Double-groove LLC transformer
By designing a dual-slot LLC transformer and utilizing a dual-wire parallel winding structure of the primary pin and N2 and N3 windings, the problem of insufficient secondary pins in existing LLC transformers is solved, achieving cost control and EMI design optimization, and reducing leakage inductance.
Patent Information
- Application Number
- CN202423319165.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The existing LLC transformers have insufficient pins on the secondary winding, which necessitates the addition of additional bobbin pins, increasing manufacturing costs.
Design a dual-slot LLC transformer that makes reasonable use of the excess primary pins by connecting them to the primary pins through the terminals of the N4 winding, and adopts a dual-wire parallel winding structure of the N2 and N3 windings to avoid increasing the secondary pins, thereby controlling the frame cost and optimizing the EMI design.
Without increasing the cost of the frame, the contact surface between the primary and secondary windings is effectively eliminated, which is helpful for EMI design. The combination of the clip and the slot facilitates assembly and reduces leakage inductance.
Smart Images
Figure CN223784987U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to LLC transformer technical field especially is a double slot LLC transformer. BACKGROUND
[0002] The transformer is the device that utilizes electromagnetic induction's principle to change AC voltage, main component is primary coil, secondary coil and core, main function has: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilizing etc.
[0003] By use can be divided into: power transformer and special transformer (furnace, rectifier, power frequency test transformer, voltage regulator, mine, audio transformer, medium frequency transformer, high frequency transformer, impact transformer, instrument transformer, electronic transformer, electric reactor, mutual inductor etc.), circuit symbol is commonly used T as the beginning of the number, example: T01, T201 etc.
[0004] With the progress of science and technology and the development of electronic technology, more and more electronic equipment needs to use transformer element, and LLC transformer embodies the incomparable advantage of ordinary series resonant transformer and parallel resonant transformer with the ability of no-load working capacity and resonant tank current reflecting load, so it has been widely used.
[0005] The hanging pin of the N4 winding of the existing LLC transformer is generally on the secondary, but the original pin number is not enough, so it is necessary to separately and additionally increase new pins on the framework to hang the pin, which greatly increases the cost of framework manufacturing.
[0006] Therefore, in the utility model patent application, the applicant carefully studies a double slot LLC transformer to solve the above problems. CONTENT OF THE UTILITY MODEL
[0007] The utility model mainly aims at providing a double slot LLC transformer, which reasonably utilizes the excess primary pins, realizes the need for no additional secondary pins on the basis of a limited number of pins, thereby avoiding the increase in the cost of the framework, and effectively eliminates the two contact surfaces of the primary winding in the sandwich winding method, which is beneficial to EMI design.
[0008] To achieve the above purpose, the utility model adopts the following technical scheme:
[0009] A double slot LLC transformer, comprising a framework, N1 winding, N2 winding, N3 winding, N4 winding and E-shaped magnetic core set, the framework comprises a main body, the main body is in a cylindrical structure and is provided with a hollow cavity extending from front to back, and the E-shaped magnetic core set is configured to be inserted into the hollow cavity of the main body.
[0010] The first insulating layer is further included, the main body includes a first section and a second section connected in sequence from front to back, the front end and the rear end of the main body are respectively provided with a first base and a second base, the first base is arranged at the bottom of the first section, the bottom of the first base is provided with pins 1, 2, 4 and 5 arranged at intervals, and the pins 1, 2, 4 and 5 are arranged in sequence from right to left;
[0011] The second base is arranged at the bottom of the second section, and the bottom of the second base is provided with pins 6, 8, 9 and 10 arranged at intervals, and the pins 6, 8, 9 and 10 are arranged in sequence from left to right;
[0012] The N1 winding is a primary winding, which is wound on the first section, and the two connection terminals of the N1 winding are connected with the pins 4 and 5 respectively;
[0013] The N2 winding, the N3 winding and the N4 winding are all secondary windings, the N2 winding and the N3 winding are wound on the second section in parallel, the two connection terminals of the N2 winding are connected with the pins 6 and 10 respectively, the two connection terminals of the N3 winding are connected with the pins 8 and 9 respectively, and the wires of the N2 winding and the N3 winding are wound on the second section in a double-wire parallel winding mode;
[0014] The first insulating layer is wrapped on the periphery of the N2 winding and the N3 winding;
[0015] The N4 winding is wound on the periphery of the first insulating layer on the second section, and the two connection terminals of the N4 winding are connected with the pins 1 and 2 respectively; and the wire of the N4 winding is a three-layer insulated wire.
[0016] As a preferred solution, the second insulating layer is arranged between the N1 winding and the first section, the second insulating layer is arranged on the first section, and the N1 winding is wound on the second insulating layer.
[0017] As a preferred solution, the bottom of the first base is further provided with two first limiting columns arranged at intervals along the left-right direction, and the pins 1, 2, 4 and 5 are located between the two first limiting columns.
[0018] As a preferred solution, the bottom of the second base is further provided with two second limiting columns arranged at intervals along the left-right direction, and the pins 6, 8, 9 and 10 are located between the two second limiting columns.
[0019] As a preferred solution, the bottom of the second base is further provided with a first auxiliary limiting column, a second auxiliary limiting column and a third auxiliary limiting column arranged at intervals along the left-right direction, and the first auxiliary limiting column, the second auxiliary limiting column and the third auxiliary limiting column are located between the two second limiting columns.
[0020] Pin 6 is located between the second limiting post and the first auxiliary limiting post at the left end; pin 8 is located between the first auxiliary limiting post and the second auxiliary limiting post; pin 9 is located between the second limiting post and the third auxiliary limiting post at the left end; and pin 10 is located between the second limiting post and the third auxiliary limiting post at the right end.
[0021] As a preferred embodiment, the frame further includes a partition and a first blocking member and a second blocking member disposed on the main body;
[0022] The dividing part is annularly protruding on the outer wall of the main body and divides the main body into a first segment and a second segment;
[0023] The first blocking member is disposed at the front end of the first segment, the second blocking member is disposed at the rear end of the second segment, and a secondary winding groove is formed between the second blocking member, the second segment and the separator, and the N2 winding, N3 winding and N4 winding are located in the secondary winding groove.
[0024] As a preferred embodiment, it also includes a housing for snapping onto the skeleton;
[0025] The first segment is provided with a first limiting member and a second limiting member arranged sequentially at intervals;
[0026] The first limiting member and the first blocking member are spaced apart, forming a first slot. The second limiting member and the separating part are spaced apart, forming a second slot. A primary winding groove is formed between the first limiting member, the second limiting member and the first segment, and the N1 winding is located in the primary winding groove.
[0027] The outer casing is provided with a first snap-fit edge and a second snap-fit edge, the first snap-fit edge snapping into a first snap-fit groove, and the second snap-fit edge snapping into a second snap-fit groove.
[0028] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, it mainly uses the two terminals of the N4 winding wound on the second section to be respectively connected to pin 1 and pin 2 of the first base of the first section. It makes reasonable use of the excess primary pins and achieves the goal of not needing to add secondary pins on the basis of a limited number of pins, thus not increasing the cost of the skeleton. Moreover, the winding structure of the N2 winding and N3 winding with two wires wound in parallel effectively eliminates the two contact surfaces of the primary winding and the primary winding in the sandwich winding method to a certain extent, which is beneficial to EMI design.
[0029] Secondly, the combination of multiple locking edges and slots facilitates the assembly of the frame and shell;
[0030] Furthermore, the design of the second slot creates a distance between the primary and secondary windings, which helps to reduce leakage inductance.
[0031] To more clearly illustrate the structural features and effects of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description
[0032] Figure 1 This is a schematic diagram of the three-dimensional assembly structure of an embodiment of the present utility model;
[0033] Figure 2 This is a three-dimensional assembly structure schematic diagram of another embodiment of the present utility model;
[0034] Figure 3 This is an exploded structural diagram of an embodiment of the present utility model;
[0035] Figure 4 This is a partial cross-sectional structural schematic diagram of an embodiment of the present invention (mainly showing the N1 winding, N2 winding, N3 winding and N4 winding);
[0036] Figure 5 This is a schematic diagram of the skeleton structure of an embodiment of the present utility model;
[0037] Figure 6 This is a schematic diagram of the skeleton structure from another angle according to an embodiment of this utility model.
[0038] Explanation of icon numbers:
[0039] 10. Skeleton 101. Hollow Cavity
[0040] 11. First paragraph
[0041] 111. First limiting component; 112. Second limiting component
[0042] 113. Primary winding slot
[0043] 12. Second section 121, secondary winding slot
[0044] 13. Separator 14. First blocking element
[0045] 141. First card slot; 142. Second card slot
[0046] 15. Second blocking component; 16. First base
[0047] 161. First limiting post
[0048] 17. Second base
[0049] 171. Second limiting post; 172. First auxiliary limiting post
[0050] 173. Second auxiliary limit post; 174. Third auxiliary limit post
[0051] 21. N1 winding 22. N2 winding
[0052] 23. N3 winding; 24. N4 winding
[0053] 251. First magnetic core; 252. Second magnetic core
[0054] 26. First insulating layer 27. Second insulating layer
[0055] 30. Outer shell
[0056] 31. First card joint edge 32. Second card joint edge. Detailed Implementation
[0057] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0058] like Figures 1 to 6 As shown, the dual-slot LLC transformer includes a bobbin 10, an N1 winding, an N2 winding 22, an N3 winding 23, an N4 winding 24, an E-shaped magnetic core assembly, a first insulating layer 26, and a housing 30 for engaging the bobbin 10.
[0059] The frame 10 includes a main body, a partition 13, and a first blocking member 14 and a second blocking member 15 disposed on the main body. The main body has a cylindrical structure and a hollow cavity 101 extending through the front and rear. The E-shaped magnetic core assembly is configured to be inserted into the hollow cavity 101 of the main body. In this embodiment, the E-shaped magnetic core assembly includes a first magnetic core 251 and a second magnetic core 252. The first magnetic core 251 is inserted into the hollow cavity 101 from the front opening of the main body, and the second magnetic core 252 is inserted into the hollow cavity 101 from the rear opening of the main body.
[0060] The main body includes a first segment 11 and a second segment 12 connected sequentially from front to back. In this embodiment, the dividing part 13 is annularly protruding on the outer wall of the main body and the dividing part 13 divides the main body into the first segment 11 and the second segment 12;
[0061] The first segment 11 is provided with a first limiting member 111 and a second limiting member 112 arranged sequentially at intervals;
[0062] The first limiting member 111 and the first blocking member 14 are spaced apart, forming a first slot 141. The second limiting member 112 and the separating part 13 are spaced apart, forming a second slot 142. A primary winding groove 113 is formed between the first limiting member 111, the second limiting member 112 and the first segment 11, and the N1 winding is located in the primary winding groove 113.
[0063] The outer casing 30 is provided with a first snap-fit edge 31 and a second snap-fit edge 32. The first snap-fit edge 31 is snapped into the first snap-fit groove 141, and the second snap-fit edge 32 is snapped into the second snap-fit groove 142.
[0064] The front and rear ends of the main body are respectively provided with a first base 16 and a second base 17.
[0065] The first base 16 is disposed at the bottom of the first segment 11. The bottom of the first base 16 is provided with pins 1, 2, 4 and 5 arranged at intervals along the left and right directions. Pins 1, 2, 4 and 5 are arranged sequentially from right to left.
[0066] In this embodiment, the bottom of the first base 16 is provided with two first limiting posts 161 arranged at intervals in the left and right direction, and the pins 1, 2, 4 and 5 are located between the two first limiting posts 161.
[0067] The first blocking member 14 is disposed at the front end of the first segment 11, the second blocking member 15 is disposed at the rear end of the second segment 12, and a secondary winding groove 121 is formed between the second blocking member 15, the second segment 12 and the separator 13, and the N2 winding 22, N3 winding 23 and N4 winding 24 are located in the secondary winding groove 121.
[0068] The second base 17 is disposed at the bottom of the second segment 12. The bottom of the second base 17 is provided with pins 6, 8, 9 and 10 arranged at intervals along the left and right directions. The four pins 6, 8, 9 and 10 are arranged sequentially from left to right.
[0069] In this embodiment, the bottom of the second base 17 is provided with two second limiting posts 171, a first auxiliary limiting post 172, a second auxiliary limiting post 173 and a third auxiliary limiting post 174 arranged at intervals in the left and right direction, and the pins 6, 8, 9 and 10 are located between the two second limiting posts 171.
[0070] The first auxiliary limiting post 172, the second auxiliary limiting post 173, and the third auxiliary limiting post 174 are located between the two second limiting posts 171;
[0071] Pin 6 is located between the second limiting post 171 and the first auxiliary limiting post 172 on the left end; pin 8 is located between the first auxiliary limiting post and the second auxiliary limiting post 173; pin 9 is located between the second limiting post 171 and the third auxiliary limiting post 174 on the left end; and pin 10 is located between the second limiting post 171 and the third auxiliary limiting post 174 on the right end.
[0072] The N1 winding is the primary winding, which is wound on the first segment 11. In this embodiment, to prevent burrs on the first segment 11 from causing loss of the N1 winding wire, a second insulation layer 27 is provided. Specifically, a second insulation layer 27 is provided between the N1 winding and the first segment 11, the second insulation layer 27 covers the first segment 11, and the N1 winding is wound on the second insulation layer 27. Preferably, the N1 winding is made of multi-strand enameled wire.
[0073] The two terminals of the N1 winding are connected to pin 4 and pin 5, respectively.
[0074] The N2 winding 22, N3 winding 23 and N4 winding 24 are all secondary windings. The N2 winding 22 and N3 winding 23 are wound in parallel on the second section 12. The two terminals of the N2 winding 22 are connected to pin 6 and pin 10 respectively, and the two terminals of the N3 winding 23 are connected to pin 8 and pin 9 respectively. One strand of the N2 winding 22 and one strand of the N3 winding 23 are wound on the second section 12 in a double-wire parallel winding manner.
[0075] The first insulating layer 26 simultaneously covers the periphery of both the N2 winding 22 and the N3 winding 23;
[0076] The N4 winding 24 is wound around the outer periphery of the first insulating layer 26 on the second segment 12. The two terminals of the N4 winding 24 are respectively connected to pin 1 and pin 2. The winding of the N4 winding 24 is a triple-insulated wire, which increases the withstand voltage of the N4 winding.
[0077] Both the first insulating layer 26 and the second insulating layer 27 are made of insulating tape. Preferably, the insulating tape is a pressure-sensitive insulating tape. The pressure-sensitive insulating tape has good adhesion, peel resistance, certain tensile strength, good insulation performance, good pressure resistance, flame retardancy, high temperature resistance, and high dielectric strength.
[0078] The key design feature of this utility model is that it mainly uses the two terminals of the N4 winding wound on the second section to be connected to pins 1 and 2 of the first base of the first section, respectively. It makes reasonable use of the excess primary pins and achieves the goal of not adding secondary pins on the basis of a limited number of pins, thus not increasing the cost of the skeleton. Moreover, the winding structure of the N2 winding and N3 winding in parallel with two wires effectively eliminates the two contact surfaces of the primary winding and the primary winding in the sandwich winding method to a certain extent, which is beneficial to EMI design.
[0079] Secondly, the combination of multiple locking edges and slots facilitates the assembly of the frame and shell;
[0080] Furthermore, the design of the second slot creates a distance between the primary and secondary windings, which helps to reduce leakage inductance.
[0081] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.
Claims
1. A double-slot LLC transformer, comprising a frame, N1 winding, N2 winding, N3 winding, N4 winding, and E-shaped magnetic core assembly, wherein the frame comprises a main body, the main body having a cylindrical structure and a hollow cavity extending through the front and rear, and the E-shaped magnetic core assembly being configured to be inserted into the hollow cavity of the main body, characterized in that: It also includes a first insulating layer. The main body includes a first segment and a second segment connected in sequence. The front and rear ends of the main body are respectively provided with a first base and a second base. The first base is located at the bottom of the first segment. The bottom of the first base is provided with pins 1, 2, 4 and 5 arranged at intervals. Pins 1, 2, 4 and 5 are arranged in sequence from right to left. The second base is located at the bottom of the second segment. The bottom of the second base is provided with pins 6, 8, 9 and 10 arranged at intervals, arranged from left to right. The N1 winding is the primary winding, which is wound on the first section. The two terminals of the N1 winding are connected to pin 4 and pin 5 respectively. The N2, N3, and N4 windings are all secondary windings. The N2 and N3 windings are wound in parallel on the second section. The two terminals of the N2 winding are connected to pin 6 and pin 10 respectively, and the two terminals of the N3 winding are connected to pin 8 and pin 9 respectively. One strand of the N2 winding and one strand of the N3 winding are wound on the second section in a double-wire parallel winding manner. The first insulating layer covers the periphery of both the N2 winding and the N3 winding; The N4 winding is wound around the outer periphery of the first insulation layer on the second section, and the two terminals of the N4 winding are respectively connected to pin 1 and pin 2; the winding of the N4 winding is a triple-insulated wire.
2. The dual-slot LLC transformer according to claim 1, characterized in that: A second insulating layer is provided between the N1 winding and the first section, the second insulating layer covers the first section, and the N1 winding is wound on the second insulating layer.
3. The dual-slot LLC transformer according to claim 1, characterized in that: The bottom of the first base is also provided with two first limiting posts arranged at intervals in the left and right direction, and pins 1, 2, 4 and 5 are located between the two first limiting posts.
4. The dual-slot LLC transformer according to claim 1, characterized in that: The bottom of the second base is also provided with two second limiting posts arranged at intervals in the left and right direction, and pins 6, 8, 9 and 10 are located between the two second limiting posts.
5. The dual-slot LLC transformer according to claim 4, characterized in that: The bottom of the second base is also provided with a first auxiliary limiting post, a second auxiliary limiting post and a third auxiliary limiting post arranged at intervals in the left and right direction, and the first auxiliary limiting post, the second auxiliary limiting post and the third auxiliary limiting post are located between the two second limiting posts; Pin 6 is located between the second limiting post and the first auxiliary limiting post at the left end; pin 8 is located between the first auxiliary limiting post and the second auxiliary limiting post; pin 9 is located between the second limiting post and the third auxiliary limiting post at the left end; and pin 10 is located between the second limiting post and the third auxiliary limiting post at the right end.
6. The dual-slot LLC transformer according to claim 1, characterized in that: The frame also includes a partition and a first blocking member and a second blocking member disposed on the main body; The dividing part is annularly protruding on the outer wall of the main body and divides the main body into a first segment and a second segment; The first blocking member is disposed at the front end of the first segment, the second blocking member is disposed at the rear end of the second segment, and a secondary winding groove is formed between the second blocking member, the second segment and the separator, and the N2 winding, N3 winding and N4 winding are located in the secondary winding groove.
7. The dual-slot LLC transformer according to claim 6, characterized in that: It also includes a housing for snapping onto the skeleton; The first segment is provided with a first limiting member and a second limiting member arranged sequentially at intervals; The first limiting member and the first blocking member are spaced apart, forming a first slot. The second limiting member and the separating part are spaced apart, forming a second slot. A primary winding groove is formed between the first limiting member, the second limiting member and the first segment, and the N1 winding is located in the primary winding groove. The outer casing is provided with a first snap-fit edge and a second snap-fit edge, the first snap-fit edge snapping into a first snap-fit groove, and the second snap-fit edge snapping into a second snap-fit groove.