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EP1115272A1 - Méthode et système pour lampe à décharge - Google Patents

Méthode et système pour lampe à décharge Download PDF

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Publication number
EP1115272A1
EP1115272A1 EP00100375A EP00100375A EP1115272A1 EP 1115272 A1 EP1115272 A1 EP 1115272A1 EP 00100375 A EP00100375 A EP 00100375A EP 00100375 A EP00100375 A EP 00100375A EP 1115272 A1 EP1115272 A1 EP 1115272A1
Authority
EP
European Patent Office
Prior art keywords
frequency
discharge lamps
lamps
high frequency
large capacity
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Withdrawn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
EP00100375A
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German (de)
English (en)
Inventor
Issei Yoshitake
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP00100375A priority Critical patent/EP1115272A1/fr
Publication of EP1115272A1 publication Critical patent/EP1115272A1/fr
Withdrawn legal-status Critical Current

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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
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
    • H05B41/245—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency for a plurality of lamps

Definitions

  • This invention relates to method and system for lighting a plurality of light sources of discharge type, i.e., discharge lamps.
  • Discharge lamps typically in the form of metal-halide lamps, fluorescent lamps or the like are connected to commercial power supply usually available for such purpose and usually stabilizers (choke coils) are connected to the respective discharge lamps.
  • the commercial power supply (100V or 200V/50Hz or 60Hz) is generally used as a power source for the discharge lamps.
  • respective florescent lamps 1a, 1b,...1n are parallelly connected to commercial power supply E1 and stabilizers 10 are connected between the power supply E1 and the respective fluorescent lamps.
  • the frequency of the current fed from the power supply E1 is as low as 50Hz or 60Hz and inductance of each stabilizer 10 correspondingly increases. Consequently, the stabilizers necessarily become bulky and heavy. Copper loss as well as iron loss during lighting are also remarkable and Joule heat generated by the stabilizers converts approximately 15 ⁇ 20% of the full power fed from the power supply to heat.
  • a cost of equipment is relatively low, but it is impossible to achieve a high running efficiency and a cost for air conditioning the illuminated site.
  • various sites utilizing a plurality of discharge lamps such as offices, factories and the other operation centers may frequency convert the commercial power supply of low frequency usually available for the purpose of lighting the discharge lamps to the large capacity high frequency current and then light these discharge lamps via the high frequency stabilizers associated with the respective discharge lamps.
  • the high frequency stabilizers serve to eliminate undesirable noise due to low frequency and at the same time to lower a level of current.
  • the lowered level of current correspondingly lowers generation of Joule heat to 1/10 ⁇ 1/20 of the level which has been inevitable in the conventional stabilizers.
  • the respective choke coils can have their number of turns correspondingly reduced and material of the iron cores also can be saved. With a consequence, not only a copper loss but also an iron can be remarkably alleviated.
  • a durability of the high frequency stabilizers is thereby remarkably improved so that these stabilizers are substantially free from a demand for repair as well as maintenance.
  • These small-sized stabilizers may be installed on elevated spots of said offices, factories, operation centers or the like to light a plurality of discharge lamps.
  • the large capacity frequency converter is rather apt to be accompanied with various problems such as a significant temperature fluctuation, noise and wear. Accordingly, only this large capacity frequency converter may be isolatably installed at a place which facilitates the converter to be repaired and/or maintained.
  • This invention provides also the method according to Claim 1, wherein said discharge lamps are metal-halide lamps, fluorescent lamps, sodium vapor lamps, neon tube lamps or mercury vapor lamps.
  • This invention further provides the method according to Claim 1 or 2, wherein, after a step of frequency conversion, the current has a frequency of 25KHz or higher.
  • this invention provides the method according to any one of Claims 1 ⁇ 3, further comprising a step of controlling a frequency of said large capacity high frequency current during said step of frequency conversion to dim the discharge lamps.
  • the large capacity frequency converter may be frequency-controlled during the step of frequency conversion to dim the discharge lamps because the level of current is lowered and luminance of the discharge lamps are reduced as the frequency is increased.
  • This invention provides, according to another aspect thereof, a system for lighting a plurality of discharge lamps comprising a large capacity frequency converter connected to commercial power supply of low frequency and a plurality of high frequency stabilizers via which the corresponding number of said discharge lamps are parallelly connected to secondary current side of said large capacity frequency converter.
  • the commercial power supply available at low frequency may be converted to high frequency current by said large capacity frequency converter installed at a place suitable for sound insulation, heat radiation, repair and maintenance and a plurality of discharge lamps installed at elevated spots may be lit with a relatively small power consumption via the stabilizers of high frequency type substantially free from generation of heat as well as of noise.
  • these stabilizers also can be installed at elevated spots because they are small-sized, lightweight and practically free from repair and maintenance.
  • this invention provides the system according to Claim 5, wherein said large capacity frequency converter is isolated by soundproof wall from said high frequency stabilizers and said discharge lamps.
  • this invention provides the system according to Claim 5 or 6, wherein said large capacity frequency converter is thermally isolated from said high frequency stabilizers and said discharge lamps.
  • this invention provides the system according to any one of Claims 5 ⁇ 7, wherein said discharge lamps are metal-halide lamps, fluorescent lamps, sodium vapor lamps, neon tube lamps or mercury vapor lamps.
  • this invention provides the system according to any one of Claims 5 ⁇ 8, wherein, after frequency converted, said large capacity high frequency current has a frequency of 25KHz or higher.
  • this invention provides the system according to any one of Claims 5 ⁇ 9, wherein a frequency of said large capacity high frequency current is controlled by said large capacity frequency converter in a range of 25KHz or higher to dim the discharge lamps.
  • this invention provides the system according to any one of Claims 5 ⁇ 9, wherein each of said high frequency stabilizers comprises a choke coil having a relatively small number of turns and a capacitor adapted to cause series resonance of the current fed to said discharge lamps to light these discharge lamps.
  • this invention provides the system according to any one of Claims 5 ⁇ 11, wherein said choke coil making a part of said high frequency stabilizer includes an iron core made of lightweight material such as ferrite.
  • a reference numeral 3 designates a frequency converter of a sufficiently large capacity to support lighting, for example, of 30-100 or more 40W discharge lamps.
  • a feeder line L1 is connected between said large capacity frequency converter 3 and commercial power supply usually available for the purpose of said lighting to feeds this converter 3 with electric power of 100V or 200V at low frequency of 50Hz or 60Hz, respectively, as primary current E1.
  • a feeder line L2 is connected to discharge lamps 1a, 1b,...1n and feeds them with secondary current E2 via high frequency stabilizers 4a, 4b,...4n, respectively.
  • the large capacity frequency converter 3 may be isolated from the high frequency stabilizers and the discharge lamps by a partition 5 or the like provided with air conditioning and soundproof equipment to achieve desired effects of heat radiation, heat insulation and sound insulation for the converter 3.
  • Said large capacity frequency converter 3 converts said primary current of low frequency, for example, to high frequency current of 25KHz to be fed to the feeder line L2 as the secondary current.
  • Each of said high frequency stabilizers comprises a choke coil and a capacitor adapted to induce series resonance of the current fed to the discharge lamp associated with this stabilizer during lighting of this discharge lamp.
  • the choke coil can have its number of turns substantially decreased and a relatively lightweight material such as ferrite can be used to form an iron core because the current fed to the discharge lamp is of high frequency. Consequently, the respective high frequency stabilizers 4a ⁇ 4n are reduced in their sizes to 1/10 or less, on one hand, and in their weight to 1/5 or less, on the other hand, of those of the conventional stabilizers.
  • these stabilizers can be substantially miniaturized.
  • a decrease in the number of turns enables a copper loss to be correspondingly alleviated and use of ferrite as material for the iron core enables an iron loss also to be correspondingly alleviated.
  • generation of Joule heat also is alleviated to 1/10 ⁇ 1/20 of such heat possibly generated by the conventional stabilizers.
  • the high frequency is advantageous to avoid generation of noise.
  • the method and system according to this invention for lighting discharge lamps is characterized in that the commercial power supply at low frequency is frequency converted to the large capacity high frequency current and the respective discharge lamps are parallelly connected to said large capacity high frequency current via the high frequency stabilizers associated with the respective discharge lamps.
  • the various sites utilizing a plurality of discharge lamps such as offices, factories and the other operation centers may frequency convert the commercial power supply of low frequency usually available for the purpose of lighting the discharge lamps to the large capacity high frequency current and then light these discharge lamps via the high frequency stabilizers associated with the respective discharge lamps.
  • the high frequency stabilizers serve to eliminate undesirable noise due to low frequency and at the same time to lower a level of current.
  • the lowered level of current correspondingly lowers generation of Joule heat to 1/10 ⁇ 1/20 of the level which has been inevitable in the conventional stabilizers.
  • the respective choke coils can have their number of turns correspondingly reduced and material of the iron cores also can be saved. With a consequence, not only a copper loss but also an iron can be remarkably alleviated.
  • a durability of the high frequency stabilizers is thereby remarkably improved so that these stabilizers are substantially free from a demand for repair as well as maintenance.
  • These small-sized stabilizers may be installed on elevated spots of said offices, factories, operation centers or the like to light a plurality of discharge lamps.
  • the large capacity frequency converter is rather apt to be accompanied with various problems such as a significant temperature fluctuation, noise and wear. Accordingly, only this large capacity frequency converter may be isolatably installed at a place which facilitates the converter to be repaired and/or maintained.
  • This invention enables the large capacity high frequency current to be frequency-controlled during the frequency conversion to achieve a dimming effect.
  • this invention enables generation of Joule heat from the respective high frequency stabilizers to be substantially reduced and thereby to reduce a power consumption as well as a cost necessary to operate an air conditioner installed at the site to be illuminated.
  • this invention effectively solves the problem of offensive noise peculiar to the low frequency generated from the conventional stabilizers by adopting the stabilizers of high frequency current type.

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  • Circuit Arrangements For Discharge Lamps (AREA)
EP00100375A 2000-01-07 2000-01-07 Méthode et système pour lampe à décharge Withdrawn EP1115272A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00100375A EP1115272A1 (fr) 2000-01-07 2000-01-07 Méthode et système pour lampe à décharge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00100375A EP1115272A1 (fr) 2000-01-07 2000-01-07 Méthode et système pour lampe à décharge

Publications (1)

Publication Number Publication Date
EP1115272A1 true EP1115272A1 (fr) 2001-07-11

Family

ID=8167588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00100375A Withdrawn EP1115272A1 (fr) 2000-01-07 2000-01-07 Méthode et système pour lampe à décharge

Country Status (1)

Country Link
EP (1) EP1115272A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1675441A1 (fr) * 2004-12-23 2006-06-28 Chou, Han-Chi Stabilisateur électronique pour lampe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152026A1 (fr) * 1984-02-03 1985-08-21 Omega Electronics S.A. Dispositif d'alimentation pour commander l'intensité lumineuse d'au moins une lampe à décharge et utilisation dudit dispositif
US4751398A (en) * 1986-03-18 1988-06-14 The Bodine Company Lighting system for normal and emergency operation of high intensity discharge lamps
EP0380795A1 (fr) * 1989-01-30 1990-08-08 Kabushiki Kaisha Denkosha Dispositif d'allumage pour lampe de décharge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152026A1 (fr) * 1984-02-03 1985-08-21 Omega Electronics S.A. Dispositif d'alimentation pour commander l'intensité lumineuse d'au moins une lampe à décharge et utilisation dudit dispositif
US4751398A (en) * 1986-03-18 1988-06-14 The Bodine Company Lighting system for normal and emergency operation of high intensity discharge lamps
EP0380795A1 (fr) * 1989-01-30 1990-08-08 Kabushiki Kaisha Denkosha Dispositif d'allumage pour lampe de décharge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1675441A1 (fr) * 2004-12-23 2006-06-28 Chou, Han-Chi Stabilisateur électronique pour lampe

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