Insider's Guide: Key Elements of LED Street Light Industry

The development of lighting projects in the LED industry is influenced not only by the global environment but also by specific industry factors. Among these, the LED street light power supply stands out as a paramount concern in current LED advancements. Various solutions and distinctive design techniques have emerged in relation to LED technology. Let's explore them individually.

1.Why is a constant current necessary for the LED street light power supply?

The properties of LED lighting materials make them significantly susceptible to environmental influences. For instance, variations in temperature cause an increase in LED current, and likewise, voltage fluctuations lead to a rise in LED current. Prolonged operation beyond the rated current significantly reduces the service life of the LED lamp beads. Constant current regulation in LEDs ensures a consistent operating current despite environmental shifts like temperature and voltage changes.

2. What is the accuracy of constant current in LED street light power supplies?

The accuracy of constant current in LED street light power supplies varies among products available in the market. Some widely used solutions exhibit a significant error margin of around ±8%, which exceeds the acceptable range for precise constant current regulation. Typically, the industry standard demands an accuracy within ±3%. To meet this criterion, production power supplies require meticulous calibration and fine-tuning to achieve an error margin of ±3% as per the designated design plan.

3.What is the operational voltage range of an LED street light power supply?

Typically, LEDs have a recommended working voltage of 3.0-3.5V. However, after testing, it's been found that a majority of them function optimally at 3.2V. Therefore, calculations based on 3.2V are considered more accurate. The total voltage for N lamp beads connected in series can be calculated as 3.2 * N.

4.What is the optimal operating current for an LED street light power supply?

Consider the rated operating current of LEDs, typically around 350 mA. While some factories utilize this maximum value from the start in their designs, operating at this current level often results in significant heat generation. After conducting numerous comparative tests, it has been found that designing it to operate at 320 mA is more ideal. This adjustment minimizes heat generation and enhances the conversion of electrical energy into visible light energy.

5.What are the considerations regarding series-parallel connections and the voltage range for LED street light power supply boards?

Ensuring the functionality of an LED street light power supply across a broad input voltage range (such as AC85-265V) relies significantly on the method of LED series and parallel connections within the light panel. It's crucial to minimize the usage of wide voltages, preferably focusing on divisions like AC220V and AC110V. This approach guarantees the reliability of the power supply.

Current power supplies commonly adopt a non-isolated step-down constant current structure. For instance, when targeting a voltage of 110V, the output voltage should not surpass 70V, and the number of series connections should stay under 23. With an input voltage of 220V, the output voltage can reach up to 156V, allowing for a maximum of 45 series connections. It's essential to limit the number of parallel connections to prevent excessive operating current and subsequent overheating of the power supply.

6.When considering isolation vs. non-isolation in LED street light power systems:

Typically, incorporating an isolated power supply of 15W into the LED street light tube poses challenges due to the considerable size of the transformer, making it difficult to accommodate. The feasibility largely hinges on space constraints and specific requirements. Isolated power supplies generally cap at 15W, with very few exceeding this threshold, often at a notably higher cost.

Consequently, the cost-effectiveness of isolation tends to be low. Non-isolation, therefore, emerges as the prevalent choice. Non-isolated setups allow for smaller sizes, with a minimum height as low as 8mm. With proper safety measures, non-isolated configurations pose no issues. If space permits, an isolated power supply remains a viable option.

7.How can the LED street light power supply be appropriately matched with the lamp bead board?

Some customers opt to design the light board before seeking a suitable power supply, only to encounter challenges in finding an appropriate match. This results in scenarios where either the current exceeds requirements with insufficient voltage (e.g., 7X1WI>350mA or V<20V) or the current falls short with excessively high voltage (e.g., I25V). These mismatches lead to issues like excessive heating, reduced efficiency, or a limited input voltage range.

Optimal performance can be achieved by employing the most suitable series-parallel connection method, ensuring uniform voltage and current application to each LED. The ideal approach involves early communication with power supply manufacturers to either customize a solution or produce a tailored power supply that aligns perfectly with the lamp bead board's specifications.

8. What are the series and parallel connection of LEDs and PFC power factor?

The operating current of electronic components within the rated voltage range influences heat generation and lifespan. Lower currents typically result in less heat and longer lifespans, while higher currents can shorten the lifespan. LED street light power beads are highly sensitive to AC content, with higher AC levels impacting light comfort negatively.

To reduce AC content and maintain voltage, electrolytic capacitors are commonly used. It's crucial that the capacitance at the low-voltage end isn't too small. For instance, the ratio of capacitance to output current should be 1UF<1.5MA to prevent LED flickering.

When choosing non-isolated input high-voltage electrolytic capacitors, the selection criteria are similar to isolated types, with a recommended output capacitor selection of 1UF<6MA. In dimming LED power supplies, the output-end electrolytic capacitor must meet the condition of 1UF<0.5MA.

9. What is the power efficiency of LED street light power supply?

The power efficiency of an LED street light power supply is a critical parameter calculated by subtracting the output power from the input power. This value signifies the efficiency of the conversion process; a higher value indicates lower efficiency, implying a significant portion of input power converts into heat and dissipates. If installed within a lamp, this generates high temperatures, which, combined with the heat emitted by the LED's efficiency ratio, escalates the overall temperature.

Rising temperatures shorten the lifespan of electronic components within our power supply. Therefore, efficiency stands as the fundamental determinant of the power supply's lifespan. It's essential for efficiency not to be excessively low, as it would result in excessive heat dissipation from the power supply. Typically, non-isolated types exhibit higher efficiency, often above 80%. However, efficiency also hinges on the matching connection method of the light panel.

10. How does the LED street light power supply dissipate heat?

The primary solution for heat dissipation in LED street light power supplies aims to significantly extend the lifespan of the power beads under high-temperature conditions. Typically, aluminum alloy is utilized due to its superior heat dissipation properties. This involves attaching the LED street light power beads to an aluminum substrate, maximizing the external heat dissipation area.

In summary, the complexities within the LED street light power supply domain require a comprehensive understanding of various factors, from constant current regulation to optimal connections and heat dissipation strategies. At LEDER Lighting, we prioritize customer satisfaction by offering tailored solutions and guiding our customers through potential pitfalls. Our commitment to quality, efficient LED solutions, and dedicated customer support make LEDER Lighting a prudent choice for anyone seeking reliable and innovative LED lighting solutions. We aim to serve each customer with sincerity and expertise, ensuring an illuminating experience every step of the way.