LED Drivers & Power Supplies

Vanliga frågor

Vilken transformator behöver ett LED-band?

Transformatorn ska ha samma spänning som LED-bandet, alltså en 12 V-transformator till 12 V-band och en 24 V-transformator till 24 V-band. Välj en effekt som är 20–30 % högre än bandets totala effekt.

Hur räknar jag ut transformatorns effekt?

Multiplicera bandets effekt per meter med antalet meter, till exempel 5 m × 10 W/m = 50 W. Då passar en transformator på 60–65 W.

Vilket är bäst, 12 V eller 24 V?

24 V passar för längre sträckor eftersom spänningsfallet blir mindre. 12 V är vanligt i korta möbelbelysningar och i äldre system.

Går det att dimra en LED-transformator?

Ja, om du väljer en dimbar modell: TRIAC för vanliga väggdimrar, DALI och 1–10 V för styrsystem och Push Dim för tryckknapp. Med en RF-dimmer räcker en vanlig transformator.

Behövs en särskild transformator utomhus eller i badrummet?

I fuktiga utrymmen och utomhus väljer du en IP-skyddad transformator, utomhus IP67.

Vad är skillnaden mellan transformatorer med konstant ström och konstant spänning?

Transformatorer med konstant spänning (12/24 V) är till för LED-band. Transformatorer med konstant ström är till för downlights och spotlights, när produktinformationen anger att det krävs.

Choosing an LED power supply – voltage, power and dimming

Choosing the right product starts with the application, the dimensions and technical compatibility. This guide helps you compare the options before ordering.

Constant voltage or constant current?

LED strips often use a constant voltage power supply, for example 12 V or 24 V. Many LED downlights and modules, on the other hand, require a specific constant current, such as the milliamp value stated by the manufacturer. These types of power supply cannot be used interchangeably. Check the technical requirements of the luminaire or strip before ordering.

12 V, 24 V and 48 V

The output voltage of the power supply must match the rated voltage of the LED load. In a 24 V system the current is lower than in a 12 V system at the same power, which can make voltage drop easier to manage. 48 V options are used for certain longer runs. Never connect a 12 V strip directly to a 24 V power supply.

How much power is needed?

Calculate the total power of an LED strip by multiplying the strip's W/m value by the length used. For example, 10 metres of 10 W/m strip means a nominal load of 100 W. Choose a power supply whose continuous power, together with the safety margin required by the manufacturer, is sufficient for the load. Also take into account any power derating caused by the ambient temperature.

Dimmable power supplies

TRIAC, DALI, PUSH DIM and 0–10 V are different control methods. A dimmable power supply is chosen according to the control system in use and the LED load. Not all DALI power supplies support all DALI functions, and an ordinary ON/OFF power supply does not become dimmable with a separate mains dimmer without compatibility.

IP rating, installation and connections

The power supply's IP rating, operating temperature, cooling and installation method are chosen according to the environment. In damp spaces and outdoors, the protection of the connections must also be considered. Check the input voltage, connector type, physical dimensions and any enclosure required. Fixed mains electrical connections must be made by a qualified electrician.

Compatible products and accessories

Check model-specific features and compatibility in the product information. See also:

• 24 V power supplies
• 12 V power supplies
• Constant current drivers
• DALI control

Frequently asked questions

Which LED power supply is suitable for a 24 V strip?

A 24 V constant voltage power supply whose continuous power and other specifications match the load of the strip.

Can an overpowered power supply be used?

A sufficient power reserve is a good thing, but also check the power supply manufacturer's load and operating instructions.

What is the difference between a CV and a CC power supply?

CV keeps the voltage constant, while CC regulates the current to match the luminaire's requirement.

Can an LED power supply be dimmed?

Only if the selected power supply, or the control system connected to it, supports the desired dimming method.