LLC topology magnetic integration high-frequency transformer

Abstract

The utility model discloses an LLC topology magnetic integration high-frequency transformer, which comprises a transformer framework, magnetic cores, a primary winding and a secondary winding, and is characterized in that the magnetic cores comprise a first U-shaped magnetic core, a second U-shaped magnetic core and an E-shaped magnetic core, and the first U-shaped magnetic core and the second U-shaped magnetic core are encircled in pairs to form a magnetic circuit; the E-shaped magnetic core is arranged on the side portion of the magnetic circuit and divides the magnetic circuit into a first bypass and a second bypass. The novel UUE type magnetic core is adopted, primary and secondary coupling magnetic circuits are blocked through the E-shaped middle column, the leakage inductance of the transformer is increased, and an external resonant inductor is omitted. An external resonant inductor of an LLC topological framework is omitted, the transformer structure is simplified, the process is simplified, and high-efficiency voltage conversion of the transformer is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field especially relates to a LLC topology magnetic integrated high frequency transformer. BACKGROUND

[0002] LLC topology circuit is a kind of through control switch frequency realizes output voltage constant resonant circuit;Generally by isolation transformer and resonant inductance element composition;Isolation transformer and resonant inductance are independent of each other, as two separate components, so that power supply structure is complex, volume increases, cost is high;It is not conducive to the application of the driving power supply of small size.

[0003] Another scheme is to integrate resonant inductance in transformer in magnetic integrated transformer, by treating transformer leakage inductance as resonant inductance and resonant capacitor in circuit, load constitutes resonant circuit;Such as authorized announcement No.CN106373751B Chinese invention patent, high frequency transformer, invention is formed by setting leakage magnetic core, bypass magnetic circuit is formed in high frequency transformer, thereby increasing leakage inductance, reducing production process and wiring complexity, improve the efficiency and stability of resonant power supply.

[0004] With the miniaturization of electronic equipment, the transformer used by its power supply is also smaller and smaller, due to space constraints, it is necessary to further miniaturize, simplify and lower the cost of the transformer, such as the transformer required in the LED driving circuit of tens of watts, which needs to be smaller in size and simpler in installation steps, the above-mentioned transformer cannot be reduced in size and cannot be well applied. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of LLC topology magnetic integrated high frequency transformer, adopt new UUE type magnetic core, by E type middle column blocking primary-secondary coupling magnetic circuit, increase transformer leakage inductance and save external resonant inductance. Realize the external resonant inductance of LLC topology architecture is saved, both simplify transformer structure and simplify process, guarantee the high efficiency voltage conversion of transformer.

[0006] The above technical purpose of the utility model is realized by the following technical scheme: a kind of LLC topology magnetic integrated high frequency transformer, including transformer skeleton, magnetic core, primary winding and secondary winding, characterized by: the magnetic core includes first U-shaped magnetic core, second U-shaped magnetic core and E-shaped magnetic core, the first U-shaped magnetic core and the second U-shaped magnetic core two two enclose and form magnetic circuit, the E-shaped magnetic core is arranged at the side of the magnetic circuit, and the magnetic circuit is divided into first bypass and second bypass.

[0007] The utility model further provides that: the transformer skeleton is provided with primary winding slot and secondary winding slot, and the primary winding slot and the secondary winding slot are arranged in parallel with each other.

[0008] The utility model discloses further provide: the hollow cavity is set on the transformer framework, and the magnetic arm of first U type magnetic core and the magnetic arm of second U type magnetic core are located in the hollow cavity respectively, and the magnetic arm of first U type magnetic core and the magnetic arm of second U type magnetic core form the magnetic circuit two by two.

[0009] The utility model discloses further provide: the second cavity is seted up on the transformer framework away from the first U type magnetic core and the second U type magnetic core one side, the second cavity with the hollow cavity perpendicularly, the second cavity with the hollow cavity intercommunication.

[0010] The utility model discloses further provide: the E type magnetic core's middle column is arranged in the second cavity, and the both ends magnetic arm of E type magnetic core abuts the first U type magnetic core and the second U type magnetic core respectively.

[0011] The utility model discloses further provide: the E type magnetic core's middle column is arranged in the second cavity, and the both ends magnetic arm of E type magnetic core abuts the first U type magnetic core and the second U type magnetic core respectively.

[0012] The utility model discloses further provide: the transformer framework is equipped with the base, and the base is equipped with primary pin foot part and secondary pin foot part, and the base and primary winding groove and secondary winding groove parallelly arranged.

[0013] The utility model discloses further provide: the both ends of first U type magnetic core and second U type magnetic core are spaced.

[0014] The utility model discloses further provide: the first U type magnetic core and the second U type magnetic core form the geometric body cross section of rectangle.

[0015] Compared with prior art, the utility model has the adoption novel UUE type magnetic core structure, and the E type middle column is blocked primary secondary coupling magnetic circuit, and the transformer leakage inductance is increased, and the external resonance inductance is saved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the three-dimensional view of LLC topology magnetic integrated high-frequency transformer in the embodiment.

[0017] Figure 2 It is the UUE type magnetic core structure diagram in the embodiment.

[0018] Figure 3is the transformer skeleton structure diagram in the embodiment.

[0019] Figure 4 is the front view of the LLC topology magnetic integrated high-frequency transformer in the embodiment.

[0020] Figure 5 is Figure 4 the A-A sectional view.

[0021] Figure 6 is the explosion view of the LLC topology magnetic integrated high-frequency transformer in the embodiment.

[0022] In the figure: 100, transformer skeleton; 101, primary winding slot; 102, secondary winding slot; 103, hollow cavity; 104, second cavity; 105, base; 106, primary pin part; 107, secondary pin part; 201, primary winding; 202, secondary winding; 301, first U-shaped magnetic core; 302, second U-shaped magnetic core; 303, E-shaped magnetic core; 304, middle column. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments in the present application belong to the scope of protection of the present application.

[0024] As shown in Figures 1-6 , an LLC topology magnetic integrated high-frequency transformer comprises a transformer skeleton 100, a magnetic core, a primary winding 201 and a secondary winding 202; a primary winding slot 101 and a secondary winding slot 102 are arranged on the transformer skeleton 100, the primary winding slot 101 and the secondary winding slot 102 are both arranged around the transformer skeleton 100, the primary winding slot 101 and the secondary winding slot 102 are parallel to each other, a primary winding coil is wound on the primary winding slot 101 to form the primary winding 201, and a secondary winding coil is wound on the secondary winding slot 102 to form the secondary winding 202; a hollow cavity 103 is arranged through the transformer skeleton 100, and the hollow cavity 103 is arranged perpendicularly to the primary winding slot 101 and the secondary winding slot 102 on the same section.

[0025] As shown in Figure 2 , the magnetic core in the embodiment is a UUE type, and the magnetic core comprises two U-shaped main magnetic cores and one E-shaped side magnetic core, namely a first U-shaped magnetic core 301, a second U-shaped magnetic core 302 and an E-shaped magnetic core 303, two end portions of the first U-shaped magnetic core 301 and the second U-shaped magnetic core 302 are correspondingly combined to form a magnetic circuit, the E-shaped magnetic core 303 is arranged at the side of the magnetic circuit, and the E-shaped magnetic core 303 divides the magnetic circuit into a first bypass and a second bypass.

[0026] As shown in Figure 4 , Figure 5 shown, the magnetic arms of the first U-shaped magnetic core 301 and the second U-shaped magnetic core 302 are inserted into the transformer skeleton 100 at both ends of the hollow cavity 103 in the embodiment, and the two ends of the first U-shaped magnetic core 301 and the second U-shaped magnetic core 302 are butted to form a magnetic circuit.

[0027] As shown in Figure 4 , a second cavity 104 is formed on the transformer skeleton 100 away from the first U-shaped magnetic core 301 and the second U-shaped magnetic core 302, the second cavity 104 is vertically arranged with the hollow cavity 103, and the second cavity 104 is in communication with the hollow cavity 103.

[0028] As shown in Figure 5 , the middle column 304 of the E-shaped magnetic core 303 is inserted into the second cavity 104, and the two end magnetic arms of the E-shaped magnetic core 303 abut against the first U-shaped magnetic core 301 and the second U-shaped magnetic core 302, respectively, and the middle column 304 of the E-shaped magnetic core 303 is separated from the first U-shaped magnetic core 301 and the second U-shaped magnetic core 302 to define an air gap. The E-shaped magnetic core 303 acts on the magnetic circuit formed by the primary winding 201, the secondary winding 202, and the first U-shaped magnetic core 301 and the second U-shaped magnetic core 302 on the transformer skeleton 100, forms a bypass magnetic circuit, and generates and increases the leakage inductance.

[0029] In the embodiment, the transformer skeleton 100 is provided with a base 105, the base 105 is provided with a primary pin portion 106 and a secondary pin portion 107, the primary pin portion 106 is provided with a primary pin, and the secondary pin portion 107 is provided with a secondary pin, the primary pin is connected with the primary winding 201, and the secondary pin is connected with the secondary winding 202.

[0030] In the embodiment, the primary winding slot 101 and the secondary winding slot 102 are arranged in parallel with the base 105.

[0031] In other embodiments, the primary winding slot 101 and the secondary winding slot 102 are arranged perpendicularly to the base 105.

[0032] In other embodiments, changing the length of the middle column 304 of the E-shaped magnetic core 303 can change the leakage inductance value.

[0033] The basic principle of the utility model is that the magnetic integrated high-frequency transformer is that the primary coil is wound on the primary winding slot 101 of the frequency converter skeleton, the secondary coil is wound on the secondary winding slot 102 of the skeleton, the energy is transmitted through the UU-shaped magnetic core in the middle, the E-shaped magnetic core 303 on the side is used for blocking the magnetic field between the primary winding 201 and the secondary winding 202, increasing the leakage inductance of the transformer, thereby saving the external resonant inductor.

[0034] The transformer stores energy to the UU type magnetic core through the high frequency switch of the primary coil, and couples to the secondary coil through the magnetic core; in actual production, the turns ratio of the primary coil and the secondary coil can be changed to change the input voltage ratio, to increase or decrease the voltage, and then output through the secondary coil.

[0035] The magnetic integrated high frequency transformer blocks the primary-secondary coupling by changing the magnetic core structure, changes the magnetic core composed of two parts from the conventional EE, EF square to the UUE type composed of three parts (UU upper part and E type lateral part); the E type middle column 304 blocks the primary-secondary coupling magnetic circuit, increases the transformer leakage inductance and saves the external resonant inductor.

[0036] Meanwhile, the height of the middle column 304 of the lateral E type magnetic core 303 can be adjusted to adjust the leakage inductance value and control the LLC working frequency during the manufacturing process; thus, the original simple winding method is ensured, the transformer leakage inductance does not need to be adjusted by complex process, the production is convenient, and the high efficiency of the transformer voltage conversion is ensured.

[0037] The above is only the preferred embodiment of the present application, so equivalent changes or modifications made according to the structure, features and principles described in the patent application range of the present application are included in the patent application range of the present application.

Claims

1. A magnetic integrated high-frequency transformer of LLC topology, comprising a transformer skeleton (100), a magnetic core, a primary winding (201) and a secondary winding (202), characterized in that: The magnetic core comprises a first U-shaped magnetic core (301), a second U-shaped magnetic core (302) and an E-shaped magnetic core (303), the first U-shaped magnetic core (301) and the second U-shaped magnetic core (302) enclose a magnetic circuit in pairs, and the E-shaped magnetic core (303) is arranged on the side of the magnetic circuit to divide the magnetic circuit into a first bypass and a second bypass.

2. The magnetic integrated LLC high frequency transformer of claim 1, wherein: The transformer frame (100) is provided with a primary winding slot (101) and a secondary winding slot (102), and the primary winding slot (101) and the secondary winding slot (102) are arranged in parallel with each other.

3. The magnetic integrated LLC high frequency transformer of claim 1, wherein: The transformer frame (100) is provided with a hollow cavity (103) penetrating through, and the magnetic arms of the first U-shaped magnetic core (301) and the second U-shaped magnetic core (302) are located in the hollow cavity (103) respectively, and the magnetic arms of the first U-shaped magnetic core (301) and the second U-shaped magnetic core (302) enclose a magnetic circuit in pairs.

4. The magnetic integrated LLC high frequency transformer of claim 3, wherein: The transformer frame (100) is provided with a second cavity (104) away from one side of the first U-shaped magnetic core (301) and the second U-shaped magnetic core (302), the second cavity (104) is arranged vertically with the hollow cavity (103), and the second cavity (104) is communicated with the hollow cavity (103).

5. The magnetic integrated LLC high frequency transformer of claim 4, wherein: The middle column (304) of the E-shaped magnetic core (303) is arranged in the second cavity (104), and the two end magnetic arms of the E-shaped magnetic core (303) abut against the first U-shaped magnetic core (301) and the second U-shaped magnetic core (302) respectively.

6. The magnetic integrated LLC high frequency transformer of claim 5, wherein: The middle column (304) of the E-shaped magnetic core (303) is spaced apart from the first U-shaped magnetic core (301) and the second U-shaped magnetic core (302) to form an air gap.

7. The LLC topology magnetic integrated high-frequency transformer according to claim 1, characterized in that: The transformer frame (100) is provided with a base (105), the base (105) is provided with a primary pin portion (106) and a secondary pin portion (107), and the base (105) is arranged in parallel with the primary winding slot (101) and the secondary winding slot (102).

8. The magnetic integrated LLC high frequency transformer of claim 1, wherein: The geometric cross section enclosed by the first U-shaped magnetic core (301) and the second U-shaped magnetic core (302) is rectangular.

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