RU74516U1 - LOW PROFILE FLAT TRANSFORMER - Google Patents

Abstract

A low-profile flat transformer in one embodiment of the design comprises a rectangular frame including upper and lower recesses, a first hole through the upper part and the lower part, a transverse slot extending to the other side, and a flange on the other side, a sheet primary winding including the second hole through its upper part and lower part, while the primary winding is inserted into the slot so that its other side will protrude outward, and the second hole is aligned with the first hole, recessed rim-shaped secondary winding, two U-shaped insulators clamping the front and rear ends of the secondary winding, the first E-shaped core and the second sheet-shaped core connected to the first core by introducing a central protrusion of the first core through the first and second holes , with a frame, windings and insulators located between them.

Description

Technical field

The present invention relates to a small planar transformer having a lower profile than a conventional planar transformer.

State of the art

Flat transformers are well known in the art. Flat transformers have the advantages of compactness, high efficiency and optimal heat dissipation. US Pat. No. 5,010,314 discloses a certain type of low profile flat transformer.

Usually a small flat transformer is installed in a compact electronic product (for example, a laptop, MPZ player, etc.) to supply the required power to it. However, conventional types of planar transformer have the disadvantage of having a significant gap between the core and the windings for safety reasons regarding the magnetic effect (creep). Therefore, from the point of view of the inventor, typical planar transformers are still relatively voluminous.

It is clear that there is a desire to reduce the size of electrical and electronic equipment. Therefore, a further reduction in the size of the flat transformers is desirable.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a small planar transformer having a reduced profile, so that the insulation gap and creep distances required between the primary winding and the secondary winding can be increased to optimal.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is further explained in the description of the preferred embodiments with reference to the accompanying drawings, in which:

figure 1 depicts a General view of a flat transformer, in disassembled form, according to the invention.

figure 2 is a General view of a flat transformer, assembled, according to the invention;

figure 3 is a top view of a flat transformer according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

Figure 1-3 shows a flat transformer 100 made in accordance with the present invention.

A frame 10 is mounted between the first core 12 and the second core 14. The frame 10 comprises a hollow rectangular housing (not numbered) having an upper surface 101, a lower surface 102, two sides 103, a central rectangular hole 104 passing through the upper and lower surfaces 101 and 102, two recessed structures 105 on the upper and lower surfaces 101 and 102, respectively, and the transverse

a slot 106 having a blind end close to one side 103 and another end extending to the other side 103, while the slot 106 communicates with the hole 104.

The primary winding 16 is formed into a rectangular sheet. The primary winding 16 is made in the form of a printed circuit board. The primary winding 16 comprises a central rectangular hole 161 extending through its upper and lower surfaces, and a protrusion 162 on the other side. The hole 161 has a size corresponding to the hole 104. The protrusion 162 is made in the form of a series of electrically conductive contacts (that is, in the form of an end connector) and is intended for electrical connection with a mating socket of a socket (not shown).

The secondary winding 18 is made rectangular and consists of two spaced apart parallel sheets connected to each other on one side. The secondary winding 18 is made in the form of a copper winding or a printed circuit board. The secondary winding 18 has a central hole (not numbered) and an eye (not numbered) on one side. The eye is made in the form of a series of electrically conductive contacts (that is, in the form of an end connector), while it is intended for electrical connection with another socket of a socket (not shown).

On the other hand 103 of the frame 10, a flange 107 is formed. Both the first core 12 and the second core 14 are made in the form of a ferromagnetic core. The first core 12 has an E-shape. The second core 14 is a rectangular plate. Two insulators 19 are formed from a U-shaped insulating sheet.

Next will be described in detail the assembly according to the invention. First, the primary winding 16 is inserted into the slot 106 for mounting so that only the protrusion 162 protrudes outward. Then, on a sliding fit, the secondary winding 18 is mounted on the upper and lower recessed surfaces 105 by pressing on one side 103 of the frame 10, since the secondary winding 18 has a corresponding size. That is, the secondary winding 18 clamps the recessed structures 105. After that, push the insulators 19 on the front and rear ends of the secondary winding 18 until the bending parts of the insulators 19 engage with the front and rear ends of the secondary winding 18 and are stopped by them . Then, a second core 14 is mounted on the insulators 19. Finally, a central protrusion of the first core 12 is inserted through the openings 104 and 161 to secure the first core 12 to the second core 14 by means of magnetic force.

The invention has the following advantages. The distance between the primary winding 16 and the secondary winding 18 is significantly increased. Therefore, the physical size of the transformer 100 can be substantially reduced. The flange 107 functionally serves as an insulating element between the primary winding 16 and the secondary winding 18 and, therefore, the insulating gap between them can be increased. In addition, the flange 107 can increase the size of the insulating gap, respectively, between the primary winding 16 and the first core 12, and between the secondary winding 18 and the second core 14. Further, the flange 107 can

increase the distance, with respect to creep, between the primary winding 16 and the secondary winding 18, between the primary winding 16 and the first core 12, and between the secondary winding 18 and the second core 14, respectively. Finally, the operational safety of the transformer 100 is greatly enhanced.

It can be seen that the insulation between the first core 12 and the secondary winding 18, and the insulation between the second core 14 and the secondary winding 18 is carried out by installing an insulator 19. Alternatively, the insulator 19 can be eliminated if the insulation is formed directly on the secondary winding 18. Secondary winding 18 consists of a large number of separate layers, while the number of layers can largely depend on the requirements for output power, current and / or voltage. In addition, the insulating gap between the primary winding 16 and the secondary winding 18 can be further increased by increasing the peripheral walls or the depth of the buried structures 105.

Claims (8)

1. A flat transformer containing a rectangular frame containing two recessed structures on the upper part and on the lower part, respectively, the Central first hole through the upper part and the lower part, a transverse slot having a blind end close to one side and the other end facing the other side wherein the slot is in communication with the first hole, and a flange on the other side, a sheet-shaped primary winding, comprising a central second hole through the upper and lower surfaces for insertion into the slot, moreover, the other side of the primary winding protrudes outward, and the second hole is aligned with the first hole, a rectangular secondary winding intended for installation on recessed structures, two U-shaped insulating elements designed to clamp the front and rear ends of the secondary winding, the first core is E-shaped shaped, a second sheet-shaped core intended to be connected to the first core by introducing a central protrusion of the first core through the first and second holes, with a frame primary winding, secondary winding and insulating elements between them. 2. The flat transformer according to claim 1, characterized in that each of the first and second cores is made of ferromagnetic material. 3. The flat transformer according to claim 1, characterized in that the primary winding is a printed circuit board. 4. The flat transformer according to claim 1, characterized in that the secondary winding is either a copper winding or a printed circuit board. 5. A flat transformer comprising a rectangular frame containing two recessed structures on the upper part and on the lower part, respectively, a central first hole through the upper part and the lower part, a transverse slot having a blind end close to one side and the other end facing the other side wherein the slot is in communication with the first hole, and a flange on the other side, a sheet-shaped primary winding, comprising a central second hole through the upper and lower surfaces for insertion into the slot, moreover, the other side of the primary winding protrudes outward, and the second hole is aligned with the first hole, a rectangular secondary winding containing two insulating elements on the upper part and on the lower part, respectively, while the secondary winding is designed to be installed on recessed structures, the first core is E-shaped ; a second sheet-shaped core intended to be connected to the first core by introducing a central protrusion of the first core through the first and second openings, with a frame, a primary winding and a secondary winding between them. 6. The flat transformer according to claim 5, characterized in that each of the first and second cores is made of ferromagnetic material. 7. The flat transformer according to claim 5, characterized in that the primary winding is a printed circuit board. 8. The flat transformer according to claim 5, characterized in that the secondary winding is either a copper winding or a printed circuit board.