Wie schließe ich meine dimmbaren LED-Streifen an?

Es gibt mehrere Möglichkeiten LED-Streifen zu dimmen . Doch wie unterscheiden sich die einzelnen Dimm-Verfahren? Nachfolgend beschreiben wir wie bereits dargestellt die einzelnen Verfahren im Detail und stellen den Aufbau der verschiedenen Systeme dar. Übersicht der Dimm-Konzepte für LED-Bänder Konventionell dimmbare Trafos Trafos mit externem Steuersignal Festspannungstrafo mit zusätzlichem PWM-Dimmer LED Trafos mit integriertem PWM-Dimmer

Dim LED strips - dim LED strips correctly

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Dimming LED strips - many possibilities

While incandescent bulbs can be dimmed relatively easily by reducing the voltage, this is no longer that easy with LED strips. LEDs are electronic components, so-called semiconductors, and require a certain voltage to light up. Nothing happens under this threshold value, and only at a certain voltage level the brightness does suddenly increase. It is done by current control, realized via other electronic components. These convert the input voltage into an analog current for the LEDs, so that the following dimming variants are possible.

Variant 1 - voltage variation

The operating device for e.g. 12V or 24V is reduced in the output voltage.

Variant 2 - PWM dimming

The operating voltage is switched on or off for different periods (Pulse Width Modulation).
The operating devices must be aligned accordingly, depending on the various control options on the user side.

Option 1 - The transformer itself is conventionally dimmable.

Special dimmable LED transformers can be used with commercial leading/ trailing edge dimmers. These are often already available. Here, the LED transformer is switched directly after the phase dimmer. The LED strips are then simply connected to the LED transformer. This solution is often used if only the existing three lines (L, N, PE) are available in the house installation. Disadvantage: limited dimming range.

Option 2 - Transformer can be dimmed via external control cable

Some manufacturers offer LED transformers with an additional control input. The output voltage can be changed or switched via a control voltage such as 1-10V, a potentiometer, a DALI signal or a PWM signal. The principles are different and depend on the respective type. This solution is also often combined with radio modules(e.g. Casambi)
Dimmable transformers are particularly suitable if the LED strips have only one light colour.

Option 3 - Fixed voltage transformer with additional PWM dimmer

This variant offers maximum flexibility and is also suitable for retrofitting in existing installations. The additional PWM dimmer is installed between the power supply and the LED strips. The desired degree of dimming can be set in many different ways (DALI, push-button, 1-10V, wireless, Bluetooth, WLAN with additional module). Not only single-colour but also multi-colored (DUAL-White, RGB, RGBW) LED strips can be controlled.

Option 4 - LED transformers with integrated PWM dimmer

These are LED transformers where the dimming level can be set directly via the DALI or DMX interface. The LED transformer is supplied directly with the power supply (230V). The LED strips are also connected to the LED transformer. The advantage here is that only one component is required for dimming. It is controlled via the integrated DALI or DMX interface.

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How do I connect my dimmable LED strips?

There are several ways to dim LED strips. But how do the individual dimming processes differ?
In the following we describe the individual procedures in detail and present the structure of the different systems.

Overview of dimming concepts for LED strips

Conventionally dimmable transformers
Transformers with external control signal
Fixed voltage transformer with additional PWM dimmer
LED transformers with integrated PWM dimmer

1. Conventionally dimmable transformers

This form of dimming is particularly suitable if as little change as possible is to be made to the existing house installation. Existing leading/ trailing edge dimmers can still be used for this purpose. The dimmed AC voltage supplies the LED transformers, which are especially suitable for conventional dimming. The LED strips are then connected directly to the LED transformers, so this method is suitable for using a single light colour.

If, for example, an existing dimmable lighting is to be converted to LED strips, in the simplest case only the LED transformers and the LED strips would have to be retrofitted. It should be noted, however, that the LED strips can only be dimmed down to a certain percentage value, since the power required by the transformers is obtained from the dimmed AC voltage.

2. Transformers with external control signal

With this method the dimming takes place directly in the transformers. In this case, the LED transformers are normally connected to mains voltage. In order for the desired brightness to be set, an external dimming signal must be supplied to the transformers. The LED strips are then connected directly to the LED transformers.

The dimming signal can be provided wired (DALI, 1-10V, resistance, PWM signal) as well as wireless (e.g. via Casambi Bluetooth) to the LED transformers. Dimmable transformers are particularly suitable if the LED strips have only one light colour. In order to achieve an optimum result with LED transformers of e. g. Meanwell type HLG in version "B", the rated power of the transformers should be used as well as possible. If, for example, the LED strips need 36 watts, a 40 watt transformer should be used instead of a 60 watt one for a good dimming result.

3. Fixed voltage transformer with additional PWM dimmer

The modular design of this variant ensures maximum flexibility and easy retrofitting. This structure consists of separate LED transformers and independent PWM dimmers. The LED transformers supplied with mains voltage generate the required DC voltage and supply the downstream PWM dimmers.In this version, the LEDs are connected to the PWM dimmers. The dimming signal can be fed to the individual dimmers in various forms (DALI, push-button, 1-10V, Bluetooth, radio, Wlan with additional module).

The PWM dimmers are available in different versions for single and multi-coloured LED strips such as Dual-White or RGB (W). Existing systems can easily be retrofitted with a dimming function by inserting a corresponding PWM dimmer between the LED transformers and the LED strips. With appropriately dimensioned transformers it is also possible, for example, to operate several dimmers on one transformer in order to enable a common switch-on and simultaneously use different dimming methods (monochrome/multi-coloured, different controls).

4. LED transformer with integrated PWM dimmer

In this design, the LED transformers and the PWM dimmers are combined into common units. The advantage here is that only one component is required for the power supply and dimming. The LED transformers with integrated PWM dimmer are directly supplied with mains voltage and simultaneously receive the control signal required for dimming (DALI, DMX).
The LED strips are connected directly to the LED transformer with integrated PWM dimmer. This design also allows the use of multi-coloured LED strips. This variant stands out due to the simple wiring and the space-saving design with full functionality!