LED Drivers & Power Supplies

Usein kysytyt kysymykset

Millainen muuntaja LED-nauhalle tarvitaan?

Muuntajan jännite on sama kuin LED-nauhan, eli 12 V nauhalle 12 V muuntaja ja 24 V nauhalle 24 V muuntaja. Teho valitaan 20–30 % nauhan kokonaistehoa suuremmaksi.

Miten lasken muuntajan tehon?

Kerro nauhan teho metreillä: esimerkiksi 5 m × 10 W/m = 50 W. Sopiva muuntaja on silloin 60–65 W.

Kumpi on parempi, 12 V vai 24 V?

24 V sopii pidempiin vetoihin, koska jännitehäviö on pienempi. 12 V on yleinen lyhyissä kalustevaloissa ja vanhoissa järjestelmissä.

Voiko LED-muuntajaa himmentää?

Kyllä, kun valitset himmennettävän mallin: TRIAC tavallisille seinähimmentimille, DALI ja 1–10 V ohjausjärjestelmiin, Push Dim painonapille. RF-himmentimen kanssa riittää tavallinen muuntaja.

Tarvitaanko ulos tai kylpyhuoneeseen erityinen muuntaja?

Kosteisiin ja ulkotiloihin valitaan IP-suojattu muuntaja, ulkokäyttöön IP67.

Mikä ero on vakiovirta- ja vakiojännitemuuntajalla?

Vakiojännitemuuntaja (12/24 V) on LED-nauhoille. Vakiovirtamuuntaja on alasvaloille ja spoteille, joiden tuotetiedoissa sitä vaaditaan.

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.