EP1483944A1 - Ballast a bobine d'induction commutee - Google Patents

Ballast a bobine d'induction commutee

Info

Publication number
EP1483944A1
EP1483944A1 EP03714694A EP03714694A EP1483944A1 EP 1483944 A1 EP1483944 A1 EP 1483944A1 EP 03714694 A EP03714694 A EP 03714694A EP 03714694 A EP03714694 A EP 03714694A EP 1483944 A1 EP1483944 A1 EP 1483944A1
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
semiconductor switches
voltage
parallel
current
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
EP03714694A
Other languages
German (de)
English (en)
Other versions
EP1483944B1 (fr
Inventor
Ulrich Klipstein
Norbert Unzner
Wilfried Brauckmann
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.)
B & S Elektronische Gerate GmbH
Original Assignee
B & S Elektronische Gerate GmbH
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 B & S Elektronische Gerate GmbH filed Critical B & S Elektronische Gerate GmbH
Publication of EP1483944A1 publication Critical patent/EP1483944A1/fr
Application granted granted Critical
Publication of EP1483944B1 publication Critical patent/EP1483944B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2921—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2925—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Definitions

  • the invention relates to a ballast for a discharge lamp with a DC voltage supply stage, high-frequency clocked semiconductor switches for changing the current direction through the discharge lamp, a choke inductor lying in series with the discharge lamp, and discharge circuits for the semiconductor switches, each of which consists of a capacitor arranged in parallel with the semiconductor switch and an anti-parallel circuit Power converter exist.
  • Ballasts of this type are known and are used to control discharge lamps, in particular high-pressure discharge lamps.
  • the semiconductor switches can be arranged in a full bridge or in a half bridge.
  • a step-up converter is preferably used, which, for example, is able to form a 370 V DC voltage from a 220 V AC voltage, which can be used for supplying the discharge lamp.
  • the direction of the current through the discharge lamp is reversed by arranging the series inductor in conjunction with a series capacitor.
  • the relief circuits for the semiconductor switches serve to avoid current and voltage peaks when switching from one current direction to another when the previously open switch is still open and the previously closed switch is opened during a short time interval. The relief current flows into the relief capacitors via the inductor.
  • ballasts of this type exists when an undesired idling operation occurs, for example when the discharge lamp has failed or has not yet been used. Since the relief cannot be effective in these cases, there is a risk of the semiconductor switches being destroyed. With the known ballasts, care must therefore be taken to ensure that no idle operation occurs.
  • the invention is based on the object of designing a ballast of the type mentioned at the outset in such a way that effective relief is possible even when idling without impairing the regular operation of the ballast.
  • ballast of the type mentioned in the introduction in that a series connection of an auxiliary inductor and a switch which can be switched as a function of the voltage of the discharge lamp is arranged in parallel with the discharge lamp.
  • the invention is based on the idea that the voltage of the discharge lamp is significantly higher in the non-ignited mode than in the ignited mode. Accordingly, voltage detection of the voltage of the discharge lamp is used to make the switch in series with the auxiliary inductor close to enable the semiconductor switch to be relieved via the auxiliary inductor if the discharge lamp does not ignite due to a defect or is not used at all. If, on the other hand, the discharge lamp ignites, a current occurs in the lamp circuit, which is sensed and opens the switch, so that the auxiliary inductance remains ineffective for the ignited operation of the discharge lamp.
  • the auxiliary inductor has the task of ensuring a minimum current flow through the semiconductor switches. This current is significantly lower than the nominal current when the lamp is in operation, so that the auxiliary inductance can assume a value approximately five times greater than the main inductance.
  • the structural outlay for the auxiliary inductance can, however, be kept lower than for the main inductance, since on the one hand the current load is significantly lower and on the other hand the inductance only has to carry current for a short time through a suitable control.
  • the ballast according to the invention is preferably operated with a control circuit which controls the clock frequency of the semiconductor switches as a function of a detected current flow through the discharge lamp.
  • the drawing shows a schematic circuit diagram of an embodiment of a ballast according to the invention.
  • a DC voltage supply stage 2 in the form of a step-up converter is connected to terminals 1 of a mains voltage (220 V).
  • Schematically A rectifier bridge 3, a series inductor 4 and a switch 5 connected in parallel and a diode 6 are placed at a positive output of the DC voltage supply stage 2.
  • the DC voltage output by the DC voltage supply stage 2 on two output lines 7, 8 lies above a line between these lines 7, 8 switched smoothing capacitor 9 in smoothed form.
  • a series circuit comprising two semiconductor switches 10, 11 is switched on parallel to the capacitor.
  • the two semiconductor switches 10, 11 are switched on and off alternately by a control circuit 12 at a frequency of 300 to 400 kHz, the switching frequency depending on the current flowing via the respectively closed semiconductor switch 10, 11, measured with a current sensor 13 is regulated so as to generate a constant current.
  • the output line 7 carrying the positive direct voltage is connected via a capacitor 14 and an ignition transformer 15 to an electrode of a discharge lamp 16.
  • the other electrode of the discharge lamp 16 is connected via a series inductor 17 to a connection point 18 between the two semiconductor switches 10, 1 1.
  • the capacitor 14 is dimensioned such that about half of the DC voltage supplied drops across it. As a result, approximately half of the voltage across the discharge lamp 16 is present across the smoothing capacitor 9.
  • the capacitor 19 connected in parallel with the previously opened semiconductor switch 10, 1 1 is charged to the input voltage at the time of switching and takes over the second half of the current, so that it is discharged, so that the subsequent switching on of this semiconductor switch 10, 1 1 takes place without voltage and thus without loss.
  • the relief current also flows through the lamp circuit, that is to say the inductor 17, the lamp 16, the ignition transformer 15 and the capacitor 14.
  • an auxiliary inductor 21 is connected in series with a switch 22 in parallel with the arrangement of lamp 16 and ignition transformer 15, that is to say between circuit points 26, 27.
  • the switch 22 is closed, controlled by suitable sensors, as soon as the voltage between the switching points 26 and 27 approaches an open circuit voltage of approximately 185 V. As a result, a current flows through the auxiliary inductor 21, which ensures the above-described recharging of the capacitors 19 connected in parallel with the semiconductor switches 10, 11 instead of the lamp current.
  • the switch 22 is opened as soon as a lamp current of a certain size is sensed. This ensures that the function of the ballast is not changed by the auxiliary inductor during normal operation of the lamp 16, but that the auxiliary inductor 21 is only effective under idle conditions for generating the relief current.
  • a switch 23 is also connected in series with a parallel circuit comprising a capacitor 24 and a resistor 25. This circuit serves to support the ignition of the lamp 16.
  • the DC voltage present between the output lines 7, 8 is separated off via the capacitor 14, which charges to half the DC voltage.
  • the amplitude of the AC voltage occurring between the circuit points 26, 27 also only takes up half the value of the DC voltage. The magnitude of this voltage does not ensure reliable ignition of the lamp 16.
  • the capacitor 24 forms a resonant circuit with the inductor 17 and is dimensioned such that the resonant frequency of the resonant circuit comprising the inductor 17 and the capacitor 24 is at a higher harmonic of the switching frequency of the semiconductor switches 10, 11.
  • a harmonic voltage of the choke 17 is added to the square-wave voltage of the semiconductor switches 10, 11 present between the connection point 18 and the circuit point 27, so that the voltage amplitude required for the safe formation of the arc is achieved immediately after the lamp 16 is ignited.
  • the tuning of the series resonant circuit formed by choke inductor 17 and capacitor 24 to a higher harmonic, preferably the fifth harmonic, offers in connection with the damping by the parallel resistor. 25 there was a guarantee that the semiconductor switches 10, 1 1 would not be loaded with an overcurrent, as would be the case if the resonant circuit comprising the inductor 17 and the capacitor 24 were set directly to the resonance frequency of the switching frequency of the semiconductor switches 10, 1 1.
  • harmonics other than the fifth harmonic can be used for certain embodiments of the invention, for example the third harmonic.
  • the criterion for the selection of the harmonic is the safe setting of the desired voltage increase without the risk of overloading the semiconductor switches 10, 11 by overcurrent.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

La présente invention concerne un ballast pour une lampe à décharge (16) comprenant un étage d'alimentation en tension continue (2), des commutateurs semi-conducteurs à cadence haute fréquence (10, 11), qui sont conçus pour modifier le sens du courant traversant la lampe à décharge (16), une bobine d'induction (17), qui est montée en série par rapport à la lampe à décharge (16), ainsi que des circuits de décharge (19, 20) pour les commutateurs semi-conducteurs (10, 11), qui sont respectivement constitués d'un condensateur (19) monté en parallèle au commutateur semi-conducteur (10, 11) et d'un convertisseur de courant (20) connecté antiparallèle. L'objectif de la présente invention est d'assurer une décharge efficace des commutateurs semi-conducteurs (10, 11), même à l'état de fonctionnement à vide. Cet objectif est atteint par un montage en série, parallèle à la lampe à décharge (16), d'une bobine d'induction auxiliaire (21) et d'un commutateur (22) pouvant être commuté en fonction de la tension de la lampe à décharge (16).
EP03714694A 2002-03-12 2003-03-06 Ballast a bobine d'induction commutee Expired - Lifetime EP1483944B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10210804 2002-03-12
DE2002110804 DE10210804B4 (de) 2002-03-12 2002-03-12 Vorschaltgerät für eine Entladungslampe
PCT/DE2003/000785 WO2003077611A1 (fr) 2002-03-12 2003-03-06 Ballast a bobine d'induction commutee

Publications (2)

Publication Number Publication Date
EP1483944A1 true EP1483944A1 (fr) 2004-12-08
EP1483944B1 EP1483944B1 (fr) 2006-07-12

Family

ID=27797706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03714694A Expired - Lifetime EP1483944B1 (fr) 2002-03-12 2003-03-06 Ballast a bobine d'induction commutee

Country Status (4)

Country Link
EP (1) EP1483944B1 (fr)
AU (1) AU2003218949A1 (fr)
DE (2) DE10210804B4 (fr)
WO (1) WO2003077611A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110571815B (zh) * 2019-07-31 2023-01-10 全球能源互联网研究院有限公司 一种基于阻容器件的可控卸荷模块，电路及控制方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2466169A1 (fr) * 1979-09-20 1981-03-27 Nicolas Jean Pierre Montage d'alimentation variable pour lampes a decharge haute-pression
FR2516737A1 (fr) * 1981-11-17 1983-05-20 Ceske Vysoke Uceni Tech Circuit monte en serie avec une source lumineuse a decharge
US5677602A (en) * 1995-05-26 1997-10-14 Paul; Jon D. High efficiency electronic ballast for high intensity discharge lamps
DE19619745A1 (de) * 1996-05-15 1997-11-20 Tridonic Bauelemente Schaltungsanordnung zum Betreiben einer Last und elektronisches Vorschaltgerät mit einer derartigen Schaltungsanordnung zum Betreiben einer Lampe
GB9825298D0 (en) * 1998-11-18 1999-01-13 Microlights Ltd An electronic ballast

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03077611A1 *

Also Published As

Publication number Publication date
DE10210804B4 (de) 2004-05-27
DE50304223D1 (de) 2006-08-24
WO2003077611A1 (fr) 2003-09-18
DE10210804A1 (de) 2003-10-09
AU2003218949A1 (en) 2003-09-22
EP1483944B1 (fr) 2006-07-12

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