The high reliability of LED drive power is an important condition for the quality of LED products, and it is also a technical problem to be solved urgently. In order to better solve the high reliability of LED drive power, LED related engineers must know from the source why the reliability of LED drivers is so low? This article lists the reasons for the low reliability of LED drivers in detail for everyone, hoping to add icing to the design of power engineers. Although LED has high luminous efficiency, only a small part of the energy flowing through the LED can be radiated in the form of visible light, and most of the remaining energy is consumed in the LED in the form of heat, so the LED light source itself generates more heat. The main reasons for the low reliability of LED drivers in the industry are as follows: First, long-term full-load work. Without dimming, the LED driver is working near full load. In most applications of switching power supplies, such as computer power supplies (adapters), communication power supplies, and household appliances, the average power for long-term work is usually only rated power. In a fraction of the time, the full power state where all loads are turned on will only occur for a specific few times. Second, close to the heat source. Although LED has high luminous efficiency, only a small part of the energy flowing through the LED can be radiated in the form of visible light, and most of the remaining energy is consumed in the LED in the form of heat, so the LED light source itself generates more heat. The LED driver is usually placed inside the lamp, close to the LED light source. At a normal ambient temperature of only 20-30 ° C, the ambient temperature around the driver can easily reach 50-60 ° C. At such a high ambient temperature, the driver's Reliability is very challenging to the design (especially the efficiency index). Third, outdoor lighting occasions such as roads and squares are easily damaged by natural phenomena such as external lightning strikes. These will cause a series of shortcomings such as post-maintenance to the large-scale application of LED semiconductor lighting. The high reliability of LED drive power is an important condition for the quality of LED products, and it is also a technical problem to be solved urgently.
Applications:
The Grounding Transformer is a
kind of auxiliary transformer that used to offer an earth point for the
Delta-Star system. They are typically used for providing a path to ground for
unbalanced load current and for fault currents on system where a suitable
ground is otherwise not available.
Design:
The grounding
transformers are generally designed with one of the two configurations: Zig-Zag (Zn) with or without
an auxiliary winding or a Wye (Ynd) with a delta connected secondary. The
Zig-Zag connection is preferred as it is more cost effective and have smaller
size than the Delta-Wye unit. For more safety, neutral earthing resistors (NER)
are often used in conjunction with the grounding transformer to limit neutral
ground fault current magnitude. The rated voltage of the NER should be equal to
the line to ground voltage of the grounding transformer. The current rating and
duration should match the grounding transformer
Why SCOTECH
Long
history- Focus on transformer manufacturing since 1934.
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support – 134 engineers stand by for you 24/7.
Manufacturing-advanced
production and testing equipment, strict QA system.
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service-The complete customer service package (from quotation to energization)
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