Two major categories, rounding LED drive power supply

LED drive power is the power supply is converted into a certain voltage current to drive the LED voltage converter, typically LED drive power supply input includes high voltage ac power frequency ( The mains) Dc, high-voltage direct current, low voltage, low voltage high frequency ac ( Such as electronic transformer output) And so on. And the output of the LED driver power supply are mostly can change with LED positive pressure drop values and change the voltage of the constant current source.

for a variety of different specifications of the LED power conversion efficiency and performance of each are not identical, so choose a suitable and efficient LED dedicated power supply, can truly reveal the LED light source characteristics of the highly effective. Because of the low efficiency of the LED power supply itself need to consume large amounts of electric energy, so in the process of to the LED power supply can't highlight LED energy-saving features. In a word, LED LED power supply in the work of the stability, energy saving, longevity, have important role.

what are the power of the LED classification?

A, LED power supply drive mode can be divided into two categories according to the

A. Voltage type

1, the voltage regulator circuit after the various parameters, output is fixed voltage, output current increased as the load increase and decrease of the

2, although regulating circuit is not afraid of open load, but it is forbidden to load short circuit completely

3, after the rectifier voltage change will affect the brightness of the LED

4, to make every string with regulating circuit drive LED display brightness even, need to add the appropriate resistance to

B. Constant flow

1, LED constant current drive circuit drive is ideal, the downside is that high prices

2, although not afraid load short circuit constant current circuit, but it is forbidden to load completely open

3, constant current drive circuit of the output current is constant, and the output of dc voltage is different with the size of the load resistance within a certain range change

4, to limit the number of the use of LED, because it has the maximum current and voltage value

2, LED power supply can be divided into six types according to the circuit structure

1, conventional step-down transformer

this power source has the advantage of small volume, deficiency is heavy in weight, and power efficiency is low, generally in 45% ~ 60%, because of the reliability is not high, so general rarely used. , capacitance step-down

2 this way the LED power supply are vulnerable to the influences of grid voltage fluctuation, low power efficiency, should not be LED in the use of flash, because circuit by capacitance step-down, when used in flash, as a result of the action of charge and discharge, through the LED current is great, easy to damage the chip.

3, electronic transformer step-down

this deficiency is the conversion efficiency is low, the power source structure voltage range narrow, general 180 ~ 240 v, moire interference. Step-down

4, resistance this way of electricity power efficiency is very low, and the system also have less reliable. Because circuit through a resistor step-down, by the interference of power grid voltage change is bigger, it is not easy to make it regulated power supply, and step-down resistance itself consumes a large portion of the energy.

5, RCC step-down switch power supply

this way LED power advantage is voltage range is wide, power efficiency is higher, generally in 70% ~ 80%, and widely used. Faults mainly switch frequency is not easy to control, load voltage ripple coefficient is larger, abnormal situation load adaptability is poor.

6, PWM control switch power supply

at present, the design of PWM control mode of LED power supply is ideal, because this kind of switch power supply output voltage or current is stable. The power conversion efficiency is extremely high, generally can be as high as 80% ~ 90%, and the output voltage and current is very stable. This type of LED power supply is mainly composed of four parts, respectively is input rectifier filter parts, the output rectifier filter, PWM voltage stability control part, switch part of energy conversion. And this kind of circuit has perfect protection, belongs to the high reliability of power supply.

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