EP2224791B1 - Electronic power supply unit for a discharge lamp, lighting system and method of lighting a discharge lamp - Google Patents

Electronic power supply unit for a discharge lamp, lighting system and method of lighting a discharge lamp Download PDF

Info

Publication number
EP2224791B1
EP2224791B1 EP09180359A EP09180359A EP2224791B1 EP 2224791 B1 EP2224791 B1 EP 2224791B1 EP 09180359 A EP09180359 A EP 09180359A EP 09180359 A EP09180359 A EP 09180359A EP 2224791 B1 EP2224791 B1 EP 2224791B1
Authority
EP
European Patent Office
Prior art keywords
lamp
power supply
voltage
supply unit
electronic power
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.)
Not-in-force
Application number
EP09180359A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2224791A2 (en
EP2224791A3 (en
Inventor
Agostino Barbati
Franco Farfarini
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.)
Dossena SNC Di Barbati Agostino & C
Original Assignee
Dossena SNC Di Barbati Agostino & C
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Publication date
Application filed by Dossena SNC Di Barbati Agostino & C filed Critical Dossena SNC Di Barbati Agostino & C
Publication of EP2224791A2 publication Critical patent/EP2224791A2/en
Publication of EP2224791A3 publication Critical patent/EP2224791A3/en
Application granted granted Critical
Publication of EP2224791B1 publication Critical patent/EP2224791B1/en
Not-in-force 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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices

Definitions

  • the present invention relates to an electronic power supply unit for lamps, in particular for cold cathode discharge lamps, a lighting system and relative method of lighting a cold cathode discharge lamp.
  • Power supply units for lamps commonly known as 'ballast', which send an impulse to a terminal of the lamp for the entire amount of its value (typically up to 5kV; figure 1 ) are known of in the art.
  • Such impulse causes an impulse current "Ii” in the stray capacitance "Cpu2"; the current of which must be closed through the stray input capacitances Cpi crossing the circuits of the power supply unit once again (which does not normally have galvanic isolation barriers, and, where such exist, said barriers would be put under dangerous stress by the return impulse).
  • the insulation may be jeopardised; moreover the impulse present on the input propagates itself onto the line causing disturbance to the other equipment as well as electromagnetic disturbance.
  • the Cpu capacity the dielectric of which is composed of the sheath of the connection cable to the lamp, is under stress with almost 5 kV and may therefore give rise to discharge in the presence of damp or with ageing.
  • the current Ii must be supplied by the power supply unit and is subtracted from the current which it should supply to the lamp to ionise the gas contained in the burner.
  • the electronic power supply units for discharge lamps of the known art create limitations to the maximum length of the lamp connection cables or maximum stray earthing capacitance of the same; for this reason the manufacturers pose constraints in this sense.
  • the purpose of the present invention is to realise a power supply unit which resolves the limitations and drawbacks mentioned with reference to the known art.
  • figure 1 shows a schematic view of a lighting system according to the known art
  • figure 2 shows a schematic view of a lighting system according to the present invention
  • figure 3 shows a schematic view of a detail of the system according to the present invention.
  • reference numeral 4 globally denotes a power supply unit comprising a capacitor discharge electronic power supply circuit 8 suitable to trigger an associable lamp 12.
  • the electronic power supply circuit 8 is suitable to receive a mains voltage in input and to generate an impulse voltage in output to trigger the associable lamp 12.
  • the circuit 8 comprises a pair of input terminals 16, through which the mains voltage V cc is supplied to power the circuit 8, and a pair of output terminals 18 electrically connected to said lamp 12.
  • the circuit 8 comprises a control switch 20 equipped with a relative control terminal 24.
  • the control switch 20 is powered by a high powered mains voltage generator.
  • the circuit 8 comprises, in addition, a transformer 26 having a primary winding 28 and a secondary winding 32.
  • the primary winding 28 receives the power supply voltage from the input terminals 16 and the secondary winding 32 receives the voltage from the primary winding 28 multiplied by the relative transformation ratio of the transformer 26.
  • the circuit 8 Upline of the primary winding 28 the circuit 8 comprises a condenser 36 charged by the mains voltage, for instance of 300-400V.
  • a resistance 40 is placed between the condenser and the primary winding.
  • the secondary winding 32 is divided into two semi-windings 44', 44" each one of which dispenses half the impulse voltage needed to trigger the lamp. For example, to trigger 5kV, each of the two semi-windings 44' e 44" will dispense 2.5 kV.
  • a voltage generator 48 is preferably placed halfway along the two semi-windings 44', 44", in other words is in series with them.
  • said voltage generator 48 is of the variable voltage and frequency type.
  • a shunt 53 that is current deviator is positioned in series with the voltage generator 48. Said shunt 53 is able to measure the current sent through the voltage generator 48to the lamp 12.
  • the potential of the two ends of the generator 48 differs from earth only slightly (about a hundred V).
  • the generator 48 powers the lamp 12 providing it with the voltage V lamp so as to keep it lit subsequent to its being triggered.
  • the two semi-windings 44', 44" are 'phased' so that at the ends of the lamp 12 there are two impulses of 2.5 kV of opposite polarity.
  • the lamp feels' a total of 5 kV between its two ends, needed to trigger it.
  • control switch 20 when the control switch 20 receives an impulse, sent through the relative control terminal 24, the control switch 20 becomes a short-circuit; so that the condenser 36 finds itself in parallel with the primary winding 28 of the transformer 26.
  • Such impulse is summed with the voltage dispensed by the generator 48, in series with the secondary winding 32.
  • the lamp 12 is triggered and the generator 48 keeps it lit subsequent to it being triggered.
  • the transformer 26 is traversed by the operating current of the lamp 12 but is designed to saturate itself with such current, thereby ensuring minimum power loss.
  • the electronic power supply unit 4 comprises in addition a microprocessor 59 which is electrically connected, by means of connections 50, 51 to the shunt 53 and to the generator 48.
  • the microprocessor 59 measures the voltage and power supply current of the lamp 12 by means of the connection 50; moreover the microprocessor 59 is able to control the voltage and frequency parameters of the generator 48 by means of the command 51.
  • the microprocessor 59 comprises a connection 52 by which the microprocessor 59 connects to the switch 20 and is able to control the temporal moment in which the switch 20 receives the closure impulse
  • the power supply unit comprises devices able to memorise the thermal image of the lamp.
  • the thermal image of the lamp it is known that when a lamp is cold it can be triggered immediately but that when the same lamp is hot (has been turned off a short time previous) then it is generally necessary to wait for it to cool down. If this were not the case there would a risk of non-triggering or of damage to the electrodes in that the spark erodes the hot electrodes more easily given that in such conditions the metal is much softer.
  • the power supply unit of the present invention create and memorises a thermal image of the lamp; so that if this is found to be 'cold' at the moment of supplying voltage to light it, the lamp will be triggered immediately.
  • This functioning mode provides maximum protection of the lamp with minimum downtime while waiting to retrigger.
  • the power supply unit protects the lamps for the minimum time needed for them to cool and therefore prevent damage.
  • the condenser 36 To achieve lighting of the lamp the condenser 36 must be charged.
  • the switch 20 can be turned off at any moment during charging of the condenser 36 so as to obtain a discharge of varying voltage and consequently a triggering voltage of the lamp which, being worth 5 kV when fully charged at 36 can be proportionally inferior starting from little more than 1 kV.
  • This leads to triggering attempts at increasing voltages being obtained (a new or good quality lamp will trigger at relatively low voltages while a "hard” or old lamp needs higher voltages of up to 5 kV).
  • the processor 59 reads the current off the shunt 53 and stops the triggering attempts. The lamp will have been triggered at a barely sufficient impulse voltage and will therefore be subject to less wear.
  • the lamp is, for example, generally stressed, between its ends with 5 kV, obtained with voltages ⁇ V imp on the terminals of ⁇ 2.5 kV.
  • the value of 5 kV is purely indicative; the invention being applicable to lamps 12 having variable triggering voltages.
  • the two impulse currents will also be of the same value but opposing polarity
  • the lamp is lit gradually: in fact at the moment of lighting the power supply unit 4 begins to dispense a series of impulses, generally limited to a total of about 2.5 kV, to the lamp 12, continuing then with repeated impulses at gradually increasing voltages reaching the 5 kV total after about 20 seconds.
  • the impulses on the output terminals 18 are always of the same intensity and of opposite polarity so as to supply the lamp 12 an overall voltage equal to the sum of the voltages on said output terminals 18.
  • the initial overall voltage equal to the sum of the voltages ⁇ V imp on the output terminals 18, is about 2.5kV and up to 5.0kV if necessary to trigger the lamp 12.
  • the rate of increase of the voltage on the output terminals 18 is from 0.10 kV/s to 0.15 kV/s; preferably said rate is equal to about 0.125 kV/s.
  • the connections 50 make it possible to read the current and voltage of the lamp 12 and the processor 59 can calculate the power which the lamp absorbs. This makes it possible to plan appropriate run-up phases and maintain constant power to the lamp. The same consumed power and the same luminous emission of different lamps at different stages of their useful life, even up to half-dead lamps, may thus be obtained. All this would be absolutely impossible with a traditional power supply unit based on electromechanical ballast.
  • the control performed by the microprocessor 59 permits further lamp dead signalling functions as well as preventing the tiresome periodic flashing of the lamp when close to dead, thanks to the continuous monitoring of the functioning parameters of the lamp.
  • the power supply unit according to the invention makes it possible to overcome the drawbacks mentioned in relation to the known art.
  • the power supply unit is of a limited size and suitable for the great majority of luminaires on sale.
  • the power supply unit of the present invention has a high yield, of over 96%, and thus permits a considerable saving of energy compared to the electromechanical ballast of the known art.
  • the power supply unit of the present invention can function at temperatures of over 50°C present at specific moments inside the luminaires.
  • the piloting of the lamp is performed in low frequency ( ⁇ 200Hz) to prevent any acoustic resonance phenomena.
  • the power supply unit of the present invention has a high MTBF (mean time between failures) reliability, no lower than the best electromechanical ballast of the known art.
  • the power supply unit has a very high power factor (close to one) thereby preventing the circulation of reactive power and exploiting the supply system to the most.
  • the power supply unit presents, in addition, low harmonic distortion on the current and insensitivity to mains voltage variations, even within extremely wide limits, of 180 V to 250 V.
  • the power supplied to the lamp is constant and equal to the nominal power, essentially throughout the lifespan of the lamp itself.
  • the present invention also makes it possible to reduce the energy consumption (to less than half) of most or all of the system, at predefined times, generally in the middle of the night, by means of two methods:
  • the power supply unit makes it possible to prevent excessive reduction of the power with the ageing of the lamp without creating disservice; in other words an "elderly" lamp no longer permits great power reductions but the power supply unit according to the present invention keeps it lit without the periodic end-life on/off typical of electromechanical piloting of the power supply units of the known art.
  • the power supply unit allows the parameters of consumption, temperature, ageing index of the lamp, hours of diagnostics and many other remote data (when connected up)to be known.
  • the power supply unit permits a good rejection of disturbance and ensures resistance to the overvoltage induced by atmospheric discharge.
  • the power supply unit adapts to various lamp powers, such as for example lamps of 70, 100, 150, 250 W; in addition it also adapts to different lamp technologies.
  • the Cpu capacities, the dielectric of which is composed of the sheath of the connection cable to the lamp are stressed with half the voltage of the power supply units of the known art, that is with only 2. 5 kV.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP09180359A 2008-12-22 2009-12-22 Electronic power supply unit for a discharge lamp, lighting system and method of lighting a discharge lamp Not-in-force EP2224791B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000375A ITPD20080375A1 (it) 2008-12-22 2008-12-22 Alimentatore elettronico per lampade a scarica, impianto di illuminazione e metodo di accensione di lampade a scarica

Publications (3)

Publication Number Publication Date
EP2224791A2 EP2224791A2 (en) 2010-09-01
EP2224791A3 EP2224791A3 (en) 2011-04-20
EP2224791B1 true EP2224791B1 (en) 2012-04-18

Family

ID=41211735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09180359A Not-in-force EP2224791B1 (en) 2008-12-22 2009-12-22 Electronic power supply unit for a discharge lamp, lighting system and method of lighting a discharge lamp

Country Status (3)

Country Link
EP (1) EP2224791B1 (it)
AT (1) ATE554637T1 (it)
IT (1) ITPD20080375A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107645239A (zh) * 2017-10-10 2018-01-30 深圳市信电科技有限公司 用于高能离子空气净化器的高压驱动电源

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3210690B2 (ja) * 1991-07-25 2001-09-17 松下電工株式会社 放電灯点灯装置
US5677602A (en) * 1995-05-26 1997-10-14 Paul; Jon D. High efficiency electronic ballast for high intensity discharge lamps
US6456015B1 (en) * 1996-10-16 2002-09-24 Tapeswitch Corporation Inductive-resistive fluorescent apparatus and method
CA2261316C (en) * 1997-05-21 2006-01-10 Gunther Hirschmann Ignition device for a discharge lamp and method for igniting a discharge lamp
US7187139B2 (en) * 2003-09-09 2007-03-06 Microsemi Corporation Split phase inverters for CCFL backlight system
US20080203939A1 (en) * 2004-10-19 2008-08-28 Koninklijke Philips Electronics, N.V. Method and Arrangement for Monitoring a Gas Discharge Lamp
US7781981B2 (en) * 2004-12-16 2010-08-24 Hep Tech Co. Ltd. Circuit arrangement for a starting unit of a discharge lamp
JP4462119B2 (ja) * 2005-06-10 2010-05-12 セイコーエプソン株式会社 バラスト及びプロジェクタ

Also Published As

Publication number Publication date
EP2224791A2 (en) 2010-09-01
ITPD20080375A1 (it) 2010-06-23
ATE554637T1 (de) 2012-05-15
EP2224791A3 (en) 2011-04-20

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