EP1978789A1 - Dispositif d'alimentation pour lampe, en particulier pour une tour d'éclairage - Google Patents

Dispositif d'alimentation pour lampe, en particulier pour une tour d'éclairage Download PDF

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Publication number
EP1978789A1
EP1978789A1 EP07425204A EP07425204A EP1978789A1 EP 1978789 A1 EP1978789 A1 EP 1978789A1 EP 07425204 A EP07425204 A EP 07425204A EP 07425204 A EP07425204 A EP 07425204A EP 1978789 A1 EP1978789 A1 EP 1978789A1
Authority
EP
European Patent Office
Prior art keywords
generator
lamps
supplying device
igniters
supplying
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.)
Granted
Application number
EP07425204A
Other languages
German (de)
English (en)
Other versions
EP1978789B1 (fr
Inventor
Romano Fontanella
Dario Quaglia
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.)
Tekno Proget Srl
Original Assignee
Tekno Proget Srl
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 Tekno Proget Srl filed Critical Tekno Proget Srl
Priority to DE200760007048 priority Critical patent/DE602007007048D1/de
Priority to EP20070425204 priority patent/EP1978789B1/fr
Publication of EP1978789A1 publication Critical patent/EP1978789A1/fr
Application granted granted Critical
Publication of EP1978789B1 publication Critical patent/EP1978789B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • 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
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/18—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having a starting switch

Definitions

  • the present invention relates to a lamps supplying device.
  • the invention relates to a supplying device for a plurality of lamps, of the type comprising at least one generator for supplying a powering current and a spike current to said lamps.
  • the invention is particularly, but not exclusively, directed to a lamps supplying device for lamps comprised in a light tower, and the following description refers to this application field, but only in order to simplify its understanding.
  • light towers are illumination devices comprising a base on which a pole-like support is mounted, for holding lamps used for illuminating a specific area, such as for example a terrain portion in a construction site.
  • a light tower of the known type is schematically shown in Figure 1 and indicated with the reference number 1.
  • the light tower 1 comprises a base 2 formed by a supplying device 3 mounted on support and transport means 4, with rollover preventing means 5.
  • lamps 8 of the gas-discharge type employing metal halogenide, sodium and other materials having similar illumination properties.
  • illumination devices like light towers therefore comprise a supplying device equipped with a generator, adequately sized in order to ensure a sufficient start-up current for the lamps 8, i.e. the so called spike current.
  • Such a generator has various disadvantages primarily due to its bulk and consumption in its stand-by condition, i.e. not in the start-up phase of the lamps 8.
  • the sizing of the generator represents a critical factor in particular in mobile light towers 1, as the one shown as an example in Figure 1 , since it requires a suitable sizing of the support and transport means 4, with the requirement of adequate rollover preventing means 5, rendering the light tower 1 difficult to move, position and to use in general.
  • the design of the generator and generally of the most suitable supplying device is therefore of fundamental importance in order to provide light towers that are easy to use and operate reliably.
  • FIG. 2 The electric diagram of a first known technical solution for realising a supplying device for a plurality of lamps in a light tower 1 is schematically shown in Figure 2 , and is generally indicated by the reference number 23.
  • the supplying device 23 comprises a source 21 supplying a standard main voltage of 230 V, at a frequency of 50 Hz, as well as a plurality of ballasts 22, each with a first terminal connected to said source 21 and a second terminal connected to a respective igniter 24, in particular, a well known superimposed igniter, in turn connected to a respective lamp 8.
  • each ballast 22 functions as a reactor in order to limit the high spike current of the respective lamp 8 and to stabilize the current in this lamp 8, after the transient has ended.
  • the ballasts 22 however require a non negligible reactive power absorption, that imposes a re-phasing by suitable condensers, referred to as C, which are inserted between the source 21 and one common terminal T of the igniters 24 and the lamps 8.
  • the "hot" switch off and on of a lamp 8 entails a transient state (several minutes long), during which, the lamp 8, although powered, does not light on because of the excessive inner gas pressure, which is due to the high temperature of the same gas.
  • the progressive cooling of the lamp 8 and the following reduction of the inner gas pressure allows, at a certain time, the ignition of the electric arc and therefore the ignition of the lamp 8 itself.
  • the technical problem to be solved by the present invention is to envisage a supplying device for lamps in light towers, having structural and functional features which ensure a spike current value which is high enough to ignite the lamps, at the same time reducing the size with regard to surface and weight, overcoming the limitations which still affect the devices of the known art.
  • the solution idea at the basis of the present invention is that of using a suitably partitioned generator, such as to ensure a separate power supply for each lamp of the light tower, during normal operation and during ignition.
  • a supplying device for a plurality of lamps of the type comprising at least one generator, such as to provide a powering current and a spike current to said lamps, characterized in that said generator comprises a plurality of local generators, each local generator being connected, through a respective igniter, to one of said lamps, in order to supply said lamp with said powering current, as well as an auxiliary generator, connected to said igniters and such as to supply them with an auxiliary power supply, so that said igniters provide said spike current to said lamps.
  • a light tower comprising a supplying device according to the invention.
  • a supplying device according to the invention is schematically indicated by the reference number 30.
  • the supplying device 30 is connected to a plurality of lamps, in particular four discharge lamps for a light tower, indicated as L1-L4.
  • the supplying device 30 comprises a generator 31, which is started up by an internal combustion engine, not shown.
  • the generator 31 comprises a plurality of generators, in particular windings 32, which are associated, through a respective igniter 33, to one of said lamps L1-L4, which may be called local generators 32.
  • the generator 31 comprises a first local generator W1, which is inserted between an input terminal IN1 of a first igniter A1 and a first internal circuit node X1, the first igniter A1 having an output terminal OUT 1 connected to a first lamp L1, which is in turn connected to the first internal circuit node X1.
  • the generator 31 comprises:
  • the generator 31 comprises an auxiliary generator or winding 34 or Waux, inserted between the first internal circuit node X1 and a second internal circuit node X2, which is in turn connected to respective auxiliary supply terminals T1-T4 of igniters A1-A4 of lamps L1-L4.
  • each local generator for instance W1
  • the other local generators W2-W4 not even in critical conditions, as during the start-up phase.
  • the auxiliary generator 34 supplies the igniters 33 with an auxiliary power supply during the start-up phase of the lamps L1-L4, the igniters being therefore independent from the local generators 32, which supply the lamps L1-L4, even in normal working conditions.
  • the working of the igniters 33 is advantageously timed in order to reduce the thermal load on the same igniters, which takes place when the igniters have to dissipate more energy, i.e. when they are powered at a higher frequency. Therefore the supplying device 30 comprises a timer connected to the igniters 33.
  • the permanent magnet generator comprises a stator 40, as shown in Figure 4A .
  • the stator 40 has a plurality of windings 41.
  • the windings 41 are adequately divided into sectors, in order to form a plurality of generators, in particular local generators 32 and the auxiliary generator 34.
  • the stator 40 comprises a first sector Set 1, with six windings forming the first local generator W1 of the first lamp L1.
  • stator 40 comprises:
  • the three phase permanent magnet generator further comprises a bell-shaped iron rotor 42, with a plurality of poles 43 N and S of permanent magnets, which are evenly distributed on its internal circular perimeter, as schematically shown in Figure 4B .
  • the windings 41 of the stator 40 are coupled, three by three to a pair of poles 43 N and S and affect the magnetic flux F of said three windings 41 (indicated as A, B, C), so as to form the three phase system of the generator 31, as schematically shown in Figure 4C .
  • a permanent magnet multi-generator is therefore obtained, which is particularly compact and operates at frequencies in the range of 400-600 Hz.
  • the generator 31, in its entirety, may be considered as divided in a plurality of generators, in particular, in the illustrative and non limitative example of Figures 4A-4C , five independent (or at least partially independent) generators, i.e. five local generators 32.
  • the generator 31 is free of ballasts (differently from the described generators of the known art).
  • ballasts are possible due to the particular output characteristic of the permanent magnet generator.
  • the generator since the generator has a constant excitation, it has an output characteristic with a non negligible slope, so that the open voltage is higher than the load voltage (typically twice as much).
  • ballast generator with an "intrinsic" ballast is that it lacks any reactive element (unlike a traditional ballast), which would have to be compensated by another additional reactive element (such as the condenser C of the ballast generator realised according to the prior art).
  • the supplying device 30 comprises universal igniters for powering lamps of various types, for instance metallic iodide and sodium vapor lamps.
  • the main advantage of the supplying device according to the invention is its unusual compact size: in the same conditions, i.e. with the same lamp set to be switched on and powered, it provides a generator with a diameter and length reduced by 50% with respect to generators used in known devices. The weight is also greatly reduced.

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  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP20070425204 2007-04-06 2007-04-06 Dispositif d'alimentation pour lampe, en particulier pour une tour d'éclairage Expired - Fee Related EP1978789B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200760007048 DE602007007048D1 (de) 2007-04-06 2007-04-06 Versorgungseinrichtung für lampen, besonders für eines mobiles Beleuchtungssystem
EP20070425204 EP1978789B1 (fr) 2007-04-06 2007-04-06 Dispositif d'alimentation pour lampe, en particulier pour une tour d'éclairage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070425204 EP1978789B1 (fr) 2007-04-06 2007-04-06 Dispositif d'alimentation pour lampe, en particulier pour une tour d'éclairage

Publications (2)

Publication Number Publication Date
EP1978789A1 true EP1978789A1 (fr) 2008-10-08
EP1978789B1 EP1978789B1 (fr) 2010-06-09

Family

ID=38476938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070425204 Expired - Fee Related EP1978789B1 (fr) 2007-04-06 2007-04-06 Dispositif d'alimentation pour lampe, en particulier pour une tour d'éclairage

Country Status (2)

Country Link
EP (1) EP1978789B1 (fr)
DE (1) DE602007007048D1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745340A (en) 1983-07-14 1988-05-17 Herbert F. Koether Electric generator system for portable floodlighting equipment
GB2316555A (en) * 1996-08-15 1998-02-25 Marathon Electric Mfg Alternator assembly with inherent ballast impedance characteristic for operating a lamp

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745340A (en) 1983-07-14 1988-05-17 Herbert F. Koether Electric generator system for portable floodlighting equipment
GB2316555A (en) * 1996-08-15 1998-02-25 Marathon Electric Mfg Alternator assembly with inherent ballast impedance characteristic for operating a lamp

Also Published As

Publication number Publication date
DE602007007048D1 (de) 2010-07-22
EP1978789B1 (fr) 2010-06-09

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