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The correct selection method and device configuration of LED lighting drive power supply
As the LED energy saving, long life, durable and flexible design, the current LED is rapidly replacing indoor and outdoor lighting in the incandescent and fluorescent lamps. But choosing the right LED is just part of the design equation. In order to achieve full efficiency, durability and longevity of your solid state lighting design, you need to choose the right power supply to match your application requirements and the LEDs used. This article will provide you with some useful advice on where to choose the power supply process to consider.
Related background introduction
Once the LED supply voltage is equal to or greater than the forward voltage drop of the diode (usually in the 2-3V region), the LED begins to produce light. The current required for full brightness varies from device to device, but is typically 350mA for 1W LEDs (usually the smallest size for lighting applications). Unlike incandescent lamps, LEDs are non-linear devices. This means that once the supply voltage exceeds the forward voltage of the diode, the current passed increases exponentially with the supply voltage. Without some form of current regulation, the LED chip will become an expensive, monostable flash bulb.
To prevent this, the power supply must supply the appropriate voltage at the appropriate current. The easiest way is to select a power supply whose output voltage is greater than the selected LED forward voltage and use a current limiting resistor to limit the current to the maximum specified by the LED manufacturer. The disadvantage of this approach is that one of the main advantages of LED lighting is the efficiency of the power dissipation of the current limiting device.
Another problem with this approach is that the LED junction temperature affects the forward voltage. Since the output voltage of the power supply is fixed, this in turn means that if the voltage across the current limiting device changes, the current will also change. The change in current will affect the amount of light emitted and reduce the reliability of the LED. The best way is to drive the LED with a constant current source. In this way, the current can be set to the maximum value specified by the LED manufacturer to achieve maximum efficiency and reliability, or to achieve the desired precision brightness, and can also eliminate the effect of junction temperature when the LED or ambient temperature changes.
In lighting applications, one of the benefits of using LEDs is easy to change the brightness. This can be achieved by changing the current through the LED, but running LEDs at less than their maximum current can degrade efficiency and may result in slight changes in color. Therefore, a better approach is to pulse the current between zero and maximum to change the average light emitted. As long as this is done at a sufficiently high frequency to avoid the pulse being seen by the human being as a flash, which is the best way to achieve dimming. The pulse of the current is usually carried out at a fixed frequency, and the ratio of zero to full current changes. This is a pulse width modulation (PWM) method.
Select the power supply
The type of power supply for lighting applications will be based on several factors. First, consider the application to run the environment. Is the application indoors or outdoors? Does the power supply need to be waterproof or require a special IP rating? Is the power supply capable of using conduction cooling or only convection cooling?
Next, define th
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Last Update : Jan 10, 2018
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