KR101372124B1 - Transformer with PFC - Google Patents

Abstract

An integrated PFC transformer according to an embodiment includes a primary core operating as a transformer; A secondary core formed on the side of the primary core and operating in PFC; And a tertiary core formed on one side of the primary and secondary cores, wherein the primary and secondary cores are formed to face each other based on the tertiary core.

Description

Integrated PFC Transformer {Transformer with PFC}

Embodiments relate to an integrated PFC transformer.

Recently, a power supply employing a Switching Mode Power Supply (SMPS) has attracted attention, and such a Switching Mode Power Supply is a metal oxide semiconductor field effect transistor (MOS FET) or a bipolar junction transistor (MOS FET). Switching devices such as BJTs (bipolar junction transistors) and transformers are used to provide stable power.

Conventional LED driving circuits have a power factor correction circuit (PFC) for satisfying harmonic regulation of AC commercial power from 50 Hz to 60 Hz, a transformer for satisfying safety standards, and a constant voltage or constant current control for driving an LED load. It consists of an LED driver.

Meanwhile, as household appliances and the like have been developed in a trend of light and short, the switching mode power supply is also required to be slimmer, and the volume of power factor correction circuit and transformer that occupies a large volume among the circuit components constituting the switching mode power supply are Research to reduce this is ongoing.

Since the integrated PFC transformer and the manufacturing method thereof according to the embodiment can manufacture the transformer slim, the power supply device including the transformer can be manufactured slim.

In addition, the production of PFC and transformer in one part can improve productivity.

An integrated PFC transformer according to an embodiment includes a primary core operating as a transformer; A secondary core formed on the side of the primary core and operating in PFC; And a tertiary core formed on one side of the primary and secondary cores, wherein the primary and secondary cores are formed to face each other based on the tertiary core.

Since the integrated PFC transformer according to the embodiment may make the transformer slim, the power supply device including the transformer may be made slim.

In addition, the production of PFC and transformer in one part can improve productivity.

1 is a block diagram of an LED driving circuit according to an embodiment of the invention.
2 is a LED driving circuit diagram according to an embodiment of the invention.
3 is a top view of a bobbin according to an embodiment of the invention.
4 is a cross-sectional view of a core according to an embodiment of the invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The details of other embodiments are included in the detailed description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. Like reference numerals refer to like elements throughout the specification.

1 is a block diagram of an LED driving circuit according to an embodiment of the invention.

Referring to FIG. 1, the LED driving circuit includes an AC power supply 80, a rectifier circuit 90, an integrated PFC transformer 100, an LED driver 200, and an LED load 300.

The rectifier circuit 90 rectifies the AC voltage from the AC power supply 80 and supplies it to the integrated PFC transformer 100. The integrated PFC transformer 100 improves the power factor of the AC voltage including the ripple voltage and converts it into a DC voltage higher than the rectified AC voltage. The integrated PFC transformer 100 converts the DC voltage and outputs the DC power of the load.

Since the primary and secondary coils included in conventional PFC (Power Factor Correction) reactors and LLC transformers are manufactured, there is room for improvement in miniaturization of the product. In the integrated PFC transformer 100 according to the embodiment of the present invention, the reactor and the primary and secondary coils of the PFC are integrally formed, and each core and bobbin applied to the reactor and the primary and secondary coils of the PFC are integrally formed. It can be integrated into one.

As a result, a power supply device including a transformer can be manufactured slim. In addition, the production of PFC and transformer in one part can improve productivity.

2 is an LED driving circuit diagram according to an embodiment of the invention. 3 is a top view of a bobbin according to an embodiment of the invention. 4 is a cross-sectional view of a core according to an embodiment of the invention.

Each node shown in FIG. 2 corresponds to a terminal formed to contact the bobbin of FIG. 3.

3 and 4, the integrated PFC transformer according to the embodiment of the present invention may include a first core 120, a second core 125, a third core 130, and a bobbin 110.

One side of the bobbin 110 may be formed of a PFC, the other side may be formed a transformer. In the drawing, the PFC may be implemented by the second core 125, and the transformer may be implemented by the first core 120.

Holes formed on the upper and lower surfaces of the bobbin 110 may overlap vertically.

A portion of the first core 120 and the second core 125 may be inserted through holes formed to correspond to the upper and lower surfaces of the bobbin 110.

That is, the first core 120 and the second core 125 may be formed to face each other on the top and bottom surfaces of the third core 130.

The bobbin 110 may be formed with a primary pin 151 for receiving a power signal of the rectifier circuit and a secondary pin 152 for outputting a power signal passed through the PFC winding unit 115. The 152 may be electrically connected to the power signal supply unit 211 of the transformer unit. A power signal output unit 311 may be formed at the other end of the bobbin 110.

The power signal supply unit 211 and the power signal output unit 311 may be formed in a bent form so as to be electrically connected to the printed circuit board, respectively, and each terminal may be electrically connected to one end of the primary or secondary coil. Can be.

The power signal supply unit 211 may be formed to be in contact with the bobbin 110 and may be provided of a metal material having high conductivity to supply the power signal to the primary winding unit 111 efficiently and smoothly.

That is, the power signal supply unit 211 is connected to one end of the primary coil through a contact pin, is disposed adjacent to the central axis of the bobbin 110, and outputs a power signal at a predetermined distance from the power signal supply unit 211. The unit 311 may be disposed.

The power signal output unit 311 may be provided to be electrically connected to the secondary winding unit 113 to output a power signal transformed by the secondary winding unit 113.

The power signal output unit 311 may be provided of a metal having high conductivity and may be provided to efficiently and smoothly output the power signal transformed through the secondary winding 113.

The PFC winding unit 115, the primary winding unit 111, and the secondary winding unit 113 may include a plurality of slits arranged at equal intervals, and coils are wound between the slits. As a result, the PFC and the transformer may be electrically connected.

The bobbin 110 may be made of polyphenylene sulfide (PPS), liquid crystalline polyester (LCP), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and phenolic resin.

The body of the bobbin 110 has a through hole penetrating in the longitudinal direction, and the third core 130 may be inserted into the through hole.

The bobbin 110 may have a first hole 131, a second hole 132, and a third hole 133, and the holes may be formed on the upper and lower surfaces of the bobbin 110. The second hole 132 may be formed in a larger area than the first hole 131 and the third hole 133, but is not limited thereto.

The first side part 127 of the second core 125 may be inserted into the first hole 131, and the second side part 126 of the second core 125 may be inserted into the second hole 132. ) And the first side part 121 of the first core 120 may be inserted. The second side portion 122 of the first core 120 may be inserted into the third hole 133.

The first and second holes 131 and 132 are formed on the upper and lower surfaces of the bobbin 110, and the first and second cores 120 and 125 are also upper surfaces of the bobbin 110. Since it is formed to correspond to each other and the lower surface, through the first hole 131 and the second hole 132 formed on the upper and lower surfaces of the bobbin 110 of the first core 120 and the second core 125 Some may be inserted.

The first side portion 127 and the second side portion 126 of the second core 125 and the first side portion 121 and the second side portion 122 of the first core 120 are the same or It may be formed in a different length, the short side is formed in the film 150 can be inserted to minimize the effect of the inductance. Accordingly, the current flowing in the primary side and the secondary side decreases, thereby reducing the thickness of the coil and reducing the heat generation loss.

The film 150 may be formed of an insulating material, and may include plastic, for example, polyester, but is not limited thereto.

The thickness of the film 150 may be formed corresponding to the volumes of the first core 120 and the second core 125.

When the film 150 is formed in the side portion, since only the film 150 is inserted without polishing the core of the formed portion, productivity may be improved.

The third core 130 may include a primary winding part 111 to which an AC voltage is applied from a power source, and a secondary winding part 113 disposed with the primary winding part 111 and the partition wall 119 therebetween. Equipped. The primary coil is wound around the primary winding 111, the secondary coil is wound around the secondary winding 113, and the secondary coil may be induced by a primary coil.

The influence of the voltage between the primary coil and the secondary coil wound around the primary winding part 111 and the secondary winding part 115 by the partition wall 119 may be minimized.

The primary winding 111 and the secondary winding 113 may be formed longer than the secondary winding 113 in consideration of the voltage drop.

The primary or secondary coil may be wound along the outer circumferential surface of the primary winding 111 or the secondary winding 113. The primary winding part 111 and the secondary winding part 113 may each have a plurality of slits arranged at equal intervals, and a primary coil or a secondary coil is wound between the slits.

The plurality of slits may be integrally formed during injection molding of the bobbin 110, may be formed to distribute the primary coil and the secondary coil at uniform intervals, and may prevent a short phenomenon between the respective coils. And prevent functional damage to the product.

The third core 130 may be formed to have an 'I' type structure, penetrate the body of the bobbin 110, and be bonded to the first core 120 and the second core 125. The third core 130 may be formed by inserting two cores of an 'I' type structure. In this case, the two third cores 130 are formed to be spaced apart from each other.

The first core 120 and the second core 125 may be provided as a pair, and may be inserted through the holes 131, 132, and 133 formed on one surface of the bobbin 110 to face each other.

The first core 120 and the second core 125 may be manufactured in a 'U' shape, and formed of Mn-Zn-based ferrite having high permeability, low loss, high saturation magnetic flux density, stability, and low production cost. It may be, but is not limited to the shape or material of the core.

As described above, the integrated PFC transformer 100 according to the embodiment of the present invention is formed by integrally forming the reactor and the primary and secondary coils of the PFC, and each core applied to the reactor and the primary and secondary coils of the PFC and It is advantageous to miniaturization and thinning because the bobbin is integrated and applied.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

Claims (13)

A primary core operating as a transformer;
A secondary core formed on the side of the primary core and operating in PFC; And
Includes; a tertiary core formed on one side of the primary and secondary cores,
The primary and secondary cores are formed to correspond to face each other based on the tertiary core,
The tertiary core,
A PFC winding formed in a region corresponding to the secondary core; And
An integrated PFC transformer comprising a primary side winding portion and a secondary side winding formed in a region corresponding to the primary core. The method of claim 1,
The tertiary core,
And a partition wall between the primary winding and the secondary winding. The method of claim 1,
The PFC windings, the primary and secondary windings are integral PFC transformer comprising a plurality of slits each disposed at equal intervals. The method of claim 1,
And the primary and secondary cores include a first side portion and a second side portion, and a film formed on at least one side of the side portion. The method of claim 1,
And a bobbin into which the tertiary core is inserted, wherein the bobbin is connected to one end of the PFC winding unit and is connected to one end of a PFC winding unit and one end pin is connected to one end of the PFC winding unit and receives a power signal; And a secondary pin connected to the other end of the PFC winding unit and outputting a power signal passing through the PFC winding unit. 6. The method of claim 5,
A power signal supply part formed on the bobbin and connected to the secondary pin and the primary winding part; And a power signal output part formed on the bobbin and connected to the secondary winding part. The method according to claim 6,
The power signal supply unit and the power signal output unit is integrally formed PFC transformer. 6. The method of claim 5,
The bobbin has an integrated PFC transformer having a hole formed in the upper and lower surfaces. 9. The method of claim 8,
And the primary and secondary cores are formed to contact the tertiary core through the holes. 9. The method of claim 8,
The integrated PFC transformer holes vertically overlapping the upper and lower surfaces of the bobbin. A tertiary core having a PFC winding, a primary winding, and a secondary winding;
A bobbin having a through hole penetrating in the longitudinal direction to insert the tertiary core;
A primary core formed in an area corresponding to the primary winding portion and the secondary winding portion; And
And a secondary core formed in a region corresponding to the PFC winding part, wherein the primary core and the secondary core are formed in pairs on the upper and lower portions of the tertiary core, respectively. 12. The method of claim 11,
The primary and secondary cores are formed in a 'c' shape, the tertiary core is an integral PFC transformer is formed in an 'I' shape. 12. The method of claim 11,
The bobbin has an integrated PFC transformer having a hole formed in the upper and lower surfaces.

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