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Circuit for eliminating noise of switching power supply

A technology for eliminating noise and switching power supply, which is applied in the field of power supply, can solve the problems of high cost and large volume, and achieve the effect of low cost, good EMC performance and cost reduction

Inactive Publication Date: 2011-05-04
SHENZHEN HUNTKEY ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the 3Pin input structure has a better suppression effect than the structure of the 2Pin AC input switching power supply without the Y capacitor, but it requires a higher cost and a larger volume

Method used

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  • Circuit for eliminating noise of switching power supply
  • Circuit for eliminating noise of switching power supply
  • Circuit for eliminating noise of switching power supply

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Embodiment Construction

[0023] It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0024] figure 1 A structural schematic diagram of an embodiment of a noise elimination circuit for a switching power supply is proposed.

[0025] The noise elimination circuit of the switching power supply in this embodiment includes a transformer T and at least one set of symmetrical Y capacitors. The primary winding T1 of the transformer T is connected to the AC input terminal 10 , and the secondary winding T2 is connected to the DC output terminal 20 . A set of symmetrical Y capacitors includes a first Y capacitor C Y1 and the second Y capacitor C Y2 . where the first Y capacitor C Y1 Respectively connect the positive input terminal of the AC input terminal 10 and the negative output terminal of the DC output terminal 20, the second Y capacitor C Y2 Connect the negative input terminal of the AC output t...

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Abstract

The invention relates to a circuit for eliminating noise of a switching power supply. The circuit comprises a transformer, a primary winding of the transformer is connected with an alternating current input end, a secondary winding is connected with a direct current output end, and the circuit further comprises at least one group of symmetrical Y capacitors, wherein a first Y capacitor in the group of the symmetrical Y capacitors is respectively connected with the positive input end of the alternating current input end and the negative output end of the direct current output end, and a second Y capacitor is respectively connected with the negative input end of the alternating current input end and the negative output end of the direct current output end. By arranging the symmetrical Y capacitors, not only can the purpose of eliminating the noise be achieved, but also the characteristics of high efficiency and good EMC (electromagnetic compatibility) performance can be realized in comparison with the prior art. In addition, the circuit for eliminating the noise has the advantages that the volume of the switching power supply can reduced and the cost and process are reduced in comparison with a 3Pin input structure in the prior art; and furthermore, the circuit has universal practicability in strong plug-in connection type power supplies.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a noise elimination circuit for a switching power supply. Background technique [0002] Currently, power supply devices that can convert AC to DC include switching power supplies and linear power supplies. Switching power supply is widely used due to its remarkable characteristics of small size, light weight and high efficiency, but it will generate certain noise during operation, which will affect the normal operation of electronic equipment. [0003] In the existing 2Pin AC input switching power supply, the Y capacitor in the switching power supply is deleted to reduce the coupling of AC frequency noise between the primary and secondary stages of the switching power supply, thereby achieving the purpose of reducing noise. However, the noise suppression effect of the switching power supply with the Y capacitor removed is still not good. Therefore, some people use the 3P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44
CPCH02M1/126H02M1/44
Inventor 李晓刚唐镇平江国权唐旦
Owner SHENZHEN HUNTKEY ELECTRIC
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