JP2740037B2 - Inverter power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to an inverter power supply device used as a drive power supply for a magnetron of a microwave oven, for example.

(Prior Art) For example, in the case of a microwave oven, in recent years, a high-output inverter power supply has been adopted as a drive power supply for a magnetron to shorten the cooking time and adjust the output according to the type of food and the cooking process. Something like that has been developed.

As shown in FIG. 4, a high-frequency transformer used in such an inverter power supply includes a secondary winding 3 and a primary winding 4 wound vertically around a bobbin 2 on the outer periphery of a ferrite core 1. It is configured to be mounted. Thus, there is a situation in which a high-frequency current flows through the primary winding 4, and a litz wire 5 formed by bundling and twisting a large number of thin enamel wires into the primary winding 4 in order to suppress the skin effect. Was adopted.

(Problems to be Solved by the Invention) However, in the conventional transformer as described above, the litz wire 5 employed in the primary winding 4 has a cable shape having a relatively large diameter. In addition to the drawback that the primary winding 4 is complicated, the space factor of the primary winding 4 is poor and the whole is large.

The transformer is mounted on a board (not shown), and both ends of the primary winding 4 are soldered to the lands of the board. It must be done with the conductor of the enameled wire exposed. For this reason, the soldering work is very troublesome, such as loosening the twist of the end of the litz wire 5 and performing preliminary soldering, peeling off the enamel of the loosened portion, and finally soldering to the land portion. It was done in the procedure.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an inverter power supply device capable of easily performing a soldering operation between a primary winding end of a transformer and a land of a substrate.

[Constitution of the Invention] (Means for Solving the Problems) An inverter power supply device according to the present invention is a high-frequency transformer having a primary winding formed by winding a sheet-like conductor in which insulated thin conductors are arranged in a sheet and joined together. On the substrate, characterized in that the end of the primary winding is soldered to the land portion of the slit hole portion of the substrate in a state of being inserted into the slit hole formed in the substrate. Having.

(Operation) According to the inverter power supply device of the present invention, since the primary winding is formed of the sheet-shaped conductor, the conductor of each conductor can be easily exposed when the tip is soldered to the substrate. . Therefore, the work of soldering is like joining and twisting conductors such as litz wire,
The step of untwisting and the step of pre-soldering are not required, and it is only necessary to insert the leading end of the sheet-shaped conductor into the slit hole and then solder to the land.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIGS. 2 and 3 schematically show a high-frequency transformer 11 according to the present embodiment used for an inverter power supply for driving a magnetron of a microwave oven, for example. The high-frequency transformer 11 has a secondary winding 14 and a primary winding 15 wound around a bobbin 13 made of an insulating material around a ferrite core 12 which is an iron core.
Is configured. The bobbin 13 has a leg 16 at the lower end.
A rectangular base 16 provided with a is integrally formed, and a flange-shaped partitioning wall 13a is integrally formed substantially at the center. The secondary winding 14 made of a single wire is wound on the upper side defined by the partition wall 13a, and the primary winding 15 described later is wound on the lower side. It is supposed to be. Further, the ferrite core 12 has a gap 12a located at the center of the primary winding 15.

The high-frequency transformer 11 is a substrate partially shown in FIG.
The inverter power supply device according to the present embodiment is mounted on the base 17 at the legs 16a and mounted together with various electronic components and the like (not shown in detail). In addition, as shown in FIG.
Slit holes 18 are formed at land portions (not shown) where the primary winding 15 is connected by soldering.

Now, the primary winding 15 will be described.The primary winding 15 is composed of a sheet-shaped conductor 19 in which a large number of insulated thin conducting wires, such as enamel wires, are arranged in a sheet and joined.
The sheet-shaped conductor 19 is wound around the bobbin 13 so as to overlap. The sheet conductor 19 is generally used for wiring of a computer.

Both ends of the primary winding 15 are led downward through the base 16 and soldered while being inserted into the slit holes 18, 18, respectively. This soldering work,
After peeling off the enamel at the end of the primary winding 15 (sheet-shaped conductor 19), the conductor of each enamel wire constituting the sheet-shaped conductor 19 is exposed, and the tip is inserted into the slit hole 18 and then landed. This is performed by a procedure such as soldering to a part.

According to the high-frequency transformer 11 of this embodiment, since the sheet-like conductor 19 composed of a set of insulated thin conductors is employed for the primary winding 15, the skin effect can be suppressed. Then, since the winding operation of the primary winding 15 only needs to be wound so as to overlap the sheet-shaped conductor 19 on the bobbin 13, the cable-shaped litz wire 5 like a conventional one is wound in a coil shape. The work becomes easier than in the case. In addition, since it is possible to wind the enameled wires and the sheet-shaped conductor 19 in an aligned and tightly contacted state with very little space, compared to the case where a relatively thick cable-shaped wire such as the conventional litz wire 5 is used. The space factor can be improved, and the overall size can be reduced.

Further, according to the inverter power supply device of the present embodiment, since the primary winding 15 is constituted by the sheet-shaped conductor 19, when the tip is soldered to the substrate 17, the conductor of each enameled wire can be easily formed. Can be exposed. Therefore, a litz wire 5 obtained by bundling and twisting conventional enamel wires
Unlike the case of soldering the tip of the wire, the step of loosening and the step of preliminary soldering are not required, and as a result, the tip of the sheet-shaped conductor 19 is inserted into the slit hole 18 in the soldering process. After that, it is only necessary to perform soldering to the land portion, and the work becomes extremely easy.

The present invention is not limited to the above embodiment,
The present invention can be appropriately changed and implemented without departing from the gist.

[Effects of the Invention] As is clear from the above description, according to the inverter power supply device of the present invention, the work of soldering the primary winding end of the transformer and the land of the substrate can be easily performed. It has excellent effects.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is an exploded perspective view of an essential part showing an attached state of an end of a primary winding to a substrate, and FIG. 2 is a high-frequency transformer. 3 is a side view of the high-frequency transformer, and FIG. 4 is a diagram corresponding to FIG. 3 showing a conventional example. In the drawing, 11 is a high-frequency transformer, 12 is a ferrite core (iron core), 14 is a secondary winding, 15 is a primary winding, 17 is a substrate, 18 is a slit hole, and 19 is a sheet-shaped conductor.

Claims (1)

(57) [Claims] 1. A high-frequency transformer having a primary winding formed by winding a sheet-shaped conductor in which insulated thin conductive wires are arranged in a sheet shape and joined, and disposed on a substrate.
An inverter power supply device, wherein an end of the primary winding is soldered to a land portion of a slit hole portion of the substrate while being inserted into a slit hole formed in the substrate.