LEDs are characteristic-sensitive semiconductor components with negative temperature characteristics, so stable operation and protection are required during application, resulting in the concept of driving. The driver is the core component of the LED strip and plays an important role in the work of the LED. LED strip drivers are generally divided into two types: AC drivers and DC drivers.
Unlike ordinary lighting bulbs, LED light strips can be directly connected to 220V AC power, so there are strict requirements for driving power. Although LED light strips also have high-voltage light strips that can be directly connected to 220V, we often use 5-24V daily. Because it is a low-voltage drive, it is necessary to design a complex conversion circuit, and must have LED strips of different specifications and different power adapters.
AC drives are classified into three circuit types: buck, boost, and inverter according to the application. In addition to the need to rectify and filter the input AC power, the difference between AC drives and DC drives also has the problem of separation and non-separation from the perspective of safety.
LED flexible light strip DC drivers can be divided into three types according to their functions and uses.
1. Inverter driver. The high-frequency transformer of switching element is used to realize the transmission of energy from primary to secondary, and the voltage/voltage conversion is performed to drive the light-emitting diode at the same time. The voltage at the output of such a driver is not limited by the input voltage, and can be arbitrarily designed with the number of LED strips connected in series as required. The application is flexible, and it is suitable for the situation where the supply voltage fluctuates around the voltage drop of the load tube. When the difference in pressure drop of the load tube is large.
2. DC boost driver. Its basic principle is to work by combining switching elements and reactive elements to accumulate energy to accumulate boost and limit current. The conversion efficiency of the boost driver is also relatively high. Its significant advantage is that it will not damage the light-emitting tube when it fails itself. Boost drivers are only available when the voltage drop across the load tube is always higher than the supply voltage. When the voltage of the load tube drops below the power supply voltage, the driver is out of control, and the large current passes through the light-emitting tube to burn the light-emitting tube.
3. DC buck driver. The basic principle is that the combined switching element and the reactive element apply a step-down limit to the external power supply, and then drive the light-emitting tube to operate. The series buck driver has a simple structure and high conversion efficiency. The main disadvantage of this driver is that when the main switching element is damaged, the large current will directly burn the LED through the LED. Obviously, this method cannot be used when the supply voltage is lower than the load tube.
In the case of a small number of LED strips used when the DC low voltage input is used, a buck driver or a boost driver can be selected, and a series or fewer parallel LED strips can be selected as much as possible. When the number of light strips is large, a boost driver should be selected, and try not to connect in series or less in parallel. LED light strip) driver is one of the core components of the overall light strip. If you choose a good driving light strip, the luminous efficiency and lifespan will be greatly improved, so friends must also conduct detailed inspection and understanding when choosing and purchasing.
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