CN103531339A

CN103531339A - Transformer

Info

Publication number: CN103531339A
Application number: CN201310528637.3A
Authority: CN
Inventors: 罗宇浩
Original assignee: Altenergy Power System Inc
Current assignee: Yuneng Technology Co ltd
Priority date: 2013-10-30
Filing date: 2013-10-30
Publication date: 2014-01-22
Anticipated expiration: 2033-10-30
Also published as: CN103531339B

Abstract

The invention provides a transformer which is applied to an interleaving flyback circuit. The transformer comprises a transformer upper magnetic core, a secondary side framework, a secondary side winding, auxiliary side pins, a primary side framework, a primary side winding, primary side pins and a transformer lower magnetic core. The transformer upper magnetic core and the transformer lower magnetic core are provided with two circular rings which are an outer ring and an inner ring, a center post is positioned at the center of the outer ring and the center of the inner ring, two grooves are formed between the outer ring, the inner ring and the center post and are an outer groove and an inner groove, the secondary side framework is located in the outer groove, and the primary side framework is located in the inner groove. The transformer is applied to the interleaving flyback circuit, two transformers are integrated together in a mode of sharing part of a magnetic circuit, the size of the whole transformer can be reduced, efficiency and the power density of the transformer are improved. By enabling a main circuit and an auxiliary circuit to share the frameworks and enabling winding to be performed simultaneously, mismatching of the main circuit and the auxiliary circuit is eliminated, and the performance of the transformer is improved.

Description

Transformer

Technical field

The present invention relates to transformer technology field, specifically, the present invention relates to a kind of transformer that is applicable to crisscross parallel circuit of reversed excitation.

Background technology

Transformer is magnetic element important in converters, is also the key factor that the miniaturization of restriction converters, efficiency and power density promote.Crisscross parallel circuit of reversed excitation structure is conducive to increase power output, reduces ripple, thereby can reduce filter circuit.In the circuit occasion of interleaving inverse excitation parallel circuits application, such as solar photovoltaic grid-connection crisscross parallel flyback Miniature inverter, two flyback transformers are key factors of the further miniaturization of restriction Miniature inverter.If two transformers are integrated, just can reduce the overall volume of transformer, improve efficiency and the power density of converter.

Fig. 1-1 is the application schematic diagram of a kind of discrete transformer of the prior art in crisscross parallel circuit of reversed excitation, and Fig. 1-2 is the surface structure schematic diagram of the discrete transformer in the crisscross parallel circuit of reversed excitation shown in Fig. 1-1.As Figure 1-1, two-way has respectively transformer 100,100 ', current transformer 101,101 ' and switch element 102,102 '.Transformer 100 and 100 ' in Fig. 1-1 is existing conventional flyback transformer (as shown in Figure 1-2).Current transformer 101,101 ' detects the electric current on transformer 100,100 ' main limit.General staggered complementary as 102,102 ', two switch elements of the switch element in this crisscross parallel circuit of reversed excitation 102,102 ' driving signal with MOSFET.

The circuit of reversed excitation work that interlocks, and due to circuit of reversed excitation, flyback transformer magnetic material usage under Same Efficieney capacity is more, so existing two volume of transformer are larger, magnetic loss is also higher, becomes a bottleneck of this circuit topography miniaturized structure of restriction.In addition, the difference between two transformers also can cause the mismatch of staggered circuit, makes Efficiency Decreasing, and produces electromagnetic compatibility (EMC) interference.

Summary of the invention

A technical problem to be solved by this invention is to provide a kind of integrated transformer that is applicable to crisscross parallel circuit of reversed excitation, reduces the loss of transformer in circuit, reduces the volume of whole circuit, reduces costs.

Another technical problem to be solved by this invention is to provide a kind of integrated transformer that is applicable to crisscross parallel circuit of reversed excitation, reduces the mismatch between crisscross parallel circuit of reversed excitation, raises the efficiency, and reduces EMC and disturbs.

For solving the problems of the technologies described above, the invention provides a kind of transformer, be applicable to crisscross parallel circuit of reversed excitation, it comprises: magnetic core under magnetic core, secondary skeleton, secondary winding, secondary pin, former limit skeleton, former limit winding, former limit pin and transformer on transformer;

Wherein, on described transformer, under magnetic core and described transformer, magnetic core has two annulus, is outer shroud and interior ring, post centered by described outer shroud and described Nei Huan center; Between described outer shroud, described interior ring and described newel, forming two grooves, is water jacket and inside groove; Described secondary skeleton is positioned in described water jacket, and described former limit skeleton is positioned in described inside groove.

Alternatively, described former limit winding is two lines with around, corresponding main road He Cong road respectively, and described former limit pin is at least three, and one be that main road He Cong road is shared, and another two are used respectively for main road He Cong road; The coiling on main road He Cong road and the connected mode of pin are contrary, make the two electric current around on the contrary.

Alternatively, described secondary winding is two lines with around, corresponding main road He Cong road respectively, and described secondary pin is at least three, and one be that main road He Cong road is shared, and another two are used respectively for main road He Cong road; The coiling on main road He Cong road and the connected mode of pin are contrary, make the two electric current around on the contrary.

Alternatively, the coiling on the main road He Cong road that described former limit winding and/or described secondary winding are corresponding is carried out respectively, and coiling opposite direction; The coiling on main road He Cong road and the connected mode of pin are identical, and the electric current that makes the two is around on the contrary.

Alternatively, described transformer is applicable in the crisscross parallel flyback Miniature inverter of solar photovoltaic grid-connection.

Compared with prior art, the present invention has the following advantages:

The present invention is applicable to crisscross parallel circuit of reversed excitation, and the mode by common sparing magnetic circuit integrates two transformers, just can reduce the overall volume of transformer, improves efficiency and the power density of converter.By main road He Cong road, share skeleton, coiling simultaneously, eliminate the mismatch on main road He Cong road, improve the performance of converter.

One aspect of the present invention can reduce the loss of transformer in circuit, reduces the volume of whole circuit, reduces costs, and can reduce the mismatch between crisscross parallel circuit of reversed excitation on the other hand, raises the efficiency, and reduces EMC and disturbs.

Accompanying drawing explanation

The above and other features of the present invention, character and advantage become more obvious by the description by below in conjunction with drawings and Examples, wherein:

Fig. 1-1 is the application schematic diagram of a kind of discrete transformer of the prior art in crisscross parallel circuit of reversed excitation;

Fig. 1-2 is the surface structure schematic diagram of the discrete transformer in the crisscross parallel circuit of reversed excitation shown in Fig. 1-1;

Fig. 2-1 is the topological structure schematic diagram of the applied crisscross parallel circuit of reversed excitation of the transformer of one embodiment of the invention;

Fig. 2-2 are the surface structure schematic diagram of the transformer in the crisscross parallel circuit of reversed excitation shown in Fig. 2-1;

Fig. 3 is the decomposition texture schematic diagram of a kind of discrete transformer of the prior art shown in Fig. 1-2;

Fig. 4 is the decomposition texture schematic diagram of the integrated transformer of the one embodiment of the invention shown in Fig. 2-2;

Fig. 5 is the some work waveform schematic diagram of the applied crisscross parallel circuit of reversed excitation of the transformer of one embodiment of the invention.

Embodiment

Below in conjunction with specific embodiments and the drawings, the invention will be further described; set forth in the following description more details so that fully understand the present invention; but the present invention obviously can implement with the multiple alternate manner that is different from this description; those skilled in the art can do similar popularization, deduction according to practical situations without prejudice to intension of the present invention in the situation that, therefore should be with content constraints protection scope of the present invention of this specific embodiment.

Fig. 2-1 is the topological structure schematic diagram of the applied crisscross parallel circuit of reversed excitation of the transformer of one embodiment of the invention; Fig. 2-2 are the surface structure schematic diagram of the transformer in the crisscross parallel circuit of reversed excitation shown in Fig. 2-1.It should be noted that these and follow-up other accompanying drawing are all only as example, it is not to draw according to the condition of equal proportion, and should not using that this is construed as limiting as the protection range to actual requirement of the present invention.

As shown in Fig. 2-1, wherein adopted integrated transformer 200, replaced two discrete transformers 100,100 ' in Fig. 1-1.The transformer 200 of application integration has not only reduced the volume of crisscross parallel circuit of reversed excitation, and the loss of integrated transformer 200 reduces, and has improved the conversion efficiency of whole circuit.

Introduce the concrete structure of the transformer of the present invention's proposition below, but before this, be to represent contrast, first introduce the concrete structure of transformer of the prior art.Fig. 3 is the decomposition texture schematic diagram of a kind of discrete transformer of the prior art shown in Fig. 1-2.

This transformer has comprised magnetic core 311 under magnetic core 301 on transformer, skeleton 303, winding 305, secondary pin 307, former limit pin 309 and transformer.Wherein winding 305 has comprised former limit winding and secondary winding.

Fig. 4 is the decomposition texture schematic diagram of the integrated transformer of the one embodiment of the invention shown in Fig. 2-2.As shown in Figure 4, this transformer goes for crisscross parallel circuit of reversed excitation, is particularly applicable in the crisscross parallel flyback Miniature inverter of solar photovoltaic grid-connection.This transformer mainly comprises: magnetic core 415 under magnetic core 401, secondary skeleton 403, secondary winding 405, secondary pin 407, former limit skeleton 409, former limit winding 411, former limit pin 413 and transformer on transformer.

Wherein, on transformer, under magnetic core 401 and transformer, magnetic core 415 has two annulus, is outer shroud 417 and interior ring 419, post 421 centered by outer shroud 417 and Nei Huan 419 centers.Between outer shroud 417, interior ring 419 and newel 421, forming two grooves, is water jacket 423 and inside groove 425.Secondary skeleton 403 is positioned at 423 li of water jackets, and former limit skeleton 409 is positioned at 425 li of inside grooves.

In the present embodiment, former limit winding 411 can for two lines with around, ，Yuan limit, corresponding main road He Cong road pin 413 is at least three respectively, one be that main road He Cong road is shared, another two are used respectively for main road He Cong road.The coiling on main road He Cong road and the connected mode of pin are contrary, make the two electric current around on the contrary.

In the present embodiment, secondary winding 405 also can be for two lines be with around, corresponding main road He Cong road respectively, and secondary pin 407 is at least three, and one be that main road He Cong road is shared, and another two are used respectively for main road He Cong road.The coiling on main road He Cong road and the connected mode of pin are contrary, make the two electric current around on the contrary.

Certainly, in the embodiment of a variation, the coiling on the main road He Cong road of former limit winding 411 and/or secondary winding 405 correspondences can be carried out respectively, and coiling opposite direction.The coiling on main road He Cong road and the connected mode of pin are identical, thereby the electric current that makes the two is around on the contrary.

Fig. 5 is the some work waveform schematic diagram of the applied crisscross parallel circuit of reversed excitation of the transformer of one embodiment of the invention.In Fig. 5, driving A500 is the drive signal waveform of switch element 101 in Fig. 2-1, and driving B501 is the drive signal waveform of switching tube 202 in Fig. 2, and two drive signal waveform are staggered complementary.Shown in magnetic flux work diagram 502,503 in integrated transformer 200.Transformer is in the operating state of the magnetization repeating with switching frequency and reset, in common core, partly there is part magnetic flux overlapping, and opposite direction, as shown in dash area in Fig. 5 504, exactly because the magnetic flux of dash area 504 disappear mutually, thereby can reduce magnetic loss, improved efficiency, and common core part can be done little, can save magnetic material, transformer integral body is done little.

Although the present invention with preferred embodiment openly as above, it is not for limiting the present invention, and any those skilled in the art without departing from the spirit and scope of the present invention, can make possible change and modification.Therefore, every content that does not depart from technical solution of the present invention, any modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, within all falling into the protection range that the claims in the present invention define.

Claims

1. a transformer, be applicable to crisscross parallel circuit of reversed excitation, it comprises: magnetic core (415) under magnetic core on transformer (401), secondary skeleton (403), secondary winding (405), secondary pin (407), former limit skeleton (409), former limit winding (411), former limit pin (413) and transformer;

Wherein, under magnetic core on described transformer (401) and described transformer, magnetic core (415) has two annulus, is outer shroud (417) and interior ring (419), post (421) centered by described outer shroud (417) and described interior ring (419) center; Between described outer shroud (417), described interior ring (419) and described newel (421), forming two grooves, is water jacket (423) and inside groove (425); It is inner that described secondary skeleton (403) is positioned at described water jacket (423), and it is inner that described former limit skeleton (409) is positioned at described inside groove (425).

2. transformer according to claim 1, is characterized in that, described former limit winding (411) be two lines with around, difference corresponding main road He Cong road, described former limit pin (413) is at least three, and one is that main road He Cong road shares, and another two are used respectively for main road He Cong road; The coiling on main road He Cong road and the connected mode of pin are contrary, make the two electric current around on the contrary.

3. transformer according to claim 2, is characterized in that, described secondary winding (405) be two lines with around, difference corresponding main road He Cong road, described secondary pin (407) is at least three, and one is that main road He Cong road shares, and another two are used respectively for main road He Cong road; The coiling on main road He Cong road and the connected mode of pin are contrary, make the two electric current around on the contrary.

4. transformer according to claim 1, is characterized in that, the coiling on the main road He Cong road that described former limit winding (411) and/or described secondary winding (405) are corresponding is carried out respectively, and coiling opposite direction; The coiling on main road He Cong road and the connected mode of pin are identical, and the electric current that makes the two is around on the contrary.

5. according to the transformer described in any one in claim 1 to 4, it is characterized in that, described transformer is applicable in the crisscross parallel flyback Miniature inverter of solar photovoltaic grid-connection.