LTCC low temperature co-fired ceramic flat surface transformer

A low-temperature co-fired ceramics, planar transformer technology, applied in transformers, fixed transformers, transformer/inductor cores, etc., can solve the problem of small planar transformers, and achieve good current distribution density consistency, high winding accuracy, The effect of good thermal conductivity

CN101789311AInactive Publication Date: 2010-07-28SHENZHEN SUNLORD ELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-07-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an LTCC low temperature co-fired ceramic planar transformer. The transformer comprises a ferrite magnetic core composed of an upper magnetic core and a lower magnetic core. The transformer is characterized in that the transformer also comprises an LTCC planar transformer base plate provided with at least one group of planar coil component, each planar coil component comprises a primary coil with high coupling coefficient and a secondary coil; the LTCC planar transformer base plate is provided with one or three penetrating holes used for assembling the ferrite magnetic core; and the upper and lower magnetic cores separately penetrate the penetrating holes from the upper and lower sides of the LTCC planar transformer base plate and are butted and adhered together to form the ferrite magnetic core. Compared with the traditional planar transformer, the LTCC low temperature co-fired ceramic planar transformer of the invention has the following beneficial effects: the transformer of the invention has low direct current impedance, leakage inductance and distributed capacitance and can satisfy the design requirement of the resonance circuit; and as the magnetic core has good magnetic shielding, the transformer can inhibit the radio frequency interference.
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Description

technical field

[0001] The invention relates to a planar transformer, in particular to an LTCC low-temperature co-fired ceramic planar transformer. Background technique

[0002] Traditional planar transformers are mostly manufactured by winding coil technology, and the wound planar transformers manufactured by this traditional method are relatively large in size. The planar transformer made by replacing the traditional wire-wound coil with the PCB board coil is smaller than the traditional wire-wound transformer. However, it is impossible to make the planar transformer smaller to meet the requirements of miniaturization, high frequency and light weight of the power module. Contents of the invention

[0003] A technical problem to be solved by the present invention is to make up for the defects of the above-mentioned prior art, and provide a LTCC low-temperature co-fired ceramic planar transformer that can meet the requirements of miniaturization, high frequency, and light...

Examples

Embodiment Construction

[0034] From figure 1 It can be clearly seen that the LTCC low-temperature co-fired ceramic planar transformer includes: a ferrite core composed of two low-profile E upper cores 1 and E lower cores 2, and a LTCC planar transformer with a set of planar coil components inside. substrate3.

[0035] The planar coil assembly is composed of a primary coil L1 and a secondary coil L2 with a high coupling coefficient.

[0036] The LTCC planar transformer substrate 3 as figure 2 As shown, there are metal strips printed on the six-layer screen between the high-frequency ceramic diaphragm 31 of the surface layer, the high-frequency ceramic diaphragm 38 of the bottom layer, and the six layers stacked between the high-frequency ceramic diaphragm 31 of the surface layer and the high-frequency ceramic diaphragm 38 of the bottom layer. The high-frequency ceramic diaphragm with the shape of a conductive coil pattern is fired. The high-frequency ceramic diaphragm with metal strip-shaped condu...