JPH04282806A - Electrostatic shielding transformer - Google Patents

Abstract

PURPOSE:To provide an inexpensive electrostatic shielding transformer in which plating of a core is not necessary and its manufacture is facilitated. CONSTITUTION:A primary coil wire 2, a secondary coil wire 3 and an electrostatic shielding coil wire 4 are simultaneously wound on a toroidal core 1 so as to interpose the wire 4 for forming an electrostatic shielding coil between the wire 2 for forming a primary coil and the wire 3 for forming a secondary coil thereby to constitute an electrostatic shielding transformer.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to an electrostatic shielding transformer constructed using, for example, a toroidal core.
The present invention relates to an electrostatic shielding transformer in which electrostatic shielding is provided between a primary coil and a secondary coil by an electrostatic shielding coil wire wound simultaneously with a primary coil wire and a secondary coil wire.

0002

[Prior Art] Conventionally, in an electrostatic shielding transformer using a toroidal core, the core itself is plated, and the plated core has a primary coil wire forming a primary coil and a secondary coil wire forming a secondary coil. By winding the coil and further grounding the plated core, electrostatic shielding was achieved between the primary coil and the secondary coil.

0003

[Problems to be Solved by the Invention] However, in the electrostatic shielding transformer using the conventional toroidal core as described above, a process of plating the core is required, which complicates the manufacturing process and increases costs. was there.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrostatic shielding transformer that does not require core plating, is easy to manufacture, and is inexpensive.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an electrostatic shielding device between a primary coil wire forming a primary coil and a secondary coil wire forming a secondary coil. The primary coil wire, the secondary coil wire, and the electrostatic shielding coil wire are simultaneously wound around a core so that an electrostatic shielding coil wire forming a coil is interposed therebetween.

[0006]

[Operation] On the core, an electrostatic shielding coil wire forming an electrostatic shielding coil is interposed between the primary coil wire forming the primary coil and the secondary coil wire forming the secondary coil. However, this electrostatic shielding coil wire provides electrostatic shielding between the primary coil and the secondary coil.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to the drawings.

FIG. 1 shows an embodiment of an electrostatic shielding transformer according to the present invention. In Fig. 1, 1 is a toroidal core, 2 is a primary coil wire forming a primary coil, 3 is a secondary coil wire forming a secondary coil, and 4 is an electrostatic shield forming a coil for electrostatic shielding. The electrostatic shielding coil wire 4 is a coil wire, and one end thereof is grounded.

The primary coil wire 2 forming the primary coil, the secondary coil wire 3 forming the secondary coil, and the electrostatic shielding coil wire 4 forming the electrostatic shielding coil are as shown in FIG. , the toroidal core 1 is arranged such that the electrostatic shielding coil wire 4 is interposed between the primary coil wire 2 and the secondary coil wire 3.
are wound at the same time.

FIG. 3 shows an equivalent circuit when the electrostatic shielding transformer constructed as described above is used in a modem. In FIG. 3, 20 is a primary coil formed by the primary coil wire 2, 30A and 30B are secondary coils formed by the secondary coil wire 3, and 5, 6, and 7 are resistors, and 5V
A power supply voltage of 5V is applied to the center tap of the secondary coil 30A via the resistor 5, and a power supply voltage of 5V is divided by the resistors 6 and 7 and applied to the center tap of the secondary coil 30B. Moreover, 4 is an electrostatic shielding coil wire forming a coil for electrostatic shielding.

In this configuration, the electrostatic shielding coil wire 4 provides electrostatic shielding between the primary coil 20 and the secondary coils 30A and 30B.

[0012] According to such a configuration, electrostatic shielding can be achieved between the primary coil 20 and the secondary coils 30A and 30B without plating the toroidal core 1.

[0013]

As explained above, according to the present invention, an electrostatic shielding coil is formed between the primary coil wire forming the primary coil and the secondary coil wire forming the secondary coil. Since the electrostatic shielding transformer was constructed by simultaneously winding the primary coil wire, secondary coil wire, and electrostatic shielding coil wire around the core so that the electrostatic shielding coil wire was interposed, the core was not plated. , it is possible to provide an electrostatic shielding transformer that can provide electrostatic shielding between the primary coil and the secondary coil, is easy to manufacture, and is inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of an electrostatic shielding transformer of the present invention.

FIG. 2 is a sectional view of essential parts of the electrostatic shielding transformer shown in FIG. 1.

FIG. 3 is an equivalent circuit diagram when the electrostatic shielding transformer shown in FIG. 1 is used in a modem.

[Explanation of symbols]

1 Toroidal core 2 Primary coil wire 3 Secondary coil wire 4 Electrostatic shielding coil wire 5, 6, 7 Resistance

Claims (1)

[Claims] Claim 1: An electrostatic shielding coil wire forming an electrostatic shielding coil is interposed between a primary coil wire forming a primary coil and a secondary coil wire forming a secondary coil. An electrostatic shielding transformer characterized in that the primary coil wire, the secondary coil wire, and the electrostatic shielding coil wire are wound around a core at the same time.