CN204668134U

CN204668134U - Current transformer

Info

Publication number: CN204668134U
Application number: CN201520364414.2U
Authority: CN
Inventors: 向茂溪
Original assignee: Astec International Ltd
Current assignee: Astec International Ltd
Priority date: 2015-05-29
Filing date: 2015-05-29
Publication date: 2015-09-23
Anticipated expiration: 2025-05-29

Abstract

The disclosure relates to a kind of current transformer.Comprise according to current transformer of the present disclosure: iron core, it comprises two U-shaped iron cores, and each U-shaped iron core has crossbeam and lateral column, and two U-shaped iron cores are staggered relatively with the window forming iron core; Armature winding, it is through the window of iron core; And secondary winding, its window through iron core is also wrapped on the lateral column of at least one in two U-shaped iron cores.According to current transformer of the present disclosure, there is high electric current, low profile and small size.

Description

Current transformer

Technical field

The disclosure relates to instrument transformer field, relates to a kind of current transformer particularly.

Background technology

This part provides the background information relevant with the disclosure, and this is prior art not necessarily.

Along with ever-increasing to the efficiency of modular power source (BMP) module and the requirement of power density, passive component needs less as magnet assembly and needs less encapsulation.Along with power increases, input and output electric current also increases.This means the electric current that current transformer needs process higher or encapsulation less while even needing to process higher electric current.

In addition, for BMP product, its total height is 11.6mm to the maximum, so the total height of current transformer is 4.0mm to the maximum.The current transformer of known structure is not suitable for the low looking products of BMP.Therefore, present disclose provides a kind of current transformer of new construction, while improving nominal primary RMS electric current, there is little size.

Utility model content

This part provides general summary of the present disclosure, instead of the full disclosure of its four corner or its whole feature.

Object of the present disclosure is the current transformer providing a kind of new construction, and it is responded to for high-power electric current.Compared to known current transformer, the current transformer of new construction of the present disclosure has the larger space for winding, and it allows to use thicker winding, to reduce DCR and the power loss of instrument transformer.

According to one side of the present disclosure, provide a kind of current transformer, comprising: iron core, it comprises two U-shaped iron cores, and each U-shaped iron core has crossbeam and lateral column, and described two U-shaped iron cores are staggered relatively with the window forming described iron core; Armature winding, it is through the window of described iron core; And secondary winding, its window through described iron core is also wrapped on the lateral column of at least one in described two U-shaped iron cores.

Preferably, can be I type Copper Foil according to the armature winding of current transformer of the present disclosure, and this I type Copper Foil can at end of incoming cables and leading-out terminal bent angle.

Preferably, can be U-shaped Copper Foil according to the armature winding of current transformer of the present disclosure, it walks around the crossbeam of in two U-shaped iron cores.

Preferably, comprise skeleton further according to current transformer of the present disclosure, armature winding and secondary winding separate by this skeleton.

Preferably, can be embedded in inside skeleton according to the armature winding of current transformer of the present disclosure or be placed in below skeleton.

Preferably, can be 1 circle according to the armature winding of current transformer of the present disclosure.

Preferably, can be designed as tens circles to hundreds of circle according to the secondary winding of current transformer of the present disclosure.

Preferably, may further include armature winding paster packaging SMT pin, secondary winding paster packaging SMT pin and secondary winding hanging wire pin according to current transformer of the present disclosure.

Use and according to an advantage of current transformer of the present disclosure be: known current transformer needs to increase size (length) to respond to higher electric current.And instrument transformer of the present disclosure, not needing to increase height by only increasing less size (instrument transformer cross-sectional area and winding area increase slightly) just can increase electric current.Therefore, current transformer of the present disclosure is applicable to the BMP product of maximum height limit due to the requirement of low profile.

Use and according to another advantage of current transformer of the present disclosure be: be easy to increase electric current and slightly change, such as, by increasing the column length of iron core, can increase the width of winding, secondary winding also can use thicker wire as the winding area increased simultaneously.

From the description provided at this, further applicability region will become obvious.Description in this summary and the object of specific examples just in order to illustrate, and be not intended to limit the scope of the present disclosure.

Accompanying drawing explanation

The accompanying drawing described here enforcement that just not all is possible in order to the object of the signal of selected embodiment, and be not intended to limit the scope of the present disclosure.In the accompanying drawings:

Fig. 1 shows the schematic diagram of the E shaped iron core of known instrument transformer;

Fig. 2 shows the schematic diagram of the U-shaped iron core according to current transformer of the present disclosure;

Fig. 3 shows the structural representation of known current transformer; And

Fig. 4 shows the structural representation according to current transformer of the present disclosure.

Although the disclosure easily stands various amendment and replacement form, its specific embodiment is shown in the drawings as an example, and describes in detail at this.But should be understood that, do not intend the disclosure to be restricted to disclosed concrete form to the description of specific embodiment at this, but on the contrary, disclosure object will cover all modifications, the equivalence that drop within spirit and scope of the present disclosure and replace.It should be noted that run through several accompanying drawing, corresponding label indicates corresponding parts.

Embodiment

With reference now to accompanying drawing, example of the present disclosure is described more fully.Below describe in fact just exemplary, and be not intended to the restriction disclosure, application or purposes.

Provide example embodiment, so that the disclosure will become detailed, and its scope will be passed on fully to those skilled in the art.Set forth numerous specific detail as the example of particular elements, apparatus and method, providing the detailed understanding to embodiment of the present disclosure.Will be apparent that to those skilled in the art, not need to use specific details, example embodiment can be implemented by many different forms, and they should not be interpreted as limiting the scope of the present disclosure.In some example embodiment, do not describe well-known process, well-known structure and well-known technology in detail.

Known paster encapsulation (SMT) current transformer is as Datatronic CT319, and its (8.13mm length × 6mm width × 4.10mm height) can process 20Amps (root mean square RMS counts) primary side is maximum.Known instrument transformer adopts E shaped iron core as shown in Figure 1, and it has crossbeam 101, center pillar 103 and two lateral columns 102, and wherein, two lateral columns 102 form two windows as shown at 104 respectively with center pillar 103.Particularly, in known instrument transformer, as shown in Figure 3, two E shaped iron cores are staggered relatively to form the EE iron core 301 being surrounded by two windows.Former limit winding 304,305 and vice-side winding 306 are separated by skeleton 307 in the window surrounded.Former limit winding 304,305 uses U-shaped Copper Foil, and it moves into from a window, through EE iron core 301 center pillar 302 and lay out from another window.Vice-side winding 306 is wrapped on the center pillar 302 of EE iron core 301 by two windows.

Because U-shaped Copper Foil to move into for axle with the center pillar 302 of EE iron core 301 and lays out, therefore, its D.C. resistance (DCR) can not reduce further.And vice-side winding 306 is wrapped on the center pillar 302 of EE iron core 301 by two windows, and therefore its size is limited.

In addition, in order to obtain the current transformer of high turn ratio as 1:100, vice-side winding needs to use higher American wire gage (AWG) meter, makes it thinner and has higher DCR.And winding is thinner, more easily damage in an assembling process.And the DCR of instrument transformer is higher, its temperature rise is higher and heat drop is lower.

In order to increase induced current, the size of instrument transformer must significantly increase (for former limit winding, needs wider U-shaped Copper Foil; And for vice-side winding, large space must be had) to reduce DCR.

Fig. 1 shows the schematic diagram of the E shaped iron core of known instrument transformer; And Fig. 2 shows the schematic diagram of the U-shaped iron core according to current transformer of the present disclosure.

Fig. 3 shows the structural representation of known current transformer.As shown in Figure 3, two E shaped iron cores are staggered relatively to form the EE iron core 301 being surrounded by two windows.Former limit winding 304 enters from window on one side around the center pillar 302 of EE iron core 301, and lay out from the window of another side, the shape of winding is U-shaped Copper Foil.Under identical instrument transformer size condition, because winding will move into and lay out, be exactly total the width of the width EE iron core of U-shaped like this Copper Foil deducts the width of EE iron core middle column and two lateral columns, then divided by 2; And as shown in Figure 2, U-shaped iron core has the only window 203 surrounded by crossbeam 201 and two lateral columns 202.And, can be I type Copper Foil according to the shape of instrument transformer of the present disclosure former limit winding.Therefore, under identical instrument transformer size condition, be exactly total the width of the U-shaped iron core of width of I type Copper Foil deducts the width of U-shaped iron core two lateral columns.Therefore, 2 times of the U-shaped Copper Foil of the instrument transformer of known employing E shaped iron core according to the width of the I type Copper Foil of the instrument transformer of the U-shaped iron core of employing of the present disclosure, thus can by 2 times of electric currents to the instrument transformer of the U-shaped Copper Foil of employing according to the instrument transformer of employing I type Copper Foil of the present disclosure.The lifting of electric current is detected under achieving same size.

Fig. 4 shows the structural representation according to current transformer of the present disclosure.As shown in Figure 4, can comprise according to current transformer of the present disclosure: iron core 401, it comprises two U-shaped iron cores, and each U-shaped iron core has crossbeam and lateral column, and two U-shaped iron cores are staggered relatively with the window forming this iron core 401; Armature winding 402, it is through the window of iron core 401; And secondary winding 403, its window through iron core 401 is also wrapped on the lateral column of at least one in two U-shaped iron cores.

According to an embodiment of the present disclosure, the UU iron core 401 be made up of two U-shaped iron cores can vertically be placed, to form the window of this UU iron core 401.UU iron core 401 comprises two crossbeams and two lateral columns.Former limit winding 402 such as I type Copper Foil can pass the window of UU iron core 401 and be embedded in inside skeleton 404.Alternatively, former limit winding 402 also can not be embedded in inside skeleton 404, but the window being through UU iron core 401 is placed on below skeleton 404.Vice-side winding 403 can pass the window of UU iron core 401 and be wrapped on the lateral column of of UU iron core 401.Alternatively, the top that vice-side winding 403 mechanically can walk around skeleton 404 is wrapped on a lateral column of UU iron core 401.Former limit winding 402 and vice-side winding 403 are insulating Design.

Use according to current transformer of the present disclosure, former limit winding can be wider and length is shorter, DCR is lower, temperature rise is lower and specified RMS electric current is higher.And because former limit winding and vice-side winding separate, the size of vice-side winding is not limited to the current transformer in traditional meaning.Further, the width due to UU core window is the twice of EE iron core, and the winding space of vice-side winding is increased to twice.That is vice-side winding, under the condition of the identical number of turn, can use thicker wire diameter, be therefore not easy fracture, and there is lower DCR, lower temperature rise, thus also improve heat drop volume; And under identical wire diameter condition, can around the more number of turn.

In one embodiment, when being I type Copper Foil according to the former limit winding 402 of current transformer of the present disclosure, at end of incoming cables and leading-out terminal bent angle, Reflow Soldering can be crossed to facilitate SMT encapsulation.

In one embodiment, when being U-shaped Copper Foil according to the former limit winding 402 of current transformer of the present disclosure, it can walk around a crossbeam of UU iron core 401.

In one embodiment, can be 1 circle according to the former limit winding 402 of current transformer of the present disclosure, it can be embedded in inside skeleton 404 or be placed in below skeleton 404.Vice-side winding 403 can be designed as tens circles to hundreds of circle, and the top mechanically can walking around skeleton 404 is wrapped on a lateral column of UU iron core 401.In addition, vice-side winding 403 partly can be exposed to outside, contributes to thermal radiation like this.

In one embodiment, may further include armature winding paster packaging SMT pin 407, secondary winding paster packaging SMT pin 406 and secondary winding hanging wire pin 405 according to current transformer of the present disclosure.

According to an embodiment of the present disclosure, the current transformer with 8.3mm length × 6.4mm width × 4.0mm height can export 30A RMS electric current, and the volume of this current transformer is 8% of known current transformer volume.

According to another embodiment of the present disclosure, if the length of current transformer and width each increase 0.5mm, then can respond to the electric current of 35A RMS, the volume of this current transformer is 10.7% of the volume of known current transformer.Such as, according to current transformer of the present disclosure as CT320, it can process 35A (RMS) electric current.If but adopted known instrument transformer, its size must be increased to 18mm length × 14.2mm width × 10mm height.

Compare known current transformer, according to current transformer of the present disclosure, its former limit winding can be wider and shorter, and DCR declines significantly, thus induced current can be increased to 30A.And if adopt thicker former limit winding, induced current can be increased to 40A, even larger.This can meet 1000W or 1750W of up-to-date high power DC-DC module as having 45-56Vdc input range and export.

Can not increase according to current transformer height of the present disclosure, therefore be more suitable for BMP product.

Although describe embodiment of the present disclosure by reference to the accompanying drawings in detail above, it should be understood that execution mode described above is just for illustration of the disclosure, and do not form restriction of the present disclosure.For a person skilled in the art, can make various changes and modifications above-mentioned execution mode and not deviate from essence of the present disclosure and scope.Therefore, the scope of the present disclosure is only limited by appended claim and equivalents thereof.

Claims

1. a current transformer, is characterized in that comprising:

Iron core, it comprises two U-shaped iron cores, and each U-shaped iron core has crossbeam and lateral column, and described two U-shaped iron cores are staggered relatively with the window forming described iron core;

Armature winding, it is through the window of described iron core; And

Secondary winding, its window through described iron core is also wrapped on the lateral column of at least one in described two U-shaped iron cores.

2. current transformer as claimed in claim 1, it is characterized in that, described armature winding is I type Copper Foil.

3. current transformer as claimed in claim 2, it is characterized in that, described I type Copper Foil is at end of incoming cables and leading-out terminal bent angle.

4. current transformer as claimed in claim 1, it is characterized in that, described armature winding is U-shaped Copper Foil, and it walks around the crossbeam of in described two U-shaped iron cores.

5. current transformer as claimed in claim 1, it is characterized in that, described current transformer comprises skeleton further, and described armature winding and described secondary winding separate by described skeleton.

6. current transformer as claimed in claim 5, it is characterized in that, described armature winding is embedded in inside described skeleton or is placed in below described skeleton.

7. the current transformer according to any one of claim 1 to 6, is characterized in that, described armature winding is 1 circle.

8. the current transformer according to any one of claim 1 to 6, is characterized in that, described secondary winding is designed to tens circles to hundreds of circle.

9. current transformer as claimed in claim 7, it is characterized in that, described secondary winding is designed to tens circles to hundreds of circle.

10. current transformer as claimed in claim 1, it is characterized in that, described current transformer comprises armature winding paster packaging SMT pin, secondary winding paster packaging SMT pin and secondary winding hanging wire pin further.