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Switching power supply, flyback converter and transformer

A flyback converter and transformer technology, applied in the direction of transformers, inductors, regulating electrical variables, etc., can solve the problems of reducing circuit conversion efficiency and coupling coefficient, and achieve the effect of EMI optimization and reduction of common mode current.

Active Publication Date: 2017-12-26
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there will be coupling capacitance between the shielding winding and the secondary winding. Due to the existence of the shielding winding, the coupling coefficient of the primary and secondary windings in the transformer will be reduced, thereby reducing the conversion efficiency of the circuit.

Method used

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  • Switching power supply, flyback converter and transformer
  • Switching power supply, flyback converter and transformer
  • Switching power supply, flyback converter and transformer

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Embodiment Construction

[0045] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0046] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0047] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

The invention discloses a switching power supply, a flyback converter and a transformer. By dividing the primary winding into two parts, the first primary winding and the second primary winding, the power switch is connected to the first primary winding and the second primary winding. Between the two primary windings, at the same time, in the transformer, the secondary winding is arranged between the first primary winding and the second primary winding in the radial direction of the magnetic core, so that the first primary winding and the secondary winding The direction of the current between the second primary winding and the secondary winding is opposite to that of the current, thereby reducing the common mode conduction current between the primary and secondary windings. Therefore, the optimization of EMI can be realized without using the shielding winding and the Y capacitor, and the fill factor and coupling efficiency of the transformer can be increased while reducing the number of components.

Description

technical field [0001] The invention relates to power electronics technology, in particular to a switching power supply, a flyback converter and a transformer. Background technique [0002] The power density and volume requirements of power converters are getting higher and higher, and its wide application inevitably brings about electromagnetic compatibility problems. The current jump and voltage jump generated by the switching process of the power switch in the power converter will cause serious conducted electromagnetic interference, harmonic interference, and strong electromagnetic field radiation. [0003] Conducted disturbances appear as common-mode (asymmetrical) and differential-mode (symmetrical) of voltage or current. The internal mechanism of common mode (CM) conduction interference and differential mode (DM) conduction interference is different. Common mode interference refers to the loop interference formed by the phase line, the parasitic capacitance to the gr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/44H01F27/30
CPCH02M3/33507H01F38/42H02M1/44
Inventor 黄秋凯李新磊胡志亮金超鹏
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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