CN114974826A - Switching power supply module structure - Google Patents

Switching power supply module structure Download PDF

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Publication number
CN114974826A
CN114974826A CN202110218840.5A CN202110218840A CN114974826A CN 114974826 A CN114974826 A CN 114974826A CN 202110218840 A CN202110218840 A CN 202110218840A CN 114974826 A CN114974826 A CN 114974826A
Authority
CN
China
Prior art keywords
power supply
circuit board
pcb
main power
power circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202110218840.5A
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Chinese (zh)
Inventor
姚超源
陈宁
梁文杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mornsun Guangzhou Science and Technology Ltd
Original Assignee
Mornsun Guangzhou Science and Technology Ltd
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Filing date
Publication date
Application filed by Mornsun Guangzhou Science and Technology Ltd filed Critical Mornsun Guangzhou Science and Technology Ltd
Priority to CN202110218840.5A priority Critical patent/CN114974826A/en
Publication of CN114974826A publication Critical patent/CN114974826A/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H01F27/292—Surface mounted devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/041—Printed circuit coils
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • H01F2027/2809—Printed windings on stacked layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • H01F2027/2819—Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H01F2027/297—Terminals; Tapping arrangements for signal inductances with pin-like terminal to be inserted in hole of printed path

Abstract

The invention discloses a switching power supply module structure which comprises a 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 insulating, laminating and combining at least two PCB boards 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 invention relates to the field of AC/DC switching power supplies, in particular to a small-size AC/DC switching power supply module 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 modules on the market are difficult to consider both volume performance and price, and the full-automatic production is difficult to realize in process.
Disclosure of Invention
The invention mainly aims to provide an ultrathin low-power AC/DC power supply module, which can optimize the performance, improve the process and reduce the cost while reducing the volume of the power supply module and increasing the power integration density.
The purpose of the invention is realized by 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 + V (cap) Input filter capacitor-V (cap) Output terminal-V o And output terminal + V o 。
Preferably for connecting the output-V o And output terminal + V o The 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.
Due to the application of the technical scheme, the invention has the advantages of AC/DC dual-purpose, wide input voltage range, high efficiency, high reliability, low power consumption, safety isolation and the like, can be matched with peripheral circuits according to requirements, is flexibly applied, meets the market requirements, and has the following specific beneficial effects:
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 implementation of the invention reduces the volume of the power module by 20 percent, meets the requirements of certification safety regulations, simplifies the manufacturing process and reduces the material and manufacturing cost.
Drawings
FIG. 1 is a first perspective view of a power supply product according to an embodiment of the present invention;
FIG. 2 is a wiring diagram of a module application in an embodiment of the present invention;
FIG. 3 is an exploded view of a transformer according to an embodiment of the present invention;
FIG. 4-1 is a schematic top view of a main power circuit board in an embodiment of the invention;
FIG. 4-2 is a bottom view of a main power circuit board in an embodiment of the present invention;
fig. 5 is a second perspective view of a product according to an 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 embedded in the main power circuit board.
Fig. 3 is an exploded view of a transformer according to an embodiment of the present invention, in which the planar transformer includes a magnetic core and a board component, the board component is formed by stacking three PCB boards with a small number of layers, the PCB boards are provided with winding wires, the PCB boards are insulated and spaced 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 and lower surfaces of the board component. 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 a schematic top view of a main power circuit board in an embodiment of the present invention, fig. 4-2 is a schematic bottom view of the main power circuit board in the embodiment of the present invention, winding wires arranged on a PCB board shared by the main power circuit board and a planar transformer are primary winding wires and secondary winding wires, the secondary winding wires are embedded in the PCB board, the PCB board is used for electrical isolation from the primary winding wires, the distance between the middle layer of the main power circuit board and the top bottom layer thereof is greater than 0.5mm, and the thickness of the PCB board is used for electrical isolation from the primary side; and the winding wires arranged on other PCB boards are primary winding wires and are connected through holes. 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 wiring connection part a of the golden finger and the main power circuit board and at the tail end b of the golden finger (the design is a preferable open hole design, the open holes shown in figures 1, 3 and 5 are designed to open holes at the tail end b of the golden finger only), the 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 and supply power to a load, and as shown in figure 2, the power supply device can be externally connected with an EMC circuit according to an application environment. The positive and negative electrodes of the output pin are connected with the pins, and the electrical polarity is respectively arranged at the two sides of the output pin.
Fig. 5 is a diagram of a product structure of the embodiment of the invention, the main power circuit board adopts a solid insulation technology, and the original secondary side safety distance 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 thereto, and according to the above-mentioned contents of the present invention, the specific implementation circuit of the present invention can be modified, replaced or changed in various other forms without departing from the basic technical idea of the present invention.

Claims (10)

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 winding wires arranged on other PCBs are primary winding wires and are connected through holes.
4. The switching power supply module structure according to claim 3, wherein: 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 o And output terminal + V o 。
8. The switching power supply module structure according to claim 7, wherein: said for connecting the output terminal-V o And output terminal + V o The 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.
10. The utility model provides a switching power supply module structure assembly method, switching power supply module structure includes main power circuit board and planar transformer, and planar transformer imbeds in the main power circuit board, and planar transformer includes magnetic core and board spare, and the board spare comprises more than two PCB boards, and one of them PCB board is shared with planar transformer to the main power circuit board, and the magnetic core includes magnetic sheet and magnetic axis, its characterized in that: comprises the following steps of (a) carrying out,
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.
CN202110218840.5A 2021-02-26 2021-02-26 Switching power supply module structure Withdrawn CN114974826A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110218840.5A CN114974826A (en) 2021-02-26 2021-02-26 Switching power supply module structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110218840.5A CN114974826A (en) 2021-02-26 2021-02-26 Switching power supply module structure

Publications (1)

Publication Number Publication Date
CN114974826A true CN114974826A (en) 2022-08-30

Family

ID=82972604

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110218840.5A Withdrawn CN114974826A (en) 2021-02-26 2021-02-26 Switching power supply module structure

Country Status (1)

Country Link
CN (1) CN114974826A (en)

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Application publication date: 20220830

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