The design of LED power supplies requires consideration of many factors. Efficiency and quality are important, but cost control is a must. How to find a balance between these three can design a better power solution, this article describes a small cost power solution designed by an engineer, for your reference only.
Program features:
Isolation scheme: can pass CE
Input: AC85~265V
Output: 9.05V current 0.7A
PF value: at 220V, 0.938 (can also be adjusted a little larger)
THD: about 15%
Power efficiency: 82%
Size: PCB40*25*16
The entire power material cost is about RMB 8
Using a 3x3WRM6 transformer, the schematic of the transformer is as follows:
Figure 1: Schematic diagram of the transformer
The schematic diagram of the scheme is as follows:
Figure 2: Block diagram of the scheme
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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Grounding Transformer
Grounding Transformer,Neutral Grounding Transformer,Neutral Earthing Transformer,Neutral Grounding Transformer For Generator
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