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Low noise planar transformer

一种变压器、共模噪声的技术，应用在低噪音平面型变压器及其制造领域，能够解决没有披露、降低共模噪声等问题，达到降低共模噪声、降低噪声耦合、提高EMI性能的效果

Active Publication Date: 2006-05-10
ASTEC INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] US Patent US 6,211,767 discloses a transformer with secondary copper straps mounted and secured to the primary winding PCB by means of solderable via holes, but does not disclose a design to significantly reduce common mode noise

Method used

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  • Low noise planar transformer
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Examples

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Embodiment Construction

[0039] figure 2 A circuit diagram is shown for a two-switch forward converter 100 having a transformer according to an embodiment of the invention. The converter 100 has an input terminal 14 and an output terminal 32, wherein the input DC voltage V 输入 The ground potential at the relative input terminal 16 is coupled to this input terminal 14, and the output DC voltage V of the converter is set relative to the ground at the output terminal 32 输出 . The converter 100 includes a transformer 142 with a primary winding 112 and a secondary winding 6 . The primary winding 112 is composed of the first winding 4 and the second winding 8 . Each winding has a first end and a second end. The second end of the first winding 4 is connected at node 5 to the first end of the second winding 8 . A power switch 34 is coupled between the first end of the first winding 4 at node 107 and the input terminal 14 . The power switch 36 is connected to the second end of the winding 8 at node 109 . ...

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Abstract

This invention relates to one device and method to reduce co-mode noise from initial coil set to secondary set. For one example, the initial set has two terminals and one PCB layer between two terminals with each PCB layer forms at least one coil. Each PCB layer coil is connection to form initial set with each Terminal connection to the isolated PCB layer overlapped to Form initial set. The second set covers one selected distribution at the middle place between the first and second layers. The nearest coil set to PCB layer is composed of only one coil to reduce co-mode noise. In one alternating sample, the transducer is put in the second to initial distribution with two halves form one PCB set.

Description

technical field [0001] The invention relates to a transformer, in particular to a low-noise planar transformer and a manufacturing method thereof. Background technique [0002] Traditionally, electromagnetic components such as transformers are constructed by winding one or more conductors around a cylindrical or toroidal core. This method of manufacture requires that a conductor such as wire can be wound around the outer surface of the core. The resulting components are relatively expensive, time-consuming to manufacture, and not amenable to miniaturization or automated assembly. [0003] Recently, electromagnetic components have been manufactured using printed circuit board (PCB) manufacturing techniques, in which multiple windings and multiple individual winding turns are formed from a stack of PCB layers (each PCB layer includes a pattern machined on the surface of the PCB layer). one or more conductive traces), or formed from a multi-layer PCB (each layer of the PCB ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/34H01F5/00H01F17/00H01F27/28H01F30/00
CPCH01F17/0013H01F27/2804H01F27/34H01F2027/2819Y10T29/4902
Inventor 苏永智
Owner ASTEC INT LTD
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