KR20060015339A - A transformer having auxiliary core - Google Patents

Abstract

The present invention relates to a transformer used in an inverter, and more particularly, to protect a circuit of an inverter for driving a backlight that provides light at the rear of a liquid crystal cell of an LCD, and to block or divide magnetic flux leaking to an upper part and a lower part of a magnetic field. The present invention relates to a transformer equipped with a secondary core that increases the efficiency of the transformer by reducing the area of the transformer.

Transformer having an auxiliary core according to the present invention, a low-pressure coil and a high-pressure coil is wound on the outer peripheral surface and the hollow portion is formed inside the bobbin provided with a connecting terminal at both ends, the inner core and the coupling to the hollow portion of the bobbin and the In the transformer comprising a main core consisting of an outer core coupled to the circumference of the bobbin, the transformer further comprises a lower auxiliary core installed in a direction orthogonal to the lower central portion of the outer core.

In addition, the upper auxiliary core in the orthogonal direction to the upper central portion of the outer core is configured to further include.

The present invention configured as described above reduces the magnetic field region by dividing the magnetic flux leaking to the upper or lower portion of the transformer into the upper and lower auxiliary cores, thereby reducing the electromagnetic interference to the circuit device located at the upper or lower portion of the transformer. In addition, it improves the power loss of the transformer and removes deterioration due to heat generation, thereby bringing the effect of improving the characteristic value of the transformer.

Transformers, cores, bobbins, auxiliary cores, inverters, backlights, lamps.

Description

Transformer with auxiliary core

1 is a schematic cross-sectional view showing the magnetic flux formed in the LCD module using a transformer according to the prior art.

Figure 2 is an exploded perspective view showing a transformer with an auxiliary core according to a first embodiment of the present invention.

Figure 3 is a schematic cross-sectional view showing a split state of the magnetic flux formed in the lower portion of the transformer by the auxiliary core according to the first embodiment of the present invention.

4 and 5 are an exploded perspective view and a combined perspective view showing a transformer equipped with a secondary core according to a second embodiment of the present invention.

Figure 6 (a) (b) is a cross-sectional view showing a transformer with a secondary core according to a second embodiment of the present invention.

Figure 7 (a) (b) (c) (d) is a perspective view showing a cap core used in the second embodiment of the present invention.

8 and 9 (a) and (b) are a front view and a sectional view showing a transformer provided with auxiliary cores at the upper and lower portions according to a third embodiment of the present invention.

10 (a) (b) and 11 (a) (b) (c) are front and cross-sectional views showing yet another embodiment of a transformer with upper and lower auxiliary cores of the present invention.

Figure 12 (a) (b) is a perspective view and a cross-sectional view showing another embodiment of a transformer with a top and bottom auxiliary core of the present invention.

Figure 13 (a) (b) is a perspective view and a schematic view showing a transformer with a secondary core using a plurality of bobbins in accordance with the present invention.

*** Explanation of symbols for the main parts of the drawing ***

100: transformer 110: bobbin

120, 120 ': Main core 130: Lower sub core

131, 151: bottom plate portion 132, 152: support portion

133: 153: protruding support 140: cap core

121, 121 ', 141: outer core 122, 122', 142: inner core

150: upper auxiliary core

The present invention relates to a transformer used in an inverter, and more particularly, to protect a circuit of an inverter for driving a backlight that provides light at the rear of a liquid crystal cell of an LCD, and to block or divide magnetic flux leaking to an upper part and a lower part of a magnetic field. The present invention relates to a transformer equipped with a secondary core that increases the efficiency of the transformer by reducing the area of the transformer.

Recently, LCD monitors and LCD TVs are widely used due to the development of display devices. Since most of the displays, such as LCDs, are light-receiving devices that display images by controlling the amount of light coming from the outside, a separate device for irradiating light is used. It requires a light source, that is, a backlight unit (BLU) having a small size and high power efficiency. In addition, the inverter used in the backlight unit provides a stable driving voltage of a frequency set in the backlight assembly for providing backlight to the LCD liquid crystal cell by the transformer.

At this time, the transformer is a device for increasing or decreasing the voltage of the alternating current, and is generally manufactured by winding several wire coils around a large magnet core. And, when the coil is connected to the input circuit to change the voltage and the output circuit to which the changed (converted) voltage is used and the alternating current of the input circuit passes through the low pressure coil, the strength and direction are changed in response to the alternating current. The magnetic field is generated by the changing magnetic flux. The change in magnetic flux induces an alternating voltage in the high pressure coil and the winding ratio in each coil determines the transformer ratio.

The conventional transformer used in such an inverter consists of a combination of a bobbin on which a coil is wound and a core forming a gyro. At this time, the bobbin is formed on both sides of the bobbin body portion having a hollow portion, the low voltage terminal board and the high pressure terminal board having a low voltage terminal and a high voltage terminal, and the low pressure coil on one side of the bobbin body centered on the coil partition. Wind the high pressure coil.

In addition, the core is coupled to the bobbin to wrap the bobbin is formed by the current flowing in the coils on both sides of the core is inserted into the hollow portion of the bobbin body portion is formed of two inner core and the outer core integral with the inner core A core of a type "I" core made of a combination of "E" type cores or inserted into the hollow part and gripped by a "U" type core on top of a bobbin into which the "I" core is inserted. It consists of a transformer.

As described above, a transformer composed of a combination of a bobbin and a core is mounted on an inverter and used to convert voltage and current or change impedance. Referring to FIG. 1, a magnetic flux formed by leakage from a transformer used in a conventional LCD module is described. Looking at it as follows.

As shown in the LCD module 30, the back light unit BLU 4 for providing light to the liquid crystal LCD plate 5 is constituted by the supporting panel 3. In addition, a transformer 1 for supplying power to lamps 32 such as EL, LED, CCFL, etc. included in the backlight unit 4 is mounted on the printed circuit board 2 to configure an inverter, and the support panel 3 ) Is located behind.

In this case, the transformer 1 mounted on the printed circuit board 2 is positioned to be spaced apart from the support panel 3 made of the metal for a predetermined efficiency. However, the spaced intervals cause loss of function while improving the performance of the transformer and generating high voltage, and change the strength and direction by magnetic flux in response to the alternating current when the alternating current of the input circuit passes through the low pressure coil. In this case, the leakage magnetic flux passing through the non-gyro formed by the core affects the support panel 3 made of the metal, causing power loss of the transformer 1 and lowering the characteristic value. Occurs.

In addition, the magnetic flux leaking to the lower portion of the transformer 1 affects the support panel 3, causing electromagnetic interference (EMI), increasing the current deviation of the transformer 1, and causing deterioration.

The present invention is to solve the above problems, an object of the present invention is to provide a transformer with an auxiliary core so as to divide the magnetic flux leaking to the upper and lower portions of the transformer mounted on the printed circuit board.

In addition, an object of the present invention is to improve power loss of a transformer and to eliminate deterioration caused by heat generation.

In order to achieve the above object, the transformer according to the present invention includes a bobbin having a low pressure coil and a high pressure coil wound on an outer circumferential surface thereof, forming a hollow portion at both ends thereof, and a connecting terminal at both ends thereof, and an inner core coupled to the hollow portion of the bobbin. And a main core comprising an outer core coupled to a circumference of the bobbin, the transformer further comprising a lower auxiliary core installed in a direction perpendicular to a lower center portion of the outer core to divide the magnetic flux formed in the lower portion of the transformer. Configure it to do so.

At this time, the main core is composed of two cap cores facing each other, the cap core is an outer core consisting of both sides that can cover half of both sides of the bobbin and a vertical portion that can completely cover the front or rear of the bobbin And an inner core integrally formed with the vertical portion and having a length of half of the hollow portion.

The lower auxiliary core may include a rectangular bottom plate portion having a length longer than the width of the bobbin, and support portions protruding from both ends of the bottom plate portion to approach bottoms of both sides of the outer core.

Preferably the length of the bottom plate portion of the lower auxiliary core is configured to have the same length as the width of the main core coupled to the bobbin, the width of the bottom plate portion of the lower auxiliary core is 1/3 to 1/5 of the bobbin length Have

In addition, the thickness of the supporting portion of the lower auxiliary core is configured to be the same as the thickness of the both sides of the outer core, the support portion is configured to be spaced apart from the bottom surface of both sides of the outer core.

And, in another embodiment the main core is composed of two cap cores facing each other, the cap core can cover the top plate portion of the size that can cover half of the upper surface of the bobbin and half of both sides of the bobbin It consists of an outer core consisting of a vertical portion that can completely cover the front or rear of the bobbin, and an inner core integrally formed with the vertical portion and having a length of half of the hollow portion.

At this time, both sides of the outer core may be configured to open part or the whole.

In another embodiment, a low pressure coil and a high pressure coil are wound on an outer circumferential surface, and a hollow part is formed therein, and a bobbin provided with a connecting terminal at both ends, an inner core coupled to the hollow part of the bobbin, and a circumference of the bobbin. In a transformer comprising a main core consisting of an outer core, the transformer further comprises a lower auxiliary core installed in an orthogonal direction in the lower center portion of the outer core as well as an upper auxiliary core installed in an orthogonal direction in the upper center portion of the outer core. It is configured to divide the magnetic flux formed at the top and bottom of the transformer.

In addition, the main core is separately formed in the outer core of the main core is the same height as the inner core is coupled to the bobbin, the lower auxiliary core installed in the orthogonal direction in the lower center of the outer core, It may be configured to further include an upper auxiliary core installed in an orthogonal direction in the upper central portion.

The upper and lower auxiliary cores have rectangular bottom plate portions each having a length longer than the width of the bobbin, and both ends of the bottom plate portion so as to be close to the upper surface of both sides of the outer core and the bottom surface of both sides of the outer core, respectively. It consists of a protruding support.

Preferably, the bottom plate portion of the upper and lower auxiliary cores have a width of 1/3 to 1/5 of the bobbin length. The support part of the upper and lower auxiliary cores is configured to have a thickness equal to the thickness of both sides of the outer core, and the support parts of the upper and lower auxiliary cores are spaced apart from both upper and lower surfaces of both sides of the outer core, respectively. Configure it to be located.

In addition, the upper auxiliary core may be configured in the form of a rectangular plate having the same length as the width of the main core coupled to the bobbin, the outer core of the transformer can be fixed by inserting the upper auxiliary core in the upper central portion, if necessary. Form a seat of size

In addition, the upper and lower auxiliary cores according to the present invention may be spaced apart from each other by the size of the insulator from the top and bottom surfaces of the outer core by an insulator such as insulating tape or insulating paper.

In addition, the upper auxiliary core and the lower auxiliary core is configured to include a protruding support portion protruding in the bobbin direction on the center side of the bottom plate portion, the support portion formed at both ends of the auxiliary core bottom plate portion by the protruding support portion of the outer core It may be located spaced apart from the top or bottom.

In addition, the transformer is formed so as to neighbor two or more bobbins in parallel as necessary, the lower auxiliary core installed in a direction orthogonal to the lower central portion of the outer core coupled to the adjacent bobbin, and the upper central portion of the outer core It further comprises an upper auxiliary core installed in an orthogonal direction.

In addition, the transformer is formed by integrally adjacent two or more bobbins in series as needed, a plurality of lower auxiliary cores orthogonally installed on the lower side of the outer core coupled to the bobbin, and on the upper side of the outer core It further comprises a plurality of upper auxiliary cores installed in an orthogonal direction.

In this case, the upper auxiliary core is located at the upper center portion of the outer core portion surrounding the one bobbin, the lower auxiliary core is located at the lower side of the outer core portion surrounding half of the one bobbin, each of the upper and lower parts Auxiliary cores are formed in the transformer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is an exploded perspective view showing a transformer with a secondary core according to a first embodiment of the present invention, Figure 3 is a magnetic flux formed as a lower portion of the transformer by the secondary core according to the first embodiment of the present invention A schematic cross section showing the appearance.

As shown, the transformer structure 100 according to the first embodiment of the present invention is the main coil 120 and the outer core surrounding the bobbin 110 and the bobbin winding the low pressure coil and the high pressure coil is wound around the It is made of a combination of the lower auxiliary core 130 is coupled to the lower portion of the bobbin.

At this time, the bobbin 110 forms a low voltage terminal board 112a and a high voltage terminal board 112b having the low voltage terminal 111a and the high voltage terminal 111b on both sides, and between the terminal substrates 112a and 112b. The bobbin body portion 118 having the hollow portion 113 formed therein so as to be able to insert the "E" type core, ie, the main core 120, of the same width as the horizontal lengths of the terminal substrates 112a and 112b in both directions. ) And a plurality of coil partitions 116 and the high pressure coil windings 115 that divide the outer circumferential surface of the bobbin body 118 into a low pressure coil winding 114 and a high pressure coil winding 115. It consists of two slits (117).

In addition, the main core 120 is composed of two cap cores facing each other, the cap core and the inner core 122 and the inner core 122 is inserted into the hollow portion 113 of the bobbin 110 and It is integrally formed with an outer core 121 surrounding the side surface of the bobbin and has an "E" shape to couple to both sides of the bobbin 110.

In other words, the cap core having the shape of the “E” shape, that is, the main core 120 may have both sides which may cover half of both sides of the bobbin 110 and a vertical portion which may completely cover the front or rear surface of the bobbin. It consists of an outer core 121 made of a portion, and an inner core 122 integrally formed with the vertical portion and having a length of half of the hollow portion 113.

At this time, the main core 120 is inserted into the "U" type core in the upper portion of the "I" core and the bobbin inserted "I" core tightly inserted into the hollow portion 113 as another form. The transformer can be configured by mounting in a gripping manner.

In addition, the lower auxiliary core 130 is orthogonal to the bobbin so as to surround the lower central portion of the bobbin body 118 so as to divide the leakage magnetic flux formed in the lower portion to minimize the influence of the magnetic field on the lower portion of the transformer 100. Is installed and configured as, the bottom plate portion 131 having a length that may include the width of the bobbin body portion 118 of the bobbin 110, the support portion 132 protruding at both ends of the bottom plate portion 131 ) Is preferably configured to have a "C" shape.

The lower auxiliary core 130 configured as described above is positioned in the orthogonal direction by wrapping the lower center portion of the bobbin body 118 in the transformer 100 in which the low pressure coil and the high pressure coil are wound and fixed to the transformer 100 in an insulating taping process. As a result, the lower core of the outer core 122 is located in an orthogonal direction.

At this time, the support portion 132 protrudes to partially wrap the side surface of the bobbin body portion 118 so that the lower auxiliary core 130 does not shake in both directions during insulating taping, and an end portion of the support portion 132 It is formed so as to be close to the bottom of the outer core 121 is preferably spaced apart from the bottom of the outer core 121 to minimize the effect of the secondary core on the main core (120).

In addition, the support portion 132 of the lower auxiliary core 130 is preferably configured to have the same thickness as the thickness of both sides of the outer core 121.

And, the length of the bottom plate portion 131 of the lower auxiliary core preferably has the same length as the width of the main core 120 coupled to the bobbin.

In addition, the lower auxiliary core 130 is configured to facilitate the division of the magnetic flux leaking to the lower portion of the transformer by using a ferrite material different from the ferrite material forming the main core as necessary.

Referring to FIG. 3, the transformer 100 forms a flow path flowing from the main core 120 to the main core 120 by a low pressure coil wound on the bobbin 110 and a current flowing in the high pressure coil, and moves upward and downward. Magnetic fields A and B, that is, electric fields are formed by the leaked magnetic flux.

In this case, the lower auxiliary core 130 divides the magnetic flux leaking into the lower portion of the transformer 100 to reduce the magnetic field region B, that is, the magnetic field. Accordingly, in the LCD module 30 using the transformer 100, the effect of magnetic flux is minimized to shield the electromagnetic interference and to reduce the current deviation at the output of the transformer.

4 and 5 are an exploded perspective view and a combined perspective view showing a transformer with an auxiliary core according to a second embodiment of the present invention, Figure 6 (a) (b) is an auxiliary core according to a second embodiment of the present invention Sectional view showing a transformer with.

As shown, the transformer 100 according to the second embodiment of the present invention is composed of a bobbin 110 and a main core. At this time, the main core is composed of a lower auxiliary core 130 coupled to the lower portion of the transformer 100 and two cap cores 140 of a size capable of covering the upper portion of the bobbin.

In general, when installing a module device affected by the magnetic flux in the upper portion of the transformer 100 is installed so as to be spaced apart by a predetermined interval so that the device is not affected by the leakage magnetic flux. The cap core 140 forms a magnetic path to the upper portion of the transformer 100 and blocks the magnetic flux that leaks so as to facilitate the installation of the device by reducing such spaced intervals.

At this time, the cap core 140 has both sides of the upper plate portion 141a having a size that can cover half of the upper surface of the bobbin body portion 118 and half of both sides of the bobbin body portion 118. An outer core 141 made up of a vertical portion 141c that covers a portion 141b and the hollow portion 113 of the bobbin body portion 118 and covers the front surface of the bobbin 110, and the vertical portion An inner core integrally with 141c and protruding in the same direction as the side portions 141b so as to be tightly coupled to the hollow portion 113 of the bobbin body portion 118 and having a half length of the hollow portion 113 length. 142 is formed in one piece.

The two cap cores 140 configured as described above are coupled while the inner core 142 is inserted into both sides of the bobbin 110 to block the front and rear surfaces of the bobbin by the vertical portion 141c, and the upper plate portion 141a. By blocking the magnetic flux leaking to the upper portion of the bobbin 110 by.

The lower auxiliary core 130 includes a bottom plate portion 131 having a length equal to the width of the cap core 140 and a support portion 132 protruding from both ends thereof, and the bobbin body of the bobbin 110. The lower central portion of the portion 118 is partially wrapped and is installed in the orthogonal direction at the lower central portion of the outer core of the cap core 140.

Preferably, the lower auxiliary core 130 is formed so that the width of the bottom plate 131 has a size of 1/3 to 1/5 of the length of the bobbin 110, the bobbin body portion wound high-pressure coil ( The high-pressure coil winding 115 of the 118 is positioned so as not to be included as much as possible, so as to prevent the lower auxiliary core 130 from being burned out by the high pressure current induced in the low pressure coil and the high pressure coil.

Referring to the shape of the lower auxiliary core 130 with reference to the cross-sectional view of Figure 6 (a) (b) as follows.

Referring to FIG. 6 (a), the lower auxiliary core 130 is disposed under the bobbin 110 to divide the magnetic flux formed under the main core and minimize the magnetic field region formed by the magnetic flux. In addition, the support part 132 of the lower auxiliary core 130 protrudes from the side surface of the bobbin body 118 and is preferably positioned to be spaced apart from the bottom of both sides 141c of the cap core 140 by a predetermined distance (a). It has the same thickness as the thickness of both sides of the cap core 140, the length of the bottom plate portion 131 preferably has the same length as the width of the cap core 140.

At this time, the gap (a) formed by the support part 132 and the cap core 140 is in contact with the lower auxiliary core 130 and the cap core 140, the cap core 140 by the lower auxiliary core 130. In order to prevent interference) and the characteristic value and efficiency of the original transformer 100 from falling off.

In addition, referring to FIG. 6 (b), the lower auxiliary core 130 is spaced apart from the bottom of the cap core 140 on both sides 141c according to the size and shape of the bobbin 110. Protruding support portion 133 protruding in the bobbin direction is formed on the central side of the bottom plate portion 131 as necessary to maintain the spacing (a).

7 (a) (b) (c) (d) are perspective views showing an upper cap core used in the second embodiment of the present invention. As shown, the cap core 140 has a variety of structures to facilitate coupling with the bobbin 110.

Figure 7 (a) is formed so that the inner core and the front surface of both sides of the cap core has the same line, Figure 7 (b) is a shape in which both sides of the cap core is partially opened, Figure 7 (c) is a bobbin The inner core is formed in the same line as the bottom surface of both sides according to the shape. In addition, Figure 7 (d) is to open both sides of the cap core to facilitate the manufacture of the core.

8 and 9 (a) and (b) are a front view and a cross-sectional view showing a transformer provided with auxiliary cores at upper and lower portions according to a third embodiment of the present invention.

As shown, the transformer 100 according to the third embodiment is a bobbin 110 wound around a low pressure coil and a high pressure coil, an outer core 121 and a bobbin that wrap around the side surface of the bobbin 110 and engage around the bobbin 110. It consists of a combination of the main core 120 consisting of the inner core 122 is inserted into the hollow portion 113 of the lower auxiliary core 130 is installed so as to divide the magnetic flux formed in the lower, The lower auxiliary core 130 and the upper auxiliary core 150 in an orthogonal direction above the corresponding transformer 100 is configured to further include.

The transformer 100 divides the magnetic flux leaking not only in the lower part but also in the upper part by the upper auxiliary core 150 installed as described above, so that a magnetic field in which components of neighboring devices are leaked by the transformer 100 is formed. Not be affected by

Accordingly, the upper auxiliary core 150 is installed in an orthogonal direction on the upper center of the outer core 121 of the main core and is taped by an insulating tape or the like to be fixed to the transformer 100. In this case, the upper auxiliary core 150 is positioned to be spaced apart from the upper surface of the outer core 121 by a predetermined distance (a '), and an insulator such as insulating tape or insulating paper is used if necessary.

As shown in FIG. 9A, the upper auxiliary core 150 has the same shape as the lower auxiliary core 130 and has a length longer than the width of the bobbin 110. It consists of a rectangular bottom plate 151 having a length equal to the width of the support plate 152 protruding from both ends of the bottom plate 151.

At this time, the support part 132 of the lower auxiliary core 130 and the support part 152 of the upper auxiliary core 150 preferably have the same thickness as the thickness of both sides of the outer core 121, each of the outer core The upper and lower surfaces of both sides of 121 are spaced apart from each other by a predetermined distance (a, a ').

In addition, referring to Figure 9 (b) the upper auxiliary core 150 is bobbin on the central side of the bottom plate portion 151 as necessary to maintain a distance (a ') spaced apart from the upper surface of the outer core 121. It further comprises a protruding support portion 153 protruding in the direction.

10 (a) (b) and 11 (a) (b) are a plan view and a cross-sectional view showing another embodiment of a transformer with upper and lower auxiliary cores according to the third embodiment of the present invention.

As shown, the upper auxiliary core 150a has a rectangular plate shape and has a width equal to the width of the transformer 100 in which the bobbin 110 and the main core 120 are coupled, that is, the width of the main core 120. The upper auxiliary core 150a has a width of 1/3 to 1/5 of the bobbin 110.

At this time, the upper auxiliary core 150a having a rectangular plate shape is spaced apart from the upper surface of the outer core 121 by an insulator such as insulating tape or insulating paper, and is spaced apart and fixed by a process such as insulating taping. Configure to

In addition, as needed so that it can be stably fixed without shaking during the taping process or use, the upper auxiliary core 150a positioned above the transformer 100 has an upper side of the outer core 121 at both ends of which surrounds the side surface of the bobbin. It is fitted to the seating portion 123 formed in the center portion is located in the upper center portion of the outer core.

In addition, the seating part 123 may be formed such that the upper auxiliary core 150a may be positioned in an orthogonal direction at an upper center portion of the outer core 121, and may have a size to which the upper auxiliary core 150a may be fitted and fixed. Have

10 (b) is a diagram showing a transformer excluding the main core, the upper auxiliary core 150a is disposed so as not to protrude upward from the outer core of the main core as much as possible when the upper auxiliary core 150a is located in the main core. The upper auxiliary core 150a is positioned between the neighboring coil partition 116 and the slit 117 by removing a part or the whole of the upper slit 117 of the bobbin body portion in which the core 150a is located.

In this case, the lower subsidiary core 130a may be configured in the same plate shape as the upper subsidiary core 150a and is positioned between the neighboring coil partition 116 and the slit 117 under the bobbin body.

Therefore, referring to FIG. 11A, the upper auxiliary core 150a is fitted to the seating portion 123 formed in the outer core 121 and divides the magnetic flux leaking into the upper portion of the transformer 100. In addition, referring to Figure 11 (b) the length of the upper auxiliary core 150a is longer than the width of the bobbin and less than the width of the main core coupled to the bobbin, the seating portion 123 is the upper auxiliary The core 150a is formed on the inner side of the outer core 121, that is, on the bobbin side of the outer core 121 so that the core 150a may be inserted into the outer core 121.

And, referring to Figure 11 (c) the length of the upper auxiliary core (150a) has the same length as the width of the bobbin 110 is sandwiched between the outer core 121 of the main core coupled to the bobbin of the bobbin It is located on the upper side.

In addition, as shown in FIGS. 11A and 11B, the upper auxiliary core 150a may have an insulating tape on the seating portion 123 to maintain a distance a 'from the outer core 121 as necessary. Alternatively, an insulator 124 such as insulating paper is inserted.

Figure 12 (a) (b) is a perspective view and a cross-sectional view showing another embodiment of a transformer equipped with the upper and lower auxiliary core of the present invention.

As shown in the figure, in the transformer 100 in which the upper auxiliary core 150 and the lower auxiliary core 130 are installed, the bobbin according to another embodiment may be installed to facilitate the installation of the upper and lower auxiliary cores 150 and 130. The shape of the main core 120 ′ coupled to 110 may be changed.

At this time, the main core (120 ') is wrapped around the side of the bobbin 110 wound around the low-pressure coil and high-pressure coil (121') and the inner core is inserted into the hollow portion 113 of the bobbin and coupled to the circumference ( 122 '), the outer core 121' of the main core 120 'is formed at the same height as the inner core 122' and coupled to the bobbin.

Therefore, the main core 120 'is composed of two "E" type cores having the same height, and when coupled to the bobbin, the upper side of the bobbin body portion 118 is partially opened. In addition, the upper auxiliary core 150 surrounds the bobbin body 118 and is orthogonal to the upper center portion of the outer core 122 ′, and the lower auxiliary core 130 is the bobbin body 118. Wrapping is located in the orthogonal direction to the lower central portion of the outer core (122 ').

Referring to FIG. 12B, the outer core 121 ′ having the same height as the height of the inner core 122 ′ is coupled to the bobbin 110 wound with a coil, and the upper auxiliary core 150 is A portion of the side surface of the bobbin is disposed while being spaced apart from the upper surface of the outer core 121 'by a predetermined distance (a'). In addition, the lower auxiliary core 130 partially surrounds the side surface of the bobbin and is spaced apart from the bottom of the outer core 121 ′ by a predetermined distance (a).

In addition, the support part 152 of the upper auxiliary core 150 and the support part 132 of the lower auxiliary core 130 have the same thickness as both side thicknesses of the outer core 122 ′.

The transformer including the upper auxiliary core and the lower auxiliary core formed as described above includes an inner core 122 and 122 'inserted into the hollow portion of the bobbin body and an outer core 121 integral with the inner core 122 and 122'. 121 ') as well as two "E" type main cores 120 and 120' as well as a straight "I" core inserted tightly into the hollow and an upper portion of the bobbin into which the "I" core is inserted. The main core of the type | mold which grips a "U" type core can be used.

The upper auxiliary cores 150 and 150a and the lower auxiliary cores 130 and 130a according to the present invention reduce magnetic field regions by dividing the magnetic flux leaking to the upper and lower portions of the transformer, wherein the transformer is parallel or not only a single bobbin. A plurality of bobbins can be configured in series, and the upper and lower auxiliary cores can be applied to a transformer using the plurality of bobbins.

Figure 13 (a) (b) is a perspective view and a schematic view showing a transformer with a secondary core using a plurality of bobbin according to the present invention, referring to Figure 13 (a), the two bobbin 110 located in parallel And an upper auxiliary core in an orthogonal direction at an upper center portion of the outer core 121 of the main core 120 surrounding the two bobbins, at an upper portion of the transformer formed by a combination of the main core 120 surrounding the side of the bobbin 110. It further comprises a 150, and further comprises a lower auxiliary core 130 in the orthogonal direction to the lower central portion of the outer core 121.

In addition, referring to Figure 13 (b), by combining the bobbin (110 ') and the main core (not shown) surrounding the side surface of the bobbin 110' is formed in two series bobbins integrally located in series. The transformer further comprises a plurality of upper auxiliary cores 150 in an orthogonal direction on the upper side of the outer core, and further comprises a plurality of lower auxiliary cores 130 in the orthogonal direction on the lower side of the outer core. .

At this time, the bobbin 110 ′ forms a high pressure coil winding unit 115 and a low pressure coil winding unit 114 on one side of one bobbin, that is, an integrally formed bobbin, and the low pressure coil winding on the other side of the bobbin. The low pressure coil and the high pressure coil are wound by forming the part 114 and the high pressure coil winding part 115.

In addition, the upper auxiliary core 150 forms one at the upper center portion of the outer core portion surrounding one bobbin forming the low pressure coil winding 114 and the high pressure coil winding 115 on one side and the other. The upper central core portion of the outer core portion surrounding the bobbin is configured another one, and preferably two upper auxiliary cores 150 are configured in the transformer.

In addition, the lower sub-cores 130 are configured at a position corresponding to the upper sub-cores 150, one at a lower side of the outer core, and two lower sub-cores 130 are configured in the transformer.

The upper and lower auxiliary cores 150 and 130 formed as shown in FIG. 13 (a) (b) may have a length that may include the entire width of the neighboring bobbins 110 and 110 ', preferably an outer core. It has the same length as the width. In addition, the upper and lower auxiliary cores 150 and 130 have a width of 1/3 to 1/5 of the length of the bobbin 110.

As such, the low pressure coil and the lower auxiliary core are included in the lower portion of the transformer in which the high pressure coil is wound, and the upper auxiliary core is formed in the upper portion to block or split the magnetic flux formed in the upper or lower portion of the transformer.

The present invention described above is limited to the above-described embodiment and the accompanying drawings as various substitutions and modifications can be made within a range without departing from the technical spirit of the present invention for those skilled in the art. It doesn't happen.

The transformer with the auxiliary core of the present invention made as described above reduces the magnetic field region formed by the magnetic flux leaking by dividing the magnetic flux formed on the upper or lower portion of the transformer with the auxiliary core and reduces the electromagnetic interference for neighboring devices. Reduce and eliminate the deterioration of heat generation.

In addition, an increase in core cross-sectional area by the cap core improves the power loss of the transformer.

Claims (19)

Winding the low pressure coil and the high pressure coil on the outer circumferential surface and forming a hollow portion therein, a bobbin provided with connecting terminals at both ends, an inner core coupled to the hollow portion of the bobbin and an outer core coupled around the bobbin In the transformer comprising: And a lower auxiliary core installed in an orthogonal direction at a lower center portion of the outer core to divide the magnetic flux formed in the lower portion of the transformer. The method of claim 1, The main core is composed of two cap cores facing each other, The cap core has an outer core formed of both side portions that can cover half of both sides of the bobbin and a vertical portion that can completely cover the front or rear surface of the bobbin, and formed integrally with the vertical portion and have a length of half of the hollow portion. Transformer having an auxiliary core, characterized in that consisting of an inner core having. The method according to claim 1 and 2, The lower auxiliary core includes a rectangular bottom plate portion having a length longer than the width of the bobbin and a support portion protruding from both ends of the bottom plate portion so as to approach the bottom surface of both sides of the outer core. Equipped transformer. The method of claim 3, wherein A width of the bottom plate of the lower auxiliary core transformer is provided with a secondary core, characterized in that 1/3 to 1/5 of the bobbin length. The method of claim 3, wherein The length of the bottom plate portion of the lower auxiliary core transformer having a secondary core, characterized in that the same length as the width of the main core coupled to the bobbin. The method of claim 3, wherein The thickness of the supporting portion of the lower auxiliary core is the same as the thickness of the both sides of the outer core, the supporting portion transformer with an auxiliary core, characterized in that located apart from the bottom surface of both sides of the outer core. The method according to claim 1 or 2, The main core is composed of two cap cores facing each other, The cap core is an outer core consisting of a top plate having a size that can cover half of the upper surface of the bobbin, both sides that can cover half of both sides of the bobbin and a vertical portion that can completely cover the front or rear of the bobbin, and A transformer with an auxiliary core formed integrally with the vertical portion and having an inner core having a length of half of the hollow portion. The method of claim 7, wherein Transformer with an auxiliary core, characterized in that both sides of the outer core is open. Winding the low pressure coil and the high pressure coil on the outer circumferential surface and forming a hollow portion therein, a bobbin provided with connecting terminals at both ends, an inner core coupled to the hollow portion of the bobbin and an outer core coupled around the bobbin In the transformer comprising: A lower auxiliary core installed in an orthogonal direction at a lower center portion of the outer core; And an upper auxiliary core installed in an orthogonal direction at an upper center portion of the outer core to divide the magnetic fluxes formed on the upper and lower portions of the transformer. Winding the low pressure coil and the high pressure coil on the outer circumferential surface and forming a hollow portion therein, a bobbin provided with connecting terminals at both ends, an inner core coupled to the hollow portion of the bobbin, and an outer core coupled around the bobbin. In the transformer containing, An outer core of the main core is formed to have the same height as the inner core and is coupled to the bobbin; A lower auxiliary core installed in an orthogonal direction at a lower center portion of the outer core; And an upper auxiliary core installed in an orthogonal direction at an upper center portion of the outer core to divide the magnetic fluxes formed on the upper and lower portions of the transformer. The method according to claim 9 or 10, The upper and lower auxiliary cores are rectangular bottom plate portions having a length longer than the width of the bobbin, and support portions protruding from both end portions of the bottom plate portion so as to be close to upper surfaces of both sides of the outer core and lower surfaces of both sides of the outer core, respectively. Transformer equipped with an auxiliary core, characterized in that made. The method of claim 11, The bottom plate portion of the upper and lower auxiliary cores has a width of 1/3 to 1/5 of the bobbin length, and the support portion of the upper and lower auxiliary cores is configured such that the thickness of the upper and lower auxiliary cores is equal to the thickness of both sides of the outer core. A transformer with an auxiliary core, characterized in that it is spaced apart from the upper surface and the bottom surface of both sides of the outer core. The method of claim 9, The upper auxiliary core is a transformer with an auxiliary core, characterized in that the rectangular plate shape having the same length as the width of the main core coupled to the bobbin. The method according to claim 9 or 13, The outer core has a transformer having an auxiliary core, characterized in that the upper central portion is formed in the seating portion of the size that can be fixed to the upper auxiliary core. The method according to any one of claims 1, 6, 9, 10 and 11, The upper and lower auxiliary cores are transformers having auxiliary cores, wherein the upper and lower auxiliary cores are positioned to be spaced apart from the top and bottom surfaces of the outer core by an insulator such as insulating tape or insulating paper. The method according to claim 9 or 10, The upper auxiliary core and the lower auxiliary core transformer is provided with an auxiliary core, characterized in that it comprises a protruding support projecting in the bobbin direction on the central side of the bottom plate portion. Winding the low pressure coil and the high pressure coil on the outer circumferential surface and forming a hollow portion therein, a bobbin provided with connecting terminals at both ends, an inner core coupled to the hollow portion of the bobbin, and an outer core coupled around the bobbin. In the transformer comprising: The bobbins are formed to neighbor two or more in parallel; A lower auxiliary core installed in a direction orthogonal to a lower center portion of the outer core coupled to the adjacent bobbin; And an upper auxiliary core installed in an orthogonal direction at an upper center portion of the outer core to divide the magnetic fluxes formed on the upper and lower portions of the transformer. Winding the low pressure coil and the high pressure coil on the outer circumferential surface and forming a hollow portion therein, a bobbin provided with connecting terminals at both ends, an inner core coupled to the hollow portion of the bobbin and an outer core coupled around the bobbin In the transformer comprising: The bobbins are integrally formed with two or more adjacent in series; A plurality of lower auxiliary cores installed in an orthogonal direction under the outer core coupled to the bobbin; And a plurality of upper auxiliary cores installed in an orthogonal direction on the upper side of the outer core to divide the magnetic fluxes formed on the upper and lower portions of the transformer. The method of claim 18, The upper auxiliary core is located in the upper center portion of the outer core portion surrounding the one bobbin, the lower auxiliary core is located in the lower center portion of the outer coil portion surrounding the one bobbin, each of the two upper and lower auxiliary cores Transformer with an auxiliary core, characterized in that formed on the upper and lower side of the outer coil.

Images