TWM552661U - Resonant transformer with leakage inductance adjustment - Google Patents

Description

Resonant transformer with leakage inductance adjustment

This creation is about a resonant transformer, especially a resonant transformer with adjustable leakage inductance and used as a diamagnetic transformer for leakage inductance adjustment at very low leakage.

In the power supply system of electronic products such as LCD TVs, the high efficiency and easy fabrication of the LLC architecture has gradually become a trend, using the leakage inductance of the main transformer to replace the external resonant inductor, further simplifying the LLC architecture, and gradually becoming the mainstream, integration. The leakage inductance of the LLC transformer itself is converted into a resonant inductor, which reduces one power component and reduces the power consumption, thereby improving the efficiency. The ZVS characteristic of the LLC architecture can reduce the loss of the switch and reduce the noise.

The leakage inductance is caused by the fact that the coupling coefficient between the primary side coil and the secondary measuring coil in the transformer is less than 1, so that the transformer part coil does not have a transformer function. The inductance generated by this part of the coil is the leakage inductance; The basic formula of the transformer is ω = 1 / √ (LC), where ω is the angular frequency of the power supply = 2πf, L and C are the inductance and capacitance of the LLC resonant tank. The resonant frequency f is often set differently for different applications. In order to meet the requirements of different resonant frequencies f, L and C must be adjustable. In order to accurately find the resonance point, the parameters can be steplessly fine-tuned, but the actual situation is This is not possible. Therefore, modern resonant transformers generally use a variable frequency power supply as a power source to adjust the value of ω, but it is not possible to directly adjust the Lk from the inside of the resonant transformer, resulting in an inability to effectively improve the efficiency of the resonant transformer.

Although some manufacturers have improved the structure of the resonant transformer, it can generate more leakage inductance, such as the Republic of China Patent Announcement No. M333646 "Structural Improvement of Leakage Resonant Transformer", and the Republic of China Patent Announcement No. M416553 "Resonant Transformer Structure", etc. And the creator has announced the patent case, the Republic of China Patent Notice No. I556273 "Resonant high current density transformer", but this type of resonant transformer is limited by the size, weight and other restrictions, so the fixed size, size Under the coil ratio, the leakage inductance of such a resonant transformer is limited to the structure, cannot be adjusted at will, and cannot meet the power supply system of different powers. Furthermore, in order to supply power supply systems for different leakage inductance requirements, the operator must have the same structure. In order to produce the required leakage inductance, but often the leakage variability has a limited range, can not fully meet the design, can only match the existing transformer through the line tradeoff and can not effectively improve the performance of the resonant transformer.

In addition, as in the Republic of China Patent Publication No. I442420 "Transformer structure that can increase leakage inductance", this patent is only inserted into the second winding portion of the first winding portion through the vertical magnetic core in a transformer capable of generating leakage inductance. Between, the leakage inductance is generated. However, the vertical core only increases the leakage inductance. The leakage inductance cannot be precisely adjusted for the resonance frequency requirement, and the vertical magnetic core is too small to insert the operation, which increases the assembly difficulty. The first winding part and the second winding part of the matched bobbin make the height of the transformer cannot be effectively reduced, and flattening cannot be achieved; further, the vertical magnetic core is inserted into the first winding part and the second winding part In the interval section in which the axial direction is vertically disposed, the distance between the first winding portion and the second winding portion and the vertical core is too close, and the problem of insulation failure is likely to occur.

In view of the above shortcomings in the use of the above, the creator is studying the improvement of the aforementioned shortcomings, and finally the creation of this creation.

The main purpose of this creation is to provide a leaky tone that can adjust the leakage inductance. The entire resonant transformer.

Another secondary object of the present invention is to provide a resonant transformer with a leakage inductance adjustment capable of extracting a magnetic conductive sheet.

A further object of the present invention is to provide a resonant transformer with leakage inductance adjustment for use as a diamagnetic transformer in extremely low leakage.

In order to achieve the above object and effect, the structure of the present invention comprises: a primary-stage side winding having a coil bobbin having a first perforation therein, and the coil bobbin is provided with a receiving portion, and a plurality of positioning posts are arranged in the receiving portion; a primary side winding on the bobbin having a second through hole communicating with the first through hole; a magnetic conductive sheet disposed in the receiving portion of the bobbin having a first through hole and a second a through hole communicating with the through hole, a plurality of positioning notches corresponding to the positioning column respectively disposed around the magnetic conductive piece; and a core group having two symmetrically disposed first iron cores and a second iron core, the primary side winding arrangement On the bobbin of the secondary side winding, the magnetic conductive sheet is placed in the receiving portion of the bobbin, the first core is sleeved on the top of the primary side winding, and the second core is sleeved on the bottom of the primary side winding, so that the resonant transformer is In operation, the desired leakage inductance is generated via the aforementioned magnetic conductive sheet.

According to the above structure, each of the first core and the second core has a side wall at each end of the surface, and a convex portion is formed between the two side portions, and the convex portion passes through the first through hole and the second through Perforations and through holes.

According to the above structure, the device further includes two elastic pieces, each of which has a hook portion at both ends, and a concave portion is respectively disposed at each of the two ends of the first iron core and the second iron core, and the elastic pieces are respectively hooked by hooks. a recess of the first core and the second core.

According to the above structure, the receiving portion is disposed at the top of the bobbin, and the receiving portion is circumferential The side ring is provided with a wall plate, and the magnetic conductive piece and the primary side winding are respectively disposed in the accommodating portion, and the insulation is formed by covering the periphery with the wall plate.

According to the above structure, the accommodating portion is disposed in the bobbin to form a slot, and the slot is provided for the magnetic permeable sheet to be disposed therein.

According to the above structure, the accommodating portion is provided at least two or more, wherein one accommodating portion is provided with a top portion of the re-coil frame, and a peripheral wall of the accommodating portion is provided with a wall plate, and another accommodating portion is disposed in the bobbin. When a slot is formed, the plurality of magnetic conductive sheets are plural and are respectively disposed in the receiving portions.

According to the above structure, the size of the via hole of the magnetic conductive sheet is inversely proportional to the leakage inductance generated by the resonant transformer, the thickness of the magnetic conductive sheet is proportional to the leakage inductance generated by the resonant transformer, and the magnetic permeability and resonance of the magnetic conductive sheet The leakage inductance generated by the transformer is proportional.

In order to obtain a more specific understanding of the above purposes, functions and features of this creation, the following figures are described as follows:

1‧‧‧Resonant transformer

2‧‧‧iron core group

21‧‧‧First core

211‧‧‧ Sidewall

212‧‧‧ convex

213‧‧‧ recess

22‧‧‧second core

221‧‧‧ Sidewall

222‧‧‧ convex

223‧‧‧ recess

3‧‧‧Secondary side winding

31‧‧‧ coil holder

32‧‧‧First perforation

33‧‧‧ siding

34‧‧‧Slots

35‧‧‧Secondary side coil

36‧‧‧The Department of Housing

37‧‧‧Positioning column

4‧‧‧Primary side winding

41‧‧‧Second perforation

42‧‧‧primary side coil

5‧‧‧ magnetic guide

51‧‧‧through hole

52‧‧‧ Positioning gap

6‧‧‧Shrap

61‧‧‧Hook

Figure 1 is a perspective view of a preferred embodiment of the present invention.

Figure 2 is an exploded perspective view of a preferred embodiment of the present invention.

Figure 3 is a cross-sectional view of a preferred embodiment of the present invention.

Figure 4 is an exploded perspective view of still another preferred embodiment of the present invention.

Figure 5 is a cross-sectional view showing still another preferred embodiment of the present invention.

Figure 6 is a data diagram of the leakage inductance and the magnetic permeable sheet of the preferred embodiment of the present invention.

Referring to Figures 1 to 3, it can be seen that the structure of the present invention mainly includes: a core group 2, a primary side winding 3, a primary side winding 4, a magnetic conductive sheet 5 and two elastic pieces 6, wherein: The second side winding 3 has a bobbin 31. The bobbin 31 has a first through hole 32. The bobbin 31 is provided with a receiving portion 36. The outer portion of the receiving portion 36 is provided with a wall plate 33. The positioning post 37 is further provided with a secondary side coil 35 in the coil bobbin 31; the primary side winding 4 has a second through hole 41 therein, the second through hole 41 communicates with the first through hole 32, and the primary side winding 4 is wound around A primary side coil 42 is disposed; the magnetic conductive sheet 5 has a through hole 51 therein, and a plurality of positioning notches 52 are disposed around the magnetic conductive sheet 5; the core group 2 has two symmetrically disposed first cores 21 and The second core 22 has a side wall portion 211 and 221 at both ends of the surface of the first core 21 and the second core 22, and a convex portion 212, 222 is formed between the two side walls 211 and 221, and is first. a recess 213, 223 is respectively disposed at both ends of the other side surface of the core 21 and the second core 22; and A leaf spring 6 having a hook portion 61 at both ends.

When the above members are combined, the magnetic permeable sheet 5 is disposed in the bobbin 31 of the secondary side winding 3, and it should be noted that the so-called arrangement allows the magnetic permeable sheet 5 to be placed on the bobbin 31 or placed on the bobbin 31, or a plurality of magnetic conductive sheets 5 are respectively disposed on the top and the inside of the bobbin 31. In the present embodiment, the magnetic conductive sheets 5 are placed in the accommodating portion 36 of the bobbin 31, and the accommodating portion 36 is disposed in the coil. The top of the frame 31 has a wall plate 33. Then, the primary side winding 4 is disposed in the receiving groove 35 and stacked on the magnetic conductive sheet 5, and the positioning notch 52 around the magnetic conductive sheet 5 is placed on the positioning post 37 of the receiving portion 36. Therefore, the magnetic conductive sheet 5 is not displaced in the receiving groove 35, and the through hole 51 of the magnetic conductive sheet 5, the first through hole 32 of the secondary side winding 3 and the second through hole 41 of the primary side winding 4 are mutually Connected; as in the aforementioned first core 21 The second core 22 is sleeved on the top of the primary winding 4, and the sidewalls 211 and 221 on both sides of the first core 21 and the second core 22 are respectively wrapped on the secondary winding 3. The side, and the protrusions 212 and 222 on both sides of the first core 21 and the second core 22 respectively pass through the first through hole 32, the second through hole 41 and the through hole 51, so that the core group 2 forms a complete magnetic path; The first core 21 and the second core 22 of the core group 2 are connected by gluing, and the hooks 61 at the two ends of the elastic piece 6 can be hooked into the first core 21 and the second core 22, respectively. The concave portions 213 and 223 allow the resonant transformer 1 to be disassembled and then replace the magnetic conductive sheets 5 of different sizes of the through holes 51.

The magnetic flux in the transformer that is interconnected with both the primary winding and the secondary winding is called a mutual flux (or main flux, Φ12 or Φ21). In addition to the magnetic flux of the transformer, there is a primary side leakage flux (or self-flux Φσ1) that is only interconnected with the primary winding and is not interconnected with the secondary winding, and is only interconnected with the secondary winding. The secondary side leakage flux (Φσ2) that is not interconnected with the primary winding. Because there is magnetic leakage in the transformer, there must be leakage flux. And because the leakage flux is only interconnected with one winding and the secondary winding, that is, this means that the inductance of each winding is added thereto. Therefore, the primary side leakage flux is a primary side leakage inductance, and the secondary side leakage magnetic flux is a secondary side leakage inductance; The coupling coefficient k, the self-inductance of the primary winding is L1, and the self-inductance of the secondary winding is L2, and the leakage inductance is: Le1=(1-k). L1

Le2=(1-k). L2

The resonant transformer 1 of the present invention is different from the traditional transformer. The characteristic is that the leakage inductance can be steplessly adjusted according to the demand, which can be large or small, can be specially designed according to the requirements, and the coupling coefficient is determined by the leakage inductance. Parameter, coupling coefficient, in the circuit, to show the degree of tightness of the coupling between components, the actual mutual inductance (absolute value) between the two inductive components and its maximum pole The ratio of the limit values is defined as a coupling coefficient, so the resonant voltage divider 1 of the present invention places the magnetic permeable sheet 1 in the bobbin 31, and the magnetic permeable sheet 5 changes the relationship between the secondary side coil 35 and the primary side coil 42. The coupling coefficient, and the magnetic conductive sheet 5 is magnetically permeable. The structure of the conventional transformer is such that the leakage magnetic flux between the primary and secondary sides surrounds the coil, causing great eddy current loss, and the magnetic flux is used to conduct the leakage magnetic flux back. The iron core can completely avoid the generation of eddy current loss, and the efficiency can be greatly improved.

The magnetic permeable sheet 5 is disposed in the bobbin 31 of the secondary side winding 3, so that when the resonant transformer 1 is in operation, the magnetic flux is generated by the magnetic permeable sheet 5 to generate a desired leakage inductance, and the resonant transformer 1 and the magnetic permeable sheet are provided. 5, the relationship of leakage inductance, please refer to Figure 6, as can be seen in the figure, the size of the through hole 51 of the magnetic conductive sheet 5 is inversely proportional to the leakage inductance generated by the resonant transformer 1, when the through hole 51 is larger, The smaller the leakage inductance generated by the resonant transformer 1 is, on the contrary, the smaller the through hole 51 is, the larger the leakage inductance generated by the resonant transformer 1 is, and the thickness of the magnetic permeable sheet 5 is different from that of the resonant transformer 1 except for the size of the through hole 51. The leakage inductance is proportional, and the magnetic permeability of the magnetic conductive sheet 5 is proportional to the leakage inductance generated by the resonant transformer 1; when the magnetic conductive sheet 5 is not disposed in the resonant transformer 1, the leakage inductance generated by the resonant transformer 1 is relatively small. It can be neglected in the circuit application, so that the resonant transformer 1 can be equivalently used as a diamagnetic transformer. Therefore, it can be known that the resonant transformer 1 of the present invention is a diamagnetic transformer that does not have a leakage inductance application, and is connected to the magnetic permeable sheet 5 Thereafter, the resonant transformer 1 whose leakage inductance can be adjusted is formed.

Please refer to FIGS. 4 and 5 for an exploded perspective view and a cross-sectional view of a preferred embodiment of the present invention. The embodiment of the present embodiment is characterized by the above-described first to third embodiments. In the present embodiment, the accommodating portion 36 is disposed in the bobbin 31 to form a slot 34. The slot 34 is internally provided with a plurality of positioning posts 37 for the magnetic permeable sheets 5 Set inside. In addition to the foregoing embodiments, the secondary winding 3 may further be provided with a plurality of magnetic sheets 5 and a plurality of receiving portions 36. As can be seen from the foregoing embodiments, the top of the bobbin 31 of the secondary winding 3 has Receive The receiving portion 36 of the slot 34 is disposed in the receiving portion 36 of the slot portion 34, and the positioning post 37 is disposed in the receiving portion 36 of the receiving slot 36 and the slot portion 34, so that a larger leakage inductance is required. The plurality of magnetic conductive sheets 5 are placed in the receiving portion 36 of the receiving groove 36 and the slot 34, respectively, so that the resonant transformer 1 generates a larger leakage inductance.

In summary, the resonant transformer with leakage inductance adjustment of this creation is a novel and progressive creation, and the application for patent creation is filed according to law; however, the content of the above description is only a description of the preferred embodiment of the present creation. Any changes, modifications, alterations or equivalent substitutions extended by the technical means and scope of this creation shall fall within the scope of the patent application of this creation.

1‧‧‧Resonant transformer

2‧‧‧iron core group

21‧‧‧First core

211‧‧‧ Sidewall

212‧‧‧ convex

213‧‧‧ recess

22‧‧‧second core

221‧‧‧ Sidewall

222‧‧‧ convex

223‧‧‧ recess

3‧‧‧Secondary side winding

31‧‧‧ coil holder

32‧‧‧First perforation

33‧‧‧ siding

35‧‧‧Secondary side coil

36‧‧‧The Department of Housing

37‧‧‧Positioning column

4‧‧‧Primary side winding

41‧‧‧Second perforation

42‧‧‧primary side coil

5‧‧‧ magnetic guide

51‧‧‧through hole

52‧‧‧ Positioning gap

6‧‧‧Shrap

61‧‧‧Hook

Claims (7)

A resonant transformer with leakage inductance adjustment, comprising at least: a primary-stage side winding having a coil bobbin having a first through hole therein, and the coil bobbin is provided with a receiving portion, wherein the plurality of positioning posts are disposed in the receiving portion; a primary side a winding disposed on the bobbin of the secondary side winding, having a second through hole therein, the second through hole communicating with the first through hole; a magnetic conductive piece disposed in the receiving portion of the coil former, surrounding the magnetic conductive piece a plurality of positioning notches are provided, the inside of which has a through hole, the through hole communicates with the first through hole and the second through hole; and a core group has two symmetrically disposed first iron cores and a second iron core, and the first iron core sleeve The second core is disposed on the top of the primary side winding, and the second core is sleeved on the bottom of the primary side winding; thereby, the magnetic conductive sheet is disposed in the receiving portion of the bobbin, and the positioning notches of the magnetic conductive sheet respectively correspond to positioning a column, the magnetic conductive piece is smoothly fixed in the accommodating portion, the primary side winding is disposed on the secondary side winding, and the first iron core and the second iron core are sleeved up and down, so that the resonant transformer is in operation Generating a desired intensity via the leakage inductance of the magnetic sheets. The resonant transformer with leakage inductance adjustment according to claim 1, wherein the first core and the second core have a side wall at each end of the surface, and a convex portion is formed between the two side portions. The protrusions pass through the first through hole, the second through hole and the through hole, respectively. The resonant transformer with leakage inductance adjustment according to claim 1, further comprising two elastic pieces, each of the elastic pieces having a hook portion at both ends, and the first core and the second core are disposed at opposite ends of the second core A recess is not provided, and the elastic piece is respectively hooked into the concave portion of the first core and the second core by a hook portion. A resonant transformer with leakage inductance adjustment as described in claim 1 of the patent application, wherein the The receiving portion is disposed on the top of the bobbin, and a wall plate is disposed around the ring of the receiving portion. The magnetic conductive sheet and the primary side winding are respectively disposed in the receiving portion, and the insulating layer is formed by covering the periphery of the wall plate. The resonant transformer with leakage inductance adjustment according to claim 1, wherein the receiving portion is disposed in the bobbin to form a slot, wherein the slot is provided with the magnetic conductive sheet disposed therein. The resonant transformer with leakage inductance adjustment according to claim 1, wherein the accommodating portion is provided at least two or more, wherein one accommodating portion is disposed at the top of the bobbin, and a wall of the accommodating portion is provided with a wall. The plate and the other receiving portion are disposed in the bobbin to form a slot, and the plurality of magnetic conductive sheets are disposed in the plurality of receiving portions. The resonant transformer with leakage inductance adjustment according to claim 1, wherein the size of the through hole of the magnetic conductive sheet is inversely proportional to the leakage inductance generated by the resonant transformer, and the thickness of the magnetic conductive sheet and the leakage inductance generated by the resonant transformer are In proportion, as well, the magnetic permeability of the magnetically permeable sheet is proportional to the leakage inductance generated by the resonant transformer.