CN202796397U

CN202796397U - Printed circuit board (PCB) planar transformer

Info

Publication number: CN202796397U
Application number: CN 201220219419
Authority: CN
Inventors: 张子军; 牙华政; 涂代军
Original assignee: Dongguan Mentech Optical and Magnetic Co Ltd
Current assignee: Dongguan Mentech Optical and Magnetic Co Ltd
Priority date: 2012-05-15
Filing date: 2012-05-15
Publication date: 2013-03-13
Anticipated expiration: 2022-05-15

Abstract

The utility model discloses a printed circuit board (PCB) planar transformer which comprises a first magnet core, a second magnet core, a PCB board, a film-coated copper sheet and a PIN. A central hole and two rows of copper-coated small holes are arranged on the PCB board, a central hole and two copper-coated small holes are arranged on the film-coated copper sheet, insulated coils are etched on the PCB board, the PCB board and the film-coated copper sheet are arranged at the protrusion positions of the magnetic cores in a stagger, lamination and penetrating mode, the PIN is inserted on an insertion hole to fix placing positions of the PCB board and the film-coated copper sheet, a winding coil can be turned on through the PIN, the winding coil is of a lamination structure due to the stagger and lamination mode, an original winding coil of the transformer can be coupled tightly to reduce leakage inductance and eddy-current loss. The PCB planar transformer is mainly used for direct-current switch power supplies, can be widely applied to mobile communication and switch power supplies of digital devices and can be further applied to signal transmission, electric isolation and the like between integrated service digital network (ISDN) networks.

Description

A kind of PCB flat surface transformer

Technical field

The utility model relates to field transformer, relates in particular to a kind of PCB flat surface transformer.

Background technology

Current, electronic equipment is constantly towards more small size, more high power density and more high efficiency development.Transformer is as one of key element in the electronic equipment, its volume becomes less, it is lighter that weight becomes, the lifting of performance is the thing that this technical field personnel lay siege to always, existing transformer, mainly utilize skeleton to support enamelled wire and magnetic core, its manufacture method is that enamelled wire is wound on above the skeleton, magnetic core with the air gap of milled inserts in the skeleton again, get final product with gummed paper or glue are fixing, in actual applications, existing transformer loss is large, and efficient is low, it is large to take up room, can not be applied on the electronic equipment well, and the batch production difficulty, manufacturing cost is high.

The utility model content

The utility model provides a kind of PCB flat surface transformer for shortcoming of the prior art, and this volume of transformer is little, lightweight, high efficiency, and makes simply, is fit to the plane and pastes the part assembling.

To achieve these goals, the technical solution adopted in the utility model is:

A kind of PCB flat surface transformer, it comprises the first magnetic core, the second magnetic core, pcb board, the membrane copper sheet, the PIN pin, have a centre bore at pcb board, side at pcb board has the attached copper aperture of two rows, have a centre bore at the membrane copper sheet, side at the membrane copper sheet has two attached copper apertures, the first magnetic core and the second magnetic core are " E " font, the second projection of the second magnetic core is cylindric, etching the first winding and second winding of transformer on the pcb board, and membrane copper coin and pcb board are set on the second projection of the second magnetic core in the mode of intersecting.The L-shaped shape of PIN pin can be inserted on the attached copper aperture and the attached copper aperture on the pcb board dual-side of membrane copper sheet side.

The beneficial effects of the utility model are: the PCB flat surface transformer that the utility model provides, it includes it and comprises the first magnetic core, the second magnetic core, pcb board, the membrane copper sheet, the PIN pin, have a centre bore at pcb board, side at pcb board has the attached copper aperture of two rows, have a centre bore at the membrane copper sheet, side at the membrane copper sheet has two attached copper apertures, membrane copper coin and pcb board are set on the second projection of described the second magnetic core in the mode of intersecting, and the PIN pin interts on the attached copper aperture of the attached copper aperture of telling pcb board both sides and described membrane copper sheet side.The required design element of described PCB flat surface transformer is few, thereby its volume only has 20% of traditional transformer, take up room thereby saved, this is so that described PCB flat surface transformer can be applied to the design of electronic circuits aspect well, in addition, the mounting means of described PCB flat surface transformer, design concept make it can be fit to well the plane and paste the part assembling, therefore this novel can be mass, and minimizing manufacturing cost; In addition, because film copper coin and pcb board are set on the second projection of the second magnetic core in the mode of intersecting, this is so that the winding coil of etching submission stack structure on the pcb board, can make so the former attached winding of transformer realize close-coupled, thereby greatly reduce leakage inductance and winding eddy current loss, so that the efficient of PCB flat surface transformer is up to 98%～99%, compare with traditional transformer, the utility model has more industrial value and the market competitiveness, and in addition, the area of dissipation of described PCB flat surface transformer is large, thereby available very little radiator, traditional transformer then needs to use relatively large fin, and obviously, the utility model meets environmental requirement.

Description of drawings

Fig. 1 is exploded view of the present utility model;

Fig. 2 is perspective view of the present utility model;

Fig. 3 is side structure schematic diagram of the present utility model;

Embodiment

In order to be that the technical solution of the utility model and beneficial effect can more clearly show, below in conjunction with drawings and Examples, the utility model is further elaborated.

With reference to Fig. 1,2, the disclosed a kind of PCB flat surface transformer of the utility model, it comprises the first FERRITE CORE 1, the second FERRITE CORE 5, pcb board 3, membrane copper sheet 2, PIN pin 4, have a centre bore 31 at pcb board 3, side at pcb board 3 has the attached copper aperture 32 of two rows, have a centre bore 21 at membrane copper sheet 2, side at the membrane copper sheet has two attached copper apertures 22, the second magnetic core 5 is " E " font, the second projection 51 of the second magnetic core 5 is cylindric, the second projection 51 of the second magnetic core 5 is complementary with the diameter of the centre bore 31 of the centre bore 21 of membrane copper sheet 2 and pcb board 3, PIN pin 4 is L-shaped, can be inserted on the attached copper aperture 22 of the attached copper aperture 32 of described pcb board 3 both sides and described membrane copper sheet 2 sides.

In the disclosed a kind of PCB flat surface transformer of the utility model, be etched with the winding coil of insulation on the pcb board 3, because the diameter of the centre bore 31 of the size of the second projection 51 of the second magnetic core 5 and the centre bore 21 of membrane copper sheet 2 and pcb board 3 is complementary, therefore pcb board 3 and described membrane copper sheet 2 can be set in the mode of intersecting the second protruding 51 places of the second magnetic core 5, by above-mentioned design, so that the winding coil of etching submission stack structure on the pcb board 3, be transposition structure between lock, can make so the former attached winding of transformer realize close-coupled, thereby greatly reduce leakage inductance and winding eddy current loss, so that the efficient of PCB flat surface transformer is up to 98%～99%, compare with traditional transformer, the utility model has more industrial value and the market competitiveness, in addition, the area of dissipation of described PCB flat surface transformer is large, thus available very little radiator, and traditional transformer then needs to use relatively large fin, obviously, the utility model meets environmental requirement.

In the utility model, because pcb board 3 and membrane copper sheet 2 are set in the second protruding 51 places of the second magnetic core 5 in the mode of intersecting, intersecting mode described here can be understood like this, must there be a membrane copper sheet 2 in the middle of adjacent two described pcb boards 3, membrane copper sheet 2 is mainly used in isolating adjacent two pcb boards 3, the winding coil of avoiding being etched on the described pcb board 3 causes short circuit, simultaneously two attached copper apertures 22 on the membrane copper sheet 2 and the attached copper aperture 32 on the pcb board dual-side play the effect that engages the winding coil of etching on the adjacent described pcb board 3, i.e. conducting PCB coil with PIN pin 4.

The quantity of pcb board 3 will determine the turn ratio of described PCB flat surface transformer; determine that namely described PCB flat surface transformer boosts or the reference index of step-down; therefore can maybe need the voltage swing of exporting according to the situation of electrical network, civil power for the selection of pcb board 3 quantity and decide; and the technology contents of this part is the known known technology of the art person skilled, and the quantity of described pcb board 3 is selected all to belong within the protection range of the present utility model.

With reference to Fig. 3, the diameter of the attached copper aperture 32 of PIN pin 4 and pcb board 3 both sides and the attached copper aperture 22 of membrane copper sheet is complementary, therefore PIN cushion can be contained in the jack that the attached copper aperture 22 of the attached copper aperture 32 of pcb board 3 both sides and membrane copper sheet forms, can so that realization is electrically connected between pcb board 3 and the membrane copper sheet 2 or between the adjacent pcb board 3, namely form the former attached coiling group of described pcb board transformer by such mode.

The bottom of PIN pin 4 and the second magnetic core 5 are isolated, therefore there are not electrical connection in PIN pin 4 and the second magnetic core 5, in addition, owing to adopt attached copper jack, therefore made things convenient for the welding between multi-layer PCB board 3 and the membrane copper sheet 2, can adopt Through-hole reflow to fetch and finish, such welding method so that production efficiency of the present utility model be greatly improved, and consistency is good, effectively guarantees multi-layer PCB board 3 and the q﹠r of membrane copper sheet 2 when welding.

The bottom of PIN pin 4 is connected on the application circuit as the interface of winding coil, the user can be as the case may be or user demand set up the winding coil number of turn on their own, with the interface of setting former attached coiling group, person skilled is not difficult to expect other transformer parameter standard and corresponding embodiment, and do not enumerated one by one here.

The above only is preferred embodiment of the present utility model, not in order to limiting the utility model, all any modifications of doing within principle of the present utility model, is equal to and replaces and improvement etc., all should be included within the protection range of the present utility model.

Claims

1. PCB flat surface transformer, it comprises the first magnetic core (1), the second magnetic core (5), pcb board (3), it is characterized in that: also comprise membrane copper sheet (2), PIN pin (4), be provided with a centre bore (31) at described pcb board (3), side at described pcb board (3) has two row's attached copper apertures (32), have a centre bore (21) at described membrane copper sheet (2), side at described membrane copper sheet has two attached copper apertures (22), described membrane copper coin (2) is set on second projection (51) of described the second magnetic core (5) with the mode of described pcb board (3) with intersecting, and described PIN pin (4) interts on the attached copper aperture (22) of the attached copper aperture (32) of described pcb board (3) both sides and described membrane copper sheet (2) side.

2. PCB flat surface transformer according to claim 1 is characterized in that, described the second magnetic core (5) cross section is " E " font, and wherein, described the second projection (51) that is positioned at the second magnetic core (5) middle part is cylinder.

3. PCB flat surface transformer according to claim 1, it is characterized in that the diameter of the centre bore (31) of the size of second projection (51) of described the second magnetic core (5) and the centre bore (21) of described membrane copper sheet (2) and described pcb board (3) is complementary.

4. PCB flat surface transformer according to claim 1 is characterized in that, the upper etching of described pcb board (3) the first winding and second winding of transformer.

5. PCB flat surface transformer according to claim 1 is characterized in that, is etched with the winding coil of mutually insulated on the described pcb board.

6. PCB flat surface transformer according to claim 1, it is characterized in that, the L-shaped shape of described PIN pin (4), the diameter of the attached copper aperture (32) of its sectional dimension and described pcb board (3) and the attached copper aperture (22) of described membrane copper sheet (2) is complementary.