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
  • H05B41/282—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
  • H05B41/2825—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 by means of a bridge converter in the final stage
  • H05B41/2827—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 by means of a bridge converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations

Definitions

• ECG Electronic Ballast
• the invention relates to an electronic ballast (EVG) for operating a lamp arrangement according to the preamble of patent claim 1.
• ESG electronic ballast
• Discharge lamps are often operated with the aid of electronic ballasts, which transform the low-frequency power supply voltage into a high-frequency AC voltage. As a result, the efficiency of the lamps is increased and a longer life is achieved.
• the invention has for its object to provide an electronic ballast (ECG) for operating a lamp assembly, in which compared to conventional solutions evenly lit all lamps and protection against premature ignition and electric shock with the lowest possible manufacturing costs are possible.
• ECG electronic ballast
• the electronic ballast according to the invention for operating a lamp arrangement with at least one lamp, in particular a low-pressure discharge lamp has at least one transformer for balancing the lamp currents, wherein the transformer has two windings which are associated with one or more lamps of the lamp assembly.
• the transformer is designed as a saturation-symmetrizing throttle.
• this inductor symmetrizes the lamp currents, so that both lamps have their ends uniformly lit in a single lamp as well as in a series connection of several lamps, while on the other hand they limit the occurring voltages by a defined saturation of the ferromagnetic transformer core.
• the current at which the saturation occurs is set such that a decoupling of the windings of the transformer already occurs at a voltage substantially lower than that necessary for the ignition of the lamps. Tensions that cause premature ignition during the preheat phase and thus to a Damage to the lamps will be prevented. Furthermore, voltages are prevented which lead to unintentional ignition and thus to an accident risk of electric shock to the user. As a result, it is possible to dispense with separate safety circuits, as required in conventional solutions.
• the saturation-balancing choke is set so that the saturation of the ferromagnetic core occurs at a current in the range of 5 - 50 mA.
• the electronic Vorschal t Mixing of a series resonant circuit, which consists of a coil and a capacitor.
• the windings of the transformers preferably have the same number of turns and are arranged with opposite winding system.
• a first winding of the transformer is arranged in front of the lamp arrangement and a second winding of the transformer after the lamp arrangement. This ensures that the currents in front of and behind a lamp arrangement consisting of one or more lamps are balanced and all the lamps of the lamp arrangement or the two ends of a single lamp shine uniformly bright.
• a first winding of the transformer is arranged upstream of the lamp arrangement, and a second winding of the transformer is arranged downstream of the lamp arrangement.
• the balancing transformer also works as a differential current transformer and symmetrizes the partial currents in the parallel teten power branches. This measure ensures that all lamps of the lamp assembly shine brightly even in parallel-connected current branches.
• the electronic ballast on two parallel-connected current branches, each with at least one Lameln penan angel, wherein the first winding of the transformer after the first
• Lamp assembly is arranged.
• one winding of an additional balancing transformer is connected upstream of the lamp arrangement in the parallel-connected current branches. This works, as already explained, as a differential current transformer and symmetrizes the partial currents in the parallel-connected current branches, to ensure that all the lamps of the lamp assembly shine the same bright.
• the series resonant circuit is preferably arranged before the parallel connection of the two Stromzweigc.
• a fourth variant of the invention with two parallel-connected current branches and in each case at least one lamp arrangement, the first winding of the transformer is connected after the first lamp arrangement and the second winding of the transformer after the second lamp arrangement, wherein the lamp arrangement in each case a separate series resonant circuit in the current branches vorge- is switched.
• This symmetrizes the partial currents in the parallel-connected current branches, which may differ from each other, for example due to different manufacturing tolerances of the electronic components (coils, capacitors, etc.). This ensures that the lamps in the parallel-connected current branches light up brightly.
• the described lamp arrangement may comprise one or more lamps according to one embodiment.
• the electronic ballast is preferably designed as an inverter, in particular as a half-bridge inverter.
• FIG. 1 shows a schematic circuit arrangement of an electronic ballast according to a first embodiment
• Figure 2 is a schematic circuit arrangement of an electronic Vorschal telecommunications according to a second exemplary embodiment
• Figure 3 shows a schematic circuit arrangement of an electronic ballast according to a third embodiment
• Figure 4 shows a schematic circuit arrangement of an electronic ballast according to a fourth embodiment.
• the load circuit initially consists of a coil Ll and a capacitor Cl, which form a series resonant circuit, wherein the first terminal of the resonant capacitor Cl to the resonance coil Ll and the second terminal of the capacitor C 1 is connected to the ground potential.
• the first terminal of the resonance capacitor Cl is further connected via a series and / or parallel connection of a Lampenan- order 2 with the first terminal of a half-bridge capacitor C2 and the second terminal of the half-bridge capacitor C2 to the ground potential.
• the Vorschal tge advises invention is used to operate a lamp assembly with at least one low-pressure discharge lamp, which are each provided with two preheatable electrode coils for generating a gas discharge.
• the electric ballast is used to operate a single lamp LAl.
• Figure 1 shows the schematic circuit structure of this ballast.
• the lamp LA1 is connected between the first terminal of the resonance capacitor C1 and the first terminal of the bridge capacitor C2 in the load circuit.
• the electronic ballast has a transformer Tri designed as saturation-balancing choke with two windings 4a, 4b of the same number of turns and the opposite winding system.
• the windings 4a, 4b are connected in series with the lamp LA1, magnetically coupled to one another via a ferromagnetic core and flowed in opposite directions from the lamp current.
• the first winding 4a of the transformer Tri is connected in front of the lamp LAl and the second winding 4b of the transformer Tri after the lamp LAl in the load circuit of the half-bridge inverter, so that the transformer Tri works as a differential current transformer and the lamp currents in front of and behind the lamp LAl balanced.
• the transformer Tri designed as saturation-balancing choke adopts both the symmetry of the lamp current necessary for a uniformly bright illumination of the ends of the lamp LA1 and the limitation of the occurring voltages by a defined saturation of the ferromagnetic wound transformer core during a current in the Range of 5 - 50 niA, This only a small lamp currents are balanced, where the differences in brightness are greatest, and on the other hand avoided voltages that lead to premature ignition of the lamp during the preheat phase and thus to damage the lamp. Furthermore, voltages are prevented which lead to accidental ignition and thus to an accident risk of electric shock to the user.
• FIG. 2 shows a schematic representation of a circuit arrangement of an electronic ballast suitable for the operation of two lamp arrangements 2 connected in parallel, two current branches connected in parallel being connected to the first terminal of the resonance capacitor C1 and to the first terminal of a half-bridge capacitor C2, respectively Series switched lamps LA2, LA3 or LA4, LA5 are connected.
• a respective transformer Tr2, Tr3 is provided in each of the two current branches connected in parallel, a first winding 6a or 8a of the transformers being arranged upstream of the lamp arrangement 2 and a second winding 6b or 8b of the transformers downstream of the lamp arrangement 2 is.
• the windings 6a, 6b and 8a, 8b are each designed with opposite sense winding at the same number of turns and form a differential current transformer, which balances the lamp currents immediately before and behind the lamp assembly 2.
• the two transformers Tr2, T ⁇ 3 are formed as saturation-Symmetrier- chokes, which both the uniformly bright illumination of the series-connected lamps LA2, LA3 and LA4, LA5 necessary symmetrization of the lamp currents and the limitation of the voltages occurring by the assume defined set saturation of the ferromagnetic transformer core.
• the first windings 6a, 8a of the transformers Tr2, Tr3 are each preceded by a winding 10a, 10b of a balancing transformer Tr4, which does not operate in the saturation region.
• This also acts as a diluent current transformer and balances the partial currents in the parallel-connected current branches, so that the lamps LA2, LA3 in the first current branch shine as brightly as the lamps LA4, LA5 in the second branch, even in the case of severe dehusking.
• the electric ballast is used to operate two lamp assemblies 2 in parallel current branches.
• Figure 3 shows the schematic circuit structure of this ballast.
• a first winding 12a of the saturable balancing transformer Tr5 is arranged after the first lamp LA6 and a second winding 12b of this transformer Tr5 after the second lamp LA7, wherein the
• Lamps LA6, LA7 in the parallel-connected current branches in each case a winding 14a and 14b of a balancing transformer Tr6 is connected upstream (ie, a transformer that does not work in the saturation region).
• a winding 14a and 14b of a balancing transformer Tr6 is connected upstream (ie, a transformer that does not work in the saturation region).
• This works, as already explained, also as a differential current transformer and symmetrizes the partial currents in the parallel-connected current branches. This will ensure that everyone Lamps of Lampenanordnuiig shine brightly.
• the saturation-Symmetrier-choke Tr5 takes both necessary for a uniformly bright illumination of the lamps symmetrization of the lamp currents and the limitation of the voltages occurring by a defined set saturation of the ferromagnetic transformer core at a current in the range of 5 - 50 raA ,
• FIG. 4 likewise shows a schematic circuit arrangement of an electronic ballast suitable for the operation of two lamp arrangements 2 connected in parallel.
• This variant uses two parallel-connected current branches, which are each designed with a series resonant circuit consisting of a resonant capacitor Cl and a resonance coil Ll, wherein a lamp LA8, LA9 is connected to the first terminal of the resonant capacitors C1 and to the first terminal of a respective half-bridge capacitor C2.
• a first winding 16a of a saturable Symmetricr transformer Tr7 is arranged after the first lamp LAS and a second winding 16b of this transformer after the second lamp LA9.
• the saturation-balancing choke Tr7 assumes both the symmetry of the lamp currents necessary for uniformly bright illumination of the lamps L ⁇ 8, LA9 and the limitation of the occurring voltages by a defined saturation of the ferromagnetic core at a current in the range of 5 to 50 mA and the associated security against inadvertent ignition of the lamp. As a result, the safety regulations (thumb test) are observed and ensures a uniform lighting effect of the lamps.
• an electronic ballast for operating a lamp assembly having at least one lamp, in particular a low-pressure discharge lamp, and at least one transformer for balancing the lamp currents, wherein the transformer has two windings which are associated with one or more lamps of the lamp assembly.
• the transformer is designed as a saturation-symmetrizing throttle.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Circuit Arrangements For Discharge Lamps (AREA)
• Glass Compositions (AREA)
• Furan Compounds (AREA)
• Mechanical Treatment Of Semiconductor (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

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Family Applications (1)

Country Status (8)

Families Citing this family (8)

Family Cites Families (9)

• 2005
  • 2005-01-11 DE DE102005001326A patent/DE102005001326A1/de not_active Withdrawn
  • 2005-12-20 CA CA002594279A patent/CA2594279A1/fr not_active Abandoned
  • 2005-12-20 US US11/793,142 patent/US7675242B2/en not_active Expired - Fee Related
  • 2005-12-20 WO PCT/DE2005/002295 patent/WO2006074629A1/fr active Application Filing
  • 2005-12-20 EP EP05850186A patent/EP1836882B1/fr not_active Not-in-force
  • 2005-12-20 PL PL05850186T patent/PL1836882T3/pl unknown
  • 2005-12-20 CN CN2005800463873A patent/CN101099416B/zh not_active Expired - Fee Related
  • 2005-12-20 AT AT05850186T patent/ATE416598T1/de active
  • 2005-12-20 DE DE502005006178T patent/DE502005006178D1/de active Active

Non-Patent Citations (1)

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