GUANGZHOU, China -- How to choose a better LED driver?

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LED driver is a transfer from city electricity to a voltage or current we need, how to choose a good driver, there are some points we need to notice.Usually the input often is city electricity（High voltage high frequency ac）， Low voltage, high voltage direct current, low voltage high frequency ac dc， Such as the output of electronic transformer.

There are two most important to purchase drive:

A: To notice the capacitance brand, such as Ruby (Rubycom Japan) particularly prominent, Hengying (HY domestic) are common,of course price will more expensive than other discomfort brand capacitance.

B: Whether or not to bring a IC control chip, IC control chip has a short circuit, over voltage, overload, over temperature protection function.

As long as the two achievements of driving power, quality is very good.

General principles:

A, According to characteristics of the LED current and voltage, constant current driver will be better.It can avoid the LED forward voltage caused by the change of the current change, at the same time constant current can bring a stable brightness of the LED light.

B, On the other hand, LED luminous flux is inversely proportional to the temperature, so when design the driver should try to reduce the work temperature and good cooling system to reduce the LED working environment temperature.

C, In order to guarantee the whole life of LED products, the LED junction temperature must be controlled in a certain range, which is to control the work environment temperature of the LED products.

1, High reliability

LED products mainly compose of LED chips and power supply, cooling case, control circuit, etc. The LED power supply quality directly affect the quality of the product.Especially the LED street light ,in a high place, maintenance is not convenient, the cost of maintenance is also big.

2, High efficiency

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Led are energy saving products, power supply also need energy saving, especially important the power supply installed inner the lamps structure.

Because the LED luminous efficiency drop with the rising of temperature. High efficient power supply , power consumption is small, temperature will little, also lower the temperature of lamps and lanterns. Good for LED life span and the LED light failure.

3,Constant current drive mode

To cooperate the volt-ampere characteristics of leds, so the LED power supply must use constant current driver.

4, Surge protection

LED impact resistant ability is poor, so should strengthen the protection of this aspect.In particular, some in outdoor products, power grid load start-stop and lightning strike will have impact on the power supply.So the LED driver power supply input terminal to stifle the surge protection circuit, avoid switch instant damage the LED.

5, The temperature protection function

Power supply except the conventional protection function, it is better to add a LED chip temperature feedback structure in the constant current output , to protect the LED chip p-n junction temperature is not too high.

6, LED power life

To improve life of LED drive power supply, it is need in many ways to improve.Use the long life capacitance, improve the efficiency of power supply. Do a good job in the power of heat dissipation function, optimize the thermal design of lamps and lanterns.The LED power belongs to the switching power supply,Switching power supply quality and reliability depends on the circuit design, manufacturing process, and the quality of the device.Electrolytic capacitor is indispensable part of the high-power switching power supply.And the normal working life of switch power supply depends on the service life of electrolytic capacitor used by power supply,The life of the electrolytic capacitor is determined by the life and working temperature of the capacitor again,Electrolytic capacitor work under different temperature , the difference of life is very big.

7, Work environment

Because of the different environment in different region, need important consider the workplace environment of the LED lamps and lanterns.

Such as temperature, humidity, installation location, etc.

Considering the work style of the power supply.If not add soft start circuit,when electric moment,the output would have a voltage spikes,to better protect the LED, so add soft start circuit is a key of LED driver quality stability.

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