KR100909396B1 - Flux Noise Shielding Transformer for Inverter - Google Patents

Abstract

The present invention relates to an inverter flux noise shielding transformer capable of shielding flux noise caused by leakage magnetic flux to prevent deterioration of operating characteristics of a peripheral circuit. The coil winding part 110 and the second coil winding part 120 in which the plurality of slits 121 are formed are divided, and terminal board parts 140 having coil terminals 150 at both ends thereof are integrally formed and both sides are formed. A bobbin 100 having a hollow portion 102 penetrating in the longitudinal direction between the terminal substrate portions 140 of the terminal board 140, a magnetic core inserted into the hollow portion 102 of the bobbin 100, and the magnetic core; In an inverter transformer comprising a first coil and a second coil wound around the first coil winding 110 and the second coil winding 120 so as to form a magnetic flux in the magnetic core 200, Due to time-varying currents applied to the first and second coils, The magnetic flux is inserted into the hollow portion 102 to form the first closed loop Lp1 upward from the hollow portion 102 and also to form the second closed loop Lp2 downward from the hollow portion 102. And the cross section in the longitudinal direction to cover the upper side and the lower side and the front side and the rear side of the bobbin 100 is characterized in that the '曰' shape. According to the configuration as described above, there is an advantage that can shield the flux noise.

Description

A Transformer Shielding Flux Noise for Inverter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flux noise shielding transformer for inverters. In particular, the magnetic flux induced by the application of time-varying current forms a closed loop in the upper space and the lower space of the bobbin, respectively, thereby minimizing leakage flux and leakage. The present invention relates to an inverter flux noise shielding transformer suitable for shielding flux noise generated by magnetic flux so as to prevent deterioration of operating characteristics of a peripheral circuit.

Recently, with the development of display devices, LCD monitors and LCD TVs are widely used. LCDs have fluorescent tubes driven at high voltages for a back light system, typically an inverter with a drive circuit is used to drive the fluorescent tube and the inverter has a high voltage transformer. Therefore, the transformer used to minimize the size needs to have a thin plate type structure.

A transformer is a device that increases or decreases the voltage of an alternating current. In general, the primary and secondary coils on the low pressure side and the high pressure side have a core around a bobbin in which a core is inserted into a hollow portion of a bobbin. It is made by winding. One low voltage coil called the primary coil is connected to the input circuit to change the voltage, and the other high voltage coil called the secondary coil is connected to the output circuit using the changed (converted) voltage. When the light passes through the primary coil, a magnetic field is generated in which intensity and direction change in response to the AC current. The change in magnetic flux induces an alternating voltage in the secondary coil and the winding ratio in each coil determines the transformer ratio.

In the case of such a thin plate type high voltage transformer, the number of windings of the high voltage coil is much larger than that of the low voltage coil, so the current flowing in the high voltage coil is very small compared to the current flowing in the low voltage coil. Much thinner than low pressure coils. In addition, in order to facilitate the dissipation of heat generated from the coil and to divide the high voltage, the high-voltage coil winding part of the bobbin is wound with one continuous coil separated by a plurality of slits, thereby winding both ends of the coil.端) must be spaced to some extent, and in connecting the coil to the high voltage terminal of the transformer formed on one side of the bobbin, one end of the coil is connected to the high voltage by the lead wire extending from the first end of the coil. It is connected to one terminal of the terminal. At this time, the leader line is spaced apart from the high voltage coil by a length of the terminal board to prevent a short circuit with a part of the high voltage coil.

The inverter transformer according to the related art will be described with reference to FIGS. 1 and 2 as follows.

As shown in FIG. 1, the conventional transformer 1 has a low voltage terminal board 13 and a high voltage terminal board 11 having a low voltage coil terminal 14 and a high voltage coil terminal 12 on both sides. And a bobbin body having a core insertion hollow portion 17 formed therebetween so as to insert the "E" type core 5 having the same width as the horizontal length of the terminal board in both directions between the terminal boards 11 and 13. And a plurality of slits for dividing the outer circumferential surface of the bobbin body portion into a low pressure coil winding portion 19 and a high pressure coil winding portion 18 and a plurality of slits that divide the high pressure coil winding portion 18 at regular intervals ( The combination of the bobbin 10 consisting of 16 and the core core inserted into the core insertion hollow portion 17 of the bobbin 10 and the "E" type core 5 formed of the outer core integral with the core core. Is done.

In the transformer 1 configured as described above, a coil wound around the low voltage coil winding 19 and the high voltage coil winding 18 is connected to a terminal provided on the low voltage terminal board 13 and the high voltage terminal board 11. It is connected and electrically connected to other circuits around.

Accordingly, induction current flows by magnetic induction to the coil wound on the high voltage coil winding part 18 by the change of the current flowing in the coil wound on the low voltage coil winding part 19, and the coil wound on each terminal board A voltage is formed that is proportional to the turns ratio.

As described above, it can be seen that the direction of the magnetic force lines formed through the E-shaped core 5 is dualized in the vertical direction and the horizontal direction. In the implementation of the backlight unit for the LCD TV or LCD monitor, the magnetic field lines in the horizontal direction Is a loss, and furthermore, the horizontal magnetic field formed around the transformer may generate unnecessary inductive currents through other peripheral components (eg, a grounding iron plate and a heat sinking iron plate).

This has caused a problem that acts as a factor for generating unnecessary power consumption and heat generation.

The proposed technology to solve the above problems is shown in FIG. 2 as a 'core structure for transformers using bobbin' filed by the applicant of the present invention as a patent 2006-50694.

Briefly describing the technique of the patent 2006-50694, as shown in Figure 2, the transformer is a low-voltage terminal board 13 having a low-voltage coil terminal (not shown) and a high-voltage coil terminal (not shown) on both sides and a high pressure Core inserting hollow portion 17 to form a terminal board 11 integrally and to insert a "I" type core 5I having a predetermined length and width into the space between the terminal boards 11 and 13 in both directions. A bobbin body portion formed with a constant diameter, and a coil partition (not given a reference number) and a high pressure coil winding portion 18 which divide the outer circumferential surface of the bobbin body portion into a low pressure coil winding portion 19 and a high pressure coil winding portion 18. The bobbin corresponding to the bobbin 10 composed of a plurality of slits divided by intervals (not given a reference number) and the "I" shaped core 5I inserted into the core insertion hollow 17 of the bobbin 10. It consists of "C" shaped core 5C of the shape which covers 10 in the longitudinal direction.

However, the inverter transformer according to the prior art as described above has the following problems.

In the prior art, leakage magnetic flux occurred in the lower portion opposite to the "C" shaped core 5C among the magnetic fluxes formed in the "I" shaped core 5I.

As such, when leakage magnetic flux generated below the “I” -shaped core 5I occurs, a coupling coefficient between the primary side and the secondary side is lowered and a voltage that is induced from the primary side to the secondary side drops. do.

In addition, when leakage magnetic flux generated below the " I " shape core 5I occurs, the leakage magnetic flux acts as flux noise to the peripheral elements of the inverter circuit of the transformer, thereby causing malfunction or operation characteristics of the circuit element. Caused deterioration.

The present invention was created to solve the problems of the prior art as described above. The purpose of the flux noise shielding transformer for inverters according to the present invention is that the magnetic flux induced by the application of time-varying current is respectively directed to the upper space and the lower space of the bobbin. By forming a closed loop, it is possible to minimize the leakage magnetic flux and to shield the flux noise generated by the leakage magnetic flux so as to be suitable for preventing malfunctions and deterioration of the peripheral circuits. To provide a transformer.

Inverter flux noise shielding transformer of the present invention for achieving the above object is divided into a first coil winding portion and a second coil winding portion formed with a plurality of slits around the coil partition wall, each having a coil terminal at both ends thereof. The terminal board portion is formed integrally and penetrates in the longitudinal direction between the terminal board portions on both sides to have a hollow portion, a magnetic core inserted into the hollow portion of the bobbin, and magnetic flux to the magnetic core. In an inverter transformer comprising a first coil and a second coil wound around the first coil winding part and the second coil winding part so as to form a flux, the magnetic core includes the first coil and the second coil. So that the magnetic flux induced by the time-varying current applied to the first closed loop from the hollow portion to the upper side and the second closed loop from the hollow portion to the lower side, Group is characterized in that inserted into the hollow portion and the upper and lower sides and the front end face of the longitudinal direction so as to each cover the rear side of the bobbin, the characters '曰' shape.

In the flux flux shielding transformer for inverters according to the present invention, the magnetic core includes a first inserting portion inserted into the hollow portion at one inlet of the hollow portion, and a part of the upper side and the lower side of the bobbin parallel to the first inserting portion. The first upper cover and the first lower cover to cover each cover and the first connecting portion for connecting the first upper cover, the first lower cover and the first inserting portion is a cross-section in the longitudinal direction of the 'E' shape A second insertion portion inserted into the hollow portion at the other inlet portion of the hollow portion and in contact with the tip portion of the first insertion portion so as to form a closed loop in contact with the first partial core and the tip portion of the first partial core; A second upper cover and a second lower cover which partially cover an upper side and a lower side of the bobbin so as to be parallel to an insertion part and to contact the ends of the first upper cover and the first lower cover, respectively, and the second upper cover , 2nd lower cover It is characterized by consisting of a second partial core consisting of a second connection portion connecting the dog and the second insertion portion in the longitudinal direction of the 'E' shape.

The flux flux shielding transformer for inverters according to the present invention includes an insertion portion through which the magnetic core is inserted through the hollow portion, and an upper side and a lower side of the first coil winding portion and the second coil winding portion in parallel with the insertion portion. It is composed of an upper cover and a lower cover which covers and covers each of the transverse sections, and consists of a core body having a cross section in the longitudinal direction of the 'E' shape and a vertical connection portion which vertically connects the top end of the upper cover, the lower cover and the insert. It is done.

The flux noise shielding transformer for inverters of the present invention having the above configuration has the following effects.

First, the magnetic flux induced by the application of time-varying current forms a closed loop in the upper space and the lower space of the bobbin, respectively, thereby minimizing the leakage magnetic flux.

Second, by minimizing the leakage magnetic flux as described above, it is possible to shield the flux noise generated by the leakage magnetic flux to prevent the malfunction of the peripheral circuit and deterioration of the operating characteristics.

The following describes in detail with reference to the accompanying drawings a preferred embodiment of the flux noise shielding transformer for inverters of the present invention.

FIG. 3 is a perspective view of an inverter flux noise shielding transformer according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view of a length of the inverter flux noise shielding transformer according to an embodiment of the present invention. 5 is a front view of the magnetic core in FIG. 3, and FIG. 6 is an exploded perspective view of FIG. 3.

As shown in FIGS. 3 to 6, the flux noise shielding transformer A for inverters according to an embodiment of the present invention includes a first coil winding unit 110 and a plurality of slits around the coil partition 130. (121) is divided into the protruding second coil winding portion 120, the terminal board portion 140 having a coil terminal 150 at each end thereof is formed integrally and between the terminal board portion 140 of both sides A bobbin 100 having a hollow portion 102 having a predetermined length and a width Wo therein, and a magnetic core 200 inserted into the hollow portion 102 of the bobbin 100. Inverter composed of a first coil (not shown) and a second coil (not shown) respectively wound around the first coil winding 110 and the second coil winding 120 to form magnetic flux in the magnetic core. In a flux noise shielding transformer, the magnetic core 200 is caused by a time-varying current applied to the first coil and the second coil. The hollow portion 102 such that the induced magnetic flux forms a first closed loop Lp1 upward from the hollow portion 102 and also forms a second closed loop Lp2 downward from the hollow portion 102. Inserted into the and to cover the upper side and the lower side and the front side and the rear side of the bobbin 100, the longitudinal section corresponding to the width of the hollow portion 102 and the longitudinal section is characterized in that the '曰' shape.

The magnetic core 200 may include a first inserting portion 212 inserted into the hollow portion 102 at one inlet of the hollow portion 102 and the bobbin 100 in parallel with the first inserting portion 212. The first upper cover 211 and the first lower cover 213 and the first upper cover 211, the first lower cover 213 and the first insertion part which partially cover the upper and lower portions of The first connection part 214 connecting the 212, the longitudinal cross-section of the first partial core 210 having an 'E' shape, and the closed loop in contact with the tip of the first partial core 210 A second insertion portion 222 inserted into the hollow portion 102 at the other inlet of the hollow portion 102 to be in contact with the tip of the first insertion portion 212, and the second insertion portion 222. And a second upper cover 221 partially covering the upper side and the lower side of the bobbin 100 so as to be parallel to each other and in contact with the front ends of the first upper cover 211 and the first lower cover 213, respectively. The second lower cover 223 and The second upper cover 221, the second lower cover 223 and the second connecting portion 224 for connecting the second insertion portion 222 is composed of a second cross-section in the longitudinal direction of the 'E' shape It is characterized by consisting of a partial core (220).

By the configuration of the magnetic core 200 as described above, when time-varying current is applied to the primary coil, the first inserting portion 212 and the first connecting portion 214, the first upper cover 211 and the second upper cover ( The magnetic flux of the closed loop Lp1 is generated in the closed magnetic core formed of the second connecting portion 224, the second connecting portion 224, and the second inserting portion 222. Since the magnetic flux of the closed loop Lp2 is generated in the closed magnetic core formed of the lower cover 213, the second lower cover 223, the second connecting portion 224, and the second insertion portion 222, There is an advantage that can be minimized.

By minimizing the leakage magnetic flux as described above there is an advantage that can shield the flux noise causing bad operation characteristics to other elements of the inverter circuit.

In the flux noise shielding transformer A for inverters according to the present invention, the lengths L1 and L2 of the first partial core 210 and the second partial core 220 are the same, and the first inserting portion 212 is provided. Widths W1 and W2 of the second insertion portion 222 and the width Wo of the hollow portion 102 are respectively characterized in that the same.

As described above, the widths W1 and W2 of the first inserting portion 212 and the second inserting portion 222 are configured to be the same as the width Wo of the hollow portion 102, thereby providing the first inserting portion 212. And the second insertion portion 222 is press-fitted into the hollow portion 102 so that the first partial core 210 and the second partial core 220 are bobbin even without a separate fastening means (for example, an adhesive tape). There is an advantage that can be firmly fastened to (200).

In the flux noise shielding transformer (A) for inverters according to the present invention, the second upper cover 221 and the second lower cover 223 are elastically fitted to the plurality of slits 121 to be formed. It is characterized in that the two-part core 220 is more firmly coupled to the bobbin (100).

That is, when the second partial core 220 is coupled to the bobbin 200, the second upper cover 221 and the second lower cover 223 are inserted while being slit outward by a minute displacement by the slit 121. In this case, since the second upper cover 221 and the second lower cover 223 that are opened are held by the slit 121 by elasticity, the second partial core 220 is more firmly coupled to the bobbin 100. .

In the flux noise shielding transformer (A) for inverters according to the present invention, the magnetic substrate part 140 is hollow so that the first partial core 210 and the second partial core 220 can be smoothly coupled to the bobbin. It is formed in the both ends of the width direction of the part 102, respectively.

According to the above configuration, there is an advantage in that the first partial core 210 and the second partial core 220 can be smoothly inserted into the bobbin 200 without being disturbed by the terminal board unit 140.

Inverter flux noise shielding transformer (A) according to the present invention is the flow prevention for preventing the flow in the width direction in the state in which the first partial core 210 and the second partial core 220 is coupled to the bobbin 100 Rib 142 is characterized in that it is formed perpendicularly to the inside of the terminal substrate 140.

By the configuration of the flow preventing rib 142 can guide the first portion of the core 210 and the second portion of the core 220 is inserted into the bobbin smoothly, and prevents the flow in the width direction in the combined state. There is an advantage to this.

The flux flux shielding transformer A for inverters according to the present invention includes the first upper cover 211 and the first lower cover when the second partial core 220 is coupled to the first coil winding 110. 213 is configured to further include a fitting rib 112 protruding on the upper side and the lower side of the first coil winding unit 110 so as to be fitted by the elastic.

When the second partial core 220 is coupled to the first coil winding part 110 by the configuration of the fitting rib 112, the first upper cover 211 and the first lower cover 213 are fitted with ribs ( The first partial cover 210 and the first lower cover 211 and the second lower cover 213 are elastically inward as much as the gap is opened. It is firmly combined.

On the other hand, in the case of the transformer according to the present invention, as described above, when the magnetic core is coupled to the bobbin, it does not require a separate fastening means such as an adhesive tape, and since the fastening is performed only by insertion, the assembly labor and assembly time are shortened. This has the advantage of reducing product cost.

In addition, in the case of the transformer according to the present invention, as described above, the width of the magnetic core coupled to the bobbin may be configured to be equal to or smaller than the width of the hollow portion 102, and thus, the overall size is smaller than that of the related art. There is this.

Figure 7 shows a modification of the magnetic core in the flux noise shielding transformer for the inverter according to an embodiment of the present invention.

The magnetic core illustrated in FIG. 7 illustrates an example in which the lengths of the first partial core 210 ″ and the second partial core 220 ″ are different from each other. Of course, it belongs to the technical scope of this invention.

8 illustrates various modifications of the magnetic core in the flux noise shielding transformer for inverters according to an embodiment of the present invention. FIG. 8 is a cross-sectional view of a main part cut in a direction perpendicular to the length direction of the transformer.

As shown in FIG. 8, when the widths of the insertion parts 212 and 222 are different from the widths of the lids 211, 213, 221 and 223 ((a) and (b) of FIG. 8), the insertion parts 212 and 222. ) Various modifications are shown, such as the rounded or chamfered edges ((c) and (d) of FIG. 8).

9 is a cross-sectional view of a magnetic core of a flux noise shielding transformer for an inverter according to another embodiment of the present invention.

The magnetic core 200 ′ of the flux noise shielding transformer for inverters according to another embodiment of the present invention illustrated in FIG. 9 includes an insertion portion 212 ′ inserted into the hollow portion 102 and the insertion portion ( 212 ') and an upper cover 211' and a lower cover 213 'which cover and cover the upper and lower sides of the first coil winding 110 and the second coil winding 120, respectively. Vertical cross section vertically connecting the core body 210 'having a cross-section in the longitudinal direction of the' E 'shape and the ends of the upper cover 211', the lower cover 213 'and the insertion portion 212' ( 220 ').

The above embodiments of the present invention are merely one embodiment of the technical idea of the present invention, and of course, other modifications are possible within the technical idea of the present invention.

1 and 2 are exploded perspective views of a transformer for inverters according to the prior art.

3 is a perspective view of an inverter flux noise shielding transformer according to an embodiment of the present invention.

4 is a cross-sectional view in the longitudinal direction of an inverter flux noise shielding transformer according to an embodiment of the present invention.

FIG. 5 is a front view of the magnetic core in FIG. 3.

6 is an exploded perspective view of FIG. 3.

Fig. 7 is a modification of the magnetic core in the flux noise shielding transformer for inverters according to the embodiment of the present invention.

8 shows various modifications of the magnetic core in the flux noise shielding transformer for inverters according to an embodiment of the present invention.

9 is a cross-sectional view of a magnetic core of a flux noise shielding transformer for inverters according to another embodiment of the present invention.

          Explanation of symbols on the main parts of the drawings

100; Bobbin 102; Hollow part

110; First coil winding 112; Fitting rib

120; Second coil winding 121; Slit

130; Coil partition 140; Terminal board part

142; Flow preventing ribs 150; Coil terminal

200; Magnetic core 210; First part core

211; First upper cover 212; 1st insert

213; First lower cover 214; First connector

220; Second partial core 221; 2nd upper cover

222; Second insertion portion 223; 2nd lower cover

224; Second connecting portion Lp1; First closed loop

Lp2; Second closed loop

Claims (8)

A terminal board having a coil coil 150 disposed on both ends of the coil partition 130 and divided into a second coil winding part 120 having a plurality of slits 121 formed therein. The bobbin 100 having the hollow part 102 and the hollow part 102 of the bobbin 100 are formed integrally with each other and penetrate in the longitudinal direction between the terminal board parts 140 on both sides. A magnetic coil inserted into the magnetic core and a first coil wound around the first coil winding part 110 and the second coil winding part 120 to form a magnetic flux in the magnetic core; In an inverter transformer consisting of two coils: In the magnetic core 200, the magnetic flux induced by the time-varying current applied to the first coil and the second coil forms a first closed loop Lp1 upward from the hollow portion 102 and at the same time the hollow portion ( The cross section in the longitudinal direction is inserted into the hollow portion 102 and covers the upper side, the lower side, the front side, and the rear side of the bobbin 100 so as to form the second closed loop Lp2 from the bottom side 102, respectively. Flux noise shielding transformer for inverter, characterized in that the shape of. The method according to claim 1, wherein the magnetic core 200, The first inserting portion 212 inserted into the hollow portion 102 at one inlet of the hollow portion 102 and the upper side and the lower side of the bobbin 100 in parallel with the first inserting portion 212 A first upper cover 211 and a first lower cover 213 that cover and cover the first upper cover 211, a first lower cover 213, and a first insertion part 212, respectively The first partial core 210 is composed of a connecting portion 214, the longitudinal section of the cross section 'E' shape, A first material inserted into the hollow portion 102 at the other inlet of the hollow portion 102 to be in contact with the tip portion of the first insertion portion 212 to form a closed loop in contact with the tip portion of the first partial core 210. The upper side and the lower side of the bobbin 100 to be parallel to the second inserting portion 222 and the second inserting portion 222 and to the front ends of the first upper cover 211 and the first lower cover 213, respectively. Connecting the second upper cover 221 and the second lower cover 223 and the second upper cover 221, the second lower cover 223, and the second inserting portion 222 to partially cover the respective upper and lower covers. Flux noise shielding transformer for inverter, characterized in that consisting of the second connection portion 224 is composed of a second partial core (220) having a cross section in the longitudinal direction of the 'E' shape. The method according to claim 2, The terminal board part 140 is formed at both ends of the hollow portion 102 in the width direction so that the first partial core 210 and the second partial core 220 can be smoothly coupled to the bobbin. The flow preventing rib 142 for preventing the flow in the width direction in the state in which the first partial core 210 and the second partial core 220 are coupled to the bobbin 100, the inner side of the terminal board 140. Flux noise shielding transformer for inverter, characterized in that is formed perpendicular to the. The method according to claim 2 or 3, The second upper cover 221 and the second lower cover 223 are fitted to the plurality of slits 121 by elasticity so that the second partial core 220 is more firmly coupled to the bobbin 100. Flux noise shielding transformer for inverters. The method according to claim 4, When the second partial core 220 is coupled to the first coil winding part 110, the first coil winding part is fitted to the first upper cover 211 and the first lower cover 213 by elasticity. Flux noise shielding transformer for inverters, characterized in that the upper and lower portions of the fitting ribs 112 are formed to protrude respectively. The method according to claim 5, Flux noise shielding transformer for the inverter, characterized in that the length (L1, L2) of the first partial core 210 and the second partial core 220 is the same. The method according to claim 5, Flux shielding transformer for inverters, characterized in that the width (W1, W2) of the first insertion portion (212) and the second insertion portion (222) is the same as the width (Wo) of the hollow portion (102), respectively. The method according to claim 1, wherein the magnetic core 200 ', Upper and lower portions of the insertion part 212 ′ inserted into the hollow part 102 and the first coil winding part 110 and the second coil winding part 120 side by side with the insertion part 212 ′. A core body 210 'having an E-shaped cross section in the longitudinal direction, consisting of an upper cover 211' and a lower cover 213 'to cover each other; And Inverter flux noise shielding transformer, characterized in that the upper cover (211 '), the lower cover (213') and the vertical connection portion 220 'for connecting the front end of the insertion portion (212') vertically.

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