12V LED Transformer

12V LED Transformer

Operating LED-Stripes or -Lamps on a 12V LED Transformer

The most common use of these 12V transformers in their electronic version (called EVG) is the operation of LED spots as a replacement of halogen spotlights. In most cases, because of the required minimum load of a 12V halogen transformer, LED spotlights can not be used. Only special LED transformers can provide the needed 12V DC or AC voltage for LED lights at minimum electrical power.

 

Dimmable LED transformers

Should dimming be preserved, all three components have to fit together. The LED has to be dimmable, the 12V LED transformer needs to be suitable for dimming and also compatible to phase cut dimming. Because there is no standardized interface, it's worth looking at the compatibility table to avoid (e.g.) flickering. Basically, with this solution it may be necessary to compromise regarding the dimming comfort.

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Meanwell LPF-16 power supply 16W
Meanwell LPF-16 series
With a universal AC/DC input right up to 305V AC is the LPF-16 also suitable for LED's -and street lighting.
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Universal Multi LED control gear 25W with integrated Casambi Bluetooth interface
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MiniJolly MD 20
Trailing-edge/ leading-edge dimmer for constant current driver of 250mA - 900mA via DIP-Switch.
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Meanwell LPF-25 Power supply
Meanwell LPF-25 series
With a universal AC/DC input right up to 305V AC is the LPF-25 also suitable for LED's -and street lighting.
from 19,99 EURunit price 22,61 EURnet: 19,00 EUR
 
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Dimmable LED power supply 30W or 45W
12VDC or 4VDC and 30W or 45W - Dimmable DC power LED power supplies for example LED strips for operation via phase-on / section dimmers.
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LED power supply 30W IP20 Slim
30 Watt LED powersupply for 12V/24V LED applications indoor. Slim shape.
32,99 EURnet: 27,72 EUR
 
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Meanwell HLG-40H power supply

Meanwell HLG40H series

With a universal AC/DC input right up to 305V AC is the HLG40H also suitable for LED's -and street lighting.

from 27,85 EURunit price 31,54 EURnet: 26,50 EUR
 
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Meanwell NPF-40 power supply

Meanwell NPF series

With a universal AC/DC input right up to 305V AC is the NPF-40 also suitable for LED's -and street lighting.

from 22,49 EURunit price 25,47 EURnet: 21,40 EUR
 
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PWM-40W Output LED Supply for LED-Stripes
Meanwell Power Supply with PWM-Control
Perfect dimming of LED-Stripes with PWM.
from 24,28 EURunit price 27,49 EURnet: 23,10 EUR
 
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General information about dimmable LED transformers for the operation of LED retrofit lamps (low voltage, GU5.3, GU4, ..)

If dimmability is to be maintained, all three components must fit together. The LED lamp must be dimmable, the power supply unit 12V LED transformer must also be suitable for dimming, as well as be compatible with the leading or trailing edge dimmer. Since there is no standardized interface here, it is worth taking a look at the compatibility lists to avoid flickering, for example. In principle however applies that with this solution a compromise must be entered regarding dimming comfort. With this technology it is no longer possible to dim the usual dimming behaviour to just a few percent (100% - 1%).


For dimming via leading/trailing edge, use 12V LED transformers and AC (alternating current) lamps.
The reason for this is that the operating electronics of the dimmable LED power supply also require energy to generate stable LED current. Flickering or undefined shutdown is the result.

Accordingly, the operation of LEDs is increasingly based on pure LED solutions with Constant current sources. This in conjunction with controls via 1-10V, DALI, push-button dimming or via radio.


The right dimmable LED ballast for LED strips

When operating LED Stripes, on the other hand, there are now many possibilities using a 12V power supply. On our pages you will find a variety of suitable LED ballasts with different power ratings and control inputs, as well as dimming concepts. These are explained in brief below.

Dimmable LED 12V power supply and its variants

While incandescent lamps can be dimmed relatively easily by reducing the voltage, this is no longer as easy with LED strips. LEDs are electronic components, so-called semiconductors, and require a certain voltage to light up. Nothing happens below this threshold value and only at a certain voltage value does the brightness increase abruptly. For this reason it is done via a detour over a current control, realized over further 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 LED operating device for e.g. 12V 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 control gear must be aligned accordingly and this depending on various control options on the user side..

 

Possibility 1 - The transformer itself is conventionally dimmable.

Special dimmable LED transformers can be used with standard phase 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 domestic installation. Disadvantage: Limited dimming range, as already known from retrofit solutions.

 

Possibility 2 - Transformer is dimmable via external control line

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

 

Possibility 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 strip. The adjustment of the desired dimming degree is possible by many different ways (DALI, push button, 1-10V, radio, Bluetooth, Wlan with additional module). With this version not only monochrome, but also multi-coloured (DUAL-White, RGB, RGBW) LED strips can be controlled.

 

Possibility 4 - LED transformer 12V with integrated PWM dimmer

This is an LED power supply unit in which the dimming level can be set directly via the DALI or DMX interface. The 12V power supply unit is supplied directly with the voltage supply (230V). The LED strips are also connected to the power supply. The advantage here is that only one component is required for dimming. Control is via the integrated DALI or DMX interface.


Do not hesitate to contact our experts for LED strips. We will be happy to advise you.

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Casambi Bluetooth Dimmer via phasecut
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