JP2001267019A - Plug and bobbin of transformer and manufacturing method thfrefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable surge absorber with simplified fitting and assembly method, in a power source at time of C2 plug used. SOLUTION: A plug electrode 1a is processed in square shape (3a) into which pins (2a, 2b) are put through. In making a synthetic resin bobbin for a transformer, a pair of plug electrodes 1a, 1b and the bobbin are integrally molded so that tips of the both pins face each other in a hollow formed in the bobbin, where, the opposing pair of pins work as a surge absorber, and moreover, since the plug and the bobbin of the transformer are integrated, compactness and improved strength are realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug and a bobbin of a transformer having a cylindrical electrode typified by a C2 plug and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, among AC plugs to be inserted into a 200 volt power outlet, there is a type having two columnar conductor electrodes (for example, a C2 plug). There is a so-called AC adapter which integrates a transformer for transformer, a rectifier, and a smoothing capacitor, and has a built-in AC plug inserted into a power outlet. This is, for example, the resin on the bottom case of the AC adapter
A columnar plug (hereinafter, referred to as a plug electrode) is embedded and fixed, and the connection between the plug electrode and the primary winding of the transformer for voltage transformation is made by a lead wire.

[0003]

However, in the case where the plug electrode is fixed to the resin of the bottom case of the AC adapter by resin, the primary winding of the transformer and the lead wires are connected manually in the final assembly process. Soldering work is required.
In this operation, if the time for applying heat is too long, the resin is deteriorated, and in some cases, the plug electrode may be uneven, so that a certain quality cannot be obtained. In order to improve cost and commercial value, miniaturization of AC adapters is required. However, it is necessary to take safety measures against noise with a large peak voltage value such as lightning surge. It is difficult to reduce the size.

In addition, in countries where the AC voltage is 200 V, it is necessary to use a double covered wire as a lead wire for connecting the conductor bar of the AC plug to the transformer from the viewpoint of safety. However, this wire has a thin core wire and is easy to break when a semicircle is formed. Also, since the outer diameter of the lead wire including the coating is relatively large,
When assembling the transformer into the AC adapter case, the transformer is easily bitten, which causes a problem in the manufacturing operation.

An object of the present invention is to provide a bobbin for a plug and a transformer and a method for manufacturing the plug and transformer, which can simplify the mounting work and the assembling work and realize the miniaturization while ensuring the safety against lightning surge and the like. With the goal.

[0006]

According to the present invention, a pin is penetrated through a root portion of a plug electrode to form a synthetic resin bobbin of a transformer for voltage transformation. The pin was formed integrally, and the tips of the pins fixed to both plug electrodes face each other in the cavity formed in the bobbin.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a pair of cylindrical plug electrodes, and a pair of pins each penetrating the root of the cylindrical plug electrode. The cylindrical plug electrodes are arranged in parallel with one end facing each other, whereby the pair of pins facing each other acts as a surge absorber, and is used for noise with a large peak voltage value. Safety can be ensured, and downsizing can be realized.

According to a second aspect of the present invention, there is provided a pair of cylindrical plug electrodes each having a square-shaped portion formed on the root side, and a pair of pins each penetrating the square-shaped portion of the cylindrical plug electrode. The cylindrical plug electrodes are arranged in parallel with one end of the pair of pins facing each other, and the rectangular processing portion of the cylindrical plug electrode is buried in a synthetic resin forming a bobbin of the transformer, and the pair of pins inside the bobbin is formed. The pin has a structure in which a cavity is formed in the part where the pin opposes, so that a pair of opposing pins function as a surge absorber and the root side is processed into a square shape, so the strength in the molded state is increased. Can be improved.

According to a fourth aspect of the present invention, there is provided a pair of cylindrical plug electrodes having a square-shaped portion formed on the root side, and a pair of pins each penetrating the square-shaped portion of the cylindrical plug electrode. The rectangular shaped portion of the cylindrical plug electrode is buried in a synthetic resin forming a bobbin, and one end of the pair of pins is opposed in a cavity provided in the bobbin. The pair of pins function as a surge absorber, and the plug and the bobbin of the transformer are integrated, so that downsizing can be realized.

(Embodiment 1) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a view showing the structure of the plug of the present invention. In FIG. 1, reference numerals 1a and 1b denote conductor rods serving as electrodes of a C2 plug, which are hereinafter referred to as plug electrodes.

Reference numerals 2a, 2b and 2c, 2d denote pins penetrating the plug electrodes, respectively. The pins 2a and 2b are integral with each other, penetrate the end of the plug electrode 1a, and
2d is also integral and penetrates the end of the plug electrode 1b.

FIG. 2 shows the structure of the end of the plug electrode 1a. The plug electrode 1b has the same configuration. In FIG.
Reference numeral 3a denotes a square-formed portion formed at the root of the plug electrode 1a. A square portion 3b is also formed in a portion serving as a root of the other plug electrode 1b. Reference numerals 4a and 4b denote through holes provided in the square processing portions 3a and 3b. The pins 2a and 2b are fitted into the through holes 4a. Pin 2
c and 2d are fitted into the through holes 4b of the other plug electrode 1b.

FIG. 3 is a circuit diagram of an AC adapter integrated with a plug electrode according to an embodiment of the present invention. FIG.
, 5a and 5b are a pair of primary terminals to which the plug electrodes 1a and 1b are connected. 6 is the primary terminal 5
This is a surge absorber provided between a and 5b. 7 is a transformer for transformation, 8 is a rectifier, and 9 is a smoothing capacitor. 10a and 10b are output terminals on the secondary side. The AC adapter configured as described above converts an AC voltage of 220 V to 240 V into a DC voltage by the transformer 7 for transformer, the rectifier 8, and the smoothing capacitor 9.

FIG. 4 shows a mounting structure diagram when the C2 plug of the present invention is used for an AC adapter. In FIG. 4, 1
Reference numeral 4 denotes a bobbin made of a synthetic resin, which is a part of the transformer 7 for voltage transformation.

The bobbin 14 and the transformer 7 are made as follows. First, the pins 2a and 2b are fixed to the plug electrode 1a in the previous step, and the pins 2a and 2b are fixed to the plug electrode 1b.
c and 2d are fixed. When the bobbin 14 is formed by molding, a cavity is formed in a groove for mounting the plug electrodes 1a and 1b, and in a portion where the ends of the pins 2b and 2c face each other. Then, the plug electrodes 1a and 1b are
The two pins are fitted into grooves formed in the bobbin 14 with one ends of the pins facing each other. Pin 2b and pin 2c
Are in an opposed state in the cavity.

When the bobbin 14 is formed by molding, the plug electrodes 1a and 1b may be fixed to a mold and integrally molded. That is, when the pins are fixed to the plug electrodes 1a and 1b and the bobbin 14 is formed by molding,
The plug electrodes 1a and 1b are previously placed in parallel at predetermined positions of the mold so that the portion where the pins are mounted is wrapped in resin. At this time, the pins 2b and 2c are placed with their ends facing each other. In this state, a synthetic resin serving as the material of the bobbin 14 is injected into the mold, whereby the synthetic resin molds the root portions including the squared portions of the plug electrodes 1a and 1b, and the bobbin 14 is integrated with the plug electrode. The mold is taken out of the mold in the state of being held.

In the winding step, the bobbin 14 is fixed to a winding machine, a wire for a primary winding coil is wound, and the end of this wire is wound around the end of a pin and fixed. For example, one wire end is fixed to the pin 2a on the plug electrode 1a side, and the other wire end is fixed to the pin 2d on the plug electrode 1b side. Further, a wire for a secondary winding coil is wound by a winding machine. The transformer 7 for transformer completed in this way is the bobbin 1
4, the base portions of the plug electrodes 1a and 1b are buried. In FIG. 4, reference numeral 15 denotes a transformer 7 for voltage transformation.
, 16 is a primary winding, and 17 is a secondary winding.

The surge absorber 6 has one plug electrode 1a.
This is realized by making the tip of the pin 2b penetrating the other plug electrode 1b face the tip of the pin 2c penetrating the other plug electrode 1b. The pin 2b, which is also a surge absorber, and the plug electrode 1a are electrically connected to each other, and the pin 2c and the plug electrode 1b are also electrically connected. The gap G between the tips of the pins 2b and 2c is appropriately spaced so that discharge can occur between the pins 2b and 2c when a surge voltage of several kv is input.

Reference numeral 12 denotes a hollow cavity formed in the bobbin 14 so as to enable discharge between the pins 2b and 2c.
In addition, the surge absorber 6 connected in this way is usually 22
When a surge voltage of several kV is input due to, for example, lightning, no discharge occurs at an AC voltage of 0 V to 240 V.
Discharge occurs at b and 2c.

[0021]

As described above, the present invention comprises a pair of pins penetrating the root of the plug electrode, and a pair of pins each penetrating the root of the cylindrical plug electrode, and one end of the pair of pins. The pair of pins facing each other acts as a surge absorber by making the synthetic resin mold the base of the cylindrical plug electrode with the parts facing each other. Safety can be ensured. In addition, when the synthetic resin bobbin of the transformer for voltage transformation is made, the bottom part of the pair of plug electrodes is embedded and the bobbin and the plug electrode are integrally molded, so that downsizing can be realized. Simplification and improvement in strength against dropping and the like can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a plug according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an end portion of a plug electrode used for the plug in the embodiment.

FIG. 3 is an AC in which the plug according to the embodiment is integrated;
Adapter schematic

FIG. 4 is a mounting structure diagram when the plug in the embodiment is used for an AC adapter.

[Explanation of symbols]

 1a, 1b Plug electrode 2a, 2b, 2c, 2d Pin 3a, 3b Square machined portion 4a, 4b Through hole 5a, 5b Primary terminal 6 Surge absorber 7 Transformer for transformer 8 Rectifier 9 Smoothing capacitor 10a, 10b Output terminal 12 Cavity 13a, 13b Plug electrode 14 Bobbin 15 Field iron core 16 Primary winding 17 Secondary winding

Continuing on the front page (72) Inventor Zhang Rongsheng Korea 167-3 Wolho-dong, Gyeongbuk-si, Gumi, Gyeongbuk-si F-term (reference) 5E021 FA03 FA14 FB21 FC19 FC32 FC40 LA30 MA05 MA09 MA17 MA18 MB03 5E087 EE02 EE07 FF04

Claims (7)

[Claims] 1. A cylindrical plug comprising: a pair of cylindrical plug electrodes; and a pair of pins each penetrating a root portion of the cylindrical plug electrode, wherein the cylindrical plug has one end of the pair of pins facing each other. A plug wherein electrodes are arranged in parallel. 2. A pair of cylindrical plug electrodes each having a square-shaped portion formed on a root side, and a pair of pins each penetrating through the square-shaped portion of the cylindrical plug electrode, and one end of the pair of pins. The cylindrical plug electrodes are arranged in parallel in a state where they are opposed to each other, and the grooves formed in the synthetic resin are filled with the square processed portions of the cylindrical plug electrodes, and the pair of pins inside the bobbin of the synthetic resin are opposed to each other. A plug characterized by forming a cavity in a part. 3. A pair of cylindrical plug electrodes each having a square processed portion formed on a root side, and a pair of pins each penetrating through the square processed portion of the cylindrical plug electrode, and one end of the pair of pins. The cylindrical plug electrodes were arranged in parallel in a state where they were opposed to each other, and synthetic resin was used to mold a square-shaped portion of the cylindrical plug electrodes, and a cavity was formed in a portion where the pair of pins of the synthetic resin faced each other. A plug characterized in that: 4. A synthetic resin forming a bobbin, comprising: a pair of cylindrical plug electrodes each having a square processed portion formed on a root side; and a pair of pins each penetrating through the square processed portion of the cylindrical plug electrode. A bobbin for a transformer, wherein a square-formed portion of a columnar plug electrode is filled, and one end of the pair of pins is opposed in a cavity provided in the bobbin. 5. A synthetic resin forming a bobbin, comprising: a pair of cylindrical plug electrodes having a square processed portion on the root side; and a pair of pins each penetrating through the square processed portion of the cylindrical plug electrode. A bobbin for a transformer, wherein a square processed portion of a columnar plug electrode is molded, and one end of the pair of pins faces each other in a cavity formed in the bobbin. 6. A square-shaped portion is formed on the root side of the cylindrical plug electrode, and a pin is penetrated through the square-shaped portion of the cylindrical plug electrode, and a pair of cylindrical plug electrodes are formed in parallel with each other. A method of manufacturing a bobbin, wherein one end of the bobbin is fitted into a groove formed in a bobbin of a transformer with the ends facing each other. 7. A square-shaped portion is formed on the root side of the cylindrical plug electrode, and a pin is penetrated through the square-shaped portion of the cylindrical plug electrode. Place one end part at a predetermined position of the bobbin molding die in a state where they face each other, inject a synthetic resin to be a material of the bobbin into the bobbin molding die, and remove a root portion of the cylindrical plug electrode. A method of manufacturing a bobbin, characterized by molding with a synthetic resin.