DE2009023A1 - Circuit arrangement for igniting a discharge lamp - Google Patents

Description

Patonianwälie

Dr.-Ing. Wilhelm Reichel
Dipl-Ing. VJoIfäang Reichel

6 Frankiuri a. M. 1

Parkslrasse 13 _6ig6

NEW NIPPON ELECTRIC COMPANY LTD., Osaka, Japan

Circuit arrangement for igniting a discharge lamp

The invention relates to a circuit arrangement. Ignition of a discharge lamp, with a first (closed) circuit that contains a voltage source, a coil and the discharge lamp connected in series- .. contains, and with a second (closed) circuit.

In a known circuit arrangement of this type wfrcl part of the coil for generating a pulse voltage used that of the output voltage of the voltage source superimposed and used to ignite the discharge lamp ": will. With this arrangement, however, it is difficult to generate the pulse voltage because the iron core of the Coil becomes saturated when current is passed through the main winding of the coil to preheat a lamp electrode will. Therefore, an electrode preheating transformer is required so that the entire arrangement is proportionate becomes expensive. Furthermore, it is difficult to interrupt the pulse voltage after the ignition of the discharge lamp. This adversely affects the life of the discharge lamp and also causes S-noise fed into the power supply circuit.

009837/1523

BATH ORIGINAL

The invention is therefore based on the object, i.e. the above-mentioned and other disadvantages compared to the known Avoid state of the art.

According to the invention, this object is achieved in that the second circuit is a semiconductor switching element, contains a capacitor and an inductive component, that the switching element and the inductive component in Series connected in parallel to the lamp and the capacitor is also parallel to the lamp and the When the lamp is ignited, it has a characteristic core voltage has that the switching element has a conductivity triggering voltage which is higher than c »e;,. Tube voltage is that the capacitor and the uiv.uk tive component form a resonant circuit, the e ^ ic- oscillating Voltage generated by the lamp; ? u; ■ _ · - The result is that the lamp has electrodes that j-veil between the capacitor and the voltage source lieger, so that the voltage source connects the capacitor via this Electrodes are charged and the electrodes are heated so that the switching element is conductive when the Capacitor is charged to a voltage equal to the conductivity trigger voltage, whereupon the oscillating circuit generates the oscillating voltage " and that the ■ discharge lamp by heating the electrodes and the oscillating voltage is ignited and the tube voltage of the lamp prevents the switching element becomes conductive.

The semiconductor switching element is a voltage-dependent switching element, e.g. a thyristor.

Developments of the invention are set out in subclaims. marked.

009837/1523

BAD OBtGlNAL

The invention and its developments are described in more detail below with reference to drawings in which preferred exemplary embodiments are shown.

Figures 1 (A) to (B) represent circuit diagrams and

Fig. 1 (C) is a signal diagram for Er

clarification of the mode of operation of an arrangement according to the invention.

Figures 2 (A) to (D) represent circuit diagrams and signal diagrams according to the invention.

Figures 3 and 4 illustrate diagrams of a

another embodiment of Fig. 2 (A) to (D).

Figures 5 (A) to 5 (D) illustrate a circuit diagram and Si

is a block diagram of another embodiment of the arrangement of Fig. 1 (A).

Fig. 6 illustrates a modification of the off

management example according to Fig. 5 (~, -dar.

FIG. 7 illustrates in a circuit diagram of a

their modification of the embodiment according to Fig. 1 (A) represent.

The Fig. 8 (A) shows a modification of the

Embodiment according to Fig. 2 (C) and
Fig. 8 (B) shows the time course of the

Tube voltage of the discharge lamp according to Fig. 8 (A).

009837/1523

Figures 9 to .11 represent further circuit diagrams.

Embodiments according to the invention with an improved Preheating circuit.

Figures 5 to 20 are circuit diagrams of further

Embodiments of the arrangement according to the invention for igniting and operating several parallel-connected discharge lamps and

Fig. 21 is a circuit diagram of a

P exemplary embodiment for Be

drove several lamps connected in series.

In the embodiment of Fig. 1 (A), an AC power source 1, a choke coil 2 and a Discharge lamp 3 with electrodes 4 and 5 connected in series. Furthermore, there is an ignition circuit in parallel with the discharge lamp 3 6 with a capacitor 7, an inductor 8 and a thyristor 9.

Fig. 1 (B) shows another embodiment in which the ignition circuit 6 · a high frequency transformer 10 with a primary winding 11 and a secondary winding

12 contains. * In this embodiment, a bidirectional component (e.g. a symmetrical silicon switch) used as a thyristor switching element, which is switched on or switched on at a voltage, ignited or becomes conductive, which is lower than the output voltage of the voltage source and higher than a characteristic The tube voltage of the discharge lamp, which is the operating voltage. Instead of this component a unidirectional component can also be used will.

009837/1523

The electrode preheat ignition circuit is designed in such a way that c,. they in relation to the frequency of the output voltage of the Voltage source 1 through the capacitor 7 has a high impedance if the thyristor switching element 9 is not ■■: - is conductive, or, has a low impedance, if the switching element 9 is conductive, namely when the Capacitor 7 is in its short-circuiting state.

The operation of this circuit is shown below described in more detail. When the output voltage of the alternating voltage 1 is fed to this circuit, the capacitor 7 is not charged at the beginning of each half cycle. In this state the impedance of the capacitor is zero. Accordingly, a small current flows in one closed circuit, the components 1,2,4,7 and 5 contains. As a result, the electrodes 4 and 5 of the discharge lamp 3 is slightly heated, the Capacitor 7 begins to charge. When the voltage across the capacitor 7 at time t ^ a predetermined value reached, the thyristor switching element 9 is switched on, so that the capacitor 7 is via the (closed) Circuit with components 7, 8 and 9 discharges. As a result, the discharge lamp 3 becomes an oscillating one Voltage supplied. At this moment it is that Thyristor switching element 9 not possible to maintain its holding current, so that it is switched off or locked or opened.

These processes are repeated several times, so that an oscillating voltage is repeatedly generated. He ^; the instantaneous value of the current increases gradually. Therefore, if the thyristor switching element 9 ignites at time tp and the holding current is not exceeded, it remains conductive, so that the oscillating voltage is interrupted and the heating current of the electrodes 4 and ν!? rises to the normal abnormal value. ■

009837/1523

These processes are repeated in every half-wave of the alternating supply voltage (1), so that the electrodes U \ c are sufficiently heated and the discharge lamp 3 zjk. Shine is brought.

When the discharge lamp 3 is lit, the semiconductor switching element do not remain conductive because the conductivity ignition voltage of the switching element 9 is higher than is the running voltage of the discharge lamp 3. Therefore, the oscillating voltage generating circuit is interrupted the oscillating voltage is generated automatically. In this state, the circuit 6 has a high Impedance versus frequency of the output voltage of the voltage source 1. This means that the current consumption (More precisely, the energy consumption) is reduced and the electrodes 4 and 5 of the discharge lamp 3 at all times operated normally.

In other words, the arrangement is operated in such a way that the semiconductor switching element 9 is switched into the conductive state by the voltage on the capacitor 7, the capacitor 7 discharges quickly via the branch 8, 9 and the circuit 6 represents a parallel resonant circuit which the discharge lamp ignites. While the vibration state have the current flowing in the capacitor 7 current i and through the albleiter ^a switching element 9 flowing

Current i “the continuous shown in Fig. 1 (C) Waveforms. In the arrangement according to FIG. 1 (B), that in the primary winding 11 of the high-frequency transformer 10 induced oscillating voltage is stepped up by the secondary winding 12 and fed to the lamp 3.

The arrangement of FIG. 2 (A) is particularly suitable for a discharge lamp whose emissivity has decreased (i.e. at the end of the lamp's life) or its

009837/1523

Mercury vapor pressure has decreased because it was in oi. cold environment is used, or their Elektroclenheizfaden is almost broken because the discha;. czUndspannung due to an error in the Entladur ^> - lamp, for example, a leak has been greatly exaggerated. With such a discharge lamp it is inevitable that ιλο * allows a strong current (eg more than 3 amps for a 20 watt lamp) to continue flowing. This creates strong dielectric losses in the capacitor. This means that a high frequency capacitor with a small tangcf must be used in this arrangement. Furthermore, the diameter of the winding of the high-frequency coil must be large enough to be able to absorb this strong current. Ai '^. H the material used for the magnetic core is proportional. nism moderately expensive if it is only supposed to have low frequency losses. In addition, the semiconductor switching element must be designed for a high rated current.

The arrangement of Fig. 2 (A) also represents a verb ^ caerur ^ · with regard to the discoloration of the discharge lamp, ei », caused by the application of the high frequency voltage by the ignition circuit, and in terms of the service life of the lamp, which is otherwise reduced by keeping the high voltage longer than about 100 periods is applied to ignite the lamp, the power supply switch has been closed.

The arrangement according to FIG. 2 (A) is characterized in that the oscillation is interrupted at an arbitrary point before K / 2 in each half-cycle of the alternating supply voltage (the output voltage of the Weoh> eU voltage source). The principle of interrupting the oscillation into an arbitrary point is described in more detail with reference to FIG. 2 (A). A magnetic core T is provided with two windings L ^ and L ₂ , of which the winding L ₁ has one

009837/1523

Low-frequency impedance ZL is connected to a low- _{frequency voltage source EL and the winding L 2 is} connected to a high-frequency voltage source EH via a high-frequency impedance ZH. In this circuit, it is assumed that the high frequency voltage is kept constant and the low frequency voltage is used as a kind of bias voltage. Then, as can be seen from Fig. 2 (B), the flux density B in the magnetic core T is largely changed _{by the low frequency current I 1} during the period a'-b'-c ^1. The magnetic core is saturated at point c '. During the period c'-d ¹ , the flux density B is almost constant. It is therefore possible to make the circuit oscillate only during the periods a'-c 'and d'-f of the low- _{frequency current I 1} , a high-frequency voltage being obtained and the oscillation during the periods c'-d ¹ and f'-a 'can be interrupted. Similarly, oscillation is generated during periods a "-c" and d ^M -f ^{M of} a larger low-frequency _{current I 2} , a high-frequency voltage being obtained and oscillation being interrupted ^{during periods c "-d" and f "-a n} (Specifically, the BH curve changes depending on the low-frequency current, but only a BH curve is shown in order to simplify the illustration in Fig. 2 (B)).

In operating this arrangement, the low frequency current is changed. Instead, the high-frequency current can also be changed. If the current is kept constant , a magnetic core with a different hysteresis characteristic can also be used.

Fig. 2 (C) illustrates an embodiment in which an AC voltage source 1 usual frequency, a reactor 2 and a discharge lamp 3 with electrodes A and are connected in series and an ignition circuit 6 is provided, a capacitor 7 having a high resistance

009837/1523

stood at the usual frequency and a semiconductor switching element 9 contains, which can be actuated by the voltage on the K ... capacitor 7. This arrangement under rope «^ u ^« differs from that of FIG. 1 in that it is a high frequency coil 14 is used with a tap at which the ignition voltage for the lamp is tapped.

If, in the arrangement according to FIG. 2 (C), the AC voltage source is switched on, the capacitor 7 is charged via the part 15 of the high-frequency coil 14 and the semiconductor switching element 9 is conductive depending on the voltage on the capacitor 7. Thereupon discharges the capacitor 7 rapidly via the coil 14, the capacitor 7 and the coil 14 forming an oscillating circuit, which generates a high frequency voltage. The direction of the current flowing through part 15 of coil 14 is during the charging process opposite to the direction of current flow during the discharge process. The magnetic core of the high frequency coil 14 is therefore driven by the low frequency current excited, which corresponds to the difference between these two oppositely directed currents. Therefore, if the core is saturated at any point before 7Γ / 2 of each half cycle of the AC supply voltage, changes the flux density in the high-frequency coil 14 no longer increases, so that the oscillation is interrupted. Consequently the current i_, which flows in the capacitor 7, equal to zero, while the current i ″ flowing through the semiconductor switching element 9 becomes a low-frequency current and this state remains until the end of the half-wool. In every half-wave of the alternating supply voltage repeat these processes several times, so that the discharge lamp 3 is supplied with an intermittently oscillating voltage as shown in Fig. 2 (D). if the electrodes 4 and 5 are sufficiently heated, the discharge lamp 3 begins to light up. When the discharge lamp 3 lights up, the semiconductor switching element 9

009837/1523

no longer maintain their conducting state, so that the oscillation is interrupted exactly as desired. In this way, the discharge lamp 3 does not become influenced in an undesirable manner.

In the arrangement according to FIG. 3, a capacitor 17 with a low capacitance is connected in parallel to the high-frequency coil 8 & I-connected. Therefore, part of the discharge current flows from the capacitor 7 via the capacitor 17. This current is phase shifted by 180 ° with respect to the current flowing through the high-frequency coil 8. As a result, will in the coil 8 generates a low frequency component t which excites the magnetic core so that an oscillation such as in the arrangement of Fig. 2 (C). With this arrangement, the high frequency coil 8 can have a secondary winding be provided to which the capacitor 17 is connected.

In the arrangement according to FIG. 4, an ohmic resistor 18 with high resistance is connected in parallel to the capacitor 7! tet. The current flowing through this resistor 7 excites the high-frequency coil 8 in the opposite direction as the discharge current. This circuit has the same effect as the arrangements of Figures 2 (C) and 3, which make it possible the discharge lamp quickly and ψ safely with the help of the AC supply voltage to ignite the superimposed oscillation. Furthermore, the oscillation time can be reduced to a V / ert lying below IV 2, so that the oscillation current can be set to any value which is 1/4 to 1/20 of what is required in the arrangement according to FIG. 1; is.

The arrangement of Fig. 5 (A) prevents fluctuation the light intensity at low power at the start of an ignition process.

009837/1523 BAD

In the arrangement of FIG. 5 (A), the ignition circuit contains 6 a capacitor 7, a semiconductor switching element 9 land a high frequency coil 19 with two windings 2G and 21. The capacitor 7 has the output voltage at the frequency the voltage source 1 a ratio miL. . high impedance. The coil 19 contains a toroidal ferric core Or the like. And is provided with two windings 20 and 21, which are located in the resonant circuit and demagnetizing or have a compensatory effect.

When the AC supply voltage (1) is switched on in the arrangement according to FIG. 5 (A), the capacitor 7 is charged. The semiconductor switching element 9 becomes conductive, so that the capacitor 7 and the high-frequency coil 79 form an oscillating circuit. As a result, the Eivfcladungslattje 3 is supplied with a high-frequency high voltage - i. At the same time, the electrodes 4 and 5 are heated by the current supplied to the ignition circuit 6. When the electrodes are sufficiently warm, ignites the discharge lamp, and thereafter, the vibration is interrupted automatically ~ a of a & Rur + a of the figures 2 to 4 described above. .. With this arrangement, the discharge lamp is ignited with high efficiency because the windings 20 and 21 are connected to one another in a demagnetizing manner.

In order to explain this in more detail, it is assumed that the number of turns of the winding 21 is equal to zero. Then, the oscillating voltage has the waveform shown in Fig. 5 (B). When the turns ratio of the windings 21 and 22 is 1: 1, the oscillating voltage becomes as shown in Fig. 5 (C). If the turns ratio is equal to 3 : 1, the result in Flg. 5 (D). In either case, the oscillation frequency is about ten times that of Fig. 5 (B). Furthermore, its instantaneous value is reduced, but the envelope does not go back to zero. There-

009837/1523

the light intensity increases steadily during the Start of the ignition process. In other words, with the aid of this arrangement, it is possible to use a discharge lamp to ignite pleasantly in the eye.

The windings 20 and 21 are connected to one another in a demagnetizing manner, so that the total inductance L of the ferrite core changes as a function of the instantaneous value. The rate of change of the current di / dt is thereby increased considerably, and consequently also the oscillation frequency. At the same time, the L ^# value is reduced, and so is the instantaneous value.

^ In Fig. 6 is a modification of this embodiment shown, in which the winding 21 with the oscillating circuit, which consists of the capacitor 7 and a series circuit of the Semiconductor switching element 9 and the winding 20 is connected in series. In this arrangement, the Winding 21, via which current is supplied to the resonant circuit, connected to winding 20 in a demagnetizing manner, over which the discharge current flows from the capacitor 7, whereby the same effect as with the arrangement according to Fig. 5 (A) results.

In Fig. 7, another arrangement is shown in which ^ the supply of high-frequency voltage after the ignition of the P lamp can be interrupted automatically. This arrangement contains an additional voltage-dependent switching element 22 in series with the oscillating circuit. This ignition circuit 6 with the switching element 22 is connected to a discharge lamp, e.g. a fluorescent lamp with a hot cathode.

The AC supply voltage from the voltage source 1 wire fed to element 22 via capacitor 7. As a result, the element 22 becomes conductive and the capacitor 7 charged .. If the voltage on the capacitor 7 the load

009837/1523

Operating voltage of the element 9 is reached, the element 9 conductive and the capacitor 7 fast over d_ " Coil 8 and the switching element 9 are discharged. As a result, a voltage is induced in the coil 8 and applied to the Discharge lamp 8 placed. At the same time, diä Electrodes 4 and 5 heated. Repeat these processes. several times in each half-wave of the AC supply voltage. When the electrodes 4 and 5 are sufficiently warm, the discharge lamp 3 is ignited. When the lamp 3 burns, the element 22 is non-conductive because the operating voltage of the element 22 is higher than the burning voltage the lamp 3 is. Furthermore, the discharge lamp 3 is supplied with a high frequency voltage because the capacitor 7 and the coil 8 form an oscillating circuit.

By using this resonant circuit in the arrangement, discharge lamps can -20 ⁰ C (eg, fluorescent lamps with a power rating of 40 watts) even at a low temperature, for example, reliable ignition. In this case, a high-frequency voltage is applied to the discharge lamp, which ignites the discharge lamp, and if the discharge lamp is on, the supply of high-frequency or pulse voltage is interrupted. In addition, the discharge lamp can be ignited at a very low temperature.

The arrangement of Fig. 8 (A) represents another embodiment represents, which is improved over the arrangement of FIG. 2, and reliable ignition permitted even at low temperatures.

In general, the course of the running voltage of a discharge lamp, which is generated by an alternating voltage, is more conventional Frequency is fed, rectangular as shown in Fig. 8 (B). The leading edge of the Vibration is steep. The reason is that

009837/1523

the arc is first extinguished, a glow discharge is formed in the opposite direction and then ei.:. another arc is ignited. The rise time of this leading edge is on the order of milliseconds. The rise time increases with the capacitance of the smoothing capacitor, which is usually parallel to the lamp. Even in a low temperature atmosphere, the rise is relatively steep.

On the other hand, the breakdown voltage V i (brake-over voltage) of the semiconductor switching element (eg thyristor) in the ignition circuit 6 is lower than the maximum instantaneous value of the alternating supply voltage and higher than the maximum instantaneous value of the operating voltage of the discharge lamp. This breakdown voltage V ^ ₀ has a safety angle that applies to all types and ratings. fluorescent lamps is sufficient under normal operating conditions. However, if the discharge lamp is operated in a low ambient temperature or with a high operating voltage or if the capacitance of the capacitor 7 in the ignition circuit 6 is very large, the safety angle is not always sufficient, so that the operating voltage has a very high overshoot in its curve as shown by the broken line in Fig. 8 (B). In some cases the amount of this overshoot peak AV ^ is greater than 20 volts. Therefore, in some discharge lamps, this value Δ V ^ exceeds the breakdown voltage V ^ _{0 of} the semiconductor switching element 9. As a result, it can often happen that an oscillation occurs at the beginning of each half-wave, so that the light flickers or the arc cannot be maintained.

In this embodiment, the Zündschaltun contains _o 6, a device 23, such as a discharge tube, which is earlier than the thyristor 9 conductive, a suitable overall

009837/1523 BATH ORIGINAL

selected impedance and parallel to thyristor 9 lies.

The capacitor 24 of FIG. 8 (A) is used for interference signal suppression and smoothing. The ignition voltage of the discharge tube 23 is lower than the breakdown voltage V _{bo of} the semiconductor switching element 9.

When it is turned on, the AC voltage source 1 in the arrangement of Fig. .8 (A), "the vibrations in the out of the condenser 7 and the high-frequency coil 14 resonant circuit formed set and light the discharge lamp. When the overshoot & V ^, for example as a result of When the ambient temperature is low, the discharge tube 23 is ignited. The result is that most of the overshoot energy is consumed in this branch. Thereupon the thyristor is blocked. Even if the thyristor 9 is turned on (ignited), no oscillation occurs as a result, and the discharge process in the discharge lamp 3 therefore remains stable.

Instead of a discharge tube 23, a semiconductor switching element, for example a diac, also called bidirectional thyristor diode or bidirectional thyristor diode, with a relatively high operating resistance or an ohmic resistance can be used. This can be even at a temperature of, for example -5 to -10 ⁰ C, maintained a stable discharge state.

In order to: increase the preheating current intensity of a preheating / discharge lamp during the ZCid phase, various circuit arrangements can be designed according to the invention .

009837/1523 _p

The embodiment of FIG. 9 includes a current increasing circuit 30 for preheating the filament. This circuit consists essentially of a capacitor 31 and one connected in parallel to it Diode 32. The current increasing circuit 30 is located between the electrode 4 and the ignition circuit 6, which corresponds to: the basic design according to Fig. 1 (A) is formed. For setting the charging and discharging times of the capacitor 31 and to control the preheating current intensity for the lamp 3, an ohmic resistor can be connected to the capacitor 31 be connected in parallel or in series. It is also possible to use a thermistor as an ohmic resistance component or as part of the total ohmic resistance.

In the embodiment according to FIG. 10, the Heating current increasing circuit 30, a winding 33 of the choke coil 2 and a semiconductor switching element 34 parallel to winding 33 when the first high oscillating voltage is generated by the ignition circuit 6, the semiconductor switching element 34 becomes conductive due to the high rate of change dU / dt of this voltage, so that the preheating current increases.

In Fig. 11 is a modification of the embodiment shown according to FIG. In this embodiment, the preheat increase circuit 30 "includes one winding 35, which is connected to the choke coil 12 in a demagnetizing manner. The circuit 30 "is between the electrode 4 of the lamp 3 and the ignition circuit 6, so that the semiconductor switching element 34 according to FIG. 10 can be omitted.

In order to improve the running voltage, as described in the exemplary embodiment according to FIG. 8 (B), a Diode 36 must be connected between the electrode 4 of the lamp and the ignition circuit, as shown in FIG.

009837/1523

is posed. The diode 36 suppresses the voltage spike (overshoot) caused by the charging of the Capacitor 7 is caused when reversing the direction of the current.

In Fig. 13 is a modification of the embodiment. shown in Fig. 12, in which the diode 36 of FIG. 12 by a semiconductor switching element 37 and a ohmic resistor 38 connected in parallel to this is replaced. The capacitor 39 is used for suppression of interfering signals or for smoothing. If a capacitor with a sufficiently large capacity is used, can the resistor 38 is omitted.

In Fig. 14 a further modification is shown in which a thyristor 40 having a breakdown voltage that is higher than the ignition voltage of the lamp, is connected in parallel with the lamp and a ¹ impedance device 41 is the firing circuit 6 in series.

Figures 15 to 20 provide circuitry for a plurality of parallel-connected discharge lamps. Fig. 15 illustrates a circuit arrangement with a single firing circuit, and two discharge lamps. This circuit arrangement may be a combination of the embodiments according to FIGS 1 (B) and are considered. 9 A capacitor 42 for improving the power factor and a capacitor 43 for suppressing interference signals are connected in parallel to the voltage source 1. ■.

Fig. 16 illustrates a modification of the circuit arrangement according · Fig. 15 shows. In this case .The reactor in two parts 44 and 45 divided as two diodes 36 and 36 'are located between the condenser 7 or 7 ¹ and the thyristor. 9 In the circuit arrangement according to Fig.

009837/1523

For example, two capacitors 46 and 46 'can be used for power factor improvement in a preheating circuit , while two semiconductor switching elements 47 and 47' are used in place of the diodes 36 and 36 'shown in FIG. FIGS. 18, 19 and 20 represent further modifications in which the same reference numbers are used for the same components.

Fig. 21 illustrates a typical embodiment of a series circuit which epiel on the exemplary embodiment of FIG. 1 (A) is based.

009837/1525

Claims (19)

Claims My circuit arrangement for igniting a discharge lamp, with a first (closed) circuit containing a voltage source, a choke coil and the discharge lamp connected in series, and with a second (closed) circuit, characterized in that the second circuit is a semiconductor switching element " C (9), a capacitor (7) and an inductive component (8; 1O-12; 14-16; 2O) contains that the switching element (9) and the inductive component are connected in series; parallel to the lamp (3 ) and the capacitor (7) is also parallel to the lamp and the lamp (3) in the ignited state has a characteristic tube voltage that the switching element (9) has a conductivity trigger voltage that is higher than this tube voltage that the capacitor (7) and the inductive component form an oscillating circuit which can generate an oscillating voltage which is fed to the lamp (i, so that the lamp electrodes (4, 5) aufwex_ each between en the capacitor (7) and the voltage source (1) lie so that the voltage source "(ί) the. The capacitor (7) charges through these electrodes (4,5) and the electrodes are heated so that the switching element (7) becomes conductive when the capacitor (7) is charged to a voltage equal to the conductivity The trigger voltage is, whereupon the oscillating circuit generates the oscillating voltage, and the discharge lamp is ignited by the heating of the electrodes (4, 5) and the oscillating voltage, and the three tube pairs around the lamp (3) prevent the switching element \ 9 ) becomes conductive. 009837/1523 2. Arrangement according to claim 1, characterized in that the inductive component comprises one of two windings (11, 12) of a transformer (10) and the two Windings between one of the electrodes (4,5) and the switching element (9) are connected in series. 3. Arrangement according to claim 1 or 2, characterized in that the inductive component (14-16) has a tap, which is connected to one of the electrodes. 4. Arrangement according to one of claims 1 to 3 »characterized in that that a further capacitor (17) is connected in parallel to the inductive component. 5. Arrangement according to one of claims 1 to 4, characterized in that that parallel to the capacitor (7) is an ohmic resistor (18). 6. Arrangement according to one of claims 1 to 5 »characterized in that that in series with the capacitor (7) there is a coil (21) which is inductive to the inductive component (20) is coupled. 7. Arrangement according to one of claims 1 to 6, characterized in that that between the lamp (3) and the inductive component there is a further semiconductor switching element (22). 8 * arrangement according to one of claims 1 to 7, characterized in that a discharge tube parallel to the switching element (9) (23) is switched, the ignition voltage of which is lower than the conductivity release voltage of the semicon Switching element (9) is. 009837/1523 9. Arrangement according to one of claims 1 to 8, characterized in that that parallel to the lamp (3) a; Capacitor (24) is connected for interference signal suppression or smoothing. ; 10. Arrangement according to one of claims 1 to 9 »d a d u r c h characterized, that a capacitor (31) and a diode (32) consisting of a parallel circuit (30) between the Lamp (3) and the inductive component is located. 11. Arrangement according to one of claims 1 to 10, characterized in that that a parallel circuit (30 *) formed from a coil (33) and a further switching element (34) between the lamp (3) and the choke coil (2). 12. Arrangement according to one of claims 1 to 11, characterized in that that a coil (35) between the lamp and the indulcciven Component lies, and is inductively coupled to the Drosselspulc (2). 13. Arrangement according to one of claims 1 to 12, characterized in that that between the lamp and the inductive component there is a diode (36). 14. Arrangement according to one of claims 1 to 13, characterized in that that a further semiconductor switching element (37), an ohmic resistor (38) and a capacitor (39) in parallel lie between the lamp and the inductive component. 15. Arrangement according to one of claims 1 to 14, characterized in that a further semiconductor switching element (40) in parallel. ¹ : to the lamp and an impedance device (41) z \ ;. see the lamp and the inductive component 009837/1523 16. The arrangement according to one of claims 1 to 15 »characterized in that a second discharge lamp (3 ¹ ) is connected in parallel to the first-mentioned discharge lamp (3) and a capacitor (7 ^f ) is connected in parallel to the second discharge lamp (3 ^1). 17. Arrangement according to one of claims 1 to 16, characterized in that diodes (36, 36 ·) are located at least between the first discharge lamp (3) and the inductive component. 18. Arrangement according to claim 17,
characterized in that capacitors are connected in parallel to the diodes. 19. The arrangement according to claim 17 or 18, characterized in that with the diodes semiconductor switching elements in series are switched. 009837/1523 OBIGlNAL