Iron-core and phase-reversing transformer using the iron-core

Abstract

The present invention provides a ferrite core and inverter transformer which can be made more efficient by a one-input and multiple-output structure and can be further reduced in the number of components and cost and has a high installation area reduction effect.The ferrite core comprises a leg portion 2 for a primary coil around which a primary coil 7 is to be wound, and leg portions 3, 4 and 5 for a secondary coil around which secondary coils 8, 9 and 10 are to be wound. These leg portions 3, 4 and 5 are magnetically coupled by a coupling portion 6. There are three or more leg portions 3, 4 and 5 for a secondary coil as opposed to just one leg portion 2 for a primary coil, and the leg portions 3, 4 and 5 for a secondary coil are formed at such positions that they may have nearly the same magnetic resistance with respect to the leg portion 2 for a primary coil. To be more specific, the distance between each of the leg portions 3, 4 and 5 for a secondary coil and the leg portion 2 for a primary coil is set nearly the same.

Description

technical field [0001] The present invention relates to a so-called multi-leg type iron core having a plurality of secondary coil legs with respect to one primary coil leg, and to an inverter transformer using such an iron core. Background technique [0002] For example, an inverter transformer that controls voltage changes in a lighting circuit that lights up the backlight of a liquid crystal display device usually combines a pair of iron cores of the same shape to form a closed magnetic path, and at the same time winds the iron cores together. It is composed of a primary coil and a secondary coil with different turns. The basic shape of the iron core is a U-shaped iron core with a pair of legs at both ends of the connecting part, and an E-shaped iron core that connects the central core and its side cores symmetrically arranged on both sides with the connecting part. represent. [0003] Figure 8 It is a schematic diagram of an example of an inverter transformer using a g...

AI Technical Summary

Problems solved by technology

[0010] However, in the inventions described in these patent documents, there are multiple outer legs wound around the secondary coil, but in the actual published literature, there are only examples where the number of outer legs is 2, and structures with more than 2 have never been used. recorded

Liquid crystal display devices are gradually developing toward larger screens, and the number of backlights tends to increase. In this case, limiting the number of outer legs to two will limit the reduction in the number of parts. Difficulty reducing actual size

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