CN202049852U

CN202049852U - Transformer for photovoltaic inverter

Info

Publication number: CN202049852U
Application number: CN2011201195494U
Authority: CN
Inventors: 仇亮安
Original assignee: SHINENERGY TECHNOLOGY (SHANGHAI) Ltd
Current assignee: SHINENERGY TECHNOLOGY (SHANGHAI) Ltd
Priority date: 2011-04-21
Filing date: 2011-04-21
Publication date: 2011-11-23
Anticipated expiration: 2021-04-21

Abstract

The utility model discloses a transformer for a photovoltaic inverter, which comprises a transformer body. A reactor is arranged in the transformer body, the reactor and the transformer body share a coil winding, an iron core of the transformer body is divided into a main iron core and an auxiliary iron core, the main iron core forms a main flux circuit, and the auxiliary iron core forms a leakage flux circuit. Silicon steel sheets are crossed and laminated via diagonal joints so as to form the main iron core. The coil winding is a winding structure with a core column. The reactor is arranged in the transformer, so that a filter reactor of the photovoltaic inverter is omitted, the volume and the weight of the photovoltaic inverter are effectively reduced, the load loss of the transformer is reduced, and the efficiency of the transformer is improved.

Description

The photovoltaic DC-to-AC converter transformer

Technical field

The utility model relates to a kind of transformer, particularly a kind of photovoltaic DC-to-AC converter transformer.

Background technology

The direct current that solar cell produces must change into alternating current by inverter and just can be used for civilian and production, unavoidably will lose a part of energy in the conversion process.The energy transformation efficiency of inverter has determined the photovoltaic generating system rate of return on investment.As the transformer and the reactor of one of inverter core component, the height of its efficient directly influences the efficient of overall optical photovoltaic generating system.

At present, the most separation schemes that adopt transformer transformation and reactor filtering of field of photovoltaic power generation exist parts many, and volume is bigger, and loss is big, the shortcoming that weight is big.Transformer core adopts direct crack structure in addition, and no-load loss is bigger, and the efficient under different loads is relatively low.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of photovoltaic DC-to-AC converter transformer at the existing technical problem of existing photovoltaic DC-to-AC converter, to improve the efficient of photovoltaic DC-to-AC converter.

Technical problem to be solved in the utility model can be achieved through the following technical solutions:

The photovoltaic DC-to-AC converter transformer, comprise a transformer, it is characterized in that, a built-in reactor in described transformer, the shared coil windings of described reactor and described transformer, the iron core of this transformer is divided into main iron core and secondary iron core, and wherein main iron core constitutes the main flux loop, and secondary iron core constitutes the leakage flux loop.

In preferred embodiment of the utility model, described main iron core is that silicon steel sheet adopts mitre intersection stack structure to make.

In preferred embodiment of the utility model, described coil windings adopts belt carcass post winding structure.

The beneficial effects of the utility model are: adopt transformer built-in reactor scheme, make photovoltaic DC-to-AC converter reduce by a filter reactor, effectively reduced volume and weight, and reduced transformer load loss, improved transformer efficiency; In order to reduce the directly shortcoming of crack structure no-load performance difference of tradition, main iron core adopts mitre structure stack manner, iron yoke and stem seam crossing magnetic property have been improved, reduced no-load loss, improve the efficient of transformer under different loads, thereby made the photovoltaic inversion system arrive higher European efficient; Adopt band stem coiling, changed traditional mounting coil structure, guaranteed the consistency of coiling and assembling.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

Referring to Fig. 1, photovoltaic DC-to-AC converter transformer of the present utility model, comprise main iron core 1, secondary iron core 2, coil windings 3, wherein main iron core 1 is a transformer core, secondary iron core 2 is a core of reactor, coil windings 3 adopts the band stem to be wound on main iron core 1 and the secondary iron core 2, the coil sections winding 31 that wherein is wound on main iron core 1 stem stem constitutes transformer, and another part coil windings 32 that is wound on secondary iron core 2 stem stems constitutes reactor, the utility model is by combining transformer and reactor, and adopts same coil windings 3, saved winding material, reduce load loss effectively, improved the efficient of transformer.

Because the utility model can be adjusted the leakage inductance size by changing the area and the stem air gap of secondary iron core 2, realizes high impedance, satisfies the filtering requirements of system.

The silicon steel sheet of main iron core 1 of the present utility model mitre stacked system has improved iron core seam crossing magnetic property, has reduced no-load loss, thereby has improved the efficient of transformer under different loads.

Coil windings 3 of the present utility model in addition adopts belt carcass post coiling mode, has changed traditional mounting coil structure, has guaranteed the consistency of coiling and assembling.

More than show and described basic principle, principal character and the advantage of the present utility model of utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. photovoltaic DC-to-AC converter transformer, comprise a transformer, it is characterized in that, a built-in reactor in described transformer, the shared coil windings of described reactor and described transformer, the iron core of this transformer is divided into main iron core and secondary iron core, and wherein main iron core constitutes the main flux loop, and secondary iron core constitutes the leakage flux loop.

2. photovoltaic DC-to-AC converter transformer as claimed in claim 1 is characterized in that, described main iron core is that silicon steel sheet adopts mitre intersection stack structure to make.

3. photovoltaic DC-to-AC converter transformer as claimed in claim 1 is characterized in that, described coil windings adopts belt carcass post winding structure.