High voltage transformer

Abstract

A high-voltage transformer is proposed. The objectives of the present invention, on one hand, is to prevent corona discharge formed between a primary winding and a secondary winding respectively wounded on a primary winding shaft .and a secondary winding shaft stacked together to sandwich a spacer in an insulating winding bobbin, on the other hand, is to achieve a low-profiled high-voltage transformer. In the present invention, the primary winding shaft (54) arranged in an upper section of the winding bobbin (50) is constructed in such a way that the diameter from a top end (54a) at a side further distant from the secondary winding shaft (56) to a predetermined middle location (54b) is the same, and the diameter from the middle location (54b) to a bottom end (54c) is gradually increased. Accordingly, insulation and voltage resistance between a high-voltage side of the secondary winding and the primary winding can be sufficiently ensured so as to prevent the formation of the corona discharge while achieving low profile for the winding bobbin (50).

Description

technical field [0001] The present invention relates to a high-voltage transformer mounted on circuit boards of various electronic devices. In particular, a high-voltage transformer having bobbins in which a cylindrical first winding shaft portion around which a primary winding is wound and a cylindrical second winding shaft portion around which a secondary winding is wound are stacked in a direction perpendicular to a circuit board. Background technique [0002] Conventionally, as such a high-voltage transformer, there is a conversion transformer used in a DC / AC conversion circuit, which enables multiple cold cathode discharge tubes (hereinafter referred to as cold cathode discharge tubes) CCFL) discharge and light up at the same time. [0003] In this conversion transformer, the AC voltage of about 12V applied to the primary winding is converted to a high voltage of about 1600-1800V in the secondary winding and then output. Therefore, there may be a gap between the primar...

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Problems solved by technology

[0005] However, in the technology disclosed in the above-mentioned Patent Document 1, the height (length in the axial direction) of the winding frame is significantly increased due to the provision of the above-mentioned dummy winding slot, which makes it difficult to reduce the height of the winding frame and the high-voltage transformer.

[0006] In addition, if the diameter of the outer peripheral surface of the first shaft-wrapping portion is larger than the diameter of the outer peripheral surface of the second shaft-wrapping portion on the entire surface in the axial direction, the winding area of ​​the primary winding will be enlarged by the corresponding diameter. The outer peripheral side of the first winding shaft is misaligned, so the winding diameter of the primary winding inevitably increases, resulting in an increase in the size of the bobbin

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