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
  • H05B41/295—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 with preheating electrodes, e.g. for fluorescent lamps

Definitions

• the present invention relates to an electronic ballast for operating an electric lamp, which has a first and a second lamp filament, wherein the lamp filaments for heating during a preheating phase of the electric lamp with a heating circuit of the electronic ballast are electrically connected.
• the invention also relates to a method for operating an electric lamp with such an electronic ballast.
• Electric lamps are known in various designs and types. Thus, a variety of different ⁇ electronic ballasts are also known due to this diversity.
• An already known electric lamp is the amalgam fluorescent lamp.
• This has an advantage since ⁇ executed based on that in a wide temperature range of the luminous flux is about 90%.
• This positive effect of the A-malgam fluorescent lamps which can occur more or less depending on the structure of this lamp, can by a Heating circuit for heating the lamp filaments of this lamp in an operating phase are greatly reduced.
• This heating circuit is arranged in the electronic ballast with which the corresponding electric lamp is operated.
• the present invention is therefore based on the object to provide an electronic ballast, in which the negative influence of a heating circuit for heating lamp filaments of an electric lamp in the operating phase of the electric lamp can be at least reduced.
• it is an object of the ge ⁇ above named drawback with amalgam lamps at least to reduce.
• An inventive ballast for operating an electric lamp comprises a heating circuit which is designed for heating lamp filaments of the electric lamp during a preheating phase.
• the lamp filaments are electrically connected to the heating circuit.
• An essential idea of the invention is that the heating circuit is designed such that the heating current generated by this heating circuit in an operating phase of the electric lamp with a value between 20% and 60% of the lamp current of the electric lamp is dimensio ⁇ nable.
• the operating phase in time follows the heating phase before ⁇ and the ignition of the electric lamp.
• the electronic ballast according to the invention it is thus no longer necessary to completely switch off the heating circuit during the operating phase of the electric lamp and therefore it is no longer necessary to have to provide a complex circuit design for it.
• the heater circuit such ⁇ out is formed, that it comprises a stand Resonanzzu- in a preheating phase, which provides higher heating currents where ⁇ be reduced at the high heating currents in a phase of operation. The heating circuit then no longer has a resonance state in the operating phase.
• the heating current generated by the heating circuit in the operating phase of the electric lamp with a value between 33% and 53% of the lamp current of the electric lamp can be dimensioned.
• the adjustable in the operating phase value is between 37% and 48% of the lamp current of the electric lamp.
• the heating circuit has a first inductance as a lamp inductor and a first and a second additional inductance, wherein the first additional inductance inductance with a first end of the first lamp coil and the second additional inductance with a first end of the second lamp coil is electrically connected.
• the resonant circuit essentially has a resonance state in the case of operating conditions to be set in a preheating phase of the electric lamp.
• the resonant circuit has a different operating state from the preheating phase.
• the resonant circuit comprises a non-resonance state. This means that only in the preheating phase due to the goal of reaching there ⁇ th resonance state a maximum heating current can be supplied to the lamp filaments.
• the resonance circuit During the transition from the preheating phase into the operating phase, in which the operating frequency, which can be greater than 70 kHz in the preheating phase, is reduced to a lower value, then the resonance circuit also assumes an operating state which is far from the resonance state. As a result, the heating current delivered to the lamp filaments is significantly reduced.
• the operating conditions and the settings required for them during the preheating phase and the operating phase for a proper and safe operation are designated and included.
• the resonance circuit and thus the entire heating circuit is out of resonance and the influence on the luminous flux of the electric lamp at high temperatures in the operating phase can be significantly reduced, even prevented in the optimal case.
• the resonant circuit preferably comprises a heating inductor and a heating capacitor which are connected in series. It is preferred, when the Reso ⁇ nanzscnies formed so that the lamp filaments are each connected in a series circuit of a heating inductance and a heating capacitor between the two additional inductors and the respective ends. In a quasi-symmetrical configuration, a series circuit of a heating capacitor and a heating inductor are thus connected in each case at the first ends of the lamp filaments.
• the heater circuit may thus ef ⁇ Anlageniver manner in a preheating phase and in a loading ⁇ be tuned operating phase.
• the electric lamp is designed as an amalgam fluorescent lamp.
• 90% of the luminous flux over a wide temperature range can be optimally utilized and the negative influence of the heating circuit in the operating phase can be significantly reduced.
• a method according to the invention for operating an electric lamp with an electronic ballast which has a heating circuit for heating at least one lamp filament of the electric lamp is the heating of the heater circuit during an operating phase of the electric lamp to a value between 20% and 60% of the lamp current, the electric lamp is ⁇ .
• Advantageous embodiments of the electronic advantages are switching device, where transferable, also to be regarded as beneficial ⁇ embodiments of the method according to the invention.
• FIG. 1 shows an electronic ballast according to the invention
• Figure 2 is a representation of the luminous flux of an amalgam fluorescent lamp as a function of temperature.
• FIG. 1 shows an electronic ballast 1 according to the invention for operating an electric lamp 2, which in the exemplary embodiment is designed as an amalgam luminescent lamp.
• the electric lamp 2 has a first lamp filament 21 and a second lamp filament 22. Both the first lamp filament 21 and the second filament coil 22 each include a first end 21a and 22a and a second end 21b and 22b, respectively.
• the electronic ballast 1 has a heating circuit 3 for heating the two lamp filaments 21 and 22 during a preheating phase of the electric lamp 2.
• the heating circuit 3 is connected to both of th ers ⁇ lamp filament 21 and the second lamp filament
• the heating circuit 3 comprises a lamp inductor, which is formed as a first inductor 30 ⁇ .
• This inductor 30 is electrically connected to a first circuit node Sl.
• the heating circuit 3 comprises a first additional inductance 31a and a second additional inductance 31b. Is ⁇ nen as to erken, the first additional inductance 31a is also connected to the first circuit node Sl.
• the first additional inductance 31 a is connected in a circuit branch, which is electrically contacted with the first end 21 a of the first lamp filament 21.
• the second additional inductance 31b is connected to a second circuit node S2 and connected in a circuit branch, which is electrically contacted with the first end 22a of the second lamp filament 22.
• the resonant circuit 32a between the first additional inductance 31a and the first end 21a is connected to the first lamp filament 21st
• the resonant circuit 32 includes a heating inductance 321a and one in series as ⁇ to connected heating condenser 322a.
• a corresponding resonant circuit switches 32b ge ⁇ having also a heating inductance 321b and a heating capacitor 322b in a series circuit.
• the circuits 32a and 32b are to be considered as a single common resonant circuit.
• a resonant capacitor 4 is electrically contacted with the second end 21 b of the first lamp filament 21. Furthermore, a coupling capacitor 5 is electrically connected to the resonance capacitor 4 on the one hand and to the second circuit node S2 on the other hand. The voltage is supplied via the intermediate circuit voltage U zw .
• the general arrangement shown in Figure 1 is merely exemplary processing arrangement and may be configured in various ways to be able to achieve the reduction of the heating current in the operating phase, as compared to the Before ⁇ heating phase.
• the resonant circuits 32a and 32b especially the physi ⁇ -earth parameters of the components 321a, 322a and 321b, 322b to the effect designed such that in the preheating phase, the electric lamp is set to a resonance state and thus the heating circuit 3 is substantially in a resonant state. It can thereby be achieved that a very high heating current can be delivered to the two lamp filaments 21 and 22.
• the operating frequency is reduced, whereby the resonance nanzscen 32a and 32b leave the space occupied in the preheating phase resonance condition and in a significantly different from the resonance condition Radiozu ⁇ stood proceed.
• the tuning of the heating circuit 3 is changed such that in the operating phase, a significantly reduced current to the lamp filaments 21 and 22 is delivered.
• the heating circuit 3 is inventively designed such that operating phase during this Be ⁇ the heating produced by this heating circuit 3 Ström has a value which is in proportion between 20% and 60% of the lamp current of the electric lamp. 2 This value is preferably between 33% and 53% of the lamp current.
• Vorteilhaf ⁇ more advanced embodiment of this value can be between 37% and 48% of the lamp current, whereby, in each interval in each case a further improvement may be to the effect achieved is that a very high light output can be provided over a wide temperature range.
• FIG. 2 schematically illustrates the dependence of the luminous flux of the electric lamp 2, which is designed as an amalgam fluorescent lamp in the exemplary embodiment, as a function of the temperature.
• the luminous flux at relatively high temperatures in a design with a switched-off filament heating or disconnected heating circuit 3 (solid line) in the operating phase of the e lektrischen lamp 2 is substantially gleichver secured with a luminous flux curve According to the invention (dashed curve), in which during the operating phase of the electric see lamp 2, a reduction of the heating current to a corresponding fraction of the lamp current performed becomes.
• ren the invention provides a significant improvement in the light-current characteristic, particularly at high tempera ⁇ , can be achieved in comparison to a configuration in which during the operating phase of the electric lamp 2, filament heating and the heating circuit 3 is operated completely and thus virtually without reduced Schustromabgabe (dotted line).

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• Circuit Arrangements For Discharge Lamps (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=37594907

Family Applications (1)

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• 2005
  • 2005-10-17 DE DE102005049583A patent/DE102005049583A1/de not_active Withdrawn
• 2006
  • 2006-10-12 CN CN2006800384096A patent/CN101288346B/zh not_active Expired - Fee Related
  • 2006-10-12 KR KR1020087011758A patent/KR101313130B1/ko active IP Right Grant
  • 2006-10-12 US US12/083,574 patent/US7863830B2/en not_active Expired - Fee Related
  • 2006-10-12 EP EP06807224A patent/EP1938670B8/fr not_active Not-in-force
  • 2006-10-12 WO PCT/EP2006/067359 patent/WO2007045604A1/fr active Application Filing
  • 2006-10-12 AT AT06807224T patent/ATE520287T1/de active
  • 2006-10-12 CA CA002625335A patent/CA2625335A1/fr not_active Abandoned

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