WO2007087836A1

WO2007087836A1 - Ignition circuit for igniting a discharge lamp and method for igniting the discharge lamp

Info

Publication number: WO2007087836A1
Application number: PCT/EP2006/007469
Authority: WO
Inventors: Martin Honsberg-Riedl; Burkhard Ulrich; Alwin Veser
Original assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
Priority date: 2005-07-29
Filing date: 2006-07-27
Publication date: 2007-08-09
Also published as: CN101233791B; DE102005035745A1; CA2616573A1; CN101233791A; JP4910111B2; JP2009503773A; EP1911333A1; TW200715912A; KR20080036124A

Abstract

The invention specifies an ignition circuit for igniting at least one discharge lamp by applying an electrical ignition voltage pulse to the discharge lamp, wherein the ignition circuit has the following features: at least one source circuit for providing an electrical primary voltage pulse, at least one ignition circuit for providing the ignition voltage pulse and at least one inductive coupling element for inductively coupling the primary voltage pulse into the ignition circuit for producing the ignition voltage pulse. The ignition circuit is characterized by the fact that the inductive coupling element has a voltage transformation ratio which is selected from the range of 1/25 to 1/400. In addition, the invention also specifies a method for igniting a discharge lamp by applying an ignition voltage pulse using the ignition circuit according to one of the preceding claims having the following method steps: a) forming a resonant ignition circuit with a discharge lamp connected in parallel, b) producing the ignition voltage pulse in the resonant ignition circuit. The ignition circuit is used in particular for igniting VIP lamps, wherein the VIP lamps can be ignited again even in the operationally hot state at temperatures of from 500°C to 1000°C.

Description

description

Zundschaltung for igniting a discharge lamp and method for igniting the discharge lamp

The invention relates to a ignition circuit for igniting at least one discharge lamp by applying an electrical ignition pulse to the discharge lamp, the ignition circuit having the following features: At least one source circuit for providing an electrical voltage pulse, at least one ignition circuit for providing the ignition voltage pulse and at least one inductive coupling element for inductive coupling the Pnmarspannungspulses in the Zundkreis for generating the Zundspannungspulses. In addition to the ignition circuit, a method of igniting a discharge lamp using the ignition circuit is provided

A Zundschaltung of the type mentioned is in each case from EP 0 903 967 Al and EP 0 987 928 Al known. When igniting the

Discharge lamp, a gas is ionized in a lamp combustion chamber of the discharge lamp The gas consists for example of mercury vapor. The result is an electrically conductive plasma. This plasma causes a first illumination of the discharge lamp. In order to maintain this lighting and the rapid heating of internal electrodes of the lamp combustion chamber, the discharge lamp is driven, for example, with a sinusoidal alternating current (Zundubernahmest rom). A frequency of this alternating current is 200 kHz, for example. A Zundubernahmespannung of the discharge lamp at room temperature is, for example, 150 V to 500 V. After a Zundubernahmezeit in seconds range (less than a second to a few seconds), the actual operating current can be impressed. The operating current is sinusoidal or has a rectangular shape. A required operating voltage is, for example, 15 V to 225 V. From this phase (after 1 mm to 4 mm), the discharge lamp comes in the desired, highly heated operating condition with high internal pressure in the lamp combustion chamber, highest luminous efficiency and broadband emission spectrum.

For ignition, the internal electrodes of a lamp combustion chamber of the discharge lamp are driven by the ignition voltage pulse. It comes to an electrical flashover, which leads to the ionization of the gas. The ignition voltage pulse is a packet of a plurality of voltage pulses (voltage pulse train). A pulse repetition frequency of the voltage pulses within a voltage pulse train is 1 MHz to 10 MHz. In order to ignite the discharge lamp, ignition voltage pulses with a peak voltage in the kV range are required. The Zundspannungspulse are thus high-voltage pulse trains in the high frequency range (high-voltage RF burst). With this high-voltage pulse, the over-supply voltage is superimposed during the ignition process. The ignition circuit is configured in such a way that superimposition and thus ignition of the discharge lamp occur at maximum Zundubernahmespannung.

The known ignition circuit consists essentially of a source circuit, a Zundkreis in the form of a resonant circuit (Zundschwingkreis, secondary circuit) and an inductive coupling element in the form of a

Ignition transformer. The discharge lamp is electrically connected in parallel to the Zundschwingkreis. In the source circuit of the Pr imarspannungspuls is generated. With the help of Zundtrans formators the primary voltage pulse is coupled into the Zundschwingkreis. In the Zundschwingkreis the Zundspannungspuls arises. It comes to the ignition of the discharge lamp. The components of the ignition circuit, in particular the Zundt ransformator of the inductive coupling element are designed such that the highest possible quality Q αes Zundresonanzkreises results. The good Q is over 100. A Zundschaltung for igniting a discharge lamp is realized for example in a so-called electronic ballast (ECG). The electronic ballast converts an electrical energy from a available mains voltage so that the discharge lamp can be operated in its optimum voltage, current and frequency range. The discharge lamp is, for example, a high-pressure lamp or high-pressure lamp used as a video and projection lamp (VIP lamp).

At a relatively low lamp temperature (e.g., room temperature, about 20 ° C), a peak voltage of the ignition pulse of a few hundred to a few thousand volts suffices to initiate electrical flashover between the internal electrodes of the lamp. The higher the

Lamp temperature is, the higher is the necessary for the ignition of the high and high pressure lamp peak voltage. In a VIP lamp usually operating temperatures of 950 ° C to 1050 ° C occur. The necessary for the electrical flashover between the internal electrodes ignition voltage is extremely high at these temperatures, since the gas acts in the lamp combustion chamber due to a prevailing gas pressure electrically highly insulating. This causes the VIP lamp to cool down before it can be re-ignited. The temperature of the combustion chamber must sink at today's ballasts to about 500 ° C. Starting from a burner operating temperature of the VIP lamp of about 1000 ° C, cooling to 500 ° C takes about 30 seconds. Within the cooling time of 30 seconds, re-ignition (hot re-ignition) of the VIP lamp fails without any additional measures.

Object of the present invention is to provide an electrical Zundschaitung that is capable of Ent a charge even in the Abkuhlzeit of the lamp to ignite. To solve the problem v: Zundschaltung for igniting at least one discharge lamp by applying an electrical Zundspannungspulses indicated to the discharge lamp, the Zundschaltung the following features aufv / eist: at least one source circuit for providing an electrical Pπmarspannungspulses, at least one Zundkreis for providing the Zündspannungspulses and at least one inductive coupling element for inductive coupling of the primary voltage pulse in the Zundkreis for generating the Zundspannungspulses. The ignition circuit is characterized in that the inductive coupling element has a transmission ratio of a voltage ratio selected from the range of 1/25 to 1/400 inclusive. Preferably, the gear ratio is selected in the range of 1/40 to and including 1/200, and more preferably in the range of 1/40 to 1/70 inclusive.

To solve the problem, a method for igniting a discharge lamp by applying a Zundspannungspulses using the ignition circuit according to one of the preceding claims with the following method steps: a) forming the Zundschwingkreises with parallel connected discharge lamp and b) generating the Zundspannungspulses in the Zundschwingkreis.

The discharge lamp or the inner electrodes of the discharge lamp are connected to the Zundschwingkreis together with other components. The Zundkreis has all the necessary reactive components. Due to the high transmission ratio and the resonant voltage excitation, which occurs either in the Zundkreis or in the coupling element, a Hochf feenz-Zundpuls is generated with a very high Scheltelspannung in the Zundkreis. Preferably, a Zundspannungspuls with a peak voltage of 10 kV inclusive up to and including 50 kV and produced in particular with a peak voltage of 15 kV inclusive up to and including 25 kV.

A high-frequency voltage pulse with a pulse repetition frequency in the MHz range is generated. In a preferred embodiment, a Zundspannungspuls is generated with a pulse repetition frequency of 0.5 MHz inclusive up to and including 30 MHz and in particular from 0.9 MHz to 10 MHz inclusive. Particularly good results were achieved, for example, with the pulse repetition frequency of 1.5 MHz.

With this pulse repetition frequency and the high voltages, the Zundpulsdauer the Zundspannungspulses can be kept short. The ignition pulse duration is less than 50 μs. In a particular embodiment, a Zundspannungspuls is generated with a Zundpulsdauer from the range of 5 μs inclusive including up to 30 μs. In particular, ignition pulse durations of less than 20 μs are possible. These relatively short Zundspannungspulse sufficient to even at high temperatures of the discharge lamp due to the high

Translation ratio to enable the ignition of the discharge lamp.

By zundig Zundwiederholungen let the

Increase probability of likelihood. Therefore, according to another embodiment, the ignition pulse pulse is generated at a repetition frequency (repetition rate) in the range of 50 Hz to 10 kHz inclusive, and more particularly in the range of 100 Hz to 1 kHz inclusive. With the repetition frequency a Zundspannungspuls is coupled into the Zundkreis. With a relatively high repetition rate, for example, 1 kHz, it increases the likelihood of the ignition succeeding within a certain time interval.

The inductive coupling element v / e at least one Zundt ransforrra tor on. The Zundt rans forma gate has a Primary inductance with at least one primary winding on and a secondary inductance with at least one secondary winding. The secondary inductance of the ignition transformer is part of the Zundkreises. The Zundkreis can be configured as a Zundschwingkreis. With

Help of the ignition transformer. the primary voltage pulse formed in the source circuit is coupled into the Zundschwingkreis. Preferably, the ignition transformer is an HF-HV transformer having a ferromagnetic core (e.g., ferrite or iron powder core). The HF-HV transformer is designed so that it alone ensures the high voltage conversion. For example, the HF-HV transformer is a transformer with 25 kV output voltage. With a Zundtransformator configured in this way, a significantly poorer quality of the Zundschwingkreises can be accepted. The Zundschwingkreis has a good Q of less than 100.

The inductive coupling element alone may have the appropriately designed ignition transformer. In a particular embodiment, the inductive coupling element has at least one coupling transformer. The ignition transformer and the coupling transformer are electrically connected together in such a way that together they form the inductive coupling element. Dar Zundtrans formator and the coupling transformer are connected in series in a particular embodiment. The primary inductance of the coupling transformer may be part of the source circuit. The secondary inductance of the coupling capacitor and the primary inductance of the ignition transformer are electrically connected. The secondary inductance of the ignition transformer is in turn part of the Zundresonanzkreises.

The coupling transformer is used for voltage adjustment. This leads to the fact that the high transmission ratio of the inductive coupling element is provided by the ignition transformer together with the coupling trans fomator. The gear ratio is not the Zundtrans formator rested alone. This results in a smaller contribution of the ignition transformer. This leads to the fact that the secondary inductance and thus the secondary winding of the ignition transformer can be kept small. This has the following special advantages: The ohmic resistance of the secondary winding is reduced by a low number of turns and thus by a shorter wire length. The ohmic resistance is also flowed through vorp operating current of the discharge lamp and therefore leads to a continuous power loss to be avoided. In addition, the leads

Coupling transformer for further decoupling of the Zundschwingkreises and the source circuit. This facilitates a resonant voltage excitation in the Zündschwingkreis necessary for the formation of the Zundspannungspulses.

With the combination of ignition transformer and coupling transformer shown, ignition voltage pulses with a Scheltel voltage of more than 30 kV can be achieved with a favorable design of the further components of the ignition circuit. In other words, this is the voltage which, from the positive maximum to the negative maximum, is 60 kVpp (in the Anglican 60 kVpp) (assuming that in the present case the voltage is approximately sinusoidal).

In a particular embodiment, the inductive

Coupling element on at least one coupling resonant circuit. With the coupling resonant circuit, a coupling transformer may be unnecessary. Preferably, however, a coupling transformer is present and the coupling resonant circuit electrically connects the ignition transformer and the coupling transformer with each other. The coupling resonant circuit is also referred to as Tankresonanzkreis. It is inserted between the coupling transformer and the Zundtransformator such that it takes over the resonance of the secondary winding of the Zundt ransforrnators. In the coupling resonant circuit there is a resonant voltage excitation, which is triggered by the primary voltage pulse of the source circuit. In contrast, the Zundkreis is not as Zundschwingkreis designed. Here there is no resonant voltage overshoot. About the ignition transformer, only a Zundspannungspuls is generated at the inner electrodes of the discharge lamp. Even in this particular embodiment, the ignition transformer does not only supply the transmission ratio of the entire inductive coupling element. The height of the gear ratio depends very much on the design of the tank rice, which acts either by suitable capacitive or inductive tap itself transforming or additionally by upstream of a coupling transformer by its contribution. For example, the tank resonance circuit develops a voltage of 2 kV to 10 kV. Thus, a moderate ratio for the Zundtransformator is possible Depending on the source circuit type can be dispensed with the coupling transformer.

The source circuit has a suitable high frequency switching element. The high-frequency switching element has one or more high-frequency switching transistors. The high-frequency switching transistor is a (power) MOS transistor and in particular a CoolMOSΘ transistor or powerMESH ^πM 'transistor or FDmesh ^(TM) transistor or a silicon carbide FET transistor.

The source circuit provides high power for the pulse duration. The source circuit is designed such that an average primary power zv / ischen 300 W and 2 kW. This leads to a high-frequency switching transistor used for switching current pulses with a Scheltelstrom zv / ischen 10 A and 100 A leads. It is ensured that an efficiency is sufficiently high. A price for a high-frequency switching transistor depends very much on its St romtragfahigkeit. The higher the efficiency of the source circuit, the lower the static transmission capability for the high-frequency switching transistor (s) can be selected. In a special embodiment, the source circuit for providing the primary voltage pulse on a high-frequency switching element with switching relief. This generally means that at the instant of switching element switching on, the applied voltage and current are equal to or near zero. In this way, a loss Leistungsspit ze can be avoided, which usually occurs during the switching process. This results in a source circuit with a particularly high efficiency. Another important advantage of switching relieving is the avoidance of strong electromagnetic Storanteile (EMC problem) in the spectrum at and far above the switching frequency.

The source circuit preferably has a topology selected from the group E, the class D or the class DE. The class E and the class DE are characterized by a particularly good switching discharge. Due to the high switching discharge, an electrolytic capacitor, which is usually required as a supply buffer for the source circuit, be kept small Moreover, only a high-frequency switching transistor is required for this switching stage, which must have only a limited Stromtragfahigkei t due to the increased efficiency. This results in a relatively cheap ignition circuit. Another advantage is that an output voltage of the switching stage follows without further tuning almost linearly a DC voltage with which the switching stage is supplied. This allows regulation of the high-frequency voltage via an upstream power supply of the source circuit.

There are two types of class E: On drain bzv /. Collector terminal of the transistor may be connected to a parallel circuit or a series circuit. The second solution is characterized by being very small

Supply voltages can be operated. It is thus possible to fan out a ilocπst lomt ransistor with relatively low blocking! ^■ to use it. Very good switching relief is also achieved with a Hocnf requenz scnal t level of the DE class. This class is based on a half bridge of two switching transistors. The switching transistors used require a significantly lower dielectric strength than the switching transistor, which comes in the class E used.

Zundschaltung is used in particular in ECGs for high-pressure discharge lamps and for high-pressure discharge lamps (ultra-high-pressure discharge lamps) as they are used in the video and Pro] ektions-Technik. In a high-pressure discharge lamp, pressures of 2 bar to 20 bar occur in the lamp combustion chamber. For ultrahigh-pressure lamps, the pressures range from 100 bar to 200 bar.

The aim is to achieve the broadest possible emission spectrum. A power of the VIP lamps is between 100 W and 300 W, for example 120 W. Higher and lower powers are also conceivable. With the ignition circuit such discharge lamps can v / ground during operation hot state at temperatures of above 500 ° C toward ignited to 1000 ⁰ C to.

In summary, the invention provides the following essential advantages:

With the ignition circuit is achieved that a discharge lamp can be ignited even at high temperatures of about 500 ⁰ C. If there is an interruption in the lighting of the discharge lamp, cooling is not necessary for a renewed ignition. There is no break

With the invention it is possible to dispense with a magnetic field which is often used to maintain the usual Zundpause today. On the basis of several exemplary embodiments and the associated figures, the invention will be explained in more detail below.

Figures 1, 2, 3A and 3B show circuit diagrams of various exemplary embodiments of

Ignition switch.

FIG. 4 shows the circuit diagram of a high-frequency switching stage of the class DE.

The ignition circuit 1 for igniting a discharge lamp 2 by applying an electrical ignition pulse is implemented in an electronic ballast for a high-pressure discharge lamp 2. The high-pressure discharge lamp 2 is a VI P discharge lamp with a power of 120 W. In alternative embodiments, the VIP discharge lamp has a power of 100 W or 300 W.

The essential components of the ignition circuit 1 are the source circuit 11 for providing the

Primarspannungspulses, the ignition circuit 12 for providing the Zundspannungspulses and the inductive coupling element 13 for inductive coupling of the primary voltage pulse in the Zundkreis 12. By coupling the primary voltage pulse in the Zuαdkreis 12 of the Zundspannungspuls.

The internal electrodes 22 of the high-pressure discharge lamp 2 arranged in the lamp combustion chamber 21 are components of the ignition circuit 12. The ignition voltage pulse generated in the ignition circuit 12 causes an electrical flashover between the internal electrodes 22. The gas inside the lamp combustion chamber 21 is ionized. It forms the heating plasma for Zundubernahme.

To maintain the Aufheizpiasmas the Hochdruckent charge la ^r npe 2 is about the

Power supply unit 122 is driven with a sinusoidal pickup voltage. The Power supply unit 122, which is integrated in the ECG, provides a sinusoidal pickup voltage between 150 V and 500 V in the 100 kHz range.

The source circuit 11 is connected via the

Power supply unit 111 supplied with a suitable electrical DC voltage. The source circuit 11 has a high-frequency switching element 112. The high-frequency switching element 112 is de-energized. This means that at the moment of switch-on, the applied voltage and the conducted current are 0 or close to 0. Components of the high-frequency switching element 112 are at least one high-frequency switching transistor 113 and at least one HF driver circuit 114. The high-frequency switching transistor 113 is driven by the HF driver circuit 114. The high-frequency switching transistor 113 is a CoolMOSΘ Transis tor. In this alternative embodiments, a PowerMESH ⁽ "'' transistor, a FDmesh ^(TM) - transistor or a silicon carbide FET transistor is used, the RF driver circuit 114 supplies a high-frequency switching signal for the high-frequency switching transistor 113 on. the pulse repetition frequency to be achieved

Zundspannungspulses is adjusted. This means that in the source circuit 11, a primary voltage pulse is generated, which has a same or very similar pulse repetition frequency as the Zundspannungspuls in the ignition circuit 12th

With the aid of the ignition device 1, a high-frequency ignition voltage pulse for igniting the discharge lamp 2 is generated. A pulse follower frequency of the Zundspannungspulses is in a first embodiment about 1.5 MHz. According to a further embodiment, the pulse repetition frequency is 4 MHz. The peak voltage of the Zundspannungspulses amounts to 22 kV. This corresponds to 44 kVss (44 k.Vpp). According to another embodiment, the track voltage of the bus is

Ignition voltage pulse 30 kV (60 kVss). The ignition pulse duration is 20 μs. According to another embodiment, the ignition pulse duration is 5 μs. The inductive coupling element 13 has a

Gear ratio αer voltage translation of about 1/60. By this high Uoerset tion ratio, it is possible, the high-frequency Spannuπgspulse with the high

To achieve Scheltelspannung, Due to the high Scheltelspannung it is πoglich, the VIP high-pressure discharge lamp at high

Brennerober flat temperatures of over 500 ⁰ C to ignite. The Abkuhlphase must not be waited for successful Wiederzunden the discharge lamp.

To obtain the high gear ratio, three examples are given below:

Example 1 :

The associated circuit diagram is shown in FIG. The inductive coupling element 13 consists only of a Zundtransformator 131. The Zundtransformator 131 provides all the high transmission ratio. A primary inductor 171 of the ignition transformer 131 is a component of the optical switch 11. The secondary inductance 1312 of the ignition transformer 131 is a component of the ignition circuit 12, which is designed as a resonant circuit 121. About the Primal im juntivitat 1311 and the

Secondary inductance 1312 of the ignition transformer 131, the primary voltage pulse in αen Zundschwingkreis 121 is coupled.

The ignition transformer 131 is an HF-HV transformer with a ferromagnetic remote and corresponding turns numbers of the primary inductor 1311 and the secondary inductor 1312. The resonant circuit 121 has a good Q of v / eit below 100.

The secondary function 1312 consists of two almost identical partial inductances with the same winding sense. This Tei 1 Indukt ivi tate ^r with other ingredients to a nearly symmetrical Zundschwingkreis 121 joined together. This allows the supply of the operating voltage and the Zundubernahmespannung without being affected by the high voltage pulses of the ignition.

The high-frequency switching element 112 of the source circuit 11 has a high-frequency switching stage of the class E (series topology).

Example 2:

The corresponding circuit diagram is shown in FIG. In contrast to Example 1, the inductive coupling element 13 in addition to the ignition transformer 131 a coupling trans-formers 132 on. The high transmission ratio is achieved by coupling the ignition transformer 131 to the coupling transformer 132. For this purpose, a primary inductance 1321 of the coupling capacitor 132 is part of the source circuit 11. The primary voltage pulse is generated indirectly via the secondary inductance 1322 of FIG

Coupling transformer 132 and the primary inductance 1311 of Zundtrans formator 131 coupled into the Zundschwingkreis 121. By a corresponding embodiment of the coupling transformer 132 v / ird partial translation ratio achieved. The partial transfer ratio of the

Zundtrans formators 131 can thus be reduced. The high transmission ratio of the entire inductive coupling element 13 is maintained.

The high frequency switching element 112 of the source circuit 11 also has a high frequency switching stage of class E, but with parallel topology.

Example 3:

The associated circuit diagram is indicated by FIGS. 3A and 3B. The ignition circuit 12 is not configured as a Zundschwingkreis. This means that the Zundkreis 12, apart parasitic Elenenten, can not be excited to oscillations in the frequency range of Zundspannungspulses.

For inductive generate the Zundspannungspulses in the ignition circuit 12, the inductive coupling element 13 a

Tank resonant circuit (coupling resonant circuit) 133 on. The tank resonant circuit 133 has a capacitive divider (FIG. 3A). Alternatively, the tank resonant circuit 133 is configured as a tank resonant circuit with a tapped coil (tapped Tankresonanzkreis, Figure 3B). This

Tank resonant circuit 133 is connected in a further development of the coupling element 13 according to the preceding example between the coupling transformer 132 and the ignition transformer 131. The primate induts ivitat 1311 of the Zundtransformatoi s is part of the Tankresonanzkreises 133. Again, a Tei 1 translation ratio is taken over by the tank resonant circuit. Thus, the ignition transformer 131 can manage with a smaller transmission ratio.

In addition to the examples described, there are still a variety of Ausfuhrungs forms, which result from corresponding embodiments of the source circuit 11, the ignition circuit 12 or the coupling element 13 and its components. Thus, the »secondary inductance 1312 of the ignition transformer 131 according to an embodiment not shown in one piece. More than two components are also conceivable. In a further embodiment, a high-frequency switching element 112 with a switching stage of the DE class is used for the source circuit 11 as an alternative to the high-frequency switching element 112 with the switching stage of the E-class. A DE scarf ts tufe with Ser lenkreis topology is indicated in Figure 4. The high-frequency switching stage of this class has two high-frequency switching transistors 113. Each of the high frequency switching transistors can be driven by its own RF transmitter circuit 114.

Claims

claims

1. Zundschaltung (1) for igniting at least one discharge lamp (2) by applying an electrical Zundspannungspulses to the discharge lamp, the Zundschaltung comprising the following features: at least one Quellenscnaltung (11) for providing a Pπmarspannungspulses electrical, at least one Zundkreis (12) for providing the Zundspannungspulses and at least one inductive coupling element (13) for inductive coupling of the primary voltage pulse in the Zundkreis for generating the Zundspannungspulses, characterized in that - the inductive coupling element has a transmission ratio of a Spannungsusetzung selected from the range of 1/25 to 1/400 is.

2. Zundschaltung according to claim 1, wherein the transmission ratio from the range of 1/40 to

1/200 and in particular from the range of 1/40 to 1/70 is selected

3. Zundschaltung according to claim 1 or 2, v / obei the inductive coupling element at least one

Zundtransformator (131).

The ignition circuit of claim 3, wherein the ignition transformer is an RF-HV transformer having a ferromagnetic core.

5. ignition circuit according to one of claims 1 to 4, wherein the Zundl ^ rice has a Z jndschwiπgkreis having a good of less than 100.

6 ignition circuit according to one of claims 1 to 5, wherein the inductive coupling element at least one coupling t rans formator (132)

7. ignition circuit according to one of claims 1 to 6, wherein the inductive coupling element has at least one coupling resonant circuit (133).

8. Zundschaltung according to claim 7, wherein the coupling resonant circuit (133) electrically connects the Zund transformer and the coupling transformer with each other.

The ignition circuit according to any one of claims 1 to 8, wherein the source circuit for generating the primary voltage pulse comprises a high frequency switching element (112) with switching discharge.

10. The ignition circuit according to claim 1, wherein the source circuit has a topology selected from the group of class E, class D and class DE.

11. A method of igniting a discharge lamp by applying a Zundspannungspulses using the

Ignition circuit according to one of claims 1 to 10 with the following method steps: a) forming the Zundschwingkreises with parallel connected

Ent Ladungslarnpe and b) generating the Zundspannungspulses in the Zundschwingkreis.

12. The method of claim 11, v / obei a Zundspannungspuls is generated with a Scheltelspannung of 10 kV to 50 kV and in particular with a peak voltage of 15 kV to 25 kV.

13. The method according to claim 11 or 12, wherein a Zundspannungspuls with a pulse repetition frequency of 0.5 MHz to 30 MHz and in particular from 0.9 MHz to 10 MHz generated v /.

14. The method according to any one of claims 11 to 13, wherein a Zundspannungspuls is generated with a Zundpulsdauer from the range of including 5 microseconds to 30 microseconds.

15. The method according to any one of claims 11 to 14, wherein generating the Zundspannungspulses is repeated with a repetition frequency in the range of 50 Hz to 10 kHz and in particular from the range of 100 Hz to 1 kHz.

16. The method according to any one of claims 11 to 15, wherein the ignition is performed at a lamp temperature of the discharge lamp of about 500 ° C.

17. The method according to any one of claims 11 to 16, wherein the discharge lamp used is a high-pressure discharge lamp and in particular an ultra-high-pressure discharge lamp.