CN201138607Y

CN201138607Y - Transformer integrated with LLC inductor

Info

Publication number: CN201138607Y
Application number: CNU2007201721652U
Authority: CN
Inventors: 王奉瑾; 张心益; 从德云
Original assignee: SHENZHEN PUTLY OPTIC-ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: Zhongshan Purunsi Power Supply Equipment Technology Co., Ltd.
Priority date: 2007-09-30
Filing date: 2007-09-30
Publication date: 2008-10-22
Anticipated expiration: 2017-09-30

Abstract

The utility model discloses a transformer integrated with an LLC inductance; the transformer includes a primary winding simultaneously entwined on a plurality of magnetic circuits of the transformer as well as a secondary winding simultaneously entwined on a plurality of magnetic circuits of the transformer; the number of the magenitc circuits surrounded by the primary winding is not the same as the number of the magnetic circuits surrounded by the secondary winding; the numbers of the magenitc circuits surrounded by the primary winding and the secondary winding of the transformer integrated with the LLC inductance of the embodiment of the utility model are not the same to lead the primary winding to generate a leakage inductance; when the secondary winding is short, the transformer becomes an equivalent resonance inductance instantly. Compared with the prior art, the transformer integrated with the LLC inductance of the utility model can greatly save the integration cost of the transformer and the inductance and can simplify the integration technique.

Description

A kind of transformer that is integrated with the LLC inductance

Technical field

The utility model relates to field transformer, relates in particular to a kind of transformer of the LLC of being integrated with inductance.

Background technology

In the application of resonant power, usually need transformer is used in combination with inductance, traditional way is at inductance of the outside of transformer series connection.This way has increased the cost of realizing resonant power and has taken a large amount of spaces, and resonant power needs between the primary inductance of resonant inductance and transformer a fixing ratio is arranged, and adopts the method for outside series inductance, is difficult to draw ratio accurately.Prior art 1 has been introduced a kind of transformer, the elementary winding of this transformer passes through to use different magnetic materials with secondary winding, produces leakage inductance, and the weak point of this method is, need to adopt the magnetic material of Different Rule to produce leakage inductance, realize the technology more complicated.

The utility model content

The utility model embodiment technical problem to be solved is, a kind of transformer of the LLC of being integrated with inductance is provided.Can save the integrated cost of transformer and inductance greatly, and simplify integrated technique.

In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of transformer of the LLC of being integrated with inductance, and this transformer comprises:

Elementary winding on a plurality of magnetic circuit that are wound on described transformer simultaneously;

And be wound on secondary winding on a plurality of magnetic circuits of described transformer simultaneously;

The magnetic circuit number that magnetic circuit number that described elementary winding surrounds and described secondary winding surround is unequal.

The magnetic circuit number of the elementary winding of the transformer that is integrated with the LLC inductance of the utility model embodiment and the encirclement of secondary winding is inequality, make elementary winding produce leakage inductance, described transformer is an equivalent resonant inductance when the secondary winding short circuit, compared with prior art, the transformer of the LLC of being integrated with inductance of the present utility model can be saved the integrated cost of transformer and inductance greatly, and simplifies integrated technique.

Description of drawings

Fig. 1 is that an example structure of the transformer of the LLC of being integrated with inductance of the present utility model is formed schematic diagram;

Fig. 2 is that another example structure of the transformer of the LLC of being integrated with inductance of the present utility model is formed schematic diagram.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.

In the general needed transformer of resonant power, inductive proportions between resonant inductance and the primary winding should be fixed as between 1: 4～1: 7, the utility model embodiment surrounds different magnetic circuit numbers by multiple magnetic circuit transformer being designed to elementary winding with secondary winding, like this, when the secondary winding short circuit of described multiple magnetic circuit transformer, described multiple magnetic circuit transformer can equivalence be a resonant inductance, because make elementary winding and secondary winding surround the demand of magnetic circuit number inequality and winding parameter simultaneously (such as coil turn, the magnetic gap size) control is easy to realize, and the ratio between consequent equivalent resonant inductance and the primary is also more stable, so adopt this programme just can be met inductive proportions between resonant inductance and the primary winding and be fixed as requirement between 1: 4～1: 7 with the extra cost that increases hardly.

Fig. 1 is that the structure of an embodiment of the transformer of the LLC of being integrated with inductance of the present utility model is formed schematic diagram.As shown in Figure 1, the transformer that is integrated with the LLC inductance of present embodiment comprises 5 magnetic circuit (magnetic circuits 1 that 5 magnetic cores form, magnetic circuit 2, magnetic circuit 3, magnetic circuit 4 and magnetic circuit 5) and be wound on elementary winding A and secondary winding B on described 5 magnetic circuits, wherein, elementary winding A is wound on 5 magnetic posts of described transformer simultaneously, secondary winding B is wound on three magnetic circuit (magnetic circuits 2 in centre of described transformer simultaneously, magnetic circuit 3 and magnetic circuit 4) on, because the magnetic circuit number that elementary winding A and secondary winding B surround is inequality, then this transformer village is in leakage inductance, in the present embodiment, when secondary winding B short circuit, this transformer equivalence is a resonant inductance, and the inductive proportions between the elementary winding of described resonant inductance and transformer can be 1: 5.Such as, when elementary winding A coiling 20 circles, secondary winding B coiling 3 circles, and when the magnetic gap between described 5 magnetic circuits was 0.15 millimeter, the equivalent resonant inductance that obtains was 80uH, the primary inductance of transformer is 400uH.

Fig. 2 is that the structure of another embodiment of the transformer of the LLC of being integrated with inductance of the present utility model is formed schematic diagram.As shown in Figure 2, the transformer that is integrated with the LLC inductance of present embodiment comprise 7 magnetic circuits (magnetic circuit 1, magnetic circuit 2, magnetic circuit 3, magnetic circuit 4, magnetic circuit 5, magnetic circuit 6 and magnetic circuit 7) that 7 magnetic cores form with

And be wound on elementary winding A and secondary winding B on described 7 magnetic circuits, wherein, elementary winding A is wound on 7 magnetic circuits of described transformer simultaneously, secondary winding B is wound on 5 magnetic circuits (magnetic circuit 1, magnetic circuit 2, magnetic circuit 3, magnetic circuit 4 and magnetic circuit 5) of described transformer simultaneously, because the magnetic circuit number that elementary winding A and secondary winding B surround is inequality, then this transformer village is in leakage inductance, in the present embodiment, when secondary winding B short circuit, this transformer equivalence is a resonant inductance, and the inductive proportions between the elementary winding of described resonant inductance and transformer is 1: 6.

In the specific implementation, the magnetic circuit number ratio of surrounding when the elementary winding of transformer and secondary winding not simultaneously, the inductive proportions between the elementary winding of the transformer of the resonant inductance of the equivalent inductance of generation also can be inequality.Because the demand and winding parameter (such as coil turn, the magnetic gap size) control that make elementary winding and secondary winding surround magnetic circuit number inequality simultaneously are easy to realize, and the ratio between consequent equivalent resonant inductance and the primary is also more stable, so adopt this programme just can be met inductive proportions between resonant inductance and the primary winding and be fixed as requirement between 1: 4～1: 7 with the extra cost that increases hardly.

In the specific implementation, elementary winding described in the embodiment of the invention and/or secondary winding are one of them or its combination in any of the equivalent winding three that makes of coil windings, planar conductor winding or printed circuit board (PCB).Described magnetic core is the silicon steel sheet magnetic core of U-shaped magnetic core, CD iron core, circular stem stem magnetic core or band newel.

Above disclosed only is a kind of preferred embodiment of the utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.

Claims

1, a kind of transformer that is integrated with the LLC inductance is characterized in that, comprising:

2, the transformer that is integrated with the LLC inductance as claimed in claim 1 is characterized in that,

Described transformer comprises 5 magnetic circuits that 5 magnetic cores form, an elementary winding and a secondary winding;

Described elementary winding is wound on 5 magnetic circuits of described transformer simultaneously;

Described secondary winding is wound on three magnetic circuits in centre of described transformer simultaneously.

3, the transformer that is integrated with the LLC inductance as claimed in claim 1 is characterized in that,

Described transformer comprises 7 magnetic circuits that 7 magnetic cores form, an elementary winding and a secondary winding;

Described elementary winding is wound on 7 magnetic circuits of described transformer simultaneously;

Described secondary winding is wound on 5 magnetic circuits of described transformer simultaneously, and described 5 magnetic circuits comprise the magnetic circuit that the side column of described transformer forms.

4, as each described transformer that is integrated with the LLC inductance among the claim 1-3, it is characterized in that described elementary winding and/or secondary winding are one of them or its combination in any of the equivalent winding three that makes of coil windings, planar conductor winding or printed circuit board (PCB).

As claim 2 or the 3 described transformers that are integrated with the LLC inductance, it is characterized in that 5, described magnetic core is the silicon steel sheet magnetic core of U-shaped magnetic core, CD iron core, circular stem stem magnetic core or band newel.