Many friends are often blindfolded in front of designers or owners. Because of the development of LED lighting and the emergence of new concepts, many people have already been confused. Just call them the same, and comfort yourself afterwards. Look at their shape, "function "Aren't they all the same?
1.Ballast
There are currently two types of ballasts commonly used, namely inductive and electronic ballasts, which are used for gas fluorescent tubes. Although they are connected to the input end of the lamp like the LED lamp system, the working principle and function are completely the same.
2.Transformer
China LED transformer supply to share with you: The concept of transformer mainly appears in the application of quartz lamps (halogen lamps), the main role is to reduce 220V AC power to 12V AC voltage for the lamp cup, please note: The output voltage is still AC, while LED drive (current mainstream DC drive) is DC output. In addition, this transformer can also be used for some LED lamp cups.
3. What is the LED driver?
LED driver (here refers to DC LED only), this magical term that was hyped up in the rise of the LED industry, in fact, those who specialize in electronic circuits know that LED driver circuits are not complicated and belong to entry-level circuits.
LED drive is divided into constant current drive and constant voltage drive. First of all, a basic concept of LED drive is to convert 220V AC power into a usable DC voltage for the LED (generally 3-110V). The so-called constant voltage drive means that the output voltage is constant and the current is constant. Variable, such as our common switching power supply for decorative light strips, which has the advantage of being able to arbitrarily connect multiple light strings in parallel (within the specified current), the larger the power, the lower the cost, the disadvantage is that the life of the LED has a greater impact, so we see The tags obtained are like this: the output voltage is constant (usually 12V / 24V), and the current and output power are selectable.
Constant Voltage Led Driver
The so-called constant voltage led driver is that the output current is constant and the voltage is variable. For example, our common LED downlights, spotlights, and drivers inside the lamp tube have the advantage that they can be well adapted to LED lights. The working current environment required by the beads. According to the use environment can be divided into indoor, outdoor, bare boards.
At present, the most commonly used output current of indoor LED drivers is about 300mA. If the output accuracy of the driver is sufficient, the service life of the lamp beads will be guaranteed, just like a car that runs at a constant speed is more fuel efficient. parameter.
It can be seen that there is a fundamental difference between LED driving and transformers and ballasts.
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