Due to the energy-saving, 5 years warranty led street light, durability and design flexibility of LEDs, LEDs are currently rapidly replacing incandescent and fluorescent lamps in indoor and outdoor lighting equipment. But choosing the right LED is only part of the design equation. In order for your solid-state lighting design to achieve full efficiency, durability and service life, you need to choose the right power supply to match your application requirements with the LEDs used.

This article will provide you with some useful suggestions, which need to be considered in the process of choosing a power supply. Related background introduction Once the power supply voltage of the LED is equal to or greater than the forward voltage drop of the diode (usually in the region of 2-3V), the LED starts to produce light. The current required for full brightness varies from device to device, but for a 1W LED (usually the smallest size in lighting applications) it is usually 350mA.

Unlike incandescent lamps, LEDs are non-linear devices. This means that once the power supply voltage exceeds the forward voltage of the diode, the passing current increases exponentially with the power supply voltage. Without some form of current regulation, LED chips will become expensive, monostable flash bulbs. To prevent this, the power supply must provide the right voltage at the right current. The simplest method is to select a power supply with an output voltage greater than the forward voltage of the selected LED,

and use a current-limiting resistor to limit the current to the maximum value specified by the LED manufacturer. The disadvantage of this method is that one of the main advantages of LED lighting, high efficiency, is affected by the power dissipated by the current limiting device. Another problem with this method 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.

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