JPH0661072A - Thin type transformer and power supply using the same - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a thin transformer that operates stably at high frequencies and has little loss, and further to provide a thin power supply and a thin personal device equipped with the thin transformer. . [Structure] A thin transformer is a coil body in which a plurality of insulated conductive wires each having a circular conductor cross section and an insulated outer periphery are wound in a spiral manner in a plurality of stages, and a part of the plurality of conductive wires is a primary coil. The winding and the rest are secondary windings, and a plurality of conducting wires of the secondary winding are wound in contact with the surface of the conducting wire of the primary winding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin transformer, a power supply device using the same, and OA equipment and A using the power supply device.
The present invention relates to a portable information processing device such as a V device.

[0002]

2. Description of the Related Art A conventional thin transformer is disclosed in, for example, Japanese Patent Laid-Open No.
As described in Japanese Patent No. 42907, a plurality of foils each having a wide width are insulated, laminated, wound, and cut out, and then a part of a circular thin plate-shaped coil is wound as a primary winding and the other is wound as a secondary winding. The transformer was constructed as the secondary winding.

[0003]

In the transformer obtained by the above-mentioned prior art, a plurality of coils are arranged on the same plane. Therefore, when the winding ratio of the primary and secondary of the transformer becomes 1: 3 or more, the primary winding is formed. Some secondary windings come out of direct contact with the wires. In this case, there is a problem that the magnetic coupling between the secondary winding and the primary winding becomes extremely poor, and the required characteristics as a transformer cannot be achieved. Also, when multiple outputs of 3 or more are taken, the number of conductors is 4 or more, and the same problem as described above occurs. Further, since a power supply device for personal equipment such as OA equipment and AV equipment is required to have multiple outputs with various output voltages, there is a problem in configuring the power supply device using a transformer of the related art.

Further, the primary of the above-mentioned conventional transformer,
Since the cross section of the secondary winding conductor is square, the capacitance between the primary and secondary windings becomes large, and when used at high frequencies, this capacitance is added to the magnetic coupling as a transformer. As a result, primary and secondary coupling occurs, and a resonance phenomenon occurs between the capacitance and the inductance of the circuit. Therefore, it is difficult to operate at high frequency, and there is a problem that high efficiency cannot be obtained when operating at high frequency.

An object of the present invention is to provide a thin transformer which has a large magnetic coupling and which operates stably at a high frequency with a small amount of primary and secondary coupling due to capacitance and no resonance or the like.
Another object of the present invention is to provide a thin transformer having a winding ratio of 1: 3 or more and capable of multiple outputs without deteriorating this characteristic.

Another object of the present invention is to reduce the thickness of the entire device by using the thin transformer as a power supply device and use the power supply device for a personal information processing device such as OA equipment or AV equipment. This is to make the device smaller and thinner.

[0007]

In order to achieve the above object, according to the present invention, a coil body is formed by spirally winding a plurality of insulated conductors each having a circular conductor cross section and an insulated outer periphery, A part of the plurality of conductors is a primary winding,
The thin transformer is characterized by a secondary winding for the rest.

In order to achieve another object, according to the present invention, there is provided a coil body in which a plurality of insulated conductor wires each having a circular conductor cross section and an insulated outer periphery are wound in a spiral manner in a plurality of stages. Part of the plurality of conducting wires is a primary winding and the rest is a secondary winding, and the plurality of conducting wires of the secondary winding are wound in contact with the surface of the conducting wire of the primary winding. Characteristic of thin transformer. Alternatively, as another means, a coiled body obtained by spirally winding a composite conductor obtained by winding a plurality of conductors in a concentric spiral shape on the outer periphery of the conductor wire serving as an axis through an insulating coating, A feature of the thin transformer is the configuration in which the core conductor wire is the primary winding and the other conductor wires are the secondary windings.

Further, in order to achieve another object, the present invention is characterized by a power supply device in which the thin transformer is used in a unit for voltage conversion, and the transformer is arranged on the same substrate as a power circuit component. Further, it is characterized in that the power supply device is used for a power supply portion of a portable information processing device such as a personal computer, a word processor and a disk device.

[0010]

According to the present invention, in the structure of the transformer, since a plurality of insulated conducting wires are arranged as a primary winding and a secondary winding in close contact with each other and arranged on a plane, it is possible to arrange them without a gap in the thickness direction and without an iron core. Thinning is possible because it can be composed of only conductors.
Since the primary and secondary winding conductors are placed in close contact with each other, a high-frequency current flows through each conductor when used at high frequencies, so the skin effect causes the closely spaced primary and secondary conductors to flow closer to each other. Magnetic coupling is improved. For this reason, most of the magnetic flux generated by the primary winding can be captured by the secondary winding even without the iron core of the magnetic body, so that the coupling between the primary and secondary is high and there is no iron loss, so that the efficiency is good. Also, the primary,
Since the secondary winding uses an insulated conductive wire having a circular cross section, even if both conductive wires are close to each other, they are in contact with each other only at a point, so that the capacitance between both conductive wires can be minimized and stable operation can be performed even at high frequencies.

Further, since the coil body formed by winding a plurality of stages or the composite conducting wire wound in a concentric spiral shape can contact the surface of the conducting wire of the primary winding and the conducting wire of the secondary winding can be wound a plurality of times. It is possible to obtain a large winding ratio or multiple outputs in the connected state of the secondary winding without deteriorating the characteristics.

Furthermore, since the thin transformer can be arranged on the same substrate as the power supply circuit component, the power supply device can be made thinner. In addition, this power supply device is a personal computer,
By using the power supply unit of a portable information processing device such as a word processor and a disk device, it is possible to reduce the thickness of the entire device.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, two insulated conductors C ₁₁ and C ₁₂ whose conductor cross section is circular and whose outer periphery is insulated are closely arranged in parallel.
The book is spirally wound together on the same plane to form a coil body, and terminals T are provided at both ends of the insulated conducting wires C ₁₁ and C ₁₂ , respectively.
₁₁ , T ₁₂ , T ₂₁ , and T ₂₂ are provided, and the insulated conductors C ₁₁ and C ₁₂ are provided.
A thin transformer is formed by using a primary winding and a secondary winding, respectively. FIG. 2 shows the two windings C ₁₁ and C ₁₂ of FIG.
Shows the magnetic flux distribution when viewed in cross section. As shown in the figure, the outer circumferences of the windings C ₁₁ and C ₁₂ are provided with insulating coatings I _S1 and I _S2 , and the two are adjacent to each other with the insulating coating interposed therebetween. Now, assuming that an AC current is passed through the primary winding C ₁₁ , first, when the frequency is low, the skin effect is small, so that the current is applied to the entire cross section of C ₁₁ (central portion C _1L , peripheral portion C _1H ). Flows. Therefore,
At low frequencies, as shown in the figure, the magnetic flux φ ₁ created by C _1L and C _1H of the primary winding C ₁₁ is the central portion C in the cross section of the secondary winding C _12.
2L and the peripheral part C _2H are wrapped. However, the magnetic flux φ ₂ ,
Since φ ₃ does not include all of C _2L and C _2H of the secondary winding,
As a whole, the secondary winding cannot capture (link) all the magnetic flux generated by the primary winding. However, when the frequency becomes high, the current does not flow in the central portion C _1L of the primary winding due to the skin effect, but concentrates in the peripheral portion C _1H of the conductor. Therefore, the magnetic flux created by the primary winding is easily captured by the secondary winding. Further, in the secondary winding as well as in the primary winding, current flows only in C _{2 H} on the surface of the conductor due to the skin effect. As a result, at high frequencies, the magnetic fluxes φ _{1 to} φ ₃ created by the conductor C _1H are all secondary windings C as shown in the figure.
Since it encloses _2H , the secondary winding can capture all the magnetic flux, and the primary and secondary coupling is improved, and as a result, the primary and secondary voltage conversion efficiency is improved. Further, by spirally winding as shown in FIG. 1, the magnetic flux passing through the inner circumference of the spiral is linked with all conductors, so that the coupling coefficient is further improved and the voltage conversion efficiency is improved.

FIG. 3 shows the primary and secondary coupling coefficients with respect to frequency in the thin transformer of this embodiment. As shown in the figure, it can be seen that the coupling coefficient sharply improves when the frequency is 10 kHz or higher, and approaches 100% when the frequency is 100 kHz or higher.

As described above, according to the embodiment of the present invention, it is possible to obtain a thin transformer having a simple structure, which is free from iron loss at high frequencies and has high efficiency.

FIG. 4 shows another embodiment of the present invention. This is because each of the above-mentioned insulated conducting wires C ₁₁ and C ₁₂ is independently wound in a spiral shape on a plane, and the wound coils are closely stacked in two layers, the upper coil being the primary winding and the lower coil being the secondary coil. Configure a transformer as a winding. The effect obtained by this configuration as the transformer is the same as that described with reference to FIGS. 2 and 3 above. In addition, by stacking the coils in a plurality of stages according to the application, the primary and secondary The effect that the winding ratio (voltage ratio) can be freely changed and multiple outputs can be realized is obtained.

FIG. 5 shows another embodiment of the present invention. This figure shows a thin transformer formed by spirally winding four insulated conductors C ₁₁ , C ₁₂ , C ₁₃ , and C ₁₄ whose conductor cross section is circular and whose outer circumference is insulated. Here transformer section A-A ', as shown in FIG. 6, conductor C _11, C _12, C
_13, C ₁₄ is the same wire diameter, also lead C _11, C ₁₂ and conductor C _13, C ₁₄ are arranged in two stages on the same plane, respectively, and conductor C _11, C ₁₂ and conductor C _13, C _{The position 14} is displaced by the radius of the conducting wire and is arranged in two rows above and below. Here, when the conductor C ₁₁ is used as a primary winding and the conductors C ₁₂ , C ₁₃ , and C ₁₄ are used as secondary windings to form a transformer, as shown in the figure, the primary winding C
_All of the secondary windings C ₁₂ , C ₁₃ and C ₁₄ are in direct contact with 11, and the electromagnetic relationship between the primary winding and the secondary winding is shown in FIG.
As in the case described with reference to FIG. 3, a configuration in which magnetic coupling is good is shown.

In FIG. 5, one of the four conductors is a primary winding and the remaining three are secondary windings, and if each secondary winding is connected in series, it becomes 1: 3. It can output the winding ratio. Moreover, if each output is taken from each secondary winding, it is 1: 1.
It is possible to take 3 outputs. In this way, many arrangements can be made according to the application. As another effect, since the conductors of each stage are arranged in a staggered manner, the thickness t of the transformer is represented by equation (1) when the conductor diameter is D and the number of conductor stages is m. There is an effect that it can be made smaller than the transformer thickness (dimension mD obtained by multiplying the conductor diameter D by the number of steps m).

T = D + (m−1) × (√3 / 2) × D (1) FIG. 7 shows another embodiment of the present invention. In the figure, six insulated conductors C ₁₁ , C ₁₂ , C ₁₃ , C ₁₄ , C ₁₅ , C ₁₆ are brought into contact with each other to form conductors C ₁₂ , C ₁₃ and conductors C ₁₁ , C ₁₄ and conductors C ₁₆ , C.
₁₅ are arranged in the same plane in three stages, and the conductors C ₁₂ , C ₁₃ and C ₁₁ , C ₁₄ and C ₁₆ , C ₁₅ in each stage are arranged so that their positions are substantially displaced by the radius of the conductor. . Here, assuming that the primary winding is C ₁₁ , the conductors C ₁₂ , C ₁₃ , C ₁₄ , C ₁₅ , C _{16 that} are secondary windings are arranged around this conductor. As a result, similar to FIG. 5, it is possible to obtain good effects such as good coupling between the primary and secondary and a reduction in the thickness of the transformer. In addition, if the primary and secondary windings have the same diameter, up to 1: 5 Can have up to 5 outputs with a turns ratio of, or 1: 1.

FIG. 8 shows another embodiment of the present invention. This is also an example in which the number of stages is three as in the case of FIG. 7, six insulated conductors are used, the primary winding is C ₁₁ , C ₁₅ , and the secondary winding is C ₁₂ ,
In this example, C ₁₃ , C ₁₄ , and C ₁₆ are selected, and the conductors in each stage are arranged so as to be displaced by half the conductor diameter. When arranged in this way, all primary and secondary windings are in direct contact with each other, so that the coupling is good. When two primary windings are connected in parallel and the other four conductors are connected in series as secondary windings, a turns ratio of 1: 4 is obtained. If the primary windings are connected in parallel with C ₁₃ , C ₁₄ and C ₁₅ and the other 3 conductors are connected in series, a turns ratio of 1: 3 is obtained, and all the primary and secondary windings are directly connected to each other. Since they are in contact with each other, the connection is good. In this way, by selecting the primary and secondary windings so that they are in direct contact with each other, the coupling is improved, but if the connection of the primary and secondary windings is changed to series or parallel, the turn ratio becomes 1: 1 to 1: 1.
You can choose 1: 5.

FIG. 9 shows another embodiment of the present invention. The bobbin G _C is placed in the air-core part of the transformer configured as shown in FIGS. 5, 7 and 8, and the outer shape of the bobbin has a step of exactly half the diameter of the conductor wire, and the bobbin upper and lower surfaces have guide plates. G _S1 ,
It is characterized by providing G _S2 and further providing terminals T ₁ , T ₂ , T ₃ , T ₄ for drawing out a conductor wire on the surface of the bobbin or the guide plate. As a result, by winding the conductive wire along the outer circumference of the bobbin, the transformers shown in FIGS. 5, 7, and 8 can be easily manufactured, and the guide plates G _S1 , G
The effect of _{S2 is} that the conductor can be protected electrically and mechanically. In FIG. 9, the guide plates G _S1 and G _S2
However, if it is not needed after manufacturing, it is okay to remove this and form a transformer.

FIG. 10 shows another embodiment of the present invention. This example is an example in which insulated conductors having different diameters are combined. They are arranged one conductor C ₁₁ large and conductor C ₁₂ -C ₁₅ having a small diameter four as shown diameter. The conductor having a small diameter is an example selected to be half the diameter of a conductor having a large diameter, and shows a part of a cross section in which the conductor is spirally wound twice. When the primary winding is C ₁₁ and the other conductive wire is the secondary winding, the primary and secondary windings are in direct contact with each other, so that the coupling between the primary and secondary can be improved. Furthermore, the space factor of the conductor is increased and the transformer can be made smaller and thinner than in the above-described embodiments in which the primary and secondary conductor wires having the same diameter are used.

In the figure, if the primary winding is C ₁₁ and the secondary windings C ₁₂ , C ₁₃ , C ₁₄ and C ₁₅ are connected in series, a turn ratio of 1: 4 can be obtained. In addition, the secondary winding C
_{When 12} , C ₁₃ and C ₁₄ , C ₁₅ are respectively connected in parallel, they are connected in series to obtain a turns ratio of 1: 2.

FIG. 11 shows another embodiment of the present invention. In this example, one conductor C ₁₁ having a small diameter is spirally wound so as to be surrounded by four conductors C ₁₂ , C ₁₃ , C ₁₄ and C ₁₅ having a large diameter. At this time, the conductor having a small diameter is selected to be (√2-1) times the diameter of the conductor having a large diameter. Here, assuming that the primary windings are C ₁₂ , C ₁₄ and the secondary windings are C ₁₁ , C ₁₃ , C ₁₅ , since the primary and secondary windings are in direct contact, the primary and secondary windings are You can improve the binding of.

In the figure, the primary windings C ₁₂ , C ₁₄
Are connected in parallel, the secondary windings C ₁₃ and C ₁₅ are connected in series, and C ₁₁
When used alone, two sets of outputs are obtained, 1: 2 and 1: 1. It is also possible to use C ₁₁ as the primary winding and the other as the secondary winding.

FIG. 12 shows another embodiment of the present invention in which four conductors are wound in a rectangular shape. FIG. 5 shows a winding in a circular shape, but this example is wound around a rectangular winding frame at the same time. By doing so, it can be configured into a rectangular shape in a plane. As shown, the four conductors C ₁₁ , C
_{In this example, 12} , C ₁₃ and C ₁₄ are brought into contact with each other and wound in the outer peripheral direction to form a coil body. Conductors C ₁₁ , C ₁₂ , C ₁₃ ,
C ₁₄ has the same wire diameter, and its cross section is such that conductors C ₁₁ , C ₁₂ and conductors C ₁₃ , C ₁₄ are arranged in two steps on the same plane, respectively, and the conductor C ₁₁ , C ₁₂ and the conductors C ₁₃ and C ₁₄ are arranged so as to be displaced from each other by a position corresponding to the radius of the conductor. With such a shape, in addition to the effect of the embodiment of FIG. 5, there is no wasted space when incorporated in the device,
It has the effect of being easy to place. That is, when it is used as a power supply, it can be easily arranged with other components, and a wasteful space can be eliminated even when a plurality of transformers are arranged, and the space factor can be improved.

FIG. 13 shows a structural example of the transformer according to the present invention. The configuration of the transformer shown in the figure is largely different from that of the transformers described above. One of the primary windings is a large current conducting wire 11 with an insulating coating and the other is n secondary windings. Insulation coated small current conductor 21,
The concentric spirally wound composite electric wire 2 composed of 22, 23, and 24 is formed by spirally winding in a plane. A configuration example of the concentric spirally wound composite electric wire 2 will be described with reference to FIG. 4 small current conducting wires 2 around the large current conducting wire 11 as an axis
1, 22, 23, and 24 are wound in a concentric spiral shape.
According to this configuration, all four small current conducting wires have substantially the same geometrical positional relationship with the large current conducting wires, and therefore the difference in the coupling coefficient and the leakage inductance between the four small current conducting wires is small.

In this transformer, the terminals 21b and 22a, 22b and 23a of the secondary winding are connected by external connection, for example.
By connecting 23b and 24a, the terminal 21 of the secondary winding
The total length of the wire between a and 24b is the terminal of the secondary winding 1
This is almost four times the total length of the electric wire between 1a and 11b. 14
When a high-frequency current is passed through the composite electric wire 2 shown in Fig. 3, the skin effect improves the coupling between the primary and secondary windings and reduces the leakage flux. Therefore, the interlinkage magnetic flux amount of the primary and secondary windings is approximately 1: Four
Therefore, the voltage ratio of the transformer 1 is also 1: 4. It is also possible to use all or part of the secondary windings 21 to 24 as a single secondary winding, and to use as a multi-winding transformer having a plurality of secondary windings for one primary winding. You can also do it.

FIG. 15 shows a modification of FIG. 13 of the present invention.
The figure shows a cross-sectional view of an example of the concentric spirally wound composite electric wire 2,
As an example, three 12a, 12b, 12c are combined into a large current conducting wire 12, and as an example, 10 small current conducting wires 27a, 27b, ..., 27j are spirally wound around the periphery of the large current conducting wire 12. is there. Here, an insulation-coated electric wire may be used for the three strands 12a, 12b, 12c of the large-current conductor, or a bare electric wire may be used to provide an insulating layer between the three small-current conductors. Good. In addition, three strands 12
The presence or absence of dislocations between a, 12b and 12c does not matter. According to the present embodiment, the wire diameter can be reduced while ensuring the required cross-sectional area of the large-current conducting wire, so that the composite electric wire 2 having a small rigidity and a large flexibility can be constructed, and the composite electric wire 2 can be spirally wound to form a transformer. It has good workability and can manufacture a transformer with a small inner diameter. Further, when the insulation coated electric wires are used for the wires 12a, 12b, 12c, it is possible to prevent the eddy current flowing between the wires, so that there is an effect of loss reduction and efficiency improvement.

FIG. 16 shows a modification of FIG. 13 of the present invention.
The figure shows a sectional view of an example of the concentric spirally wound composite electric wire 2. This is the large current conductor 13 and the small current conductors 28a, 28b, 2
This is an example in which 8c and 28d are composed of a thin wire assembly electric wire. According to the present embodiment, the composite electric wire 2 having a small rigidity can be formed even if each conductor has the same cross-sectional area as compared with the case of forming a single wire, and a spiral transformer having a small inner diameter can be manufactured with good workability.
Further, by using an electric wire with an insulation coating for each element wire, it is possible to prevent an effective increase in resistance due to a skin effect when a high-frequency current is passed and an increase in loss due to an eddy current, and there is an effect that efficiency can be improved. Although FIG. 16 shows an example in which the wire diameters of the large current conducting wire 13 and the small current conducting wires 28a, 28b, 28c, 28d are the same, the wire diameters of the two may be different.

FIG. 17 shows an example in which a plurality of coil bodies having the same shape as the rectangular coil body C ₁ shown in FIG. 12 of the present invention are arranged according to the specifications. In this example, four coil bodies C ₁ to
It was placed without clearance a C ₄ two-by-two aspect. Such dispersive arrangement makes it possible to form a coil body having a size that is easy to make and to dispose the coil body, which is suitable for mass production.
Although a rectangular example is shown here, the same effect can be obtained by arranging a plurality of circular coil bodies as shown in FIG.

FIG. 18 shows an example of the optimum arrangement and connection when the _four coil bodies C _{1 to} C ₄ as shown in FIG. 17 are arranged. Here, for the sake of clarity, the primary windings C _{11 to} C
Only ₄₁ is shown, showing its placement and connections. Although the secondary winding is omitted, it has the same connection as the primary winding. The figure shows an example in which four coil bodies having the same shape are arranged. As shown in the drawing, the outer terminal T ₁₁₁ of the coil body of the first conductor C ₁₁ is connected to the whole terminal T 11.
Connect to _01, inside the terminal T ₂₁₂ of the inner terminal T ₁₁₂ coil body of the second conductor C _21, an outer terminal T ₂₁₁ of the coil body of the second conductor C ₂₁ of the third conductor C ₃₁ coils Connect to outer body terminal T ₃₁₁ . The terminal T ₃₁₂ inside the coil body of the third conductor C ₃₁ is connected to the inside terminal T of the coil body of the fourth conductor C _41.
412 , the outer terminal T of the coil body of the fourth conductor C _41
411 is connected to the overall terminal T ₀₂ . In this way, the next outer terminal is connected to the outer terminal of the previous coil body, and the next inner terminal is sequentially connected to the inner terminal. When the connection is made in this way, the direction of the current becomes the same as shown by the arrows of the conductor C ₁₁ and the conductors C ₂₁ and C _{41 which} are adjacent to each other as shown in the drawing, and the primary winding of the conductor C _{11 and} the secondary of the conductor C ₂₁ Coupling is also provided between the windings and between the secondary winding of the conductor C _{11 and} the primary winding of the conductor C ₂₁ , so that the coupling between the primary winding and the secondary winding between both coil bodies is further improved. . Similarly, there is an effect that the coupling between all the coil bodies is improved.

FIG. 19 shows an embodiment in which a plurality of coil bodies are connected in parallel. The primary winding is shown in a simplified manner in an example in which four coil bodies having the same shape are arranged. Wiring is the first and third conductors C
The winding end terminals T ₁₁₁ and T ₃₁₁ of the odd coil bodies ₁₁ and C ₃₁ and the winding start terminals T ₂₁₂ and T ₄₁₂ of the even coil bodies of the second and fourth conductors C ₂₁ and C ₄₁ are connected to the overall terminal T ₀₁ . The remaining terminals, that is, the winding start terminals T ₁₁₂ and T ₃₁₂ of the odd-numbered coil body of the first and third conductors C ₁₁ and C ₃₁ , and the second and fourth conductors C ₂₁ and
The winding end terminals T ₂₁₁ and T ₄₁₁ of the even coil body of C ₄₁ are connected to the overall terminal T ₀₂ . When the coil bodies are connected in parallel in this way, the adjacent conductor C ₁₁ and conductors C ₂₁ and C ₄₁ as shown in the drawing are shown.
As indicated by the arrow, the direction of the current becomes the same, and similarly, the coupling between the primary and the secondary among all the coil bodies is improved.

FIG. 20 shows an example of series connection of coil bodies arranged in a triangle. In the example in which four identical triangular coil bodies are arranged, the primary winding is shown in a simplified manner. Connection is first
The winding end (outer) terminal T ₁₁₁ of the coil body of the conductor C ₁₁ is connected to the overall terminal T ₀₁ , and the winding start (inner) terminal T ₁₁₂ is connected to the winding start terminal T ₂₁₂ of the coil body of the second conductor C _21. connection,
The winding end terminal T ₂₁₁ of the coil body of the second conductor C ₂₁ is set to the third end.
The conductor C ₃₁ is connected to the winding end terminal T ₃₁₁ of the coil body. The winding start terminal T ₃₁₂ of the coil body of the third conductor C ₃₁ is connected to the winding start terminal T ₄₁₂ of the coil body of the fourth conductor C ₄₁ ,
The winding end terminal T ₄₁₁ of the coil body of the fourth conductor C ₄₁ is connected to the overall terminal T ₀₂ . When the connections are made in this way, the directions of the currents become the same as shown by the arrows of the adjacent conductor C ₁₁ and conductors C ₂₁ and C ₄₁ as shown in the figure, and similarly, the primary and secondary couplings between all blocks are made. Will get better.

FIG. 21 shows another embodiment of the present invention. This is a coil body 3 in which a concentric spirally wound composite electric wire 2 is spirally wound.
And a coil body 3'having a concentric spirally wound composite electric wire 2'wound in the opposite direction are superposed to form a transformer 1 '.
In this embodiment, by connecting the terminals 11b and 11b ', the outer peripheral terminals 11a and 11 of both spiral coil bodies 3 and 3'are connected.
A high current coil is formed between a '. For small current coils with many turns, for example, terminals 21b and 21b ', 21
a'and 22a, 22b and 22b ', 22a' and 23a,
23b and 23b ', 23a' and 24a, 24b and 24
By connecting b ', a coil having a length approximately four times that of the large current coil is formed between the outer peripheral terminals 21a and 24a'.
According to the present embodiment, it is possible to form a predetermined terminal on the outer peripheral end of the spiral coil body without providing a connecting wire extending to the outer peripheral end, and to connect the wiring of the circuit board mounting the transformer and the peripheral circuit. This has the effect of simplifying the wiring layout.
In this embodiment, the coil bodies 3 and 3'need not be separate bodies, and if one concentric spirally wound composite electric wire 2 is continuously wound, connection at the inner peripheral end becomes unnecessary, and the manufacturing The process is simplified and reliability is improved.

In the present invention, the winding of the electric wire operates as a high frequency transformer by itself, as described above. However, since there is no magnetic path, the magnetic flux flowing in the surrounding space may increase. Therefore, as shown in FIG. 22, an effective structure is to surround the coil body 3 of the concentric spirally wound composite electric wire 2 with the magnetic shield body 30 to reduce the magnetic flux flowing in the space. According to this configuration example, in addition to the magnetic shield effect, there is an effect that the primary-secondary magnetic coupling can be improved even in a relatively low frequency range. The magnetic shield body 30 of the embodiment shown in FIG. 22 can be formed by applying a resin mixed with magnetic particles such as ferrite powder or magnetic metal powder, or by winding a tape material coated with magnetic particles. Further, it may be composed of an amorphous or microcrystalline foil-like magnetic material or a silicon steel strip. The magnetic shield body 30 does not have to be a closed magnetic circuit that surrounds the entire coil body 3, and an open magnetic circuit structure that covers a part thereof is also effective.

Further, in FIG. 22, a heat radiating plate HF made of a copper plate or the like is further provided around the coil body 3 and surrounded by the magnetic shield body 30, so that the heat generated in the coil body 3 can be efficiently transmitted to the outside. Can be released well.

FIG. 23 shows an example of the structure when the thin transformer of the present invention is used in a power supply device. This power supply is DC /
It is a DC converter, and FIG. 24 shows its specific circuit. First, the connection relationship between the thin transformer of the present invention and other parts constituting the apparatus will be described with reference to this drawing. A DC voltage V _i is applied to the input, and a smoothing capacitor P ₁ is connected in parallel with this.
Connect. The primary winding C ₁₁ of the thin transformer C ₁ and the switching element PT are connected in series to these. A diode D ₁ is connected in series to the secondary winding C ₁₂ of the thin transformer, a diode D ₂ is connected to both ends of the secondary winding C ₁₂ , and a choke coil C _h and a capacitor P ₂ are connected in parallel to the diode D ₂ . The output V ₀ is obtained from both ends of the capacitor P ₂ .
Further, the output voltage V ₀ for stabilizing the output voltage V ₀ is input to the control circuit SC, the control circuit SC is connected a resistor R ₁ and R ₂ between the output V _0, the amplifier OP from the connection point input. Further, the reference voltage V _S is applied to the other input terminal of the amplifier OP.
Connect. The output of the amplifier OP is a photo coupler P.
Connect to C input. The output of the photocoupler PC is connected to the pulse width modulator oscillator (PWM OSC) PW,
The output is connected to the base of the switching element PT.

FIG. 23 shows a thin transformer C ₁ , a choke coil C _h , a power element PT, diodes D ₁ and D ₂ , capacitors P ₁ and P ₂ , a control circuit C _C and an external connection which constitute the DC / DC converter. The terminals T _m of the above are arranged on the same wiring board B _d . Here, only the primary winding of the thin transformer is used as the choke coil C _h .

As described above, according to the present invention, since the thin transformer can be mounted on the same substrate as the semiconductor element constituting the power supply device, there is an effect that the power supply device can be made thin.

FIG. 25 shows a configuration example in which the personal computer is equipped with the power supply device shown in FIG. DI is a display, and the power supply device PS can be installed under the keyboard KB in the case CA by making it thin. The power supply unit (adapter) for a conventional personal computer is Case C.
Although it was located outside A and the power supply wiring was complicated, this invention also solved this point. The application of the power supply device of the present invention is not limited to the personal computer shown in the same figure, and the effect of the present invention can be obtained more by using it for an information processing device of a personal small OA device such as a word processor.

26 and 27 show the respective embodiments in which the power supply device of the present invention is arranged in a personal OA device, and the drawings show sectional views of the device. FIG. 26 shows a keyboard KB and a case CA.
Between the OA equipment component BH and the power supply drive circuit PC
And the thin transformer C ₁ is embedded in the bottom part of the case. In this way, the device can be made smaller and thinner.

In FIG. 27, the component BH of the OA equipment and the drive circuit PC of the power supply device are arranged between the keyboard KB and the case CA, and the thin transformers C ₁ and C ₂ are embedded separately on both sides of the case. By doing this, the personal device is small,
Thin type is possible.

FIG. 28 shows the thin transformer shown in FIGS. 26 and 27 and its wiring. Even when the thin transformer is separated from the power supply unit, the lead wires C _11H and C of the primary and secondary windings
Place _12H closer together. By doing this, the primary wiring part C _11H
And the secondary wiring part C _12H are well coupled, and this part also works as a voltage conversion part, so that it can be effectively used. Even if the conductor of the wiring portion is different from that of the thin transformer, the same effect can be obtained if the conductors are arranged close to each other.

FIG. 29 shows an example of the structure in which the power supply device of the present invention is used in a compact optical disk device such as AV equipment. The disk DES is rotationally driven by a motor M ₁ attached to the case CA, information is input / output to / from the disk DES by an optical head PH, and a head feed motor M ₂ moves the optical head. Here, the power supply device P of the present invention is used as a power supply for the motor M ₁ , the head feed motor M _2, etc.
S is used, but its arrangement is space-wise and the head mechanism P is used.
It is on the case opposite to H and M ₂ . This has the effect of making the device thinner.

[0046]

According to the present invention, since a plurality of insulated conducting wires are arranged as a primary winding and a secondary winding in close proximity to each other and arranged on a plane, a transformer can be arranged without a gap in the thickness direction and an iron core. Since it can be made up of conductors only, it can be made thinner. Since the primary and secondary winding conductors are placed in close contact with each other, a high-frequency current flows through each conductor when used at high frequencies, so the skin effect causes the closely spaced primary and secondary conductors to flow closer to each other. Magnetic coupling is improved.
For this reason, most of the magnetic flux generated by the primary winding can be captured by the secondary winding even without the iron core of the magnetic body, so that the coupling between the primary and secondary is high and there is no iron loss, so that the efficiency is good. Also,
Since the primary and secondary windings use insulated conductors having a circular cross section, the capacitance between the conductors can be minimized by contacting them only at points even if the conductors are close to each other, and stable operation can be achieved even at high frequencies.

Further, since a coil body formed by winding a plurality of stages or a concentric spirally wound composite conductor can come into contact with the surface of the conductor wire of the primary winding and the conductor wire of the secondary winding can be wound a plurality of times, It is possible to obtain a large winding ratio or multiple outputs in the connected state of the secondary winding without deteriorating the characteristics.

Furthermore, since the thin transformer can be arranged on the same substrate as the power supply circuit component, the power supply device can be made thinner. In addition, this power supply device is a personal computer,
By using the power supply unit of a portable information processing device such as a word processor and a disk device, it is possible to reduce the thickness of the entire device.

[Brief description of drawings]

FIG. 1 is a winding configuration diagram of an embodiment of the present invention.

FIG. 2 is an explanatory view showing the coupling between the conductors of FIG.

FIG. 3 is a characteristic diagram of FIG.

FIG. 4 is a winding configuration diagram of another embodiment of the present invention.

FIG. 5 is a winding configuration diagram of another embodiment of the present invention.

6 is a cross-sectional view taken along the line AA ′ of the winding of FIG.

FIG. 7 is a cross-sectional view of a winding configuration of another embodiment of the present invention.

FIG. 8 is a cross-sectional view of a winding configuration of another embodiment of the present invention.

FIG. 9 is a cross-sectional view of a winding structure according to another embodiment of the present invention.

FIG. 10 is a cross-sectional view of a winding structure according to another embodiment of the present invention.

FIG. 11 is a cross-sectional view of a winding structure according to another embodiment of the present invention.

FIG. 12 is a winding configuration diagram of another embodiment of the present invention.

FIG. 13 is a winding configuration diagram of another embodiment of the present invention.

FIG. 14 is a detailed view of the winding in FIG.

FIG. 15 is a cross-sectional view of windings in a modification example of FIG. 13 of the present invention.

16 is a cross-sectional view of a winding according to the modified example of FIG. 13 of the present invention.

FIG. 17 is a layout diagram when a plurality of windings of the present invention are used.

FIG. 18 is a layout diagram when a plurality of windings of the present invention are used.

FIG. 19 is a layout diagram when a plurality of windings of the present invention are used.

FIG. 20 is a layout diagram when a plurality of windings according to the present invention are used.

FIG. 21 is a layout diagram when a plurality of windings of the present invention are used.

FIG. 22 is a cross-sectional perspective view of a transformer in which a magnetic shield is provided around the winding wire of the present invention.

FIG. 23 is an example of the configuration when the thin transformer of the present invention is used in a power supply device.

FIG. 24 is a circuit diagram of a power supply device using the thin transformer of the present invention.

25 is a configuration diagram of a personal computer including the power supply device of FIG.

FIG. 26 is a sectional view of a device when the power supply device of the present invention is arranged in a personal device.

FIG. 27 is a cross-sectional view of a device when the power supply device of the present invention is arranged in a personal device.

FIG. 28 is a configuration diagram of a thin transformer and a lead wire of the present invention.

29 is a configuration diagram of a disk device including the power supply device of FIG. 23.

[Explanation of symbols]

C ₁ ... Thin transformer, C ₁₁ ... Primary winding, C ₁₂ , C ₁₃ , C
₁₄ ... secondary _{windings, T 11, T 21, T} 31, T 41 ... terminal.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideaki Horie 4026 Kuji Town, Hitachi City, Ibaraki Prefecture Hitate Manufacturing Co., Ltd., Hitachi Research Laboratory (72) Inventor Shuya Hagiwara 4026 Kuji Town, Hitachi City, Ibaraki Prefecture Nitate Works Co., Ltd. Hitachi Research Laboratory (72) Inventor Noriyuki Uchiyama 4026 Kuji Town, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Hitachi Research Institute (72) Inventor Tatsu Saito 4026 Kuji Town, Hitachi City, Ibaraki Hitachi Research Laboratory, Ltd.

Claims (22)

[Claims] 1. A coil body formed by spirally winding a plurality of insulated conductor wires each having a circular conductor cross section and insulated from the outer periphery, wherein a part of the plurality of conductor wires is a primary winding. A thin transformer characterized by a secondary winding for the rest. 2. A plurality of stacked coil bodies, each of which is formed by spirally winding an insulated conductor having a circular conductor cross section and an insulated outer periphery, and a part of the plurality of coil bodies is a primary winding. And a thin transformer characterized by a secondary winding for the rest. 3. A coil body in which a plurality of insulated conductors each having a circular conductor cross section and an insulated outer periphery are wound in a spiral manner in a plurality of stages, and a part of the plurality of conductors is a primary winding. ，
A thin transformer characterized in that the rest is a secondary winding, and a plurality of conducting wires of the secondary winding are wound in contact with the surface of the conducting wire of the primary winding. 4. The thin transformer according to claim 3, wherein the conductors of the odd-numbered stages and the conductors of the even-numbered stages are wound such that the centers of the respective conductors are displaced. 5. A thin transformer according to claim 4, wherein the bobbin having a step on the outer circumference is wound with the plurality of conductive wires. 6. A thin transformer according to claim 5, wherein winding guide plates are provided on the upper and lower surfaces of the bobbin, and at least one of the guide plate and the bobbin is provided with the terminal for drawing out the conducting wire. 7. The thin transformer according to claim 3, wherein among the plurality of insulated conductors, the conductors have different diameters by at least two types. 8. The thin transformer according to claim 7, wherein, of the plurality of insulated conductive wires, a conductive wire serving as a secondary winding has a diameter smaller than that of a conductive wire serving as a primary winding. 9. An insulating coating is provided on the outer circumference of the conductor wire as an axis,
A coil body formed by spirally winding a composite conductor in which a plurality of conductors are wound in a concentric spiral shape, wherein the axis conductor is the primary winding and the other conductors are the secondary windings. A thin transformer. 10. A thin transformer according to claim 9, wherein the conductor wire serving as the shaft is subdivided by combining a plurality of electric wires. 11. The spiral coil body according to claim 9, and the coil body having a spiral direction opposite to each other are overlapped with each other, and each constituent wire of the composite electric wire is connected at an inner peripheral end of each coil body. A thin transformer. 12. A thin transformer according to any one of claims 1 to 11, wherein a coil body formed by spirally winding the conductor wire has a rectangular outer shape. 13. The thin transformer according to claim 1, wherein a coil body formed by winding the conducting wire in a spiral shape is surrounded by a magnetic material. 14. The thin transformer according to claim 1, wherein a heat radiating plate is provided on a coil body formed by winding the conductive wire in a spiral shape. 15. The thin transformer according to any one of claims 1 to 11, wherein a plurality of coil bodies each having the conductor wire wound in a spiral shape are provided, and the coil bodies are connected in series, in parallel, or in series-parallel. A thin transformer characterized by being connected and configured. 16. A thin transformer according to claim 15, wherein the coil bodies are connected such that the primary windings of the coil bodies adjacent to each other have the same current direction. 17. A power supply device, characterized in that the thin transformer according to any one of claims 1 to 16 is used in a unit for voltage conversion. 18. A power supply device characterized in that the thin transformer according to any one of claims 1 to 16 and the power supply circuit component are arranged on the same substrate. 19. A portable information processing device, such as a personal computer, a word processor, and a disk device, which uses the power supply device according to claim 18. 20. A personal computer using the thin transformer according to any one of claims 1 to 16,
Portable information processing devices such as word processors and disk devices. 21. The information processing apparatus according to claim 20, wherein the thin transformer is embedded in a case of the apparatus. 22. The information processor according to claim 21, wherein the lead wires of the thin transformer are arranged in close proximity as a pair of primary and secondary windings of the transformer, which are connected to the same polarity. .