When designing UVLED drivers, the appropriate driver method should be selected according to the requirements of power size, application occasion, driving performance, and economy. If the driving source performance does not match UVLED expected. This article summarizes several commonly used driving methods. UVLED constant voltage driver UVLED constant voltage source is defined as the output voltage is constant when the allowable load is constant, and it will not change with the change of the load (output current). In fact, the voltage output of constant voltage sources still has a certain ripple. It can be seen from the UVLED Voldemort characteristics that UVLED work in a non -linear area. The tiny voltage changes will cause a large current of UVLED. , High accuracy to the drive source. Figure 1 shows the local I-V curve chart of a UVLED. Figure 1 UVLED driver UVLED constant current source is characterized by the constant output current, which does not change due to changes in the load (output voltage). The constant current driver is generally divided into linear constant current and switching constant current. The switching constant current is widely used in high -power UVLED surface sources and wire light sources due to high efficiency and good stability. Figure 2 shows the basic frame diagram of a constant current driving solution. Figure 2 When designing the UVLED driver scheme, regardless of the use of constant voltage or constant current driver, in order to improve the reliability of the system, various protection measures are needed, such as overload protection, over temperature protection, etc.
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