep slope. The method includes sensing the amount of illumination provided at the prescribed location by natural light and by artificial light. It also 2~31809 PHA 21.560 2 31-07-1990 includes selecting one of the family of curves. The fluorescent lamps are controlled to provide a large amount of light in accordance with the steep 610pe of the selected curve when the amount of sens~d illumination is at a low degree. The lamps are further controlled to provide a lower amount of light than the large amount in accordance with the more moderate portion of the selected curve when the amount of sensed illumination i5 at a degree higher than the low degree.
In accordance with another aspect of the invention, there is provided a control circuit for a fluorescent lamp dimmer. The control circuit i8 connected to a ballast for fluorescent lamps. The control circuit operates to control the amount of light provided by the fluorescent lamps at a prescribed location in acc~rdance with any selected one of a family of predetermined curves. Each of the curves plots the amount of light provided by the fluorescent lamps versus the amount of illumination provided by natural light and by the fluorescent lamps at the prescribed location. The circuit includes light sensing means for sensing the amount of illumination at the prescribed location. It also includes selection means for selecting one of the family of curves.
Each of the curves has a steep slope when the light sensing means indicates that the fluorescent lamps should provide a high amount of light and a more moderate ~lope when the light sensing means indicates the fluorescent lamps should provide a lesser amount than the high amount. The control circuit also includes determining means for determining at what amount of light from the fluorescent lamps each of the curves transposes from the sharp slope to the more moderate slope.
Other objects, features and advantages of the invention will be apparent from the following description and appended claims when considered in conjunction with the accompanying drawing in which, Figure 1 is a dimmer control circuit provided in accordance with this invention: and Figure 2 is a family of curves by which the method of this invention may be practiced.
2031~V9 PHA 21.560 3 31-07-1990 A representation of the control circuit of the invention is shown in Figure 1 of the drawing wherein the control circuit is connected to terminals 113 and 114 of dimming interface 110 of Figure ~ of Application Serial No. 358,257. As can be seen in Figure 1 hereof, there is provided a light sensor LS which senses light at a particular location. Light sensor LS is ~onnected across capacitor C, one end of which is connected to the base of NPN transistor Q3. The other end of capacitor C is connected to the collector of transistor Q3.
The emitter of transistor Q3 is connected to one end of rheostat Rh, the other end of which i5 connected to one end of light sensor LS and to the base of transistor ~3.
The emitter of transistor Q3 is also connected to the base of NPN transistor Q2 and to the emitter of NPN transistor Q4.
The bases of transistor Q3 and Q4 are interconnected. The collector of transistor Q4 is connected to one end of resistor R2b, the other end of which is connected to the other end of capacitor C. The emitter of transistor Q4 is also connected to one end of resistor R2C~ the other end of which is connected to terminal 114.
Connected across the emitter and collector of transistor Q4 is resistor R2d. The collector of transistor Q2 is connected to one end of resistor R2a, the other end of which is connected to the other end of capacitor C. The one end of resistor R2a is also connected to the base of PNP
transistor Q1 The other end of resistor R2a is connected to the emitter of transistor Ql~ The emitter of transistor Q1 is also connected to terminal 113. The collector of transistor Ql is connected to terminal 114.
The family of curves shown in Figure 2 are the result of experimentation at work places. Only two curves of the family are shown. Those skilled in the art will understand from the disclosure herein that many more curves belong to the family. Each curve of Figure 2 represents the output of fluorescent lamps controlled in accordance with the invention versus the illumination at the light sensor. The upper steep slope portion of each curve, that is, the portion ~J f~l 3 ~
PHA 21.560 4 31-07-1990 ~rom A to B provides lumen maintenance control and ambient light regulation. the lower part with the more moderate slope, that is, portions B to C of each curve performs ambient light regulation only. It is to be understood that 5 curves of thi6 nature have been selected to provide optimum electrical energy use and optimum quality of lighting. The B
points of each curve have been chosen to represent 70% of the maximum of the lamps' output, which maximum is represented as the A point of each curve. Moreover, the slope of the curve was chosen such that the illuminance at the sensor at each B
point of each curve is equal to 1.105 times the illuminance at the A point of each curve.
Thus, with Al being located at 70 lux the control circuit is designed such that point Bl is located at 77.35 lux. In theory it was thought that poi,.t Cl could be located at 3.2 times the 70 lux value of Al. In practice, however, it was learned that variations in control circuit parameters between one control circuit and another and the variations in the mounting positions of the light sensor as well as variations in the workplace, made it more desirable to locate point Cl on the A1, Bl, Cl curve at 300 lux.
With A2 being located at 120 lux the control circuit is designed such that point B2 is located at 132~6 lux. Again as with the Al, Bl, Cl curve, it was thought that point C2 could be located at 3.2 times the 120 lux value of A2. In practice, however, it was again learned that variations in control circuit paramPters between one control circuit and another and the variations in the mounting positions of the light sensor as well as variations in the workplace, made it more desirable to locate point C2 on the A2, B2, C2 curve at 420 lux.
In operation, transistorS Ql~ Q2~ Q3 and Q4 are provided power for operation from the dimming interfac~
circuit 110 of Figure 1 of Application Serial No. 358,257 associated with the fluorescent lamp or lamps connected to ballast 31. No auxiliary power supply is reguired with the circuitry of Figure 1. Rheostat Rh acts as a threshold control or selection means. ~ransistor Ql is the main current ~ ~sJ~
PHA 21.560 5 31-97-1990 sink of the invention. Transistor Q2 operates as a regulation amplifier and as a partial current sink. Transistors Q3 and Q4 form a variable gain photo current amplifier. Transistors Q3 and Q4 work in such a way that at low natural light levels they have a high current gain. At this high gain the upper portion A to B of each curve i8 provided by the fluorescent lamp or lamps being controlled. At higher natural light levels transistor Q4 saturates and this results in a relatively low current gain of the amplifier formed by transistors Q3 and Q4. This provides the more moderate portion of each curve from point B to point C. The value of resistor R2b and the current gain of transistors Q3 and Q4 are what determine the location B on each nf the curves of ~igure 2.
Resistors R2b and R2d are selected to obtain the desired steep slope of each curve between its A point and its B point. R~a serves to establish a bias for transistor Ql R2C serves to establish initial voltage gain for the circuit.
It should be apparent that various modifications of the above will be evident to those skilled in the art and the arrangement described herein is for illustrative purposes and is not to be considered restrictive.
~his is an invention in the lighting art. More particularly, it involves a method for controlling fluorescent lamp dimmers. It also involves a control circuit for providing such a method.
This invention is related to that disclosed in Application Serial No. 403,222 of Stefan F. Szuba filed September 5, 1989 under the title "Dimmer Control Circuit"
and assigned to the same assignee as this application.
Application Serial No. 403,222 incorporates by reference U.S. Patent Application Serial No. 358,257 of John M. Wong and Michael Ao Kurzak filed on May 26, 1989 and all matter incorporated by reference therein. Application Serial No. 403,222 and all matter incorporated by reference therein is hereby incorporated by re~erence herein.
It is an object of this invention to provide a more efficient dimming controller for fluorescent lamps.
One of the advantages o~ the invention is that it provides higher electrical energy ~avings than prior dimming controllers.
One of the features of the invention is that it enables one to control the amount of light at a prescribed location more selectively than in the past.
In accordance with one aspect of the invention, there is provided a method for controlling the amount of light provided by fluorescent lamps at a prescribed location.
The control is in accordance with any selected one of a family of predetermined curves. Each of the curves plots the amount of lamp light versus the amount of illumination provided by natural light and lamp light. Each of the curves has a portion with a steep slope joined with a portion with a more moderate slope than the steep slope. The method includes sensing the amount of illumination provided at the prescribed location by natural light and by artificial light. It also 2~31809 PHA 21.560 2 31-07-1990 includes selecting one of the family of curves. The fluorescent lamps are controlled to provide a large amount of light in accordance with the steep 610pe of the selected curve when the amount of sens~d illumination is at a low degree. The lamps are further controlled to provide a lower amount of light than the large amount in accordance with the more moderate portion of the selected curve when the amount of sensed illumination i5 at a degree higher than the low degree.
In accordance with another aspect of the invention, there is provided a control circuit for a fluorescent lamp dimmer. The control circuit i8 connected to a ballast for fluorescent lamps. The control circuit operates to control the amount of light provided by the fluorescent lamps at a prescribed location in acc~rdance with any selected one of a family of predetermined curves. Each of the curves plots the amount of light provided by the fluorescent lamps versus the amount of illumination provided by natural light and by the fluorescent lamps at the prescribed location. The circuit includes light sensing means for sensing the amount of illumination at the prescribed location. It also includes selection means for selecting one of the family of curves.
Each of the curves has a steep slope when the light sensing means indicates that the fluorescent lamps should provide a high amount of light and a more moderate ~lope when the light sensing means indicates the fluorescent lamps should provide a lesser amount than the high amount. The control circuit also includes determining means for determining at what amount of light from the fluorescent lamps each of the curves transposes from the sharp slope to the more moderate slope.
Other objects, features and advantages of the invention will be apparent from the following description and appended claims when considered in conjunction with the accompanying drawing in which, Figure 1 is a dimmer control circuit provided in accordance with this invention: and Figure 2 is a family of curves by which the method of this invention may be practiced.
2031~V9 PHA 21.560 3 31-07-1990 A representation of the control circuit of the invention is shown in Figure 1 of the drawing wherein the control circuit is connected to terminals 113 and 114 of dimming interface 110 of Figure ~ of Application Serial No. 358,257. As can be seen in Figure 1 hereof, there is provided a light sensor LS which senses light at a particular location. Light sensor LS is ~onnected across capacitor C, one end of which is connected to the base of NPN transistor Q3. The other end of capacitor C is connected to the collector of transistor Q3.
The emitter of transistor Q3 is connected to one end of rheostat Rh, the other end of which i5 connected to one end of light sensor LS and to the base of transistor ~3.
The emitter of transistor Q3 is also connected to the base of NPN transistor Q2 and to the emitter of NPN transistor Q4.
The bases of transistor Q3 and Q4 are interconnected. The collector of transistor Q4 is connected to one end of resistor R2b, the other end of which is connected to the other end of capacitor C. The emitter of transistor Q4 is also connected to one end of resistor R2C~ the other end of which is connected to terminal 114.
Connected across the emitter and collector of transistor Q4 is resistor R2d. The collector of transistor Q2 is connected to one end of resistor R2a, the other end of which is connected to the other end of capacitor C. The one end of resistor R2a is also connected to the base of PNP
transistor Q1 The other end of resistor R2a is connected to the emitter of transistor Ql~ The emitter of transistor Q1 is also connected to terminal 113. The collector of transistor Ql is connected to terminal 114.
The family of curves shown in Figure 2 are the result of experimentation at work places. Only two curves of the family are shown. Those skilled in the art will understand from the disclosure herein that many more curves belong to the family. Each curve of Figure 2 represents the output of fluorescent lamps controlled in accordance with the invention versus the illumination at the light sensor. The upper steep slope portion of each curve, that is, the portion ~J f~l 3 ~
PHA 21.560 4 31-07-1990 ~rom A to B provides lumen maintenance control and ambient light regulation. the lower part with the more moderate slope, that is, portions B to C of each curve performs ambient light regulation only. It is to be understood that 5 curves of thi6 nature have been selected to provide optimum electrical energy use and optimum quality of lighting. The B
points of each curve have been chosen to represent 70% of the maximum of the lamps' output, which maximum is represented as the A point of each curve. Moreover, the slope of the curve was chosen such that the illuminance at the sensor at each B
point of each curve is equal to 1.105 times the illuminance at the A point of each curve.
Thus, with Al being located at 70 lux the control circuit is designed such that point Bl is located at 77.35 lux. In theory it was thought that poi,.t Cl could be located at 3.2 times the 70 lux value of Al. In practice, however, it was learned that variations in control circuit parameters between one control circuit and another and the variations in the mounting positions of the light sensor as well as variations in the workplace, made it more desirable to locate point Cl on the A1, Bl, Cl curve at 300 lux.
With A2 being located at 120 lux the control circuit is designed such that point B2 is located at 132~6 lux. Again as with the Al, Bl, Cl curve, it was thought that point C2 could be located at 3.2 times the 120 lux value of A2. In practice, however, it was again learned that variations in control circuit paramPters between one control circuit and another and the variations in the mounting positions of the light sensor as well as variations in the workplace, made it more desirable to locate point C2 on the A2, B2, C2 curve at 420 lux.
In operation, transistorS Ql~ Q2~ Q3 and Q4 are provided power for operation from the dimming interfac~
circuit 110 of Figure 1 of Application Serial No. 358,257 associated with the fluorescent lamp or lamps connected to ballast 31. No auxiliary power supply is reguired with the circuitry of Figure 1. Rheostat Rh acts as a threshold control or selection means. ~ransistor Ql is the main current ~ ~sJ~
PHA 21.560 5 31-97-1990 sink of the invention. Transistor Q2 operates as a regulation amplifier and as a partial current sink. Transistors Q3 and Q4 form a variable gain photo current amplifier. Transistors Q3 and Q4 work in such a way that at low natural light levels they have a high current gain. At this high gain the upper portion A to B of each curve i8 provided by the fluorescent lamp or lamps being controlled. At higher natural light levels transistor Q4 saturates and this results in a relatively low current gain of the amplifier formed by transistors Q3 and Q4. This provides the more moderate portion of each curve from point B to point C. The value of resistor R2b and the current gain of transistors Q3 and Q4 are what determine the location B on each nf the curves of ~igure 2.
Resistors R2b and R2d are selected to obtain the desired steep slope of each curve between its A point and its B point. R~a serves to establish a bias for transistor Ql R2C serves to establish initial voltage gain for the circuit.
It should be apparent that various modifications of the above will be evident to those skilled in the art and the arrangement described herein is for illustrative purposes and is not to be considered restrictive.
Claims (15)
1. A method of controlling the amount of light provided by fluorescent lamps at a prescribed location in accordance with any selected one of a family of predetermined curves, each of said curves having a portion with a steep slope joined to a portion with a more moderate slope than said steep slope, said method including sensing the amount of illumination provided at the prescribed location by natural light and by said fluorescent lamps, selecting one of said family of curves, said fluorescent lamps being controlled to provide a large amount of light in accordance with the steep slope of said selected curve when the amount of sensed illumination is in a low range and being controlled to provide a lesser amount of light than said larger amount in accordance with said more moderate portion of said curve when the amount of sensed illumination is at a degree higher than said low range.
2. A method according to claim 1, wherein the amount of light sensed at the bottom of said steep lope is approximately 1.105 times the amount sensed at the top of said steep slope.
3. A method according to claim 1 or claim 2, wherein the amount of light provided by said fluorescent lamps at the bottom of said steep slope is approximately 70% of the amount provided at the top of said steep slope.
4. A method according to any one of claims 1, 2 or 3, wherein the amount of light sensed at the bottom of said more moderate slope is at least approximately 3.2 times that of the amount sensed at the top of said steep slope.
5. A method according to any one of claims 1, 2, 3 or 4. wherein the amount of light provided by said fluorescent lamps at the bottom of said more moderate slope is approximately 20% of the amount provided at the top of said steep slope.
6. A control circuit for a fluorescent lamp dimmer, PHA 21.560 31-07-1990 said control circuit being for connection to a ballast for fluorescent lamps, said control circuit operating to control the amount of light provided by said fluorescent lamps at a prescribed location in accordance with any selected one of a family of predetermined curves, said control circuit including light sensing means sensing the amount of illumination at the prescribed location provided by natural light and by said fluorescent lamps, selection means for selecting one of said family of curves, each of said curves having a steep slope when said light sensing means indicates said fluorescent lamps should provide a high amount of light and a more moderate slope when said light sensing means indicates said fluorescent lamps should provide a lesser amount than said high amount, said control circuit including determining means for determining at what amount of light from said fluorescent lamps each of said curves is transposed from said steep slope to said more moderate slope.
7. A control circuit for a fluorescent lamp dimmer according to claim 6, said control circuit including a photo amplifier comprising a pair of transistors which operate at a high current gain at low natural light levels.
8. A control circuit for a fluorescent lamp dimmer according to claim 7, wherein one of said pair of transistors saturates at a relatively high natural light level.
9. A control circuit for a fluorescent lamp dimmer according to claim 8, wherein said selection means includes a rheostat connected to the emitter of the other of said pair of transistors.
10. A control circuit for a fluorescent lamp dimmer according to claim 9, wherein said determination means includes a resistor connected to the collector of said one of said transistors.
11. A control circuit for a fluorescent lamp dimmer according to claim 10, wherein said determination means includes a resistor connected across the collector and emitter of said one of said pair of transistors.
12. A control circuit for a fluorescent lamp dimmer PHA 21.560 31-07-1990 according to claim 6, 7, 8, 9, 10 or 11, wherein said light sensor senses approximately 1.105 times the amount of light at the bottom of said steep slope than at the top of said steep slope.
13. A control circuit for a fluorescent light dimmer according to claim 6, 7, 8, 9, 10, 11 or 12, wherein said determination means operates so that approximately 70% of the amount of light provided at the top of said steep slope is provided at the bottom of said steep slope.
14. A control circuit for a fluorescent lamp dimmer according to claim 6, 7, 8, 9, 10, 11, 12 or 13, wherein said light sensing means at the bottom of said more moderate slope senses at least approximately 3.2 times the amount of light sensed at the top of said steep slope.
15. A control circuit for a fluorescent light dimmer according to claim 6, 7, 8, 9, 10, 11, 12, 13 or 14, wherein said determination means operates so that approximately 20%
of the amount of light provided at the top of said steep slope is provided at the bottom of said more moderate slope.
of the amount of light provided at the top of said steep slope is provided at the bottom of said more moderate slope.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/450,143 US5038079A (en) | 1989-12-11 | 1989-12-11 | Method for controlling fluorescent lamp dimmers and circuit for providing such control |
| US450,143 | 1989-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2031809A1 true CA2031809A1 (en) | 1991-06-12 |
Family
ID=23786939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002031809A Abandoned CA2031809A1 (en) | 1989-12-11 | 1990-12-07 | Method for controlling fluorescent lamp dimmers and circuit for providing such control |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US5038079A (en) |
| EP (1) | EP0432845B1 (en) |
| JP (1) | JPH03252099A (en) |
| KR (1) | KR100210714B1 (en) |
| CN (1) | CN1126434C (en) |
| AT (1) | ATE130158T1 (en) |
| CA (1) | CA2031809A1 (en) |
| DE (1) | DE69023463T2 (en) |
| ES (1) | ES2081344T3 (en) |
| FI (1) | FI98877C (en) |
| HK (1) | HK144396A (en) |
| HU (1) | HUT56217A (en) |
| MX (1) | MX168478B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5220250A (en) * | 1989-12-11 | 1993-06-15 | North American Philips Corp. | Fluorescent lamp lighting arrangement for "smart" buildings |
| CH683462A5 (en) * | 1992-04-02 | 1994-03-15 | Starkstrom Elektronik Ag | A circuit arrangement for generating an electric voltage command value in dependence on an electrical control voltage. |
| US5436532A (en) * | 1993-03-26 | 1995-07-25 | Rockwell International Corporation | Fluorescent lamp with improved efficiency |
| FI94204C (en) * | 1993-10-28 | 1995-07-25 | Helvar Oy | Control device for an electrical power consuming device |
| US7758234B1 (en) * | 2005-10-03 | 2010-07-20 | Pass & Seymour, Inc. | Electrical lighting device |
| US6969955B2 (en) | 2004-01-29 | 2005-11-29 | Axis Technologies, Inc. | Method and apparatus for dimming control of electronic ballasts |
| US20090224690A1 (en) * | 2008-03-05 | 2009-09-10 | Jian Xu | Economy mode for lighting control system |
| CN102752921B (en) * | 2012-06-21 | 2014-07-09 | 叶选锋 | Light-controlled switch |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3828220A (en) * | 1969-11-06 | 1974-08-06 | Secretary Environment Brit | Apparatus for controlling the intensity of vehicle headlamps |
| FR2174679B1 (en) * | 1972-03-07 | 1978-06-02 | Trouvin Guy | |
| US4135116A (en) * | 1978-01-16 | 1979-01-16 | The United States Of America As Represented By The Secretary Of The Navy | Constant illumination control system |
| US4236101A (en) * | 1978-08-18 | 1980-11-25 | Lutron Electronics Co., Inc. | Light control system |
| US4464606A (en) * | 1981-03-25 | 1984-08-07 | Armstrong World Industries, Inc. | Pulse width modulated dimming arrangement for fluorescent lamps |
| US4514727A (en) * | 1982-06-28 | 1985-04-30 | Trw Inc. | Automatic brightness control apparatus |
| JPS6090455U (en) * | 1983-11-28 | 1985-06-20 | シャープ株式会社 | Copy machine |
| US4658129A (en) * | 1985-07-25 | 1987-04-14 | Fan Jenn Kang | Photoelectric control device which detects changes in light intensity |
| US4874989A (en) * | 1986-12-11 | 1989-10-17 | Nilssen Ole K | Electronic ballast unit with integral light sensor and circuit |
| US4894527A (en) * | 1989-03-17 | 1990-01-16 | Burle Technologies, Inc. | Light dependent resistor digital control circuit |
-
1989
- 1989-12-11 US US07/450,143 patent/US5038079A/en not_active Expired - Lifetime
-
1990
- 1990-12-05 MX MX023590A patent/MX168478B/en unknown
- 1990-12-07 FI FI906041A patent/FI98877C/en not_active IP Right Cessation
- 1990-12-07 DE DE69023463T patent/DE69023463T2/en not_active Expired - Fee Related
- 1990-12-07 EP EP90203224A patent/EP0432845B1/en not_active Expired - Lifetime
- 1990-12-07 ES ES90203224T patent/ES2081344T3/en not_active Expired - Lifetime
- 1990-12-07 HU HU908131A patent/HUT56217A/en unknown
- 1990-12-07 AT AT90203224T patent/ATE130158T1/en not_active IP Right Cessation
- 1990-12-07 KR KR1019900020072A patent/KR100210714B1/en not_active IP Right Cessation
- 1990-12-07 CA CA002031809A patent/CA2031809A1/en not_active Abandoned
- 1990-12-08 CN CN90109962A patent/CN1126434C/en not_active Expired - Fee Related
- 1990-12-10 JP JP2407220A patent/JPH03252099A/en not_active Withdrawn
-
1996
- 1996-08-01 HK HK144396A patent/HK144396A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ES2081344T3 (en) | 1996-03-01 |
| HU908131D0 (en) | 1991-06-28 |
| CN1052983A (en) | 1991-07-10 |
| EP0432845A3 (en) | 1992-07-08 |
| KR910014006A (en) | 1991-08-08 |
| DE69023463D1 (en) | 1995-12-14 |
| FI98877C (en) | 1997-08-25 |
| MX168478B (en) | 1993-05-26 |
| US5038079A (en) | 1991-08-06 |
| HK144396A (en) | 1996-08-09 |
| HUT56217A (en) | 1991-07-29 |
| FI906041A0 (en) | 1990-12-07 |
| EP0432845A2 (en) | 1991-06-19 |
| JPH03252099A (en) | 1991-11-11 |
| FI906041A (en) | 1991-06-12 |
| CN1126434C (en) | 2003-10-29 |
| ATE130158T1 (en) | 1995-11-15 |
| EP0432845B1 (en) | 1995-11-08 |
| KR100210714B1 (en) | 1999-07-15 |
| DE69023463T2 (en) | 1996-06-05 |
| FI98877B (en) | 1997-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0510751B1 (en) | A fluorescent lamp lighting arrangement for "Smart" buildings | |
| CA2024440C (en) | Dimmer control circuit | |
| US10805994B2 (en) | Method and apparatus for determining a target light intensity from a phase-control signal | |
| CA1175948A (en) | Feedback control system for applying ac power to ballasted lamps | |
| US9226377B2 (en) | Circuit for reducing flicker in a lighting load | |
| US4482844A (en) | Lamp dimmer | |
| US20020175639A1 (en) | Closed loop lighting control system | |
| US20060043901A1 (en) | Lighting control circuit for vehicle lighting equipment | |
| JPH11509966A (en) | Dimmable ballast | |
| CA2031809A1 (en) | Method for controlling fluorescent lamp dimmers and circuit for providing such control | |
| US5459373A (en) | Mini-fluorescent lamp with automatic on/off | |
| EP0453030B1 (en) | Fluorescent lamp controlling arrangement | |
| JPH04269495A (en) | Lighting device | |
| GB2309516A (en) | Lamp control circuit with selectable brightness level | |
| CN1376017A (en) | Lamp controller and control method of lamp control circuit | |
| KR880003057Y1 (en) | Microelectric lightening device of vehicles | |
| KR890000060B1 (en) | Automatic dimmer circuit of fluorescent lamp | |
| JPS5834720Y2 (en) | automatic flashing device | |
| JPS59720Y2 (en) | Discharge lamp automatic dimmer device | |
| WO2004079906A2 (en) | Variable frequency half bridge driver | |
| SU1751731A1 (en) | Photoautomatic device for lighting equipment | |
| JPH10307557A (en) | Power light emitting diode driving circuit also used as battery indicator | |
| KR920004450Y1 (en) | Automatic lighting control circuit | |
| FI71859B (en) | ELECTRONIC CONTROLS FOR GLOEDLAMPS BELASTNING | |
| JPH0545990U (en) | Dimmer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |