Surface-mounted transformer and switching power supply
By using a surface-mount transformer with a combined magnetic core and optimized electrode pin design, the problems of large size and low withstand voltage in switching power supplies are solved, achieving miniaturization, high withstand voltage and low cost, making it suitable for high isolation applications.
Patent Information
- Application Number
- CN202423261189.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-27
AI Technical Summary
In existing switching power supplies, transformers occupy a large area of the board, have high costs, and low withstand voltage requirements, making it difficult to meet the needs of miniaturization and high withstand voltage. Conventional magnetic core self-frame transformer designs are also limited.
It adopts a combined magnetic core structure, including I-type magnetic sheets and I-type magnetic sheets. The winding is wound on the magnetic core column of the I-type magnetic sheet. The electrode pins are designed as "L"-shaped pin pads, which increases the pad area and moves it away from the winding coil. Combined with insulation layer treatment, the creepage distance and winding structure are optimized to achieve a high withstand voltage design.
This technology enables the miniaturization and high voltage withstand capability of transformers, allowing them to withstand voltage requirements of 3000VAC and arc detection. It also reduces costs and expands the range of applications, making it suitable for high isolation applications.
Smart Images
Figure CN223815691U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to magnetic component technology field especially relates to a novel magnetic core's patch type transformer and switching power supply. BACKGROUND
[0002] In switching power supply, transformer is used as the device of isolating primary and secondary sides, in order to meet the corresponding safety and voltage resistance requirements, usually the primary and secondary sides are isolated and fixed by using framework, which makes the area of the designed transformer usually very large, and the relative cost is higher, does not meet the development demand of miniaturization, integration, low cost of switching power supply. And the conventional magnetic core self-framework transformer on the market usually designs low voltage resistance requirement, generally meets 2KVDC voltage resistance, lacks high voltage resistance, small size transformer design, and the application is limited. SUMMARY
[0003] In view of the above problems, the utility model aims at overcoming at least one of the above prior art, providing a novel magnetic core self-framework transformer, which reduces the volume of the product by removing the traditional framework, and meets the high voltage resistance requirement of the product by the design of the magnetic core, wire and the like, and is suitable for the switching power supply product with high requirements of patching, integration and automation.
[0004] In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:
[0005] A patch type transformer, comprising a magnetic core and a winding, the magnetic core is a combined magnetic core composed of an I-shaped magnetic sheet and an I-shaped magnetic sheet, the I-shaped magnetic sheet is composed of two side walls and a magnetic core column arranged between the side walls, the winding is wound on the magnetic core column of the I-shaped magnetic sheet, and the side wall bottom surface of the I-shaped magnetic sheet is provided with an electrode pin, the electrode pin of the I-shaped magnetic sheet extends from the middle of the side wall bottom surface of the I-shaped magnetic sheet to the side edge, forming an L-shaped pin pad wrapped outside the side edge of the I-shaped magnetic sheet, so as to increase the electrode pin pad area and be farther away from the winding wire package.
[0006] Preferably, the thickness of the side wall of the I-shaped magnetic sheet is greater than 1.0mm, and the minimum creepage distance of the electrode pin of the I-shaped magnetic sheet from the starting end of the side wall bottom surface of the I-shaped magnetic sheet to the winding wire package is greater than or equal to 1.3mm.
[0007] Preferably, the minimum creepage distance of the electrode pin of the I-shaped magnetic sheet from the end of the side wall side edge to the I-shaped magnetic sheet is greater than or equal to 2.5mm.
[0008] Preferably, the thickness of the I-shaped magnetic sheet is greater than or equal to 0.8mm.
[0009] Preferably, the surface of the patch type transformer is formed with an insulating layer covering the surface by impregnation treatment after assembly and molding.
[0010] Preferably, the wire heads of the winding wire package are welded on the electrode pins of the I-shaped magnetic sheet respectively, and the overall size of the chip transformer is not greater than length* width* height: 9mm*6mm*7mm.
[0011] Preferably, the core column of the I-shaped magnetic sheet is in the shape of a cylinder, a cuboid with chamfered corners or a square with chamfered corners, and the overall size of the chip transformer is not greater than length* width* height: 8.5mm*5.45mm*6.9mm.
[0012] Preferably, the wire material of the winding wire package comprises a conductor and an insulating paint layer; the conductor is copper, aluminum or copper-clad aluminum; the insulating paint layer is made of one or more of acetal paint, polyester paint, polyamide-imide paint and polyurethane paint; the material of the I-shaped magnetic sheet is manganese-zinc ferrite, nickel-zinc ferrite, iron-silicon magnetic powder core, iron-silicon-aluminum magnetic powder core, iron-nickel magnetic powder core, iron-nickel-molybdenum magnetic powder core or ceramic; and the material of the I-shaped magnetic sheet is nickel-zinc ferrite or ceramic.
[0013] Preferably, the working power of the chip transformer is less than or equal to 3W, and the chip transformer can withstand a voltage requirement of 3000VAC and / or arc detection.
[0014] The utility model also provides a switching power supply which comprises the chip transformer as described above, and the switching power supply can withstand a voltage requirement of 3000VAC and / or arc detection.
[0015] Compared with the prior art, the chip transformer and the switching power supply have the following beneficial effects:
[0016] 1. The chip transformer of the utility model omits the framework, and the winding is directly wound on the magnetic core, thereby increasing the winding window of the magnetic core and greatly reducing the volume of the transformer.
[0017] 2. Through the selection of raw materials such as the transformer magnetic core and the wire material, and the systematic optimization design of the distance between the electrodes, the distance between the electrodes and the wire package, the distance between the magnetic core I-shaped sheet and the wire package and the winding structure, the optimal design of the creepage distance between the magnetic core electrode and the winding wire package in a high-isolation application scenario is realized, so that the no-framework transformer can meet the voltage requirement of 3000VAC and / or arc detection through systematic optimal design, thereby greatly improving the voltage resistance of the conventional 600VAC transformer when the length change is not more than 2 times, and further enabling the no-framework transformer to be applied to more scenarios. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 Fig. 1 is a perspective view of the chip transformer of the utility model;
[0019] Figure 2 Fig. 2 is a perspective view of the I-shaped magnetic sheet of the chip transformer of the utility model;
[0020] Figure 3 Figure 1 is a perspective view of a winding of a patch transformer according to the present application.
[0021] In the above-mentioned figures, the reference signs are explained as follows:
[0022] 10. I-shaped magnetic sheet, 20. I-shaped magnetic sheet, 21. magnetic core column, 22. magnetic core side wall 30. winding, 40. electrode pin DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the drawings and examples.
[0024] Please see Figure 1 Figure 1 is a perspective view of a winding of a patch transformer according to the present application. The patch transformer comprises a magnetic core and a winding. The magnetic core is a combined magnetic core, which is composed of an I-shaped magnetic sheet 10 and an I-shaped magnetic sheet 20. The I-shaped magnetic sheet is composed of two side walls 22 and a magnetic core column 21 arranged between the side walls. The winding 30 is wound on the magnetic core column 21 of the I-shaped magnetic sheet. The side wall bottom surface of the I-shaped magnetic sheet is provided with an electrode pin 40. The electrode pin 40 extends from the middle of the side wall 22 bottom surface of the I-shaped magnetic sheet to the side edge, forming an "L"-shaped pin pad wrapped around the outer side edge corner of the I-shaped magnetic sheet. The electrode pin pad area is increased while being further away from the winding wire package, thereby improving the voltage resistance of the transformer and eliminating the electric arc.
[0025] Preferably, the thickness of the side wall 22 of the I-shaped magnetic sheet is greater than 1.0 mm. The minimum creepage distance of the electrode pin 40 from the starting end of the side wall bottom surface of the I-shaped magnetic sheet to the winding wire package is greater than or equal to 1.3 mm. The minimum creepage distance of the electrode pin 40 from the end of the side edge of the side wall of the I-shaped magnetic sheet to the I-shaped magnetic sheet 10 is greater than or equal to 2.5 mm. The thickness of the I-shaped magnetic sheet 10 is greater than or equal to 0.8 mm. The shape of the magnetic core column 21 of the I-shaped magnetic sheet is a cylindrical body, a rectangular body with chamfered corners or a square body with chamfered corners. The wire heads of the winding wire package are respectively welded on the electrode pins 40 of the I-shaped magnetic sheet. The overall size of the patch transformer is not greater than length* width* height: 9mm*6mm*7mm. Taking a 1-3W patch transformer sample as an example, the actual measurement of the overall size is not greater than length* width* height: 8.5mm*5.45mm*6.9mm.
[0026] The patch transformer comprises an I-shaped magnetic sheet 10, an I-shaped magnetic sheet 10, a winding magnetic core 20, a winding 30 and an electrode 40.
[0027] The winding 30 is wound on the middle column of the winding magnetic core 20, the number of the coil winding is not less than 1, and the wire end of the coil winding 30 is welded on the electrode pin 40.
[0028] The manufacturing process of the patch transformer is as follows:
[0029] The I-shaped magnetic sheet 10 and the winding magnetic core 20 are sintered by a sintering process;
[0030] The electrode pin 40 can be completed by one or more processes such as chemical electroplating, printing, magnetron sputtering or vapor deposition, and the starting positions of the electrode pins are located on the same plane.
[0031] After the electrode pin is completed, the winding 30 is wound on the middle column of the winding magnetic core 20, and then the end of the winding 30 is welded on the electrode pin 40; the electrode pin 40 with the winding 30 is electrically connected with the PCB board; after the welding of the winding 30 is completed, the I-shaped magnetic sheet 10 is assembled, and high-temperature glue is used for bonding and drying; finally, the transformer is treated by immersion to form an insulating layer covering the surface of the transformer, and thus the whole patch transformer is completed.
[0032] The utility model discloses a patch type transformer, through the improvement design of winding magnetic core, and the distance between electrode, the distance between electrode and wire package, the distance between magnetic core I piece and wire package, winding structure etc. system optimization design, realized the optimal design of the creepage distance of magnetic core electrode and winding wire package under high isolation application occasion, makes the electrode pin and winding wire package of no skeleton transformer through systematic optimal design can better guarantee the creepage distance, makes novel transformer can bear 3000VAC and / or arc detection voltage resistance requirement, and makes electrode pin position optimization, both increase the pad area and far away wire package, solve product reflow soldering loose and loose board problem, can also improve voltage resistance simultaneously. Thus make the existing conventional 600VAC transformer in length change not exceed 2 times case voltage resistance has the substantial promotion, further makes no skeleton transformer can be applied to more occasions.
[0033] It should be understood that the specific embodiments described herein are merely to explain the present application, and are not intended to limit the present application. Improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present application are also considered as the protection scope of the present application. The scope of the present application should be limited by the scope defined by the claims.
Claims
1. A surface-mount transformer, comprising a magnetic core and windings, wherein the magnetic core is a composite magnetic core composed of I-shaped magnetic sheets and I-shaped magnetic sheets, the I-shaped magnetic sheet being composed of two sidewalls and a core post disposed between the sidewalls, the windings being wound on the core post of the I-shaped magnetic sheet, and electrode leads being provided on the bottom surface of the sidewalls of the I-shaped magnetic sheet, characterized in that: The electrode pins of the I-shaped magnetic sheet extend from the middle of the bottom sidewall of the I-shaped magnetic sheet to the side, forming an "L"-shaped pin pad that wraps around the outer corner of the I-shaped magnetic sheet, which increases the area of the electrode pin pad while keeping it further away from the winding coil.
2. The surface mount transformer according to claim 1, characterized in that: The sidewall thickness of the I-shaped magnetic sheet is greater than 1.0 mm, and the minimum creepage distance from the starting end of the bottom sidewall of the I-shaped magnetic sheet to the winding coil is greater than or equal to 1.3 mm.
3. The surface mount transformer according to claim 1, characterized in that: The minimum creepage distance from the end of the electrode pin of the I-shaped magnetic sheet to the type I magnetic sheet at the side wall side is greater than or equal to 2.5 mm.
4. The surface mount transformer according to claim 1, characterized in that: The thickness of the type I magnetic sheet is greater than or equal to 0.8 mm.
5. The surface mount transformer according to claim 1, characterized in that: The surface of the patch transformer is subjected to an impregnation process after assembly to form an insulating layer covering its surface.
6. The surface mount transformer according to claim 1, characterized in that: The ends of the winding coils are respectively soldered to the electrode pins of the I-shaped magnetic sheet. The overall dimensions of the surface mount transformer are no greater than length * width * height: 9mm * 6mm * 7mm.
7. The surface mount transformer according to claim 1, characterized in that: The core column of the I-shaped magnetic sheet is cylindrical, cuboid with chamfers, or cube with chamfers. The overall dimensions of the surface mount transformer are no greater than length * width * height: 8.5mm * 5.45mm * 6.9mm.
8. The surface mount transformer according to claim 1, characterized in that: The winding coil includes a conductor and an insulating varnish layer; the conductor is copper, aluminum, or copper-clad aluminum; the material of the type I magnetic sheet is manganese-zinc ferrite, nickel-zinc ferrite, iron-silicon magnetic powder core, iron-silicon-aluminum magnetic powder core, iron-nickel magnetic powder core, iron-nickel-molybdenum magnetic powder core, or ceramic; the material of the I-shaped magnetic sheet is nickel-zinc ferrite or ceramic.
9. The surface mount transformer according to any one of claims 1 to 8, characterized in that: The surface-mount transformer has a working power of ≤3W and can withstand the withstand voltage requirements of 3000VAC and / or arc detection.
10. A switching power supply, characterized in that: Including the surface-mount transformer according to any one of claims 1 to 8, the switching power supply meets the withstand voltage requirements of 3000VAC and / or arc detection.