CN203536194U

CN203536194U - Y-capacitor-free transformer

Info

Publication number: CN203536194U
Application number: CN201320709403.4U
Authority: CN
Inventors: 王其明; 林万炯
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-11-05
Filing date: 2013-11-05
Publication date: 2014-04-09
Anticipated expiration: 2023-11-05

Abstract

The utility model discloses a Y-capacitor-free transformer. The Y-capacitor-free transformer comprises a framework, a primary winding wound on the framework, a secondary winding wound on the framework, a magnetic core inserted in the framework, and at least a capacitor component arranged outside the magnetic core in a wrapping manner, wherein the capacitor component comprises at least an insulating layer, a first metal layer and a second metal layer; the first metal layer and the second metal layer are arranged on the two sides of the insulating layer; the first metal layer is electrically connected to the anode of the primary winding; the second metal layer is electrically connected to the cathode of the secondary winding or the ground. As the capacitor component prepared from the insulating layer, the first metal layer and the second metal layer is coated outside the magnetic core, and the capacitor component is then electrically connected to different metal pins of the framework, the purpose of avoiding using the Y- capacitor in a whole power source can be realized, occupation of a use space of a circuit board caused by arrangement of the Y-capacitor on the circuit board of the power source is further avoided, and the requirement on reducing the whole volume of the power source is realized.

Description

A kind of transformer of exempting from Y electric capacity

Technical field

The utility model relates to a kind of electronic devices and components, particularly a kind ofly provides the transformer of exempting from Y electric capacity of using on the power supply of electric energy for LED light fixture.

Background technology

In Switching Power Supply, because main power device is operated on off state, its voltage and current waveform contains abundant high order harmonic component, di/dt and dv/dt can produce the electromagnetic field of alternation in circuit and magnetic element fast for these, because transformer is non-ideal element, between the winding and winding of transformer, between same winding the inside circle and circle, all can there is promulgation electric capacity, just make the electromagnetic field of this alternation can be poured into by coupling the secondary winding of Switching Power Supply, and power supply time time winding exists distributed capacitance to the earth, therefore can form the loop of common mode disturbances.

In order to solve the problem of Electro Magnetic Compatibility, general is all to adopt the common mode/differential mode filter that adds some electric capacity and inductance to form, the interference that decays and pass, at the inner EMI of increasing of transformer, shield simultaneously, to reduce the coupling capacitance between different windings, from source, alleviate the generation that EMI disturbs, simultaneously also need to be in winding have added Y electric capacity between primary and secondary on skeleton.By adding Y electric capacity, can strengthen the high-frequency coupling between primary and secondary, change frequency breakover point with, obtain the effect of good inhibition EMI electromagnetic interference.But, along with the requirement of user to product miniaturization, for LED light fixture provides the volume of power supply of electric energy also more and more less, when Power Management Design becomes elongated and highly has in limited time, this Y electric capacity be placed to a crucial structural factor, certainly can be the horizontal placement of this Y electric capacity, but this will consume very large-area circuit board, be unfavorable for fully dwindling the volume of power source integral.And in whole power supply, conventionally the volume of transformer is one of the decisive factor that is the volume of whole power supply, the standard components and parts such as transformer and resistance, inductance are in a ratio of non-standard components and parts simultaneously, and it can design according to designer's requirement.

Utility model content

In view of this, be necessary to provide a kind of transformer of exempting from Y electric capacity that Y electric capacity and transformer can be united two into one, to meet the demand.

The transformer of exempting from Y electric capacity comprises a skeleton, winding armature winding on this skeleton, and winding secondary winding on this skeleton, a magnetic core being plugged in described skeleton, and at least one is packaged in the capacitance component in described magnetic core outside.Described capacitance component comprises at least one layer insulating, and two-layer first, second metal level that is arranged on described insulating barrier both sides.The positive pole of described the first metal layer and armature winding is electrically connected.The negative pole of described the second metal level and secondary winding or ground are electrically connected.

Compared with prior art, the capacitance component that the utility model utilization is prepared by described insulating barrier and first, second metal level is coated on the outside of magnetic core, this capacitance component again with skeleton on different metal stitch be electrically connected, thereby can be so that whole power supply be exempted the object of using Y electric capacity, and then can avoid, on the circuit board of power supply, Y electric capacity is set and the usage space that takies circuit board, reach the requirement of the whole volume that reduces power supply.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, embodiment of the present utility model is described, wherein:

The decomposition texture schematic diagram of the transformer of a kind of Y of exempting from electric capacity that Fig. 1 provides for the utility model.

Fig. 2 is the sectional structure schematic diagram of the transformer of exempting from Y electric capacity of Fig. 1.

Fig. 3 is the decomposition texture schematic diagram of capacitance component of the transformer of exempting from Y electric capacity of Fig. 1.

Embodiment

Based on accompanying drawing, specific embodiment of the utility model is further elaborated below.Should be appreciated that specific embodiment described herein is only as embodiment, and be not used in restriction protection range of the present utility model.

Refer to Fig. 1 to Fig. 2, it is a kind of structural representation of exempting from the transformer 100 of Y electric capacity provided by the utility model.The transformer 100 of the described Y of exempting from electric capacity comprises a skeleton 10, winding armature winding 11 on this skeleton 10, winding 12, one of secondary winding on this skeleton 10 are plugged in the magnetic core 13 in described skeleton 10, and at least one is packaged in the capacitance component 14 in described magnetic core outside.

Described skeleton 10 is used to the copper cash in described primary and

secondary winding

11,12 that the space of winding is provided, and for fixing described magnetic core 13, and conventionally by insulating material injection mo(u)lding.Therefore, described skeleton 10 comprises 103, one primary sides 104 of 102, one, 101, one magnetic core holes of at least one winding slot secondary end, and a plurality of metal stitch 105 that is arranged on described secondary end 103 and primary side 104.The structure of described winding slot 101 and quantity determines by the characteristics of transformer 100 itself, and in this enforcement embodiment, described winding slot 101 has one, and described primary and

secondary winding

11,12 is all arranged in this winding slot 101.Described magnetic core hole 102 is for plugging described magnetic core 13 so that described magnetic core 13 forms magnetic pole loop in magnetic core hole 102.Described secondary end 103 is separately positioned on the length direction of described skeleton 10 with primary side 104, for described metal stitch 105 being set to draw secondary winding 12 and armature winding 11.Described secondary end 103 can be different from the beeline in primary side 104 distance described magnetic core holes 12, to realize different creepage distances, because it does not belong to the utility model emphasis, do not repeat them here.In the present embodiment, described secondary end 103 is greater than described primary side 104 apart from the minimum range in magnetic core hole 102 apart from the minimum range in magnetic core hole 102.Described a plurality of metal stitch 105 is separately fixed at described secondary end 103 and primary side 104.Conventionally the metal stitch 105 being arranged on described secondary end 103 equates with the quantity that is arranged on the metal stitch 105 on described secondary end 104.Certainly, as required also can be different.In the present embodiment, described primary side 104 is respectively arranged with 4 metal stitch 105 with secondary end 103.

Described armature winding 11 is on the winding slot 101 that uses metal wire to be wrapped in described skeleton 10 and is made with secondary winding 12, its number of turn number according to the performance of transformer 100, determine.It should be noted that because described primary and

secondary winding

11,12 all winding in described winding slot 101, in order to insulate, between this primary and

secondary winding

11,12, be provided with insulating barrier, as drawn adhesive tape coated this primary and

secondary winding

11,12 respectively with agate.In Fig. 1,, for signal, be only two entity annular rings that are set on winding slot 101.

The magnetic material of described magnetic core 13 is comprised of ferromagnetic substance or ferrimagnetism material, and its part is plugged in the magnetic core hole 102 of described skeleton 10, for increasing inductance value.Under the flux interaction of described magnetic core 13, electric energy is changed between armature winding 11 and secondary winding 12, thereby reaches the object of voltage transformation.

See also Fig. 3, described capacitance component 14 comprises at least one layer insulating 141, and two-layer first, second metal level 142,143 that is arranged on described insulating barrier 141 both sides.Described insulating barrier 141 can be for agate draws adhesive tape, so that be beneficial to the coated winding of this capacitance component 14 in the outside of described magnetic core 13.Described insulating barrier 141 at least needs one deck with first, second metal level 142,143 described in interval.In the present embodiment, described insulating barrier 142 has two-layer, and one deck is for first, second metal level 142,143 described in interval, and another layer is coated on the outermost of described capacitance component 14, plays the effect of protection.Described first, second metal level 142,143 can be Copper Foil band, and is sticked in the central authorities of described insulating barrier, and the edge of this first, second metal level 142,143 is equal to the distance at the edge of insulating barrier 141.In order to make full use of described first, second metal level 142,143, described first, second metal level 142,143 section gaps arrange, so that described first, second metal level 142,143 has minimum area and has compared with high capacitance.When described transformer 100 is strip structure, described insulating barrier 141 is along the Width parcel of magnetic core 13, and the width of this insulating barrier 141 is identical with the length of magnetic core 13.Described the first metal layer 142 is electrically connected with the positive pole of armature winding 11, the negative pole of described the second metal level 143 and secondary winding 12 or be electrically connected to, thereby form an electric capacity between described first, second metal level 142,143, this electric capacity can be used as the Y electric capacity in power supply, thereby reaches the object of exempting from Y electric capacity.What can expect is, the capacitance size of described capacitance component 14 is set by the overlapping area of described first, second metal level 142,143, in other words, the size of the capacitance of described capacitance component 14 can be set by setting the overlapping area of described first, second metal level 142,143.Therefore the overlapping area of described first, second metal level 142,143 can be set according to the size of the capacitance of the Y electric capacity of actual use in circuit.Can expect, described capacitance component 14 also comprises that two for connecting respectively the wire (not shown) of described first, second metal level 142,143 and metal stitch 105, and it is those skilled in the art's technology known, does not repeat them here.

Compared with prior art, the utility model utilization is coated on the outside of magnetic core 14 by the capacitance component 14 of described insulating barrier 141 and 142,143 preparations of first, second metal level, this capacitance component 14 again with skeleton 10 on different metal stitch 105 be electrically connected, thereby can be so that whole power supply be exempted the object of using Y electric capacity, and then can avoid, on the circuit board of power supply, Y electric capacity is set and the usage space that takies circuit board, reach the requirement of the whole volume that reduces power supply.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all interior done any modifications in spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.

Claims

1. a transformer of exempting from Y electric capacity, it comprises a skeleton, winding armature winding on this skeleton, and winding secondary winding on this skeleton, it is characterized in that: this transformer of exempting from Y electric capacity also comprises a magnetic core being plugged in described skeleton, and at least one is packaged in the capacitance component in described magnetic core outside, described capacitance component comprises at least one layer insulating, and two-layer first of the described insulating barrier both sides that are arranged on, the second metal level, the positive pole of described the first metal layer and armature winding is electrically connected, the negative pole of described the second metal level and secondary winding or ground are electrically connected.

2. transformer of exempting from Y electric capacity as claimed in claim 1, is characterized in that: described insulating barrier is that agate draws adhesive tape.

3. transformer of exempting from Y electric capacity as claimed in claim 1, is characterized in that: described first, second metal level is band glue Copper Foil band.

4. transformer of exempting from Y electric capacity as claimed in claim 1, is characterized in that: described capacitance component comprises dielectric layers, and in this dielectric layers, one deck is coated on the outermost of described capacitance component.

5. transformer of exempting from Y electric capacity as claimed in claim 1, is characterized in that: described first, second metal level is sticked in the central authorities of described insulating barrier, and this first, second metal level is equal to the distance at the edge of insulating barrier.

6. transformer of exempting from Y electric capacity as claimed in claim 1, is characterized in that: described first, second metal level section gap arranges.

7. transformer of exempting from Y electric capacity as claimed in claim 1, is characterized in that: described insulating barrier is along the Width parcel of magnetic core, and the width of this insulating barrier is identical with the length of magnetic core.