Combined transformer and framework thereof

Abstract

The utility model discloses a combined transformer which comprises a square shell and a framework which is arranged in the shell and provided with a magnetic core and a coil winding, the number of terminal pins of the framework is more than six, the combined transformer further comprises a PCB (printed circuit board), the top surface and one side surface of the shell are provided with openings, and the outer wall opposite to the side surface of the opening is provided with two vertically downward metal pins; through holes are formed in the positions, corresponding to the terminal pins of the framework, of the PCB, and after the framework is installed in the shell from the opening in the top face of the shell, the terminal pins of the framework penetrate out of the opening in the side face of the shell and are inserted and welded in the through holes of the PCB. And a thick tooth-shaped golden finger is arranged at the lower end of the PCB. According to the utility model, the isolation effect of the transformer shell and the winding framework is utilized, and meanwhile, the PCB is utilized for switching, so that the safety distance is met, the size of the transformer is reduced, and a plurality of winding leads are solved.

Description

Technical Field

[0001] The utility model relates to the field of transformer design, in particular to a combined transformer and a skeleton thereof suitable for a small volume, high power density and multiple windings. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are a primary coil, a secondary coil, a bobbin, and a magnetic core. It is used within power modules for energy conversion and electrical isolation. As power modules require smaller size and higher power density, the demand for transformers is also decreasing.

[0003] To ensure reinforced insulation between the primary and secondary sides of the transformer within the power module, safety regulations require that the creepage distance and electrical clearance between the primary and secondary sides meet the minimum values for reinforced insulation. Furthermore, in a small transformer, the primary coil has four windings and the secondary coil has one winding, so the primary side requires eight pins and the secondary side requires two pins. Existing technology can only meet this requirement through flying wire technology or by increasing the transformer bobbin size, which complicates the manufacturing process. Furthermore, the transformer is too large, making it unsuitable for small, high-power-density power modules. Utility Model Content

[0004] The purpose of the utility model is to provide a combined transformer that reduces the size of the transformer while meeting safety distance requirements, solves the layout problem of multiple winding pins, and is conducive to the miniaturization design of the power module.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0006] A combined transformer comprises a square housing and a skeleton mounted within the housing and equipped with a magnetic core and coil windings. The skeleton has six or more terminal pins. The transformer also comprises a PCB board. The top surface and one side surface of the housing are provided with openings, and two metal pins extending vertically downward are provided on the outer wall opposite the side opening. The PCB board has through-holes at positions corresponding to the terminal pins of the skeleton. After the skeleton is installed into the housing through the top opening, the terminal pins of the skeleton extend through the side opening of the housing and are inserted and soldered into the through-holes of the PCB board. The lower end of the PCB board is provided with coarse-toothed gold fingers.

[0007] Preferably, the edge of the side opening of the shell is provided with a flange vertically outward.

[0008] Preferably, the terminal pins of the skeleton are arranged in two rows, one of which is provided with positioning pins.

[0009] Preferably, the number of the terminal pins of the skeleton is 8, which are arranged in two rows, pass through the side opening of the shell and are inserted and welded in the through holes of the PCB board.

[0010] Preferably, the number of solder fingers at the lower end of the PCB board is 4.

[0011] Preferably, the metal pin lead-out portion of the housing is provided with a groove and a winding post for guiding and fixing the winding wire end.

[0012] Preferably, the terminal pins of the skeleton are arranged on the terminal pin seats of the skeleton, and baffles are provided at both ends of the winding column. The two terminal pin seats of the skeleton are respectively connected to the baffles at both ends of the winding column. There is an empty part between the two terminal pin seats, and the center hole of the winding column is arranged parallel to the terminal platform.

[0013] Preferably, the magnetic core is a pair of E-shaped magnetic cores, and the middle column of the magnetic core is assembled into the central hole of the winding column of the skeleton.

[0014] The utility model also provides a skeleton, which is suitable for the above-mentioned combined transformer, including a terminal block and a winding post, with baffles provided at both ends of the winding post, and the terminal block is provided with two rows of terminal pin seats. The number of terminal pins of the skeleton is more than 6, and the two rows of terminal pin seats of the terminal block are respectively connected to the baffles at both ends of the winding post. There is an empty part between the two rows of terminal pin seats of the terminal block, and the center hole of the winding post is arranged parallel to the terminal block, so that the skeleton can be installed into the shell from the top opening of the shell, and the terminal pins of the skeleton can pass through the side opening of the shell.

[0015] Preferably, the upper end of the baffle of the winding column is provided with a baffle wall which is vertically bent outward.

[0016] Compared with the prior art, the combined transformer and its skeleton of the utility model have the following beneficial effects:

[0017] 1. By increasing the transformer casing, the safety distance between the secondary coil winding and the magnetic core is increased. There is no need to increase the transformer boss or fly wires to meet the safety distance. This can reduce the size of the transformer and improve the manufacturing process. At the same time, the secondary side devices can be closely arranged around the transformer without increasing the safety distance.

[0018] 2. The skeleton has multiple metal pins, which can meet the needs of multiple primary coil windings. By side welding with the PCB board, the commutation switching effect can be achieved. At the same time, the primary side electronic components can be arranged on the transfer PCB board, making full use of the vertical space of the transformer, improving space utilization, and further reducing the size of the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional diagram of the combined transformer of the utility model;

[0020] Figure 2 A three-dimensional diagram of the combined transformer of the present invention from another perspective;

[0021] Figure 3 This is an exploded diagram of the combined transformer of the utility model;

[0022] Figure 4 A three-dimensional diagram of the housing of the combined transformer of the present invention;

[0023] Figure 5 A three-dimensional diagram of the skeleton of the combined transformer of the present utility model;

[0024] Figure 6 This is a three-dimensional diagram of the PCB board of the combined transformer of the present utility model.

[0025] The descriptions of the accompanying drawings are as follows:

[0026] 1a Housing, 1b Winding bobbin, 2 Magnetic core, 3 PCB board, 4 Primary and secondary coils, 131 Outwardly extending surface of rear baffle, 132 Metal pin, 133 Groove, 134 Left baffle, 135 Right baffle, 136 Rear baffle, 137 Bottom baffle, 138 Flange, 14 Terminal pin, 15 Positioning pin, 16 Wire trough, 17 Retaining wall, 18 Terminal pin seat, 19 Baffle, 100 Hole, 110 Center hole, 111 Winding area, 112 Winding column, 31 Solder hole, 32 Positioning hole, 33 Tin finger DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0028] See also Figures 1 to 6 , which are three-dimensional and exploded views of a combined transformer according to the present invention, include a square housing 1a and a bobbin 1b mounted within the housing and equipped with a magnetic core and coil windings. The bobbin has six or more terminal pins 14. The transformer also includes a PCB board 3. The housing 1a has openings on its top and one side. Two metal pins 132 extending vertically downward are provided on the outer wall opposite the side opening (i.e., the rear baffle 136). The PCB board 3 has through-holes 31 at positions corresponding to the terminal pins of the bobbin. After the bobbin 1b is installed into the housing 1a through the top opening, the terminal pins 14 of the bobbin extend through the side opening of the housing and are inserted and soldered into the through-holes 31 of the PCB board. The lower end of the PCB board 3 is provided with coarse-toothed gold fingers.

[0029] like Figure 4FIG. 1 is a perspective view of the housing of the combined transformer of the present invention. Preferably, the edge of the side opening of the housing 1a is provided with a flange 138 extending vertically outward. The metal pins 132 of the housing are provided with grooves 133 and winding posts at the lead-out points for guiding and positioning the winding wire ends.

[0030] like Figure 5 The figure shows a three-dimensional view of the bobbin of the combined transformer of the present invention. The bobbin 1b includes a terminal block and a winding post 112 (illustrated pointing to the same location as the winding area 111, where the real portion represents the winding post 112 and the imaginary portion represents the space outside the winding post, i.e., the winding area 111). Baffles 19 are provided at both ends of the winding post. The terminal block is provided with two rows of terminal pin holders 18, which are connected to the baffles 19 at both ends of the winding post. A hollow portion 100 is defined between the two rows of terminal pin holders 18, corresponding to the winding area of the winding post. This hollow portion 100 connects to the winding area 111 of the winding post. The central hole of the winding post is arranged parallel to the terminal block. The bobbin's terminal pins 14 are provided on the bobbin's terminal pin holders 18. Preferably, the bobbin has eight terminal pins arranged in two rows, extending from the side opening of the housing 1a and being inserted and soldered into through-holes 31 of the PCB. One row of terminal pin holders is provided with locating pins 15. The combined transformer's magnetic core 2 is a pair of E-shaped cores, the center leg of which is inserted into the center hole 110 of the bobbin's winding post. The upper end of the winding post's baffle 19 is provided with a vertically curved outward retaining wall 17.

[0031] like Figure 6 FIG. 1 is a perspective view of the PCB board of the combined transformer of the present invention, wherein the number of solder fingers at the lower end of the PCB board is 4. The solder fingers are the solder pads on the gold fingers.

[0032] The utility model discloses a combined transformer, comprising a shell, a frame, and a PCB board. A magnetic core and a coil winding with multiple windings are assembled on the frame. The transformer shell comprises a left baffle, a right baffle, a rear baffle, and a bottom plate. The four baffles form a cavity. The rear baffle has two metal pins for welding secondary coil winding leads. A groove is provided near the metal pins for fixing the secondary winding leads. The terminal pin seats of the frame are arranged in two rows. The winding area corresponding to the winding column between the two terminal pin seats is an empty area. The secondary coil winding is led out from the interval empty area between the frame and the shell and welded to the metal pins of the shell. Finally, the PCB board is welded to the metal pins of the winding frame, and the PCB board is used to perform reversing switching of the frame terminal pins to form a combined transformer. The utility model utilizes the isolation effect of the transformer shell and the winding frame and utilizes the PCB board for switching. While meeting the safety distance, the overall volume of the transformer is reduced and the problem of leading out multiple winding leads is solved.

[0033] Specific as Figure 1The figure shows a three-dimensional assembly diagram of the combined transformer of the utility model (viewing angle 1). Figure 2 This is a three-dimensional assembly diagram of the utility model combined transformer from another perspective (perspective 2). Figure 3 This is an exploded view of the combined transformer of the present invention. In this combined transformer, the housing 1a is equipped with a left baffle 134, a right baffle 135, a rear baffle 136, and a bottom baffle 137. These four baffles form a cavity. The rear baffle 136 has an outwardly extending surface structure 131, which forms a cavity with the winding bobbin 1b for the secondary winding lead. The housing 1a of the combined transformer is equipped with two metal pins 132 on either side of the rear baffle for welding to the secondary winding lead wires. Two grooves 133 are also provided near the metal pins for positioning and guiding the secondary lead wires.

[0034] The winding bobbin 1b is embedded with eight metal terminal pins 14, arranged in two rows at the bottom of the terminal pin holder. A locating pin 15 is located at the bottom of one row of terminal pin holders to prevent misalignment when assembled with the PCB 3. The winding bobbin 1b is equipped with a wire groove 16 to secure the primary winding wire during winding and prevent damage to the primary coil. The primary side can accommodate four windings.

[0035] The magnetic core 2 is mounted on the upper and lower ends of the winding frame 1 b , respectively. The winding frame is provided with retaining walls 17 on the left and right sides for limiting the magnetic core 2 .

[0036] The PCB board 3 is provided with a welding hole 31 corresponding to the metal pin of the winding frame 1b, and a positioning hole 32 is provided at the same time, which is used to cooperate with the positioning pin 15 of the frame. A tin finger 33 is provided at the bottom of the PCB board 3 for welding.

[0037] The combined transformer bobbin, consisting of the housing 1a and the winding bobbin 1b, increases the safety distance between the transformer core and the secondary side. The metal pins of the winding bobbin 1b are soldered to the PCB, allowing multiple windings to be accommodated within a limited space. This saves space within the power module and improves the transformer's consistency and reliability.

[0038] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Without departing from the scope of protection of the purpose of the present invention and the claims, it can also be fixed in other ways, which all fall within the protection of the present invention.

Claims

1. A combined transformer comprising a square housing and a frame mounted within the housing and equipped with a magnetic core and coil windings, the frame having six or more terminal pins, characterized in that: Also includes PCB board, The top surface and one side surface of the housing are provided with openings, and the outer wall opposite to the side opening is provided with two metal pins pointing vertically downwards; The PCB board is provided with through holes at positions corresponding to the terminal pins of the skeleton. After the skeleton is installed into the shell from the top opening of the shell, the terminal pins of the skeleton pass through the side opening of the shell and are inserted and soldered into the through holes of the PCB board; the lower end of the PCB board is provided with coarse-toothed gold fingers.

2. The combined transformer according to claim 1, characterized in that: The edge of the side opening of the shell is provided with a flange vertically outward.

3. The combined transformer according to claim 1, characterized in that: The terminal pins of the frame are arranged in two rows, one of which is provided with positioning pins.

4. The combined transformer according to claim 1, characterized in that: The number of terminal pins of the skeleton is 8, which are arranged in two rows, pass through the side opening of the shell and are inserted and welded in the through holes of the PCB board.

5. The combined transformer according to claim 1, characterized in that: The number of solder fingers at the lower end of the PCB board is 4.

6. The combined transformer according to claim 1, characterized in that: The metal pin lead-out portion of the housing is provided with a groove and a winding post for guiding and fixing the winding wire end.

7. The combined transformer according to claim 1, characterized in that: The terminal pins of the skeleton are arranged on the terminal pin seats of the skeleton, and baffles are provided at both ends of the winding column. The two terminal pin seats of the skeleton are respectively connected to the baffles at both ends of the winding column. There is an empty part between the two terminal pin seats, and the center hole of the winding column is arranged parallel to the terminal platform.

8. The combined transformer according to claim 1, characterized in that: The magnetic core is a pair of E-shaped magnetic cores, and the middle column of the magnetic core is assembled into the central hole of the winding column of the frame.

9. A bobbin, suitable for the combined transformer according to any one of claims 1 to 8, comprising a terminal block and a winding post, wherein baffles are provided at both ends of the winding post, the terminal block is provided with two rows of terminal pin seats, the number of terminal pins of the bobbin is 6 or more, and characterized in that: The two rows of terminal pin seats on the terminal block are respectively connected to the baffles at both ends of the winding column. There is a hollow space between the two rows of terminal pin seats on the terminal block. The center hole of the winding column is arranged parallel to the terminal block, so that the skeleton can be inserted into the shell from the top opening of the shell, and the terminal pins of the skeleton can pass through the side opening of the shell.

10. The skeleton according to claim 9, characterized in that: The upper end of the baffle of the winding column is provided with a baffle wall which is vertically bent outwards.

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