The classification and choice of power supply LED
There are many kinds of classification methods of power supply:
According to the different output divided into constant voltage, constant current;
According to the characteristics of the input divided into general series, and high power factor series;
According to different purposes is divided into waterproof series, and is not waterproof series; According to the circuit structure is divided into different series of isolated, and not isolated series;
According to the control mode Divided into control mode adjustable light series, and adjustable light series.
LED has numerous advantages，in that case, environmental protection, long service life, photoelectric conversion efficiency, The LED life in the 10 Million hours Above But in the actual application process, Because of the design of driving power supply and driving mode selection is improper, or with LED Light does not match, draw the LED to damage or decay, Reduced LED The reliability of the lamp. Due to Different LED Manufacturers and LED specifications，output Current and Voltage also are different Now with white light LED for Cases,
In accordance The variation rules of the current and voltage. In general application of forward voltage 3.0-3.6V About, The typical value of voltage 3.3V Current 20mA,
When forward voltage more than 3.6V After The forward voltage is very small increase , LED The positive power Flow may have doubled up, draw the LED body temperature rise too fast
To accelerate LED Optical attenuation and Make LED Life shortening. Even be likely to burn LED.
According to the variation characteristics of LED Voltage, current。Put forward strict requirements on the design of driving power supply。