JP3563455B2 - Generator coil device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a power generation coil device. More specifically, it has a transformer in which a primary coil and a secondary coil are wound around a transformer core, and an external magnet disposed in contact with a part of the transformer core to reduce input / output conversion efficiency. The present invention relates to a power generation coil device that can be improved.
[0002]
[Prior art]
When the voltage is stepped up by a transformer for voltage conversion, usually, the number of turns N2 of the secondary coil must be larger than the number of turns N1 of the primary coil, and the entire transformer becomes large. Therefore, if the entire transformer becomes large, the weight becomes large, so that it is difficult to handle and transport the transformer, and there is a problem that the cost is also increased.
In order to solve such a problem, the inventor of the present application has proposed a new stationary type power generating coil device in Japanese Patent Application No. 5-117681.
A static power generating coil device according to the above proposal includes a transformer in which a primary coil and a secondary coil are wound around separate leg iron cores of a transformer iron core, and both ends of the primary coil side leg iron core. External magnets disposed at (or near) the N-pole and the S-pole in contact with each other, and the direction of the input current flowing through the primary coil is determined by the direction of the magnetic flux generated in the iron core on the primary coil side leg. The direction is set so as to be opposite to the direction of the magnetic flux that goes straight from the N pole to the S pole of the external magnet.
[0003]
Assuming that the operation principle of this power generation coil device is that the input voltage is intermittently supplied to the primary coil, almost all of the magnetic flux from the N pole to the S pole of the external magnet during the non-supply period of the input voltage is the primary coil. Few magnetic fluxes pass through the side leg core and bypass the secondary coil side leg core.
On the other hand, during the input voltage supply period, the magnetic flux generated by the primary coil circulates from inside the primary coil side leg core, through the transformer iron core, and through the secondary coil side leg core. pass. In this case, the iron core of the primary coil side leg is almost magnetically saturated, and the magnetic resistance in the iron core of the primary coil side leg increases from the viewpoint of the external magnet. Therefore, the magnetic flux from the N pole to the S pole of the external magnet is , Almost all bypass the inside of the iron core on the secondary coil side.
Therefore, as the input current flows intermittently through the primary coil, the amount of change in the magnetic flux that intersects the secondary coil substantially increases by the amount of the magnetic flux of the external magnet. Induced by the coil.
It is desirable that the magnetic flux passing through the iron core on the primary coil side leg be saturated when the primary coil is energized. In other words, when the magnetic flux of the primary coil side leg core becomes saturated due to the energization of the primary coil, all the magnetic flux generated by the external magnet passes through the secondary coil side leg core, and the magnetic flux generated by the external magnet This can be used effectively. To this end, if the iron cores are made of the same material, it is desirable that the cross-sectional area of the iron core on the primary coil side be formed to be smaller than the cross-sectional areas of the other portions.
[0004]
In this way, the primary coil has a role of inducing an electromotive force in the secondary coil and a role of a switch for switching the direction of the magnetic flux generated by the external magnet, thereby effectively utilizing the magnetic flux generated by the external magnet. Thus, it is possible to realize a stationary type power generating coil device that takes out in the form of electric energy.
Therefore, it is possible to increase the voltage without increasing the turns ratio N2 / N1. Of course, if the turns ratio is increased, further boosting is possible.
By the way, in the above-described power generation coil device, the direction of the magnetic flux intermittently passing through the inside of the primary coil side leg core and the inside of the secondary coil side leg core is one direction, and is caused by the hysteresis phenomenon of the iron core. Affected by remanence. As a result, the excitation current waveform is distorted, iron loss is caused by the iron loss current, and improvement in input / output conversion efficiency is impeded.
[0005]
[Problems to be solved by the invention]
The present invention has been made to solve the problem that the currently proposed power generation coil device is affected by residual magnetism as described above, and a stationary power generation device capable of greatly improving input / output conversion efficiency. It is an object to provide a coil device.
[0006]
[Means for Solving the Problems]
A power generating coil device according to the present invention includes a transformer iron core having an annular magnetic path having a substantially C-shape in a plane, a pair of first outer leg portions and a pair of first outer leg portions facing each other along inner leg portions of the transformer iron core. A first primary coil and a second primary coil respectively wound around the outer legs of the first and second outer legs, a secondary coil wound around the inner legs, and an outer portion of the transformer core. A first external magnet having a pair of north and south poles abutting on or near both ends in the longitudinal direction of the first outer leg, and also disposed outside the transformer core. And a pair of N-poles and S-poles abutting on or near both ends in the length direction of the second outer leg, and the polarity of the pair is the same as the polarity of the first N-pole and S-pole. A second external magnet set to be in a direction opposite to the direction.
[0007]
[Action]
In using the power generation coil device of the present invention, the first primary coil and the second primary coil are alternately supplied with an input current, and the first primary coil is connected to the N pole to the S pole of the first external magnet. The input current is supplied in a direction that generates a magnetic flux in the outer leg portion in a direction opposite to the direction of the magnetic flux flowing through the shortest magnetic path, and the second primary coil is connected to the N pole of the second external magnet from the N pole of the second external magnet. It is assumed that the input current is supplied in a direction that generates a magnetic flux in the outer leg portion in a direction opposite to the direction of the magnetic flux directed to the pole via the shortest magnetic path.
When an input current is applied only to the first primary coil, the first magnetic flux generated by the first primary coil passes from the inside of the first outer leg to the inside of the inner leg. In this case, the first outer leg becomes substantially magnetically saturated, and the magnetic resistance in the first outer leg increases when viewed from the first external magnet. Almost all of the oncoming magnetic flux bypasses the inner leg. At this time, since the second primary coil does not generate a magnetic flux, the magnetic resistance in the second outer leg becomes low as viewed from the second external magnet, so that the magnetic flux from the N pole to the S pole of the second external magnet is reduced. Almost all pass through the second outer leg from the north pole to the south pole via the shortest magnetic path.
On the other hand, when the input current is applied only to the second primary coil, the second magnetic flux generated by the second primary coil passes from the second outer leg to the inner leg so as to circulate. In this case, the second outer leg is substantially magnetically saturated, and the magnetic resistance in the second outer leg is high when viewed from the second external magnet. Almost all of the oncoming magnetic flux bypasses the inner leg. At this time, since the first primary coil does not generate a magnetic flux, the magnetic resistance in the first outer leg portion becomes low when viewed from the first external magnet, so that the magnetic flux of the first external magnet from the north pole to the south pole is reduced. Almost all pass through the first outer leg from the north pole to the south pole via the shortest magnetic path.
[0008]
Therefore, the direction of the first magnetic flux that intersects with the secondary coil as the input current flows through the first primary coil, and the direction of the first magnetic flux that intersects with the secondary coil as the input current flows through the second primary coil. 2, and the magnetic flux intersecting the secondary coil is substantially increased by the magnetic flux of the first external magnet or the magnetic flux of the second external magnet. Is induced in the secondary coil, and an AC output is obtained. As a result, the amount of change in the magnetic flux that intersects with the secondary coil becomes approximately twice as large as the amount of change in the magnetic flux that intersects with the secondary coil when the input current flows intermittently through one primary coil. It is possible to boost the voltage without increasing N2 / N1.
[0009]
In addition, as described above, the first and second primary coils are alternately driven, so that the first magnetic flux and the second magnetic flux passing through the inner leg portion are in opposite directions. Also, the first magnetic flux passing through the inside of the first outer leg when the first primary coil is driven and the shortest magnetic path from the N pole to the S pole of the first external magnet through the shortest magnetic path when the second primary coil is driven. In the direction opposite to the magnetic flux passing through the first outer leg. Similarly, the second magnetic flux passing through the inside of the second outer leg when the second primary coil is driven and the shortest magnetic path from the N pole to the S pole of the second external magnet when driving the first primary coil. In the direction opposite to the magnetic flux passing through the second outer leg.
As a result, the effect of residual magnetism due to the hysteresis phenomenon of the transformer iron core is almost eliminated, the distortion of the exciting current waveform is reduced, the iron loss due to the iron loss current is suppressed, and the input / output conversion efficiency is improved. Becomes possible. That is, it is possible to greatly improve the input / output conversion efficiency by utilizing the operation principle of the currently proposed stationary power generation coil device according to the present inventors' invention.
[0010]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a configuration of a power generating coil device according to one embodiment of the present invention, and a transformer portion is taken out and shown in FIG.
This power generating coil device includes a transformer 10, a first external magnet 1, and a second external magnet 2.
[0011]
The transformer 10 includes a transformer core 11 having an annular magnetic path having a substantially sun-shaped planar shape, and a pair of first outer legs 111 opposed along the inner leg 110 of the transformer core 11. A first primary coil 21 and a second primary coil 22 are respectively wound around the first and second outer legs 112, and a secondary coil 23 is wound around the inner leg 110.
[0012]
It is desirable that the transformer core 11 be formed by combining the inner leg 110, the first outer leg 111, and the second outer leg 112 with separate members. Further, assuming that the first outer leg 111 and the second outer leg 112 are made of the same material as the other parts, the cross-sectional area of the first outer leg 111 and the second outer leg 112 is The first outer leg 111 is connected to the inner leg 110, the second outer leg 112 is connected to the inner leg 110, and the inner leg 110 is formed to have a smaller cross-sectional area. It is desirable to keep.
[0013]
The first external magnet 1 is disposed outside the transformer core 11, and has a pair of N poles abutting on both ends (or in the vicinity thereof) in the longitudinal direction of the first outer leg 111. It has an S pole.
The second external magnet 2 is also disposed outside the transformer iron core 11 and has a pair of N poles abutting on both ends (or in the vicinity) of the second outer leg 112 in the longitudinal direction. And the polarity of the S pole is set so that the direction of the polarity is opposite to the direction of the polarity of the N pole and the S pole of the first external magnet 1.
[0014]
In this example, each of the external magnets 1 and 2 is, for example, a substantially horseshoe-shaped permanent magnet from the viewpoint of easy handling. In this case, the facing distance between the N pole and the S pole of the first permanent magnet 1 and the facing distance between the N pole and the S pole of the second permanent magnet 2 are respectively equal to the first outer leg portions 111 of the transformer core 11. And the length L of the second outer leg 112.
The transformer iron core 11 has, for example, a structure in which thin silicon steel sheets are stacked, and has a layered structure in which a plurality of silicon steel sheets having appropriate shapes are stacked in consideration of ease of assembly, structural strength, and the like. Is adopted.
[0015]
In this example, as shown in FIGS. 3A and 3B, a layer in which a single plane I-shaped silicon steel sheet 33 is sandwiched between a pair of silicon steel sheets 31 and 32 each having a plane U-shape on the same plane. As shown in FIG. 3C, a layered structure in which a pair of silicon steel plates 36 having a flat H shape sandwiched on the same surface by a pair of silicon steel plates 34 and 35 each having a U-shape in a plane is alternately stacked as shown in FIG. Is adopted.
[0016]
4A and 4B show another example of an assembly structure of the transformer iron core 11 in FIG. This transformer iron core is composed of a pair of flat U-shaped silicon steel plates 41 and 42 each sandwiching the opening side and the back side of one flat U-shaped silicon steel plate 43 on the same plane, As shown in FIG. 4 (c), a layer in which a pair of U-shaped silicon steel plates 44 and 45 sandwich one planar U-shaped silicon steel plate 46 on the same surface in the opposite direction to the above is alternately stacked. It adopts a stratified structure.
[0017]
Next, the operating principle of the power generation coil device of the above embodiment will be described with reference to FIGS. 5 and 6 by taking the case where the power generation coil device is used as, for example, a DC / AC inverter.
[0018]
In the power generation coil device of the above embodiment, the direction of the first magnetic flux φ1 generated in the first outer leg portion 111 can be freely set according to the winding method of the first primary coil 21 and the direction in which the exciting current flows. Similarly, the direction of the second magnetic flux φ2 generated in the second outer leg portion 112 can be freely set according to the winding method of the second primary coil 22 and the direction in which the exciting current flows. For example, it is assumed that a pulse voltage or a half-wave rectified voltage is alternately supplied to the first primary coil 21 and the second primary coil 22. In this example, as shown in FIG. 1, the changeover switch circuit 5 switches the output electrodes of the dry cell 4 to the first primary coil 21 and the second primary coil 22 alternately, for example, every 1/120 second. , A pulse voltage is applied to the first primary coil 21 and the second primary coil 22 alternately.
[0019]
In this case, in the first cycle in which the input voltage is supplied to the first primary coil 21, the first magnetic flux φ1 generated in the first outer leg 111 by the first primary coil 21 becomes the first external magnetic flux φ1. The direction of the input current of the first primary coil 21 is set so as to be opposite to the direction of the magnetic flux Φ1 from the N pole to the S pole of the magnet 1 via the shortest magnetic path (in this example, linearly). I do.
In the second cycle of supplying the input voltage to the second primary coil 22, the second magnetic flux φ2 generated in the second outer leg 112 by the second primary coil 22 is generated by the second external magnet The direction of the input current of the second primary coil 22 is set so as to be opposite to the direction of the magnetic flux Φ2 that goes from the N pole of No. 2 to the S pole via the shortest magnetic path (in this example, linearly). .
[0020]
That is, as shown in FIG. 5, for example, when a pulse voltage is applied only to the first primary coil 21 and an input current flows, almost all of the first magnetic flux φ1 generated by the first primary coil 21 1 so as to circulate from inside the outside leg 111 to inside the inside leg 110 (note that leakage magnetic flux is neglected).
In this case, the first outer leg 111 is substantially in a magnetically saturated state, and the magnetic resistance in the first outer leg 111 increases when viewed from the first external magnet 1. Almost all the magnetic flux Φ1 from the pole to the south pole bypasses the inside of the inner leg 110.
[0021]
Here, the leg through which a large amount of magnetic flux composed of the magnetic fluxes φ1 and φ1 passes has a cross-sectional area of the first outer leg portion so as not to be saturated in a range smaller than the magnetic flux (φ1 + φ1). It is desirable that the cross-sectional area be larger than 111.
[0022]
Also, at this time, since the second primary coil 22 does not generate a magnetic flux, the magnetic resistance in the second outer leg 112 decreases when viewed from the second external magnet 2. Almost all of the magnetic flux Φ2 from the pole to the south pole passes straight through the inside of the second outer leg 112.
[0023]
On the other hand, as shown in FIG. 6, when a pulse voltage is applied only to the second primary coil 22 and an input current flows, almost all of the second magnetic flux φ2 generated by the second primary coil 22 is generated. Circulates from inside the second outer leg 112 to inside the inner leg 110 (the leakage flux is neglected).
In this case, the second outer leg 112 is substantially in a magnetically saturated state, and the magnetic resistance in the second outer leg 112 is high when viewed from the second external magnet 2. Almost all the magnetic flux Φ2 going from the pole to the south pole bypasses the inside of the inner leg 110.
[0024]
Here, the leg through which a large amount of magnetic flux composed of the magnetic fluxes φ2 and φ2 passes has a cross-sectional area of the second outer leg to prevent saturation in a range smaller than the magnetic flux (φ2 + φ2). It is desirable that the cross-sectional area be larger than 112.
[0025]
At this time, since the first primary coil 21 does not generate magnetic flux, the magnetic resistance in the first outer leg 111 decreases when viewed from the first external magnet 1. Almost all of the magnetic flux Φ1 from the pole to the south pole passes straight through the first outer leg 111.
[0026]
Therefore, the direction of the first magnetic flux φ1 crossing the secondary coil 23 with the input current flowing through the first primary coil 21 and the secondary coil with the input current flowing through the second primary coil 22 The direction of the second magnetic flux φ2 that intersects with the magnetic flux 23 is opposite to the direction of the second magnetic flux φ2. And an electromotive force corresponding to these magnetic flux changes is induced in the secondary coil 23, and an AC output is obtained.
In this case, the amount of change in the magnetic flux that intersects with the secondary coil 23 is twice the amount of change in the magnetic flux φ1 or φ2 that intersects with the secondary coil 23 when the input current flows intermittently through one primary coil 21 or 22. About the size.
[0027]
Further, as described above, the first primary coil 21 and the second primary coil 22 are alternately driven, so that the first magnetic flux φ1 and the second magnetic flux φ2 that pass through the inside Turns in the opposite direction. The first magnetic flux φ1 passing through the inside of the first outer leg portion 111 when the first primary coil 21 is driven, and the N pole of the first external magnet 1 is changed from the N pole to the S pole when the second primary coil 22 is driven. The direction is linearly opposite to the magnetic flux Φ1 that passes through the inside 111 of the first outer leg. Similarly, the second magnetic flux φ2 passing through the second outer leg 112 when the second primary coil 22 is driven, and the N-pole to the S-pole of the second external magnet 2 when the first primary coil 21 is driven. The direction of the magnetic flux Φ2 which passes through the inside of the second outer leg portion 112 in a straight line is opposite to that of the magnetic flux Φ2.
[0028]
Thus, while utilizing the operating principle of the stationary type power generating coil device according to the present invention of the present inventor, which is currently proposed, the effect of the residual magnetism due to the hysteresis phenomenon of the transformer core 11 is almost eliminated, and the excitation It is possible to reduce distortion of the current waveform, suppress iron loss due to iron loss current, and improve input / output conversion efficiency.
[0029]
In the above operation, the inner leg 110, the first outer leg 111, and the second outer leg 112 are formed of separate members, and the iron core on the primary coil side and the iron core on the secondary coil side are formed. By cutting off the edge of the material, the amount of the magnetic flux Φ1 of the first external magnet 1 going to the second outer leg portion 112 decreases, and the magnetic flux Φ2 of the second external magnet 2 decreases The amount going to the outer leg 111 is reduced. As a result, the magnetic fluxes Φ1 and Φ2 can be effectively used, which can contribute to an improvement in conversion efficiency.
[0030]
Next, the degree of improvement of the input / output conversion efficiency of the power generation coil device of the above embodiment will be specifically described.
FIG. 7 shows an example of a measurement system when the input / output conversion efficiency is measured. In this measurement system, a commercial AC power supply of, for example, 60 Hz, 100 V is obtained by half-wave rectification using an AC adapter 72 and two rectifiers 73 and 74 in a state where a load resistor 71 is connected to the secondary coil 23. The applied voltage was alternately applied to the first primary coil 21 and the second primary coil 22.
In this measurement, when the value of the load resistor 71 is changed by several points, for example, the input current and the input voltage of the first primary coil 21 are measured by the ammeter 75 and the voltmeter 76, respectively. FIG. 8 shows a list of calculation results of the input power, the output power, and the input / output conversion efficiency, as a result of measuring the output current and the output voltage with the ammeter 77 and the voltmeter 78.
[0031]
For comparison, the measurement results and the calculation results are also shown for the case where the external magnets (the first external magnet 1 and the second external magnet 2) were removed.
FIG. 9 is a characteristic diagram showing the measurement results of the load resistance versus the input current in FIG.
FIG. 10 is a characteristic diagram showing a measurement result of load resistance versus output voltage in FIG.
FIG. 11 is a characteristic diagram showing measurement results of load resistance versus output current in FIG.
FIG. 12 is a characteristic diagram showing a calculation result of input power versus output power in FIG.
FIGS. 13 (a) and 13 (b) show an example of the result of observation with an oscilloscope in order to confirm the input waveform and the output waveform at the time of the above measurement.
[0032]
From the above results, it can be seen that, according to the power generation coil device of the present embodiment, the input / output conversion efficiency is greatly improved by about 250% or more compared to the case where no external magnet is used.
Further, according to the structure of the power generation coil device of the above embodiment, the coils 21, 22, and 23 are separately wound around three parallel legs (iron cores) 111, 110, and 112, and the two outer legs are formed. Since the substantially horseshoe-shaped permanent magnets 1 and 2 abut against the legs so as to face each other, the overall size is compact.
[0033]
In addition, as the external magnets 1 and 2 in the above embodiment, various magnets such as a superconducting electromagnet can be used in addition to the permanent magnets.
Further, the shape of the transformer iron core 11 in the above-described embodiment does not have to be exactly the plane of the sun, but may be a case where a part of the sun is curved or a part of the sun is protruded. The shape of the transformer iron core in the present invention may be any shape as long as a part of each of the two annular magnetic paths is continuous.
[0034]
Further, in the above-described embodiment, an example is shown in which the first primary coil 21 and the second primary coil 22 are wound around substantially the entire area of the first outer leg 111 and the second outer leg 112, respectively. However, the present invention is not limited to this. As shown in FIG. 14, the first outer leg portion 111 and the second outer leg portion 112 each have a region corresponding to a case where an input current is supplied alternately to a part of each region. You may change so that it may wind only the quantity required to block the magnetic flux of the 1st external magnet 1 and the 2nd external magnet 2. FIG.
[0035]
Further, in each of the above embodiments, an example is shown in which a pair of opposing sides along the inner leg is used as the first outer leg and the second outer leg of the transformer core. However, the present invention is not limited to this. When a part of each outer leg on both sides of the inner leg of the transformer core is used as the first outer leg and the second outer leg, the first primary in the first outer leg is also used. A pair of N and S poles of the first external magnet are brought into contact near both ends of the coil, and a pair of N poles of the second external magnet are placed near both ends of the second primary coil in the second outer leg. When the pole and the S pole are brought into contact with each other, substantially the same effects as in the above embodiment can be obtained by the same operation principle as in the above embodiment. However, in this case, when an input current is supplied to the first primary coil, a magnetic flux in a direction opposite to the direction of the magnetic flux directed from the N pole to the S pole of the first external magnet via the shortest path is transmitted to the first outer magnet. A second magnetic flux is generated in the leg portion, and when the input current is supplied to the second primary coil, the magnetic flux in the direction opposite to the direction of the magnetic flux flowing from the N pole to the S pole of the second external magnet via the shortest magnetic path is converted to the second magnetic flux. And the direction in which the magnetic flux generated by the first primary coil passes through the inner leg and the direction in which the magnetic flux generated by the second primary coil passes through the inner leg is reversed. It is necessary to arrange the first primary coil and the second primary coil.
[0036]
【The invention's effect】
As described above, according to the power generation coil device of the present invention, the conversion efficiency of input / output can be greatly improved, so that it can be used in all fields such as home use and industrial use.
[Brief description of the drawings]
FIG. 1 is a configuration explanatory view showing a power generating coil device according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a transformer portion in FIG.
FIG. 3 is a plan view and a side view showing an example of an assembly structure of the transformer iron core in FIG. 1;
FIG. 4 is a plan view and a side view showing another example of an assembling structure of the transformer iron core in FIG. 1;
FIG. 5 is a view for explaining a flow of magnetic flux in a first cycle in an operation state of the power generation coil device of FIG. 1;
FIG. 6 is a view for explaining a flow of magnetic flux in a second cycle in an operation state of the power generation coil device of FIG. 1;
FIG. 7 is a circuit diagram showing an example of a measurement system when measuring the input / output conversion efficiency of the power generation coil device of FIG. 1;
8 is a diagram showing an example of a list of measurement results and calculation results obtained by the measurement system of FIG. 7;
FIG. 9 is a characteristic diagram showing measurement results of load resistance versus input current in FIG.
FIG. 10 is a characteristic diagram showing measurement results of load resistance versus input voltage in FIG.
FIG. 11 is a characteristic diagram showing measurement results of load resistance versus output current in FIG.
FIG. 12 is a characteristic diagram showing a calculation result of input power versus output power in FIG.
FIG. 13 is a waveform chart showing an example of an input waveform and an output waveform observed during measurement by the measurement system of FIG. 7;
FIG. 14 is a plan view showing a modification of the power generation coil device of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st external magnet 2 2nd external magnet 10 Transformer 11 Transformer iron core 110 Inner leg 111 First outer leg 112 Second outer leg 21 First primary coil 22 Second primary coil 23 Secondary coil

Claims (3)

A transformer iron core having a planar substantially sun-shaped annular magnetic path,
A first primary coil and a second primary coil wound corresponding to a pair of the first outer leg and the second outer leg facing the inner leg of the transformer core, respectively; ,
A secondary coil wound around the inner leg,
A first external magnet disposed outside the transformer core and having a pair of north and south poles abutting on or near both longitudinal ends of the first outer leg;
The second outer leg has a pair of N-poles and S-poles which are disposed outside the iron core of the transformer and abut at or near both ends in the longitudinal direction of the second outer leg. A power generating coil device comprising: a second external magnet set so as to have a direction opposite to the polarities of the N pole and the S pole of the first external magnet. The first primary coil and the second primary coil are alternately supplied with an input current, and the first primary coil goes from the north pole to the south pole of the first external magnet via a shortest path. An input current is supplied in a direction to generate a magnetic flux in a direction opposite to the direction of the magnetic flux in the first outer leg, and the second primary coil is connected to the second external magnet from the north pole to the shortest pole to the south pole. The power generation coil device according to claim 1, wherein the input current is supplied in a direction in which a magnetic flux in a direction opposite to a direction of the magnetic flux flowing through the magnetic path is generated in the second outer leg. In the transformer core, a cross-sectional area of the first outer leg and the second outer leg is such that a cross-sectional area of the first outer leg and the second outer leg is continuous with the inner leg and the second outer leg. 3. The power generating coil device according to claim 1, wherein a cross-sectional area of a leg connected to the inner leg and the inner leg is smaller than a cross-sectional area of the inner leg.

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