With the continuous decline of LED costs and the increasing emphasis on energy conservation and environmental protection by governments, the market prospects for LED lamps are becoming more and more broad. High-brightness LED lights have appeared in a variety of applications, from outdoor billboards, TV LED backlights to traffic lights, airport runway navigation lights, and more. The advantages of LED lights are also particularly prominent, such as long life, high energy efficiency and rich colors.
However, LED lamp designers must first consider the reliability of the lamp. For many occasions, the importance of reliability is self-evident: for example, some outdoor lighting with high maintenance costs, and some applications that are prone to safety hazards, including traffic lights and navigation lights. LEDs are also a fragile semiconductor solid state device. Its illumination principle is that the diode's PN junction forward voltage bias produces a light source. Both LED arrays and power supplies are at risk of being damaged by transient voltages, surge currents, and other electronic problems. Especially in outdoor lighting applications, electrostatic discharge (ESD) due to an adjacent lightning strike can easily cause LED failure. As the world's leading manufacturer and solution provider of protective devices, Littelfuse has a wide selection of products that provide high performance LED protection solutions for these threat sources.
Power supply protection scheme
In the switching power supply section, the overcurrent and overvoltage protection schemes recommended by LF are as follows:
TVS tube
The AK6 and AK10 series are transient voltage suppressors (TVS) with extremely high current ratings designed to protect AC and DC input circuits from transient voltage damage. They are rated at 6kA (8x20us) and 10kA (8x20us). The 15KPA and 30KPA are TVS rated at 15,000 W and 30,000 W, respectively, which are ideal for protecting LED lighting in harsh environments. The 1.5SMC series is a 1500W rated TVS that is ideal for protecting DC-DC converters from transient voltage damage.
TMOV Thermal Protection Varistor
TMOV integrates thermal components to help the TVSS module utilize the appropriate housing and meet UL1449 standards for cable connections and permanent connection applications. TMOV offers faster thermal response and lower inductance than most discrete solutions, resulting in improved clamping performance for fast response to voltage transients.
With the continuous decline of LED costs and the increasing emphasis on energy conservation and environmental protection by governments, the market prospects for LED lamps are becoming more and more broad. High-brightness LED lights have appeared in a variety of applications, from outdoor billboards, TV LED backlights to traffic lights, airport runway navigation lights, and more. The advantages of LED lights are also particularly prominent, such as long life, high energy efficiency and rich colors.
However, LED lamp designers must first consider the reliability of the lamp. For many occasions, the importance of reliability is self-evident: for example, some outdoor lighting with high maintenance costs, and some applications that are prone to safety hazards, including traffic lights and navigation lights. LEDs are also a fragile semiconductor solid state device. Its illumination principle is that the diode's PN junction forward voltage bias produces a light source. Both LED arrays and power supplies are at risk of being damaged by transient voltages, surge currents, and other electronic problems. Especially in outdoor lighting applications, electrostatic discharge (ESD) due to an adjacent lightning strike can easily cause LED failure. As the world's leading manufacturer and solution provider of protective devices, Littelfuse has a wide selection of products that provide high performance LED protection solutions for these threat sources.
Power supply protection scheme
In the switching power supply section, the overcurrent and overvoltage protection schemes recommended by LF are as follows:
TVS tube
The AK6 and AK10 series are transient voltage suppressors (TVS) with extremely high current ratings designed to protect AC and DC input circuits from transient voltage damage. They are rated at 6kA (8x20us) and 10kA (8x20us). The 15KPA and 30KPA are TVS rated at 15,000 W and 30,000 W, respectively, which are ideal for protecting LED lighting in harsh environments. The 1.5SMC series is a 1500W rated TVS that is ideal for protecting DC-DC converters from transient voltage damage.
TMOV Thermal Protection Varistor
TMOV integrates thermal components to help the TVSS module utilize the appropriate housing and meet UL1449 standards for cable connections and permanent connection applications. TMOV offers faster thermal response and lower inductance than most discrete solutions, resulting in improved clamping performance for fast response to voltage transients.
Fuse fuse
The AC line fuses are based on the 464 series, which provides a minimized, fast-responding surface mount 250VAC fuse that meets the IEC60127-4 standard and is specifically designed for power and lighting system design applications.
High-voltage DC fuses are available in the 477 or 505 series, both designed for high-energy and power applications. The 477 series is available in 400VDC/500VDC rated voltage, time-delay, surge-resistant fuses in a 5x20mm package; the 505 series offers 500VAC/ The VDC rated voltage fuse has an open current rating of up to 50kA and is available in a 6.3 x 32mm package.
LED array partial protection scheme: PLED open circuit protector
The above solution can effectively cope with the surge threat generated by the power supply part and protect the LED from damage. However, we all know that LED lamps and the like are usually formed by a series of LED tubes connected in series or in parallel, and the destruction of a single LED will cause the entire LED array to stop working. Traditional fuses, MOVs, and TVS do not guarantee such problems. Therefore, at the LED array end, LF specially developed a PLED LED open circuit protector for LED open circuit, as shown in the figure:
PLED LED open circuit protector
The PLED series is a voltage-triggering switch conducting component that is used in the circuit as a bypass and LED light in use. When the LED is open, the voltage drops all onto the PLED. Thus, the PLED is activated to turn on, this shunt path bypasses the open LED and allows current to flow into other LEDs in the series circuit, thereby eliminating the effects of damage caused by an LED and improving the LED lighting design. stability. PLED can protect up to 4 high-brightness LEDs at the same time, providing strong protection at a lower cost. It is mainly suitable for high-brightness LED lights such as 1W, 2W, 3W, and the maximum flow rate is 1000mA.
Compared to traditional LED protection solutions, Littelfuse's PLED devices offer a simpler and more economical circuit design with features and benefits including:
1. When the LED is damaged, the whole LED string will continue to work.
2, can use DO-214AA, chip-level QFN and Powermite package
3, can protect up to 4 high-brightness LED tubes, providing strong protection at a lower cost
4, 2-in-1 protection (open circuit fault protection, and additional surge and ESD protection)
5, the protection action will not have any negative impact on the power supply
6, reverse connection protection
7, can be compatible with 10KHz PWN dimming speed
8, automatically reset after the LED open circuit recovery
Conclusion
Littelfuse's high reliability, low maintenance outdoor LED lighting overall protection solution greatly reduces the maintenance cost of LED lights, prolongs the service life and enhances the brand value of the products. As the largest distributor of Littelfuse in China, Asiacom is committed to providing customers with the most thoughtful technical support and supply services, creating more value for Chinese LED lighting manufacturers.
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