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Eight key points when choosing LED driver

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LED is a characteristic-sensitive semiconductor device, and it has negative temperature characteristics, so it needs to be in a stable working state and protected during the application process, resulting in the concept of driving. Led devices have almost strict requirements on the driver power supply, LEDs are not like ordinary incandescent light bulbs, can be directly connected to 220Vac mains. Led is a low-voltage driver of 2-3V, and a complex conversion circuit must be designed. LED lights for different purposes must be equipped with different driver power supplies. Customers have very high requirements for efficiency conversion, effective power, constant current accuracy, power supple life, and electromagnetic compatibility of the LED driver power supply. To design a good power supply, these factors must be comprehensively considered, because the role of the power supply in the whole lamp is as important as the human heart. The following will explain the eight points that need to be paid attention to when choosing an LED driver power supply.
LEDs have always been driven by DC, so an LED drive power supply needs to be added between the mains and the LEDs. Its function is to convert AC mains into DC power suitable for LEDs. According to the power consumption rules of the power grid and the driving characteristics of LEDs, the following eight points need to be considered when selecting and designing the LED driving power supply:
1. High reliability
LED products are mainly composed of LED chips, power supply, heat dissipation shell, control circuits, and so on. Among them, the quality of the LED power supply directly affects the quality of the product. Especially for LED street lights, because they are installed at high altitudes, maintenance is inconvenient and expensive, so the reliability of a power supply is very important. For example, this 150W waterproof drive power supply uses an aluminum casing, which can effectively dissipate heat. The waterproof level is IP67, which is suitable for outdoor lighting fixtures.

2. High efficiency
LED is an energy-saving product, and the driving power must also meet the requirements of energy-saving. Because the luminous efficiency of LED decreases with the increase of LED temperature, the efficiency of the power supply is high, its power loss is small, and the heat generated in the lamp is small, which reduces the temperature rise of the lamp, which is beneficial to delay the light decay of the LED, for example, this 20W light tube drive power supply has an efficiency of up to 95% and stable performance. It is suitable for T8/T10 light tubes.

3. High PF
The level of power factor is very different when the same product is used in a large area, which is also the key point to consider for energy-saving products, this 20W isolated drive power supply, pf up to 0.95, complies with safety regulations, stable performance, suitable for various lamps and lanterns.
4. Driver mode
There are two ways to drive LEDs: One is constant current, and the current output by the constant current drive circuit is constant, however, the output DC voltage varies within a certain range with the load resistance value. When the load resistance value is small, the output voltage is low. When the load resistance value is large, the output voltage is high. The constant current drive is ideal for LEDs but relatively expensive. The second is the constant voltage. When the parameters in the voltage stabilizer circuit are determined, the output voltage is fixed, but the output current changes with the increase or decrease of the load. The voltage stabilizer circuit is not afraid of the loading opening, but the load is strictly prohibited complete short circuit.
5. Surge protection
The anti-surge ability of LED is relatively poor, especially the anti-reverse voltage ability, so it is also very important to strengthen the protection in this regard. For example outdoor street lights, due to the startup of the grid load and the induction of lightning strikes, the LED drive power supply must have the ability to suppress the intrusion of surges and protect the LEDs from being damaged.
6. Protection function
In addition to the conventional overload, overcurrent, overvoltage, open circuit, and short circuit protection functions of the power supply, it is best to add LED temperature negative feedback to the output to prevent LED temperature from being too high.
7. Work environment
Due to the different environments in various places, it is necessary to focus on the temperature and humidity of the place where the LED lamps are located. Considering the working mode of the power supply, if the soft-start circuit is not added, there will be a voltage spike at the output at the moment of power-on. To better protect the LED, a soft-start circuit needs to be added
8. Power life
The life of the power supply should match the life of the LED. For example, the long-life electrolytic capacitor used in this 60W constant current drive power supply has stable performance and a lifespan of 3-5 years.

The above are the eight points to consider when choosing an LED driver power supply. Usually, the reliability and efficiency of the LED drive are mutually restrictive. High-efficiency power supplies will inevitably reduce reliability. To improve reliability, power efficiency must be sacrificed. Therefore, we should pay attention to this point when selecting LED drive power supplies. If you want to know more, please feel free to contact us!

Eight key points when choosing LED driver

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