{"id":17576,"date":"2026-02-25T17:15:48","date_gmt":"2026-02-25T09:15:48","guid":{"rendered":"https:\/\/boqiled.com\/?p=17576"},"modified":"2026-02-25T17:15:50","modified_gmt":"2026-02-25T09:15:50","slug":"how-does-dali-work-in-constant-voltage-led-systems","status":"publish","type":"post","link":"https:\/\/boqiled.com\/fr\/how-does-dali-work-in-constant-voltage-led-systems\/","title":{"rendered":"How Does DALI Work in Constant Voltage LED Systems?"},"content":{"rendered":"

Lighting control can feel complex and overwhelming\u2014especially when you’re managing multiple zones or trying to sync lights with a smart platform.<\/p>\n\n\n\n

DALI works in constant voltage LED systems by sending digital dimming commands to compatible drivers, enabling precise brightness control, grouping, and automation through a standardized two-wire interface.<\/strong><\/p>\n\n\n\n

\"DALI
DALI in Constant Voltage System<\/figcaption><\/figure>\n\n\n\n

DALI isn’t just for fancy architectural lighting anymore. It’s becoming a go-to solution even in mainstream LED strip projects. In this guide, I’ll walk you through how it works in constant voltage setups and how we at BOQI design for it.<\/p>\n\n\n\n

Understanding DALI: A Digital Lighting Control Protocol?<\/h2>\n\n\n\n

Modern lighting needs more than just on and off. What if you could program moods, control groups, or automate scenes with a single wire pair?<\/p>\n\n\n\n

DALI is a two-way digital communication protocol used to control LED drivers and dimmers. It allows individual addressability, grouping, and scene-setting, all through a single control bus.<\/strong><\/p>\n\n\n\n

\"DALI
DALI protocol diagram<\/figcaption><\/figure>\n\n\n\n

DALI in Action<\/h3>\n\n\n\n

DALI (interface num\u00e9rique d'\u00e9clairage adressable)<\/a> was created to standardize lighting control across different manufacturers. It replaced analog 0-10V systems, which had many limitations in large-scale projects.<\/p>\n\n\n\n

Caract\u00e9ristique<\/th>0-10V System<\/th>DALI System<\/th><\/tr><\/thead>
Control Type<\/td>Analog Voltage<\/td>Digital Signal<\/td><\/tr>
Wiring<\/td>One wire per channel<\/td>Two-wire shared bus<\/td><\/tr>
Adressage individuel<\/td>Not supported<\/td>Supported (up to 64 devices)<\/td><\/tr>
Bi-directional Feedback<\/td>No<\/td>Yes<\/td><\/tr>
Scene & Group Control<\/td>Limited<\/td>Extensive<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

DALI<\/a>\u2019s major benefit is flexibility. You can reconfigure zones without rewiring, get feedback from drivers, and integrate with building management systems. This is crucial when controlling multiple constant voltage light zones, like in LED strip applications.<\/p>\n\n\n\n

What Is a Constant Voltage LED System?<\/h2>\n\n\n\n

When working with LED strips, you’ll often hear terms like 12V, 24V, and \u201cconstant voltage.\u201d But what exactly does that mean?<\/p>\n\n\n\n

A constant voltage LED system provides a fixed output voltage (e.g., 12V or 24V), and LEDs are designed to operate at that specific voltage. The driver controls current indirectly, often using PWM.<\/strong><\/p>\n\n\n\n

\"DALI
Constant Voltage LED system layout<\/figcaption><\/figure>\n\n\n\n

Components of a CV LED Setup<\/h3>\n\n\n\n

Constant voltage (CV) systems are especially common in LED strips and linear fixtures. Here’s what makes up the system:<\/p>\n\n\n\n

Typical System Components<\/h4>\n\n\n\n
Component<\/th>Role<\/th><\/tr><\/thead>
Constant Voltage Driver<\/td>Supplies fixed voltage (12V\/24V)<\/td><\/tr>
LED Strip<\/td>Accepts fixed voltage input, current limited internally<\/td><\/tr>
Dimming Control<\/td>Regulates brightness (often via PWM)<\/td><\/tr>
Controller (optional)<\/td>Interface for manual or remote control<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

This is different from constant current (CC) systems, where the driver regulates current directly and voltage may vary. CV systems are ideal for longer LED strips where LEDs are connected in parallel.<\/p>\n\n\n\n

How DALI Interfaces with Constant Voltage Drivers?<\/h2>\n\n\n\n

You might wonder: how does a digital protocol like DALI actually talk to a 12V or 24V driver?<\/p>\n\n\n\n

DALI interfaces with constant voltage drivers by sending digital commands to a DALI-compatible driver, which then adjusts output via PWM to control LED brightness.<\/strong><\/p>\n\n\n\n

\"DALI
DALI Interface with CV Driver<\/figcaption><\/figure>\n\n\n\n

Breaking Down the Connection<\/h3>\n\n\n\n

1. DALI Bus Connection<\/h4>\n\n\n\n

A DALI line carries data through a two-wire bus. This bus connects to all drivers, regardless of whether they’re constant voltage or constant current.<\/p>\n\n\n\n

2. Driver’s Internal MCU<\/h4>\n\n\n\n

The DALI driver has a microcontroller that decodes DALI commands. It reads instructions such as brightness level or scene ID.<\/p>\n\n\n\n

3. PWM Dimming Output<\/h4>\n\n\n\n

In CV systems, the driver maintains a stable output voltage but adjusts brightness by modulating the width of voltage pulses (PWM).<\/p>\n\n\n\n

Step<\/th>Action<\/th><\/tr><\/thead>
1<\/td>DALI signal sent from controller<\/td><\/tr>
2<\/td>Driver MCU decodes command<\/td><\/tr>
3<\/td>Driver adjusts PWM duty cycle<\/td><\/tr>
4<\/td>LED strip brightness changes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Because DALI is addressable, multiple drivers can be controlled individually or grouped\u2014even if they share the same power source.<\/p>\n\n\n\n

Dimming Mechanism: How DALI Regulates Output Voltage?<\/h2>\n\n\n\n

Traditional dimming lowers voltage, but that doesn’t work well with LED strips. So how does DALI handle dimming in constant voltage setups?<\/p>\n\n\n\n

DALI does not adjust the voltage itself. Instead, it uses the driver to vary the PWM duty cycle while keeping voltage constant, which effectively dims the LED output.<\/strong><\/p>\n\n\n\n

\"DALI
DALI PWM dimming mechanism<\/figcaption><\/figure>\n\n\n\n

Understanding PWM in DALI Dimming<\/h3>\n\n\n\n

Pulse-width modulation (PWM)<\/a> is the key mechanism for dimming in constant voltage systems. Here\u2019s how it works:<\/p>\n\n\n\n

Key Concepts<\/h4>\n\n\n\n