What are the LED driving methods?
|LED lights are not able to directly use the conventional mains grid voltage. Due to the characteristics of LED light sources, in order to meet the special voltage and current requirements of LEDs, specially designed voltage conversion equipment must be used in order to make the LEDs work normally, so the LED lamps There is a power drive that is different from traditional luminaires.|
LED lamp power supply is driven by a constant current drive power supply and a regulated drive power supply. The output current of the constant current drive circuit is constant, and the output DC voltage varies within a certain range according to the magnitude of the load resistance. The load resistance is small, the output voltage is low, the load resistance is larger, and the output voltage is also The higher. The constant current circuit is not afraid of load short circuit, but it is forbidden to completely open the load. It is desirable to drive the LED with a constant current drive circuit, but it is relatively expensive. Attention should be paid to the maximum withstand current and voltage values used, which limits the number of LEDs used.
When the parameters in the voltage regulator circuit are determined, the output voltage is fixed, and the output current changes as the load increases or decreases. The voltage regulator circuit is not afraid of the load open circuit, but it is forbidden to completely short the load. The LED is driven by a regulated drive circuit, and each string needs to be coupled with a suitable resistor to make each string of LEDs display brightness average.