JP6792477B2 - Transformer - Google Patents

Description

The present invention relates to a transformer having a capacitor for bypassing a power line communication signal.

Conventionally, power line communication (PLC: Power Line Communication) using a power line as a communication line has been performed (see, for example, Non-Patent Document 1). Such power line communication has an advantage that communication can be performed between devices without separately arranging a line for communication.

"Power line carrier communication", [online], 2016, [Search on December 8, 2016], Internet (URL: https://ja.wikipedia.org/wiki/%E9%9B%BB%E5%8A% 9B% E7% B7% 9A% E6% 90% AC% E9% 80% 81% E9% 80% 9A% E4% BF% A1)

However, as described in Non-Patent Document 1, in a single-phase three-wire power line used in a home or the like, between a device connected to the L1 phase and a device connected to the L2 phase. It is known that the signal of the power line communication is greatly attenuated and it is difficult to perform the power line communication. Such problems are due to the significant attenuation of power line communication signals as they pass through the transformer windings. As such, there is usually the problem that power line communication signals are significantly attenuated as they pass through the transformer.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a transformer capable of passing a power line communication signal.

In order to achieve the above object, the transformer according to the present invention is a transformer having a capacitor for bypassing a signal of power line communication, and is wound around an iron core, a primary winding wound around the iron core, and an iron core. It is provided with a rotated plate-shaped secondary winding and a conductive plate-shaped member that forms a capacitor between the secondary winding and the secondary winding at the end of the secondary winding. is there.
With such a configuration, the power line communication signal can be bypassed via the capacitor. Therefore, for example, in a single-phase three-wire power line, power line communication can be performed between the L1 phase and the L2 phase. Further, by forming the capacitor by using the end of the secondary winding, the space required for the capacitor can be reduced. As a result, the bypass capacitor for the power line communication signal can be arranged without increasing the size of the transformer.

Further, in the transformer according to the present invention, the power line communication signal may be bypassed by the capacitor between one end of the primary winding and one end of the secondary winding.
With such a configuration, the power line communication signal can be bypassed between the primary side and the secondary side of the transformer.

Further, in the transformer according to the present invention, the signal of power line communication may be bypassed between one end and the other end of the secondary winding by the capacitor.
With such a configuration, the power line communication signal can be bypassed between one end and the other end of the secondary side of the transformer. As a result, for example, in a single-phase three-wire power line, power line communication can be performed between the L1 phase and the L2 phase.

Further, in the transformer according to the present invention, the primary winding is concentrically arranged on the outside of the secondary winding, and the plate-shaped member exists between the primary winding and the secondary winding. You may.
With such a configuration, it becomes possible to effectively utilize the space existing in the conventional transformer and install a capacitor for bypassing the power line communication signal.

According to the transformer according to the present invention, the power line communication signal can be bypassed by a capacitor, and the capacitor can be arranged in a space-saving manner.

External view of the transformer according to the embodiment of the present invention The figure which shows the winding of the transformer by the same embodiment. Perspective view of the secondary winding of the transformer according to the same embodiment. Front view of the secondary winding of the transformer according to the same embodiment Top view of the secondary winding of the transformer according to the same embodiment Perspective view of another example of the secondary winding of the transformer according to the same embodiment. Front view of another example of the secondary winding of the transformer according to the same embodiment. Front view of another example of the secondary winding of the transformer according to the same embodiment. A circuit diagram showing an example of a transformer circuit configuration according to the same embodiment. A circuit diagram showing an example of a transformer circuit configuration according to the same embodiment. A circuit diagram showing an example of a transformer circuit configuration according to the same embodiment. Front view of another example of the secondary winding of the transformer according to the same embodiment. Top view of another example of the secondary winding of the transformer according to the same embodiment. Front view of another example of the secondary winding of the transformer according to the same embodiment. External view of another example of the transformer according to the same embodiment

Hereinafter, the transformer according to the present invention will be described with reference to embodiments. In the following embodiments, the components with the same reference numerals are the same or correspond to each other, and the description thereof may be omitted again. In the transformer according to the present embodiment, the winding on the secondary side is plate-shaped, and a capacitor for bypassing the power line communication signal is formed between one end of the winding and the plate-shaped member. ..

FIG. 1 is an external view of the transformer 1 according to the present embodiment, FIG. 2 is a view showing a winding of the transformer 1, and FIG. 3A is a perspective view of one of the secondary windings. 3B is a front view of the secondary winding, and FIG. 3C is a plan view of the secondary winding.

The transformer 1 includes primary windings 2a and 2b, secondary windings 3a and 3b, an iron core 4, and a plate-shaped member 5. The transformer 1 may be, for example, a transformer for power distribution. The transformer for power distribution may be, for example, a pole transformer that transforms a high voltage of about 6 kV to a low voltage of 100 V or 200 V. The transformer 1 may be, for example, a molded transformer hardened with a resin mold, an oil-immersed transformer using insulating oil as a cooling medium, or another transformer. Good.

The primary windings 2a and 2b and the secondary windings 3a and 3b are respectively wound around the iron core 4. As shown in FIGS. 1 and 2, in the winding A, the primary winding 2a is concentrically arranged outside the secondary winding 3a, and also in the winding B, the primary winding The 2b is concentrically arranged on the outside of the secondary winding 3b. The secondary windings 3a and 3b are made of a plate-shaped conductive material, for example, as shown in FIG. 3A and the like. The width of the conductive material (length in the lateral direction) does not matter, but it is preferable that the conductive material has a width sufficient to form a capacitor having a capacity sufficient to bypass the power line communication signal.

The plate-shaped member 5 forms a capacitor 6 at the end 3a-1 of one of the secondary windings 3a with the secondary winding 3a. The capacitor 6 is used to bypass the signal of power line communication. Further, the fact that the capacitor 6 is formed between the plate-shaped member 5 and the end portion 3a-1 means that the capacitor 6 having the plate-shaped member 5 and the end portion 3a-1 as electrodes is formed. Is. The capacitor 6 shown in FIGS. 3A to 3C is formed between the outermost winding of the secondary winding 3a and the plate-shaped member 5. It is preferable that the plate-shaped member 5 is fixed so that the distance from the end portion 3a-1 is constant. Further, the plate-shaped member 5 is usually a flat member, but it does not have to be. For example, the plate-shaped member 5 may have a curved shape or the like. Further, the plate-shaped member 5 has the same shape as the end portion 3a-1, and it is preferable that the plate-shaped member 5 is fixed in parallel with the end portion 3a-1. For example, as shown in FIGS. 3A to 3C, when the end portion 3a-1 has a flat plate shape, the plate-shaped member 5 is a flat plate provided in parallel with the flat plate-shaped end portion 3a-1. You may. Further, when the end portion 3a-1 has a curved shape, the plate-shaped member 5 may be a curved member provided in parallel with the curved end portion 3a-1. The plate-shaped member 5 is assumed to have conductivity. The conductive material of the plate-shaped member 5 may be the same as the conductive material of the secondary winding 3a. For example, a spacer or the like for keeping the distance between the plate-shaped member 5 and the end portion 3a-1 may be constant. Further, the plate-shaped member 5 includes, for example, a frame body around which the secondary winding 3a is wound (not shown), a frame body around which the primary winding 2a is wound (not shown), and a winding. The distance from the end portion 3a-1 of the secondary winding 3a may be kept constant by being fixed to the case or the like. The plate-shaped member 5 shown in FIGS. 3A to 3C is provided on the outer peripheral side of the secondary winding 3a. The secondary winding 3b in which no capacitor is formed at the end may be a plate-shaped winding similar to the secondary winding 3a except that the plate-shaped member 5 does not exist at the end.

The method of power line communication in which the signal is bypassed by the capacitor 6 is not limited, but for example, power line communication using a frequency of 1 MHz or higher may be used, and power line communication using a band of 2 MHz to 30 MHz (so-called high speed). It may be PLC), or it may be power line communication using other frequencies.

Although the capacitor 6 can pass a signal for power line communication, it is preferable that the capacitor 6 does not pass power of a commercial power frequency such as 50 Hz or 60 Hz. Since the impedance of the capacitor 6 is inversely proportional to the frequency, it becomes high impedance at a low frequency of about the commercial power supply frequency and low impedance at a high frequency of about the power line communication frequency. Further, when the transformer 1 is for power distribution, a high voltage may be applied. Therefore, it is preferable that the capacitor 6 has a high withstand voltage. A dielectric may be inserted between the plate-shaped member 5 and the end portion 3a-1 of the secondary winding 3a. This is to increase the capacity of the capacitor 6. The dielectric may be, for example, ceramic, paper, resin, insulating oil, or the like. For example, when the transformer 1 is a molded transformer or an oil-filled transformer, the mold resin or insulating oil may be inserted between the plate-shaped member 5 and the end portion 3a-1. Therefore, the transformer 1 may be configured so that the mold resin or the insulating oil can flow between the plate-shaped member 5 and the end portion 3a-1. Specifically, in the frame or the like around which the primary winding 2a and the secondary winding 3a are wound, a hole or a gap through which the mold resin or insulating oil can enter is provided at a position near the capacitor 6. It may be. By doing so, the work of inserting a dielectric between the electrodes of the capacitor 6 becomes unnecessary. Further, a part of a frame or the like around which the primary winding 2a and the secondary winding 3a are wound may be inserted between the plate-shaped member 5 and the end portion 3a-1. The frame or the like may be made of resin, for example.
In order to reduce the influence of the primary winding, an electrostatic shield (for example, sandwiching a grounded metal plate member) may be provided between the plate-shaped member 5 and the primary winding 2a.

As shown in FIG. 2, since the primary side winding 2a exists on the outer peripheral side of the secondary side winding 3a, the plate-shaped member 5 is placed between the primary side winding 2a and the secondary side winding 3a. Will exist in. Normally, there is a slight gap between the primary winding 2a and the secondary winding 3a that are arranged concentrically. Therefore, in the above case, the plate-shaped member 5 exists in the gap, and the plate-shaped member 5 can be arranged by effectively utilizing the existing space. When the plate-shaped member 5 exists between the primary side winding 2a and the secondary side winding 3a, the plate-shaped member 5 is located closer to the secondary side winding 3a than the primary side winding 2a. It is preferable to be arranged in. That is, it is preferable that the plate-shaped member 5 is arranged at a position closer to the outer peripheral surface of the secondary winding 3a than to the inner peripheral surface of the primary winding 2a. This is so that the capacitor 6 is formed between the plate-shaped member 5 and the end portion 3a-1 of the secondary winding 3a.

The plate-shaped member 5 is connected to a destination where the power line communication signal is desired to be bypassed by a line made of a conductive material. For example, the plate-shaped member 5 may be connected to the other ends of the secondary windings 3a and 3b by a line. In that case, the capacitor 6 bypasses the power line communication signal between one end and the other end of the secondary windings 3a and 3b. The one end and the other end of the secondary windings 3a and 3b are ends connected to the power line on the secondary side. For example, one end corresponding to the L1 phase and one end corresponding to the L2 phase. There may be. FIG. 4A is a circuit diagram showing a transformer 1 having such a connection configuration. In FIG. 4A, the primary windings 2a and 2b are connected in series, and the secondary windings 3a and 3b are also connected in series. Further, one end 2a-1 of the primary winding 2a is connected to the line P1, and the other end 2a-2 is connected to one end 2b-1 of the primary winding 2b. One end 2b-2 of the primary winding 2b is connected to the line P2. Further, one end 3a-1 of the secondary winding 3a is connected to the line L1, and the other end 3a-2 is connected to one end 3b-1 of the secondary winding 3b. One end 3b-2 of the secondary winding 3b is connected to the line L2. It is assumed that the connection relationship between the primary windings 2a and 2b and the secondary windings 3a and 3b and the lines P1, P2, L1 and L2 is the same in the circuit diagrams of FIGS. 4B and 4C. In addition, each line P1, P2, L1, L2 may be a line of a conductive material connected to the terminal of a winding independently, or the winding conductor constituting the winding is extended. It may be. When the transformer 1 is a single-phase three-wire system, the terminals 3a-2 and 3b-1 may be connected to, for example, a neutral wire. Further, the neutral wire may be used as a ground wire, for example. When connected as shown in FIG. 4A, a power line communication signal can be transmitted and received between the device connected to the line L1 side and the device connected to the line L2 side via the capacitor 6. Will be. Therefore, in a single-phase three-wire power line, power line communication can be performed between different phases.

Further, for example, the plate-shaped member 5 may be connected to one end of the primary windings 2a and 2b by a line made of a conductive material. In that case, the capacitor 6 bypasses the power line communication signal between one end of the primary windings 2a and 2b and one end of the secondary windings 3a and 3b. One end of the primary windings 2a and 2b is one end connected to the power line on the primary side. Normally, the primary windings 2a and 2b have two ends, but the plate-shaped member 5 may be connected to either side. 4B and 4C are circuit diagrams showing a transformer 1 having such a connection configuration. A circuit diagram in which the line connected to the capacitor 6 is connected to the line P1 is shown in FIG. 4B, and a circuit diagram in which the line connected to the capacitor 6 is connected to the line P2 is shown in FIG. 4C. If the transformer 1 is shown in FIG. 4B, and if there is a transformer that bypasses the transformer between the line P1 and the line L1 in other transformers connected to the line P1, the transformer 1 is shown in FIG. 4B. Power line communication can be performed between the device connected to the line L1 of the transformer 1 and the device connected to the line L1 of another transformer. The same applies when the transformer 1 is the one shown in FIG. 4C.

In the circuit diagrams of FIGS. 4A to 4C, the case where the line L1 and the other line are connected by the capacitor 6 has been described, but the line L2 and the other line are connected by the capacitor 6. Needless to say, it's okay. In that case, for example, the capacitor 6 may be formed by the end portion 3b-2 of the secondary winding 3b and the plate-shaped member 5. Further, the transformer 1 may have a plurality of capacitors 6 for bypassing. For example, the transformer 1 may have a capacitor 6 that connects the line P1 and the line L1 and a capacitor 6 that connects the line P2 and the line L2. In that case, a capacitor 6 is formed between the end portion 3a-1 of the secondary winding 3a and the plate-shaped member 5, and the end portion 3b-2 of the secondary winding 3b and another plate-shaped member are formed. Another capacitor 6 will be formed with 5. Further, for example, the transformer 1 has a capacitor 6 for connecting the line P1 and the line L1, a capacitor 6 for connecting the line P2 and the line L2, and a capacitor 6 for connecting the line L1 and the line L2. You may. In that case, it is necessary to form two capacitors 6 at the end 3a-1 of the secondary winding 3a or the end 3b-2 of the secondary winding 3b. Therefore, for example, as shown in FIG. 3D, at the end 3a-1 of the secondary winding 3a, a capacitor 6a is formed with the plate-shaped member 5a, and a capacitor 6b is formed with the plate-shaped member 5b. May be formed.

Further, in the present embodiment, as shown in FIGS. 3A to 3D, the secondary winding 3a which is a single layer in the winding axis direction, that is, each turn does not traverse in the winding axis direction. Although the next winding 3a has been described, it does not have to be. As shown in FIGS. 5A and 5B, a secondary winding 3a having multiple layers in the winding axis direction, that is, a secondary winding 3a having a turn traversing in the winding axis direction is used. You may do so. The winding axis direction is, for example, the direction perpendicular to the paper surface in FIGS. 3B and 5A. FIG. 5A is a front view of the secondary winding 3a, and FIG. 5B is a plan view of the secondary winding 3a. The secondary winding 3a shown in FIGS. 5A and 5B may be a wound wire. Also in the secondary winding 3a shown in FIGS. 5A and 5B, the capacitor 6 is formed between the end portion 3a-1 and the plate-shaped member 5. As is clear from FIG. 5B, not only the end portion 3a-1 of the secondary side winding 3a but also the secondary side winding 3a separated from the end portion 3a-1 is located in the vicinity of the plate-shaped member 5. There will also be places. Therefore, when the plate-shaped member 5 is enlarged, a capacitor is also formed between the plate-shaped member 5 and the portion of the secondary winding 3a other than the end portion 3a-1, and the power line communication is performed. The noise can be high. Therefore, it is preferable that the plate-shaped member 5 is arranged so that the portion of the secondary winding 3a other than the end portion 3a-1 does not exist in the vicinity of the plate-shaped member 5. For example, as shown in FIG. 5C, in the secondary winding 3a, the end 3a-1 is provided at a position away from the winding portion of the secondary winding 3a, and the end 3a-1 is provided. A capacitor 6 may be formed between the plate-shaped member 5 and the plate-shaped member 5.

Further, in the present embodiment, as shown in FIG. 3A and the like, the case where the capacitor is formed at the position of the end portion 3a-1 on the outer peripheral side of the secondary winding 3a has been described, but this is not the case. May be good. A capacitor may be formed at the position of the end portion 3a-2 on the inner peripheral side of the secondary winding 3a. In that case, a capacitor is formed by the end portion 3a-2 and the plate-shaped member 5.

Further, in the present embodiment, the case where the secondary windings 3a and 3b are all plate-shaped windings has been described, but this may not be the case. The transformer 1 may further include a non-plate-shaped secondary winding in addition to the plate-shaped secondary winding. For example, the secondary winding 3b does not have to be plate-shaped. In that case, the transformer 1 is provided with a plate-shaped secondary winding 3a and a non-plate-shaped secondary winding 3b. Even in that case, it is assumed that a capacitor for bypassing the power line communication signal is formed between the plate-shaped secondary winding and the plate-shaped member.

As described above, according to the transformer 1 according to the present embodiment, by providing the capacitor 6, the power line communication signal transmitted via the power line connected to the transformer 1 bypasses the winding. Can be done. As a result, the power line communication signal can pass through the transformer 1. For example, when the L1 phase and the L2 phase of a single-phase three-wire transformer 1 are connected by a capacitor 6, power line communication between different phases becomes possible on the secondary side of the transformer. Further, when the primary side and the secondary side of the transformer 1 are connected by the capacitor 6, power line communication via the power line on the primary side becomes possible. Further, by forming the capacitor 6 between the end portion 3a-1 of the secondary winding 3a and the plate-shaped member 5, the transformer 1 as a whole can be miniaturized. This is because the end portion 3a-1 of the secondary winding 3a can be used as one of the two electrodes of the capacitor. Normally, since the transformer is designed to be as small as possible, it is difficult to secure a space for arranging the bypass capacitor, but it is limited by configuring the capacitor 6 as described above. The capacitor 6 can be added even in the space. Further, by arranging the plate-shaped member 5 forming the capacitor 6 between the inner secondary winding 3a and the outer primary winding 2b, the space of the transformer 1 can be effectively used. This makes it possible to add a bypass capacitor 6 while maintaining the current size of the transformer as much as possible. This is because there is usually some space between the primary winding 2a and the secondary winding 3a.

Needless to say, the shape and size of the plate-shaped member 5 are not limited to those described above. For example, as shown in FIGS. 3E and 3F, the end portion 3a-1 of the secondary winding 3a has a plate-shaped member 5 having a larger area along the length direction of the secondary winding 3a. May be provided. By doing so, the capacity of the capacitor 6 can be further increased.

Further, in the above embodiment, the single-phase three-wire transformer 1 has been mainly described, but also in other power distribution type transformers, it is formed between the end of the secondary winding and the plate-shaped member. A capacitor may be used to allow the power line communication signal to bypass the transformer.

Further, the configuration of the transformer 1 according to the above embodiment is an example, and in the transformers having other configurations, as in the case of the transformer 1, the end portion of the plate-shaped secondary winding and the plate-shaped member Needless to say, a capacitor for bypassing the power line communication signal can be formed between the two. For example, in the above embodiment, the inner iron type transformer 1 has been described, but in the outer iron type transformer 1a shown in FIG. 6, similarly, at the end of the secondary winding 3c, A plate-shaped member for forming a capacitor may be provided between the plate-shaped secondary winding 3c. The outer iron type transformer 1a of FIG. 6 includes iron cores 4a and 4b, a primary side winding 2c wound around iron cores 4a and 4b, and a secondary side winding 3c wound around iron cores 4a and 4b. , A plate-shaped member (not shown) is provided. The secondary winding 3c may be the same as the secondary winding 3a described above. Needless to say, the number of turns of the secondary winding 3a is not limited to that shown in FIG. 3A and the like.

Further, it goes without saying that the present invention is not limited to the above embodiments, and various modifications can be made, and these are also included in the scope of the present invention.

From the above, according to the transformer according to the present invention, it is possible to obtain the effect that a capacitor that bypasses the power line communication signal can be formed in a space-saving manner, and it is useful as, for example, a transformer for distribution.

1, 1a Transformer 2a, 2b, 2c Primary side winding 3a, 3b, 3c Secondary side winding 4, 4a, 4b Iron core 5, 5a, 5b Plate-shaped member 6, 6a, 6b Capacitor

Claims (4)

A transformer that has a capacitor for bypassing power line communication signals.
With the iron core
The primary winding wound around the iron core and
A plate-shaped secondary winding wound around the iron core,
A transformer comprising a conductive plate-shaped member forming the capacitor with the secondary winding at the end of the secondary winding. The transformer according to claim 1, wherein the capacitor bypasses a signal for power line communication between one end of the primary winding and one end of the secondary winding. The transformer according to claim 1, wherein the power line communication signal is bypassed between one end and the other end of the secondary winding by the capacitor. The primary winding is concentrically arranged outside the secondary winding.
The transformer according to any one of claims 1 to 3, wherein the plate-shaped member exists between the primary winding and the secondary winding.

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