Ceramic packaged power supply filter

Abstract

The invention discloses a ceramic packaged power supply filter, which comprises a base and a metal sealing frame, wherein the metal sealing frame and the base are co-fired into a whole at high temperature; the base is a high-thermal-conductivity ceramic base, and the high-thermal-conductivity ceramic base is of a multi-layer circuit board structure formed by alternately arranging ceramic layers and metal layers up and down; and the top layer of the high-thermal-conductivity ceramic base is used for installing a filtering component, the middle layer is used for a power supply layer or a shielding layer, the bottom layer is provided with bottom layer bonding pads used for leading-out ends of the filter, and each bottom layer bonding pad is electrically connected with the middle layer and the top layer through metalized via holes. The structure is simple, high-density interconnection is achieved through high-temperature co-firing of the high-thermal-conductivity ceramic base and the metal sealing frame and integration of a ceramic material and a metal material, good heat dissipation and shielding performance is achieved, the bottom layer bonding pad is arranged on the bottom layer of the base, the ceramic packaged power supply filter is suitable for the reflow soldering technology, and the electric fitting efficiency is far higher than that of manual welding.

Description

technical field [0001] The invention relates to the technical field of power filters, in particular to a ceramic-packaged power filter. Background technique [0002] At present, most of the power filters in the industry are metal shells, and the circuit boards use resin substrates or ceramic substrates. There are also a small part based on the requirements of small size and low weight, which use plastic shells, and circuit boards also use resin substrates. [0003] Due to its certain shielding effect, metal shells are widely used in power filters. However, the combination of metal shells and circuit boards needs to be completed by welding, bonding, etc., which not only increases the complexity of the process, but also has gaps. It cannot achieve a completely sealed and shielded state; the plastic shell can meet the requirements of small size and low weight, but this type of material has a large dielectric constant, and when it is applied to a power filter, it will produce a ...

AI Technical Summary

Problems solved by technology

[0003] Metal shells are widely used in power filters due to their shielding effect. However, the combination of metal shells and circuit boards needs to be completed by welding, bonding, etc., which not only increases the complexity of the process, but also has gaps. It cannot achieve a completely sealed and shielded state; the plastic shell can meet the requirements of small size and low weight, but this type of material has a large dielectric constant, and when it is applied to a power filter, it will produce a large Parasitic parameters, especially parasitic capacitance, which couple high-frequency noise and affect the performance of the filter. On the other hand, the plastic shell has poor heat resistance and is not suitable for applications such as high current and high power.

[0004] At present, ordinary power filters mostly adopt the pin structure, that is, through welding or insulators, the pins are drawn out from the base as the lead-out end of the filter. This type of lead-out filter is only suitable for manual welding, and the efficiency is low.

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