JPH0217924B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to high frequency transformers such as switching transformers and pulse transformers, which are used in various electrical devices.

<Prior art> In general, in high-frequency transformers such as switching transformers and pulse transformers, the winding widths of the primary coil and secondary coil are set to be approximately the same in order to obtain a transformer with good waveform transmission characteristics. It is known to reduce leakage flux and to reduce interlayer capacitance by winding a primary coil and a secondary coil with a certain distance between them.

In a conventional high-frequency transformer, the primary coil and the secondary coil are wound using a conductor wire 32 having an insulating coating 31 coated on the outer periphery of a core wire 30 made of a conductor, as shown in FIG. It was something like that.

<Problems to be Solved by the Invention> However, in such a configuration, as shown in FIG.
There are only line capacitance Cs and inductance component Ls unique to the two configurations, and there is no means for damping (braking) the voltage of the conductor 32. 36 is the primary coil, 37 is the secondary coil, Z ₁ is the internal resistance of the signal source 38, and Z ₀ is the load resistance), as is clear from the frequency characteristics shown in FIG. There are resonance points at b, c, and d, and the resonance state at b among these resonance points causes ringing (R), as is clear from the response waveform for the frequency characteristics shown in Figure 10. , it is not possible to obtain good waveform transmission characteristics,
This had the following problem.

On the other hand, as shown by the broken line in the example circuit used in FIG. 8, an external correction capacitor Cc is attached to the secondary coil 37 side.
It has been considered to remove ringing by connecting a correction resistor R, etc., but in this case, the 11th
As shown in the figure, ringing (R) remained in the response waveform to the frequency characteristics, and it was still impossible to obtain good waveform transmission characteristics.

As shown in Fig. 9, when there are multiple resonance points in the frequency characteristics, the capacitive component is used to cut off the high frequency portion in order to eliminate ringing, which either significantly sacrifices the frequency characteristics, or
Consideration must be given to implementing complex corrections.

<Means for Solving the Problems> The present invention has been made in order to solve the above problems, and includes a transformer in which a primary coil and a secondary coil are wound around a wound portion. The conductor of some or all of the conductor wires is brought into direct contact with a conductive member provided on the outer periphery of the conductor or the wound portion of the conductor.

<Example> Hereinafter, an example of the transformer of the present invention will be described in detail with reference to the drawings. In Fig. 1, 1 is a core for a transformer, and a primary coil 3 and a secondary coil 4 are connected to a wound part 2 (core 1) through a wound part 2 consisting of a coil bobbin. Wrapped in layers. As shown in FIG. 2, the primary coil 3 wound around the wire-wound portion 2 includes a conductor 5 made of copper wire or the like.
A conductive member 6 was directly provided (contacted) on the outer periphery of the
It is made up of conductive wires 7. here,
Copper wire, aluminum wire, etc. commonly known as "electric wire" consist of a conductive part (conductor) whose purpose is to conduct current, and an insulating part whose purpose is to insulate it from the surrounding space. Instead of the insulating part, for example, a conductive member containing carbon and having a higher resistance value than the conductor 5 is provided at the position of the insulating part and is defined as the conductive member 6, so that the current, which is the main signal, is passes through the conductor 5, and almost no main signal passes through the conductive member 6.

In the transformer having such a configuration, the primary coil 3 is wound around the wound portion 2 using the conducting wire 7 in which the conductive member 6 is provided directly on the outer periphery of the conductor 5, so that the distance between the conductor 5 and the conductive member 6 is reduced. There is no insulating layer between the conductors 5, and as shown in FIG.
and an inductance component 10 exist, and as a result, the equivalent resistance 9 existing between the conductors 5 effectively damps the voltage of the primary coil 3 to a minute section of the coil 3, and the circuit used as shown in FIG. According to an example (in the figure, 1 is the core, 3 is the primary coil, 4 is the secondary coil, 11 is the internal resistance of the signal source 12, and 13 is the load resistance), as shown in FIG.
Ringing will not occur in the response waveform to the frequency characteristics.

In one embodiment of the transformer of the present invention, only the primary coil has been described, and the primary coil is constructed using a conductive wire in which a conductive member is brought into direct contact with the outer periphery of the conductor. Alternatively, it goes without saying that both the primary coil and the secondary coil may be constructed using a conductive wire in which a conductive member is brought into direct contact with the outer periphery of the conductor. Furthermore, in the embodiments of the present invention, the conductive wire constituting the coil has been described in which the conductive member is brought into direct contact with the outer periphery of the conductor. A conductive member may be provided on the surface of the wire portion so as to be in contact with the conductive member of the coil, or the entire coil may be further covered with a separate conductive member. In this case, between the conductor of the conductor and the conductive member , there is no insulating layer between the conductive member on the outer periphery of the conductor and the conductive member on the wound portion, or between the conductive member on the outer periphery of the coil, and the same effect as in the embodiment is produced. Furthermore, in one embodiment of the present invention, a coil is wound around a part to be wound using a conductor wire with a conductive member provided directly on the outer periphery of the conductor. A coil may be wound using a provided ordinary conductive wire, and a conductive member may be provided on the surface of the wound portion so as to be in contact with the coil. In this case, the conductive member provided on the wound portion of the conductive wire. The conductor coating is removed from the part that contacts the conductor, and the conductor is brought into direct contact with the conductive member of the wound part. Furthermore, a naked wire such as a tin wire may be used as the conductor of the coil.
It is effective if applied when the coil winding distribution is sparse with respect to the wound portion. In one embodiment of the present invention, a coil bobbin is used as the winding part, but a core is used as the winding part without using a coil bobbin, and the coil is wound directly around the core. It is good to have
It can also be applied to air-core coils that do not use a core.
The structure of the transformer can be changed and modified as necessary, such as being applicable to a structure consisting only of a primary coil such as a chiyoke coil.

<Effects of the Invention> As described above, according to the transformer of the present invention,
In a transformer in which at least a primary coil is wound around a wound part, the conductor of some or all of the conductors constituting the coil has a resistance value higher than that of the conductor provided on the outer periphery of the conductor or in the wound part. It is brought into direct contact with a conductive member having a large diameter, and produces the following effects. In other words, the voltage is damped by the resistance component of the coil itself (equivalent resistance existing between conductors), and the capacitance component does not play any role in damping, and it is effective even in minute sections of the coil without sacrificing frequency characteristics. This eliminates ringing and provides good waveform transmission characteristics.

In addition, ringing can be removed more reliably than when an external correction means (capacitance, resistance, etc.) is attached to remove ringing, and in addition to improving waveform transmission characteristics, the number of parts and costs can be reduced. That's what you get. As described above, according to the present invention, ringing can be removed with a simple configuration without impairing frequency characteristics, and the present invention will become increasingly effective in the future, especially as a high frequency transformer.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional side view of the main parts of a transformer according to an embodiment of the present invention, Fig. 2 is a schematic configuration diagram of the coil, Fig. 3 is a schematic equivalent circuit diagram between conductors constituting the coil, and Fig. 4 is a schematic circuit diagram of an example of a circuit using a transformer, FIG. 5 is a response waveform diagram for frequency characteristics, FIG. 6 is a schematic configuration diagram of a coil used in a conventional transformer, and FIG. 7 is a conductor constituting the coil. Schematic equivalent circuit diagram between
The figure is also a schematic circuit diagram of an example of a circuit using a transformer.
FIG. 9 is a frequency characteristic waveform diagram, FIG. 10 is a response waveform diagram for the frequency characteristic, and FIG. 11 is a response waveform diagram for the frequency characteristic with the correcting means externally attached. 2... Winding portion, 3... Primary coil, 5... Conductor, 6... Conductive member, 7... Leading wire.

Claims (1)

[Claims] 1. In a transformer in which at least a primary coil is wound around a wound part, a conductor of some or all of the conductive wires constituting the coil is provided on the outer periphery of the conductor or on the wound part. A transformer characterized by being in direct contact with a conductive member having a higher resistance value than the conductor.