Shielding structure, circuit and power adapter

A power adapter and shielding structure technology, which is applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of overall loop impedance reduction, which is not conducive to suppressing common mode noise of the circuit, etc.

Active Publication Date: 2021-06-25
NANJING MACROTEST SEMICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In extreme cases, when the circuit operates at high frequency, the distribution of the above-mentioned parasitic capacitance will basically make the common-mode inductance invalid, so that the impedance of the overall circuit after parallel connection is reduced, which is not conducive to suppressing the common-mode noise in the circuit

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  • Shielding structure, circuit and power adapter
  • Shielding structure, circuit and power adapter
  • Shielding structure, circuit and power adapter

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Embodiment Construction

[0030] In order to make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries shoul...

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Abstract

A variety of shielding structures, circuits and power adapters. In the present invention, two shielding layers are arranged between the rectifying filter capacitor and other components in the circuit, and one of the shielding layers is connected to the secondary ground SGND of the circuit, and the other shielding layer is connected to the secondary ground SGND of the circuit. The present invention can utilize the circuit connection relationship of the shielding structure, so that the equivalent parasitic capacitance between the rectification filter capacitor and the shielding layer is no longer connected in parallel with the common mode inductance in the circuit. Therefore, when the present invention works in a high-frequency state, the impedance characteristic of the common-mode inductor is less affected by the parasitic capacitance, and the common-mode inductor will not lose its effect on high-frequency noise due to the influence of the parasitic capacitance. The shielding structure of the present invention is suitable for DC filters, AC filters, AC-DC mixed-mode filters and power adapter circuits, and can effectively ensure the suppression of high-frequency common-mode noise in the circuits.

Description

technical field [0001] The invention relates to electromagnetic interference shielding technology, in particular to a shielding structure, circuit and power adapter. Background technique [0002] In the circuit structure of the power adapter, due to the near-field coupling between the devices, parasitic capacitance distribution will be generated between the devices. Each parasitic capacitance is equivalently connected in parallel at both ends of the common mode inductance of the power adapter. [0003] The common-mode inductor in the power adapter is designed to suppress common-mode noise. Theoretically, the greater the impedance of the common-mode inductor itself, the higher the degree of suppression of the common-mode noise in the adapter circuit, and the interference caused by the common-mode noise can be reduced as much as possible. However, due to the distribution of parasitic capacitance, in the equivalent circuit of the power adapter, the common-mode inductance actu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/44
CPCH02M1/44
Inventor 包智杰
Owner NANJING MACROTEST SEMICON TECH CO LTD
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