EP2529599A2

EP2529599A2 - Operating device for gas discharge lamps

Info

Publication number: EP2529599A2
Application number: EP11705800A
Authority: EP
Inventors: Günter MARENT
Original assignee: Tridonic GmbH and Co KG
Current assignee: Tridonic GmbH and Co KG
Priority date: 2010-01-28
Filing date: 2011-01-28
Publication date: 2012-12-05
Also published as: AT12060U1; WO2011091462A3; DE112011100354A5; WO2011091462A2

Abstract

The invention relates to an operating device (1) for gas discharge lamps, in particular fluorescent lamps, comprising an inverter, which is supplied from a direct voltage and to which an output circuit having at least one heating circuit for operating at least one gas discharge lamp is connected, wherein the heating circuit has a heating transformer having at least one primary winding (Lprim) and at least one secondary winding (Lsek1, Lsek2), wherein the secondary winding (Lsek1, Lsek2) is connected in series with at least one coil of the gas discharge lamp, and wherein the primary winding (Lprim) is connected to a first monitoring means (R2), and at least one secondary winding (Lsek1, Lsek2) is connected to a second monitoring means (R1, R3, R4), characterized in that the two monitoring means (R2, R1, R3, R4) are coupled to each other.

Description

Operating device for gas discharge lamps

The invention relates to an operating device for operating gas discharge lamps according to the preamble of

Patent claim 1 and a method for operating gas discharge lamps according to the preamble of

Claim 20.

Technical area

Such control devices for gas discharge lamps are used for lighting and used in lighting systems to protect the gas discharge lamps gently

operate and achieve a long service life.

Usually, the gas discharge lamps are driven by operating devices and their coils heated.

Background Art In modern lighting systems, digital control commands are often applied to the central control unit

Operating devices sent. Through this external

Control commands can be specified in particular brightness values to different lighting conditions

to reach. To a wide dimming range for the

To enable gas discharge lamps, special heating circuits are often used.

DE 102004009995 A1 shows such a heating circuit, here is a switch for controlling the heater

required and an additional heating transformer necessary. Such heating circuits need to ensure correct coil heating several monitors that are each detected separately from a control circuit. Presentation of the invention

It is the object of the invention to provide an operating device with a heating circuit, which manages without the disadvantages mentioned above or allows a significant reduction of these disadvantages.

This object is achieved according to the invention for a generic device by the characterizing features of claim 1. Particularly advantageous embodiments of the invention are described in the subclaims.

The operating device according to the invention for

Gas discharge lamps, in particular fluorescent lamps, has an inverter which is supplied from a DC voltage to which an output circuit having

at least one heating circuit is connected for operating at least one gas discharge lamp. The

Heating circuit has a heating transformer with at least one primary winding and at least one secondary winding, wherein the secondary winding is connected in series with at least one filament of the gas discharge lamp, wherein the primary winding with a first

Monitoring means as well as at least one

Secondary winding is connected to a second monitoring means, and wherein the two monitoring means are coupled together. The invention also relates to a

Lighting system using the operating devices according to the invention. The invention also relates to a method for operating a gas discharge lamp, in particular

Fluorescent lamp, by means of a heating circuit and a control circuit for controlling the heating circuit, wherein the heating circuit at least two different

Monitoring means, wherein the control circuit has at least one high-frequency clocked switch in

Operating device controls and monitoring the

Heating circuit by means of the monitoring means in

Dependence on the switching state of this high-frequency

Switched switch takes place.

Description of the preferred embodiments

The invention will be explained in more detail with reference to the accompanying drawings. Show it:

Fig. 1 shows a control device according to the prior art

Fig. 2a shows a first variant of a heating circuit according to the invention

FIG. 2b shows a second variant of a heating circuit according to the invention. FIG. 3 shows a third variant of a heating circuit according to the invention The invention is based on a

Embodiment of an operating device explained.

Fig. 2a shows the part of a heating circuit of a

Operating device (1) for gas discharge lamps, in particular fluorescent lamps, comprising an inverter, which is supplied from a DC voltage, to the one

Output circuit comprising at least one heating circuit for operating at least one gas discharge lamp

connected. The heating circuit has a

Heating transformer with at least one primary winding

(Lprim) and at least one secondary winding (Lsekl,

Lsek2). The secondary winding (Lsekl, Lsek2) is connected in series to at least one filament of the gas discharge lamp, and the primary winding (Lprim) is provided with a first monitoring means (R2) as well as at least one secondary winding (Lsekl, Lsek2) with a second monitoring means (R3, R4 ) connected. The two

Monitoring means (R2, R3, R4) are interconnected

coupled. In this case, the second monitoring means (R3,

R4) additionally have further elements (R1, not shown in FIG. 2a as a coupled measurement but separate detection). Within the operating device (1), a

Control circuit (IC) may be present, which monitors the heating circuit based on the two monitoring means (R2, Rl, R3, R4). The control circuit (IC) can be made up of an integrated circuit, consisting of several, with each other

combined integrated circuits or even a combination of integrated circuits and discrete circuits. The control circuit (IC) can thus a single

Surveillance signal (SH) tap, which includes the signals of both monitoring means (R2, Rl, R3, R4).

This is only a single connection to the

Control circuit (IC) for monitoring the heating circuit required or at least a reduction of the terminals of the control circuit (IC) for monitoring the

Heating circuit. The control circuit (IC) can control at least one high-frequency clocked switch (Sw) in the output circuit (preferably in the inverter or heating circuit) and the

Monitoring of the heating circuit can be carried out depending on the switching state of this high-frequency clocked switch (Sw). Monitoring of the heating circuit can take place during the switch-on phase and at least monitoring of the heating circuit can take place during the switch-off phase of the high-frequency clocked switch (Sw). The first monitoring means (R2) can be used to monitor the current through the primary winding (Lprim). The first monitoring means (R2) can be replaced by an ohmic

Resistor or even a capacitor or a

additional monitoring secondary winding at

Heating transformer can be formed.

The second monitoring means (R1, R3, R4) can be used for

Monitoring the voltage over at least one coil and / or the current serve by at least one coil. The second monitoring means (R1, R3, R4) can be formed, for example, by an ohmic resistance or else an ohmic or capacitive voltage divider. The monitoring means (R2, R1, R3, R4) can be read out in such a way that monitoring, in particular measurement during a first time phase, takes place, and further monitoring, in particular a further monitoring

Measurement during a second time phase under the

Consideration of the monitoring result, in particular measurement result, the first time phase takes place.

For example, during the off phase of the

high-frequency clocked switch (Sw) a measurement on the second monitoring means (Rl, R3, R4) take place,

for example, the helical voltage and / or the

Wendel current. During the switch-on phase of the high-frequency clocked switch (Sw), a measurement of the current through the primary winding (Lprim) can then take place (by the first monitoring means (R2)), whereby this measurement still the measurement by the second monitoring means (Rl, R3, R4) is superimposed, since still a filament current for filament heating flows on the secondary side of the heating transformer.

From the measurement result detected during the switch-on phase of the high-frequency clocked switch (Sw), the measurement result previously determined (in the switch-off phase) can now be subtracted and thus only the measurement at the first monitoring means (R2) remains as the result of the measurement.

The heating circuit can be a high-frequency clocked

Switch (Sw), in addition to the

Inverter is arranged. Preferably, the high frequency clocked switch (Sw) is arranged in parallel or in series with the primary winding (Lprim). For example, the heating circuit can be fed by the bus voltage of the operating device and by the

Heating energy can be controlled by the duty cycle and / or the frequency of the high frequency clocked switch. This variant is shown in FIG. 2a.

But it is also possible that the heating circuit is coupled to the inverter or the output circuit and is controlled by the heating energy by the duty cycle and / or the frequency of the high-frequency clocked switch (Sw). This variant is shown in Fig. 2b

shown.

The monitoring of the current through the primary winding

(Lprim) by the first monitoring means (R2) can take place during the on-time of the high-frequency clocked switch (Sw).

The monitoring of the voltage and / or the current through the filament can take place during the switch-off time of the high-frequency clocked switch (Sw). The monitoring of the current through the coil can be done for example by an ohmic resistance Rl (as a so-called current shunt). The monitoring of the voltage across the coil can be done for example by an ohmic resistor divider (R3, R4).

The two monitoring means (R2, Rl, R3, R4) can be coupled to one another via a coupling element (Rk, Rkl and Rk2, respectively). The coupling member can be formed by a diode or a resistor or by other or even several components. At least one monitoring can be a measurement.

At least one monitor can do one

Threshold off. In case of a

Threshold off the high-frequency clocked switch (Sw) can be opened.

In case of a threshold value deactivation, the

Gas discharge lamp are switched off.

For example, a spiral break or removal of the gas discharge lamp can be detected during operation and then the inverter and possibly the entire operating device off or in a

Error mode to be switched.

The error mode can also be a mode of operation with

be adapted clocking of the heating circuit, wherein the heating circuit at regular intervals in operation

is taken to detect a re-insertion or replacement of the gas discharge lamp and then the

Lamp operation to start again. The adapted timing of the heating circuit can by a clocking of the

Switch (Sw) of the heating circuit as shown in Figs. 2a or 2b shown, this switch with

compared to the normal operation reduced on-time and / or frequency can be clocked. It can

For example, but also an adapted timing of

Half bridge (Sl, S2) take place. This can be done, for example, in the circuits of Fig. 2b or Fig. 3. In this case, for example, the two switches Sl and S2 can be briefly alternately driven or only the upper switch Sl can be clocked. At least one of the measurements can be used to detect the

Coil resistance and thus be used for lamp type detection. For example, the measurement of the

Current through the primary winding (Lprim) for determining the coil resistance and thus for the lamp type recognition serve, but it can also be a secondary-side measurement of the helical voltage and the filament current to determine the coil resistance and thus carried out for lamp type detection.

The operating device, in particular the control circuit IC can pass through several operating states (preheat, ignition, operation, error). The primary winding (Lprim) and the at least one

Secondary winding (Lsekl, Lsek2) can work on one

common ferrite core arranged and magnetically coupled. The common ferrite core can be at least two

Have legs. The common ferrite core may have the shape of a U-core. The common ferrite core may be in the form of an E-core. The common ferrite core may have an air gap.

If several gas discharge lamps are connected, they can be connected in series or parallel connection. It can be the number of secondary windings (Lsekl, Lsek2) at least the number of to be connected

Gas discharge lamps or coils in this heating circuit correspond. In the embodiment according to FIG. 2b, it is also possible that the switch (Sw) of the heating circuit is not clocked at high frequency, but only in certain operating states such as preheating

permanently switched on. However, it may be advantageous to high-frequency clock the switch (Sw) of the heating circuit, in particular in a dimming operation, in order to prevent the

To adjust heating power. If the switch (Sw) of the heating circuit is not

High frequency clocked, the monitoring of the

Heating circuit in the same sense as in the case of the example of Fig. 3 explained. Fig. 3 shows a further variant of an operating device according to the invention.

The essential difference to the operating device 1 of Figure 2 is that the heating circuit is coupled to the output circuit and the high-frequency clocked switch (Sl or S2) is arranged in the inverter. The

The heating circuit itself is therefore passive and not directly controllable, but only via the control of the at least one high-frequency clocked switch (Sl or S2), in the inverter (i.e., the half-bridge)

is arranged. In this example, the monitoring of the heating circuit can take place by means of the monitoring means (R2, R1) as a function of the switching state of one of the two high-frequency clocked switches of the half-bridge (S1 or S2). It can be done, for example, during the activation of the upper half-bridge switch (Sl) the monitoring means of the first monitoring means (R2), in particular can be made the ^'monitoring the current through the primary winding (Lprim). In the off phase of the upper

Half-bridge switch (Sl) monitoring can take place by means of the second monitoring means (Rl). Preferably, the monitoring of the voltage and / or the current through the coil during the off time this

high frequency clocked switch (Sl) done.

During the preheating and / or heating during the dimming operation, a resonance cant of each of at least one capacitor and a winding of the

Heating transformer or an additional

Inductance, which is arranged in the heating circuit can be used. For example, the capacitor may be arranged in series or parallel to the primary winding (Lprim) or the secondary winding (Lsekl, Lsek2).

Thus, according to the invention, a method for operating a gas discharge lamp, in particular

Fluorescent lamp, by means of a heating circuit and a control circuit (IC) for controlling the heating circuit allows, wherein the heating circuit at least two

various monitoring means (R2, Rl, R3, R4). The control circuit (IC) controls at least one

high frequency clocked switch (Sw, Sl, S2) in

Operating device (1) and the monitoring of the heating circuit by means of the monitoring means (R2, Rl, R3, R4) depending on the switching state of this high-frequency

clocked switch (Sw, Sl, S2). Preferably, the monitoring by means of the first monitoring means (R2) takes place during the switch-on of the high-frequency clocked switch (Sw, Sl, S2), in particular, the monitoring of the current through the primary winding (Lprim) can take place. The monitoring by means of the second monitoring means (Rl, R3, R4) can take place during the turn-off time of the high-frequency clocked switch (Sw, Sl, S2). Preferably, the

Monitoring the voltage and / or current through the filament during the off-time of the high-frequency

clocked switch (Sw, Sl, S2) take place.

Claims

Claims :

1. operating device (1) for gas discharge lamps, in particular fluorescent lamps, with an inverter which is supplied from a DC voltage to which an output circuit having at least one heating circuit for operating at least one gas discharge lamp is connected, wherein the heating circuit is a heating transformer with at least one primary winding (Lprim ) and at least one secondary winding (Lsekl, Lsek2), wherein the

Secondary winding (Lsekl, Lsek2) is connected in series with at least one filament of the gas discharge lamp, and wherein the primary winding (Lprim) with a first

Monitoring means (R2) as well as at least one

Secondary winding (Lsekl, Lsek2) with a second

Monitoring means (Rl, R3, R4) is connected,

characterized in that the two monitoring means (R2, Rl, R3, R4) are coupled together.

2. Operating device according to claim 1, characterized in that a control circuit (IC) is present, based on the two monitoring means (R2, Rl, R3, R4) the

Heating circuit monitored.

3. Operating device according to claim 2,

characterized,

that the control circuit (IC) controls at least one high-frequency clocked switch in the inverter or heating circuit and the monitoring of the heating circuit in

Dependence on the switching state of this high-frequency

Switched switch takes place.

4. Operating device according to claim 3, characterized

in that at least monitoring of the heating circuit during the switch-on phase and at least monitoring of the heating circuit during the switch-off phase of the high-frequency clocked switch takes place.

5. Operating device according to one of claims 1 to 4, characterized

in that the first monitoring means (R2) serves to monitor the current through the primary winding (Lprim).

6. Operating device according to one of claims 1 to 5, characterized in that

that the second monitoring means (Rl, R3, R4) for

Monitoring the voltage across at least one coil and / or the current through at least one coil is used.

7. Operating device according to one of claims 3 to 6, characterized

that the heating circuit is coupled to the output circuit and the high-frequency clocked switch is arranged in the inverter.

8. Operating device according to one of claims 3 to 6, characterized in that the heating circuit comprises a high-frequency clocked switch, in addition to the

Inverter, in particular parallel or in series with the primary winding (Lprim) is arranged.

9. Operating device according to claim 8, characterized

marked,

that the heating circuit of the bus voltage of

Operating device is powered and is controlled by the heating energy by the duty cycle and / or the frequency of the high-frequency clocked switch.

10. Operating device according to claim 8, characterized

marked,

that the heating circuit is coupled to the inverter or the output circuit and is controlled by the heating energy by the duty cycle and / or the frequency of the high-frequency clocked switch.

11. Operating device according to one of claims 8 to 10, characterized in that

in that the monitoring of the current through the primary winding (Lprim) by the first monitoring means (R2) takes place during the switch-on time of the high-frequency clocked switch.

12. Operating device according to one of claims 8 to 11, characterized in that

that the monitoring of the voltage and / or the current through the coil during the off time of

high frequency clocked switch takes place.

13. Operating device according to one of claims 1 to 12, characterized in that

the two monitoring means (R2, R1, R3, R4) are coupled together via a coupling link.

14. Operating device according to one of claims 1 to 13, characterized

that at least one monitoring is a measurement.

15. Operating device according to one of claims 1 to 14, characterized in that

that at least one monitoring a

Threshold off is.

16. Operating device according to claim 15, characterized

marked,

that in case of a threshold value shutdown the

high-frequency clocked switch is opened.

17. Operating device according to one of claims 15 to 16, characterized

that in case of a threshold value shutdown the

Gas discharge lamp is switched off.

18. Operating device according to one of claims 14 to 17, characterized

that a measurement is used to detect the coil resistance and thus for lamp type detection.

19. Lighting system, comprising an operating device (1) according to one of claims 1 to 18.

20. A method for operating a gas discharge lamp, in particular a fluorescent lamp, by means of a heating circuit and a control circuit (IC) for controlling the

Heating circuit, wherein the heating circuit has at least two different monitoring means (R2, Rl, R3, R4), characterized in that the control circuit (IC) at least one high frequency clocked switch in

Operating unit (1) controls and monitoring the

Heating circuit by means of the monitoring means (R2, Rl, R3, R4) in response to the switching state of this high-frequency clocked switch takes place.