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Do you know the principle of solar lighting system? We will introduce LED light source and its driving technology
colorAccording to the International Commission on Illumination (CIE) publication “Colorimetry” and the Chinese National Standard GB 5698 “Color Terms”, color is an attribute of visual perception, which can be used in white, black, gray, yellow, red, green and other color names to describe. The light source color refers to the color of the light emitted […]
At present, there are many products of LED lights in different forms. The following is a brief introduction of various products. (1) LED lamp cupLED lamp cups are mainly used to replace light sources such as PAR lamps and energy-saving lamps used in downlight lighting. There are currently two main combinations. One type adopts low-power […]
1. The necessity of LED sortingIn the indication application stage of the LED development process, the main role of the LED is to be used for indicator lights or display lights, and generally appear as a single device. With the continuous improvement of LED luminous efficiency and brightness, the scope of its application continues to […]
(1) DimmingThe control of LED luminous intensity and color is usually called dimming and color adjustment. Since the luminous intensity IV (or luminous flux F) of the LED has a linear relationship with its working current IF within a certain current range, that is, as the current IF increases, the IV also increases at any […]
(1) Resistance current limiting circuitAs shown in Figure 1, the resistance current limiting drive circuit is the simplest LED drive circuit. It uses a series current limiting resistor in the loop to control the current flowing through the LED. The size of the resistance is determined according to the volt-ampere characteristics of the LED. However, […]
The current mainstream lighting LED lamps are composed of multiple low-power LED chips, which are connected in different combinations according to the design of the lamp, drive efficiency and application occasions. Usually, a driver is used to drive the LEDs in the entire lamp. (1) Series connectionSince LEDs are current-type devices, they are connected in […]
In view of the heat dissipation problem of high-power LED packaging, people have optimized the thermal system of the device in terms of packaging structure and materials. The early successful package structure is the AlGalnN power flip chip structure. Since the LED chip is flip-chip connected to the silicon substrate through bumps, the heat does […]
Packaging is an important part of the entity that constitutes the LED device. Although the LED package and the package of semiconductor discrete devices such as transistors have the functions of protecting the chip from the external environment and improving the thermal conductivity of the device, the LED package has great special characteristics. The important […]
①Causes of heating of LED devicesLike traditional light sources, LEDs also generate heat when they work. Under the action of an external electric field, the electrons in the N-type semiconductor gain energy to overcome the potential barrier at the PN junction and recombine a large number of holes in the P-type semiconductor. After recombination, the […]
①Voltage current characteristics of LEDThe volt-ampere characteristics of LEDs are shown in Figure 1, which is roughly the same as that of ordinary semiconductor diodes. It can be approximated that the current I is proportional to the nth power of the voltage U. When the voltage U is small, the current I is mainly a […]