JPH0613108U - Transformer - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a transformer which is easy to manufacture, can prevent an accident such as short circuit or disconnection of a circuit, and has stable quality. [Structure] A coil set (1) comprising a combination of coil substrates (3a, 3b, 3c) formed by printing circuits forming coils on the surface of a substrate is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transformer having a circuit formed by printing.

[0002]

[Prior art and its problems]

 Conventionally used transformers are generally constructed by winding enamel wire. However, such a transformer not only takes time to manufacture, but also has a problem that defective products frequently occur due to damage to the conductor coating. For this reason, there is a strong demand for a transformer that can be easily manufactured and has stable quality.

[0003]

[Means for Solving the Problems]

 The transformer of the present invention comprises a coil set formed by stacking a plurality of coil substrates on each of which a circuit forming a coil is formed by printing on the surface of a base.

In the transformer having the above-mentioned structure, since the circuit that constitutes the coil is formed by printing, the manufacturing is extremely simple, and an accident such as a short circuit or disconnection of the circuit is hard to occur. Very promising for use in products.

[0005]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a perspective view showing the outline of the transformer of the embodiment. The transformer shown in this figure is constructed by stacking a plurality of coil sets 1 (four in this embodiment) on top of each other, and inserting an iron core 2 through a hole 1a formed in the center of the coil set 1. There is.

As shown schematically in FIG. 2, the coil set 1 has three types: a coil substrate 3a in the uppermost layer, a coil substrate 3b in the middle (B in the same figure), and a coil substrate 3c in the lowermost stage (C in the same figure). It consists of As shown in detail in FIG. 3, the coil substrate 3a, which is the uppermost layer, is formed by printing (or photoetching) the circuits 5 constituting the coil on the front and back surfaces of the substrate 4. In FIG. 3, the left side shows the front surface of the coil substrate 3a, and the right side shows the back surface. An input terminal 6 is connected to the outer peripheral end of the circuit 5 on the surface of the coil substrate 3a.

On the other hand, a wide contact portion 8 is formed at the outer peripheral end of the circuit 5 on the back surface side of the coil substrate 3a. In addition, holes 9 are inserted through both ends of the circuit on the front and back sides on the inner peripheral side, and solder is injected into the holes to connect to each other. The winding direction of the circuit 5 on the back side is the same as that of the circuit 5 on the front side. That is, the circuit 5 on the front surface is wound clockwise from the terminal 6 toward the inside, and the circuit 5 on the back surface is also wound clockwise from the contact portion 8 toward the inside.

In the coil board 3a having the above-described structure, the current supplied from the terminal 6 on the front surface flows inward in the clockwise direction, and flows from the connection portion of the hole 9 to the circuit 5 on the rear surface side. Then, the current also flows in the clockwise direction from the hole 9 toward the contact portion 8 side when the circuit 5 on the back surface side is viewed from the front surface side.

In FIG. 3, the interruption and the lower stage show the intermediate coil substrate 3b and the lowermost coil substrate 3c, respectively. The coil substrate 3b has the same winding direction of the circuit 5 as the coil substrate 3a, and has only the contact portion 8 without the terminals as described above. The output terminal 10 is connected to the lowermost coil substrate 3c at a position opposite to the coil substrate 3a of the circuit 5.

As shown in FIG. 4, the coil substrates 3a, 3b, 3c having the above-described structure are superposed on each other such that a plurality of coil substrates 3b (three in this embodiment) are sandwiched between the coil bases 3a, 3b. Then, one coil set 1 is configured (see FIG. 5). Then, in this state, the contact points 8 of the circuits of the respective coil substrates 3a are brought into contact with each other so that a current flows from one coil substrate 3a to the adjacent coil substrates 3b and 3c. As shown in FIG. 6, the coil set 1 as described above is further stacked in multiple stages to form a main part of the transformer.

In the combination of the coil set 1 as shown in FIG. 6, the secondary side voltage can be variously set by appropriately selecting the connection to the terminals 6a ..., 10a. For example, the terminal 6a serves as an input terminal on the primary side, the terminal 10a and the terminal 6b are connected, and the terminal 10b serves as an output terminal on the primary side. In this case, it is possible to use the terminal 6c as the secondary side input terminal and the terminal 10c or 10d as the output terminal.

In the above embodiment, the number of turns of the circuit 5 on the coil substrate 3a is the same, but the number of turns may be different between the primary side and the secondary side, for example. Further, the circuit 5 may be formed only on one surface of the coil substrate 3a .... Further, as shown in FIG. 7, one coil set may be composed of one coil substrate. FIG. 7 shows an example in which the input terminal 11 and the output terminal 12 are attached to one coil board 3d, and the front and back surfaces of the coil board 3d are shown similarly to FIG.

Next, the configuration of the coil board 3a as described above will be described in more detail. FIG. 8 is an enlarged view showing a cross section of the contact portion 8 of the coil substrate 3a. In the figure, reference numeral 20 is a base, which is made of, for example, glass epoxy resin. A copper circuit 5 having a predetermined pattern is formed on the substrate 20 by a known printing technique. The front and back surfaces of the base 20 are covered with an insulating layer 21 so as to cover the circuit 5 and the gap between the circuits 5. The insulating layer 21 is not provided on the contact portion 8. The coil board 3a configured as described above is superposed so that the coil board 3b and the contact portions 8 thereof are in contact with each other.

In the transformer having the above structure, since the circuit 5 forming the coil is formed by printing, the manufacturing is extremely simple, and an accident such as a short circuit or disconnection of the circuit 5 is unlikely to occur. Moreover, even if the number of turns of the coil is large, the size and weight can be reduced. Furthermore, by appropriately changing the number of turns of the coil of the coil substrate on the primary side and the secondary side, it is possible to perform large voltage conversion with a small structure. Furthermore, since the interval between the conductors of the circuit 5 can be made constant with extremely high accuracy, a power efficiency as high as 85% can be obtained as compared with the conventional 50%, and the power consumption can be drastically reduced. It can be reduced.

Although the substrate 20 is made of glass epoxy resin in the above embodiment, it may be made of aluminum. In this case, the front and back surfaces of the substrate 20 are coated with an insulating coating before the circuit 5 is printed. The base material 20 can be made extremely thin, about 0.1 mm, by using aluminum as the material having high strength. In the case of glass epoxy, the thinnest is 0.35 mm. Further, as the material of the base 20, any material such as a film sheet for photographic film and synthetic paper can be used.

Next, FIG. 8 shows another embodiment of the present invention in which the circuit of the coil substrate has a multi-layer structure. In this embodiment, the circuit 31 is formed by printing on the front and back surfaces of the substrate 30, the insulating layer 32 is covered so as to cover the circuit 31 and the entire gap, and the circuit 33 is formed on the upper surface of the insulating layer 32. The insulating layer 34 is covered therewith. In such a coil substrate, the circuit 31 and the circuit 33 are connected to each other by forming the next circuit 33 without providing an insulating layer in the portion to be connected to the circuit 31. In this example, the two layers of circuits 31 and 33 are formed on one surface of the base body 30, but more layers may be formed. Further, the substrate may have a shape other than the flat plate shape, such as a spherical shape.

[0017]

[Effect of device]

 As described above, according to the present invention, since the circuit that constitutes the coil is provided on the surface of the base with the coil set formed by stacking a plurality of coil substrates formed by printing, the manufacturing is extremely simple. In addition, an accident such as a short circuit or disconnection of a circuit is hard to occur, and further, an excellent effect such as a large reduction in power consumption can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a coil set of a transformer according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a transformer of the embodiment.

FIG. 3 is a plan view showing front and back surfaces of a coil substrate.

FIG. 4 is an exploded perspective view showing a coil set.

FIG. 5 is a perspective view showing a coil set.

FIG. 6 is a perspective view showing a state in which coil sets are superposed.

FIG. 7 is a plan view showing front and back surfaces of another coil substrate.

FIG. 8 is a cross-sectional view showing details of a coil substrate.

FIG. 9 is a cross-sectional view showing another example of the coil substrate.

[Explanation of symbols]

 1 coil set 2 iron cores 3a, 3b, 3c coil substrate

Claims (7)

[Scope of utility model registration request] 1. A transformer comprising a coil set formed by stacking a plurality of coil substrates on each of which a circuit forming a coil is formed by printing on a surface of a substrate. 2. The transformer according to claim 1, wherein the coil substrate has circuits forming coils on both sides thereof, and the front and back ends of the circuit are connected to each other. vessel. 3. The transformer according to claim 1, wherein the substrate is made of glass epoxy resin. 4. The transformer according to claim 1, wherein the base body is formed by coating an insulating layer on a surface of an aluminum plate. 5. The transformer according to claim 1, wherein the substrate is made of a film sheet. 6. The transformer according to claim 1, wherein the base is made of synthetic paper. 7. At least a portion of the coil set comprises:
6. The substrate according to claim 1, wherein a plurality of circuit layers each including a circuit forming a coil and an insulating layer covering the upper surface of the circuit are provided on one base. The transformer described in Crab.