CN213877786U

CN213877786U - Thin transformer of switching power supply

Info

Publication number: CN213877786U
Application number: CN202022806262.0U
Authority: CN
Inventors: 叶灼; 唐景新; 黄超; 贺孟
Original assignee: Changzhou Chuanglian Power Supply Co ltd
Current assignee: Changzhou Chuanglian Power Supply Co ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-08-03
Anticipated expiration: 2030-11-27

Abstract

The utility model provides a switching power supply's slim transformer, including primary, secondary and ferrite core, secondary includes first and second secondary, and the ferrite core includes magnetic core and lower magnetic core, and its structural feature is: the thin transformer also comprises a primary winding mounting plate, the primary winding is arranged on the primary winding mounting plate, the upper magnetic core and the lower magnetic core are arranged above and below a PCB (printed circuit board) of the switching power supply when being assembled, the upper magnetic core penetrates through the first secondary winding and the primary winding from top to bottom, and after the lower magnetic core penetrates through the second secondary winding from bottom to top, the lower end surface of the upper magnetic core and the upper end surface of the lower magnetic core are butted in a magnetic core inserting hole arranged on the PCB to form an integrated ferrite magnetic core; the second secondary winding is a winding printed in the PCB by copper. Compared with the prior art, the utility model, can effectively reduce mounting height, satisfy ultra-thin type switching power supply's use needs to can reduce manufacturing cost.

Description

Thin transformer of switching power supply

Technical Field

The utility model relates to a switching power supply's transformer, concretely relates to switching power supply's slim transformer.

Background

The transformer adopted in the current low-voltage output switching power supply circuit generally adopts a structure formed by assembling a primary winding, two secondary windings with middle taps and a ferrite core, generally, the transformer is the highest-height element on a switching power supply PCB circuit board, and in order to meet the requirement of the thin structure design of the switching power supply, the transformer of the current switching power supply generally adopts a thin transformer as shown in figure 1, and is welded and fixed on the upper end surface of the circuit board of the switching power supply in a plug-in mode. Referring to fig. 2, the currently-used thin transformer mainly comprises a bobbin 1, a primary winding 2 wound on the bobbin 1, a secondary winding 3 formed by 2 surface tin-plated copper sheets respectively arranged at the upper and lower ends of the bobbin 1, and a ferrite core 4, wherein the ferrite core 4 is formed by an upper magnetic core 41 and a lower magnetic core 42 respectively arranged at the upper and lower ends of the 2 secondary windings, when the transformer is assembled, the 2 secondary windings 3 are sleeved on the bobbin 1, and the upper magnetic core 41 and the lower magnetic core 42 penetrate through the corresponding secondary windings 3 and the primary windings 2 to be combined together. The problems of the existing thin transformer are as follows: firstly, because of the limit of the integral structure and the installation mode of the integral structure on the PCB, the integral height of the existing thin transformer is still relatively high, and the use requirement of the ultrathin switch power supply is difficult to meet; and secondly, the 2 secondary windings 3 are all made of copper sheets with tin-plated surfaces, and the shape of each copper sheet needs to be manufactured by die sinking, so that the cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: to solve the problems in the prior art, a thin transformer of a switching power supply capable of reducing the overall height and cost is provided.

The technical scheme of the utility model is that: the utility model discloses a switching power supply's slim transformer, including primary, secondary and ferrite core, above-mentioned secondary includes first secondary and second secondary, and above-mentioned ferrite core includes magnetic core and lower magnetic core, and its structural feature is: the thin transformer further comprises a primary winding mounting plate, the primary winding is arranged on the primary winding mounting plate, the upper magnetic core and the lower magnetic core are arranged above and below a PCB (printed circuit board) of the switching power supply during assembly, the upper magnetic core penetrates through the first secondary winding and the primary winding from top to bottom, after the lower magnetic core penetrates through the second secondary winding from bottom to top, the lower end face of the upper magnetic core and the upper end face of the lower magnetic core are butted in a magnetic core inserting hole arranged in the PCB to form an integrated ferrite magnetic core.

The further scheme is as follows: the second secondary winding is a winding printed in the PCB by adopting copper.

The utility model discloses has positive effect: (1) the utility model discloses a switching power supply's slim transformer, it is through overall structure's design, especially locate switching power supply's PCB circuit board with the last magnetic core of ferrite core and lower magnetic core branch on the up-down terminal surface, print the second secondary winding in the secondary winding in PCB circuit board simultaneously, and left out the great skeleton of size that the installation relied on among the prior art, thereby make its top mounting height of switching power supply's PCB circuit board obviously reduce than prior art, can effectively satisfy ultra-thin type switching power supply's use needs. (2) The utility model discloses a switching power supply's slim transformer, it adopts the copper to print in PCB circuit board through the second secondary winding with in the secondary winding when switching power supply's PCB circuit board preparation, for the second secondary winding that the surface tinned copper sheet that prior art's needs die sinking utensil was made constitutes, the cost is for reducing greatly.

Drawings

Fig. 1 is a schematic diagram of an overall structure of a thin transformer of a switching power supply in the prior art;

FIG. 2 is a schematic diagram of the exploded structure of FIG. 1;

FIG. 3 is a schematic structural diagram of the present invention, which also shows the assembly relationship with the circuit board;

FIG. 4 is a schematic illustration of the exploded structure of FIG. 3;

the reference numbers in the above figures are as follows:

a framework 1, a primary winding 2, a secondary winding 3, a first secondary winding 31, a second secondary winding 32, a ferrite core 4, an upper core 41 and a lower core 42; primary winding mounting plate 5, PCB circuit board 6, core patch hole 61.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

(example 1)

Referring to fig. 3 and 4, the thin transformer of the switching power supply of the present embodiment is mainly composed of a primary winding 2, a secondary winding 3, a ferrite core 4, and a primary winding mounting plate 5.

The primary winding mounting plate 5 is a plate body made of insulating materials; a core mounting hole (not shown) is provided in the center of the primary winding mounting plate 5. The primary winding 2 is wound on the primary winding mounting plate 5 around the core mounting hole of the primary winding mounting plate 5.

The secondary winding 3 includes a first secondary winding 31 and a second secondary winding 32. The first secondary winding 31 is made of a copper sheet with tin plated surface, which is basically the same as the prior art, and the difference is the structure of the pin. The second secondary winding 32 is completely different from the prior art, and when the PCB 6 is manufactured, the second secondary winding 32 is printed in the PCB 6 by using copper. The cost of the second secondary winding 32 of the present embodiment is greatly reduced relative to the second secondary winding formed of a copper sheet with tin plated surface of the prior art.

The ferrite core 4 includes an upper core 41 and a lower core 42. Unlike the prior art in which the entire transformer is mounted on the upper end surface of the PCB 6, the upper core 41 of the ferrite core 4 of the thin transformer of the present embodiment is disposed on the upper end surface of the PCB 6, the lower core 42 of the ferrite core 4 is disposed on the lower end surface of the PCB 6 by using the mounting height of the PCB 6 of the switching power supply in the housing, the upper core 41 sequentially passes through the first secondary winding 31 of the secondary winding 3, the primary winding 2, and the second secondary winding 32 of the secondary winding 3 from top to bottom, and is abutted with the lower core 42 in the core insertion hole 61 provided in the PCB 6, and then the corresponding insertion pins are soldered to complete the mounting of the thin transformer of the switching power supply of the present embodiment on the PCB 6. It can be seen that, because the framework 1 depending on assembly in the prior art is omitted, the secondary winding 3 formed by 1 copper sheet with tin-plated surface is omitted, and the lower magnetic core 42 is arranged below the PCB 6 instead of above the PCB 6, the height of the thin transformer of the present embodiment above the PCB 6 is obviously reduced compared with the prior art, thereby effectively meeting the use requirement of the ultra-thin type switching power supply.

The above embodiments are illustrative of the specific embodiments of the present invention, but not limiting to the present invention, and those skilled in the relevant art can also make various changes and modifications to obtain the equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should fall under the protection scope of the present invention.

Claims

1. A thin transformer for a switching power supply, comprising a primary winding, a secondary winding and a ferrite core, the secondary winding comprising a first secondary winding and a second secondary winding, the ferrite core comprising an upper core and a lower core, characterized in that: the thin transformer further comprises a primary winding mounting plate, the primary winding is arranged on the primary winding mounting plate, the upper portion and the lower portion of a PCB circuit board of the switching power supply are arranged during assembly of the upper magnetic core and the lower magnetic core, the upper magnetic core penetrates through the first secondary winding and the primary winding from top to bottom, the lower magnetic core penetrates through the second secondary winding from bottom to top, and the lower end face of the upper magnetic core and the upper end face of the lower magnetic core are butted in a magnetic core inserting hole formed in the PCB circuit board to form an integrated ferrite magnetic core.

2. The thin transformer for a switching power supply according to claim 1, characterized in that: the second secondary winding is a winding printed in the PCB by adopting copper.