LED drive power is a power converter that converts the power supply into a specific voltage and current to drive the LED to emit light. Generally, the input of the LED drive power includes high-voltage power frequency AC (that is, commercial power), low-voltage DC, high-voltage DC, low-voltage high Frequency AC (such as the output of electronic transformers), etc. The output of the LED drive power supply is mostly a constant current source that can change the voltage as the LED forward voltage drop changes.
There are two most important points to buy drive power
One: Be sure to identify the brand of the capacitor. Among them, Ruby (Rubycom Japan) is particularly well-known, and Hengying (HY-made) is more common. Of course, the price is a few cents more expensive than other unsuitable brand capacitors.
Two: Whether to bring IC control chip, because IC control chip has protection functions such as short circuit stop, overvoltage, overload, overtemperature and so on.
As long as the drive power is in place at these two points, the quality is already very good.
The characteristics of the power consumption of the network, the requirements of the LED characteristics and related LED products, the following points must also be considered when selecting the LED driving power supply:
General principle
a. According to the characteristics of LED current and voltage, it is ideal to use constant current drive. It can avoid the current fluctuation caused by the change of the LED forward voltage, and the constant current makes the brightness of the LED stable.
b. In addition, the LED luminous flux is inversely proportional to the temperature, so the heat of the power supply and the well-designed heat dissipation system should be minimized during use. Thereby reducing the ambient temperature for LED operation.
c. In order to ensure the overall life of LED products, the junction temperature of the LED must be controlled within a certain range, that is, the working environment temperature of the LED product must be well controlled.
1 High reliability
LED products are mainly composed of LED chips and power supply, heat dissipation shell, control circuit and so on. The quality of the LED power supply directly affects the quality of the product. Especially for LED street light products, because they are installed at high altitude, maintenance is inconvenient and the cost of maintenance is also large.
2 High efficiency
LEDs are energy-saving products, and the drive power must also meet the energy-saving requirements. Especially the structure where the power supply is installed in the lamp is particularly important. Because the luminous efficiency of LED decreases with the increase of LED temperature. The efficiency of the power supply is high, its power consumption is small, and the heat generated in the lamp is small, which reduces the temperature rise of the lamp. It is beneficial to delay the light decay of LED.
3 Constant current drive method
In order to match the volt-ampere characteristics of the LED, the LED power supply must use a constant current drive.
4 Surge protection
LED's impact resistance is relatively poor, so we must strengthen protection in this regard. Especially for some products installed outdoors, the start and stop of grid load and lightning strike will have an impact on the power supply. Therefore, the input end of the LED drive power supply must have a surge suppression circuit to prevent the switch from damaging the LED instantly.
5 Temperature protection function
In addition to the conventional protection function of the power supply, it is best to increase the LED chip temperature negative feedback in the constant current output to prevent the LED chip PN junction temperature from being too high.
6 LED power life
To improve the life of the LED drive power supply, it needs to be improved in many ways: use a longer life capacitor, improve power supply efficiency, do a good job of the power supply's heat dissipation function, and optimize the lighting design of the lamp. LED power supply is a switching power supply, the quality and reliability of the switching power supply depends on its circuit design, production process, and device quality. Electrolytic capacitor is an indispensable part of high-power switching power supply. The normal working life of the switching power supply depends on the life of the electrolytic capacitor used by the power supply. The life of the electrolytic capacitor depends on the life of the capacitor itself and the working temperature. The working life of the electrolytic capacitor varies greatly at different temperatures.
7 Working environment
Due to the different environment in each place, we must focus on the environment of the work place of LED lamps, such as temperature, humidity, installation location, etc.
Considering the working mode of the power supply, if no soft start circuit is added, the output will have a voltage spike at the moment of power-on. To better protect the LED, a soft start circuit needs to be added. This is a key factor in the stability of the drive power supply.
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