EP1920639A1

EP1920639A1 - Circuit arrangement for controlling the operation of an electronic transformer

Info

Publication number: EP1920639A1
Application number: EP06793059A
Authority: EP
Inventors: Helmut Haeusser-Boehm; Joerg Lott
Original assignee: Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Current assignee: Osram GmbH
Priority date: 2005-08-30
Filing date: 2006-08-29
Publication date: 2008-05-14
Also published as: WO2007025967A1; DE102005041077A1; US7812545B2; CA2619934A1; US20090102394A1

Abstract

The invention relates to a circuit arrangement for controlling the operation of an electronic transformer (1) whose power supply can be lowered. The electronic transformer (1) is electrically connected to an output of a switch (7), and the switch (7) can be controlled by means of a control unit (5). A radio interference suppression circuit (8) is coupled to the switch (7) and, according to a control state, which exists on the switch (7), for controlling the starting behavior of the electronic transformer (1), the radio interference suppression circuit (8) can be disconnected from the switch (7) and/or an output (A) of the switch (7) can be short-circuited. The invention also relates to a method for controlling the operation of an electronic transformer.

Description

Circuit arrangement for the operation control of an electronic transformer

Technical area

The present invention relates to a Schaltungsanord ^¬ tion for operation control of an electronic transformer.

State of the art

It is known to dim the power supply or the mains voltage of electronic transformers, which are used, for example, for the power supply of electric lamps. Conventional systems use ordinary installation dimmers which are mechanically turned off. However, these installation dimmers allow only a limited dimmability, with a low or low dimming position with a low dimming level is still relatively high. In addition, it is also known to use so-called DALI (Digital Addressable Lighting Interface) dimmers in more modern systems. Such DALI dimmers allow for minimum dimming with a very low dimming level, which are significantly lower than those of the above-mentioned installation dimmers. If such DALI dimmer set on and set very low dimming level or an OFF position, is only an electronic Tren ^¬ voltage, for example by means of a switch possible and EMI suppression components connected to the switch, the electronic transformer im- disadvantageously restarted, whereby a noise is generated. is evidence that troublefree especially in metal reflector lamps may be ^¬ rend and leads to increased radio interference.

The generation of noise by dimming the mains voltage with phase dimmers or phase gating dimmers in conjunction with electronic converters or transformers is given at very low dimming settings or even when the electronic transformer is switched off.

Presentation of the invention

The present invention is therefore based on the object to control the operation of the electronic transformer such that the noise can be prevented by dimming the mains voltage. Especially at very low dimming positions or in the off state of the electronic transformer, the noise should be prevented.

This object is achieved by a circuit arrangement having the features of claim 1. Dar ^¬ beyond this object is also achieved by a method for controlling the operation of an electronic transformer, which has the features of claim 10 ^¬ .

A circuit arrangement according to the invention is used to load ^¬ operation control of an electronic transformer and thus also formed of an electronic transformer for controlling a start behavior. The electronic ^¬ cal transformer is powered by a mains voltage, the mains voltage is dimmable. The elekt ^¬ tronic transformer is connected to an output of a formwork Ters for switching on and off of the electronic transformer electrically connected. Furthermore, this switch is controllable via a control unit, wherein a radio interference suppression circuit is coupled to this switch and, depending on a control state applied to this switch, the radio interference suppression circuit can be disconnected from the switch and / or the output of the switch can be short-circuited. By the invention can be achieved that the noise when dimming the mains voltage can be significantly reduced. In particular, at very low dimming positions or in the off state of the electronic transformer thus noise (caused by a quasi-automatic starting of the electronic transformer) can be prevented. Particularly, when the dimming of the mains voltage by means of a dimmer, for example a DALI dimmer occurs wel ^¬ cher only off "electronically" thereby can be prevented that the electronic transformer is started over again and a disturbing overall Noise is generated.

Advantageously, the circuit arrangement is designed such that the radio interference suppression circuit can be separated from the switch and / or the output of the switch can be short-circuited if the control state applied to the switch is characterized by a non-activation of the switch by the control unit. In particular, in such states, in which thus no control signal is transmitted from the control unit to the switch, it is provided to disconnect the radio interference suppression circuit from the switch and / or to short-circuit the output of this switch. - A -

Furthermore, the circuit arrangement is preferably designed such that the radio interference suppression circuit can be separated from the switch and / or the output of the switch can be short-circuited if a dimming position of the supply voltage is less than 20 percent of a maximum dimming position. In particular, it is advantageous to disconnect the radio interference suppression circuit from the switch and / or to short-circuit the output of the switch if a dimming position of the supply voltage or the mains voltage is less than 10 percent, in particular less than 5 percent, of this maximum dimming position. It can thereby be achieved that at very low dimming positions, the starting behavior of the electronic transformer can be changed to the effect that a continuous restart, in particular via the radio interference suppression circuit, can be prevented. Thus, the noise of the e- lektronischen transformer and the electric lamp can be avoided.

The circuit arrangement is preferably also forms such a way excluded that the radio interference suppression circuit from the switch to separate and / or the output of the switch is short-circuited when the electronic transformer is out scarf ^¬ tet. In the known dimming concepts and in particular when a DALI dimmer is used, such noise generation of the electronic transformer can also be accompanied when switched off. Due to the preferred embodiment of the invention can thus be prevented not only at very low dimming positions, but also in the off state of the dimmer, a corresponding noise. Preferably, the circuit arrangement is designed such that the radio interference suppression circuit is electrically separable from the switch for switching on and off of the electronic transformer by a further switch. In particular, when the switch for switching on and off of the electronic transformer is not controlled by the control unit, thereby the electrical separation of the radio interference suppression of this switch, the starting behavior of the electronic transformer can be changed. A restart of the electronic transformer, especially at very low dimming positions or in the off state of the electronic transformer can be avoided.

Preferably, the radio interference suppression circuit is characterized by a series circuit of a resistor and a capacitor. The other switch for electrical isolation or electrical connection of the radio interference suppression circuit with the switch for switching on and off of the electronic transformer can be connected in a series circuit between the resistor and the capacitor of the radio interference suppression circuit. Likewise, however, can also be provided that this further switch connected downstream of the resistor and the capacitor, or is pre-tet ^¬ scarf.

Advantageously, the circuit arrangement is designed such that the output of the switch can be short-circuited via a circuit branch, which is connected in parallel to the electronic transformer. This embodiment of the parallel circuit branch is it particularly advantageous when a non-triggering of the switching ^¬ ters for activating and deactivating the electronic trans- given formators. The circuit branch has in be ^¬ preferred manner, a resistor and a separate switch. Through this design it can be achieved that the switch for switching on and off of the electronic transformer is of the electronic transformer through this resistor in the signal branch of the output of the switch to turn on and off ^¬ virtually short-circuited in particular in the state of non-actuation, and thus the Output voltage of this switch is limited to values that are below a voltage threshold. This voltage ^¬ threshold value is chosen such that it is below the starting voltage of the electronic transformer. This prevents the electronic transformer from restarting at very low dimming settings or when the dimmer is switched off. For example, a voltage having a value of about 33V or less may be provided for this voltage threshold. A voltage value of about 33V corresponds approximately to a starting voltage of a DIAC, which is generally provided in such an electronic transformer for starting.

In an inventive method for controlling the operation of an electronic transformer, the voltage supply is dimmable, the electronic Trans ^¬ formator to an output of a switch for turning on and off of the electronic transformer is electrically connected. According to the method, the switch is controlled by a control unit, wherein a radio interference suppression circuit is coupled to the switch and, depending on a control state applied to the switch, is connected to the control unit. tion of the starting behavior of the electronic Transforma ^¬ sector the radio interference suppression circuit separated from the switch and / or the output of the switch is shorted. An improved operating behavior of the electronic transformer can also be achieved by the method according to the invention. In particular, when very low dimming positions or even a switched-off state of the electronic transformer is given, an unwanted restart of the electronic transformer and an associated unwanted and annoying noise can be prevented. In particular, when the dimming position by means of a DALI dimmer o generally the dimmer, which only "off" electronically switched off, can also be set to very low dimming settings, the starting behavior of the e- lektronischen transformer can be influenced in a desired manner.

Advantageous embodiments of the circuit arrangement according to the invention are, insofar as can be transferred, to be regarded as advantageous embodiments of the method according to the invention.

Brief description of the drawings

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

1 shows a first embodiment of the inventive circuit arrangement; and

Figure 2 shows a second embodiment of the inventive ^¬ circuit arrangement. Preferred embodiment of the invention

In Figures 1 and 2 identical or functionally moving ^¬ surface elements having the same reference numerals are provided.

1 shows a first embodiment of a scarf ^¬ processing arrangement for controlling the operation of an electronic transformer 1. The electronic transformer 1 is characterized in Figure 1 symbolically by the drawn Lastele ^¬ ment. It is known that such electronic transformers 1 have a half-bridge configuration. Moreover derarti- ge electronic transformers 1 include a start-up circuit comprising a pulse generator, such as a DIAC, elements so ^¬ such as a capacitor and optionally further Bauele ^¬ through which switch the oscillation of one Oszil ^¬ lators of the electronic transformer according to the input causes can be. The voltage supply of the electronic transformer 1 via the network ^¬ voltage ^terminals L and N. In the illustrated Ausführungsbei ^¬ game, the mains voltage is dimmable. For this purpose, a DALI dimmer is provided, wherein a corresponding dimming signal 2 is transmitted to a DALI interpreter 3. This dimming signal 2, which characterizes a DALI command, can be generated, for example, by the operation of a button. The DALI interpreter 3 generates an output signal 4, which is transmitted to a control unit 5. The characterizing the desired dimming level output ^¬ signal 4 is transmitted to a control unit 5 which generates a function of this output signal 4 of the DALI interpreter 3 a control signal 6, which can be applied to ei ^¬ NEN switch. 7 The switch 7 is preferably designed as a voltage-proof switch. As can be seen from the illustration in FIG. 1, the switch 7 for switching the electronic transformer 1 on and off is connected to an input E to a connection L of the mains voltage. In addition, the switch 7 is electrically connected to an output A to the electronic transformer 1.

By means of the electronic transformer 1, an electric lamp (not shown) electrically connected thereto, for example a metal reflector lamp, is supplied with energy.

As can be seen in Figure 1, the switch 7 comprises a first transistor 71, and a second transistor 72, wherein both transistors 71 and 72 are formed in Ausführungsbei ^¬ play as n-channel MOSFET. As nen to recognize, the gate terminals of these two Transis ^¬ motors 71 and 72 connected to the control unit 5, so that the control signal 6 is applied to this gate terminals. In the exemplary embodiment, the drain terminal of the transistor 71 is electrically connected to the output A. The source terminal of the transistor 71 is connected to the source terminal of the transistor 72, wherein the drain terminal of the transistor 72 to the input E is ver ^¬ bound. In addition, the switch 7 comprises a first diode 73 and a second diode 74.

In the exemplary embodiment, a radio interference suppression circuit 8 is electrically coupled to the switch 7. The radio interference suppression circuit 8 is designed to prevent or reduce a radio interference suppression and to dampen voltage spikes. The radio interference suppression circuit 8 in the embodiment has a resistor 81 and a capacitor 82, wel ^¬ che are connected in series. As can be seen, between the resistor 81 and the capacitor 82, a further switch 83 is arranged.

In the embodiment according to Figure 1 is at very nied ^¬ membered dimming settings, which are so small that it can come to restarting of the electronic transformer, an electronic separation of the electronic transformer 1 of the DALI dimmer possible. The dimming settings, which may require this re-starting, for example, less than 20 percent of ma imum ^¬ dimming, especially less than 10 percent of the maximum dimming level, in particular be less than 5 percent of the maximum dimming setting. If the gate terminals of the transistors 71 and 72 are controlled via the control unit 5 by means of the drive signal 6, these two transistors 71 and 72 switch through and a dimming of the mains voltage or the voltage supply of the electronic transformer 1 can be performed. In this state, when a control signal 6 is applied, the switch 83 is closed.

If no control signal 6 is applied to the gate terminals of the transistors 71 and 72, the switch 83 is opened. As a result, the radio interference suppression circuit 8 is separated from the switch 7 electronically. This can also prevents the mains voltage passes through a circuit node 75 of the switch 7 in the radio interference suppression circuit 8 and from there via a further circuit node 76 of the switch 7 to the output A of the switch 7 and thus to the elekt ^¬ tronic transformer. 1 Would this switch Thus, in the case of a non-driving of the gate terminals of the transistors 71 and 72 are not opened by the control signal 6, exactly over this signal path described above, the mains voltage would be passed with such a voltage value to the electronic transformer 1, which a steady restart condition, since this voltage would be above a first voltage threshold, which would also be greater than the starting voltage of the electronic transformer 1, in particular a DIAC. Through this continuing ^¬ lasting restart the undesirable Ge ^¬ räuschbildung would then be generated. The electrical Ent ^¬ the radio interference suppression coupling 8 of the switch 7 during a non-driving this switch 7 by the control unit 5, in which the switch was in this to ^¬ 83 of the non-driving is open, thus a recurrent restarts the electronic transformer and thus an unwanted ^{Geräuschbil ¬} tion can be prevented.

A further exemplary embodiment of the invention is shown in ^FIG . In contrast to the embodiment in Figure 1. Here, the radio interference suppression circuit 8 no switch 83, and is limited only by the number scarf ^¬ tung the resistor 81 and the capacitor 82 is formed. As can be seen in Figure 2, a circuit branch 9 is connected in parallel to the electronic ^¬ African transformer 1, which is connected to the circuit nodes 93 and 94. The circuit branch 9 comprises in the ^exemplary embodiment egg ^¬ nen switch 91 and a resistor 92. The resistor 92 may be formed as an ohmic resistance or as a Zener diode. By that shown in FIG Embodiment can again be prevented in the state of a non-drive (no control signal 6 is applied to the gate terminals of the transistors 71 and 72) a recurrent restarting of the electronic transformer 1 and thus an associated noise. In the embodiment shown in Figure 2, the switch 91 is closed in the circuit branch 9 in the state of non-driving of the switch 7 and thus ^{¬ shorted} to the output A of the switch 7 by the load or the resistor 92 and thus the output voltage at the output A. of the switch 7 is limited to values which are below the voltage threshold. The voltage threshold value can be predetermined such that it is below a starting voltage of the electronic transformer. If the electronic transformer 1 has a DIAC as a starter, then the first voltage ^threshold value can be predetermined with a value which is approximately 33V or less than 33V, since the starting voltage of such DIACs is approximately at 33V. Due to the configuration in Fi gur 2 can also be a very effective and efficient approach can be provided with the loading ^¬ operating state, in particular the starting behavior of elekt ^¬ tronic transformer 1 may be optimized so that a continuous restart and thus one-forth Noise at very low dimming or switched off.

It can also be provided that the embodiments in FIGS. 1 and 2 are implemented together. The switch ^¬ ter 83 and / or the switch 91 may be implemented as TRIACs, which are controlled by an optocoupler. Instead of the DALI dimmer can also be provided that a potentiometer is provided for adjusting the dimming positions. It can be provided in principle any dimmer, which only "off" electronically.

Claims

claims

1. A circuit arrangement for controlling the operation of an e lektronischen transformer (1) whose voltage ^¬ supply dimmable, said electronic transformer (1) is electrically connected to an output of a switch (7) and the switch (7) by means of a control unit (5 ) is controllable, wherein a radio interference suppression circuit (8) is coupled to the switch (7) and dependent on one of the switch

(7) applied control state for controlling the starting behavior of the electronic transformer

(1) the radio interference suppression circuit (8) from the switch

(7) separable and / or the output (A) of the switch

(7) is short-circuitable.

2. Circuit arrangement according to claim 1, characterized in that the radio interference suppression circuit (8) can be disconnected from the switch (7) and / or the output (A) of the switch (7) can be short-circuited when the control state applied to the switch is interrupted by a non-contact switch. Actuation of the switch (7) by the control unit (5) char ^{¬ is} risiert.

3. A circuit arrangement as claimed in claim 1 or 2, characterized in that the radio interference suppression circuit (8) can be disconnected from the switch (7) and / or the output (A) of the switch (7) can be short-circuited if a dimming position of the supply voltage is less than 20 percent, in particular less than 10 percent, in particular less than 5 percent, of a maximum dimming position.

4. Circuit arrangement according to claim 3, characterized in that the dimming position can be predetermined by a DALI dimmer, which is electrically connected to the control unit (5).

5. Circuit arrangement according to claim 1 or 2, characterized in that the radio interference suppression circuit (8) of the switch (7) separable and / or the output (A) of the switch (7) is kurzschließbar when the electronic transformer (1) is turned off ,

6. Circuit arrangement according to one of the preceding claims, characterized in that the radio interference suppression circuit (8) has a switch (83) and the radio interference suppression circuit (8) of the switch (7) for switching on and off of the electronic transformer (1) by the other Switch (83) is separable.

7. Circuit arrangement according to claim 6, characterized in that the radio interference suppression circuit (8) is a series circuit of a resistor (81) and a capacitor (82).

8. Circuit arrangement according to one of the preceding claims, characterized in that the output (A) of the switch (7) via a circuit branch (9) is short-circuited, which is connected in parallel to the electronic transformer (1).

9. Circuit arrangement according to claim 8, characterized in that the circuit branch (9) has a switch (91) and egg ^¬ NEN resistor (92).

10. A method for operating control of an electronic transformer (1) whose power supply is dimm ^¬ bar, wherein the electronic transformer (1) with an output (A) of the switch (7) is electrically connected and the switch (7) by means of a control unit ( 5 is controlled), wherein a radio ^¬ suppression circuit (coupled to the switch (7) 8), and depending on a voltage applied to the switch (7) control state for controlling the starting behavior of the electronic transformer (1) the radio interference suppression circuit (8) of the Switch (7) is disconnected and / or the output of the switch (7) is shorted.