CN214476881U

CN214476881U - Switching power supply module structure

Info

Publication number: CN214476881U
Application number: CN202120426640.4U
Authority: CN
Inventors: 姚超源; 陈宁; 梁文杰
Original assignee: Mornsun Guangzhou Science and Technology Ltd
Current assignee: Mornsun Guangzhou Science and Technology Ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-10-22
Anticipated expiration: 2031-02-26

Abstract

The utility model discloses a switching power supply modular structure, including main power circuit board and a planar transformer. The pin terminal of the switch power supply module is a gold finger with an opening, and is integrated with the main power circuit board; the planar transformer is formed by at least two PCB boards which are insulated and laminated at intervals, and compared with a single multilayer PCB board, the planar transformer has the advantages that the material cost is lower, and the product cost is reduced; compared with a skeleton transformer, the volume is thinner, and the thickness of a product is reduced; the safety distance of a plurality of safety certification standards is met through the solid insulation design, so that the ultrathin volume of the product is realized, a transformer does not need to be wound, and the production cost is saved.

Description

Switching power supply module structure

Technical Field

The patent of the utility model relates to a AC/DC switching power supply field, in particular to little volume AC/DC switching power supply modular structure.

Background

The power supply module is a power supply device which can be directly attached to a printed circuit board, can supply power for an application-specific integrated circuit, a processor, a memory and a digital or analog load, and is widely applied to occasions with strict requirements on volume, such as industrial control, electric instruments and meters, smart homes and the like.

The switch power supply module can be divided into two categories of AC/DC and DC/DC, the DC/DC converter is modularized, the design technology and the production process are mature and standardized at home and abroad, but the modularization of the AC/DC converter causes the AC/DC converter to encounter more complex technical and process manufacturing problems in the modularization process due to the characteristics of the AC/DC converter. At present, the AC/DC power supply module on the market is difficult to consider both volume performance and price, and is difficult to realize full-automatic production in process.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an ultra-thin type miniwatt AC/DC power module when reducing the power module volume, increase power integrated density, the optimization performance improves technology, reduce cost.

The purpose of the utility model is realized through the following technical measures:

a switching power supply module structure comprises a main power circuit board and a planar transformer, wherein the planar transformer is embedded into the main power circuit board and comprises a magnetic core and a board part, the board part is formed by laminating more than two PCB boards, a winding wire is arranged on each PCB board, the PCB boards are mutually insulated and separated, the main power circuit board and the planar transformer share one PCB board, and the magnetic cores are distributed on the upper surface and the lower surface of the board part.

Preferably, the magnetic core comprises a magnetic sheet and a magnetic shaft, the magnetic sheet is respectively arranged on the upper surface and the lower surface of the plate component, and the plate component is sleeved on the magnetic shaft in a penetrating way.

Preferably, the winding wires arranged on the PCB shared by the main power circuit board and the planar transformer are primary winding wires and secondary winding wires, the secondary winding wires are embedded in the PCB, and the PCB and the primary winding wires are electrically isolated; and the winding wires arranged on other PCB boards are primary winding wires and are connected through holes.

Preferably, the other PCB board is electrically connected with the main power circuit board through a sidewall copper deposition process.

Preferably, the external pin of the main power circuit board is a gold finger, and is integrated with the PCB board.

Preferably, the gold finger is provided with a through hole for connecting the copper foil of the gold finger.

Preferably, the number of the golden fingers is 6, the golden fingers are positioned at one end of the main power circuit board and are sequentially used for connecting an input power supply L line, an input power supply N line, an input filter capacitor and + V_(cap)Input filter capacitor-V_(cap)Output terminal-V_oAnd output terminal + V_o。

Preferably for connecting the output terminal-V_oAnd output terminal + V_oThe anode and the cathode of the golden finger are provided with pins, and the electrical polarity is respectively arranged at two sides of the golden finger.

Preferably, the main power circuit board is manufactured by a solid insulation technology, and the original secondary side mounting distance is larger than 1.0 mm.

A method for assembling a switching power supply module structure, wherein the switching power supply module structure comprises a main power circuit board and a planar transformer, the planar transformer is embedded into the main power circuit board, the planar transformer comprises a magnetic core and a board part, the board part consists of more than two PCB boards, the main power circuit board and the planar transformer share one PCB, the magnetic core comprises a magnetic sheet and a magnetic shaft, and the method comprises the following steps:

embedding primary winding wires in the PCBs and connecting the primary winding wires with the PCBs through holes, embedding secondary winding wires in the PCBs shared by the main power circuit board and the planar transformer, and electrically isolating the primary winding wires by utilizing the PCBs;

a stacking step of stacking each PCB as a board component;

and assembling, namely sleeving the plate component on the magnetic shaft in a penetrating manner, so that the magnetic sheets are positioned on the upper surface and the lower surface of the plate component.

Because above-mentioned technical scheme's application, the utility model has the advantages of alternating current-direct current dual-purpose, input voltage range are wide, high efficiency, high reliability, low-power consumption, safety isolation, and can arrange peripheral circuit according to the demand, nimble application satisfies the market demand, and specific beneficial effect is as follows:

1. the pins adopt a golden finger scheme, are integrated with the main power circuit board, do not need to add a bonding pad of a terminal, greatly reduce the module volume, and the output pins adopt a design of common positive and negative pins, increase the mechanical strength of the main power circuit board, do not need to weld the terminal, simplify the process and reduce the cost;

2. the design of the through holes is added on the golden fingers, and the copper foils of the golden fingers are connected, so that the mechanical strength of the golden fingers is increased, the golden fingers are not easy to break when in shock, and the welding strength of the golden fingers and a PCB pad of a client system is enhanced;

3. the solid insulation design is adopted, the safety distance is only more than 1.0mm, and the size of the module is greatly compressed;

4. the magnetic core is assembled only after the plate parts are welded, wire winding is not needed, the transformer plate parts are formed by overlapping more than two PCB plates with fewer layers, compared with a single multilayer PCB plate, the material cost is lower, and the production cost of the whole product can be effectively reduced;

5. the wiring connection between the PCB layers except the main power circuit board only uses a through hole process, the safety regulation problem is not considered, and the side wall copper deposition design is adopted at the connection part of the PCB layers and the main power circuit board;

6. the second board part of the planar transformer consists of a single PCB with few layers, and comprises secondary power winding wiring, top and bottom layers do not have wiring, and the connection of the interlayer wiring and the main power circuit board adopts a side wall copper deposition design by using a hole burying process;

7. the utility model discloses implement the volume that makes power module and reduced 20%, satisfy authentication ann rule requirement, and manufacturing process simplifies, and material and manufacturing cost descend.

Drawings

Fig. 1 is a first three-dimensional structure diagram of a power supply product according to an embodiment of the present invention;

FIG. 2 is a wiring diagram of module application in an embodiment of the present invention;

FIG. 3 is a diagram of the embodiment of the present invention showing the transformer disassembled;

fig. 4-1 is a schematic top view of a main power circuit board according to an embodiment of the present invention;

fig. 4-2 is a schematic bottom view of a main power circuit board according to an embodiment of the present invention;

FIG. 5 is a second perspective view of the embodiment of the present invention;

Detailed Description

Fig. 1 is a perspective view of a power supply product according to an embodiment of the present invention, which is a switching power supply module structure, including a main power circuit board and a planar transformer, the planar transformer is embedded in the main power circuit board.

Fig. 3 is the embodiment of the utility model provides an in the transformer split map, planar transformer includes magnetic core and board part, and the board part is formed by the PCB board lamination of three less numbers of piles of layers, is equipped with the winding on the PCB board and walks the line, and each PCB board is isolated each other and is separated by, and the main power circuit board shares one of them PCB board with planar transformer, and the upper and lower surface distribution of board part has the magnetic core. The magnetic core comprises magnetic sheets and a magnetic shaft, the magnetic sheets are respectively positioned on the upper surface and the lower surface of the plate part, and the plate part is sleeved on the magnetic shaft in a penetrating way.

Fig. 4-1 is the embodiment of the utility model provides an in the embodiment of the top surface schematic diagram of main power circuit board, fig. 4-2 is the embodiment of the utility model provides an in the bottom surface schematic diagram of main power circuit board, the winding that establishes is walked on the shared PCB board of main power circuit board and planar transformer is walked line and is walked line for primary and secondary, secondary walks the line and buries in the PCB board, utilize PCB panel and primary to walk the line and do electrical isolation, main power circuit board intermediate level is rather than top bottom layer interval >0.5mm, utilize PCB thickness and former limit to do electrical isolation, the winding that establishes is walked the line and is walked the line for primary on other PCB boards, connect through the through-hole. And the other PCB is electrically connected with the main power circuit board through a side wall copper deposition process. The external pin of the main power circuit board is a golden finger and is integrated with the PCB. Through hole designs are added at the connection part a of the routing of the golden finger and the main power circuit board and at the tail end b of the golden finger (the design is an optimized open hole design, the open hole design shown in fig. 1, 3 and 5 is that only the tail end b of the golden finger is open), copper foils on the top and bottom surfaces of the golden finger are connected, wherein the golden finger 1 and the golden finger 2 are used for inputting a power supply, the golden finger 3 and the golden finger 4 are used for externally connecting a filter electrolytic capacitor, the golden finger 5 and the golden finger 6 are output pins for supplying power to a load, and as shown in fig. 2, the golden finger and the main power circuit board can be externally connected with an EMC circuit according to the application environment. The positive and negative electrodes of the output pin are pin-sharing, and the electrical polarity is respectively arranged at the two sides of the output pin.

Fig. 5 is a second drawing of the product structure of the embodiment of the utility model, the main power circuit board passes through the solid insulation technology, and the distance of the original assistant safety regulation is more than 1.0 mm.

The board part of the embodiment adopts the side wall copper deposition design, and is welded together with the patch device on the main power circuit board, and then the magnetic core is assembled without winding wires.

The embodiments of the present invention are not limited to the above, and according to the above-mentioned contents of the present invention, the common technical knowledge and the conventional means in the field are utilized, without departing from the basic technical idea of the present invention, the specific implementation circuit of the present invention can also make other modifications, replacements or changes in various forms, all falling within the scope of the present invention.

Claims

1. The utility model provides a switching power supply modular structure, includes main power circuit board and planar transformer, during planar transformer embedding main power circuit board, its characterized in that: the planar transformer comprises a magnetic core and a board component, wherein the board component is formed by stacking and combining more than two PCB boards, a winding is arranged on each PCB board, the PCB boards are insulated and separated from each other, the main power circuit board and the planar transformer share one PCB board, and the magnetic core is distributed on the upper surface and the lower surface of the board component.

2. The switching power supply module structure according to claim 1, wherein: the magnetic core comprises magnetic sheets and a magnetic shaft, the magnetic sheets are respectively positioned on the upper surface and the lower surface of the plate part, and the plate part is sleeved on the magnetic shaft in a penetrating manner.

3. The switching power supply module structure according to claim 1, wherein: winding wires arranged on a PCB shared by the main power circuit board and the planar transformer are primary winding wires and secondary winding wires, the secondary winding wires are embedded in the PCB, and the PCB and the primary winding wires are electrically isolated; and the winding wires arranged on other PCB boards are primary winding wires and are connected through holes.

4. A switching power supply module structure according to claim 3, characterized in that: and the other PCB is electrically connected with the main power circuit board through a side wall copper deposition process.

5. The switching power supply module structure according to claim 1, wherein: the external pin of the main power circuit board is a golden finger and is integrated with the PCB.

6. The switching power supply module structure according to claim 5, wherein: and the gold finger is provided with a through hole for connecting the copper foils of the gold finger.

7. The switching power supply module structure according to claim 5, wherein: the number of the golden fingers is 6, the golden fingers are positioned at one end of the main power circuit board and are sequentially used for connecting an input power supply L line, an input power supply N line, an input filter capacitor and + V_(cap)Input filter capacitor-V_(cap)Output terminal-V_oAnd output terminal + V_o。

8. The switching power supply module structure according to claim 7, wherein: said for connecting the output terminal-V_oAnd output terminal + V_oThe anode and the cathode of the golden finger are provided with pins, and the electrical polarity is respectively arranged at two sides of the golden finger.

9. The switching power supply module structure according to any one of claims 1 to 8, characterized in that: the main power circuit board is characterized in that the original and secondary side safety distance is larger than 1.0mm through a solid insulation technology.