JP2607841Y2 - Trance - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to home electric appliances, information appliances,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer that ensures electric withstand voltage characteristics of a power supply circuit of an electronic device such as an industrial device and that can be easily assembled. 2. Description of the Related Art In general, a transformer used in a power supply circuit of an electronic device is required to prevent a short circuit between a primary coil and a secondary coil and damage due to dielectric breakdown or the like. It is required to comply with the safety standards of For example, in the Electrical Appliance and Material Control Law of the Japanese standard, if the coil is exposed even if the winding is impregnated with varnish, the space distance between the primary coil and the secondary coil is 2 mm or more, According to UL 1950, the space distance is 3.2 mm or more, and furthermore, the IEC 9
50, the spatial distance is set to 6.4 mm or more. FIG. 3B shows a conventional structure of a transformer of this type which secures a spatial distance for guaranteeing the electrical insulation withstand voltage. Usually, the conventional structure shown in FIG.
3A, a barrier insulating tape 4 shown in FIG. 3A is wound around both ends of the primary coil 6, and then the insulating tape 3 is wound around the primary coil 6. A barrier insulating tape 4 is wound around both ends of the insulating tape 3, the length of the dimension A is adjusted, and a space distance corresponding to a required standard is secured. 4A to 4C, the primary coil 6 and the secondary coil 5 are separated from each other as shown in FIG. 4B. Nakatsuba 2a to provide electrical insulation
Is provided, and the thickness B of the middle collar 2a and the height dimension C from the coil surface of the middle collar, that is, B + 2 between the primary coil and the secondary coil are provided.
The length of × C is important. Therefore, it is necessary to increase the thickness B and the length of the dimension C in order to comply with the normal standard. For this reason, in the case of the conventional coil bobbin structure, as a result, the outer shape becomes large in both the X-axis direction and the Y-axis direction, so that the coil bobbin structure becomes large, and it is difficult to reduce the size of the transformer. There is a drawback that it is difficult to reduce the cost, such as an increase in the number of assembly steps because the tape is wound. An object of the present invention is to provide a small-sized, low-cost coil bobbin transformer which can be adapted to the above-mentioned various safety standards and is easy to assemble. SUMMARY OF THE INVENTION In the present invention, a primary coil and a secondary coil are wound around a magnetic leg of a closed magnetic path formed by butt-combining U-shaped or E-shaped divided magnetic cores. In a transformer for inducing a voltage applied to the primary coil to a secondary coil, a magnetic leg of a split type magnetic core is inserted into a central primary coil bobbin through-hole, and the primary coil is wound around the outer periphery. A primary coil bobbin having a primary coil bobbin portion and having a terminal implanted on one flange; and an opening for inserting and fitting the primary coil bobbin, and a straight line extending through the primary coil bobbin through hole of the primary coil bobbin. Having a secondary coil bobbin through-hole that communicates with the top and inserts the magnetic leg of the magnetic core;
A secondary coil bobbin having a secondary coil bobbin for winding the secondary coil around the secondary coil bobbin through hole, and winding the primary coil bobbin and the secondary coil bobbin And the primary coil bobbin is inserted and fitted into the opening of the secondary coil bobbin, and a split magnetic core is incorporated into the transformer. [0005] That is, the present invention is based on the magnetic leg of the magnetic core.
In a transformer in which a secondary coil and a secondary coil are wound and an induced voltage is generated in the secondary coil by a voltage applied to the primary coil, an inner periphery of a primary coil winding portion for winding the primary coil is provided. A primary coil bobbin through-hole into which the magnetic leg of the magnetic core is inserted, a terminal having a terminal planted at one end of the primary coil winding cylinder, a primary coil bobbin having a flange attached to the other end, A secondary coil bobbin through-hole for communicating with the primary coil bobbin through-hole and inserting a magnetic leg of the magnetic core is provided on an inner periphery of a secondary coil bobbin for winding a secondary coil; A flange having a terminal planted at one end of the portion, an opening for receiving and fitting the primary coil bobbin at the other end, and a peripheral portion of the magnetic core;
A primary coil bobbin, and the primary coil bobbin and
A winding is wound around each of the secondary coil bobbin portions, and the primary coil bobbin is housed in the opening of the secondary coil bobbin in the same direction as the direction in which the terminals of the primary coil bobbin and the secondary coil bobbin are implanted. The magnetic legs of the magnetic core
A transformer characterized in that the primary coil bobbin and the terminal of the secondary coil bobbin are assembled in the primary coil bobbin through-hole and the secondary coil bobbin through-hole substantially perpendicularly to the direction in which the terminals are implanted. The primary coil bobbin in which the primary coil is wound is housed in the secondary coil bobbin in which the secondary coil is wound with the opening for accommodating the primary coil bobbin. The two coils have a two-layer flange thickness that ensures a spatial distance between the primary coil and the secondary coil. The primary coil and the secondary coil are separated from each other and are easily insulated electrically. In addition, since the primary coil is wound around the primary coil bobbin and the primary coil is incorporated into the opening integrally with the secondary coil bobbin, assembly is easy. A coil bobbin forming a transformer according to the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 2 is an external perspective view of the coil bobbin constituting the transformer according to the present invention, as viewed from the lower surface thereof.
Secondary coil bobbin 2 provided with secondary coil winding tube 302, flanges 304 and 305, and opening 31 for accommodating the primary coil
1 and an insulating molded product of the primary coil bobbin 22;
The secondary coil bobbin 21 has a secondary coil winding portion 302 for winding the secondary coil 23 shown in FIG. 1B and an E-shaped split magnetic core 1 made of a magnetic material shown in FIG.
A secondary coil bobbin through hole 300 into which the center magnetic legs a and 1b are inserted and inserted is provided, and a magnetic core peripheral portion 301 for distributing the divided magnetic cores 1a and 1b shown in FIG. The primary coil bobbin 22 corresponds to the primary coil bobbin 22 shown in FIG.
Primary coil bobbin section 331 having primary coil bobbin through-hole 32 for winding secondary coil 24, flanges 332, 333
And a terminal block 36 on which several terminals 34 are implanted. In the transformer according to the embodiment of the present invention, first, the primary coil 24 shown in FIG. 1B is wound around the primary coil bobbin 22 around the outer periphery of the primary coil winding tube part 331. Also, a secondary coil 23 shown in FIG.
Is wound around the outer periphery of the secondary coil winding tube portion 302. afterwards,
The wound primary coil bobbin 22 is fitted into the opening 31 of the secondary coil bobbin, and the magnetic legs of the split magnetic core are inserted and assembled into the primary coil bobbin through-hole 32 and the secondary coil bobbin through-hole 300. To form As described above, in the transformer according to the present invention, the secondary coil 23 is attached to the secondary coil bobbin portion 302 of the secondary coil bobbin 21.
Is wound around the primary coil bobbin 22 and the secondary coil bobbin 21
It is formed only by being housed in the opening 31 of the above. That is, the primary coil 24 and the secondary coil 23 are completely wound separately using a coil bobbin, and the primary coil and the secondary coil are completely separated by a flange. Although the present invention has been described with an example in which the primary coil is housed in the secondary coil bobbin, it is obvious that the bobbin structure for winding the primary coil and the secondary coil may be a transformer having a structure opposite to that of the embodiment of the present invention. It is. As described above, the transformer according to the present invention accommodates the primary coil bobbin in which the primary coil is wound in the secondary coil bobbin in which the secondary coil is wound.
Since the structure is such that the secondary coil and the secondary coil are separated from each other, there is an effect that a sufficient space distance can be secured and various safety standards can be met. Furthermore, since the outer periphery of the primary coil is protected by the coil bobbin separated from the primary coil bobbin, a transformer can be provided that is smaller in size than the conventional one and has a lower component cost when the same spatial distance is maintained. It became.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a transformer according to the present invention, wherein FIG. 1 (a) is an external perspective view and FIG. 1 (b) is a longitudinal sectional view. FIG. 2 is an exploded perspective view of the coil bobbin constituting the transformer according to the present invention shown in FIG. 3A and 3B are views showing a conventional transformer, wherein FIG. 3A is a longitudinal sectional view, FIG. 3B is an external perspective view, and FIG. 3C is an external perspective view of a coil bobbin. 4A and 4B are views showing a conventional transformer, wherein FIG. 4A is an external perspective view, FIG. 4B is a longitudinal sectional view, and FIG. 4C is an external perspective view of a coil bobbin. [Description of Signs] 1a, 1b Split magnetic core 2 Coil bobbin 2a Middle collar 3 Insulating tape 4 Barrier insulating tape 5 Secondary coil 6 Primary coil 21 Secondary coil bobbin 22 Primary coil bobbin 23 Secondary coil 24 Primary coil 300 Secondary coil bobbin through hole 301 Magnetic core peripheral portion 302 Secondary coil winding tube 303 Terminal block 304, 305 Flange 31 Opening 32 Primary coil bobbin through hole 331 Primary coil winding tube 332, 333 Flange 34 Terminal 35 Terminal 36 Terminal block

   ────────────────────────────────────────────────── ─── Continuation of front page       (56) References JP-A-1-238005 (JP, A)                 JP-A-4-181708 (JP, A)                 Actually open 1979-37019 (JP, U)                 Actual opening 1979-119618 (JP, U)                 Actual opening 1979-98529 (JP, U)                 48-68120 (JP, U)                 Shokai 55-17393 (JP, U)

Claims (1)

(57) [Claims for utility model registration] (1) A primary coil and a secondary coil (2) centered on a magnetic leg of a magnetic core.
In a transformer that winds a primary coil and generates an induced voltage in the secondary coil by a voltage applied to the primary coil, the magnetic core is provided on an inner periphery of a primary coil winding part that winds the primary coil. A primary coil bobbin through-hole into which the magnetic leg is inserted, a flange having a terminal planted at one end of the primary coil winding tube portion, and a primary coil bobbin having a flange attached to the other end;
On the inner periphery of a secondary coil winding tube portion for winding the secondary coil,
A secondary coil bobbin through-hole is provided for communicating with the primary coil bobbin through-hole and for inserting a magnetic leg of the magnetic core.
A secondary coil bobbin having a flange with a terminal implanted at one end of the secondary coil winding portion, an opening at the other end for accommodating the primary coil bobbin, and a flange having a circumferential portion of the magnetic core; A winding is wound around each of the primary coil bobbin and the secondary coil bobbin, and the primary coil bobbin is inserted into the opening of the secondary coil bobbin.
The terminals of the primary coil bobbin are housed in the same direction as the direction in which the terminals of the primary coil bobbin are implanted, and the magnetic legs of the magnetic core are inserted into the primary coil bobbin through-hole and the secondary coil bobbin through-hole, and the terminals of the primary coil bobbin and the secondary coil bobbin A transformer characterized by being assembled substantially perpendicularly to the direction of planting.