JPH11345724A - Magnetic leakage type high-frequency transformer and inverter circuit using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance shielding effect by providing a core which magnetically couples a primary winding to a secondary winding through a gap and a magnetic material on the periphery to eliminate the need for being aware of the distance between a high-frequency transformer and an enclosure to accommodate an inverter circuit. SOLUTION: A primary winding 1 is wound around a primary bobbin 2, and a secondary winding 3 is wound around a secondary bobbin 4. The primary winding 1 and the secondary winding 3 are disposed at the legs of U-shaped cores 5. Two U-shaped cores 5 butt each other through core gaps 6 constructed by spacers of appropriate depth. And a magnetic material 7 is provided on such a periphery to confine high-frequency magnetic field generated at a device within the magnetic material 7, that is to shield the generated magnetic field. This allows greater part density and miniaturization of an inverter circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic leakage type high frequency transformer using a leakage magnetic flux and an inverter circuit using the magnetic leakage type high frequency transformer.

[0002]

2. Description of the Related Art A conventional magnetic leakage type high frequency transformer has a configuration as shown in FIG. That is, a primary winding 1 wound on a primary bobbin 2,
The secondary winding 3 wound around the secondary bobbin 4 is magnetically coupled by a core 5. At this time, core 5
Is inserted with a spacer 6 having an appropriate thickness, and the degree of coupling between the primary winding 1 and the secondary winding 3 is adjusted by this gap. As the above configuration, 1
Induction current flows through the secondary winding 3 according to the signal current supplied to the secondary winding 1. At this time, an appropriate amount of leakage magnetic flux is generated from the gap formed in the core 5 by the spacer 6. This leakage magnetic flux acts equivalently as a current-limiting inductor. Therefore, for example, when this kind of magnetic leakage type high-frequency transformer is used in an inverter circuit, there is an advantage that a current-limiting inductor is not required. Things.

[0003]

A conventional magnetic leakage type high frequency transformer or an inverter circuit using the magnetic leakage type high frequency transformer has a problem that it is difficult to adjust the amount of leakage magnetic flux. ing.

That is, when the leakage magnetic flux has a high frequency,
The housing 11 housing the inverter circuit is heated by induction heating. For this reason, it is necessary to take measures for the arrangement of the magnetic leakage type high frequency transformer, for example, to make the distance from the housing 11 sufficiently large. But in this case,
The size of the inverter circuit is inevitably increased, and the demand for downsizing cannot be met.

[0005]

SUMMARY OF THE INVENTION The present invention provides a magnetic leakage type high frequency transformer using a magnetic material as a magnetic shielding material, and when used as a circuit component of an inverter circuit, there is no need to be aware of the distance from the housing. This is a leakage type high frequency transformer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a magnetic material provided on an outer peripheral portion can shield a leakage magnetic flux generated from a gap between cores. This is a magnetic leakage type high frequency transformer which does not require consideration of the distance between the housing and the housing.

According to the second aspect of the present invention, the amount of leakage magnetic flux leaking to the outside can be further reduced by the non-magnetic metal plate further provided on the outer peripheral portion of the magnetic body, and the mounting rate of the circuit components of the inverter circuit to be used is reduced. This is a magnetic leakage type high-frequency transformer capable of increasing the power.

[0008] The invention described in claim 3 is a simple configuration in which a magnetic body is attached to the inside of a non-magnetic metal plate.
According to the present invention, there is provided a magnetic leakage type high frequency transformer capable of reducing the amount of leakage magnetic flux leaking to the outside and increasing the mounting rate of circuit components of an inverter circuit to be used.

According to a fourth aspect of the present invention, the magnetic material is arranged on the primary winding and the secondary winding, so that the magnetic material can be shielded at a position close to the gap between the cores and has a high shielding effect. This is a leakage type high frequency transformer.

According to a fifth aspect of the present invention, the magnetic material has a width equal to or larger than the winding width of the primary winding or the secondary winding, so that a leakage magnetic field from the winding can be shielded, and the shielding effect is high. This is a magnetic leakage type high frequency transformer.

According to a sixth aspect of the present invention, the primary and secondary windings can be insulated from the magnetic material by an insulating filler, and have a large heat capacity, a low temperature rise, and a high shielding effect. This is a high-frequency transformer.

According to a seventh aspect of the present invention, the non-magnetic metal plate is brought into contact with the primary winding and the secondary winding filled with an insulating material, thereby facilitating heat radiation of the heat generated from the winding and increasing the temperature. This is a magnetic leakage type high frequency transformer with low shielding and high shielding effect.

According to the invention described in claim 8, the non-magnetic metal plate is brought into contact with the core via an insulating filler so that the heat generated by the core can be easily radiated, the temperature rise is low, and the shielding effect is high. This is a high-frequency transformer.

According to the ninth aspect of the present invention, the slit provided in the non-magnetic metal plate acts to block the eddy current generated in the non-magnetic metal plate, thereby suppressing the temperature rise of the non-magnetic metal plate. This is a magnetic leakage type high-frequency transformer with low temperature rise and high shielding effect.

According to a tenth aspect of the present invention, the non-magnetic metal plate of the magnetic leakage type high frequency transformer is disposed so as to be in contact with the housing, and the heat of the magnetic leakage type high frequency transformer is radiated from the housing. In this case, the inverter circuit uses a magnetic leakage type high frequency transformer with a low temperature rise.

[0016]

(Embodiment 1) A first embodiment of the present invention will be described below. 1A and 1B show the configuration of the magnetic flux leakage type high frequency transformer of the present embodiment, wherein FIG. 1A is a cross-sectional view as viewed from a side, and FIG. 1B is a plan view as viewed from a top. The primary winding 1 is wound on a primary bobbin 2, and the secondary winding 3 is wound on a secondary bobbin 4. These primary windings 1 and 2
The secondary winding 3 is disposed on a leg of the core 5 having a U-shape. For the primary winding 1 and the secondary winding 3, a litz wire having a small loss with respect to a high-frequency current is used. The primary bobbin 2 and the secondary bobbin 4 are made of a high heat-resistant resin such as a glass epoxy material to ensure insulation from the core 5 even in a high temperature environment. Core 5
In this embodiment, the two-piece U-shape as shown in FIG. 1A is abutted, for example, through a core gap 6 formed by a spacer having an appropriate thickness. I'm using In this embodiment, the core 5
In this case, a ferrite having a small loss with respect to a high frequency is used. By appropriately setting the core gap 6, the degree of coupling between the primary winding 1 and the secondary winding 3 can be adjusted to an appropriate level, and the leakage magnetic flux leaking from the core gap 6 can be used as an inductor. Things. Further, by providing the core gap 6, even when used at a high frequency, saturation of the core 5 hardly occurs, and the core 5 can be downsized.

In this embodiment, FIGS. 1A and 1
As shown in (b), a magnetic body 7 is used in the outer peripheral portion. Ferrite is used for the magnetic body 7 like the core 5.

The operation of this embodiment will be described below. When a high-frequency current is supplied to the primary winding 1 in which a high-frequency current generating circuit (not shown) operates, the high-frequency current causes
Generates a high-frequency magnetic field corresponding to a change in current. This high frequency magnetic field generates an induced current in the secondary winding 3,
An inverter circuit using this magnetic leakage type high frequency transformer operates. At this time, as described above, the magnetic leakage type high frequency transformer has the core gap 6 and generates leakage magnetic flux. Since the leakage flux acts as an inductor, the inverter circuit does not need to use, for example, a current limiting inductor as a component.

At this time, in this embodiment, a magnetic leakage type high frequency transformer using the magnetic body 7 on the outer periphery is used. The magnetic body 7 acts so as to confine the high-frequency magnetic field generated from the device inside, that is, to shield the generated magnetic field. Therefore, for example, when the magnetic leakage type high frequency transformer of the present embodiment is used as a circuit component of the inverter circuit, the high frequency magnetic field leaking to the outside of the magnetic leakage type high frequency transformer becomes very small. For this reason, for example, it is possible to prevent the metal housing from generating heat due to an induced current flowing through the metal housing when a high-frequency leakage magnetic field is linked to the metal housing housing the inverter circuit. . In other words, when a magnetic leakage type high frequency transformer having a conventional configuration is used, the position of the magnetic leakage type high frequency transformer should be changed in order to prevent heat generation of the metal case due to linkage of the leakage magnetic field with the metal case. It must be sufficiently separated from the metal housing. In this respect, when the magnetic leakage type high frequency transformer of the present embodiment is used, since the magnetic body 7 is used on the outer peripheral portion, there is no need to restrict the arrangement position. Therefore, as the inverter circuit, the arrangement of components can be increased in density and the inverter circuit can be made compact.

As described above, according to the present embodiment, since the magnetic leakage type high frequency transformer having the magnetic member 7 arranged on the outer periphery is used, when used as a circuit component of the inverter circuit, the magnetic leakage type high frequency transformer can be used as a housing for accommodating the inverter circuit. There is no need to be aware of the distance between the components, and the inverter circuit can be arranged in a high density and can be made compact as an inverter circuit.

(Embodiment 2) Next, a second embodiment of the present invention will be described. FIG. 2 shows the configuration of the magnetic leakage type high frequency transformer of the present embodiment. FIG. 2A is a cross-sectional view as viewed from the side, and FIG. 2B is a plan view as viewed from the upper surface. That is, in this embodiment, the nonmagnetic metal plate 8 is arranged on the outer periphery of the magnetic body 7. The non-magnetic metal plate 8
In this embodiment, aluminum is used and short-circuited so as to form a closed circuit. However, it is not particularly necessary to form a closed circuit. Non-magnetic metal plate 8
In this embodiment, are arranged in a form insulated from the core 5 by the core supports 13 and 14 using a non-metallic material such as resin.

The non-magnetic metal plate 8 acts to demagnetize by short-circuiting the generated high-frequency magnetic field. In the present embodiment, since both the magnetic body 7 and the non-magnetic metal plate 8 described in the first embodiment are used, the amount of the high-frequency magnetic field leaking outside the magnetic leakage type high-frequency transformer is equal to that of the configuration of the first embodiment. It is much less than the one.

As described above, according to this embodiment, the magnetic material 7
A magnetic leakage type high-frequency transformer that can further reduce the amount of leakage magnetic flux leaking to the outside and increase the mounting rate of the circuit components of the inverter circuit to be used, by providing a nonmagnetic metal plate 8 on the outer peripheral portion of the transformer. Things.

(Embodiment 3) Next, a third embodiment of the present invention will be described. FIG. 3 is a side sectional view showing the configuration of the present embodiment. That is, in the present embodiment, the magnetic body 7 is attached to the inside of the non-magnetic metal plate 8 using an adhesive or the like.

With such a configuration, a member for supporting the magnetic body 7 is not particularly required, and a magnetic leakage type high frequency transformer having a simple configuration is realized. That is, according to the present embodiment, the amount of leakage magnetic flux leaking to the outside can be reduced with a simple configuration as a configuration in which the magnetic body 7 is attached to the inside of the non-magnetic metal plate 8, and the circuit components of the inverter circuit to be used can be reduced. It is intended to realize a magnetic leakage type high frequency transformer capable of increasing the mounting rate.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described. FIG. 4 shows the configuration of the magnetic leakage type high frequency transformer of the present embodiment. FIG. 4A is a cross-sectional view as viewed from the side, and FIG. 4B is a plan view as viewed from the upper surface. In this embodiment, the magnetic body 7 is arranged on the primary winding 1 and the secondary winding 3.

With such a configuration, the magnetic material 7 is located at a position close to the core gap 6 where the magnetic flux is most likely to leak.
Shielding is possible.

(Embodiment 5) Next, a fifth embodiment of the present invention will be described. FIG. 5 shows the configuration of the magnetic leakage type high frequency transformer of this embodiment. FIG. 5A is a cross-sectional view as viewed from the side, and FIG. 5B is a plan view as viewed from the upper surface. In this embodiment, the magnetic member 7 described in the fourth embodiment is used.
Is wider than the winding width of the primary winding 1 and the winding width of the secondary winding 3. For this reason, according to this embodiment, the leakage magnetic field from the core gap 7 and the leakage magnetic field from the primary winding 1 and the secondary winding 3 can be shielded, and a magnetic leakage type high-frequency transformer having a high shielding effect is realized. It is.

(Embodiment 6) Next, a sixth embodiment of the present invention will be described. FIG. 6 shows the configuration of the magnetic leakage type high frequency transformer of this embodiment. FIG. 6A is a cross-sectional view as viewed from the side, and FIG. 6B is a plan view as viewed from the upper surface. In this embodiment, the primary winding 1 and the secondary winding 3 are filled with an insulating filler 9 to insulate the magnetic body 7 from each other.

With this configuration, sufficient insulation between the primary winding 1 and the magnetic body 7 and between the secondary winding 3 and the magnetic body 7 can be ensured. At the same time, primary winding 1
The heat capacity of the secondary winding 3 is increased by filling with an insulating material. Therefore, the magnetic leakage type high frequency transformer of the present embodiment has the primary windings 1 and 2 due to heat generated during operation.
The temperature rise of the secondary winding 3 can be suppressed low.

As described above, according to this embodiment, the primary winding 1 and the secondary winding 3 can be insulated from the magnetic body 7 by the insulating filler 9, and the heat capacity can be increased to reduce the temperature rise. It is intended to realize a magnetic leakage type high frequency transformer having a high effect.

(Embodiment 7) Next, a seventh embodiment of the present invention will be described. FIG. 7 shows the configuration of the magnetic leakage type high frequency transformer of the present embodiment. FIG. 7A is a cross-sectional view as viewed from the side, and FIG. 7B is a plan view as viewed from the upper surface. In this embodiment, the non-magnetic metal plate 8 is
To contact the primary winding 1 and the secondary winding 3 which are filled.

With this configuration, heat generated in the primary winding 1 and the secondary winding 3 can be radiated to the magnetic body 7. As described above, according to the present embodiment, the heat generated from the windings is radiated to the non-magnetic metal plate 8 and the temperature rise is low.
This realizes a magnetic leakage type high frequency transformer having a high shielding effect.

(Embodiment 8) Next, an eighth embodiment of the present invention will be described. FIG. 8 shows the configuration of the magnetic leakage type high frequency transformer of the present embodiment. FIG. 8A is a cross-sectional view as viewed from the side, and FIG. 8B is a plan view as viewed from the upper surface. In this embodiment, the core 5 and the non-magnetic metal plate 7 are in contact with each other via the insulator 10. Insulator 10
Is preferably excellent in thermal conductivity. In this embodiment, silicone rubber is used.

With the above configuration, the heat generated by the core 5 is transmitted to the non-magnetic metal plate 7 and dissipated to the non-magnetic metal plate 7. The temperature of the core 5 is self-heating,
This rises due to the heat conduction of the heat generated by the primary winding 1 and the secondary winding 3. At this time, if the heat radiation of the core 5 is insufficient, the temperature rise of the core 5 sharply increases depending on the use conditions, and may exceed a specified value. In this respect, according to this embodiment, the core 5 and the non-magnetic metal plate 7
Is in contact with the non-magnetic metal plate 7 through the insulator 10.
Can be kept low.

As described above, according to the present embodiment, since the nonmagnetic metal plate 7 is brought into contact with the core 5 via the insulating filler, the heat generated by the core 5 can be easily radiated, the temperature rise is low, and the shield is reduced. A high-efficiency magnetic leakage type high frequency transformer can be realized.

(Embodiment 9) Next, a ninth embodiment of the present invention will be described. FIG. 9 is a perspective view showing the configuration of this embodiment. In this embodiment, the non-magnetic metal plate 8 is provided with a slit 17.
Is provided. The slits 17 are provided so as to prevent generation of the eddy current 18. In the present embodiment, a plurality of slits 17 are provided in the longitudinal direction of the nonmagnetic metal plate 8.

With the above configuration, even if the magnetic flux 12 is concentrated on the non-magnetic metal plate 8, the flow of the eddy current 18 can be blocked, and the temperature of the non-magnetic metal plate 8 can be prevented from rising. You can do it.

As described above, according to the present embodiment, the slit provided in the non-magnetic metal plate 8 acts to block the eddy current generated in the non-magnetic metal plate 8, and the temperature of the non-magnetic metal plate 8 rises. This realizes a magnetic leakage type high frequency transformer with a low temperature rise and a high shielding effect.

(Embodiment 10) Next, a tenth embodiment of the present invention will be described. FIG. 10 is a plan view showing the configuration of the inverter circuit of the present embodiment. Reference numeral 15 denotes a magnetic leakage type high frequency transformer described in each of the above embodiments, and reference numeral 16 denotes an inverter circuit using the magnetic leakage type high frequency transformer 15 as a circuit component. In the present embodiment, the inverter circuit 16 is housed in the metal housing 11. At this time, the magnetic leakage type high frequency transformer 15 is arranged so as to be in contact with the housing 11.

With the above configuration, heat generated by the magnetic leakage type high frequency transformer 15 is radiated to the metal housing 11. Therefore, the magnetic leakage type high frequency transformer 15 can suppress the temperature rise to be low, and the efficiency of the inverter circuit 16 becomes high. The magnetic leakage type high-frequency transformer 15 used at this time has a configuration in which the leakage magnetic flux leaking to the outside is reduced as described in each of the above-described embodiments. As described above, even when the housing 11 is placed in contact with the metal housing 11, the housing 11 does not generate heat due to induction heating.

As described above, according to the present embodiment, the non-magnetic metal plate 8 of the magnetic leakage type high frequency transformer 15 is disposed so as to be in contact with the housing 11, and the magnetic leakage type high frequency
By radiating the heat of No. 5 from the housing 11, it is possible to realize an inverter circuit using a magnetic leakage type high frequency transformer in which the temperature rise is suppressed to a low level.

[0043]

According to the first aspect of the present invention, a primary winding, a secondary winding receiving a magnetic flux of the primary winding, and the primary winding and the secondary winding via a gap. A magnetically coupled core;
A magnetic leakage type high-frequency transformer that does not require a user to be aware of the distance between the inverter circuit and the housing when used as a circuit component of the inverter circuit as a configuration having a magnetic body provided on the outer peripheral portion. It is.

According to a second aspect of the present invention, a primary winding;
A secondary winding receiving the magnetic flux of the primary winding;
A structure having a core magnetically coupled to the next winding via a gap, a magnetic body provided on the outer peripheral portion, and a non-magnetic metal plate provided on the outer peripheral portion of the magnetic body, the amount of leakage magnetic flux leaking to the outside And a magnetic leakage type high frequency transformer capable of increasing the mounting ratio of circuit components of an inverter circuit to be used.

According to a third aspect of the present invention, a magnetic material is attached to the inside of a non-magnetic metal plate.
An object of the present invention is to realize a magnetic leakage type high frequency transformer capable of reducing the amount of leakage magnetic flux leaking to the outside and increasing the mounting ratio of circuit components of an inverter circuit to be used.

According to a fourth aspect of the present invention, the magnetic material is arranged on the primary winding and the secondary winding, so that the magnetic material can be shielded at a position close to the gap between the cores and has a high shielding effect. This realizes a leakage type high frequency transformer.

According to a fifth aspect of the present invention, the magnetic material has a width larger than the winding width of the primary winding or the secondary winding, so that a magnetic field leaking from the winding can be shielded, and a magnetic effect having a high shielding effect can be obtained. This realizes a leakage type high frequency transformer.

According to a sixth aspect of the present invention, the primary winding and the secondary winding are insulated by an insulating filler so that the magnetic body can be insulated from each winding, and the heat capacity can be increased to increase the temperature. This realizes a magnetic leakage type high frequency transformer having a low rise and a high shielding effect.

According to a seventh aspect of the present invention, the non-magnetic metal plate is configured to be in contact with the primary winding and the secondary winding so that heat generated from the windings can be easily radiated and the temperature rise is low. This realizes a magnetic leakage type high frequency transformer having a high shielding effect.

According to the present invention, the non-magnetic metal plate is in contact with the core via an insulating filler.
The object of the present invention is to realize a magnetic leakage type high frequency transformer that can easily radiate heat generated by the core, has a low temperature rise, and has a high shielding effect.

According to the ninth aspect of the present invention, the non-magnetic metal plate has a slit for blocking an eddy current, so that the temperature rise of the non-magnetic metal plate can be suppressed low, and the temperature rise and the shielding effect can be reduced. It realizes a high magnetic leakage type high frequency transformer.

According to a tenth aspect of the present invention, there is provided the magnetic leakage type high frequency transformer according to any one of the first to ninth aspects, and an inverter circuit using the magnetic leakage type high frequency transformer as a circuit component, The non-magnetic metal plate of the magnetic leakage type high frequency transformer is configured to be in contact with a housing for accommodating the inverter circuit, so that heat generated by the magnetic leakage type high frequency transformer is radiated from the housing, and the temperature rise is suppressed low. An object of the present invention is to realize an inverter circuit that can use a leakage type high frequency transformer.

[Brief description of the drawings]

FIG. 1A is a side sectional view illustrating a configuration of a magnetic leakage type high frequency transformer according to a first embodiment of the present invention. FIG.

FIG. 2A is a side sectional view illustrating a configuration of a magnetic leakage type high-frequency transformer according to a second embodiment of the present invention. FIG.

FIG. 3 is a side sectional view illustrating a configuration of a magnetic leakage type high frequency transformer according to a third embodiment of the present invention.

FIG. 4 (a) is a side sectional view illustrating the configuration of a magnetic leakage type high frequency transformer according to a fourth embodiment of the present invention.

FIG. 5 (a) is a side sectional view illustrating the configuration of a magnetic leakage type high frequency transformer according to a fifth embodiment of the present invention.

FIG. 6A is a side sectional view illustrating the configuration of a magnetic leakage type high frequency transformer according to a sixth embodiment of the present invention; FIG.

FIG. 7A is a side sectional view illustrating the configuration of a magnetic leakage type high-frequency transformer according to a seventh embodiment of the present invention. FIG.

FIG. 8A is a sectional side view illustrating the configuration of a magnetic leakage type high frequency transformer according to an eighth embodiment of the present invention. FIG.

FIG. 9 is a perspective view illustrating the configuration of a magnetic leakage type high frequency transformer according to a ninth embodiment of the present invention.

FIG. 10 is a plan view illustrating the configuration of an inverter circuit according to a tenth embodiment of the present invention.

FIG. 11 is a side sectional view illustrating a configuration of a conventional high-frequency transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Primary winding 3 Secondary winding 5 Core 6 Core gap 7 Magnetic material 8 Nonmagnetic metal plate 9 Insulation filler 10 Insulator 15 High frequency transformer 16 Inverter circuit 17 Slit

Continued on the front page (72) Inventor Shoji Ohashi 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshimi Iwamoto 1006 Oji Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Person Hideki Omori 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture (72) Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Takafumi Tanase 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 1006 Kadoma Matsushita Electric Industrial Co., Ltd.

Claims (10)

[Claims] A primary winding and a secondary winding receiving a magnetic flux of the primary winding.
A magnetic leakage type high frequency transformer comprising: a secondary winding; a core for magnetically coupling the primary winding and the secondary winding via a gap; and a magnetic body provided on an outer peripheral portion. 2. A primary winding and a secondary winding receiving a magnetic flux of the primary winding.
A secondary winding, a core for magnetically coupling the primary winding and the secondary winding via a gap, a magnetic body provided on an outer peripheral portion, and a non-magnetic metal plate provided on an outer peripheral portion of the magnetic body. Magnetic leakage type high frequency transformer. 3. The magnetic leakage type high frequency transformer according to claim 2, wherein a magnetic material is attached to the inside of the non-magnetic metal plate. 4. The magnetic leakage type high frequency transformer according to claim 1, wherein the magnetic material is disposed on the primary winding and the secondary winding. 5. The magnetic leakage type high frequency transformer according to claim 4, wherein the magnetic material has a width equal to or larger than a winding width of the primary winding or the secondary winding. 6. The magnetic leakage high-frequency transformer according to claim 1, wherein the primary winding and the secondary winding are insulated by an insulating filler. 7. The magnetic leakage type high frequency transformer according to claim 6, wherein the non-magnetic metal plate is in contact with the primary winding and the secondary winding. 8. The magnetic leakage type high frequency transformer according to claim 6, wherein the non-magnetic metal plate is in contact with the core via an insulating filler. 9. The magnetic leakage type high frequency transformer according to claim 2, wherein the non-magnetic metal plate has a slit for blocking an eddy current. 10. A magnetic leakage type high frequency transformer comprising: the magnetic leakage type high frequency transformer according to claim 1; and an inverter circuit using the magnetic leakage type high frequency transformer as a circuit component. The nonmagnetic metal plate is an inverter circuit that comes in contact with the housing that houses the inverter circuit.