Inverter transformer

Abstract

A magnetic body iron core (4) is composed of two I-shaped iron cores (41, 42) and an E-shaped iron core (43), which comprises: a first iron core part (44), penetrating a primary coil (1); a second iron core part (45), penetrating a first secondary coil (2); a third iron core part (46), penetrating a second secondary coil (3); and an end side connecting iron core part (47), connected to the end part of one end side of the first to the third iron core parts (44-46). The two I-shaped iron cores (41, 42) are configurated in a way that one end part (41a, 42a) clamps an axis (C1) and is opposite over a preset interval, and contracts with one end part of the first iron core part (44), to separate two magnetic circuits (M1, M2). Accordingly, two straight tubes are driven through in-phase lighting, and an inverter transformer in two-to-one horizontal shape having a miniature structure smaller than the setting area of a substrate is provided.

Description

technical field [0001] The present invention relates to a DC / AC (direct current / alternating current) inverter circuit for discharging / lighting cold cathode discharge tubes (CCFL) used in various display panels such as notebook computers and liquid crystal televisions, etc. The inverter transformer used. Background technique [0002] Conventionally, there is known an inverter transformer (hereinafter referred to as "two-in-onerow type"), in which two secondary coils are electromagnetically coupled to one primary coil, and each coil is The first secondary coil, the primary coil, and the second secondary coil are sequentially arranged so that the axes are aligned in parallel to each other. (Note: The core of the transformer is generally called the iron core, which is called the iron core in this article) [0003] For example, in Japanese Patent Laid-Open No. 2005-39050, an inverter transformer has been described, in which a primary coil is wound around the middle legs of two ...

AI Technical Summary

Problems solved by technology

[0005] However, when the core members forming the respective magnetic circuits are partially shared as described above, there arises a problem that it is difficult to separate the two magnetic circuits from each other, resulting in the electromagnetic coupling of the two secondary coils to each other.

Therefore, in the past, this type of inverter transformer was specially used to reverse the phases of the voltage outputs from the two secondary coils to drive a U-shaped tube or a similar U-shaped tube, and it was difficult to use it to light the lamp in the same phase. drive two straight pipes

[0006] In order to light and drive two straight tubes in the same phase, it is necessary to separately configure iron core members for forming each magnetic circuit to completely separate the two magnetic circuits, or to use a current balance transformer described in Japanese Patent Application Laid-Open No. 2006-287177. However, No matter which of the above-mentioned methods is adopted, there will be problems such as increasing the number of constituent parts, resulting in an increase in size, and increasing the installation area for the substrate.

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