The luminous principle of LED is to add forward voltage at both ends of it

by:MOSO     2020-03-01
LED driver design idea; The position of LED backlight in portable products has been unshakable. Even in the backlight of large-size LCD, LED has begun to challenge the mainstream position of CCFL; In the field of lighting, LED, as the key component of semiconductor lighting *, is sought after by the market for its energy saving, environmental protection, long life, maintenance-free and many other halves. The driving circuit is an important part of LED products. No matter in the fields of lighting, backlight or display panel, the selection of the technical architecture of the driving circuit should be matched with the specific application. The light-emitting principle of LED is to add forward voltage at both ends of the LED to compound the minority carriers and majority carriers in the semiconductor, releasing excess energy, thus causing photon emission. The main function of the LED drive circuit is to convert the AC voltage into a constant current power supply, and at the same time complete the matching with the voltage and current of the LED according to the requirements of the LED device. In addition to meeting the safety requirements, the LED drive Circuit should have two basic functions: first, keep the constant current characteristic as much as possible, especially when the power supply voltage changes by 15%, it should still be possible to keep the output current within the range of 10%. When using LED as display or other lighting equipment or backlight, it needs to be driven by constant current. The main reasons are: 1. Avoid driving current exceeding * large rating value, which affects its reliability. 2. Obtain the expected brightness requirements and ensure the consistency of brightness and chromaticity of each LED. Second, the drive circuit should keep its own power consumption low, so as to keep the system efficiency of LED at a high level. PWM (Pulse width modulation) Technology is a traditional dimming method. It uses simple digital pulses to repeatedly switch LED drivers. The system only needs to provide wide and narrow digital pulses, the output current can be simply changed to adjust the brightness of the LED. The advantage of this technology is that it can provide high-quality white light, simple application and high efficiency, but a fatal disadvantage is that it is easy to generate electromagnetic interference and sometimes even generate noise that can be heard by human ears. In addition, our company also sells switching power supply, power supply module and other products. The company has * actual combat technology and professional operation team to create services based on user experience for you, the perfection of service is our endless pursuit. Because people-oriented, so trustworthy; Because of professional full-time, it is worth choosing; Looking forward to your call negotiation!
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