JPH07161532A - Pulse transformer - Google Patents

Abstract

PURPOSE:To obtain a pulse transformer in which primary and secondary conductor windings are wound alternately around a troidal core at a constant interval by simple method. CONSTITUTION:Primary and secondary conductor windings 1, 2 are bonded integrally through an insulating strip spacer 3 having thickness substantially equal to the diameter of the conductor thus producing a composite member. The composite member can be wound uniformly and spirally at a constant pitch around a troidal core while keeping a constant interval between adjacent primary and secondary conductor windings 1, 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided in data communication using pulse code communication or modulation / demodulation for ensuring insulation between a transmission line side and a transmitter / receiver side, or for removing common mode noise. The present invention relates to a pulse transformer in which primary conductor windings and secondary conductor windings are alternately and evenly wound with a constant spacing therebetween by a simple method.

[0002]

2. Description of the Related Art In data communication using pulse code communication or modulation / demodulation, the insulation between the transmission line side and the transmitter / receiver side is ensured,
Or, a pulse transformer (pulse transformer) provided to remove common mode noise generally has a high common mode noise rejection ratio to improve noise resistance and a low leakage inductance to improve frequency characteristics. There must be. Therefore, it is necessary to reduce the capacitance between the primary and secondary windings.
Increase the distance between the secondary and secondary windings as much as possible. On the other hand, in order to satisfy the requirement, the electromagnetic coupling of the primary and secondary windings must be increased. Therefore, in order to satisfy, usually a toroidal core (ring-shaped magnetic core, hereinafter referred to as core)
The winding method is used.

Conventionally, there are the following two methods for winding around the core. First, as shown in the cross-sectional view of one conventional example in FIG. 4, first, a primary conductor winding 1 is wound around a core 9, an insulating layer 8 is formed thereon, and a secondary conductor winding 2 is formed thereon. It is a method of winding. Second, as shown in the perspective view of FIG. 5, the primary conductor winding 1 indicated by a solid line and the secondary conductor winding 2 indicated by a broken line are alternately and evenly wound on the core 10. Is the way.

[0004]

The first method has a drawback that the electromagnetic coupling between the primary winding 1 and the secondary winding 2 is deteriorated and the leakage inductance is increased. In the second method, the capacity between the primary conductor winding 1 and the secondary conductor winding 2 can be reduced, and the electromagnetic coupling between the primary conductor winding 1 and the secondary conductor winding 2 can be achieved. Has the advantage that the leakage inductance is small and the leakage inductance can be reduced, but on the other hand, the primary conductor winding 1
There is a problem that it is technically difficult to alternately and evenly wind the secondary conductor windings 2 while keeping the distance between them constant.

The problem to be solved by the present invention is to solve the above-mentioned problems of the prior art by a simple method.
It is an object of the present invention to provide a pulse transformer in which a primary conductor winding and a secondary conductor winding are alternately and evenly wound on a toroidal core while keeping a constant interval.

[0006]

A pulse transformer according to a first aspect of the present invention comprises a composite member integrally formed by interposing a strip-shaped insulating spacer between a primary conductor winding and a secondary conductor winding. , Spirally wound around the ring-shaped magnetic core at a constant pitch. The pulse transformer according to claim 2 includes a primary conductor winding and a secondary conductor winding.
A composite member integrally formed by interposing one or more rod-shaped insulating spacers in a line with the next conductor winding is spirally wound around a ring-shaped magnetic core at a constant pitch.

A pulse transformer according to claim 3 is the pulse transformer according to claim 1.
Alternatively, in the transformer according to the second aspect, the composite member is wound so that the adjacent primary conductor windings and the secondary conductor windings have an equal interval.

[0008]

According to the present invention, the composite member integrally formed by interposing the strip-shaped insulating spacer between the primary conductor winding and the secondary conductor winding has a spiral shape with a constant pitch on the ring-shaped magnetic core. Or one or more rod-shaped insulating spacers are arranged between the primary conductor winding and the secondary conductor winding in a line, and the primary conductor winding and the secondary conductor winding line are Since the composite member integrally molded so that the distance between the two can be changed is spirally wound around the ring-shaped magnetic core at a constant pitch, the primary conductor winding and the secondary conductor winding have a fixed positional relationship alternately. It is kept and wound. Furthermore, since the composite member is wound so that the intervals between the adjacent primary conductor windings and secondary conductor windings are equalized, the primary conductor windings and the secondary conductor windings are alternately arranged. It is possible to wind completely evenly at intervals.

[0009]

Embodiments of the pulse transformer according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the composite member of the first embodiment. A band-plate-shaped insulating spacer 3 having substantially the same thickness as the wire diameter is interposed between the primary conductor winding 1 and the secondary conductor winding 2 and integrally molded with an adhesive to obtain a composite member.

FIG. 2 is a perspective view of the first embodiment. The above-described composite member is spirally wound around the core (toroidal core) 10 at a constant pitch. Moreover, the adjacent 1
Since the distance between the secondary conductor winding 1 and the secondary conductor winding 2 is equal,
It is completely evenly wound. FIG. 3 is a perspective view of the composite member of the second embodiment. As shown in FIG. 3, the second embodiment differs from the first embodiment in that instead of the strip-shaped insulating spacer 3,
3 which has almost the same diameter as the wire diameter of the primary and secondary conductor windings 1 and 2.
Book (generally one or more) rod-shaped insulating spacers 5
Is that it is interposed between the primary conductor winding 1 and the secondary conductor winding 2 and is integrally molded with an adhesive. Therefore, according to the second embodiment, the distance between the primary and secondary conductor windings 1 and 2 can be freely adjusted by selecting the number of insulating spacers 5.

[0011]

According to the present invention, the primary conductor windings and the secondary conductor windings are relatively easily wound alternately while maintaining a fixed positional relationship, and further, the primary conductor windings and the secondary conductor windings are wound. It is also possible for the conductor windings to be alternately and completely evenly wound, or for the spacing between the primary and secondary conductor windings to be variable. Therefore, the capacitance between the primary conductor winding and the secondary conductor winding can be made small and can be adjusted to a desired degree to be small, and electromagnetic coupling between the primary conductor winding and the secondary conductor winding can be achieved. Good and can reduce leakage inductance.
As a result, the common mode noise rejection ratio can be increased, the noise resistance can be improved, and the frequency characteristics can be improved, which is suitable for pulse code communication and data communication using modulation / demodulation.

[Brief description of drawings]

FIG. 1 is a perspective view of a composite member of a first embodiment according to the present invention.

FIG. 2 is a perspective view of the first embodiment.

FIG. 3 is a perspective view of a composite member according to a second embodiment.

FIG. 4 is a sectional view of a conventional example.

FIG. 5 is a perspective view of another conventional example.

[Explanation of symbols]

 1 Primary Conductor Winding 2 Secondary Conductor Winding 3 Insulating Spacer (Strip) 5 Insulating Spacer (Bar) 10 Core (Troidal Core)

Claims (3)

[Claims] 1. A composite member integrally formed by interposing a strip-shaped insulating spacer between a primary conductor winding and a secondary conductor winding, and spirally wound around a ring-shaped magnetic core at a constant pitch. A pulse transformer characterized by: 2. A composite member integrally formed by interposing one or more rod-shaped insulating spacers in a line between a primary conductor winding and a secondary conductor winding in a ring-shaped magnetic core at a constant pitch. A pulse transformer characterized by being wound in a spiral shape. 3. The transformer according to claim 1 or 2, wherein the composite member is wound such that adjacent primary conductor windings and secondary conductor windings have equal intervals. And pulse transformer.