WO2007028467A1

WO2007028467A1 - Starter circuit with hf damping element

Info

Publication number: WO2007028467A1
Application number: PCT/EP2006/007654
Authority: WO
Inventors: Roman Ploner; Gerd MÜHLBACHER
Original assignee: Tridonicatco Gmbh & Co. Kg
Priority date: 2005-09-02
Filing date: 2006-08-02
Publication date: 2007-03-15
Also published as: EP1920640A1; CN101253815A; DE202005013895U1; CN101253815B

Abstract

A superimposed starter device for gas discharge lamps comprises a charge circuit (R1) for charging at least one capacitor (C1). A transformer is also provided with a primary winding parallel to the capacitor and a separate secondary winding, said secondary winding being wired between a voltage supply power line (D) and the lamp (LA). The energy stored in the at least one capacitor (C1) from the primary winding (L1) may be coupled into the secondary winding (L1). A damping body (R2) is in series between the parallel circuit of capacitor (C1) and primary winding (L2) and the voltage supply power line (D) and limits at least high frequency current through the at least one capacitor (C1).

Description

Ignition circuit with RF attenuation elements

The present invention relates to a superimposed device for discharge lamps. In this case, the invention relates on the one hand an advantageous circuitry realization for a superposition igniter as well as advantageous housing for a superimposed ignitor.

From DE 3 339 814 Al a circuit for a superposition ignitor as shown in Figure 5 is known.

In the known circuit according to the appended FIG. 5, a high-pressure metal vapor discharge lamp 10 is connected via a ballast 12 and an ignition device 13 to the lines 20 and 21 of a supply network. The ignitor 13 has a pulse transformer 14 with a primary winding 18 and a secondary winding 15, the latter being in series with the lamp 10 and its ballast. Parallel to the series connection of secondary winding 15 and lamp 10, a series connection of a surge capacitor 17 and a Zündhilfskondensators 11 is provided, wherein the Zündhilfskondensator 11 turn a discharge resistor 16 is connected in parallel. In turn, a series connection of the primary winding 18 of the pulse transformer 14, a symmetrically switching four-layer diode 19 and an induction coil 30 is connected in parallel with the surge capacitor 17. The primary winding 18 of the pulse transformer in turn is in parallel an RC attenuator 31, 32. The high frequency return is via the series connection of the surge capacitor 17 and the

Zündhilfskondensators 11 ensures. The Hochfrequenzrückschluss is ensured via the series connection of the surge capacitor 17 and the auxiliary ignition capacitor 11.

The surge capacitor 17 is charged via the auxiliary ignition capacitor 11 and the resistor 16 until the voltage across the surge capacitor 17 reaches a value that is above the switching voltage of the four-layer diode 19. As a result, the resistance of the four-layer diode 19 approaches zero, so that now the surge capacitor 17 discharges via the primary winding 18 of the pulse transformer 14 and the ironless induction coil 30, this discharge process being damped by the R-C attenuator 31, 32. The voltage drop in the primary winding 18 is transformed in proportion to the number of turns of the pulse transformer 14. While the four-layer diode 19 is turned on, and the resonant circuit consisting of the ballast 12 and the auxiliary ignition capacitor 11 is excited to vibrate, so that the ignition auxiliary capacitor 11 and the secondary winding 15 of the pulse transformer 14 to the lamp 10, an excessive open circuit voltage is formed the lamp ignition allows.

Once the surge capacitor 17 is discharged and thus its voltage is below the switching voltage of the four-layer diode 19 again, this blocks when reversing the current and interrupts the circuit for the existing of the ballast 12 and the Zündhilfskondensator 10 pure-resonant circuit. The voltage across the surge capacitor 17 increases again in the course of the oscillation until the switching voltage for the four-layer diode 19 is reached here, which then turns on again. In such a device is of a

Überlagerungszündgerät spoken, since the currents of the ballast 12 and the Zündhilfskondensators 10 overlap at the moment of lamp ignition.

The overlay ignition circuit for a lamp LA shown in FIG. 6 and known from the market is based on the above-explained basic principle of the circuit according to FIG. 5 and has a first line D, which is live, and a second line N, which is not live. These terminals D, N are connected to a magnetic ballast. The surge capacitor Cl is charged by means of a charging resistor Rl until the voltage across the surge capacitor Cl exceeds the switching voltage of the four-layer diode Vl, whereupon an ignition pulse is coupled to the secondary winding of the pulse transformer Ll designed as an autotransformer.

To protect a Zündhilfskondensators C2 and the capacitor Cl another ohm 'shear resistor R2 between the capacitors C1, C2 and the non-leading power supply line N is connected. This resistor R2 is used to attenuate high frequency cross currents through the capacitors C1, C2 to protect them. These cross-currents are generated for example by the magnetic ballast when the connected lamp shows high-frequency fluctuations in power consumption.

The present invention has now taken on the task of improving such a Überlagerungszündgerät with respect to the spatial arrangement of the components of the circuit and their inclusion in a housing.

These objects are achieved by the features of the independent claims. The dependent claims form the central idea of the invention in a particularly advantageous manner on.

According to a first aspect of the present invention, a superposition igniting apparatus for discharge lamps is proposed. A charging circuit charges at least one capacitor (surge capacitor).

A transformer is provided with a primary winding connected in parallel to the capacitor and a secondary winding separated therefrom, which is connected between a voltage-carrying supply line and the lamp and to which secondary winding the energy stored in the at least one capacitor can be coupled in from the primary winding.

An attenuator is connected in series between the parallel circuit of capacitor and primary winding and the live supply line. The attenuator attenuates high frequency current through the at least one capacitor to protect it.

The attenuator corresponds to the resistor R2 of the prior art according to Figure 6, which is now connected to a different line than the charging resistor for the surge capacitor, namely with the non-live line of the power supply. As in the prior art, this ohmic and / or inductive attenuator according to the present invention also serves, in the case where high-frequency noise is fed back from the lamp, in response to it from the magnetic ballast, no excessive high-frequency currents through the Capacitor flow.

As will be explained later, by redesigning the circuit such that the attenuator is now connected to another port of the Supply voltage is connected as the charging circuit for the surge capacitor, a particularly advantageous spatial distribution of the circuit can be achieved.

In that, in contrast to other known embodiments, the pulse transformer according to the present invention is designed not as an autotransformer, but with two separate windings, these windings can be made, for example by means of wires made of different materials and / or different diameters, allowing greater freedom in design the circuit allows.

The attenuator according to the present invention may be an ohmic resistor and / or an inductor.

The charging circuit usually also has at least one ohmic resistance.

The resistor of the charging circuit can be connected in parallel with a Zündhilfskondensator.

The attenuator may have an ohmic resistance whose resistance is significantly lower than that of the charging resistor.

For example, the resistance value of the ohmic resistance of the attenuator may be less than 1 kOhm, preferably less than 200 ohms, which is far below the usual values for charging resistors.

The charging resistor may be connected to a non-live supply line.

In this case, therefore, the charging resistance and the ohmic resistance of the attenuator are connected to two different terminals, namely, on the one hand, to a non-resonant terminal. live supply line and on the other hand to a voltage-carrying supply line, which provides for a particularly advantageous spatial distribution of these components in a circuit.

The invention also relates to a housing for a superimposed ignition device, wherein the housing has a conical contour in temporal view. This conical contour can be advantageous, for example, for the purpose of demolding during injection molding of a plastic housing. Furthermore, the upper side of the housing is provided with a leveling web, which thus runs perpendicular to the inclination of the taper and whose upper side together with the maximum side of the remaining upper side of the housing forms a plane parallel to the level of the housing.

By means of the leveling bar, such housings, although they actually have a conical basic shape, can be stacked parallel to one another.

Furthermore, the web can be designed such that it forms an abrasion protection (for example for a coating and / or printing) of the upper side of the housing.

Advantageously, an ignition circuit is incorporated in the housing encapsulated such that one end of the cup-shaped housing protrudes well above the level of the cured potting material and the circuit components.

For example, the edge of the cup-shaped housing at the open insertion side into the range of terminals of the circuit range.

This is insofar procedurally advantageous, as thus the cup-shaped housing with the already recorded there unshrouded ignition circuit before with Potting compound can be filled in liquid form. in the

As a result of the hardening and the concomitant shrinkage and the inflow into voids, the level of the hardened potting material then drops significantly below the end of the cup-shaped housing. In such a dimensioning of the cup-shaped housing so a very slow filling or filling in several steps is not necessary.

Advantageously, the inside of the housing is provided with a receptacle for a crimp connection of the recorded ignition circuit.

Further features, advantages and features of the present invention will now be explained with reference to the figures of the accompanying drawings.

FIG. 1 shows an ignition circuit according to the present invention,

Figure 2 shows a plan view of a circuit arrangement for

Implementation of the circuit according to

Schematic of Figure 1,

FIG. 3 shows a perspective view of a housing for a device according to the invention

Circuit,

FIG. 4 shows a side view of this housing,

Figure 5 shows a prior art, as it is known for example from DE 3 339 814 Al, and Figure 6 shows a circuit as known from devices available on the market.

Figure 1 now shows a circuit according to an embodiment of the present invention. Since substantially the same components as in the circuit according to Figure 6, but in a different arrangement, comparable components with the same reference numerals as in Figure 6 are designated.

Comparable to the circuit according to FIG. 6, a high-resistance charging resistor R 1 is also provided in the exemplary embodiment, which is connected to the non-live line N and serves to charge the surge capacitor C 1.

The pulse transformer L1 according to the present invention is constructed with two windings (separated by the resistor R2), which offers advantages in that the windings can be formed of different materials and / or different wire diameters. So there is no autotransformer.

Between the parallel circuit of the primary winding of the pulse transformer Ll and the surge capacitor Cl and the live line D is an attenuator R2, for example in the form of an ohmic resistance (as shown R2) and / or an inductance connected.

According to the invention, therefore, the charging resistor Rl and the attenuator R2 are each having different lines

N or D provided by the ballast

Supply voltage connected.

Optionally, a resistor and / or an inductance can be connected in series with the four-layer diode Vl, which is represented in FIG. 1 by the reference symbol LR1. As will be explained later with reference to FIG. 2, this measure has advantages with respect to the possibilities of spatial arrangement opened up in a real implementation of such a circuit.

If the attenuator R2 is designed as an ohmic resistor, then the resistance value is selected to be significantly lower than that of the charging resistor R1. For example, the resistance value of the attenuator R2 may be less than 1 kOhm, preferably about 100 ohms. An excessively high resistance value is disadvantageous in that as a result of an excessive damping of the oscillating circuit ballast / ignitor, the number of ignition pulses is significantly reduced.

If, alternatively or additionally, an inductance is used in the attenuator, it must be switched off to the expected frequency of the high-frequency cross-current.

FIG. 2 shows a particularly advantageous implementation of the circuit according to FIG. 1. The circuit of FIG. 2 can then be accommodated in a housing, for example according to FIG. 3 or FIG. 4.

As can be seen in Figure 2, the terminals N, LA (lamp) and D are all arranged on the same side of the circuit.

The resistor Rl is directly connected to the non-voltage-carrying terminal N.

On the side facing away from the resistor R2 is spatially connected favorably with the live terminal D. The capacitors Cl, C2 are accommodated in a single housing and are formed by different taps as shown in Fig. 2. Of course, these capacitors C1, C2 can also be provided separately.

Thus, the spatial separation of the resistors Rl, R2 is to be seen as particularly advantageous. This is not least advantageous in the sense that, in particular, the resistor R2 can have a significant evolution of heat.

The bobbin Ll serves to fix various components and wire guides. For this purpose, wires can be guided and held in labyrinth-like recesses of the bobbin.

FIG. 3 shows a housing G in which a circuit according to FIG. 2 can be received and then cast.

Of course, the terminals N, LA, D protrude out of the housing G. On the side of the housing G cooling fins Ri may be provided.

4 shows a side schematic view of the housing of FIG. 3.

The housing has a conical contour, wherein this conicity can be advantageous, for example, during demolding of such a plastic housing from an injection mold. It should be noted that the conicity is of course exaggerated in Fig. 4 for better illustration.

According to the invention, a leveling web St can be provided at the top of the housing G, the uppermost

Point together with the highest lying area of the Top of the housing G forms a plane which is parallel to the standing plane (bottom) of the housing G.

This has advantages in that such a housing can now be stacked in parallel stacked. Furthermore, the leveling web St serves for abrasion protection for the surrounding areas of the upper side of the housing G.

As is known per se, a circuit according to FIG. 2 is thus inserted into the cup-like housing G (from the left in FIGS. 3 and 4). In the cup-shaped housing then a potting liquid are filled from the insertion side.

In the course of hardening and filling of teaching rooms, the fill level Ni of the potting compound drops over a fairly long period of time.

According to the invention, however, the entire potting compound can be filled in one go, since the cup-shaped housing G on the insertion side (left in Fig. 3 and 4) over the area to be potted circuit recorded circuit clearly. For example. The edge of the cup may end approximately in the middle of the clamps LA, N, D. Thus, the cup-shaped housing at the insertion side is clearly (at least several millimeters) beyond the filling level of the cured potting material addition.

Claims

Claims :

1. Superimposed ignitor for discharge lamps, comprising:

a charging circuit (Rl) for charging at least one capacitor (Cl),

- A transformer having a parallel to the capacitor (Cl) connected to the primary winding (L2) and a separate secondary winding (Ll), which is connected between a live power supply line (D) and the lamp (LA) and in the at least one capacitor (Cl) stored energy from the primary winding (Ll) can be coupled forth, and

- An attenuator (R2) connected in series between the parallel circuit of capacitor (Cl) and

Primary winding (L2) and the voltage-carrying supply line (D) is connected and at least limited high-frequency current through the at least one capacitor (Cl).

2. igniter according to claim 1, characterized in that the attenuator is a resistor (R2) and / or an inductance.

3. Ignition device according to claim 1 or 2, characterized in that the charging circuit has at least one ohmic resistance (Rl).

4. Ignition device according to claim 3, wherein the resistor (Rl) of the charging circuit Ignition auxiliary capacitor (C2) is connected in parallel.

5. Ignition device according to claim 3 or 4, wherein the attenuator has an ohmic resistance (R2) whose resistance value is significantly lower than that of the charging resistor (R1).

6. Ignition device according to claim 3, 4 or 5, wherein the resistance of the ohmic resistance (R2) of the attenuator is less than 1 kOhm, preferably less than 200 ohms.

7. Ignition device according to one of claims 3 to 6, wherein the charging resistor (Rl) is connected to a non-voltage-carrying supply line (N).

8. Overlap ignitor for discharge lamps, comprising:

a charging circuit for charging at least one capacitor (Cl), the charging circuit having an ohmic resistance (R 1) which is directly connected to a non-live supply line (D),

a transformer having a primary winding (L2) connected in parallel with the capacitor (Cl) and a secondary winding (L1) connected thereto, which is connected to the lamp (LA) and to the energy stored in the at least one capacitor (Cl) Primary winding (L2) can be coupled in, and

- An attenuator (R2), which is directly connected to a live supply line (D) and high-frequency current through the at least a capacitor (Cl) limited.

9. Overlay ignition device for discharge lamps, comprising: - a charging circuit (R1) for charging at least one capacitor (C1),

- A transformer with a parallel to the capacitor (Cl) connected primary winding (L2) and a separate secondary winding (Ll), which between a live supply line

(D) and the lamp (LA) is connected and to which in the at least one capacitor (Cl) stored energy from the primary winding (Ll) can be coupled forth, and - an attenuator (R2), which with a different supply line than the charging circuit (Rl) is connected.

10. housing for a Überlagerungszündgerät, which has a conical contour in lateral view, further comprising a leveling ridge, which is perpendicular to the inclination of the conicity and the upper side together with the highest point of the remaining upper side of the housing forms a plane parallel to the standing plane of the housing ,

11. Housing according to claim 10, wherein the web forms an abrasion protection for a coating and / or printing the top of the housing.

12. Housing according to one of claims 10 or 11, wherein in the housing an ignition circuit is encapsulated, wherein one end of the cup-shaped

Housing well above the level of cured Potting material survives.

13. Housing according to one of claims 10 to 12, wherein in the housing an ignition circuit is encapsulated, wherein the edge of the cup-shaped

Housing extends into the area of the connection terminals of the ignition circuit.

14. Housing according to one of claims 10 to 13, wherein the inner side of the housing has at least one receptacle for a crimp connection of the incorporated ignition circuit.