JPH1092658A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer which can be improved in conversion efficiency while the transformer secures a prescribed insulation property. SOLUTION: Steps 2f and 2g are provided on the bottom faces of the terminal pin projecting sections 2b and 2c of a bobbin 2 and lead-out grooves 2d and 2e are nearly horizontally formed on the bottom faces of the sections 2b and 2c so that the grooves 2d and 2e can be communicated with the steps 2f and 2g. The leader lines of a primary coil 3 are nearly horizontally lead out along the grooves 2d and 2e and bound with terminal pins 5 and 6 and an interlayer tape 12 is wound around the outer periphery of the coil 3 so that the broad sections 12a and 12b of the tape 12 can be engaged with the steps 2f and 2g in a state where the sections 12a and 12b of the tape 12 retain the lead wires. The tape 12 is protruded from both the left and right sides of the primary coil 3 and a secondary coil 4 by the length corresponding to the required insulation distance between the coils 3 and 4 at the sections 12a and 12b and from both the left and right sides of the coils 3 and 4 by the length corresponding to the half of the required insulation distance at the other section than the broad sections 12a and 12b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer in which a primary coil and a secondary coil are separated by an interlayer tape.

[0002]

2. Description of the Related Art FIGS. 3A and 3B show an example of a conventional transformer. FIG. 3A is a front view and FIG. 3B is a bottom view. Conventionally, as shown in FIG. 3, a transformer of this type forms a primary coil 3 by winding a conductor around a bobbin 2, coats an outer layer with an interlayer tape 12, and then winds a conductor to form a secondary coil 4.
Is formed.

As shown in FIG. 3A, the interlayer tape 12 has a winding width W2 of the primary coil 3 and the secondary coil 4.
Since it is wider, the necessary insulation distance between the primary coil 3 and the secondary coil 4 is ensured by the interlayer tape 12. Further, since the lead wire of the primary coil 3 passes through the vicinity of the secondary coil 4 and is entangled with the terminal pin 6, a predetermined width W is provided on each of the left and right sides of the primary coil 3 and the secondary coil 4.
3, barrier tapes 7, 8, 9, and 10 were provided to secure a required insulation distance between the lead wire of the primary coil 3 and the secondary coil 4.

[0004]

However, in this case, the winding width W2 of the primary coil 3 and the secondary coil 4 is larger than the bobbin width W1 by an amount corresponding to twice the width of the barrier tapes 7, 8, 9, 10. Since the width of the transformer 1 becomes narrow, a thin conductive wire must be used, and there is a disadvantage that the conversion efficiency (output) of the transformer 1 cannot be improved.

[0005] In view of the above circumstances, an object of the present invention is to provide a transformer capable of improving conversion efficiency while securing predetermined insulation properties.

[0006]

That is, the present invention comprises a bobbin (2) having a winding cylinder (2a) and terminal pin protruding portions (2b, 2c). The terminal pins (5, 6) are protruded from the set portion, the steps (2f, 2g) are provided on the bottom surface of the terminal pin protruded portion of the bobbin, and the extraction groove (2d) is formed on the bottom surface of the terminal pin protruded portion of the bobbin. , 2e) is formed substantially horizontally so as to communicate with the step, and one coil (3) is provided on the outer periphery of the winding cylindrical body of the bobbin, and barrier tapes (7, 8) are provided on both left and right sides thereof. The lead wire of this coil is drawn out in a substantially horizontal direction along the lead groove and entangled with the terminal pin, and an interlayer tape (12) is provided on the outer periphery of the coil with a wide portion (12).
a, 12b) is wound so as to engage with the step so as to press the lead wire of the coil, and the other coil (4) is wrapped around the outer periphery of this interlayer tape, and barrier tapes (9, 10) are respectively wrapped on the left and right sides thereof. A transformer (1) formed in an attached form and having a magnetic core inserted into an inner space of a winding cylinder of the bobbin, wherein the interlayer tape has a wide portion.
Each coil protrudes from both coils on both left and right sides by a length equal to or greater than the required insulation distance between one coil and the other coil, and at a portion other than the wide portion, the required insulation distance is 0.5 to 1 times the required insulation distance. Is formed so as to protrude from both coils on both left and right sides by a length corresponding to.

It should be noted that the numbers in parentheses are for convenience showing the corresponding elements in the drawings, and therefore, the present invention is not limited to the description on the drawings. The same applies to the column of “Claims”.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are views showing an embodiment of a transformer according to the present invention, wherein FIG. 1A is a front view, FIG. 1B is a bottom view, and FIG. 2 is a developed plan view of an interlayer tape constituting the transformer shown in FIG. .

As shown in FIG. 1, a transformer 1 according to the present invention includes a bobbin 2, a primary coil 3, a secondary coil 4, terminal pins 5, 6 and a magnetic core (not shown).

That is, the bobbin 2 has a winding cylinder 2a, and a primary wire is wound around the winding cylinder 2a to form a primary coil 3. Further, barrier tapes 7 and 8 are provided on both left and right sides of the primary coil 3, respectively. The outer circumference of the primary coil 3 and the barrier tapes 7 and 8 are covered with an interlayer tape 12.
As shown in FIG. 2, wide portions 12a and 12b
Is formed in a substantially rectangular shape. Interlayer tape 12
A secondary coil 4 is formed by winding a conductor around the outer periphery of the secondary coil 4. Barrier tapes 9 and 10 are attached to both left and right sides of the secondary coil 4, respectively.

As shown in FIG. 1A, the interlayer tape 12 has a required insulation distance between the primary coil 3 and the secondary coil 4 (for example, 3.m) at the wide portions 12a and 12b.
2 mm), which protrudes from the primary coil 3 and the secondary coil 4 to the left and right sides, and engages with the steps 2f and 2g of the bobbin 2 in a manner to hold down the lead wire of the primary coil 3, while being wide. In parts other than the parts 12a and 12b,
It protrudes from the primary coil 3 and the secondary coil 4 to both left and right sides by a length corresponding to 0.5 times the required insulation distance. The width W3 of each of the barrier tapes 7, 8, 9, and 10 is uniform, and is equal to 0.5 times the required insulation distance.

Terminal pin protruding portions 2b and 2c are provided on both left and right sides of the winding cylinder 2a, respectively, and terminal pins 5 and 6 protrude from the terminal pin protruding portions 2b and 2c, respectively. Have been. Further, on the bottom surface of each terminal pin protruding portion 2b, 2c, a drawing groove 2d, 2e is formed substantially horizontally, and steps 2f, 2g and locking piece 2 are formed.
h, 2i are provided, and the steps 2f, 2g communicate with the extraction grooves 2d, 2e, respectively. A magnetic core (not shown) is inserted into the internal space of the winding cylinder 2a.

Here, the primary coil 3 and the secondary coil 4
Is the width W of the barrier tapes 7, 8, 9, 10.
3, the width W3 of the barrier tapes 7, 8, 9, and 10 is, as described above, the required insulation between the primary coil 3 and the secondary coil 4. Since it is equal to 0.5 times the distance, the width W corresponding to the required insulation distance between the primary coil 3 and the secondary coil 4
3 compared with the case where the barrier tapes 7, 8, 9 and 10 are used (see FIG. 3), the primary coil 3 and the secondary coil 4 are reduced by the half of the width W3 of the barrier tapes 7, 8, 9 and 10. Can be increased. as a result,
The primary coil 3 and the secondary coil 4 can be formed using a thick conducting wire, and the conversion efficiency of the transformer 1 can be improved.

At this time, as described above, the interlayer tape 12 has a length corresponding to at least 0.5 times the required insulation distance between the primary coil 3 and the secondary coil 4 over the entire circumference thereof. And the left and right sides of the primary coil 3 protrude from the secondary coil 4. The primary coil 3 and the secondary coil 4 are separated by a creeping reciprocating distance of the protruding portion of the interlayer tape 12 (that is, a required insulation distance or more). The required insulation distance between the coil and the secondary coil 4 is ensured.

The lead wire of the primary coil 3 is shown in FIG.
As shown in (1), it is pulled out substantially horizontally through the lead groove 2e of the terminal pin protruding portion 2c, is hooked on the locking piece 2i and is entangled with the terminal pin 6, so that the lead wire of the primary coil 3 The secondary coil 4 is a one-way creepage distance of the protruding portions of the wide portions 12a and 12b of the interlayer tape 12 (that is,
(Necessary insulation distance), and the required insulation distance between the lead wire of the primary coil 3 and the secondary coil 4 is also ensured.

In the above embodiment, the transformer 1 in which the primary coil 3 is formed inside the interlayer tape 12 and the secondary coil 4 is formed outside the interlayer tape 12 has been described. It is also possible to apply the present invention to the transformer 1 in which the secondary coil 4 is formed outside the tape 12 and inside the interlayer tape 12.

[0017]

As described above, according to the present invention, the bobbin 2 having the winding cylinder 2a and the terminal pin protruding portions 2b and 2c is provided, and the bobbin 2 has the terminal pin protruding portion 2b. , 2
c, the terminal pins 5 and 6 are protruded, and steps 2f and 2g are provided on the bottom surfaces of the terminal pin protruding portions 2b and 2c of the bobbin 2, and are drawn out on the bottom surfaces of the terminal pin protruding portions 2b and 2c of the bobbin 2. The grooves 2d and 2e are formed substantially horizontally so as to communicate with the steps 2f and 2g, and one coil such as the primary coil 3 is mounted on the outer periphery of the winding cylindrical body of the bobbin 2 on each of the left and right sides of the barrier tape 7 respectively. , 8 are attached, and the lead wire of this coil is pulled out in a substantially horizontal direction along the lead grooves 2d, 2e and entangled with the terminal pins 5, 6, and an interlayer tape 12 is wound around the outer periphery of the coil. The wide portions 12a, 12b
Is held down by the step 2 so as to press the lead wire of the coil.
f, 2g to be engaged with this interlayer tape 1
The other coil, such as the secondary coil 4, is formed on the outer periphery of the coil 2 with barrier tapes 9, 10 attached to the left and right sides thereof, respectively, and a magnetic core is inserted through the internal space of the winding cylinder 2 a of the bobbin 2. 1, the interlayer tape 12 protrudes from the left and right sides of both coils by a length corresponding to the required insulation distance between one coil and the other coil at the wide portions 12a and 12b. , Wide part 12
a and 12b, the required insulation distance of 0.5
Since it is configured to protrude from both coils on both left and right sides by a length corresponding to ~ 1 times, the barrier tape 7,
Even if the width W3 of 8, 9, 10 is reduced, the required insulation distance between one coil and the other coil and between the lead wire of one coil and the other coil can be secured.
Since the winding width W2 of both coils can be increased by that amount, it is possible to improve the conversion efficiency of the transformer 1 while securing a predetermined insulating property.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a transformer according to the present invention, wherein (a) is a front view and (b) is a bottom view.

FIG. 2 is a developed plan view of an interlayer tape constituting the transformer shown in FIG.

FIG. 3 is a diagram showing an example of a conventional transformer, and FIG.
Is a front view, and (b) is a bottom view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transformer 2 ... Bobbin 2a ... Winding cylinder 2b, 2c ... Terminal pin protruding part 2d, 2e ... Extraction groove 2f, 2g ... Step 3 ... One coil (primary coil) 4 ... ... the other coil (secondary coil) 5, 6 ... terminal pin 7, 8, 9, 10 ... barrier tape 12 ... interlayer tape 12a, 12b ... wide part

Claims (1)

[Claims] 1. A winding cylinder (2a) and a terminal pin protruding portion (2).
b, 2c), and a terminal pin (5, 6) protruding from the terminal pin protruding portion of the bobbin, and a step ( 2f, 2
g), and a pull-out groove (2) is formed on the bottom surface of the terminal pin protruding portion of the bobbin.
d, 2e) are formed substantially horizontally so as to communicate with the step, and one coil (3) is attached to the outer periphery of the winding cylindrical body of the bobbin, and barrier tapes (7, 8) are attached to the left and right sides thereof, respectively. The lead wire of this coil is pulled out in a substantially horizontal direction along the lead groove and entangled with the terminal pin. An interlayer tape (12) is provided on the outer periphery of the coil with its wide portions (12a, 12b). Is wound so as to be engaged with the step so as to hold down the lead wire of the coil, and the other coil (4) is attached to the outer periphery of the interlayer tape and barrier tapes (9, 10) are attached to the left and right sides thereof, respectively. A transformer (1), wherein a magnetic core is inserted into an inner space of a winding cylindrical body of the bobbin, wherein the interlayer tape has a required insulation distance between one coil and the other coil in a wide portion thereof. More than The left and right sides from both coils by a length corresponding to the required insulation distance, and the left and right sides from both coils by a length equivalent to 0.5 to 1 times the required insulation distance. A featured transformer.