KR20120118734A

KR20120118734A - Method and apparatus for reducing displacement current flows from switching power supply to electrical earth by shield and cancellation

Info

Publication number: KR20120118734A
Application number: KR1020110036293A
Authority: KR
Inventors: 박찬웅
Original assignee: 박찬웅
Priority date: 2011-04-19
Filing date: 2011-04-19
Publication date: 2012-10-29

Abstract

The present invention lowers and cancels the capacitive coupling current between the input winding and the output winding of a switching power supply by shielding and canceling, so that the output line of the power supply has a low noise potential, and thus, the power supply and the electrical ground. The present invention relates to a magnetic energy transfer device and a power supply device which significantly lowers the displacement current of a.

Description

Methods and apparatus for reducing displacement current flows from switching power supply to electrical earth by shield and cancellation}

The present invention relates to a switching power supply, and in particular, by shielding and canceling, by reducing and canceling the capacitive coupling current between the input winding and the output winding of the transformer of the switching power supply so that the output line of the power supply has a significantly low noise potential The present invention relates to a magnetic energy transfer device and a power supply device for lowering a displacement current between a power supply device and an electrical ground. The transformer according to the present invention has a simple structure, high coupling between the input and the output, and low liquidity inductance. Efficiency can be obtained, the noise transmitted to the output line is very low, and the winding operation is easy, and the productivity is high.

Conventionally, there have been magnetic energy transfer devices or power supplies configured to significantly reduce the displacement current flowing from the power supply to the electrical ground by the winding method of the transformer of the flyback converter. As a result, the productivity of the transformer was low, causing the unit price to rise.

Brief description of the prior art is as follows.

FIG. 1 is a block diagram of a typical flyback converter, and FIG. 2 is coupled by a distribution capacity inside a transformer in the flyback converter of FIG. 1 so that each portion of the power supply device has a potential difference with respect to an electrical ground. Explain the principle of generating. In all the figures presented below, the black dots on each winding of the transformer indicate the beginning or end of the windings.

In Fig. 2, typically, one end of the input winding 131 of the transformer 13 and the connection point of the switching element 12 have a very fast voltage change rate when the switching element 12 is turned off and a maximum of 500 to 600 volts. Variation in potential occurs, and among the inductance components of the input winding 131 of the transformer 13, the ringing component having a very high frequency is included due to the influence of the liquid crystal inductance and the distribution capacity which are not coupled to the output winding 134. The change in the potential is transmitted to the output winding 134 through the distribution capacitance Cps between the input winding 131 and the output winding 134 to generate a noise voltage, and the output line 17 generates a noise potential. To have. In addition, the change of the electric potential is transmitted to the input line 16 through the distribution capacitance Cpi between the input winding 131 and the input line 16, and between the input winding 131 and the core 136 of the transformer. It is delivered to the core 136 of the transformer through the distribution capacity (Cpc) of the, so that the input line 16 and the core 136 of the transformer has a potential of the noise component. The potential of the noise component of the input line 16, the core 136 of the transformer, and the output line 17 is the distribution capacitance between the input line and ground (Cig) and the distribution capacity between the core 136 and ground of the transformer, respectively. Displacement current flows through (Ccg) and the distribution capacity (Cog) between the output line and ground to generate common mode noise, which is measured as conductive noise by a measuring instrument called Line Input Stabilization Network (LISN). Therefore, the noise current should be managed below the level set by the law.

3A and 3B show that the potential of the input windings 132 or 182 of the transformer 13 or 18 is transferred to the input line 16 or the output line 17 of the power supply or the core 136 or 186 of the transformer. Examples of the structure of the prior art transformer for preventing the noise current from flowing to ground are shown.

The offset winding 131 of the transformer 13 shown in FIG. 3A is wound at equal intervals on the bottom of the first layer of the input winding 132 to form an electrostatic field of opposite polarity to the input winding 132. The electrostatic field formed by 132 cancels the transformer core 136 or the input line 16 from exhibiting a noise potential. Further, the balance winding 133 of the transformer 13 is wound on the upper surface of the last layer of the input winding 132 at equal intervals to form and offset an electrostatic field having a polarity opposite to that of the input winding 132. 132 and the balance of the electrostatic field generated by the balance winding 133 equal to the strength of the electrostatic field generated by the output winding 134, blocking the coupling to the output winding 134 due to the difference of the electrostatic field It is supposed to.

However, in the technique of FIG. 3A, the offset winding 131 and the balance winding 133, which are required to maintain an even interval, vary greatly in the offset effect of the electrostatic field depending on the variation in the physical position being wound. In addition, the input winding 132 is structurally coupled to the coil winding 131 or the balance winding 133, most of the winding surface of the transformer core 136 or the output winding 134, except for the portion wound around the winding winding Therefore, a large capacitive coupling current is generated between the input winding 132 and the transformer core 136 and between the input winding 132 and the output winding 134. Depending on the winding state of the transformer, the coupling condition Since there is a large difference, the magnitude of the coupling current also has a large deviation. Therefore, the technique of FIG. 3A is too short offset in some transformers and too much offset in other transformers due to the deviation of the windings, so it is very difficult to expect consistent offset characteristics in mass production, thus reducing the conduction noise to below specified values. It is very difficult to manage stably.

The transformer 18a shown in FIG. 3B is a technique that is used to improve the disadvantage of the large deviation of the technique of FIG. 3A.

The first shield winding 181 of the transformer 18a surrounds the bottom of the first layer of the input winding 182 so that the bottom of the first layer of the input winding 182 having the high potential variation is the input line 16 or the transformer core. 186 shields the capacitive coupling, and a component of the capacitive coupling current generated in spite of the shielding also generates a coupling current at the potential of the first shielding winding 181 having a reverse polarity to that of the input winding 182. The input line 16 and the transformer core 186 have a remarkably low noise potential. In addition, the second shield winding 183 of the transformer 18 surrounds the top surface of the last layer of the input winding 182 so that the variation of the potential of the last layer of the input winding 182 is capacitively coupled with the output winding 185. Capacitive coupling current that is not shielded and flows from the input winding 182 to the output winding 184 despite the shielding by the second shielding winding 183, so that the output winding 184 and the second shielding winding ( 183 is canceled by the capacitive coupling current of the reverse polarity due to the potential difference between them, and the generation of noise in the output winding 184 is significantly reduced, so that the potential of the noise in the output line 17 becomes low.

However, when the output voltage is low at 5V, the coupling current flowing from the input winding 182 having a high potential to the output winding 185 having a low potential is applied to the potential difference between the output winding 185 and the second shield winding 183. In order to cancel the capacitive coupling current, the second shield winding 183 should have a smaller number of turns than the output winding 185. For example, the winding width of the bobbin of the ferrite core having a size of 16 mm X 16 mm is 7.5 mm. When the number of turns of the output winding 185 is 8 turns, 6 to 7 turns are required as the second shield winding 183, and the input winding ( In order to completely cover the winding width of 7.5mm with 7 turns of the second shielding winding 183 to prevent the 182 from capacitively coupling with the output winding 185, a thin line of 0.18 mm diameter is laid out in five straight lines. Since it must be wound in parallel, there is a disadvantage that the productivity is very low.

In addition, it is necessary to draw an auxiliary power supply voltage of 7V to 8V for driving the switching element 12 from the transformer and supply the auxiliary power supply voltage. The second shielding winding 183 alone does not allow the extraction of a voltage of 7V to 8V higher than the output voltage. In this case, since the transformer has to wind the second shield winding 183 and the bias winding 184 between the input winding 182 and the output winding 185 as shown in FIG. 3C, the winding structure becomes complicated and the input winding ( Among the 182, the inductance component that cannot be combined with the output winding 185 is increased, so that the efficiency is lowered and the unit cost of the transformer 13c is increased.

The prior art has a second shield winding 183 having a small number of turns to wound the thin line in parallel by 5 strands to completely fill the winding width of the bobbin, the automation is difficult and productivity is reduced, switching element 12 When the auxiliary power source is required for driving the coil, the second shield winding 183 and the bias winding 184 must be wound between the input winding 182 and the output winding 185, so that the combination of the input winding and the output winding This worsened, the inductance increased, the efficiency was lowered, and the structure of the transformer is complicated, the unit price increases.

The present invention addresses all of the above disadvantages of the prior art.

This invention applies to a forward converter and a flyback converter, but the description according to the embodiment only describes the flyback converter.

It is used in a switching power supply including a + voltage input terminal, a-voltage input terminal, a switching element, a magnetic energy transfer element, and an output rectifier for achieving the above object, and between the switching power supply and the electrical ground. Magnetic energy transfer device for lowering the displacement current,

A core of the magnetic energy transfer device; A first winding wound around a core of the magnetic energy transfer device, the current flowing by the switching element interruption being controlled; A second winding wound to face one side of the first winding and magnetically coupled with the first winding to draw energy and supply it to a load; The first winding is wound between the winding layer of the first winding and the layer closest to the second winding, and the winding layer of the second winding is closest to the first winding. A third winding shielding it from being coupled; And in spite of the shielding of the third shielding winding, the coupling current generated by the change of the potential difference between the first winding and the second winding and the potential difference between the third winding and the second winding And a fourth winding for generating another coupling current to cancel the coupling current.

In addition, it is used in a switching type power supply including a + voltage input terminal, a-voltage input terminal, a switching element, a magnetic energy transfer element, and an output rectifying unit for achieving the above object, and between the switching power source and the electrical ground. Magnetic energy transfer element that lowers the displacement current between,

A core of the magnetic energy transfer device; A first winding wound around the core of the magnetic energy transfer element and connected to one terminal of the switching element to control the flow of current by the interruption of the switching element; It is wound to face one side of the first winding, magnetically coupled with the first winding to draw energy and supply it to the load, and the potential of the terminal drawn to the output rectifier is one side of the switching element of the first winding. A second winding having a variation in the potential of the terminal connected to the terminal and a variation in the reverse polarity; And wound between the layer closest to the second winding among the winding layers of the first winding and the layer closest to the first winding among the winding layers of the second winding, wherein the first winding is wound with the second winding. Shielding against the coupling between the first winding and the first winding and the first winding despite the shielding by generating a coupling current due to a potential difference between the second winding and a change in the potential of the first winding and a potential of a reverse polarity. And a third winding that cancels the coupling current generated by the change in the potential difference between the two windings.

A core of the magnetic energy transfer device; A first winding wound around the core of the magnetic energy transfer element and connected to one terminal of the switching element to control the flow of current by the interruption of the switching element; It is wound to face one side of the first winding, magnetically coupled with the first winding to draw energy and supply it to the load, and the potential of the terminal drawn to the output rectifier is one side of the switching element of the first winding. A second winding having a variation in the potential of the terminal connected to the terminal and a variation in the reverse polarity; The first winding is wound between the layer closest to the second winding among the winding layers of the first winding and the layer closest to the first winding among the winding layers of the second winding, so that the first winding is capacitive with the second winding. A third winding shielding it from being coupled with each other; And a fourth winding for generating another coupling current to cancel a difference between the coupling current flowing from the first winding to the second winding and the coupling current flowing from the third winding to the second winding. It is done.

A core of the magnetic energy transfer device; A first winding wound around the core of the magnetic energy transfer element and connected to one terminal of the switching element to control the flow of current by the interruption of the switching element; A second winding wound to face one side of the first winding and magnetically coupled with the first winding to draw energy and supply it to a load; The first winding is wound between the winding layer of the first winding and the layer closest to the second winding, and the winding layer of the second winding is closest to the first winding. A third winding that shields from coupling and has a variation in the potential of the terminal connected to one terminal of the switching element of the first winding and a variation in the reverse polarity; And the first winding and the third winding are wound between the layer closest to the second winding among the winding layers of the third winding and the layer closest to the third winding among the winding layers of the second winding. It characterized in that it comprises a fourth winding to shield the two windings and capacitive coupling.

Further, there is provided a flyback converter and a forward converter including the above-described magnetic energy transfer device.

In addition, the power supply apparatus according to the present invention is characterized by including the above-described magnetic energy transfer device.

Also provided is a product comprising the above-described power supply apparatus according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to the method and apparatus for significantly canceling the displacement current of the noise between the power supply and the ground by the winding of the transformer of the flyback converter according to an embodiment of the present invention.

According to the present invention, the shielding winding for shielding the capacitive coupling between the input winding and the output winding has a much larger number of turns than the conventional technology, so that the bobbin width can be filled with fewer strands, thereby improving the productivity of the transformer. It is possible to increase the auxiliary power required for the driving circuit from the shielding winding, and to eliminate the need for additional sensing of the winding for the auxiliary power between the input winding and the output winding, and to maintain the coupling between the input winding and the output winding. This improves efficiency and lowers the cost of the transformer.

1 is a block diagram of a flyback converter according to the prior art
Figure 2 is a generation diagram of the displacement current flowing to the ground by the distribution capacity inside the transformer in the flyback converter according to the prior art.
3A and 3B illustrate an example of attenuating the potential of noise between a power supply and ground by winding of a transformer in the prior art.
Figure 3c is an example of the structure of a transformer including a winding for auxiliary power draw in the prior art
4A, 4B and 4C show an embodiment of a flyback converter constructed in accordance with this invention.
5A and 5B illustrate embodiments of the structure of a transformer for the flyback converter of FIGS. 4A and 4C.
Figure 6 is a comparison comparing the principle of canceling the coupling current in the prior art and the present invention
FIG. 7 shows another embodiment of the structure of a transformer for the flyback converter of FIG. 4A.
FIG. 8 shows another embodiment of the structure of a transformer for the flyback converter of FIG. 4A.
9 shows another embodiment of a flyback converter constructed in accordance with this invention.
10A, 10B and 10C show further embodiments of a flyback converter constructed in accordance with this invention.
FIG. 11 is a comparison of the prior art of FIG. 3C and the principle of canceling the coupling current of the present invention of FIGS. 10A, 10B, and 10C.
12A, 12B and 12C show an embodiment of the structure of a transformer for the flyback converter of FIGS. 10A and 10B.
Figure 13 shows another embodiment of a flyback converter constructed in accordance with this invention.
14 is an embodiment of a structure of a transformer for the flyback converter of FIG.
15A, 15B and 15C show another embodiment of a flyback converter constructed in accordance with this invention.
FIG. 16 shows an embodiment of a structure of a transformer for the flyback converter of FIG. 15A

[First Embodiment]

Figure 4a is a representative example of a flyback converter including a magnetic energy transfer device having a structure for canceling the coupling current between the input winding and the output winding according to the present invention, Figure 5a is a transformer of the flyback converter of Figure 4a One embodiment of the structure is shown.

In FIG. 5A, the transformer 19 includes a transformer core 196, a first shield winding 191, an input winding 192, a second shield winding 193, an output winding 194, and a balance winding 195. The role of the first shield winding 191 of the transformer 19 is the same as the role of the first shield winding 181 in the prior art of FIG. 3B. The second shield winding 193 of the transformer 19 surrounds the top surface of the last layer of the input winding 192 to shield the last layer of the input winding 192 from capacitively coupling with the output winding 194. In the present invention, since the second shield winding 193 has a larger number of turns than the output winding 194 in order to be wound by fewer strands, the output winding 194 is formed by the second shield winding 193. Despite the shielding, the output winding is caused by the capacitive coupling current flowing from the input winding 192 to the output winding 194 and the potential difference between the second shield winding 193 and the second shield winding 193 and the output winding 194. The capacitive coupling current flowing to 194 is added to flow. The output winding 194 is wound on the side opposite to the second shield winding 193, and the balance winding 195 is wound over a portion or the entire surface of the surface, and the balance winding 195 is connected to the output winding 194. The sum of the combined current generated by the potential difference of the combined current generated from the input winding 192 to the output winding 194 and the combined current generated from the second shield winding 193 to the output winding 194 is the same as the reverse polarity. By generating so as to cancel each other, the potential of noise due to the capacitive coupling current of the output line 17 is significantly lowered.

In the present invention, as in the prior art, when the number of turns of the output winding 194 is 8 turns, the second shield winding 193 may increase to 13 turns or more desired turns, which is nearly twice that of the 7 turns in FIG. 3A. In the prior art, in order to completely cover the winding width of 7.5 mm with the second shield winding 183 in seven turns, the thin wire of 0.18 mm diameter was unfolded in five strands and wound tightly in parallel. In the case of the present invention, since 0.18mm diameter wire can be wound into three strands, the number of strands is reduced, which is much more advantageous for automation, and the productivity is improved, which lowers the unit cost of the transformer, and it is about 9V in the 13 turn second shielding winding 193. Since the auxiliary power voltage can be drawn out, it is not necessary to detect a separate auxiliary winding between the input winding 192 and the output winding 194, so that the coupling degree can be increased, so that the inductance of the liquid is lowered and the efficiency is high. It has the advantage of the like.

FIG. 4A is a reference point of the first shielding winding 191, the second shielding winding 193, and the balance winding 195 in an alternating manner to the + input voltage line corresponding to ground. In FIG. 4B, the reference point of these windings is shown. Is connected alternatingly to the input voltage line corresponding to ground, and FIG. 4A and FIG. 4B are alternatingly equivalent.

4C is another configuration diagram of a flyback converter constructed in accordance with the present invention, in which the balanced winding is connected to the output winding side.

The second shield winding 193 of the transformer 19c is wound more than the number of turns necessary to cancel the capacitive coupling current flowing from the input winding 192 to the output winding 194 and is output from the second shield winding 193. The cancellation current flowing over the winding 194 is removed using the coupling current between the balance winding 197 and the second shield winding 193, so that the potential of the noise of the output line 17 is significantly lowered.

FIG. 5B shows embodiments of the structure of a transformer for the flyback converter of FIG. 4C.

Figure 6 shows a comparison comparing the principle of canceling the coupling current in the prior art and the present invention.

7 and 8 show another embodiment of the structure of the transformer for the flyback converter of FIG. 4A, where FIG. 7 winds the balance winding 205 between the second shield winding 203 and the output winding 204. FIG. 8 is a structure in which the balance winding 215 is wound on a portion of the same layer as the second shield winding 213 wound between the input winding 212 and the output winding 214. The structures of the transformers of FIGS. 4, 7, and 8 may be selected according to the preference of the winding operation.

9 shows another example of a flyback converter according to this invention.

The first shielding winding 191 of the transformer 19 of FIG. 4A has a potential of reverse polarity to that of the input winding 192, and the input winding 192 has a capacitive input line 16 or a transformer core 196. The first shield winding 221 of the transformer 22 of FIG. 9 has a potential of the same polarity as that of the input winding 222. In addition, the input line 16 and the transformer core 186 have a low noise potential by only blocking the potential of the input winding 222 so as not to be capacitively coupled to the input line 16 or the transformer core 226.

9 may be selected and applied when it is necessary to utilize the voltage of the positive polarity of the first shielding winding 221.

[Second Embodiment]

10A, 10B and 10C are other embodiments of a flyback converter configured for the above-mentioned purposes.

In FIG. 10A, the transformer 23a includes an input winding 232, an output winding 234, a first shield winding 231, and a second shield winding 233a, wherein the second shield winding 233a is input. It is wound between the winding 232 and the output winding 234 to shield the coupling current between the input winding 232 and the output winding 234, and the coupling current flowing in spite of the shielding to the potential difference with the output winding 234. By generating a coupling current of reverse polarity.

The voltage of the terminal connected to one end of the switching element 12 among the terminals of the input winding 232 of the transformer 23a and the voltage of the terminal connected to the output rectifying diode 14a of the output winding 234 are opposite in polarity. By increasing the potential difference between the input winding 232 and the output winding 234, the coupling current flowing from the input winding 232 to the output winding 234 is larger than the coupling current in the prior art, thereby providing optimum offsetting. It is configured such that the number of turns of the second shield winding 233a required for the sake becomes larger than the difference from the number of turns of the output winding 234 in the prior art. On the other hand, in order to cancel the coupling current flowing from the input winding 232 to the output winding 234 having a reverse polarity to the potential of the input winding 232, the second shield winding 233a has a greater reverse polarity than the output winding 234. Should be the voltage of In the prior art of FIG. 3B, the second shielding winding 183 needs 6T when the output winding 185 is 8T, but in the case of FIG. 10A, the second shield winding 233a is turned when the output winding 185 is 8T. The number is increased to 11T, which can be wound with fewer strands than in the prior art, thereby improving productivity, and drawing auxiliary voltages of about 7V from the second shielding winding 183, thereby detecting a separate auxiliary winding. You don't have to.

FIG. 10B shows that the number of turns of the second shielding winding 233b is wound more than the number of turns for optimum offsetting, in order to further increase the number of turns of the second shielding winding 233a to improve the winding operation. 10C shows an embodiment in which the offset current is compensated by the balance winding 235, and FIG. 10C shows an embodiment in which the balance winding 237 is connected to the output winding 234, and FIG. It is a comparative view of offset comparing the principle of offset of FIG. 10C.

In FIG. 10A, the point polarity of the second shield winding 233a is connected to the capacitor 24, which is the point polarity of the second shield winding 233a connected to the + terminal or the − terminal of the input capacitor 11. Interchangeably the same.

12A is an example of a structural diagram of a transformer 23a for the flyback converter of FIG. 10A, and FIG. 12B is an example of a structural diagram of a transformer 23b for the flyback converter of FIG. 10B.

FIG. 12C illustrates the increase and decrease of the number of turns of the input winding 232a of the closest layer facing the output winding 234 among the input windings 232 of the transformer 23c to increase or decrease the current coupled to the output winding 234. The number of turns of the second shield winding 233a can be selected as the desired number of turns.

FIG. 13 illustrates a capacitive coupling between a transformer core 264 and a layer of an input winding 261 having a high potential using the input winding 261a having the lowest potential among the input windings 261 of the transformer 26. The desired number of turns of the second shield winding 233a is shielded and the desired number of turns of the second shield winding 233a is increased by increasing or decreasing the current coupled to the output winding 234 using the potential of the input winding 261b which is superimposed on the potential of the input winding 261a. Allows you to select a number.

FIG. 14 is an example of a structural diagram of a transformer 23a for the flyback converter of FIG. 13.

[Third Embodiment]

15A, 15B and 15C show yet another embodiment of the flyback converter configured for the above-mentioned purpose, and FIG. 16 shows an embodiment of the structure of the transformer 27a for the flyback converter of FIG. 15A.

In FIG. 15A, the transformer 27a has a first shield winding 271 that shields and cancels the transformer core 277 from capacitively coupling to the potential of the input winding 272 as described above, and the input winding A second shield winding 274 is inserted between 272 and the output winding 275 so that the second shield winding 274 has a greater number of turns than the output winding 275 to perform optimal shielding and offsetting. To this end, a reverse voltage winding 273 is inserted between the second shield winding 274 and the output winding 275 having a potential of reverse polarity and a potential of the input winding 272 and the output winding 275.

FIG. 15B adds a balance winding 276 to further increase the number of turns of the second shield winding 274, as in the description of FIG. 5A.

15C illustrates an example in which the reverse voltage winding 273a is wound after the first shield winding 271. It is a structure that can effectively draw out the energy accumulated in the liquid crystal inductance that is not coupled to the output winding 275 of the input winding 271 through the first shield winding 271 and the reverse voltage winding 273a. It can be used for the purpose of removing the RCD clamp circuit connected to one end of the 271 and the connection point of the switching element 12.

Although the technical spirit of the present invention has been described above with the accompanying drawings, it is intended to exemplarily describe the best embodiment of the present invention, but not to limit the present invention. In addition, if an insulating tape is inserted between the winding and the winding of a transformer not shown in this invention, or a barrier tape for securing an insulating distance is added to one or both sides of the winding width of the bobbin, it is additionally required by the power supply. It is evident that any modification or imitation can be made without departing from the scope of the technical idea of the present invention, by adding windings for use or by those skilled in the art.

11 is input capacitor, 12 is switching element, 13 is conventional transformer, 14 is output rectifier, 15 is output capacitor, 16 is input line, 17 is output line, Cps is distribution capacity between input winding and output winding, Cpc Is the distribution capacity between the input winding and the transformer core, Csc is the distribution capacity between the output winding and the transformer core, Cpi is the distribution capacity between the input winding and the input line, Cig is the distribution capacity between the input winding and the input line, and Ccg is the transformer core. Distribution capacity between ground and ground, Cog is the distribution capacitance between output line and ground, 18a and 18b are conventional transformers
19 is a transformer according to the present invention, 19b is another transformer according to the present invention, 20 and 21 and 22 is another transformer according to the present invention, 23a and 23b and 23c is another transformer according to the present invention, and 24 is an auxiliary power supply Utilization capacitor, 25 is an auxiliary power rectifier, 26 is another transformer according to the present invention, 27a and 27b and 27c are yet another transformer according to the present invention.

Claims

It is used in switching type power supply which includes + voltage input terminal,-voltage input terminal, switching element, magnetic energy transfer element, and output rectifier, and it reduces the displacement current between switching power supply and electrical ground. In the energy transfer device,
A core of the magnetic energy transfer device;
A first winding wound around a core of the magnetic energy transfer device, the current flowing by the switching element interruption being controlled;
A second winding wound to face one side of the first winding and magnetically coupled with the first winding to draw energy and supply it to a load;
The first winding is wound between the winding layer of the first winding and the layer closest to the second winding, and the winding layer of the second winding is closest to the first winding. A third winding shielding it from being coupled; And
The coupling current generated by the change in the potential difference between the first winding and the second winding and the potential difference between the third winding and the second winding despite the shielding of the third shield winding Magnetic energy transfer device comprising a fourth winding for generating another coupling current to cancel the current

The magnetic energy transfer device of claim 1, wherein the coupling current flowing from the first winding and the third winding to the second winding is canceled by a coupling current generated by the potential difference between the fourth winding and the third winding. Magnetic energy transfer device, characterized in that

The magnetic energy transmitting device of claim 2, wherein the fourth winding is wound around a portion of the same layer as the layer to which the second winding is wound.

The magnetic energy transfer device of claim 2, wherein the fourth winding is wound between a winding of the second winding and a winding of a portion of the same layer as the winding of the second winding. device

The magnetic energy transfer device of claim 2, wherein the fourth winding is between a layer closest to the third winding among the winding layers of the second winding and a layer closest to the second winding among the winding layers of the third winding. Magnetic energy transfer device, characterized in that wound on

The magnetic energy transfer device of claim 1, wherein the coupling current flowing from the first winding and the third winding to the second winding is canceled by a coupling current generated by a potential difference between the fourth winding and the second winding. Magnetic energy transfer device, characterized in that

The magnetic energy transmitting device of claim 6, wherein the fourth winding is between the layer closest to the third winding among the winding layers of the second winding and the layer closest to the second winding among the winding layers of the third winding. Magnetic energy transfer device, characterized in that wound on

The magnetic energy transfer device of claim 6, wherein the fourth winding is wound to face an opposite side of the side of the second winding that faces the first winding.

The magnetic energy transfer device of claim 6, wherein the fourth winding is between a layer closest to the second winding among the winding layers of the first winding and a layer closest to the first winding among the winding layers of the second winding. Magnetic energy transfer device, characterized in that wound on a portion of the same layer as the third winding wound on

The magnetic energy transfer device of claim 1, wherein the first winding is wound to face the opposite side of the side of the first winding that faces the second winding so that the first winding is not capacitively coupled to the core of the magnetic energy transfer device. Magnetic energy transfer device further comprises a fifth winding shielding

12. The magnetic energy transmitting device of claim 10, wherein the fifth winding is part of the first winding.

The magnetic energy transfer device of claim 1, wherein the first winding is wound to face the opposite side of the side of the first winding that faces the second winding so that the first winding is not capacitively coupled to the core of the magnetic energy transfer device. Shielding, and in spite of the shielding, a component in which the first winding is capacitively coupled to the core of the magnetic energy transfer element is capacitively coupled to the core of the magnetic energy transfer element at a voltage of reverse polarity with the first winding. Magnetic energy transfer device further comprises a fifth winding to cancel

It is used in switching type power supply which includes + voltage input terminal,-voltage input terminal, switching element, magnetic energy transfer element, and output rectifier, and it reduces the displacement current between switching power supply and electrical ground. In the energy transfer device,
A core of the magnetic energy transfer device;
A first winding wound around the core of the magnetic energy transfer element and connected to one terminal of the switching element to control the flow of current by the interruption of the switching element;
It is wound to face one side of the first winding, magnetically coupled with the first winding to draw energy and supply it to the load, and the potential of the terminal drawn to the output rectifier is one side of the switching element of the first winding. A second winding having a variation in the potential of the terminal connected to the terminal and a variation in the reverse polarity; And
The first winding is wound between the layer closest to the second winding among the winding layers of the first winding and the layer closest to the first winding among the winding layers of the second winding, so that the first winding is capacitive with the second winding. Shielding against the coupling between the first winding and the second winding with a variation in the potential of the first winding and a potential of the reverse polarity to generate a coupling current due to the potential difference with the second winding. And a third winding for canceling the coupling current generated by the change in potential difference between the windings.

15. The magnetic energy transmitting device of claim 13, wherein the first winding is wound to face the opposite side of the surface of the first winding that faces the second winding so that the first winding cannot be capacitively coupled to the core of the magnetic energy transmitting device. Magnetic energy transfer device further comprises a fourth winding shielding

15. The magnetic energy transmitting device of claim 14, wherein the fourth winding is part of the first winding.

15. The magnetic energy transmitting device of claim 13, wherein the first winding is wound to face the opposite side of the surface of the first winding that faces the second winding so that the first winding cannot be capacitively coupled to the core of the magnetic energy transmitting device. Shielding, and in spite of the shielding, a component in which the first winding is capacitively coupled to the core of the magnetic energy transfer element is capacitively coupled to the core of the magnetic energy transfer element at a voltage of reverse polarity with the first winding. Magnetic energy transfer device further comprises a fourth winding to cancel

It is used in switching type power supply which includes + voltage input terminal,-voltage input terminal, switching element, magnetic energy transfer element, and output rectifier, and it reduces the displacement current between switching power supply and electrical ground. In the energy transfer device,
A core of the magnetic energy transfer device;
A first winding wound around the core of the magnetic energy transfer element and connected to one terminal of the switching element to control the flow of current by the interruption of the switching element;
It is wound to face one side of the first winding, magnetically coupled with the first winding to draw energy and supply it to the load, and the potential of the terminal drawn to the output rectifier is one side of the switching element of the first winding. A second winding having a variation in the potential of the terminal connected to the terminal and a variation in the reverse polarity;
The first winding is wound between the layer closest to the second winding among the winding layers of the first winding and the layer closest to the first winding among the winding layers of the second winding, so that the first winding is capacitive with the second winding. A third winding shielding it from being coupled with each other; And
And a fourth winding for generating another coupling current to cancel a difference between the coupling current flowing from the first winding to the second winding and the coupling current flowing from the third winding to the second winding. Magnetic energy transfer device

The magnetic energy transmitting device of claim 17, wherein the coupling current flowing from the first winding to the second winding by the coupling current generated by the potential difference between the fourth winding and the third winding and the second winding from the second winding. Magnetic energy transfer device characterized in that the difference with the coupling current flowing in the third winding is canceled

19. The magnetic energy transmitting device of claim 18, wherein the fourth winding is wound around a portion of the same layer as the layer to which the second winding is wound.

19. The magnetic energy transmitting device of claim 18, wherein the fourth winding is wound between a winding of the second winding and a winding of a part of the same layer as the layer on which the second winding is wound. Transfer element

19. The magnetic energy transmitting device of claim 18, wherein the fourth winding is between the layer closest to the third winding among the winding layers of the second winding and the layer closest to the second winding among the winding layers of the third winding. Magnetic energy transfer device, characterized in that wound on

18. The magnetic energy transmitting device of claim 17, wherein the coupling current flowing from the first winding to the second winding by the coupling current generated by the potential difference between the fourth winding and the second winding and the second winding from the second winding. Magnetic energy transfer device characterized in that the difference with the coupling current flowing in the third winding is canceled

23. The magnetic energy transmitting device of claim 22, wherein the fourth winding is between a layer closest to the third winding among the winding layers of the second winding and a layer closest to the second winding among the winding layers of the third winding. Magnetic energy transfer device, characterized in that wound on

23. The magnetic energy transmitting device of claim 22, wherein the fourth winding is wound to face an opposite side of a surface of the second winding that faces the first winding.

23. The magnetic energy transmitting device of claim 22, wherein the fourth winding is wound on a portion of the same layer as the third winding wound between the first winding and the second winding.

The magnetic energy transmitting device of claim 17, wherein the first winding is wound to face the opposite side of the surface of the first winding that faces the second winding so that the first winding cannot be capacitively coupled to the core of the magnetic energy transmitting device. Magnetic energy transfer device further comprises a fifth winding shielding

27. The magnetic energy transmitting device of claim 26, wherein the fifth winding is part of the first winding.

The magnetic energy transmitting device of claim 17, wherein the first winding is wound to face the opposite side of the surface of the first winding that faces the second winding so that the first winding cannot be capacitively coupled to the core of the magnetic energy transmitting device. Shielding, and in spite of the shielding, a component in which the first winding is capacitively coupled to the core of the magnetic energy transfer element is capacitively coupled to the core of the magnetic energy transfer element at a voltage of reverse polarity with the first winding. Magnetic energy transfer device further comprises a fifth winding to cancel

It is used in switching type power supply which includes + voltage input terminal,-voltage input terminal, switching element, magnetic energy transfer element, and output rectifier, and it reduces the displacement current between switching power supply and electrical ground. In the energy transfer device,
A core of the magnetic energy transfer device;
A first winding wound around the core of the magnetic energy transfer element and connected to one terminal of the switching element to control the flow of current by the interruption of the switching element;
A second winding wound to face one side of the first winding and magnetically coupled with the first winding to draw energy and supply it to a load;
The first winding is wound between the winding layer of the first winding and the layer closest to the second winding, and the winding layer of the second winding is closest to the first winding. A third winding that shields from coupling and has a variation in the potential of the terminal connected to one terminal of the switching element of the first winding and a variation in the reverse polarity; And
The first winding and the third winding are wound between a layer closest to the second winding among the winding layers of the third winding and a layer closest to the third winding among the winding layers of the second winding. Magnetic energy transfer device comprising a fourth winding shielding the winding and capacitive coupling

30. The magnetic energy transfer device of claim 29, wherein the first winding and the second winding are shielded by the fourth winding so that the first winding and the third winding are not capacitively coupled to the second winding. The coupling current generated by the change in the potential difference between the windings and the coupling current generated by the change in the potential difference between the third winding and the second winding are changed by the change in the potential difference between the fourth winding and the second winding. Magnetic energy transfer device, characterized in that offset by the generated coupling current

The magnetic energy transfer device according to claim 29, further comprising: offsetting a difference between a coupling current flowing from the first winding and the third winding to the second winding and a coupling current flowing from the second winding to the fourth winding; Magnetic energy transfer device further comprises a fifth winding for generating another coupling current

32. The magnetic energy transfer device of claim 31, wherein the coupling current flowing from the first winding and the third winding to the second winding by a coupling current generated by a potential difference between the fifth winding and the fourth winding; Magnetic energy transfer device characterized in that the difference from the coupling current flowing from the second winding to the fourth winding

33. The magnetic energy transmitting device of claim 32, wherein the fourth winding is wound around a portion of the same layer as the layer to which the second winding is wound.

33. The magnetic energy transfer device of claim 32, wherein the fourth winding is wound between a winding of the second winding and a winding on a portion of the same layer as the layer on which the second winding is wound.

33. The magnetic energy transmitting device of claim 32, wherein the fourth winding is between the layer closest to the second winding among the winding layers of the third winding and the layer closest to the third winding among the winding layers of the second winding. Magnetic energy transfer device, characterized in that wound on

32. The magnetic energy transfer device of claim 31, wherein the coupling current flowing from the first winding and the third winding to the second winding by a coupling current generated by a potential difference between the fifth winding and the second winding; Magnetic energy transfer device characterized in that the difference from the coupling current flowing from the second winding to the fourth winding

37. The magnetic energy transfer device of claim 36, wherein the fourth winding is between a layer closest to the second winding among the winding layers of the third winding and a layer closest to the third winding among the winding layers of the second winding. Magnetic energy transfer device, characterized in that wound on

37. The magnetic energy transmitting device of claim 36, wherein the fourth winding is wound to face an opposite side of the side of the second winding that faces the first winding.

37. The magnetic energy transfer device of claim 36, wherein the fourth winding is wound around a portion of the same layer as the third winding wound between the first winding and the second winding.

30. The magnetic energy transmitting device of claim 29, wherein the first winding is wound to face the opposite side of the surface of the first winding that faces the second winding so that the first winding cannot be capacitively coupled to the core of the magnetic energy transmitting device. Magnetic energy transfer device further comprises a sixth winding shielding

42. The magnetic energy transmitting device of claim 40, wherein the sixth winding is part of the first winding.

30. The magnetic energy transmitting device of claim 29, wherein the first winding is wound to face the opposite side of the surface of the first winding that faces the second winding so that the first winding cannot be capacitively coupled to the core of the magnetic energy transmitting device. Shielding, and in spite of the shielding, a component in which the first winding is capacitively coupled to the core of the magnetic energy transfer element is capacitively coupled to the core of the magnetic energy transfer element at a voltage of reverse polarity with the first winding. Magnetic energy transfer device further comprises a sixth winding to cancel

43. The magnetic energy transfer element of any one of claims 1 to 42, which is used as a magnetic energy transfer element of a flyback converter type power supply.

43. The magnetic energy transfer element of any one of claims 1 to 42, which is used as a magnetic energy transfer element of a forward converter type power supply.

A flyback converter type power supply, comprising: a magnetic energy transfer element included in at least one of claims 1 to 42.

An article of manufacture comprising the flyback converter type power supply of claim 45.

A forward converter type power supply, comprising: a magnetic energy transfer element included in at least one of claims 1 to 42.

48. A manufactured article comprising the forward converter type power supply of claim 47.