The LED driving power supply 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 driving power source includes high-voltage power frequency alternating current (ie, commercial power), low-voltage direct current, high-voltage direct current, low voltage high. Frequency communication (such as the output of an electronic transformer). The output of the LED driver is mostly a constant current source that changes the voltage as the LED's forward voltage drop changes.
Buying a drive power has two important points.
One: Look for the brand of capacitors, among which Ruby (Rubycom Japan) is particularly well-known, Hengying (HY domestic) is more common, of course, the price is a few cents more expensive than other unsuitable brand capacitors.
Two: Whether it has an IC control chip, because the IC control chip has protection functions such as short circuit, over voltage, overload, and over temperature.
As long as the drive power of these two points is in place, 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, must also consider the following points when selecting the LED driver power supply:
General principle
a, according to LED current and voltage characteristics, it is desirable to use constant current drive. It avoids the change of the forward voltage of the LED and causes the current to change, while the constant current stabilizes the brightness of the LED.
b. In addition, the luminous flux of LED is inversely proportional to the temperature, so the heat dissipation of the power supply and the well-designed heat dissipation system should be minimized during use. Thereby reducing the ambient temperature at which the LED operates.
c. In order to ensure the overall life of the LED product, it is necessary to control the junction temperature of the LED within a certain range, that is, to control the working environment temperature of the LED product.
1 high reliability
LED products mainly consist of LED chips and power supplies, heat-dissipating housings, and control circuits. Among them, the quality of LED power directly affects the quality of the product. In particular, LED street light products, because they are installed at high altitude, are inconvenient to maintain, and the maintenance cost is also large.
2 high efficiency
LED is an energy-saving product, and the driving power supply must also meet the requirements of energy saving. In particular, the structure in which the power supply is installed in the luminaire is particularly important. Because the luminous efficiency of the LED decreases as the temperature of the LED increases. The power supply has high efficiency, 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 LEDs.
3 constant current drive mode
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 anti-impact ability is relatively poor, so it is necessary to strengthen this aspect of protection. Especially for some products that are installed outdoors, the start and stop of the grid load and lightning strikes will have an impact on the power supply. Therefore, the input end of the LED driving power supply should have a protection circuit for suppressing the surge, so as to avoid the switch instantly damaging the LED.
5 temperature protection function
In addition to the conventional protection function, the power supply preferably increases 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 driver power supply, it needs to be improved from many aspects: use a higher life capacitor, improve the power efficiency, do a heat dissipation function of the power supply, and optimize the heat dissipation design of the lamp. The LED power supply belongs to the switching power supply. The quality and reliability of the switching power supply depend on its circuit design, production process, and quality of the device. Electrolytic capacitors are an integral part of high-power switching power supplies. 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 operating temperature. The working life of the electrolytic capacitor varies greatly at different temperatures.
7 working environment
Due to the different environments in each place, it is necessary to pay attention to the environment of the LED lighting workplace, such as temperature, humidity, installation location and so on.
Considering the way the power supply works, if the soft start circuit is not applied, the output will have a voltage spike at the moment of power-on. In order to better protect the LED, it is necessary to add a soft start circuit. This is a key factor in driving power supply stability.
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