EP1976341B1 - Lighting module power-saving control method - Google Patents

Lighting module power-saving control method Download PDF

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Publication number
EP1976341B1
EP1976341B1 EP07006412A EP07006412A EP1976341B1 EP 1976341 B1 EP1976341 B1 EP 1976341B1 EP 07006412 A EP07006412 A EP 07006412A EP 07006412 A EP07006412 A EP 07006412A EP 1976341 B1 EP1976341 B1 EP 1976341B1
Authority
EP
European Patent Office
Prior art keywords
power
lighting module
current
time
saving
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.)
Active
Application number
EP07006412A
Other languages
German (de)
French (fr)
Other versions
EP1976341A1 (en
Inventor
Chao-Chin Yeh
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.)
Chuan Shih Industrial Co Ldt
Original Assignee
Chuan Shih Industrial Co Ldt
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 Chuan Shih Industrial Co Ldt filed Critical Chuan Shih Industrial Co Ldt
Priority to EP07006412A priority Critical patent/EP1976341B1/en
Priority to PL07006412T priority patent/PL1976341T3/en
Priority to ES07006412T priority patent/ES2317603T3/en
Priority to AT07006412T priority patent/ATE413795T1/en
Priority to DE602007000234T priority patent/DE602007000234D1/en
Publication of EP1976341A1 publication Critical patent/EP1976341A1/en
Application granted granted Critical
Publication of EP1976341B1 publication Critical patent/EP1976341B1/en
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    • 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
    • H05B39/041—Controlling the light-intensity of the source
    • H05B39/044—Controlling the light-intensity of the source continuously
    • H05B39/047—Controlling the light-intensity of the source continuously with pulse width modulation from a DC power source
    • 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
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation

Definitions

  • the present invention relates to lighting module control means and more particularly, to a lighting module power-saving control method.
  • a same power is consumed during lighting. For example, if a light emitting device is turned on with a watt consumption "w" and the length of turn-on period is "t", the light emitting device keeps consuming power supply at the watt consumption "w" within the whole length of turn-on period "t". If the length of the time period is divided into 1000 equal parts, the power consumption time of watt consumption "w" of the light emitting device is 1000/1000, as shown in FIG 1 . Under certain conditions, this power consumption manner is a waste. If the light emitting device is not used for a special processing work but for illumination, it is not necessary to keep consuming power supply at the watt consumption "w" within the whole length of turn-on period "t” because of the persistence of human vision.
  • US 2005/0212461 pertains to a projection type video display apparatus comprising inter alia input means for inputting a power saving mode setting command to fix the luminance of a light source to a predetermined power saving level, average luminance level detection means for detecting the average luminance level of an input video signal and PWM generation means.
  • the PWM generation means permits generation of a first PWM signal having a duty ratio corresponding to the average luminance level detected by the average luminance level detection means in a certain duty ratio range and of a second PWM signal with a duty ratio outside the predetermined duty ratio range when the power saving mode setting command is inputted.
  • the PWM signal is used for controlling the luminance of the light source on the basis of the duty ratio of the inputted PWM signal.
  • the present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a method of saving the power consumption of the lighting module of a lamp by means of the persistence of human vision.
  • the power-saving control method is used in a light emitting device having a power output loop and a lighting module to save power consumption.
  • the method comprises installing a switching control loop in said light emitting device for controlling said power output loop at each time-sharing cycle, said time-sharing cycle dividing the length of a unit time into multiple equal parts for said power output loop; alternately outputting a normal-consumption current by said power output loop to said lighting module within a first predetermined length of time and a power-saving current by said power output loop to said lighting module within a second predetermined length of time, characterized in that the frequency of the supply of said normal-consumption current is not less than 16 times/second and that the power-saving current is greater than or equal to the minimum exciting current of the lighting module.
  • FIG 2 is a circuit diagram of a lamp in accordance with a first embodiment of the present invention.
  • the lamp comprises a DC power loop 10, a switching control loop 11 connected to the DC power loop 10, a power output loop 12 connected to the switching control loop 11, and a lighting module 13 connected to the power output loop 12.
  • the lamp is a compact fluorescent lamp.
  • the switching control loop 11 provides a high-frequency current output signal and a low-frequency current output signal at a milli-second time division cycle. It divides the length of a unit time "t" into multiple equal parts in which signals are respectively outputted.
  • the power output loop 12 executes output of different currents subject to the control of the switching control loop 11, i.e., the power output loop 12 is controlled by the switching control loop 11 to output a normal-consumption current to the lighting module 13 within a predetermined length of time, and to output a power-saving current to the lighting module 13 within another predetermined length of time.
  • the frequency of the supply of the normal-consumption current to the lighting module 13 is higher than or equal to 16 times/second, and the power-saving current must be greater than or equal to the minimum exciting current of the lighting module 13.
  • the unit time is 1 second and divided into 1000 equal parts, and the normal-consumption current and the power-saving current are alternatively supplied by the power output loop 12 to the lighting module 13 at every 1/1000 second, as shown in FIG 3 , causing the lighting module 13 to emit light. Therefore, the power output loop 12 outputs the normal-consumption power to the lighting module 13 500 times in one second, the 20W consuming time is 1/2 second, and the 10W consuming time is 1/2 second, i.e., it saves about 25% of power consumption when compared with a conventional 20W fluorescent lamp.
  • the lighting module does not keep consuming the normal-consumption current 20W all the time within this 1 second, the supply frequency of the normal-consumption current 20W to the lighting module is higher than 16 times/second, the effect of the persistence of human vision makes people feel constant brightness of the lamp under the normal-consumption current. Therefore, saving of power consumption is achieved.
  • the minimum exciting current is 3W
  • the normal-consumption current is 20W
  • the power-saving current is 8W. If the unit time is 1 second and divided into 1000 equal parts and if the normal-consumption current and the power-saving current are alternatively supplied by the power output loop to the lighting module for 1/1000 second and 9/1000 second respectively, the power output loop outputs the normal-consumption power to the lighting module 100 times in one second, the 20W consuming time is 1/10second, and the 8W consuming time is 9/10 second, i.e., it saves about 54% of power consumption when compared with a conventional 20W fluorescent lamp.
  • the lighting module does not keep consuming the normal-consumption current 20W all the time within this 1 second, the supply frequency of the normal-consumption current 20W to the lighting module is higher than 16 times/second, the effect of the persistence of human vision makes people feel constant brightness of the lamp under the normal-consumption current. Therefore, saving of power consumption is achieved.
  • the invention is also applicable to cold cathode fluorescent lamp, HID (High-Intensity Discharge) lamp, as well as LED (Light Emitting Diode).
  • HID High-Intensity Discharge
  • LED Light Emitting Diode
  • the supplying time for normal-consumption current can be 3/10 and the supplying time for power-saving current can be 7/10. Accordingly, the invention is not to be limited except as by the appended claims.

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

Abstract

A lighting module power-saving control method in which a switching control loop (11) is installed in a lamp for outputting a high-frequency current output signal and a low-frequency current output signal, the length of a unit time is divided into multiple equal parts for enabling the power output loop (12) of the lamp to alternatively output a normal-consumption current and a power-saving current to the lighting module of the lamp subject to the control of the switching control loop (11), and the frequency of the supply of the normal-consumption current is not less than 16 times/second.

Description

    BACKGROUND OF THE INVENTION 1. Field of the Invention
  • The present invention relates to lighting module control means and more particularly, to a lighting module power-saving control method.
    • 2. Description of the Related Art
  • According to the light emitting mode of conventional light emitting devices including halogen lamp, incandescent lamp, fluorescent lamp, cold cathode fluorescent lamp, HID (High-Intensity Discharge) lamp, LED (Light Emitting Diode), a same power is consumed during lighting. For example, if a light emitting device is turned on with a watt consumption "w" and the length of turn-on period is "t", the light emitting device keeps consuming power supply at the watt consumption "w" within the whole length of turn-on period "t". If the length of the time period is divided into 1000 equal parts, the power consumption time of watt consumption "w" of the light emitting device is 1000/1000, as shown in FIG 1. Under certain conditions, this power consumption manner is a waste. If the light emitting device is not used for a special processing work but for illumination, it is not necessary to keep consuming power supply at the watt consumption "w" within the whole length of turn-on period "t" because of the persistence of human vision.
  • US 2005/0212461 pertains to a projection type video display apparatus comprising inter alia input means for inputting a power saving mode setting command to fix the luminance of a light source to a predetermined power saving level, average luminance level detection means for detecting the average luminance level of an input video signal and PWM generation means. The PWM generation means permits generation of a first PWM signal having a duty ratio corresponding to the average luminance level detected by the average luminance level detection means in a certain duty ratio range and of a second PWM signal with a duty ratio outside the predetermined duty ratio range when the power saving mode setting command is inputted. The PWM signal is used for controlling the luminance of the light source on the basis of the duty ratio of the inputted PWM signal.
    • SUMMARY OF THE INVENTION
  • The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a method of saving the power consumption of the lighting module of a lamp by means of the persistence of human vision.
  • To achieve this object of the present invention, the power-saving control method is used in a light emitting device having a power output loop and a lighting module to save power consumption. The method comprises installing a switching control loop in said light emitting device for controlling said power output loop at each time-sharing cycle, said time-sharing cycle dividing the length of a unit time into multiple equal parts for said power output loop; alternately outputting a normal-consumption current by said power output loop to said lighting module within a first predetermined length of time and a power-saving current by said power output loop to said lighting module within a second predetermined length of time, characterized in that the frequency of the supply of said normal-consumption current is not less than 16 times/second and that the power-saving current is greater than or equal to the minimum exciting current of the lighting module.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • FIG 1 is a schematic drawing showing the relationship between power consumption and time during operation of a light emitting device according to the prior art.
    • FIG 2 is a circuit diagram of a lamp in accordance with a first embodiment of the present invention.
    • FIG 3 is a schematic drawing showing the relationship between power consumption and time during operation of a lamp according to the first embodiment of the present invention.
    • FIG 4 is a schematic drawing showing the relationship between power consumption and time during operation of a lamp according to a second embodiment of the present invention.
    DETAILED DESCRIPTION OF THE INVENTION
  • FIG 2 is a circuit diagram of a lamp in accordance with a first embodiment of the present invention. As illustrated, the lamp comprises a DC power loop 10, a switching control loop 11 connected to the DC power loop 10, a power output loop 12 connected to the switching control loop 11, and a lighting module 13 connected to the power output loop 12. According to this embodiment, the lamp is a compact fluorescent lamp.
  • The switching control loop 11 provides a high-frequency current output signal and a low-frequency current output signal at a milli-second time division cycle. It divides the length of a unit time "t" into multiple equal parts in which signals are respectively outputted. The power output loop 12 executes output of different currents subject to the control of the switching control loop 11, i.e., the power output loop 12 is controlled by the switching control loop 11 to output a normal-consumption current to the lighting module 13 within a predetermined length of time, and to output a power-saving current to the lighting module 13 within another predetermined length of time. The frequency of the supply of the normal-consumption current to the lighting module 13 is higher than or equal to 16 times/second, and the power-saving current must be greater than or equal to the minimum exciting current of the lighting module 13.
  • In an example of a fluorescent lamp tube in which the minimum exiting current is 5W, the normal-consumption current is 20W, and the power-saving current is 10W, the unit time is 1 second and divided into 1000 equal parts, and the normal-consumption current and the power-saving current are alternatively supplied by the power output loop 12 to the lighting module 13 at every 1/1000 second, as shown in FIG 3, causing the lighting module 13 to emit light. Therefore, the power output loop 12 outputs the normal-consumption power to the lighting module 13 500 times in one second, the 20W consuming time is 1/2 second, and the 10W consuming time is 1/2 second, i.e., it saves about 25% of power consumption when compared with a conventional 20W fluorescent lamp. Although the lighting module does not keep consuming the normal-consumption current 20W all the time within this 1 second, the supply frequency of the normal-consumption current 20W to the lighting module is higher than 16 times/second, the effect of the persistence of human vision makes people feel constant brightness of the lamp under the normal-consumption current. Therefore, saving of power consumption is achieved.
  • According to a second embodiment of the present invention, as shown in FIG 4, the minimum exciting current is 3W, the normal-consumption current is 20W, and the power-saving current is 8W. If the unit time is 1 second and divided into 1000 equal parts and if the normal-consumption current and the power-saving current are alternatively supplied by the power output loop to the lighting module for 1/1000 second and 9/1000 second respectively, the power output loop outputs the normal-consumption power to the lighting module 100 times in one second, the 20W consuming time is 1/10second, and the 8W consuming time is 9/10 second, i.e., it saves about 54% of power consumption when compared with a conventional 20W fluorescent lamp. Although the lighting module does not keep consuming the normal-consumption current 20W all the time within this 1 second, the supply frequency of the normal-consumption current 20W to the lighting module is higher than 16 times/second, the effect of the persistence of human vision makes people feel constant brightness of the lamp under the normal-consumption current. Therefore, saving of power consumption is achieved.
  • In addition to fluorescent lamp, the invention is also applicable to cold cathode fluorescent lamp, HID (High-Intensity Discharge) lamp, as well as LED (Light Emitting Diode).
  • Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made, for example, the supplying time for normal-consumption current can be 3/10 and the supplying time for power-saving current can be 7/10. Accordingly, the invention is not to be limited except as by the appended claims.

Claims (3)

  1. A lighting module power-saving control method used in a light emitting device having a power output loop (12) and a lighting module (13), wherein the method comprises
    installing a switching control loop (11) in said light emitting device for controlling said power output loop (12) at each time-sharing cycle, said time-sharing cycle dividing the length of a unit time into multiple equal parts for said power output loop (12);
    alternately outputting a normal-consumption current by said power output loop (12) to said lighting module (13) for a first number of said equal parts defining a first predetermined length of time and a power-saving current by said power output loop (12) to said lighting module (13) for a second number of said equal parts defining a second predetermined length of time, characterized in that
    said normal-consumption current is supplied to said lighting module (13) not less than 16 times/second and that the power-saving current is not less than the minimum exciting current of said lighting module.
  2. The lighting module power-saving control method as claimed in claim 1, wherein said switching control loop (11) controls said power output loop (12) to output said normal-consumption current and said power-saving current to said lighting module at a milli-second time-sharing cycle.
  3. The lighting module power-saving control method as claimed in claim 1, wherein the total supplying time of said normal-consumption current in said unit time is longer than the total supplying time of said power-saving current in said unit time.
EP07006412A 2007-03-28 2007-03-28 Lighting module power-saving control method Active EP1976341B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP07006412A EP1976341B1 (en) 2007-03-28 2007-03-28 Lighting module power-saving control method
PL07006412T PL1976341T3 (en) 2007-03-28 2007-03-28 Lighting module power-saving control method
ES07006412T ES2317603T3 (en) 2007-03-28 2007-03-28 PROCEDURE TO CONTROL THE ENERGY SAVING OF A LIGHTING MODULE.
AT07006412T ATE413795T1 (en) 2007-03-28 2007-03-28 POWER SAVING CONTROL METHOD FOR A LIGHTING MODULE
DE602007000234T DE602007000234D1 (en) 2007-03-28 2007-03-28 Power saving control method for a lighting module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07006412A EP1976341B1 (en) 2007-03-28 2007-03-28 Lighting module power-saving control method

Publications (2)

Publication Number Publication Date
EP1976341A1 EP1976341A1 (en) 2008-10-01
EP1976341B1 true EP1976341B1 (en) 2008-11-05

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EP07006412A Active EP1976341B1 (en) 2007-03-28 2007-03-28 Lighting module power-saving control method

Country Status (5)

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EP (1) EP1976341B1 (en)
AT (1) ATE413795T1 (en)
DE (1) DE602007000234D1 (en)
ES (1) ES2317603T3 (en)
PL (1) PL1976341T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104135805A (en) * 2014-08-15 2014-11-05 中山顺富节能科技有限公司 Novel electricity-saving appliance

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484295A (en) * 1981-05-26 1984-11-20 General Electric Company Control circuit and method for varying the output of a waveform generator to gradually or rapidly vary a control signal from an initial value to a desired value
US5130608A (en) * 1990-11-02 1992-07-14 Nicholas Zahardis Electrical module and method for reducing power consumption of an incandescent light bulb
GB2369730B (en) * 2001-08-30 2002-11-13 Integrated Syst Tech Ltd Illumination control system
JP4180003B2 (en) * 2004-03-24 2008-11-12 三洋電機株式会社 Projection-type image display device

Also Published As

Publication number Publication date
PL1976341T3 (en) 2009-04-30
DE602007000234D1 (en) 2008-12-18
EP1976341A1 (en) 2008-10-01
ATE413795T1 (en) 2008-11-15
ES2317603T3 (en) 2009-04-16

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