JPH0711453Y2 - Trance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a protrusion on the coil winding surface of a coil bobbin provided with a connection terminal to increase the creepage distance between the coil and the iron core connected to the connection terminal, and The present invention relates to a transformer having improved crossover insulation with a winding end surface of a coil.

[Prior Art] Conventionally, in a transformer for low-voltage conversion of an electronic device such as an AC adapter, a coil bobbin having primary and secondary coils wound around an E or I type iron core is mounted to a primary or secondary coil. Electromagnetic inductive coupling between the secondary coils is performed.

A conventional example of such a transformer is shown in FIG.

In the figure, reference numerals 2 and 3 indicate E and I type iron cores. Furthermore, the primary /
It has a coil bobbin 5 for the secondary coil, a connection terminal portion 6 of the secondary coil, a connection terminal 6a, and a primary coil 8a. It should be noted that the other connecting terminals of the coil end and the center tap end are omitted.

Reference symbol E shown here is a creepage distance related to surface discharge, and reference symbol C is a crossover insulation distance related to the input and output ends of the coil. The connection terminal portion 6 is provided with a protrusion 6b, and the protrusion 6b has an end portion of the coil. Was locked and adjusted.

[Problems to be Solved by the Invention] However, in the above transformer, the connection terminal portion 6
In order to prevent the creeping discharge between the coil wire and the iron core 2 according to the above, if the projection 6a is provided at a high position to further increase the creepage distance E and the projections 6a are further separated, the crossover insulation distance C becomes small,
Further, if the protrusion 6b is provided at a low position in order to improve the crossover insulation, the creepage distance E is reduced, so that there is a drawback that any one of them must be sacrificed.

The present invention has been made in view of the above points, and an object thereof is to provide a transformer capable of improving its characteristics without reducing the creepage distance and the crossover insulation distance.

[Means for Solving the Problems]

A transformer according to the present invention is a transformer including a coil, a coil bobbin around which a coil is wound, a connection terminal that is planted in the coil bobbin and connected to the coil end, and an iron core attached to the coil bobbin. A protrusion is formed on the coil winding surface near the winding start leader line connected to the terminal, for separating the coil in the direction orthogonal to the winding surface.

[Action]

In the transformer configured as described above, the creepage distance and the crossover insulation distance are effectively obtained, and the creeping discharge and the crossover insulation are maintained.

〔Example〕

Hereinafter, embodiments of a transformer according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the overall construction of the embodiment, and FIG. 2 shows A of FIG.
A sectional view taken along the line A and FIG. 3 are sectional views taken along the line BB in FIG.

In FIG. 1, reference numerals 12 and 13 indicate E and I type iron cores. Furthermore,
Coil bobbin 14, primary / secondary coil 15a (secondary coil is not shown), protruding portions 17a, 17b, 17c of coil bobbin 14 and connection terminals 18a, 18 planted in the protruding portions 17a, 17b, 17c.
It has b and 18c. Then, the connection terminals 18a, 18b, 18c
Both ends of the primary coil 15a are connected to. Reference character M is a transformer frame, and the protruding portions 17a, 17b, 17c
The projections 11a, 11 to which both ends of the primary coil 15a are locked.
b and 11c are formed.

Here, the coil winding surface S of the coil bobbin 14 is provided with a protrusion 22 as shown in FIGS. 2 and 3.

In such a case, when the primary coil 15a is wound around the coil bobbin 14, the primary coil 1 having one end fixed to the connection terminal 18a is
The coil bobbin 14 is wound on the surface on which the protruding portion 17a is provided by engaging the protrusion 5a with the projection 21a provided on the protruding portion 17a of the coil bobbin 14 and making one round along the body portion 14b of the winding portion 14a of the coil bobbin 14. Since the projection 22 is provided on the surface in the direction orthogonal to the primary coil, as shown in FIGS. 2 and 3, the coil bobbin 14
The winding surfaces S of the above are spaced apart from each other and are wound. In this way, the primary coil 15a is attached to the coil bobbin 14.
Is wound, the crossover of the creepage distance m between the winding start leader line 15a-1 connected to the connection terminal 18a and the E-shaped iron core 12 and the distance between the winding end surface 15a-2 of the primary coil 15a and Without decreasing the insulation distance n, that is, in order to obtain the creepage distance m, the position of the connection terminal 18a is further separated from the iron core 13, and in this case, the crossover insulation distance n is formed to be an effective interval even if it is arranged higher. Therefore, the creepage distance m and the crossover insulation distance n are respectively formed as desired.

It should be noted that the projection 22 may be formed in any of an inclined shape and a linear shape as long as the winding surface S and the primary coil 15a are separated from each other when the primary coil 15a is wound around the coil bobbin 14. .

This improves creeping discharge and crossover insulation.

[Effect of device]

As described above, in the transformer according to the present invention, the transformer includes the coil, the coil bobbin around which the coil is wound, the connection terminal implanted in the coil bobbin to connect the coil ends, and the iron core mounted on the coil bobbin. At
A protrusion that separates the coil in the direction orthogonal to the winding surface is formed on the coil winding surface near the winding start leader line connected to the connection terminal of the coil bobbin, thereby reducing the creepage distance and crossover insulation distance. However, it has the effect of improving its characteristics.

[Brief description of drawings]

1 is a perspective view showing the overall structure of the transformer of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is B in FIG.
FIG. 4 is a sectional view taken along the line -B, and FIG. 4 is a sectional view showing a conventional example. 12 ... E type iron core, 13 ... I type iron core, 14 ... Coil bobbin, 15a
... primary coil, 15a-1, winding lead wire, 15a-2 ... winding end surface, 18a ... connection terminal, 22 ... protrusion, m ... creepage distance, n ...
Crossover insulation distance, S ... Coil winding surface.

Claims (1)

[Scope of utility model registration request] 1. A transformer comprising a coil, a coil bobbin around which the coil is wound, a connection terminal which is planted in the coil bobbin and connected to the coil end, and an iron core mounted on the coil bobbin. A transformer characterized in that a protrusion is formed on a coil winding surface near a winding start leader line to be connected, the projection separating the coil in a direction orthogonal to the winding surface.