JP5690572B2 - Trance - Google Patents

Description

  The present invention relates to a transformer incorporated in a DC-DC converter or the like.

Some DC-DC converters that perform DC power voltage conversion use a transformer.
For example, as shown in FIG. 11, the transformer is mounted and fixed on a base plate 6 made of a metal plate such as aluminum. Then, as the transformer 9, the lower core 2 made of a magnetic material disposed on the base plate 6, at least a pair of upper cores 3 made of a magnetic material opposed to the upper surface of the lower core 2, the lower core 2 and the upper There exists what consists of the primary coil 41 and the secondary coil 42 arrange | positioned between the cores 3 (patent document 1).

The upper core 3 is in contact with the lower core 2 on the outer side of the primary coil 41 and the secondary coil 42, and the vertical gap 11 is provided between the lower coil 2 and the inner side of the primary coil 41 and the secondary coil 42. The pair of upper cores 3 are extended from the outer side to the inner side of the primary coil 41 and the secondary coil 42 in a direction approaching each other, and an upper gap 12 is provided between the opposing surfaces.
Thereby, the magnetic path which passes the inner side and the outer side of the primary coil 41 and the secondary coil 42 is constituted by the lower core 2 and the upper core 3, and magnetic saturation is prevented by the upper and lower gaps 11.

JP 2005-51995 A

  However, in the transformer 1, since the upper and lower gaps 11 exist between the lower core 2 and the upper core 3, as shown in FIG. 12, when the ripple current flows through the primary coil 41 and the magnetic flux φ fluctuates, In the gap 11, an electromagnetic attractive force F attracting each other acts between the lower core 2 and the upper core 3, and the magnitude of the electromagnetic attractive force F varies. Thereby, in the upper and lower gap 11, the upper core 3 and the lower core 2 vibrate so as to approach or move away from each other (arrow V). This vibration causes noise (vibration sound). That is, this vibration propagates through the base plate 6 to the vehicle compartment or the like of the vehicle on which the DC-DC converter is mounted and becomes noise.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a transformer that suppresses vibration.

According to a first aspect of the present invention, there is provided a lower core made of a magnetic body disposed on a base plate, at least a pair of upper cores made of a magnetic body disposed opposite to the surface of the lower core opposite to the base plate, and the lower core A transformer composed of a primary coil and a secondary coil arranged between a core and the upper core, and fixed to the base plate,
The upper core is in contact with the lower core on the outer side of the primary coil and the secondary coil, and an upper and lower gap is provided between the lower coil and the inner side of the primary coil and the secondary coil,
The pair of upper cores extend from the outer side to the inner side of the primary coil and the secondary coil in a direction approaching each other and provide an upper gap between the opposing surfaces.
A spacer made of a nonmagnetic material is interposed in the upper gap,
The spacer connects the pair of upper cores ,
The lower core is a transformer characterized in that it is divided into a plurality of parts in a direction orthogonal to the direction in which the pair of upper cores are arranged and in the vertical direction .

According to a second aspect of the present invention, there is provided a lower core composed of a magnetic body disposed on a base plate, at least a pair of upper cores composed of a magnetic body disposed opposite to the surface of the lower core opposite to the base plate, and the lower core. A transformer composed of a primary coil and a secondary coil arranged between a core and the upper core, and fixed to the base plate,
The upper core is in contact with the lower core on the outer side of the primary coil and the secondary coil, and an upper and lower gap is provided between the lower coil and the inner side of the primary coil and the secondary coil,
The pair of upper cores extend from the outer side to the inner side of the primary coil and the secondary coil in a direction approaching each other and provide an upper gap between the opposing surfaces.
The lower core is in a transformer characterized in that it is divided into a plurality of parts in a direction orthogonal to the direction in which the pair of upper cores are arranged and in the vertical direction (Claim 2 ).

  In the transformer according to the first invention, the spacer is interposed in the upper gap, and the spacer connects the pair of upper cores. Thereby, even if an electromagnetic attractive force acts between the upper core and the lower core, vibration of the upper core can be suppressed.

  That is, by connecting the pair of upper cores with the spacer, the pair of upper cores are integrated. As a result, the resonance frequency of the upper core is lowered. This is based on the physical law that, when an object bends and vibrates, the resonance frequency decreases as the size (length) of the object in the bending deformation direction increases. That is, the resonance frequency can be lowered by increasing the length in the direction in which the pair of upper cores are arranged in the bending direction by integrating the pair of upper cores.

As a result, the resonance frequency of the upper core becomes a low value sufficiently away from the drive frequency of the transformer. Therefore, even when the electromagnetic attractive force is applied, the vibration of the pair of integrated upper cores having a low resonance frequency far from the fluctuation frequency is sufficiently reduced.
As a result, vibrations of the pair of upper cores can be suppressed, and thereby vibrations of the transformer can be suppressed.

  The spacer is made of a nonmagnetic material. Therefore, even if the spacer is interposed in the upper gap, the magnetic effect of the upper gap is not impaired, and the magnetic flux formed in the upper core and the lower core is not affected. That is, according to the above configuration, the vibration of the transformer can be effectively suppressed without affecting the magnetic flux formed.

  In the transformer according to the second aspect of the invention, the lower core is divided into a plurality of parts in a direction orthogonal to the arrangement direction and the vertical direction of the pair of upper cores. Thereby, even if an electromagnetic attractive force acts between the upper core and the lower core, vibration of the lower core can be suppressed.

  That is, by dividing the lower core as described above, the resonance frequency is lowered. This is based on the physical law that, when an object undergoes bending vibration, the resonance frequency decreases as the dimension (width) in the direction orthogonal to the vibration surface decreases. In other words, by dividing the lower core in the direction perpendicular to the vibration surface, ie, the direction in which the pair of upper cores are aligned and the direction perpendicular to the vertical direction, the width of the lower core is reduced to lower the resonance frequency of the lower core. can do.

As a result, the resonance frequency of the upper core becomes a low value sufficiently away from the drive frequency of the transformer. Therefore, even when the electromagnetic attraction force is applied, the vibration of the divided lower core having a low resonance frequency far from the frequency of the fluctuation is sufficiently reduced.
As a result, the vibration of the lower core can be suppressed, thereby suppressing the vibration of the transformer.

  As described above, according to the present invention, a transformer in which vibration is suppressed can be provided.

The (A) top view of a trans | transformer in the reference example 1 , (A) AA sectional view taken on the line AA of (A). The diagram which shows the change of the resonant frequency by providing the spacer in the reference example 1. FIG. (A) Top view of the trans | transformer in the reference example 2 , (B) BB arrow sectional drawing of (A). (A) Top view of a trans | transformer in the reference example 3 , (C) CC sectional view taken on the line of (A). (A) Top view of a trans | transformer in the reference example 4 , (D) The DD sectional view taken on the line of (A). FIG. 3 is a plan view of a transformer in the first embodiment . E view of FIG. The top view of the lower core in Example 1. FIG. The diagram which shows the sound pressure measured in the frequency range of 5-15kHz in Experimental example 1. FIG. The diagram which shows the sound pressure measured in the frequency range of 5-15kHz in Experimental example 2. FIG. The (A) top view of a trans | transformer in background art, The GG arrow directional cross-sectional view of (B) (A). Explanatory drawing of the vibration of a transformer in background art.

In the first invention or the second invention, the base plate is preferably made of a nonmagnetic metal such as aluminum. In this case, the transformer can be effectively radiated.
Moreover, the said primary coil and the said secondary coil may be one each, respectively, and 2 or more may be arrange | positioned.

1st invention WHEREIN: The said lower core is divided | segmented into plurality in the direction orthogonal to the alignment direction and said up-down direction of a pair of said upper core . Thereby , the resonant frequency of the said lower core can be made low and the vibration of a lower core can be suppressed. Therefore, the vibration suppression of the upper core and the vibration suppression of the lower core can be effectively performed, so that the vibration of the transformer can be further suppressed.

In the first invention or the second invention, the lower core has a non-contact surface that does not contact the base plate on a lower surface of the lower core that faces the base plate, and the non-contact surface is half the area of the lower surface. It is preferable to occupy the above area (Claim 3 ). In this case, it is possible to prevent the vibration of the transformer from propagating through the base plate. That is, even if the vibration of the transformer is suppressed by the arrangement of the spacer or the division of the lower core, it may be difficult to completely prevent the vibration. In such a case, by providing the non-contact surface on the lower core to reduce the contact area between the transformer and the base plate, it is possible to suppress the vibration of the transformer from propagating to the base plate. Propagation of vibration noise to the passenger compartment can be effectively suppressed.

Between the said lower core and the base plate, it is preferable that the vibration absorbing member is interposed (claim 4). In this case, the vibration absorbing member can absorb the vibration of the lower core and suppress the vibration of the lower core. Further, since the vibration absorbing member is interposed between the lower core and the base plate, the vibration of the transformer can be prevented from propagating to the base plate. As a result, for example, in a vehicle equipped with a transformer, it is possible to effectively suppress the vibration sound from propagating to the passenger compartment.
It is preferable that the formation area of the vibration absorbing member on the lower surface of the lower core occupies more than half of the area of the lower surface of the lower core. As the vibration absorbing member, for example, grease or the like can be used.

( Reference Example 1 )
A transformer according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the lower core 2 made of a magnetic material disposed on the base plate 6, and a pair of upper cores 3 made of a magnetic material disposed on the surface opposite to the base plate 6 side of the lower core 2, It consists of a primary coil 41 and a secondary coil 42 arranged between the lower core 2 and the upper core 3.
The transformer 1 is fixed to the base plate 6.

The upper core 3 is in contact with the lower core 2 on the outer side of the primary coil 41 and the secondary coil 42, and the vertical gap 11 is provided between the lower coil 2 and the inner side of the primary coil 41 and the secondary coil 42.
The pair of upper cores 3 extend from the outer side to the inner side of the primary coil 41 and the secondary coil 42 in a direction approaching each other, and are provided with an upper gap 12 between the opposing surfaces 31.
A spacer 5 made of a nonmagnetic material is interposed in the upper gap 12. The spacer 5 connects the pair of upper cores 3 to each other.

  The transformer 1 is incorporated in a DC-DC converter mounted on a vehicle. The DC-DC converter includes a transformer 1 housed in a casing together with other electronic components and electronic circuits. The casing is made of a nonmagnetic metal such as aluminum. The bottom plate portion of the housing constitutes the base plate 6.

In this specification, the normal direction of the mounting surface of the transformer 1 in the base plate 6 will be referred to as the vertical direction, the direction in which the mounting surface faces will be the upper side, and the opposite side will be the lower side.
The lower core 2 has a substantially rectangular shape when viewed from the normal direction of the base plate 6. Two upper cores 3 are opposed to the lower core 2 from above. The pair of upper cores 3 are in contact with each other along a pair of parallel sides of the lower core 2.

  As shown in FIG. 1 (B), the lower core 2 and the upper core 3 are not in contact with each other at the inner side of the contact portion 14 between the lower core 2 and the upper core 3. A primary coil 41 and a secondary coil 42 are disposed between the lower core 2 and the upper core 3 inside the contact portion 14. That is, the upper surface of the lower core 2 and the lower surface of the upper core 3 are formed with recesses 23 and 33 inside the contact portion 14, respectively. The recesses 23 and 33 are arranged to face each other, and the primary coil 41 and the secondary coil 42 are arranged in a space formed by both.

The primary coil 41 is formed by winding a conductor wire having an insulating film formed on the outer surface by a plurality of turns. The secondary coil 42 is made of a substantially annular metal plate. And the primary coil 41 is arrange | positioned in the state laminated | stacked on the upper and lower surfaces in the secondary coil 42, respectively, and the primary coils 41 arrange | positioned at the upper and lower surfaces of the secondary coil 42 are mutually connected in series. .
The primary coil 41 and the secondary coil 42 are stacked in a state where the winding axes of the primary coil 41 and the secondary coil 42 coincide with each other, and are held in a state of being wound around a bobbin (not shown) made of an insulator.

  As shown in FIG. 1, the transformer 1 is fixed to the base plate 6 by two holders 13. The holder 13 is disposed so as to hold down the transformer 1 from above to below the portion where the contact portion 14 between the lower core 2 and the upper core 3 is formed. The holder 13 is made of a member formed by bending a metal plate, for example, and includes a pressing portion 131 that presses the upper surface of the upper core 3 and a pair of flange portions 132 that are fixed to the base plate 6. The two holders 13 are arranged in parallel with each other, the respective pressing portions 131 are brought into contact with the upper surface of the upper core 3, and the pair of flange portions 132 are attached to the base plate 6 by screws 133. It is fixed. Thereby, the transformer 1 including the lower core 2, the pair of upper cores 3, the primary coil 41, and the secondary coil 42 is fixed to the base plate 6.

  The opposing surfaces 31 of the pair of upper cores 3 are arranged in parallel, and the upper gap 12 is formed between them. In addition, an upper and lower gap 11 is formed between the lower core 2 and the upper core 3 inside the primary coil 41 and the secondary coil 42. The spacer 5 is interposed in the upper gap 12. The spacer 5 is formed between substantially the entire region of the upper gap 12, that is, between substantially the entire regions of the opposed surfaces 31 of the pair of upper cores 3, and is joined to the substantially entire region of the opposed surfaces 31.

The spacer 5 does not necessarily have to be formed in substantially the entire area of the upper gap 12, and may be formed in a part of the upper gap 12 as long as the pair of upper cores 3 are connected. However, from the viewpoint of vibration suppression, the formation region of the spacer 5 is preferably wide, and is preferably formed in substantially the entire region of the upper gap 12.
The spacer 5 is made of ceramics such as alumina, and is bonded to the pair of upper cores 3 with an adhesive. The spacer 5 may be another non-magnetic material such as a resin.

Next, the function and effect of this example will be described.
The transformer 1 of this example is provided with a spacer 5 in an upper gap 12, and the spacer 5 connects a pair of upper cores 3. Thereby, even if an electromagnetic attractive force acts between the upper core 3 and the lower core 2, vibration of the upper core 3 can be suppressed.

  That is, the pair of upper cores 3 are integrated by connecting the pair of upper cores 3 with the spacers 5. If it does so, the resonant frequency of the upper core 3 will become low. This is based on the physical law that, when an object bends and vibrates, the resonance frequency decreases as the size (length) of the object in the bending deformation direction increases. That is, the resonance frequency can be lowered by increasing the length in the direction in which the pair of upper cores 3 are arranged in the bending direction by integrating the pair of upper cores 3.

  As a result, the resonance frequency of the upper core 3 becomes a low value sufficiently away from the drive frequency of the transformer 1. Therefore, even when the electromagnetic attraction force is applied, the vibration of the pair of integrated upper cores 3 having a low resonance frequency far from the fluctuation frequency is sufficiently reduced.

  That is, as shown in FIG. 2, when the pair of upper cores 3 are not integrated, the resonance frequency (frequency at which the vibration acceleration level reaches a peak) is relatively high, as indicated by the dashed curve L0. It is close to the drive frequency (fd) of the transformer 1. In this case, the vibration acceleration level at the drive frequency (fd) is relatively large, and the vibration of the upper core 3 tends to increase due to the fluctuation of the electromagnetic attraction force.

On the other hand, when the pair of upper cores 3 are integrated, as shown by the solid curve L1, the resonance frequency can be lowered and sufficiently reduced with respect to the drive frequency (fd) of the transformer. be able to. In this case, the vibration acceleration level at the drive frequency (fd) is reduced, and the vibration of the upper core 3 due to the fluctuation of the electromagnetic attraction force can be suppressed. The difference ΔL between the vibration acceleration levels (L0, L1) of the upper core 3 at the driving frequency shown in FIG.
Thus, according to this example, it is possible to suppress the vibration of the pair of upper cores 3, thereby suppressing the vibration of the transformer 1.

The spacer 5 is made of a nonmagnetic material. Therefore, even if the spacer 5 is interposed in the upper gap 12, the magnetic effect of the upper gap 12 is not impaired, and the magnetic flux formed in the upper core 3 and the lower core 2 is not affected. . That is, according to the above configuration, the vibration of the transformer 1 can be effectively suppressed without affecting the magnetic flux formed.
As described above, according to this example, it is possible to provide a transformer that suppresses vibration.

( Reference Example 2 )
In this example, as shown in FIG. 3, a non-contact surface 21 that does not contact the base plate 6 is provided on the lower surface of the lower core 2.
The non-contact surface 21 occupies more than half the area of the lower surface of the lower core 2.
That is, on the lower surface of the lower core 2, leg portions 22 are arranged at the four corners. As a result, the lower surface of the lower core 2 becomes a non-contact surface 21 that does not contact the base plate 6. And in the part which has not arrange | positioned the leg part 22, space will be formed between the non-contact surface 21 and the baseplate 6. FIG.

The leg portion 22 may be bonded to the lower surface of the lower core 2 or may not be bonded. Further, the leg portion 22 may be integrally formed by a part of the lower core 2.
Others are the same as in Reference Example 1 .

In the case of this example, the vibration of the transformer 1 can be prevented from propagating through the base plate 6. That is, even if the vibration of the transformer 1 is suppressed by the spacer 5, it may be difficult to completely prevent the vibration. In such a case, the non-contact surface 21 is provided on the lower core 2 to reduce the contact area between the transformer 1 and the base plate 6, thereby suppressing the vibration of the transformer 1 from propagating to the base plate 6. In such a vehicle, it is possible to effectively suppress the vibration sound from propagating to the passenger compartment.
In addition, the same effects as those of Reference Example 1 are obtained.

( Reference Example 3 )
In this example, as shown in FIG. 4, a vibration absorbing member 24 is interposed between the lower core 2 and the base plate 6.
That is, the vibration absorbing member 24 made of grease or the like is disposed between the non-contact surface 21 and the base plate 6 on the lower surface of the lower core 2 shown in Reference Example 2 . The vibration absorbing member 24 contacts both the base plate 6 and the lower surface (non-contact surface 21) of the lower core 2.
The formation area of the vibration absorbing member 24 on the lower surface of the lower core 2 occupies more than half of the area of the lower surface of the lower core 2.
Others are the same as in Reference Example 1 .

In the case of this example, the vibration absorbing member 24 can absorb the vibration of the lower core 2 and suppress the vibration of the lower core 2. Further, since the vibration absorbing member 24 is interposed between the lower core 2 and the base plate 6, it is possible to suppress the vibration of the transformer 1 from propagating to the base plate 6. As a result, for example, in a vehicle or the like on which the transformer 1 is mounted, it is possible to effectively suppress the vibration sound from propagating to the passenger compartment.
In addition, the same effects as those of Reference Example 1 are obtained.

( Reference Example 4 )
In this example, as shown in FIG. 5, the vibration absorbing member 24 is arranged in two places between the lower core 2 and the base plate 6.
Specifically, the vibration absorbing member 24 is disposed in a part below each of the pair of upper cores 3. The total formation area of the vibration absorbing members 24 on the lower surface of the lower core 2 is less than half the area of the lower surface of the lower core 2.
Others are the same as in Reference Example 3 .

In the case of this example, it is difficult to increase the vibration absorption effect as compared with Reference Example 3 , but the manufacturing cost of the transformer 1 can be reduced.
In addition, the same effects as those of Reference Example 1 are obtained.

( Example 1 )
As shown in FIGS. 6 to 8, a transformer 1 in which the lower core 2 is divided into two in the direction perpendicular to the alignment direction and the vertical direction of the pair of upper cores 3 (the Y direction in FIGS. 6 to 8). It is an example.
That is, in the transformer 1 of this example, the lower core 2 is divided into two divided cores 20 with the dividing line M shown in FIG. 8 as a boundary.
Others are the same as in Reference Example 1 .

  In the transformer 1 of this example, the lower core 2 is divided into a plurality (two) in the direction (Y direction) orthogonal to the direction in which the pair of upper cores 3 are arranged and in the vertical direction. Thereby, even if an electromagnetic attractive force acts between the upper core 3 and the lower core 2, vibration of the lower core 2 can be suppressed.

  That is, by dividing the lower core 2 as described above, the resonance frequency is lowered. This is based on the physical law that, when an object undergoes bending vibration, the resonance frequency decreases as the dimension (width) in the direction orthogonal to the vibration surface decreases. That is, the lower core 2 is divided into “a direction perpendicular to the arrangement direction of the pair of upper cores 3 and the vertical direction” (Y direction), which is a direction orthogonal to the vibration surface, and the width of the divided core 20 is reduced. As a result, the resonance frequency of the lower core 2 can be lowered.

As a result, the resonance frequency of the upper core becomes a low value sufficiently away from the drive frequency of the transformer. Therefore, even if the electromagnetic attractive force is applied, the vibration of the divided lower core having a low resonance frequency far from the frequency of the fluctuation is sufficiently reduced (see FIG. 2 and FIG. 2). (See also the description in Reference Example 1 above using the drawing).
As a result, the vibration of the lower core 2 can be suppressed, and thereby the vibration of the transformer 1 can be suppressed.
In addition, the same effects as those of Reference Example 1 are obtained.
In addition, in this example, although the example which divided | segmented the lower core 2 into 2 was shown, as long as it is the aspect divided | segmented into the said Y direction, you may divide | segment into 3 or more.

(Experimental example 1)
In this example, as shown in FIG. 9, the sound pressure level of the vibration sound generated by the transformer 1 according to the reference example 1 is compared with the sound pressure level of the vibration sound generated by the transformer not provided with the spacer 5. .
The “transformer without the spacer 5” used in the comparative example is the “transformer 9” shown in FIG. 11 described in the background art.

In the evaluation, the sound pressure level of the vibration sound of the transformer at each drive frequency was measured while gradually changing the drive frequency of the transformer between 5 and 15 kHz. That is, a microphone was placed at a position 10 cm above the upper core, vibration sound was collected, and the sound pressure level was measured.
The result is shown in FIG. In the figure, the curve P1 shows the measured value of the sound pressure level of the transformer of Reference Example 1 , and the curve P0 shows the measured value of the sound pressure level of the transformer of the comparative example.

As can be seen from the figure, the sound pressure level of the transformer of Reference Example 1 was lower than the sound pressure level of the transformer of the comparative example over the entire drive frequency range of 5 to 15 kHz. The sound pressure level of the transformer of Reference Example 1 is about 7 dB lower than the sound pressure level of the transformer of the comparative example in the vicinity of 10 kHz, which is the driving frequency of the transformer used in the DC-DC converter for an actual vehicle.

As described above, it was confirmed that the transformer according to Reference Example 1 can effectively suppress vibration and sufficiently suppress the vibration sound.

(Experimental example 2)
In this example, as shown in FIG. 10, the sound pressure level of the vibration sound generated by the transformer 1 according to the first embodiment is compared with the sound pressure level of the vibration sound generated by the transformer not provided with the spacer 5. .
The evaluation method is the same as in Experimental Example 1.
The evaluation results are shown in FIG. In the figure, the curve P5 indicates the measured value of the sound pressure level of the transformer of Reference Example 1 , and the curve P0 indicates the measured value of the sound pressure level of the transformer of the comparative example.

As can be seen from the figure, the sound pressure level of the transformer of Reference Example 1 was lower than the sound pressure level of the transformer of the comparative example over the entire drive frequency range of 5 to 15 kHz. The sound pressure level of the transformer of Reference Example 1 is about 5 dB lower than the sound pressure level of the transformer of the comparative example in the vicinity of 10 kHz, which is the driving frequency of the transformer used in the DC-DC converter for an actual vehicle.

As described above, it was confirmed that the transformer according to Example 1 can effectively suppress vibration and sufficiently suppress the vibration sound.

The above Reference Examples 1 to 4 and Example 1 can be appropriately combined, and in that case, it is possible to obtain the effects of both the combined examples.
For example, Reference Example 1 and Example 1 can be combined. That is, the spacer 5 can be arranged in the upper gap 12 as shown in FIG. 1, and the lower core 2 can be divided as shown in FIG. In this case, the resonance frequencies of both the upper core 3 and the lower core 2 can be lowered to suppress the vibrations of both the upper core 3 and the lower core 2. As a result, the vibration of the transformer 1 can be more effectively suppressed by the synergistic effect of both.

Further, for example, the configuration of any one of Reference Examples 2 to 4 can be combined with Example 1 . Also in this case, it is possible to suppress the vibration of the transformer 1 that cannot be suppressed from propagating to the base plate 6 while suppressing the vibration of the lower core 2.
In addition, the forms of Reference Examples 1 to 4 and Example 1 can be combined as appropriate.
In the present specification, the expressions “upper” and “lower” are expressions used for convenience, and the arrangement posture of the transformer with respect to the vertical direction is not particularly limited.

DESCRIPTION OF SYMBOLS 1 Transformer 11 Vertical gap 12 Upper gap 2 Lower core 3 Upper core 31 Opposite surface 41 Primary coil 42 Secondary coil 5 Spacer 6 Base plate

Claims (4)

A lower core made of a magnetic material disposed on the base plate, at least a pair of upper cores made of a magnetic material disposed opposite to the surface of the lower core opposite to the base plate, the lower core, and the upper core; A transformer composed of a primary coil and a secondary coil disposed between and fixed to the base plate,
The upper core is in contact with the lower core on the outer side of the primary coil and the secondary coil, and an upper and lower gap is provided between the lower coil and the inner side of the primary coil and the secondary coil,
The pair of upper cores extend from the outer side to the inner side of the primary coil and the secondary coil in a direction approaching each other and provide an upper gap between the opposing surfaces.
A spacer made of a nonmagnetic material is interposed in the upper gap,
The spacer connects the pair of upper cores ,
The said lower core is divided | segmented into plurality in the direction orthogonal to the arrangement direction and said up-down direction of said pair of upper core . A lower core made of a magnetic material disposed on the base plate, at least a pair of upper cores made of a magnetic material disposed opposite to the surface of the lower core opposite to the base plate, the lower core, and the upper core; A transformer composed of a primary coil and a secondary coil disposed between and fixed to the base plate,
The upper core is in contact with the lower core on the outer side of the primary coil and the secondary coil, and an upper and lower gap is provided between the lower coil and the inner side of the primary coil and the secondary coil,
The pair of upper cores extend from the outer side to the inner side of the primary coil and the secondary coil in a direction approaching each other and provide an upper gap between the opposing surfaces.
The said lower core is divided | segmented into plurality in the direction orthogonal to the arrangement direction and said up-down direction of said pair of upper core . 3. The lower core according to claim 1, wherein the lower core has a non-contact surface that does not contact the base plate on a lower surface of the lower core that faces the base plate, and the non-contact surface has an area of the lower surface. Transformer characterized by occupying more than half the area . The transformer according to any one of claims 1 to 3, wherein a vibration absorbing member is interposed between the lower core and the base plate .

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