How To Choose Suitable Drive Power Supply For LED Street Lamps?

With the rapid development of LED street lighting industry, as an indispensable part of the LED street lighting industry chain, LED drive power supply is gradually becoming stable and reliable.The large-scale application of LED lighting began indoors and gradually transitioned to the field of public lighting and outdoor road lighting.

LED driving power supply is not only an indispensable part of LED lighting products, but also the main factor affecting the stability of LED lighting lamps.The rapid growth of the global LED lighting market promotes the continuous development of drive power supply for LED lighting industry.Nowadays,the power supply for LED street lamp sold on the market has a wide variety and the functions are also increasingly powerful.Power supply performance is becoming more and more important for the working performance of LED street lamp.

About drive power supply for led street lamps

Drive power supply for led street lamps drives the LED to light with a voltage or current.The input part of LED drive power supply generally includes several parts: power frequency mains, low voltage DC, high voltage DC, low voltage high frequency AC, etc.The output is mostly a constant current source that can change voltage as the LED forward voltage drop changes.The core components of LED drive power supply include input filter, switch controller, inductor, MOS switch tube, feedback resistance, output filter and so on.In addition, some drive power supply include input overvoltage/undervoltage protection open circuit protection, overcurrent protection, etc.

The characters of power supply for LED drive

1. High reliability

The drive power supply especially for LED street lamp, installed in the air, maintenance is not convenient, maintenance costs are also large.

2. High efficiency

LED street lamp is an energy-saving product, it required that the efficiency of driving power supply should be high.For the LED lamps that the power supply installed inside,high heat dissipation performance is required.If the efficiency of the power supply is high, so its power consumption is small, and the heat inside the lamp is small.The small temperature rise inside lamps is conducive to delaying LED light decay.

3. High power factors

The power factor is the load requirement of power grid.In general, for household appliances below 70W,there is no rigid indicators.Although the power factor of a single household appliance with low power has little influence on the power grid, the amount of lighting at night is large and the similar load is too concentrated, which will produce serious pollution to the power grid.For the led drive power supply with 30w to 40w, there may be a certain indicator of power factors in the future.

4. Drive way

Currently, there are generally two driving ways:One is ac power supply, each constant current source independently for each LED power supply.In this way, the combination is flexible, one line of LED failure does not affect the work of other LED, but the cost will be slightly higher.Another way is dc power supply. LED series or parallel operation.It has the advantage of lower cost but less flexibility.

5. In terms of protection

For the lamps such as led road light installed outdoors or in a complex environment, the structure of power supply needs to be waterproof, moisture-proof and has high-temperature resistant.

Classification of LED drive power supply

According to the driving mode,LED drive power supply is divided into constant flow and constant pressure type.Constant current circuit is characterized by constant output current, output voltage changes with the load resistance.Constant current power supply for LED driving is a more ideal scheme and is not afraid of load short circuit, LED brightness consistency is better.Its disadvantages are:high cost, forbid full open load, the number of LED should not be too much, because the power supply has the maximum current and voltage limits.

Constant voltage drive circuit is characterized by constant output voltage, output current changes with the load resistance, voltage is not very high.Its disadvantage is that complete short-circuit of load is prohibited and voltage fluctuation will affect LED brightness.

Selection key points for power supply of LED street lamps

Firstly, the power supply for LED street lamp with appropriate control mode is selected according to the load characteristics.

Secondly,choosing the protective structure of power supply for LED street lamp according to the installation environment.The protective structure of power supply for LED street lights should be adapted to its installation environment, which should consider environmental temperature, humidity, dust, ph, corrosive gas and other factors, which is of great importance to the long-term, safe and reliable operation of power supply for outdoor led street light.