CN219575365U - Double-tube series flyback transformer - Google Patents

Abstract

The utility model relates to the technical field of transformers, in particular to a double-tube series flyback transformer. The double-tube series flyback transformer of the present utility model comprises: a bobbin for the winding; a secondary winding wound on the skeleton and at least two groups of primary windings; wherein each primary winding comprises at least two winding groups with double-layer structures; two winding groups of one primary winding are used as an intermediate layer, and two winding groups of the other winding are respectively arranged on the upper part and the lower part of the intermediate layer; the winding groups in the secondary winding are crossly wound among the winding groups in each primary winding. The secondary winding and at least two groups of primary windings are staggered and layered, and the primary windings are connected in series in an internal-external staggered manner, so that the leakage inductance of the ultra-low secondary winding layer is realized, the difference of inductance of the two primary windings is greatly reduced, the high voltage-resistant insulation requirement of the primary side and the secondary side is met, the method is applied to a series flyback circuit, the voltage-equalizing performance of the circuit is improved, the voltage stress of a switching tube is effectively reduced, and the power conversion efficiency is improved.

Description

Double-tube series flyback transformer

Technical Field

The utility model relates to the technical field of transformers, in particular to a double-tube series flyback transformer.

Background

In recent years, with the rapid development of new energy industries such as photovoltaic power generation, the matched industrial control power supply needs to be applied, the direct current power supply voltage can reach 200-1200V or even higher, a circuit structure with double-tube series connection or input series connection can be adopted to solve the problem of over-high voltage stress of a switching tube, and leakage inductance needs to be controlled at a very low level to improve the efficiency of the converter, and an original secondary side staggered winding method is generally adopted.

For example, the utility model patent with the patent number of CN217361343U discloses a low-leakage-inductance high-frequency transformer, which can effectively increase the coupling between each turn of windings of a primary side and a secondary side and reduce leakage inductance by winding the primary side winding and the secondary side winding in parallel with the winding structure of 2 primary side and secondary side winding layers, but the mode still has the advantages that the primary side winding is positioned near and far from a magnetic core, and obvious inductance difference exists; the voltage stress deviation of the upper switching tube and the lower switching tube and the excessive temperature rise deviation of the switching tube caused by the transmission power difference result in the risk of product failure.

Disclosure of Invention

In order to solve the technical problems mentioned in the background art, the utility model provides a double-tube series flyback transformer.

The utility model provides a double-tube series flyback transformer, which comprises: a bobbin for the winding;

a secondary winding wound on the skeleton and at least two groups of primary windings; wherein the method comprises the steps of

Each primary winding comprises at least two winding groups with double-layer structures;

two winding groups of one primary winding are used as an intermediate layer, and two winding groups of the other winding are respectively arranged on the upper part and the lower part of the intermediate layer; and

the winding groups in the secondary winding are crossly wound among the winding groups in each primary winding.

Further, insulating tapes are arranged between the winding groups of each layer.

Further, the dual-tube series flyback transformer further comprises:

an auxiliary power supply winding;

the auxiliary power supply winding is positioned on the outermost layer of the transformer.

The double-tube series flyback transformer has the beneficial effects that the secondary winding and at least two groups of primary windings are staggered and layered, and the primary windings are connected in series in an internal-external staggered manner, so that the leakage inductance of the ultra-low secondary winding layer is realized, the difference of inductance of the two primary windings is greatly reduced, the high voltage-resistant insulation requirement of the primary side and the secondary side is met, and the transformer is applied to a series flyback circuit, so that the voltage equalizing performance of the circuit is improved, the voltage stress of a switching tube is effectively reduced, and the power supply conversion efficiency is improved.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and drawings.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a transformer winding structure in a double-tube series flyback transformer of the present utility model;

fig. 2 is an electrical polarity diagram of the dual-tube series flyback transformer of the present utility model.

In the figure: the winding 10 on two sides of the framework, the winding 11 in the middle layer, the secondary winding 2, the auxiliary power supply winding 3 and the insulating adhesive tape 4.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 and 2, the present embodiment provides a dual-tube series flyback transformer, including: a bobbin for the winding; and secondary windings (N2, N4, N6) and at least two groups of primary windings wound on the skeleton; wherein each primary winding comprises at least two winding groups with double-layer structures; two winding groups of one primary winding are used as an intermediate layer, and two winding groups of the other winding are respectively arranged on the upper part and the lower part of the intermediate layer; and winding groups in the secondary winding are crossly wound among the winding groups in each primary winding.

Specifically, as shown in fig. 1 and 2, a group of primary windings are arranged in series corresponding to N1 and N7, so as to maximize the coupling electromotive forces of the primary and secondary windings; the other group of primary windings are corresponding to N3 and N5 and are arranged in series, so that the effect of balancing the induced electromotive force is achieved; and as two layers of winding groups in a group of primary windings, N1-1 and N1-2 and N7-1 and N7-2 are respectively corresponding; two layers of winding groups in the other primary winding correspond to N3-1 and N3-2, and N5-1 and N5-2, respectively.

In the embodiment, through the staggered layered windings of the two groups of primary windings and the secondary windings, the mode of internal and external staggered serial connection is adopted by the winding groups with double-layer structures in the primary windings, so that the leakage inductance of the ultralow secondary windings is realized, the difference of inductance of the two primary windings is greatly reduced, the high voltage-resistant insulation requirement of the primary side and the secondary side is met, in addition, the transformer is applied to a serial flyback circuit, the voltage-sharing performance of the circuit is improved, the voltage stress of a switching tube is effectively reduced, and the power conversion efficiency is improved.

As shown in fig. 1 and 2, in the present embodiment, the secondary winding 2 includes: a secondary winding N2 located between the primary winding N1 and the primary winding N3; a secondary winding N4 located between the primary winding N3 and the primary winding N5; a secondary winding N6 located between the primary winding N5 and the primary winding N7 divides the secondary winding 2 into 3 parts (N2, N4, and N6) and is cross-wound with the primary winding so as to have as small leakage inductance as possible.

In this embodiment, the dual-tube series flyback transformer further includes: an auxiliary power supply winding 3; the auxiliary power supply winding 3 corresponds to the winding N8 and is positioned at the outermost layer of the transformer, so that leakage inductance is made as small as possible.

In this embodiment, the insulating tape 4 is wound between the winding groups, that is, each layer of winding group is uniformly laid with one layer and isolated by the insulating tape 4, so as to maximally increase the primary and secondary coupling areas, and simultaneously avoid the increase of parasitic capacitance and leakage inductance caused by multiple layers.

In summary, the double-tube series flyback transformer realizes ultra-low secondary winding layer leakage inductance by the staggered layered windings of the secondary winding and at least two groups of primary windings and by adopting the internal and external staggered series connection mode of the primary windings, greatly reduces the difference of inductance of the two primary windings, and meets the high voltage-withstanding insulation requirement of the primary side and the secondary side.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims (3)

1. A dual-tube series flyback transformer, comprising:

a bobbin for the winding;

a secondary winding wound on the skeleton and at least two groups of primary windings; wherein the method comprises the steps of

Each primary winding comprises at least two winding groups with double-layer structures;

two winding groups of one primary winding are used as an intermediate layer, and two winding groups of the other winding are respectively arranged on the upper part and the lower part of the intermediate layer; and

the winding groups in the secondary winding are crossly wound among the winding groups in each primary winding.

2. A dual-tube series flyback transformer as set forth in claim 1 wherein,

insulating adhesive tapes are arranged between the winding groups of each layer.

3. The dual-tube series flyback transformer of claim 2 further comprising:

an auxiliary power supply winding;

the auxiliary power supply winding is positioned on the outermost layer of the transformer.