A plastic-encapsulated transformer and its manufacturing process and special lead frame

Abstract

The invention discloses a plastic-encapsulated transformer and its manufacturing method and special lead frame, which also includes first and second brackets and primary coil brackets, the first and second brackets are located on the periphery of the ring magnetic core, The terminal as the lead pin of the secondary coil is located in the shell, and the outer end extends out of the shell as the functional pin of the secondary coil, and the winding leads of the secondary coil are respectively wound on the inner ends of the first and second brackets to achieve electrical communication through welding; The middle part of the primary coil support has a vertical rod section and the vertical rod section passes through the central hole of the annular magnetic core to form a primary coil, and the two outer ends of the primary coil support extend out of the shell as the functional feet of the primary coil; the shell will have a secondary The annular magnetic core of the primary coil, the middle part of the primary coil bracket and the inner ends of the first and second brackets are integrally molded inside by plastic sealing. The invention can improve production efficiency, ensure consistency of product performance and appearance, reduce product volume, improve pressure resistance performance, and realize automatic mechanized production.

Description

technical field [0001] The invention relates to a transformer, in particular to a plastic-encapsulated transformer, a manufacturing process of the plastic-encapsulated transformer, and a special lead frame used in the manufacturing process. Background technique [0002] In recent years, with the rapid development of switching power supply technology, its application fields have become more and more extensive, especially the modular power supply used in industrial automatic control and intelligent instrumentation. This kind of modular power supply is generally used in high temperature, high humidity and limited In the industrial application environment of the installation space, the harsh application environment puts forward higher requirements on the comprehensive indicators such as the size, performance and power level of the module power supply. In order to achieve the reliability of small size, high withstand voltage, high precision and high efficiency The sampling of the...

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Problems solved by technology

[0004] Both of the above two production methods have the following disadvantages: (1) Manual assembly is required. Due to different understandings of the operating technology by different people, the assembly operation methods will be different, resulting in differences in the finished products after assembly, which will ultimately affect the quality of the product. Consistency; (2) Due to the different proficiency of different people, the efficiency of production will also be different, so in mass production, the proficiency of manual operation is highly dependent, which is not conducive to improving production efficiency and reducing production costs; (3) When the transformer volume When it is small, it is difficult to meet the insulation requirements between the primary and secondary windings, especially in the process of winding, if the wire sheath in the primary and secondary windings is damaged, it is easy to have poor withstand voltage between the primary and secondary windings , and even a direct short circuit between the primary and secondary windings

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